subject:(Laser assisted in situ keratomileusis)

1. Medeiros, Fabricio Witzel de. Alterações biomecânicas da córnea de suínos induzidas pela confecções de lamelas pediculadas de diferentes espessuras por laser de femtossegundo.

Degree: PhD, Oftalmologia, 2011, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/5/5149/tde-22082011-123320/ ;

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Objetivo: Investigar as alterações biomecânicas da córnea de suínos induzidas pela confecção de lamelas pediculadas de diferentes espessuras pelo laser de femtossegundo. Métodos: Para a… (more)

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Objetivo: Investigar as alterações biomecânicas da córnea de suínos induzidas pela confecção de lamelas pediculadas de diferentes espessuras pelo laser de femtossegundo. Métodos: Para a formação dos dois grupos, 12 olhos de porcos foram usados: lamelas pediculadas de 100 e de 300 micrômetros confeccionadas pelo laser de femtossegundo. Cada olho foi submetido aos seguintes exames, antes da criação das lamelas: topografia por rasterstereography, Ocular Response Analyzer (ORA), tomografia do segmento anterior por coerência óptica para a avaliação paquimétrica corneal e das lamelas criadas e sistema de velocidade de onda (SVO), que mede a velocidade de propagação de ondas acústicas entre dois transdutores posicionados na superfície corneal antes e imediatamente, após a feitura da lamela. O primerio passo foi desenhado para o estudo das diferenças em relação à histerese corneal, fator de resistência corneal, mudanças na curvatura e velocidade de propagação de onda acústica entre córneas com lamelas finas e espessas. Posteriormente, as lamelas foram amputadas, e as medidas do sistema de velocidade de onda foram repetidas. Resultados: A média de espessura das lamelas ± desviopadrão (DP) foi de 108,5±6,9 (8,5% da espessura total) e 307,8±11,5 m (22,9% da espessura total), para os grupos de lamelas finas e espessas, respectivamente (p< 0,001). Histerese corneal e o fator de resistência corneal não apresentaram diferença estatística, após a criação de lamelas finas (p = 0,81 e p = 0,62, respectivamente). Histerese corneal foi significantemente mais baixa, depois da confecção de lamelas mais espessas (8,0±1,0 para 5,1±1,5 mmHg para medidas pré e pós-operatórias, respectivamente, p = 0,003, diminuição de 36,25%) e fator de resistência corneal também mostrou significante diminuição nesse grupo, após o procedimento cirúrgico; valores médios pré e pós-operatórios de 8,2±1,6 e 4,1±2,5 mmHg respectivamente (p= 0,007), diminuição de 50%. A ceratometria média simulada apresentou maiores valores, após a confecção das lamelas mais espessas em relação ao pré-operatório (ceratometria pré e pós-operatória de 39,5±1 D e 45,9±1,2 D, respectivamente, p= 0,003). Para o grupo de lamelas finas, não houve diferença estatisticamente significante (ceratometria pré e pós-operatória de 40,6±0,6 D e 41,4±1,0 D, respectivamente, p=0,55). Em relação ao Sistema de Velocidade de Onda, após a criação das lamelas e sua amputação, houve diminuição da velocidade de propagação acústica, embora na maior parte das posições não fosse estatisticamente significante. Conclusão: Nas condições experimentais estabelecidas por este estudo, a criação de lamelas de maior espessura pareceu exercer efeito mais relevante sobre a biomecânica da córnea de suínos

Purpose: To study the impact of programmed flaps at two different thicknesses on the biomechanical properties of the swine corneas. Methods: Twelve pig eyes were enrolled in this study and were formed two groups: 100m and 300 m flaps performed with the femtosecond laser. Each eye had the following procedure before…

Advisors/Committee Members: Alves, Milton Ruiz.

Subjects/Keywords: Biomecânica; Biomechanics; Ceratomileuse assistida por excimer laser in situ; Cirurgia refrativa; Cornea; Córnea; Corneal topography; Ectasia; Ectasia; Flaps; Histerese; Histeresis; Lamelas pediculadas; Laser-assisted in situ keratomileusis; Pachymetry; Paquimetria; Refractive surgery; Topografia da córnea

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Medeiros, F. W. d. (2011). Alterações biomecânicas da córnea de suínos induzidas pela confecções de lamelas pediculadas de diferentes espessuras por laser de femtossegundo. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/5/5149/tde-22082011-123320/ ;

Chicago Manual of Style (16^th Edition):

Medeiros, Fabricio Witzel de. “Alterações biomecânicas da córnea de suínos induzidas pela confecções de lamelas pediculadas de diferentes espessuras por laser de femtossegundo.” 2011. Doctoral Dissertation, University of São Paulo. Accessed January 24, 2021. http://www.teses.usp.br/teses/disponiveis/5/5149/tde-22082011-123320/ ;.

MLA Handbook (7^th Edition):

Medeiros, Fabricio Witzel de. “Alterações biomecânicas da córnea de suínos induzidas pela confecções de lamelas pediculadas de diferentes espessuras por laser de femtossegundo.” 2011. Web. 24 Jan 2021.

Vancouver:

Medeiros FWd. Alterações biomecânicas da córnea de suínos induzidas pela confecções de lamelas pediculadas de diferentes espessuras por laser de femtossegundo. [Internet] [Doctoral dissertation]. University of São Paulo; 2011. [cited 2021 Jan 24]. Available from: http://www.teses.usp.br/teses/disponiveis/5/5149/tde-22082011-123320/ ;.

Council of Science Editors:

Medeiros FWd. Alterações biomecânicas da córnea de suínos induzidas pela confecções de lamelas pediculadas de diferentes espessuras por laser de femtossegundo. [Doctoral Dissertation]. University of São Paulo; 2011. Available from: http://www.teses.usp.br/teses/disponiveis/5/5149/tde-22082011-123320/ ;

University of New South Wales

2. Feltham, Mark Hayes. Factors which affect refractive outcome following LASIK for myopia.

Degree: Optometry and Vision Science, 2004, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/20800 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:684/SOURCE1?view=true

► Purpose: To improve the predictability, accuracy and stability of laser in-situ keratomileusis(LASIK), by evaluating the clinical, procedural and tissue response factors that affect refractiveoutcomes.Methods: Myopic… (more)

▼ Purpose: To improve the predictability, accuracy and stability of laser in-situ keratomileusis(LASIK), by evaluating the clinical, procedural and tissue response factors that affect refractiveoutcomes.Methods: Myopic LASIK surgeries (n=5,978) were carried out using the Technolas planoscanand Nidek EC-5000 excimer lasers. Clinical variables associated with a refractive outcome ofwithin ±0.50 D of the target were identified using regression analysis. Possible proceduralvariations such as the timing of the procedure and accuracy of both the chosen keratome andexcimer laser were evaluated. The predictability and accuracy of the ablation was assessed bymeasuring changes in corneal thickness during and after the procedure. Factors influencing thestability of refractive outcome were assessed.Results: Clinical factors associated with a refractive outcome of within ±0.50 D of the targetincluded; corrections less than 5.00 DS (OR 0.21x, 95% CI 0.11-0.40x compared withcorrections over -5.00 DS[referent]), patients younger than 40 years (patients over 50 OR 8.27x,95% CI 3.41-20.03x, patients 40 to 50 years OR 1.93x, 95% CI 0.96-3.90x, compared withpatients under 40[referent]) and average pre-operative curvatures between 43.50 and 45.50D(OR 0.39x, 95% CI 0.18-0.83 compared with curvatures of less than 43.50D [referent]).Refractive stability was improved using optic zone sizes between 5.5-6.0 mm, reduced myopiccorrections, flatter pre-operative corneal curvatures and thicker corneal flaps (R²=25%,p&lt0.001).Procedural factors associated with poorer outcomes included: thinner measured flap thickness,deeper ablations and the use of the automated corneal shaper (ACS) microkeratome with anovice surgical team (R²=34%, p &lt 0.001). Delaying the ablation from 20 to 90 seconds (s) afterflap lift was associated with a more stable refractive outcome at three months (p=0.017).In the 90 s following flap lift, the cornea thinned by 5±3%. The ablation rate per scan variedbetween procedures, however, the effect on refractive outcome was small (r=0.15, p=0.267).Changes in central corneal thickness indicated refractive stability (p=0.039).Conclusions: Applying the optimal clinical and procedural factors as described afforded arefractive outcome in a further 8% of cases, resulting in 94% to 96% of cases within ±0.50 DSof target. Refractive predictability was limited due to the inability of the keratome to produce aconsistent corneal flap thickness and unexpected changes in corneal thickness. The accuracy ofrefractive outcome will decrease with larger ablations. The degree of refractive inaccuracy with high refractive corrections (&gt -10.00 D) can be over 1.00 D.

Subjects/Keywords: LASIK (Eye surgery); Myopia; Eye; Refractive errors; laser in-situ keratomileusis; Eye surgery

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APA (6^th Edition):

Feltham, M. H. (2004). Factors which affect refractive outcome following LASIK for myopia. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/20800 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:684/SOURCE1?view=true

Chicago Manual of Style (16^th Edition):

Feltham, Mark Hayes. “Factors which affect refractive outcome following LASIK for myopia.” 2004. Doctoral Dissertation, University of New South Wales. Accessed January 24, 2021. http://handle.unsw.edu.au/1959.4/20800 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:684/SOURCE1?view=true.

MLA Handbook (7^th Edition):

Feltham, Mark Hayes. “Factors which affect refractive outcome following LASIK for myopia.” 2004. Web. 24 Jan 2021.

Vancouver:

Feltham MH. Factors which affect refractive outcome following LASIK for myopia. [Internet] [Doctoral dissertation]. University of New South Wales; 2004. [cited 2021 Jan 24]. Available from: http://handle.unsw.edu.au/1959.4/20800 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:684/SOURCE1?view=true.

Council of Science Editors:

Feltham MH. Factors which affect refractive outcome following LASIK for myopia. [Doctoral Dissertation]. University of New South Wales; 2004. Available from: http://handle.unsw.edu.au/1959.4/20800 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:684/SOURCE1?view=true

Delft University of Technology

3. Choudhary, Abhas (author). Thermal deconsolidation of thermoplastic prepreg tapes during Laser-Assisted Fiber Placement.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:d363b989-f29a-467f-a0dd-dc5e62680546

► The automation of thermoplastic composite production and the drive towards out-of-autoclave processes, is of great relevance in the aerospace and lightweight composite structures industry. Hence,… (more)

▼ The automation of thermoplastic composite production and the drive towards out-of-autoclave processes, is of great relevance in the aerospace and lightweight composite structures industry. Hence, there is a crucial need for developing the current state of material and process understanding, in order to increase the technology readiness levels of automated, out-of-autoclave production processes. Laser assisted fiber placement (LAFP) is a well-researched, automated production process which has been used in developing various thermoplastic composite demonstrators. Theoretically, this process does not require an autoclave consolidation cycle. However, one of the remaining challenge in the process, is the relatively high void content in the produced laminates (>1%). This high void content is impeding the development of thermoplastic composite structures with mechanical strength comparable to structures produced through traditional processing techniques, such as an autoclave. One of the main reasons for the remaining void content in the laminates after consolidation by the roller, is thermal deconsolidation during the rapid heating phase of the process. This is a very less researched aspect of LAFP, due to which, not much is known about the changes that the incoming material undergoes, due to the rapid laser heating and which mechanisms govern these changes. Due to this, thermal deconsolidation is also not included in predictive models for the process and hence the accuracy of these models in predicting the final part quality is poor. Therefore, this research focuses on gaining a better understanding of thermal deconsolidation, in the context of rapid laser heating during LAFP, through experimental investigation.The influence of five process variables was studied in this work: heating time, heated spot length, cooling rate, nip point temperature and the polymer type in carbon-fiber reinforced thermoplastic pre-impregnated (prepreg) tapes. The deconsolidated state of prepreg tape specimens was captured after rapid laser heating and the changes were characterized. The main results revealed that thermal deconsolidation due to rapid laser heating is governed by multiple mechanisms. Some previously unreported and non-intuitive results were observed in the material response to rapid laser heating, which are suspected to have a strong influence on the quality of the laminates produced through LAFP. Based on a qualitative and quantitative study of the influence of studied process variables on thermal deconsolidation, some mechanisms were identified and later verified with confirmatory experiments. The results of this study can be used as a starting point to develop predictive models for estimating the deconsolidated state of thermoplastic prepreg tapes, at the end of the rapid heating phase, in future work. Various topics for further research prevail. These include but are not limited to: studying the influence of tool temperature on the deconsolidation response of the prepreg material, evaluation of the deconsolidated state… Advisors/Committee Members: Teuwen, Julie (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: Thermoplastic; Prepreg; Deconsolidation; Laser Assisted Fiber Placement (LAFP); In-situ consolidation; Out-of-autoclave

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APA (6^th Edition):

Choudhary, A. (. (2019). Thermal deconsolidation of thermoplastic prepreg tapes during Laser-Assisted Fiber Placement. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d363b989-f29a-467f-a0dd-dc5e62680546

Chicago Manual of Style (16^th Edition):

Choudhary, Abhas (author). “Thermal deconsolidation of thermoplastic prepreg tapes during Laser-Assisted Fiber Placement.” 2019. Masters Thesis, Delft University of Technology. Accessed January 24, 2021. http://resolver.tudelft.nl/uuid:d363b989-f29a-467f-a0dd-dc5e62680546.

MLA Handbook (7^th Edition):

Choudhary, Abhas (author). “Thermal deconsolidation of thermoplastic prepreg tapes during Laser-Assisted Fiber Placement.” 2019. Web. 24 Jan 2021.

Vancouver:

Choudhary A(. Thermal deconsolidation of thermoplastic prepreg tapes during Laser-Assisted Fiber Placement. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Jan 24]. Available from: http://resolver.tudelft.nl/uuid:d363b989-f29a-467f-a0dd-dc5e62680546.

Council of Science Editors:

Choudhary A(. Thermal deconsolidation of thermoplastic prepreg tapes during Laser-Assisted Fiber Placement. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:d363b989-f29a-467f-a0dd-dc5e62680546

4. Καλυβιανάκη, Μαρία. Ανάπτυξη και μελέτη μιας νέας μεθόδου διαθλαστικής χειρουργικής (Subepithelial LASIK ή Epi-LASIK) και εφαρμογή της για τη διόρθωση χαμηλής και μέσης μυωπίας.

Degree: 2006, University of Crete (UOC); Πανεπιστήμιο Κρήτης

URL: http://hdl.handle.net/10442/hedi/15709

Subjects/Keywords: Διαθλαστική χειρουργική; Επιφανειακή φωτοεκτομή; Μηχανικός διαχωρισμός επιθηλιακού κρημνού; Μυωπία, χαμηλή; Μυωπία, μέση; Επανατοποθέτηση κρημνού; Βασική μεμβράνη επιθηλίου; Αισθητικότητα κερατοειδούς; Photorefractive keratectomy; Laser in situ keratomileusis; Epi-LASIK; Subepithelial LASIK; Epikeratome

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APA (6^th Edition):

Καλυβιανάκη, . �. (2006). Ανάπτυξη και μελέτη μιας νέας μεθόδου διαθλαστικής χειρουργικής (Subepithelial LASIK ή Epi-LASIK) και εφαρμογή της για τη διόρθωση χαμηλής και μέσης μυωπίας. (Thesis). University of Crete (UOC); Πανεπιστήμιο Κρήτης. Retrieved from http://hdl.handle.net/10442/hedi/15709

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Καλυβιανάκη, Μαρία. “Ανάπτυξη και μελέτη μιας νέας μεθόδου διαθλαστικής χειρουργικής (Subepithelial LASIK ή Epi-LASIK) και εφαρμογή της για τη διόρθωση χαμηλής και μέσης μυωπίας.” 2006. Thesis, University of Crete (UOC); Πανεπιστήμιο Κρήτης. Accessed January 24, 2021. http://hdl.handle.net/10442/hedi/15709.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Καλυβιανάκη, Μαρία. “Ανάπτυξη και μελέτη μιας νέας μεθόδου διαθλαστικής χειρουργικής (Subepithelial LASIK ή Epi-LASIK) και εφαρμογή της για τη διόρθωση χαμηλής και μέσης μυωπίας.” 2006. Web. 24 Jan 2021.

Vancouver:

Καλυβιανάκη �. Ανάπτυξη και μελέτη μιας νέας μεθόδου διαθλαστικής χειρουργικής (Subepithelial LASIK ή Epi-LASIK) και εφαρμογή της για τη διόρθωση χαμηλής και μέσης μυωπίας. [Internet] [Thesis]. University of Crete (UOC); Πανεπιστήμιο Κρήτης; 2006. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10442/hedi/15709.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Καλυβιανάκη �. Ανάπτυξη και μελέτη μιας νέας μεθόδου διαθλαστικής χειρουργικής (Subepithelial LASIK ή Epi-LASIK) και εφαρμογή της για τη διόρθωση χαμηλής και μέσης μυωπίας. [Thesis]. University of Crete (UOC); Πανεπιστήμιο Κρήτης; 2006. Available from: http://hdl.handle.net/10442/hedi/15709

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Queensland University of Technology

5. Albietz, Julie Maree. The conjunctiva in dry eye : histological changes, inflammation, topical treatments, contact lenses and refractive surgery.

Degree: 1999, Queensland University of Technology

URL: http://eprints.qut.edu.au/36745/

Subjects/Keywords: Conjunctiva Diseases; Lacrimal apparatus Diseases; Dry eye syndrome; thesis; doctoral; dry eye; aqueous tear deficiency; lipid anomaly; lid surfacing anomaly; conjunctival epithelium; ocular surface; allergy; toxicity; benzalkonium chloride; inflammation; immunology; conjunctival squamous metaplasia; goblet cell density; contact lenses; eximer keratorefractive surgery; photorefractive keratectomy; laser in situ keratomileusis

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APA (6^th Edition):

Albietz, J. M. (1999). The conjunctiva in dry eye : histological changes, inflammation, topical treatments, contact lenses and refractive surgery. (Thesis). Queensland University of Technology. Retrieved from http://eprints.qut.edu.au/36745/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Albietz, Julie Maree. “The conjunctiva in dry eye : histological changes, inflammation, topical treatments, contact lenses and refractive surgery.” 1999. Thesis, Queensland University of Technology. Accessed January 24, 2021. http://eprints.qut.edu.au/36745/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Albietz, Julie Maree. “The conjunctiva in dry eye : histological changes, inflammation, topical treatments, contact lenses and refractive surgery.” 1999. Web. 24 Jan 2021.

Vancouver:

Albietz JM. The conjunctiva in dry eye : histological changes, inflammation, topical treatments, contact lenses and refractive surgery. [Internet] [Thesis]. Queensland University of Technology; 1999. [cited 2021 Jan 24]. Available from: http://eprints.qut.edu.au/36745/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Albietz JM. The conjunctiva in dry eye : histological changes, inflammation, topical treatments, contact lenses and refractive surgery. [Thesis]. Queensland University of Technology; 1999. Available from: http://eprints.qut.edu.au/36745/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Univerzitet u Beogradu

6. Perović, Ivana. 1984-. Uticaj primene jonskih aktivatora na bazi d-metala Zn, Co, Cu, Ni, Mo i laserskog zračenja na energetsku efikasnost procesa dobijanja vodonika alkalnom elektrolizom.

Degree: Fakultet za fizičku hemiju, 2018, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:18989/bdef:Content/get

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Fizička hemija - Elektrohemija / Physical chemistry - Electrochemistry

Rast životnog standarda sve brže rastuće svetske populacije zahteva veliki napredak u snabdevanju energijom i povećanom… (more)

Subjects/Keywords: hydrogen; energy efficiency; alkaline electrolysis; in situ activation; laser radiation; green laser

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APA (6^th Edition):

Perović, I. 1. (2018). Uticaj primene jonskih aktivatora na bazi d-metala Zn, Co, Cu, Ni, Mo i laserskog zračenja na energetsku efikasnost procesa dobijanja vodonika alkalnom elektrolizom. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:18989/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Perović, Ivana 1984-. “Uticaj primene jonskih aktivatora na bazi d-metala Zn, Co, Cu, Ni, Mo i laserskog zračenja na energetsku efikasnost procesa dobijanja vodonika alkalnom elektrolizom.” 2018. Thesis, Univerzitet u Beogradu. Accessed January 24, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:18989/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Perović, Ivana 1984-. “Uticaj primene jonskih aktivatora na bazi d-metala Zn, Co, Cu, Ni, Mo i laserskog zračenja na energetsku efikasnost procesa dobijanja vodonika alkalnom elektrolizom.” 2018. Web. 24 Jan 2021.

Vancouver:

Perović I1. Uticaj primene jonskih aktivatora na bazi d-metala Zn, Co, Cu, Ni, Mo i laserskog zračenja na energetsku efikasnost procesa dobijanja vodonika alkalnom elektrolizom. [Internet] [Thesis]. Univerzitet u Beogradu; 2018. [cited 2021 Jan 24]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:18989/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Perović I1. Uticaj primene jonskih aktivatora na bazi d-metala Zn, Co, Cu, Ni, Mo i laserskog zračenja na energetsku efikasnost procesa dobijanja vodonika alkalnom elektrolizom. [Thesis]. Univerzitet u Beogradu; 2018. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:18989/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Minnesota

7. Gage, Thomas. Probing the Crystallization Process and Morphology of Thin Films of Yttrium Iron Garnet on Non-Garnet Substrates with in situ TEM Methods.

Degree: PhD, Material Science and Engineering, 2018, University of Minnesota

URL: http://hdl.handle.net/11299/206280

► Thin films of yttrium iron garnet (YIG) are of high interest for promising photonics and spintronics applications. Integration challenges with current silicon processing technology have… (more)

Subjects/Keywords: in situ crystallization; laser annealing; TEM; UEM; YIG

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APA (6^th Edition):

Gage, T. (2018). Probing the Crystallization Process and Morphology of Thin Films of Yttrium Iron Garnet on Non-Garnet Substrates with in situ TEM Methods. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/206280

Chicago Manual of Style (16^th Edition):

Gage, Thomas. “Probing the Crystallization Process and Morphology of Thin Films of Yttrium Iron Garnet on Non-Garnet Substrates with in situ TEM Methods.” 2018. Doctoral Dissertation, University of Minnesota. Accessed January 24, 2021. http://hdl.handle.net/11299/206280.

MLA Handbook (7^th Edition):

Gage, Thomas. “Probing the Crystallization Process and Morphology of Thin Films of Yttrium Iron Garnet on Non-Garnet Substrates with in situ TEM Methods.” 2018. Web. 24 Jan 2021.

Vancouver:

Gage T. Probing the Crystallization Process and Morphology of Thin Films of Yttrium Iron Garnet on Non-Garnet Substrates with in situ TEM Methods. [Internet] [Doctoral dissertation]. University of Minnesota; 2018. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/11299/206280.

Council of Science Editors:

Gage T. Probing the Crystallization Process and Morphology of Thin Films of Yttrium Iron Garnet on Non-Garnet Substrates with in situ TEM Methods. [Doctoral Dissertation]. University of Minnesota; 2018. Available from: http://hdl.handle.net/11299/206280

University of Minnesota

8. Schliep, Karl. The Investigation Of New Magnetic Materials And Their Phenomena Using Ultrafast Fresnel Transmission Electron Microscopy.

Degree: PhD, Material Science and Engineering, 2017, University of Minnesota

URL: http://hdl.handle.net/11299/191448

► State-of-the-art technology drives scientific progress, pushing the boundaries of our current understanding of fundamental processes and mechanisms. Our continual scientific advancement is hindered only by… (more)

▼ State-of-the-art technology drives scientific progress, pushing the boundaries of our current understanding of fundamental processes and mechanisms. Our continual scientific advancement is hindered only by what we can observe and experimentally verify; thus, it is reasonable to assert that instrument development and improvement is the cornerstone for technological and intellectual growth. For example, the invention of transmission electron microscopy (TEM) allowed us to observe nanoscale phenomena for the first time in the 1930s and even now it is invaluable in the development of smaller, faster electronics. As we uncover more about the fundamentals of nanoscale phenomena, we have realized that images alone reveal only a snapshot of the story; to continue progressing we need a way to observe the entire scene unfold (e.g. how defects affect the flow of current across a transistor or how thermal energy propagates in nanoscale systems like graphene). Recently, by combining the spatial resolution of a TEM with the temporal resolution of ultrafast lasers, ultrafast electron microscopy  or microscope  (UEM) has allowed us to simultaneously observe transient nanoscale phenomena at ultrafast timescales. Ultrafast characterization techniques allow for the investigation of a new realm of previously unseen phenomenon inherent to the transient electronic, magnetic, and structural properties of materials. However, despite the progress made in ultrafast techniques, capturing the nanoscale spatial sub-ns temporal mechanisms and phenomenon at play in magnetic materials (especially during the operation of magnetic devices) has only recently become possible using UEM. With only a handful of instruments available, magnetic characterization using UEM is far from commonplace and any advances made are sparsely reported, and further, specific to the individual instrument. In this dissertation, I outline the development of novel magnetic materials and the establishment of a UEM lab at the University of Minnesota and how I explored the application of it toward the investigation of magnetic materials. In my discussion of UEM, I have made a concerted effort to highlight the unique challenges faced when getting a UEM lab running so that new researchers may circumvent these challenges. Of note in my graduate studies, I assisted in the development of three different magnetic material systems, strained Fe nanoparticles for permanent magnetic applications, FePd for applications in spintronic devices, and a rare-earth transition-metal (RE-TM) alloy that exhibits new magneto-optic phenomena. In studying the morphological and magnetic effects of lasers on these RE-TM alloys using the in situ laser irradiation capabilities of UEM along with standard TEM techniques and computational modeling, I uncovered a possible limitation in their utility for memory applications. Furthermore, with the aid of particle tracing software, I was able to optimize our UEM system for magnetic imaging and demonstrate the resolution of ultrafast demagnetization…

Subjects/Keywords: Electron Microscopy; In situ; Magnetism; Pulsed Laser; Ultrafast

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Schliep, K. (2017). The Investigation Of New Magnetic Materials And Their Phenomena Using Ultrafast Fresnel Transmission Electron Microscopy. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/191448

Chicago Manual of Style (16^th Edition):

Schliep, Karl. “The Investigation Of New Magnetic Materials And Their Phenomena Using Ultrafast Fresnel Transmission Electron Microscopy.” 2017. Doctoral Dissertation, University of Minnesota. Accessed January 24, 2021. http://hdl.handle.net/11299/191448.

MLA Handbook (7^th Edition):

Schliep, Karl. “The Investigation Of New Magnetic Materials And Their Phenomena Using Ultrafast Fresnel Transmission Electron Microscopy.” 2017. Web. 24 Jan 2021.

Vancouver:

Schliep K. The Investigation Of New Magnetic Materials And Their Phenomena Using Ultrafast Fresnel Transmission Electron Microscopy. [Internet] [Doctoral dissertation]. University of Minnesota; 2017. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/11299/191448.

Council of Science Editors:

Schliep K. The Investigation Of New Magnetic Materials And Their Phenomena Using Ultrafast Fresnel Transmission Electron Microscopy. [Doctoral Dissertation]. University of Minnesota; 2017. Available from: http://hdl.handle.net/11299/191448

University of New South Wales

9. Jahangir, Solmaz. In-situ study of solid state dewetting in metallic thin films.

Degree: Materials Science & Engineering, 2017, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/57585 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44124/SOURCE02?view=true

► Thin films are fabricated in conditions far from the equilibrium, and they bear a high surface to volume ratio. Therefore, when thermally activated, they gain… (more)

▼ Thin films are fabricated in conditions far from the equilibrium, and they bear a high surface to volume ratio. Therefore, when thermally activated, they gain the required atomic mobility to reduce their free energy associated with surfaces, by transforming to a stable morphology of isolated islands. This phenomenon is called “solid-state dewetting”. Solid-state dewetting of thin films is a source of failure in microelectronic applications.In the first part of this thesis, we present an in-situ investigation on the integrity of a polycrystalline Pt thin film which was enhanced by applying ZnO as an adhesion layer between the film and the Si substrate. Besides the typical morphological evolution during dewetting of a continuous thin film e.g. hillocking, hole formation, hole growth and formation of isolated islands, we report on two distinct events that were captured in real-time. Sublimation of ZnO and secondary hole formation via break up of blisters of Pt thin film, in this case at ~ 1053 K, and formation of an amorphous platinum silicide phase and Pt3Si intermetallic phase in later stages of dewetting. We do however highlight that these observations are for films exposed to high temperatures under high vacuum conditions and caution must be exercised when applying these observations to other systems.Moreover, solid-state dewetting can lead to the formation of complex submicron or nanostructures, depending on the original geometry of the film. In single crystal thin films, due to the structural symmetry and anisotropic surface properties, the ordered assembly of the islands occurs spontaneously during dewetting. There is an increasing interest in controlling the morphology of dewetting structures due to higher demand for the scaled-down devices. The morphological characteristics of these structures are manifested by instabilities that happen simultaneously during dewetting. Precise identification of these instabilities leads to an enhanced inference of the underpinning kinetic mechanisms that govern the formation of complex dewetting morphologies. In the second part of the thesis, we use pre-patterned single crystal Ni film on single crystal MgO substrate as a model system to study the effect of various parameters on final morphology of dewetted structures. More specifically, we investigate the effect of film's edge roughness, the in-plane crystallographic orientation of film patches, annealing temperature and annealing ambient on fingering instability. We also demonstrate that solid-state dewetting can be exploited as a self-assembly method to achieve the desired morphology via introducing a template to the edges of patches of single crystal Ni film. The template is systematically designed to facilitate the fingering instability and control the spacing of void fingers. Advisors/Committee Members: Valanoor, Nagarajan, Materials Science & Engineering, Faculty of Science, UNSW, Ferry, Michael, Materials Science & Engineering, Faculty of Science, UNSW.

Subjects/Keywords: In-situ Characterisation; Dewetting; Thin films; Confocal laser microscopy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jahangir, S. (2017). In-situ study of solid state dewetting in metallic thin films. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/57585 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44124/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Jahangir, Solmaz. “In-situ study of solid state dewetting in metallic thin films.” 2017. Doctoral Dissertation, University of New South Wales. Accessed January 24, 2021. http://handle.unsw.edu.au/1959.4/57585 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44124/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Jahangir, Solmaz. “In-situ study of solid state dewetting in metallic thin films.” 2017. Web. 24 Jan 2021.

Vancouver:

Jahangir S. In-situ study of solid state dewetting in metallic thin films. [Internet] [Doctoral dissertation]. University of New South Wales; 2017. [cited 2021 Jan 24]. Available from: http://handle.unsw.edu.au/1959.4/57585 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44124/SOURCE02?view=true.

Council of Science Editors:

Jahangir S. In-situ study of solid state dewetting in metallic thin films. [Doctoral Dissertation]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/57585 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44124/SOURCE02?view=true

10. Venturi, Linda. Etude des propriétés de photoluminescence de nano-matériaux sous champ électrique intense. : Study of photoluminescence properties of nanoscale systems under high electric field.

Degree: Docteur es, Physique, 2019, Normandie

URL: http://www.theses.fr/2019NORMR118

► Dans cette thèse, la tomographie à sonde atomique assistée par laser est couplée in situ à un banc de photoluminescence (PL), où le rayonnement laser… (more)

▼ Dans cette thèse, la tomographie à sonde atomique assistée par laser est couplée in situ à un banc de photoluminescence (PL), où le rayonnement laser pulsé est utilize pour déclencher l’évaporation ionique des échantillons et, simultanément, pour activer l’émission à partir des centres optiquement actifs présents dans le matériau. Pour ce travail, deux matériaux différents ont été sélectionnés : des nano-aiguilles de diamant avec des défauts optiquement actifs intégrés (centres de couleur) et une hétérostructure multi-quantique (MQW) ZnO / (Mg, Zn)O, qui contient des émetteurs quantiques d’épaisseurs différentes. Grâce à cette configuration originale de photoluminescence, l’influence du champ électrique sur la structure fine de certains centres de couleur, noyés dans les nano-aiguilles de diamant, a été observée. La première étude s’est concentrée sur le centre neutre de vacance d’azote (NV0), qui est l’un des centres de couleur les plus étudiés dans la littérature. L’évolution de la signature optique NV0, en fonction du biais appliqué, a permis d’évaluer la contrainte mécanique (> 1 GPa) et le champ électrique agissant sur les pointes de diamant. Ces résultats démontrent une nouvelle méthode originale pour effectuer la piezo-spectroscopie sans contact des systems nanométriques sous une contrainte de traction uniaxiale, générée par le champ électrique. Cette méthode a également été appliquée à un autre centre de couleur, dont la nature n’est toujours pas claire dans la littérature, émettant à 2,65 eV, et plus sensible que les centres de couleur NV0 au champ de contrainte / déformation. Des nouveaux résultats sur ses propriétés opto-mécaniques ont été obtenus, mais son identité reste à comprendre. Le champ d’évaporation du diamant étant très élevé, les nano-aiguilles de diamant n’ont pas été analysées à l’aide de La-APT. Par conséquent, la technique couplée in situ a été appliquée afin d’étudier l’hétérostructure ZnO / (Mg, Zn) O MQW, en accédant à la structure, à la composition et à la signature optique de l’échantillon sondé dans une seule expérience. Les spectres de photoluminescence acquis par le spécimen au cours de son évaporation en cours représentent une source unique d’informations pour la compréhension du mécanisme de l’interaction lumière-matière et la physique de la photoémission sous champ électrique élevé. La corrélation des informations structurelles et optiques, liées à cette hétérostructure MQW, démontre que la technique couplée in situ peut chevaucher la limite de diffraction du laser PL et que, comme pour les nano-aiguilles de diamant, il est possible d’estimer le stress de traction induit. Les résultats obtenus par couplage in situ de la technique La-APT avec la spectroscopie PL montrent qu’un tel instrument est une technique innovante et puissante pour effectuer des recherches à l’échelle nanométrique. Pour cette raison, ce travail peut ouvrir de nouvelles perspectives pour une compréhension approfondie de la physique liée aux systèmes étudiés en parallèle avec l’amélioration continue de la… Advisors/Committee Members: Vella, Angela (thesis director).

Subjects/Keywords: Tomographie à Sonde Atomique assistée par laser; Spectroscopie de photoluminescence; Technique in-situ; Corrélation optique-structurelle; Nanomatériaux; Centres de couleur du diamant; Hétérostructure à boîtes quantiques de ZnO/(Mg, Zn)O; Piézo-spectroscopie optique sans contact; Contrainte de traction; Propriétés opto-mécaniques,; Super-résolution; Laser-assisted Atom Probe Tomography; , Photoluminescence spectroscopy; In-situ technique; Optical-structural correlation; Nanomaterials; Diamond color centers; ZnO/(Mg, Zn)O multi-quantum-well heterostructure; Optical contactless piezo-spectroscopy; Tensile stress; Opto-mechanical properties; Super-resolution; 620.193

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Venturi, L. (2019). Etude des propriétés de photoluminescence de nano-matériaux sous champ électrique intense. : Study of photoluminescence properties of nanoscale systems under high electric field. (Doctoral Dissertation). Normandie. Retrieved from http://www.theses.fr/2019NORMR118

Chicago Manual of Style (16^th Edition):

Venturi, Linda. “Etude des propriétés de photoluminescence de nano-matériaux sous champ électrique intense. : Study of photoluminescence properties of nanoscale systems under high electric field.” 2019. Doctoral Dissertation, Normandie. Accessed January 24, 2021. http://www.theses.fr/2019NORMR118.

MLA Handbook (7^th Edition):

Venturi, Linda. “Etude des propriétés de photoluminescence de nano-matériaux sous champ électrique intense. : Study of photoluminescence properties of nanoscale systems under high electric field.” 2019. Web. 24 Jan 2021.

Vancouver:

Venturi L. Etude des propriétés de photoluminescence de nano-matériaux sous champ électrique intense. : Study of photoluminescence properties of nanoscale systems under high electric field. [Internet] [Doctoral dissertation]. Normandie; 2019. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2019NORMR118.

Council of Science Editors:

Venturi L. Etude des propriétés de photoluminescence de nano-matériaux sous champ électrique intense. : Study of photoluminescence properties of nanoscale systems under high electric field. [Doctoral Dissertation]. Normandie; 2019. Available from: http://www.theses.fr/2019NORMR118

11. Xu, Yiguo. Détection quasi-in situ de nanoparticules par incandescence induite par laser pendant la synthèse par dépôt chimique en phase vapeur de nanotubes de carbone : Quasi-in-situ detection of nanoparticles by laser-induced incandescence during chemical vapor deposition synthesis of carbon nanotubes.

Degree: Docteur es, Science des Matériaux, 2018, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2018SACLC070

►

Ce travail contribue à la quasi-in-situ détection des nanoparticules par la technique d’incandescence induite par laser (LII) pendant le dépôt chimique en phase vapeur avec… (more)

▼

Ce travail contribue à la quasi-in-situ détection des nanoparticules par la technique d’incandescence induite par laser (LII) pendant le dépôt chimique en phase vapeur avec catalyseur flottant (FCCVD) de nanotubes de carbone. Premièrement, la microscopie électronique en transmission (MET) à haute résolution était utilisé pour caractériser la nature et la taille des nanoparticules. Le signal théorique de LII a été simulé en considérant la densité des nanoparticules, la capacité thermique et la distribution de taille, etc. La sensibilité et l’incertitude concrètes des paramètres clés sur la taille évaluée des particules pour ce modelé ont été estimées. Le modèle LII a été validé par la comparaison des résultats évalués avec ceux obtenus par la MET. Ensuite, la technique mature LII combinée avec MET a été appliquée pour étudier l’évolution des nanoparticules dans la phase gazeuse le long de l’axe du réacteur. L’influence de la température, de la concentration de ferrocène, de la source de carbone et de la proportion hydrogène sur la taille des nanoparticules a également été démontrée. Enfin, les rôles des nanoparticules dans la phase gazeuse au cours du processus de synthèse des NTC ont été discutés en corrélant les informations sur l’évolution axiale des nanoparticules et la morphologie des NTC synthétisés sur le substrat le long de l’axe du réacteur. Un modèle basé sur la thermodynamique de la nucléation des nanoparticules a été proposé pour décrire le processus de formation des nanoparticules au cours du processus DCVCF. Il est constaté que les nanoparticules asformé en phase gazeuse présentent des structures cœur-coquille avec un noyau de α-Fe et la coque de carbone. Ainsi, les nanoparticules de fer en phase gazeuse ne pourraient pas contribuer à la croissance de NTC sur le substrat à cause de l’encapsulation de carbone. En même temps, la taille des nanoparticules évaluée par LII est en bon accord avec celle-ci déterminée par MET. Cette étude, montrant les relations potentielles entre les nanoparticules flottantes et les NTCs sur le substrat, révèle une perspective importante de l’application de LII pour comprendre et améliorer le processus DCVCF.

This work contributes to the quasi-in-situdetection of nanoparticles by laser induced incandescence(LII) technique during the floating catalytic chemicalvapor deposition (FCCVD) synthesis of Carbonnanotubes.First, high resolution transmission electron microscopy(TEM) was used to characterize the nanoparticlenature and size. The theoretical LII signal was simulatedby considering the nanoparticle density, heatcapacity and size distribution, etc. A detailed sensitivityand uncertainty of the key parameters on the evaluatedparticle size for this model was estimated. TheLII model was validated by a comparison of the evaluatedresults with the ones obtained by TEM measurements.Then, the developed LII technique combinedwith TEM was applied to investigate the evolutionof nanoparticles in the gas phase along thereactor axis. The influence of the temperature,…

Advisors/Committee Members: Bai, Jinbo (thesis director).

Subjects/Keywords: Incandescence induite par laser; Nanotubes de carbone; Nanoparticules; Détection quasi-in situ; Laser induced incandescence; Carbon nanotubes; Nanoparticles; Quasi-in-situ detection

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Xu, Y. (2018). Détection quasi-in situ de nanoparticules par incandescence induite par laser pendant la synthèse par dépôt chimique en phase vapeur de nanotubes de carbone : Quasi-in-situ detection of nanoparticles by laser-induced incandescence during chemical vapor deposition synthesis of carbon nanotubes. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2018SACLC070

Chicago Manual of Style (16^th Edition):

Xu, Yiguo. “Détection quasi-in situ de nanoparticules par incandescence induite par laser pendant la synthèse par dépôt chimique en phase vapeur de nanotubes de carbone : Quasi-in-situ detection of nanoparticles by laser-induced incandescence during chemical vapor deposition synthesis of carbon nanotubes.” 2018. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed January 24, 2021. http://www.theses.fr/2018SACLC070.

MLA Handbook (7^th Edition):

Xu, Yiguo. “Détection quasi-in situ de nanoparticules par incandescence induite par laser pendant la synthèse par dépôt chimique en phase vapeur de nanotubes de carbone : Quasi-in-situ detection of nanoparticles by laser-induced incandescence during chemical vapor deposition synthesis of carbon nanotubes.” 2018. Web. 24 Jan 2021.

Vancouver:

Xu Y. Détection quasi-in situ de nanoparticules par incandescence induite par laser pendant la synthèse par dépôt chimique en phase vapeur de nanotubes de carbone : Quasi-in-situ detection of nanoparticles by laser-induced incandescence during chemical vapor deposition synthesis of carbon nanotubes. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2018. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2018SACLC070.

Council of Science Editors:

Xu Y. Détection quasi-in situ de nanoparticules par incandescence induite par laser pendant la synthèse par dépôt chimique en phase vapeur de nanotubes de carbone : Quasi-in-situ detection of nanoparticles by laser-induced incandescence during chemical vapor deposition synthesis of carbon nanotubes. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2018. Available from: http://www.theses.fr/2018SACLC070

12. Ma, Yang. Étude de la formation et de l'activité catalytique de nanoparticules durant les premiers instants de la croissance de nanotubes de carbone par dépôt chimique en phase vapeur assisté par aérosol : Study on the formation and catalytic activity of nanoparticles in early stages of carbon nanotubes growth under aerosol-assisted chemical vapor deposition.

Degree: Docteur es, Matériaux, 2016, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2016SACLC047

►

De par leurs propriétés remarquables, les nanotubes de carbone (NTCs) reçoivent beaucoup d’attention et de nombreuses recherches sont menées sur ces matériaux depuis les dernières… (more)

▼

De par leurs propriétés remarquables, les nanotubes de carbone (NTCs) reçoivent beaucoup d’attention et de nombreuses recherches sont menées sur ces matériaux depuis les dernières décennies. Le nombre d'applications envisagées mais aussi la quantité demandée de NTCs augmentent chaque année. Pour atteindre une production à grande échelle et contrôlée, il est nécessaire d'avoir une bonne compréhension des mécanismes de croissance des NTCs. Dans ce manuscrit, la formation ainsi que l'activité catalytique de nanoparticules (NPs) par dépôt chimique en phase vapeur assisté par aérosol (CVD) sont étudiées expérimentalement, pour analyser le processus d'évolution des NPs et leur relation avec les NTCs.Dans le chapitre 1, nous présentons une introduction générale sur des structures, les méthodes de synthèse, les propriétés et les applications envisagées des NTCs, ainsi que l’état de l’art concernant l’étude des mécanismes de croissance des NTCs.Dans le chapitre 2, nous décrivons le système de dépôt chimique en phase vapeur avec catalyseur flottant, ainsi que les méthodes de diagnostic in-situ/ex-situ utilisées dans cette étude. La technique d’incandescence induite par laser (LII) est particulièrement importante dans ce chapitre, car cette technique nous permet de réaliser un diagnostic in situ sur la quantité/taille des NPs déposées pendant le processus de synthèse.Dans le chapitre 3, nous présentons l'évolution des NPs lors de la synthèse ainsi que les influences des différents paramètres de CVD (température, quantité de carbone/catalyseur, composition du gaz, etc.) sur les gouttelettes et les NPs respectivement. Un modèle pour la formation de NPs est proposé à la fin de ce chapitre.Dans le chapitre 4, les résultats des expériences sur l'évolution de la composition du gaz sont révélés. Ces résultats donnent des informations concernant les réactions chimiques ayant lieu dans la phase gazeuse lors de la synthèse des NTCs.Dans le chapitre 5, une étude détaillée de l'influence des paramètres de CVD sur les produits NTCs est menée, et les relations entre les NPs et les NTC sont discutées.Pour finir, des conclusions générales ainsi que les perspectives prévues pour les travaux futurs sont présentées.

Due to the outstanding properties in various aspects, carbon nanotubes (CNTs) received worldwide attentions and intensive investigations are carried out in the last decades. While the number of applications as well as the quantity demanded of CNTs are increasing year after year, to achieve large scale production of the desired structures in a controlled way, it is highly required having a clear understanding about the CNTs growth mechanism. In this study, the formation and catalytic activity of nanoparticles (NPs) under aerosol-assisted chemical vapor deposition (CVD) is experimentally investigated, aiming to study the NPs evolution process and their relation with the CNTs products.In chapter 1, we provide a general review of CNTs structures, synthesis methods, properties as well as applications. Moreover, the current situation of…

Advisors/Committee Members: Bai, Jinbo (thesis director).

Subjects/Keywords: Nanotube de carbone; Catalytique; Nanoparticules; Dépôt chimique en phase vapeur; In-situ diagnostic; D’incandescence induite par laser; Carbon nanotube; Catalytic; Nanoparticles; Chemical vapor deposition; In-situ diagnostic; Laser-induced incandescence

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ma, Y. (2016). Étude de la formation et de l'activité catalytique de nanoparticules durant les premiers instants de la croissance de nanotubes de carbone par dépôt chimique en phase vapeur assisté par aérosol : Study on the formation and catalytic activity of nanoparticles in early stages of carbon nanotubes growth under aerosol-assisted chemical vapor deposition. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2016SACLC047

Chicago Manual of Style (16^th Edition):

Ma, Yang. “Étude de la formation et de l'activité catalytique de nanoparticules durant les premiers instants de la croissance de nanotubes de carbone par dépôt chimique en phase vapeur assisté par aérosol : Study on the formation and catalytic activity of nanoparticles in early stages of carbon nanotubes growth under aerosol-assisted chemical vapor deposition.” 2016. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed January 24, 2021. http://www.theses.fr/2016SACLC047.

MLA Handbook (7^th Edition):

Ma, Yang. “Étude de la formation et de l'activité catalytique de nanoparticules durant les premiers instants de la croissance de nanotubes de carbone par dépôt chimique en phase vapeur assisté par aérosol : Study on the formation and catalytic activity of nanoparticles in early stages of carbon nanotubes growth under aerosol-assisted chemical vapor deposition.” 2016. Web. 24 Jan 2021.

Vancouver:

Ma Y. Étude de la formation et de l'activité catalytique de nanoparticules durant les premiers instants de la croissance de nanotubes de carbone par dépôt chimique en phase vapeur assisté par aérosol : Study on the formation and catalytic activity of nanoparticles in early stages of carbon nanotubes growth under aerosol-assisted chemical vapor deposition. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2016. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2016SACLC047.

Council of Science Editors:

Ma Y. Étude de la formation et de l'activité catalytique de nanoparticules durant les premiers instants de la croissance de nanotubes de carbone par dépôt chimique en phase vapeur assisté par aérosol : Study on the formation and catalytic activity of nanoparticles in early stages of carbon nanotubes growth under aerosol-assisted chemical vapor deposition. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2016. Available from: http://www.theses.fr/2016SACLC047

University of Alberta

13. Medina, Miguel A. Online characterization of particle based reactions by laser backscattering.

Degree: MS, Department of Chemical and Materials Engineering, 2016, University of Alberta

URL: https://era.library.ualberta.ca/files/c3484zh14q

► A fiber optic dynamic light scattering device was successfully developed for the in-situ characterization of particle size in turbid media. Currently available techniques are only… (more)

▼ A fiber optic dynamic light scattering device was successfully developed for the in-situ characterization of particle size in turbid media. Currently available techniques are only capable of performing characterizations at room temperature and are highly limited by the turbidity of the sample. In-situ particle size characterization was accomplished using the diffuse wave spectroscopy theory and time-dependent autocorrelation analysis. Using this basis for the interpretation, information regarding the particle morphology was obtained from the backscattering signals using two simultaneous lasers, of 532 and 655nm wavelength, at elevated pressures up to 5 MPa, and at temperatures up to 420 °C. Validation of the analytical technique was achieved by studying a stable particulate dispersion of Carbon Lampblack (CB) in water and 1-methylnaphthalene. The 162 nm average particle size of the dispersion was characterized ex-situ with transmission electron microscopy and a commercial laser diffraction apparatus. The average particle size obtained by this technique was 275±39 nm at room temperature and 216±23 nm at 280 °C, showing a good agreement compared with the ex-situ values. Ultimately, the goal of this work is to develop a technique capable to track on-line the size and concentration of nanoscale particles. For this purpose, sulfidation reaction of iron naphthenate was selected to study the in-situ generation of iron based nanoparticles. Particles of 202±33 nm average size were characterized by this technique, finding good agreement with ex-situ characterization of the collected reaction products. Further study of this reaction with the developed technique allowed to determine the temperature on-set for the particle generation at 274.6±0.7 °C. While simultaneous determination of particle size and concentration was not possible in this work, several modifications of the current design are presented in the end of this manuscript aiming to solve the issues encountered during this work.

Subjects/Keywords: in-situ particle characterization; laser backscattering; Diffuse wave spectroscopy; High Temperature; online particle reaction sizing

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APA (6^th Edition):

Medina, M. A. (2016). Online characterization of particle based reactions by laser backscattering. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/c3484zh14q

Chicago Manual of Style (16^th Edition):

Medina, Miguel A. “Online characterization of particle based reactions by laser backscattering.” 2016. Masters Thesis, University of Alberta. Accessed January 24, 2021. https://era.library.ualberta.ca/files/c3484zh14q.

MLA Handbook (7^th Edition):

Medina, Miguel A. “Online characterization of particle based reactions by laser backscattering.” 2016. Web. 24 Jan 2021.

Vancouver:

Medina MA. Online characterization of particle based reactions by laser backscattering. [Internet] [Masters thesis]. University of Alberta; 2016. [cited 2021 Jan 24]. Available from: https://era.library.ualberta.ca/files/c3484zh14q.

Council of Science Editors:

Medina MA. Online characterization of particle based reactions by laser backscattering. [Masters Thesis]. University of Alberta; 2016. Available from: https://era.library.ualberta.ca/files/c3484zh14q

University of Alberta

14. Medina Messina, Miguel A. Online characterization of particle based reactions by laser backscattering.

Degree: MS, Department of Chemical and Materials Engineering, 2016, University of Alberta

URL: https://era.library.ualberta.ca/files/cth83kz571

► A fiber optic dynamic light scattering device was successfully developed for the in-situ characterization of particle size in turbid media. Currently available techniques are only… (more)

▼ A fiber optic dynamic light scattering device was successfully developed for the in-situ characterization of particle size in turbid media. Currently available techniques are only capable of performing characterizations at room temperature and are highly limited by the turbidity of the sample. In-situ particle size characterization was accomplished using the diffuse wave spectroscopy theory and time-dependent autocorrelation analysis. Using this basis for the interpretation, information regarding the particle morphology was obtained from the backscattering signals using two simultaneous lasers, of 532 and 655nm wavelength, at elevated pressures up to 5 MPa, and at temperatures up to 420 °C. Validation of the analytical technique was achieved by studying a stable particulate dispersion of Carbon Lampblack (CB) in water and 1-methylnaphthalene. The 162 nm average particle size of the dispersion was characterized ex-situ with transmission electron microscopy and a commercial laser diffraction apparatus. The average particle size obtained by this technique was 275±39 nm at room temperature and 216±23 nm at 280 °C, showing a good agreement compared with the ex-situ values. Ultimately, the goal of this work is to develop a technique capable to track on-line the size and concentration of nanoscale particles. For this purpose, sulfidation reaction of iron naphthenate was selected to study the in-situ generation of iron based nanoparticles. Particles of 202±33 nm average size were characterized by this technique, finding good agreement with ex-situ characterization of the collected reaction products. Further study of this reaction with the developed technique allowed to determine the temperature on-set for the particle generation at 274.6±0.7 °C. While simultaneous determination of particle size and concentration was not possible in this work, several modifications of the current design are presented in the end of this manuscript aiming to solve the issues encountered during this work.

Subjects/Keywords: In-situ particle characterization; Laser backscattering; Diffuse wave spectroscopy; High Temperature; Online particle reaction sizing

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APA (6^th Edition):

Medina Messina, M. A. (2016). Online characterization of particle based reactions by laser backscattering. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/cth83kz571

Chicago Manual of Style (16^th Edition):

Medina Messina, Miguel A. “Online characterization of particle based reactions by laser backscattering.” 2016. Masters Thesis, University of Alberta. Accessed January 24, 2021. https://era.library.ualberta.ca/files/cth83kz571.

MLA Handbook (7^th Edition):

Medina Messina, Miguel A. “Online characterization of particle based reactions by laser backscattering.” 2016. Web. 24 Jan 2021.

Vancouver:

Medina Messina MA. Online characterization of particle based reactions by laser backscattering. [Internet] [Masters thesis]. University of Alberta; 2016. [cited 2021 Jan 24]. Available from: https://era.library.ualberta.ca/files/cth83kz571.

Council of Science Editors:

Medina Messina MA. Online characterization of particle based reactions by laser backscattering. [Masters Thesis]. University of Alberta; 2016. Available from: https://era.library.ualberta.ca/files/cth83kz571

Penn State University

15. Heigel, Jarred Christopher. Thermo-mechanical Model Development and Experimental Validation for Directed Energy Deposition Additive Manufacturing Processes.

Degree: 2015, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/25008

► Additive manufacturing (AM) enables parts to be built through the layer-by-layer addition of molten metal. In directed energy deposition (DED) AM, metal powder or wire… (more)

▼ Additive manufacturing (AM) enables parts to be built through the layer-by-layer addition of molten metal. In directed energy deposition (DED) AM, metal powder or wire is added into a melt pool that follows a pattern to fill in the cross section of the part. When compared to traditional manufacturing processes, AM has many advantages such as the ability to make internal features and to repair high-value parts. However, the large thermal gradients generated by AM result in plastic deformation. Thermo-mechanical models must be developed to predict the temperature and distortion produced by this process. Thermo-mechanical models have been developed for AM by several investigators. These models are often validated by measuring the temperatures during the deposition of a small part and the final distortion of the part. Unfortunately this is not a sufficient validation method for the non-linear thermo-mechanical model. Although good agreement between the thermal model and the temperatures measured during a small depositions can be achieved, it does not necessarily mean that the model will be accurate for an industrially relevant part that requires 10² - 10⁴ tracks and hours of processing time. The relatively small deviations between the model and the validation will propagate when modeling large depositions and could produce inaccurate results. The errors in a large part will be increased further if the assumptions made of the thermal boundary conditions are not appropriate for the system. The objective of this work is to develop and experimentally validate thermo-mechanical models for DED. Experiments are performed to characterize the distortion induced by laser cladding. The depositions require many tracks and nearly an hour of processing time, during which the temperature and the deflection are measured in situ so that the response of the plate to each deposition track is understood. Measurements are then made of the convection caused by two different laser deposition heads. Thermo-mechanical models are developed by implementing the measured rate of convective heat transfer and the temperature dependent material properties. The models are validated using in situ measurements of the temperature and the deflection generated during the process, as well as post-process measurements of the residual stress and the distorted shape. Finally, experiments and models are used to investigate the impact of feedstock selection, either powder or wire, on the DED process. Advisors/Committee Members: Panagiotis Michaleris, Dissertation Advisor/Co-Advisor, Ashok D Belegundu, Committee Member, Eric Russell Marsh, Committee Member, Allison Michelle Beese, Committee Member, Todd Palmer, Committee Member, Edward William Reutzel, Special Member.

Subjects/Keywords: Additive manufacturing; laser cladding; distortion; convection; finite element analysis; residual stress; in situ measurement

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APA (6^th Edition):

Heigel, J. C. (2015). Thermo-mechanical Model Development and Experimental Validation for Directed Energy Deposition Additive Manufacturing Processes. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/25008

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Heigel, Jarred Christopher. “Thermo-mechanical Model Development and Experimental Validation for Directed Energy Deposition Additive Manufacturing Processes.” 2015. Thesis, Penn State University. Accessed January 24, 2021. https://submit-etda.libraries.psu.edu/catalog/25008.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Heigel, Jarred Christopher. “Thermo-mechanical Model Development and Experimental Validation for Directed Energy Deposition Additive Manufacturing Processes.” 2015. Web. 24 Jan 2021.

Vancouver:

Heigel JC. Thermo-mechanical Model Development and Experimental Validation for Directed Energy Deposition Additive Manufacturing Processes. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Jan 24]. Available from: https://submit-etda.libraries.psu.edu/catalog/25008.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Heigel JC. Thermo-mechanical Model Development and Experimental Validation for Directed Energy Deposition Additive Manufacturing Processes. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/25008

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Wollongong

16. Niknafs, Salar. Study of micro-structural formations during solidification of steel.

Degree: PhD, 2013, University of Wollongong

URL: ; https://ro.uow.edu.au/theses/3797

► Solidification microstructure is a defining link between production techniques and the resulting mechanical properties of cast metals and in particular steel. The microstructural scales… (more)

▼ Solidification microstructure is a defining link between production techniques and the resulting mechanical properties of cast metals and in particular steel. The microstructural scales of these structures control the segregation profiles of solute elements in the interdendritic regions, thus determining the mechanical properties of the cast structure. Hence, understanding the various aspects of solidification is essential in the quest for the fabrication of better products. The microstructure achieved during solidification of alloys is a result of morphological evolution of the solid/liquid interface. In the past, it was shown that some of the contributing factors which influence the solid/liquid interface morphology are: temperature gradient, solidification rate and alloy composition. Real-time solidification studies in iron-based alloys are particularly difficult due to their occurrence at high temperatures. Consequently, real-time observations of solid/liquid interface morphologies are mostly limited to the study of transparent organic materials or alloys with relatively low melting points, using Bridgman-type furnaces and directional solidification techniques. In Chapter 2, a Laser Scanning Confocal Microscopy (LSCM) was used to experimentally study the microstructural formations during solidification of steel. The major objective of this chapter was to investigate the feasibility of the LSCM and the concentric solidification technique as an alternative to the traditional directional solidification methods in Bridgman-type furnaces. Experimental observations were carried out on a low-carbon, low-alloyed steel. The effect of varying amounts of copper additions on the interface instability was studied and subsequently discussed. The LSCM provided the possibility of real-time observations at temperatures as high as 1600◦C. The conventional LSCM’s furnace was equipped with a controller that cooled the specimens at controlled rates of up to 100◦C/min. Cooling rates of up to 2500◦C/min were also achieved by momentarily turning off the furnace power for short periods of time. By doing so, the microscope chamber cooled at rates which were measured subsequently by acquiring data from the thermocouples. In contrast to the Bridgman apparatus, where controlled temperature gradients can be induced, the temperature gradient cannot be externally controlled in the LSCM apparatus. The technique used in this study therefore reproduced a non-steady-state growth condition. In-situ observations provided the opportunity to study the planar to cellular interface transitions in steel and revealed some unique phenomena associated with this transition. In Chapter 3, MICRESS multi phase-field method was used to simulate the pattern formation during solidification of the low-carbon low-alloyed base steel. The model was linked with in-situ measurements of solid/liquid interfacial energy in the LSCM, to obtain a more reliable prediction of interface stability during solidification. Once a “Standard model”…

Subjects/Keywords: steel solidification; phase-field modelling; laser scanning confocal microscopy; in-situ; cellular dendritic

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Niknafs, S. (2013). Study of micro-structural formations during solidification of steel. (Doctoral Dissertation). University of Wollongong. Retrieved from ; https://ro.uow.edu.au/theses/3797

Chicago Manual of Style (16^th Edition):

Niknafs, Salar. “Study of micro-structural formations during solidification of steel.” 2013. Doctoral Dissertation, University of Wollongong. Accessed January 24, 2021. ; https://ro.uow.edu.au/theses/3797.

MLA Handbook (7^th Edition):

Niknafs, Salar. “Study of micro-structural formations during solidification of steel.” 2013. Web. 24 Jan 2021.

Vancouver:

Niknafs S. Study of micro-structural formations during solidification of steel. [Internet] [Doctoral dissertation]. University of Wollongong; 2013. [cited 2021 Jan 24]. Available from: ; https://ro.uow.edu.au/theses/3797.

Council of Science Editors:

Niknafs S. Study of micro-structural formations during solidification of steel. [Doctoral Dissertation]. University of Wollongong; 2013. Available from: ; https://ro.uow.edu.au/theses/3797

University of Arizona

17. Castillo, Susana Jazmin. Characterization of Recycled Metal Powder for Assessing Its Reusability in Additive Manufacturing of Engineering Parts and Components .

Degree: 2019, University of Arizona

URL: http://hdl.handle.net/10150/634223

► Additive manufacturing technologies such as Laser Powder Bed Fusion provide unprecedented abilities to manufacture complex 3-D parts and structures; however, the process produces unused metal… (more)

Subjects/Keywords: Additive Manufacturing; Characterization; Coherence Scanning Interferometry; In situ; Laser Powder Bed Fusion; Recyclability

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Castillo, S. J. (2019). Characterization of Recycled Metal Powder for Assessing Its Reusability in Additive Manufacturing of Engineering Parts and Components . (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/634223

Chicago Manual of Style (16^th Edition):

Castillo, Susana Jazmin. “Characterization of Recycled Metal Powder for Assessing Its Reusability in Additive Manufacturing of Engineering Parts and Components .” 2019. Masters Thesis, University of Arizona. Accessed January 24, 2021. http://hdl.handle.net/10150/634223.

MLA Handbook (7^th Edition):

Castillo, Susana Jazmin. “Characterization of Recycled Metal Powder for Assessing Its Reusability in Additive Manufacturing of Engineering Parts and Components .” 2019. Web. 24 Jan 2021.

Vancouver:

Castillo SJ. Characterization of Recycled Metal Powder for Assessing Its Reusability in Additive Manufacturing of Engineering Parts and Components . [Internet] [Masters thesis]. University of Arizona; 2019. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10150/634223.

Council of Science Editors:

Castillo SJ. Characterization of Recycled Metal Powder for Assessing Its Reusability in Additive Manufacturing of Engineering Parts and Components . [Masters Thesis]. University of Arizona; 2019. Available from: http://hdl.handle.net/10150/634223

University of South Carolina

18. Gordon, Christopher Michael. In-Situ Spectrocopy: Gas Mixture Analysis Using A Simplified Multi-Pass Capillary Cell and Optical Considerations In Dual-Pulse Laser-Induced Breakdown Spectroscopy Analysis of Bulk Aqueous Solutions.

Degree: MS, Chemistry and Biochemistry, 2011, University of South Carolina

URL: https://scholarcommons.sc.edu/etd/686

► This thesis describes two methods investigated for their uses as tools for in-situ spectroscopy. As knowledge in the Chemical Sciences as well as technology… (more)

Subjects/Keywords: Chemistry; Physical Sciences and Mathematics; In-Situ; Laser; Plasma; Remote; Sensor; Spectroscopy

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APA (6^th Edition):

Gordon, C. M. (2011). In-Situ Spectrocopy: Gas Mixture Analysis Using A Simplified Multi-Pass Capillary Cell and Optical Considerations In Dual-Pulse Laser-Induced Breakdown Spectroscopy Analysis of Bulk Aqueous Solutions. (Masters Thesis). University of South Carolina. Retrieved from https://scholarcommons.sc.edu/etd/686

Chicago Manual of Style (16^th Edition):

Gordon, Christopher Michael. “In-Situ Spectrocopy: Gas Mixture Analysis Using A Simplified Multi-Pass Capillary Cell and Optical Considerations In Dual-Pulse Laser-Induced Breakdown Spectroscopy Analysis of Bulk Aqueous Solutions.” 2011. Masters Thesis, University of South Carolina. Accessed January 24, 2021. https://scholarcommons.sc.edu/etd/686.

MLA Handbook (7^th Edition):

Gordon, Christopher Michael. “In-Situ Spectrocopy: Gas Mixture Analysis Using A Simplified Multi-Pass Capillary Cell and Optical Considerations In Dual-Pulse Laser-Induced Breakdown Spectroscopy Analysis of Bulk Aqueous Solutions.” 2011. Web. 24 Jan 2021.

Vancouver:

Gordon CM. In-Situ Spectrocopy: Gas Mixture Analysis Using A Simplified Multi-Pass Capillary Cell and Optical Considerations In Dual-Pulse Laser-Induced Breakdown Spectroscopy Analysis of Bulk Aqueous Solutions. [Internet] [Masters thesis]. University of South Carolina; 2011. [cited 2021 Jan 24]. Available from: https://scholarcommons.sc.edu/etd/686.

Council of Science Editors:

Gordon CM. In-Situ Spectrocopy: Gas Mixture Analysis Using A Simplified Multi-Pass Capillary Cell and Optical Considerations In Dual-Pulse Laser-Induced Breakdown Spectroscopy Analysis of Bulk Aqueous Solutions. [Masters Thesis]. University of South Carolina; 2011. Available from: https://scholarcommons.sc.edu/etd/686

University of Manchester

19. Leung, Chu Lun alex. X-ray imaging of powder consolidation during laser additive manufacturing.

Degree: 2018, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313778

► The laser-matter interaction and powder consolidation in laser additive manufacturing (LAM) occur on very short time scales (10-6 - 10-3 s); and they have proven… (more)

▼ The laser-matter interaction and powder consolidation in laser additive manufacturing (LAM) occur on very short time scales (10-6 - 10-3 s); and they have proven difficult to characterise. A better understanding of the underlying mechanisms during LAM is crucial for prediction and optimisation of part properties. This thesis highlights the development and applications of a LAM process replicator (LAMPR), combined with in operando high-speed synchrotron X-ray imaging and image analysis to study these mechanisms. Using this setup, the sequential powder consolidation phenomena were revealed in LAM of stainless steel (SS316L), a Fe-Ni alloy (Invar36) and bioactive glass (13-93). The consolidation mechanisms of alloy powders are driven by molten pool wetting and vapour-driven powder entrainment. The principal consolidation mechanism of 13-93 bioactive glass is driven by viscous flow. The evolution of porosity and spatter were revealed during LAM of virgin and oxidised Invar 36 powders under different build conditions. The oxide films altered the Marangoni convection from centrifugal to centripetal, restricted the melt flow (and gas transport) in the melt track and promoted pore growth. Several new pore mechanisms were uncovered, including pore migration, dissolution, dispersion, and bursting. The laser-induced gas/vapour jet promoted the formation of melt tracks and denuded zones while ejecting spatter at velocities up to 1 m/s along the argon gas flow and laser scanning directions. In addition, a new spatter mechanism has been discovered; spatter can be formed by laser-driven gas expansion. Laser re-melting of large pre-existing pores can result in two extreme outcomes: (1) pore healing by Marangoni flow and (2) formation of droplet spatter and open pore. These results have clarified the physics behind previous hypotheses and proposed new mechanisms in LAM, which are critical for the development of LAM and simulation models of the process. Advisors/Committee Members: WITHERS, PHILIP PJ, Lee, Peter, Withers, Philip.

Subjects/Keywords: Additive manufacturing; X-ray imaging; Laser powder bed fusion; Powder consolidation; Laser melting; Bioactive glass; Aerospace; Synchrotron X-ray; in situ

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APA (6^th Edition):

Leung, C. L. a. (2018). X-ray imaging of powder consolidation during laser additive manufacturing. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313778

Chicago Manual of Style (16^th Edition):

Leung, Chu Lun alex. “X-ray imaging of powder consolidation during laser additive manufacturing.” 2018. Doctoral Dissertation, University of Manchester. Accessed January 24, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313778.

MLA Handbook (7^th Edition):

Leung, Chu Lun alex. “X-ray imaging of powder consolidation during laser additive manufacturing.” 2018. Web. 24 Jan 2021.

Vancouver:

Leung CLa. X-ray imaging of powder consolidation during laser additive manufacturing. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2021 Jan 24]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313778.

Council of Science Editors:

Leung CLa. X-ray imaging of powder consolidation during laser additive manufacturing. [Doctoral Dissertation]. University of Manchester; 2018. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313778

20. Liu, Jiangwei. Maîtrise du procédé hybride de projection thermique avec refusion laser in-situ : approches numérique et expérimentale : Investigation of hybrid plasma spraying process with in situ laser remelting : numerical and experimental methods.

Degree: Docteur es, Matériaux, 2016, Belfort-Montbéliard

URL: http://www.theses.fr/2016BELF0284

► La projection hybride combinant la projection plasma et la refusion laser est une solution alternative permettant de diminuer ou même d'éliminer la présence de pores… (more)

▼ La projection hybride combinant la projection plasma et la refusion laser est une solution alternative permettant de diminuer ou même d'éliminer la présence de pores et de fissures au sein d'un dépôt brut de projection. Lors d'un procédé de projection plasma ou de refusion laser, le système substrat/dépôt subissant l'élévation de température,la fusion, la solidification et le refroidissement rapide est ainsi soumis à des gradients de température élevés, un niveau de contraintes élevé, et même un risque de formation de fissures. Il est alors important de pouvoir maîtriserles variations de température et la distribution des contraintes résiduelles au sein même du système. Concernantles travaux effectués dans cette thèse, des modèles thermiques et mécaniques ont été développés à l'aide dulogiciel ANSYS, de sorte à améliorer notre compréhension des comportements thermique et mécanique des revêtements élaborés par projection plasma avec refusion laser.Tout d'abord, la simulation du procédé de projection plasma a été développée afin de prédire les champs transitoires de température, la déformation finale de l'échantillon et les contraintes résiduelles dans des dépôts céramiques (alumine) et métalliques (NiCrBSi). Les contraintes résiduelles résultent de l'équilibre entre contraintes de trempe (toujours en tension) et contraintes thermiques lors du refroidissement final (en compression ou en tension suivant le cas). En raison de la faible limite d'élasticité du dépôt, les contraintes thermiques dominent les contraintes résiduelles dans le cas du dépôt d'alumine. En revanche, les contraintes de trempe dans le dépôt de NiCrBSi sont plus importantes. Par ailleurs, l'augmentation de l'efficacité du système de refroidissement mis en oeuvre permet de diminuer le niveau des contraintes résiduelles dans le dépôt d'alumine. Inversement les contraintes résiduelles au sein du dépôt de NiCrBSi augmentent lorsque le refroidissement en cours de projection est accru. L'analyse thermique permettant de simuler le procédé de refusion laser à posteriori d'un revêtement de NiCrBSi a été effectuée de sorte à évaluer les effets des paramètres du laser sur le champ de température engendré et laforme du bain refondu. Un coefficient d'absorption de 0.5 a été estimé par comparaison de l'épaisseur du bain refondu obtenue par les méthodes numérique et expérimentale. De plus, les morphologies de revêtements refondus ont été caractérisées par méthodes expérimentales. Selon l'analyse mécanique de la refusion laser à posteriori, les contraintes résiduelles sont en tension dans le dépôt refondu, mais en compression vers la zone non-refondue.Concernant le modèle portant sur l'élaboration de couches multiples, permettant de simuler le procédé de refusion laser in-situ, une diminution des contraintes transitoires au sein des couches préalablement élaborées est induite par l'accumulation progressive de chaleur au cours du processus d'élaboration. Après refroidissement final, les contraintes résiduelles suivant la direction de déplacement présentent une… Advisors/Committee Members: Costil, Sophie (thesis director), Bolot, Rodolphe (thesis director).

Subjects/Keywords: Projection plasma; Refusion laser a posteriori; Refusion laser in situ; Modèles de simulation; Forme du bain refondu; Distribution des contraintes; Plasma spraying; Laser post-remelting; Laser in situ remelting; Simulation models; Remelted pool shape; Stress distribution; 620

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APA (6^th Edition):

Liu, J. (2016). Maîtrise du procédé hybride de projection thermique avec refusion laser in-situ : approches numérique et expérimentale : Investigation of hybrid plasma spraying process with in situ laser remelting : numerical and experimental methods. (Doctoral Dissertation). Belfort-Montbéliard. Retrieved from http://www.theses.fr/2016BELF0284

Chicago Manual of Style (16^th Edition):

Liu, Jiangwei. “Maîtrise du procédé hybride de projection thermique avec refusion laser in-situ : approches numérique et expérimentale : Investigation of hybrid plasma spraying process with in situ laser remelting : numerical and experimental methods.” 2016. Doctoral Dissertation, Belfort-Montbéliard. Accessed January 24, 2021. http://www.theses.fr/2016BELF0284.

MLA Handbook (7^th Edition):

Liu, Jiangwei. “Maîtrise du procédé hybride de projection thermique avec refusion laser in-situ : approches numérique et expérimentale : Investigation of hybrid plasma spraying process with in situ laser remelting : numerical and experimental methods.” 2016. Web. 24 Jan 2021.

Vancouver:

Liu J. Maîtrise du procédé hybride de projection thermique avec refusion laser in-situ : approches numérique et expérimentale : Investigation of hybrid plasma spraying process with in situ laser remelting : numerical and experimental methods. [Internet] [Doctoral dissertation]. Belfort-Montbéliard; 2016. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2016BELF0284.

Council of Science Editors:

Liu J. Maîtrise du procédé hybride de projection thermique avec refusion laser in-situ : approches numérique et expérimentale : Investigation of hybrid plasma spraying process with in situ laser remelting : numerical and experimental methods. [Doctoral Dissertation]. Belfort-Montbéliard; 2016. Available from: http://www.theses.fr/2016BELF0284

21. Baudrillart, Benoit. Etude du procédé de croissance de films de diamant nanocristallin par dépôt chimique en phase vapeur assisté par plasma micro-onde distribué, à basse température et basse pression : Study of nanocrystalline diamond film growth process by distributed antenna array microwave plasma assisted chemical vapor deposition, at low temperature and low pressure.

Degree: Docteur es, Genies des procédés, 2017, Sorbonne Paris Cité

URL: http://www.theses.fr/2017USPCD051

►

Ce travail de thèse porte sur la compréhension et le contrôle du procédé de croissance de films de diamant nanocristallin (DNC) par dépôt chimique en… (more)

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Ce travail de thèse porte sur la compréhension et le contrôle du procédé de croissance de films de diamant nanocristallin (DNC) par dépôt chimique en phase vapeur assisté par plasma micro-onde distribué. Deux axes de travail ont été suivis pour atteindre ces objectifs : une étude « matériau » visant à étudier les mécanismes de germination et de croissance et les caractéristiques des films de DNC élaborés ; une étude « plasma » s’intéressant au diagnostic des décharges basse pression H₂ /CH₄/CO₂ utilisées pour la croissance.Concernant le premier volet, des techniques de caractérisation ex situ, telles que la microscopie électronique à balayage, à transmission haute résolution et à force atomique, la spectroscopie Raman, la diffraction des rayons X, la réflectométrie UV-visible, et in situ, telles que l’interférométrie de réflectance laser, ont été mises en oeuvre pour étudier la densité de germination, la morphologie, la topographie, la microstructure, la pureté et la vitesse de croissance des films de DNC. L’influence de certains paramètres du procédé, tels que la pression dans l’enceinte, la position du substrat, la composition gazeuse, la température de surface, la puissance micro-onde et le prétraitement ex situ du substrat, a été étudié pour le silicium. La synthèse de DNC jusqu’à une température aussi basse que 130 °C a ainsi pu être maîtrisée. La faisabilité de la croissance à cette température sur un matériau polymère comme le polytétrafluoroéthylène (PTFE) a été démontrée. La croissance de films de DNC sur d’autres types de substrats tels que le nitrure de silicium et l'acier inoxydable a également été examinée. Concernant la deuxième partie de ce travail, le diagnostic du plasma de dépôt a été effectué par spectroscopie optique d’émission et spectroscopie d'absorption infrarouge en utilisant comme sources de rayonnement des diodes lasers accordables en longueurs d’ondes et des lasers à cascade quantique à cavité externe. L’influence des conditions expérimentales, en particulier de la puissance micro-onde et de la pression dans l’enceinte, sur la concentration du radical méthyl CH₃, précurseur de croissance du diamant, et de cinq molécules stables (CH₄, CO₂, CO, C₂H₂, C₂H₆), ainsi que sur le degré de dissociation de H₂ et les températures cinétiques, vibrationnelles et rotationnelles des espèces, a été étudiée. Le degré de dissociation élevé des précurseurs gazeux, pour une température de gaz relativement faible de quelques centaines de kelvins, indiquent que la chimie du plasma est principalement gouvernée par des processus électroniques. Le système à plasma micro-onde distribué utilisé permet cependant de produire certaines espèces de croissance et de gravure en quantité comparable aux procédés de croissance de DNC conventionnels tout en permettant le processus de synthèse à basse température.

This PhD thesis focuses on the understanding and the control of the nanocrystalline diamond (NCD) film growth process by distributed antenna array microwave plasma-assisted chemical vapor deposition. Two approaches…

Advisors/Committee Members: Achard, Jocelyn (thesis director), Bénédic, Fabien (thesis director).

Subjects/Keywords: Diagnostic in situ; In situ diagnostic

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Baudrillart, B. (2017). Etude du procédé de croissance de films de diamant nanocristallin par dépôt chimique en phase vapeur assisté par plasma micro-onde distribué, à basse température et basse pression : Study of nanocrystalline diamond film growth process by distributed antenna array microwave plasma assisted chemical vapor deposition, at low temperature and low pressure. (Doctoral Dissertation). Sorbonne Paris Cité. Retrieved from http://www.theses.fr/2017USPCD051

Chicago Manual of Style (16^th Edition):

Baudrillart, Benoit. “Etude du procédé de croissance de films de diamant nanocristallin par dépôt chimique en phase vapeur assisté par plasma micro-onde distribué, à basse température et basse pression : Study of nanocrystalline diamond film growth process by distributed antenna array microwave plasma assisted chemical vapor deposition, at low temperature and low pressure.” 2017. Doctoral Dissertation, Sorbonne Paris Cité. Accessed January 24, 2021. http://www.theses.fr/2017USPCD051.

MLA Handbook (7^th Edition):

Baudrillart, Benoit. “Etude du procédé de croissance de films de diamant nanocristallin par dépôt chimique en phase vapeur assisté par plasma micro-onde distribué, à basse température et basse pression : Study of nanocrystalline diamond film growth process by distributed antenna array microwave plasma assisted chemical vapor deposition, at low temperature and low pressure.” 2017. Web. 24 Jan 2021.

Vancouver:

Baudrillart B. Etude du procédé de croissance de films de diamant nanocristallin par dépôt chimique en phase vapeur assisté par plasma micro-onde distribué, à basse température et basse pression : Study of nanocrystalline diamond film growth process by distributed antenna array microwave plasma assisted chemical vapor deposition, at low temperature and low pressure. [Internet] [Doctoral dissertation]. Sorbonne Paris Cité; 2017. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2017USPCD051.

Council of Science Editors:

Baudrillart B. Etude du procédé de croissance de films de diamant nanocristallin par dépôt chimique en phase vapeur assisté par plasma micro-onde distribué, à basse température et basse pression : Study of nanocrystalline diamond film growth process by distributed antenna array microwave plasma assisted chemical vapor deposition, at low temperature and low pressure. [Doctoral Dissertation]. Sorbonne Paris Cité; 2017. Available from: http://www.theses.fr/2017USPCD051

22. Kudryavtsev, Philipp. An Experimental Investigation of Water Influence on Dry Forward In-situ Combustion.

Degree: 2013, Texas Digital Library

URL: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66610

► In-situ combustion (ISC), also known as fire flooding, is not a new thermal enhanced oil recovery (EOR) technique. It is a potential alternative for heavy… (more)

Subjects/Keywords: In-situ combustion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kudryavtsev, P. (2013). An Experimental Investigation of Water Influence on Dry Forward In-situ Combustion. (Thesis). Texas Digital Library. Retrieved from http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66610

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kudryavtsev, Philipp. “An Experimental Investigation of Water Influence on Dry Forward In-situ Combustion.” 2013. Thesis, Texas Digital Library. Accessed January 24, 2021. http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66610.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kudryavtsev, Philipp. “An Experimental Investigation of Water Influence on Dry Forward In-situ Combustion.” 2013. Web. 24 Jan 2021.

Vancouver:

Kudryavtsev P. An Experimental Investigation of Water Influence on Dry Forward In-situ Combustion. [Internet] [Thesis]. Texas Digital Library; 2013. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66610.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kudryavtsev P. An Experimental Investigation of Water Influence on Dry Forward In-situ Combustion. [Thesis]. Texas Digital Library; 2013. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66610

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

KTH

23. Hanke, Patric. Pressometer : En in situ-metod för Sveriges friktionsjordar.

Degree: Soil and Rock Mechanics, 2016, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182094

► Fältgeotekniska undersökningar är en viktig del av geotekniken och används vid nästan alla byggprojekt för att utreda markförhållanden och skapa underlag för dimensionering av… (more)

▼ Fältgeotekniska undersökningar är en viktig del av geotekniken och används vid nästan alla byggprojekt för att utreda markförhållanden och skapa underlag för dimensionering av konstruktioner. För att optimera grundläggningsdesign önskas ofta flera fältmetoder eftersom metodernas olika tillvägagångssätt kan resultera i skilda resultat och parametrar, vilka tillsammans möjliggör undersökningar i alla tänkbara jordförhållanden. En metod erkänd utomlands för sin höga tillförlitlighet och användningsbredd är pressometern, en metod som är på väg att glömmas bort i Sverige. Syftet med examensarbetet var att studera pressometerns potential och användningsområde i Sverige. Pressometern som metod bygger på radiell expansion och mäter jordens volymförändring genom trycksättning. Förfaringssättet som pressometern belastar jorden på liknar situationen som jorden kommer att utsättas för under byggnation. Pressometerförsök resulterar i metodspecifika hållfastighets- och deformationsparametrar, från vilka särskilda beräkningsmodeller för uppskattning av bärförmåga och sättningar har utvecklats. Målet var att förse svenska geotekniker med en referens för att förhålla sig till pressometerresultat och -modeller. Ett intressant område för pressometern i Sverige är friktionsjordar där ett behov av pålitliga in situ-metoder har identifierats. Beräkningsmodellerna baserade på pressometerresultat har utvärderats och jämförts med beräkningsmodeller för hejarsondering vilken är en vanlig sonderingsmetod i friktionsjord. Vidare har empirisk data från projekt där båda metoderna använts, analyserats och empiriska samband utvärderats mellan dem. Beräkningsmodellerna tolkades sedan mot det empiriska sambandet. Slutligen utfördes ett fältexperiment med de båda metoderna, som tyvärr misslyckades. Dataanalysen visar på ett tydligt empiriskt samband mellan hejarsondering och pressometerförsök, dock grundade sig den empiriska analysen på endast 14 observationer och hög standardavvikelse iakttogs. Beräkningsmodellerna för vardera metod visade sig skilja markant. Gällande beräknad vertikal bärförmåga kunde visas att för konstruktioner med stort relativt grundläggningsdjup beräknas den vertikala bärförmågan högre med pressometermodellen än hejarmodellen. För sättningsberäkningar ger pressometermodellen gynnsammare uppskattad sättning vid ökad plattbredd än hejarmodellen. Sammanfattningsvis visar studien på att pressometern har ett tydligt användningsområde i Sverige med bra beräkningsmodeller men att klara regler och normer saknas och borde förtydligas. Pressometern är en in situ-metod som i praktiken kantas av problem i utförandet men att den teoretiska grunden och behovet av verklighetsnära fältmetoder ändå skapar utrymme för metoden i svenska friktionsjordar.

Subjects/Keywords: Pressometer; In situ

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hanke, P. (2016). Pressometer : En in situ-metod för Sveriges friktionsjordar. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182094

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hanke, Patric. “Pressometer : En in situ-metod för Sveriges friktionsjordar.” 2016. Thesis, KTH. Accessed January 24, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182094.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hanke, Patric. “Pressometer : En in situ-metod för Sveriges friktionsjordar.” 2016. Web. 24 Jan 2021.

Vancouver:

Hanke P. Pressometer : En in situ-metod för Sveriges friktionsjordar. [Internet] [Thesis]. KTH; 2016. [cited 2021 Jan 24]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182094.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hanke P. Pressometer : En in situ-metod för Sveriges friktionsjordar. [Thesis]. KTH; 2016. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182094

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Tampereen ammattikorkeakoulu

24. Alanen, Osku. Expression of miR-32, Ki-67, Btg2, and Pten in Transgenic Mouse Prostate Tissue.

Degree: 2014, Tampereen ammattikorkeakoulu

URL: http://www.theseus.fi/handle/10024/81469

►

Prostate cancer is the most common type of cancer found in men. An advanced form of the cancer – castration-resistant prostate cancer – is responsible… (more)

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Prostate cancer is the most common type of cancer found in men. An advanced form of the cancer – castration-resistant prostate cancer – is responsible for over 28 000 deaths in the United States every year with no current curative treatments available. As a result, new biomarkers and treatments are desperately needed. Putative biomarkers include, for example, certain microRNAs – small non-coding RNAs that are involved in the regulation of gene expression – or tumor suppressor genes that are responsive for cell cycle regulation. The objective of the thesis was to investigate the expression of several biomarkers in transgenic mouse prostate tissue. The purpose was to establish protocols for the in situ hybridization of miR-32, and immunohistochemical staining methods for Ki-67, Btg2, and Pten – and to investigate their expression in transgenic mouse prostate tissue. During this thesis, a successful protocol for the immunohistochemistry of Ki-67, Btg2, and Pten with PAXgene fixation was established. A working protocol for the in situ hybridization of miR-32 was also established, but with inconsistent staining. A low level of miR-32 expression was detected in the dorsolateral lobe of both wild type (WT) and transgenic (TG) prostates. Ki-67 was shown to have a low expression in both WT and TG prostates. Btg2 was expressed mainly in the basal cells of both WT and TG prostates, including the urethra and ductus deferens. Similarily, Pten expression was observed in the basal cells of both WT and TG urethra and, additionally, in the prostate. All biomarkers had close to identical expression in both WT and TG prostates. In conclusion, the protocol established here for the immunohistochemistry of Ki-67, Btg2, and Pten is sufficient for further use with commercial PAXgene fixation. However, the immunohistochemistry here should be repeated with fresh tissue sections, in order to ensure consistent staining of all sections. Further optimization should be attempted with in situ hybridization before moving into samples with confirmed prostatic lesions. In the future, the protocol established here for Ki-67, Btg2, and Pten can be used in mouse samples with confirmed prostatic lesions in order to help evaluate their role in prostate carcinogenesis, and in the formation of castration resistance.

Eturauhassyöpä on miesten yleisin syöpä. Kastraatioresistentti eturauhassyöpä on eturauhassyövän edistynyt muoto, johon ei ole löydetty parantavaa hoitokeinoa. Kastraatioresistentti eturauhassyöpä on vastuussa yli 28 000 kuolemasta vuosittain USA:ssa. Tästä johtuen uusia biomarkkereita ja hoitokeinoja etsitään jatkuvasti. Mahdollisia biomarkkereita voivat olla esimerkiksi mikroRNA:t, jotka ovat geenien ilmentymistä sääteleviä lyhyitä ei-koodaavia RNA:ita. Biomarkkereihin voivat kuulua myös eri tuumorisuppressorigeenit, jotka ovat osa solusyklin säätelyä. Opinnäytetyön tavoitteena oli tutkia useiden eri biomarkkerien ilmentymistä transgeenisen hiiren eturauhaskudoksessa. Opinnäytetyön tarkoituksena oli pystyttää in situ hybridisaatio…

Advisors/Committee Members: Tampereen ammattikorkeakoulu.

Subjects/Keywords: in situ hybridisaatio

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alanen, O. (2014). Expression of miR-32, Ki-67, Btg2, and Pten in Transgenic Mouse Prostate Tissue. (Thesis). Tampereen ammattikorkeakoulu. Retrieved from http://www.theseus.fi/handle/10024/81469

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Alanen, Osku. “Expression of miR-32, Ki-67, Btg2, and Pten in Transgenic Mouse Prostate Tissue.” 2014. Thesis, Tampereen ammattikorkeakoulu. Accessed January 24, 2021. http://www.theseus.fi/handle/10024/81469.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Alanen, Osku. “Expression of miR-32, Ki-67, Btg2, and Pten in Transgenic Mouse Prostate Tissue.” 2014. Web. 24 Jan 2021.

Vancouver:

Alanen O. Expression of miR-32, Ki-67, Btg2, and Pten in Transgenic Mouse Prostate Tissue. [Internet] [Thesis]. Tampereen ammattikorkeakoulu; 2014. [cited 2021 Jan 24]. Available from: http://www.theseus.fi/handle/10024/81469.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alanen O. Expression of miR-32, Ki-67, Btg2, and Pten in Transgenic Mouse Prostate Tissue. [Thesis]. Tampereen ammattikorkeakoulu; 2014. Available from: http://www.theseus.fi/handle/10024/81469

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Queens University

25. Gaines, Steven. In Situ Stress Estimation Methods and the Integration of Numerical Modelling for Stress Reconstruction and Future Stress Evolution .

Degree: Geological Sciences and Geological Engineering, 2013, Queens University

URL: http://hdl.handle.net/1974/8003

► A reliable estimation of in situ stress orientation and magnitude is necessary for determining wellbore stability in the oil and gas industry, or assessing excavation… (more)

▼ A reliable estimation of in situ stress orientation and magnitude is necessary for determining wellbore stability in the oil and gas industry, or assessing excavation stability for mining and civil engineering projects. Methods of stress estimation in deep borehole investigations are generally limited to the use of hydraulic methods or borehole imaging techniques, which identify borehole breakouts and/or borehole deformation. However, the collection of data in a thrust regime, or in horizontally laminated ground, can be difficult and lead to unreliable results. Moreover, the back analysis of stress magnitude from both hydraulic methods and borehole imaging methods are sensitive to estimates of strength and elastic properties around the borehole. This research has shown that the magnitude of the axial stress relative to the stresses normal to the borehole axis contributes to the magnitude and distribution of maximum deviatoric stress experienced around an advancing borehole. Furthermore, an analysis of the stress path incorporating the complete stress tensor shows that the maximum deviatoric stress does not always correlate with the typical solutions for induced stresses around a circular excavation. As a result of the limitations and uncertainties associated with traditional stress estimation methods, an integrated approach to determining the stress conditions at a given site using numerical models to simulate the loading history has been evaluated. A 2-dimensional finite element model of the Paleozoic sedimentary sequence of the eastern edge of the Michigan basin has shown that a systematic incorporation of the geological and stress history can approximate a given stress profile. Numerical models are also applied for estimating the magnitude of glacially induced stress change in the upper crust for the purpose of estimating long-term stress evolution. The framework and methodology used for numerical stress reconstruction and evolution can be included at the site characterization and engineering design stages for various types of projects, including deep geologic repositories, where estimates of in situ stress and future stress change are important.

Subjects/Keywords: In Situ Stress

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gaines, S. (2013). In Situ Stress Estimation Methods and the Integration of Numerical Modelling for Stress Reconstruction and Future Stress Evolution . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/8003

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gaines, Steven. “In Situ Stress Estimation Methods and the Integration of Numerical Modelling for Stress Reconstruction and Future Stress Evolution .” 2013. Thesis, Queens University. Accessed January 24, 2021. http://hdl.handle.net/1974/8003.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gaines, Steven. “In Situ Stress Estimation Methods and the Integration of Numerical Modelling for Stress Reconstruction and Future Stress Evolution .” 2013. Web. 24 Jan 2021.

Vancouver:

Gaines S. In Situ Stress Estimation Methods and the Integration of Numerical Modelling for Stress Reconstruction and Future Stress Evolution . [Internet] [Thesis]. Queens University; 2013. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1974/8003.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gaines S. In Situ Stress Estimation Methods and the Integration of Numerical Modelling for Stress Reconstruction and Future Stress Evolution . [Thesis]. Queens University; 2013. Available from: http://hdl.handle.net/1974/8003

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

26. Qiu, Junyi. Analysis of transistor laser intra-cavity photon-assisted tunneling for direct voltage modulation.

Degree: MS, Electrical & Computer Engr, 2016, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/95598

► High-speed optical interconnect made with semiconductor lasers is expected to play an important role in the upcoming age of big data. The technology of diode… (more)

Subjects/Keywords: Transistor Laser; Photon-Assisted Tunneling

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APA (6^th Edition):

Qiu, J. (2016). Analysis of transistor laser intra-cavity photon-assisted tunneling for direct voltage modulation. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/95598

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Qiu, Junyi. “Analysis of transistor laser intra-cavity photon-assisted tunneling for direct voltage modulation.” 2016. Thesis, University of Illinois – Urbana-Champaign. Accessed January 24, 2021. http://hdl.handle.net/2142/95598.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Qiu, Junyi. “Analysis of transistor laser intra-cavity photon-assisted tunneling for direct voltage modulation.” 2016. Web. 24 Jan 2021.

Vancouver:

Qiu J. Analysis of transistor laser intra-cavity photon-assisted tunneling for direct voltage modulation. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2016. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/2142/95598.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Qiu J. Analysis of transistor laser intra-cavity photon-assisted tunneling for direct voltage modulation. [Thesis]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/95598

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

27. Brennan, Marissa C. INVESTIGATION OF LASER ULTRASONIC EVALUATION FOR USE AS AN IN SITU PROCESS MONITORING TOOL FOR LASER-BASED DIRECTED ENERGY DEPOSITION.

Degree: 2018, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/15744mxb1033

► Directed energy deposition (DED) processes commonly form lack of fusion defects when adjacent passes do not achieve consistent overlap. Insufficient fusion is rooted to the… (more)

▼ Directed energy deposition (DED) processes commonly form lack of fusion defects when adjacent passes do not achieve consistent overlap. Insufficient fusion is rooted to the behavior of the molten pool which is influenced by high temperature thermo-physical material properties. Internal defects have the tendency to be detrimental to mechanical properties. Thus, expensive and time-consuming methods such as post-processing (HIP) are required to repair defects in additively manufactured (AM) parts, otherwise components are scrapped. Efforts to minimize post-processing has been redirected towards developing in situ monitoring techniques based on nondestructive evaluation (NDE) methods to detect defects during processing. Knowledge of defect location and size can then be used as a guide for correcting defects prior to removing the build from the chamber. While thermal and optical techniques have been extensively integrated for in situ measurements, information can only be obtained for the exposed build layer. However, techniques based on ultrasound are capable of detecting subsurface features. Noncontact, laser ultrasonics offers the unique capability of operating in-line and within close proximity to the DED head which makes it attractive for in situ monitoring of the build process. An assessment was completed for choosing laser ultrasonics as feasible tool for in situ monitoring. The feasibility of the laser ultrasonic system was evaluated by measuring the minimum defect diameter and maximum defect depth that could be detected for DED builds processed with intentional lack of fusion conditions. Defect measurements were then cross-correlated to optical microscopy and x-ray computed tomography (CT) which have been extensively used as acceptable techniques for characterizing defects in AM components. Intentional defects were formed upon selecting processing parameters to control melt pool shape and size. Lack of fusion defects were produced by altering hatch spacing, powder flow, and power to replicate defects typically formed during processing for titanium, nickel superalloys, and precipitation hardened martensitic grade stainless steel alloys. X-ray CT results reported the majority of defects were between 0.50 mm and 0.75 mm in diameter, despite the hatch spacing or material. In addition, sphericity values between 0.35 and 0.50 were reported for the majority of defects formed. A general decreasing power law trend was observed upon plotting degree of sphericity as a function of defect diameter, despite the processing conditions and material selected. This concluded the lack of fusion defects formed were non-spherical and elongated in shape. A closer look at the volume percent porosity reported the highest percentages for builds processed with 3.56 mm hatch spacing and disrupted powder flow. A comparison of material conditions, however, indicated while Ti-6Al-4V showed several instances of lack of fusion between passes, Inconel® 718 and 17-4PH stainless steel builds featured most lack of fusion near the ends of the… Advisors/Committee Members: Todd Palmer, Thesis Advisor/Co-Advisor, Allison Michelle Beese, Committee Member, Clifford Jesse Lissenden III, Committee Member, Jayme Scot Keist, Committee Member.

Subjects/Keywords: Laser Ultrasonics; Ti-6Al-4V; Inconel 718; 17-4PH stainless steel; In situ; Directed Energy Deposition; Additive Manufacturing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Brennan, M. C. (2018). INVESTIGATION OF LASER ULTRASONIC EVALUATION FOR USE AS AN IN SITU PROCESS MONITORING TOOL FOR LASER-BASED DIRECTED ENERGY DEPOSITION. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/15744mxb1033

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Brennan, Marissa C. “INVESTIGATION OF LASER ULTRASONIC EVALUATION FOR USE AS AN IN SITU PROCESS MONITORING TOOL FOR LASER-BASED DIRECTED ENERGY DEPOSITION.” 2018. Thesis, Penn State University. Accessed January 24, 2021. https://submit-etda.libraries.psu.edu/catalog/15744mxb1033.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Brennan, Marissa C. “INVESTIGATION OF LASER ULTRASONIC EVALUATION FOR USE AS AN IN SITU PROCESS MONITORING TOOL FOR LASER-BASED DIRECTED ENERGY DEPOSITION.” 2018. Web. 24 Jan 2021.

Vancouver:

Brennan MC. INVESTIGATION OF LASER ULTRASONIC EVALUATION FOR USE AS AN IN SITU PROCESS MONITORING TOOL FOR LASER-BASED DIRECTED ENERGY DEPOSITION. [Internet] [Thesis]. Penn State University; 2018. [cited 2021 Jan 24]. Available from: https://submit-etda.libraries.psu.edu/catalog/15744mxb1033.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Brennan MC. INVESTIGATION OF LASER ULTRASONIC EVALUATION FOR USE AS AN IN SITU PROCESS MONITORING TOOL FOR LASER-BASED DIRECTED ENERGY DEPOSITION. [Thesis]. Penn State University; 2018. Available from: https://submit-etda.libraries.psu.edu/catalog/15744mxb1033

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Washington State University

28. [No author]. Soil Carbon Determination Using Rapid, Inexpensive, Non-destructive Spectroscopic Techniques .

Degree: 2012, Washington State University

URL: http://hdl.handle.net/2376/4668

► New methods are required to rapidly and accurately measure soil C at field- and landscape-scales to improve local, regional, and global soil C stock and… (more)

▼ New methods are required to rapidly and accurately measure soil C at field- and landscape-scales to improve local, regional, and global soil C stock and flux estimates. This research evaluated visible-near infrared diffuse reflectance spectroscopy (VisNIR) and laser-induced breakdown spectroscopy (LIBS) for non-destructive in situ soil carbon determination. `On-the-go' VisNIR has been proposed as a rapid and inexpensive tool for intensively mapping soil clay and organic carbon concentration. In a direct comparison, lab-based spectral data consistently provided greater prediction accuracy than on-the-go spectral data for Montana cropland soils. The current configuration of on-the-go VisNIR systems allows for rapid field scanning, however on-the-go soil processing could improve predictions. LIBS is an emerging elemental analysis technology with the potential to provide rapid, accurate, and precise analysis of soil constituents. We evaluated LIBS for measuring soil profile C in field-moist, intact soil cores. Results indicate that LIBS can be calibrated to accurately estimate and differentiate between soil total and inorganic C concentrations utilizing stoichiometric relationships between C and elements related to total and inorganic C in the soil matrix. The fundamental principles on which VisNIR and LIBS are based differ in regards to molecular and elemental spectroscopy, respectively, therefore integrating VisNIR and LIBS should theoretically improve soil C predictions compared to individual sensors. Integrating VisNIR and LIBS did not consistently improve soil profile C predictions over individual sensors. In general, SOC was not well characterized using VisNIR, LIBS, or combined VisNIR-LIBS for soils in this study, presumably due to challenges associated with scanning surfaces of intact soil cores, variable SOC chemistry, and lack of SOC variation. Considering the challenging conditions under which VisNIR and LIBS were tested, model calibrations and sensor integration performed admirably. Further testing of combined VisNIR-LIBS under more controlled soil conditions with samples containing greater SOC diversity is necessary to determine the technical potential of the method. Currently, results suggest that in situ VisNIR and LIBS may be best employed as field-stratification tools for targeted conventional soil C measurements. Ultimately, we envision a penetrometer-mounted, integrated VisNIR-LIBS sensor array for rapid soil elemental and molecular characterization at field- and landscape-scales. Advisors/Committee Members: Brown, David J (advisor).

Subjects/Keywords: Soil sciences; in situ; Laser-induced breakdown spectroscopy; regression shrinkage and variable selection; soil carbon; Visible-near infrared; diffuse reflectance spectroscopy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

author], [. (2012). Soil Carbon Determination Using Rapid, Inexpensive, Non-destructive Spectroscopic Techniques . (Thesis). Washington State University. Retrieved from http://hdl.handle.net/2376/4668

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

author], [No. “Soil Carbon Determination Using Rapid, Inexpensive, Non-destructive Spectroscopic Techniques .” 2012. Thesis, Washington State University. Accessed January 24, 2021. http://hdl.handle.net/2376/4668.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

author], [No. “Soil Carbon Determination Using Rapid, Inexpensive, Non-destructive Spectroscopic Techniques .” 2012. Web. 24 Jan 2021.

Vancouver:

author] [. Soil Carbon Determination Using Rapid, Inexpensive, Non-destructive Spectroscopic Techniques . [Internet] [Thesis]. Washington State University; 2012. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/2376/4668.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

author] [. Soil Carbon Determination Using Rapid, Inexpensive, Non-destructive Spectroscopic Techniques . [Thesis]. Washington State University; 2012. Available from: http://hdl.handle.net/2376/4668

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Washington

29. Zhou, Xuezhe. Synthesis, characterization, and laser refrigeration of rare-earth doped ﬂuoride nanostructures.

Degree: PhD, 2017, University of Washington

URL: http://hdl.handle.net/1773/40632

► Rare-earth (RE) doped materials with unique 4f electronic structures show special optical phenomena at the macro- and microscale, which are commonly studied through laser-mediated experiments.… (more)

▼ Rare-earth (RE) doped materials with unique 4f electronic structures show special optical phenomena at the macro- and microscale, which are commonly studied through laser-mediated experiments. Recently, RE doped nanocrystals have been intensively studied for various applications, including bioimaging, biolabeling, photodynamic therapy, catalysis, solar cells, color displays, light emitting diodes, low-threshold lasers, high temperature sensors, and many others. For the last ﬁve years in the Pauzauskie lab, I have been focusing on developing new methods for synthesizing and characterizing engineered micro- and nano-scale RE-doped nanocrystals for investigating the interaction of light with condensed matter, especially laser cooling through anti-Stokes ﬂuorescence. The main method utilized for laser cooling in the Pauzauskie lab is optical trapping with laser tweezers. A brief introduction to laser cooling and optical trapping is included in Chapter 1 of this thesis. The remaining chapters describe the development and characterization of diﬀerent phases of RE doped nanocrystals which can be optically trapped for nanoscale laser cooling and thermometry with laser tweezers. In Chapter 2, diﬀerent methods of synthesizing ﬂuoride nanocrystals are introduced and compared based on the requirements for the nanocrystals. A low-cost, scalable, and environmentally friendly hydrothermal method has been speciﬁcally introduced for fabricating both LiYF4 (YLF) and NaYF4 nanostructures. Due to the hermetic conditions inherent to hydrothermal synthesis, the growth mechanism of RE doped ﬂuoride nanocrystals is unclear. Chapter 3 presents a systematic study on the synthetic mechanism of hydrothermal synthesis of sodium yttrium ﬂuoride nanocrystals. Various cutting edge techniques, including ’in-situ’ TEM, EDS, XANES, EXAFS, and APT, are used to investigate the fundamental properties and growth mechanisms of RE doped ﬂuoride nanocrystals in both Chapter 2 and 3. Chapter 4 describes the ﬁrst experimental demonstration of laser cooling of Yb3+ doped YLF nanocrystals in aqueous media, which is explained by anti-Stokes ﬂuorescence. The Yb3+ ions inside the crystal absorb laser photons and emit a mean higher energy ﬂuorescence to extract heat from the crystal lattice. This unprecedented laser cooling in a condensed phase is achieved through home-built laser tweezers with a temperature extraction technique based on cold Brownian motion analysis. Furthermore, crystals of NaYF4, predicted to be a good host structure for laser cooling, are also experimentally proven for laser cooling in aqueous medium for the ﬁrst time. The ability to optically generate local refrigeration ﬁelds around individual nanocrystals promises to enable precise optical temperature control within integrated electronic/photonic/microﬂuidic circuits, as well as thermal modulation of basic biomolecular processes. In Chapter 5, nanoscale thermometry of RE doped ﬂuoride nanocrystals using spectroscopy methods has been applied on both single nanocrystals and ensembles of… Advisors/Committee Members: Pauzauskie, Peter (advisor).

Subjects/Keywords: in-situ TEM; laser cooling; nanoparticle; optical trapping; photonics; rare earth; Materials Science; Optics; Nanotechnology; Materials science and engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhou, X. (2017). Synthesis, characterization, and laser refrigeration of rare-earth doped ﬂuoride nanostructures. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/40632

Chicago Manual of Style (16^th Edition):

Zhou, Xuezhe. “Synthesis, characterization, and laser refrigeration of rare-earth doped ﬂuoride nanostructures.” 2017. Doctoral Dissertation, University of Washington. Accessed January 24, 2021. http://hdl.handle.net/1773/40632.

MLA Handbook (7^th Edition):

Zhou, Xuezhe. “Synthesis, characterization, and laser refrigeration of rare-earth doped ﬂuoride nanostructures.” 2017. Web. 24 Jan 2021.

Vancouver:

Zhou X. Synthesis, characterization, and laser refrigeration of rare-earth doped ﬂuoride nanostructures. [Internet] [Doctoral dissertation]. University of Washington; 2017. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1773/40632.

Council of Science Editors:

Zhou X. Synthesis, characterization, and laser refrigeration of rare-earth doped ﬂuoride nanostructures. [Doctoral Dissertation]. University of Washington; 2017. Available from: http://hdl.handle.net/1773/40632

Louisiana State University

30. McNally, Lacey R. Chromosomal localization of a proinsulin transgene inserted with a transposon-based vector into Japanese quail, Coturnix coturnix.

Degree: PhD, Veterinary Pathology and Pathobiology, 2004, Louisiana State University

URL: etd-04122004-171939 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1321

► The overall goals of this research were to develop a reproducible method of detecting stable DNA insertion into Japanese quail and provide a method for… (more)

Subjects/Keywords: primed in situ hybridization; laser microdissection; transgene; Japanese quail

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

McNally, L. R. (2004). Chromosomal localization of a proinsulin transgene inserted with a transposon-based vector into Japanese quail, Coturnix coturnix. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-04122004-171939 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1321

Chicago Manual of Style (16^th Edition):

McNally, Lacey R. “Chromosomal localization of a proinsulin transgene inserted with a transposon-based vector into Japanese quail, Coturnix coturnix.” 2004. Doctoral Dissertation, Louisiana State University. Accessed January 24, 2021. etd-04122004-171939 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1321.

MLA Handbook (7^th Edition):

McNally, Lacey R. “Chromosomal localization of a proinsulin transgene inserted with a transposon-based vector into Japanese quail, Coturnix coturnix.” 2004. Web. 24 Jan 2021.

Vancouver:

McNally LR. Chromosomal localization of a proinsulin transgene inserted with a transposon-based vector into Japanese quail, Coturnix coturnix. [Internet] [Doctoral dissertation]. Louisiana State University; 2004. [cited 2021 Jan 24]. Available from: etd-04122004-171939 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1321.

Council of Science Editors:

McNally LR. Chromosomal localization of a proinsulin transgene inserted with a transposon-based vector into Japanese quail, Coturnix coturnix. [Doctoral Dissertation]. Louisiana State University; 2004. Available from: etd-04122004-171939 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1321

Open Access Theses and Dissertations