subject:( Noise Source Identification)

1. Khatami, Iman. Free-field inlet / outlet noise identification on aircraft engines using microphones array.

Degree: PhD, Génie mécanique, 2015, Université de Sherbrooke

URL: http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_7581.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/7581/1/Khatami_Iman_PhD_2014.pdf

► Abstract : This thesis considers the discrimination of inlet / exhaust noise of aero-engines in free-field static tests using far-field microphone arrays. Various techniques are… (more)

▼ Abstract : This thesis considers the discrimination of inlet / exhaust noise of aero-engines in free-field static tests using far-field microphone arrays. Various techniques are compared for this problem, including classical beamforming (CB), regularized inverse method (Tikhonov regularization), LI - generalized inverse beamforming (LI-GIB), clean-PSF, clean-SC and two novel methods which are called hybrid method and clean-hybrid. The classical beamforming method is disadvantaged due to its need for a high number of measurement microphones in accordance with the requirements. Similarly, the inverse method is disadvantaged due to their need of having a priori source information. The classical Tikhonov regularization provides improvements in solution stability, however continues to be disadvantaged due to its requirement of imposing a stronger penalty for undetected source positions. Coherent and incoherent sources are resolved by LI-generalized inverse beamforming (L1-GIB). This algorithm can distinguish the multipole sources as well as the monopoles sources. However, source identification by LI-generalized inverse beamforming takes much time and requires a PC with high memory. The hybrid method is a new regularization method which involves the use of an a priori beamforming measurement to define a data-dependent discrete smoothing norm for the regularization of the inverse problem. Compared to the classical beamforming and the inverse modeling, the hybrid (beamforming regularization) approach provides improved source strength maps without substantial added complexity. Although the hybrid method rather solves the disadvantage of the former methods, the application of this method for identification of weaker sources in the presence of the strong sources isn't satisfactory. This can be explained by the large penalization being applied to the weaker source in the hybrid method, which results in underestimation of source strength for this source. To overcome this defect, the clean-SC method and the proposed clean-hybrid method, which is a combination of the hybrid method and the clean-SC, are applied. These methods remove the effect of the strong sources in source power maps to identify the weaker sources. The proposed methods which represent the main contribution of this thesis show promising results and opens new research avenues. Theoretical study of all approaches is performed for various sources and configurations of array. In order to validate the theoretical study, several laboratory experiments are conducted at Universito de Sherbrooke. The proposed methods have further been applied to the measured noise data from a Pratt & Whitney Canada turbo-fan engine and have been observed to provide better spatial resolution and solution robustness with a limited number of measurement microphones compared to the existing methods. Advisors/Committee Members: Berry, Alain.

Subjects/Keywords: Identification de source; Bruit de moteur; Inverse; Hybride; Hybride-Clean; Formation de voie; Source identification; Engine noise; Beamforming; Clean-hybrid

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APA (6^th Edition):

Khatami, I. (2015). Free-field inlet / outlet noise identification on aircraft engines using microphones array. (Doctoral Dissertation). Université de Sherbrooke. Retrieved from http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_7581.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/7581/1/Khatami_Iman_PhD_2014.pdf

Chicago Manual of Style (16^th Edition):

Khatami, Iman. “Free-field inlet / outlet noise identification on aircraft engines using microphones array.” 2015. Doctoral Dissertation, Université de Sherbrooke. Accessed December 11, 2019. http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_7581.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/7581/1/Khatami_Iman_PhD_2014.pdf.

MLA Handbook (7^th Edition):

Khatami, Iman. “Free-field inlet / outlet noise identification on aircraft engines using microphones array.” 2015. Web. 11 Dec 2019.

Vancouver:

Khatami I. Free-field inlet / outlet noise identification on aircraft engines using microphones array. [Internet] [Doctoral dissertation]. Université de Sherbrooke; 2015. [cited 2019 Dec 11]. Available from: http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_7581.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/7581/1/Khatami_Iman_PhD_2014.pdf.

Council of Science Editors:

Khatami I. Free-field inlet / outlet noise identification on aircraft engines using microphones array. [Doctoral Dissertation]. Université de Sherbrooke; 2015. Available from: http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_7581.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/7581/1/Khatami_Iman_PhD_2014.pdf

NSYSU

2. Tsai, Meng-Fan. Acoustical Simulation and Analysis of Shipping Noise in Kaohsiung Harbor.

Degree: Master, IAMPUT, 2014, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0801114-152727

► One of the ocean noise sources comes from shipping. The noise is produced by shipâs propulsion mechanism and propeller, which is raising the noise energy… (more)

Subjects/Keywords: Acoustical Model; Ships Noise; Field Measurement; Source Level; Automatic Identification System (AIS); Kaohsiung Harbor

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APA (6^th Edition):

Tsai, M. (2014). Acoustical Simulation and Analysis of Shipping Noise in Kaohsiung Harbor. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0801114-152727

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):

Tsai, Meng-Fan. “Acoustical Simulation and Analysis of Shipping Noise in Kaohsiung Harbor.” 2014. Thesis, NSYSU. Accessed December 11, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0801114-152727.

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

MLA Handbook (7^th Edition):

Tsai, Meng-Fan. “Acoustical Simulation and Analysis of Shipping Noise in Kaohsiung Harbor.” 2014. Web. 11 Dec 2019.

Vancouver:

Tsai M. Acoustical Simulation and Analysis of Shipping Noise in Kaohsiung Harbor. [Internet] [Thesis]. NSYSU; 2014. [cited 2019 Dec 11]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0801114-152727.

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

Council of Science Editors:

Tsai M. Acoustical Simulation and Analysis of Shipping Noise in Kaohsiung Harbor. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0801114-152727

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

Brno University of Technology

3. Halama, Jakub. Metodika pro bezkontaktní diagnostiku automobilových tlumičů .

Degree: 2018, Brno University of Technology

URL: http://hdl.handle.net/11012/81410

► Diplomová práce se zabývá aplikací akustických metod za účelem hodnocení technického stavu tlumičů. Analýza akustických projevů při provozu tlumiče vede k definování nové bezkontaktní diagnostické… (more)

▼ Diplomová práce se zabývá aplikací akustických metod za účelem hodnocení technického stavu tlumičů. Analýza akustických projevů při provozu tlumiče vede k definování nové bezkontaktní diagnostické metodiky, která je schopna identifikovat stav tlumičů. První část práce se věnuje hlukovým projevům tlumiče, které jsou zapříčiněny neplynulým tlumením. Dále jsou popsány metody pro lokalizaci zdrojů hluku dostupné na Ústavu konstruování – je vysvětlen princip jejich činnosti, výhody a omezení. Na základě těchto informací je vybrána vhodná metoda, která je dále využita v experimentální části. Následně je na několika typech tlumičů vyvoláno zavzdušnění a stav úplného odběru oleje společně s poškozením pláště tlumiče. Hlukové projevy jsou měřeny mikrofonním polem a zvukoměrem, z naměřených dat jsou vypočteny akustické mapy, frekvenční spektra a grafy synchronní filtrace. Z rozdílů mezi akustickými projevy jednotlivých stavů je pro daný tlumič definováno vhodné diagnostické kritérium. V závěrečné části jsou diskutovány získané výsledky, na jejichž základě je formulovaná obecná diagnostická metodika, aplikovatelná na jakýkoliv typ konstrukce tlumiče.; The diploma thesis deals with the application of acoustic methods for evaluating the technical condition of the shock absorbers. Analysis of acoustic radiation during damping operation leads to the definition of a new non-contact diagnostic methodology that can determine the condition of the shock absorbers. The first part of the thesis focuses on the noise radiation of the shock absorbers, which is caused by discontinuous dumping. Further, the methods for the noise source localization available at The Institute of Machine and Industrial Design are described – with their functionalities, advantages and limitations. Based on all the information, an appropriate method is selected and used in the experimental part of this work. Then, aeration and removing the full volume of oil with damage of the shock absorber tube are caused (induced) on several types of the shocks. Noise radiation is measured by a microphone array and by a sound meter; the acoustic maps, frequency spectra and the synchronous filtration graphs are calculated from the measured data. From the differences in the acoustic radiations of each shock condition, a suitable diagnostic criterion for a specific shock absorber is defined. The final part discusses obtained results. Based on these results, a general diagnostic methodology, applicable to any type of shock absorber, is formulated. Advisors/Committee Members: Klapka, Milan (advisor).

Subjects/Keywords: Automobilový tlumič; lokalizace zdrojů hluku; akustická diagnostika; zavzdušnění; kavitace; Automotive Shock Absorber; Noise Source Identification; Acoustic Diagnostics; Aeration; Cavitation

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

APA (6^th Edition):

Halama, J. (2018). Metodika pro bezkontaktní diagnostiku automobilových tlumičů . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/81410

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):

Halama, Jakub. “Metodika pro bezkontaktní diagnostiku automobilových tlumičů .” 2018. Thesis, Brno University of Technology. Accessed December 11, 2019. http://hdl.handle.net/11012/81410.

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

MLA Handbook (7^th Edition):

Halama, Jakub. “Metodika pro bezkontaktní diagnostiku automobilových tlumičů .” 2018. Web. 11 Dec 2019.

Vancouver:

Halama J. Metodika pro bezkontaktní diagnostiku automobilových tlumičů . [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/11012/81410.

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

Council of Science Editors:

Halama J. Metodika pro bezkontaktní diagnostiku automobilových tlumičů . [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/81410

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

University of Manitoba

4. Nasr Esfahani, Ali. Detection and classification of partial discharge sources under variable frequency and air pressure.

Degree: Electrical and Computer Engineering, 2018, University of Manitoba

URL: http://hdl.handle.net/1993/33747

► With the development of electrical apparatus in more-electric aircraft (MEA), demand for higher electric power is increasing rapidly. In turn, this requires a higher voltage… (more)

Subjects/Keywords: Partial discharge source identification

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

APA (6^th Edition):

Nasr Esfahani, A. (2018). Detection and classification of partial discharge sources under variable frequency and air pressure. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/33747

Chicago Manual of Style (16^th Edition):

Nasr Esfahani, Ali. “Detection and classification of partial discharge sources under variable frequency and air pressure.” 2018. Masters Thesis, University of Manitoba. Accessed December 11, 2019. http://hdl.handle.net/1993/33747.

MLA Handbook (7^th Edition):

Nasr Esfahani, Ali. “Detection and classification of partial discharge sources under variable frequency and air pressure.” 2018. Web. 11 Dec 2019.

Vancouver:

Nasr Esfahani A. Detection and classification of partial discharge sources under variable frequency and air pressure. [Internet] [Masters thesis]. University of Manitoba; 2018. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/1993/33747.

Council of Science Editors:

Nasr Esfahani A. Detection and classification of partial discharge sources under variable frequency and air pressure. [Masters Thesis]. University of Manitoba; 2018. Available from: http://hdl.handle.net/1993/33747

Loughborough University

5. Braun, Michael E. Sound source contributions for the prediction of vehicle pass-by noise.

Degree: PhD, 2014, Loughborough University

URL: https://dspace.lboro.ac.uk/2134/16322 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.631628

► Current European legislation aims to limit vehicle noise emissions since many people are exposed to road traffic noise in urban areas. Vehicle pass-by noise is… (more)

Subjects/Keywords: 629.2; Vehicle noise source characteristics; Vehicle pass-by noise test; Pass-by noise prediction; Engine noise; Exhaust noise; Tyre/road noise

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

APA (6^th Edition):

Braun, M. E. (2014). Sound source contributions for the prediction of vehicle pass-by noise. (Doctoral Dissertation). Loughborough University. Retrieved from https://dspace.lboro.ac.uk/2134/16322 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.631628

Chicago Manual of Style (16^th Edition):

Braun, Michael E. “Sound source contributions for the prediction of vehicle pass-by noise.” 2014. Doctoral Dissertation, Loughborough University. Accessed December 11, 2019. https://dspace.lboro.ac.uk/2134/16322 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.631628.

MLA Handbook (7^th Edition):

Braun, Michael E. “Sound source contributions for the prediction of vehicle pass-by noise.” 2014. Web. 11 Dec 2019.

Vancouver:

Braun ME. Sound source contributions for the prediction of vehicle pass-by noise. [Internet] [Doctoral dissertation]. Loughborough University; 2014. [cited 2019 Dec 11]. Available from: https://dspace.lboro.ac.uk/2134/16322 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.631628.

Council of Science Editors:

Braun ME. Sound source contributions for the prediction of vehicle pass-by noise. [Doctoral Dissertation]. Loughborough University; 2014. Available from: https://dspace.lboro.ac.uk/2134/16322 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.631628

Loughborough University

6. Braun, Michael E. Sound source contributions for the prediction of vehicle pass-by noise.

Degree: PhD, 2014, Loughborough University

URL: http://hdl.handle.net/2134/16322

► Current European legislation aims to limit vehicle noise emissions since many people are exposed to road traffic noise in urban areas. Vehicle pass-by noise is… (more)

Subjects/Keywords: 629.2; Vehicle noise source characteristics; Vehicle pass-by noise test; Pass-by noise prediction; Engine noise; Exhaust noise; Tyre/road noise

Record Details Similar Records Cite « Share

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

APA (6^th Edition):

Braun, M. E. (2014). Sound source contributions for the prediction of vehicle pass-by noise. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/16322

Chicago Manual of Style (16^th Edition):

Braun, Michael E. “Sound source contributions for the prediction of vehicle pass-by noise.” 2014. Doctoral Dissertation, Loughborough University. Accessed December 11, 2019. http://hdl.handle.net/2134/16322.

MLA Handbook (7^th Edition):

Braun, Michael E. “Sound source contributions for the prediction of vehicle pass-by noise.” 2014. Web. 11 Dec 2019.

Vancouver:

Braun ME. Sound source contributions for the prediction of vehicle pass-by noise. [Internet] [Doctoral dissertation]. Loughborough University; 2014. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/2134/16322.

Council of Science Editors:

Braun ME. Sound source contributions for the prediction of vehicle pass-by noise. [Doctoral Dissertation]. Loughborough University; 2014. Available from: http://hdl.handle.net/2134/16322

Georgia Tech

7. Breen, Nicholas Paul. Source location of subsonic and supersonic jets of various geometeries via acoustic beamforming.

Degree: PhD, Aerospace Engineering, 2018, Georgia Tech

URL: http://hdl.handle.net/1853/61181

► Over the years, the need to understand and reduce aircraft noise emissions has led numerous researchers to apply various source location techniques to jet noise.… (more)

▼ Over the years, the need to understand and reduce aircraft noise emissions has led numerous researchers to apply various source location techniques to jet noise. Prior to 1985, several methods for determining jet-noise source locations were explored: acoustic mirrors, microphone arrays, two-microphone methods, causality correlation and coherence techniques, nearfield contour surveys, and automated source breakdown. More recently there have been developments in the microphone array, notably acoustic beamforming, and two-microphone method techniques. Many of the older techniques require significant amount of time to acquire data at each jet condition; this requirement is often caused by the necessity to move microphones in order to obtain source locations at all frequencies. The acoustic beamformer does not need to be moved during the acquisition of data, resulting in very rapid tests compared to other source-location methods. Upon examination of prior studies containing jet noise source location measurements, it is clear that there are a few areas in the field that need additional work: (1) no study has compared the results of the acoustic beamforming method with another method using the same nozzles and facilities, (2) no study has been performed that analyzes the effects of differing nozzle geometry, and hence the nozzle exit boundary layer, on the jet noise source location, (3) no study has performed a detailed analysis of the noise source distributions of supersonic jets, and (4) no study has examined the noise source distribution of twin jets and the effect of separation distance on the said distribution. The goal of this thesis is to systematically address these areas with the use of source location measurements, schlieren flow visualization, farfield spectra, and jet velocity measurements. The source location measurements are primarily acquired using an acoustic beamformer. Jet velocity measurements include both nozzle exit boundary layer profiles and downstream velocity profiles and are obtained with the use of boundary layer probes and particle imaging velocimetry. Advisors/Committee Members: Ahuja, Krish (advisor), Sankar, Lakshmi (committee member), Ruzzene, Massimo (committee member), Sabra, Karim (committee member), Gavin, Joe (committee member), Bridges, James (committee member).

Subjects/Keywords: Beamforming; Source Location; Jet Noise; Nearfield Contours

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

APA (6^th Edition):

Breen, N. P. (2018). Source location of subsonic and supersonic jets of various geometeries via acoustic beamforming. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/61181

Chicago Manual of Style (16^th Edition):

Breen, Nicholas Paul. “Source location of subsonic and supersonic jets of various geometeries via acoustic beamforming.” 2018. Doctoral Dissertation, Georgia Tech. Accessed December 11, 2019. http://hdl.handle.net/1853/61181.

MLA Handbook (7^th Edition):

Breen, Nicholas Paul. “Source location of subsonic and supersonic jets of various geometeries via acoustic beamforming.” 2018. Web. 11 Dec 2019.

Vancouver:

Breen NP. Source location of subsonic and supersonic jets of various geometeries via acoustic beamforming. [Internet] [Doctoral dissertation]. Georgia Tech; 2018. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/1853/61181.

Council of Science Editors:

Breen NP. Source location of subsonic and supersonic jets of various geometeries via acoustic beamforming. [Doctoral Dissertation]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/61181

8. Le Magueresse, Thibaut. Approche unifiée multidimensionnelle du problème d'identification acoustique inverse : Unified multidimensional approach to the inverse problem for acoustic source identification.

Degree: Docteur es, Acoustique, 2016, Lyon

URL: http://www.theses.fr/2016LYSEI010

►

La caractérisation expérimentale de sources acoustiques est l'une des étapes essentielles pour la réduction des nuisances sonores produites par les machines industrielles. L'objectif de la… (more)

▼

La caractérisation expérimentale de sources acoustiques est l'une des étapes essentielles pour la réduction des nuisances sonores produites par les machines industrielles. L'objectif de la thèse est de mettre au point une procédure complète visant à localiser et à quantifier des sources acoustiques stationnaires ou non sur un maillage surfacique par la rétro-propagation d'un champ de pression mesuré par un réseau de microphones. Ce problème inverse est délicat à résoudre puisqu'il est généralement mal-conditionné et sujet à de nombreuses sources d'erreurs. Dans ce contexte, il est capital de s'appuyer sur une description réaliste du modèle de propagation acoustique direct. Dans le domaine fréquentiel, la méthode des sources équivalentes a été adaptée au problème de l'imagerie acoustique dans le but d'estimer les fonctions de transfert entre les sources et l'antenne, en prenant en compte le phénomène de diffraction des ondes autour de l'objet d'intérêt. Dans le domaine temporel, la propagation est modélisée comme un produit de convolution entre la source et une réponse impulsionnelle décrite dans le domaine temps-nombre d'onde. Le caractère sous-déterminé du problème acoustique inverse implique d'utiliser toutes les connaissances a priori disponibles sur le champ sources. Il a donc semblé pertinent d'employer une approche bayésienne pour résoudre ce problème. Des informations a priori disponibles sur les sources acoustiques ont été mises en équation et il a été montré que la prise en compte de leur parcimonie spatiale ou de leur rayonnement omnidirectionnel pouvait améliorer significativement les résultats. Dans les hypothèses formulées, la solution du problème inverse s'écrit sous la forme régularisée de Tikhonov. Le paramètre de régularisation a été estimé par une approche bayésienne empirique. Sa supériorité par rapport aux méthodes communément utilisées dans la littérature a été démontrée au travers d'études numériques et expérimentales. En présence de fortes variabilités du rapport signal à bruit au cours du temps, il a été montré qu'il est nécessaire de mettre à jour sa valeur afin d'obtenir une solution satisfaisante. Finalement, l'introduction d'une variable manquante au problème reflétant la méconnaissance partielle du modèle de propagation a permis, sous certaines conditions, d'améliorer l'estimation de l'amplitude complexe des sources en présence d'erreurs de modèle. Les développements proposés ont permis de caractériser, in situ, la puissance acoustique rayonnée par composant d'un groupe motopropulseur automobile par la méthode de la focalisation bayésienne dans le cadre du projet Ecobex. Le champ acoustique cyclo-stationnaire généré par un ventilateur automobile a finalement été analysé par la méthode d'holographie acoustique de champ proche temps réel.

Experimental characterization of acoustic sources is one of the essential steps for reducing noise produced by industrial machinery. The aim of the thesis is to develop a complete procedure to localize and quantify both stationary and non-stationary…

Advisors/Committee Members: Antoni, Jérôme (thesis director).

Subjects/Keywords: Acoustique; Acoustique appliquée; Imagerie acoustique; Identification de sources; Problèmes inverses; Approche bayésienne; Régularisation par approche Bayésienne; Régularisation; Acoustic; Applied acoustics; Acoustical imaging; Noise source identification; Inverse method; Bayesian approach; Bayesian regularization; Regularization; 620.210 72

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

APA (6^th Edition):

Le Magueresse, T. (2016). Approche unifiée multidimensionnelle du problème d'identification acoustique inverse : Unified multidimensional approach to the inverse problem for acoustic source identification. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2016LYSEI010

Chicago Manual of Style (16^th Edition):

Le Magueresse, Thibaut. “Approche unifiée multidimensionnelle du problème d'identification acoustique inverse : Unified multidimensional approach to the inverse problem for acoustic source identification.” 2016. Doctoral Dissertation, Lyon. Accessed December 11, 2019. http://www.theses.fr/2016LYSEI010.

MLA Handbook (7^th Edition):

Le Magueresse, Thibaut. “Approche unifiée multidimensionnelle du problème d'identification acoustique inverse : Unified multidimensional approach to the inverse problem for acoustic source identification.” 2016. Web. 11 Dec 2019.

Vancouver:

Le Magueresse T. Approche unifiée multidimensionnelle du problème d'identification acoustique inverse : Unified multidimensional approach to the inverse problem for acoustic source identification. [Internet] [Doctoral dissertation]. Lyon; 2016. [cited 2019 Dec 11]. Available from: http://www.theses.fr/2016LYSEI010.

Council of Science Editors:

Le Magueresse T. Approche unifiée multidimensionnelle du problème d'identification acoustique inverse : Unified multidimensional approach to the inverse problem for acoustic source identification. [Doctoral Dissertation]. Lyon; 2016. Available from: http://www.theses.fr/2016LYSEI010

Penn State University

9. Gorny, Lee James. SOUND ATTENUATIONS OF AXIAL FAN BLADE TONES USING FLOW-DRIVEN TUNABLE RESONATOR ARRAYS.

Degree: PhD, Mechanical Engineering, 2009, Penn State University

URL: https://etda.libraries.psu.edu/catalog/9535

► Flow-excited, tunable quarter-wavelength resonators can be integrated into the shrouds of ducted subsonic axial fans. This study explores their effectiveness in reducing propagations of tonal… (more)

▼ Flow-excited, tunable quarter-wavelength resonators can be integrated into the shrouds of ducted subsonic axial fans. This study explores their effectiveness in reducing propagations of tonal noise by means of acoustic wave cancellation. Resonators are a non-intrusive method of generating a secondary sound field near the plane of a rotor. As they can be strategically tuned to reduce radiated noise at the blade passage frequency (BPF) and its harmonics, resonators can be useful for a variety of applications to quiet existing and future turbomachinery. Experiments have demonstrated that a single quarter wave resonator is effective in reducing unidirectional plane wave propagations for long wavelength ducted applications while an array is effective for shorter wavelength or un-ducted facilities where shrouded fans are used. Testing conducted at Center for Acoustics and Vibrations (CAV) at the Pennsylvania State University the Deutsches Zentrum für Luft und Raumfahrt (DLR) in Berlin, Germany demonstrated that resonator arrays were effective in attenuating shorter wavelength plane-wave and higher order modal propagations of blade tone noise. A chiller fan enclosure, constructed in the CAV laboratory emulated an industrial chiller in its operation. Using this facility, resonators were observed to attenuate blade tone noise from a non-ideal ducted geometry. The approaches used in this study evolved from Helmholtz resonators to conventional quarter wave tubes, to mouth tunable resonators, and finally to back-wall tunable resonators. These developments in tuning allowed for independent control of a resonator’s magnitude and phase of the secondary sound field produced by the resonators. It was demonstrated that the use of two tunable resonator chambers oriented axially on either side of the blade region enables a dipole-like secondary sound field to be passively generated and bi-directional attenuations of plane wave noise to be achieved. Tonal attenuations of 28 dB were attained and BPF tones were reduced to less than 5 dB from the broadband noise floor for each case discussed above. In parallel with experimental work, analytical models were developed to effectively model and predict optimal resonator configurations for a given fan in operation. Interactions between resonators and the driving pressure field from the rotor blades are modeled using transmission line (TL) theory. Blade tone acoustic pressure is obtained using a finite element method (FEM) propagation code. By combining of these two methods, a resonator configuration that achieves optimal attenuation can be numerically obtained. The use of resonators has been shown to significantly attenuate fan noise in the conditions explored in the considered experiments. Numerical modeling has shown consistency in the response of flow driven resonators and their. These results indicate a strong potential for active control of fan noise using resonators and an approach to applying this control is presented.

Subjects/Keywords: Rotor Stator; Dipole Source; Flow Driven Source; Axial; Resonators; Fan Noise; Interaction Noise

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

APA (6^th Edition):

Gorny, L. J. (2009). SOUND ATTENUATIONS OF AXIAL FAN BLADE TONES USING FLOW-DRIVEN TUNABLE RESONATOR ARRAYS. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/9535

Chicago Manual of Style (16^th Edition):

Gorny, Lee James. “SOUND ATTENUATIONS OF AXIAL FAN BLADE TONES USING FLOW-DRIVEN TUNABLE RESONATOR ARRAYS.” 2009. Doctoral Dissertation, Penn State University. Accessed December 11, 2019. https://etda.libraries.psu.edu/catalog/9535.

MLA Handbook (7^th Edition):

Gorny, Lee James. “SOUND ATTENUATIONS OF AXIAL FAN BLADE TONES USING FLOW-DRIVEN TUNABLE RESONATOR ARRAYS.” 2009. Web. 11 Dec 2019.

Vancouver:

Gorny LJ. SOUND ATTENUATIONS OF AXIAL FAN BLADE TONES USING FLOW-DRIVEN TUNABLE RESONATOR ARRAYS. [Internet] [Doctoral dissertation]. Penn State University; 2009. [cited 2019 Dec 11]. Available from: https://etda.libraries.psu.edu/catalog/9535.

Council of Science Editors:

Gorny LJ. SOUND ATTENUATIONS OF AXIAL FAN BLADE TONES USING FLOW-DRIVEN TUNABLE RESONATOR ARRAYS. [Doctoral Dissertation]. Penn State University; 2009. Available from: https://etda.libraries.psu.edu/catalog/9535

10. Khatami, Iman. Free-field inlet / outlet noise identification on aircraft engines using microphones array .

Degree: 2015, Université de Sherbrooke

URL: http://hdl.handle.net/11143/7581

► Abstract : This thesis considers the discrimination of inlet / exhaust noise of aero-engines in free-field static tests using far-field microphone arrays. Various techniques are… (more)

▼ Abstract : This thesis considers the discrimination of inlet / exhaust noise of aero-engines in free-field static tests using far-field microphone arrays. Various techniques are compared for this problem, including classical beamforming (CB), regularized inverse method (Tikhonov regularization), LI - generalized inverse beamforming (LI-GIB), clean-PSF, clean-SC and two novel methods which are called hybrid method and clean-hybrid. The classical beamforming method is disadvantaged due to its need for a high number of measurement microphones in accordance with the requirements. Similarly, the inverse method is disadvantaged due to their need of having a priori source information. The classical Tikhonov regularization provides improvements in solution stability, however continues to be disadvantaged due to its requirement of imposing a stronger penalty for undetected source positions. Coherent and incoherent sources are resolved by LI-generalized inverse beamforming (L1-GIB). This algorithm can distinguish the multipole sources as well as the monopoles sources. However, source identification by LI-generalized inverse beamforming takes much time and requires a PC with high memory. The hybrid method is a new regularization method which involves the use of an a priori beamforming measurement to define a data-dependent discrete smoothing norm for the regularization of the inverse problem. Compared to the classical beamforming and the inverse modeling, the hybrid (beamforming regularization) approach provides improved source strength maps without substantial added complexity. Although the hybrid method rather solves the disadvantage of the former methods, the application of this method for identification of weaker sources in the presence of the strong sources isn't satisfactory. This can be explained by the large penalization being applied to the weaker source in the hybrid method, which results in underestimation of source strength for this source. To overcome this defect, the clean-SC method and the proposed clean-hybrid method, which is a combination of the hybrid method and the clean-SC, are applied. These methods remove the effect of the strong sources in source power maps to identify the weaker sources. The proposed methods which represent the main contribution of this thesis show promising results and opens new research avenues. Theoretical study of all approaches is performed for various sources and configurations of array. In order to validate the theoretical study, several laboratory experiments are conducted at Universito de Sherbrooke. The proposed methods have further been applied to the measured noise data from a Pratt & Whitney Canada turbo-fan engine and have been observed to provide better spatial resolution and solution robustness with a limited number of measurement microphones compared to the existing methods. Advisors/Committee Members: Berry, Alain (advisor).

Subjects/Keywords: Identification de source; Bruit de moteur; Inverse; Hybride; Hybride-Clean; Formation de voie; Source identification; Engine noise; Beamforming; Clean-hybrid

…4 l.3.2 Task (Il): Theoretical Study of Source Identification Algorithms… …7 2.2 Literature Review of Noise Identification of Aircraft Engines… …80 4.3.8 Comput:ational Cost of the Source Identification Methods… …79 Table 4.1 O.Computational cost of the Source identification methods… …26 VI 3 CHAPTER 3 SOURCE IDENTlFICATION METHODS usrNG MlCROPHONE ARRA Y…

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

APA (6^th Edition):

Khatami, I. (2015). Free-field inlet / outlet noise identification on aircraft engines using microphones array . (Doctoral Dissertation). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/7581

Chicago Manual of Style (16^th Edition):

Khatami, Iman. “Free-field inlet / outlet noise identification on aircraft engines using microphones array .” 2015. Doctoral Dissertation, Université de Sherbrooke. Accessed December 11, 2019. http://hdl.handle.net/11143/7581.

MLA Handbook (7^th Edition):

Khatami, Iman. “Free-field inlet / outlet noise identification on aircraft engines using microphones array .” 2015. Web. 11 Dec 2019.

Vancouver:

Khatami I. Free-field inlet / outlet noise identification on aircraft engines using microphones array . [Internet] [Doctoral dissertation]. Université de Sherbrooke; 2015. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/11143/7581.

Council of Science Editors:

Khatami I. Free-field inlet / outlet noise identification on aircraft engines using microphones array . [Doctoral Dissertation]. Université de Sherbrooke; 2015. Available from: http://hdl.handle.net/11143/7581

NSYSU

11. Chen, Mei-Hsia. Source Identification and Fugitive Emission Quantification of VOCs in Petrochemical Complexes by Using Open-Path Fourier Transform Infrared Spectrometry.

Degree: PhD, Environmental Engineering, 2015, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719115-152642

► The petrochemical complex examined in this work includes a great variety of facilities and factories that emit various odorants. Fugitive emissions are one of the… (more)

▼ The petrochemical complex examined in this work includes a great variety of facilities and factories that emit various odorants. Fugitive emissions are one of the largest sources of volatile organic compounds (VOCs) from petrochemical and chemical plants. However, how to identiufy and quantify the total fugitive VOC emissions from numerous and mostly inaccessible sources is a time consuming and costly task. A stationary open-path Fourier transform infrared (OPFTIR) system can be used for routine VOC and odor monitoring. However, when odor episodes occur, only multiple mobile OPFTIR systems are able to identify the odorant sources effectively and efficiently. In this study, N,N-dimethyl formamide (DMF) was found to be the most commonly detected odorant emitted from the investigated petrochemical complex by routine monitoring of a stationary OPFTIR system. Then the sequential deployments of a pair of mobile OPFTIR systems were carried out both upwind and downwind of the different sections of the focal area. The pollution rose plots derived from the data obtained by the pair of mobile OPFTIR systems identified the DMF sources. By conducting correlation analyses on the data obtained from the mobile OPFTIR situated at the downwind location of the DMF emission sources, we found that besides DMF, the dry PU synthetic leather process of plant B was also the major odorant source of 2-butanone, ethyl acetate and isopropanol. The source identification measure developed in this study can be used to clarify possible odorant sources not only for petrochemical industrial complexes but also for other areas associated with various emission sources. This study also presents a feasible approach to quantify the fugitive VOC emissions by integrating OPFTIR measurements and the well-developed Industrial Source Complex Short Term Model (ISCST3). A mobile OPFTIR system was set up for 190 hours in the downwind location of a 1,3-butadiene manufacturing process, which has unidentified fugitive sources and should be responsible for the elevated atmospheric 1,3-butadiene concentrations. Wind speeds and directions were found to be the most important factors in the dispersion of the emissions. Therefore, when using trial and error to predict the fugitive 1,3-butadiene emission rates, we divided the field measurement data based on the wind directions and excluded that obtained during lower wind speeds. Then the correlation coefficients between the field data (from the mobile OPFTIR system) and the modeling data (from the ISCST3) were found to be up to 0.529, and the slope of the correlation equation was close to unity. Therefore, integrating the OPFTIR measurement and ISCST3 is a feasible approach to predict the amount of fugitive VOC emissions. Advisors/Committee Members: Lin-Chi Wang (chair), Chung-Hsuang Hung (chair), Chung-Shin Yuan (committee member), Wen-Jhy Lee (chair), Shui-Jen Chen (chair).

Subjects/Keywords: Fugitive emissions; OPFTIR; ISCST3; VOCs; Source identification

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APA (6^th Edition):

Chen, M. (2015). Source Identification and Fugitive Emission Quantification of VOCs in Petrochemical Complexes by Using Open-Path Fourier Transform Infrared Spectrometry. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719115-152642

Chicago Manual of Style (16^th Edition):

Chen, Mei-Hsia. “Source Identification and Fugitive Emission Quantification of VOCs in Petrochemical Complexes by Using Open-Path Fourier Transform Infrared Spectrometry.” 2015. Doctoral Dissertation, NSYSU. Accessed December 11, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719115-152642.

MLA Handbook (7^th Edition):

Chen, Mei-Hsia. “Source Identification and Fugitive Emission Quantification of VOCs in Petrochemical Complexes by Using Open-Path Fourier Transform Infrared Spectrometry.” 2015. Web. 11 Dec 2019.

Vancouver:

Chen M. Source Identification and Fugitive Emission Quantification of VOCs in Petrochemical Complexes by Using Open-Path Fourier Transform Infrared Spectrometry. [Internet] [Doctoral dissertation]. NSYSU; 2015. [cited 2019 Dec 11]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719115-152642.

Council of Science Editors:

Chen M. Source Identification and Fugitive Emission Quantification of VOCs in Petrochemical Complexes by Using Open-Path Fourier Transform Infrared Spectrometry. [Doctoral Dissertation]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719115-152642

12. Ihara, Mizuki. Statistical Approach to the Single-Channel Sound Source Extraction : シングルチャネル音源抽出への統計的アプローチ; シングルチャネルオンゲンチュウシュツエノトウケイテキアプローチ.

Degree: Nara Institute of Science and Technology / 奈良先端科学技術大学院大学

URL: http://hdl.handle.net/10061/5546

Subjects/Keywords: sound source identification

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

APA (6^th Edition):

Ihara, M. (n.d.). Statistical Approach to the Single-Channel Sound Source Extraction : シングルチャネル音源抽出への統計的アプローチ; シングルチャネルオンゲンチュウシュツエノトウケイテキアプローチ. (Thesis). Nara Institute of Science and Technology / 奈良先端科学技術大学院大学. Retrieved from http://hdl.handle.net/10061/5546

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ihara, Mizuki. “Statistical Approach to the Single-Channel Sound Source Extraction : シングルチャネル音源抽出への統計的アプローチ; シングルチャネルオンゲンチュウシュツエノトウケイテキアプローチ.” Thesis, Nara Institute of Science and Technology / 奈良先端科学技術大学院大学. Accessed December 11, 2019. http://hdl.handle.net/10061/5546.

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ihara, Mizuki. “Statistical Approach to the Single-Channel Sound Source Extraction : シングルチャネル音源抽出への統計的アプローチ; シングルチャネルオンゲンチュウシュツエノトウケイテキアプローチ.” Web. 11 Dec 2019.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Ihara M. Statistical Approach to the Single-Channel Sound Source Extraction : シングルチャネル音源抽出への統計的アプローチ; シングルチャネルオンゲンチュウシュツエノトウケイテキアプローチ. [Internet] [Thesis]. Nara Institute of Science and Technology / 奈良先端科学技術大学院大学; [cited 2019 Dec 11]. Available from: http://hdl.handle.net/10061/5546.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Council of Science Editors:

Ihara M. Statistical Approach to the Single-Channel Sound Source Extraction : シングルチャネル音源抽出への統計的アプローチ; シングルチャネルオンゲンチュウシュツエノトウケイテキアプローチ. [Thesis]. Nara Institute of Science and Technology / 奈良先端科学技術大学院大学; Available from: http://hdl.handle.net/10061/5546

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Deakin University

13. Nyhof, Luke. Biomedical signal filtering for noisy environments.

Degree: 2014, Deakin University

URL: http://hdl.handle.net/10536/DRO/DU:30079016

► Luke's work addresses issue of robustly attenuating multi-source noise from surface EEG signals using a novel Adaptive-Multiple-Reference Least-Means-Squares filter (AMR-LMS). In practice, the filter successfully… (more)

Subjects/Keywords: medical imaging; electroencephalograph (EEG); multi-source noise; noise filter

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APA (6^th Edition):

Nyhof, L. (2014). Biomedical signal filtering for noisy environments. (Thesis). Deakin University. Retrieved from http://hdl.handle.net/10536/DRO/DU:30079016

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):

Nyhof, Luke. “Biomedical signal filtering for noisy environments.” 2014. Thesis, Deakin University. Accessed December 11, 2019. http://hdl.handle.net/10536/DRO/DU:30079016.

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

MLA Handbook (7^th Edition):

Nyhof, Luke. “Biomedical signal filtering for noisy environments.” 2014. Web. 11 Dec 2019.

Vancouver:

Nyhof L. Biomedical signal filtering for noisy environments. [Internet] [Thesis]. Deakin University; 2014. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/10536/DRO/DU:30079016.

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

Council of Science Editors:

Nyhof L. Biomedical signal filtering for noisy environments. [Thesis]. Deakin University; 2014. Available from: http://hdl.handle.net/10536/DRO/DU:30079016

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

University of California – Irvine

14. Truong, Alexander Dang Quang. Experimental and Theoretical Investigation of the Emission and Diffraction of Discrete Tone Noise Generated from the Exhaust of a Ducted Fan.

Degree: Mechanical and Aerospace Engineering, 2018, University of California – Irvine

URL: http://www.escholarship.org/uc/item/6x314206

► In modern turbofan engines powering commercial aircraft, the fan is becoming the dominant source of noise at takeoff and landing. Understanding and modeling of the… (more)

▼ In modern turbofan engines powering commercial aircraft, the fan is becoming the dominant source of noise at takeoff and landing. Understanding and modeling of the fan noise source, and the interaction of the emitted sound with the airframe, are critical for the design of quiet aircraft. Of particular importance is discrete tone noise radiating from the fan exhaust whose propagation can be shielded by the airframe in advanced aircraft configurations. Current prediction methods for fan noise and its propagation require tremendous amount of computational resources and time. Experiments in large-scale facilities are extremely expensive. There is a need for efficient approaches to experimentally investigate and model fan noise, thus enabling parametric studies that can identify optimal configurations. This study combines novel small-scale experiments with low-order, physics-based modeling of the fan noise source towards achieving the aforementioned goal. The experimental effort entailed the design and construction of a subscale ducted fan rig that includes all the relevant components of the turbofan engine and simulates accurately the sound emission generated by the fan of such engines. The ducted fan includes a nacelle, rotor, and stators, all fabricated using advanced stereolithographic or metal casting methods. It is powered by a high-performance DC motor and achieves rotor tip Mach number of around 0.61 and fan pressure ratio of 1.157, values compatible with the operation of high-bypass turbofan engines. Acoustic diagnostic was conducted inside an anechoic chamber using far-field and near-field phased arrays consisting of 23 microphones. Installation of a rectangular flat plate representing the airframe below the ducted fan recreates complex phenomenon such as scattering off the obstacle, and diffraction around the shield. Addition of the rectangular plate shield generated complex trends in the tonal content and demonstrates the large potential to reduce noise through shielding by the airframe. Tones below the shielding surface were well attenuated, while tones emitted in the aft direction were unchanged. Acquired acoustic data were used to formulate the wavepacket noise model and shielding simulations. The theoretical effort comprises the following steps: (a) extraction of the harmonic content of the measured noise through use of the Vold-Kalman filter; (b) modeling of the aft-emitted fan noise source as a cylindrical wavepacket with azimuthal modes inferred from the Tyler-Sofrin theory; (c) determination of wavepacket shape parameters through least-squares matching of the measured cross-spectral density in the near field and the far field at a given frequency; and (d) propagation and diffraction of the sound from the modeled source using the Boundary Element Method (BEM), with comparisons to measured data. Far-field source parameterization shows that the wavepacket can be modeled as a short cylindrical disturbance surrounding the exit of the nozzle. The resulting modeled sound field captures…

Subjects/Keywords: Aerospace engineering; Acoustics; acoustics; fan noise; noise source model; propulsion airframe integration; tubofan; wavepacket

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APA (6^th Edition):

Truong, A. D. Q. (2018). Experimental and Theoretical Investigation of the Emission and Diffraction of Discrete Tone Noise Generated from the Exhaust of a Ducted Fan. (Thesis). University of California – Irvine. Retrieved from http://www.escholarship.org/uc/item/6x314206

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):

Truong, Alexander Dang Quang. “Experimental and Theoretical Investigation of the Emission and Diffraction of Discrete Tone Noise Generated from the Exhaust of a Ducted Fan.” 2018. Thesis, University of California – Irvine. Accessed December 11, 2019. http://www.escholarship.org/uc/item/6x314206.

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

MLA Handbook (7^th Edition):

Truong, Alexander Dang Quang. “Experimental and Theoretical Investigation of the Emission and Diffraction of Discrete Tone Noise Generated from the Exhaust of a Ducted Fan.” 2018. Web. 11 Dec 2019.

Vancouver:

Truong ADQ. Experimental and Theoretical Investigation of the Emission and Diffraction of Discrete Tone Noise Generated from the Exhaust of a Ducted Fan. [Internet] [Thesis]. University of California – Irvine; 2018. [cited 2019 Dec 11]. Available from: http://www.escholarship.org/uc/item/6x314206.

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

Council of Science Editors:

Truong ADQ. Experimental and Theoretical Investigation of the Emission and Diffraction of Discrete Tone Noise Generated from the Exhaust of a Ducted Fan. [Thesis]. University of California – Irvine; 2018. Available from: http://www.escholarship.org/uc/item/6x314206

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

NSYSU

15. Wu, Pei-Yu. Physicochemical Fingerprints of Particulate Matter Emitted from Stacks in a Steel Plant.

Degree: Master, Environmental Engineering, 2014, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724114-130243

► Kaohsiung Lin-hai Industrial Park is an industrial complex and one of the largest industrial areas in Taiwan. Iron works is one of the important stationary… (more)

▼ Kaohsiung Lin-hai Industrial Park is an industrial complex and one of the largest industrial areas in Taiwan. Iron works is one of the important stationary sources in Kaohsiung Lin-hai Industrial Park, including an integrated iron and steel plant and several electric arc furnace plants, in which main air pollutants emitted are particulate matter. Currently the stack emission data is rather rare for the steel plants in Taiwan. Thus, this study aims to collect particulate matter emitted from the stacks of steel plants and further analyze its physical and chemical properties, in order to establish the elemental indicator(s) of different manufacturing processes. The results could provide valuable stack emission data to the environmental related governments and research institutes, for establishing air pollution control strategies and identifying potential emission sources. In this study, we initially reviewed literature related to particulate matter emitted from the stacks of steel plants, and then conducted stack sampling and chemical analysis of particulate matter emitted from the stacks in Kaohsiung Lin-hai Industrial Park. This study applied a method for sampling and analysis of particulate matter from a stack (NIEA A101.73C) issued by The National Institute of Environmental Analysis for stacks sampling, and further correlated the characteristics of particulate matter with emission sources in the steel plant industrial park. The air pollution control devices set up in the front of the stacks in the iron and steel manufacturing processes include fabric filter, electrostatic precipitator, and flue gas denitrification (FGDN) device, which mostly operated with the stack emission standard. The concentration of particulate matter emitted from the manufacturing processes ranged between 2.0-62.9 mg/Nm3, which were lower than the stack emission standards and previously detected data. Results obtained from water-soluble ionic species of particulate matter in the flue gases emitted from stacks showed that the most abundant anion was SO42- and followed by Cl- and F-, while the most abundant cation was Ca2+ and followed by Na+ and K+. The molar ratio of Cl- to Na+ (Cl/Na) ranged between 0.43 and 2.43, while the molar ratio of anion to cation (A/C) ranged between 0.38 and 1.18. Elemental analysis of metals showed that Al was the major metallic element. In addition, the averaged OC concentration was higher than EC, and the OC/EC ratio ranged between 0.68 and 4.58. Among all chemical species, SO42- was the major species of particulate matter in the steel manufacturing processes. It probably due to raw materials containing sulfur content, which could be oxidized to form sulfur dioxide and further converted to sulfate. Moreover, desulfurizer was generally added to remove impurities in the steelmaking processes, resulting in high concentration of SO42-. Using the recycling fines containing chloride and potassium ions caused higher concentrations of K+ and Cl- in the sintering process while compared to other manufacturing processes.… Advisors/Committee Members: Rui-Ren Chen (chair), Chung-Shin Yuan (committee member), Wei-Hsiang Chen (chair).

Subjects/Keywords: chemical analysis; stationary pollution source; particulate matter; Steel industry; physicochemical fingerprint; source identification

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APA (6^th Edition):

Wu, P. (2014). Physicochemical Fingerprints of Particulate Matter Emitted from Stacks in a Steel Plant. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724114-130243

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):

Wu, Pei-Yu. “Physicochemical Fingerprints of Particulate Matter Emitted from Stacks in a Steel Plant.” 2014. Thesis, NSYSU. Accessed December 11, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724114-130243.

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

MLA Handbook (7^th Edition):

Wu, Pei-Yu. “Physicochemical Fingerprints of Particulate Matter Emitted from Stacks in a Steel Plant.” 2014. Web. 11 Dec 2019.

Vancouver:

Wu P. Physicochemical Fingerprints of Particulate Matter Emitted from Stacks in a Steel Plant. [Internet] [Thesis]. NSYSU; 2014. [cited 2019 Dec 11]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724114-130243.

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

Council of Science Editors:

Wu P. Physicochemical Fingerprints of Particulate Matter Emitted from Stacks in a Steel Plant. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724114-130243

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

16. Callahan, Michael J. Estimating Channel Identification Quality in Passive Radar Using LMS Algorithms.

Degree: PhD, Engineering PhD, 2017, Wright State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=wright1503508289044109

► Passive bistatic radar can be an attractive choice relative to monostatic radar because itprovides the ability to operate covertly; immunity to jamming and interference; the… (more)

▼ Passive bistatic radar can be an attractive choice relative to monostatic radar because itprovides the ability to operate covertly; immunity to jamming and interference; the abilityto operate outside of traditional radar bands; and reduced cost.The benefits of noise waveforms versus classic radar waveforms such as linear frequencymodulation (LFM) are discussed in the literature. Noise waveforms, with theirthumbtack ambiguity functions, are ideal for use in non-cooperative passive radar. Sincemany digital waveforms are randomized to make their spectra approximately white, noise-likewaveforms may be readily available for opportunistic use by non-cooperative passiveradar receivers. For instance, the literature points out that digital television transmittersoffer a powerful, well-defined signal with sufficient bandwidth for reasonable precisionin range and are noise-like, thereby allowing for good, consistent range compression andDoppler estimation of targets.Much of the literature assumes that the transmitted noise (or noise-like) waveform iswhite (flat spectrum) over a finite bandwidth, and with good reason. However, some illuminatorsmay emit waveforms that are not white.When the transmitted waveform’s spectrum is colored (correlated), the cross-correlationprocess is likely to produce unacceptably high sidelobes. Meanwhile, LMS may producemore acceptable sidelobes. Until now, no theoretical expressions for the SNR at the outputof the LMS family of algorithms existed in the literature for cases in which variants of theLMS algorithm are used to process colored Gaussian noise input data.The original contribution of this research is as follows. An equation is derived whichpredicts the theoretical output SNR when processing colored Gaussian noise input data usingconventional LMS, valid at steady-state. Theoretical results have been corroborated bysimulation results, and this contribution has been completed. The equation which predictsthe steady-state theoretical output SNR when conventional LMS processes colored Gaussiannoise input data should also apply at steady-state when block LMS and fast block LMS(fast LMS) are used to perform the processing.Additionally, promising simulation results using L1 LMS are presented, which highlightthe previously known fact that L1 LMS’s performance when processing sparse inputdata may be robust even when the transmit waveform’s spectrum is notched, while resultsfrom other algorithms (including conventional LMS) noticeably degrade. These simulationresults prompt future research to extend the contribution documented herein by deriving thesteady-state theoretical output SNR when processing sparse colored Gaussian noise inputdata using L1 LMS. Advisors/Committee Members: Rigling, Brian (Committee Chair).

Subjects/Keywords: Electrical Engineering; channel identification; passive radar; noise radar; noise-like radar; least mean square; LMS

15 more images…

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APA (6^th Edition):

Callahan, M. J. (2017). Estimating Channel Identification Quality in Passive Radar Using LMS Algorithms. (Doctoral Dissertation). Wright State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=wright1503508289044109

Chicago Manual of Style (16^th Edition):

Callahan, Michael J. “Estimating Channel Identification Quality in Passive Radar Using LMS Algorithms.” 2017. Doctoral Dissertation, Wright State University. Accessed December 11, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1503508289044109.

MLA Handbook (7^th Edition):

Callahan, Michael J. “Estimating Channel Identification Quality in Passive Radar Using LMS Algorithms.” 2017. Web. 11 Dec 2019.

Vancouver:

Callahan MJ. Estimating Channel Identification Quality in Passive Radar Using LMS Algorithms. [Internet] [Doctoral dissertation]. Wright State University; 2017. [cited 2019 Dec 11]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1503508289044109.

Council of Science Editors:

Callahan MJ. Estimating Channel Identification Quality in Passive Radar Using LMS Algorithms. [Doctoral Dissertation]. Wright State University; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1503508289044109

17. Hela Ladin, Hilmi Bin. Research of noise and vibration analysis for structures involving transfer path and sound source : 伝達経路および音源を有する構造物に対する振動・騒音解析に関する研究; デンタツケイロオヨビオンゲンオユウスルコウゾウブツニタイスルシンドウ・ソウオンカイセキニカンスルケンキュウ; 伝達経路および音源を有する構造物に対する振動騒音解析に関する研究.

Degree: 博士(工学), 2016, Doshisha University / 同志社大学

URL: https://doors.doshisha.ac.jp/duar/repository/ir/23048/?lang=0 ; http://dx.doi.org/10.14988/di.2017.0000016309

►

本論文は，従来よりも信頼性や効率が良く実用的に構造物の振動・騒音を低減することを目指して，実験および解析技術に対する新たなアプローチを確立することを目的としている．そのために，統計的エネルギー解析法と伝達経路解析法を統合することで，両者の入力を相互利用可能な手法を提案し，構造物の振動・騒音の低減を支援するための，実験および解析手法を構築した．

In this thesis, we have established new theoretical approaches as well as some basic practical applications in the development of noise and vibration analysis… (more)

Subjects/Keywords: Noise and Vibration; Transfer Pass Analysis; Sound Source

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APA (6^th Edition):

Hela Ladin, H. B. (2016). Research of noise and vibration analysis for structures involving transfer path and sound source : 伝達経路および音源を有する構造物に対する振動・騒音解析に関する研究; デンタツケイロオヨビオンゲンオユウスルコウゾウブツニタイスルシンドウ・ソウオンカイセキニカンスルケンキュウ; 伝達経路および音源を有する構造物に対する振動騒音解析に関する研究. (Thesis). Doshisha University / 同志社大学. Retrieved from https://doors.doshisha.ac.jp/duar/repository/ir/23048/?lang=0 ; http://dx.doi.org/10.14988/di.2017.0000016309

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):

Hela Ladin, Hilmi Bin. “Research of noise and vibration analysis for structures involving transfer path and sound source : 伝達経路および音源を有する構造物に対する振動・騒音解析に関する研究; デンタツケイロオヨビオンゲンオユウスルコウゾウブツニタイスルシンドウ・ソウオンカイセキニカンスルケンキュウ; 伝達経路および音源を有する構造物に対する振動騒音解析に関する研究.” 2016. Thesis, Doshisha University / 同志社大学. Accessed December 11, 2019. https://doors.doshisha.ac.jp/duar/repository/ir/23048/?lang=0 ; http://dx.doi.org/10.14988/di.2017.0000016309.

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

MLA Handbook (7^th Edition):

Hela Ladin, Hilmi Bin. “Research of noise and vibration analysis for structures involving transfer path and sound source : 伝達経路および音源を有する構造物に対する振動・騒音解析に関する研究; デンタツケイロオヨビオンゲンオユウスルコウゾウブツニタイスルシンドウ・ソウオンカイセキニカンスルケンキュウ; 伝達経路および音源を有する構造物に対する振動騒音解析に関する研究.” 2016. Web. 11 Dec 2019.

Vancouver:

Hela Ladin HB. Research of noise and vibration analysis for structures involving transfer path and sound source : 伝達経路および音源を有する構造物に対する振動・騒音解析に関する研究; デンタツケイロオヨビオンゲンオユウスルコウゾウブツニタイスルシンドウ・ソウオンカイセキニカンスルケンキュウ; 伝達経路および音源を有する構造物に対する振動騒音解析に関する研究. [Internet] [Thesis]. Doshisha University / 同志社大学; 2016. [cited 2019 Dec 11]. Available from: https://doors.doshisha.ac.jp/duar/repository/ir/23048/?lang=0 ; http://dx.doi.org/10.14988/di.2017.0000016309.

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

Council of Science Editors:

Hela Ladin HB. Research of noise and vibration analysis for structures involving transfer path and sound source : 伝達経路および音源を有する構造物に対する振動・騒音解析に関する研究; デンタツケイロオヨビオンゲンオユウスルコウゾウブツニタイスルシンドウ・ソウオンカイセキニカンスルケンキュウ; 伝達経路および音源を有する構造物に対する振動騒音解析に関する研究. [Thesis]. Doshisha University / 同志社大学; 2016. Available from: https://doors.doshisha.ac.jp/duar/repository/ir/23048/?lang=0 ; http://dx.doi.org/10.14988/di.2017.0000016309

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

Penn State University

18. Lee, Seongkyu. Prediction of Acoustic Scattering in the Time Domain and its Applications to Rotorcraft Noise.

Degree: PhD, Aerospace Engineering, 2009, Penn State University

URL: https://etda.libraries.psu.edu/catalog/9323

► This work aims at the development of a numerical method for the analysis of acoustic scattering in the time domain and its applications to rotorcraft… (more)

▼ This work aims at the development of a numerical method for the analysis of acoustic scattering in the time domain and its applications to rotorcraft noise. This purpose is achieved by developing two independent methods: 1) an analytical formulation of the pressure gradient for an arbitrary moving source and 2) a time-domain moving equivalent source method. First, the analytical formulation for the pressure gradient is developed to fulfill the boundary condition on a scattering surface to account for arbitrary moving incident sources. A semi-analytical formulation was derived from the gradient of the Ffowcs Williams-Hawkings (FW-H) equation. This formulation needs to calculate the observer time differentiation outside the integrals numerically. A numerical algorithm is developed to implement this formulation in an aeroacoustic prediction code. A new analytical formulation is presented in the thesis. In this formulation, the time differentiation is taken inside the integrals analytically. This formulation avoids the numerical time differentiation with respect to the observer time, which is computationally more efficient. The acoustic pressure gradient predicted by these two formulations is validated through comparison with available exact solutions for a stationary and moving monopole sources. The agreement between the predictions and exact solutions is excellent. One of the advantages of this analytic formulation is that it efficiently provides the boundary condition for the acoustic scattering of sound generated from an arbitrary moving source, such as rotating blades, which undergoes rotation, flapping and lead-lag motions. The formulation is applied to the rotor noise problems for two model rotors (UH-1H and HART-I). For HART-I rotor, CFD/CSD coupling was used to provide unsteady aerodynamics and trim solutions of the blade motion. A purely numerical approach is compared with the analytical formulations. The agreement between the analytical formulations and the numerical method is excellent for both stationary and moving observer cases. The formulation for the pressure gradient is first used to predict acoustic scattering in the frequency domain. The prediction is validated with the exact solution for acoustic scattering generated by a monopole source by a stationary sphere. A Bo105 helicopter and a notional heavy lift quad tilt rotor are considered to demonstrate a potential significance of acoustic scattering of rotorcraft noise. NASA's Fast Scattering Code is used for the frequency-domain scattering solver. Secondly, a new and efficient time domain acoustic scattering method using a moving equivalent source is developed to predict acoustic scattering in the time domain efficiently. The time-domain method provides entire frequency solutions in a single computation and is able to predict acoustic scattering of aperiodic signals. The method assumes an acoustically rigid surface for a scattering body and neglects the refraction effect by non-uniform flow around the scattering body. The pressure-gradient boundary…

Subjects/Keywords: acoustic scattering; helicopter noise; equivalent source method; pressure gradient; aeroacoustics

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

APA (6^th Edition):

Lee, S. (2009). Prediction of Acoustic Scattering in the Time Domain and its Applications to Rotorcraft Noise. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/9323

Chicago Manual of Style (16^th Edition):

Lee, Seongkyu. “Prediction of Acoustic Scattering in the Time Domain and its Applications to Rotorcraft Noise.” 2009. Doctoral Dissertation, Penn State University. Accessed December 11, 2019. https://etda.libraries.psu.edu/catalog/9323.

MLA Handbook (7^th Edition):

Lee, Seongkyu. “Prediction of Acoustic Scattering in the Time Domain and its Applications to Rotorcraft Noise.” 2009. Web. 11 Dec 2019.

Vancouver:

Lee S. Prediction of Acoustic Scattering in the Time Domain and its Applications to Rotorcraft Noise. [Internet] [Doctoral dissertation]. Penn State University; 2009. [cited 2019 Dec 11]. Available from: https://etda.libraries.psu.edu/catalog/9323.

Council of Science Editors:

Lee S. Prediction of Acoustic Scattering in the Time Domain and its Applications to Rotorcraft Noise. [Doctoral Dissertation]. Penn State University; 2009. Available from: https://etda.libraries.psu.edu/catalog/9323

University of Missouri – Columbia

19. Yao, Jia. Study of low noise high throughput microchip device for electrochemical measurement from single cells.

Degree: 2012, University of Missouri – Columbia

URL: http://hdl.handle.net/10355/35200

► We are developing transparent multi- electrochemical electrode arrays on microchips in order to automate measurement of quantal exocytosis of oxidizable transmitter from individual vesicles. In… (more)

Subjects/Keywords: quantal exocytosis; noise source; microchip electrodes; multiplexing approach

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APA (6^th Edition):

Yao, J. (2012). Study of low noise high throughput microchip device for electrochemical measurement from single cells. (Thesis). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/35200

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):

Yao, Jia. “Study of low noise high throughput microchip device for electrochemical measurement from single cells.” 2012. Thesis, University of Missouri – Columbia. Accessed December 11, 2019. http://hdl.handle.net/10355/35200.

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

MLA Handbook (7^th Edition):

Yao, Jia. “Study of low noise high throughput microchip device for electrochemical measurement from single cells.” 2012. Web. 11 Dec 2019.

Vancouver:

Yao J. Study of low noise high throughput microchip device for electrochemical measurement from single cells. [Internet] [Thesis]. University of Missouri – Columbia; 2012. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/10355/35200.

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

Council of Science Editors:

Yao J. Study of low noise high throughput microchip device for electrochemical measurement from single cells. [Thesis]. University of Missouri – Columbia; 2012. Available from: http://hdl.handle.net/10355/35200

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

20. Vestlund, Hanne. Development of a Method for GC/MS Analysis of PAHs and Alkylated PAHs for Use in Characterization and Source Identification of PAH Contaminated Sites.

Degree: Science and Technology, 2014, Örebro University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-42008

►

Polycyclic aromatic hydrocarbons (PAHs) are toxic and carcinogenic environmental contaminants originating from different sources; petrogenic, pyrogenic or biogenic. Depending on the source of contamination… (more)

▼

Polycyclic aromatic hydrocarbons (PAHs) are toxic and carcinogenic environmental contaminants originating from different sources; petrogenic, pyrogenic or biogenic. Depending on the source of contamination there will be different ratios of PAHs and the effects on the environment will differ. Petrogenic sources will be higher in concentration of alkyl substituted PAHs (APAHs) while pyrogenic sources will be higher in parent PAHs. In the present study a GC/MS method was developed to separate and calibrate PAHs, dibenzothiophenes and alkyl substituted PAHs in a mix containing 49 standards. The method was able to differentiate between PAHs and APAHs with the same mass number; up to six different compounds with the same mass number was separated. The developed method was used to analyse six different soil samples from various contamination sites. PAHs, APAHs and dibenzothiophenes were identified and quantified in all samples. In order to establish the source of contamination, the distribution pattern, the ratio between different PAHs, and the ratio between APAHs and parent PAHs were used. There was a higher ratio of APAHs/PAHs and a lower ratio between the parent PAHs in the soil samples from sites contaminated with oils compared to the other samples, indicating petrogenic source.

Polycykliska aromatiska kolväten (PAH) är giftiga och cancerframkallande miljögifter som härstammar från olika källor; petrogena, pyrogena eller biogena. Olika föroreningskällor kommer att ha olika förhållanden av PAH och effekterna på miljön kommer att skilja. Petrogena källor innehåller högre koncentrationer av alkylsubstituerade PAH (APAH) medan pyrogena källor kommer att ha högre koncentration av PAH. I denna studie har en GC/MS-metod utvecklats för att separera och kalibrera PAH, dibensotiofener och alkylsubstituerade PAH i en blandning innehållande 49 standarder. Metoden kunde skilja mellan PAH och alkylsubstituerade PAH med samma masstal; upp till sex olika föreningar med samma masstal särskildes. Den utvecklade metoden användes för att analysera sex olika jordprover från olika föroreningsplatser. PAH, APAH och dibensotiofener identifierades och kvantifieras i samtliga prover. För att fastställa föroreningskällan användes fördelningsmönstret för APAH och PAH, förhållandet mellan olika PAH och ration mellan APAH och PAH. Det fanns en högre kvot APAH/PAH i jordprover från områden som var förorenade med olja, vilket indikerar på petrogena föroreningskällor.

Subjects/Keywords: PAHs; Alkylated PAHs; GC/MS; source identification; Chemical Sciences; Kemi

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

APA (6^th Edition):

Vestlund, H. (2014). Development of a Method for GC/MS Analysis of PAHs and Alkylated PAHs for Use in Characterization and Source Identification of PAH Contaminated Sites. (Thesis). Örebro University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-42008

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):

Vestlund, Hanne. “Development of a Method for GC/MS Analysis of PAHs and Alkylated PAHs for Use in Characterization and Source Identification of PAH Contaminated Sites.” 2014. Thesis, Örebro University. Accessed December 11, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-42008.

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

MLA Handbook (7^th Edition):

Vestlund, Hanne. “Development of a Method for GC/MS Analysis of PAHs and Alkylated PAHs for Use in Characterization and Source Identification of PAH Contaminated Sites.” 2014. Web. 11 Dec 2019.

Vancouver:

Vestlund H. Development of a Method for GC/MS Analysis of PAHs and Alkylated PAHs for Use in Characterization and Source Identification of PAH Contaminated Sites. [Internet] [Thesis]. Örebro University; 2014. [cited 2019 Dec 11]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-42008.

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

Council of Science Editors:

Vestlund H. Development of a Method for GC/MS Analysis of PAHs and Alkylated PAHs for Use in Characterization and Source Identification of PAH Contaminated Sites. [Thesis]. Örebro University; 2014. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-42008

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

NSYSU

21. Jhang, Yi-Min. Tempospatial Distribution and Source Identification of Atmospheric Mercury surrounding the Taiwan Strait.

Degree: Master, Environmental Engineering, 2014, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0631114-015806

► The Taiwan Strait is a densely populated and industrially developed area, where a large number of mercury is emitted to its atmosphere. Asian dust storms,… (more)

▼ The Taiwan Strait is a densely populated and industrially developed area, where a large number of mercury is emitted to its atmosphere. Asian dust storms, biomass burning, and northeastern Monsoons frequently occurred in the spring and winter. It could lead to a large number of atmospheric mercury and anthropogenic air pollutants across the Taiwan Strait from long-range transportation, which could cause poor ambient air quality of the Taiwan Strait. This study aimed to measure the speciation and concentration of atmospheric mercury, and further investigated their tempospatial distribution. The concentrations of total gaseous mercury (TGM) and particulate mercury (Hgp) were measured at six sampling sites surrounding the Taiwan Strait. A standard method for sampling and analyzing mercury in air (NIEA Method A304.10C) announced by the National Institute of Environmental Analysis (NIEA), mostly adopted from USEPA Method IO-5, was applied for the measurement of TGM and Hgp. This study also sampled TGM and Hgp in a sampling vessel (R/V Ocean Researcher III) navigated in the Taiwan Strait, and developed a KCl-coated annular denuder to sample reactive gaseous mercury (RGM) in the east side of the Taiwan Strait, and further investigated the tempospatial distribution of atmospheric mercury concentration. In addition, this study applied a NOAA-HYSPLIT Model and a Global Fire Map to figure out the transportation routes of polluted air mass by a backward trajectory, a fire spot map, and the correlation analysis of mercury concentration with meteorological parameters and criteria air pollutants. The results showed that the concentration of TGM and Hgp measured at six sites surrounding the Taiwan Strait were 4.56Â±0.35 ng/m3 and 0.17Â±0.02 ng/m3 with the range of 3.22-5.84 ng/m3 and 0.06-0.25 ng/m3, respectively, and were ordered as : spring >winter > fall > summer. Moreover, the highest TGM and Hgp concentration was observed at the Xiamen Xiang-Ann site. Atmospheric mercury apportioned as 95.70~ 98.34% TGM and 1.66~4.35% Hgp. The emission of Hgp came mainly from metropolitan areas and only small part of them emitted from industrial areas. Total atmospheric mercury apportioned as 1.34~1.79% RGM. RGM concentration were ordered as : Kaohsiung Gushan > Taichung Sha-Lu > New Taipei City Sandiaojiao. The results indicated that the RGM concentration at Kaohsiung Gushan was higher than other sites. While measured in the sampling vessel, the atmospheric mercury in the Taiwan Strait was mainly transported from the North China and mainlandÂ´s coastal areas. Results obtained from backward trajectory simulation and meteorological data showed that, in summer, the air masses transported toward the Taiwan Strait was mainly come from the South China Sea. The concentration of TGM and Hgp in summer appeared to be relatively lower than those in other seasons. However, the atmospheric mercury levels surrounding the Taiwan Strait increased in fall, winter, and spring, while the air masses were transported from the Northeast Asia by northeastern… Advisors/Committee Members: Guey-Rong Sheu (chair), Shui-Jen Chen (chair), Chung-Shin Yuan (committee member), Guor-Cheng Fang (chair).

Subjects/Keywords: source identification; transportation routes; tempospatial distribution; speciated atmospheric mercury; Taiwan Strait

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

APA (6^th Edition):

Jhang, Y. (2014). Tempospatial Distribution and Source Identification of Atmospheric Mercury surrounding the Taiwan Strait. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0631114-015806

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):

Jhang, Yi-Min. “Tempospatial Distribution and Source Identification of Atmospheric Mercury surrounding the Taiwan Strait.” 2014. Thesis, NSYSU. Accessed December 11, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0631114-015806.

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

MLA Handbook (7^th Edition):

Jhang, Yi-Min. “Tempospatial Distribution and Source Identification of Atmospheric Mercury surrounding the Taiwan Strait.” 2014. Web. 11 Dec 2019.

Vancouver:

Jhang Y. Tempospatial Distribution and Source Identification of Atmospheric Mercury surrounding the Taiwan Strait. [Internet] [Thesis]. NSYSU; 2014. [cited 2019 Dec 11]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0631114-015806.

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

Council of Science Editors:

Jhang Y. Tempospatial Distribution and Source Identification of Atmospheric Mercury surrounding the Taiwan Strait. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0631114-015806

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

NSYSU

22. Chen, Ti-Wen. Temporospatial Distribution of Atmospheric Speciated Mercury and Their Chemical Characteristics at the Penghu Islands.

Degree: Master, Environmental Engineering, 2015, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802115-183304

► Taiwan is located at the eastern edge of the Eurasian Continent. Mercury accompaning with other air pollutants could be long-range transported to Japan, Korea, Hawaii,… (more)

▼ Taiwan is located at the eastern edge of the Eurasian Continent. Mercury accompaning with other air pollutants could be long-range transported to Japan, Korea, Hawaii, and even arrived the western coast of American Continent. Moreover, it could also cause potential impacts on Taiwan. Local and long-range transport emissions arising from different types of mercury may change its characteristics. Additionally, air passes through the cities emitted mercury-containing pollutants during the transportation process, resulting in the increase of atmospheric mercury concentration. This study aims to investigate the seasonal variation and source identification of atmospheric speciated mercury at the Penghu Islands. Both continuous monitoring (Tekran, Model 2537B) and manual sampling (USEPA IO-5) of atmospheric mercury were simultaneously conducted to measure the concentration of total gaseous mercury (TGM), particulate mercury (PHg), and gaseous oxidized mercury (GOM) in the atmosphere. Field sampling and analysis of atmospheric speciated mercury were conducted in winter (January), spring (April), summer (July), and fall (November) of 2013 at three sampling sites during the daytime (8:00-20:00) and nighttime (20:00-08:00) sampling periods, respectively, in order to understand the spatiotemporal distribution of atmospheric mercury at the Peughu Islands. The present study referred previous literatures about gaseous oxidized mercury (GOM) sampling and analytical methods, and combined with the existing published standard methods to conduct the sampling and analysis of GOM. This study further applied NOAA-HYSPLIT Model backward trajectory simulation plots and global fire maps to estimate the potential emission sources and the transportation routs of atmospheric air masses and further correlated with the meteorological parameters and criteria air pollutants. The concentrations of atmospheric mercury as TGM at the Penghu Islands showed a significant seasonal variation and ordered as spring> winter> fall> summer. The concentration of TGM ranged from 2.78 to 6.07 ng/m3 with an average of 4.60 Â± 1.38 ng/m3, and the highest concentration occurred at A3 site. The variation of TGM concentration between A1 and A2 sites was in steady state, while the TGM concentration variation at A3 site was undulating between the hours of 18:00 to 23:00, presumably due to the emissions from fishing boats. The seasonal variation of GOM and PHg concentrations showed that GOM concentrations were in order as summer> spring> winter> fall, while PHg concentrations were in order as spring> winter> summer> fall. Diurnal variation of GOM and PHg concentrations showed that the average GOM concentrations at daytime and nighttime were 0.108 Â± 0.094 ng/m3 and 0.054 Â± 0.037 ng/m3, respectively, with the concentration range of 0.041 ~ 0.244 ng/m3 and 0.013 ~ 0.103 ng/m3, respectively, and the highest concentration was observed at A2 site. The average PHg concentrations at daytime and nighttime were 0.329 Â± 0.167 ng/m3 and 0.210 Â± 0.124 ng/m3, respectively, with the… Advisors/Committee Members: Chung-Shin Yuan (committee member), Guor-Cheng Fang (chair), Yuan-Chung Lin (chair).

Subjects/Keywords: Penghu Islands; atmospheric mercury measurement; spatiotemporal variation; source identification; transportation routes

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APA (6^th Edition):

Chen, T. (2015). Temporospatial Distribution of Atmospheric Speciated Mercury and Their Chemical Characteristics at the Penghu Islands. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802115-183304

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):

Chen, Ti-Wen. “Temporospatial Distribution of Atmospheric Speciated Mercury and Their Chemical Characteristics at the Penghu Islands.” 2015. Thesis, NSYSU. Accessed December 11, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802115-183304.

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

MLA Handbook (7^th Edition):

Chen, Ti-Wen. “Temporospatial Distribution of Atmospheric Speciated Mercury and Their Chemical Characteristics at the Penghu Islands.” 2015. Web. 11 Dec 2019.

Vancouver:

Chen T. Temporospatial Distribution of Atmospheric Speciated Mercury and Their Chemical Characteristics at the Penghu Islands. [Internet] [Thesis]. NSYSU; 2015. [cited 2019 Dec 11]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802115-183304.

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

Council of Science Editors:

Chen T. Temporospatial Distribution of Atmospheric Speciated Mercury and Their Chemical Characteristics at the Penghu Islands. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802115-183304

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

Louisiana State University

23. Tong, Yangbin. Development of watershed-based modeling approach to pollution source identification.

Degree: MSCE, Civil and Environmental Engineering, 2013, Louisiana State University

URL: etd-07082013-160959 ; https://digitalcommons.lsu.edu/gradschool_theses/1830

► Identification of unknown pollution sources is essential to environmental protection and emergency response. A review of recent publications in source identification revealed that there are… (more)

▼ Identification of unknown pollution sources is essential to environmental protection and emergency response. A review of recent publications in source identification revealed that there are very limited numbers of research in modeling methods for rivers. What’s more, the majority of these attempts were to find the source strength and release time, while only a few of them discussed how to identify source locations. Comparisons of these works indicated that a combination of biological, mathematical and geographical method could effectively identify unknown source area(s), which was a more practical trial in a watershed. This thesis presents a watershed-based modeling approach to identification of critical source area. The new approach involves (1) identification of pollution source in rivers using a moment-based method and (2) identification of critical source area in a watershed using a hydrograph-based method and high-resolution radar rainfall data. In terms of the moment-based method, the first two moment equations are derived through the Laplace transform of the Variable Residence Time (VART) model. The first moment is used to determine the source location, while the second moment can be employed to estimate the total mass of released pollutant. The two moment equations are tested using conservative tracer injection data collected from 23 reaches of five rivers in Louisiana, USA, ranging from about 3km to 300 km. Results showed that the first moment equation is able to predict the pollution source location with a percent error of less than 18% in general. The predicted total mass has a larger percent error, but a correction could be added to reduce the error significantly. Additionally, the moment-based method can be applied to identify the source location of reactive pollutants, provided that the special and temporal concentrations are recorded in downstream stations. In terms of the hydrograph-based method, observed hydrographs corresponding to pollution events can be utilized to identify the critical source area in a watershed. The time of concentration could provide a unique fingerprint for each subbasin in the watershed. The observation of abnormally high bacterial levels along with high resolution radar rainfall data can be used to match the most possible storm events and thus the critical source area.

Subjects/Keywords: Source Identification; Moment; VART model; Time of Concentration

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APA (6^th Edition):

Tong, Y. (2013). Development of watershed-based modeling approach to pollution source identification. (Masters Thesis). Louisiana State University. Retrieved from etd-07082013-160959 ; https://digitalcommons.lsu.edu/gradschool_theses/1830

Chicago Manual of Style (16^th Edition):

Tong, Yangbin. “Development of watershed-based modeling approach to pollution source identification.” 2013. Masters Thesis, Louisiana State University. Accessed December 11, 2019. etd-07082013-160959 ; https://digitalcommons.lsu.edu/gradschool_theses/1830.

MLA Handbook (7^th Edition):

Tong, Yangbin. “Development of watershed-based modeling approach to pollution source identification.” 2013. Web. 11 Dec 2019.

Vancouver:

Tong Y. Development of watershed-based modeling approach to pollution source identification. [Internet] [Masters thesis]. Louisiana State University; 2013. [cited 2019 Dec 11]. Available from: etd-07082013-160959 ; https://digitalcommons.lsu.edu/gradschool_theses/1830.

Council of Science Editors:

Tong Y. Development of watershed-based modeling approach to pollution source identification. [Masters Thesis]. Louisiana State University; 2013. Available from: etd-07082013-160959 ; https://digitalcommons.lsu.edu/gradschool_theses/1830

University of Waterloo

24. Hazra, Budhaditya. Hybrid Time and Time-Frequency Blind Source Separation Towards Ambient System Identi cation of Structures.

Degree: 2010, University of Waterloo

URL: http://hdl.handle.net/10012/5364

► Blind source separation methods such as independent component analysis (ICA) and second order blind identification (SOBI) have shown considerable potential in the area of ambient… (more)

▼ Blind source separation methods such as independent component analysis (ICA) and second order blind identification (SOBI) have shown considerable potential in the area of ambient vibration system identification. The objective of these methods is to separate the modal responses, or sources, from the measured output responses, without the knowledge of excitation. Several frequency domain and time domain methods have been proposed and successfully implemented in the literature. Whereas frequency-domain methods pose several challenges typical of dealing with signals in the frequency-domain, popular time-domain methods such as NExT/ERA and SSI pose limitations in dealing with noise, low sensor density, modes having low energy content, or in dealing with systems having closely-spaced modes, such as those found in structures with passive energy dissipation devices, for example, tuned mass dampers.Motivated by these challenges, the current research focuses on developing methods to address the problem of separability of sources with low energy content, closely-spaced modes, and under-determined blind identification, that is, when the number of response measurements is less than the number of sources. These methods, requiring the time and frequency diversities of the measured outputs, are referred to as hybrid time and time-frequency source separation methods. The hybrid methods are classified into two categories. In the first one, the basic principles of modified SOBI are extended using the stationary wavelet transform (SWT) in order to improve the separability of sources, thereby improving the quality of identification. In the second category, empirical mode decomposition is employed to extract the intrinsic mode functions from measurements, followed by an estimation of the mode shape matrix using iterative and/or non iterative procedures within the framework of modified-SOBI. Both experimental and large-scale structural simulation results are included to demonstrate the applicability of these hybrid approaches to structural system identification problems.

Subjects/Keywords: Blind Source Separation; Ambient system identification; Modified Cross-Correlation; Time-frequency

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APA (6^th Edition):

Hazra, B. (2010). Hybrid Time and Time-Frequency Blind Source Separation Towards Ambient System Identi cation of Structures. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/5364

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):

Hazra, Budhaditya. “Hybrid Time and Time-Frequency Blind Source Separation Towards Ambient System Identi cation of Structures.” 2010. Thesis, University of Waterloo. Accessed December 11, 2019. http://hdl.handle.net/10012/5364.

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

MLA Handbook (7^th Edition):

Hazra, Budhaditya. “Hybrid Time and Time-Frequency Blind Source Separation Towards Ambient System Identi cation of Structures.” 2010. Web. 11 Dec 2019.

Vancouver:

Hazra B. Hybrid Time and Time-Frequency Blind Source Separation Towards Ambient System Identi cation of Structures. [Internet] [Thesis]. University of Waterloo; 2010. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/10012/5364.

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

Council of Science Editors:

Hazra B. Hybrid Time and Time-Frequency Blind Source Separation Towards Ambient System Identi cation of Structures. [Thesis]. University of Waterloo; 2010. Available from: http://hdl.handle.net/10012/5364

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

Syracuse University

25. Han, Kwanghoon. Development of a Novel Methodology for the Identification of VOC Emission Sources in Indoor Environments based on the Material Emission Signatures and Air Samples measured by PTR-MS.

Degree: PhD, Mechanical and Aerospace Engineering, 2011, Syracuse University

URL: https://surface.syr.edu/mae_etd/57

► One of the recent important challenges in the research field of indoor air quality is the identification of indoor Volatile Organic Compound (VOC) emission… (more)

▼ One of the recent important challenges in the research field of indoor air quality is the identification of indoor Volatile Organic Compound (VOC) emission sources to clearly pinpoint the sources of concern in a field condition. This study represents the first attempt in developing a new technique to find the sources that may be invisible or hidden based on the inspection even of experts when a building with problems of indoor air quality is suspected. The objectives of this study were 1) to determine VOC emission signatures specific to nine typical building materials by using an on-line analytical monitoring device, Proton Transfer Reaction - Mass Spectrometry (PTR-MS), 2) to explore the correlation between the PTR-MS measurements and the measurements of acceptability by human subjects, 3) to develop and evaluate a methodology to identify individual sources of VOC emissions based on the measurements of mixed air samples and the PTR-MS material emission signatures, 4) to determine the long-term variation of VOC emission signatures over time, and 5) to develop a method to account for the long-term variation of emission signatures in the application of the emission source identification method. Samples of nine building materials were tested individually and in combination, including carpet, ceiling material, gypsum board, linoleum, two paints, polyolefine, PVC and wood. VOC emissions from each material were measured in a 50-liter small-scale chamber. Chamber air was sampled by PTR-MS to establish a database of emission signatures unique to each individual material. Sorbent tube sampling and TD-GC/MS analysis were also performed to identify the major VOCs emitted and to compare the resulting data with the PTR-MS emission signatures. The data on the acceptability of air quality assessed by human subjects were obtained from a previous experimental study in which the emissions from the same batch of materials were determined under the same area-specific ventilation rates as in the case of the current measurements with PTR-MS. The same task was performed to measure combined emissions from material mixtures for the application and validation of a signal separation methodology and its source identification enhancement by the consideration of long-term emissions. The methodology was developed based on signal processing principles by employing the method of multiple regression least squares (MRLS) and a normalization technique. Source models were employed to track the change of individual material emission signatures by PTR-MS over a long period of time. It is concluded that: 1) PTR-MS can be an effective tool for establishing VOC emission signatures of material types, and there were sufficient correlations (i.e. Correlation coefficient r < -0.92 ) between the PTR-MS measurements and the acceptability of air quality for the nine materials tested when the sum of selected major individual VOC odor indices was used to represent the emission level measured by PTR-MS; 2) the proposed method… Advisors/Committee Members: Jensen S. Zhang.

Subjects/Keywords: Material emission signature; PTR-MS; Signal processing; Source identification; VOC; Engineering

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APA (6^th Edition):

Han, K. (2011). Development of a Novel Methodology for the Identification of VOC Emission Sources in Indoor Environments based on the Material Emission Signatures and Air Samples measured by PTR-MS. (Doctoral Dissertation). Syracuse University. Retrieved from https://surface.syr.edu/mae_etd/57

Chicago Manual of Style (16^th Edition):

Han, Kwanghoon. “Development of a Novel Methodology for the Identification of VOC Emission Sources in Indoor Environments based on the Material Emission Signatures and Air Samples measured by PTR-MS.” 2011. Doctoral Dissertation, Syracuse University. Accessed December 11, 2019. https://surface.syr.edu/mae_etd/57.

MLA Handbook (7^th Edition):

Han, Kwanghoon. “Development of a Novel Methodology for the Identification of VOC Emission Sources in Indoor Environments based on the Material Emission Signatures and Air Samples measured by PTR-MS.” 2011. Web. 11 Dec 2019.

Vancouver:

Han K. Development of a Novel Methodology for the Identification of VOC Emission Sources in Indoor Environments based on the Material Emission Signatures and Air Samples measured by PTR-MS. [Internet] [Doctoral dissertation]. Syracuse University; 2011. [cited 2019 Dec 11]. Available from: https://surface.syr.edu/mae_etd/57.

Council of Science Editors:

Han K. Development of a Novel Methodology for the Identification of VOC Emission Sources in Indoor Environments based on the Material Emission Signatures and Air Samples measured by PTR-MS. [Doctoral Dissertation]. Syracuse University; 2011. Available from: https://surface.syr.edu/mae_etd/57

Virginia Tech

26. White, Parker Douglas. Constrained Clustering for Frequency Hopping Spread Spectrum Signal Separation.

Degree: MS, Electrical Engineering, 2019, Virginia Tech

URL: http://hdl.handle.net/10919/93726

► The expansion of technology in areas such as smart homes and appliances, personal devices, smart vehicles, and many others, leads to more and more devices… (more)

Subjects/Keywords: FHSS; signal separation; constrained clustering; source identification; signal detection

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APA (6^th Edition):

White, P. D. (2019). Constrained Clustering for Frequency Hopping Spread Spectrum Signal Separation. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/93726

Chicago Manual of Style (16^th Edition):

White, Parker Douglas. “Constrained Clustering for Frequency Hopping Spread Spectrum Signal Separation.” 2019. Masters Thesis, Virginia Tech. Accessed December 11, 2019. http://hdl.handle.net/10919/93726.

MLA Handbook (7^th Edition):

White, Parker Douglas. “Constrained Clustering for Frequency Hopping Spread Spectrum Signal Separation.” 2019. Web. 11 Dec 2019.

Vancouver:

White PD. Constrained Clustering for Frequency Hopping Spread Spectrum Signal Separation. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/10919/93726.

Council of Science Editors:

White PD. Constrained Clustering for Frequency Hopping Spread Spectrum Signal Separation. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/93726

Massey University

27. Li, Jie. Nano-metric optimised CMOS RF receiver front-end components for UHF RFID readers.

Degree: PhD, Engineering, 2011, Massey University

URL: http://hdl.handle.net/10179/3429

► As the capabilities of wireless hand-held devices continue to increase, more pressure is placed on the performance of RF transceiver front-ends. The primary objective of… (more)

▼ As the capabilities of wireless hand-held devices continue to increase, more pressure is placed on the performance of RF transceiver front-ends. The primary objective of this research is to investigate optimal methods of implementing a receiver front-end with reduced power dissipation, reduced design complexity and minimised cost. This design will be implemented on CMOS technology due to its advantages in system integration and low-cost mass production. This thesis presents the optimisation of a CMOS RF receiver front-end components design for 866 MHz UHF RFID readers. The completed receiver front-end was fabricated on an IBM 130nm CMOS process. Circuit-level techniques were employed to reduce chip size and power consumption while providing enhanced performance. The inclusion of the finite drain-source conductance 𝑔𝑑𝑠 effect improves the nano-metric design optimisation algorithm. Simulated results and experimental data are presented that demonstrate the RF receiver design with low power dissipation and low noise while providing high performance. Low-noise amplifiers using a power-constrained simultaneous noise and input matching (PCSNIM) technique are presented first. In contrast to previously published narrow-band LNA designs, the proposed design methodology includes the finite drain-source conductance of devices, thus achieving simultaneous impedance and minimum noise matching at the very low power drain of 1.6mW from a 1V supply. The LNA delivers a power gain (S21) of 17dB, a reverse isolation (S12) of -34dB and an input power reflection ([email protected] MHz) of -30dB. It has a minimum pass-band NF of around 2dB and a 3rd order input referred intercept point (IIP3) of -16dBm. A low noise mixer is also presented utilising the PCSNIM topology with current bleeding techniques. This design is proposed to replace the conventional Gilbert cell mixer that usually exhibits a high noise figure. The proposed mixer has demonstrated the ability to scale to the targeted 130nm process and meets design requirement at the required operating frequency. It has a power conversion gain of 14.5dB, DSB noise figure of 8.7dB DSB and an IIP3 of -5.1dBM. The mixer core itself only consumes 6mW from a 1.2V supply and the complete test circuit consumes 10mW with a balun at each port. Finally, a voltage controlled oscillator (VCO) is presented. A quadrature VCO (QVCO) structure is selected to overcome the image rejection issue. Since the main goal for this work is to design a low power receiver front-end, a folded-cascode topology is employed to enable the QVCO to operate under 1V power supply. The proposed VCO has a phase noise of -140dBc/Hz at 3-MHz offset from the carrier with only 5mW of power dissipation. This gives a FoM value of -181dBc/Hz that compares favourably to recently published designs.

Subjects/Keywords: RFID; Radio frequency identification systems; CMOS; RF transceiver; Low noise amplifiers

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

APA (6^th Edition):

Li, J. (2011). Nano-metric optimised CMOS RF receiver front-end components for UHF RFID readers. (Doctoral Dissertation). Massey University. Retrieved from http://hdl.handle.net/10179/3429

Chicago Manual of Style (16^th Edition):

Li, Jie. “Nano-metric optimised CMOS RF receiver front-end components for UHF RFID readers.” 2011. Doctoral Dissertation, Massey University. Accessed December 11, 2019. http://hdl.handle.net/10179/3429.

MLA Handbook (7^th Edition):

Li, Jie. “Nano-metric optimised CMOS RF receiver front-end components for UHF RFID readers.” 2011. Web. 11 Dec 2019.

Vancouver:

Li J. Nano-metric optimised CMOS RF receiver front-end components for UHF RFID readers. [Internet] [Doctoral dissertation]. Massey University; 2011. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/10179/3429.

Council of Science Editors:

Li J. Nano-metric optimised CMOS RF receiver front-end components for UHF RFID readers. [Doctoral Dissertation]. Massey University; 2011. Available from: http://hdl.handle.net/10179/3429

University of Alberta

28. Vera Rodriguez, Ismael A. Near real-time estimation of the seismic source parameters in a compressed domain.

Degree: PhD, Department of Physics, 2012, University of Alberta

URL: https://era.library.ualberta.ca/files/cc08hg13s

► Seismic events can be characterized by its origin time, location and moment tensor. Fast estimations of these source parameters are important in areas of geophysics… (more)

Subjects/Keywords: sparse representation; seismic source parameter inversion; time-frequency analysis; compressive sensing; resolution analysis; noise attenuation; group sparsity; source mechanism inversion

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APA (6^th Edition):

Vera Rodriguez, I. A. (2012). Near real-time estimation of the seismic source parameters in a compressed domain. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/cc08hg13s

Chicago Manual of Style (16^th Edition):

Vera Rodriguez, Ismael A. “Near real-time estimation of the seismic source parameters in a compressed domain.” 2012. Doctoral Dissertation, University of Alberta. Accessed December 11, 2019. https://era.library.ualberta.ca/files/cc08hg13s.

MLA Handbook (7^th Edition):

Vera Rodriguez, Ismael A. “Near real-time estimation of the seismic source parameters in a compressed domain.” 2012. Web. 11 Dec 2019.

Vancouver:

Vera Rodriguez IA. Near real-time estimation of the seismic source parameters in a compressed domain. [Internet] [Doctoral dissertation]. University of Alberta; 2012. [cited 2019 Dec 11]. Available from: https://era.library.ualberta.ca/files/cc08hg13s.

Council of Science Editors:

Vera Rodriguez IA. Near real-time estimation of the seismic source parameters in a compressed domain. [Doctoral Dissertation]. University of Alberta; 2012. Available from: https://era.library.ualberta.ca/files/cc08hg13s

29. Santin, Matthieu. Dynamique quantique dans des conducteurs balistiques et cohérents : interrupteur quantique et transport photo-assisté : Quantum dynamics of ballistic coherent conductors : quantum switch and photo-assisted transport.

Degree: Docteur es, Physique, 2017, Paris Saclay

URL: http://www.theses.fr/2017SACLS169

►

La compréhension de la dynamique du transport électronique dans des conducteurs balistiques et cohérents est indispensable à la réalisation d’expériences d’optique électronique ou de calcul… (more)

▼

La compréhension de la dynamique du transport électronique dans des conducteurs balistiques et cohérents est indispensable à la réalisation d’expériences d’optique électronique ou de calcul quantique à partir de « flying qu-bits ». La première étape est de pouvoir injecter en régime d’effet Hall quantique un électron dans la mer de Fermi sans excitation supplémentaire : un léviton, dont les propriétés remarquables ont été expérimentalement démontrées sans champ magnétique [1], ainsi que contrôler sa trajectoire à l’aide d’interrupteurs quantiques. Dans ce travail de thèse, nous avons réalisé l’étape préliminaire qui valide la possibilité de créer des lévitons en régime d’effet Hall Quantique : cela consiste à démontrer la validité de la théorie de bruit photo-assisté dans ce régime, en utilisant une excitation sinusoïdale et monochromatique, plus simple et plus contrôlée, que celle conduisant aux lévitons. En outre, nous avons étudié lors de la thèse le phénomène physiquement relié de l’interrupteur quantique élémentaire, qui est l’ouverture et la fermeture très soudaine d’un canal de conduction élémentaire. Ce phénomène, qui pose la question fondamentale « Que se passe-t-il lorsque que la mer de Fermi est spatialement coupée en deux ? », génère un bruit intrinsèque de charge [2] que nous avons mis en évidence et donne une mesure théorique de l’entropie d’intrication quantique.[1] J. Dubois, T. Jullien, F. Portier, P. Roche, A. Cavanna, Y. Jin, W. Wegscheider, P. Roulleau, and D. C. Glattli. minimal-excitation states for electron quantum optics using levitons. Nature, 502(7473), October 2013.[2] Israel Klich and Leonid Levitov, Phys. Rev. Lett. 102, 100502 (2009)

The study of dynamic electronic transport in ballistic coherent conductor is required for the implementation of electron quantum optics experiments or the quantum computation by using “flying qu-bits”. The first step is to be able to inject in the quantum Hall effect a single electron without any additional excitations in the conductor: a Leviton, whose remarkable properties have been experimentally observed without magnetic field [1], and to control its trajectory thanks to a quantum switch. During this thesis, we confirmed the possibility to implement a leviton in the quantum Hall effect, by demonstrating the validity of the photo-assisted shot-noise theory in this regime: we use a sine excitation which is simpler to implement than a lorentzian excitation required for Levitons. We also studied a new effect described by the photo-assisted theory: a quantum switch, which is the sudden closing and opening of an elementary channel of conduction. This generates an intrinsic charge noise [2] that we have evidenced and enable us to answer the general question: “What are the effects of a spatial separation of the Fermi sea?”. Furthermore, this charge noise provides a theoretical measurement of the entanglement entropy.[1] J. Dubois, T. Jullien, F. Portier, P. Roche, A. Cavanna, Y. Jin, W. Wegscheider, P. Roulleau, and D. C. Glattli. minimal-excitation states…

Advisors/Committee Members: Glattli, Denis-Christian (thesis director).

Subjects/Keywords: Source d'électron; Interrupteur quantique; Bruit de grenaille; Qu-Bit volant; Electron source; Quantum switch; Shot noise; Flying qu-Bit

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APA (6^th Edition):

Santin, M. (2017). Dynamique quantique dans des conducteurs balistiques et cohérents : interrupteur quantique et transport photo-assisté : Quantum dynamics of ballistic coherent conductors : quantum switch and photo-assisted transport. (Doctoral Dissertation). Paris Saclay. Retrieved from http://www.theses.fr/2017SACLS169

Chicago Manual of Style (16^th Edition):

Santin, Matthieu. “Dynamique quantique dans des conducteurs balistiques et cohérents : interrupteur quantique et transport photo-assisté : Quantum dynamics of ballistic coherent conductors : quantum switch and photo-assisted transport.” 2017. Doctoral Dissertation, Paris Saclay. Accessed December 11, 2019. http://www.theses.fr/2017SACLS169.

MLA Handbook (7^th Edition):

Santin, Matthieu. “Dynamique quantique dans des conducteurs balistiques et cohérents : interrupteur quantique et transport photo-assisté : Quantum dynamics of ballistic coherent conductors : quantum switch and photo-assisted transport.” 2017. Web. 11 Dec 2019.

Vancouver:

Santin M. Dynamique quantique dans des conducteurs balistiques et cohérents : interrupteur quantique et transport photo-assisté : Quantum dynamics of ballistic coherent conductors : quantum switch and photo-assisted transport. [Internet] [Doctoral dissertation]. Paris Saclay; 2017. [cited 2019 Dec 11]. Available from: http://www.theses.fr/2017SACLS169.

Council of Science Editors:

Santin M. Dynamique quantique dans des conducteurs balistiques et cohérents : interrupteur quantique et transport photo-assisté : Quantum dynamics of ballistic coherent conductors : quantum switch and photo-assisted transport. [Doctoral Dissertation]. Paris Saclay; 2017. Available from: http://www.theses.fr/2017SACLS169

NSYSU

30. Sie, Bing-Syun. Feasibility of Estimated Shipping Noise In Southern Sea of Taiwan by AIS.

Degree: Master, Institute of Undersea Technology, 2015, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0721114-133208

► Ocean ambient noise is a vital parameter in sonar system, Noise can have different characteristics in various ocean region, because most noise source are time… (more)

Subjects/Keywords: Source Level; Southern Sea of Taiwan; Tide; AIS; Shipping Noise; AMSN; Multiple Regression Analysis; Strumming Noise

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APA (6^th Edition):

Sie, B. (2015). Feasibility of Estimated Shipping Noise In Southern Sea of Taiwan by AIS. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0721114-133208

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):

Sie, Bing-Syun. “Feasibility of Estimated Shipping Noise In Southern Sea of Taiwan by AIS.” 2015. Thesis, NSYSU. Accessed December 11, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0721114-133208.

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

MLA Handbook (7^th Edition):

Sie, Bing-Syun. “Feasibility of Estimated Shipping Noise In Southern Sea of Taiwan by AIS.” 2015. Web. 11 Dec 2019.

Vancouver:

Sie B. Feasibility of Estimated Shipping Noise In Southern Sea of Taiwan by AIS. [Internet] [Thesis]. NSYSU; 2015. [cited 2019 Dec 11]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0721114-133208.

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

Council of Science Editors:

Sie B. Feasibility of Estimated Shipping Noise In Southern Sea of Taiwan by AIS. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0721114-133208

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

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