You searched for +publisher:"Clemson University" +contributor:("Dr. Fei Peng").
Showing records 1 – 10 of
10 total matches.
No search limiters apply to these results.
Clemson University
1.
Song, Yang.
3D Micromachining of Optical Devices on Transparent Material by Ultrafast Laser.
Degree: PhD, Electrical and Computer Engineering (Holcomb Dept. of), 2018, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/2106 
► Ultrafast lasers, also referred to as ultrashort pulse lasers, have played an important role in the development of next generation manufacturing technologies in recent years.…
(more)
▼ Ultrafast lasers, also referred to as ultrashort pulse lasers, have played an important role in the development of next generation manufacturing technologies in recent years. Their broad range of applications has been investigated in the field of microstructure processing for the biomedical, optical, and many other laboratory and industrial fields. Ultrafast laser machining has numerous unique advantages, including high precision, a small heat affected area, high peak intensity, 3D direct-writing, and other flexible capabilities When integrated with optical delivery, motion devices and control systems, one-step fabrication of assemble-free micro-devices can be realized. In particular, ultrafast lasers enable the creation of various three-dimensional, laser-induced modifications using an extremely high peak intensity over a short time frame, producing precise ablation of material and a small heat affected area in transparent materials. In contrast, lasers with longer pulse durations are based on a thermal effect, which results in significant melting in the heat affected area. In general, ultrafast laser micromachining can be used either to subtract material from or to change the material properties of both absorptive and transparent substances. Recently, integrated micro-devices including optical fiber sensors, microfluidic devices, and lab-on-chips (LOC) have gained worldwide recognition because of their unique characteristics. These micro-devices have been widely used for a broad range of applications, from fundamental research to industry. The development of integrated glass micro-devices introduced new possibilities for biomedical, environmental, civil and other industries and research areas. Of these devices, optical fiber sensors are recognized for their small size, accuracy, resistance to corrosion, fast response and high integration. They have demonstrated their excellent performance in sensing temperature, strain, refractive index and many other physical quantities. In addition to the all-in-fiber device, the LOC is another attractive candidate for use in micro-electro-mechanical systems (MEMS) because it includes several laboratory functions on a single integrated circuit. LOCs provide such advantages as low fluid volume consumption, improved analysis and response times due to short diffusion distances, and better process control, all of which are specific to their application. Combining ultrafast laser micromachining techniques with integrated micro-devices has resulted in research on a variety of fabrication methods targeted for particular purposes. In this dissertation, the direct creation of three-dimensional (3D) structures using an ultra-fast laser was investigated for use in optical devices. This research was motivated by the desire to understand more fully the relationship among laser parameters, material properties and 3D optical structures. Various all-in-fiber sensors in conjunction with femtosecond laser ablation and irradiation were investigated based on magnetic field,…
Advisors/Committee Members: Dr. Hai Xiao, Committee Chair, Dr. Lin Zhu, Dr. Pingshan Wang, Dr. Fei Peng.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Song, Y. (2018). 3D Micromachining of Optical Devices on Transparent Material by Ultrafast Laser. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/2106
Chicago Manual of Style (16th Edition):
Song, Yang. “3D Micromachining of Optical Devices on Transparent Material by Ultrafast Laser.” 2018. Doctoral Dissertation, Clemson University. Accessed January 23, 2021.
https://tigerprints.clemson.edu/all_dissertations/2106.
MLA Handbook (7th Edition):
Song, Yang. “3D Micromachining of Optical Devices on Transparent Material by Ultrafast Laser.” 2018. Web. 23 Jan 2021.
Vancouver:
Song Y. 3D Micromachining of Optical Devices on Transparent Material by Ultrafast Laser. [Internet] [Doctoral dissertation]. Clemson University; 2018. [cited 2021 Jan 23].
Available from: https://tigerprints.clemson.edu/all_dissertations/2106.
Council of Science Editors:
Song Y. 3D Micromachining of Optical Devices on Transparent Material by Ultrafast Laser. [Doctoral Dissertation]. Clemson University; 2018. Available from: https://tigerprints.clemson.edu/all_dissertations/2106
Clemson University
2.
Li, Changlong.
Gallium Substitution in Zirconate-Based Fast Ionic Conducting Ceramics.
Degree: MS, Materials Science and Engineering, 2016, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/2457
► Garnet-type Li7La3Zr2O12 (LLZO) has been demonstrated as a promising solid-state electrolyte material for lithium ion batteries. Solid-state electrolytes with room temperature conductivities in excess of…
(more)
▼ Garnet-type Li7La3Zr2O12 (LLZO) has been demonstrated as a promising solid-state electrolyte material for lithium ion batteries. Solid-state electrolytes with room temperature conductivities in excess of 10-4 S/cm are being considered as a substitute for the current liquid electrolyte and polymer based separators which would result in the enhanced safety. In the present work, the phase formation, sinterability and electrochemical properties of LLZO as a function of Ga dopant composition and synthesis route have been investigated. X-ray diffraction, combined with differential thermal analysis (DTA), scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS) characterization methods have been utilized to investigate the impact of Ga as a dopant. Tetragonal-LLZO has been synthesized by conventional solid-state reaction process and conventional sintering method with a total conductivity ~10-7 S/cm at 21℃. LLZO pellets with single cubic phase have been attained by quenching the t-LLZO in water at 600 ℃exhibiting a conductivity of ~10-4 S/cm at 21℃. The phase transition from tetragonal to cubic phase occurs when 0.1 mole of Ga was added to 1 mole LLZO powder (Li6.7La3Zr2Ga0.1O12), however, the resulting phase assemblage is still a mixture of tetragonal and cubic phases. Calcined powders with a composition of 0.5Ga-LLZO exhibited a single cubic phase as verified by XRD, further proving the supposition that higher content of Ga is beneficial for cubic phase formation. At higher doping levels, an excess of Ga in sample 1.0Ga-LLZO has been found as LiGaO2 in the powder, which works as a sintering aid and accumulates in the grain boundaries. Compared with conventional sintering process, pellets densified via spark plasma sintering displayed a higher relative density at a lower sintering temperature. The highest total ionic conductivity at room temperature in the range of 5.81×10-5 S/cm for sol-gel synthesized Li5.5La3Zr2Ga0.5O12 and sintered by conventional sintering method in the air. Also, a total lithium ionic conductivity in the range of 4.37×10-6 S/cm at room temperature for SSR synthesized Li5.5La3Zr2Ga0.5O12 and sintered by conventional sintering method in the air. Grain growth investigation on 0.5Ga-LLZO sintered by SPS and following by conventional sintering has verified the suggestion that larger grains are beneficial to the total ionic conductivity. In addition to room temperature Li-ion conductors, Ga doping in perovskite Yttrium-doped Barium Zirconate (BZY) serving as a high temperature proton conducting electrolyte material has been investigated. The sintering temperature was effectively decreased when Ga was doped into BZY structure, however, there was a concomitant decrease in the total conductivity.
Advisors/Committee Members: Dr. Kyle S. Brinkman, Committee Chair, Dr. O. Thompson Mefford, Dr. Fei Peng.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Li, C. (2016). Gallium Substitution in Zirconate-Based Fast Ionic Conducting Ceramics. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2457
Chicago Manual of Style (16th Edition):
Li, Changlong. “Gallium Substitution in Zirconate-Based Fast Ionic Conducting Ceramics.” 2016. Masters Thesis, Clemson University. Accessed January 23, 2021.
https://tigerprints.clemson.edu/all_theses/2457.
MLA Handbook (7th Edition):
Li, Changlong. “Gallium Substitution in Zirconate-Based Fast Ionic Conducting Ceramics.” 2016. Web. 23 Jan 2021.
Vancouver:
Li C. Gallium Substitution in Zirconate-Based Fast Ionic Conducting Ceramics. [Internet] [Masters thesis]. Clemson University; 2016. [cited 2021 Jan 23].
Available from: https://tigerprints.clemson.edu/all_theses/2457.
Council of Science Editors:
Li C. Gallium Substitution in Zirconate-Based Fast Ionic Conducting Ceramics. [Masters Thesis]. Clemson University; 2016. Available from: https://tigerprints.clemson.edu/all_theses/2457
Clemson University
3.
Harkins, Devin H.
The Durability of Single, Dual, and Multiphase Titanate Ceramic Waste Forms for Nuclear Waste Immobilization.
Degree: MS, Materials Science and Engineering, 2016, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/2572
► A significant amount of the energy used in the United States comes from nuclear power, which produces a large amount of waste materials. Recycling nuclear…
(more)
▼ A significant amount of the energy used in the United States comes from nuclear power, which produces a large amount of waste materials. Recycling nuclear waste is possible, but requires a way to permanently fix the unusable radionuclides remaining from the recycling process in a stable, leach resistant structure. Multiphase titanate ceramic waste forms are one promising option under consideration. However, there is insufficient work on the long term corrosion of the individual phases, as well as the multiphase systems of these ceramics. These multiphase titanate ceramic waste forms have three targeted phases: hollandite, pyrochlore, and zirconolite. Hollandite is a promising candidate for the incorporation of Cs, while pyrochlore is readily formed with lanthanides, such as Nd, the most prevalent lanthanide in the waste stream. The third targeted phase, zirconolite, is for the incorporation of zirconium and the actinides. This work looks into the formation of single phase systems of lanthanide titanates, formation of dual phase systems of Ga doped Ba hollandites and Nd titanate, durability of single phase hollandites and multiphase model systems using Vapor Hydration Testing (ASTM C 1663-09), dissolution of dual phase systems of Ga doped Ba hollandites and Nd titanate using Product Consistency Testing (ASTM C 1285-02), as well investigating how grain size affects amount of alterative phases formed using Vapor Hydration Testing. The dual phase systems of hollandites and Nd titanate show significant amounts of secondary phases forming, heavily influenced by the composition of hollandite used in the systems. The most significant phase present was BaNd2Ti5O14. This phase proves to be problematic due to the degradation to the hollandite structure. Using Vapor Hydration Testing to investigate single and multiphase systems presented many some possible alteration phases that could occur in the long term aging of these ceramics. Most notably, Cs rich phases were found in nearly every system, meaning that different hollandites produced similar phases. Using Product Consistency Testing to investigate dissolution in dual phase systems of hollandites and Nd titanate led to the conclusion that as the volume fraction of hollandite increases, so does the stability of the hollandite in the systems.
Advisors/Committee Members: Dr. Kyle S. Brinkman, Committee Chair, Dr. Marian S. Kennedy, Dr. Fei Peng.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Harkins, D. H. (2016). The Durability of Single, Dual, and Multiphase Titanate Ceramic Waste Forms for Nuclear Waste Immobilization. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2572
Chicago Manual of Style (16th Edition):
Harkins, Devin H. “The Durability of Single, Dual, and Multiphase Titanate Ceramic Waste Forms for Nuclear Waste Immobilization.” 2016. Masters Thesis, Clemson University. Accessed January 23, 2021.
https://tigerprints.clemson.edu/all_theses/2572.
MLA Handbook (7th Edition):
Harkins, Devin H. “The Durability of Single, Dual, and Multiphase Titanate Ceramic Waste Forms for Nuclear Waste Immobilization.” 2016. Web. 23 Jan 2021.
Vancouver:
Harkins DH. The Durability of Single, Dual, and Multiphase Titanate Ceramic Waste Forms for Nuclear Waste Immobilization. [Internet] [Masters thesis]. Clemson University; 2016. [cited 2021 Jan 23].
Available from: https://tigerprints.clemson.edu/all_theses/2572.
Council of Science Editors:
Harkins DH. The Durability of Single, Dual, and Multiphase Titanate Ceramic Waste Forms for Nuclear Waste Immobilization. [Masters Thesis]. Clemson University; 2016. Available from: https://tigerprints.clemson.edu/all_theses/2572
Clemson University
4.
Cheng, Baokai.
Coaxial Cable Sensors Based on Fabry-Perot Interferometers and Their Applications in Distributed Sensing.
Degree: PhD, Electrical and Computer Engineering (Holcomb Dept. of), 2017, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/2028
► Aging civic infrastructures in the world has put tremendous pressure in their maintenances because potential failure of the large size civil structures will be catastrophic.…
(more)
▼ Aging civic infrastructures in the world has put tremendous pressure in their maintenances because potential failure of the large size civil structures will be catastrophic. Structure health monitoring (SHM) has been proven effective to prevent these failures, and distributed sensing technologies are preferred in SHM as they are effective to provide comprehensive evaluation of the structures. Fiber optic sensors are well developed in the past two decades for distributed sensing, but the lack of robustness and the limited deformability of silica make them not suitable for heavy duty and large deformation applications, which is very common in SHM. To address the above limitation of optical fiber sensors, we change the sensing platform from optical fibers to coaxial cable. Inspired by optical FPI, we created two reflectors on a coaxial cable to form a coaxial cable Fabry-Perot interferometer (CCFPI). The reflectors are commonly made by drilling half way holes or crimp on the cable, which introduce impedance discontinuity and hence partial reflection of EM wave in the cable. The two reflectors can produce interference patterns with multiple resonant frequencies which can be tracked to indicate changes in physical parameters such as temperature and strain. To realize distributed sensing, multiple reflectors are implemented along a coaxial cable, where every two consecutive reflectors will form a low finesse CCFPI. A specific signal process technique is used to reconstruct each individual CCFPI interferogram from the complex frequency domain signal. As examples of the distributed sensing capability of the coaxial cable platform, distributed torsion sensing and 3D beam shape estimation system are demonstrated in this thesis. By modifying the cable material and structure, we can achieve other special function for CC-FPI sensors. By fabricating the cable with ceramics as dielectric material and implanting built in reflectors, a high temperature CC-FPI sensor is developed and tested. Another example is a magnetic field sensor made by filling a cavity in a semi-rigid cable with ferrofluid. When external magnetic field change, the property of the ferrofluid will also change, resulting in spectrum shift of the FPI. The coaxial cable FPI sensors have many potentials to measure different physical parameters in distributed sensing form, which makes it a very good sensing platform for long distance and distributed sensing in harsh environment and heavy duty applications.
Advisors/Committee Members: Dr. Hai Xiao, Committee Chair, Dr. Fei Peng, Dr. Lin Zhu, Dr. Pingshan Wang.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Cheng, B. (2017). Coaxial Cable Sensors Based on Fabry-Perot Interferometers and Their Applications in Distributed Sensing. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/2028
Chicago Manual of Style (16th Edition):
Cheng, Baokai. “Coaxial Cable Sensors Based on Fabry-Perot Interferometers and Their Applications in Distributed Sensing.” 2017. Doctoral Dissertation, Clemson University. Accessed January 23, 2021.
https://tigerprints.clemson.edu/all_dissertations/2028.
MLA Handbook (7th Edition):
Cheng, Baokai. “Coaxial Cable Sensors Based on Fabry-Perot Interferometers and Their Applications in Distributed Sensing.” 2017. Web. 23 Jan 2021.
Vancouver:
Cheng B. Coaxial Cable Sensors Based on Fabry-Perot Interferometers and Their Applications in Distributed Sensing. [Internet] [Doctoral dissertation]. Clemson University; 2017. [cited 2021 Jan 23].
Available from: https://tigerprints.clemson.edu/all_dissertations/2028.
Council of Science Editors:
Cheng B. Coaxial Cable Sensors Based on Fabry-Perot Interferometers and Their Applications in Distributed Sensing. [Doctoral Dissertation]. Clemson University; 2017. Available from: https://tigerprints.clemson.edu/all_dissertations/2028
Clemson University
5.
Marro, James.
Tunable Copper Microstructures in Blanket Films and Trenches Using Pulsed Electrodeposition.
Degree: PhD, Materials Science and Engineering, 2016, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/1831
► Copper interconnects in microelectronics have long been plagued with thermo-mechanical reliability issues. Control over the copper deposition process and resulting microstructure can dictate its material…
(more)
▼ Copper interconnects in microelectronics have long been plagued with thermo-mechanical reliability issues. Control over the copper deposition process and resulting microstructure can dictate its material properties and reduce stresses as well as defects that form in the copper. In this thesis, pulse electrodeposition processing parameters were evaluated for their impact on the copper microstructure (grain size, texture, and twin density and stress state) through electron backscattering diffraction and wafer curvature measurements. Varying levels of constraint were also investigated for their effect on the copper microstructure to better understand the microstructures of more complex three-dimensional interconnects. Highly texture blanket copper films were deposited with various pulse frequencies and duty cycle, which was found to control grain size, orientation, and twin density. Higher twin densities were also observed in the films with lower residual stress. The findings from blanket film studies were carried over to trench deposited samples, where the influence of organic additives, typically used in the electrolytic bath to produce defect-free filling of advanced geometries, on the copper microstructure was studied. With the addition of organic additives, depositions produced finer grained structures with an increased contribution from the microstructure of the trench sidewall seed layer, especially with increasing trench aspect ratio. In addition, the increased constraint of the copper, resulted in larger stresses within the features and higher twin densities. The core of this dissertation demonstrated the ability to alter the resulting Cu microstructure through variations in pulse electrodeposition parameters.
Advisors/Committee Members: Dr. Kathleen Richardson, Committee Co-Chair, Dr. Yaw Obeng, Committee Co-Chair, Dr. Igor Luzinov, Dr. Marian Kennedy, Dr. Fei Peng.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Marro, J. (2016). Tunable Copper Microstructures in Blanket Films and Trenches Using Pulsed Electrodeposition. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1831
Chicago Manual of Style (16th Edition):
Marro, James. “Tunable Copper Microstructures in Blanket Films and Trenches Using Pulsed Electrodeposition.” 2016. Doctoral Dissertation, Clemson University. Accessed January 23, 2021.
https://tigerprints.clemson.edu/all_dissertations/1831.
MLA Handbook (7th Edition):
Marro, James. “Tunable Copper Microstructures in Blanket Films and Trenches Using Pulsed Electrodeposition.” 2016. Web. 23 Jan 2021.
Vancouver:
Marro J. Tunable Copper Microstructures in Blanket Films and Trenches Using Pulsed Electrodeposition. [Internet] [Doctoral dissertation]. Clemson University; 2016. [cited 2021 Jan 23].
Available from: https://tigerprints.clemson.edu/all_dissertations/1831.
Council of Science Editors:
Marro J. Tunable Copper Microstructures in Blanket Films and Trenches Using Pulsed Electrodeposition. [Doctoral Dissertation]. Clemson University; 2016. Available from: https://tigerprints.clemson.edu/all_dissertations/1831
Clemson University
6.
Tsai, Chen-Chih.
Electrospun Nanofiber Yarns for Nanofluidic Applications.
Degree: PhD, Materials Science and Engineering, 2013, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/1609
► This dissertation is centered on the development and characterization of electrospun nanofiber probes. These probes are envisioned to act like sponges, drawing up fluids…
(more)
▼ This dissertation is centered on the development and characterization of electrospun nanofiber probes. These probes are envisioned to act like sponges, drawing up fluids from microcapillaries, small organisms, and, ideally, from a single cell. Thus, the probe performance significantly depends on the materials ability to readily absorb liquids. Electrospun nanofibers gained much attention in recent decades, and have been applied in biomedical, textile, filtration, and military applications. However, most nanofibers are produced in the form of randomly deposited non-woven fiber mats. Recently, different electrospinning setups have been proposed to control alignment of electrospun nanofibers. However, reproducibility of the mechanical and transport properties of electrospun nanofiber yarns is difficult to achieve. Before this study, there were no reports demonstrating that the electrospun yarns have reproducible transport and mechanical properties. For the probe applications, one needs to have yarns with identical characteristics. The absorption properties of probes are of the main concern. These challenges are addressed in this thesis, and the experimental protocol and characterization methods are developed to study electrospun nanofiber yarns.
Advisors/Committee Members: Dr. Konstantin G. Kornev, Dr. Igor Luzinov, Dr. Douglas E. Hirt, Dr. Gary C. Lickfield, Dr. Fei Peng.
Subjects/Keywords: Materials Science and Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Tsai, C. (2013). Electrospun Nanofiber Yarns for Nanofluidic Applications. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1609
Chicago Manual of Style (16th Edition):
Tsai, Chen-Chih. “Electrospun Nanofiber Yarns for Nanofluidic Applications.” 2013. Doctoral Dissertation, Clemson University. Accessed January 23, 2021.
https://tigerprints.clemson.edu/all_dissertations/1609.
MLA Handbook (7th Edition):
Tsai, Chen-Chih. “Electrospun Nanofiber Yarns for Nanofluidic Applications.” 2013. Web. 23 Jan 2021.
Vancouver:
Tsai C. Electrospun Nanofiber Yarns for Nanofluidic Applications. [Internet] [Doctoral dissertation]. Clemson University; 2013. [cited 2021 Jan 23].
Available from: https://tigerprints.clemson.edu/all_dissertations/1609.
Council of Science Editors:
Tsai C. Electrospun Nanofiber Yarns for Nanofluidic Applications. [Doctoral Dissertation]. Clemson University; 2013. Available from: https://tigerprints.clemson.edu/all_dissertations/1609
7.
Rao, Simha Sandeep.
Computational Modeling of Alternating Current Potential Drop Measurement for Crack Detection of Multi-Functional Ceramic Coated Structures.
Degree: MS, Mechanical Engineering, 2015, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/2158
► Non-destructive testing and evaluation (NDT&E) is a set of techniques commonly used to evaluate a material for the presence of any flaws without actually…
(more)
▼ Non-destructive testing and evaluation (NDT&E) is a set of techniques commonly used to evaluate a material for the presence of any flaws without actually degrading the material itself. The Alternating Current Potential Drop (ACPD) test method is one of the NDT surface methods used to determine the electrically insulating defects beneath the surface by injection of currents in the structure and measurement of the resulting voltage difference between two or more points on the surface. The presence of defects generally increases the resistance of the structure and hence causes the drop of measured voltage. The inversion of this data can give information about the size and shape of the defects. In the petrochemical and power generation industries, ceramic coatings have been used to be applied to pipe lines in order to increase the strength and high temperature resistance, as well as prevent the pipe lines from corrosion and oxidation. However, traditional ceramic coating materials are electrically insulating. The ACPD testing method cannot be adopted for the NDT purpose. In order to overcome this disadvantage, we proposed a concept of a multi-functional ceramic coating material, in which the metal nanoparticles (such as Nickel) can be uniformly embedded into the ceramic matrix (mullite). This multi-functional ceramic matrix nanocomposite can conduct current via tunneling when the percolation threshold of the filler phase is reached. Therefore, the ACPD test method can still be adopted to predict the defect and crack beneath the surface.
In this research, we adopt the commercial finite element package, COMSOL Multiphysics, to first understand the mechanism of the ACPD method (electromagnetic coupling, skin effect and proximity effect) by the two parallel conductor's model; then investigate the ACPD co-planar conductor model and understand the effect of the ceramic coating material on the sensing signal with various coating conductivities, permeability's and frequencies. Finally, we draw conclusions and make proposals for future research.
Advisors/Committee Members: Dr. Huijuan Zhao, Dr. Fei Peng, Dr. Gang Li.
Subjects/Keywords: Ceramic; Non-destructive; Potential Drop; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rao, S. S. (2015). Computational Modeling of Alternating Current Potential Drop Measurement for Crack Detection of Multi-Functional Ceramic Coated Structures. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2158
Chicago Manual of Style (16th Edition):
Rao, Simha Sandeep. “Computational Modeling of Alternating Current Potential Drop Measurement for Crack Detection of Multi-Functional Ceramic Coated Structures.” 2015. Masters Thesis, Clemson University. Accessed January 23, 2021.
https://tigerprints.clemson.edu/all_theses/2158.
MLA Handbook (7th Edition):
Rao, Simha Sandeep. “Computational Modeling of Alternating Current Potential Drop Measurement for Crack Detection of Multi-Functional Ceramic Coated Structures.” 2015. Web. 23 Jan 2021.
Vancouver:
Rao SS. Computational Modeling of Alternating Current Potential Drop Measurement for Crack Detection of Multi-Functional Ceramic Coated Structures. [Internet] [Masters thesis]. Clemson University; 2015. [cited 2021 Jan 23].
Available from: https://tigerprints.clemson.edu/all_theses/2158.
Council of Science Editors:
Rao SS. Computational Modeling of Alternating Current Potential Drop Measurement for Crack Detection of Multi-Functional Ceramic Coated Structures. [Masters Thesis]. Clemson University; 2015. Available from: https://tigerprints.clemson.edu/all_theses/2158
8.
Marchewka, Matthew R.
Fabrication of LuAG:Pr Ceramics.
Degree: MS, Materials Science and Engineering, 2015, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/2105
► (Lu1-xPrx)3Al5O12 (LuAG:Pr) is seen as a promising scintillator for positron emission tomography (PET) scanners due to its high density and fast scintillation decay time. However,…
(more)
▼ (Lu1-xPrx)3Al5O12 (LuAG:Pr) is seen as a promising scintillator for positron emission tomography (PET) scanners due to its high density and fast scintillation decay time. However, the high temperatures needed to grow single crystals and limitations in the incorporation of Pr into LuAG crystals make transparent ceramics of this material an attractive alternative. In this work, (Lu1-xPrx)3Al5O12 powders and ceramic bodies with different Pr concentrations, from x = 0.0001 to x = 0.05 were fabricated and characterized. The luminescence concentration quenching of LuAG:Pr powders and ceramic bodies was estimated by means of photoluminescence measurements. The powders show maximum photoluminescence intensity at dopant concentration of 0.18-0.33 at.%. Sintering of the pressed powder compacts at 1500°C for 20hrs in air produced a substantial increase in luminescence intensity along with a shift of the maximum photoluminescence emission intensity to lower concentrations between 0.018 and 0.18 at. % Pr. For ceramics sintered for short sintering times up to about 3-5hrs, it was determined that photoluminescence emission intensity is maximized for Pr concentrations of about 0.33 at. %. For a single Pr concentration of 0.18 at.%, the fabrication of LuAG:Pr ceramic bodies was investigated as a function of the sintering conditions, including the conventional one-step and the two-step sintering methods. The increase of sintering temperature leads to the relaxation of compressive stress, though no major effect on photoluminescence intensity was observed. The two-step sintering method revealed decoupling of densification and grain grown at sintering temperatures above about 1500°C. For sintering conditions of 1800/1700°C, dense ceramics with 97 + 0.2% of the theoretical density were obtained.
Advisors/Committee Members: Dr. Luiz G. Jacobsohn, Dr. Timothy A. DeVol, Dr. Fei Peng.
Subjects/Keywords: ceramic; Lu3Al5O12:Pr; luminescence concentration quenching; sintering; two-step sintering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Marchewka, M. R. (2015). Fabrication of LuAG:Pr Ceramics. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2105
Chicago Manual of Style (16th Edition):
Marchewka, Matthew R. “Fabrication of LuAG:Pr Ceramics.” 2015. Masters Thesis, Clemson University. Accessed January 23, 2021.
https://tigerprints.clemson.edu/all_theses/2105.
MLA Handbook (7th Edition):
Marchewka, Matthew R. “Fabrication of LuAG:Pr Ceramics.” 2015. Web. 23 Jan 2021.
Vancouver:
Marchewka MR. Fabrication of LuAG:Pr Ceramics. [Internet] [Masters thesis]. Clemson University; 2015. [cited 2021 Jan 23].
Available from: https://tigerprints.clemson.edu/all_theses/2105.
Council of Science Editors:
Marchewka MR. Fabrication of LuAG:Pr Ceramics. [Masters Thesis]. Clemson University; 2015. Available from: https://tigerprints.clemson.edu/all_theses/2105
9.
Chen, Xiangfeng.
Designs and Fabrications On Array Waveguide Gratings for Hybrid Integration.
Degree: MS, Photonic Science and Technology, 2018, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/2826
► Array waveguide gratings (AWG) plays an important role in the field of in-formation and communication technologies through implementation of wavelength division multiplexing(WDM). An AWG consists…
(more)
▼ Array waveguide gratings (AWG) plays an important role in the field of in-formation and communication technologies through implementation of wavelength division multiplexing(WDM). An AWG consists of an input waveguide, two star cou-plers, and waveguide phase arrays which provides the wavelength dispersion effect along with the output star coupler. In this thesis, I developed and fabricated AWGs and expect to use the WDM inversely to make them compatible to proposed Wave-length Beam Combining(WBC) system by our group on the silicon nitride platform. In essence, the AWG theory is based on the theory of diffraction and interference. Design rules are summarized under the guidance of AWG theory. Mask layouts and routing algorithms are demonstrated. Simulation results are compared with fabri-cated devices. Applications and further improvements of AWG are discussed as well. Due to the limitation of fabrication, only features larger than 0.5um can be resolved in our stepper lithography. Best AWG performance of our fabricated devices can reach the insertion loss of 8 dB with 2 dB non-uniformity. The average channel spac-ing is around 2.8nm. 3 dB channel bandwidth is larger than 1nm with 12.65nm free spectrum range(FSR). Crosstalk is around 19 dB.
Advisors/Committee Members: Dr. Lin Zhu, Committee Chair, Dr. Hai Xiao, Dr. Fei Peng.
Subjects/Keywords: AWG; Hybrid Integration; Silicon Nitride On Insulator
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, X. (2018). Designs and Fabrications On Array Waveguide Gratings for Hybrid Integration. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2826
Chicago Manual of Style (16th Edition):
Chen, Xiangfeng. “Designs and Fabrications On Array Waveguide Gratings for Hybrid Integration.” 2018. Masters Thesis, Clemson University. Accessed January 23, 2021.
https://tigerprints.clemson.edu/all_theses/2826.
MLA Handbook (7th Edition):
Chen, Xiangfeng. “Designs and Fabrications On Array Waveguide Gratings for Hybrid Integration.” 2018. Web. 23 Jan 2021.
Vancouver:
Chen X. Designs and Fabrications On Array Waveguide Gratings for Hybrid Integration. [Internet] [Masters thesis]. Clemson University; 2018. [cited 2021 Jan 23].
Available from: https://tigerprints.clemson.edu/all_theses/2826.
Council of Science Editors:
Chen X. Designs and Fabrications On Array Waveguide Gratings for Hybrid Integration. [Masters Thesis]. Clemson University; 2018. Available from: https://tigerprints.clemson.edu/all_theses/2826
10.
Chen, Zhaoxi.
Ceramic Thin Films with Embedded Magnetic Nanofibers or Nanorods of Controlled Orientations.
Degree: PhD, Materials Science and Engineering, 2016, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/1852
► Ceramic thin films embedded with oriented magnetic nanofibers or nanorods are highly demanded for the applications in remote sensing, electromagnetic shielding, and thermal management at…
(more)
▼ Ceramic thin films embedded with oriented magnetic nanofibers or nanorods are highly demanded for the applications in remote sensing, electromagnetic shielding, and thermal management at high temperatures. The general strategy for developing ceramic composite thin films with aligned magnetic nanorods or nanofibers has not been developed yet. This dissertation is centered on fundamentally understanding a sol-gel and polymer-based route towards creation of ceramic thin films with aligned magnetic nanostructures. The topics cover fabrication and properties of ceramic and ceramic-based nanofibers, precipitating magnetic nanoparticles within ceramic fibers, aligning and embedding nanofibers or nanorods within ceramic films, and preventing cracking during the sol-gel film dip-coating processing on flat substrates or on substrates with protrusions such as nanorods or nanofibers. The recent status and challenges in developing ceramic based nanocomposite and its potential applications are reviewed in chapter I. The feasible methodologies and general approaches are described. In chapter II and chapter III, we present the development of mullite and mullite-based composite nanofibers as potential fillers in ceramic thin films. The detailed schemes of materials formation and approaches for microstructure control are discussed in detail. The mechanical and magnetic properties of the mullite-based fibers are studied. In chapter IV, the high temperature in situ precipitation of nickel nanoparticles within the mullite fiber host is studied, to fundamentally understand the processing mechanism and its potential for high temperatures applications. In chapter V, we present the fundamental understanding of processing crack-free mullite thin films by sol-gel method. In chapter VI, the scientific approach is described for processing macroscopic ceramic thin films embedded with magnetic nanorods of controlled alignment. In chapter VII, the ceramic thin film formation with embedded nanorods is studied both theoretically and experimentally. The mechanism and criterion of microscopic cracking within the thin film composites is discussed.
Advisors/Committee Members: Dr. Fei Peng, Committee Chair, Dr. Konstantin Kornev, Dr. Rajendra K. Bordia, Dr. Igor Luzinov, Dr. Huijuan Zhao.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, Z. (2016). Ceramic Thin Films with Embedded Magnetic Nanofibers or Nanorods of Controlled Orientations. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1852
Chicago Manual of Style (16th Edition):
Chen, Zhaoxi. “Ceramic Thin Films with Embedded Magnetic Nanofibers or Nanorods of Controlled Orientations.” 2016. Doctoral Dissertation, Clemson University. Accessed January 23, 2021.
https://tigerprints.clemson.edu/all_dissertations/1852.
MLA Handbook (7th Edition):
Chen, Zhaoxi. “Ceramic Thin Films with Embedded Magnetic Nanofibers or Nanorods of Controlled Orientations.” 2016. Web. 23 Jan 2021.
Vancouver:
Chen Z. Ceramic Thin Films with Embedded Magnetic Nanofibers or Nanorods of Controlled Orientations. [Internet] [Doctoral dissertation]. Clemson University; 2016. [cited 2021 Jan 23].
Available from: https://tigerprints.clemson.edu/all_dissertations/1852.
Council of Science Editors:
Chen Z. Ceramic Thin Films with Embedded Magnetic Nanofibers or Nanorods of Controlled Orientations. [Doctoral Dissertation]. Clemson University; 2016. Available from: https://tigerprints.clemson.edu/all_dissertations/1852
. 
Open Access Theses and Dissertations
