Computational Modeling Of Percolation Conduction And Diffusion Of Heterogeneous Materials,
2017
University of Denver
Computational Modeling Of Percolation Conduction And Diffusion Of Heterogeneous Materials, Jian Qiu
Electronic Theses and Dissertations
Heterogeneous materials provide a unique combination of desirable mechanical, thermal or electrical properties. This dissertation presents several micro-structure modeling approaches to predict the effective properties of heterogeneous materials and demonstrates its certain application toward two highly heterogeneous, unconventional structural composite materials (carbon fiber reinforced composite materials and graphene nanoplatelets composite). By using the efficient computational algorithm based on the FEA, a randomly oriented disk-shaped particles system are generated. A new element partition scheme based on the vector operations and geometry of inclusion has been implemented to mesh the intersected disks. The computed equivalent conductivity is expressed as a power-law function …
A Study Of Copper And Aluminum Incorporated Chromium Oxide Core-Shell Magnetic Nanoparticles,
2017
Missouri State University
A Study Of Copper And Aluminum Incorporated Chromium Oxide Core-Shell Magnetic Nanoparticles, Tamzid Ibn Minhaj
Graduate Theses/Dissertations
The structural and magnetic properties of copper (Cu) and aluminum (Al) -incorporated chromium oxide (α-Cr2O3, i.e., chromia) inverted core-shell nanoparticles (CSNs) were investigated. The objectives of this study were to determine the role of the substituting (for chromium, Cr) element and of Cu concentration on governing the magnetic properties of the CSNs. For synthesis of the CSNs, α-Cr2O3 nanoparticles were first grown using microwave assisted synthesis whereupon a hydrothermal nanophase epitaxy (HNE) method was used to incorporate Cu or Al in the chromia-based shell of the nanoparticles. The morphology, structure and size characteristics …
Study Of Multiferroic Properties Of Ferroelectric- Ferromagnetic Heterostructures Bzt-Bct/Lsmo,
2017
Missouri State University
Study Of Multiferroic Properties Of Ferroelectric- Ferromagnetic Heterostructures Bzt-Bct/Lsmo, Md Abdullah-Al Mamun
Graduate Theses/Dissertations
Currently, there has been a flurry of research focused on multiferroic materials due to their potential applications. Lead (Pb)-based ferroelectric and multiferroic materials (PZT, PMN-PT, PZN-PT etc.) have been widely used for sensors, actuators, and electro-mechanical applications due to their excellent dielectric and piezoelectric properties. However, these materials are facing global restriction due to the toxicity of Pb. In this thesis, multiferroic properties of ferroelectric-ferromagnetic heterostructures consist of Pb-free perovskite oxides 0.5Ba(Zr0.2Ti0.8)O3-0.5 (Ba0.7 Ca0.3)TiO3 (BZT-BCT) and La0.7Sr0.3MnO3 (LSMO) have been studied. The heterostructures BZT-BCT/LSMO were …
Nonlinear Dielectric Behavior Of Field-Induced Antiferroelectric/Paraelectric-To-Ferroelectric Phase Transition For High Energy Density Capacitor Application,
2017
Michigan Technological University
Nonlinear Dielectric Behavior Of Field-Induced Antiferroelectric/Paraelectric-To-Ferroelectric Phase Transition For High Energy Density Capacitor Application, Mingyang Li
Dissertations, Master's Theses and Master's Reports
Electric field-induced antiferroelectric(AFE)/paraelectric(PE)-to-ferroelectric(FE) phase transitions are investigated for the associated nonlinear dielectric behavior, which could offer high dielectric capacity. The phenomenon in monolithic materials has been computed for Kittel antiferroelectric and BaTiO3 model systems using the Landau-Ginzburg-Devonshire theory. The general switching curves give values of the polarization as a function of external electric field. A similar computation is performed for particle-filled polymer-matrix composites where an internal depolarization field is considered. The polarization-electric field response changes with different depolarization factors, which demonstrate the shape and alignment of the dielectric particles embedded in polymer-matrix are key factors for the composite to …
The Effects Of Carboxylic Acids In Aluminum Anodizing,
2017
University of New Hampshire
The Effects Of Carboxylic Acids In Aluminum Anodizing, Abby E. Koczera
Honors Theses and Capstones
Hard-anodized alumina coatings were formed in sulfuric acid at low temperature and high current density in the presence of carboxylic acid additives. Citric acid, trimesic acid, mellitic acid and ethylenediaminetetraacetic acid (EDTA) were utilized in varying concentrations. The additives were chosen for their capacity to form complexes with tri-valent aluminum and hence impart chemical stability to the coatings. The coatings were sealed in boiling water, and corrosion resistance was observed in a high pH solution of potassium hydroxide. The coatings were examined using scanning electron microscopy (SEM) to assess coating thickness and pore dimensions. Thicker coatings were produced when the …
Polyvinyl Alcohol (Pva) Fiber-Reinforced Rubber Concrete And Rubberized Self-Compacting Concrete,
2017
Michigan Technological University
Polyvinyl Alcohol (Pva) Fiber-Reinforced Rubber Concrete And Rubberized Self-Compacting Concrete, Jiaqing Wang
Dissertations, Master's Theses and Master's Reports
This study experimentally investigates the mechanical performance and durability of Polyvinyl Alcohol (PVA) fiber-reinforced rubber concrete and the rubberized self-compacting concrete. The waste rubber particles were introduced as a partial replacement of fine aggregate in the plain concrete. In addition, the waste tire rubbers were pre-treated with alkali surface treatment method to enhance the performance. The PVA fibers were added to the concrete mixes to enhance the post-failure resistance and thus fracture energy. Rubberized fiber concrete samples were prepared with different fine aggregate replacement ratios and the optimum fiber content. At the same time, the rubber particles had been used …
Pitting Corrosion Of 410 Stainless Steel In Hcl Solutions,
2017
The University of Akron
Pitting Corrosion Of 410 Stainless Steel In Hcl Solutions, Paul D. Krell
Williams Honors College, Honors Research Projects
410 stainless steel (SS) is a material used in HCl services, such as distillation column trays in oil refineries. Unlike other alloys, however, the oil refining industry lacks a good reference for the corrosion rate of 410 SS at the varying HCl concentrations and temperatures the material might experience as trays in crude unit distillation columns. The goal of this project is to fill that knowledge gap. The corrosion behavior of 410 SS in HCl environments of pH 0.50, 1.25, 2.25, 3.25, and 4.25 at temperatures of 38, 52, 79, and 93°C was investigated using several methods. Cyclic potentiodynamic polarization …
Design And Testing Of Flexible Lithium-Ion Batteries,
2017
The University of Akron
Design And Testing Of Flexible Lithium-Ion Batteries, Ryan C. Kramanak, Matt A. Murrow, Matt Stolfer, Jered Tyler, Aaron Moser
Williams Honors College, Honors Research Projects
The goal of this disquisition is to delineate the development of a material and casing suitable for flexible lithium-ion rechargeable batteries. Development of these cells is driven by increasing interest in portable and flexible electronics. The goal is to implement them into items such as smart cards, wearable electronics, novelty packages, flexible displays, and transdermal drug delivery patches. To accomplish this task, a number of individual cathode compounds were explored that used different compositions of lithium cobalt oxide and other compounds. These cells were tested in a generic and easily manufacturable cell casing. After the catholyte compound testing was completed …
Tightening The Loop On The Circular Economy: Distributed Plastic Recycling With An Open Source Recyclebot,
2017
Michigan Technological University
Tightening The Loop On The Circular Economy: Distributed Plastic Recycling With An Open Source Recyclebot, Shan Zhong
Dissertations, Master's Theses and Master's Reports
Following the goals of a circular economy, the growth of both plastic consumption and prosumer 3-D printing are driving an interest in producing 3-D printer filament from waste plastic. However, traditional recycling can have a significant environmental impact as it demands the collection and transportation of relatively low-density waste plastics to collection centers and reclamation facilities for separation and reconstruction. Compared to the traditional recycling, distributed recycling (where consumers directly recycle their own waste) has the potential to reduce energy consumption because it can save the energy for transportation needed in conventional recycling. A promising method of such distributed plastic …
Evaluation Of Efficiency Of Various Materials To Shield From Radiation In Space Using The Monte Carlo Transport Code Called Fluka,
2016
California Polytechnic State University, San Luis Obispo
Evaluation Of Efficiency Of Various Materials To Shield From Radiation In Space Using The Monte Carlo Transport Code Called Fluka, Roman Savinov
Master's Theses
The purpose of this study is to improve spacecraft shielding from radiation in space. It focuses on the evaluation of shielding efficiency of different materials. The efficiency of a shield is evaluated by the dose profile within the shield and the amount of dose absorbed by a target using the Monte Carlo transport code called FLUKA. The output of this code is validated by recreating the experiments from published papers and comparing the results. Once the FLUKA’s output is validated, the efficiency of sixteen materials, subject to SPE and GCR sources, are evaluated. The efficiency comparison is made by fixing …
Effect Of Thickness Of Anode Functional Layer On Electrochemical Performance Of Ni-Ce0.8gd0.2o1.9 Anode-Supported Solid Oxide Fuel Cells,
2016
Fuzhou University
Effect Of Thickness Of Anode Functional Layer On Electrochemical Performance Of Ni-Ce0.8gd0.2o1.9 Anode-Supported Solid Oxide Fuel Cells, Xueping Guo, Kaiping Peng, Chan Zheng, Wei Li, Wenzhe Chen
The 8th International Conference on Physical and Numerical Simulation of Materials Processing
No abstract provided.
Study On Impact And Friction Properties Of Za45si3cu Alloy,
2016
Baise University
Study On Impact And Friction Properties Of Za45si3cu Alloy, Weihe Shi
The 8th International Conference on Physical and Numerical Simulation of Materials Processing
No abstract provided.
Modelling The Evaporation Of Aluminum In Ti–6al–4v Alloy Melted With Electron Beam And Laser,
2016
Harbin Institute of Technology
Modelling The Evaporation Of Aluminum In Ti–6al–4v Alloy Melted With Electron Beam And Laser, Xuan Wang, Liang Wang, Liang S. Luo, Yan Q. Su, Xin Z. Li, Rui R. Chen, Jing J. Guo, Heng Z. Fu
The 8th International Conference on Physical and Numerical Simulation of Materials Processing
No abstract provided.
Study On Criterion Of Fabricating Columnar Dendrite Structure Dz466 Superalloy Based On Lmc Process,
2016
Shenyang Research Institute of Foundry
Study On Criterion Of Fabricating Columnar Dendrite Structure Dz466 Superalloy Based On Lmc Process, Xun Sun
The 8th International Conference on Physical and Numerical Simulation of Materials Processing
No abstract provided.
Numerical Modeling And Seismic Assessment Of Smart Isolation System For High-Speed Railway Rc Bridge Subjected To Near-Field Ground Motions,
2016
Yangzhou University
Numerical Modeling And Seismic Assessment Of Smart Isolation System For High-Speed Railway Rc Bridge Subjected To Near-Field Ground Motions, Lingkun Chen
The 8th International Conference on Physical and Numerical Simulation of Materials Processing
No abstract provided.
Research Of Obtaining Of Composite Materials Based On Aluminum Matrix,
2016
Belarusian State Technological University
Research Of Obtaining Of Composite Materials Based On Aluminum Matrix, Dmitry Kuis, Alexandr Volochko, Artem Shegidevich, Nikolay Svidunovich
The 8th International Conference on Physical and Numerical Simulation of Materials Processing
No abstract provided.
Research Of 3d Graphene Reinforced Aluminum Matrix Composites By Semisolid Processing,
2016
Guangxi University
Research Of 3d Graphene Reinforced Aluminum Matrix Composites By Semisolid Processing, Mei Tang, Zhengbing Xu, Jianmin Zeng, Guoqiang He
The 8th International Conference on Physical and Numerical Simulation of Materials Processing
No abstract provided.
On The Lcf Behavior Of Cast Ni-Based Superalloy K3 Influenced By Eb-Pvd Nicocraly Coating At 1073 K,
2016
Guangxi University
On The Lcf Behavior Of Cast Ni-Based Superalloy K3 Influenced By Eb-Pvd Nicocraly Coating At 1073 K, Tianquan Liang, Yili Wang, Yujie Li, Xiaoming Shen, Jianmin Zeng
The 8th International Conference on Physical and Numerical Simulation of Materials Processing
No abstract provided.
Effect Of Er On Microstructure And Electrochemical Performance Of Al–Zn–In Anode,
2016
Guangxi University
Effect Of Er On Microstructure And Electrochemical Performance Of Al–Zn–In Anode, Zhengbing Xu
The 8th International Conference on Physical and Numerical Simulation of Materials Processing
No abstract provided.
Molecular Dynamics Studies Of The Adsorption Behavior Of Methyl 3-((2-Mercaptophenyl)Imino)Butanoate As Corrosion Inhibitors On Copper Surface,
2016
University of Science and Technology Beijing
Molecular Dynamics Studies Of The Adsorption Behavior Of Methyl 3-((2-Mercaptophenyl)Imino)Butanoate As Corrosion Inhibitors On Copper Surface, Jianlin Sun, Sang Xiong, Xudong Yan, Yang Xu
The 8th International Conference on Physical and Numerical Simulation of Materials Processing
No abstract provided.
