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Structure-Property Relationships Of Polyisobutylene-Block-Polyamide Thermoplastic Elastomers, Morgan Dunn Heskett 2016 University of Southern Mississippi

Structure-Property Relationships Of Polyisobutylene-Block-Polyamide Thermoplastic Elastomers, Morgan Dunn Heskett

Master's Theses

Thermoplastic elastomers (TPEs) are a class of polymer fit for a wide variety of applications due to their customizability. In the synthesis of these types of materials, an elastically-performing polymer, deemed the “soft block,” is combined with a stiffer “hard block” polymer, each of which can be selected based on their own specific properties in order to achieve desired material behavior in the final copolymer. Recently, the use of polyisobutylene as a soft block in combination with a polyamide hard block has been investigated for use in TPE synthesis. While the material showed some promising behavior, many properties were still ...


Nanostructured Morphologies In Glassy Polymer Networks, Brian Greenhoe 2016 University of Southern Mississippi

Nanostructured Morphologies In Glassy Polymer Networks, Brian Greenhoe

Dissertations

The body of this work describes a novel approach for the dispersion of multi-walled carbon nanotubes in a high Tg epoxy prepolymer matrix using a twin screw high-shear continuous reactor. The method demonstrated improves on previous dispersion methods in several ways. It offers increased efficiency through excellent heat transfer, while being solvent-less, scale-able, and tailorable to drive dispersion states to judiciously chosen dispersion states. Furthermore, it was shown that dispersion state and agglomerate morphology can be directed, in several ways, through processing conditions and also by controlling the matrix viscosity profile through cure. Broadband dielectric spectroscopy, optical hot-stage microscopy ...


Microstructure And Properties Of Spark Plasma Sintered Moalb Ceramics, Ting Lou 2016 University of Nebraska-Lincoln

Microstructure And Properties Of Spark Plasma Sintered Moalb Ceramics, Ting Lou

Mechanical (and Materials) Engineering -- Dissertations, Theses, and Student Research

Molybdenum aluminum boride (MoAlB) is a ternary transition metal boride which has promising aeronautic and nuclear applications. It inheres excellent properties of the binary transitional metal borides (e.g., MoB, ZrB2) such as high melting temperature, high hardness, and thermal conductivity. Besides, MoAlB is superior to MoB because: (1) the Al element provides an oxidation resistance at high temperatures; (2) its nanolaminated structure consisting of M-B layers with alternating Al layers results in a unique damage tolerance property. In this research, polycrystalline MoAlB have been successfully synthesized and simultaneously sintered using spark plasma sintering (SPS) from molybdenum boride (MoB ...


Optimal Grading For Strength And Functionality Of Parts Made Of Interpenetrating Polymer Networks: Load Capacity Enhancement, Zhong Chen 2016 University of Nebraska-Lincoln

Optimal Grading For Strength And Functionality Of Parts Made Of Interpenetrating Polymer Networks: Load Capacity Enhancement, Zhong Chen

Mechanical (and Materials) Engineering -- Dissertations, Theses, and Student Research

Uniform parts with stress concentrations or singularities are prone to failure under relatively small loads, which motivates researchers to seek methods to enhance the strength of these parts. This dissertation studies the optimization of material grading to design parts made of functionally graded interpenetrating polymer networks (FG-IPNs) to improve their load capacity.

An acrylate/epoxy IPN with variations of elastic Young’s modulus, Poisson’s ratio, and ultimate stress at failure is used for optimization of a plate with stress concentration. The grading is optimized by attaching the finite element method (FEM) solver to a general purpose bound-constrained optimizer. Two ...


Stress Singularity Study Of Functionally Graded Material Based On Coherent Gradient Sensing Method, Jinjun Zhang 2016 Arizona State University

Stress Singularity Study Of Functionally Graded Material Based On Coherent Gradient Sensing Method, Jinjun Zhang

Kevin Lee


Functionally graded material (FGM) has some particular characteristics due to the gradual variation of physical properties. The study on mechanical behavior of FGM is of great research value. In this work, a large scale FGM which filled with small glass spheres has been prepared by gravity assisted casting technique. The elastic material constants in static condition are measured. One optical experimental method, coherent gradient sensing (CGS), is introduced to study the mechanical behavior of FGM which has exponential variation of material property. The governing equations of CGS which is used to represent the optics-mechanics relation of the singular yield near ...


Characterization And Modeling To Design And Develop Tailored-Property Filled Glass Composites, Kevin Ewsuk 2016 Sandia National Laboratories

Characterization And Modeling To Design And Develop Tailored-Property Filled Glass Composites, Kevin Ewsuk

Composites at Lake Louise (CALL 2015)

Particle-filled-glass composites (FGCs) are being developed as new materials with structure and properties engineered for materials joining (e.g., for solid oxide fuel cells). Relative to conventional sealing glasses used to make hermetic glass-to-metal (GtM) seals, FGCs with tailored properties offer significant potential as more crack resistant hermetic seals with better performance and reliability. Additionally, compared to process sensitive crystallizable glasses, FGCs offer broader processing latitude and robustness, and afford greater control of seal microstructure and properties. FGCs are being developed using a combination of fundamental materials science and materials engineering, employing: 1) experimentally-validated molecular modeling to better understand and ...


Composite Metallic Nanofoam Structures, David Bahr, Matthew Howard, Mohamad Zbib, Raheleh Rahimi, John Balk 2016 Purdue University

Composite Metallic Nanofoam Structures, David Bahr, Matthew Howard, Mohamad Zbib, Raheleh Rahimi, John Balk

Composites at Lake Louise (CALL 2015)

Metallic nanofoams made of metals such as nickel (Ni) or gold (Au) with ligament sizes on the order of 10’s to 100’s of nm’s exhibit several remarkable properties as a consequence of their low relative density and high specific surface area, such as outstanding strength to weight ratios, enhanced plasmonic behavior and size-effect-enhanced catalytic behavior. However, these metallic nanofoams suffer from macroscopically brittle behavior due to plastic deformation in individual ligaments. With little or no barriers for slip, work-hardening is not possible within ligaments and extremely localized plasticity, once initiated, leads to a few ligaments necking and ...


Availability: A Metric For Nucleic Acid Strand Displacement Systems, Xiaoping Olson, Shohei Kotani, Jennifer E. Padilla, Natalya Hallstrom, Sara Goltry, Jeunghoon Lee, Bernard Yurke, William L. Hughes, Elton Graugnard 2016 Boise State University

Availability: A Metric For Nucleic Acid Strand Displacement Systems, Xiaoping Olson, Shohei Kotani, Jennifer E. Padilla, Natalya Hallstrom, Sara Goltry, Jeunghoon Lee, Bernard Yurke, William L. Hughes, Elton Graugnard

Elton Graugnard

DNA strand displacement systems have transformative potential in synthetic biology. While powerful examples have been reported in DNA nanotechnology, such systems are plagued by leakage, which limits network stability, sensitivity, and scalability. An approach to mitigate leakage in DNA nanotechnology, which is applicable to synthetic biology, is to introduce mismatches to complementary fuel sequences at key locations. However, this method overlooks nuances in the secondary structure of the fuel and substrate that impact the leakage reaction kinetics in strand displacement systems. In an effort to quantify the impact of secondary structure on leakage, we introduce the concepts of availability and ...


Powerful Artificial Muscles For Morphing Composites And Other Applications, Ray Baughman 2016 University of Texas at Dallas

Powerful Artificial Muscles For Morphing Composites And Other Applications, Ray Baughman

Composites at Lake Louise (CALL 2015)

Three successive generations of twist-spun artificial muscles are described and used to make morphing composites and textiles that are electrically, thermally, or chemically powered.1 Our first generation of twist-spun muscles, which are electrochemically powered by volume changes induced by double-layer charge injection, provide torsional rotation speeds of 590 rpm, and torsional strokes of 250° per millimeter of actuator length, which is 1000 times that for earlier artificial muscles. Our second generation muscles, which require no electrolyte and are based on guest-infiltrated carbon nanotube yarns, can torsionally actuate at 11,500 rpm and deliver 85 times higher power density during ...


Deterministic Three-Dimensional Composite Structures For Energy Storage, Paul Brown 2016 University of Illinois at Urbana-Champaign

Deterministic Three-Dimensional Composite Structures For Energy Storage, Paul Brown

Composites at Lake Louise (CALL 2015)

Through mesoscale design of a 3D current collector, high power density and high energy density primary and secondary (rechargeable) large format and microbatteries (Figure 1) were fabricated. At the most fundamental level, mesostructuring enables optimization of the trade-off between energy and power density in energy storage systems due to unavoidable ohmic and other losses that occur during charge or discharge. Of course, it is at fast charge and discharge, where these effects are most important. By efficient design of the ion and electron transport pathways, we and others have shown it is possible to significantly improve the power-energy relationship. We ...


C-3 Examination Of Anodized Aluminum For Surface Defects After Thermal Cycles, Boon-Chai Ng 2016 Andrews University

C-3 Examination Of Anodized Aluminum For Surface Defects After Thermal Cycles, Boon-Chai Ng

Celebration of Research and Creative Scholarship

A major cost in the fabrication of test sockets is the interposer, an interface layer that reroutes one connection to another. The interposer must have high resistivity with low loss, a smooth surface finish, high strength, resistance to chemicals involved in the process, and be extremely thin. Currently, the most common materials used for interposer are plastics, such as Torlon, Semitron, and PEEK. While these satisfy the requirements for test sockets, they do not perform well under higher ambient temperatures. Finding a less expensive, alternative material would be preferable.

In this study, anodized aluminum samples were subjected to repeat thermal ...


Biofield Energy Signals, Energy Transmission And Neutrinos, Mahendra Trivedi 2016 Trivedi Global Inc.

Biofield Energy Signals, Energy Transmission And Neutrinos, Mahendra Trivedi

Mahendra Kumar Trivedi

There has been significant data published in peer-reviewed scientific journals about Mr. Mahendra Kumar Trivedi exercising the biofield energy to change the behaviour and characteristics of living organisms including soil, seeds, plants, trees, animals, microbes, and humans, along with non-living materials including metals, ceramics, polymers, chemicals, pharmaceutical compounds and nutraceuticals, etc. This effect of Mr. Trivedi’s biofield energy on living beings and non-living materials is referred to as The Trivedi Effect ®. The changes are attributed to changes at the atomic level and the subatomic level. Changes in atomic/molecular weights are postulated to the changes in atomic mass and ...


Material Evaluation: Self Damping Wire Sd/Acsr Conductor Failures, Daniel F. Weyer 2016 University of Nebraska-Lincoln

Material Evaluation: Self Damping Wire Sd/Acsr Conductor Failures, Daniel F. Weyer

Mechanical (and Materials) Engineering -- Dissertations, Theses, and Student Research

Following numerous 954 ACSR SD Wire failures from 2010 to 2012, Nebraska Public Power District (NPPD) implemented an inspection program to determine the extent of condition for this type of widely used conductor. NPPD transmission system includes over 2000 miles of this particular conductor.

Transmission line splices are installed every 15-20 spans, with failures being located in a span containing a splice. NPPD worked with Kinectrics to complete electromagnetic field inspections for three days in 2013, with retesting performed in 2015. Throughout this inspection of 54 spans of conductor, 36 were found to have deterioration and corrosion.

Over 80% of ...


Support Model For Transfer Students Utilizing The Stem Scholarship Program, Lynn Olson, Amy J. Moll, Doug Bullock, Amit Jain, Janet Callahan 2016 Boise State University

Support Model For Transfer Students Utilizing The Stem Scholarship Program, Lynn Olson, Amy J. Moll, Doug Bullock, Amit Jain, Janet Callahan

Amy J. Moll

This paper describes how the College of Engineering at Boise State University utilized a National Science Foundation S-STEM award from 2011 to 2016 to support transfer students in their path toward graduation. The need for this support was a result of both Boise State University College of Engineering’s transition from a 2-year pre-engineering program to the establishment of Bachelors of Science in Engineering Degree programs in 1997 as well as the establishment of the College of Western Idaho as a regional community college in 2007. Both of these factors led to an increase in the numbers of incoming engineering ...


The Impact Of Volunteering At A Girls Outreach Activity On Community Formation, Donna C. Llewellyn, Janet Callahan, Amy J. Moll, Catherine Rose Bates 2016 Boise State University

The Impact Of Volunteering At A Girls Outreach Activity On Community Formation, Donna C. Llewellyn, Janet Callahan, Amy J. Moll, Catherine Rose Bates

Amy J. Moll

This paper is focused on exploring the motivation for volunteering at an engineering outreach activity. The outreach activity itself involved a two day, overnight experience for 9th and 10th grade girls that started in 2005, and which has been held annually since that time. The outreach event takes place in Boise, Idaho, and at the time of its onset was the only outreach or camp activity in the state focused on girls or young women. Across ten years, 510 total girls have participated, with approximately 85% of them coming from the immediate metropolitan area. The program was developed with a ...


The Impact Of Volunteering At A Girls Outreach Activity On Community Formation, Donna C. Llewellyn, Janet Callahan, Amy J. Moll, Catherine Rose Bates 2016 Boise State University

The Impact Of Volunteering At A Girls Outreach Activity On Community Formation, Donna C. Llewellyn, Janet Callahan, Amy J. Moll, Catherine Rose Bates

Janet M. Callahan

This paper is focused on exploring the motivation for volunteering at an engineering outreach activity. The outreach activity itself involved a two day, overnight experience for 9th and 10th grade girls that started in 2005, and which has been held annually since that time. The outreach event takes place in Boise, Idaho, and at the time of its onset was the only outreach or camp activity in the state focused on girls or young women. Across ten years, 510 total girls have participated, with approximately 85% of them coming from the immediate metropolitan area. The program was developed with a ...


Support Model For Transfer Students Utilizing The Stem Scholarship Program, Lynn Olson, Amy J. Moll, Doug Bullock, Amit Jain, Janet Callahan 2016 Boise State University

Support Model For Transfer Students Utilizing The Stem Scholarship Program, Lynn Olson, Amy J. Moll, Doug Bullock, Amit Jain, Janet Callahan

Janet M. Callahan

This paper describes how the College of Engineering at Boise State University utilized a National Science Foundation S-STEM award from 2011 to 2016 to support transfer students in their path toward graduation. The need for this support was a result of both Boise State University College of Engineering’s transition from a 2-year pre-engineering program to the establishment of Bachelors of Science in Engineering Degree programs in 1997 as well as the establishment of the College of Western Idaho as a regional community college in 2007. Both of these factors led to an increase in the numbers of incoming engineering ...


Revealing Student Misconceptions And Instructor Blind Spots With Muddiest Point Formative Feedback, Cindy Waters, Stephen J. Krause, Janet Callahan, Barry Dupen, Mary B. Vollaro, Peggie Weeks 2016 North Carolina A&T State University

Revealing Student Misconceptions And Instructor Blind Spots With Muddiest Point Formative Feedback, Cindy Waters, Stephen J. Krause, Janet Callahan, Barry Dupen, Mary B. Vollaro, Peggie Weeks

Janet M. Callahan

Of interest to all engineering disciplines, well-designed formative feedback has the potential to enhance both instructor teaching and student learning. Delivering fundamental courses year after year, can ultimately lead faculty to use stale notes or slides from past years. This approach may save time, but does not meet the shifting needs of our students who have high expectations from their instructors. One simple method to improve teaching is to employ muddiest point reflections. Muddiest point reflections involve simply asking students to anonymously reflect on what was “muddy”, i.e. confusing, during class and to rank their level of confusion which ...


Effect Of Preparation Technology On Arc Erosion Resistance Of Mgo/Cu Contact Materials, Xiuhua Guo, Kexing Song, Yanmin Zhang, Xuebin Zhang, Jianxin Gao 2016 Henan University of Science and Technology

Effect Of Preparation Technology On Arc Erosion Resistance Of Mgo/Cu Contact Materials, Xiuhua Guo, Kexing Song, Yanmin Zhang, Xuebin Zhang, Jianxin Gao

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.


Thermodynamic Calculation Of The Liquidus Surface Projection Of Multi-Component Aluminum Alloys, Jingrui Zhao, Yong Du, LIjun Zhang, Jixue Zhou, Yuansheng Yang 2016 Advanced Materials Institute, Shandong Academy of Sciences

Thermodynamic Calculation Of The Liquidus Surface Projection Of Multi-Component Aluminum Alloys, Jingrui Zhao, Yong Du, Lijun Zhang, Jixue Zhou, Yuansheng Yang

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.


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