Tailoring The Mechanical And Optical Properties Of Silicon-Niobium-Nitride Composite Coatings,
2019
University of Texas at El Paso
Tailoring The Mechanical And Optical Properties Of Silicon-Niobium-Nitride Composite Coatings, Cristian Orozco
Open Access Theses & Dissertations
Nitride nanocomposite thin films have generated significant attention as a result of their robust mechanical properties, excellent triobology, and good chemical (corrosion) stability. Due to their excellent hardness and high wear resistance NbN coatings have found use in a wide variety of applications such as the coating of cutting tools and to strengthen the surface mechanical properties of superconducting cavities. The mechanical properties of NbN can be further improved through mixing with Si3N4, leading to the formation of a nanocomposite structure. NbN-Si3N4 nanocomposite coatings have been actively studied due to their high hardness, high elastic modulus, and high resistance to …
Exploration And Optimization Of Biomaterials And Cells Required For The Fabrication Of A "Cardiac Patch",
2019
University of Texas at El Paso
Exploration And Optimization Of Biomaterials And Cells Required For The Fabrication Of A "Cardiac Patch", Shweta Anil Kumar
Open Access Theses & Dissertations
Cardiac failure induced by myocardial infarction is believed to be one of the primary causes of morbidity and mortality all over the world. Affecting more than 26 million people worldwide, its prevalence has been observed to increase steadily. Myocardial infarction, which intitially begins as the occlusion of of a coronary artery, results in the death of millions of cardiomyocytes by obstructing blood flow to the serviced regions of the myocardium. The dead myocardium is replaced by a dense,collagenous scar which reduces the contractility of the heart, gradually leading to heart attacks. Most of the existing treatment therapies are palliative in …
Interfacial Behavior In Polymer Derived Ceramics And Salt Water Purification Via 2d Mos2,
2019
University of Central Florida
Interfacial Behavior In Polymer Derived Ceramics And Salt Water Purification Via 2d Mos2, Hao Li
Electronic Theses and Dissertations
In the present dissertation, the behavior of the internal potential barrier in a polymer-derived amorphous SiAlCN ceramic was studied by measuring its complex impedance spectra at various dc bias as well as different testing and annealing temperatures. The complex impedance spectra of the polymer-derived a-SiAlCN were measured under various dc bias voltages in a temperature range between 50 and 150°C, as well as different annealing temperatures (1100-1400 °C). All spectra, regardless of temperature and bias, consist of two semi-circular arcs, corresponding to the free-carbon phase and the interface, respectively. The impedance of the free-carbon phase is independent of the bias, …
Resistance To Helium Bubble Formation In
Amorphous Sioc/Crystalline Fe Nanocomposite,
2019
University of Nebraska-Lincoln
Resistance To Helium Bubble Formation In Amorphous Sioc/Crystalline Fe Nanocomposite, Qing Su, Tianyao Wang, Jonathan Gigax, Lin Shao, Michael Nastasi
Department of Mechanical and Materials Engineering: Faculty Publications
The management of radiation defects and insoluble He atoms represent key challenges for structural materials in existing fission reactors and advanced reactor systems. To examine how crystalline/amorphous interface, together with the amorphous constituents affects radiation tolerance and He management, we studied helium bubble formation in helium ion implanted amorphous silicon oxycarbide (SiOC) and crystalline Fe composites by transmission electron microscopy (TEM). The SiOC/Fe composites were grown via magnetron sputtering with controlled length scale on a surface oxidized Si (100) substrate. These composites were subjected to 50 keV He+ implantation with ion doses chosen to produce a 5 at% peak He …
Geothermal Resource Assessment Of Mississippi,
2019
University of Mississippi
Geothermal Resource Assessment Of Mississippi, Adam Blake Goodwin
Electronic Theses and Dissertations
Geothermal energy is exploited through the process of using hot water or steam extracted from reservoirs of geothermal heat in Earth's crust which is derived from the upward convection and conduction of heat from Earth’s mantle and core. This energy can be harnessed to power geothermal heat pumps, heat water, or to generate electricity. Previous geothermal assessments of Mississippi have been locally focused, either in the southern Mississippi River flood plains or in eastern north central Mississippi at an active lignite coal mine. The focus of this project was to calculate and map heat flow estimates within the entire state …
A Numerical Study Of Granular Dam-Break Flows,
2019
University of Mississippi
A Numerical Study Of Granular Dam-Break Flows, Nuttita Pophet
Electronic Theses and Dissertations
Granular flows are mass movements of mixtures of solid particles and interstitial fluid. Examples include landslides, debris flows and tailings dam-break flows. These types of flows are often catastrophic events, and cover a wide range of phenomena of interest to both scientists and engineers. The mechanical properties of granular materials and the hydraulic behavior of the flows originate from solid and fluid phases, their distribution and interaction. Understanding the behavior of these types of flows and developing reliable predictive models are important.
The Effect Of Curing And Zirconium Content On The Wettability And Structure Of A Silicate Hybrid Sol-Gel Material,
2019
Technological University Dublin
The Effect Of Curing And Zirconium Content On The Wettability And Structure Of A Silicate Hybrid Sol-Gel Material, Emma Machugh, Maikki Cullen, Alicja Kaworek, Brendan Duffy, Mohamed Oubaha
Articles
Functional hybrid sol-gel coatings have been developed for numerous applications with a wide range of wettabilities. This study proposes to investigate the relationship between the structure and the wetting properties of a zirconium modified silicate hybrid sol-gel coating. The structures of the coatings were altered by varying the content of zirconium, and the curing process, while keeping the sol-gel preparation conditions identical. The structure of the materials was characterized by FTIR, 29Si NMR and SEM. The thermal properties and the wettability are identified by DSC and contact angle measurements, respectively. By corroborating the structural and wettability analyses, it is shown …
Wearable Devices For Single Cell Sensing And Transfection,
2019
Beihang University, Beijing
Wearable Devices For Single Cell Sensing And Transfection, Lingqian Chang, Yu-Chieh Wang, Faheem Ershad, Ruiguo Yang, Cunjiang Yu, Yubo Fan
Department of Mechanical and Materials Engineering: Faculty Publications
Transdermal drug delivery systems have been successful for decades. Now these devices can be further scaled down, and their applications have been extended to wide selections of cargo, ranging from natural molecules (e.g., insulin and glucose) to bioengineered molecules (e.g., nanoparticles and vaccines). Some emerging nanopatches show promise for precise single-cell gene transfection in vivo and have advantages over conventional tools in terms of delivery efficiency, safety, and controllability of delivered dose. In this review, we discuss recent technical advances in wearable micro/nano devices with unique capabilities or potential for single-cell biosensing and transfection in the skin or other organs, …
Segregation Of Mo Atoms Into Stacking Faults In Crfeconimo Alloy,
2019
University of Nebraska-Lincoln
Segregation Of Mo Atoms Into Stacking Faults In Crfeconimo Alloy, Kaisheng Ming, Xiaofang Bi, Jian Wang
Department of Mechanical and Materials Engineering: Faculty Publications
Solute segregation at dislocations can impede the motion of dislocations, strengthening materials. Here, we study the formation and role of solute segregation at dislocations in CrFeCoNiMo high-entropy alloys (HEAs) by high-angle annular dark-field scanning transmission electron microscopy imaging and mechanical testing both deformed and annealed samples. Mo atoms exhibit pronounced segregation into the planar-extended core of dislocations, i.e. stacking faults, causing the increase in the yield strength while the loss of the ductility. This work suggests that mechanical properties of HEAs can be tailored by alloying additional elements that are in favor of segregation into dislocations.
Optimization Of Protein-Protein Interaction Measurements For Drug Discovery Using Afm Force Spectroscopy,
2019
Michigan State University
Optimization Of Protein-Protein Interaction Measurements For Drug Discovery Using Afm Force Spectroscopy, Yongliang Yang, Bixi Zeng, Zhiyong Sun, Amir Monemianesfahani, Jing Hou, Nian-Dong Jiao, Lianqing Liu, Liangliang Chen, Marc D. Basson, Lixin Dong, Ruiguo Yang, Ning Xi
Department of Mechanical and Materials Engineering: Faculty Publications
Increasingly targeted in drug discovery, protein-protein interactions challenge current high throughput screening technologies in the pharmaceutical industry. Developing an effective and efficient method for screening small molecules or compounds is critical to accelerate the discovery of ligands for enzymes, receptors and other pharmaceutical targets. Here, we report developments of methods to increase the signal-to-noise ratio (SNR) for screening protein-protein interactions using atomic force microscopy (AFM) force spectroscopy. We have demonstrated the effectiveness of these developments on detecting the binding process between focal adhesion kinases (FAK) with protein kinase B (Akt1), which is a target for potential cancer drugs. These developments …
Local Control Robotic Surgical Devices And Related Methods,
2019
Ravenna, NE
Local Control Robotic Surgical Devices And Related Methods, Eric Markvicka, Tom Frederick, Jack Mondry, Joe Bartels, Shane Michael Farritor
Department of Mechanical and Materials Engineering: Faculty Publications
The various robotic medical devices include robotic devices that are disposed within a body cavity and positioned using a support component disposed through an orifice or opening in the body cavity. Additional embodiments relate to devices having arms coupled to a device body wherein the device has a minimal profile such that the device can be easily inserted through smaller incisions in comparison to other devices without such a small profile. Further embodiments relate to methods of operating the above devices.
Medical Inflation, Attachment And Delivery Devices And Related Methods,
2019
Boulder, CO
Medical Inflation, Attachment And Delivery Devices And Related Methods, Mark Rentschler, Shane Michael Farritor
Department of Mechanical and Materials Engineering: Faculty Publications
The various embodiments disclosed herein relate to procedural space maintenance devices, medical device positioning devices, and devices that provide both procedural space maintenance and device positioning. Further embodiments relate to medical device insertion and/or retraction devices.
Preliminary Examination Of The Effects Of Time And Flexural Direction On An Anisotropic Geosynthetic Cementitious Composite Mat,
2019
Eastern Illinois University
Preliminary Examination Of The Effects Of Time And Flexural Direction On An Anisotropic Geosynthetic Cementitious Composite Mat, James M. Proctor
Undergraduate Honors Theses
The significance of this research was to determine the effect the main fabric weave direction and cure time has on the maximum load of 0.34 inch anisotropic Geosynthetic Cementitious Composite Mat sample coupons. Two series of tests were run. The first used a three-point bend test on the material samples with varying cure times to determine the average maximum load associated with each. The second series of testing used followed ASTM D8030/D8030M - 16 for sample preparation and ASTM D8058 - 17 for testing to determine the flexural strength and modulus of elasticity of the test samples with and against …
Fabrication And Characterization Of Nonlinear Optical Ceramics For Random Quasi-Phase-Matching,
2019
University of Central Florida
Fabrication And Characterization Of Nonlinear Optical Ceramics For Random Quasi-Phase-Matching, Xuan Chen
Electronic Theses and Dissertations
A number of technologies rely on the conversion of short laser pulses from one spectral domain to another. Efficient frequency conversion is currently obtained in ordered nonlinear optical materials and requires a periodic spatial modulation of their nonlinear coefficient which results in a narrow bandwidth. One can trade off efficiency for more spectral bandwidth by relaxing the strict phase-matching conditions and achieve nonlinear interaction in carefully engineered disordered crystalline aggregates, in a so-called random quasi-phase-matching (rQPM) process. In this dissertation, we examine appropriate fabrication pathways for (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) and ZnSe transparent ceramics for applications in the mid-IR. The main challenge …
Nanoscale Spectroscopy In Energy And Catalytic Applications,
2019
University of Central Florida
Nanoscale Spectroscopy In Energy And Catalytic Applications, Yi Ding
Electronic Theses and Dissertations
Emerging societal challenges such as the need for more sustainable energy and catalysis are requiring more sensitive and versatile measurements at the nanoscale. This is the case in the design and optimization of new materials for energy harvesting (solar cells) and energy storage devices (batteries and capacitors), or for the development of new catalysts for carbon sequestration or other reactions of interest. Hence, the ability to advance spectroscopy with nanoscale spatial resolution and high sensitivity holds great promises to meet the demands of deeper fundamental understanding to boost the development and deployment of nano-based devices for real applications. In this …
Synthesis, Design, And Evaluation Of The Fluorescent Detection Of Polychlorinated Biphenyls(Pcbs) In Aqueous System,
2019
University of Kentucky
Synthesis, Design, And Evaluation Of The Fluorescent Detection Of Polychlorinated Biphenyls(Pcbs) In Aqueous System, Irfan Ahmad
Theses and Dissertations--Chemical and Materials Engineering
The exposure to halogenated persistent organic pollutants (POPs), such as polychlorinated biphenyls (PCBs), has been linked to numerous inflammatory diseases, including diabetes, cancer and lowered immune response. PCBs have low solubility in water, and they interact with other contaminants, making their detection quite challenging. While, there have been several attempts at improving the ease of detection and sensing of PCBs, gas chromatography-mass spectrometry (GC-MS) remains the gold standard. However, despite its ubiquitous use, GC-MS is a challenging technique that requires high skill and careful sample preparation, which are time-consuming and costly. As such, there is still a need to develop …
Theoretical And Experimental Study For Tailoring The Electromagnetic Properties Of Conductive Materials,
2019
University of Central Florida
Theoretical And Experimental Study For Tailoring The Electromagnetic Properties Of Conductive Materials, Jeffrey Jennings
Electronic Theses and Dissertations
Induction in leaded, implanted medical devices exposed to radio frequency (RF) magnetic fields during magnetic resonance imaging (MRI) produce Joule heating in adjacent tissues causing various issues, including death. Given the importance of MRI as a diagnostic tool and the growth in leaded device-related treatments, identification of a solution ensuring their compatibility is of great interest. Electromagnetic (EM) surface property tailoring in lead materials to change their inductive response by adding functionally-graded, heterogeneous surface layers is a possible solution. However, non-uniform EM properties introduce two challenges: the added complexity of analyses and characterization of the graded region. This dissertation addresses …
Analysis Of Residual Stress And Damage Mechanisms Of Thermal Barrier Coatings Deposited Via Ps-Pvd And Eb-Pvd,
2019
University of Central Florida
Analysis Of Residual Stress And Damage Mechanisms Of Thermal Barrier Coatings Deposited Via Ps-Pvd And Eb-Pvd, Linda Rossmann
Electronic Theses and Dissertations
Thermal barrier coatings (TBCs) are critical to gas turbine engines, as they protect the components in the hot section from the extreme temperatures of operation. The current industry standard method of applying TBCs for turbine blades in jet engines is electron-beam physical vapor deposition (EB-PVD), which results in a columnar structure that is valued for its high degree of strain tolerance. An emerging deposition method is plasma-spray physical vapor deposition (PS-PVD), capable of producing a variety of customizable microstructures as well as non-line-of-sight deposition, which allows more complex geometries to be coated, or even multiple parts at once. The pseudo-columnar …
Fe Modeling Methodology For Load Analysis And Preliminary Sizing Of Aircraft Wing Structure,
2019
Defense Acquisition Program Administration
Fe Modeling Methodology For Load Analysis And Preliminary Sizing Of Aircraft Wing Structure, Jun Hwan Jang, Sang Ho Ahn
International Journal of Aviation, Aeronautics, and Aerospace
It is a critical part at the basic design phase of aircraft structural design to build a finite element model and it will have a direct impact on time and cost for airframe structure development. In addition, the objective of finite element model will be varied depending on each design review phase and the modelling methodology varied accordingly. In order to build an effective and economic finite element model, it is required to develop adequate level of modelling methodology based on each design phase and its objectives. Therefore, in this paper, the finite element modeling methodology was presented for internal …
Technological Cooperation Network In Biotechnology Analysis Of Patents With Brazil As The Priority Country,
2019
University of Sao Paulo, Brazil
Technological Cooperation Network In Biotechnology Analysis Of Patents With Brazil As The Priority Country, Cristiano Goncalves Pereira, Rodrigo Ribeiro Da Silva, Joao Ricardo Lavoie, Geciane Silveira Porto
Engineering and Technology Management Faculty Publications and Presentations
Purpose – The establishment of partnerships between companies, government and universities aims to enhance innovation and the technological development of institutions. The biotechnology sector has grown in recent years mainly driven by its cooperative business model. Compared to other countries, this sector is slowly advancing in Brazil, with delays in science, technology and innovation, especially in the private sector. This paper aims to examine, through social network analysis, the collaborative networks between institutions that filed patents in biotechnology – medicinal preparations from plants – whose inventions had Brazil as the priority country. Design/methodology/approach – The study of technological cooperation using …
