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Articles 961 - 990 of 3180

Full-Text Articles in Engineering

Study Of Conduction Behavior In Dielectrics In Chip Level Interconnects: Detection Of Defects In Al/Sio2 Interconnects, Po-Cheng Lu Dec 2018

Study Of Conduction Behavior In Dielectrics In Chip Level Interconnects: Detection Of Defects In Al/Sio2 Interconnects, Po-Cheng Lu

Material Science and Engineering Dissertations - Archive

This dissertation presents four different electrical measurement techniques to detect structural defects in Al/SiO2 interconnects. These techniques, namely 1) polarity dependence measurement, 2) current voltage measurement, 3) two-point measurement and 4) discharge transient current measurement, can provide simple electrical parameters having direct relationship to defects state (type and quantity) in interconnect structure. All these measurement techniques use the MIM (metal-insulator-metal) structure such as the comb-serpentine structure commonly existing in integrated (IC) devices. This study also presents a newly discovered dielectric failure mechanism, that is the failure by a process of partial discharge dielectric breakdown phenomenon. The goal of the charging …

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A Dynamic Policing Simulation Framework, Khan Md Ariful Haque Dec 2018

A Dynamic Policing Simulation Framework, Khan Md Ariful Haque

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Crime is a serious problem to a society, and its costs are an economic burden. With the help of technology and developed tools, law enforcement agencies are making significant efforts to combat crime, so as to create a safer environment for society, both mentally and physically. The dynamic nature of crime and limited police resources often make their efforts challenging. Although there are numerous crime prediction models found in the policing literature, guidelines for policing strategies based on those models are still lacking. Towards addressing this gap, this dissertation constructs a dynamic policing simulation framework based on the concept of …

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A Parametric Process-Based Cost Estimation Framework To Support Conceptual Product Family Design And Production, Zahra Banakar Dec 2018

A Parametric Process-Based Cost Estimation Framework To Support Conceptual Product Family Design And Production, Zahra Banakar

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

In today’s globally competitive environment, production costs estimation is a challenging task. This competitive market has brought specific strategies in the manufacturing sector, such as introducing more new products into the market with lower prices. In order to have the most accurate production costs estimation, accurate production cost information in a useful and relevant form is needed. This study presents a cost estimation framework that integrates both activity and parametric cost estimation methods to increase the ease, accuracy, and speed of producing cost estimates for a family of products or services. There is a need for an integrated production cost …

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A Dynamic Multiple Stage, Multiple Objective Optimization Model With An Application To A Wastewater Treatment System, Prashant Tarun Dec 2018

A Dynamic Multiple Stage, Multiple Objective Optimization Model With An Application To A Wastewater Treatment System, Prashant Tarun

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Decision-making for complex dynamic systems involves multiple objectives. Various methods balance the tradeoffs of multiple objectives, the most popular being weighted-sum and constraint-based methods. Under convexity assumptions an optimal solution to the constraint-based problem can also be obtained by solving the weighted-sum problems, and all Pareto optimal solutions can be obtained by systematically varying the weights or constraint limits. The challenge is to generate meaningful weights or constraint limits that yield practical solutions. In this dissertation, we utilize the Analytic Hierarchy Process (AHP) and develop a methodology to generate weight vectors successively for a dynamic multiple stage, multiple objective (MSMO) …

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Logistics Best Practices For Regional Food Systems: A Review, Anuj Mittal, Caroline C. Krejci, Teri J. Craven Nov 2018

Logistics Best Practices For Regional Food Systems: A Review, Anuj Mittal, Caroline C. Krejci, Teri J. Craven

Industrial, Manufacturing, and Systems Engineering Faculty Publications - Archive

The modern industrial food supply system faces many major environmental and social sustainability challenges. Regional food systems, in which consumers prefer geographically proximate food producers, offer a response to these challenges. However, the costs associated with distributing food from many small-scale producers to consumers have been a major barrier to long-term regional food system success. Logistics best practices from conventional supply chains have the potential to improve the efficiency and effectiveness of regional food supply chains (RFSCs). This paper provides a structured and in-depth review of the existing literature on RFSC logistics, including recommended and implemented best practices. The purpose …

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Experimental And Numerical Study Of Evaporation From Wavy Surfaces By Coupling Free Flow And Porous Media Flow, Bo Gao, Hossein Davarzani, Rainer Helmig, Kathleen M. Smits Oct 2018

Experimental And Numerical Study Of Evaporation From Wavy Surfaces By Coupling Free Flow And Porous Media Flow, Bo Gao, Hossein Davarzani, Rainer Helmig, Kathleen M. Smits

Civil Engineering Faculty Publications - Archive

The macroscale roughness of the soil surface has significant influences on the mass/energy interactions between the subsurface and the atmosphere during evaporation. However, most previous works only consider evaporation behavior from flat surfaces. Based on experimental and numerical approaches, the goal of this work is to provide a framework for the understanding of the mechanisms of evaporation from irregular soil surfaces at representative elementary volume scale. A coupling free flow-porous media flow model was developed to describe evaporation under nonisothermal conditions. For simplicity, sinusoidal-type wavy surfaces were considered. To validate this modeling approach, an experiment using an open-ended wind tunnel …

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Coupled Thermally-Enhanced Bioremediation And Renewable Energy Storage System: Conceptual Framework And Modeling Investigation, Ali Moradi, Kathleen M. Smits, Jonathan O. Sharp Sep 2018

Coupled Thermally-Enhanced Bioremediation And Renewable Energy Storage System: Conceptual Framework And Modeling Investigation, Ali Moradi, Kathleen M. Smits, Jonathan O. Sharp

Civil Engineering Faculty Publications - Archive

This paper presents a novel method to couple an environmental bioremediation system with a subsurface renewable energy storage system. This method involves treating unsaturated contaminated soil using in-situ thermally enhanced bioremediation; the thermal system is powered by renewable energy. After remediation goals are achieved, the thermal system can then be used to store renewable energy in the form of heat in the subsurface for later use. This method can be used for enhanced treatment of environmental pollutants for which temperature is considered a limiting factor. For instance, this system can be used at a wide variety of petroleum-related sites that …

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Evaluation Of Model Concepts To Describe Water Transport In Shallow Subsurface Soil And Across The Soil–Air Interface, Zhen Li, Jan Vanderborght, Kathleen M. Smits Sep 2018

Evaluation Of Model Concepts To Describe Water Transport In Shallow Subsurface Soil And Across The Soil–Air Interface, Zhen Li, Jan Vanderborght, Kathleen M. Smits

Civil Engineering Faculty Publications - Archive

Soil water evaporation plays a critical role in mass and energy exchanges across the land– atmosphere interface. Although much is known about this process, there is no agreement on the best modeling approaches to determine soil water evaporation due to the complexity of the numerical modeling scenarios and lack of experimental data available to validate such models. Existing studies show numerical and experimental discrepancies in the evaporation behavior and soil water distribution in soils at various scales, driving us to revisit the key process representation in subsurface soil. Therefore, the goal of this work is to test different mathematical formulations …

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Characterization Of Grain-Size Distribution, Thermal Conductivity, And Gas Diffusivity In Variably Saturated Binary Sand Mixtures, T.K.K. Chamindu Deepagoda, Kathleen Smits, J.R.R.N. Jayarathne, Benjamin M. Wallen, Timothy J. Clough Aug 2018

Characterization Of Grain-Size Distribution, Thermal Conductivity, And Gas Diffusivity In Variably Saturated Binary Sand Mixtures, T.K.K. Chamindu Deepagoda, Kathleen Smits, J.R.R.N. Jayarathne, Benjamin M. Wallen, Timothy J. Clough

Civil Engineering Faculty Publications - Archive

Characterization of differently textured porous materials, as well as different volumetric porous media mixtures, in relation to mass and heat transport is vital for many engineering and research applications. Functional relations describing physical (e.g., grain-size distribution, total porosity), thermal, and gas diffusion properties of porous media and mixtures are necessary to optimize the design of porous systems that involve heat and gas transport processes. However, only a limited number of studies provide characterization of soil physical, thermal, and gas diffusion properties and the functional relationships of these properties under varying soil water contents, especially for soil mixtures, complicating optimization efforts. …

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Computational Study On The Cu-Rich Side Of Aluminum-Copper Phase Diagram, Khaled Ahmed Hirmas Aug 2018

Computational Study On The Cu-Rich Side Of Aluminum-Copper Phase Diagram, Khaled Ahmed Hirmas

Material Science and Engineering Dissertations - Archive

Cu-rich side of Al-Cu phase diagram has not been studied extensively as the Al-rich side. It is well established that a one-phase (a phase) exists at 300oC between the 82% Cu and pure Cu, and at the eutectic temperature (1032oC) between 86% Cu and pure Cu, a phase, when quenched from above 600oC and subjected to annealing below about 300oC, or deformation, show ordering effects in resistivity, heat capacity, diffuse X-ray, microstructure, and in mechanical properties. This has been studied to determine whether these effects are due to short-range or long-range ordered domain [1]. The present computational study is to …

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Lifepo4 Batteries: Impact Of Highly Parallel Packs On Load Distribution And Cycle Life, Caroline Storm Westenhover Aug 2018

Lifepo4 Batteries: Impact Of Highly Parallel Packs On Load Distribution And Cycle Life, Caroline Storm Westenhover

Electrical Engineering Dissertations - Archive

The United States Navy is considering Li-ion batteries for use as a primary power source for future naval shipboard pulsed-power applications. To supply sufficient power to a load, electrochemical cells are connected in series and parallel to create a higher voltage and higher capacity battery. The simplest way of connecting multiple cells in parallel is to tie all positive terminals together, all negative terminals together, and then electrically treat the array of cells as a single cell within the larger battery. In this configuration, a single battery management system (BMS) can be used to manage N parallel cells but there …

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Multi-Physics Design Optimization Of 2d And Advanced Heterogenous 3d Integrated Circuits, Pavan Rajmane Aug 2018

Multi-Physics Design Optimization Of 2d And Advanced Heterogenous 3d Integrated Circuits, Pavan Rajmane

Mechanical and Aerospace Engineering Dissertations - Archive

The convergence and miniaturization of computing and communications dictate building up rather than out. As planar device miniaturization continues to its ultimate limits, the complexity of circuit interconnections for 2-D devices becomes a limitation for performance and drives up power dissipation [1]. Failure analysis and its effects are major reliability concerns in electronic packaging. More accurate fatigue life prediction can be obtained after the consideration of all affecting loads on the electronic devices. In this study, an attempt is made to analyze 3 types of packages i.e. Wafer Level Chip Scale Package (WCSP), Quad Flat No-Lead (QFN) Package and 2-Die …

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A Framework For Optimal Path Planning And Nonlinear Guidance For Autonomous Mobile Robots, Paul A. Quillen Aug 2018

A Framework For Optimal Path Planning And Nonlinear Guidance For Autonomous Mobile Robots, Paul A. Quillen

Mechanical and Aerospace Engineering Dissertations - Archive

The purpose of this research is to investigate methods and technology for enhancing autonomous capabilities for mobile robots. The measures of autonomy which are specifically covered in this dissertation pertain to a mobile robot’s ability to make decisions and act, in other words guidance and control. This dissertation puts forth a framework using optimal path planning and nonlinear guidance techniques to address these matters. The path plans are synthesized using a numerical navigation function algorithm that will form its potential contour levels based on the “minimum control effort” of the system. Additionally, extensions of the path planning algorithm in the …

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Numerical And Experimental Study Of Single Phase And Multiphase Droplet Dynamics On Electrowetting-On-Dielectrode Digital Micro-Fluidics, Mun Mun Nahar Aug 2018

Numerical And Experimental Study Of Single Phase And Multiphase Droplet Dynamics On Electrowetting-On-Dielectrode Digital Micro-Fluidics, Mun Mun Nahar

Mechanical and Aerospace Engineering Dissertations - Archive

In the recent years, significant efforts have been devoted to the development of droplet based lab-on-a-chip devices of which advantages include being programmable and reconfigurable. Among various droplet flow based microsystems [1-5], electrowetting on dielectric (EWOD) digital microfluidics has many advantages, such as rapid switching response, no joule heating, no need for moving parts like pumps and valves, and most importantly low power requirement [6]. Basic droplet handling techniques - droplet dispensing, transporting, merging and splitting - can be done by sequentially activating and deactivating specific electrodes, which allows to address each droplet individually and to perform various unit processes …

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A Multiphysics Study Of Interfacial Properties Of 3d Printed Filaments, Alireza Rezaee Aug 2018

A Multiphysics Study Of Interfacial Properties Of 3d Printed Filaments, Alireza Rezaee

Mechanical and Aerospace Engineering Dissertations - Archive

Fused Deposition Modeling has become the most popular 3-D printing method over the last decade. Due to its potential to save time, cost and, labor, there is a great deal of interest to use this technique for production of functional load carrying parts and assemblies in bio-medical, automotive, aerospace, and oil and gas industries. In general, materials used in FDM process are isotropic; however, parts printed using FDM process show anisotropic mechanical properties with inconsistent properties in the transverse direction to the filaments’ cross-section. This anisotropic behavior is due to the fabrication process, and the inconsistency in the transverse mechanical …

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Characterizing Contamination To Expand Ashrae Envelope In Airside Economization And Thermal And Reliability In Immersion Cooling Of Data Centers, Jimil Manojbhai Shah Aug 2018

Characterizing Contamination To Expand Ashrae Envelope In Airside Economization And Thermal And Reliability In Immersion Cooling Of Data Centers, Jimil Manojbhai Shah

Mechanical and Aerospace Engineering Dissertations - Archive

The Datacom facility which comprises rooms or closets used for communication, computers/servers or electronic equipment requires cooling unit which consumes 31% (23% HVAC cooling + 8% HVAC fans) of overall energy. The ASHRAE TC9.9 subcommittee, on Mission Critical Facilities, Data Centers, Technology Spaces, and Electronic Equipment, has suited the data center’s executives by permitting brief period outings of the environmental conditions outside the prescribed temperature-humidity range, into passable extents A1-A3. To comprehend the expanding server densities and the required cooling vitality costs, data center operators are falling back on cost cutting measures. For instance, they are not firmly controlling the …

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Woods Tire Model, Priyank Vasant Nandu Aug 2018

Woods Tire Model, Priyank Vasant Nandu

Mechanical and Aerospace Engineering Theses - Archive

The performance of a racecar in a maneuver is almost totally determined by the characteristics of the tires and the suspension setup. If the suspension is properly tuned for the maneuver, then the limiting factor is the tire. Therefore, any racecar design and performance analysis must start with a full description of the performance of the tire [1]. Mathematical models for tire performance such as the Pacejka model have been in use for a long time and have become the standard for expressing how a tire will perform dynamically. It comprises of curve fit to experimental data and requires about …

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Achieving Novel Functionalities In Semiconductor-Crystalline Oxide Heterostructures Through Electrical And Structural Coupling, Kamyar Ahmadi-Majlan Aug 2018

Achieving Novel Functionalities In Semiconductor-Crystalline Oxide Heterostructures Through Electrical And Structural Coupling, Kamyar Ahmadi-Majlan

Material Science and Engineering Dissertations - Archive

Creating new materials that exhibit enhanced or novel behaviors is essential to meet the technological challenges we face today. Complex oxides are perfect candidates to overcome these challenges due to the range of electronic, optical, and ionic properties they exhibit. The research presented here, mainly focuses on overcoming two important challenges in oxide electronics. First,the ability of epitaxially growing multifunctional oxides on conventional semiconductor substrates and second, the successful integration of multifunctional oxide properties on semiconductors Oxide molecular beam epitaxy was utilized to grow transition metal oxides with unprecedented control, layer-by-layer, at the atomic scale. Such control of growth enables …

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An Investigation Of The Plasma Electrolytic Oxidation Mechanism For Coating Of Alumina-Zirconia Nanocomposite, Nastaran Barati Aug 2018

An Investigation Of The Plasma Electrolytic Oxidation Mechanism For Coating Of Alumina-Zirconia Nanocomposite, Nastaran Barati

Material Science and Engineering Dissertations - Archive

Plasma Electrolytic Oxidation (PEO) is an electrochemical surface modification technique which is able to coat ceramic coatings on valve metals from either cationic or anionic species in an aqueous electrolyte. Applying high voltage in the range of 300-600 V is required to achieve crystalline phases. PEO is a clean technology which offers several benefits including high deposition rates, excellent adhesion strength and mechanical properties. One of the interesting capabilities of the PEO process is its ability to form composite coatings. The following work aims to study the growth mechanism of nanocomposite layers coated by PEO. Two experimental routs have been …

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Spectral-Domain Phase-Sensitive Interferometry For Real-Time Probing Of Electrodeposition Processes, Yujen Chiu Aug 2018

Spectral-Domain Phase-Sensitive Interferometry For Real-Time Probing Of Electrodeposition Processes, Yujen Chiu

Material Science and Engineering Dissertations - Archive

Electrodeposition is a simple, versatile and scalable method for depositing thin metal films on conductive substrates, and it has long been used in large-scale industrial processes for metal film coating. In the last two decades, electrodeposition has entered into the manufacturing processes of electronic devices. Electrodeposition of Cu has become the standard process for the backend processes for almost all microelectronic devices. Electrodeposition of Cu and magnetic materials are used in the fabrication of write/read head in computer hard disk drive. More recently, a unique electrodeposition process, under potential deposition (UPD), has been utilized for atomic layer deposition to generate …

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Investigation Of Surface Contamination In A Cu-Based Al Alloy Occurring During Tem Sample Preparation, Kelly Claunch Aug 2018

Investigation Of Surface Contamination In A Cu-Based Al Alloy Occurring During Tem Sample Preparation, Kelly Claunch

Material Science and Engineering Theses - Archive

This thesis investigates the nature of surface contamination originating from the jet-polishing process on Cu-6 wt% Al TEM disks. During previous TEM imaging and diffraction analysis performed by our group, surface contamination particles, roughly 15-60 nm in diameter, were observed on the surface of the jet-polished TEM disks. Further, TEM diffraction analysis revealed that the contamination particles were growing epitaxially on the Cu matrix. HR-SEM was used to characterize the surface contamination in terms of shape, size, composition, and distribution on the surface of the disks. Through extensive HR-SEM imaging, it was found that surface contamination particles are present on …

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Detection Of Molecular Biomarkers Involved In The Induction Of Emt, Migration And Invasion, And Drug Resistance In Breast Cancer Cells In 3d Confinement, Tamara Nicole Hill Aug 2018

Detection Of Molecular Biomarkers Involved In The Induction Of Emt, Migration And Invasion, And Drug Resistance In Breast Cancer Cells In 3d Confinement, Tamara Nicole Hill

Bioengineering Dissertations - Archive

Standard-of-care regimes for cancer treatment have become more effective and sophisticated over the last decade due to research developments which facilitate specific targeting of treatments to certain cancers, and the ability to provide specialized care to cancer patients. However, cancer treatments overall still fall short of preventing spread of disease from the primary tumor to secondary sites where they settle and form new more aggressive tumors. It is this stage of disease progression which results in the majority of cancer deaths. The long-term goal of this research is to develop a system for the effective high throughput screening of chemotherapeutic …

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Fabrication And In Vitro Characterization Of An Implant For The Detection Of Metastatic Cancer Cells, Carlos Martin Cantu Aug 2018

Fabrication And In Vitro Characterization Of An Implant For The Detection Of Metastatic Cancer Cells, Carlos Martin Cantu

Bioengineering Theses - Archive

Greater than 90% of cancer related deaths are due to metastasis (Hayes & Wicha, 2011). Since current conventional techniques detect the disease by the time that it has become systemic, our lab has developed a hydrogel based cancer trap that can attract metastatic cancer cells via cytokine release. However, for continual monitoring and accessibility to the gel, an implant is needed for delivery, retention, and retrieval of the gel. The research undergone in this thesis seeks to develop such a method. Namely, the objective was to develop a polylactide (PLA) based implant that is capable of delivering and retaining a …

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Evaluation And Strengthening Of Elevated Slab On Grade With Fiber-Reinforced Polymer (Frp) Laminates, Natawut Chaiwino Aug 2018

Evaluation And Strengthening Of Elevated Slab On Grade With Fiber-Reinforced Polymer (Frp) Laminates, Natawut Chaiwino

Civil Engineering Dissertations - Archive

Elevating a residential house appears to be one of the most effective techniques to eliminate or alleviate flood losses. In general, the elevation procedures involve raising a house as well as its typical slab-on-grade (SOG) foundation and supporting it with an additional support system. The unconcerned effects of the drastic changes in support condition could lead to severe structural damages and failure of houses. After elevated, thus, such slabs must be properly supported and retrofitted, for which the available methodology and know-how is almost nonexistent. The fiber reinforced polymer (FRP) application, considered as a promising technique in the rehabilitation of …

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Development Of Mussel Inspired Nanocomposite Adhesives For Biomedical Applications, Nikhil Pandey Aug 2018

Development Of Mussel Inspired Nanocomposite Adhesives For Biomedical Applications, Nikhil Pandey

Bioengineering Dissertations - Archive

Popular bioadhesives, such as fibrin, cyanoacrylate and albumin–glutaraldehyde-based materials, have been applied for clinical applications in wound healing, drug delivery, and bone and soft tissue engineering; however, their performances are limited by weak adhesion strength and rapid degradation. The long-term goal of this research is to develop a strong tissue adhering nanocomposite for tissue interfacing and wound healing applications. We begin by developing a mussel-inspired, nanocomposite–based, biodegradable tissue adhesive by blending poly (lactic-co-glycolic acid) (PLGA) or N-hydroxysuccinimide modified PLGA nanoparticles (PLGA-NHS) and polydopamine nanoparticles with mussel-inspired polymers. Adhesive strength measurement of the nanocomposites on porcine skin-muscle constructs revealed that the …

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Nanoparticles For Gene Therapy And Protein Delivery To Induce Angiogenesis As An Alternative Treatment For Peripheral Arterial Disease, Linda Christellia Noukeu Aug 2018

Nanoparticles For Gene Therapy And Protein Delivery To Induce Angiogenesis As An Alternative Treatment For Peripheral Arterial Disease, Linda Christellia Noukeu

Bioengineering Dissertations - Archive

Peripheral arterial disease (PAD) is defined as a slow, progressive disorder of the lower extremity arterial vessels characterized by chronic narrowing that often results in occlusion and is associated with loss of functional capacity. Although the PAD occurrence rate is increasing in the elderly population, outcomes with current treatment strategies are suboptimal. Hence, there is an urgent need to develop new technologies that overcome limitations of traditional modalities for PAD detection and therapy. In this research, nanoparticles have been developed and used as carriers for various therapeutic agents to treat PAD. In particular, via protein/gene delivery, we developed and formulated …

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Experimental And Numerical Investigation Of The Concrete Shear Strength Of Reinforced Concrete Box Culverts Under Uniformly Distributed Load, Masoud Ghahremannejad Aug 2018

Experimental And Numerical Investigation Of The Concrete Shear Strength Of Reinforced Concrete Box Culverts Under Uniformly Distributed Load, Masoud Ghahremannejad

Civil Engineering Dissertations - Archive

This research resulted in the development of a new method for performing displacement control analysis of distributed loads to obtain the ultimate shear strength of structural components. A framework, consisting of several sub-frames, was designed to convert the single displacement applied at the top of the framework to equivalent uniformly-distributed forces applied to the beam. To validate the loading mechanism, using the proposed framework, the load was applied on the top of a reinforced concrete beam in the laboratory, and numerical studies were conducted. The shear capacity of the beam under a concentrated load at mid-span was compared with the …

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In-Service Performance Evaluation Of Fire And Impact Damaged Bridges With Cfrp Laminate Strengthening, Santosh Timilsina Aug 2018

In-Service Performance Evaluation Of Fire And Impact Damaged Bridges With Cfrp Laminate Strengthening, Santosh Timilsina

Civil Engineering Dissertations - Archive

Fire events and impact damage on bridges are few of the least understood of common extreme events. Bridge infrastructures that are subjected to hazards such as fire or impact from over height vehicle can catastrophically collapse or be heavily damaged. External wrapping of damaged concrete bridge components with Fiber Reinforced Polymer (FRP) laminates has been used as a strengthening technique for these bridges. Two such in-service bridges, one of which was fire damaged and the other impact damaged, both aged more than 50 years old in Irving, Texas, were selected for this study. The damaged beams of the concrete bridges …

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Investigation Of Thermo-Physical Property Enhancement Mechanism Of Molten Salt Nano-Eutectic Via Nanostructural Change And Polyalphaolefin Nanofluid Via In Situ Formation Of Superstructures, Zahra Pournorouz Aug 2018

Investigation Of Thermo-Physical Property Enhancement Mechanism Of Molten Salt Nano-Eutectic Via Nanostructural Change And Polyalphaolefin Nanofluid Via In Situ Formation Of Superstructures, Zahra Pournorouz

Mechanical and Aerospace Engineering Dissertations - Archive

For many years, scientists enhanced the specific heat capacity of molten salt nanofluids by dispersing only minute concentrations of different nanoparticles (e.g., 1 wt.%). While the specific heat capacity for molten salts was enhanced in many types of research, other engineering fluids (i.e., water, ethylene glycol, oil) showed decreased specific heat capacity with doping the nanoparticles. Recently, researchers discovered that a unique nanostructure formed by molten salt molecules, which were doped and interacted with nanoparticles, were the reason for enhanced specific heat capacity. Therefore, the enhanced specific heat capacity only happens for molten salts rather than other fluids that may …

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Wireless Antenna Sensors For Boiler Condition Monitoring, Franck Tchafa Aug 2018

Wireless Antenna Sensors For Boiler Condition Monitoring, Franck Tchafa

Mechanical and Aerospace Engineering Dissertations - Archive

Structural Health Monitoring (SHM) is a vital technology that implements real-time condition monitoring or damage detection mechanisms for the safety assurance of structural systems such as power stations, aircrafts, bridges, dams, buildings, large machinery, and more. Without proper and timely maintenance, mechanical systems are prone to failures since they experience detrimental factors such as harsh environments, excessive loads, and vibrations. Several sensing technologies exist for SHM applications. Patch antennas are among the list of these technologies, and they are an attractive choice due to their compact size, light weight, ease of manufacturing, and low fabrication cost. Patch antennas have been …

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