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Articles 1741 - 1770 of 3180
Full-Text Articles in Engineering
Design Of A Real Time Reconfigurable Bioreactor, Amol Vengurlekar
Design Of A Real Time Reconfigurable Bioreactor, Amol Vengurlekar
Electrical Engineering Theses - Archive
In this thesis we present the design of a reconfigurable continuous culture bioreactor that allows researchers to grow microorganisms in a controlled environment for long periods of time, as long as several months. The bioreactor monitors the experiment and measures the growth of microorganisms. A continuous culture bioreactor is an important tool that biologists use for research, most notably to study the response of bacteria towards drugs. This helps in the fight against the evolution of drug resistance in bacteria and other pathogens.The bioreactor acts like an isolated ecosystem. It periodically exposes the microorganisms to drugs that hamper their growth. …
Analysis Of Thin-Walled Cylindrical Composite Shell Structures Subject To Axial And Bending Loads: Concept Development, Analytical Modeling And Experimental Verification, Sthanu Mahadev
Mechanical and Aerospace Engineering Dissertations - Archive
Several studies have focused on the modeling and response characterization of composite structural members, with particular emphasis on thin-walled cylindrical composite shells. This class of shell configurations is explored to determine their mechanical response in primary aerospace structural members. The present work is focused on formulating a modified composite shell theory prognosis methodology for investigating the structural response of thin-walled cylindrical shell type composite configurations under axial and bending loads, respectively. The prime motivation to develop this theory arises from its capability to generate simple yet accurate closed-form analytical results that can efficiently charecterize cylindrical composite shell constructions. This work …
Design Of Next Generation Antenna Mounts In Telecommunication Towers With Low Effective Projected Area, Ruben Gregory Puthota Dominic Savio
Design Of Next Generation Antenna Mounts In Telecommunication Towers With Low Effective Projected Area, Ruben Gregory Puthota Dominic Savio
Mechanical and Aerospace Engineering Theses - Archive
Design of new antenna mount with low effective projected area (EPA) and high load carrying capacity for telecommunication towers is the purpose of this thesis. The main aim is to reduce the EPA of the mount against the wind pressure direction at the desired elevation from ground by reducing the mount frame structure parts compared to the previous mount designs used in the market. The model in itself has to withstand its dead weight, operator’s weight along with five antenna-radio units. The new model has been designed with a single horizontal frame and four supporting structure for EPA reduction and …
Characterization Of Flapping Wing Aerodynamics And Flight Dynamics Analysis Using Computational Methods, Alok Ashok Rege
Characterization Of Flapping Wing Aerodynamics And Flight Dynamics Analysis Using Computational Methods, Alok Ashok Rege
Mechanical and Aerospace Engineering Dissertations - Archive
Insect flight comes with a lot of intricacies that cannot be explained by conventional aerodynamics. Even with their small-size, insects have the ability to generate the required aerodynamic forces using high frequency flapping motion of their wings to perform different maneuvers. The maneuverability obtained by these flyers using flapping motion belies the classical aerodynamics theory and calls for a new approach to study this highly unsteady aerodynamics. Research is on to find new ways to realize the flight capabilities of these insects and engineer a micro-flyer which would have various applications, ranging from autonomous pollination of crop fields and oil …
Comprehensive Design Analysis Of Thick Fr-4 Qfn Assemblies For Enhanced Board Level Reliability, Abhishek Nitin Deshpande
Comprehensive Design Analysis Of Thick Fr-4 Qfn Assemblies For Enhanced Board Level Reliability, Abhishek Nitin Deshpande
Mechanical and Aerospace Engineering Theses - Archive
Quad Flat No-lead package (QFN) is one of the most cutting-edge technologies emerged in the market, exhibiting high performance and efficiency with unparalleled cost effectiveness. QFN, a leadless package, is an ideal choice for applications where size, weight thermal and electrical characteristics are critical, particularly in mobile and handheld devices. Applications like automotive, defense and high current circuits require the package to be mounted on thick printed circuit boards (PCB). But using thick PCBs (>3mm) is detrimental to the package reliability. The motivation of this work is to understand the effect of several package parameters affecting reliability and optimize …
Properties Of Microcement Mortar With Nano Particles, Narasimha Reddy Alimeneti
Properties Of Microcement Mortar With Nano Particles, Narasimha Reddy Alimeneti
Civil Engineering Theses - Archive
Carbon nanotubes (CNT) and Carbon nanofibers (CNF) are one of the toughest and stiffest materials in the world presently with extreme properties yet to be discovered in terms of elastic modulus and tensile strength. Due to the advanced properties of these materials they are being used in almost all fields of science at nanolevel and are being used in construction industry recently for improvement of material properties. Microcement is fine ground cement which as half the particle size of ordinary Portland cement. In this research the behavior of cement mortar of micro cement with the addition of nanoparticles is studied.Due …
Effect Of Preformed Chloramines And Chlorine To Ammonia Ratio On The Formation Of N-Nitrosodimethylamine (Ndma) In Trwd East Texas Raw Water Delivery System, Khidir Hamad
Civil Engineering Theses - Archive
Tarrant Regional Water District (TRWD) pumps untreated raw water from Richland Chambers and Cedar Creek reservoirs in East Texas to provide water to several customer cities including Arlington and Fort Worth. TRWD adds chloramines to the pipeline to combat biofilm growth, that reduces pipeline capacity and increases pumping costs, and to control zebra mussels, that clog intake structure screens and the pump wet wells. However, addition of chloramines leads to the formation of N-nitrosodimethylamine (NDMA), a potent carcinogen, by reaction of chloramines with nitrogenous organic precursors possibly present in the raw water. NDMA formation presents a challenge to TRWD because …
Fate Of Bulk Hypochlorite Solutions In Two Water Treatment Facilities, Anna Breytus
Fate Of Bulk Hypochlorite Solutions In Two Water Treatment Facilities, Anna Breytus
Civil Engineering Theses - Archive
Measurement of oxyhalides in various strength hypochlorite solutions has been an issue of importance in the last decade, especially in view of the current aim of Homeland Security to reduce the usage of chlorine gas. Hypochlorite solutions have a potential of introducing disinfection by-products when used for water treatment. Previous works have shown the possibility of high levels of chlorate and perchlorate in high strength hypochlorite solutions. Perchlorate is an endocrine disruptor that inhibits iodide intake by the thyroid, thus reducing the production of essential thyroid hormones. Chlorate also has several adverse effects on the blood and thyroid systems. Perchlorate …
Quantitative Non-Destructive Evaluation Of Rebar Diameter And Corrosion Damage In Concrete Using Ground Penetrating Radar, Md Istiaque Hasan
Quantitative Non-Destructive Evaluation Of Rebar Diameter And Corrosion Damage In Concrete Using Ground Penetrating Radar, Md Istiaque Hasan
Civil Engineering Dissertations - Archive
The purpose of this study is to develop new methods for quantitative estimation of rebar diameter and loss of area of rebar due to corrosion using Ground Penetrating Radar (GPR). The existing methods of determining the rebar diameter using GPR are not accurate and the existing methods for evaluating corrosion using GPR are qualitative. The study included in this dissertation uses a 2.6 GHz antenna to estimate the diameter of rebar using two different approaches. The approaches use digital image processing of GPR ragargrams and maximum normalized reflection amplitude form the rebar to estimate the diameter. A novel method to …
Discrete Element Modeling Of Geogrid Reinforced Granular Media, Asheesh Pradhan
Discrete Element Modeling Of Geogrid Reinforced Granular Media, Asheesh Pradhan
Civil Engineering Dissertations - Archive
Geogrids have proven to be economical solution in improving ground conditions for construction in foundations, retaining walls, railway tracks, and pavements. Hence researchers have started studying the geogrid reinforcement in detail to understand the working of geogrid and parameters affecting it. Following the advent of faster computers and efficient algorithms researcher have started using discrete element method (DEM) to study geogrid reinforcement since DEM provides particulate level of interaction and understanding and is the closest resemblance of the physical phenomenon. However, the research works are widely spread lacking comprehensive review of factors that can affect such models. This research studies …
Transcranial Near Infrared Spectroscopy And Stimulation Of Prefrontal Cognitive Functions In Young Adults, Snehal Niwrutti Hase
Transcranial Near Infrared Spectroscopy And Stimulation Of Prefrontal Cognitive Functions In Young Adults, Snehal Niwrutti Hase
Bioengineering Theses - Archive
Transcranial near infrared stimulation or Low Level Laser Therapy (LLLT) is an innovative technique shown to control neuronal function in cell cultures, animal models and clinical conditions. The aim of this study was to use near infrared spectroscopy (NIRS) to evaluate the physiological and functional effects of LLLT on prefrontal cognitive functions in young healthy adults. This study was divided into two parts: the first part investigated the physiological effects of LLLT and the second investigated the functional effects.The aim of the first part of this study was to explore how a single session of LLLT altered the hemodynamic status …
Measurement Of Cerebral Blood Flow Using Arterial Spin Labeling Method Across Lifespan, Ciwen Wang
Measurement Of Cerebral Blood Flow Using Arterial Spin Labeling Method Across Lifespan, Ciwen Wang
Bioengineering Theses - Archive
Arterial Spin Labeling (ASL) is one family of perfusion-weighted contrast imaging techniques of Magnetic Resonance Imaging (MRI) that measures cerebral blood flow by labeling spins in arterial blood with inversion and then waiting for a certain period of time for the labeled arterial blood to enter the imaging plane, and then acquiring MR image at the image plane. In compare with PET, ASL is a noninvasive new technology. But as a new technology, it is not very commonly used because of the relatively low signal to noise ratio, less robust mechanism, and more important, there is no standard for clinical …
Build-To-Order Supply Chain Efficiency Using Stochastic Frontier Analysis, Maysaa M. Hamdan
Build-To-Order Supply Chain Efficiency Using Stochastic Frontier Analysis, Maysaa M. Hamdan
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
The Build-to-Order supply chain (BTO-SC) is one agile supply chain that has received great attention in research and industry. Flexibility and responsiveness in mass customization has become a major objective of many companies that lead to the development of BTO-SC. Knowing the efficiency of the BTO-SC and the decision making units responsible for controlling the production process and decision making at different managerial levels is important for resources utilization to stay competitive in such a global market. The main purpose of this study is to measure, compare and analyse the impact of BTO and traditional supply chain on the company's …
Study And Manipulation Of Electron Tunneling Through Quantum Dots, Pradeep Krishna Bhadrachalam
Study And Manipulation Of Electron Tunneling Through Quantum Dots, Pradeep Krishna Bhadrachalam
Material Science and Engineering Dissertations - Archive
Fermi-Dirac distribution is the fundamental property which governs the electron energy distribution in solids. At finite temperatures, Fermi-Dirac thermal smearing of electron energies limits the operation of many electronic, opto-electronic and spintronic devices. Examples include single electron transistors, quantum dot resonant tunnel diodes for single photon detection, and single electron turnstile devices. To overcome this intrinsic limitation of Fermi-Dirac thermal smearing, these devices have typically been operated at cryogenic temperatures. Room temperature operation of these devices could be realized, however, if the thermal smearing of electron energies could be suppressed. Until now, studies in the fields of electron-tunneling refrigerators and …
Compact Modeling Methodology Development For Thermomechanical Assessment In High-End Mobile Applications-Planar And 3d Tsv Packages, Fahad Mirza
Electrical Engineering Theses - Archive
For the last few decades, Moore's law has been driving the microelectronics industry to achieve high performance with small form-factors at a reasonable cost. The continued miniaturization of the transistors has resulted in unparalleled growth in the electronics industry. Further performance increment via size scaling; however, will not be costeffective and difficult to manufacture. To achieve further performance enhancement at a reasonable cost, advanced packaging is being leveraged. Advanced packaging technologies such as System-on-chip (SOCs), system-in-package (SiPs), and 3-D TSV ICs provide significant power and performance enhancement without having the need to migrate to the higher technology node. As planar …
Numerical And Experimental Investigation Of Variable Transportation Cooling For Reusable Thermal Protection Systems, Stefano Gulli
Numerical And Experimental Investigation Of Variable Transportation Cooling For Reusable Thermal Protection Systems, Stefano Gulli
Mechanical and Aerospace Engineering Dissertations - Archive
This research work is focused on the numerical and experimental investigation of the transpiration cooling technique for reusable thermal protection systems. The transpiration cooling has been considered because of its higher cooling effectiveness, with respect to other active cooling techniques, in terms of minimum amount of coolant to be used and minimum interference to the external flow. An innovative approach based on the coupling of the hypersonic boundary layer with the thermal response of porous materials is used to numerically study the thermal management potential of the transpiration cooling technique. The new concept of the variable transpiration is introduced by …
An Ic Design For Wireless Batteryless Multi-Sensing Platform For Biomedical Applications, Young-Sik Seo
An Ic Design For Wireless Batteryless Multi-Sensing Platform For Biomedical Applications, Young-Sik Seo
Electrical Engineering Dissertations - Archive
This work proposed an integrated circuit (IC) design that provides the required functionality for a wireless, batteryless implant. For biomedical applications, the physiological signals can be detected if the parameter of interest can be converted to a change in electrical parameters such as capacitance, resistance or an amperometric signal. The implantable transponder is suitable for sensors that generate one of the aforementioned analog signals. In the proposed universal platform, a voltage-controlled oscillator (VCO) was used to detect variations of voltage or current. Similarly, a relaxation oscillator (RO) was used to detect changes in capacitance or resistance. Thus, the VCO and …
Temperature-Dependence Of Stress-Related Phenomena, Rahmat Saptono
Temperature-Dependence Of Stress-Related Phenomena, Rahmat Saptono
Material Science and Engineering Dissertations - Archive
Efforts have been made to develop a simple but physically sound model. The model was specifically proposed to capture, explain, and estimate the temperature sensitivity and strengthening mechanism phenomena in small volume material with particular reference to the roles grain boundary and surface. Model-inspired phenomenology approach was applied to reveal the key mechanisms and find directions for a more complete constitutive model. The model was developed in the limited space where diffusion is insignificant. It was assumed that the plastic flow was predominantly governed by the thermally-activated process of dislocation glide overcoming barriers. Simple mathematical functions were formulated and evaluated …
Experimental And Numerical Study Of Phase Transition Of Lifepo₄ Material In Lithium Ion Batteries, Md Noor E Alam Siddique
Experimental And Numerical Study Of Phase Transition Of Lifepo₄ Material In Lithium Ion Batteries, Md Noor E Alam Siddique
Material Science and Engineering Dissertations - Archive
Phase transition behavior of LiFePO4 material has been studied in this work. During electrochemical charge/discharge processes, LiFePO4 transforms into FePO4 and this electrochemically driven phase transition of the two-phase system results in a potential plateau in a battery discharge curve. Besides, battery performance, especially under high rates, depends critically on this two-phase transition. However, this phase transition mechanism in the LiFePO4 crystal structure has yet not been understood in details. Developing better understanding is essential for designing high performing, safe and stable batteries.Currently available phase transition models for LiFePO4, such as the classical `core-shrinking model' and recently the `domino cascade …
Intraocular Pressure Changes: An Important Determinant Of The Biocompatibility Of Intravitreous Implants, Ashwin Nair, Ling Zou, Hong Weng, Yi-Ting Tsai, Zhibing Hu, Liping Tang
Intraocular Pressure Changes: An Important Determinant Of The Biocompatibility Of Intravitreous Implants, Ashwin Nair, Ling Zou, Hong Weng, Yi-Ting Tsai, Zhibing Hu, Liping Tang
Bioengineering Faculty Publications - Archive
No abstract provided.
Fabrication And Modification Of Implantable Micro-Probes For Neuro-Studies, Hung Viet Cao
Fabrication And Modification Of Implantable Micro-Probes For Neuro-Studies, Hung Viet Cao
Electrical Engineering Dissertations - Archive
In this work, different types of implantable probes fabricated on Si and polyimide substrates for sensing neurotransmitters, recording extracellular action potentials and stimulating the neurons have been developed. Several electrode configurations have been designed for implantation at various locations in the central nervous system. Each probe contains a multi electrode array (MEA) of 3, 5, 7 or 16 metal electrodes (Au or Pt) fabricated by electron-beam evaporation and lift-off processes. For sensing purpose, as a proof-of-principle, dopamine (DA) and L-glutamate sensors have been implemented. The surface of electrodes was modified with nanostructures by different methods appropriate to the substrate and …
Prostate Cancer Detection Using Combined Autofluorescence And Light Reflectance Spectroscopy: Ex Vivo Study Of Human Prostates, Vikrant Sharma, Ephrem O. Olweny, Payal Kapur, Jeffrey A. Cadeddu, Claus G. Roehrborn, Hanli Liu
Prostate Cancer Detection Using Combined Autofluorescence And Light Reflectance Spectroscopy: Ex Vivo Study Of Human Prostates, Vikrant Sharma, Ephrem O. Olweny, Payal Kapur, Jeffrey A. Cadeddu, Claus G. Roehrborn, Hanli Liu
Bioengineering Faculty Publications - Archive
This study was conducted to evaluate the capability of detecting prostate cancer (PCa) using auto-fluorescence lifetime spectroscopy (AFLS) and light reflectance spectroscopy (LRS). AFLS used excitation at 447 nm with four emission wavelengths (532, 562, 632, and 684 nm), where their lifetimes and weights were analyzed using a double exponent model. LRS was measured between 500 and 840 nm and analyzed by a quantitative model to determine hemoglobin concentrations and light scattering. Both AFLS and LRS were taken on n = 724 distinct locations from both prostate capsular (nc = 185) and parenchymal (np = 539) tissues, including PCa tissue, …
Tissue Engineering Bone Using Autologous Progenitor Cells In The Peritoneum, Jinhui Shen, Ramesh Saxena, Cheng Cheng Zhang, Joseph Borrelli Jr., Liping Tang, Ashwin Nair
Tissue Engineering Bone Using Autologous Progenitor Cells In The Peritoneum, Jinhui Shen, Ramesh Saxena, Cheng Cheng Zhang, Joseph Borrelli Jr., Liping Tang, Ashwin Nair
Bioengineering Faculty Publications - Archive
No abstract provided.
Atlas-Guided Volumetric Diffuse Optical Tomography Enhanced By Generalized Linear Model Analysis To Image Risk Decision-Making Responses In Young Adults, Zi-Jing Lin, Lin Li, Mary Cazzell, Hanli Liu
Atlas-Guided Volumetric Diffuse Optical Tomography Enhanced By Generalized Linear Model Analysis To Image Risk Decision-Making Responses In Young Adults, Zi-Jing Lin, Lin Li, Mary Cazzell, Hanli Liu
Bioengineering Faculty Publications - Archive
No abstract provided.
Study Of The Effect Of Wind Speed On Evaporation From Soil Through Integrated Modeling Of The Atmospheric Boundary Layer And Shallow Subsurface, Hossein Davarzani, Kathleen Smits, Ryan M. T Tolene, Tissa Illangasekare
Study Of The Effect Of Wind Speed On Evaporation From Soil Through Integrated Modeling Of The Atmospheric Boundary Layer And Shallow Subsurface, Hossein Davarzani, Kathleen Smits, Ryan M. T Tolene, Tissa Illangasekare
Civil Engineering Faculty Publications - Archive
In an effort to develop methods based on integrating the subsurface to the atmospheric boundary layer to estimate evaporation, we developed a model based on the coupling of Navier-Stokes free flow and Darcy flow in porous medium. The model was tested using experimental data to study the effect of wind speed on evaporation. The model consists of the coupled equations of mass conservation for two-phase flow in porous medium with single-phase flow in the free-flow domain under nonisothermal, nonequilibrium phase change conditions. In this model, the evaporation rate and soil surface temperature and relative humidity at the interface come directly …
A Study On The Effect Of Magnetic Field On The Corrosion Behavior Of Materials, Soundarya Pondichery
A Study On The Effect Of Magnetic Field On The Corrosion Behavior Of Materials, Soundarya Pondichery
Material Science and Engineering Theses - Archive
Corrosion causes deterioration of a material due to its environment. Corrosion control has been one of the biggest challenges in most industries since many years. There are various notable and unknown factors that influence the rate of corrosion of a certain material/environment system. Magnetic fields and their driven effects on an electrochemical system has been recently gained interest. Various magnetic field driven forces occurring in an electrolyte have been reported during an electrochemical reaction. Lorentz force driven convection in the electrolyte, known as MHD effect and paramagnetic gradient forces are reported to be the most effective. This research studies the …
Thermal Conduction And Heat Generation Phenomena In Li-Ion Cells, Stephen Drake
Thermal Conduction And Heat Generation Phenomena In Li-Ion Cells, Stephen Drake
Mechanical and Aerospace Engineering Dissertations - Archive
Cylindrical lithium ion (Li-ion) cells have demonstrated high power density and energy capacity among other energy storage devices. Despite their already widespread use, the thermal transport properties of cylindrical Li-ion batteries are not well documented and understood, while a sizable amount of work has been carried out for electrical, electrochemical, and materials optimization of Li-ion cells. These thermal phenomena are particularly important for high discharge rate batteries. With this uncertainty, if thermophysical properties are not accounted for in thermal models, the result may be a significant under-prediction or over-prediction of the temperature field in a Li-ion cell.Experimental techniques are described …
Unsteady Thrust Measurement Techniques For Pulse Detonation Engines, Dibesh Dhoj Joshi
Unsteady Thrust Measurement Techniques For Pulse Detonation Engines, Dibesh Dhoj Joshi
Mechanical and Aerospace Engineering Dissertations - Archive
Thrust is a critical performance parameter and its correct determination is necessary to characterize an engine. Many conventional thrust measurement techniques prevail. However, further developments are required for correct measurement of thrust in the case of a pulse detonation engine (PDE), since the entire thrust generation process is intermittent. The significant effect of system dynamics in the form of inertial forces, stress wave propagation and reflections initiated in the structure due to detonations and pulse-to-pulse interaction in a fast operating PDE further complicate the thrust measurement process. These complications call for a further, detailed study of the unsteady thrust characteristics. …
Experimental Investigation Of Nucleate Boiling And Thin-Film Evaporation On Enhanced Silicon Surfaces, Shailesh Malla
Experimental Investigation Of Nucleate Boiling And Thin-Film Evaporation On Enhanced Silicon Surfaces, Shailesh Malla
Mechanical and Aerospace Engineering Dissertations - Archive
The present work consists of two major studies. The first study investigates the effects of surface energy or wettability on nucleate pool boiling and the second study investigates the thin-film evaporative cooling for near junction thermal management. For the first study, effects of surface energy or wettability on critical heat flux (CHF) and boiling heat transfer (BHT) of smooth heated surfaces was studied in saturated pool boiling of water at 1 atm. For this purpose hydrophilic and hydrophobic surfaces were created on one side of 1cm x 1cm double-side polished silicon substrates. A resistive heating layer was applied on the …
Interfacial Reaction Of Sn-Based Solder Joint In The Package System, Huandi Gu
Interfacial Reaction Of Sn-Based Solder Joint In The Package System, Huandi Gu
Material Science and Engineering Theses - Archive
Now a day in electronic industry, as the trend of requiring smaller package size with better electronic performance, lead-free solder joints are always required to decrease their sizes. As a result, the reliability of smaller size solder joints has became a critical issue. The primary factor causing the reliability issue of lead-free solder joints is intermetallic compound (IMCs) formation which forming during soldering process and thermal aging process and can significantly affect the mechanical properties of solder joint. In this study, two different size solder joints with same composition (SAC305 with 96.5%Sn, 3.0Ag, 0.5%Cu) are subjected to isothermal aging treatment …