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Articles 2461 - 2490 of 3180
Full-Text Articles in Engineering
Effect Of Structural Design Parameters On Wafer Level Csp Ball Shear Strength And Their Influence On Accelerated Thermal Cycling Reliability, Nikhil R. Lakhkar
Effect Of Structural Design Parameters On Wafer Level Csp Ball Shear Strength And Their Influence On Accelerated Thermal Cycling Reliability, Nikhil R. Lakhkar
Mechanical and Aerospace Engineering Dissertations - Archive
Wafer level chip scale package (WLCSP) is one of the most popular packages due to its size and cost advantages. It is expected that the usage of WLCSP in microelectronics and MEMS industry combined is going to cross 16000 Million Units by 2013. One of the main advantages of implementing WLCSP is its time to market because most of the package is done at the wafer level. Once the wafer processing is completed the package is just diced and mounted on board and the board is ready to go. However, just like any other package WLCSP too is not ideal …
The Effects Of Behavioral, Geometric And Heavy Vehicle Traffic Flow Characteristics On Capacity And Emissions At Roundabouts, Cho Honest Sone
The Effects Of Behavioral, Geometric And Heavy Vehicle Traffic Flow Characteristics On Capacity And Emissions At Roundabouts, Cho Honest Sone
Civil Engineering Theses - Archive
Modern roundabouts, first constructed in England in the early 1960s, are becoming increasingly popular replacements for signalized and stop controlled intersections in the United States. Roundabouts were introduced to replace traditional traffic circles and rotaries. With the characteristics of entering traffic that yield to circulating traffic and geometric constraints that slow entering vehicles, roundabouts have proven to be more efficient than traffic circles and in some cases than signalized and stop-controlled intersections. Roundabouts often require drivers to decelerate from, and reaccelerate to, highway speeds, and can involve one or multiple stops. One concern about congested roundabouts is that vehicle emissions …
Testing & Design Life Modeling Of Polyurea Liners For Potable Water Pipes, Mustafa Z. Kanchwala
Testing & Design Life Modeling Of Polyurea Liners For Potable Water Pipes, Mustafa Z. Kanchwala
Civil Engineering Theses - Archive
Currently, there are various renewal methods available for different applications, among which coatings and linings are most commonly used for the renewal of water pipes. Polyurea is a lining material applied to the interior surface of the deteriorated host pipe using spray technique. It is applied to enhance the structural ability of the pipeline. This thesis presents the preliminary results of an ongoing laboratory testing program designed to investigate the renewal of potable water pipes using polyurea spray lining. This research focuses on predicting the long-term behavior of polyurea composite. The goal of this test was to establish a relationship …
Magnetic Resonance Spectroscopy Study Of Metabolic Profiles In Brain Tumors, Aditya Manoj Patel
Magnetic Resonance Spectroscopy Study Of Metabolic Profiles In Brain Tumors, Aditya Manoj Patel
Bioengineering Theses - Archive
Metabolic profiles in brain tumors were measured using proton (1H) magnetic resonance spectroscopy (MRS) at 3T. Spectra were obtained from normal tissues and tumor mass regions of 6 low-grade gliomas, 7 anaplastic astrocytomas and 23 glioblastoma (GBM) patients, using PRESS at two echo times (TE = 54 and 112 ms). Glutamate (Glu), glutamine (Gln) and lactate (Lac) were well resolved at TE = 112 ms. The ratio of Gln and Glu concentrations, [Gln]/[Glu], was elevated significantly (p < 0.05) in all the tumor types compared to normal tissue. Elevation of Gln was confirmed through [Gln]/[water]; the ratio was increased in all the three tumor types but the increase was significant only in GBM. Glycine (Gly) was increased significantly in GBM. Alanine was detectable from GBM only, indicating its elevation for most malignant tumor. Other observations included significant increases in choline (Cho) and Lac (p < 0.05) and decrease in NAA (N-acetylaspartate), in consistent with prior studies. The creatine to water ratio was observed to decrease in tumor patients but was not significant. Myo-inositol (mIns) was observed to decrease in low grade patients as compared to normal tissue, but was seen to increase with grade of tumor, but was not significant. [Lac]/[water] was significantly higher and [Cho]/[Lac] significantly lower for GBM patients indicating the increase in Lac as compared to normal tissue.Treatment had a significant impact on tumor cells. After radiation therapy the Lac was observed to be elevated significantly and decrease after bevacizumab treatment. [Cho]/[Cr], [Cho]/[NAA], [Gln]/[Glu] and [Cho]/[Gly] was reduced significantly after the bevacizumab treatment. Gly was not detectable after Bevacizumab treatment. Some of the patients showed no infiltrating tumor cells after successful surgery and therapy with ratios close to that of normal tissue. These observations can help in characterizing the effect of various therapies on brain metabolites and tumor cells.
Experimental Studies On Shrinkage Induced Pressure Measurements Of Four Expansive Soils, Varagorn Puljan
Experimental Studies On Shrinkage Induced Pressure Measurements Of Four Expansive Soils, Varagorn Puljan
Civil Engineering Theses - Archive
Civil structures were damaged by expansive soils due to its large volumetric changes caused by moisture fluctuations. During wet and dry season, the ground heaves up and also shrinks noticeably. The significant amount of curling pressure which is induced by soil shrinkage could cause severe damages to the infrastructure. Especially in the eastern and central Texas, pavements encounter severe cracking and premature loss of serviceability. The maintenance costs, in some cases, are greater than the initial construction costs. Residential dwell structures built on problematic expansive soils often become distressed due to volume changes associated with seasonal moisture content variations. This …
Targeted Delivery Of Carbon Nanotubes To Cancer Cells, Pavitra Chakravarty
Targeted Delivery Of Carbon Nanotubes To Cancer Cells, Pavitra Chakravarty
Bioengineering Dissertations - Archive
CD22 is broadly expressed on human B cell lymphomas. Monoclonal anti-CD22 antibodies (MAbs) alone, or coupled to toxins, have been used to selectively target these tumors both in severe combined immunodeficient (SCID) mice with xenografted human lymphomas and in patients. Single-walled carbon nanotubes (CNTs) attached to antibodies or peptides represent another approach to targeting cancer cells. CNTs convert absorbed near-infrared (NIR) light into heat, which can thermally ablate cells in the vicinity of the CNTs. We have made MAb-CNT constructs where the MAb was either noncovalently or covalently coupled to CNTs, and investigated their ability to bind specifically to cells …
Post-Operative Renal Function Analysis Using Visible Dlp® Hyperspectral Imaging System, Abhas Thapa
Post-Operative Renal Function Analysis Using Visible Dlp® Hyperspectral Imaging System, Abhas Thapa
Bioengineering Theses - Archive
Surgical and clinical settings in medical hospitals strive to keep up with technological innovations in order to improve the current healthcare scenario. Hyperspectral imaging (HSI) is a novel technology that addresses this problem. HSI is a non-invasive imaging technique that can provide information on both structural and functional conditions of tissue. This information is very useful particularly in live surgical procedures wherein the surgeons can get real-time feedback of the anatomical and functional changes of tissue, as they perform the operation. Currently available HSI systems are extremely slow and thus impractical for time restricted surgical or clinical uses. Hence, DLP® …
Enhanced Endothelialization On Surface Modified Poly(L-Lactic Acid), Hao Xu
Enhanced Endothelialization On Surface Modified Poly(L-Lactic Acid), Hao Xu
Bioengineering Dissertations - Archive
Current synthetic vascular grafts and polymer-coated drug-eluting stents (DES) have certain limitations, such as thrombosis and restenosis due to the incomplete recovery of vascular endothelial cells on their luminal sides. Surface modification of these materials is a viable method to enhance the endothelialization on them. In this study, we proposed several way to modify poly(L-lactic acid) (PLLA), a promising material for vascular prostheses to enhance the endothelialization on its surface. In the first method, we modified the material surface with deposition of poly(vinylacetic acid) (PVAA) using plasma polymerization. PVAA having different surface densities of -COOH group or film thickness were …
Comprehensive Studies On Deep Soil Mixing And Lightweight Aggregates Applications To Mitigate Approach Slab Settlements, Ekarut Archeewa
Comprehensive Studies On Deep Soil Mixing And Lightweight Aggregates Applications To Mitigate Approach Slab Settlements, Ekarut Archeewa
Civil Engineering Dissertations - Archive
Bridge approach settlement is a common problem to the Transportation Departments nationwide. This uneven transition causes inconvenience to passengers and increases the cost of maintenance and repair of the distressed approach slabs. The Texas Department of Transportation spends millions of dollars annually to mitigate this problem across the state. The potential causes for this problem are numerous and purely site specific. Hence this problem may not have a unique solution. In this research, two methods were selected to mitigate the approach slab settlements. The first one is an improvement of ground foundation technique by using Deep Soil Mixing (DSM) columns …
Wide Field Of View Imaging Of Premotor And Sensorimotor Cortex Activation Patterns By Functional Near Infrared Spectroscopy, Pankaj Chand
Wide Field Of View Imaging Of Premotor And Sensorimotor Cortex Activation Patterns By Functional Near Infrared Spectroscopy, Pankaj Chand
Bioengineering Theses - Archive
Functional near infrared spectroscopy (fNIRS) is a non-invasive optical technique which can measure concentration changes of oxygenated (HbO), deoxygenated (HbR), and total hemoglobin (HbT) in brain tissue that are induced by neuronal activation. A major hindrance at present for brain optical imaging research is the limited field of view (FOV) size, which is restricted due to the limited number of source-detector pairs that current fNIRS hardware technology and cost considerations allow. As a result it is challenging to simultaneously capture hemodynamic changes in the premotor, motor and sensory cortex as some of these activations can occur outside the available FOV. …
Novel Animal Model And In Vivo Imaging System To Study Inflammatory Response-Mediated Cancer Metastasis, Cheng-Yu Ko
Novel Animal Model And In Vivo Imaging System To Study Inflammatory Response-Mediated Cancer Metastasis, Cheng-Yu Ko
Bioengineering Dissertations - Archive
Cancer metastasis is the leading cause of death in cancer patients. A vast majority of cancer-related mortality is attributed to this rather than the primary tumor itself, making the understanding of cancer metastasis critically important. Inflammatory responses have been implicated to play an important role in cancer metastasis. However, the investigation of the relationship between inflammation and cancer cell migration is limited by the lack of a reproducible cancer metastasis animal model. To fill the gap, we have recently developed an animal model. This model is composed of a two-step procedure. First, poly-L lactic acid (PLA) microspheres were implanted subcutaneously …
Mechanisms Of Biomaterial Mediated Fibrotic Responses And Strategies To Improve Tissue Reactions To Biomaterial Implants, Paul Todd Thevenot
Mechanisms Of Biomaterial Mediated Fibrotic Responses And Strategies To Improve Tissue Reactions To Biomaterial Implants, Paul Todd Thevenot
Bioengineering Dissertations - Archive
Despite considerable advancements in biomaterial synthesis and modification techniques, most tissue engineering scaffolds elicit fibrotic reactions resulting in implant encapsulation, secluding cells and/or therapeutic agents within a thick collagenous matrix. Therefore, strategies to minimize these responses while improving the functionality of recruited/transplanted cells are required. This work set out to improve the host response to biomaterials and identify what cellular responses were attributed to biomaterial-mediated fibrosis. Two strategies were investigated involving two different targets. In the first approach, PLGA scaffolds were RFGD modified to bear -NH2 (amine), -COOH (carboxyl), and -OH (hydroxyl) groups altering surface wettability and charge properties. Surface …
Investigation Of End-Tidal Carbon Dioxide (Etco₂) And Heart Rate Variations During Sleep Apnea, Aditya Bashaboyina
Investigation Of End-Tidal Carbon Dioxide (Etco₂) And Heart Rate Variations During Sleep Apnea, Aditya Bashaboyina
Bioengineering Theses - Archive
Sleep Apnea is a sleep disorder where limitation or cessation of breathing occurs. It is characterized by abnormalities in the respiratory pattern and quantity of ventilation during sleep. According to a study 4% of men and 2% of women have sleep apnea, which is a sizable sector of the adult population. To analyze end-tidal CO₂ and heart hate variations due to apnea, 8 hr polysomnography (Sleep Consultant. Inc, Fort Worth, Texas) was performed on limited sleep apnea subjects and breath hold maneuvers were performed in awake subjects. In the simulated apnea study, 16 volunteer subjects (age: 29 ± 5 yrs, …
Development Of An Accident Model For Construction Industry, Hoda Alavi
Development Of An Accident Model For Construction Industry, Hoda Alavi
Civil Engineering Theses - Archive
Safety has always been a persistent problem in the construction industry. Construction accidents are a major concern for the construction industry and the researchers. In spite of the role of many construction accident causation models in understanding the accident process, none adequately explain the underlying reasons for construction accidents because of their dynamic nature.To overcome this restriction a new advancement in understanding construction accidents has been proposed by Howell et al (2002) based on the work of Rasmussen (1997). The model recognizes that organizational and individual forces push workers in to hazardous conditions. These forces overcome efforts to impose safe …
Characteristics Of Fresh Municipal Solid Waste, Tashfeena Taufiq
Characteristics Of Fresh Municipal Solid Waste, Tashfeena Taufiq
Civil Engineering Theses - Archive
The characteristics of fresh municipal solid waste (MSW) are critical in planning, designing, operating or upgrading solid waste management systems. Physical composition, moisture content, compacted unit weight, permeability are the most important MSW characteristics to be considered in planning a system. When the landfill is operated as enhanced leachate recirculation (ELR) landfill, the physical and hydraulic characteristics are of particular interest in determining the amount of moisture to be recirculated and to design the leachate recirculation and gas collection systems. The current study presents the physical and hydraulic characteristics of MSW collected from the working face of Denton Landfill. The …
Development Of A Suction-Controlled Resonant Column Apparatus With Self-Contained Bender Elements, Eduardo Alfonso Suescun-Florez
Development Of A Suction-Controlled Resonant Column Apparatus With Self-Contained Bender Elements, Eduardo Alfonso Suescun-Florez
Civil Engineering Theses - Archive
Small-strain soil stiffness properties such as shear modulus, shear wave velocity, and material damping, are key subsoil parameters for an adequate analysis and design of unsaturated earth structures subject to static and non-static loading. Most conventional geotechnical testing techniques, however, are not able to capture this small-strain behavior and, hence, enormously underestimate the true soil stiffness, primarily due to inaccuracies in small-strain measurements. Around the world, a great deal of research efforts has been dedicated to field and laboratory based measurements of soil suction, assessments of soil-water retention properties, and analyses of swell-collapse behavior. However, very few efforts have been …
Multi-Ligand Nanoparticles For Targeted Drug Delivery To The Injured Vascular Wall, Soujanya Kona
Multi-Ligand Nanoparticles For Targeted Drug Delivery To The Injured Vascular Wall, Soujanya Kona
Bioengineering Dissertations - Archive
Pathological conditions like coronary artery disease, acute myocardial infarction, stroke, and peripheral artery diseases as well as cardiovascular interventions used in the treatment of coronary artery diseases such as angioplasty and stenting, damage/injure the blood vessel wall, leading to inflamed or activated endothelial cells that have been implicated in events leading to thrombosis, inflammation, and restenosis. Oral administration of anti-coagulant and anti-inflammatory drugs causes systemic toxicity, bleeding, patient incompliance, and inadequate amounts of drugs at the injured area. Though drug-eluting stents have shown therapeutic benefits, complications such as in-stent restenosis and late thrombosis still remain and are a cause for …
Development Of Orchestrated Stem Cell-Based Regeneration (Oscer) -Strategies To Recruit And Differentiate Autologous Stem Cells For Tissue Regeneration, Ashwin Nair
Bioengineering Dissertations - Archive
Stem cell therapy has shown great promise in curing diseases. However, clinical application of stem cell therapy is often hindered by the lack of reliable sources and convenient methods to recover stem cells. Our laboratory has recently discovered that adult stem cells can be actively recruited via inflammatory chemokines/growth factor. My research was aimed towards the development of a new technology - "Orchestrated Stem Cell-based Regeneration" or OSCeR - to induce stem cell-mediated tissue regeneration by blending stem cell therapy and tissue engineering technology. This work has led to a series of interesting findings as listed below. Shortly after implantation, …
Real Time Location Tool For Precision Tracking Of Passive Uhf Rfid Tags In Two Dimensions, Nasir Kenarangui
Real Time Location Tool For Precision Tracking Of Passive Uhf Rfid Tags In Two Dimensions, Nasir Kenarangui
Electrical Engineering Theses - Archive
This thesis addresses this problem of a precise RTLS (Real Time Location System) by implementing a Passive UHF RFID system. A software is created that connects to an RFID reader and accesses it's functionality to collect the tag's backscatter power which is the RSSI (Received Signal Strength Indicator), and the tag's ID. The software also connects with a web camera, and locates the tags within the camera's point of view by using only the RSSI of the tag. This software is capable of computing the locations of tags by locking on each tag's unique EPC, and marking their location and …
Optimization Of Phev Charging Station, Feiran Huang
Optimization Of Phev Charging Station, Feiran Huang
Electrical Engineering Theses - Archive
Plug-in hybrid vehicles are the most feasible approach towards significantly lowering the consumption of oil and improve fuel economy with today's existing technology. In Electric Power Research Institute and the Natural Resources Defense Council (EPRI-NRDC) 2007 study already proved that PHEVs will reduce emissions if they are broadly adopted. However, the charging infrastructures/station become key factor in the success of prevail of PHEVs.The research of this paper is focusing the operation of the PHEV charging station with battery storage units. The battery units conserve the low price clean energy and discharge when demanded. The on-site installed photovoltaic (PV) and off-site …
Predition Of Torque And Radial Forces In Permanent Magnet Synchronous Machines Using Field Reconstruction Method, Banharn Sutthiphornsombat
Predition Of Torque And Radial Forces In Permanent Magnet Synchronous Machines Using Field Reconstruction Method, Banharn Sutthiphornsombat
Electrical Engineering Theses - Archive
Due to their high torque-to-loss ratio, permanent magnet synchronous machines (PMSM) have received increasing attention in automotive applications over the past decade. Because of this unique characteristics, many applications have utilized PMSM. In addition to high efficiency, quiet operation of the machines is desirable in automotive, naval and military applications. In order to operate at high efficiency quietly, the torque pulsation or torque ripple needs to be monitored and mitigated accurately. Magnitude of the torque ripple is influenced by the magnetic design (cogging torque) and excitation, and the pattern of ripple is affected by the machine's geometry (stator slots).Field reconstruction …
Convert Uhf Rfid Tag From Passive To Semi-Passive Tag Using External Power Sources, Tanvi Mehta
Convert Uhf Rfid Tag From Passive To Semi-Passive Tag Using External Power Sources, Tanvi Mehta
Electrical Engineering Theses - Archive
In this thesis, I present novel circuit designs that convert a passive radio frequency identification (RFID) tag into a semi-passive RFID tag. Passive RFID tags are relatively inexpensive to purchase and to integrate into objects and devices. However, in some environments and on some objects the performance of the pure passive tags is not sufficient for the intended applications. A semi-passive tag, in comparison to a pure passive tag, has significantly greater communication range since the semi-passive tag derives its operational power from an on-tag power source instead of just from an interrogator's communication signal. As a result, semi-passive tags …
Tutorial On Functionality And Performance Of Uu Link (Air Interface) Of Lte System, Prashant Srivastava
Tutorial On Functionality And Performance Of Uu Link (Air Interface) Of Lte System, Prashant Srivastava
Electrical Engineering Theses - Archive
In this thesis we have discussed about the air interface for LTE. We have shown the extensive details of the two different types of access that is downlink access- Orthogonal frequency multiple access (OFDMA) and uplink access- Single carrier frequency division multiple access (SC-FDMA).We started with basic concepts about these techniques and proceeded ahead by discussing the operation and design of both types of methods. Also we have shown the transmission chain for downlink and uplink showing step by step that how the data and control information are transmitted over air in LTE. We have presented a brief overview of …
Optimal Output Gain Algorithm For Feed-Forward Network Training, Babu Hemanth Kumar Aswathappa
Optimal Output Gain Algorithm For Feed-Forward Network Training, Babu Hemanth Kumar Aswathappa
Electrical Engineering Theses - Archive
A batch training algorithm for feed-forward networks is proposed which uses Newton's method to estimate a vector of optimal scaling factors for output errors in the network. Using this vector, backpropagation is used to modify weights feeding into the hidden units. Linear equations are then solved for the network's output weights. Elements of the new method's Gauss-Newton Hessian matrix are shown to be weighted sums of elements from the total network's Hessian. The effect of output transformation on training a feed-forward network is reviewed and explained, using the concept of equivalent networks. In several examples, the new method performs better …
Improved Classification In Flat Networks, Madhu Gannapal
Improved Classification In Flat Networks, Madhu Gannapal
Electrical Engineering Theses - Archive
It is shown that optimal flat networks can be found as solutions to least squares problems. An algorithm is presented to improve existing classifier training methods by changing the desired outputs. The algorithm is based on minimum probability of error. The algorithm's performance is compared with those of other algorithms including the Bayes Gaussian classifier. The Convergence of training and the effects of outliers are analyzed in all the algorithms presented here.
A Tutorial On The Functionality On Core Network Mobility, Jatinder Jasbir Singh
A Tutorial On The Functionality On Core Network Mobility, Jatinder Jasbir Singh
Electrical Engineering Theses - Archive
Long Term Evolution (LTE) is next generation Mobile Broadband Technology, which promises to offer significantly higher data rates, better quality, and more economical. Many of the service providers are planning to offer this service by 2010-2012. LTE is vast change in the telecommunication industry from circuit switched network to packet switched network and now all IP-network. In the fast changing mobile telecommunications seamless handover is important for any technology to succeed. It is desirable and beneficial from operator as well as user perspective to have seamless handover with cost effectiveness, enhanced features, and location independence not only in the case …
H.264 Standard Based Side Information Generation In Wyner-Ziv Coding, Subrahmanya Maira Venkatrav
H.264 Standard Based Side Information Generation In Wyner-Ziv Coding, Subrahmanya Maira Venkatrav
Electrical Engineering Theses - Archive
The traditional video coding involves a high complexity encoder and relatively low complexity decoder. The complexity of the encoder is mainly due to motion estimation [3] and other prediction techniques employed . There is a new paradigm emerging in video coding - Distributed video coding (DVC). This is based on Slepian-Wolf and Wyner-Ziv6 theorems. In Wyner-Ziv video coding, encoder is less complex compared to the decoder. The decoder is very complex due to prediction involved for side information (SI) generation. There is lot of research done previously on linear density parity check codes (LDPC) and H.263 standard based SI generation …
Tutorial On Network Quality And Ims Services Used In Lte, Ayush Maheshwari
Tutorial On Network Quality And Ims Services Used In Lte, Ayush Maheshwari
Electrical Engineering Theses - Archive
3rd Generation or 3G technologies like WCDMA, HSPA and GPRS are very advanced technologies in themselves. They allow data downlink speeds of up to 7Mbps and will soon be offering up to 14Mbps. The number of people using these networks has crossed 70 million users worldwide and with ever increasing users we need to provide a solution to handle the new and improved services which are being designed daily to work on mobile devices. Long Term Evolution (LTE), will be one of the two technologies which will meet the ITU's IMT-Advanced requirements for 4G technologies. 3G Partnership Project (3GPP) is …
Capacitive Strain Sensors For Measurement Of Large Strain For Structural Health Monitoring, Clement Jacob
Capacitive Strain Sensors For Measurement Of Large Strain For Structural Health Monitoring, Clement Jacob
Electrical Engineering Theses - Archive
Structural health monitoring (SHM) is increasingly used to replace time based management, with a more efficient Condition Based Maintenance (CBM). The traditional scheme of scheduling down time for aircraft inspection or periodic evaluation of civil infrastructure costs millions of dollars in maintenance due to either downtime or lack of timely maintenance. SHM involves periodic, real time sampling and analysis of signals, from onboard sensors like accelerometer, pressure, strain or acoustic sensors to determine the condition of the structure. This can be used to carry out immediate repairs as well as predict failure. We report the development of a new high …
Develpoment Of An Electronically Controlled Cold Plasma Reformer For Hydrogen Harvest From Bio-Fuels, Job Brunet
Develpoment Of An Electronically Controlled Cold Plasma Reformer For Hydrogen Harvest From Bio-Fuels, Job Brunet
Electrical Engineering Theses - Archive
The energy demand on the world market due to the limited resources has forced governments and scientists to find an alternative source of fuel to ease the burden on its populous and environment. Moreover, the rate of global warming is increasing with the rate of carbon dioxide released from emissions from coal burning power plants and also from vehicle exhaust. This trend of burn now and fix later has to end and a new source of fuel must be developed. Wind, solar, and even nuclear are great substitutes for reducing the global pollution but a new tangible fuel is required. …