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2021

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Articles 5191 - 5220 of 9983

Full-Text Articles in Engineering

Development Of An Ultraviolet Absorbance Assay To Estimate Air Entrainer Dosing For Concrete Containing Fly Ash, James Spencer May 2021

Development Of An Ultraviolet Absorbance Assay To Estimate Air Entrainer Dosing For Concrete Containing Fly Ash, James Spencer

Graduate Theses and Dissertations

Fly ash is a coal combustion byproduct that can be used as a supplementary cementitious material (SCM) in concrete, offering benefits such as increased workability, durability, and strength. Fly ash can be used as a partial replacement to cement, reducing concrete productions costs and decreasing disposal in landfills. However, variability of fly ash properties (e.g., carbon content, adsorption site density) confounds estimates of the air entraining admixture (AEA) dose needed to achieve a specified air content in concrete. Air entrainment is needed to improve freeze-thaw resistance and limit concrete cracking. The foam index (FI) test is currently used to estimate …

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What’S The Buzz? A Hands-On, Interdisciplinary, And Fun Way To Learn About Circuits, Energy, Engineering, Bee Communication, And Pollination, Christine L. Moskalik May 2021

What’S The Buzz? A Hands-On, Interdisciplinary, And Fun Way To Learn About Circuits, Energy, Engineering, Bee Communication, And Pollination, Christine L. Moskalik

Publications & Research

How can a simple toothbrush- bot be used to model honey bee communication as well as the role of such communication in pollination? Learners explore basic circuitry through the popular tooth- brush-bot activity, with a spin.

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Nonlinearity In Piezotransistive Iii-Nitride Resonant Microcantilevers, Ferhat Bayram May 2021

Nonlinearity In Piezotransistive Iii-Nitride Resonant Microcantilevers, Ferhat Bayram

All Dissertations

Microcantilevers are an important form of microelectromechanical systems (MEMS) and have been widely used in notable applications including bio sensing, chemical detection, and imaging. Traditionally, laser based optical read-out systems have been used to measure amplitudes of the microcantilever tip oscillations (i.e. in an atomic force microscope (AFM)). However, this technique has several drawbacks including high power requirements and bulkiness that prevent commercializing of microcantilevers based miniaturized sensors. Monitoring oscillations of a cantilever array then also becomes immensely challenging. To overcome these problems, microcantilevers with integrated piezoresistive and piezotransistive deflection transducers have been developed. Because of issues related to piezoresistive …

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Automatic System Restoration For Industrial Power Systems, Anusha Papasani May 2021

Automatic System Restoration For Industrial Power Systems, Anusha Papasani

Electrical Engineering Dissertations - Archive

The power system industry often operates close to its limits to accommodate the increased demand posing a high risk of blackouts. Power system restoration techniques are utilized post breakout with the focus on load pickup and speedy recovery. In traditional heuristic methods, the load is considered to be constant after it is picked. However, from a system operation point of view, the load varies once picked. This is commonly observed in industrial loads. In Industrial systems, loads, which involve many induction motors, are started in sequence. The high starting currents of the induction motors leads to voltage sags that may …

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Resource Allocation And Capacity In Wireless Communications And Networks, Zikai Wang May 2021

Resource Allocation And Capacity In Wireless Communications And Networks, Zikai Wang

Electrical Engineering Dissertations - Archive

How to allocate resources in the era of Big Data in telecommunications becomes a new issue. Smartphone data could be a function of personality, as the smartphone supports interpersonal interaction, and the data collected from the smartphone usage often contains rich customer opinion and behavioral information. A bandwidth allocation method based on smartphone users' personality traits and channel condition is studied in a unified mathematical framework in this dissertation. Personalizing bandwidth allocation could be done by analyzing smartphone users' personality traits, resulting in business intelligence, a smarter and more efficient usage of the limited bandwidth, while taking channel fading conditions …

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Dynamic Equivalent Wind Farm Models For Planning, Operation, And Post-Fault Analyses, Yuhao Zhou May 2021

Dynamic Equivalent Wind Farm Models For Planning, Operation, And Post-Fault Analyses, Yuhao Zhou

Electrical Engineering Dissertations - Archive

With high penetration level of the wind power energy in the power grid, it is necessary to develop robust dynamic wind farm models for stability analysis under different scenarios. However, one single wind generator (WG) contains many parameter and control loops, it’s impractical to apply such detailed high-order model of individual wind turbine for dynamic stability analysis due to its computational burden and availability of the data. Therefore, there’s a need for deriving the dynamic equivalent model (DEM) for the wind farm. In the real world, a wind farm may contain different types of WGs coming from different manufactures/vendors with …

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Beamforming Using Quasi Optical Approach For 5g Backhaul, Pratik Ghate May 2021

Beamforming Using Quasi Optical Approach For 5g Backhaul, Pratik Ghate

Electrical Engineering Dissertations - Archive

A new method is proposed for quasi optical beamforming that will enhance performance of emerging systems such as broad deployment of 5G backhaul communications, Internet of Things (IOT), vehicular networking systems, and unmanned aerial navigation systems. It is a promising approach at higher frequencies to reduce the size, cost and improve efficiency of the beamforming operation. In this investigation candidate lens type structures are designed, studied, and analyzed using different configurations of dielectric wedges, plano-concave lens and dielectric slabs. These structures have cost, power consumption, size, weight, and bandwidth advantages, and are expected to be able to operate to higher …

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A 3d Sers Device For Highly Sensitive Detection Of Organic Chemicals In Liquid, Sankgeeth Vennila Sigamani May 2021

A 3d Sers Device For Highly Sensitive Detection Of Organic Chemicals In Liquid, Sankgeeth Vennila Sigamani

Material Science and Engineering Theses - Archive

Detection of organic chemicals in liquid medium have been gaining utmost attention in recent times. Real time detection and monitoring of a variety of environmental pollutants, explosive materials, chemical agents, and pharmaceutical drugs in liquid medium are of great need in today’s technological advancements. While there are several scattering, emission and spectroscopy techniques in use, Raman spectroscopy is attractive because of its molecular specificity i.e., each molecule has a Raman fingerprint. Raman spectroscopy utilizes the inelastic portion of the scattered wave for detection. But since intensity of inelastic scattering (Raman scattering) is very low, compared to the elastic scattering, low …

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Characterization Of Asphalt/Recycled Plastic Blends Modified By Exfoliated Clay Nanoplatelets, Kate A. Nguyen May 2021

Characterization Of Asphalt/Recycled Plastic Blends Modified By Exfoliated Clay Nanoplatelets, Kate A. Nguyen

Material Science and Engineering Theses - Archive

There is a renewed interest from federal and state transportation agencies as well as the asphalt industry in developing successful utilization of recycled plastics in asphalt pavements. By incorporating a third material into the asphalt/plastic blend, a stimulation of enhanced compatibility between the waste plastics and asphalt can be observed. In this thesis, the need for increased stability and improved mechanical performance of asphalt blends, at low and high temperatures, are addressed through the use of dispersed/exfoliated organic montmorillonite nanoplatelets a.k.a. nanoclay (NC). Previous studies with non-dispersed NC as a modifier in asphalt (AS) and polyethylene (PE) blends reported the …

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Real-Time Material State Assessment Of Composites Using Artificial Intelligence And Its Challenges, Muthu Ram Prabhu Elenchezhian May 2021

Real-Time Material State Assessment Of Composites Using Artificial Intelligence And Its Challenges, Muthu Ram Prabhu Elenchezhian

Mechanical and Aerospace Engineering Dissertations - Archive

Over several decades of careful experimental investigation and exhaustive development of discrete damage analysis methods including integrated computational mechanics methods, our community knows a great deal about how discrete defects such as matrix cracks and defect growth (e.g. delamination) can be predicted in structural composites. For many practical situations controlled by laminated multiaxial composite structures, the loss of performance and “sudden death” end of life is controlled by defect coupling which becomes a precursor to fracture plane development. These interaction sequences are highly dependent on local details of manufacture, design configurations, and loading for a given application material and influenced …

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Cooling Efficiency Improvement Of A Data Center Using Optimized Cabinet Design And Hybrid Cooling With High Inlet Conditions Of Single-Phase Coolant And Air, Uschas Chowdhury May 2021

Cooling Efficiency Improvement Of A Data Center Using Optimized Cabinet Design And Hybrid Cooling With High Inlet Conditions Of Single-Phase Coolant And Air, Uschas Chowdhury

Mechanical and Aerospace Engineering Dissertations - Archive

The objective of this study is to improve and optimize the cooling efficiency of liquid and air cooling from server to room level while applying best practices in the industry. The effect of increased air and coolant temperature has been explored through a literature survey and studies are conducted from device level to room level for air and liquid cooling. Three major aspects are considered. A closed-form air cooling solution is proposed for high-powered racks in a modular data center equipped with in-row coolers. Direct-to-chip liquid cooling technology is extensively studied at the server level for raised air and coolant …

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Impact Of Material Models On Immersion Cooled Electronics Packages And Reliability Assessment For Chip-Package Interaction, Tushar Jashvantbhai Chauhan May 2021

Impact Of Material Models On Immersion Cooled Electronics Packages And Reliability Assessment For Chip-Package Interaction, Tushar Jashvantbhai Chauhan

Mechanical and Aerospace Engineering Dissertations - Archive

The immersion cooling for IT equipment has been around for decades. From thermal energy management perspective, immersion cooling is better than traditional cooling technology. However, there is need for more work in open literature when it comes to impact of immersion cooling on the reliability of IT equipment to make it commercially implemented. Detailed study of material compatibility of the various electronics packaging materials for immersion cooling is essential to understand their failure modes and reliability. The stiffness and thermal expansion are critical material properties for electronics mechanical design. This part of the study mainly focuses on two things. The …

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Development Of A Test Method For Characterizing An Indirect Evaporative Cooling Module For Data Center Cooling Application, Abhijit Rajendra Bhosale May 2021

Development Of A Test Method For Characterizing An Indirect Evaporative Cooling Module For Data Center Cooling Application, Abhijit Rajendra Bhosale

Mechanical and Aerospace Engineering Theses - Archive

Evaporative cooling is a smarter way of maintaining optimum operating conditions in data centers. Indirect Evaporative Cooling (IEC) provides the advantage of cooling without changing the humidity of the Data Center (DC) air. We analyze and develop a method of testing to help build IEC modules at larger scales with improved characterization that is intended to help DC engineers achieve stringent Power Utilization Efficiency (PUE) targets by expending minimum power. We study the design parameters pertinent to sizing an IEC module used in DC cooling and develop a test method while technically selecting the components involved. The module is planned …

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Sensitivity Study Of Calibrated Data Center Models To Minimize Site Survey Time Using Cfd, Saurabh Singh May 2021

Sensitivity Study Of Calibrated Data Center Models To Minimize Site Survey Time Using Cfd, Saurabh Singh

Mechanical and Aerospace Engineering Theses - Archive

Data center (DC) consists of components like cooling pipes, data cables, power conduits, etc. To analyze the thermal behavior of DC using computational fluid dynamics, virtual model of DC is required. To build this virtual model, data is required regarding the different components like size, location and defining parameters. Site surveys are required to collect this data. Data collection is important to build an accurate model. There is lack of guidance with respect to which components are crucial to achieve level of accuracy in computational model. Sensitivity study can be used to determine accuracy achieved by introducing simplification in component …

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Effectiveness Of Closed-Loop Inverse-Kinematic Landmark Navigation Method On Drifting And Heading Errors Of Imprecise Multi-Legged Robots, Thong Quang Nguyen May 2021

Effectiveness Of Closed-Loop Inverse-Kinematic Landmark Navigation Method On Drifting And Heading Errors Of Imprecise Multi-Legged Robots, Thong Quang Nguyen

Mechanical and Aerospace Engineering Theses - Archive

This work addresses the effectiveness of a closed-loop inverse-kinematic control methodology on alleviating drifting and heading errors in the walking and turning of a hexapod robot. Most work in this area focuses on stability, hardware design, and control. This work is aimed at controlling imprecise hardware on unknown structured environments. The proposed controller uses a camera and an ultrasonic sensor as sensory feedback. It also uses the well-known tripod gait for locomotion, implemented with the closed-loop inverse-kinematic method. Experimental results show the effectiveness of this approach in walking and turning the hexapod on an unknown surface.

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Thermal Design Analysis Of Server Chassis Manifolds For Liquid Cooled Servers Using Cfd, Kaustubh Kantilal Adsul May 2021

Thermal Design Analysis Of Server Chassis Manifolds For Liquid Cooled Servers Using Cfd, Kaustubh Kantilal Adsul

Mechanical and Aerospace Engineering Theses - Archive

Direct-to-chip liquid cooling is one of the most popular methods in data center thermal management when it comes to cooling high chip power densities. A cold plate-based liquid cooling system contains various components such as pumps, data center room, and rack-level manifolds, and server chassis-level manifold. Efficient coolant distribution to the heat-dissipating cold plates plays an important role in both the thermal and hydraulic performance of the server. It is, thus, very important to design and manufacture server chassis manifold geometry that can perform efficiently under the anticipated heat loads and coolant flow rates. In the present thesis, two such …

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Design And Cfd Analysis Of A Tank Solution For Natural Convection Based Single-Phase Immersion Cooling Of Servers, Siddhesh Manohar Khanvilkar May 2021

Design And Cfd Analysis Of A Tank Solution For Natural Convection Based Single-Phase Immersion Cooling Of Servers, Siddhesh Manohar Khanvilkar

Mechanical and Aerospace Engineering Theses - Archive

The issue of thermal management of data centers is becoming even more challenging with increasing chip power densities. This has been primarily driven by increasing demands in artificial intelligence and machine learning-based applications, increased usage of cloud-based services, and high-performance computing. The development of these applications has led to a corresponding increment in high performance and high power density CPUs and GPUs. Liquid cooling technologies are outperforming the traditional air cooling approach in dissipating high heat fluxes. Out of these technologies, single-phase immersion cooling offers advantages like substantially lower PUE values, simplified data center infrastructure, ease of deployment for edge …

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Design, Development, And Characterization Of A Flow Control Device For Dynamic Cooling Liquid-Cooled Servers, Hardik Yashwant Hurnekar May 2021

Design, Development, And Characterization Of A Flow Control Device For Dynamic Cooling Liquid-Cooled Servers, Hardik Yashwant Hurnekar

Mechanical and Aerospace Engineering Theses - Archive

Since the early ’60s, based on Moore’s law, transistor density has been doubling every generation resulting in increased power density. Eventually, in the early ’90s, we moved from constant voltage to constant electric field and corresponding constant power for a given area during technology changes. Dennard’s model of voltage scaling and corresponding constant power ceased, ending improved performance gains in the early 2000s that again required techniques to mitigate increased power and corresponding temperature. The performance gain is being achieved by using multi-core processors, leading to non-uniform power distribution and localized high temperatures making cooling very challenging. Direct cold plate-based …

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Quantifying Blood Flow Patterns In The Pediatric Heart Using Blood Speckle Imaging, Harrison Dean May 2021

Quantifying Blood Flow Patterns In The Pediatric Heart Using Blood Speckle Imaging, Harrison Dean

Biomedical Engineering Undergraduate Honors Theses

Congenital Heart Disease (CHD) is the most common type of congenital disease worldwide. Echocardiography using Doppler ultrasound is typically used to diagnose and monitor CHD; however, it is angle-dependent in nature and as a result is limited in its ability to accurately evaluate ventricular function. Blood Speckle Imaging (BSI) is a novel, angle-independent imaging modality that provides detailed blood flow information and visualization within a given area using speckle-tracking. In this study, velocity-field information obtained from BSI was used to calculate flow parameters such as kinetic energy (KE) and circulation using a custom created MATLAB program. BSI was performed on …

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Study Of Electromigration Failure Mechanism In Micro Solder Joint, Hossein Madanipour May 2021

Study Of Electromigration Failure Mechanism In Micro Solder Joint, Hossein Madanipour

Material Science and Engineering Dissertations - Archive

The miniaturizing trend for advanced electronic devices has motivated the microelectronic industries to pursue device integration and packaging technology based on the micro-bump solder joint. This type of the joint enables devices with far higher interconnect density and miniaturized form factors which are ideal for mobile applications. The focus of this research is to conduct comprehensive investigation on the electromigration (EM) reliability of micro solder joint. For that purpose, a series of EM tests on micro solder joints under direct current (DC) load was conducted with variation in the contributing factors to EM failure, including solder joint arrangement (change of …

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Metal Nanodendrites And Their Applications As 3d Surface Enhanced Scattering (Sers) Substrates, Aseem Athavale May 2021

Metal Nanodendrites And Their Applications As 3d Surface Enhanced Scattering (Sers) Substrates, Aseem Athavale

Material Science and Engineering Dissertations - Archive

Ultrasensitive detection of chemicals and biological analytes has been a focus of a lot of studies in the recent years. In this search for the versatile detection technique, Surface Enhanced Raman Spectroscopy (SERS) has proved to be one powerful method. SERS is a powerful vibrational spectroscopy technique that allows for label free ultrasensitive detection. This method utilizes the Localized Surface Plasmon resonance (LSPR) effect of nanoparticles. LSPR effect is profound in noble metals such as silver (Ag) and gold (Au). We have developed a novel SERS substrate using Ag dendrites that can be applied as a ready-to-use device in a …

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Biomechanical Studies Of Developing Zebrafish Heart In-Vivo, Nabid Salehin May 2021

Biomechanical Studies Of Developing Zebrafish Heart In-Vivo, Nabid Salehin

Bioengineering Dissertations - Archive

The heart is an electrically controlled mechanical pump that provides the cardiac output required by the body to function properly and flexibly adapts to changing demand and working conditions. In vertebrate embryos, the heart is the first organ that starts functioning and the function is initiated well before structural organogenesis is complete, with its early mechanical function affecting its own development. During development, the heart transforms from a valveless linear peristaltic tube into a multi-chambered pulsatile pump with blood flow regulating valves while continuing to serve the metabolic needs of the embryo. The zebrafish has emerged as a popular model …

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Non-Invasive Profiling Of Molecular Markers In Brain Gliomas Using Deep Learning And Magnetic Resonance Images, Chandan Ganesh Bangalore Yogananda May 2021

Non-Invasive Profiling Of Molecular Markers In Brain Gliomas Using Deep Learning And Magnetic Resonance Images, Chandan Ganesh Bangalore Yogananda

Bioengineering Dissertations - Archive

Gliomas account for the most common malignant primary brain tumors in both pediatric and adult populations. They arise from glial cells and are divided into low grade and high-grade gliomas with significant differences in patient survival. Patients with aggressive high-grade gliomas have life expectancies of less than 2 years. Glioblastoma (GBM) are aggressive brain tumors classified by the world health organization (WHO) as stage IV brain cancer. The overall survival for GBM patients is poor and is in the range of 12 to 15 months. These tumors are typically treated by surgery, followed by radiotherapy and chemotherapy. Gliomas often consist …

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Vistas: Vocational Immersive Storytelling Training And Support Framework For Augmenting Work Performance, Sanika Doolani May 2021

Vistas: Vocational Immersive Storytelling Training And Support Framework For Augmenting Work Performance, Sanika Doolani

Civil Engineering Theses - Archive

Training and assessment of novice workers are the most vital part of any vocational industry. Innovations in science and technology have led to the creation of new industries and occupations, enhanced productivity and quality of work-life, and increased the potential for more people to participate in the workforce. However, these come at the risk and disadvantage of an increased cost of training and lack of proper training in industries, such as manufacturing. Recently, the use of Extended Reality (XR) systems has been on the rise to tackle various domains such as training, education, safety, etc. With the recent advances in …

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Numerical Simulation Of Anchor Group Effects On Concrete Breakout Strength Within Steel Fiber Reinforced Concrete, Harjasdeep Singh Chauhan May 2021

Numerical Simulation Of Anchor Group Effects On Concrete Breakout Strength Within Steel Fiber Reinforced Concrete, Harjasdeep Singh Chauhan

Civil Engineering Theses - Archive

This study aims to investigate numerically, the effect of anchor groups on concrete breakout strength using nonlinear finite element analysis. Steel headed studs were cast in place within concrete of different amounts of steel fibers. Different proportions of steel fibers (0%, 0.5%, 1%, 1.5%) were utilized within steel fiber reinforced concrete (SFRC) for the numerical simulation. The physical properties of SFRC were modelled with respect to its composite compressive and tensile strength obtained from the experiments. The analysis was conducted on the concrete breakout strength of anchor bolts within SFRC. A good agreement was achieved between the numerical and the …

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Metabolic And Electrophysiological Effects Of Transcranial Photobiomodulation (Pbm) And Multi-Wavelength Pbm, Tyrell Byrom Pruitt May 2021

Metabolic And Electrophysiological Effects Of Transcranial Photobiomodulation (Pbm) And Multi-Wavelength Pbm, Tyrell Byrom Pruitt

Bioengineering Dissertations - Archive

Photobiomodulation (PBM) with near infrared light may become a non-invasive, effective clinical tool after it is understood well for its mechanism of action. In my dissertation research, I have addressed three research questions as three aims to achieve. Aim 1 was to investigate and demonstrate the reproducibility of the effects of transcranial PBM (tPBM) with 1064-nm laser delivered on the right forehead of separate groups of healthy humans measured using different experiment setups in separate sites and years. In Chapter 2, I reported sham-controlled, tPBM-induced concentration increases in oxygenated hemoglobin (∆[HbO]) and oxidized cytochrome c oxidase (∆[oxi-CCO]) in both young …

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An In Vitro Model To Study The Role Of Iol: Lens Capsule Interactions In Posterior Capsule Opacification, Arjun Jaitli May 2021

An In Vitro Model To Study The Role Of Iol: Lens Capsule Interactions In Posterior Capsule Opacification, Arjun Jaitli

Bioengineering Dissertations - Archive

Posterior capsule opacification (PCO) is the most common complication associated with intraocular lens (IOL) implantation. Unfortunately, current in vitro models cannot be used to assess the potential of PCO due to their failure to simulate posterior curvature of the lens capsule (LC), contradicting observations, different testing conditions and inherent challenges associated with use of human capsular bag models, cells and other tissue substrates. To overcome such a challenge, a new system to study IOL: LC interaction and potentially predict PCO was developed in this effort. It is believed that the interactions between an IOL and the lens capsule (LC) may …

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Effect Of Modified Moisture Barrier In Mitigating Pavement Distresses Due To Expansive Subgrade, Pratibha Pandey May 2021

Effect Of Modified Moisture Barrier In Mitigating Pavement Distresses Due To Expansive Subgrade, Pratibha Pandey

Civil Engineering Dissertations - Archive

Surficial distresses in roadways of Texas are very common due to presence of high plastic clayey soil in the subgrade. Increased sensitivity of high plastic clay towards seasonal moisture change results in repeated swelling and shrinkage, and ultimately the development of pavement cracks. Annual expenses of such distresses impose huge financial liability to maintenance authorities. Studies have indicated rainwater intrusion into underlying expansive subgrade soil coupled with inadequate drainage as the main cause of pavement damage in semi-arid regions. The inability of drainage layer to laterally drain the excess moisture may lead to moisture accumulation within the base layer which …

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Evaluation And Retrofitting Of Prestressed Concrete Girder Bridge With Excessive Vibration, Ikram Hasan Efaz May 2021

Evaluation And Retrofitting Of Prestressed Concrete Girder Bridge With Excessive Vibration, Ikram Hasan Efaz

Civil Engineering Dissertations - Archive

Vibration of a highway bridges is a serviceability issue according to American Association of State Highway and Transportation Officials (AASHTO). Though vibration is one of the primary reasons of bridge deck cracking, AASHTO only has a deflection limit to counterpart vibration which is not adequate according to many researchers. For instance, SH-75 SB Bridge over Wilson Creek in McKinney, Texas was observed to have excessive vibration and cracking on the concrete deck. To evaluate the condition of the bridge, Ground Penetrating Radar (GPR) and Impact Echo (IE) were used on the deck as Non-Destructive Evaluation (NDE) methods. A diagnostic load …

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Effect Of Sludge Content On Different Types Of Food Waste Degradation In Anaerobic Digester, Mumtahina Binte Latif May 2021

Effect Of Sludge Content On Different Types Of Food Waste Degradation In Anaerobic Digester, Mumtahina Binte Latif

Civil Engineering Theses - Archive

Food waste (FW) is the second-largest component in landfills which impacts environments adversely by generating excessive leachate and greenhouse gas. Generally, conventional anaerobic digester and composting can be used for FW disposal. However, the former is highly expensive while the latter is energy inefficient. In contrast, household or community level underground anaerobic digester offers a cost-efficient solution as well as retrieves valuable energy from FW. The addition of nutrients such as sludge to organic waste especially FW accelerates the production of energy by limiting volatile fatty acid (VFA) accumulation. The objective of the current study is to find out the …

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