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Articles 1951 - 1980 of 3180

Full-Text Articles in Engineering

Experimental Study On The Effects Of Gaseous Contamination On It Equipment, Rahul Srinivas Raghunathan Jan 2013

Experimental Study On The Effects Of Gaseous Contamination On It Equipment, Rahul Srinivas Raghunathan

Mechanical and Aerospace Engineering Theses - Archive

Every company is trying to reduce their carbon footprint in today's world. The data center industry is no different. To reduce the cooling costs and increase the efficiency, air -side economizers are used. Air-side economizers bring in outside ambient cold air to cool the data center equipment. Through this, we can save on cooling costs. The problem relating to air-side economization is that we have no control over the humidity and contamination. Humidity and contamination go hand in hand, as one influence the other. In the past filters have been used to combat contamination but it has proved to be …

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Development Of Foil Thrust Bearing Test Rig, Rohit Harishchandra Yadav Jan 2013

Development Of Foil Thrust Bearing Test Rig, Rohit Harishchandra Yadav

Mechanical and Aerospace Engineering Theses - Archive

Oil lubricated bearings have been widely used in variety of turbo machinery, though it has its own limitations such as thermal degradation of oil over temperature, complicated oil lubrication system and their maintenance. Commercial application of the air foil bearing (AFB) in Microturbomachinery have been acknowledged. Microturbomachinery term is used in applications with shaft power less than 1000KW and shaft diameter less than 100mm. Microturbomachinery has demanded light weighted, compact, extreme temperature and high speed operation. DN number for oil lubricated bearings and rolling element bearings is very less when compared to foil bearings. Absence of external pressurizing and lubricating …

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Point Measurement Of Detonation Wave Propagation Using Ion Guage, Nitesh Karpakala Manjunatha Gupta Jan 2013

Point Measurement Of Detonation Wave Propagation Using Ion Guage, Nitesh Karpakala Manjunatha Gupta

Mechanical and Aerospace Engineering Theses - Archive

Accurate measurement of detonation wave velocity is important in the study of detonations. Detonation wave velocity is calculated by the ratio of distance between two transducers which the wave front travels over the propagation time. Conventional methods included transducers placed a few cm apart thereby yielding an average velocity of the wave. A gauge was developed in which the transducers were placed a few mm apart so that an effective point measurement of velocity can be determined. Different types of sensors used in determining the detonation wave velocity included pressure, flame and ion. Of the three, the ion sensor was …

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Effect Of Nanoparticle Dispersions In A Binary Nitrate Salt As Thermal Energy Storage Material In Concentrated Solar Power Applications, Bharath Dudda Jan 2013

Effect Of Nanoparticle Dispersions In A Binary Nitrate Salt As Thermal Energy Storage Material In Concentrated Solar Power Applications, Bharath Dudda

Mechanical and Aerospace Engineering Theses - Archive

Despite the huge improvements in the field of solar energy to produce electricity, the high cost of production has been one of the major problems in this field. Concentrated solar power (CSP) uses a number of mirrors to concentrate solar radiant energy onto a single focal point. Electrical power is produced when the concentrated light is converted to heat, which drives a heat engine connected to an electrical power generator. This heat is first stored in a thermal energy storage (TES) and transferred to a heat engine to be converted to electricity and thus TES can provide heat even after …

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Utilization Of Molten Nitrate Salt Nanomaterials For Heat Capacity Enhancement In Solar Power Applications, Ramaprasath Devaradjane Jan 2013

Utilization Of Molten Nitrate Salt Nanomaterials For Heat Capacity Enhancement In Solar Power Applications, Ramaprasath Devaradjane

Mechanical and Aerospace Engineering Theses - Archive

Concentrated solar power (CSP) system use general thermodynamic cycle to produce electricity and thus the system efficiency is mainly determined by the working temperature of heat transfer fluid (HTF). Organic-based HTFs (e.g., mineral oil, ethylene glycol, etc.) were firstly used for this application. However, this has limited the working temperature of CSP around 300 °C since these organic material starts to decompose below 400 °C. Typical liquid salts are thermally stable to high temperatures (500~600 °C). Using these salts as HTF can significantly increase the working temperature and as a result the system efficiency can also be highly enhanced. For …

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Design And Analysis Of A Compression Molded Carbon Composite Wheel Center, Vinoth Kumar Dhananjayan Jan 2013

Design And Analysis Of A Compression Molded Carbon Composite Wheel Center, Vinoth Kumar Dhananjayan

Mechanical and Aerospace Engineering Theses - Archive

Importance of closed mold and short fibers in the manufacture of carbon composite parts was realized based on a study of existing manufacturing processes for thermoset resins as these can improve production volumes, cost reduction of the part, production of near net shape parts eliminating secondary operations and production of parts with near isotropic properties due to random fiber orientation. Compression molding process is the most preferred process as this addresses the problems of fiber damage effectively because of the minimal flow in the material. A brief study was done on the compression molded carbon composite parts in the industry. …

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Integrated Modeling Approach For Solid Oxide Fuel Cell-Based Power Generating System, Jeongpill Ki Jan 2013

Integrated Modeling Approach For Solid Oxide Fuel Cell-Based Power Generating System, Jeongpill Ki

Mechanical and Aerospace Engineering Dissertations - Archive

Solid oxide fuel cell (SOFC) systems have been recognized as the most advanced power generation system with the highest thermal efficiency with a compatibility with a wide variety of hydrocarbon fuels, synthetic gas from coal, hydrogen, etc. As a result of research focused on numerical studies for a tubular type- or a planar type-SOFC, fuel flexibility, design aspects of SOFC, materials, start-up process, and so on, SOFC technologies are remarkably being developed.Currently, most research activities are limited to a component level characterization of single fuel cell stack or material research for catalyst, electrolyte, sealing process, etc. In other words, approaches …

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Development Of Computational Fluid Dynamics (Cfd) Based Erosion Models For Oil And Gas Industry Applications, Deval Pandya Jan 2013

Development Of Computational Fluid Dynamics (Cfd) Based Erosion Models For Oil And Gas Industry Applications, Deval Pandya

Mechanical and Aerospace Engineering Dissertations - Archive

Erosion prediction plays a critical role in different oil and gas industry segments including drill bit manufacturing, measurement & logging while drilling (M&LWD), and reservoir engineering/completions tools. Recently, Computational Fluid Dynamics (CFD) is used to predict erosion due to multiphase flows in complex geometries. Currently used CFD-based erosion models are able to predict erosion regions fairly accurately in various applications but they are highly inaccurate when it comes topredictions of quantities like erosion rate. Predicted quantities within an order of magnitude of the measured values are common and may be considered acceptable for many applications in the industry simply because …

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Advanced Materials Characterization Based On Full Field Deformation Measurements, A Paige Carpentier Jan 2013

Advanced Materials Characterization Based On Full Field Deformation Measurements, A Paige Carpentier

Mechanical and Aerospace Engineering Dissertations - Archive

Accurate stress-strain constitutive properties are essential for understanding the complex deformation and failure mechanisms for materials with highly anisotropic mechanical properties. Among such materials, glass-fiber- and carbon-fiber-reinforced polymer-matrix composites play a critical role in advanced structural designs. The large number of different methods and specimen types currently required to generate three-dimensional allowables for structural design slows down the material characterization. Also, some of the material constitutive properties are never measured due to the prohibitive cost of the specimens needed. This work shows that simple short-beam shear (SBS) specimens are well-suited for measurement of multiple constitutive properties for composite materials and …

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Multi-Objective Design Optimization Of Beol/Fbeol Region During Chip Attachment To Substrate, Hardik Parekh Jan 2013

Multi-Objective Design Optimization Of Beol/Fbeol Region During Chip Attachment To Substrate, Hardik Parekh

Mechanical and Aerospace Engineering Theses - Archive

Semiconductor industry has recognized the need to replace traditional Al/SiO2 interconnects with Cu/Low-k interconnects in the mainstream electronics devices following the latter's impact on power, RC delay, and cross-talk reduction. However due to lower elastic modulus, strength, and poor adhesion characteristic, reliability of the Cu/Low-k interconnects turns out to be a concern for its integration in the back-end-of-line (BEoL). Flip-chip attachment process (cooling from ~200C to room) can result in critical damage in nano-scale Cu/Low-k interconnects. The objective of this study is to improve the reliability of Cu/Low-k interconnects during die attach reflow process for a specific die to substrate …

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Design And Control Of A Smart Bed For Pressure Ulcer Prevention, Zachary Govier Brush Jan 2013

Design And Control Of A Smart Bed For Pressure Ulcer Prevention, Zachary Govier Brush

Mechanical and Aerospace Engineering Theses - Archive

This work details the design, simulation, and experimental testing of a mechanically actuated smart hospital bed for the prevention of pressure ulcers in hospital patients. The smart hospital bed, or Smartbed, is designed to improve the “turning” process currently performed by health care workers, ensuring that patients are turned consistently and decreasing the labor requirement for caregivers. The mechanical structure of the bed is described, along with its advantages over current Smartbed products. Next, dynamic models of the Smartbed actuating systems are discussed along with descriptions of the devised single-unit and overall bed control systems. The control equations determined in …

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Design And Evaluation Of A Chemical Reactor For The Pyrolysis Wood Pellets, Pawarat Bootpakdeetam Jan 2013

Design And Evaluation Of A Chemical Reactor For The Pyrolysis Wood Pellets, Pawarat Bootpakdeetam

Mechanical and Aerospace Engineering Theses - Archive

Currently there is interest in converting waste biomass into valuable products, such as fuels and specialty chemicals. However, the product composition, yield, the energy required to run the reaction, and the required residence time are all factors influence the economics of the process. Estimate of these factors at the laboratory scale is important for evaluating whether a pilot or demonstration scale study is warranted. In this work, a bench-scale chemical reactor was designed and constructed to conduct the batch pyrolysis of pelletized biomass. The reactor was tested using pine wood pellets as the feedstock. The feedstock weight to reactor volume …

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Optimal Design Of Beams, Shivakumar Samala Jan 2013

Optimal Design Of Beams, Shivakumar Samala

Mechanical and Aerospace Engineering Theses - Archive

Beams are basic structural components that are capable of withstanding load primarily by resisting bending. Unlike Euler-Bernoulli beams, Timoshenko beams undergo both shear deformation and rotational effects, making it suitable for analyzing the behavior of thick or short beams, composite beams and beams that are subjected to high frequency excitation when their wave length becomes shorter. This thesis work focuses on optimal design of straight and tapered Timoshenko beams under static and dynamic constraints for rectangular and circular cross sections. In this work Timoshenko beam static and dynamic equations were studied. The finite element method was used for static and …

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Study Of The Capabilities Of Electrowetting On Dielectric Digital Microfluidics (Ewod Dmf) Towards The High Efficient Thin-Film Evaporative Cooling Platform, Jagath B. Yaddessalage Jan 2013

Study Of The Capabilities Of Electrowetting On Dielectric Digital Microfluidics (Ewod Dmf) Towards The High Efficient Thin-Film Evaporative Cooling Platform, Jagath B. Yaddessalage

Mechanical and Aerospace Engineering Dissertations - Archive

With the current technological advancement, the size of the electronic components is being reduced to smaller and compact sizes. In the meantime, the packaging density and power consumption is ever increasing. To tackle this challenge, an efficient cooling technology is required.Thin-film evaporation is a very efficient cooling technology. A practical application using thin-film evaporation is a spray cooling which is known as the cooling method that can handle very high heat flux. However, a random spray of coolant cannot guarantee a thin coolant film, therefore either local dry-out or flooding may occur, which hampers cooling efficiency significantly. Moreover, bulky spraying …

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Airdata Sensor Based Position Estimation And Fault Diagnosis In Aerial Refueling, Hakki Erhan Sevil Jan 2013

Airdata Sensor Based Position Estimation And Fault Diagnosis In Aerial Refueling, Hakki Erhan Sevil

Mechanical and Aerospace Engineering Dissertations - Archive

Aerial refueling is the process of transferring fuel from one aircraft (the tanker) to another (the receiver) during flight. In aerial refueling operations, the receiver aircraft is exposed to nonuniform wind field induced by tanker aircraft, and this nonuniform wind field leads to differences in readings of airdata sensors placed at different locations on the receiver aircraft. There are advantages and disadvantages of this phenomenon. As an advantage, it is used as a mechanism to estimate relative position of the receiver aircraft inside the nonuniform wind field behind the tanker. Using the difference in the measurements from multiple identical sensors, …

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A Semi-Analytical Approach To Obtain Physical Fields In Heterogeneous Materials, Thanuuj S. Pathapallli Jan 2013

A Semi-Analytical Approach To Obtain Physical Fields In Heterogeneous Materials, Thanuuj S. Pathapallli

Mechanical and Aerospace Engineering Dissertations - Archive

Predicting the macroscopic response of heterogeneous materials has been the subject of extensive research in the engineering community, even more so, in the composites guild. With analytical solutions being almost impossible to obtain for such open ended problems, and numerical techniques being computationally expensive, semi-analytical methods are highly sought after. This dissertation is one such effort aimed at presenting a semi-analytical approach that serves as a confluence of effective analytical and numerical techniques, to solve for engineering fields in a heterogeneous material characterized by inclusions embedded in a matrix medium. The approach essentially involves the analytical derivation of permissible functions, …

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Development Of Geopolymer Concrete For Precast Structures, Preeti Shrestha Jan 2013

Development Of Geopolymer Concrete For Precast Structures, Preeti Shrestha

Civil Engineering Theses - Archive

This study presents 'geopolymer' as a new binder to replace Portland cement in concrete to make concrete more environmentally friendly and durable. This utilizes industrial by-products like fly ash which is disposed in landfills. Therefore, the use of geopolymer as a binder in concrete production not only reduces the emission of CO2 because of elimination of cement, but also utilizes an industrial by-product to produce a green and sustainable construction material. In this research, the fly ash and alkaline liquid (mix of sodium hydroxide and sodium silicate) were used as the basic constituents of the geopolymer. More than 1000 cylinders …

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Development Of Finite Element Model For Analysis Of Prestressed Concrete Cylinder Pipe-Embedded Cylinder Pipe With Experimental Comparison, Sangit Rauniyar Jan 2013

Development Of Finite Element Model For Analysis Of Prestressed Concrete Cylinder Pipe-Embedded Cylinder Pipe With Experimental Comparison, Sangit Rauniyar

Civil Engineering Theses - Archive

Prestressed Concrete Cylinder Pipe (PCCP) is a composite pipe that consists ofconcrete and steel, which has layers of concrete core, steel cylinder, prestressing wire andmortar coating. PCCP is generally constructed of two types; a steel cylinder lined with aconcrete core and a steel cylinder embedded in a concrete core. The former type is calledPCCP-Lined Cylinder Pipe (PCCP-LCP) and the latter type is called PCCP-Embedded CylinderPipe (PCCP-ECP). The scope of this paper is limited to PCCP-ECP.PCCP-ECP is a composite material with complex stress phenomenon due to prestressand interaction between different layers of components. A three dimensional non-linear finiteelement model is generated …

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Durability Studies Of Controlled Low Strength Material Using Native Soils As Fine Aggregates, Durga Praveen Reddy Vanga Jan 2013

Durability Studies Of Controlled Low Strength Material Using Native Soils As Fine Aggregates, Durga Praveen Reddy Vanga

Civil Engineering Theses - Archive

Controlled Low Strength Material using native soils as fine aggregates is an effective option in addressing issues relating to strength requirements, sustainability, and project cost. Using native soil in the place of conventional aggregate will greatly reduce the overall project costs and will enhance the sustainability of the project as it eliminates dumping of excavated material in a landfill. CLSM mixes, designed for the particular flowing characteristics as well as the compressive strength should maintain targeted engineering properties throughout its design life period to minimize long term maintenance cost. Though CLSMs do meet the short term strength requirements, their long-term …

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Quantification And Geostatistical Mapping Of Soluble Sulfates In Soils Along A Pipe Line Alignment, Justin David Thomey Jan 2013

Quantification And Geostatistical Mapping Of Soluble Sulfates In Soils Along A Pipe Line Alignment, Justin David Thomey

Civil Engineering Theses - Archive

Sulfate induced heave is a growing concern for civil engineering projects utilizing calcium based soil stabilizers. Therefore, addressing sulfate concentrations in soils is vital to the success of a civil engineering project. Pavement, foundations, tunnels, embankments, pipe lines, etc. are all susceptible to sulfate induced heave if the appropriate conditions and constituents are present. The work presented here within focuses on the soluble sulfate testing completed on six (6) different geologic formations within the Integrated Pipe Line (IPL) alignment of North Texas. The testing and analyses were conducted to identify problematic zones and quantify sulfate values in order to prevent …

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Finite Element Modeling Of Prestressed Girder Strengthening Using Fiber Reinforced Polymer And Codal Comparison, Muruganandam Mohanamurthy Jan 2013

Finite Element Modeling Of Prestressed Girder Strengthening Using Fiber Reinforced Polymer And Codal Comparison, Muruganandam Mohanamurthy

Civil Engineering Theses - Archive

Fiber Reinforced Polymer (FRP) composite materials provide effective and potentially economic solution for rehabilitating and upgrading the existing reinforced and precast concrete bridge structures that have suffered deterioration. Each year, there are a significant number of damaged bridges, mainly due to structural failure, reinforcing steel corrosion or vehicle collision. Using FRP materials has many advantages over other strengthening methods. This study consists of reviewing relevant guidelines, codes, standard practices and manufacturer's specifications that deals with FRP strengthening of damaged concrete bridges based on both U.S and international sources. Based on literature review, the available design guidelines are summarized and compared. …

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Evaluating The Performance Of Controlled Low Strength Materials (Clsms) Prepared Using Sulfate Spiked High Plasticity Clay, Sadikshya Poudel Jan 2013

Evaluating The Performance Of Controlled Low Strength Materials (Clsms) Prepared Using Sulfate Spiked High Plasticity Clay, Sadikshya Poudel

Civil Engineering Theses - Archive

When large scale civil engineering projects such as Integrated PipeLine (IPL) are to be constructed, several factors play a significant role in the successful completion of the project on time and on budget. With pipeline construction, one of the important tasks is excavation, with excavation comes the hauling of the excess excavated trench material to the disposal site. The hauling of unwanted excavated dirt from the site and bringing in select backfill material that meets the project requirements not only adds to the overall cost of the project but also raises concerns about sustainability. Transport of unwanted excavated materials require …

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Leachate Recirculation Modeling Using Vertical Wells In Bioreactor Landfills, Aminollah Ghorbanpourbabakandi Jan 2013

Leachate Recirculation Modeling Using Vertical Wells In Bioreactor Landfills, Aminollah Ghorbanpourbabakandi

Civil Engineering Theses - Archive

Municipal solid waste (MSW) is made up of household and commercial waste. Total MSW generated in USA in 2009 was 243 million tons and 54.3% of this waste generation was landfilled (EPA, 2009). MSW buried in landfills contribute a significant amount of gas (Landfill Gas or LFG) to atmosphere. The landfilled MSW is the third largest methane contributor to the atmosphere.One way to manage the LFG is the concept of bioreactor landfills. A bioreactor landfill is a controlled landfill where liquid and gas conditions are actively managed in order to accelerate or enhance biostabilization of MSW. Biostabilization of MSW is …

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Performance Of Wavelet Denoising And Automatic Detection Of Action Potentials On Simulated And Real Electrneurographic Recordings, Manikandan Ravi Jan 2013

Performance Of Wavelet Denoising And Automatic Detection Of Action Potentials On Simulated And Real Electrneurographic Recordings, Manikandan Ravi

Bioengineering Theses - Archive

About 1 in 200 people living in the U.S have had an amputation at some stage in their lives. Development of neurally controlled artificial limb prosthesis with the ability to finely control motor activity continues to prove difficult for researchers in the field. One approach is to use the signals obtained from the peripheral nerves by placing an intraneural electrode in the nerve. Since this signal is very noisy, much of the useful information is either lost or buried in the noise even after FIR filtering. Furthermore, there is a need for fast, automated detection of action potentials in order …

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Long Gap Peripheral Nerve Reconstruction Using Decellularized Nerve Grafts, Srikanth Vasudevan Jan 2013

Long Gap Peripheral Nerve Reconstruction Using Decellularized Nerve Grafts, Srikanth Vasudevan

Bioengineering Dissertations - Archive

Peripheral nerve injuries that arise as a result of trauma, tumor excision or birth can adversely affect the quality of patient life, leading to lifelong disabilities in some cases. Autologous nerve grafts are the clinical "gold standard" for long gap nerve repair, and allogeneic nerve grafts are considered the next best treatment option. Despite having numerous benefits, autologous nerve grafts are associated with limited supply, longer operation time, risk of infection, painful neuroma formation and most importantly, loss of function at the donor site. Allogeneic nerve grafts require transient immunosuppression, which exposes the patients to risks of infection, toxicity and …

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Testing And Design Life Analysis Of Polyurea Liner Materials, Siavash Ghasemi-Motlagh Jan 2013

Testing And Design Life Analysis Of Polyurea Liner Materials, Siavash Ghasemi-Motlagh

Civil Engineering Theses - Archive

Certainly, water pipes, as part of an underground infrastructure system, play a key role in maintaining quality of life, health, and wellbeing of human kind. As these potable water pipes reach the end of their useful life, they create high maintenance costs, loss of flow capacity, decreased water quality, and increased dissatisfaction.There are several different pipeline renewal techniques available for different applications, among which 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-on technique. It is applied to structurally enhance the …

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Protoporphyrin Ix (Ppix)-Conjugated Self-Lighting Nanoparticles For Photodynamic Therapy: Synthesis And Characterization, Homa Homayoni Jan 2013

Protoporphyrin Ix (Ppix)-Conjugated Self-Lighting Nanoparticles For Photodynamic Therapy: Synthesis And Characterization, Homa Homayoni

Bioengineering Dissertations - Archive

In Photodynamic therapy (PDT) PDT, cancer destruction relies on applying a photosensitizing drug (PS) followed by light. Absorbed light can activate the PS to transfer energy to existing molecules and substrates or to oxygen to generate singlet oxygen which are highly toxic to cells. Protophorphyrin IX (PpIX) is a photosensitizers (PSs) which has FDA approval and an absorbance near the Soret band which is 10 times stronger than the absorbance in Q-band (600nm). Our goal was to design a modality to eliminate of external blue light in addition to increasing the drug's water dispersion which finally may result in enhancing …

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An Investigation Of Concurrent Variations In Blood Oxygen Saturation And Cerebral Blood Flow During Apnea, Jennifer Swittens Jan 2013

An Investigation Of Concurrent Variations In Blood Oxygen Saturation And Cerebral Blood Flow During Apnea, Jennifer Swittens

Bioengineering Theses - Archive

Sleep apnea derived from Greek word "apnoia" which means "without air or temporary interruption in breathing", is a sleep - associated breathing disorder that involves a decrease or complete stop in airflow despite a constant effort to breathe. It is estimated that sleep apnea is prevalent in the US in 18 million people and is approximately 6% of the population.This thesis aims to study the physiological effects of sleep apnea on cerebral blood flow (CBF) and the percentage oxygen saturation (%SaO2), the effect of duration of apnea episode or a breath hold on CBF and %SaO2 and to derive a …

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Establishment And Characterization Of An Animal Model Of Distraction Spinal Cord Injury, Jennifer Elisabeth Stearns Bell Jan 2013

Establishment And Characterization Of An Animal Model Of Distraction Spinal Cord Injury, Jennifer Elisabeth Stearns Bell

Bioengineering Dissertations - Archive

Scoliosis corrective surgery requires the application of multidirectional stress forces to the spinal cord, including those of distraction, in addition to the application of fixation rods for correction of the curved spine deformity. If excessive, spine distraction may result in the development of new neurologic deficits, some as severe as permanent paralysis. Intraoperative monitoring is used to alert the surgeon to possible complications; however, the complex nature of spinal cord injury (SCI) involves a primary mechanical insult to the tissue and/or vasculature that may go undetected by monitoring. This is followed by the activation of widespread secondary injury mechanisms. The …

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Diffuse Optical Tomography To Study The Ischemic Stroke In Rat Models, Zi-Jing Lin Jan 2013

Diffuse Optical Tomography To Study The Ischemic Stroke In Rat Models, Zi-Jing Lin

Bioengineering Dissertations - Archive

Stroke, including ischemic stroke and hemorrhagic stroke, is the major leading cause of death in the United States. More than 80 percent of stroke patients are diagnosed with ischemic stroke, which usually results from blockage of artery in the brain by thrombosis or arterial embolism. Animal Models, which permit powerful genetic and molecular approaches, provide an essential tool to study and understand the basic processes and potential therapeutic interventions for this disease. Significant efforts have been made to closely mimic the changes that occur in humans during and after stroke using animal models. Recent development on near infrared (NIR) diffuse …

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