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Articles 2131 - 2160 of 3180

Full-Text Articles in Engineering

Thermal Analysis Of High End Servers Based On Development Of Detail Model And Experiments, Shreyas Sampath Jan 2012

Thermal Analysis Of High End Servers Based On Development Of Detail Model And Experiments, Shreyas Sampath

Mechanical and Aerospace Engineering Theses - Archive

Thermal management of an efficient data center can be primarily dictated by efficient servers. Continued increase in power density and power dissipation of high end processors, thermal analysis and management has made it strategically important in the challenge of advanced thermal solutions. Present day CFD software provides powerful tools to create very accurate fluid and heat transfer solutions. Validation of a detailed model of a server in CFD corresponds to accurate flow and temperature models and these detailed server models are the foundational blocks for accurate data center thermal management solutions. In this research, an experimental study of the thermal …

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Performance Evaluation And Finite Element Analysis Of Fiber Reinforced Precast Concrete Underground Structures, Ashley Wilson Jan 2012

Performance Evaluation And Finite Element Analysis Of Fiber Reinforced Precast Concrete Underground Structures, Ashley Wilson

Civil Engineering Theses - Archive

This study aimed at evaluating the performance of BASF Synthetic and Steel fibers as alternative reinforcements in concrete pipes. A total of 93 synthetic fiber and 60 steel fiber reinforced pipes were produced and tested based on the ASTM C497 in order to have a benchmark for comparison with conventionally reinforced concrete pipes. Three production sites with different production equipment were used in different geographical locations in the United States. Standard ASTM C76 diameters of up to 36 in. with "Wall-B" and "Wall-C" were used in this study for both synthetic and steel fibers. Vertical and horizontal load-deformation plots for …

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Engineering Behavior Of Lime Treated High Sulfate Soils, Ahmed Hassan Mohamed Gaily Jan 2012

Engineering Behavior Of Lime Treated High Sulfate Soils, Ahmed Hassan Mohamed Gaily

Civil Engineering Theses - Archive

Regardless of increased knowledge and awareness of sulfate heave, the Texas Department of Transportation (TxDOT) continues to experience pavement failures during and immediately after construction on transportation infrastructures intended to last at least 20 years. Failures are predominantly observed in sites where high sulfate soils of 8,000 ppm or higher levels. Many of these failures are attributed to sulfate-induced heave where an expansive mineral called Ettringite is formed from calcium-based stabilizers (lime or cement) reacting with water, clay, and sulfates. The reactions responsible for Ettringite formation are extremely complex which make generalizations concerning the rate and magnitude of heaving in …

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Comparative Application Of Two Nanoparticles In Cement Mortar, Vinoth Mohanam Jan 2012

Comparative Application Of Two Nanoparticles In Cement Mortar, Vinoth Mohanam

Civil Engineering Theses - Archive

Carbon Nanotubes (CNTs) and Carbon Nanofibers (CNFs) are two of the most promising advanced materials in the construction industry due to their excellent material properties. In this study, their application in cement mortar is studied comparatively as possible choice for concrete repair. CNT and CNF have very high aspect ratio due to which the Van der Wal forces between the CNT and CNF tend to agglomerate; thus forming bundles. In order to achieve proper dispersion, ultrasonic energy was used to disperse the CNT and CNF in the aqueous solution. The mechanical properties such as compressive strength and flexural strength of …

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The Effects Of Climate, Soil, And Vegetation On The Design Of Water Balance Covers For Solid Waste Landfills In Texas, Salman Baig Jan 2012

The Effects Of Climate, Soil, And Vegetation On The Design Of Water Balance Covers For Solid Waste Landfills In Texas, Salman Baig

Civil Engineering Theses - Archive

The purpose of this study is to determine the effects of climate, soil, and vegetation on the design of water balance (WB) covers for solid waste landfills in Texas. This study was conducted using water balance software (UNSAT-H model) that considers unsaturated soil hydraulics and plant water uptake. To date, limited research has been conducted for WB covers in Texas. Texas is located in the central region of the United States and encounters approximately nine distinct 5 inch precipitation increments or ranges, unlike any other state in the United States. Texas includes various climate regions and is a favorable choice …

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Effect Of Saline Water On Landfill Gas Generation Of Municipal Solid Waste, Yogavathani Sivanesan Jan 2012

Effect Of Saline Water On Landfill Gas Generation Of Municipal Solid Waste, Yogavathani Sivanesan

Civil Engineering Theses - Archive

The Enhanced Leachate Recirculation (ELR) landfills operation results in rapid waste stabilization, waste decomposition and increased rate of gas generation. However, operating landfill as an ELR landfill requires availability of sufficient amount of fresh water in close proximity to the landfill facility. In coastal regions, where fresh water supplies may be scarce, available saline water may be considered for ELR operation. However, the effects of saline water on the decomposition solid waste and landfill gas generation are unknown and need to be investigated., The objectives of the current research are to investigate the effects of adding and/or recirculating saline water …

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Identifying Issues Impacting Productivity Of Box Jacking Projects, Bhaumi Bhavan Chaurasia Jan 2012

Identifying Issues Impacting Productivity Of Box Jacking Projects, Bhaumi Bhavan Chaurasia

Civil Engineering Theses - Archive

Jacking is a trenchless construction technique used for installing underground pipeline system. Jacking method is more widely used for upgrading under capacity culverts and drainage structures under roads and railroad tracks. Also, this method is used for installing underground pipelines such as watermains, sewers etc.in populated and developed urban areas. In this method, culverts (segments) are installed through the ground from an entry shaft to an exit shaft. During the excavation and spoil removal processes, workers are required to be inside the pipe, this is essentially what separates pipe jacking trenchless construction method from microtunneling technology. The minimum recommended diameter …

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Effect Of Nano Zero Valent Iron On Degradation Of Municipal Solid Waste In Bioreactor Landfills, Meenakshi Gangopadhyay Jan 2012

Effect Of Nano Zero Valent Iron On Degradation Of Municipal Solid Waste In Bioreactor Landfills, Meenakshi Gangopadhyay

Civil Engineering Theses - Archive

Nanotechnology has substantial potential for reducing contamination, toxicity and overall human health hazards and environmental risks. In recent times, nano zero valent iron has proved to be effective in contaminant reduction and pollution control. Iron is an important micronutrient for the microbes involved in the anaerobic decomposition of solid waste in bioreactor landfills. Landfill leachate sometimes contains toxic compounds which nano zero valent iron has proven to be very effective in removing, particularly chlorinated organics, heavy metals, and odorous sulfides. Iron can also potentially increase landfill methane generation by removing long chain fatty acids and sulfides that inhibit methanogenesis.nZVI materials …

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Investigations Into Causes Of Failure Of Regenerative Peripheral Nerve Interfaces, R. Collins Watson Jan 2012

Investigations Into Causes Of Failure Of Regenerative Peripheral Nerve Interfaces, R. Collins Watson

Bioengineering Dissertations - Archive

All highly selective methods of neural interfacing for mental control of a robotic prosthesis tested to date have exhibited high rates of failure over time. Regenerative peripheral nerve interfaces (RPNIs) may offer the greatest potential among the proposed technologies for providing the number of degrees of freedom necessary to control a robotic limb, but are unacceptable for clinical use due to several shortcomings of current technology: (1) all RPNIs tested to date have exhibited signal loss over time due to biological mechanisms of rejection of implanted electrodes; (2) all chronically tested interfaces have suffered from high rates of device failure …

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Pleiotrophin Enhance Nerve Regeneration Across Long Gap Peripheral Nerve Defects, Swarup Narayan Dash Jan 2012

Pleiotrophin Enhance Nerve Regeneration Across Long Gap Peripheral Nerve Defects, Swarup Narayan Dash

Bioengineering Dissertations - Archive

Peripheral nerve injuries resulting in extensive loss in nerve continuity pose a challenge in reconstructive surgery. Autografts still remain the treatment of choice for nerve defects despite the need of donor nerve harvest and the associated morbidity of this procedure. In contrast to short gap injuries, isografts achieve sub normal functional recovery for gaps longer than a critical 30 mm length, and simple tubularization methods fail completely. The regenerative failure of peripheral nerves through long gaps can be postulated to the lack of appropriate growth substrate and trophic support. We hypothesize that for successful nerve regeneration across long-gap nerve defects, …

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An Investigation Of Pipe Jacking Loads In Trenchless Technology, Saeed Rahjoo Jan 2012

An Investigation Of Pipe Jacking Loads In Trenchless Technology, Saeed Rahjoo

Civil Engineering Theses - Archive

Pipe jacking is a trenchless technology method of installing pipes under existing facilities such as roads and railroads. Predicting jacking forces is important for planning, design, and construction phases of these projects. The jacking forces dictate shaft or pit locations, thrust block or backstop design, jacking equipment, use of intermediate jacking stations, and pipe bearing capacity. Calculating jacking forces depends on several site and project parameters such as soil and site conditions, lubrication, size of overcut, and steering corrections. Excessive jacking forces can damage the pipe and destabilize the drive shaft, which may stop project progress. There are different methods …

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Performance Of Large Diameter Polyvinyl Chloride (Pvc) Pipes In Water Applications, Pradip P. Deshmukh Jan 2012

Performance Of Large Diameter Polyvinyl Chloride (Pvc) Pipes In Water Applications, Pradip P. Deshmukh

Civil Engineering Theses - Archive

Polyvinyl chloride (PVC) pipes with diameters greater than 24" make up a small fraction of water utilities. Most of the research done on PVC pipes in water utilities focuses on diameters less than 24". Therefore, this thesis focuses on PVC water main pipelines with a diameter greater than 24" in an attempt to understand their performance in the water management facilities. This thesis had several objectives, such as to evaluate 24" and larger diameter PVC pipes in water transmission and distribution applications, calculate failure rate per hundred miles of PVC pipes at water utilities, categorize age of PVC pipelines with …

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Magnetic-Based Theranostic Nanoparticles For Prostate Cancer Management, Aniket Sharadrao Wadajkar Jan 2012

Magnetic-Based Theranostic Nanoparticles For Prostate Cancer Management, Aniket Sharadrao Wadajkar

Bioengineering Dissertations - Archive

With an increasing rate of cancers, the need for effective cancer management has led to the development of theranostic systems for diagnosis and therapy. Conventional techniques for cancer management have limited success due to inaccurate diagnosis and treatment side effects. Development of magnetic-based theranostic nanoparticles (MBTN) may overcome these limitations with the advantages of magnetic nanoparticles (MNPs) such as magnetic targeting, hyperthermia, and magnetic resonance imaging (MRI) contrast agents; and advantages of polymer coatings for carrying payloads and allowing bioconjugation for active targeting applications. Aim of this research was to develop multifunctional MBTNs for prostate cancer management. First, biodegradable photoluminescent …

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Long-Term Performance Of Gfrp Reinforced Concrete Beams And Bars Subjected To Aggressive Environments, Yeonho Park Jan 2012

Long-Term Performance Of Gfrp Reinforced Concrete Beams And Bars Subjected To Aggressive Environments, Yeonho Park

Civil Engineering Dissertations - Archive

The use of fiber-reinforced polymer (FRP) bars in reinforced concrete (RC) structures has emerged as an alternative to traditional steel reinforcement environments and other applications where steel has shown greater vulnerability. Although the number of analytical and experimental studies on RC beams with FRP reinforcement has increased in recent decades, its long term performance is still questioned in comparison to the traditional steel reinforcement. That is, long-term performance is a much recognized but less-mentioned topic in the field of the reinforced concrete with glass-FRP (GFRP) re-bars. There is a need to validate long-term performance of FRP reinforced concrete structures, and …

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A Novel Minimally Invasive Dual-Modality Fiber Optic Probe For Prostate Cancer Detection, Vikrant Sharma Jan 2012

A Novel Minimally Invasive Dual-Modality Fiber Optic Probe For Prostate Cancer Detection, Vikrant Sharma

Bioengineering Dissertations - Archive

Prostate cancer is the most common form of cancer in males, and is the second leading cause of cancer related deaths in United States. In prostate cancer diagnostics and theapy, there is a critical need for a minimally invasive tool for in vivo evaluation of prostate tissue. Such a tool finds its niche in improving TRUS (trans-rectal ultrasound) guided biopsy procedure, surgical margin assessment during radical prostatectomy, and active surveillance of patients with a certain risk levels. This work is focused on development of a fiber-based dual-modality optical device (dMOD), to differentiate prostate cancer from benign tissue, in vivo. dMOD …

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Methodology Of Citric Acid Based Functional Biomaterial Development And Application, Yi Leaf Zhang Jan 2012

Methodology Of Citric Acid Based Functional Biomaterial Development And Application, Yi Leaf Zhang

Bioengineering Dissertations - Archive

Biomaterials play critical roles in modern strategies of biomedical applications, such as tissue engineering, and theranostic therapy. Attempts to design ideal biomaterials for each specific application have led to an enormous increase in the number of polymeric biomaterials. Different biomedical applications require specific functionality of biomaterials. Unfortunately, the limited versatility of currently available biodegradable polymers fails to meet the wide range of requirement for biomedical applications. Therefore, a methodology of functional biomaterials development would be beneficial to the biomaterial field. It has been proved that citric acid can be utilized as a key element in the development of novel biodegradable …

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Phase Sensitive Spectral Domain Interferometry For Label Free Biomolecular Interaction Analysis And Biosensing Applications, Sajal Chirvi Jan 2012

Phase Sensitive Spectral Domain Interferometry For Label Free Biomolecular Interaction Analysis And Biosensing Applications, Sajal Chirvi

Bioengineering Dissertations - Archive

Biomolecular interaction analysis (BIA) plays vital role in wide variety of fields, which include biomedical research, pharmaceutical industry, medical diagnostics, and biotechnology industry. Study and quantification of interactions between natural biomolecules (proteins, enzymes, DNA) and artificially synthesized molecules (drugs) is routinely done using various labeled and label-free BIA techniques. Labeled BIA (Chemiluminescence, Fluorescence, Radioactive) techniques suffer from steric hindrance of labels on interaction site, difficulty of attaching labels to molecules, higher cost and time of assay development. Label free techniques with real time detection capabilities have demonstrated advantages over traditional labeled techniques. The gold standard for label free BIA is …

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Dynamic Bus Lane, Isaac F. Joskowicz Jan 2012

Dynamic Bus Lane, Isaac F. Joskowicz

Civil Engineering Dissertations - Archive

This dissertation documents the research conducted to investigate the feasibility of implementing a "Dynamic Bus Lane" (DBL) system on Westheimer Road in Houston, Texas, and to determine the particular conditions when the system could be applied to other arterial streets. The DBL system is a bus preferential system which would turn a normal traffic lane into a bus lane when a bus is approaching a bus stop at a major intersection. The bus would activate a dynamic message sign that would change the lane use from a normal traffic lane to a bus lane for the time when the bus …

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Qualitative Evaluation Of Transportation Construction Related Social Costs And Their Impacts On The Local Community, Amanda Ferguson Jan 2012

Qualitative Evaluation Of Transportation Construction Related Social Costs And Their Impacts On The Local Community, Amanda Ferguson

Civil Engineering Theses - Archive

Although construction is valuable after completion, it can cause many disturbances throughout the duration of the project. These negative impacts, such as economic losses and annoyances, which face the community surrounding a construction project, are referred to as social costs. They are the inconveniences that confront the general public and take many forms such as traffic delays and congestion, decreased revenue, increased accidents, and air and noise pollution. Social costs negatively affect the surrounding environment and everyday quality of life. Social costs are often not incorporated into construction design, planning or budgets. This can be attributed to the complexity of …

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Development Of A Flexible Pavement Design Procedure Based On The Mechanistic - Empirical Pavement Design Guide: A Case Study, Ali Qays Abdullah Jan 2012

Development Of A Flexible Pavement Design Procedure Based On The Mechanistic - Empirical Pavement Design Guide: A Case Study, Ali Qays Abdullah

Civil Engineering Dissertations - Archive

This research developed design tables of new flexible pavement structures for New York State Department of Transportation based on the Mechanistic Empirical Design Guide (MEPDG). The design tables were developed using the MEPDG software for Regions 1, 3, and 7 for Upstate part of New York State and for Regions 8, 10, and 11 for the Downstate part of New York State. The MEPDG software was used to run design cases for combinations of: climate conditions, traffic volume, subgrade soil stiffness (Mr) and pavement structures. The conditions that the MEPDG was used to run were: the road structures classified as …

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Application Of Scanning Correlation Spectroscopy Techniques To Quantify Dna Double Strand Break Repair Kinetics In The Living Cell After Exposure To Γ-Rays And Radiomimetic Chemicals, Salim Abdisalaam Jan 2012

Application Of Scanning Correlation Spectroscopy Techniques To Quantify Dna Double Strand Break Repair Kinetics In The Living Cell After Exposure To Γ-Rays And Radiomimetic Chemicals, Salim Abdisalaam

Bioengineering Dissertations - Archive

The kinetics of most proteins involved in DNA damage sensing, signaling and repair following ionizing radiation exposure cannot be quantified by current live cell fluorescence microscopy methods. This is because most of these proteins, with only few notable exceptions, do not attach in large numbers at DNA damage sites to form easily detectable foci in microscopy images. As a result a high fluorescence background from freely moving and immobile fluorescent proteins in the nucleus masks the aggregation of proteins at sparse DNA damage sites. Currently, the kinetics of these repair proteins are studied by laser-induced damage and Fluorescence Recovery After …

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Application Of Ellipse For Horizontal Alignment, Farzin Maniei Jan 2012

Application Of Ellipse For Horizontal Alignment, Farzin Maniei

Civil Engineering Theses - Archive

In highway design, horizontal alignments provide directional transition of roadways. Three categories of horizontal transition curves are simple circular curves, compound circular curves, and spiral circular curves. Compound and spiral curves, as alternatives to a simple circular curve, are often more costly since they are longer in length and require additional right-of-way. These costs differences are amplified at higher design speed. This study presents calculations associated with using a single elliptical arc in lieu of compound or spiral curves in situations where the use of simple circular curves is not prudent due to driver safety and comfort considerations. The study …

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Development Of Sers Nanoprobes For Multiplexed And Multi-Modality Molecular Diagnosis Of Cancer, James Otieno Nyagilo Jan 2012

Development Of Sers Nanoprobes For Multiplexed And Multi-Modality Molecular Diagnosis Of Cancer, James Otieno Nyagilo

Bioengineering Dissertations - Archive

Importance of cancer diagnosis and staging through molecular biomarker detection is evident in the increasing number of molecular biomarkers being discovered that are associated with specific cancers types with their role in disease severity and progression being elucidated. Development of molecular imaging modalities capable of simultaneously detecting multiple molecular biomarkers will have a major impact on research, detection, diagnosis, treatment and monitoring of cancer. Combining molecular imaging with high resolution structural imaging can potentially deliver a cancer diagnostic imaging platform with superior resolution and sensitivity. Nanotechnology, specifically in the form of functionalized metal nanoparticles exhibit unique chemical and electromagnetic properties …

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Micro-Device For Selective Isolation And Cytology Of Cancer Cells, Yuan Wan Jan 2012

Micro-Device For Selective Isolation And Cytology Of Cancer Cells, Yuan Wan

Bioengineering Dissertations - Archive

Early detection and isolation of circulating tumor cells (CTCs) can enable early cancer diagnosis and more effective therapeutics. Aptamers have emerged as probe molecules that have binding affinities comparable to antibodies but specificities better than those of antibodies. Epidermal Growth Factor Receptor (EGFR) is the most frequently overexpressed receptor in all human malignancies. The expression levels of EGFR in cancer cells can be over 100 times higher than those in normal cells. It is an attractive target for cancer therapy and cancer cell isolation.This dissertation focuses on two different areas: developing strategies for anti-EGFR aptamer based cancer cell isolation, and …

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Performance Comparison Of High Density Polyethylene Pipe, Chandan Venkatesh Jan 2012

Performance Comparison Of High Density Polyethylene Pipe, Chandan Venkatesh

Civil Engineering Theses - Archive

The current and forecasted major challenge faced by water utilities is delivering potable water efficiently with minimum loss to end users. Water pipe failure has negative impact not only local communities but also on the nation's economy. The American Water Works Association (AWWA) has estimated that it will cost over $250 billion to replace and renew the nation's water pipes over the next 20 years. According to the 2009 American Society of Civil Engineers (ASCE) Report Card, seven billion gallons of water are lost in this country every day!Every pipe has unique properties with advantages and limitations. During a pipe's …

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Effect Of Stress And Suction Histories Dynamic Properties Of Statically Compacted Silty Sand, William Allan Douglas Jan 2012

Effect Of Stress And Suction Histories Dynamic Properties Of Statically Compacted Silty Sand, William Allan Douglas

Civil Engineering Theses - Archive

This paper is devoted to the analysis of the experimental study whose intent is to find the effect of the stress/suction history on the dynamic properties of silty sand subjected to small- to mid-strains. The practical application of this study includes determining the effect on soil stiffness properties of increased soil suction (transpiration of water) followed by loading induced by shallow foundations and vice versa. Small-strain stiffness properties such as shear modulus, material damping, and shear wave velocity, are important subsoil parameters for proper analysis and design of unsaturated earth structures subject to static and dynamic loading. Traditional soil testing …

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An Evaluation Of Failure Modes For Cast Iron And Ductile Iron Water Pipes, Ameya Brahmanand Paradkar Jan 2012

An Evaluation Of Failure Modes For Cast Iron And Ductile Iron Water Pipes, Ameya Brahmanand Paradkar

Civil Engineering Theses - Archive

The need to evaluate the performance of cast iron and ductile iron water pipes is of great importance since they are the most common pipe materials for water mains. The concern in the water industry is about the cost involved in repairs and replacement of water pipes due to failure. The rate of pipe failures increases as the design life ends and become a financial burden on the water industry. This thesis evaluates the failure modes for the two most used pipe materials for water mains in the United States which are cast iron and ductile iron pipes. A study …

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Development Of Traffic Inputs For The Mechanistic-Empirical Pavement Design Guide In New York State, Ferdous Intaj Jan 2012

Development Of Traffic Inputs For The Mechanistic-Empirical Pavement Design Guide In New York State, Ferdous Intaj

Civil Engineering Theses - Archive

Proper characterization of traffic data is a prerequisite for the determination of appropriate traffic inputs to Mechanistic-Empirical Pavement Design Guide (MEPDG). The development of proper traffic inputs helps reflect the traffic conditions over the life of pavement which would decrease the maintenance, repair and traffic disruptions and improve the traffic conditions of a road network.The objective of the study was to characterize the traffic data and suggest the site-specific, regional or state wide average values for traffic inputs to MEPDG for New York State. Vehicle class distribution (VCD), monthly distribution factors (MDF), hourly distribution factors (HDF), average number of axle …

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Selective Catalytic Reduction Of Nitric Oxide Over Cerium-Doped Activated Carbons, Annaprabha Athappan Jan 2012

Selective Catalytic Reduction Of Nitric Oxide Over Cerium-Doped Activated Carbons, Annaprabha Athappan

Civil Engineering Dissertations - Archive

Selective catalytic reduction (SCR) with ammonia for diesel engine NOx reduction using activated carbon (AC) was studied. Comparisons of unmodified and cerium-doped Granular Activated Carbon (GAC), Activated Carbon Fiber (ACF), and Multiwall Carbon Nanotubes (MWCNTs) were conducted. Physical and chemical properties and durability of the catalysts were examined using Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS), carbon hydrogen and nitrogen (CHN) analysis, X-ray Diffraction (XRD) analysis, Raman spectroscopy, X-ray Photoelectron spectroscopy (XPS), Thermo gravimetric analysis (TGA), Braunauer-Emmett-Teller (BET) surface area analysis and density analysis. Experiments were carried in a fixed bed column at various temperatures from 100º to 400º …

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Characterization Of Sub-10 Nm Pores In Silicon-Dioxide, Joseph A. Billo Jan 2012

Characterization Of Sub-10 Nm Pores In Silicon-Dioxide, Joseph A. Billo

Electrical Engineering Theses - Archive

Biomarkers have become an integral part of oil exploration. Gas Chromatography (-Mass Spectrometry) is performed to an oil sample to acquire biomarkers from the sample. The presence, lack of, or abundance of a given compound (or biomarker) in the geochemical results of an oil sample depict(s) a property or properties of the source rock and the oil. For example, the abundance of pristane and lack of phytane in an oil sample are characteristic of a shale source rock, such as the Eagle Ford, will show a high pristane to phytane ratio. The Eagle Ford shale formation is cretaceous in age; …

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