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Articles 1231 - 1260 of 3180

Full-Text Articles in Engineering

Characterization Of Vertically Split Distribution-Wet Cooling Media Used In Data Centers, Mullaivendhan Varadharasan May 2017

Characterization Of Vertically Split Distribution-Wet Cooling Media Used In Data Centers, Mullaivendhan Varadharasan

Mechanical and Aerospace Engineering Theses - Archive

Data Centers houses substantial number of information technology (IT) equipment like computer servers and storage modules associated with various electronic components which consume high volume of electricity. The IT equipment in data center housing keeps dissipates heat energy as it is constantly running day and night. To keep the data center environment under thermally control and to favor the reliability of electronic components, we need to adopt a cooling technique which aids the module level cooling, with due consideration of the size of the data center and its geographical location. One of the adopted cooling technique in data center thermal …

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Composite Plate Optimization With Structural And Manufacturing Constraints, Deepak Polaki May 2017

Composite Plate Optimization With Structural And Manufacturing Constraints, Deepak Polaki

Mechanical and Aerospace Engineering Theses - Archive

This is a design optimization study that focuses on the value of free size optimization technology on composite structures which incorporates realistic structural requirements and practical manufacturing limitations to achieve an iterative design with effective structural performance. To detail a study on such practical implementation, a sample structure is required. A rectangular composite laminate with a central hole cutout is considered for this study and is designed using finite elemental tools which includes compression, tension and shear loading conditions with load reactions at bolted joints and buckling stability. Free size optimization and size optimization are used in this study to …

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Reliability Assessment Of Solder Joint Using Bga Package – Megtron 6 Versus Fr4 Printed Circuit Boards, Mugdha Anish Chaudhari May 2017

Reliability Assessment Of Solder Joint Using Bga Package – Megtron 6 Versus Fr4 Printed Circuit Boards, Mugdha Anish Chaudhari

Mechanical and Aerospace Engineering Theses - Archive

When it comes to the mechanical and electrical seam of the Printed Circuit Board (PCB) and package, reliability of the board plays a major impact on PCB. As the frequency increases, losses in signals increase. This necessitates the use of new materials for such applications. Nelco 4000-13EPSI, Rogers 4350B, Panasonic Megtron 6 are few high-speed materials used. Studies have shown that Megtron 6 has the least dielectric losses so far, low transmission loss, high heat resistance and has low weight loss than the FR-4 boards. With an increasing demand for high performance, reliability and lower costs, the field of electronic …

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Solder Joints Design Optimization Of Qfn Packages For Different Boards By Investigating Solder Joint Reliability, Rishikesh Vilas Tendulkar May 2017

Solder Joints Design Optimization Of Qfn Packages For Different Boards By Investigating Solder Joint Reliability, Rishikesh Vilas Tendulkar

Mechanical and Aerospace Engineering Theses - Archive

Quad Flat No-lead package (QFN) is one of the most cutting-edge technologies emerged in the market, exhibiting high performance and efficiency with unparalleled cost effectiveness. QFN, a leadless package, is an ideal choice for applications where size, weight thermal and electrical characteristics are critical, particularly in mobile and handheld devices. Applications like automotive, defense and high current circuits require the package to be mounted on thick printed circuit boards (PCB). The motivation of this work is to understand the effect of design variations of solder joints affecting reliability and optimize the solder package to improve reliability for application on different …

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An Improved Method For Measurement Of Radial Thermal Conductivity Of Cylindrical Bodies, Salwa Shaik May 2017

An Improved Method For Measurement Of Radial Thermal Conductivity Of Cylindrical Bodies, Salwa Shaik

Mechanical and Aerospace Engineering Theses - Archive

Li-ion cells are ubiquitously found in day to day electronic devices due to their high power density storage capacity. These batteries are known to exhibit sharp reduction in performance at high temperature. Due to this, several attempts have been made in the past to measure thermal properties of the Li-ion cell. This work improves upon past measurements by showing that heat loss during measurements is non-negligible, and by developing an analytical model to account for such heat loss. Experimental measurements carried out on multiple materials demonstrate non-negligible heat loss. When accounted analytically, these data result in thermal conductivity values that …

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Electro-Pneumatic Shifting And Servo Control Of A Clutch For A Fsae Racecar, Rahul Janardhan Chalmela May 2017

Electro-Pneumatic Shifting And Servo Control Of A Clutch For A Fsae Racecar, Rahul Janardhan Chalmela

Mechanical and Aerospace Engineering Theses - Archive

FSAE is an international student design competition held by SAE International where students design, build and compete in static events like cost, design and dynamic events ranging from acceleration, autocross to endurance. UTA Racing has been a part of FSAE since 1982 and have been using a mechanical design for their shifter and clutch since then. This year for the 2017 design competition an electro-pneumatic system is developed to replace the mechanical system. This system consists of pneumatic cylinders controlling a sequential shifter and a servo clutch. The cylinders are controlled using direction control valves, these receive their signals from …

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Rack Level Study Of Hybrid Cooled Servers Using Warm Water Cooling With Variable Pumping For Centralized Coolant System, Chinmay Sanjay Kshirsagar May 2017

Rack Level Study Of Hybrid Cooled Servers Using Warm Water Cooling With Variable Pumping For Centralized Coolant System, Chinmay Sanjay Kshirsagar

Mechanical and Aerospace Engineering Theses - Archive

As the worldwide demand for the data centers grows, so does the size and load placed on data centers which leads to the applied constraints on power and space available to the operator. Cooling power consumption is a major contributor of the total energy consumption of the system. In the process of optimization of cooling energy consumption per performance unit, liquid cooling technology has emerged as one of the most viable solutions. In this rack level study, 2OU (Open U) hybrid cooled web servers are tested for an evaluation of warm water cooling in centralized coolant system. Effects of higher …

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Load Carrying Capacity Management Of Compound Anisotropic Composite Rings Under External Pressure, Salman Bakhrayba May 2017

Load Carrying Capacity Management Of Compound Anisotropic Composite Rings Under External Pressure, Salman Bakhrayba

Mechanical and Aerospace Engineering Theses - Archive

Composites have much higher strength than conventional materials such as steel. This makes it attractive to replace heavy loaded structural elements, made traditionally from steel, by elements made from composites. However, it is not a trivial task for statically indeterminate structures due to anisotropy of elastic and strength properties of composites. Present investigation is done for a ring subjected to external load. Such rings are used as bulkheads in many applications. Dependence of ultimate external pressure on thickness of the ring is nonlinear one. It is related to non-uniformity of distribution of circumferential stresses, with anisotropy of material, with set …

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Comparative Study Of Viscoelastic Modeling And Linear Modeling For Wafer Level Chip Scale Package Under Drop Impact, Navya Sri Reddy Kasi Reddy May 2017

Comparative Study Of Viscoelastic Modeling And Linear Modeling For Wafer Level Chip Scale Package Under Drop Impact, Navya Sri Reddy Kasi Reddy

Mechanical and Aerospace Engineering Theses - Archive

Wafer level chip scale packages are one the preferred choice in the electronic industry to meet the need of new miniaturization of the recent devices. It has high efficiency in packaging and has low cost. On the other hand, the drop impact failure is one of the growing risk in day to day use of the portable devices. Therefore, to ensure product quality and to integrate more complicated functionality in these devices comprehensive reliability tests need to be performed before delivering the product. Accelerated thermal cycling, drop testing and power cycling are some accepted test methods used to access board …

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A Comparative Study Of Wooden And Composite Crossarm Of An Electric Utility Pole, Amith Venkatesh May 2017

A Comparative Study Of Wooden And Composite Crossarm Of An Electric Utility Pole, Amith Venkatesh

Mechanical and Aerospace Engineering Theses - Archive

Currently, most of the crossarms existing in the nation are made of wood. However, wood has a set of negative features like shorter life span due to environmental cracking, damages by insects and birds. Secondly, an insufficient strength and stiffness which is compensated either by increasing the cross-section or by reducing the span between two poles. Also, it’s reduced insulating property in case of high humidity of air which can be accounted to its hygroscopic behavior. Replacement of wooden crossarms by composite crossarms is a known solution to many problems. However, the existing projects are far from optimal. Present investigation …

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Thermal Characterization Of An Isolated Hybrid Cooled Server With Pump And Fan Failure Scenarios, Uschas Chowdhury May 2017

Thermal Characterization Of An Isolated Hybrid Cooled Server With Pump And Fan Failure Scenarios, Uschas Chowdhury

Mechanical and Aerospace Engineering Theses - Archive

Modern day data centers are operated at high power for increased power density, maintenance, and cooling which covers almost 2 percent (70 billion kilowatt-hours) of the total energy consumption in the US. IT components and cooling system occupy the major portion of this energy consumption. Although data centers are designed to perform efficiently, cooling the high-density components is still a challenge. So, alternative methods to improve the cooling efficiency has become the drive to reduce the cooling cost. As liquid cooling is more efficient for high specific heat capacity, density, and thermal conductivity, hybrid cooling can offer the advantage of …

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Comparison Of Mechanical Behaviour Of Metallic And Composite Front Door Of A Standard Automobile Car By Fea, Aniket Chandu Thosar May 2017

Comparison Of Mechanical Behaviour Of Metallic And Composite Front Door Of A Standard Automobile Car By Fea, Aniket Chandu Thosar

Mechanical and Aerospace Engineering Theses - Archive

With the advent of technology, materials have advanced many folds; one such technical revelation has been Fiber-reinforced Composite Materials. Composite materials have two major advantages, among many others: improved strength and stiffness, especially compared to other materials on a unit weight basis and low density with ease of manufacturing. These advantages have led to new aeronautical, automobile and marine designs that are radical departures from past efforts based on conventional materials. This paper focusses on a comparative study between Aluminum Alloys, Manganese alloys, structural steel, Composite materials and investigates the static and dynamic behaviors for a composite front door of …

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Experimental And Computational Investigation Of The Need For An Acclimation For Operating It Equipment, Ramesh Prasanna Manohar May 2017

Experimental And Computational Investigation Of The Need For An Acclimation For Operating It Equipment, Ramesh Prasanna Manohar

Mechanical and Aerospace Engineering Theses - Archive

Acclimation of IT equipment is not only for newly commissioned equipment but are also for the equipment that is already in use. In conventional Data Center, IT Equipment are cooled by traditional cooling methods, but due to increasing serious energy crisis, Data Centers are Free cooled because of the reduced power consumption. Free Cooling a Data Center is, when the outside air conditions are appropriate, they are drawn into the Data Center to cool the Operating IT Equipment. Data Centers uses dampers to control the type of cooling to be used. Due to a rapid change in the temperature and …

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Numerical Study Of Marangoni Convection And Mass Transport In Microdroplets, Viraj Parag Sabane May 2017

Numerical Study Of Marangoni Convection And Mass Transport In Microdroplets, Viraj Parag Sabane

Mechanical and Aerospace Engineering Theses - Archive

Marangoni convection is a flow resulting from a surface tension gradient at air/liquid interface caused by temperature gradient, concentration of surfactant or applied electric field. Marangoni convection when caused by temperature gradient is also known as thermo-capillary effect. A microgravity condition presents an ideal case to study this phenomenon, since interfacial forces are dominant over body forces. Hence Marangoni convection inside the micro-droplet was studied both numerically and experimentally. The potential application at micro-scale includes particle separation, chaotic mixing inside the droplet and possible enhancement in liquid liquid extraction. To explore these application, firstly flow field inside a droplet was …

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Design And Analysis Of A 10” Carbon Fiber Wheel For A Formula Sae Racecar, Pratik Ganesh G Bhagwat May 2017

Design And Analysis Of A 10” Carbon Fiber Wheel For A Formula Sae Racecar, Pratik Ganesh G Bhagwat

Mechanical and Aerospace Engineering Theses - Archive

Formula SAE is an engineering design competition for students where the goal is to design, build, and compete a Formula-style single seater race vehicle. With a legacy dating back to 1982, UTA Racing has been one of the most competitive teams. In this project, a carbon fiber 10” wheel is designed for the first time, achieving reduced unsprung weight and lower rotational inertia, both of which are key performance characteristics in vehicle dynamics. The design follows Tire and Rim Association guidelines to ensure dimensional compatibility and ease of assembly and is analyzed for 2G cornering with 3G bump. The simulations …

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Cfd Optimization Of The Cooling Of Yosemite Open Compute Server, Aditya Gupta May 2017

Cfd Optimization Of The Cooling Of Yosemite Open Compute Server, Aditya Gupta

Mechanical and Aerospace Engineering Theses - Archive

Rising energy demands in data centers have constantly made thermal engineers to think and come up with innovative cooling solutions in data centers. It is of utmost importance to have control over the environmental impact of Data Centers. In 2011, the Open Compute Project was started which aimed at sharing energy efficient practices for data centers. The hardware and electrical specifications of the first open compute server – Freedom was shared on open compute project’s website. It was a vanity free design and its components were custom designed. It was deployed in one of the data centers in Prineville, Oregon …

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Thermal Optimization And Validation Of Gan High Electron Mobility Transistor, Tanmay Pradip Kavade May 2017

Thermal Optimization And Validation Of Gan High Electron Mobility Transistor, Tanmay Pradip Kavade

Mechanical and Aerospace Engineering Theses - Archive

Gallium Nitride (GaN) is a binary III/V wide band gap semiconductor used in power electronics for operations at high power densities and high speeds. GaN has excellent characteristics like high break-down voltage, high thermal conductivity, and high electron saturation velocity which have led to an intensive study and wide use of GaN in many fields. Some of these fields range from amplifiers, MMIC, laser diodes, pulsed radars and counter-IED jammers to CAT-V modules and fourth generation infrastructure base-stations. Currently GaN devices suffer from high temperature due to self-heating which reduces the mean time to failure. In this study package level …

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Conjugate Heat Transfer And Thermo-Structural Analysis Of The Actively Cooled Multi-Stage Conical Nozzle And Hypersonic Low-Reynolds Diffuser Of The New Arc-Heated Wind Tunnel (Awht-Ii) Of The University Of Texas At Arlington, David Ray Campbell May 2017

Conjugate Heat Transfer And Thermo-Structural Analysis Of The Actively Cooled Multi-Stage Conical Nozzle And Hypersonic Low-Reynolds Diffuser Of The New Arc-Heated Wind Tunnel (Awht-Ii) Of The University Of Texas At Arlington, David Ray Campbell

Mechanical and Aerospace Engineering Theses - Archive

Arc-heated wind tunnels are the primary test facility for screening and qualification of candidate materials for hypersonic thermal protection systems (TPS). Via an electric arc that largely augments the enthalpy (by tens of MJ/kg) of the working fluid (Air, Nitrogen, CO2 in case of Mars-entry studies) passed through a converging-diverging nozzle at specific stagnation conditions, different regimes encountered in entry and re-entry hypersonic aerothermodynamics can be simulated. Because of the high-enthalpies (and associated temperatures that generally exceed the limits required by the thermo-structural integrity of the facility) the active cooling of the arc-heated wind tunnel’s parts exposed to the working …

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Structural Optimization & Reliability Of 3d Package By Studying Crack Behavior On Tsv & Beol & Impact Of Power Cycling On Reliability Flip Chip Package, Unique Rahangdale May 2017

Structural Optimization & Reliability Of 3d Package By Studying Crack Behavior On Tsv & Beol & Impact Of Power Cycling On Reliability Flip Chip Package, Unique Rahangdale

Mechanical and Aerospace Engineering Theses - Archive

The 3D packaging is stacked of chips on top of another which is emerging as a powerful technology that satisfies such integrated circuit (IC) package demands. Most of the stress develops at interfaces and the interface delamination of TSV may encounter which is mainly driven by a shear stress concentration at the point. In this study, the effect of package structure on the failure metric of the 3D package has been studied. J-integral has been used to quantify the crack driving force. The crack is modeled at the TSV and BEOL (Back End of the Line) and the die -substrate …

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Design Optimization Of Race Car Steering Knuckle For Additive Manufacturing, Yobani Martinez May 2017

Design Optimization Of Race Car Steering Knuckle For Additive Manufacturing, Yobani Martinez

Mechanical and Aerospace Engineering Theses - Archive

Additive manufacturing enables increased geometric complexity in structural configuration compared with conventional manufacturing methods. A Physics-first Computer Aided engineering (CAE) process beginning with structural topology optimization enables engineers to take advantage of this increased geometric design freedom. This work develops and demonstrates the steps and tools necessary to realize complex design configuration for additive manufactured. This report looks at the race car steering knuckle using the UTA FSAE upright as a case study. The stiffness driven upright component design is executed using topology optimization and NURBS based surface modeling tools. The topology optimization model is developed for 3 different load …

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Thermal Management Of High Power Multi Chip Module By Design Optimization Of Segregated Serpentine Flow Cold Plate, Krishna Chaitanya Siripurapu May 2017

Thermal Management Of High Power Multi Chip Module By Design Optimization Of Segregated Serpentine Flow Cold Plate, Krishna Chaitanya Siripurapu

Mechanical and Aerospace Engineering Theses - Archive

Data center environment cooling requirements became a challenge with rapid increasing microprocessor power densities which leads to non-uniform distribution of temperature. A practical cooling solution which relies on the segregated flow of cooling resources based on power density for thermal management of high power equipment is introduced. This minimizes energy consumption of cooling infrastructure. Performance of existing cold plate is previewed and amount of savings possible is shown from numerical analysis of segregated model. Model is designed by considering manufacturing feasibility to make samples for proposed solution for future experimental study. A multi-chip module is chosen as a base for …

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Ag Nano-Dendritic Three-Dimensional (3d) Surface-Enhanced Raman Scattering (Sers) Substrate For In-Situ Liquid Media Detection, Milind Mansing Pawar May 2017

Ag Nano-Dendritic Three-Dimensional (3d) Surface-Enhanced Raman Scattering (Sers) Substrate For In-Situ Liquid Media Detection, Milind Mansing Pawar

Material Science and Engineering Theses - Archive

Continuous monitoring of certain environmental pollutants, biological species, chemical species, and explosives are of utmost importance in recent times. Surface-enhanced Raman scattering (SERS) provides most promising option as it is a highly sensitive technique which allows for ultrasensitive detection of molecules and provides excellent structural information. To obtain rich results through Surface-enhanced Raman scattering, proper design of enhancing substrate plays vital role. Contemporary SERS substrates don’t provide ease to detect liquid analytes for in-situ spectroscopy. Liquid media detection through SERS relies on highly statistical binding of analytes to SERS-sensitive hot spots. Moreover, it becomes extremely difficult to detect flowing liquid …

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A Liver-Kidney Biosubsystem, Brian J. Budnik May 2017

A Liver-Kidney Biosubsystem, Brian J. Budnik

Bioengineering Dissertations - Archive

Each year many patients die waiting for a transplant organ to become available. Increasing the available number of transplant organs would save lives. The donor pool could be expanded if organs which are considered to be of uncertain viability could be utilized for transplantation. Currently, when there is any doubt about the viability of the organ, it is discarded. This occurs because there has been no way to confirm its viability other than to transplant it and risk the life of the recipient. Thus, many organs that are in fact good are wasted. Some might not be fully viable but …

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Response Of Unsaturated Soils Under Monotonic And Dynamic Loading Over Moderate Suction States, Aritra Banerjee May 2017

Response Of Unsaturated Soils Under Monotonic And Dynamic Loading Over Moderate Suction States, Aritra Banerjee

Civil Engineering Dissertations - Archive

The understanding of the mechanical behavior of the unsaturated soils has been significantly enhanced due to the recent advancement of technology and modifications to the conventional testing devices. However, the implementation of the concepts of unsaturated soil has lagged, mainly due to the risks associated with the development of civil infrastructure based on practically untested theories and the limited reliable prediction methods for compacted, expansive, residual, and collapsible soils, which requires reliable and comprehensive experimental data. Moreover, the tests on unsaturated soils are enormously time consuming and often exorbitantly expensive, which further hinders the use of unsaturated soil mechanics in …

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Development Of Cancer Trap For Capturing Cancer Cells That Metastasize In The Peritoneal Cavity: A Preliminary Study, Chuka I. Okpokwasili May 2017

Development Of Cancer Trap For Capturing Cancer Cells That Metastasize In The Peritoneal Cavity: A Preliminary Study, Chuka I. Okpokwasili

Bioengineering Theses - Archive

Our laboratory has recently developed an implantable device - cancer trap that can recruit and trap circulating cancer cells inside the bloodstream. Since several types of cancer cells can metastasize inside the peritoneal cavity, this study explores the possibility of using cancer traps to recruit esophageal and prostate cancer cells inside the peritoneum. Using prostate cancer and esophageal cancer cells as model cancers, this thesis shows that cancer traps can capture cancer cells inside the peritoneal space. EPO releasing traps was also shown to reduce the spread of prostate cancer as well as esophageal cancer compared to controls. Using multiple …

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Performance Of Cement Treated Recycled Aggregates Under Wetting-Drying Cycles In Pavement Base, Saif Bin Salah May 2017

Performance Of Cement Treated Recycled Aggregates Under Wetting-Drying Cycles In Pavement Base, Saif Bin Salah

Civil Engineering Theses - Archive

Resilient Modulus (MR) is one of the most important stiffness parameter to determine the thickness of a pavement layer (AASHTO 2003 pavement design guideline). Recent studies conducted by researchers on the variability of MR with wetting-drying (WD) and freeze-thaw (FT) cycles show that long-term durability is an important criterion to be considered in designing pavement base with recycled materials. At present, the design procedure does not consider the effect of deterioration of pavement layers due to seasonal variations and limited studies have been conducted to evaluate the effect of environmental deterioration on the reclaimed asphalt pavement (RAP) and recycled crushed …

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Effect Of Manure And Enzyme On The Degradation Of Organic Fraction Of Municipal Solid Waste In Biocell, Anuja Sapkota May 2017

Effect Of Manure And Enzyme On The Degradation Of Organic Fraction Of Municipal Solid Waste In Biocell, Anuja Sapkota

Civil Engineering Theses - Archive

More than half of total Municipal Solid Waste (MSW) generated is composed of organic degradable waste for developed countries and the percentage is even higher for developing countries. Handling of organic fraction of MSW has always been challenging due to environmental and economic reasons. Among all the MSW management alternatives, Sustainable Biocell concept has potential to solve environmental and economic concerns related to organic waste. This potential of Sustainable Biocell can be enhanced by accelerated decomposition of waste. Accelerated decomposition of organic fraction of MSW can be achieved by the addition of nitrogen rich, macro and micro nutrients such as …

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The Study Of Screws Under Bending For Curtain Wall Head And Sill Anchors, Humberto Madero Mcentee May 2017

The Study Of Screws Under Bending For Curtain Wall Head And Sill Anchors, Humberto Madero Mcentee

Civil Engineering Theses - Archive

The study of screws under bending is a very important topic for the solution of anchors (connections) of the vertical members of a Curtain Wall or Storefront that connects top and bottom thru Head and Sill anchors. When there are shims that create a gap between the connected anchor and the structure that connects to, the screws connecting the anchor to the structure would be under bending; very few or any tests are available showing the capacity of a screw under bending; this thesis would present tests and theory of screws under bending, and discussion/clarification of the behavior of these …

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Applications Of Ultra-High Performance Fiber-Reinforced Concrete On Flexural Structural And Architectural Members, Venkatesh Babu Kaka May 2017

Applications Of Ultra-High Performance Fiber-Reinforced Concrete On Flexural Structural And Architectural Members, Venkatesh Babu Kaka

Civil Engineering Theses - Archive

This thesis presents the test results of a study on flexural and shear behavior of Ultra-High-Performance Fiber-Reinforced concrete (UHP-FRC) beams, reinforced with Grade 60 steel (ASTM A615/A615M), Grade 100 steel (ASTM A1035/A1035M) and Basalt fiber reinforced polymer (BFRP) bars. Ultra-high-performance fiber-reinforced concrete (UHP-FRC) has high compressive strength (> 22 ksi (150 MPa)) and exceptional compressive ductility. The use of UHP-FRC provides new opportunities for future infrastructure. However, structural design criteria have not been developed to fully utilize UHP-FRC’s excellent mechanical properties. Maximum useable compressive strain, ecu, specified in the current design codes (ACI 318 Building Code and AASHTO LRFD Bridge …

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A Comparison Of Smart City Indicators For Three Top Ten Us Cities, Rasoul Adnan Abbas May 2017

A Comparison Of Smart City Indicators For Three Top Ten Us Cities, Rasoul Adnan Abbas

Civil Engineering Theses - Archive

The world population has been increasing each year, and the immigration from rural to urban cities has increased as well. The United Nations has estimated that more than 66% of people worldwide live in urban area, and this urbanization trend will continue to increase, thereby generating challenges to the cities as they strive to provide health care, schools, and transportation. The urban population explosion has also caused problems to the environment and overall urban economy as the need for more housing, jobs, and community services require smart solutions. The term, smart city, has many definitions, but all of them agree …

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