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Articles 77071 - 77100 of 195898
Full-Text Articles in Engineering
Characterization Of Normal And Abnormal Bones By Raman Spectroscopy : Analysis Of Mineral To Matrix Ratio Of Bone Using Advanced Materials Characterization Techniques, Meet Yagnesh Shah
Characterization Of Normal And Abnormal Bones By Raman Spectroscopy : Analysis Of Mineral To Matrix Ratio Of Bone Using Advanced Materials Characterization Techniques, Meet Yagnesh Shah
Material Science and Engineering Theses - Archive
Bone disorders and disease are associated with multiple factors. Some of the disorders and diseases are difficult to understand because of their unknown root causes. Our goal was to differentiate between normal and genetically modified rat bone groups by finding the difference in mineral to matrix (Mn/Mx) content using Raman spectroscopy. Raman spectroscopy gives the chemical composition based on the vibration modes of the molecules. Quantitative analysis of Mn/Mx content calculated from Raman spectra allowed us to distinguish between healthy and genetically modified rat bone groups. We have presented the results by averaging the Mn/Mx ratios. Thus, the most significant …
Quantitative Analysis Of Mineral/Matrix To Evaluate Genetically Altered Bone With Infrared Spectroscopy And X-Ray Spectral Imaging, Sunil Balasaheb Yadav
Quantitative Analysis Of Mineral/Matrix To Evaluate Genetically Altered Bone With Infrared Spectroscopy And X-Ray Spectral Imaging, Sunil Balasaheb Yadav
Material Science and Engineering Theses - Archive
This thesis focuses on the characterization of bone with the help of Fourier Transform Infrared Spectroscopy and Energy Dispersive Spectroscopy. Such analysis of the physics and chemistry of biomaterials is vital to resolve problems in life science of bone-related diseases and disorders. Material characterization can help in the understanding of disease mechanisms and lead to useful drugs and other treatments. In this thesis, I have used bone materials produced by groundbreaking research at UT Southwestern Research Center and Texas Scottish Rite Children's Hospital to establish that idiopathic clubfoot (Talipes equinovarus) is associated with the Follistatin 5 gene. We studied healthy …
Experimental Investigation Of Fischer-Tropsch Synthesis With A Modified Catalyst Support, Pawarat Bootpakdeetam
Experimental Investigation Of Fischer-Tropsch Synthesis With A Modified Catalyst Support, Pawarat Bootpakdeetam
Mechanical and Aerospace Engineering Dissertations - Archive
Energy demand has been rapidly increasing in the last 30 years due to the population growth and high demand by industries. However, as natural energy sources are limited, they cannot meet this increased energy demand. Therefore, alternative energies have become an option to sustain current and future energy demands. One promising and reliable alternative energy is the Fischer-Tropsch synthesis (FTS), which is a gas-to-liquid (GTL) technology that converts syngas from a low-value feedstock, for example, from coal, biomass, or natural gas, into a high-value liquid hydrocarbon. In addition, FTS is a highly exothermic catalytic reaction that requires careful thermal management …
Reconfigurable Electrochemical Biosensor Enabled By Digital Microfluidic Devices, Ali Farzbod
Reconfigurable Electrochemical Biosensor Enabled By Digital Microfluidic Devices, Ali Farzbod
Mechanical and Aerospace Engineering Dissertations - Archive
The increasing demand for improving the health care quality in developed countries with synchronous advances in the microfabrication of CMOS devices results in the emergence of the Lab-on-a-chip (LOC) field. The ultimate goal of LOC's is to achieve the complete integration of biomedical protocols, such as sample pre-processing and separation and analysis of biosamples on a chip. Electrowetting on dielectric (EWOD) as a distinctive digital microfluidic (DMF) is capable of manipulating droplets less than a microliter along the electrode arrays by applying AC voltages. EWOD chips, as microfluidic platforms, are inherently electrical and do not have to deal with problems …
A Two Stage Event Based Data Driven Controller For Improved Grasping Of An Artificial Hand, Christopher Abrego
A Two Stage Event Based Data Driven Controller For Improved Grasping Of An Artificial Hand, Christopher Abrego
Mechanical and Aerospace Engineering Dissertations - Archive
The human hand is one of the greatest (if not the greatest) tool known to mankind for grasping objects. So much so, that researchers have been investigating the development of artificial biomimetic hands in an effort to mimic their functionality and dexterity with the indent to apply the technology to various robotic platforms; ranging from end effectors for industrial pick-and-place robotics, to upper-limb prosthetics, to humanoids. There are certain features that make this endeavor challenging such as the mechanical design, actuation and sensorization, and functionality as well as the interaction from both the view point of interacting with an end …
Finite Element Analysis Of Composite Water Buffer Drum, Chinmay Shrikrishna S Godbole
Finite Element Analysis Of Composite Water Buffer Drum, Chinmay Shrikrishna S Godbole
Mechanical and Aerospace Engineering Theses - Archive
Composite materials offer many advantages for to many industries and developments based on their low density, corrosion resistance, and high strength to weight ratio. In addition, the use of composites allows for more design flexibility for products, the properties to meet specific design requirements, thus promoting better system oriented and cost-effective solutions. However, on a high performance equated basis, the economic incentive to use composite components can often be demonstrated based on their capability to reduce system and life cycle costs. Water buffer drum which is a pressure vessel holds a specified volume of fluid with desired temperature and pressure. …
On The Development And Integration Of Pneumatic Extrusion Module And A Methodology To Identify Process Parameters For Additive Manufacturing Using Machine Learning, Kashish Dhal
Mechanical and Aerospace Engineering Theses - Archive
Commonly used additive manufacturing platforms have a single extrusion module based on Fused Filament Fabrication (FFF) and their processing software generates G-Codes for this FFF module using defined process parameters. These platforms and software do not accommodate different processing modules such as viscous extruders or Direct Ink Writing (DIW). This research is focused on the development of a Pneumatic Extrusion Module (PEM) capable of dispensing viscous materials such as gels or slurries controlled through a digital pneumatic valve. A PEM is developed, integrated and its performance is evaluated on a multi-modality additive manufacturing platform in the MARS Lab. The operation …
Experimental Analysis Of A Single-Phase Direct Liquid Cooled Server Performance At Extremely Low Temperatures For Extended Time Periods, Gautam Gupta
Mechanical and Aerospace Engineering Theses - Archive
A data center is a centralized facility that we use for housing the computer systems and its related components such as high-end servers, redundant data connection and security controls. The next radical change in the thermal management of data centers is to shift from conventional cooling methods like air-cooling to direct liquid cooling (DLC) to deal with high thermal mass. The past few years have consistently seen wider adoption of direct liquid cooling because of its simplicity and high heat dissipation capacity. Passive single phase engineered fluid immersion cooling has several other benefits like better server performance, even temperature profile …
Quasi-One-Dimensional Scramjet Combustor Flow Solver Using The Numerical Propulsion System Simulation, Long Vu
Mechanical and Aerospace Engineering Theses - Archive
The flow field inside a scramjet engine combustor involves complex phenomena such as fuel-air mixing, combustion chemistry, and flow separation. In order to determine the properties of the flow along the length of the combustor, mass, momentum and energy balance equations are solved simultaneously using a numerical method. While a full three dimensional computational simulation gives detailed results with high order of accuracy, it demands a great amount of time and computational resource. A low order analysis produces a fast overall picture of the combustor operation which in turn provides valuable information suitable for the preliminary design process. This research …
Robot Motion Tracking Using Time-Of-Flight And Structured Light Sensors For Indoor Navigation, Karan Vishnu Rao
Robot Motion Tracking Using Time-Of-Flight And Structured Light Sensors For Indoor Navigation, Karan Vishnu Rao
Mechanical and Aerospace Engineering Theses - Archive
Simultaneous localization and mapping for mobile robots has been an active research field for several years with focus on the problems of accuracy and dependability of the data from the robot's peripherals. The position estimates for mobile and industrial robots is usually achieved by using the information from the global positioning system in an outdoor environment and for indoor environment, technologies such as LiDAR sensors and Infrared (IR) camera based motion capture systems such as VICON (TM) are used. The main issue with these approach for indoor navigation is the monetary cost to associated with these technologies. The purpose of …
Comparison Of Carbon Steel And Composite Side Wall Of Light Rail Vehicle By Finite Element Analysis, Dilraj Singh
Comparison Of Carbon Steel And Composite Side Wall Of Light Rail Vehicle By Finite Element Analysis, Dilraj Singh
Mechanical and Aerospace Engineering Theses - Archive
A Railroad car is a vehicle used for carrying passengers and cargo. In the modern era, rail vehicles are designed as lightweight structures with the aim to minimize mass, operational energy demands, and CO2 emissions. Light rail vehicle is used at street level where they have direct contact with normal traffic and have a short distance between stations. In order to reduce dwell time at stops, and so, the vehicle can accelerate and deaccelerate easily, weight should be less and that is why low floor design is adopted these days. The sidewall is a crucial part of the car body …
Airflow Path And Flow Pattern Analysis Of Sub-Micron Particulate Contaminants In A Data Center With Hot Aisle Containment System Utilizing Direct Air Cooling, Satyam Saini
Mechanical and Aerospace Engineering Theses - Archive
The percentage of the energy used by data centers for cooling their equipment has been on the rise. With it has been the necessity for exploring new and more efficient methods, both from an engineering as well as business point of view, to contain this energy demand. The PCB boards are becoming more densely populated with multitude of smaller hardware on them, thereby, increasing its cooling requirements. Literature suggests that almost 40% of the total energy consumption in a typical Data Center is used for cooling purposes. Air cooling has always been the first choice for IT companies to cool …
Experimental Characterization Of Vertically Split Distribution Wet- Cooling Media Used In Direct Evaporative Cooling Of Data Center, Ahmed Al Khazraji
Experimental Characterization Of Vertically Split Distribution Wet- Cooling Media Used In Direct Evaporative Cooling Of Data Center, Ahmed Al Khazraji
Mechanical and Aerospace Engineering Theses - Archive
When operating in direct evaporative cooling (DEC) mode, the amount of moisture added to a system can be controlled by frequently modulating water supply to the wet cooling media. Though many challenges arise due to geographical and site conditions, this concept can be applied to data centers to serve as a cost-effective alternative for maintaining the operating temperature of the facility at any weather condition. However, this method results in scale and mineral build up on the media because of an irregular water distribution. To prevent the scale formation, the operators allow the water supply continuously on the cooling media …
Investigation On Effective Modulus And Stress Concentration Factor Of 3d Reinforced Composite By Finite Element Analysis Method, Chandra Bhaskar Reddy Pittu
Investigation On Effective Modulus And Stress Concentration Factor Of 3d Reinforced Composite By Finite Element Analysis Method, Chandra Bhaskar Reddy Pittu
Mechanical and Aerospace Engineering Theses - Archive
Micromechanics of Composites aims to analyze the localized stresses inside any given constituents of the composite structure. This Thesis is focused on Calculating the effective modulus and the Stress concentration factor of the 3D straight Fiber Composite using Finite Element(FE). The compressive and a Shear response of a 3D Straight fiber composite comprising three directional E Glass Fibers reinforced in an epoxy matrix is analysed. This result is the 10% of overall Composite Ductility and a 10% of overall Shear displacement load in the orthogonal directions. FE calculations are reported to analyse the response of 3d reinforcement as of with …
Optimization Of Heating, Ventilation, And Air-Conditioning (Hvac) Chilled Water Plant Systems, Cliff Odhiambo Nudi
Optimization Of Heating, Ventilation, And Air-Conditioning (Hvac) Chilled Water Plant Systems, Cliff Odhiambo Nudi
Mechanical and Aerospace Engineering Theses - Archive
Heating, Ventilation, and Air-conditioning accounts for about 60% of the total energy consumed in commercial facilities including office buildings, hospitals, retail stores, warehouses, campuses, manufacturing facilities, medical facilities, etc. As the cost of electricity and energy continue to rise, building owners and facility managers continue to witness a rise in the Total Cost of Ownership. Chilled water plant system is the largest consumer of energy in HVAC system consuming 75% of the total energy used in HVAC according to the Department of Energy. Operating chilled water plant systems at the recommended AHRI Standard 550/590 for performance rating of water chilling …
Design And Experimental Study Of Hydrostatic Thrust Air Foil Bearing, Myong Sok Song
Design And Experimental Study Of Hydrostatic Thrust Air Foil Bearing, Myong Sok Song
Mechanical and Aerospace Engineering Theses - Archive
Oil-free bearing technology has several advantages over conventional oil-lubricated bearings. These advantages include high-speed operation, reduced weight, and increased reliability. Consequently, oil-free technology is expected to replace conventional bearings in a variety of applications. However, many challenges need to be addressed for widespread adoption of oil-free technology such as lower load capacity during start/stop and issues with controlling temperature. Thrust bearings, unlike their radial counterparts, are used for supporting axial loads and have become more important in recent years because of layout requirements other than double overhang configuration gaining consideration for specialized applications. Moreover, the requirements are demanding more extreme …
Simulation, Control And Testing Of A Custom 5-Dof Robotic Manipulator System, Roopak M. Karulkar
Simulation, Control And Testing Of A Custom 5-Dof Robotic Manipulator System, Roopak M. Karulkar
Mechanical and Aerospace Engineering Theses - Archive
Open chain manipulators are a well posed problem, however it was necessary to build a system customized to meet the needs of the Unmanned Ground Vehicle developed in the Aerospace Systems Laboratory. Considering that there are multiple such small ground vehicles, the main design constraint on the system was to be modular and lightwieght to enable quick swapping from both, a hardware and a software point of view. The purpose of this thesis is design, simulation and control a modular 5-Degree-of-Freedom manipulator with versatility in end effector configuration. This was achieved through the Robot Operating System which brings a high …
Experimental Investigation Of Thermophysical Properties Of Enhanced Nitrate Salt Nanofluids For Thermal Energy Storage (Tes) In Concentrated Solar Power (Csp) Systems, Vamsi Kiran Eruvaram
Experimental Investigation Of Thermophysical Properties Of Enhanced Nitrate Salt Nanofluids For Thermal Energy Storage (Tes) In Concentrated Solar Power (Csp) Systems, Vamsi Kiran Eruvaram
Mechanical and Aerospace Engineering Theses - Archive
The main source for energy production right now is from thermal, nuclear energy. But in the near future we might have crisis of coal so we need alternate renewable source for energy production the solution for that is sun, since solar energy is renewable and abundantly available. Concentrated solar power (CSP) technologies is one of the best solution to overcome this energy crisis, because it works from solar energy. If the CSP is incorporated with thermal energy storage (TES) we can produce energy even during night. TES with 15-hour storage capacity (Gemasolar) is already commercialized to operate a CSP plant …
Additive Manufacturing Process Investigation For The Fabrication Of Composite Scaffolds For Soft Tissue Application, Parimal Patel
Additive Manufacturing Process Investigation For The Fabrication Of Composite Scaffolds For Soft Tissue Application, Parimal Patel
Mechanical and Aerospace Engineering Theses - Archive
Additive manufacturing has been investigated and employed in the bio-medical domain for the fabrication of various devices and scaffolds. In various soft tissue engineering applications, multi-functional multi-material scaffolds are required for cell proliferation, structural integrity, bio-compatibility and tissue regeneration. In this research, an additive manufacturing methodology is developed to allow the fabrication of bio-composite scaffolds using a multi-modality in-house built platform. The researched materials for printing are Poly-L-Lactic Acid (PLLA) and a newly developed photo-curable radiopaque polymer called Rylar (Poly glycerole sebacate fumarate gadodiamide) mixed with a cross-linking agent Poly (Ethylene glycol) diacrylate (PEGDA). The developed methodology uses a Fused …
Reliability Of A 2.5d Tsv Package, Neha Vinayak Gaikwad
Reliability Of A 2.5d Tsv Package, Neha Vinayak Gaikwad
Mechanical and Aerospace Engineering Theses - Archive
In the recent years, the Through Silicon Vias (TSVs) are helping a huge variety of the 3D IC and the 2.5D IC packaging applications to try to fulfill their requirements of functionality and higher connectivity at the expense of lower power consumption and minimum heat dissipation. The TSVs offer great interconnect density, high device density, short connection paths, great space efficiency and high interconnect bandwidth. The basic difference between a 3D TSV package and a 2.5D TSV package is that the 2.5D one interconnects the dies side by side on a silicon interposer, over its entire length. The interposer, placed …
Mass Fabrication & Evolution Of Beads On Fiber, Kirthika Suresh
Mass Fabrication & Evolution Of Beads On Fiber, Kirthika Suresh
Mechanical and Aerospace Engineering Theses - Archive
In this work, we systematically explore the relation between the coating speeds and the finally formed liquid beads on fiber. The main focus of the paper lies with contact angle, length and height of beads on fiber and the fiber drawing velocity. For this purpose, free energy variation method is applied, based upon which the boundary conditions for the beads-on-fiber system and governing equations were re-derived. A combination of both, first and the second kind of the Legendre’s elliptical functions are used to determine the geometrical shape of the beads. Contact angle is extracted from the experimental data by using …
Predicting Mechanical Behavior Of 3d Printed Structures Using Mechanics Of Composites And Fracture, Megha Tangri
Predicting Mechanical Behavior Of 3d Printed Structures Using Mechanics Of Composites And Fracture, Megha Tangri
Mechanical and Aerospace Engineering Theses - Archive
Recently, additive manufacturing, or 3D printing as it is more commonly called, has taken a big leap in the manufacturing industry. This technology is rapidly moving from prototyping to manufacturing using metals, polymers, concrete and even composites. Unlike subtractive methods of manufacturing, additive manufacturing can be used to manufacture parts with highly directional mechanical properties. This research focuses on predicting tensile failure of 3D printed polymer structures in different raster orientations using composites lamination theory. Previously it was found experimentally that tensile strengths of 3D printed specimens decrease when raster orientations changes from 0° to 90°. The proposed model developed …
Numerical Simulation Of Unsteady Normal Detonation Combustion, Ajjay Omprakas
Numerical Simulation Of Unsteady Normal Detonation Combustion, Ajjay Omprakas
Mechanical and Aerospace Engineering Theses - Archive
The objective of this research is to simulate normal detonation combustion which is a mode of operation for a Pulsed Detonation Engine (PDE). A supersonic flow with stoichiometric hydrogen-air mixture is made to impinge on a wedge, thus resulting in increasing the temperature and pressure across a shock wave leading to the formation of detonation wave. Different modes of the operations can be simulated by varying the incoming Mach number, pressure, temperature and equivalence ratio. For the case of normal detonation wave mode which is an unsteady process, after the detonation being initiated due to the shock induced by the …
Experimental And Analytical Study Of A Self-Regulated Flow Control Device Developed For Dynamic Cold-Plates To Cool High-Power Density Multi-Chip Modules, Rishi Ruben Palanikumar
Experimental And Analytical Study Of A Self-Regulated Flow Control Device Developed For Dynamic Cold-Plates To Cool High-Power Density Multi-Chip Modules, Rishi Ruben Palanikumar
Mechanical and Aerospace Engineering Theses - Archive
Modern high-power density modules often demand high amounts of power be invested in their cooling processes. Uneven heating at the chip level creates hotspots and temperature gradients across the module. A very effective way to conserve pumping power and address hotspots on the module is by targeted delivery of liquid coolant. One way to enable such targeted delivery of coolant is by using dynamic cold-plates (DCP) coupled with self-regulated flow control devices. This paper deals with the optimization and characterization of one such flow control device (FCD). The self-regulated FCD is actuated by a heat reactive shape memory alloy, Nitinol. …
Comparison Of Nonlinear Filters For An Autonomous Lunar Mission Using Existing Navigation Techniques, Matthew David Shaver
Comparison Of Nonlinear Filters For An Autonomous Lunar Mission Using Existing Navigation Techniques, Matthew David Shaver
Mechanical and Aerospace Engineering Theses - Archive
Navigation systems play an important role for autonomous spacecraft. Earth based navigation systems such as GPS provide accurate positioning for orbiting spacecraft. In the case of lunar orbit, GPS is not available so other navigation techniques have to be used. This thesis proposes a novel idea to use Laser Ranging Retroreflectors, placed on the Moon's surface during the Apollo program, as a means of providing position information to an orbiting autonomous spacecraft. An Inertial Navigation System consisting of fusion of LRRR position data and Inertial Measurement Unit providing gyro and accelerometer data will be utilized during orbit about the Moon. …
Impact Of Thermal Aging On Crack Growth Behavior Of Lead Free Solder Interconnects, Anuraag Girish Karnik
Impact Of Thermal Aging On Crack Growth Behavior Of Lead Free Solder Interconnects, Anuraag Girish Karnik
Mechanical and Aerospace Engineering Theses - Archive
Reliability assessment helps in better performance of electronic packages. This also helps electronic device manufacturing company as well as the users to evaluate the life of any device. The microstructure, mechanical response, and failure behavior of Pb-free solder joints in electronic assemblies are constantly evolving when exposed to isothermal aging and/or thermal cycling environments. Due to reflow process or exposure to harsh environment conditions, packages are subject to fatigue loads which can accelerate crack growth in the solder interconnects. But, some material after aging get hardened and decrease in plastic deformation capacity. This effect sometimes leads to better crack resistance …
Finite Element Analysis Of Composite Reactor Pressure Vessel, Tejas Vasant Mhetre
Finite Element Analysis Of Composite Reactor Pressure Vessel, Tejas Vasant Mhetre
Mechanical and Aerospace Engineering Theses - Archive
Reactor Pressure Vessel is the container designed to hold gases or liquids above atmospheric pressure. The focus of this study is to develop Finite Element Model to predict the performance of composite reactor pressure vessel subjected to extreme pressure and temperature and compare with pressure vessel manufactured using conventional materials. In the first part of the study, a pressure vessel system with Carbon steel material under design pressure and temperature have been analyzed for stresses, deformation and Safety Factor. Various loading cases have been discussed during the analysis of pressure vessel. Composite materials have been a suitable replacement to the …
Development And Validation Of The Deliquescent Relative Humidity Test Method For The Accumulated Particulate Matter Found In A Data Center Utilizing An Airside Economizer, Roshan Anand
Mechanical and Aerospace Engineering Theses - Archive
Data centers are virtual or physical infrastructure utilized by enterprises to house computer, server and networking systems and other vital components for the needs of the company’s information technology mainly serving the purpose of storing, processing and serving large amounts of mission critical data to clients. As data centers house a network’s most critical systems and are extremely vital for the continuity of daily operations, every organization prioritizes the reliability and security of data centers and their information. A remarkable amount of data center energy is consumed in eliminating the heat generated by Information Technology (IT) equipment to maintain and …
Accelerated Thermal Cycling Of Printed Circuit Board For Single Phase Immersion Cooling Systems, Surya Duraisamy Asokan
Accelerated Thermal Cycling Of Printed Circuit Board For Single Phase Immersion Cooling Systems, Surya Duraisamy Asokan
Mechanical and Aerospace Engineering Theses - Archive
The adoption of immersion cooling of data center over conventional air-cooling is one among the more up to date advances that individuals have begun embracing to. Acknowledgement of Single phase Liquid Immersion cooling (Sp-LIC) of Information Technology equipment gives proficient cooling frameworks and significant vitality energy savings. This study centers on the unwavering reliability assessment in analyzing the material property of Printed Circuit Board (PCB) and performing Scanning Electron Microscope (SEM) scanning of the samples for any penetration of liquids into PCB. The Accelerated Thermal Cycling (ATC) test in view of ATC JEDEC is relevant just for air cooling. The …
Human Robot Interaction With Cloud Assisted Voice Control And Vision System, Ravi Patel
Human Robot Interaction With Cloud Assisted Voice Control And Vision System, Ravi Patel
Mechanical and Aerospace Engineering Theses - Archive
The objective of this research is to investigate a way of interaction between humans and robots, which is through voice or speech commands. A Biomimetic Artificial Hand (BAH) is used as a platform to perform grasping tasks using human voice as an interacting and instructing medium between humans and robots. It is a hands-free approach of issuing commands to the BAH since it does not require the user to wear any specialized equipment. Previous research has shown difficulties in recognizing more than one word, database management for stored voice, and requirement of sufficient computing power. National Instruments software LabVIEW and …