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Articles 1441 - 1470 of 3914
Full-Text Articles in Engineering
Management Of A University Satellite Program With Focus On A Refrigerant-Based Propulsion System, Shawn W. Miller
Management Of A University Satellite Program With Focus On A Refrigerant-Based Propulsion System, Shawn W. Miller
Masters Theses
"The Missouri University of Science and Technology Satellite (M-SAT) design team has established a satellite program to develop a pair of satellites to perform an autonomous formation flight mission. The resulting configuration was assembled for the Air Force Research Lab University Nanosat Program. This document, written by the Program Manager and former member of the Propulsion subsystem, is a description of the management process used by the team to develop a satellite configuration. Included in the document is a discussion of team organization, techniques for managing a program, and lessons learned during the 2007 to 2008 timeframe. The managing techniques …
Quantification Of Channel Performance And Development And Characterization Of Small Magnetic Field Probes, Surbhi Mittal
Quantification Of Channel Performance And Development And Characterization Of Small Magnetic Field Probes, Surbhi Mittal
Masters Theses
"This thesis presents a new approach to quantifying channel performance using a transmitter waveform and dispersion penalty (TWDP) with frequency domain S-parameter data. Initially TWDP was defined to characterize the performance of a transmitter in optical links. More recently its use has been extended to include the quantification of channel performance, especially in high-speed copper links. This project focused mainly on channel characterization. Instead of using the time-domain oscilloscope measurements involved in the original approach, it proposes a new method that relies on frequency-domain S-parameter data obtained either from measurements or simulations. It included a parametric study of TWDP with …
Control And Design Considerations In Electric-Drive Vehicles, Shweta Neglur
Control And Design Considerations In Electric-Drive Vehicles, Shweta Neglur
Masters Theses
"Electric-drive vehicles have been identified as one of the promising technologies of the future. Electric-drive vehicles including fuel cell, hybrid electric, and plug-in hybrid electric vehicles have the potential to improve the fuel economy and reduce gas emissions when compared to conventional vehicles. One of the important challenges in the advancement of the electric-drive vehicles is to develop a control strategy which meets the power requirements of the vehicles. The control strategy is an algorithm designed to command the battery and the internal combustion engine of the vehicle for specific power demands. In this thesis, load follower and thermostat control …
Optimization Of Parameters And Study Of Kinetics In Lactulose Production By Lactose Isomerization Using Strong Basic Anion Exchange Resin, Arvind Nanduri
Optimization Of Parameters And Study Of Kinetics In Lactulose Production By Lactose Isomerization Using Strong Basic Anion Exchange Resin, Arvind Nanduri
Masters Theses
"In this work, an experimental design was employed to investigate the effects of different operating conditions on the isomerization of lactose to lactulose by using strong basic anion exchange resin (AMBERLITE-IRA 402). Temperature, resin/lactose mass ratio and pH were considered to be the three factors affecting the conversion of lactose. Box-Behnken design was then used to optimize the operating conditions for maximum response and also to study the various interaction and main effects of the factors. The analysis of variance (ANOVA) of the experimental data showed a high correlation coefficient R² (0.99) and a low root mean square error (2.84) …
Modeling And Analysis Of High-Speed Sources And Serial Links For Signal Integrity, Siming Pan
Modeling And Analysis Of High-Speed Sources And Serial Links For Signal Integrity, Siming Pan
Masters Theses
"As the computer and electronics industry moves towards higher data rates, signal integrity and electromagnetic interference (EMI) problems always present challenges for designers for high-speed data communication systems. To characterize the entire link path between transmitters and receivers, accurate models for sources, passive link path (such as traces, vias, connectors, etc), and terminations should be built before simulations either in frequency or time domain. Due to the imperfection of model, data corrections are preferred before time-domain simulations to ensure stability. Moreover, data obtained from models should be compared with measurement results to judge the level of agreement for validations. This …
Time-Domain Thru-Reflect-Line (Trl) Calibration Error Assessment And Its Mitigation And Modeling Of Multilayer Printed Circuit Boards (Pcb) With Complex Area Fills, Vysakh Sivarajan
Masters Theses
"Part 1 for this thesis is on the error assessment of a time-domain (t-TRL) calibration technique. Application of the "Thru-Reflect-Line" (TRL) calibration to time-domain measurements of S-parameters (t-TRL) can be used for the characterization of the printed circuit boards (PCBs). However, t-TRL calibrated results still have deviations from the reference frequency-domain vector network analyzer (VNA) calibrated results. There are two main sources of errors in the t-TRL calibration. They are random errors, such as an additive noise and jitter, and systematic errors associated with cables, connectors, and port mismatches. This work addresses these two types of errors by proper selection …
Determining The R Values For 12 Inch Deep Z-Purlins And Girts With Through-Fastened Panels Under Suction Loading, Kaye Dee Wibbenmeyer
Determining The R Values For 12 Inch Deep Z-Purlins And Girts With Through-Fastened Panels Under Suction Loading, Kaye Dee Wibbenmeyer
Masters Theses
"Designing purlins for roof systems attached to through-fastened panels has been a subject well researched in the past. The current design specification uses a simplified approach to the designing of these members where the fully braced moment capacity of such members is multiplied by a reduction factor, commonly referred to as the R-value. This value represents the point in between the fully braced and fully unbraced member behavior. However, the current AISI Specification, S100, only contains R-values for purlins and girts up to 11.5 inches in depth. Since manufacturers are now rolling sections up to 12 inches deep, two confirmatory …
Corrosion Resistance Of Enamel-Coated Steel Reinforcement For Concrete, Charles Robert Werner
Corrosion Resistance Of Enamel-Coated Steel Reinforcement For Concrete, Charles Robert Werner
Masters Theses
"Originally developed to enhance the bond between concrete and steel, reactive enamel coatings have shown great promise in protecting steel from corrosive environments. However, the corrosion resistance of the material has not yet been tested beyond 40 days. Moreover, when the material was tested, it was applied to smooth steel pins, not deformed steel bars which are commonly used in reinforced concrete structures. Therefore, this study focused on the corrosion resistance of three different enamel coatings, along with a standard epoxy coating, each of which were applied to both smooth and deformed steel bars and included both short-term and long-term …
Synthesis And Characterization Of Microspheres For Controlled Release, Gurpartap Singh Sandhu
Synthesis And Characterization Of Microspheres For Controlled Release, Gurpartap Singh Sandhu
Masters Theses
"Synthetic hydroxyapatite (HAp, (Ca₁₀(PO₄)₆(OH)₂) has always been of interest in medical applications because of its similarities to inorganic bone matrix. It has been used in biomedical applications for bone repair and substitution due to its biocompatibility. However, there are some differences in the stoichiometry, composition, and mechanical properties of human bone as compared to pure HAP. HAp particles have been successfully used as drug delivery carriers which deliver the drug to the affected part of the body and the remaining apatite gets degraded by the physiological processes in the body. In the present work, emphasis was on developing mechanically stronger …
Nonlinear Finite Element Formulation Of The Soil Structure Interaction Through Two Parameter Foundation Model, Taraka Ravi Shankar Mullapudi
Nonlinear Finite Element Formulation Of The Soil Structure Interaction Through Two Parameter Foundation Model, Taraka Ravi Shankar Mullapudi
Masters Theses
"The response of shallow and raft foundations is having a significant importance due to its complex behavior because of the semi-infinite soil media. Winkler's model is the simplest model to deal with the structure and soil. The Winkler model represents the foundation reaction as proportional to the soil displacement at a particular point, which results in the elasticity of the soil being the only parameter in consideration. But in reality the soil cohesiveness is having a significant contribution in soil structure interaction, and therefore the consideration of coupling effects of Winkler springs need to be accounted. Most of the existing …
Application Of Quality Function Deployment In New Product And Service Development, Anusha Uppalanchi
Application Of Quality Function Deployment In New Product And Service Development, Anusha Uppalanchi
Masters Theses
"Quality Function Deployment (QFD) is a systematic process to integrate customer requirements into every aspect of the design and delivery of products and services. Understanding the customers wants or needs from a product or service is crucial to the successful design and development of new products and services. QFD is a system that utilizes customer demands to meet client missions by outlining what the customer wants in a service or product. QFD was used in this research to determine customer needs and thus to ensure that customer demands are met. This methodology is demonstrated using two case studies: Hydrogen Fuel …
A Numerical Investigation Of Flowfield Modification In High-Speed Airbreathing Inlets Using Energy Deposition, Matthew Flynn Rohweder
A Numerical Investigation Of Flowfield Modification In High-Speed Airbreathing Inlets Using Energy Deposition, Matthew Flynn Rohweder
Masters Theses
"Energy deposition in front of dual-mode ram/scramjet engines is numerically investigated utilizing two-dimensional CFD for its potential to modify inlet/isolator flow-fields for engine start/unstart control and for its general potential for generating large-scale flow-field modification in such flows. A simplified (high Mach number) constant-area duct geometry is initially defined in order to test the feasibility of the concept; the results from this initial investigation demonstrates possible beneficial effects of depositing energy upstream of a thermally choked duct in terms of causing massive changes in flow patterns, including the reestablishment of supersonic flow throughout the duct. This study is followed by …
Characterizing Near-Field Circuit Board Radiation Using Crossed Electric And Magnetic Dipole Sources, Weiping He
Characterizing Near-Field Circuit Board Radiation Using Crossed Electric And Magnetic Dipole Sources, Weiping He
Masters Theses
"A method to analyze radiated emissions of electronic components/circuits is presented in this thesis. More specifically the purpose of this approach is to determine an equivalent source model to accurately represent the radiated emissions produced by the circuits and components. The proposed equivalent source model, which is able to predict both electric and magnetic fields at various distances from the device under test, consists of an array of both electric and magnetic dipoles. Each source point includes two electric dipoles orientated in x and y directions and two magnetic dipoles in x and y directions"--Abstract, page iii.
Characterization Of The Neutron Flux Spectrum At The Missouri University Of Science And Technology Research Reactor, Zachary Andrew Kulage
Characterization Of The Neutron Flux Spectrum At The Missouri University Of Science And Technology Research Reactor, Zachary Andrew Kulage
Masters Theses
"A new remotely accessible shielded cell is being constructed at the Missouri University of Science and Technology Research Reactor (MSTR). The heavily shielded cell will be able to receive highly irradiated specimens directly from the reactor and will be equipped with radiation-hardened cameras, remote manipulators and gamma spectroscopy. The cell will allow the manipulation and monitoring of highly activated specimens from both a workstation at the MSTR and at remote locations using a Webbased internet interface. The ability to access and control the shielded cell via a remote internet connection will make it useful to a wide variety of users. …
Fabrication Of A Memory Device Using Polyaniline Nanofibers And Gold Nanoparticles, Krunal R. Waghela
Fabrication Of A Memory Device Using Polyaniline Nanofibers And Gold Nanoparticles, Krunal R. Waghela
Masters Theses
"Fabrication of a memory device using one-step/one-pot synthesis for making a PANI (polyaniline)/Au nanocomposite is reported. Although various devices with horizontal and vertical electrode structures were made, the basic structure used consisted of a PANI/Au thin film sandwiched between two electrodes. The ratio of the current in the OFF state to the current in the ON state was seen to be as high as 5000. These devices showed a bistable behavior, which is typical of memory devices. The PANI/Au nanocomposite thin film was constructed right on the electrode using microfabrication techniques with ultraviolet irradiation. The fabrication techniques discussed in this …
The Effectiveness Of The Natural Resource Conservation Service (Nrcs) And Huff Rainfall Distribution Methods For Use In Detention Basin Design, Todd Wayne Dablemont
The Effectiveness Of The Natural Resource Conservation Service (Nrcs) And Huff Rainfall Distribution Methods For Use In Detention Basin Design, Todd Wayne Dablemont
Masters Theses
"This thesis focuses on the effectiveness of the NRCS and Huff rainfall distribution methods for use in detention basin design. This study required the use of HEC-HMS, hydrologic modeling software, in order to analyze the distribution methods. Three separate detention basins and their watersheds were modeled for this study. The watersheds were analyzed for both undeveloped and developed conditions. The parameters analyzed include detention basin inflow, detention basin outflow, watershed peak discharge, and detention basin storage capacity. The determination of detention basin effectiveness was based upon these parameters. The NRCS distribution method is widely used; however, many who use it …
Integration And Test Of A Refrigerant-Based Cold-Gas Propulsion System For Small Satellites, Ryan Alan Pahl
Integration And Test Of A Refrigerant-Based Cold-Gas Propulsion System For Small Satellites, Ryan Alan Pahl
Masters Theses
"Due to the launch safety constraints placed on university-built small satellites, designing a low-cost propulsion system to meet mission requirements presents a significant challenge to aspiring student engineers. The Missouri University of Science and Technology is currently developing a low-cost, two-phase propulsion system using the refrigerant R-134a as the propellant that can be stored at low pressures while still providing sufficient performance to meet mission goals. The purpose of this study is to present the testing results of a refrigerant-based cold gas system utilizing R-134a as a saturated liquid propellant and the ability to design this system to be portable …
Fpga Implementation Of Pso Algorithm And Neural Networks, Parviz Palangpour
Fpga Implementation Of Pso Algorithm And Neural Networks, Parviz Palangpour
Masters Theses
"This thesis describes the Field Programmable Gate Array (FPGA) implementations of two powerful techniques of Computational Intelligence (CI), the Particle Swarm Optimization algorithm (PSO) and the Neural Network (NN). Particle Swarm Optimization (PSO) is a popular population-based optimization algorithm. While PSO has been shown to perform well in a large variety of problems, PSO is typically implemented in software. Population-based optimization algorithms such as PSO are well suited for execution in parallel stages. This allows PSO to be implemented directly in hardware and achieve much faster execution times than possible in software. In this thesis, a pipelined architecture for hardware …
Microalgal Bioremediation Of Nutrients In Wastewater And Carbon Dioxide In Flue Gas, Anand Murali Narasimhan
Microalgal Bioremediation Of Nutrients In Wastewater And Carbon Dioxide In Flue Gas, Anand Murali Narasimhan
Masters Theses
"Microalgae are potential biofuel feedstocks that can provide solutions to the twin challenges of energy security and environmental pollution. They have great potential for the removal of excess nitrogen and phosphorus from wastewater including the farm runoff. They can capture carbon dioxide in the flue gas from coal fired power plants thereby reducing greenhouse gas and also producing algal biomass, which can be converted into biofuel. In this study, the nutrient consumption of Scenedesmus algae was investigated in a batch culture and the biomass yield was determined. Algae were able to utilize carbon in the form of soluble carbonates which …
Quantification Of Product Color Preference In A Utility Function, Hannah L. Turner
Quantification Of Product Color Preference In A Utility Function, Hannah L. Turner
Masters Theses
"Currently, many marketing and engineering tools exist to help a designer optimize quantitative attributes of a product, such as height, weight, volume, or cost. However, these methods cannot effectively take into consideration aesthetic attributes of a product, or any other attributes for which there is no understood functional relationship between the attribute's potential values and the consumer's preference. This research has begun the work of developing this necessary functional relationship for the aesthetic attribute of color and has created a methodology for further research. To do this, colors were represented by their red, green, and blue light components, and preference …
Energy Expenditure Analysis Of Redesigned Mechanical Assists For Medium Girder Bridge, Karthik Kumar
Energy Expenditure Analysis Of Redesigned Mechanical Assists For Medium Girder Bridge, Karthik Kumar
Masters Theses
"U.S. Army bridge crew soldiers perform tough manual material handling (MMH) tasks during the assembly of a Medium Girder Bridge (MGB). The bridge parts are very heavy and are manually lifted from pallets, carried to the construction site and assembled with other bridge parts. An energy expenditure study on the soldiers handling the bridge parts revealed that the energy expenditure rate of the soldiers exceeds the NIOSH prescribed safety limit of 3.5 Kcal/min. This leads to high risk of musculoskeletal disorders. The study deals with modifying the first redesign of mechanical assists for medium girder bridge (MGB) and studying the …
Control And Applications Of Double Input Dc-Dc Power Electronic Converters, Venkata Anand Kishore Prabhala
Control And Applications Of Double Input Dc-Dc Power Electronic Converters, Venkata Anand Kishore Prabhala
Masters Theses
"Multi-input power electronic converters (MIPEC) are increasingly gaining interest in the fields of renewable energy systems and hybrid electric vehicles (HEV). The main advantage of MIPECs is their ability to interface several energy sources and storage devices using a single power conversion stage. Therefore, they provide simpler control and smaller parts count. In this thesis, various aspects of the utilization of double-input (DI) converters in solar and HEV applications are explored. For instance, a DI buckboost topology is proposed for a photovoltaic (PV)/battery energy system. The converter is controlled in a way that maximum power is drawn from the PV …
A Comparative Study Of Capacitor Voltage Balancing Techniques For Flying Capacitor Multi-Level Power Electronic Converters, Vennela Yadhati
A Comparative Study Of Capacitor Voltage Balancing Techniques For Flying Capacitor Multi-Level Power Electronic Converters, Vennela Yadhati
Masters Theses
"With the advent of multilevel converters for high power applications in industry, a need to develop simpler topologies and control techniques has arisen. The flying capacitor multilevel inverter (FCMLI) is one such topology which is gaining popularity in recent years with many advantages such as extra ride-through capabilities because of the capacitor storage, redundancy in switching states, low common mode voltage ratio, improved power quality, etc. In this thesis, different basic multilevel converter topologies and their advantages and applications are discussed. The thesis mainly focuses on single-phase five-level FCMLI topology. Different control techniques for capacitor voltage regulation like staircase modulation, …
Improving Resiliency Using Graph Based Evolutionary Algorithms, Jayakanth Jayachandran
Improving Resiliency Using Graph Based Evolutionary Algorithms, Jayakanth Jayachandran
Masters Theses
"Resiliency is an important characteristic of any system. It signifies the ability of a system to survive and recover from unprecedented disruptions. Various characteristics exist that indicate the level of resiliency in a system. One of these attributes is the adaptability of the system. This adaptability can be enhanced by redundancy present within the system. In the context of system design, redundancy can be achieved by having a diverse set of good designs for that particular system. Evolutionary algorithms are widely used in creating designs for engineering systems, as they perform well on discontinuous and/or high dimensional problems. One method …
Signal Analysis For Multiple Target Materials Through Wavelet Transforms, Rajat Pashine
Signal Analysis For Multiple Target Materials Through Wavelet Transforms, Rajat Pashine
Masters Theses
"Signal identification based on different sensing systems like microwaves, infra-red, x-rays and terahertz waves is one of the classic problems in signal processing. Earlier methods had relied mainly on the amplitude spectrum obtained by these sensing techniques mainly due to non-availability of the phase information for the signals. Most of them are based on techniques like absorbance spectrum that requires a reference material's signal for the test material's identification. They are also sensitive to noise and highly dependent on the peak detection algorithms. Modern equipments with both amplitude and phase information provide an opportunity for time-domain signal based methods that …
Implementing Frequency Regulation Capability In A Solar Photovoltaic Power Plant, Venkata Ajay Kumar Pappu
Implementing Frequency Regulation Capability In A Solar Photovoltaic Power Plant, Venkata Ajay Kumar Pappu
Masters Theses
"Photovoltaic power plants pose some challenges when integrated with the power grid. Today's PV plants focus on extracting the maximum power from the arrays. This makes the PV system unavailable for helping in regulating the grid frequency as compared to conventional synchronous generators. A new technique for tracking a pseudo-maximum power point for creating power reserve is presented. This will help provide fast response in injecting power to respond to rapid load changes in a manner analogous to the inertia of a rotating machine. This helps in contributing toward frequency regulation. This thesis examines the implementation of a two stage …
Application Of Life Cycle Assessment To Estimate Environmental Impacts Of Surface Coal Mining, Ofentse Ditsele
Application Of Life Cycle Assessment To Estimate Environmental Impacts Of Surface Coal Mining, Ofentse Ditsele
Masters Theses
"Coal plays an important role in meeting the energy needs of the World. Given its abundance and low cost, its use is bound to increase with the growing energy demand. Despite its importance, there are concerns over coal's environmental burdens. In order to extract and use coal in a sustainable manner, sustainability assessment has to be comprehensive. Life Cycle Assessment (LCA) provides systematic and quantifiable measures for assessing environmental burdens of products and processes. Extensive LCA work has been done on coal use, particularly in electricity generation, but, the coal mining stage has been neglected, for the most part. This …
Simulation Of Pem Fuel Cells: Validation Of Model And Incorporation Of Humidity Dynamics, Steven Francis Rodgers
Simulation Of Pem Fuel Cells: Validation Of Model And Incorporation Of Humidity Dynamics, Steven Francis Rodgers
Masters Theses
"Fuel cell technologies have been receiving increased attention by industry and researchers due to growing societal and inevitable economic pressures to find an alternative for fossil fuels. At the forefront of this is the demand for fuel cell models: models to elucidate fundamental physical phenomena underlying fuel cell function and models that are not computationally demanding yet reasonably accurate to allow designers to incorporate fuel cells into consumer products. One of the latter type has recently been developed based on a software package that is already in widespread use in the automotive industry for the simulation of mechanical, thermal, electrical, …
Finite Element Analysis And Fatigue Test On The Bicuspids To Support Theory Of Abfraction, Madhuchandra Mahadevaswamy
Finite Element Analysis And Fatigue Test On The Bicuspids To Support Theory Of Abfraction, Madhuchandra Mahadevaswamy
Masters Theses
"Abfraction is a small crack or notch found at the cervical areas of a teeth due to the loss of enamel tissues in the teeth. Proposed explanations for are that it is caused by toothbrush abrasion, acid erosion, and the mechanical forces applied on the teeth due to chewing, biting, tongue activity. There is disagreement among dentists as to the primary causes of abfraction. Some dentists believe that abfraction is caused by toothbrush abrasion and erosion due to acidic food and drinks. Other dentists believe that tensile and compressive forces acting on the teeth from non-axial, cyclical loading over an …
Evaluation Of Metal Detection Audio Alert Signals Of An/Pss-14 By Means Of Real Time Visualization, Sandesh Srikantaiah Chandrashekar
Evaluation Of Metal Detection Audio Alert Signals Of An/Pss-14 By Means Of Real Time Visualization, Sandesh Srikantaiah Chandrashekar
Masters Theses
"The sweep arm of the AN/PSS-14 Landmine Detector attached to an independent visualization device will transform the AN/PSS-14 into a hand-held data acquisition system for conversion of real time MD and GPR audio alert signals into captured visual trace displays on an on-board PDA computer screen so that momentary sounds of millisecond durations can be captured and displayed for visual scrutiny and interpretation by analytical on-board data processing procedures. This is a part of a two-man team that is developing a visual data adapter for the AN/PSS-14 Landmine Detector where the current thesis is concentrating only on MD audio alerts. …