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Utilization Of Booster Fans In Underground Mines, Arash Habibi Javanbakht Jan 2013

Utilization Of Booster Fans In Underground Mines, Arash Habibi Javanbakht

Masters Theses

"Booster fans are large underground fans that can increase the volumetric efficiency of ventilation systems by balancing the pressure and quantity distribution throughout a mine, reducing leakage and reducing the total power requirement. The objective of this study is to provide potential users of booster fans with the necessary information on the design, installation and operation of main underground fans. The guidelines listed in this paper were formulated based on current U.S. and international standards, safe operating practices developed by the mining industry, and recommendations provided by fan manufacturers. The principles involved in the design and installation of booster fans …

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A Friction Prediction Model For Small Si Engines, Avinash Singh Jan 2013

A Friction Prediction Model For Small Si Engines, Avinash Singh

Masters Theses

"A substantial portion of the input fuel energy in an SI engine is lost towards overcoming the frictional forces from various rubbing parts. These frictional losses are very significant in small engines and these losses can be reduced by incorporating some design changes. A semi-empirical friction prediction model was studied and modified with the help of the experimental results for small SI engines. This model is dependent upon engine geometry and speed. The model divides the frictional work into different sub-assemblies of the engine and these sub-assemblies are in turn divided to determine the friction associated with individual components. A …

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Direct - Drive Permanent Magnet Synchronous Generator Design For Hydrokinetic Energy Extraction, Amshumaan Raghunatha Kashyap Jan 2013

Direct - Drive Permanent Magnet Synchronous Generator Design For Hydrokinetic Energy Extraction, Amshumaan Raghunatha Kashyap

Masters Theses

"Hydrokinetic turbines deliver lower shaft speeds when compared to both steam and wind turbines. Hence, a water wheel generator must operate at speeds as low as 150 - 600 rpm. This thesis describes a permanent magnet synchronous generator (PMSG) that was designed, built, and tested to serve a low speed hydrokinetic turbine. The design methodology was emphasized since designing an application specific generator poses various design and hardware construction issues. These are torque, speed, power and start-up requirements. This generator was built to operate without a speed increaser, implying very low speeds. FEA and performance results from the simulation done …

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A Calibration Free Vector Network Analyzer, Arpit Kothari Jan 2013

A Calibration Free Vector Network Analyzer, Arpit Kothari

Masters Theses

"Recently, two novel single-port, phase-shifter based vector network analyzer (VNA) systems were developed and tested at X-band (8.2 - 12.4 GHz) and Ka-band (26.4 - 40 GHz), respectively. These systems operate based on electronically moving the standing wave pattern, set up in a waveguide, over a Schottky detector and sample the standing wave voltage for several phase shift values. Once this system is fully characterized, all parameters in the system become known and hence theoretically, no other correction (or calibration) should be required to obtain the reflection coefficient, (Γ), of an unknown load. This makes this type of VNA "calibration …

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Stochastic-Optimization Of Equipment Productivity In Multi-Seam Formations, Elijah Adadzi Jan 2013

Stochastic-Optimization Of Equipment Productivity In Multi-Seam Formations, Elijah Adadzi

Masters Theses

"Short and long range planning and execution for multi-seam coal formations (MSFs) are challenging with complex extraction mechanisms. Stripping equipment selection and scheduling are functions of the physical dynamics of the mine and the operational mechanisms of its components, thus its productivity is dependent on these parameters. Previous research studies did not incorporate quantitative relationships between equipment productivities and extraction dynamics in MSFs. The intrinsic variability of excavation and spoiling dynamics must also form part of existing models. This research formulates quantitative relationships of equipment productivities using Branch-and-Bound algorithms and Lagrange Parameterization approaches. The stochastic processes are resolved via Monte …

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Development Of An Optimization Model To Determine Sampling Levels, Zlatan Hamzic Jan 2013

Development Of An Optimization Model To Determine Sampling Levels, Zlatan Hamzic

Masters Theses

"As the complexity of multi-component products increases the quality of these products becomes increasingly difficult to control. The first step to manufacturing a quality product is making sure that the components of the product meet specifications. Product quality can be controlled through sampling inspection of the components. Two models were developed in this research to determine the optimal sampling levels for incoming lots containing parts for production and assembly of multi-component systems. The main objective of the first model is to minimize the expected cost that is associated with a nonconforming item reaching assembly. In this model the time available …

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Use Of Ultra-High Performance Concrete To Mitigate Impact And Explosive Threats, Julie Anne Willey Jan 2013

Use Of Ultra-High Performance Concrete To Mitigate Impact And Explosive Threats, Julie Anne Willey

Masters Theses

"This study is a continuation of research conducted by Natalia Carey, Anthony Wulfers, and Dr. John Myers under the DHS ALERT Center. Carey investigated the use of polyurea coating systems to mitigate close range blast threats on wall panels. Wulfers continued this by using both polyurea coatings as well as a sacrificial wood fiber fly ash (WF-FA) layer to try to get increased performance. This research was aimed at the study of ultra-high performance concrete (UHPC) for the use in impact and blast mitigation. There is little information on the performance of UHPC under close range blast loading; therefore it …

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A Study Of Clustering Rssi And Lqi From Wireless Network Communications, Yanwen Wang Jan 2013

A Study Of Clustering Rssi And Lqi From Wireless Network Communications, Yanwen Wang

Masters Theses

"In today's information world, different wireless sensor network topologies are permitted to exist in the same geographical region. For example, a city contains thousands of enterprise networks; a school might include different wireless network topologies used by students and faculties respectively. Even within a building, there might be multiple companies that use their own wireless networks. These networks might cause interference to other networks. How to detect, determine and locate the unknown wireless topologies in the same geographical area becomes quite significant in the wireless industry, especially in military use, such as spy-nodes detection and communication orientation systems. In this …

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Effects Of Material Variables And Process Parameters On Properties Of Investment Casting Shells, Priyatham Tumurugoti Jan 2013

Effects Of Material Variables And Process Parameters On Properties Of Investment Casting Shells, Priyatham Tumurugoti

Masters Theses

"Manufacture of investment casting shells is a complex process. The choice of raw materials - refractory powders or grains, binders and additives - affects the properties of investment casting shells. In this study, different systems of shells were prepared, according to a design of experiments, with commercially available raw materials that differ in chemistry, particle size or particle size distribution. Shell strength was measured in green, fired and cooled, and hot conditions and the results were analyzed for strength-material property relation. Various microstructures of polished cross sections of these shells were characterized using scanning electron microscope. It was determined that …

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Improving Life Cycle Management Plans For Power Plant Components, Srinath Raghavan Jan 2013

Improving Life Cycle Management Plans For Power Plant Components, Srinath Raghavan

Masters Theses

"Life cycle management (LCM) combines a set of technical and economic activities with the specific goal of improving the long term economic value of an asset. It is necessary to perform a sound LCM exercise on the utility or industrial asset to maintain the profitability of a plant. In most industries, the maintenance budget is either higher than optimal or lower than required, that result in expensive outages, damages and accidents. An LCM plan is a guide to make operational decision for a component over its life cycle. LCM typically consists of a preventive maintenance schedule, condition monitoring, inspection activities, …

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Sybil Detection In Vehicular Networks, Muhammad Ibrahim Almutaz Jan 2013

Sybil Detection In Vehicular Networks, Muhammad Ibrahim Almutaz

Masters Theses

"A Sybil attack is one where an adversary assumes multiple identities with the purpose of defeating an existing reputation system. When Sybil attacks are launched in vehicular networks, an added challenge in detecting malicious nodes is mobility that makes it increasingly difficult to tie a node to the location of attacks. In this thesis, we present an innovative protocol for Sybil detection in vehicular networks. Considering that vehicular networks are cyber-physical systems integrating cyber and physical components, our technique exploits well grounded results in the physical (i.e., transportation) domain to tackle the Sybil problem in the cyber domain. Compared to …

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Effects Of Machining Parameters And Cooling Strategies On Cutting Forces And Surface Integrity In High-Speed Slot End-Milling Of Titanium Alloy, Emenike Chukwuma Jan 2013

Effects Of Machining Parameters And Cooling Strategies On Cutting Forces And Surface Integrity In High-Speed Slot End-Milling Of Titanium Alloy, Emenike Chukwuma

Masters Theses

“Paper 1 presents the results of the investigations of the effects of cooling strategies [Emulsion cooling, Minimum Quantity Lubrication (MQL) and Liquid Nitrogen (LN2)] and machining parameters (feed rate and spindle speed) on cutting force components, cutting temperature and tool wear during slot end-milling of titanium Ti-6Al-4V workpiece. All machining experiments were conducted using four-flute 0.5 inch diameter uncoated solid carbide end-mill on Cincinnati Milacron, Sabre 750 vertical machining center equipped with Acramatic 2100 controller. Cutting force components were acquired and tool wear was indirectly measured from maximum cutting force variation per slot from the first pass to …

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Effects Of Machining Parameters On Cutting Forces,Shear Angle And Friction In Orthogonal Turning Of Titanium Alloys, Hilary Onyishi Jan 2013

Effects Of Machining Parameters On Cutting Forces,Shear Angle And Friction In Orthogonal Turning Of Titanium Alloys, Hilary Onyishi

Masters Theses

“Paper 1 presents the results of the investigations on the effects of machining parameters on cutting forces, shear angle and friction in orthogonal turning of titanium alloy tube. Uncoated fine-grained cemented tungsten carbide (WC/Co) and Physical Vapour Deposition (PVD) TiAlN coated grade turning tool inserts, with 5⁰ and 15⁰ rake angles were used under low and high cutting speeds of 120 and 240m/min, at three different feedrates (0.05, 0.075 and 0.1 mm/rev). The experiments were conducted under flooded coolant to reflect what is practically obtainable in manufacturing industries. The experimental results show that cutting forces at two selected cutting speeds …

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Rotary Displacement Piezoelectric Energy Harvester, Headman Sanei Jan 2013

Rotary Displacement Piezoelectric Energy Harvester, Headman Sanei

Masters Theses

“This study proposes a novel piezoelectric energy harvester for rotary motion applications. It is based on an annular unimorph plate, mounted on a shaft rotating at a constant angular velocity, under constant amplitude point-wise force. The mathematical model and the analysis was proposed for the inverse problem of a rotating disk under a static stationary force. The disk, however, is assumed to be stationary subjected to a traveling force. The distributed parameter electromechanical equations governing the behavior of the system are provided in closed-form, incorporating both an AC and a simple rectifier circuit. The performance of the energy harvester was …

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Creating New Superconducting & Semiconducting Nanomaterials And Investingating The Effect Of Reduced Dimensionality On Their Properties, Sukhada Mishra Jan 2013

Creating New Superconducting & Semiconducting Nanomaterials And Investingating The Effect Of Reduced Dimensionality On Their Properties, Sukhada Mishra

Doctoral Dissertations

"The field of nanomaterials has continued to attract researchers to understand the fundamentals and to investigate potential applications in the fields of semiconductor physics, microfabrication, nanomedicine, surface sciences etc. One of the most critical aspects of the nanomaterials research is to establish synthetic protocols, which can address the underlying product requirements of reproducibility, homogenous morphology and controlled elemental composition. We have focused our research in exploring synthetic routes for the synthesis of superconducting and semiconducting nanomaterials and analyze their structure--property relationship through detailed characterizations. The first part of dissertation is focused on the synthesis of superconducting FeSe nanostructures using catalyst …

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Infiltrated Composite Electrodes For Solid Oxide Fuel Cells, Aligul Buyukaksoy Jan 2013

Infiltrated Composite Electrodes For Solid Oxide Fuel Cells, Aligul Buyukaksoy

Doctoral Dissertations

"Solid oxide fuel cells (SOFCs) are electrochemical devices which can convert chemical energy to electrical energy with efficiencies up to 60%. In order for SOFCs to be favorable energy conversion devices, the power obtained from a unit volume should be improved. This corresponds to minimized resistances from SOFC components (composite electrodes and electrolyte). Stability of the generated power is another important issue. Degradation of SOFCs with time due to microstructural processes or chemical reactions that occur at operating conditions; and due to reduction/oxidation cycles caused by the changes in the anode has been an important obstacle that has prevented the …

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Scaleup And Hydrodynamics Study Of Gas-Solid Spouted Beds, Shreekanta Basavaraj Aradhya Jan 2013

Scaleup And Hydrodynamics Study Of Gas-Solid Spouted Beds, Shreekanta Basavaraj Aradhya

Doctoral Dissertations

"A thorough understanding of the complex flow structure of gas-solid spouted bed is crucial for design, scale-up and performance. Advanced gas-solid optical probes were developed and used to evaluate different hydrodynamic parameters of spouted beds. These optical probes measure solids concentration, velocity and their time series fluctuations. Since solids concentration needs to be converted to solids holdup through calibration, for meaningful interpretation of results, a novel calibration method was proposed (which is inexpensive and reliable compared to the current reported methods) and validated in the present study. The reported dimensionless groups approach of spouted bed scale-up was assessed and was …

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Shear And Fracture Behavior Of High Performance Concretes, Mahdi Arezoumandi Jan 2013

Shear And Fracture Behavior Of High Performance Concretes, Mahdi Arezoumandi

Doctoral Dissertations

"Concrete is the most widely used man-made material in the world. Like other materials, it has been improved over time. Nowadays, with continued development of science and technology, a new generation of concretes is produced and is termed high performance concretes. A review of previously published work indicates that very few studies (in some cases none) have addressed the structural behavior of full-scale, high performance concrete elements. This study investigated the shear and fracture behavior of two types of high performance concrete - high-volume fly ash concrete (HVFAC) and self-consolidating concrete (SCC). The HVFAC incorporates up to 70% cement replacement …

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Two Essays On Dynamic Programming And Reinforcement Learning, Shuva Ghosh Jan 2013

Two Essays On Dynamic Programming And Reinforcement Learning, Shuva Ghosh

Doctoral Dissertations

"The semi-Markov decision process (SMDP) is a variant of the Markov decision process (MOP). This dissertation work focuses on the application of SMDPs to disaster response management and to maintenance management. Average and discounted reward are two popular performance metrics for MDPs/SMDPs. While both dynamic programming (DP) methods, i.e., value iteration and policy iteration, are commonly used to solve MDPs/SMDPs, value iteration is easier to apply than policy iteration. The existing value iteration algorithms for average reward SMDPs have some noteworthy limitations, which are sought to be overcome in this work. Reinforcement learning (RL) techniques, which are also studied in …

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The Guayule Plant: A Renewable, Domestic Source Of Binder Materials For Flexible Pavement Mixtures, David Newton Richardson, Steven Michael Lusher Jan 2013

The Guayule Plant: A Renewable, Domestic Source Of Binder Materials For Flexible Pavement Mixtures, David Newton Richardson, Steven Michael Lusher

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Due to the rising price of crude oil, flexible pavement costs have increased significantly. This price pressure has resulted in the increased use of reclaimed asphalt pavement (RAP) and/or reclaimed asphalt roofing shingles (RAS) because of the binder (asphalt cement) they contain. This has increased demand for recycling (rejuvenating) agents which return the RAP/RAS binders to their original state by 1) restoring maltenes (petroleum oils and resins) that have been depleted due to age-hardening/oxidation, and 2) reducing their viscosity. The project concept was to design a flexible pavement mixture (FPM) produced with little-to-no virgin petroleumbased binder which implied the use …

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Luminescent Laf₃:Ce-Doped Organically Modified Nanoporous Silica Xerogels, Mingzhen Yao, Ryan Hall, Wei Chen, Dhairyashil Mohite, Nicholas Leventis, N. Lu, J. Wang, M. J. Kim, H. Luo, Hongbing Lu Jan 2013

Luminescent Laf₃:Ce-Doped Organically Modified Nanoporous Silica Xerogels, Mingzhen Yao, Ryan Hall, Wei Chen, Dhairyashil Mohite, Nicholas Leventis, N. Lu, J. Wang, M. J. Kim, H. Luo, Hongbing Lu

Chemistry Faculty Research & Creative Works

Organically modified silica compounds (ORMOSILs) were synthesized by a sol-gel method from amine-functionalized 3-aminopropyl triethoxylsilane and tetramethylorthosilicate and were doped in situ with LaF3:Ce nanoparticles, which in turn were prepared either in water or in ethanol. Doped ORMOSILs display strong photoluminescence either by UV or X-ray excitation and maintain good transparency up to a loading level of 15.66% w/w. The TEM observations demonstrate that ORMOSILs remain nanoporous with pore diameters in the 5-10 nm range. LaF3:Ce nanoparticles doped into the ORMOSILs are rod-like, 5 nm in diameter and 10-15 nm in length. Compression testing indicates that …

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Organized Music Instruction As A Predictor Of Nursing Student Success, Sandra K. Cesario, Robert Cesario, Anthony R. Cesario Jan 2013

Organized Music Instruction As A Predictor Of Nursing Student Success, Sandra K. Cesario, Robert Cesario, Anthony R. Cesario

Arts, Languages and Philosophy Faculty Research & Creative Works

Stringent admission criteria exist for nursing programs in the United States, but better predictors of success are needed to reduce student attrition. Research indicates that organized music experiences are associated with greater academic success. This exploratory study examined the association between early music experiences and undergraduate nursing student success. Findings suggest that students with a music background were more likely to graduate, have higher grade point averages, and pass the licensure examination. Previous music education might be considered as an additional predictor of nursing student success. Copyright © 2013 Wolters Kluwer Health | Lippincott Williams & Wilkins.

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An Efficient Trust Propagation Scheme For Predicting Trustworthiness Of Service Providers In Service-Oriented Social Networks, Yu Xu, Jianxun Liu, Mingdong Tang, Xiaoqing Frank Liu Jan 2013

An Efficient Trust Propagation Scheme For Predicting Trustworthiness Of Service Providers In Service-Oriented Social Networks, Yu Xu, Jianxun Liu, Mingdong Tang, Xiaoqing Frank Liu

Computer Science Faculty Research & Creative Works

Perception of trustworthiness of service providers is a fundamental need in service selection. Trust propagation has been used to predict trustworthiness of service providers in service-oriented social networks. However, existing trust propagation methods may suffer from a scalability problem, i.e., their computation time is likely too high to be acceptable in practice, especially when they are applied to very large-scale service-oriented social networks. Moreover, they rarely consider the structural properties of social networks to optimize their performance. This paper proposes an efficient trust propagation scheme for predicting trust in service-oriented social networks. It exploits the specific structural properties of social …

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An Empirical Study On Symptoms Of Heavier Internet Usage Among Young Adults, Sai Preethi Vishwanathan, Levi Malott, Sriram Chellappan, P. Murali Doraiswamy Jan 2013

An Empirical Study On Symptoms Of Heavier Internet Usage Among Young Adults, Sai Preethi Vishwanathan, Levi Malott, Sriram Chellappan, P. Murali Doraiswamy

Computer Science Faculty Research & Creative Works

Understanding negative consequences of heavy Internet use on mental health is a topic that is gaining significant traction recently. A number of studies have investigated heavy Internet usage, especially among young adults in relation to online games, social media and email. While such studies do provide valuable insights, Internet usage so far has been characterized by means of self-reported surveys only that may suffer from errors and biases. In this paper, we report the findings of a two-month empirical study on heavy Internet usage among students conducted at a college campus. The novelty of the study is that it is …

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Picturing Electron Capture To The Continuum In The Transfer Ionization Of Intermediate-Energy He²⁺ Collisions With Argon, Ruitian Zhang, Xinwen Ma, Shaofeng Zhang, Xiaolong Zhu, Susmitha Akula, Don H. Madison, Bingsheng Li, Dongbin Qian, Wentian Feng, Dalong Guo, Huiping Liu, Shuncheng Yan, Pengju Zhang, Shenyue Xu, Ximeng Chen Jan 2013

Picturing Electron Capture To The Continuum In The Transfer Ionization Of Intermediate-Energy He²⁺ Collisions With Argon, Ruitian Zhang, Xinwen Ma, Shaofeng Zhang, Xiaolong Zhu, Susmitha Akula, Don H. Madison, Bingsheng Li, Dongbin Qian, Wentian Feng, Dalong Guo, Huiping Liu, Shuncheng Yan, Pengju Zhang, Shenyue Xu, Ximeng Chen

Physics Faculty Research & Creative Works

Electron emission occurring in transfer ionization for He2+ collisions with argon has been investigated using cold target recoil ion momentum spectroscopy. The double differential cross sections for electron capture to the continuum of the projectile (cusp-shaped electrons) are presented for collision energies from 17.5 to 75 keV/u. For an energy of 30 keV/u, we find a maximum in the experimental ratio of the cusp-shaped electron yield to the total electron yield. This result is explained in terms of the velocity matching between the projectile ion and the electron initially bound to the target. One of the important issues for …

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Search For Gravitational Waves From Binary Black Hole Inspiral, Merger, And Ringdown In Ligo-Virgo Data From 2009-2010, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website. Jan 2013

Search For Gravitational Waves From Binary Black Hole Inspiral, Merger, And Ringdown In Ligo-Virgo Data From 2009-2010, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.

Physics Faculty Research & Creative Works

We report a search for gravitational waves from the inspiral, merger and ringdown of binary black holes (BBH) with total mass between 25 and 100 solar masses, in data taken at the LIGO and Virgo observatories between July 7, 2009 and October 20, 2010. The maximum sensitive distance of the detectors over this period for a (20,20)M⊙ coalescence was 300 Mpc. No gravitational wave signals were found. We thus report upper limits on the astrophysical coalescence rates of BBH as a function of the component masses for nonspinning components, and also evaluate the dependence of the search sensitivity on …

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Tailoring Spin-Orbit Torque In Diluted Magnetic Semiconductors, Hang Li, Xuhui Wang, Fatih Dogan, Aurelien Manchon Jan 2013

Tailoring Spin-Orbit Torque In Diluted Magnetic Semiconductors, Hang Li, Xuhui Wang, Fatih Dogan, Aurelien Manchon

Materials Science and Engineering Faculty Research & Creative Works

We study the spin orbit torque arising from an intrinsic linear Dresselhaus spin-orbit coupling in a single layer III-V diluted magnetic semiconductor. We investigate the transport properties and spin torque using the linear response theory, and we report here: (1) a strong correlation exists between the angular dependence of the torque and the anisotropy of the Fermi surface; (2) the spin orbit torque depends nonlinearly on the exchange coupling. Our findings suggest the possibility to tailor the spin orbit torque magnitude and angular dependence by structural design.

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Scholars' Mine Annual Statistics Report For Jan. 1 2012 - Dec. 31 2012, Library And Learning Resources Dec 2012

Scholars' Mine Annual Statistics Report For Jan. 1 2012 - Dec. 31 2012, Library And Learning Resources

Scholars’ Mine Statistics

No abstract provided.

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Cross-Layer Schemes For Reducing Delay In Multihop Wireless Networks, Maggie Xiaoyan Cheng, Quanmin Ye, Lin Cai Dec 2012

Cross-Layer Schemes For Reducing Delay In Multihop Wireless Networks, Maggie Xiaoyan Cheng, Quanmin Ye, Lin Cai

Computer Science Faculty Research & Creative Works

End-to-end delay is an important QoS metric in multihop wireless networks such as sensor networks and mesh networks. End-to-end delay is defined as the total time it takes for a single packet to reach the destination. It is a result of many factors including the length of the route and the interference level along the path. in this paper we address how to minimize end-to-end delay jointly through optimizing routing and link layer scheduling. We present two cross-layer schemes, a loosely coupled cross-layer scheme and a tightly coupled cross-layer scheme. in the loosely coupled cross-layer scheme, routing is computed first …

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Study On The Start-Up Schemes For The Three-Stage Solid State Transformer Applications, Xiaohu Liu, Liming Liu, Hui Li, Keith Corzine, Tangtang Guo Dec 2012

Study On The Start-Up Schemes For The Three-Stage Solid State Transformer Applications, Xiaohu Liu, Liming Liu, Hui Li, Keith Corzine, Tangtang Guo

Electrical and Computer Engineering Faculty Research & Creative Works

This paper investigates two stage-by-stage start-up schemes for a three-stage solid state transformer (SST) that includes a high frequency transformer. the DC-DC converter transformer current dynamics analysis presented in this paper shows that the stage-by-stage start-up scheme may lead to a relatively large transformer current. as a result, the DC-DC converter would suffer a relatively large input inrush current. the pre-charge start-up scheme can improve the transformer current profile during the transient. the detailed analysis of those two-start-up scheme is presented and the experimental verification on laboratory prototype proved the analysis of stage-by-stage start-up scheme. © 2012 IEEE.

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