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Articles 31 - 60 of 1079
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Testing The Floristic Quality Assessment Index In Natural And Created Wetlands In Mississippi, Usa, Brook Danielle Herman
Testing The Floristic Quality Assessment Index In Natural And Created Wetlands In Mississippi, Usa, Brook Danielle Herman
Theses and Dissertations
The U.S. Environmental Protection Agency has mandated that states must include the use of biological assessments in their water quality laws to assess the biological integrity of aquatic systems. The Floristic Quality Assessment Index (FQAI), which uses wetland vegetation to assess the biological integrity of an ecosystem, has not been tested in Mississippi. The purpose of this study was to test the efficiency of the FQAI in wetlands along a gradient of human influence. Coefficients of conservatism (CC) were assigned to plant species based on their tolerance to disturbance and fidelity to habitat. A negative correlation was found between the …
Reliability And Validity Of Virtual Build Methodology For Ergonomics Analyses, Tinghao Wu
Reliability And Validity Of Virtual Build Methodology For Ergonomics Analyses, Tinghao Wu
Theses and Dissertations
This study was conducted to assess the validity and reliability of the Virtual Build methodology for ergonomics design and analysis. Thirty-six human subjects participated in this study and performed a set of six tasks. The tasks were performed twice in both real and virtual environment. The subject?s motion in performing tasks was analyzed by ergonomics assessments by using Virtual Build methodology. Criteria-related validity was evaluated by comparing the Virtual Build ergonomic assessment results with manual calculation. Test-retest reliability was evaluated by correlating ergonomics assessment results between two trials. The result shows that the Virtual Build methodology is reliable for ergonomic …
Screening Soybean Genotypes For High Temperature Tolerance By In Vitro Pollen Germination, Pollen Tube Length And Physiological Techniques, Mohammed A. Salem
Screening Soybean Genotypes For High Temperature Tolerance By In Vitro Pollen Germination, Pollen Tube Length And Physiological Techniques, Mohammed A. Salem
Theses and Dissertations
We are now witnessing changing environmental conditions and these changes will likely continue into the coming decades due to projected increases in temperatures on the earth surface. Recent model projections suggest that the global mean surface air temperatures will increase by 1.4 to 5.8 °C by 2100. The consequences of these high temperatures include reductions in crop yields. Soybean is one of the major crops grown in the US, where high temperatures (>35 °C) during reproductive growth decreased yield. Two experiments were conducted to determine the effects of temperature on soybean pollen germination properties and identify responses to temperature …
The Use Of Compression Precracking Constant Amplitude (Cpca) Test Method To Obtain Near-Threshold Fatigue Crack Growth Behavior In Aa7075-T7351, Dustin Henry Mcknight
The Use Of Compression Precracking Constant Amplitude (Cpca) Test Method To Obtain Near-Threshold Fatigue Crack Growth Behavior In Aa7075-T7351, Dustin Henry Mcknight
Theses and Dissertations
Traditionally, pre-cracking has been performed under tension-tension loading, followed by a load reduction scheme to obtain fatigue crack growth rate data in the near threshold regime. These data have been shown to exhibit load history effects due to remote crack closure. An alternative test method has been developed to minimize these load history effects. This test procedure uses compression pre-cracking to initiate a crack, followed by constant amplitude loading to grow the crack to failure. Compression-compression (C-C) loading as a means of forming a starter crack for fatigue crack growth is a relatively new concept. Cracks grown under C-C loading …
Work Replication: A Communication Optimization For Loci, Krunal Navinchandra Soni
Work Replication: A Communication Optimization For Loci, Krunal Navinchandra Soni
Theses and Dissertations
For distributed memory architectures, communication cost is a significant source of overhead in parallel scientific applications. Many proposed communication optimizations duplicate the behavior of well-written hand-tuned parallel code. Because of continuous changes in architectural components, these types of low-level optimizations are not always effective. This thesis seeks to develop a high-level optimization of work replication in which computations are replicated to minimize communications. There exist performance trade-offs between computation cost and communication cost because of work replication. Due to these trade-offs, it is required to determine which computations should be replicated to improve overall performance. This research presents the development …
An Adaptive Wireless Lan Mac Scheme To Achieve Maximum Throughput And Service Differentiation, Wei Zha
An Adaptive Wireless Lan Mac Scheme To Achieve Maximum Throughput And Service Differentiation, Wei Zha
Theses and Dissertations
With the explosive deployment of wireless LAN technology in the past few years and increasing demand on multimedia applications, the efficient utilization of the precious wireless radio link resources and support of Quality of Service (QoS) in WLANs has become a prominent research issue. In this thesis, an adaptive p-persistent based I 802.11 MAC scheme in WLANs has been proposed. The proposed scheme can maximize the total channel throughput, and also provide service differentiation among multiple traffic classes. This is achieved by updating the transmission probabilities for the stations that compete for transmissions in a WLAN, adaptively based on the …
The Geology And Hydrology Of The Proposed Upper Mccurtain Creek Watershed Impoundment Choctaw County, Mississippi, Leonard D (Leonard Dwight) Rawlings
The Geology And Hydrology Of The Proposed Upper Mccurtain Creek Watershed Impoundment Choctaw County, Mississippi, Leonard D (Leonard Dwight) Rawlings
Theses and Dissertations
The McCurtain Creek watershed was proposed for a large reservoir project resulting in the commissioning of this study to assess the site?s geology, hydrogeology, and surface hydrology to find whether or not the site was suitable. Data was collected from 57 geophysical logs from coal exploration boreholes to produce geologic and aquifer cross sections. A program to assess discharge identified surface hydrology characteristics of the stream at five locations. Twenty-seven geotechnical boreholes, 23 standpipe piezometers, and the data from the coal exploration were used to map the water table using ArcGIS 8.3 software. Eighteen piezometers at stream sites, used to …
Mechanical And Physical Properties Of Preservative-Treated Strandboard, John Warren Kirkpatrick
Mechanical And Physical Properties Of Preservative-Treated Strandboard, John Warren Kirkpatrick
Theses and Dissertations
The purpose of this research was to quantify properties of strandboard panels manufactured with various preservatives at loading levels effective against native termites. Panels were manufactured using nine different formulations. The method of preservative addition was also examined for some preservative formulations, increasing the total number of preservative treatments to twelve. Panels were manufactured with one target retention for each preservative treatment. An effective preservative loading relative to termites was established by previous studies or referencing current standards. Mechanical testing performed included static bending and internal bond. Physical testing included water absorption, thickness swell, and linear expansion. Few treatments met …
Combining Static Analysis And Dynamic Learning To Build Context Sensitive Models Of Program Behavior, Zhen Liu
Combining Static Analysis And Dynamic Learning To Build Context Sensitive Models Of Program Behavior, Zhen Liu
Theses and Dissertations
This dissertation describes a family of models of program behavior, the Hybrid Push Down Automata (HPDA) that can be acquired using a combination of static analysis and dynamic learning in order to take advantage of the strengths of both. Static analysis is used to acquire a base model of all behavior defined in the binary source code. Dynamic learning from audit data is used to supplement the base model to provide a model that exactly follows the definition in the executable but that includes legal behavior determined at runtime. Our model is similar to the VPStatic model proposed by Feng, …
Exploring Extensions Of Traditional Honeypot Systems And Testing The Impact On Attack Profiling, Robert Wesley Mcgrew
Exploring Extensions Of Traditional Honeypot Systems And Testing The Impact On Attack Profiling, Robert Wesley Mcgrew
Theses and Dissertations
This thesis explores possibilities for extending the features of honeypot systems to decrease the chance of an attacker discovering that they have compromised a honeypot. It is proposed that by extending the period of time that an attacker spends on a honeypot oblivious to its status, more information relevant to profiling the attacker can be gained. Honeypots are computer systems that are deployed in a way that attackers can easily compromise them. These systems, which contain no production data, are useful both as early warning systems for attacks on production systems, and for studying the tools, techniques, and motives of …
Evaluation Of Hatchery And Growout Factors For The Successful Production And Stocking Of Juvenile Gulf Coast Walleye, Justin L. Wilkens
Evaluation Of Hatchery And Growout Factors For The Successful Production And Stocking Of Juvenile Gulf Coast Walleye, Justin L. Wilkens
Theses and Dissertations
Temperature-dependent weight gain of Gulf coast and northern strain walleye Sander vitreus fingerlings was determined by rearing fish in flow-through aquaria at different water temperatures (range 15-32°C). Maximum growth of Gulf coast and northern strain walleye occurred between 20 and 26°C, and weight gain of northern walleye exceeded that of the Gulf coast strain by 1.5 times. An acclimated chronic exposure method to assess upper thermal limits determined that walleye survived 35, 9, and 1 days at 33, 34, and 35°C, respectively. A post pond-rearing feed-training practice (21 d) at a mean density of 6,290 ± 1,247 fish/m3 using formulated …
The Development Of A Methodology For Assessing Industrial Workstations Using Computer-Aided Ergonomics And Digital Human Models, Jinyan Du
Theses and Dissertations
This study examined an existing industrial workstation at an automobile assembly plant using computer aided ergonomics and digital human models. The purpose of this evaluation was the development of a methodology useful for evaluating workstations to identify potential design issues that could result in musculoskeletal injury in a real work environment. An ergonomic risk assessment was conducted on a lifting task while being performed both manually and using an assist device. JACK digital human modeling and ergonomics software were used to conduct a computer-based ergonomic analysis. Four analysis tools in JACK (static strength analysis, rapid upper limb assessment, metabolic energy …
Experimental Study On The Effects Of Operational Parameters Of A Downdraft Gasifier, Lin Wei
Experimental Study On The Effects Of Operational Parameters Of A Downdraft Gasifier, Lin Wei
Theses and Dissertations
To examine the effects of operational parameters on syn-gas quality and biouel conversion rate under various running conditions, an experimental study of hardwood chip?s gasification in a downdraft gasifier was conducted. The resulting syn-gas had average low heating value of 5.79 ± 0.52 MJ/ Nm3, tar concentration of 14.06 ± 8.54 mg/Nm³, particulate concentration of 3.05 ± 1.79 mg/Nm³, hardwood conversion rate of 2.37±0.24 Nm³/kg, and carbon conversion rate of 98.01 ± 0.53%. This syn-gas is of acceptable quality to be used as a fuel source for internal combustion engine operations. The gasifier?s grate temperature had no evident effects on …
An Investigation Of Firms' Earnings Management Practices Around Product Recalls, Zeeshan Ahmed
An Investigation Of Firms' Earnings Management Practices Around Product Recalls, Zeeshan Ahmed
Theses and Dissertations
This study investigates the earnings management practices of firms around product recalls. In recent years, the management of earnings around firm-specific events has received considerable attention in the finance and accounting literature. New equity issues, mergers and acquisitions, share repurchases, and management buyouts are some events around which at least some firms have been shown to manage their earnings to achieve managements? objectives. Product recalls offer yet another interesting occasion when managers have incentives to cover up the true financial performance of their firms and mislead investors. In order to determine whether firms announcing product recalls manage earnings more aggressively …
Definition, Analysis, And An Approach For Discrete-Event Simulation Model Interoperability, Tai-Chi Wu
Definition, Analysis, And An Approach For Discrete-Event Simulation Model Interoperability, Tai-Chi Wu
Theses and Dissertations
Even though simulation technology provides great benefits to industry, it is largely underutilized. One of the biggest barriers to utilizing simulation is the lack of interoperability between simulation models. This is especially true when simulation models that need to interact with each other span an enterprise or supply chain. These models are likely to be distributed and developed in disparate simulation application software. In order to analyze the dynamic behavior of the systems they represent, the models must interoperate. However, currently this interoperability is nearly impossible. The interaction of models also refers to the understanding of them among stakeholders in …
Adjoint-Based Error Estimation And Grid Adaptation For Functional Outputs From Cfd Simulations, Ravishankar Balasubramanian
Adjoint-Based Error Estimation And Grid Adaptation For Functional Outputs From Cfd Simulations, Ravishankar Balasubramanian
Theses and Dissertations
This study seeks to reduce the degree of uncertainty that often arises in computational fluid dynamics simulations about the computed accuracy of functional outputs. An error estimation methodology based on discrete adjoint sensitivity analysis is developed to provide a quantitative measure of the error in computed outputs. The developed procedure relates the local residual errors to the global error in output function via adjoint variables as weight functions. The three major steps in the error estimation methodology are: (1) development of adjoint sensitivity analysis capabilities; (2) development of an efficient error estimation procedure; (3) implementation of an output-based grid adaptive …
Identification And Location Of Sunken Logs Using Sidescan Sonar Technology, Aravindh Srivatsav Ravichandran
Identification And Location Of Sunken Logs Using Sidescan Sonar Technology, Aravindh Srivatsav Ravichandran
Theses and Dissertations
Identifying the location of sunken logs is a task of considerable interest in today?s world economy. The main motive of this work is to find and locate sunken cypress logs that were lost during the transit to a lumber mills. Underwater logging is possible because of the fact that many of the logs were barely affected by the decades of submersion. Cypress logs, the types of logs used in this research have a natural resistant to rotting. The other probability for the logs not being affected significantly, even staying in water for decades, is the high density of the growth …
Development Of A Supersonic Wind Tunnel Rapid Real-Time Data Acquisition And Control System, Ndubuisi Emmanuel Okoro
Development Of A Supersonic Wind Tunnel Rapid Real-Time Data Acquisition And Control System, Ndubuisi Emmanuel Okoro
Theses and Dissertations
As a part of the revitalization of the supersonic wind tunnel maintained by the Aerospace Engineering Department of Mississippi State University, a new data acquisition and control system became incumbent. Previous data acquisition and control systems used in the operation of the supersonic wind tunnel made use of now outdated hardware and functioned with two central processing units; one processor was used for recording system response, while the other monitored and controlled the tunnel. A new system is required to provide adequate rapid real-time control, along with rapid acquisition of raw tunnel feedback or response data and tunnel pressure data …
An Approach To Graph-Based Modeling Of Network Exploitations, Wei Li
An Approach To Graph-Based Modeling Of Network Exploitations, Wei Li
Theses and Dissertations
Computer security professionals and researchers are investigating proactive techniques for studying network-based attack behavior. Attack modeling is one of these research areas. In this dissertation, we address a novel attack modeling technique called an exploitation graph (e-graph) for representing attack scenarios. The key assumption in this research is that we can use exploitation graphs to represent attack scenarios, and methods involving e-graphs can be applied to provide vulnerability mitigation strategies. The modeling process consists of three primary steps. The first step is the creation of a knowledge base of vulnerability graphs (v-graphs) from known system vulnerabilities. Each v-graph shows necessary …
An Investigation Of The Performance In College Algebra Of Students Who Passed The Summer Developmental Program At Mississippi State University, Martha Hall Pratt
An Investigation Of The Performance In College Algebra Of Students Who Passed The Summer Developmental Program At Mississippi State University, Martha Hall Pratt
Theses and Dissertations
At Mississippi State University (MSU), students who do not meet full admission requirements may enroll in the Summer Developmental Program (SDP). During this ten-week summer program, students take four developmental courses to prepare them for college-level courses. MA 0003 Developmental Mathematics is the course designed to prepare these students for MA 1313 College Algebra. In addition, the Department of Mathematics and Statistics at MSU offers MA 0103 Intermediate Algebra to prepare students for MA 1313 College Algebra. The purpose of this study was to determine (a) whether there were correlations between student grades in MA 0003, MA 0103, and MA …
Approximate Methods For Solving Flowshop Problems, Pramod Jain
Approximate Methods For Solving Flowshop Problems, Pramod Jain
Theses and Dissertations
The flow shop scheduling problem is a classical combinatorial problem being studied for years. The focus of this research is to study two variants of the flow shop scheduling problem in order to minimize makespan by scheduling n jobs on m machines. A solution approach is developed for the modified flow shop problem with due dates and release times. This algorithm is an attempt to contribute to the limited literature for the problem. Another tabu search-based solution approach is developed to solve the classical flow shop scheduling problem. This meta-heuristic (called 3XTS) allows an efficient search of the neighboring solutions …
A Study On The Split Delivery Vehicle Routing Problem, Kai Liu
A Study On The Split Delivery Vehicle Routing Problem, Kai Liu
Theses and Dissertations
This dissertation examines the Split Delivery Vehicle Routing Problem (SDVRP), a relaxed version of classical capacitated vehicle routing problem (CVRP) in which the demand of any client can be split among the vehicles that visit it. We study both scenarios of the SDVRP in this dissertation. For the SDVRP with a fixed number of the vehicles, we provide a Two-Stage algorithm. This approach is a cutting-plane based exact method called Two-Stage algorithm in which the SDVRP is decomposed into two stages of clustering and routing. At the first stage, an assignment problem is solved to obtain some clusters that cover …
Critical Analysis Of Sic Sit Design And Performance Based Upon Material And Device Properties, Yunmo Sung
Critical Analysis Of Sic Sit Design And Performance Based Upon Material And Device Properties, Yunmo Sung
Theses and Dissertations
Recently, the need for high power, high frequency devices continues to grow with the increase in wireless communication, radar systems, HDTV, digital communication, and other military application of the RF spectrum. Traditionally when higher power is needed, one needs to either combine the output power of multiple devices or use vacuum tubes, which are still uncontested at very high power levels, capable of up to a few hundred kilowatts at 5 GHz [11]. But wide band gap semiconductor devices capable of competing in this application. Moreover, the static induction transistor (SIT) in silicon carbide can provide very high total power …
Design And Evaluation Of A Large Scale Aerosol Generator, Tracy Kristina Hogancamp
Design And Evaluation Of A Large Scale Aerosol Generator, Tracy Kristina Hogancamp
Theses and Dissertations
The Diagnostic Instrumentation and Analysis Laboratory (DIAL) at Mississippi State University was awarded a project to study the feasibility of measuring particulate matter downstream of a high efficiency particulate air (HEPA) filter by testing commercially available equipment used to monitor the downstream side of a HEPA filter. In order to perform the work required for this project, a test stand to accommodate a 12? x 12? x 11.5? HEPA filter with a rated flow of 250 standard cubic feet per minute (scfm) was constructed. The test stand required an aerosol generator capable of producing a mass loading rate of 30 …
3d Wavelet-Based Algorithms For The Compression Of Geoscience Data, Justin Thomas Rucker
3d Wavelet-Based Algorithms For The Compression Of Geoscience Data, Justin Thomas Rucker
Theses and Dissertations
Geoscience applications generate large datasets; thus, compression is necessary to facilitate the storage and transmission of geoscience data. One focus is on the coding of hyperspectral imagery and the prominent JPEG2000 standard. Certain aspects of the encoder, such as rate-allocation between bands and spectral decorrelation, are not covered by the JPEG2000 standard. This thesis investigates the performance of several JPEG2000 encoding strategies. Additionally, a relatively low-complexity 3D embedded wavelet-based coder, 3D-tarp, is proposed for the compression of geoscience data. 3D-tarp employs an explicit estimate of the probability of coefficient significance to drive a nonadaptive arithmetic coder, resulting in a simple …
Biomechanical And Metabolic Changes Within Rabbit Articular Cartilage Following Treatment With Radiofrequency Energy, Christopher Larry Horstman
Biomechanical And Metabolic Changes Within Rabbit Articular Cartilage Following Treatment With Radiofrequency Energy, Christopher Larry Horstman
Theses and Dissertations
The effects caused to articular cartilage by the remote use of arthroscopically-delivered RF energy to soft tissues in the joint are unknown. This investigation reported the short and long-term effects of bRF and mRF energy on the biomechanical properties and metabolic activity of articular cartilage. In addition, the effect of Cosequin® therapy was addressed. Thirty New Zealand white rabbits were randomly assigned to one of two treatment groups (Group 1 - placebo; Group 2 - Cosequin®). Histopathology, cell viability, GAG synthesis, and mechanical function of the articular cartilage were compared between groups. Data were analyzed using a mixed model ANOVA …
Development Of An Improved On-Line Voltage Stability Index Using Synchronized Phasor Measurement, Yanfeng Gong
Development Of An Improved On-Line Voltage Stability Index Using Synchronized Phasor Measurement, Yanfeng Gong
Theses and Dissertations
Recent events, such as the Northeast Blackout of 2003, have highlighted the need for accurate real-time stability assessment techniques to detect when an electric power system is on the brink of voltage collapse. While many techniques exist, most techniques are computationally demanding and cannot be used in an on-line application. A voltage stability index (VSI) can be designed to estimate the distance of the current operating point to the voltage marginally stable point during the system operation. In this research work, a new VSI was developed that not only can detect the system voltage marginally stable point but also is …
Development Of Conjugate Heat Transfer Capability To An Unstructured Flow Solver - U2ncle, Qingluan Xue
Development Of Conjugate Heat Transfer Capability To An Unstructured Flow Solver - U2ncle, Qingluan Xue
Theses and Dissertations
A precise prediction of the heat loads in metal materials in contact with the hot gas is an increasingly demanding problem in the design phase of the complex cooling schemes in the modern turbine engines. The coupled calculation of the fluid flow and the heat transfer is a promising approach as heat transfer coefficients are not necessary in the calculation and the heat transfer itself is part of the calculation and can be derived from local heat fluxes. Therefore, it is useful to incorporate an appropriate scheme for directly coupled heat transfer computations (conjugate heat transfer), capable of handling complex …
Trust Broker: A Defense Against Identity Theft From Online Transactions, Michael George Edvalson
Trust Broker: A Defense Against Identity Theft From Online Transactions, Michael George Edvalson
Theses and Dissertations
The proliferation of online services over the years has encouraged more and more people to participate in Internet activities. Many web sites request personal and sensitive information needed to deliver the desired service. Unfortunately, it is difficult to distinguish the sites that can be trusted to protect such information from those that cannot. Many attempts to make the Internet easier to use introduce new security and privacy problems. On the other hand, most attempts at creating a safe online environment produce systems that are cryptic and hard to use. The TrustBroker system is based on a specialized online repository that …
How Coming To Terms With Difficulties In The Family Of Origin Positively Influences Adult Children's Relationship/Marital Quality, Vjollca Kadi Martinson
How Coming To Terms With Difficulties In The Family Of Origin Positively Influences Adult Children's Relationship/Marital Quality, Vjollca Kadi Martinson
Theses and Dissertations
Decades of research have shown that family-of-origin experiences are generally important predictors of individuals' later relationship/marital quality. On average, the healthier these experiences are, the healthier adult children's relationships and marriages tend to be. The focus of this study was to investigate how coming to terms with difficulties experienced in the family of origin may enhance adult children's ability to create high quality relationships and marriages. The study employed a sample of 6423 U.S. couples, 18-45 years old, who were dating, cohabitating, engaged or married. This study showed that individuals in couple relationships who reported healthier family-of-origin experiences and those …