Digital Commons Network^™

Development Of Intermediate And High Strain Rate Experimentation And Material Modeling Of Viscoplastic Metals, Wilburn Ray Whittington

Theses and Dissertations

This work presents a combined theoretical-experimental study of strain rate behavior in metals. The method is to experimentally calibrate and validate an Internal State Variable (ISV) constitutive model with a wide range of strain rate sensitivity. Therefore a practical apparatus and methodology for performing highly sought-after intermediate strain rate experimentation was created. For the first time in reported literature, the structure-property relations of Rolled Homogeneous Armor is quantified at the microscale and modeled with varying strain rates, temperatures, and stress states to capture plasticity and damage with a single set of constants that includes intermediate strain rates. A rolled homogeneous …

Doppler Tracking, Christopher Jacob Thomas

Theses and Dissertations

This study addresses the development of a methodology using the Doppler Effect for high-resolution, short-range tracking of small projectiles and vehicles. Minimal impact on the design of the moving object is achieved by incorporating only a transmitter in it and using ground stations for all other components. This is particularly useful for tracking objects such as sports balls that have configurations and materials that are not conducive to housing onboard instrumentation. The methodology developed here uses four or more receivers to monitor a constant frequency signal emitted by the object. Efficient and accurate schemes for filtering the raw signals, determining …

Towards A Genome Sequence Of The Brown Spot Needle Blight Pathogen (Mycosphaerella Dearnessii) Infecting Longleaf Pine, Benjamin Douglas Bartlett

Theses and Dissertations

A major disease damaging seedlings of Pinus palustris is caused by the fungus Mycosphaerella dearnessii. Population structure of this pathogen was studied in a population in Mississippi. High genetic diversity (0.65) was measured using microsatellite markers and coincides with the high number of vegetative compatibly groups observed. A 30 Mb genome sequence for a single isolate of M. dearnessii was assembled, representing 65% of the estimated genome size. Nearly all (93%) of the core set of genes present in eukaryotes were detected from a total of 10,996 predicted genes. A total of 853 enzymatic associations were identified along with several …

Impact Of Irrigation Applications At Soil Moisture Deficits On Plant Development And Yield Of Indeterminate And Determinate Soybean Varieties, Andy J. Brown

Theses and Dissertations

As the Mississippi River Alluvial Aquifer declines, it is the duty of soybean producers to become more efficient irrigators. Research was established in 2012 and 2013 in the Mississippi Delta to evaluate plant development and yield of an indeterminate soybean variety with irrigation initiated at the R1 producer standard and compared to initiation timings at the R2, R4, and R5 growth stages once a 2” deficit was reached according to the FAO-56 Penman-Monteith model. Research was also conducted to evaluate seeding rates in irrigated and non-irrigated systems in Starkville and Stoneville, MS in 2013 and 2014. These data indicate that …

Interactive Whiteboards And Tpack For Technology-Enhanced Learning: Secondary Mathematics Teachers Barriers, Beliefs, And Support Needs In One Rural School District, Shelita Mccadney Brown

Theses and Dissertations

Low-income students and blacks make up nearly half of public school students, and on nearly every indicator of educational access, particularly technology, these students have less access than white affluent students (Darling-Hammond, Zielezinski, and Goldman, 2014). The National Center for Education Statistics (2005) reported that teacher quality and missed opportunities to learn accounted for 93% of African Americans, and 87% of Hispanics performing below proficiency in mathematics. Students that do not master mathematics standards by the end of compulsory education are less likely to complete general mathematics courses in upper secondary school and beyond successfully (Levpušček, Zupančič, & Sočan, 2013). …

Promoting The Interest Of African American Teenage Girls In Science: What Can We Learn From An Exemplary African American Science Teacher?, Cynthia Stewart Mcmath

Theses and Dissertations

This study focused on science teaching that promoted the interest of African American teenage girls in the science classroom of an exemplary African American science teacher. It focused on, observed and examined the planning, teaching and learning strategies used by the science teacher. It also described what the science teacher experienced during her high school years, during college, during her teaching career. The case study approach/method was used for this research to capture the description and examination of the practices of the science teacher. This research described how an African American female science teacher serves as a role model and …

A Mixed-Integer Programming Approach For Jammer Placement Problems For Flow-Jamming Attacks On Wireless Communication Networks, Satish Vadlamani

Theses and Dissertations

In this dissertation, we study an important problem of security in wireless networks. We study different attacks and defense strategies in general and more specifically jamming attacks. We begin the dissertation by providing a tutorial introducing the operations research community to the various types of attacks and defense strategies in wireless networks. In this tutorial, we give examples of mathematical programming models to model jamming attacks and defense against jamming attacks in wireless networks. Later we provide a comprehensive taxonomic classification of the various types of jamming attacks and defense against jamming attacks. The classification scheme will provide a one …

An Experimental Investigation Of Crank-Resolved Exhaust Pressure Profiles In A Single Cylinder Research Engine With Emphasis On The Potential Of Harvesting Exhaust Energy, Taylor C. Bohach

Theses and Dissertations

The experiments detailed in this thesis give necessary preliminary information for analyzing the theoretical potential of direct exhaust pulse energy harvesting through expander devices. A detailed review of pertinent literature determined that there has been little specific focus on directly converting exhaust pulse energy into useful power. Crank position resolved exhaust pressure was measured as engine load and speed were varied to quantify their influences. Potential theoretical improvements average a 15.6% increase in overall fuel conversion efficiencies while indicated power can potentially be increased by an average of 14.3% for the operating conditions tested. A potential increase of up to …

The Keetch-Byram Drought Index And The Geographical Variability In Wildfire Size And Frequency In Eight Natural Areas Of The United States, Michael Tobit Gray

Theses and Dissertations

A continental-scale study of historic wildfire data within and across ecoregion provinces was conducted and geographical gradients in seasonal measures of wildfire size and frequency were observed. In the conterminous United States, western ecoregion provinces show north-south gradients in duration of season (short-to-long) and peak of season (early-to-late). Across the continent a gradient of unimodal to bimodal seasonal distributions of wildfire size and frequency was shown: western ecoregions have a single summer fire season and eastern regions have spring and late-summer fire seasons separated by an intervening dip in wildfire activity. From the ecoregion provinces with the highest wildfire frequency, …

Investigations At Kinlock (22su526), A Freshwater Mussel Shell Ring In The Delta Region Of Mississippi, James Bradley Carlock

Theses and Dissertations

Kinlock is a freshwater mussel shell ring site located in Sunflower County in the Mississippi Delta. Little work has been done at freshwater mussel shell rings, and therefore little is known about them. This thesis uses four different data collection methods to answer questions of chronology, site layout, etc. These four methods are controlled surface collection, excavation, coring, and magnetometry. Based on the results of these methods, Kinlock was found to be a Woodland period mussel shell ring with a later Mississippian period component built on top of the shell. This later component consisted of five mounds situated around a …

Rational Bernoulli Functions For Solving Problems On Unbounded Domains, Velinda Remona Calvert

Theses and Dissertations

In this dissertation, a new numerical method for solving some problems on the semiinfinite domain is presented. The method is based upon the modified rational Bernoulli functions. These functions are first introduced. Operational matrices of derivative and product of modified rational Bernoulli functions are then derived and are utilized to reduce the solution of the equations to a system of algebraic equations. This method is used to solve the following problems: Lane-Emden type equations, Volterra’s population model, Blasius equation, and MHD Falkner-Skan equation. Illustrative examples are included to demonstrate the validity and applicability of the technique.

Spatial Pattern Analysis Of Agricultural Soil Properties Using Gis, Corrin Jared Mccarn

Theses and Dissertations

Agricultural soil properties exhibit variation over field plot scales that can ultimately effect the yield. This study performs multiple spatial pattern analyses in order to design spatially dependent regression models to better understand the interaction between these soil properties. The Cation Exchange Capacity (CEC) and Calcium-Magnesium Ratio (CaMgR) are analyzed with respect to Calcium, Magnesium, and soil moisture values. The CEC and CaMgR are then used to determine impact on the yield values present for the field. Results of this study show a significant measure of model parsimony (0.979) for the Geographically Weighted Regression (GWR) model of the CEC with …

Examination Of The Effects Of Vitamin D Supplementation On The In Vitro Calcification Of Vascular Smooth Muscle Cells, Kevin Andrew Bennett

Theses and Dissertations

Medial calcification refers to mineral deposition in the middle layer of arteries. This mineralization is common in chronic kidney disease patients and causes an increased chance of cardiovascular complications. Calcitriol, the active form of vitamin D, is often administered to these patients to treat an associated condition, secondary hyperparathyroidism. Unfortunately, calcitriol treatment may promote vascular calcification due to increasing serum calcium and phosphate. We examined the effects of calcitriol supplementation on vascular smooth muscle cell (VSMC) calcification, through atomic absorption, scanning electron microscopy, and western blot analysis. Additionally, we examined the effects of the combinations of calcitriol, fibroblast growth factor …

Feed Quality Effects On Modern Heavy Broiler Performance, Robert Benjamin Sellers

Theses and Dissertations

Commercial broilers are fed exclusively pelleted diets; this is due to research that has demonstrated numerous benefits to feeding pellets. The first objective was to investigate the effects of modest improvements in pellet quality on two modern broiler strains. Regardless of strain, feeding 80% pellets improved broiler performance from d 28 to 42. The second objective was to investigate the effects of feed form and liquid application method on feed augering segregation and subsequent broiler performance. In general, percent pellets steadily decreased across location throughout feed augering. Also, phytase segregation occurred throughout augering and was exacerbated in post-pellet liquid application …

Partnership Launched To Increase International Recruitment At Uab, Jim Bakken

Browse All News

No abstract provided.

Meeting Minutes, Wku University Senate

Faculty Senate

Meeting regarding budget, student evaluation of faculty, Confucius Institute, add/drop policy, India Project, SACS review, Student Government Association, curriculum committee, Colonnade Plan, open records and summer/winter compensation.

A Powerful New Light Source For Ultraviolet Detection Of Scorpions In The Field, Graeme Lowe, Steven R. Kutcher, Doug Edwards

Euscorpius

We describe a new portable solid-state ultraviolet (UV) light that should greatly improve the ease and effectiveness of fluorescent detection of scorpions in the field. The design is based on an array of InGaN light emitting diodes (LEDs). It is in-expensive, lightweight, simple to implement, energetically efficient and mechanically rugged. Scorpion cuticular fluorescence excited by an LED array is 13-fold brighter than excitation by previously available fluorescent tube lamps drawing the same current from the battery.

Contents

Journal of Pre-College Engineering Education Research (J-PEER)

Contents.

Automated Theorem Proving By Translation To Description Logic, Negin Arhami

Open Access Dissertations

Many Automated Theorem Proving (ATP) systems for different logical forms, and translators for translating different logical forms from one to another, have been developed and are now available. Some logical forms are more expressive than others, and it is easier to express problems in those logical forms. On the other hand, the ATP systems for less expressive forms have benefited from more years of development and testing. There is a trade-off between the expressivity of a logical form, and the capabilities of the available ATP systems. Different ATP systems and translators can be combined to solve a problem expressed in …

Study Of The Role Of Circulating Tumor Cells (Ctc) And Circulating Cellular Microenvironment Components In Metastasis Formation And Their Clinical Value, Zheng Ao

Open Access Dissertations

Circulating Tumor Cells (CTC) are tumor cells found in cancer patients’ peripheral blood. They hold significant clinical value for cancer prognosis and management. While enumeration of CTC has been proven to provide reliable prognosis value for cancer management, further molecular and functional characterization of CTC may provide insights into both the biology of metastasis and critical clinical information such as the dynamic changes in molecular expression of tumor cells during treatment. Here, we will discuss how molecular and functional characterization of CTC can be utilized for such clinical applications, and the methodology development for such applications including a thermo-responsive release …

College Senate Minutes December 10, 2015, Bronx Community College Senate

BCC Governance Archives

Minutes for the meeting of the College Senate on December 10, 2015.

Online Sexual Activity Experiences Among College Students: A Four-Country Comparison, Nicola Döring, Kristian Daneback, Krystelle Shaughnessy, Christian Grov, E. Sandra Byers

Publications and Research

The purpose of this study was to compare male and female college students in four countries (Canada, Germany, Sweden, and the U.S.) on their lifetime experiences (prevalence) and frequency of recent experiences with six types of online sexual activities (OSA): sexual information, sexual entertainment, sexual contacts, sexual minority communities, sexual products, and sex work. Participants (N = 2690; M age, 24.65 years; 53.4 % women, 46.6 % men) were recruited from a university in each of the countries to complete an online survey that included background and demographic questions, and questions about OSA. Most participants reported experience with accessing …

Rn-Bsn Program: On-Demand, Online, Competency-Based Modules, Ladonna Michelle Mcclave

Morehead State Theses and Dissertations

A capstone submitted in partial fulfillment of the requirements for the degree of Doctor of Education in the College of Education at Morehead State University by Ladonna Michelle McClave on December 10, 2015.

December 10, 2015, James Madison University

The Breeze, 2010-2019

The Breeze is the student newspaper of James Madison University in Harrisonburg, Virginia.

V. 83, Iss. 10, December 10, 2015

Archway (1946-2020)

No abstract provided.

Lanthorn, Vol. 50, No. 30, December 10, 2015, Grand Valley State University

Volume 50, July 13, 2015 - June 6, 2016

Lanthorn is Grand Valley State's student newspaper, published from 1968 to the present.

The Minutes Of The Marshall University Faculty Senate Meeting, December 10, 2015, Marshall University Faculty Senate

Faculty Senate Minutes

No abstract provided.

Usu Engineering Study Wins Support From American Heart Association | College Of Engineering, Usu College Of Engineering

College of Engineering News

Dec. 10, 2015 – The American Heart Association is supporting a new study at Utah State University where researchers are developing a technology that may help the human body better protect itself against cardiovascular disease.

Associate Professor of Biological Engineering Jixun Zhan is the chief scientist behind the new study. He and his team are using bacteria to synthesize some of the naturally-occurring compounds found in plants that our bodies already use to combat heart disease.

Horizon, Office Of Arts + Cultural Programming, Peak Performances At Montclair State University

2015-2016 Art Between Real and Imagined

Horizon is a new work for seven dancers centered around the idea of density. In this piece I endeavored to add as much as possible to the space in terms of dancers and movement. With multiple phrases occurring simultaneously, the dance takes the form of a constantly shifting universe full of activity. glacier, my preceding work was an exercise of stripping away in an effort to reduce movement to its least possible form. Working again with collaborators Michael Schumacher and set and lighting designer Robert Wierzel, we’ve done something different. Michael’s multiple rhythms and use of a live percussionist propel …

Alum Puts Gis Degree To Work At Civil Engineering Firm, Ohio University College Of Arts & Sciences

All Forum Articles

No abstract provided.