Physical Sciences and Mathematics Commons^™

Photoexcitation Of A Dipole-Forbidden Resonance In Helium, B. Krassig, E. P. Kanter, S. H. Southworth, Renaud Guillemin, Oliver Hemmers, Dennis W. Lindle, R. Wehlitz, N. L. S. Martin

Environmental Studies Faculty Publications

We have observed photoexcitation of the dipole-forbidden 1s²¹S₀→2p²¹D₂ resonance in helium by measuring the nondipolar forward-backward asymmetry of photoelectron angular distributions in the 2ℓ2ℓ^′ autoionizing region. By exploiting the electric dipole-quadrupole interference in the excitation of both the 2s2p¹P₁ and 2p²¹D₂ levels, we have observed the quadrupole resonance in photoabsorption and extracted its Fano line shape parameters and the relative phase of the 1sEp and 1sEd continua. We find the quadrupole line profile index q₂ to be markedly different from theoretical expectations.

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 18, Number 8, May 2002, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

An eight page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

The Role Of Bandgap In The Secondary Electron Emission Of Small Bandgap Semiconductors: Studies Of Graphitic Carbon, Neal E. Nickles

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The question of whether the small bandgaps of semiconductors play a significant role in their secondary electron emission properties is investigated by studying evaporated graphitic amorphous carbon, which has a roughly 0.5 eV bandgap, in comparison with microcrystalline graphite, which has zero bandgap. The graphitic amorphous carbon is found to have a 30% increase in its maximum secondary electron yield over that of two microcrystalline graphite samples with comparable secondary electron yields: highly oriented pyrolytic graphite and colloidal graphite. The potentially confounding influence of the vacuum level has been isolated through the measurement of the photoelectron onset energy of the …

Probabilistic Connections In Relaxation Networks, Dan A. Ventura

Faculty Publications

This paper reports results from studying the behavior of Hopfield-type networks with probabilistic connections. As the probabilities decrease, network performance degrades. In order to compensate, two network modifications - input persistence and a new activation function - are suggested, and empirical results indicate that the modifications significantly improve network performance.

Microscopic Chaos And Gaussian Diffusion Processes, L. Y. Chew, Christopher Ting

Research Collection Lee Kong Chian School Of Business

In this paper, we construct and analyze a prototypical model of microscopic chaos. In particular, we extend the results of Beck and Shimizu to the case where the microscopic time scale r is no longer small. The upshot is that a non-Ornstein-Uhlenbeck deterministic process can generate a Gaussian diffusion process.

Studies On Salt And Heat Stresses Tolerance Of Date Palm Plants Regenerated By Tissue Culture, Khair Tuwair Said Al-Busaidi

Theses

This research was conducted during the period of 2001/2002 to determine the thermotolerance of date palm leaflets reproduced by tissue culture and compared that with the tolerance of offshoot for the same cultivar Rzaiz. Heat tolerance of these leaflets in the presence of high salt concentration was also determined. Tissue culture plantlets used in this investigation were at two stages of acclimatization, namely VP2 and VP3 (vitro plants under acclimation program for about 4 to 6 months and 10 months, respectively). Rzaiz offshoots attached to the mother plants were about 4 years old. The electrolyte leakage procedure was used to …

Effect Of Environmental Heat Stress On Embryonic Bone Development, Noura Musaed Al-Menhali

Theses

Birth defects are anatomical abnormalities present at birth. The causes of birth defects are genetic, environmental and multifactorial inheritance factors. The main objective of the thesis is to determine the effects of maternal heat stress during rat pregnancy on fetal axial skeletal development and to explore some of the possible maternal and placental responses to heat stress.

Experiment one: A group of 40 Wistar pregnant rats were randomly assigned to two treatment groups, a control group (non-stressed, n = 10) heat at 21°C and a heat-stressed group kept at 41 °C (n = 30) for one hour on day 9 …

The Improvement Of Some Natural Organic Fertilizers Using Beneficial Microorganisms, Mariam Naseeb Al Hameeri

Theses

The random uses of inorganic fertilizers in the UAE farms generate a serious threat about polluting the soil, and the environment. This motivates some researchers to find suitable alternatives, which can give a better crop yield, and at the same time become friendly to the environment.

The present study was performed to find environmentally friendly biological fertilizers to substitute or reduce the application of inorganic fertilizers. Actinomycetes, which are known to produce plant growth regulators (PGRs) were isolated from UAE soils. A total of fifty-seven actinomycetes were isolated from a cucumber rhizosphere soil at a farm in AI-Ain city. Out …

Msf Desalination: Modeling, Simulation, And Economic Study, Abdallah S. Al-Mazroui

Theses

Some data was collected and reported for seawater desalination in the gulf region. Some information is also given regarding the multi–stage flash (MSF) desalination plants in the United Arab Emirates. The total installed capacity of these plants is 518 MIG. It was revealed that the water demand in the Abu Dhabi Emirate alone has increased by 30 folds during the last 25 years.

A literature survey was conducted mainly on modeling and simulation of MSF desalination processes. A number of commercial software such as Speedup, Camel, and EvapoLund were reviewed with special emphasis on EvapoLund that has been used as …

Enhancement Of Bioavailability And Determination Of Some Fluoroquinolones Antibiotics; Application To U A E Market, Moza Rashed Sultan Al-Zaabi

Theses

Chapter 1 of this thesis includes the importance of fluoroquinolones as one of the most impressive antibacterial drugs. Also, a complete picture about the selective molecules named cyclodextrins (CDs) is drawn. Such molecules are able to form inclusion complexes with a wide variety of lipophilic drugs. That is why CDs act as drug carriers through an aqueous media to the lipophilic cell membrane and delivers them to cells. Which results in enhancing the bioavailability of drugs with low aqueous solubility. Moreover, an explanation of the DNA/drug interactions is proposed. These are extremely useful in understanding the DNA sequence recognition by …

Effect Of Feeding Date Pits On Repartitioning Of Nutrients And Fertility In Rats., Ayesha Salem Al - Dhaheri

Theses

Five isonitrogenous (23% CP) and isocaloric (2.8 Mcal/kg) diets were prepared and used in this study; two control diets (diet 1, no date pits; diet 2, no date pits + 300 mg/kg vitamin E) and three diets containing date pits (diet 3, 12.5% date pits (DP); diet 4, 12.5% DP + 300 mg/kg vitamin E; and diet 5, 25% DP). Ninety mature Wistar rats (45 females and 45 males) were used in this experiment. All animals were provided with feed and water on an ad libitum basis for 29 consecutive days. Water and feed intake were measured daily Body weights …

Modeling And Assessment Of Environmental Capacity, Dubai Coastal Region, United Arab Emirates, Mohammad Abdul Rahman Hassan Deshgooni

Theses

The area investigated covers Dubai Creek in the Arabian Gulf Ten stations

Were elected for the tidy, covering the maximum fragments of the Creek. The

Assessment of environmental capacity indicated the presence of at least two

Distinct e regions along the Creek. The area located between Stations 1-3 is the

Downstream region; while the area laying between Stations 4-10 is the upstream

Region Water samples were analyzed for physico-chemical parameters (Water

Temperature, pH, salinity, Dissolved Oxygen, and Turbidity); and nutrients (Total

Nitrogen, Nitrate -nitrogen and Phosphate-phosphorus). Whereas the surface

Sediments were analyzed for: Moisture Content, Organic Carbon, and Texture

analyses; …

Results Of The City Of Tampa Surface Water Compliance Monitoring Program For The Year 2001 And Examination Of Long-Term Water Quality And Biological Indicator Trends In Hillsborough Bay, City Of Tampa Department Of Sanitary Sewers

Reports

This report is submitted to Florida Department of Environmental Regulation (FDER) to satisfy the requirements set forth in specific condition No. 10 of Howard F. Curren WWTP permit FL0020940-001-DW1P. The report is based on data obtained by the City of Tampa (COT) surface water compliance monitoring program approved on August 14, 2000 by the FDEP. The report also includes examination of long-term trends for water quality parameters and biological indicators collected by the City of Tampa Bay Study Group and the Environmental Protection Commission of Hillsborough County (EPC).

Report To Congress: Operations Of Glen Canyon Dan Pursuant To The Grand Canyon Protection Act Of 1992, Water Years 1999-2001, Secretary Of The Interior

All U.S. Government Documents (Utah Regional Depository)

Section 1804(c)(2) of the Grand Canyon Protection Act (GCPA) of 1992 requires the Secretary of the Interior (Secretary) to: . . . transmit to the Congress and to the Governors of the Colorado River Basin States a report, separate from and in addition to the report specified in section 602(b) of the Colorado River Basin Project Act of 1968, on the preceding year and the projected year operations undertaken pursuant to this Act. This report responds to the above-cited reporting requirements. The report focuses on Glen Canyon Dam operations for water years 1999 through 2001, projected dam operations for water …

Simulation And Economic Study Of The Med-Tvc Units At Umm Al Nar Desalination Plant, Shaikh Omar Al-Habshi

Theses

A rigorous mathematical model has been used to develop a steady state simulation program MEDNAR to analyze the multi-effect thermal vapor compression desalination (MED-TVC) plant at Umm Al-Nar power and desalination plant. The effect of thermodynamic losses on the thermal performance ratio, the specific heat transfer area and the specific flow rate of the cooling water are taken into account. The losses contemplated are the boiling point elevation and the temperature depression corresponding to the pressure drop during the vapor condensation process. The MEDNAR also takes into consideration the variation in the physical properties of the seawater with temperature and …

The Relationship Between Magnetic Interactions And Near Neighbor Interatomic Distances In The Transition Metal Sublattice Of R(Mn/Fe)₆A₆(R=Nd Or Sm, A=Ge Or Sn), G. K. Marasinghe, J. Han, William Joseph James, William B. Yelon, Naushad Ali

Chemistry Faculty Research & Creative Works

The magnetic and crystallographic structures of R(Fe/Mn)₆A₆ (R=Nd or Sm and A = Ge or Sn) intermetallics have been investigated using x-ray and neutron diffraction techniques and superconducting quantum interference device magnetic measurements. For both stannides (A = Sn) and germanides (A = Ge), the lattice contracts with increasing iron content. In the case of the stannides, substitution of manganese by iron enhances the saturation magnetization and Curie temperature at low iron concentrations (x ≤2 ) suggesting the presence of an extremely rare occurrence, positive coupling between iron and manganese magnetic moments. In contrast, the magnetic properties …

Bioavailability/Toxicity Of Iron From Aerobically Processed Organic Fertilizer, Stacey Marie Wilson

Undergraduate Honors Capstone Projects

For an undergraduate Honor's project, I worked under the direction of Dr. Jeffery Hall to determine the bioavailability and toxicity of iron from Milorganite® fertilizer, an aerobically processed organic fertilizer. The Milorganite® Company is a subsidiary of the Milwaukee Municipal Sewage District and produces a fertilizer of high iron content (approximately 5-7%). The high iron content has resulted in concern about the toxic potential, which until now was unknown. This thesis paper will explain iron chemistry, bioavailability, requirements, absorption, toxicity, and treatments, followed by a description of fertilizer types and contents. This will be followed by a description and reasoning …

Saturation Of Charge Carrier Velocity With Increasing Electric Fields: Theoretical Investigations For Pure Organic Crystals, Vasudev M. Kenkre, Paul Ernest Parris

Physics Faculty Research & Creative Works

Should one expect injected charge carrier velocities to saturate as the applied electric field is increased simply because of the nonparabolicity of bands? Does the apparent saturation observed in recent experiments in hydrocarbon crystals signify, as supposed in some current interpretations of the data, that the carrier motion is coherent or bandlike and that the disappearance of the saturation at higher temperatures is indicative of a crossover from coherent to incoherent motion? These questions are addressed with the help of general theoretical investigations involving Drude-like considerations, quantum kinetic equations, and a Fokker-Planck analysis.

Reproduction In Captive Wild-Caught Coyotes (Canis Latrans), Jeffrey S. Green, Frederick F. Knowlton, William C. Pitt

United States Department of Agriculture Wildlife Services: Staff Publications

We assessed reproductive patterns of coyotes (Canis latrans) from a 12-year data set involving 24 pairs of captive animals acquired from Latah County, Idaho. None of the females had placental scars (fetal implantation sites) at 1 year of age, but over 80% had placental scars by 2 years of age. The fraction with placental scars remained at 80–90% through age 9 years and then declined to ,40% by age 12 years. Similarly, mean number of placental scars per female rose rapidly through 2–3 years of age, remained stable until age 8 years, and then progressively declined to a …

The Impact Of Air Quality On The Selection Of A Home, Carol Lane

UNLV Theses, Dissertations, Professional Papers, and Capstones

Hedonic price method studies have assumed that individuals consider air quality as a characteristic of their homes. The purpose of this study is to determine if air quality is a significant characteristic considered when an individual decides where to live. This study uses a survey to determine where air quality ranks amongst the different characteristics of a home. My results show that air quality is significant but ranks below structural and neighborhood characteristics.

Search For Single-Top-Quark Production In Pp̅ Collisions At √S =1.8 Tev, Darin Acosta, Kenneth A. Bloom, Collider Detector At Fermilab Collaboration

Kenneth Bloom Publications

We search for standard model single-top-quark production in the W-gluon fusion and W* channels using 106 pb^-1 of data from pp̅ collisions at √s =1.8 TeV collected with the Collider Detector at Fermilab. We set an upper limit at 95% confidence level (C.L.) on the combined W-gluon fusion and W* single-top cross section of 14 pb, roughly six times larger than the standard model prediction. Separate 95% C.L. upper limits in the W-gluon fusion and W* channels are also determined and are found to be 13 and 18 pb, respectively.

Effect Of Kraft Pulping On Oxygen Delignification, Haixuan Zou

Electronic Theses and Dissertations

The objective of the study reported here was to investigate experimentally the effect of the major Kraft pulping variables on the response of brownstock pulps to medium consistency oxygen delignification. Kraft pulping was performed on mixed Northeastern hardwood chips in a laboratory rocking digester. Kraft pulps of kappa number 16 and 20 mL KMnO₄ were produced by pulping under a variety of conditions. The effective alkali (EA) charged to the digester was varied over the range of 12 to 21% while the sodium sulfide content of the pulping liquor was varied between 0 to 30% sulfidity. Cooking temperatures of …

Optimal Control Problems In Pde And Ode Systems, Hem Raj Joshi

Doctoral Dissertations

This dissertation contains three separate optimal control problems involving partial differential equations (PDEs) or ordinary differential equations (ODEs). In each problem, an objective functional representing the goal of the control process is minimized. First, a system of ordinary differential equations which describe the interaction of Human Immunodeficiency Virus (HIV) and CD4+T-cells in the human immune system is studied. Two controls representing drug treatment strategies of this model are explored. Existence and uniqueness results for the optimal control pair are established. The optimality system is derived and then solved numerically using an iterative method with the Runge-Kutta fourth order scheme.

Second, …

Third Order Opial Inequalities, Brandi Michelle Gierhart

Masters Theses

The purpose of the thesis was to find extremals y and constants K for a basic problem and for several variations of the problem. The basic problem was the third order opial inequality. We proved the existence of an extremal of this problem and other related problems. We conjectured that the extremal was a quintic spline with at most one knot, then found the quintic splines and constants for the basic problem and several variations. Maple was an important tool in finding these extremals and constants due to the complexity of the equations. We also proved that these extremals can …

Single-Molecule Detection, Wesley Carlton Parker

Masters Theses

Single-molecule detection (SMD) provides a practical method of examining the behavior of individual molecules. This has application both for fundamental studies of particle dynamics such as diffusion in solutions, and for bio-technology applications such as DNA sequencing.

In this thesis I discuss two confocal epi-illumination microscopes constructed at UTSI and used for single-molecule detection and fluorescence correlation spectroscopy. Examples of data collected from experiments using each instrument is presented in which solutions of the fluorescent dye sulforhodamine 101 are analyzed. An example of the use of the instrument to detect fluorescence quenching is also presented.

On A Grid-Based Interface To A Special-Purpose Hardware Cluster, Jeanne Marie Lehrter

Masters Theses

Grid computing is an important and useful tool that enables resource sharing within a computational community. In the grid computing model, each node of the grid is a computational resource that may be used by applications residing on other nodes of the grid or on machines outside of the grid. To make grid computing more accessible to all users, the Innovative Computing Lab on campus at the University of Tennessee has produced a software package called NetSolve. NetSolve is a client-server application that defines interfaces for accessing and utilizing the software and hardware resources of the nodes in the grid …

Defining The Hayesville–Soque River And Allatoona Faults And An Ordovician Arc Assemblage Within The Central Blue Ridge Northwest Of Dahlonega, Georgia, David Jonathan Settles

Masters Theses

The goal of this research within the central Blue Ridge northwest of Dahlonega, Georgia, is to provide new information toward better understanding of the Allatoona(?)/ Hayesville/Gossan Lead fault and terrane boundary, and to provide convincing evidence of Ordovician arc-related igneous activity. The Hayesville-Soque River and Allatoona faults separate three distinct tectonostratigraphic assemblages in this area: the Coweeta Group, Great Smoky Group, and Dahlonega gold belt. The gold belt here contains metasandstone, pelitic schist, and mafic rocks of the Otto Formation and the Sally Free mafic complex, while the Great Smoky Group contains metasandstone and pelitic schist with abundant calc-silicate. The …

Stratigraphy And Paleoecology Of The Morrison Formation, Como Bluff, Wyoming, Melissa V. Connely

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Morrison Formation at Como Bluff, Wyoming, has been historically known for containing a rich source of Late Jurassic vertebrate fossils. However, when collected, most of these fossils were not positioned into a stratigraphic or sedimentologic framework. Research shows that the Morrison Formation at Como Bluff can be divided into three members. These members can be identified by lithologic and paleontological characteristics. The lower Morrison members include the Windy Hill Member and the recently described Lake Como Member. The Windy Hill Member primarily contains near-shore marine sandstone. Megavertebrate fauna is lacking. The Lake Como Member contains illitic clay in red …

Tournament Matrices An Overview, Russel O. Carlson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The results of a round robin tournament can be represented as a matrix of zeros and ones, by ordering the players and placing a one in the (i,j) position if player i beat player j, and zeros otherwise. These matrices, called tournament matrices, can be represented by graphs, called tournament graphs. They have been the subject of much research and study, yet there have been few attempts to give a wide exposition on the subject. Those that have been done tend to focus on the graph theoretical aspects of tournaments. S. Ree and Y. Koh did write a brief …

Geometric And Radiometric Correction Of Multibeam Backscatter Derived From Reson 8101 Systems, Jonathan Beaudoin, J.E. Hughes Clarke, Edward J. Van Den Ameele, James V. Gardner

Center for Coastal and Ocean Mapping

A common by-product of multibeam surveys is a measure of the backscattered acoustic intensity from the seafloor. These data are of immense interest to geologists and geoscientists since maps of the acoustic backscatter strength can be used to infer physical properties of the sea bottom, such as impedance, roughness and volume inhomogeneity. Before such maps can be created from multibeam acoustic backscatter data, however, two tasks must be performed.

1. The data must be geographically registered using the bathymetric profile collected by the multibeam (which accounts for full orientation and refraction), as opposed to using the traditional flat-seafloor assumption. This …