Physical Sciences and Mathematics Commons^™

Assessment Of Effectiveness Of Buffer Zones In Removing Impurities In Runoff From Areas Treated With Poultry Litter. Part Ii: Source Areas To Buffer Areas Ratio Effects, P. Srivastava, D. R. Edards, T. C. Daniel

Technical Reports

Vegetative filter strips (VFS) are known to reduce runoff losses of nutrients. solids. and other materials from land areas treated with fertilizers . Although VFS effectiveness is known to depend partially on the relative lengths of filter and pollutant source areas. there is little experimental evidence available to quantify this dependence. This is particularly the case when VFS are implemented down-slope of pasture areas treated with animal manures such as poultry litter. This study assessed the influences of pollutant source area (treated with poultry litter) and VFS lengths on VFS removal of total Kjeldahl nitrogen (TKN). ammonia nitrogen (NH3 -N …

Computer Simulation Study Of The Permeability Of Driven Polymers Through Porous Media, Grace M. Foo, Ras B. Pandey

Faculty Publications

A computer simulation model is used to study the permeability of polymer chains driven by a biased flow field through a porous medium in two dimensions. The chains are modeled by constrained self-avoiding walks, which reptate through the heterogeneous medium with a biased probability imposed by the driven field. A linear response description is used to evaluate an effective permeability. The permeability σ shows an unusual decay behavior on reducing the porosity p_s. We find that the permeability decreases on increasing the bias above a characteristic value B_c. This characteristic bias shows a logarithmic decay on …

Accessing Earth System Science Data And Applications Through High-Bandwidth Networks, R. Vetter, M. Ali, M. Daily, J. Gabrynowic, Sunil G. Narumalani, K. Nygard, W. Perrizo, P. Ram, S. Reichenbach, G. A. Seielstad, W. White

School of Computing: Faculty Publications

In this paper, we discuss gigabit network applications enabled by "Mission to Planet Earth," an international effort to monitor the Earth as a system. We describe the design of a network architecture to support applications developed as part of this program; introduce a new component, public access resource centers (PARC9s); and discuss how PARC's would facilitate access by users outside the traditional research community. We also describe how a particular class of users, agriculture users, might to Planet Earth program and delivered in a value-added form to them by a so-called AgPARC. The suggested architecture requires the deployment of high-bandwidth …

The Mandelstam-Leibbrandt Prescription In Light Cone Quantization Gauge Theories, Gary Mccartor, David G. Robertson

Physics Faculty Scholarship

Quantization of gauge theories on characteristic surfaces and in the light-cone gauge is discussed. Implementation of the Mandelstam-Leibbrandt prescription for the spurious singularity is shown to require two distinct null planes, with independent degrees of freedom initialized on each. The relation of this theory to the usual light-cone formulation of gauge field theory, using a single null plane, is described. A connection is established between this formalism and a recently given operator solution to the Schwinger model in the light-cone gauge.

Spatial Variation Of Naticid Gastropod Predation In The Eocene Of North-America, Thor A. Hansen, Patricia H. Kelley

Geology Faculty Publications

Although, the fossil record of naticid gastropod drilling has played an important role in the controversy over predator-prey evolution, little is known about variation of drilling frequencies within single horizons or how predation patterns are influenced by environmental variables. Without an understanding of spatial variation in drilling, temporal patterns in drilling are difficult to interpret. We surveyed 27,554 specimens of molluscs from the Cook Mountain interval (upper middle Eocene) and Jackson Group (late Eocene) of the U.S. Gulf and Atlantic Coastal Plain to document spatial variation in naticid drilling frequencies. The Jackson Group assemblages from the Moodys Branch and Yazoo …

Optimal Wavefront Reconstruction For A Coherent Diffracted Field, William W. Arrasmith

Theses and Dissertations

In sheared coherent beam interferometric imaging, an estimate of the average reflectivity profile of the object can be computed from measurements of point to point phase differences in the far field interference pattern and a suitable phase reconstruction technique. The phase difference information is encoded in the irradiance of three identical, shifted and superimposed speckled laser beam patterns. A minimum variance phase reconstruction technique is presented to estimate the phase of the field in the measurement plane from the phase differences and evaluate its performance. Prior knowledge of the phase covariance is used in the minimum variance reconstructor. Analytic calculations …

On The Equivalence Of Certain Consequences Of The Proper Forcing Axiom, Peter Nyikos, Leszek Piatkiwicz

Faculty Publications

No abstract provided.

Brine Shrimp Ecology In The Great Salt Lake, Utah, Wayne A. Wurtsbaugh

Watershed Sciences Faculty Publications

Hypersaline lakes are noted for their simple communities which facilitate understanding ecological interactions (Williams et al. 1990; Wurtsbaugh 1992; Jellison and Melack 1988). Nevertheless, we still cannot easily predict how environmental changes will effect the population dynamics in these lakes, at least in part because even these simple ecosystems may be more complex than we .realize. Many hypersaline lakes are dominated by the brine shrimp Artemia spp. The production of brine shrimp is often very high because the terminal, saline lakes accumulate nutrients that make them rich, and because the short food chains in them (nutrients-->phytoplankton-->brine shrimp) minim …

Finite Thermal Diffusivity At Onset Of Convection In Autocatalytic Systems: Discontinuous Fluid Density, D. A. Vasquez, Boyd F. Edwards, J. W. Wilder

All Physics Faculty Publications

A linear convective stability analysis for propagating autocatalytic reaction fronts includes density differences due to both thermal and chemical gradients. Critical parameters for the onset of convection are calculated for an unbounded geometry, a vertical slab, and a vertical cylinder. Thermal effects are important at unstable wavelengths well above the critical wavelength for the onset of convection.

Biomedical Data Interpolation For 3-D Visualization, Ming-Chung Chen

Theses and Dissertations

Medical imaging devices that produce three-dimensional data usually produce the data in the form of image slices. In such images, the resolution in z direction is lower than in x and y directions. Before extracting and displaying objects in such images, an interpolated 3-D gray-scale volume image can be generated via image interpolation techniques to fill in the missing information. The subject of this thesis is the applying three different interpolation techniques to generate intermediate slices and comparing their qualities. The three interpolation techniques are linear interpolation, cubic spline interpolation, and Fourier interpolation. We also apply the CT image matching …

Epidemiological Study Of Road Traffic Accidents, Casualties And Fatalities In The United Arab Emirates, Ahmed Saif Al-Falasi

Theses

In the United Arab Emirates (UAE), with its rapid expansion of road construction and increase in the number of vehicle, road traffic accidents are becoming a serious public health problem. It was aimed to study road traffic accidents (RTA) in view of the fact that cause a substantial waste of national resources which could be used fruitfully for the improvement of health schemes and other aspects of life in UAE. It was observed that there has been a dramatic increase in the number of registered vehicles during this period. During the ten years period 1983 to 1992, the population of …

The Prairie Naturalist Volume 27, No.2. June 1995

The Prairie Naturalist

WILDLIFE MORTALITY ASSOCIATED WITH OIL PITS IN WYOMING ▪ B.J. Esmoil and S.H. Anderson

DRAMATIC INCREASE OF LE CONTE'S SPARROW IN CONSERVATION RESERVE PROGRAM FIELDS IN THE NORTHERN GREAT PLAINS ▪ LD. Igl and D.H. Johnson

CHRISTMAS BIRD COUNTS FOR NORTH DAKOTA - 1994 ▪ R.N. Randall

DESCRIPTIONS OF WALLEYE STOCKS IN HIGH-ELEVATION RESERVOIRS, WYOMING ▪ T.D. Marwitz and W A. Hubert

NEW VASCULAR PLANT RECORDS FOR THE BLACK HILLS OF SOUTH DAKOTA AND WYOMING • G.E. Larson and J.R. Johnson

NOTES

A New Population of Small White Lady's-Slipper (Cypripedium candidum) in South Dakota ▪ S.E. Boettcher

Sandhill …

Risk And Rapa On The Internet, Thomas G. Field Jr.

RISK: Health, Safety & Environment (1990-2002)

Editorial news item announcing new email addresses and electronic formats for back issues and indexes. Details on an upcoming conference entitled Promoting and Managing Genome Innovation scheduled to be held October 13-14, 1995 are also given.

Heavy Minerals And Metals Content Of Coastal Sediments Between Dibba And Kalba, Eastern Coast (U.A.E.)., Aisha Hader Juma

Theses

The present project deals with the study of coastal sediments along the Eastern Coast of United Arab Emirates (U.A.E.), and it has two main objectives:

• Determination of heavy mineral contents of the coastal sediments in relation to the geology of the hinterlands.
• Trace metals studies (Zn, Pb, Ni, Cr, Cu, Co, Cd, Mn and organic carbon) as a measure of environmental pollution.

The results of heavy minerals separation (fine sand fraction) from the Eastern Coast sediments reflect that these sediments are generally rich in heavy minerals content with percentages reaching up to 78% with some areas reaching upto 98%. The …

Management Of Hospital Wastes In The United Arab Emirates, Hanan Ahmed Ali Shuwaiter

Theses

The gradual expansion and development of new public and private medical complexes have resulted in the production of various types of wastes which include hazardous materials. Such wastes require appropriate handling and management schemes based on safer disposal methods. There are no reliable figures for quantifying the amount of medical waste generated or appropriate legislation and guidelines for handling, storage, transport and disposal of medical waste in the United Arab Emirates. No previous detailed studies have been conducted for the management of medical waste in the UAE. In general there is insufficient awareness of the health hazard associated with improper …

John Muir Newsletter, Summer 1995, John Muir Center For Regional Studies

Muir Center Newsletters (1981-2015)

John Muir Newsletter summer 1995 university of the pacific volume 5, number 3 JOHN MUIR AND THE VAN DYKE RANCH: INTIMACY AND DESIRE IN HIS FINAL YEARS By Peter Wild (Editor's note: Well-known author, poet, biographer and nature writer, Peter Wild is Professor of Modern Language at the University of Arizona in Tucson. The following paper is an outgrowth of his recent research on the Muir family in the Southwest. Part Two will be published in the next issue.) PARTONE When occasional gunfire erupted in the town, it could be heard at the nearby desert ranch, but that didn't seem …

The Mathematics Of Measuring Capabilities Of Artificial Neural Networks, Martha A. Carter

Theses and Dissertations

Researchers rely on the mathematics of Vapnik and Chervonenkis to capture quantitatively the capabilities of specific artificial neural network (ANN) architectures. The quantifier is known as the V-C dimension, and is defined on functions or sets. Its value is the largest cardinality 1 of a set of vectors in Rd such that there is at least one set of vectors of cardinality 1 such that all dichotomies of that set into two sets can be implemented by the function or set. Stated another way, the V-C dimension of a set of functions is the largest cardinality of a set, such …

A Stochastic Theory Of Inhomogeneously Broadened Linewidths In Solids, Ulrich Zürcher

Physics Faculty Publications

We investigate spectral diffusion decay using a model for solids that consists of two-level-systems (TLSs) interacting via strain fields. For the case when the rate of TLS flips vanishes, we find algebraic decay of correlation functions of the local field. We show that properties of equilibrium fluctuations are in agreement with the hierarchical picture proposed by Basché and Moerner: TLSs far away produce fast fluctuations that are small in magnitude, and close TLSs produce large fluctuations that are less frequent.

Three Nonhomogeneous Poisson Models For The Probability Of Basaltic Volcanism: Application To The Yucca Mountain Region, Nevada, Charles B. Connor, Brittain E. Hill

School of Geosciences Faculty and Staff Publications

The distribution and timing of areal basaltic volcanism are modeled using three nonhomogeneous methods: spatio‐temporal nearest neighbor, kernel, and nearest‐neighbor kernel. These models give nonparametric estimates of spatial or spatio‐temporal recurrence rate based on the positions and ages of cinder cones and related vent structures and can account for migration and shifts in locus, volcano clustering, and development of regional vent alignments. The three methods are advantageous because (1) recurrence rate and probability maps can be made, facilitating comparison with other geological information; (2) the need to define areas or zones of volcanic activity, required in homogeneous approaches, is eliminated; …

Optimal Mixed-Norm Control Synthesis For Discrete-Time Linear Systems, David R. Jacques

Theses and Dissertations

A mixed-norm approach to control synthesis for discrete time linear systems is developed. Specifically, the problem of minimizing the H₂ norm of a transfer function, subject to a combination of ℓ₁ and-or H_∞ norm constraints on dissimilar but related transfer functions is considered. The uniqueness of the optimal solution is shown, and numerical methods for approximating the optimal solution to within arbitrary accuracy are developed. These methods generally result in high order compensators which can not be implemented in most practical applications. In response to this, a numerical method is developed which solves for suboptimal solutions of …

Physiologically-Based Pharmacokinetic Modeling Of Skin Absorption Using Dermal Subcompartments, Richard L. Bookout Jr.

Theses and Dissertations

Dermal penetration of chemicals and drugs is important to both toxicologists and pharmacologists. Drug developers try to enhance and environmental professionals try to limit penetration of chemicals through the skin. Both can use predictive biologically-based mathematical models to assist in understanding the processes involved. When these models are based on physiological and biochemical parameters which can be measured in the laboratory, they can be extremely useful. Appropriately validated models based on first principles can be predictive of human exposures when the processes involved are adequately understood. In this thesis we develop four new physiologically-based pharmacokinetic (PBPK) models to predict blood …

Current Measurements In The York River Near The Coleman Bridge, John M. Brubaker

Reports

In support of Tidewater Construction Corporation's project to widen the George P. Coleman Bridge, current measurements were conducted in the York River between Gloucester Point and Yorktown, Virginia, along both sides of the bridge. The objective was to sample the currents at approximately 10 feet below the water surface during maximum ebb and flood flow, at enough locations to resolve cross-river variations in the flow field. This objective was well satisfied with multiple surveys conducted during ebb, slack, and flood phases of the tidal flow, each survey providing current data at multiple depths. Significant cross-river variability was documented.

Hodographs And Normals Of Rational Curves And Surfaces, Thomas W. Sederberg, Takafumi Saito, Guo-Jin Wang

Faculty Publications

Derivatives and normals of rational Bézier curves and surface patches are discussed. A non-uniformly scaled hodograph of a degree m x n tensor-product rational surface, which provides correct derivative direction but not magnitude, can be written as a degree (2m - 2) x 2n or 2m x (2n - 2) vector function in polynomial Bézier form. Likewise, the scaled normal direction is degree (3m - 2) x(3n - 2). Efficient methods are developed for bounding these directions and the derivative magnitude.

Effects Of Zebra Mussel, Dreissena Polymorpha, Infestation On Lake Dardanelle Water Quality, Charles J. Gagen, Joseph N. Stoeckel

Technical Reports

Zebra mussels recently invaded southern waterways including the Arkansas River. Exponential population growth and high filtration capacity of dense populations could alter reservoir ecosystem function. Furthermore, they attach to hard surfaces; thus, threatening normal operations of many artificial structures. We designed this study to provide baseline data prior to high population levels of zebra mussels in Lake Dardanelle. The characterization of spatial and temporal variability in water quality, zooplankton, phytoplankton, and macrophytes will allow testing of several hypotheses. We sampled zebra mussel density and zooplankton at four fixed sites and the other key variables at three of these sites biweekly …

Canadian Cooperative Wildlife Health Centre Newsletter, Volume 3-2, Spring/Summer 1995

Canadian Cooperative Wildlife Health Centre: Newsletters and Publications

Budget Cuts and the Wildlife Health Centre Avian Botulism Workshop Some Common Diseases of Fresh-Water Fish Mortality of common terns in Kouchibouguac National Park Salt poisoning in White-Winged Crossbills Prevalence of Raccoon Roundworm (Baylisascaris procyonis) in Québec Massive Amphibian and Fish mortality in Mauricie after a Sulphuric Acid spill Intentional Poisoning of Snow Buntings by Carbofuran Conjunctivitis in house finches Collisions of migrating birds with office towersRaccoons Pesticide poisonings in eagles Tularemia in muskrats and beaver Lead poisoning in eagles

The Effects Of Temperature And ƑO2 On The Al-In-Hornblende Barometer, J. L. Anderson, Diane R. Smith

Geosciences Faculty Research

The Al-in-homblende barometer potentially offers a basis for estimating crystallization pressure for granitic batholiths. However, owing to the simplicity of its formulation, misuse of the barometer can occur. Many granitic intrusions are emplaced at conditions inconsistent with those of the existing experimental calibrations, including f_O2 < NNO and/or variable to high temperature. The barometer is sensitive to variations in both f_O2 and temperature: low f_O2 can cause calculated pressures to be high by a factor of two or more, and the effect of temperature is up to 2 kbar per 100 °C, depending on total Al abundance.

Batholiths emplaced at elevated temperature and portions of plutons that crystallized below …

An Interactive Graphical User Interface Generator In The Client-Server Computational Model, Chavva Sudarshan

Masters Theses & Specialist Projects

Providing a user friendly and sophisticated user interface is a time-consuming and difficult task. On the other hand, the success of a software system is directly related to the quality of the user interface that it provides. In this thesis, a technique for the development of an automatic user interface is described and implemented; that is, we provide a tool that can be used to develop user interfaces on a platform known as the X-Window System. The hallmark of this tool is its ability to aid in developing reasonably sophisticated Graphical User Interfaces (GUI) interactively in relatively short time. The …

Fast Byte Copying: A Re-Evaluation Of The Opportunities For Optimization, Jon Inouye, Jonathan Walpole, Ke Zhang

Computer Science Faculty Publications and Presentations

High-performance byte copying is important for many operating systems because it is the principle method used for transferring data between kernel and user protection domains. For example, byte copying is commonly used for transferring data from kernel buffers to user buffers during file system read and IPC recv calls and to kernel buffers from user buffers during 'Write and-send calls. Because of its impact on overall system performance, commercial operating systems tend to employ many specialized byte copy routines, each one optimized for a different circumstance.

This paper revisits the opportunities for optimizing byte copy performance by discussing a series …

The Rotations Of Maxillary Molars, Mandibular Molars, And Maxillary First Premolars In Acceptable Occlusions, G. Kristian Hansen

Loma Linda University Electronic Theses, Dissertations & Projects

The rotation of the maxillary molars is considered important in the orthodontic treatment of malocclusions. In this study a computer analysis program was developed to examine the rotations of maxillary molars, mandibular molars, and maxillary first premolars in casts of permanent dentitions with acceptable occlusions. Ninety three sets of untreated "acceptable occlusion" models from the collection of the Foundation for Orthodontic Research (FOR) were scanned on a flat bed scanner at 600 dots per inch (dpi). The images were analyzed using custom software on a computer. Measurements were made by relating maxillary first permanent molars to the midline, the archform, …

Space Closure Efficiency With Modified Ceramic Brackets : A Comparative Study, Kirk A. Specht

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this study was to determine if the rate of extraction site closure was determined by the type of ceramic bracket used. A new ceramic bracket with a metal archwire slot was compared with a conventional ceramic bracket. Twenty patients were randomly assigned the metal slot ceramic bracket and conventional ceramic to one half of their maxillary arch respectively. The distribution was even left and right.

Retraction was started and completed on an 0.016" stainless steel round continuous archwire. One hundred gram sentalloy springs provided a uniform retraction force and were reactivated every four weeks to maintain a …