Physical Sciences and Mathematics Commons^™

Three-Component Model And Tricritical Points: A Renormalization-Group Study., Miron Kaufman, Robert B. Griffiths, Julia M. Yeomans, Michael E. Fisher

Miron Kaufman

The global phase diagram for a three-component lattice gas or spin-one Ising model with general single-site and nearest-neighbor "ferromagnetic" interactions is worked out for twodimensional lattices using a Migdal-Kadanoff recursion relation. It differs in important qualitative respects from the corresponding mean-field phase diagram. The set of fixed points and flows provides the characteristic'phase diagrams of the three-state Potts multicritical point and the ordinary (n =1) tricritical point in a complete set of symmetry-breaking fields. The latter is associated, in this renormalization-group scheme, with seven distinct critical fixed points, a number which is surprisingly large.

Pmva - Purdue Mean Value Analysis Program User's Guide, Jeff Brumfield

Department of Computer Science Technical Reports

No abstract provided.

Monthly Planet, 1981, April, Mark Gardner, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Mouthpart Morphology And Feeding Strategies Of The Commensal Amphipod, Anamixis Hanseni Stebbing, James Darwin Thomas, George W. Taylor

Marine & Environmental Sciences Faculty Articles

The lack of the information on the biology of the commensal amphipod family Anamixidae prompted investigations into mouthpart ultrastructure, feeding biology, and host specificity of Anamixis hanseni Stebbing, 1897. Earlier investigators presented conflicting reports on the structural composition of the buccal region and feeding modes in anamixids. Scanning electron microscope analysis of A. hanseni showed a complete set of mouthparts to be present, although much modified and reduced, except for the well-developed maxilliped palps. Feeding is not parasitic (piercing and sucking host tissue) as previously believed but is accomplished while A. hanseni rests inside its host. Minute food particles are …

University-School Cooperation, Herman Feshbach, Robert Fuller

Robert G. Fuller Publications

We have a growing concern with the deterioration in both the quality and quantity of secondary physics education in the US. These concerns have recently been addressed by an APS panel chaired by Gertrude S. Goldhaber.

Rare-Earth-Rich Metallic Glasses. Ii. Magnetic Viscosity, George C. Hadjipanayis, David J. Sellmyer

David Sellmyer Publications

Magnetic viscosity measurements on amorphous Tb₇₅Au₂₅ and (Er₆₅Fe₃₅)₉₀B₁₀ alloys are presented in the temperature range of 1.3 to 30 K. The magnetization in a steady magnetic field is found to follow a logarithmic time dependence for times up to 400 s suggesting a spectrum of activation energies. The magnetic viscosity parameters were used to investigate the temperature dependence of the observed large coercive fields and to study intrinsic temperature and thermal activation effects. It is found that the large change of the coercive field at very low temperatures is mainly …

Molecular Effects In Beam-Foil Collision-Induced Alignment Of He I, Timothy J. Gay, H. G. Berry, R. Deserio

Timothy J. Gay Publications

We have measured the alignment of beam-foil collision-excited states of He I produced by bombarding carbon foils of various (1.3-110 μg/cm²) areal densities with beams of He⁺ and HeH⁺. In addition, we have measured the total light yield of several transitions in He I, He II, and H as a function of foil thickness using beams of HeH⁺ ions. Experiments were done with He-foil exit energies of 125, 500, 550, and 650 keV. He I alignment decreases in all cases for the thinnest foils when molecular projectiles are used. Total light intensities generally increase …

Energy Dependence Of Alignment In Foil Collision-Excited N=3 States Of He I, Timothy J. Gay, H. G. Berry, R. Deserio, H. P. Garnir, R. M. Schectman, N. Schaffel, R. D. Hight, D.J. Burns

Timothy J. Gay Publications

We have measured the beam-foil collision-induced alignment of the 3p ¹P, 3p ³P, 3d ¹D, and 3d ³D states of He I for He+ beam energies between 30 and 1300 keV. The alignment of all four states is found to vary with beam-current density as well as energy. The number of secondary electrons emitted per incident ion, γ, has also been measured as a function of foil temperature and beam energy between 400 and 1400 keV. The rate of change of both alignment and γ with foil temperature exhibits …

A Topological Analysis Of The Complexity Of Computer Programs With Less Than Three Binary Branches, Warren Harrison, Kenneth I. Magel

Computer Science Faculty Research & Creative Works

No abstract provided.

Modeling Soil Water Contents And Their Effects On Stream Flow In Kentucky, Grant W. Thomas, Ronald E. Phillips, David E. Radcliffe, Scott Shepard

KWRRI Research Reports

Soil water contents of eight important soil series in Kentucky were measured periodically during the summer growing season for four years, 1977 through 1980. The soils divided into three groups according to their behavior. The first group (Maury and Crider) is well-drained and never showed excess water above field capacity at any time during the four seasons. The second group (Zanesville, Lowell, Calloway, Grenada and Shelbyville) showed perched water tables at times, especially during the early part of the growing season. The third group was represented by the Huntington soil which has a permanent water table.

The in-situ field capacity …

The Effect Of Deep Sea Bed Mining On Strategic Minerals And National Security, Gary R. Hammond

Marine Affairs Theses and Major Papers

Deep sea bed mining has been a topic of considerable debate since it became technically and economically viable as a mining venture in the mid 1960's. The availability of manganese nodules has been determined through costly "prospecting" operations and their existence in sufficient quantity and quality has been found to be adequate for the mining industry. Though the future of the nodule mining is undetermined, it is the purpose of this paper to determine its impact on the national management of its associated strategic minerals and national security.

Decision Analysis: A Systematic Approach To Environmental Impact Assessment, Richard E. Dodson

Marine Affairs Theses and Major Papers

The creation of the national Environmental Policy Act of 1969 was an explicit recognition by the congress for the need of a better management system to be used in environmental matters by all federal agencies. Section 102(2)(A) of the Act directs that a systematic, interdisciplinary approach be used in the planning and in the decision-making if the planned action may have an impact on the environment. While the council on Environmental Quality, which was created under the Act, has revised its regulations recently pertaining to the structure and format of Environmental Impact Statements (EIS), it has yet to articulate how …

Theory Of Electronic Excitations In Slow Atomic Collisions, John B. Delos

Arts & Sciences Articles

This review deals with quantitative descriptions of electronic transitions in atom-atom and ion-atom collisions. In one type of description, the nuclear motion is treated classically or semiclassically, and a wave function for the electrons satisfies a time-dependent Schrödinger equation. Expansion of this wave function in a suitable basis leads to time-dependent coupled equations. The role played by electron-translation factors in this expansion is noted, and their effects upon transition amplitudes are discussed. In a fully quantum-mechanical framework there is a wave function describing the motion of electrons and nuclei. Expansion of this wave function in a basis which spans the …

Interferometer Studies Of Equatorial Fregion Irregularities And Drifts, E. Kudeki, Bela G. Fejer, D. T. Farley, H. M. Ierkic

Bela G. Fejer

A radar interferometer technique developed at Jicamarca, Peru and first used to study electrojet irregularities has now been used successfully to study plasma turbulence in the equatorial F region. Our first results have shown that the most ‘turbulent’ echoes appear to come from a region that extends for tens of kilometers in altitude but for only a kilometer or less in the east-west direction. This slab may very well be the wall of a depleted region, a plasma ‘bubble’. Sometimes the irregularities can be tracked as they move eastward or westward. Velocity profiles for the evening period obtained in this …

The Menu Formation In A Computerized Nutrition System, Kathleen Ann Kostrzewa

Masters Theses

The creation of a diet is a complex process which involves analysis of a number of critical variables. Due to present technology, computers can be used effectively in menu planning and recipe analysis.

The objective of this study is the utilization of the computer to test the major criteria which must be met in order to produce a diet which meets nutritional, cost, and acceptability requirements. In this thesis, the design and implementation of a computerized menu planning system known as the Nutritional Data Base System is presented.

U-Pb Systematics And Ages Of Rocks From The Zone Of Cataclasis, Bitterroot Dome, Southwestern Montana, Edward Charles Arruda

Masters Theses

The eastern flank of the Bitterroot range, western Montana, consists of a 100 km-long zone of cataclasis which dips to the east. Zircons in sheared granitic plutons from three localities within this zone were dated using U-Pb methods. These zircons, which consist of anhedral cores and euhedral overgrowths, yield concordia lower-intercept ages of 48-52 million years before the present, dates which likely represent crystallization ages of the plutons. Shearing which affected these plutons, therefore, is significantly younger than the 72-76 million year age assigned for eastward movement of the Sapphire tectonic block whose detachment zone has been interpreted as the …

Bounded Solutions For Some Gradient Type Systems, A. R. Aftabizadeh

Mathematics Technical Papers

C. Corduneanu in [3,TH.1] investigated the existence of a unique bounded solution of the system [see pdf for notation] (1.1) with [see pdf for notation] continuous and of class c(2) in u. In this paper we shall prove the existence of a unique bounded solution of (1.1), stated in [3,TR.1], under weaker conditions, and also we shall discuss the asymptotic behavior of bounded solution of (1.1) on a half-line. We wish to mention that M. M. Belova [1] had similar ideas, but she did consider only a special case (space L2), and without concern for existence. Before we proceed further, …

Storm-Sewer Input Of Heavy Metals Into An Urban Lake Environment, George A. Duba

Dissertations

The purpose of this study was to measure the concentration of lead, cadmium, zinc and copper in runoff entering an urban lake ecosystem and to measure the distribution of these metals in selected tropic levels of the lake.

Fisk Lake was chosen as the study site and is located in East Grand Rapids, Michigan. Samples were collected of stormwater, rainwater and lakewater together with substrate, aquatic macrophytes Peltandra virginica, chironomid larvae, Chironomidae, snails Physa, and eight species of fish, Ictalurus nebulosus, Esox lucius, Lepomis gibbosus, L. macrochirus, Pomoxis nigromaculatus, Micropterus salmoides, Catostomus commersoni, and Perca flavescens. All samples were collected …

Monotone Method For Nonlinear Boundary Value Problems Arising In Transport Process, B. G. Pachpatte, V. Lakshmikantham

Mathematics Technical Papers

Recently, monotone iterative methods have been successfully employed to prove existence of multiple solutions and point-wise bounds on solutions of nonlinear boundary value problems for both ordinary and partial differential equations (see, [1], [3]-[6], [9]). In the transport process [10] of n different types of particles in a finite rod of length (b-a) the equation governing the particle's density is given by the following linear system of equations [see pdf for notation] where Ai, Bi (i = 0,1,2) are n x n matrices and x,y,p,q are n-vectors. The components x1,...,xn of the vector x represent the n distinct type of …

Multi-Scan Correlation To Separate Radar Tracks From False Alarms, R. I. Greenberg, R. E. Thurber, R. J. Prengaman

Computer Science: Faculty Publications and Other Works

An algorithm and computer software have been developed to filter out clutter in radar displays in order to clarify real tracks. Detections are generally declared valid when found to be part of a reasonable pattern of three or four detections in an eight scan history. The filtering process reduces the number of spurious reports by several orders of magnitude, providing significant improvement in distinguishing ships from waves and other sources of undesired radar reflections. The algorithm is being incorporated into radar system hardware in order to improve tracking of ships as signals are received. The method also shows promise for …

Maine's Whitewater Rapids And Their Relevance To The Critical Areas Program, Janet Mcmahon

Maine Collection

Maine's Whitewater Rapids and Their Relevance to the Critical Areas Program

by Janet McMahon

Planning Report No. 74, Critical Areas Program, 184 State St., Augusta, Maine,

April, 1981 (additions made in October, 1981). Reprinted July, 1983.

Contents: Introduction / Natural History of Whitewater Rapids / Methods / Criteria / Results / Conclusions / General Evaluation of Whitewater Rapids for Inclusion on the Register of Critical Areas / Bibliography / Action Plan

A Technique For The Isolation And Identification Of Aliphatic Amines In Water, Peter Alan Drew

Chemistry & Biochemistry Theses & Dissertations

Small, aliphatic amines added to a basic, aqueous solution (16.2 L) at a concentration of 100 parts per billion were isolated by sorption on a small column of macroreticular resin. The amines were eluted with diethyl ether; the eluate concentrated, and the compounds separated and identified by gas chromatography. The efficiency of the recovery of a-nines ranged from 5 to 28%.

A protocol for derivatizing pyrrolidine and n-pentylamine in ether with fluorinated acylating agents was developed. The method was found to be adequate for the detection of approximately 13 micrograms of &-nines in concentrated ether extract.

Environmental water samples …

A Method Of Modeling Multirate Two-Dimensional Recursive Digital Filters Author, Albert P. Gerheim

Electrical & Computer Engineering Theses & Dissertations

This dissertation presents a method of modeling two dimensional sampled data systems with two sampling rates in each dimension. This methodology is applied to the problem of synthesizing two dimensional velocity filters using one dimensional prototypes and multirate concepts.

The modeling method includes the replacement of scalar z-transforms of signals by vectors of polynomials, and the replacement of scalar z-transforms of impulse responses by matrices of polynomials.

The synthesis of velocity filters is accomplished through the use of coordinate transformations in the z-transform domain which skew the ω₁ -ω₂ axes on the unit bidisc. The filters synthesized using …

On Washout In Nonlinear Compartmental Systems, Jerome Eisenfeld

Mathematics Technical Papers

Let x(t) be a solution of a compartmental system. If, for some compartment j, x (t) -> 0 as t -> °°, then we say that compartment j washes out. We show that a compartment washes out if it always reaches (along a fixed path) either the environment or another compartment for which there is no return path. Additional criteria, particularly regarding exponential convergence, are also presented. Examples are drawn from tracer kinetics, enzyme reactions, and epidemic models.

On None Approach To Equilibrium In Compartmental Systems, Jerome Eisenfeld

Mathematics Technical Papers

The question of convergence of a solution of a compartmental system to an equilibrium point, as t -> °°, is of considerable interest [1-6]. Although it was not explicitly stated, the remarks in [1] seem to suggest that in the case of closed systems, of the type specified below, every solution approaches an equilibrium point. These remarks prompted the construction of counter examples, to be presented below, to show that a closed compartmental system may admit periodic solutions as well as aperiodic solutions that do not approach a constant vector.

Palynological Correlation Of The Kentucky No. 12 Coal, Gerald E. Vyhmeister

Loma Linda University Electronic Theses, Dissertations & Projects

In attempting to analyze the depositional environment for the Kentucky No. 12 Coal three columns were sampled from a 1 km area. The columns yielded 76 miospore species belonging to 33 genera, and representing in decreasing order of abundance, arborescent lycopods, tree ferns, calamites, small ferns, gymnospermous trees, seed ferns, herbaceous lycopods, and others from unknown origin.

The pattern of spore distribution in the columns did not appear to be affected by the presence of several partings, a feature which calls into question several mechanisms proposed for the origin of partings and also creates difficulties for an autochthonous origin for …

Growth And Recruitment Of Two Penaeids In The Bay Of St. Louis, Mississippi During 1979, Teresa C. Heaton

OES Theses and Dissertations

Juvenile brown (Penaeus aztecus, Ives) and white (Penaeus setiferus, Linnaeus) shrimp were collected from two stations of a nursery area in St. Louis Bay Mississippi, during May to October, 1979. Periods of shrimp recruitment and growth were determined to discern whether the concurrent environmental variables of salinity and temperature had an influence on shrimp abundance and yield. Growth estimates were obtained from length frequency measurements of trawl samples taken over a 24-h period per month from each station. An analysis of variance of length versus the variables of sex, month, station, time of day, salinity and …

Chemistry Of Organic N-Chloramines, Formation Of Arenesulfonamides By Derivatization Of Organic N-Chloramine With Sodium Arenesulfinate, Katherine F. Bowdring

Chemistry & Biochemistry Theses & Dissertations

Organic N-chloramines are recognized by-products of chlorinated water systems. Because of their chemistry, none have been isolated or identified.

This paper discusses a method for the derivatization of the organic N-chloramines based on a nucleophillic substitution mechanism. N-Chloro derivatives of amines of various structures were studied including primary and secondary aliphatic amines, as well as amino acids. The effect of the presence of other functional groups including aromatic and unsaturated systems was investigated.

Derivatization was done by three different methods, one involving derivatization of the pure N-chloramine, and two involving derivatizations of the N-chloramine generated in situ. Seventeen arenesulfonamides have …

High Performance Liquid Chromatographic Analysis Of Biogenic Amines, Thais Edwina Ahrendt Keegan

Chemistry & Biochemistry Theses & Dissertations

The objectives of this research were to develop a sensitive method for separation and quantitation of biogenic amines and to apply that procedure by monitoring neurochemical changes resulting from stimuli to the test system.

Primary aromatic amines were derivatized with o-phthalaldehyde-mercaptoethanol prior to chromatography, Separation of the fluorescent adduct was achieved using a μBondapak/ phenyl reversed-phase column and a two-step gradient of methanol:0.08 M acetic acid, pH J.O. Fluorescence was monitored using a J40 nm excitation energy and an emission filter which transmits radiation greater than 400 nm (50% T at 418 nanometers).

Following optimization of the chromatographic conditions, studies …

Characteristics Of Sediment Transport In Overwash Surges, Paul Richardson Bowen

OES Theses and Dissertations

Sediment samples taken from a washover deposit were used to determine the mode of sediment transport within overwash surges. The determination of sediment transport mode is based on the concept of hydraulic equivalency of different density grains. Hydraulic equivalency may be based on settling velocities or entrainment velocities. Two individual mineral grains of different densities cannot have the same settling and entrainment velocities. If the settling velocities of each grain are similar, then the less dense grain must be physically larger to settle at the same rate as the smaller denser mineral. However, once both of these grains have made …