Physical Sciences and Mathematics Commons^™

A Study Of Unique Factorization Domains, James D. Harris

Dissertations, Theses, and Masters Projects

No abstract provided.

Numerical Integration Of Systems With Large Frequency Ratios, James Thompson Howlett

Dissertations, Theses, and Masters Projects

No abstract provided.

Citellus Kimballensis, A New Late Pliocene Ground Squirrel, Douglas C. Kent

Bulletin of the University of Nebraska State Museum

A new fossil sciurid, Citellus kimballensis, is described. This new species was found in the Kimball Formation, uppermost Ogallala (very late Pliocene) at the University of Nebraska State Museum Collecting Locality Cn-1O1, northeast of Sidney, Cheyenne County, Nebraska. Characters of the dentition and skull of C. kimballensis are compared with those of other species of the genus, and with those of Cynomys.

Resonance Absorption Of P-Benzosemiquinone In The Zeeman Region, Juana Vivó Acrivos

Faculty Publications, Chemistry

No abstract provided.

Dickey-Lincoln School Lakes, Maine, U.S.A. And Quebec, Canada : Design Memorandum No. 2 Hydrology And Hydraulic Analysis: Section 1 - Climatology And Stream Flow, United States Army Corps Of Engineers, New England Division

Dickey-Lincoln School Lakes Project

This section I is the first of four sections comprising Design Memo-randum No. 2. The other sections are: II - Dickey Dam - Spillway Design Flood, III - Lincoln School Dam - Spillway Design Flood and IV - Flood Analysis and Reservoir Regulation. la section I, hydro-logic studies will be confined generally to the drainage area of the Saint John River above the gaging station at Fort Kent, Maine. The purpose of section I is to present the climatological and streamflow data for the Saint John River above Fort Kent in order to establish hydrologic criteria for the design of …

American Opisthobranch Mollusks, Eveline Marcus, Ernst Marcus

Studies in Tropical Oceanography

No abstract provided.

Proceedings Of The International Conference On Tropical Oceanography, International Conference On Tropical Oceanography

Studies in Tropical Oceanography

No abstract provided.

The Monotypic North American Subgenus Larandrena Of Andrena (Hymenoptera: Apoidea), D. W. Ribble

Bulletin of the University of Nebraska State Museum

Larandrena contains a single species, A. miserabilis Cresson. This small, common Andrena is found throughout most of the United States and southern Canada in the spring. The subgeneric position, nomenclature, redescription. variation, notes on the biology, parasites, range, seasonal activity and plant host records are included. A. rniserabilis is thought to be an important pollinator of fruit trees.

Earthworms: Their Intensive Propagation And Use In Biological Soil Building - Part Iii, Thomas Barrett

Green Revolution

Reprint of section of book Earthworms by Thomas Barrett.

Tolerance Regions For A Joint Exponential Distribution, Lee J. Bain

Mathematics and Statistics Faculty Research & Creative Works

The evaluation of the reliability of a system of components, when the components are assumed to follow a joint exponential distribution, is considered. The approach used is to develop tolerance regions for the joint exponential distribution or to estimate the probability content of the appropriate specification region. Copyright © 1968 by The Institute of Electrical and Electronics Engineers, Inc.

Thermophysical Properties Of Bark Of Shortleaf, Longleaf, And Red Pine, William E. Reifsnyder, Lee P. Herrington, Karl W. Splat

Yale School of the Environment Bulletin Series

No abstract provided.

The Structure Of Germination In Pinus Lambertiana Dougl., Graeme P. Berlyn

Yale School of the Environment Bulletin Series

No abstract provided.

Reaction Of Titanium Tetrafluoride With Di-N-Propylamine In Acetonitrile, Roger Nass

Honors Theses, 1963-2015

No abstract provided.

Food Safety Program: Endrin Monitoring In The Mississippi River, Arthur F. Novak, M. R. Ramachandra Rao

Journal of the Minnesota Academy of Science

Twelve successive monthly samplings and analyses of representative fish and shellfish and of mud and water from the lower Mississippi River showed neither a high concentration of endrin nor a time-ordered change in the concentration. The general absence of endrin from the samples indicated no significant contamination.

The Fate Of Pesticide Residues In Soil, Russell S. Adams Jr.

Journal of the Minnesota Academy of Science

Pesticidal chemicals may be lost from or inactivated in soil by volatilization, leaching, sorption, chemical' degradation, microbial decomposition, or plant removal. The persistence of o pesticide in soil depends upon the chemical nature of the pesticide and certain characteristics of the soil. Soil mineral and organic colloids sorb these compounds very tightly and restrict microbial decomposition of the pesticide. Conditions favoring microbial activity in the soil also favor the disappearance of pesticide residues. Factors that contribute to the persistence of o pesticide ore the some factors that increase its persistence.

Panthera Atrox (Mammalia: Felidae) From Central Alaska, Frank C. Whitmore Jr., Helen L. Foster

United States Geological Survey: Staff Publications

A lower jaw of the large Pleistocene cat Panthera atrox (Leidy) was found on an alluvial flat near the mouth of Lost Chicken Creek, about 180 miles northeast of Fairbanks, Alaska. It was probably washed out of carbonaceous silt deposits which, in the adjacent area, have also yielded bones of Equus, Bison, Rangifer, Cervus, and Elephantidae. The Panthera jaw falls within the size range of the series from Rancho La Brea, California, and differs from Rancho La Brea specimens only in a few characteristics. P. atrox appears to have been significantly larger than extinct or …

Elephant Teeth From The Atlantic Continental Shelf, Frank C. Whitmore Jr., K. O. Emery, H. B. S. Cooke, Donald J. P. Swift

United States Geological Survey: Staff Publications

Teeth of mastodons and mammoths have been recovered by fishermen from at least 40 sites on the continental shelf as deep as 120 meters. Also present are submerged shorelines, peat deposits, lagoonal shells, and relict sands. Evidently elephants and other large mammals ranged this region during the glacial stage of low sea level of the last 25,000 years.

Stratigraphy Of The Lower Morrison Formation Along The Defiance Monocline, New Mexico And Arizona, Robin Clair Lease

Earth and Planetary Sciences ETDs

Along the western border of the San Juan Basin a prominent cliff-forming, orange sandstone has been incorrectly mapped as a part of the Recapture Shale Member of the Morrison Formation. This stratigraphic unit is here given the informal name, Beautiful Mountain member, and has stratigraphic continuity with the Salt Wash Sandstone Member in Red Rock Valley and the Cow Springs Sandstone in Todilto Park, New Mexico. The Recapture Shale Member is restricted to the pink and pale-green, slope-forming sandstone above these orange sandstone beds and below the Westwater Canyon Sandstone Member.

The Beautiful Mountain member is predominantly a lenticularly bedded, …

Effect Of Environmental Hydrogen Pressure On The Hydrogen Yield From X‐Irradiated Polyethylenes, Otto H. Hill, R. Pat Lightfoot

Physics Faculty Research & Creative Works

An experimental assembly incorporating a capacitance‐type, differential pressure transducer, which provides resolutions of 3 x 10−4 torr at pressures extending to 30 torr, has been employed to monitor the effect of hydrogen environmental pressure on the hydrogen yield from x‐irradiated polyethylene's. Contrary to the observations of previous investigators, the hydrogen yield is found to be independent of hydrogen environmental pressures extending over the critical range up to at least 30 torr. It is demonstrated that neglecting the temperature and density gradients inherent in closed‐volume irradiation assemblies employing cryogenic traps to separate liberated gases into condensable and non condensable fractions may …

Ferroelectric Properties Of Pbzro₃-Bifeo₃ Solid Solutions, Robert Gerson, Pen-Chu Chou, William Joseph James

Physics Faculty Research & Creative Works

Solid solutions of BiFeO and PbZrO₃ were investigated for crystallographic and dielectric properties. A new pseudocubic perovskite phase was found, which has been tentatively indexed as orthorhombic with the same unit cell as PbZrO₃ but with dielectric properties characteristic of a ferroelectric substance. The Curie point in this series of solid solutions has a minimum of about 155°C at a composition of about (PbZrO₃)_0.80 (BiFeO₃)_0.20, which at room temperature lies on the boundary between the orthorhombic antiferroelectric and the pseudocubic ferroelectric phases. This composition has a relative dielectric constant of 800 …

Physicochemical Limnology Of Four Reservoirs In Southwest Nebraska, Donald L. Tennant, Robert E. Thomas, Robert E. Thomas, Joe Gray

Nebraska Game and Parks Commission: Staff Research Publications

Physicochemical data from four reservoirs in Nebraska taken within a 30-hour period in August, revealed moderate thermal stratification, closely associated in two reservoirs with the functioning low-level outlet. The reservoirs with thermoclines exhibited greater temperature ranges and contained cooler waters than did reservoirs without thermoclines. The distribution of fish as detected on sonar often revealed the presence and location of a thermocline prior to physical or chemical data verification.

Without exception, the larger the reservoir and the lower the outlet, the better the reservoir fishery. Downstream fisheries ranked the same with one exception.

Analysis Of Reservoir Recreation Benefits, Robert Cecil Tussey Jr.

KWRRI Research Reports

Recreation visitation to two Kentucky reservoirs (Rough River and Dewey) constructed by the U.S. Army Corps of Engineers was studied to develop mathematical expressions for estimating numbers of visitors and recreation benefits. Regression analysis was used to relate characteristics of 168 origin areas (120 Kentucky counties, the District of Columbia, and the remaining states excluding Hawaii and Alaska) to visitation from that area to Rough River Reservoir. The resulting equations were then applied to Dewey to test their generality. Good results were obtained when only air distance and population were used as the independent variables. Correlations including the age and …

The Effect Of Landowner Attitude On The Financial And The Economic Costs Of Acquiring Land For A Large Public Works Project, John Malvern Higgins Jr.

KWRRI Research Reports

The purpose of this study was to examine the various economic and financial costs relating to the acquisition of property required for the construction of three reservoirs and to determine if any correlation could be made between the attitudes of the landowners selling property and the costs. Rough River Reservoir, Dewey Reservoir, and West Fork of Mill Creek Reservoir were studied. The costs involved in purchasing right-of-way were classified qualitatively and quantified to the extent possible. A procedure was devised to quantify 15 factors influencing attitude and an equation was derived to predict the landowner's attitude from these determining factors. …

Derivation Of Reservoir Operating Rules By Economic Analysis, Charles O. Dowell

KWRRI Research Reports

The purpose of this study was to develop a methodology for determining an optimum set of reservoir operating rules specifying the of storage space based on the example of Rough River Reservoir, a Corps of Engineers project in Breckinridge and Grayson Counties, Kentucky, and assuming this multipurpose reservoir provides flood control, water supply, and recreation. The operating rules were derived by the method of marginal analysis which uses as its criteria achievement of maximum net benefits from the available storage capacity.

Benefit relationships were derived for each use. The variation of flood control benefits with available flood storage was determined …

Roughness Characteristics Of Natural Channels, Harry H. Barnes Jr.

United States Geological Survey: Publications

Color photographs and descriptive data are presented for 50 stream channels for which roughness coefficients have been determined. All hydraulic computations involving flow in open channels require an evaluation of the roughness characteristics of the channel. In the absence of a satisfactory quantitative procedure this evaluation remains chiefly an art. The ability to evaluate roughness coefficients must be developed through experience. One means of gaining this experience is by examining and becoming acquainted with the appearance of some typical channels whose roughness coefficients are known. The photographs and data contained in this report represent a wide range of channel conditions. …

Paleotectonic Investigations Of The Permian System In The United States, Edwin D. Mckee, Stephen S. Oriel, Henry L. Berryhill, Eleanor J. Crosby, Donald A. Myers, George H. Dixon, Marjorie E. Maclachlan, Melville R. Mudge, Edwin K. Maughan, Richard P. Sheldon, Earl R. Cressman, Thomas M. Cheney, Walter E. Hallgarth, Keith B. Ketner

United States Geological Survey: Publications

(A) Allegheny region, by Henry L. Berryhill, Jr

(B) Gulf Coast region, by Eleanor J. Crosby

(C) West Texas Permian basin region, by Steven S. Oriel, Donald A. Myers, and Eleanor J. Crosby

(D) Northeastern New Mexico and Texas-Oklahoma Panhandles, by George H. Dixon

(E) Oklahoma, by Marjorie E. MacLachlan

(F) Central Midcontinent region, by Melville R. Mudge

(G) Eastern Wyoming, eastern Montana, and the Dakotas, by Edwin K. Maughan

(H) Middle Rocky Mountains and northeastern Great Basin, by Richard P. Sheldon, Earl R. Cressman, Thomas M. Cheney, and Vincent E. McKelvey

(I) Western Colorado, southern Utah, and northwestern New …

A Revision Of The Bees Of The Genus Andrena Of The Western Hemisphere. Part I. Callandrena. (Hymenoptera: Andrenidae), Wallace E. Laberge

Bulletin of the University of Nebraska State Museum

This paper is the first part of a monograph of the bee genus Andrena in the western hemisphere and treats the subgenus Callandrena. Available data regarding phylogeny, distribution, biology, and flower preferences are presented together with keys to separate the species, diagnoses and descriptions of the species and discussions of geographic variation when applicable. Seventy-nine species and one subspecies are recognized. Sixteen names are relegated to synonymy, one to homonymy and eight are removed from the subgenus Callandrena. The thirty-nine species new to science are: aerifera, aeripes, afimbriata, ardis, auripes, balsamorhizae, beameri, bilimeki, bullata, calvata, dreisbachorum, fulminea, fulminoides, …

Theory Of Rbe For Heavy Ion Bombardment Of Dry Enzymes And Viruses, J. J. Butts, Robert Katz

Robert Katz Publications

The response of dry enzymes and viruses to heavy ion bombardment may be predicted from their response to γ-irradiation (and no further knowledge of their size and structure). The molecules are approximated as point particles whose response to ionization is the same for heavy ion bombardment as for γ-rays. From the δ-ray distribution formula and an extrapolated range-energy relation for electrons, the radial distribution of secondary ionization energy may be found. Under this dosage distribution the inactivation probability may be found as a function of radial distance from the ion's path, and then may be integrated over all space to …

Polarography, James Mccarty

Honors Theses

Jaroslav Heyrovsky invented the technique of polarography about 1920 at Charles University in Prague. With proper use one can obtain both qualitative and quantitative analyses of solutions of electro-oxidizable or electro-reducible substances at concentrations.

The key part of a polarography is the dropping mercury electrode. This consists of a fine bore capillary tube connected to a large reservoir of mercury. Each tiny drop which falls from the capillary has approximately the same surface area and takes about the same time to form and fall. The greatest advantage is that each drop is actually a new electrode, and there is consequently …

An Introduction To Linear Programming, Lana Sue Legrand

Honors Theses

This paper represents a study of the text An Introduction to Matrices, Vectors, and Linear Programming. It is composed chapter by chapter taking the more important statements, definitions, and theorems from each and working out exercises to illustrate their meaning. Other exercises were worked in the course of the study than are included in this paper but these were selected as brief illustrations of the type of problems that were worked.