Physical Sciences and Mathematics Commons^™

Toward An Energy Policy, Dean E. Abrahamson

Journal of the Minnesota Academy of Science

The lack of a national policy on fuels and energy at a time of concern about the future supply and demand for energy and the environmental effects of creating energy is examined. Alternatives to present practices in generating and utilizing power are considered along with suggestions for measuring the "energy cost" of technological progress.

Front Matter

Journal of the Minnesota Academy of Science

No abstract provided.

Pollution From Sewage Loading In River And Lakes Downstream From Bemidji, James Ludwig

Journal of the Minnesota Academy of Science

The deleterious effects and downstream distribution of pollutants from domestic sewage discharged at Bemidji, Minnesota, are examined with reference lo parameters for pollution as defined by the state's Pollution Control Agency (PCA). Periodic overloading of the resort city's sewage treatment plant also is considered, along with problems pertinent to a community upstream of popular vacation facilities on a lake and river system.

A Water Quality Survey, Dale E. Mcmichael

Journal of the Minnesota Academy of Science

Representative factors influencing water quality in the Albert Lea, Minnesota area were chosen as to assess water quality and changes in the watershed which has been described as an earlier valley of the Shell Rock River.

Parameters representative of chemical, bacterial, and thermal pollution were, respectively, total phosphorous, total and fecal coliform counts, and temperature. Statistical analysis has revealed that significant differences in some parameters measured do exist when various sampling stations of a given sampling date are compared. Statistical analysis also has indicated that correlations do exist between fluctuation patterns when all sampling stations of a given sampling date …

Some Aspects Of Ties In Wilcoxon Signed Ranks, Kathleen M. Keenan

Journal of the Minnesota Academy of Science

Assuming basic principles of statistical inference, the signed rank and rank sum hypothesis testing procedures of Wilcoxon ore reviewed briefly and illustrated. Some recent literature of interest is cited. The problem of ranking tied data is considered, and the effect of ties on the distribution of the signed rank statistic is examined.

Nickel Mining And The Bwca: A Question Of Priorities, Walter E. Parham

Journal of the Minnesota Academy of Science

A conflict in potential land use of the Boundary Waters Canoe Area (BWCA) exists between those who wish to see the area open to mining and those who want it retained as a natural wilderness. A review of information available to the public which relates to possible nickel mining within the BWCA suggests that the BWCA itself in its natural state is a more valuable resource to the people of the United States than it is as a source for nickel. The high U.S. rate of consumption of nickel, our use of nickel in products in which it is non-essential, …

Some Classes Of Hadamard Matrices With Constant Diagonal, Jennifer Seberry, Albert Leon Whiteman

Faculty of Informatics - Papers (Archive)

The concepts of circulant and back circulant matrices are generalized to obtain incidence matrices of subsets of finite additive abelian groups. These results are then used to show the existence of skew-Hadamard matrices of order 8(4f+l) when f is odd and 8f + 1 is a prime power. This shows the existence of skew-Hadamard matrices of orders 296, 592, 1184, 1640, 2280, 2368 which were previously unknown.

A Construction For Hadamard Arrays, Joan Cooper, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

We give a construction for Hadamard arrays and exhibit the arrays of orders 4t , tE{l,3,5,7, ... 19} This gives seventeen new Hadamard matrices of order less than 4000.

Orthogonal (0,1,-1) Matrices, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

We study the conjecture: There exists a square (0,l,-l)-matrix W = W(w,k) of order w satisfying

WW^T= kI_w

for all k = 0, 1,..., w when w = 0 (mod 4). We prove the conjecture is true for 4, 8, 12, 16, 20, 24, 28, 32, 40 and give partial results for 36, 44, 52, 56.

On Integer Matrices Obeying Certain Matrix Equations, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

We discuss integer matrices B of odd order v which satisfy

Br = ± B, BBr = vI - J, BJ = O.

Matrices of this kind which have zero diagonal and other elements ± 1 give rise to skew-Hadamard and n-type matrices; we show that the existence of a skew-Hadamard (n-type) matrix of order h implies the existence of skew-Hadamard (n-type) matrices of orders (h - 1)⁵ + 1 and (h - 1)⁷ + 1. Finally we show that, although there are matrices B with elements other than ± 1 and 0, the equations force considerable restrictions …

Cyclotomy, Hadamard Arrays And Supplementary Difference Sets, David C. Hunt, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

A 4n x 4n Hadamard array, H, is a square matrix of order 4n with elements ± A, ± B, ± C, ± D each repeated n times in each row and column. Assuming the indeterminates A, B, C, D commute, the row vectors of H must be orthogonal. These arrays have been found for n = 1 (Williamson, 1944), n = 3 (Baumert-Hall, 1965), n = 5 (Welch, 1971), and some other odd n < 43 (Cooper, Hunt, Wallis).

The results for n = 25, 31, 37, 41 are presented here, as is a result for n = 9 not based on supplementary difference …

Huxley Humus, 1972, Volume 02, Issue 01, Shriley Weston, Huxley College Of The Environment, Western Washington University

Historical Collection of Huxley Newsletters

No abstract provided.

Vibrational Analysis Of Octahedral Molecules, Magdi Aziz Girgis

Archived Theses and Dissertations

No abstract provided.

Surface Area And Pore Structure Of Low Porosity Cement Pastes, Ghassan Andrawes Oweimreen

Archived Theses and Dissertations

No abstract provided.

On Supplementary Difference Sets, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

Given a finite abelian group V and subsets S₁, S₂, ... ,S_n of V, write T_i for the totality of all the possible differences between elements of S_i (with repetitions counted multiply) and T for the totality of members of all the T_i. If T contains each non-zero element of V the same number of times, then the sets S_1, S₂,...,S_n will be called supplementary difference sets.

We discuss some properties for such sets, give some existence theorems and observe their use in the construction of Hadamard …

Miocene Amphicyonids (Mammalia, Carnivora) From The Agate Spring Quarries, Sioux County, Nebraska, Robert M. Hunt Jr.

Department of Earth and Atmospheric Sciences: Faculty Publications

The Miocene late Arikareean land mammal "age" is largely defined by the faunal assemblage from the Agate Spring Quarries and other nearby localities in the Harrison Formation of Sioux County, Nebraska. Amphicyonid carnivores of the genera Cynelos Jourdan and Ysengrinia Ginsburg were previously known only from European Oligocene and Miocene deposits. These genera are now known from the Harrison Formation of Sioux and Box Butte counties, western Nebraska, and therefore the late Arikareean fauna now includes three amphicyonids: Cynelos sp., (?) Ysengrinia sp., Daphoenodon superbus Peterson. The stage of evolution of these carnivores suggests a correlation of the Agate Spring …

Heavy Metals - An Inventory Of Existing Conditions, M. E. Bender, R. J. Huggett, H. D. Slone

VIMS Articles

In this paper we report on studies undertaken to: (1) establish 1nercury levels in biota and sediments from the lower portion of Chesapeake Bay; (2) describe the pattern of metal distribution in oysters from 3 Virginia estuaries; and (3) determine if estuarine sediments can be used to detect the effects of man's activities on the environn1e nt. To date, mercury analyses of biota from the Bay area have sho\vn no levels in excess of FDA guidelines, nor have they indicated any influence of man's activities in the areas studies. Oysters have been shown to vary naturally in their body burdens …

Thomson's E/M Experiment Revisited, Michael Glascock, Don M. Sparlin

Physics Faculty Research & Creative Works

The objective of this experiment is to familiarize the student with the impulse theorem, electron dynamics, and magnetic field contours. He is challenged to obtain accurate as well as precise measurements with suboptimum apparatus through correct analysis. He also investigates the influence of various systematic errors using model calculations on a small computer. © 1972, American Association of Physics Teachers. All rights reserved.

Application Of The Weiss Molecular Field Theory To The B‐Site Spinel, W. E. Holland, Harry A. Brown

Physics Faculty Research & Creative Works

A molecular field treatment of the B‐site spinel was used to determine the ordering temperatures and the asymptotic Curie temperature in terms of the exchange integrals. The theory was developed from a 16‐sublattice model and took into account interactions between an atom and its nearest to fourth‐nearest neighbors. Experimental values of the ordering temperatures and the asymptotic Curie temperature were then used to determine the exchange integrals for the systems Hg1−xCdx Cr2 S4, CdCr2S4(1−y)Se4y, and Zn1−xCdxCr2Se4. Copyright © 1972 WILEY‐VCH Verlag GmbH & Co. KGaA

Adsorption Of Rare Gas Atoms On Xenon, Donald E. Hagen

Physics Faculty Research & Creative Works

The problem of adsorption of rare gas atoms on solids is treated for the case of submonolayer films. An energy spectrum calculation method which is suitable for band structure or heat capacity calculations is discussed. It is particularly useful for adsorbate-substrate systems in the region intermediate between "tight binding" and "plane wave" behavior. The method employs a technique introduced by Kohn and Luttinger of using the eigenfunctions corresponding to a particular point in the Brillouin zone as a basis set. The cases of He and Ne adsorbed on Xe are discussed.

Excited-Ion Lifetimes Using Penning-Ionizing Collisions, William F. Parks, Laird D. Schearer

Physics Faculty Research & Creative Works

We show that in the Penning-ionizing collision He(23S1)+X→He(11S0)+(X+)*+e the precession of the Hem spin at its Larmor frequency forces the J polarization of the Penning ion to rotate at the same frequency but shifted in phase. The tangent of the phase shift is proportional to the lifetime of the ionic state and presents a unique method for measuring excited-ion lifetimes. © 1972 The American Physical Society.

Ecological Significance Of Vegetation To Northern Pike, Esox Lucius, Spawning, D. B. Mccarraher, Robert E. Thomas

Nebraska Game and Parks Commission: Staff Research Publications

Since 1955, information has been collected from six Nebraska sandhill lakes to evaluate northern pike spawning success based on type of aquatic vegetation preferred by pike for spawning. The lakes, all located in Cherry County, were Big Alkali, Watts, Hackberry, Cottonwood, Shell, and Pelican. Several investigators have commented that pike year class strength is closely related to type and abundance of aquatic vegetation present in a lake (Clark and Steinbach, 1959; Forney, 1967). Documented information on spawning habitats is scant other than vague references to pike spawning over submerged vegetation or inundated meadows.

Metric Conversion For Agriculture, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

Farmers are already becoming involved with metric units and by 1974 conversion of the farming industry will be well advanced. Wool sales converted to metric measurements in August, 1971, and sales by the various grain marketing boards will be largely in metric terms in the 1972 harvest. Weather information to the public has been given in metric terms since September 1.

Interactions Of Pesticides And Phytoplankton, Pamela H. Philyaw

Retrospective Theses and Dissertations

No abstract provided.

Birch Reduction Of Benzamide, N-Substituted Benzamides And Biphenylene, Luther Dickson

University of the Pacific Theses and Dissertations

The Birch reduction of benzamide with sodium and absolute ethanol. 95% ethanol, or tert-butanol in liquid ammonia gave 1,4-dihydrobenzamide in varying amounts. The amide group was not reduced. The two most important variables encountered were the alcohol used and whether or not ammonium chloride was added after the reduction was completed. Without this addition of ammonium chloride, little or no 1,4-dihydrobenzamide was present after workup, while with its addition some 1,4-dihydrobenzamide formed whether the proton source was absolute ethanol, 95% ethanol, or tert-butanol. The highest yield was obtained with tert-butanol with ammonium chloride being added. Addition of ammonium chloride apparently …

The Howard University Reviews Of Science, Vol 1 No 2, Department Of Physics

Physics Faculty Publications

No abstract provided.

Groundwater Flow In A Sandy Tidal Beach 2. Two-Dimensional Finite Element Analysis., C. S. Fang, S. N. Wang, W. Harrison

VIMS Articles

Two-dimensional finite element techniques are described that model closely the complicated fluctuations osbserved in the water table of an ocean beach. The use of triangular elements permits the specification of more realistic boundary conditions than the use of line elements in a one-dimensional model. Also, results obtained from the two-dimensional model for the region closet o the ocean compare more favorably with field data than results obtained from the one-dimensional finite element model.

Late Quaternary Eustatic Sea-Level Changes Along The Malibu Coast, Los Angeles County, California, Peter W. Birkeland

United States Geological Survey: Staff Publications

Late Quaternary relative sea-level changes along the Malibu coast can be deciphered by study of geomorphic features and marine and associated stream deposits. Evidence for such changes includes (a) stream downcutting in large valleys during low stands of sea level, (b) stream aggradation in the same valleys during high stands of sea level, and (c) marine shoreline angles whose altitudes coincide with the tops of valley-fill stream deposits. This evidence, and open-system uranium-series dates for shells from the Corral and Dume terrace deposits, provide a time scale for certain sea-level changes. Evidence from other …

Pheasant Production Using Wild Cocks And Penned Game-Farm Hens, Michael R. Grode

Electronic Theses and Dissertations

Pheasant production using free-flying wild cooks and penned game-farm hens was evaluated during 1971. Hens were placed in 0.5-acre pens to compare production at density levels of 10, 20, and 40 hens per acre. Wild cooks entered the 0.5-acre pens the day following introduction of the game-farm hens. The greatest numbers of cooks were observed in the pens with the highest density of hens. Censusing in mid-March indicated a population of 12 to 15 wild cooks in the vicinity of the study pens. A known mortality of 31 hens occurred and percentage mortality was similar at each density level. Pulling …

La Migration Des Trichoptères Cavernicoles. Mise En Évidence Par Piégeage Lumineux, Yvette Bouvet

International Journal of Speleology

The Trichoptera from the group “Stenophylax” are frequent in caves. Until now, following Jeannel’s thought (1926), most authors believed that these animals were found in caves by hazard and were doomed to perish in them. With the use of a light trap it is now demonstrated that cavernicolous Trichoptera not only stay in caves during the entire summer, but also that during autumn (September-October) they leave the caves to lay their eggs in the nearby rivers.