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Articles 283981 - 284010 of 293870
Full-Text Articles in Physical Sciences and Mathematics
A Construction For Hadamard Arrays, Joan Cooper, Jennifer Seberry
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
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
WWT= kIw
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
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
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
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.
Groundwater Of The Spiritwood Lake Area, Stutsman County, North Dakota, Frank J. Schulte
Groundwater Of The Spiritwood Lake Area, Stutsman County, North Dakota, Frank J. Schulte
Theses and Dissertations
The Spiritwood Lake study area is in a generally undulating to rolling glacial plain 17 miles north and east of Jamestown, North Dakota. Spiritwood Lake is about 50 feet below the surface of the bedrock plain in a former melt-water channel. In the study area, glacial drift unconformably overlies the Pierre Shale, the youngest pre-Pleistocene sediment. The boundary between the two units is marked by a zone of shattered Pierre Shale. The top of this shattered zone forms a plain of moderate relief which probably was the preglacial surface of the study area.
Two large valleys can be distinguished in …
Annotated Bibliography Of The Geology Of North Dakota, 1806-1959, Mary Woods Scott
Annotated Bibliography Of The Geology Of North Dakota, 1806-1959, Mary Woods Scott
Theses and Dissertations
References to the literature on North Dakota geology published between 1805 and 1960 are listed in this annotated bibliography. Published bibliographies on North American geology, bibliographies on geological subjects important to North Dakota, unpublished lists of references, and references cited in each entry herein were used to compile the bibliography. Each reference is provided with an annotation of its contents. A subject and geographical index and a list of serials cited are included.
Applied Geology Of The Bismarck-Mandan Area, North Dakota, Gerald H. Groenewold
Applied Geology Of The Bismarck-Mandan Area, North Dakota, Gerald H. Groenewold
Theses and Dissertations
The Bismarck-Mandan area includes about 350 square miles located along both sides of' the Missouri River in south-central North Dakota. The area can be divided into two major physiographic divisions: the broad Missouri River floodplain and the nearly flat uplands which are dissected by minor streams. Geologic units in the area include Upper Cretaceous and lower Tertiary sandstone, siltstone, and shale and Quaternary sand, silt, clay, and gravel.
Expansion of residential areas around the cities of Bismarck and Mandan results in conflicts in land-use between agricultural, urban, and resource development. This study consists of detailed geologic maps and a series …
On Supplementary Difference Sets, Jennifer Seberry
On Supplementary Difference Sets, Jennifer Seberry
Faculty of Informatics - Papers (Archive)
Given a finite abelian group V and subsets S1, S2, ... ,Sn of V, write Ti for the totality of all the possible differences between elements of Si (with repetitions counted multiply) and T for the totality of members of all the Ti. If T contains each non-zero element of V the same number of times, then the sets S1, S2,...,Sn 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.
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
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 …
Application Of The Weiss Molecular Field Theory To The B‐Site Spinel, W. E. Holland, Harry A. Brown
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
Excited-Ion Lifetimes Using Penning-Ionizing Collisions, William F. Parks, Laird D. Schearer
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
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.
Interactions Of Pesticides And Phytoplankton, Pamela H. Philyaw
Interactions Of Pesticides And Phytoplankton, Pamela H. Philyaw
Retrospective Theses and Dissertations
No abstract provided.
Le Cinquantenaire Du Premier Institut De Spéléologie Du Monde, Traian Orghidan
Le Cinquantenaire Du Premier Institut De Spéléologie Du Monde, Traian Orghidan
International Journal of Speleology
Description of the activities carried out by the first speleological institute of the world, the Institutul de Spéologie “Emil Racovitza”, founded in 1920 at Cluj in Romania.
On The Food And Feeding Habits Of Lepidomysis Longipes (Pillai & Mariamma) (Crustacea Mysidacea), C. N. Nath, N. K. Pillai
On The Food And Feeding Habits Of Lepidomysis Longipes (Pillai & Mariamma) (Crustacea Mysidacea), C. N. Nath, N. K. Pillai
International Journal of Speleology
The amount of food available to the subterranean mysid, Lepidomysis longipes (Pillai & Mariamma, 1964) in its habitat has been calculated and analysed. Lepidomysis appears to feed mainly on decaying vegetable matter. Lepidomysis shows many modifications in its external morphology. Consequently, the mode of feeding has undergone some marked changes from that of its epigean relatives. L. longipes is a discontinuous feeder.
Observations Sur Un Aselle Obscuricole De France: Proasellus Racovitzai N.Sp. (Crustacea Isopoda Asellota), Jean-Paul Henry, Guy Magniez
Observations Sur Un Aselle Obscuricole De France: Proasellus Racovitzai N.Sp. (Crustacea Isopoda Asellota), Jean-Paul Henry, Guy Magniez
International Journal of Speleology
This paper reports the description of a new species of the genus Proasellus Dudich. Proasellus racovitzai n.sp. is widely depigmented. The eyes are reduced. It lives in the underground stream of the Goueil-di-Her cave system (Haute-Garonne, France). The species is an old, endemic form of the phyletic line of the modern epigean species P. meridianus (Racovitza). Chromosome number of the new species: 2n = 22.
Biométrie Spatiale Dans L'Écosystème Souterrain: Répartition De Meta Menardi Latr. (Argiopidae), R. R. Tercafs
Biométrie Spatiale Dans L'Écosystème Souterrain: Répartition De Meta Menardi Latr. (Argiopidae), R. R. Tercafs
International Journal of Speleology
The spatial distribution of 113 individuals from the species Meta menardi Latr. (Argiopidae) divided in 10 different populations living in 8 Belgian caves has been studied. A grouping test and the calculation of R according to Clark et Evans (1954), based on the measurement of the distance to the nearest neighbour, have been used. Results show that the individuals are distributed at random inside their biotope.
Adsorption Of Dichromate At The Air-Solution Interface, Josephine Juch Wang
Adsorption Of Dichromate At The Air-Solution Interface, Josephine Juch Wang
Masters Theses
"The adsorption of dichromate ion with the surfactants, tetradecylpyridinium bromide and tetradecyltrimethylammonium bromide at the air-solution interface was studied by surface tension and turbidity measurements in order to better understand the process of ion flotation. Surface tension measurements were used to study the effect of dichromate ion concentration on precipitation in dilute surfactant solutions. At higher concentration, near and above the cmc, light scattering was used to detect precipitation. The concentration of dichromate required to cause precipitation decreases with increasing surfactant concentration until the erne is approached, after which increasing concentrations of dichromate are required with increasing concentration of surfactant. …
Clay Mineralogy Of Late Pleistocene Sequences In Northwestern Washington And Southwestern British Columbia, Michael Arthur Hepp
Clay Mineralogy Of Late Pleistocene Sequences In Northwestern Washington And Southwestern British Columbia, Michael Arthur Hepp
WWU Graduate School Collection
Pleistocene clay-bearing sediments of parts of northwestern Washington and southwestern British Coliambia were studied in an attempt to determine the clay mineral composition of these units; the origin of these clay minerals; and any correlation between clay mineral composition, sediment type, location, or probable geologic history of the sediments. The Pleistocene stratigraphy of the area is fairly well known, although in some specific locations the stratigraphy has not been determined. Recorded work in the region dates back to Dawson (1887). The units studied range in age from the greater than 50,000 year old Double Bluff Drift to Holocene (Recent) river …
A Sedimentary Core Analysis Of Late Pleistocene To Recent Sediments In A Portion Of Bellingham Bay, Washington, James T. Lowe
A Sedimentary Core Analysis Of Late Pleistocene To Recent Sediments In A Portion Of Bellingham Bay, Washington, James T. Lowe
WWU Graduate School Collection
Sub-bottom profiles and core sampling indicate that a trough-like depression below the bay near South Bellingham is a Pleistocene erosional paleotopographic surface sloping bayward from the uplandds to the east. A series of Late Pleistocene glacial till and glaciomarine deposits overlie the erosional surface and fill the depression. The glacial deposits are overlain by Recent sand and mud deposits which are rich in wood fragments and shell materials.
Bellingham Bay is basin-shaped with a deep narrow trough to the west. The Pleistocene basement is generally structureless and conforms to the bay bottom. Several trough shaped depressions which are overlain by …
The Howard University Reviews Of Science, Vol 1 No 2, Department Of Physics
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
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
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
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 …
Classifications Of Plane Continua, Steven Ray Matthews
Classifications Of Plane Continua, Steven Ray Matthews
All Graduate Plan B and other Reports, Spring 1920 to Spring 2023
In the course of studying continua in the plane it has been asked if a given continuum has uncountably many disjoint duplications in the plane, and if so, what are the consequences of the existence of such a collection. The object of this paper is to study these problems and to develop some machinery useful in their resolution. In Section I, we review the definition of convergence and homeomorphic convergence of point sets in a metric space S. We then consider the space, π of all continuous functions from a compact metric space P to a separable metric space Q …
An Argument For The Open Ocean Siting Of Coastal Thermal Electric Plants, Clarence M. Tarzwell
An Argument For The Open Ocean Siting Of Coastal Thermal Electric Plants, Clarence M. Tarzwell
United States Environmental Protection Agency: Publications
A great deal of research is yet to be done before we will definitely know all the effects of thermal electric generating plants. It is evident, however, that the chlorination of the intake water is definitely lethal to a high percentage of planktonic and other organisms; that thermal shock is detrimental to some of the more sensitive forms; that the continued exposure to high temperatures after thermal shock is lethal to many forms, especially the zooplankton; that the screening and turbulence in such plants is lethal to larval fishes and several invertebrates, and that immense amounts of waters are put …
Septic Tank Nutrients In Groundwater Entering Lake Sallie, Minnesota, David Robert Lee
Septic Tank Nutrients In Groundwater Entering Lake Sallie, Minnesota, David Robert Lee
Theses and Dissertations
The nutrient contribution of septic tanks to a lake was evaluated at Lake Sallie, in glacial outwash terrain of northwestern Minnesota. Groundwater entering the lake was collected by covering 0.258 m2 of lake bed with a bottomless cylinder vented to deflated plastic bag. Inflow velocity ranged from 0.01 to 2.5 micrometers per-second along 30% of the lakeshore. Groundwater inflow along an 800 m segment of shore amounted to 4.50 x 105 m3/year, and was uniformly distributed along the shore, but decreased exponentially away from shore.
Effluent from a heavily-used lakeside septic tank fanned out along the surface of the water …
Black Magnetic Spherules From The Glacial And Sea Ice Of Fletcher's Ice Island (T-3), Richard Scattolini
Black Magnetic Spherules From The Glacial And Sea Ice Of Fletcher's Ice Island (T-3), Richard Scattolini
Theses and Dissertations
Black magnetic spherules are particles which can be derived by ablationary processes from cosmic sources. Spherules from both the glacial ice and sea ice of Fletcher's Ice Island (T-3) were studied to determine their size distribution, sedimentation rates, and other parameters. The results were examined and shown to be similar to those of other researchers' work elsewhere.
Calculated sedimentation rates for glacial ice spherules, extrapolated for the entire earth's surface, range from 1.1 x 10⁴ to 1.1 x 10⁵ metric tons per year. Calculated sedimentation rates for sea ice spherules range from 5.0 x 10³ to 1.6 x 10⁵ metric …