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1976

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Articles 1 - 30 of 750

Full-Text Articles in Physical Sciences and Mathematics

Groundwater In The Wheatbelt, E P. O'Driscoll Dec 1976

Groundwater In The Wheatbelt, E P. O'Driscoll

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

In general six factors affect the occurence of groundwater; rainfall, topography, rock type, rock structurs, vegetation, and local evaporation.

Variation in even one of these can affect the potential yield of a bore or well, the groundwater salinity, and even whether any groundwater occurs at all.


A Proof Of Convergence For The Tridiagonal Ql Algorithm In Floating-Point Arithmetic, James George Sanderson Dec 1976

A Proof Of Convergence For The Tridiagonal Ql Algorithm In Floating-Point Arithmetic, James George Sanderson

Mathematics & Statistics ETDs

Numerous routines are available to find the eigenvalues of a real symmetric tridiagonal matrix. Since it is known to converge in exact arithmetic, the tridiagonal QL algorithm with origin shift is widely used. Here we analyze the algorithm in floating-point arithmetic. This analysis suggests two modifications to the EISPACK implementation TQLl that enable one to prove correctness and hence convergence of the routine.

Also, it is known that the implicit and explicit versions of the QL algorithm produce the same results in exact arithmetic. A counter-example to the floating-point analog of this theorem is presented.


User Services External Report, Lehigh University Dec 1976

User Services External Report, Lehigh University

Computing Center Newsletter

No abstract provided.


Disk Generators For A Raster Display Device, Norman I. Badler Dec 1976

Disk Generators For A Raster Display Device, Norman I. Badler

Technical Reports (CIS)

A simple modification of Horn's circle drawing procedure yields a disk generator for a class of graphic devices capable of drawing rectangular areas. Another variation produces a disk a scan-line at a time allowing it to be drawn at the refresh rate of the display. The calculations involve only additions and binary shifts.


(I) The Effect Of Solvent And Shift Reagents On The Proton Magnetic Resonance Spectra Of Some Cubane Derivatives (Ii) On The Mechanism Of Photodimerization Of Cyclopentadiene, Sydney Gloria White Dec 1976

(I) The Effect Of Solvent And Shift Reagents On The Proton Magnetic Resonance Spectra Of Some Cubane Derivatives (Ii) On The Mechanism Of Photodimerization Of Cyclopentadiene, Sydney Gloria White

ETD Collection for AUC Robert W. Woodruff Library

Part I of this thesis is concerned with the effect of solvent, sub stituents and the shift reagent Eu(DPM)3 on the proton magnetic resonance spectrum of several 1,4-disubstituted cubane derivatives. The chemical shift of the cubane protons is insensitive to aliphatic solvents, but there is an upfield shift of the cubane protons in benzene-d6 relative to the position in carbon tetrachloride. Electron-withdrawing substi tuents and the shift reagent induce a downfield shift for the cubane proton resonances.

Part II describes a reinvestigation of the photochemistry of cyclo pentadiene in an attempt to offer an explanation of the ...


Synthesis And Structure Of 2-Chloro-10-Phenyl-10-Thiaanthracene And 2,2'-Dichlorobithioxanthyl Disulfone, Metha Phingbodhipakkiya Dec 1976

Synthesis And Structure Of 2-Chloro-10-Phenyl-10-Thiaanthracene And 2,2'-Dichlorobithioxanthyl Disulfone, Metha Phingbodhipakkiya

ETD Collection for AUC Robert W. Woodruff Library

No abstract provided.


Tryptophan Fluorescence Studies On Turkey Liver Fructose 1,6-Bisphosphatase, Carmen Denise Quinsey Dec 1976

Tryptophan Fluorescence Studies On Turkey Liver Fructose 1,6-Bisphosphatase, Carmen Denise Quinsey

ETD Collection for AUC Robert W. Woodruff Library

The native form of turkey liver fructose 1,6-bisphosphatase (FbPase) consists of four identical subunits, each of which contains one tryptophan residue. The fluorescence emission spectra of the tryptophan residues have been recorded as a function of changes in pH, substrate (fructose 1,6-bisphosphate) and inhibitor (adenosine-5’ monophosphate) binding, and the addition of the metal cofactors Mg+2, Mn+2 and Co+2 . Changes in the fluorescence emission spectra of the tryptophan residues indicate that conformational changes in the enzyme occur under the above conditions.


Review Of Quantum States Of Atoms, Molecules And Solids, M. Eugene Rudd Dec 1976

Review Of Quantum States Of Atoms, Molecules And Solids, M. Eugene Rudd

M. Eugene Rudd Publications

The subjects of atomic, molecular and solid-state physics have only rarely been treated at an advanced level in a single volume. The notable exception, of course, is John C. Slater’s Quantum Theory of Matter. In the present book the three authors, Michael Morrison, Thomas Estle and Neal Lane, stress the unity among these fields by ernphasizing the concept of electronic quantum states in atoms, diatomic molecules and crystalline solids. Such a combination should be of basic interest to students in a variety of scientific fields and also form the basis for more advanced work in those three subjects themselves ...


Ecology Of Suspected Damaging Coyotes And Their Interactions With Domestic Poultry And Livestock, William F. Andelt Dec 1976

Ecology Of Suspected Damaging Coyotes And Their Interactions With Domestic Poultry And Livestock, William F. Andelt

Dissertations & Theses in Natural Resources

No abstract provided.


Some Simple Analytics Of Target Prices And Land Values, Duane G. Harris Dec 1976

Some Simple Analytics Of Target Prices And Land Values, Duane G. Harris

Economic Staff Paper Series

Because land Is a crucial factor of production in the U.S. agricultural sector, land prices have an impact on a wide range of participants in the world economy. Land prices have a direct impact on farmers' abilities to begin, operate, and expand their enterprises. Consumers worldwide are affected indirectly by land values because the cost of land services will partly determine the supply of farm commodities. Taxing authorities are directly affected by land value changes because property values are used as the basis for property tax assessment.


Synthetic Analogs Of The Active Sites Of Oxidized And Reduced Rubredoxin, Richard B. Frankel, G. C. Papaefthymiou, R. W. Lane, R. H. Holm Dec 1976

Synthetic Analogs Of The Active Sites Of Oxidized And Reduced Rubredoxin, Richard B. Frankel, G. C. Papaefthymiou, R. W. Lane, R. H. Holm

Physics

The bischelate monoanion [Fe((SCH2)2C6H4)2]1- contains an unconstrained, near-tetrahedral Fe(III)-S4 coordination unit (similar to the Fe-S4 coordinationunit occurring in rubredoxin proteins) and exhibits the Fe(III)/Fe(II) redox couple. Mossbauer parameters at 77 K are isomer shift δ = 0.13 mm/s (relative to iron metal) and electric quadrupole splitting ΔEQ = 0.57 mm/s. Application of an external magnetic field parallel to the direction of observation at 4.2 K induces a saturation magnetic hyperfine field of - 380 kOe. Upon reduction to the dianion ...


Model Fe(Iii) Porphyrin Systems: Axial Ligation In Oxidized Cytochrome P-450.S, G. C. Papaefthymiou, Richard B. Frankel, S. Foner, S. C. Tang, S. Koch, R. H. Holm Dec 1976

Model Fe(Iii) Porphyrin Systems: Axial Ligation In Oxidized Cytochrome P-450.S, G. C. Papaefthymiou, Richard B. Frankel, S. Foner, S. C. Tang, S. Koch, R. H. Holm

Physics

In an effort to develop useful experimental criteria to distinguish among the viable axial ligation possibilities of O, N, and S coordination in oxidized cytochrome P-450. S (substrate-bound, high-spin), syntheticmodel compounds with O-(Fe(PPIXDME) (OEt) and Fe(PPIXDME) (OC6H4NO2)) and S-(Fe(PPIXDME) (S6H4NO2) and Fe(OEP) (SPh)) donor axial ligands were prepared and studied by Mössbauer spectroscopy. Ferric hemoglobin and myoglobin were used as model compounds with N-axial coordination. The isomer shifts (δ) and quadrupole splittings (ΔEQ) observed are typical of high-spin Fe(III) porphyrins and ...


Past Levels And Present State Of Northern Victoria Land Glaciers, Paul Andrew Mayewski Dec 1976

Past Levels And Present State Of Northern Victoria Land Glaciers, Paul Andrew Mayewski

Earth Science Faculty Scholarship

Before 1973, movement of the Ross Ice Shelf had been measured near the Transantarctic Mountains (Swithinbank, 1963), near Ross Island (Stuart and Heine, 1961) and near the ice front and to the south of Roosevelt Island (Dorrer et at., 1969). Robin (1975), assuming steady state, extrapolated these data across the ice shelf by applying volume conservation principles to measured ice thickness profiles of the ice shelf.


Weathering Stages Of A Tholeiitic Basalt (Dolerite), Queen Maud Mountains, Paul Andrew Mayewski Dec 1976

Weathering Stages Of A Tholeiitic Basalt (Dolerite), Queen Maud Mountains, Paul Andrew Mayewski

Earth Science Faculty Scholarship

The sparsity of datable material and key horizons throughout most of the Transantarctic Mountains requires that much of the mapping and correlation of glacial deposits, especially moraines, be based primarily on qualitative techniques. One qualitative method is to characterize the degree of weathering of clasts covering these deposits (Behling, 1971; Calkin, 1971; Nichols, 1971; and Mayewski, 1975). Lacking, however, is a detailed understanding of the role and method of weathering. To help solve this problem, soil studies have been made by Claridge and Campbell (1968) in the Shackleton Glacier region and Everett and Behling (1968), Linkletter (1972), Behling (1971), and ...


Multi-Dimensional Clustering For Data Base Organizations, J. H. Liou, S. B. Yao Dec 1976

Multi-Dimensional Clustering For Data Base Organizations, J. H. Liou, S. B. Yao

Department of Computer Science Technical Reports

No abstract provided.


Efficient Recursive Parsing, Christoph M. Hoffmann Dec 1976

Efficient Recursive Parsing, Christoph M. Hoffmann

Department of Computer Science Technical Reports

No abstract provided.


Analysis Of A Heuristic For Full Trie Minimization, Douglas E. Comer Dec 1976

Analysis Of A Heuristic For Full Trie Minimization, Douglas E. Comer

Department of Computer Science Technical Reports

No abstract provided.


Petrology Of The Rockport Quarry Limestone (Middle Devonian Traverse Group) Alpena, Presque Isle And Montmorency Counties, Michigan, Charles Willard Cookman Dec 1976

Petrology Of The Rockport Quarry Limestone (Middle Devonian Traverse Group) Alpena, Presque Isle And Montmorency Counties, Michigan, Charles Willard Cookman

Master's Theses

The basal unit of the dominantly carbonate Traverse Group, the Bell Shale, is gradationally overlain by the Rockport Quarry Limestone which has a thickness of approximately 14 m. The Rockport Quarry Limestone is composed of a dark unrestricted marine subtidal organic-mud packstone facies, comprised of an algal-mat-bearing coral packstone subfacies and a shallower water crinoid-bryozoan grainstone subfacies; a shoal forming stromatoporoid biolithite facies; and a lagoonal micrite facies comprised of a subtidal dense subfacies containing gastropods, ostracods, and calcispheres, and an Intertidal to supratidal fenestral subfacies. The local facies tract reconstructed for the Rockport Quarry Limestone is interpreted to be ...


Graph Multiplicities, David Burns Dec 1976

Graph Multiplicities, David Burns

Master's Theses

No abstract provided.


Groundwater Levels In Nebraska, 1975, Michael J. Ellis, Darryll T. Pederson Dec 1976

Groundwater Levels In Nebraska, 1975, Michael J. Ellis, Darryll T. Pederson

Conservation and Survey Division

No abstract provided.


Biological And Chemical Evaluation Of The Aquatic Environment Of Selected Undeveloped Kentucky Lake Embayments, Marshall Gordon, Morgan E. Sisk Dec 1976

Biological And Chemical Evaluation Of The Aquatic Environment Of Selected Undeveloped Kentucky Lake Embayments, Marshall Gordon, Morgan E. Sisk

KWRRI Research Reports

This report describes research involving biological and chemical analysis of two undeveloped embayments on Kentucky Lake, namely Anderson and Vickers Bays. Field and laboratory studies were made to assess current biotic standing crops, limnological conditions, levels of inorganic and organic pollutants in the embayments.


Ultraviolet Stimulated Thermoluminescent Response Characteristics Of Aluminum Oxide, Edward Ryan Iii Dec 1976

Ultraviolet Stimulated Thermoluminescent Response Characteristics Of Aluminum Oxide, Edward Ryan Iii

Masters Theses & Specialist Projects

This investigation has demonstrated that some aluminum oxide crystals have high sensitivity and are well suited for detecting and measuring ultraviolet radiation rates significantly less than .01 µW/cm2.

The thermoluminescent glow curve, linearity of response, and fading of the crystals were determined. An action spectrum was performed to determine the relative sensitivities of several crystals in a range of wavelengths from 230 nm to 546 nm.

The sensitivity of the crystals was found to decrease as a function of exposure. \n explanation for the decrease in sensitivity due to the presence of high temperature traps is presented.

This ...


Ultraviolet Stimulated Thermoluminescent Response Characteristics Of Aluminum Oxide, Edward Ryan Dec 1976

Ultraviolet Stimulated Thermoluminescent Response Characteristics Of Aluminum Oxide, Edward Ryan

Masters Theses & Specialist Projects

This investigation has demonstrated that some aluminum oxide crystals have high sensitivity and are well suited for detecting and measuring ultraviolet radiation rates significantly less than 0.1 pW/cm2. The thermoluminescent glow curve, linearity of response, and fading of the crystals were determined. An action spectrum was performed to determine the relative sensitivities of several crystals in a range of wavelengths from 230 nm to 546 nm. The sensitivity of the crystals was found to decrease as a function of exposure. An explanation for the decrease in sensitivity due to the presence of high temperature traps is presented. This ...


Delineation Of A Wave Climate For Dam Neck, Virginia Beach, Virginia, Andrew L. Gutman Dec 1976

Delineation Of A Wave Climate For Dam Neck, Virginia Beach, Virginia, Andrew L. Gutman

Reports

No abstract provided.


Leaf Epidermal Transmittance Of Ultraviolet Radiation And Its Implication For Plant Sensitivity To Ultraviolet-Radiation Injury, Ronald Robberecht Dec 1976

Leaf Epidermal Transmittance Of Ultraviolet Radiation And Its Implication For Plant Sensitivity To Ultraviolet-Radiation Injury, Ronald Robberecht

All Graduate Theses and Dissertations

Leaf epidermal transmittance of ultraviolet radiation (280-400 nm) was examined in several plant species to determine the capability of the epidermis to attenuate solar ultraviolet radiation. Epidermal samples were mechanically isolated and examined with a spectroradiometer/integrating sphere for transmittance. A survey of 25 species exposed to natural insolation was conducted. Although the species differed in life form, habitat type, and epidermal characteristics, epidermal transmittance was generally less than 10%. Ultraviolet radiation was attenuated 95 to 99% in more than half of the species. In 16 species, flavonoid and related pigments in the epidermis accounted for 20 to 57% of ...


Experiments On The Attenuation Of Third Sound In Saturated Superfluid Helium Films, Robert Hallock, K. L. Telschow, R. K. Galkiewicz Nov 1976

Experiments On The Attenuation Of Third Sound In Saturated Superfluid Helium Films, Robert Hallock, K. L. Telschow, R. K. Galkiewicz

Robert Hallock

Upper limits of the attenuation of third sound in saturated superfluid 4He films have been measured in three separate experiments. Our observations at frequencies from 0.1 to 200 Hz indicate that the attenuation in these thick films is substantially lower than would be inferred from the only previous experiment done on saturated films. We observe the third-sound velocity to have the temperature dependence predicted by Bergman.


Piezomodulated And Specular Reflection Spectra Of A Polydiacetylene Crystal, Craig J. Eckhardt, H. Muller, J. Tylicki, R.R. Chance Nov 1976

Piezomodulated And Specular Reflection Spectra Of A Polydiacetylene Crystal, Craig J. Eckhardt, H. Muller, J. Tylicki, R.R. Chance

Craig J. Eckhardt Publications

A class of potential quasi-one-dimensional organic conductors is the monocrystalline polydiacetylenes. These polymers can be obtained as single crystals that have high structural perfection and a chain configuration that permits extensive π-electron delocalization. The poly-2, 4-hexadiyne-1, 6-diol-bis-(p-toluene sulfonate) (PTS) has been the most extensively studied system and interest centers upon the extent of delocalization along the two chains compromising the P21/c unit cell.


Chlorine Distribution In The Idaho Batholith, Laurence Stewart Istas Nov 1976

Chlorine Distribution In The Idaho Batholith, Laurence Stewart Istas

Dissertations and Theses

The expected concentration of chlorine in the biotite fraction was not found. The chlorine was not significantly water leachable from the whole rock samples following normal grinding. The Idaho Batholith as a source for mineralizing chlorine was not established.

The chlorine distribution supports, but does not prove, a metamorphic origin for the Idaho Batholith. Cretaceous and possibly tertiary thermal events may have homogenized the chlorine in the batholith. Since chlorine seems to be so widely available in source rocks, a better way to correlate its presence to mineralization would be to study the residual chlorine from the ore deposition process.


Protecting Ripening Sorghum With Methiocarb From Bird Damage In Senegal, Richard L. Bruggers Nov 1976

Protecting Ripening Sorghum With Methiocarb From Bird Damage In Senegal, Richard L. Bruggers

Bird Control Seminars Proceedings

The simultaneous completion of the rainy season and nesting of granivorous birds between October and November in the Sudano-sahelian region of Senegal often results in very extensive bird damage to cereal crops. This occurs from both increased bird populations, due to the presence of juveniles as well as from their accompanying change in diet from insects to seeds. The damage is caused by several species of birds, most notable the Red-billed Dioch (Quelea quelea) and the Village and Black-headed Weavers (Ploceus cuculiatus and Ploceus capitalis) . The Buffalo Weaver (Bubalornis albirostris) and the Glossy Starling Lamprotornis chalybaeus) also are at times ...


Experimental Use Of Av-Alarm For Repelling Quelea From Rice In Somalia, Larry C. Holcomb Nov 1976

Experimental Use Of Av-Alarm For Repelling Quelea From Rice In Somalia, Larry C. Holcomb

Bird Control Seminars Proceedings

The Av-Alarm is a device for producing loud intermittent sounds which are sometimes effective in repelling pest birds or mammals. (Av-Alarm is manufactured by Av-Alarm Corp, P.O. Box 2488, Santa Maria, California 93454.) The sound is intended to irritate or cause anxiety in animals, perhaps by interfering with normal sound communication sufficiently to repel them from the area. Boudreau(1972) and Stewart (1974) report factors relating to alarm stimuli in bird control. Stewart (1974), HcCracken (1972) and Palmer (1976) reported the use of Av-Alarm in repelling pests under several different situations. However, Jeffrey Jackson (pers. comm.) has reported the ...