Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

Discipline
Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 287761 - 287790 of 303070

Full-Text Articles in Physical Sciences and Mathematics

Semiclassical Calculations Of Vibrational Energy Levels For Non-Separable Systems Using The Birkhoff-Gustavson Normal Form, Randall T. Swimm, John B. Delos Jan 1979

Semiclassical Calculations Of Vibrational Energy Levels For Non-Separable Systems Using The Birkhoff-Gustavson Normal Form, Randall T. Swimm, John B. Delos

Arts & Sciences Articles

We present a semiclassical method of calculating vibrational energy levels for a system of nonseparable coupled oscillators. For a Hamiltonian written as a power series in which the leading terms are given by a sum of one‐dimensional harmonic oscillator Hamiltonians, the method involves transforming the original classical Hamiltonian via a succession of canonical transformations into a normal form which is a power series originally defined by Birkhoff and later generalized by Gustavson. Two cases are distinguished. If the harmonic oscillator frequencies in the unperturbed Hamiltonian are incommensurable, then the normal form is a power series whose terms are products of …

Go to article

Phosphorus Sources Trials, J W. Bowden, M Baker Jan 1979

Phosphorus Sources Trials, J W. Bowden, M Baker

Experimental Summaries - Plant Research

Pasture Trials 76BU1 New land pasture at Yallingupo Sand over laterite. 75N07B New land pasture at Chittering. Grave lo 76MT10 New land pasture at Mount Barker. Gravel. 77MT1 New land pasture at Mount Barkero Methods and particle size. Cropping Trials 76N4 New land - Phosphorus sources on barley - gravel sitee 76LG6 Short history - Phosphorus sources on barley - gravelly sande 76WH9 New land Phosphorus sources on wheat - loamy sands 77M016 - New land - Phosphorus sources on wheat - gravel ~ 3rd crop.

Go to article

Tri̇assi̇c On The Western Si̇de Of Bosphorus (Ki̇lyos, İstanbul): A Recent Discover, Orhan Kaya, Maurice Lys Jan 1979

Tri̇assi̇c On The Western Si̇de Of Bosphorus (Ki̇lyos, İstanbul): A Recent Discover, Orhan Kaya, Maurice Lys

Bulletin of the Mineral Research and Exploration

No abstract provided.

Go to article

Fossi̇l Coprolites Of Turkey, İbrahim Tekkaya Jan 1979

Fossi̇l Coprolites Of Turkey, İbrahim Tekkaya

Bulletin of the Mineral Research and Exploration

No abstract provided.

Go to article

Age Of The Çaldağ Li̇mestone Of The Haymana - Polatli Basin, Engin Meri̇ç, Naci Görür Jan 1979

Age Of The Çaldağ Li̇mestone Of The Haymana - Polatli Basin, Engin Meri̇ç, Naci Görür

Bulletin of the Mineral Research and Exploration

No abstract provided.

Go to article

Hydrogeological Study Of Bulamaçli Thermal Water Source, In Kirşehi̇r, Çi̇çekdaği, Baki Cani̇k Jan 1979

Hydrogeological Study Of Bulamaçli Thermal Water Source, In Kirşehi̇r, Çi̇çekdaği, Baki Cani̇k

Bulletin of the Mineral Research and Exploration

No abstract provided.

Go to article

New Findings On The Mining Hi̇story Of Turkey Around Tokat Regi̇on, Ergün Kaptan Jan 1979

New Findings On The Mining Hi̇story Of Turkey Around Tokat Regi̇on, Ergün Kaptan

Bulletin of the Mineral Research and Exploration

No abstract provided.

Go to article

An Arithmetic Computer Approach To Gas Dynamical Modeling, Donald Greenspan, Aspi Rustom Wadia Jan 1979

An Arithmetic Computer Approach To Gas Dynamical Modeling, Donald Greenspan, Aspi Rustom Wadia

Mathematics Technical Papers

Unsteady, two dimensional internal and external flows are analyzed using an arithmetic n-body formulation. A Lagrangian approach is used to study the internal shock formation in a shock tube and the external flows over a circular cyclinder, a flat plate and an airfoil. Viable physical mechanisms of the shock and boundary layer formation and of flow separation are developed. This approach results in a computer simulation of a wind tunnel in which arbitrarily shaped bodies can be studied. Extensive computer examples are described for which agreement with experimental data is good for all cases in which the damping of the …

Go to article

Parameter Estimation In Illness-Death Processes: Preinfaractional Angina, Jerome Eisenfeld, B. Canada Jan 1979

Parameter Estimation In Illness-Death Processes: Preinfaractional Angina, Jerome Eisenfeld, B. Canada

Mathematics Technical Papers

An illness-death process is an absorbing Markov process where the illness states from the transient states of the process. This paper deals with the estimation of illness-death parameters from survivor data. The parameters of interest include the probabilities of recovery, relapse and death and mean residence times. The estimation problem is considered from the point of view of the theory of structural identifiability in compartmental analysis. As a prototypical example, we consider published data on preinfarctional angina.

Go to article

Potential Use Of Hydroelectric Facilities For Manipulating The Fertility Of Lake Mead, Larry J. Paulson, John R. Baker, James E. Deacon Jan 1979

Potential Use Of Hydroelectric Facilities For Manipulating The Fertility Of Lake Mead, Larry J. Paulson, John R. Baker, James E. Deacon

Publications (WR)

Analysis of historical nutrient data for Lake Mead indicates that the fertility of the reservoir has decreased which may be the cause for a corresponding decline in the largemouth bass population. However, it appears that fertility can be manipulated by altering the operation of the dam. The depletion of nutrients in the euphotic zone by phytoplankton and subsequent accumulation in the hypolimnion during summer and fall provide a natural nutrient gradient from which water of varying fertility can be drawn for discharge. This combined with alterations in the depth or seasonal pattern of discharge can possibly be used to enhance …

Go to article

Special Reflectance Of Hydrophytes, Robert G. Best Jan 1979

Special Reflectance Of Hydrophytes, Robert G. Best

Electronic Theses and Dissertations

Identification of hydrophytes will improve the delineation and classification of wetlands on remotely sensed imagery. Spectral reflectance measurements of 10 species of hydrophytes were made with an Exotach radiometer during three phenological stages, flowering and early seed, senescence, and early emergent. Reflectance data were analyzed to determine significant (≥.95) reflectance differences between species in each of four spectral regions during each phenological stage. Eight species had significantly (≥.95) different reflectances during the flower and early seed stage. Only one species could not be spectrally separated during at least one phenological stage. The results indicate that films sensitive to both visible …

Go to article

Population And Productivity Of A Flock Of Giant Canada Geese In Northeastern South Dakota, Ted A. Clausing Jan 1979

Population And Productivity Of A Flock Of Giant Canada Geese In Northeastern South Dakota, Ted A. Clausing

Electronic Theses and Dissertations

Population and productivity studies of giant Canada geese (Branta canadensis maxima) were conducted in northeastern South Dakota in 1976 and 1977. One hundred ninety-three of 436 randomly selected sample quarter sections on the 5,459 km2 area contained potential goose nesting habitat in 1976. Forty-six pairs, 6 indicated pairs, and 6 single geese were found on these 193 quarter sections during the 1977 nesting season. The population was estimated to be 1,880 geese. Recommendations were to continue aerial surveys in the spring and late summer and to supplement them with annual searches of the sample quarter sections used in this study. …

Go to article

Breeding Waterfowl Use Of Intermittent Streams, Mchenry County, North Dakota, Daniel E. Hubbard Jan 1979

Breeding Waterfowl Use Of Intermittent Streams, Mchenry County, North Dakota, Daniel E. Hubbard

Electronic Theses and Dissertations

Thirty-three 425 m segments of 4 intermittent streams in north central North Dakota were censured for breeding pairs of waterfowl in 1977 and 1978. Pair count data were available for 1976. Emphasis of this study was placed on the narrow meandering portions of the streams. High dabbling duck (Anas spp.) densities were observed in 1977 and 1978; 6.11 pairs per ha and 5.60 pairs per ha, respectively, for the first census of each year. Accepting blue-winged teal (A. discors), numbers of dabbler pairs were similar in 1976 and 1978. Dry conditions in 1977 caused lower numbers of all species of …

Go to article

Expectation Of Genetic Alteration Of Muscle Composition And Growth Traits In Rainbow Trout (Salmo Gairdneri), George W. Partelow Jan 1979

Expectation Of Genetic Alteration Of Muscle Composition And Growth Traits In Rainbow Trout (Salmo Gairdneri), George W. Partelow

Electronic Theses and Dissertations

The breeding of farm animals to produce superior organisms has been extensively applied to many parts of the world. Much of the research has been concerned with the manip0ulation of muscle protein and fat in muscle tissue for the purpose of catering to human needs (Kielanowski 1972; Dinkel and Busch 1973; Olson et. al. 1976). Though fishes are able to convert food to quality protein more efficiently than most animals, they have been underutilized as a protein source in the United States. Until recently, genetic manipulation through selection to enhance their quality has not been extensively applied (Smith and Rumsey …

Go to article

Non-Game Bird Habitat Associated With Haul Roads And Surface Mining For Bentonite Clay, Tim A. Schaid Jan 1979

Non-Game Bird Habitat Associated With Haul Roads And Surface Mining For Bentonite Clay, Tim A. Schaid

Electronic Theses and Dissertations

A 2 year study was conducted to investigate possible differences in density and diversity of birds in relation to distance from mining haul roads and various aged mine spoils. Winter bird surveys and breeding bird counts were conducted during 1977 and 1978. Bird density and diversity were estimated and compared between the following habitat areas: old spoils (mined ≥20 years ago, unreclaimed), new spoils (mined ≤20 years ago, reclaimed) and unmined areas. Within unmined areas density and diversity of birds 100m, 300m, 500m, and 900m from a mining haul road were compared to detect differences in density and diversity with …

Go to article

The Modification And Use Of An Electron Paramagnetic Resonance Spectrometer For Data Collection At Liquid Nitrogen Temperature, Vernon Lee Baumberger Jan 1979

The Modification And Use Of An Electron Paramagnetic Resonance Spectrometer For Data Collection At Liquid Nitrogen Temperature, Vernon Lee Baumberger

Electronic Theses and Dissertations

The scope of this study includes the modification of an EPR spectrometer for acquisition of low temperature data. The modification involved adaptation of the system for use with a cylindrical cavity specifically designed for low temperature operation. This modification increased the capability of the present system for data collection at liquid nitrogen temperature and gave such greater stability than the rectangular cavity previously used. A comparison was made of signal to noise for the two cavities. This study showed a somewhat greater signal to noise ratio for the low temperature cylindrical cavity. Operation at low temperature also allowed the observation …

Go to article

Assessment Of Design Alternatives: Proposed Relocation Of Rainbow Marina, Glen Canyon National Recreation Area, Utah-Arizona, Philip E. Flores Associates, Inc. Jan 1979

Assessment Of Design Alternatives: Proposed Relocation Of Rainbow Marina, Glen Canyon National Recreation Area, Utah-Arizona, Philip E. Flores Associates, Inc.

Elusive Documents

No abstract provided.

Go to article

Granting The Consent Of Congress To The Amended Bear River Compact Between The States Of Utah, Wyoming And Idaho, Mr. Bayh, Mr. Kennedy Jan 1979

Granting The Consent Of Congress To The Amended Bear River Compact Between The States Of Utah, Wyoming And Idaho, Mr. Bayh, Mr. Kennedy

Elusive Documents

No abstract provided.

Go to article

Meteorology Of Major Storms In Western Colorado And Eastern Utah, U.S. Department Of Commerce Jan 1979

Meteorology Of Major Storms In Western Colorado And Eastern Utah, U.S. Department Of Commerce

Elusive Documents

No abstract provided.

Go to article

Distribution Of Phytoplankton In Utah Lakes, L. R. Williams, S. C. Hern, V. W. Lambou, F. A. Morris, M. K. Morris, W. D. Taylor Jan 1979

Distribution Of Phytoplankton In Utah Lakes, L. R. Williams, S. C. Hern, V. W. Lambou, F. A. Morris, M. K. Morris, W. D. Taylor

Elusive Documents

No abstract provided.

Go to article

Effect Of Displaced Geomagnetic And Geographic Poles On High-Latitude Plasma Convection And Ionospheric Depletions, Jan Josef Sojka, W. J. Raitt, Robert W. Schunk Jan 1979

Effect Of Displaced Geomagnetic And Geographic Poles On High-Latitude Plasma Convection And Ionospheric Depletions, Jan Josef Sojka, W. J. Raitt, Robert W. Schunk

All Physics Faculty Publications

We assumed that the ionospheric plasma at high latitudes has a tendency to corotate about the geographic pole and that magnetospheric convection is relative to the geomagnetic pole. With this assumption we calculated plasma drift patterns over the polar cap for a range of constant magnetospheric electric fields as well as for asymmetric electric fields with enhanced plasma flow on either the dawnside or the duskside of the polar cap. We calculated the drift patterns in both the geographic inertial and the geomagnetic inertial frame taking into account the displacement between the geographic and geomagnetic poles. We found that this …

Go to article

High Latitude Plasma Convection: Predictions For Eiscat And Sondre Stromfjord, Jan Josef Sojka, W. John Raitt, Robert W. Schunk Jan 1979

High Latitude Plasma Convection: Predictions For Eiscat And Sondre Stromfjord, Jan Josef Sojka, W. John Raitt, Robert W. Schunk

All Physics Faculty Publications

We have used a plasma convection model to predict diurnal patterns of horizontal drift velocities in the vicinity of the EISCAT incoherent scatter facility at Tromso, Norway and for Sondre Stromfjord, Greenland, a proposed new incoherent scatter facility site. The convection model includes the offset of 11.4° between the geographic and geomagnetic poles (northern hemisphere), the tendency of plasma to corotate about the geographic pole, and a magnetospheric electric field mapped to a circle about a center offset by 5° in the antisunward direction from the magnetic pole. Four different magnetospheric electric field configurations were considered, including a constant cross‐ …

Go to article

Heat Content Of Bark, Twigs, And Foliage Of Nine Species Of Western Conifers, United States Department Of Agriculture, Forest Service Jan 1979

Heat Content Of Bark, Twigs, And Foliage Of Nine Species Of Western Conifers, United States Department Of Agriculture, Forest Service

Forestry

Comparative combustion tests showed that bark, twigs, and foliage of nine commercial timber species in the Northern Rocky Mountains generally produce more heat than equal volumes of their ovendry wood and that these parts of harvested trees could be profitably utilized as a source of energy.

Go to article

Sucker Regeneration In A Utah Aspen Clone After Clearcutting, Partial Cutting, Scarification, And Girdling, United States Department Of Agriculture, Forest Service Jan 1979

Sucker Regeneration In A Utah Aspen Clone After Clearcutting, Partial Cutting, Scarification, And Girdling, United States Department Of Agriculture, Forest Service

Forestry

Clearcutting, partial cutting, scarification, and girdling were used to stimulate root suckering in a Utah aspen clone. Regeneration was inventoried yearly during the first 4 years after treatment and again after 12 years. Clearcutting resulted in the greatest number of suckers. In most years, partial cuts (cuts that removed 67 percent of the basal area) had less than 50 percent as much regeneration as the clearcut plots. Girdling stimulated suckering to a lesser degree than cutting. Mortality was high on girdled plots and by the 12th year after treatment few suckers had survived. Scarification had no apparent effect on sucker …

Go to article

Influence Of Some Environmental Factors On Initial Establishment And Growth Of Ponderosa Pine Seedlings, United States Department Of Agriculture, Forest Service Jan 1979

Influence Of Some Environmental Factors On Initial Establishment And Growth Of Ponderosa Pine Seedlings, United States Department Of Agriculture, Forest Service

Forestry

Study plots were established to determine the effects of various environmental factors on ponderosa pine seed germination and initial seedling establishment and growth. A series of soil surface treatments were performed on plots in two locations: within or under the influence of overstory pine trees and in openings away from the pine influence. Seed germination was significantly greater in the opening plots. The overstory canopy and forest floor restricted the amounts of precipitation, light, and heat reaching the soil and probably decreased germination. Cutworms, birds, and small mammals caused the greatest seedling mortality. The largest seedlings occurred in the fire-treated …

Go to article

Quaking Aspen - Seed Germination And Early Seedling Growth, United States Department Of Agriculture, Forest Service Jan 1979

Quaking Aspen - Seed Germination And Early Seedling Growth, United States Department Of Agriculture, Forest Service

Forestry

The suckering of aspen (Populus tremuliodes Michx.) as a highly effective means of vegetative propagation is well known and has been widely studied (Baker 1918; Day 1944; Maini 1967; Schier 1974). Less is known about seed propagation, sometimes viewed as having only minor importance because early research (Baker 1918) had indicated that rare seedling establishment was due to low or nonexistent germinability.

Go to article

A Search For Phytotoxins Influencing Germination And Early Growth Of Ponderosa Pine, United States Department Of Agriculture, Forest Service Jan 1979

A Search For Phytotoxins Influencing Germination And Early Growth Of Ponderosa Pine, United States Department Of Agriculture, Forest Service

Forestry

A series of laboratory and field experiments were conducted to determine if mature ponderosa pines produce a substance (phytotoxin) that inhibits the germination and growth of seedlings directly under the tree crown. Neither live nor dead materials collected from ponderosa pines produced either volatile or water-soluble phytotoxins that drastically inhibited germination of seeds or growth of seedlings. Seed overwintering beneath the canopy of mature pine, or planted in soils collected there, showed reduced germination. Exact cause of the reduction was not determined. If weak phytotoxins were responsible, they did not inhibit growth of seedlings that germinated.

Go to article

Nutrient Losses From Timber Harvesting In A Larch/Douglas-Fir Forest, United States Department Of Agriculture, Forest Service Jan 1979

Nutrient Losses From Timber Harvesting In A Larch/Douglas-Fir Forest, United States Department Of Agriculture, Forest Service

Forestry

Nutrient levels as a result of experimental clearcutting, shelterwood cutting, and group selection cutting--each with three levels of harvesting intensity--were studied in a larch-fir forest in northwest Montana, experimentally logged with a skyline system. None of the treatments altered nutrient levels in an intermittent stream, nor were excessive amounts of nutrients lost in soil below the root zone. Under conditions on this site, skyline logging did not result in surface erosion or nutrient losses that would affect forest management.

Go to article

Fire Behavior In Nonuniform Fuels, United States Department Of Agriculture, Forest Service Jan 1979

Fire Behavior In Nonuniform Fuels, United States Department Of Agriculture, Forest Service

Wildfires

For the purposes of this study, nonuniform fire behavior is predicted by modeling fire spread through a hexagonal network of fuel cells. Fire spread is assumed to be a process of contagious growth between cells. Fuel properties are allowed to vary from cell to cell in a prescribed manner but have uniform properties within the cell. Consequently, the nonuniformity of the actual fuel array is simulated through cell to cell variations and has a resolution limited by the cell size. Because of the nature of the modeling process, it is necessary to devise a scheme for collecting data describing nonuniformity …

Go to article

Fire - Decay: Interactive Roles Regulating Wood Accumulation And Soil Development In The Northern Rocky Mountains, United States Department Of Agriculture, Forest Service Jan 1979

Fire - Decay: Interactive Roles Regulating Wood Accumulation And Soil Development In The Northern Rocky Mountains, United States Department Of Agriculture, Forest Service

Wildfires

Decay and fire play interactive roles in recycling wood and other organic materials in forest ecosystems, and contribute to the development of high quality soils in the Northern Rocky Mountains. Decayed wood, charcoal, and other decomposed organic matter are the principal media for ectomycorrhizal and nonsymbiotic nitrogen fixing microbes. The activities of these microbes are critical to the growth of forest trees. The balance between decay and fire, as it affects the amount, distribution, and type of organic matter, controls the ability of forest soils to support the growth of trees.

Go to article

First Prev Next Last