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Articles 51241 - 51270 of 52381

Full-Text Articles in Physical Sciences and Mathematics

The Effect Of Las Vegas Wash Effluent Upon The Water Quality In Lake Mead, D. A. Hoffman, P. R. Tramutt, F. C. Heller, Bureau Of Reclamation Jan 1971

The Effect Of Las Vegas Wash Effluent Upon The Water Quality In Lake Mead, D. A. Hoffman, P. R. Tramutt, F. C. Heller, Bureau Of Reclamation

Publications (WR)

This study developed from observations made during an earlier study on Lake Mead which was reported in CHE-70, Water Quality Study of Lake Mead. Results from that study indicated that poor-quality water was flowing into the Las Vegas Bay reach of Boulder Basin, Lake Mead. Also reports of deteriorating water quality, resulting in taste and odors in domestic water supplies taken from Boulder Basin as well as a reduction in the attractiveness of Las Vegas Bay for recreational uses caused by aquatic plants and algae blooms, indicated a need for a concentrated study concerning the effects of flows from Las …

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Effects Of Chick Stimuli And Dieldrin On Adoptive Behavior Of Penned Hen Pheasants, K. L. Cool Jan 1971

Effects Of Chick Stimuli And Dieldrin On Adoptive Behavior Of Penned Hen Pheasants, K. L. Cool

Electronic Theses and Dissertations

Studies to determine the effect of chick stimuli and dieldrin on adoptive behavior of penned hen pheasants were conducted in 1969 and 1970. Results indicated that whether caged hens saw or heard chicks had no effect on adoption or killing of chicks. Hens receiving sound stimuli and sight-and-sound stimuli from chicks responded similarly to hens receiving no stimuli. Sub-lethal doses of dieldrin also had no effect on chick adoption under the conditions of this study. Results demonstrated that non-incubating pheasant hens will adopt and brood orphan chicks. During the 2 years of the study, respectively, 37 and 49 percent of …

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Food Habits Of Black Crappies, White Crappies, Yellow Perch And White Suckers In A Small Impoundment In Northeastern South Dakota, Dennis Unkenholz Jan 1971

Food Habits Of Black Crappies, White Crappies, Yellow Perch And White Suckers In A Small Impoundment In Northeastern South Dakota, Dennis Unkenholz

Electronic Theses and Dissertations

Crustaceans, aquatic insects and fish were the most important food items found in stomach samples. Black crappies depended on zooplankton and aquatic insects as their major food source as they occurred in all samples and were major food items in 70 percent and 40 percent respectively. Insects, zooplankton and fish were the major food items of white crappies. Insects were the dominant forage present in 54 percent of the samples while zooplankton and fish were dominant in 36 percent and 21 percent of the samples respectively. Perch relied on crayfish, fish and aquatic insects as their major food source. Aquatic …

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Population Dynamics Of The Mourning Dove In South Dakota, Leslie A. Rice Jan 1971

Population Dynamics Of The Mourning Dove In South Dakota, Leslie A. Rice

Electronic Theses and Dissertations

Mourning dove bandings in South Dakota totaled 44,842 from 1917 through 1970. Adult bandings totaled 44.4 percent of all bandings while immatures, juveniles, locals, and unknown age were 41.3, 0.8, 12.8, and 0.7 percent, respectively. Recoveries totaled 2.8 percent of the banded population, 2.5 percent from hunting and 0.5 percent from non-hunting. Annual mortality estimates of local (nestling) bandings from 1956-61 were between 54.4 and 64.5 percent. Subsequent adult mortality from local bandings was between 51.0 and 52.4 percent. Mean annuals mortality estimates of flying doves banded from 1964-69 were calculated using composite dynamic, composite time-specific, relative recovery rate, a …

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Food Habits Of Deer In The Southern Black Hills As Determined By The Point Technique, Theron E. Schenck Jan 1971

Food Habits Of Deer In The Southern Black Hills As Determined By The Point Technique, Theron E. Schenck

Electronic Theses and Dissertations

White-tailed (Odocoileus virginianus) and mule deer (Odocoileus hemionius) were collected in 1968 and 1969 for a study of food habits. Rumen contents were analyzed by use of the point-analysis technique and weights. This is the first food habits study from the southern Black Hills and is necessary for proper deer management. To evaluate the suitability of the point technique for Black Hills vegetation, an artificial population was constructed from known weights of a forb, (Achillea lanulosa), grass (Oryzopsis asperfoliz), rose (Rosa sp.), kinnikinnick (Arctostaphylos uva-ursi), and ponderosa pine (Pinus ponderosa). Each population was tested with 100-point trails and 200-point trials. …

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A Clinico-Pathologic Study Of Botulism In Ring-Necked Pheasants, Hazel J. Shave Jan 1971

A Clinico-Pathologic Study Of Botulism In Ring-Necked Pheasants, Hazel J. Shave

Electronic Theses and Dissertations

Toxins were produced from 6 strains of Cl. Botulinum, 2 of which killed pheasants. Inoculated birds were observed and a description of the progression of signs of the disease is given. Juvenile pheasants were inoculated with Types A and C toxin intramuscularly and were given the toxin orally. These birds were observed and their clinical signs noted. Adult pheasants were inoculated with toxoid prepared from type C toxin and commercial toxoid; injections were repeated in 21 days. Fourteen days following the final injection, the birds were challenged with toxin. Those protected with toxoid survived, while those receiving saline succumbed. Gross …

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Macroscopic Benthos Populations And Taxonomy Of The Family Chironomidae In Lake Poinsett, South Dakota, Stephen B. Smith Jan 1971

Macroscopic Benthos Populations And Taxonomy Of The Family Chironomidae In Lake Poinsett, South Dakota, Stephen B. Smith

Electronic Theses and Dissertations

Benthos samples were collected in Lake Poinsett, a highly eutrophic eastern South Dakota lake, from March 1970 through February 1971. The lake bottom was divided into three substrate types (sand, sand-sapropel mixture and sapropel) and the percent of each substrate type was calculated. Nineteen macroscopic genera were taken from ten sampling stations located throughout the lake. Descriptions are presented for organisms in this group. Diversity of organisms was greatest in the sand substrates, in that all 19 genera were collected. Chironomus spp. (Chironomus plomosus, Chironomus attenuates and six unidentified species) was the most abundant group of organisms and occurred most …

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Yield And Composition Of Utah's Range Sites, Lamar R. Mason Jan 1971

Yield And Composition Of Utah's Range Sites, Lamar R. Mason

Elusive Documents

No abstract provided.

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Development Of Cold Cloud Seeding Technology For Use In Precipitation Management, Charles F. Chappell, Joel E. Fletcher, George W. Reynolds, William N. Mcneill, Ronald Campbell Jan 1971

Development Of Cold Cloud Seeding Technology For Use In Precipitation Management, Charles F. Chappell, Joel E. Fletcher, George W. Reynolds, William N. Mcneill, Ronald Campbell

Reports

This is a report of the world accomplished and results obtained under a 2-year contract. The primary objective of the Wasatch Weather Modification Project is to assess the effectiveness of selected procedures for increasing the water supply in the Wasatch Mountains by cloud seeding. As part of this overall objective, an airborne seeding experiment has been conducted for two winter seasons. Preliminary results of this experiment indicate a positive seeding effect within and on the periphery of the designated target area. A summary of project designs, procedures, and problems encountered is also included. Data processing, editing, analysis and display procedures, …

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Hybrid Computer Simulation Of The Accumulation And Melt Processes In A Snowpack, Keith O. Eggleston, Eugene K. Israelsen, J. Paul Riley Jan 1971

Hybrid Computer Simulation Of The Accumulation And Melt Processes In A Snowpack, Keith O. Eggleston, Eugene K. Israelsen, J. Paul Riley

Reports

This study represents the first phase of an investigation to develop an operational simulation model of the point snowmelt process based on a time increment of one day or less. Mathematical relationships for various phenomena involved in the snowmelt process were proposed and tested. These relationships were combined into a model which is applicable to any geographic locations by determining appropriate constants for certain relationships. The model was synthesized on a hybrid computer and calibrated using field data from the Central Sierra Snow Laboratory. It was then tested with data from other well instrumented locations. Sensitivity tests were also conducted …

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Inverse Solutions To Three-Dimensional Free Surface Potential Flows, Roland W. Jeppson Jan 1971

Inverse Solutions To Three-Dimensional Free Surface Potential Flows, Roland W. Jeppson

Reports

Methods are developed and defined for obtaining numerical solutions to three-dimensional, free surface, invisvid, incompressible fluid flows and three-dimensional free surface Darcian flow in porous media. Since those boundaries consisting of free surface are unknown a priori, a solution to the space boundary value problem resulting from a formulation in the physical space is very difficult, if not impossible, to obtain. Consequently, the methods described herein are based on a formulation in a space defined by a potential function and two mutually orthogonal stream surfaces whose intersections define the streamlines of the flow. In this space the positions of free …

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The Detection Of Magnetic Fields Caused By Groundwater, Duane G. Chadwick, Larry Jensen Jan 1971

The Detection Of Magnetic Fields Caused By Groundwater, Duane G. Chadwick, Larry Jensen

Reports

Perturbations on the earth’s magnetic field may coincide with the existence of groundwater. Theoretical calculations are made showing how and to what extent this effect may exist. The suggestion is also made that water dowsers may get a dowsing reaction as a result of entering a change in magnetic gradient. Tests were conducted to determine the statistical significance of dowsing reactions obtained by separate individuals dowsing in a common test area. Approximately 150 people participated in the experiment over a period of one year. Chi-square tests showed considerable statistical significance. Virtually all people tested experienced dowsing reactions though most of …

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Hydrologic Inventory Of The Great Salt Lake Desert Area, Gary L. Foote, Robert W. Hill, Daniel H. Hoggan Jan 1971

Hydrologic Inventory Of The Great Salt Lake Desert Area, Gary L. Foote, Robert W. Hill, Daniel H. Hoggan

Reports

The Great Salt Lake Desert, located in the southwest corner of the State of Utah"is a very dry region with sparse population and relatively small scattered areas of development. Since only a meager amount of hydrologic data has been collected and compiled for this relatively undeveloped area, the inventory presented herein is but a general appraisal of hydrologic conditions. Because of the small amount of development that has taken place and the general lack of hydrologic data, a water budget analysis is included for the Tooele Valley only.

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Further Studies Of The Optimum Operation Of Desalting Plants As A Supplemental Source Of Firm Yield, Calvin G. Clyde, Wesley H. Blood Jan 1971

Further Studies Of The Optimum Operation Of Desalting Plants As A Supplemental Source Of Firm Yield, Calvin G. Clyde, Wesley H. Blood

Reports

The Operating Rule Program was developed in an earlier study to furnish a means to determine optimum desalting plant size, optimal operating rule, and costs of operating in conjunction with existing water supply systems, under the present study, five further objectives were accomplished: (1) The program was applied to a New York City water supply system feasibility study in connection with a dual purpose nuclear power plant to develop costs for adding firm yield to the New York City water supply system in conjunctive operation with the desalting plant. (2) The program was modified to enable assessment of stage construction …

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Finite Difference Solutions Of Axisymmetric Infiltration Through Partially Saturated Porous Media, Chi-Yuan Wei, Roland W. Jeppson Jan 1971

Finite Difference Solutions Of Axisymmetric Infiltration Through Partially Saturated Porous Media, Chi-Yuan Wei, Roland W. Jeppson

Reports

Solutions are obtained to the problem of steady-state partially saturated infiltration of moisture applied over a horizontal source circle which moved through homogeneous soils toward a water table. A commonly accepted relationship between relative permeability and capillary pressure has been utilized in conjunction wit Darcy’s law to formulate the mathematical model. The solutions have utilized an inverse formulation and have been obtained by finite difference. The inverse formulation considers the magnitudes of the cylindrical coordinates r and z as the dependent variables and the potential function and the Stokes’ stream function as the independent variables (i.e the problem is solved …

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Correspondence On Home Range Determination For Small Mammals, F.B. Turner, R.D. Anderson, D.F. Balph Jan 1971

Correspondence On Home Range Determination For Small Mammals, F.B. Turner, R.D. Anderson, D.F. Balph

Memorandum

No abstract provided.

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Aphids Of Curlew Valley, George F. Knowlton Jan 1971

Aphids Of Curlew Valley, George F. Knowlton

Memorandum

No abstract provided.

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Anclote Environmental Project Report 1970, Marine Science Institue, University Ofsouth Florida Jan 1971

Anclote Environmental Project Report 1970, Marine Science Institue, University Ofsouth Florida

Reports

A comprehensive environmental study involves lengthy and complex research and this report presents results which are preliminary in nature. The sampling period was limited to the fall (September-November) of 1970 in an area which shows marked seasonality. The results however represent a considerable body of information on the Anclote environment and valuable conclusions can be drawn from them. Included in the reports of each sub-discipline which follow are comments on future objectives, especially those for the coming year.

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Sampling Small Mammal Population In Curlew Valley Methodological Study, David F. Balph Jan 1971

Sampling Small Mammal Population In Curlew Valley Methodological Study, David F. Balph

Progress reports

No abstract provided.

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Data Bank And Data Processing, Us/Ibp Analysis Of Ecosystems Desert Biome Jan 1971

Data Bank And Data Processing, Us/Ibp Analysis Of Ecosystems Desert Biome

Progress reports

No abstract provided.

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Diets, Food Preferences And Reproductive Cycles Of Some Desert Mammals Process Study, Russell P. Balda, Gary C. Bateman, Terry A. Vaughan Jan 1971

Diets, Food Preferences And Reproductive Cycles Of Some Desert Mammals Process Study, Russell P. Balda, Gary C. Bateman, Terry A. Vaughan

Progress reports

No abstract provided.

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Evaluation Of Techniques For Estimating Population Sizes In Desert Rodents Methodological Study, C. D. Jorgensen, H. D. Smith, D. T. Scott, H. D. Tolley Jan 1971

Evaluation Of Techniques For Estimating Population Sizes In Desert Rodents Methodological Study, C. D. Jorgensen, H. D. Smith, D. T. Scott, H. D. Tolley

Progress reports

No abstract provided.

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Productivity And Water Stress In Cacti Progress Report, Duncan T. Patten Jan 1971

Productivity And Water Stress In Cacti Progress Report, Duncan T. Patten

Progress reports

No abstract provided.

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Validation Studies At Locomotive Springs, Curlew Valley Validation Study, J. Anne Holman Jan 1971

Validation Studies At Locomotive Springs, Curlew Valley Validation Study, J. Anne Holman

Progress reports

No abstract provided.

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Development Of Techniques For Estimating Biomass Of Desert Inhabiting Invertebrate Animals Methodological Study, Gordon L. Bender Jan 1971

Development Of Techniques For Estimating Biomass Of Desert Inhabiting Invertebrate Animals Methodological Study, Gordon L. Bender

Progress reports

No abstract provided.

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Growth And Development Of Sitanion Hystrix Process Study, M. Hironaka, E. W. Tisdale Jan 1971

Growth And Development Of Sitanion Hystrix Process Study, M. Hironaka, E. W. Tisdale

Progress reports

No abstract provided.

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Validation Studies At Tucson, Arizona, David Hendricks, A. Neil Macgregor, E. Lendell Cockrum, Et Al Jan 1971

Validation Studies At Tucson, Arizona, David Hendricks, A. Neil Macgregor, E. Lendell Cockrum, Et Al

Progress reports

No abstract provided.

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Soil Model -- Heat, Water, And Salt Flow, R. J. Hanks, D. D. Austin, W. T. Ondrechen Jan 1971

Soil Model -- Heat, Water, And Salt Flow, R. J. Hanks, D. D. Austin, W. T. Ondrechen

Progress reports

No abstract provided.

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Development Of A Technique For Measuring The Water Balance Of Validation Study Areas Methodological Study, John Thames, H. Qashu, C. Kiesel Jan 1971

Development Of A Technique For Measuring The Water Balance Of Validation Study Areas Methodological Study, John Thames, H. Qashu, C. Kiesel

Progress reports

No abstract provided.

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Ecosym-Climatic Classification, Stephen W. Zsiray Jr., Gene L. Wooldridge Jan 1971

Ecosym-Climatic Classification, Stephen W. Zsiray Jr., Gene L. Wooldridge

Progress reports

No abstract provided.

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