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Articles 51541 - 51570 of 52361
Full-Text Articles in Physical Sciences and Mathematics
The Persistence Of Pesticides In Impounded Waters, Robert A. Lauderdale
The Persistence Of Pesticides In Impounded Waters, Robert A. Lauderdale
KWRRI Research Reports
The purpose of this study was to investigate the persistance of the insecticides aldrin, dieldrin, chlordane, and DDT in water. A small drainage area was sprayed with these compounds, and the insecticides were collected in the runoff water from the area. Laboratory experiments were performed to determine the effectiveness of aeration, adsorption on silt, and adsorption on algae in removing the pesticides from water.
All of the pesticides were found in samples of water collected from the area for the full period of the tests. The amounts which were found in a small pond into which the surface water drained …
Flora And Fauna Conservation : A Plea To Landholders, Clee Francis Howard Jenkins
Flora And Fauna Conservation : A Plea To Landholders, Clee Francis Howard Jenkins
Journal of the Department of Agriculture, Western Australia, Series 4
MUCH of the recent discussion on conservation has centred around the importance of wild flower reserves and the necessity for protecting one of the State's most important tourist attractions.
Although less important to visitors than the flowers, many of our wild animals hold equal interest for nature lovers and scientists, and they also need protection.
Pasture Establishment In The Wheatbelt, M L. Poole
Pasture Establishment In The Wheatbelt, M L. Poole
Journal of the Department of Agriculture, Western Australia, Series 4
The value of legume based wheatbelt pastures is so great that considerable care is warranted during their establishment. Without such care patchy establishment or even complete failure is likely to occur.
IN THE WHEATBELT too many farmers still put less effort into their seeding of pasture species than their seeding of crops.
This may be because both compete for the farmer's time in the busy seeding period and it is the cereal crop which possesses the obvious cash value.
However, the total value of a good pasture has to be assessed over a period of several years because of its …
Evaluation Of The Ovulated Follicle Technique As A Means Of Determining Pheasant Production, C. Denis Allen
Evaluation Of The Ovulated Follicle Technique As A Means Of Determining Pheasant Production, C. Denis Allen
Electronic Theses and Dissertations
A study of the ovulated follicle technique for determining egg production in pheasants was conducted during 1967 - 1969. Evidence indicated collection of wild hens for follicle counts should be between 5 and 14 weeks after cessation of laying. Questionable follicles encountered should be considered ovulated follicles and included in the counts. Most questionable follicles were believed to originate from ovulated atretic follicles that were harder to identify because of their particular stage of regression. The influence of freezing on atretic follicle counts was studied, and no adverse effects were found. A technique was developed for selectively staining atretic follicles. …
Fish Populations Of Two Small Impoundments In Northeastern South Dakota, William C. Thorn
Fish Populations Of Two Small Impoundments In Northeastern South Dakota, William C. Thorn
Electronic Theses and Dissertations
Thirteen species and large standing crops of fish were found in Blue Cloud Abbey Pond and Labolt Pond, South Dakota. Adult population was estimated to be 5184 fish in Abbey Pond and 5016 in Labolt Pond. Composition of the populations differed. Black crappies were most numerous in Abbey Pond; white crappies, in Labolt Pond. Total standing crop of adult fish in Abbey Pond (573.1 kg/ha) was slightly greater than in Labolt Pond (550.6 kg/ha). Black crappies in Abbey Pond and white suckers in Labolt Pond were the species with highest standing crops. Growth of fish was more rapid in Labolt …
Study Of A Uintah And Ouray Reservation Urea Fertilizer Manufacturingn Plant And Economic Development Potential Of A Charcoal Industry, Economic Development Operations
Study Of A Uintah And Ouray Reservation Urea Fertilizer Manufacturingn Plant And Economic Development Potential Of A Charcoal Industry, Economic Development Operations
Elusive Documents
No abstract provided.
Capitol Reef Historical Survey And Base Map, Lenard E. Brown
Capitol Reef Historical Survey And Base Map, Lenard E. Brown
Elusive Documents
No abstract provided.
Conversion Pinyon-Junifer Woodland To Grassland, Richard S. Aro
Conversion Pinyon-Junifer Woodland To Grassland, Richard S. Aro
Elusive Documents
No abstract provided.
Chemical And Physical Properties Of The Soils Of The Wasatch And Kamas Areas, Utah, Lemoyne Wilson, Alvin Southard, T. B. Hutchings, Austin J. Erikson, Marvin E. Olsen
Chemical And Physical Properties Of The Soils Of The Wasatch And Kamas Areas, Utah, Lemoyne Wilson, Alvin Southard, T. B. Hutchings, Austin J. Erikson, Marvin E. Olsen
Elusive Documents
No abstract provided.
Formulation Of A Mathematical Model For The Allocation Of Colorado River Waters In Utah, Rick L. Gold, James H. Milligan, Calvin G. Clyde
Formulation Of A Mathematical Model For The Allocation Of Colorado River Waters In Utah, Rick L. Gold, James H. Milligan, Calvin G. Clyde
Reports
A Mathematical model for the allocation of Utah’s water resources is formulated in the linear programming format. The availability of water from various sources is considered with the demands for water in each of the nine hydrologic study areas of Utah. The applications of mathematical models of this type are studied and the merits of the linear programming approach are discussed.
Telemetry System Modifications And 1968-69 Operation, Duane G. Chadwick
Telemetry System Modifications And 1968-69 Operation, Duane G. Chadwick
Reports
A discussion of telemetering system modifications is given, and discussion is presented of system operations for the 1968-69 snow season. A telemetering error analysis has been made for an operational period in February. A log is presented giving station operation periods, and a general summary of operational costs for the 1968-69 operational year is summarized.
Analog Computer Simulation Of The Runoff Characteristics Of An Urban Watershed, V. V. Dhruva Narayana, J. Paul Riley, Eugene K. Israelsen
Analog Computer Simulation Of The Runoff Characteristics Of An Urban Watershed, V. V. Dhruva Narayana, J. Paul Riley, Eugene K. Israelsen
Reports
In the syntheses of hydrograph characteristics of small urban watersheds, the distribution of water among the various phases of the runoff process is attempted by the concept of equivalent rural watershed. The urban parameters considered in the study are percentage impervious cover and characteristic impervious length factor. A mathematical model is developed for the equivalent rural watershed with precipitation as input. The hydrograph of outflow is obtained by chronologically deducting the losses due to interception, infiltration, and depression storages from precipitation and then routing through the watershed storage. This mathematical procedure is programmed on an analog computer and is tested …
Finite Difference Solutions To Free Jet And Confined Cavity Flows Past Disks With Preliminary Analyses Of The Results, Roland W. Jeppson
Finite Difference Solutions To Free Jet And Confined Cavity Flows Past Disks With Preliminary Analyses Of The Results, Roland W. Jeppson
Reports
A number of solutions are obtained to ideal axisymmetric flow past cavitating disks for both cases of a free surface jet and flow confined in a constant radius conduit. Finite difference methods are utilized in obtaining the solutions from an inverse formulation which considers the velocity potential, and Stokes’ stream function, as the independent variables and the radial and axial dimensions, r and z, as the dependent variables. The resulting inverse boundary value problem for r, for which the basis solution is obtained, is nonlinear. The solution technique uses a Newton-Raphson iteration to evaluate the implicit finite difference operator at …
Abstracts Of The Papers Presented At The Asce Hydraulics Division 17th Annual Specialty Conference, J. J. Leendertse, Robert P. Shubinski, E. L. Bourodimos, Calvin G. Clyde, Harl E. Judd, Dean F. Peterson, Roland W. Jeppson, James H. Milligan
Abstracts Of The Papers Presented At The Asce Hydraulics Division 17th Annual Specialty Conference, J. J. Leendertse, Robert P. Shubinski, E. L. Bourodimos, Calvin G. Clyde, Harl E. Judd, Dean F. Peterson, Roland W. Jeppson, James H. Milligan
Reports
No abstract provided.
A Perspective Of Contemporary Water Planning And Management Problems In Utah, Jay M. Bagley
A Perspective Of Contemporary Water Planning And Management Problems In Utah, Jay M. Bagley
Reports
I should like to discuss what I consider to be a few major problems Utah faces in connection with water and its development. Time will not permit great detail or breadth of discussion. The points I should like to discuss best can be made by first setting some hydrologic scenery. Actually, although hydrologic considerations provide the central melody to planning for water resources development, there are many socio-politico-legal-economic variations on the theme. My approach will be to remark briefly on thie environment in which today's planning must take place, provide some broad hydrologi guideposts, and with this backdrop select a …
Supplemental Final Report Wasatch Weather Modification Project, Utah Water Research Laboratory
Supplemental Final Report Wasatch Weather Modification Project, Utah Water Research Laboratory
Reports
No abstract provided.
Optimum Operation Of Desalting Plants As A Supplemental Source Of Safe Yield, Calvin G. Clyde, Wesley H. Blood
Optimum Operation Of Desalting Plants As A Supplemental Source Of Safe Yield, Calvin G. Clyde, Wesley H. Blood
Reports
No abstract provided.
Hydraulics Of Large Bed Element Channels, Harl E. Judd, Dean F. Peterson
Hydraulics Of Large Bed Element Channels, Harl E. Judd, Dean F. Peterson
Reports
No abstract provided.
State Organizational Patterns For Comprehensive Planning Of Water Resources Development, Daniel H. Hoggan
State Organizational Patterns For Comprehensive Planning Of Water Resources Development, Daniel H. Hoggan
Reports
No abstract provided.
Analysis Of Small Water Management Structures In Irrigation Distribution Systems, Gaylord V. Skogerboe, Wynn R. Walker, Brent B. Hacking, Lloyd H. Austin
Analysis Of Small Water Management Structures In Irrigation Distribution Systems, Gaylord V. Skogerboe, Wynn R. Walker, Brent B. Hacking, Lloyd H. Austin
Reports
The Irrigation and Drainage Research Conference conducted at Utah State University (ASCE, 1964) delineated many of the research needs regarding “Small Low- Cost Hydraulic Structures for Conveyance and Distribution Systems,” which was one of the six topics considered at the conference. In discussing possibilities for accomplishing the recommended research, it was suggested by some panel members that a considerable portion of the work could be undertaken by graduate students, particularly at the Master of Science level. The intent of this report has been to sort through the large volume of literature in an attempt to define the specific research needs …
Urgent Building Needs, Utah Water Research Laboratory
Water Quality Telemetry, Final Progress Report, Duard S. Woffinden, Allen D. Kartchner
Water Quality Telemetry, Final Progress Report, Duard S. Woffinden, Allen D. Kartchner
Reports
Water quality standards are now part of the legal code set up to control water pollution. In order to ascertain that these standards are being met, it is mandatory to monitor any river system over which control must be maintained. For optimum, usefulness, data on the monitored variables should be available on a real time basis at any time throughout the 24-hour day. Remote sampling stations and a telemetry link represent the most practical means of accomplishing this end. A water quality monitoring system utilizing radio telemetry has been developed at the Utah Water Research Laboratory (UWRL). The system consists …
The Effect Of Sediment Properties Of An Ultrasonic Plane Wave, G. H. Flammer, N. E. Stauffer Jr., E. Y. Liu
The Effect Of Sediment Properties Of An Ultrasonic Plane Wave, G. H. Flammer, N. E. Stauffer Jr., E. Y. Liu
Reports
No abstract provided.
Simulation Of The Hydrologic-Economic Flow System In An Agricultural Area, Murland R. Packer, J. Paul Riley, Harold H. Hiskey, Eugene K. Israelsen
Simulation Of The Hydrologic-Economic Flow System In An Agricultural Area, Murland R. Packer, J. Paul Riley, Harold H. Hiskey, Eugene K. Israelsen
Reports
Like the allocation of water resources among water users, the distribution of allocated water to the subusers requires an estimate of the economic costs and benefits from a number of distribution alternatives. The most satisfactory solution maximizes the benefit cost ratio. This study is based on the premise that equitable water distribution to agricultural subusers can be more easily accomplished through the use of a technique to predict the marginal value of agricultural water. A hydro-economic model is formulated to distribute the water supply to the crops and to determine the unit value of water for the given supply. By …
Analog Computer Solution Of The Unsteady Flow Equations And Its Use In Modeling The Surface Runoff Process, Utah Water Research Laboratory
Analog Computer Solution Of The Unsteady Flow Equations And Its Use In Modeling The Surface Runoff Process, Utah Water Research Laboratory
Reports
The flow of water on a watershed is usually unsteady and spatially varied, but can be adequately portrayed by the equations of momentum and continuity, commonly referred to as the unsteady flow equations. Because these equations are quasi-linear, hyperbolic, partial differential equations, they are not easily amenable to solution. Analog computer model~ of surface runoff generally have been based on simplified forms of these equations. As an improvement of those models, an analog computer solution is presented here for the unsteady flow equations. The solution involves the conversion of the partial differential equations in to a differential-difference system, and a …
Snowmelt Simulation, J. Paul Riley, Duane G. Chadwick, Keith O. Eggleston
Snowmelt Simulation, J. Paul Riley, Duane G. Chadwick, Keith O. Eggleston
Reports
The rapid growth in recent years of a variety of demands upon available water resources has lead to an increasing interest in more fundamental approaches to the science of hydrology. Accompanying this growth has been a need for an increased understanding of the snowmelt process. A completely adequate description of the entire physical process of snowmelt under all conditions is not yet available. The complex interrelated and variable nature of the snowmelt processes that occur simultaneously complicate the problem. A preliminary mathematical model of the snowmelt process has been developed in which processes such as pack settlement rates and energy …
Dolichopodidae (Diptera) And Braconidae (Hymenoptera) Of Curlew Valley, G. F. Knowlton, W.J. Hanson, G.E. Bohart
Dolichopodidae (Diptera) And Braconidae (Hymenoptera) Of Curlew Valley, G. F. Knowlton, W.J. Hanson, G.E. Bohart
Memorandum
No abstract provided.
Pasture Improvement In South Western Australia, J W. Malcolm
Pasture Improvement In South Western Australia, J W. Malcolm
Journal of the Department of Agriculture, Western Australia, Series 4
"There is no doubt that Australia's enhanced prosperity in the last 30 years has been dependent in no small measure on the use of legume-based pastures." E. M. Hutron, June, 1968. *
THE LAST 30 years have seen an increased interest in pasture improvement which has transformed much of Western Australia. Large areas have been sown to new and improved pasture species—as a result productivity of both livestock and cereal enterprises has risen.
Pasture : Corner-Stone Of Soil Conservation, W J. Burdass
Pasture : Corner-Stone Of Soil Conservation, W J. Burdass
Journal of the Department of Agriculture, Western Australia, Series 4
LEGUME PASTURE is the basis of prosperity in farming in the agricultural areas of Western Australia.
The livestock industry could not thrive without it and it also maintains fertility and soil structure for the cereal growing industry.
It is, in fact, the comer-stone on which the soil conservation conscious farmer rests his soil management.
Pastures For The Pastoral Areas, D G. Wilcox, K. Fitzgerald
Pastures For The Pastoral Areas, D G. Wilcox, K. Fitzgerald
Journal of the Department of Agriculture, Western Australia, Series 4
The pastoral areas lie generally outside the zone where cultivated crops are grown.
The rainfall is erratic and the basic pastures for sheep and cattle consist of native plants.
In some favoured areas however, and in particular situations, sown pasture species are becoming increasingly important.