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Articles 15901 - 15930 of 16421
Full-Text Articles in Physical Sciences and Mathematics
Preliminary Reports 1976, G C. Macnish
Preliminary Reports 1976, G C. Macnish
Experimental Summaries - Plant Research
Effect of nitrogen sources on take-all 1975 season experiment - 75SG17. Effect of nitrogen sources on take-all experiment 76ES36, 76JE26, 76LG25. Take-all cultivar interaction experiment - 76JE29, 76LG29. take-all, spray-fallow and time of sowing experiments - 76GE35, 76LG26, 76LG38 and 76SG11. Take-all cleaning crops experiments - 76A7, 76E6, 76M47, 76N5 and 76WH11. Take-all cleaning crops on farmer's property experiments - 76LG27. Covered smut of barley - control experiment - 76A5. Covered smut of barley - control experiment - 76WH12. Build-up of barley covered smut experiment - 76A6. Cereal seed dressing - barley experiment - 76E5. Control of barley loose smut …
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System, Volume Iii-The Effects Upon The Zooplankton Associations, Edgar D. Short, Eugene H. Schmitz
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System, Volume Iii-The Effects Upon The Zooplankton Associations, Edgar D. Short, Eugene H. Schmitz
Technical Reports
The primary purpose of the zooplankton phase of the coordinated study was to attempt to evaluate the effects of dredging operations on the abundance, distribution, composition and complexity of the zooplankton communities within the aquatic system of the Arkansas River. The other phases of investigation include fish, macroinvertebrates, phytoplankton and some physico-chemical parameters. The lack of baseline data, needed for measurement of previous ecological conditions from which to detect past and future changes, proved to be a major impediment to any evaluation. Although the study involved only about 240 miles of the river in Arkansas, it should serve as an …
1976 Experimental Summary, D. Gillespie
1976 Experimental Summary, D. Gillespie
Experimental Summaries - Plant Research
1. Cultivar Evaluation in High Rainfall Areas a) Midland B/Seaton Park/Yarloop/Larisa - 72MT29 b) Trikkala evaluation trial - 76MT3 2. Pasture deterioration - high rainfall areas. Variety Daliak. Dinninup. Woogenellup. Yarloop. Mt. Barker. Nangeela. Midland B. Toodyay C. Guildford D. Jarrahdale B. Trikkala. Larisa. a) Phytotron experiments. Dinn. x (Daliak x Tood. C) (av. of 6 crosses) Dinn. x (Mid. B x Nangeela) (av. of 3 crosses Daliak x (Mid. B x Nangeela) (av. of 4 crosses) b) Field experiments - 76MA8, 76DE3. 3. Lucerne productivity and persistence - 74E3-Sheep, 74E4-Cattle, 74E3-Sheep, 74E4-Cattle, 75AL30-Cattle. 4. Effects of saline irrigation water-on …
Summary Of 1976 Field Trials, D J. Gilbey
Summary Of 1976 Field Trials, D J. Gilbey
Experimental Summaries - Plant Research
Doublegee seed longevity. Doublegee control. Crop yield loss - doublegee. Creeping knotweed. Guildford grass. Time of spraying 2, 4-D. Longevity of doublegee seed under continuous pasture. Locality: Avondale, Wongan Hills and Chapman Research Stations. Effect of double cropping, shallow dry cultivation and spraying pasture on viable doublegee seed - 74A4. Locality: Avondale Research Station. Effect of doublegee cropping, shallow dry cultivation and spraying pasture on viable doublegee seed - 74WH4. Locality: Wongan Hills Research Station. Doublegee seed longevity x cultivation - 75WH65. Locality: Wongan Hills Research Station. Doublegee seed longevity x cultivation - 74C7. Locality: Chapman Research Station. Doublegee seed …
1976 Field Crop Experiment, M. W. Perry
1976 Field Crop Experiment, M. W. Perry
Experimental Summaries - Plant Research
Performance of August sown cereals - 76MO50. To investigate the performance of late sown cereals for summer forage or grain in the eastern wheatbelt. This trial was designed to test the idea that even in a drought year, very late sowing of cereals might provide a low grain yield or at least a substantial quantity of summer feed.
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System: Volume I - Introduction, Summary And Conclusions, And Recommendations, Myra Mcnutt, T. M. Buchanan, L. R. Kraemer, R. L. Meyer, E. H. Schmitz
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System: Volume I - Introduction, Summary And Conclusions, And Recommendations, Myra Mcnutt, T. M. Buchanan, L. R. Kraemer, R. L. Meyer, E. H. Schmitz
Technical Reports
The Arkansas River originates in the eastern slopes of the Rocky Mountains near Leadville, Colorado, and extends through Kansas, Oklahoma, and Arkansas, where it flows into the Mississippi River. The Arkansas River is approximately 1,450 miles in length and drains a total area of 160,500 square miles. The river and its tributaries have been developed for navigation, flood control, and hydro-electric power, as well as recreational purposes under the River and Harbor Act of July 24, 1946. The development of the Arkansas River for recreational use will be completed in the near future. The McClellan-Kerr Arkansas River Navigation System was …
Methane Distribution And Production In The Georgia Salt Marsh, Larry P. Atkinson, John R. Hall
Methane Distribution And Production In The Georgia Salt Marsh, Larry P. Atkinson, John R. Hall
CCPO Publications
Bacterial action in the anaerobic sediments of Spartina salt marsh produce large quantities of methane. Water in contact with the marsh has methane concentrations 200-300 times normal oceanic concentrations. The methane content of the water varies from maximum of 1.2 mu l CH sub(4)/ super(l) super(-1) in the summer to a minimum of 0.005 mu l CHl1
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System - Volume Ii - Effects Upon The Phytoplankton Associations, Myra Mcnutt, Richard L. Meyer
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System - Volume Ii - Effects Upon The Phytoplankton Associations, Myra Mcnutt, Richard L. Meyer
Technical Reports
Phytoplankton are a major source of primary production in aquatic ecosystems and constitute one of the most important assemblages of the biotic community. These organisms are the basic level of the trophic pyramid upon which other organisms are dependent. The development, maintenance, and environmental influence of phytoplankton in and on the aquatic ecosystem has been a subject of interest and concern for many years. Most of the studies concerning the nature and distribution of phytoplankton have been confined to lacustrine systems. Hutchinson (1967), citing several lake studies, sutmarized various aspects of the physical and chemical factors associated with phytoplankton. These …
1976 South West Sub Clover Root Rot - White Rust On Rapeseed, M J. Barbetti
1976 South West Sub Clover Root Rot - White Rust On Rapeseed, M J. Barbetti
Experimental Summaries - Plant Research
1. South west sub clover root rot - 1975 cultivation experiments - To investigate the effect of time of cultivation, and nitrogen application, upon the incidence and severity of both tap and lateral root rot of subterranean clover. Localities - Karridale (76BU1), Manjimup (75MA1), and Walpole (75DE1). 2. South West sub clover root rot - 1976 cultivation experiments - Localities - Karridale (75BU11), Walpole (75DE12), and Narrikup (75AL36). 3. White rust on rapeseed - Aims - To examine the role of white rust seed infection in disease aetiology and epidemiology, both in an area containing white rust infected trash and …
1976 Report On Field Trials With Early-Maturing Subterranean Clover Crossbred Strains And Selections, D A. Nicholas
1976 Report On Field Trials With Early-Maturing Subterranean Clover Crossbred Strains And Selections, D A. Nicholas
Experimental Summaries - Plant Research
1. Drilled Trials in Wheatbelt Districts. Trial No. 76GE7, 76LG5, 76ME5, 76ME6, 76M011, 76M012, 76NA6, 76N01, 76TS10. A series of 9 trials to compare the crossbred subterranean clovers Nungarin, 239.2 and 584.1B. with Northam and Geraldton was sown in representative, dry wheatbelt localities in 1976. The trials were sown in randomised blocks with four replications on sites which carried little or no clover. Plot size was 4.22 metres by 40 metres. Superphosphate was applied at rates related to past applications and soil type, but was usually about 200 kg a hectare. Copper, zinc and molybdenum were applied where necessary. Seed …
1976 Pasture Species Investigations - Wheatbelt, N. R. Mckeown
1976 Pasture Species Investigations - Wheatbelt, N. R. Mckeown
Experimental Summaries - Plant Research
Trials in Progress. Only four grazing trials were continued in 1976. The pasture species and management trial at Moora (68M023) required a disproportionate amount of available work time. About 6 man-months were spent in completing the fencing, repairing and modifying the water system and increasing the working efficiency of the experiment. Sheep were reintroduced to the trial early in June. This report summarizes the results from the trials under the following headings:- Seasonal Conditions; Grazing Trials;, Legume Grazing Management Trial, West Moora - 68M023; Comparison of Production from Cyprus Medic and Volunteer Pasture - 71LG17; Tornafield Medic, Serradella and Subterranean …
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System, Volume V - The Effects Upon The Fish Population, Thomas M. Buchanan
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System, Volume V - The Effects Upon The Fish Population, Thomas M. Buchanan
Technical Reports
The Arkansas River extends for 1,450 miles from the eastern slopes of the Rocky Mountains in Colorado, southeasterly through Kansas, Oklahoma, and Arkansas, where it enters the Mississippi River in Desha County. The 448 mile navigation channel which was constructed on the lower portion of this river includes portions of two of its major tributaries, the Verdigris River in Oklahoma and the lower White River in Arkansas. The Arkansas portion of this navigation system consists of three different segments: (1) the lower White River, from its confluence with the Mississippi River to 10 miles upstream, (2) the Arkansas Post Canal, …
Ua66/8 Visibility Chart For College Heights Weather Station, J. M. B., Wku Geography & Geology
Ua66/8 Visibility Chart For College Heights Weather Station, J. M. B., Wku Geography & Geology
WKU Archives Records
Visibility chart created for the College Heights Weather Station. The chart measures 40" x 32" and is a series of concentric circles showing visible items up to 8 miles distant from the weather station. The inner most circles are at 1/4 and 1/8 mile intervals; 1/2 mile intervals through 3 miles and then 1 mile intervals to 8 miles. Features included on the chart are Pearce-Ford Tower, McDonald's restaurant, WBKO TV tower, Bowling Green-Warren County Hospital Water Tower, Bowling Green Water tower, Greenview Hospital, knobs and the Greewood Interchange
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System, Volume Iv - The Effects Upon The Benthic Associations, Louise Russert Kraemer
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System, Volume Iv - The Effects Upon The Benthic Associations, Louise Russert Kraemer
Technical Reports
The huge and increasing volume of dredged materials being moved in and from the bottoms of waterways of the U.S. is probably well known to the reader. Lee and Plumb (1974) distinguish between the 2 forms of dredging: (1) mining the bottom sediments (as in shell dredging), and (2) developing and maintaining navigable waterways. They indicate some 380,000,000 cubic yards are dredged annually in this country; maintenance dredging accounting for about 80,000,000 cy, and new construction for about 300,000,000 cy.* These figures (based on 5 yr. averages) do not include dredging by private companies. Smith (1975) comments: "With federal dredging …
The Influence Of Environmental Salinity On Hemocyanin Function In The Blue Crab, Callinectes Sapidus, Alan Lawson Weiland
The Influence Of Environmental Salinity On Hemocyanin Function In The Blue Crab, Callinectes Sapidus, Alan Lawson Weiland
Dissertations, Theses, and Masters Projects
No abstract provided.
Isolation And Characterization Of Estuarine And Marine Sedimentary Humic Acids, John G. Windsor Jr
Isolation And Characterization Of Estuarine And Marine Sedimentary Humic Acids, John G. Windsor Jr
Dissertations, Theses, and Masters Projects
No abstract provided.
A Two-Dimensional Stratospheric Model Of The Dispersion Of Aerosols From The Fuego Volcanic Eruption, Carolyn Frances Jones
A Two-Dimensional Stratospheric Model Of The Dispersion Of Aerosols From The Fuego Volcanic Eruption, Carolyn Frances Jones
Dissertations, Theses, and Masters Projects
No abstract provided.
The Biology Of The Sandbar Shark Carcharhinus Plumbeus (Nardo, 1827) In The Lower Chesapeake Bay And Adjacent Waters, Edward Fenton Lawler
The Biology Of The Sandbar Shark Carcharhinus Plumbeus (Nardo, 1827) In The Lower Chesapeake Bay And Adjacent Waters, Edward Fenton Lawler
Dissertations, Theses, and Masters Projects
No abstract provided.
An Examination Of Shoaling Wave Parameters, Lee Weishar
An Examination Of Shoaling Wave Parameters, Lee Weishar
Dissertations, Theses, and Masters Projects
No abstract provided.
Life History Of The Spotfin Killifish, Fundulus Luciae (Pisces Cyprinodontidae), In Fox Creek Marsh, Virginia, Donald M. Byrne
Life History Of The Spotfin Killifish, Fundulus Luciae (Pisces Cyprinodontidae), In Fox Creek Marsh, Virginia, Donald M. Byrne
Dissertations, Theses, and Masters Projects
No abstract provided.
The Reproductive Cycle Of Mya Arenaria L And Distribution Of Juvenile Clams In The Upper Portion Of The Nearshore Zone Of The York River, Virginia, Jon Lucy
Dissertations, Theses, and Masters Projects
No abstract provided.
A Two-Dimensional Time-Dependent Numerical Model Investigation Of The Coastal Sea Circulation Around The Chesapeake Bay Entrance, Everett Michael Stanley
A Two-Dimensional Time-Dependent Numerical Model Investigation Of The Coastal Sea Circulation Around The Chesapeake Bay Entrance, Everett Michael Stanley
Dissertations, Theses, and Masters Projects
No abstract provided.
Rare And Newly Recorded Chondricthyian And Teleostean Fishes Of The Continental Slope Of West Africa, G. A. Golovan
Rare And Newly Recorded Chondricthyian And Teleostean Fishes Of The Continental Slope Of West Africa, G. A. Golovan
Reports
This paper is composed primarily of species descriptions and accounts, and as such contains a very large number of abbreviations and numerals in the text. Inasmuch as the material presented in this form is central to the content of the paper, very great care was taken in transposing and checking this information between this translation and the original Russian version.
Trace Metals And Major Elements In Water-Soluble Rocks Of Northwest Arkansas, George H. Wagner, Kenneth F. Steele, Doy L. Zachry Jr.
Trace Metals And Major Elements In Water-Soluble Rocks Of Northwest Arkansas, George H. Wagner, Kenneth F. Steele, Doy L. Zachry Jr.
Technical Reports
Trace metals in limestone are potential water contaminants because they can enter the ground water when the limestone is dissolved by carbonic acid and other naturally occurring acids. Four local limestones, the St. Joe and Pitkin Formations (Mississippian) and the Brentwood and Kessler Members of the Bloyd Formation (Pennsylvanian) were sampled in a five county area in Northwest Arkansas. Atomic absorption analyses were made for Na, K, Mg, Ca, Zh, Cu, Ba, Fe, Co, Cr, Ni, Mn, Li and Sr on the acid soluble material of the samples. All the limestones are relatively pure CaCO3 with Pitkin the purest, 93.4%. …
Southern Chesapeake Bay Water Color And Circulation Analysis, Maynard M. Nichols, Hayden H. Gordon
Southern Chesapeake Bay Water Color And Circulation Analysis, Maynard M. Nichols, Hayden H. Gordon
Reports
Satellite imagery from two EREP passes over the Rappahannock Estuary of the Chesapeake region are analyzed to chart colored water types, to delineate color boundaries and define circulatory patterns.
Impact Of Development Of Offshore Oil: East Coast Of South American Case Study, Aldo H. Brussoni
Impact Of Development Of Offshore Oil: East Coast Of South American Case Study, Aldo H. Brussoni
Marine Affairs Theses and Major Papers
To analyze this Coastal Management problem it is convenient to have a regional overview of the entire South Atlantic Coast (South America). Go over some of its physical characteristics, the state of development of the offshore oil industry, the volume of its activities, and other related data, the recreational and the fishing industries, the population and its characteristics. This will develop a regional comprehension which is absolutely necessary to have in mind before analyzing the problems of any particular situation created in a country or an area of a country of the Southwest Atlantic Coast. After covering, very generally, all …
Microbenthic Algal Production Of An Intertidal Sandflat In Little Creek Harbor, Virginia Beach, Virginia, Clayton Barry Shedrow
Microbenthic Algal Production Of An Intertidal Sandflat In Little Creek Harbor, Virginia Beach, Virginia, Clayton Barry Shedrow
OES Theses and Dissertations
Estimated annual net microbenthic algal production of an intertidal sandflat on Little Creek Inlet, Virginia Beach, Virginia, was 105 g C/m2. Seasonally, primary production was greatest during the summer and fall periods (38 and 49 g C/m2, respectively). Productivity was found to vary directly with water temperature and standing crop of benthic diatoms, and inversely with incident solar radiation and standing crops of sedimentary chlorophyll 'a' and 'c'. Orthophosphate and nitrate-N appeared to be limiting factors, nitrate-N more so than orthophosphate. Mean annual net photosynthetic efficiency (based upon total light) for the microphytobenthic community was 0.09%. …
The Analysis Of Volatile Organic Compounds In The Southern Chesapeake Bay, Virginia By Gas Chromatography/Mass Spectrometry, James D. Haluska
The Analysis Of Volatile Organic Compounds In The Southern Chesapeake Bay, Virginia By Gas Chromatography/Mass Spectrometry, James D. Haluska
OES Theses and Dissertations
Sea-water samples from the Norfolk, Virginia area were analyzed for trace volatile organic compounds by helium sparging. Contents of the trap were injected into a gas chromatograph/mass spectrometer. Analysis of the trap contents indicated the presence of aliphatic and olef1nic hydrocarbons containing up to six carbon atoms and eight halogenated compounds of up to two carbon atoms in length. The halogenated compounds which were identified were dichlorofluoromethane, trichlorotrifluoroethane, carbon tetrachloride, chloroform, trichloroethane (2 isomers) bromodichloromethane, and chlorotrifluoroethylene. The
relative concentrations of volatile organic compounds generally tended to increase in samples collected from water prone to urban environmental pressures. All eight …
Urbanization And Environmental Change In Lynnhaven Estuary, Don W. Oswalt
Urbanization And Environmental Change In Lynnhaven Estuary, Don W. Oswalt
OES Theses and Dissertations
The very minimal amounts of available urbanization data demonstrate that the number of residential dwellings in the Lynnhaven drainage basin increased sharply in the late 1950’s and early 1960's, and that the 1970 basin population density value of 1981 people per square mile is larger than all the burrough density values, except for the Virginia Beach burrough. Due to a lack of data, only qualitative changes in Lynnhaven’s marine environment can be noted. There is a strong suggestion of an increase in amounts of urban storm water run-off into Lynnhaven since 1937. A considerable amount of siltation has occurred since …
Genetic Studies Of Cave And Spring Populations Of The Freshwater Amphipod Crustacean Gammarus Minus Say, Steven Wolf Hetrick
Genetic Studies Of Cave And Spring Populations Of The Freshwater Amphipod Crustacean Gammarus Minus Say, Steven Wolf Hetrick
Biological Sciences Theses & Dissertations
The amphipod Gammaru. minus has three morphotypes in its Appalachian range : (1) a spring form with well-developed eyes, (2) an intermediate cave form with slightly reduced eyes, and (3) an extreme cave form with greatly reduced eyes. This study compares the genetic structure of populations in two karst areas and analyzes the genetics of populations of the three morphotypes.
Genetic data were collected from populations in the Ward's Cove, Virginia and Greenbrier Valley, West Virginia karst areas using zone electrophoresis zymograms. One hundred percent of the Ward's Cove populations are polymorphic at both MDH-1 and PEP 1 loci …