Other Environmental Sciences Commons^™

Turbulent Transfer Over An Irrigated Crop Under Conditions Of Sensible Heat Advection, Raymond P. Motha

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Movements And Activity Patterns Of The Plains Pocket Gopher (Geomys Bursarius) In Nebraska, Dallas Virchow

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Local And Regional Components Of Sensible Heat Advection, Thomas W. Brakke, Shashi B. Verma, Norman J. Rosenberg

School of Natural Resources: Faculty Publications

Detailed knowledge of the advection of sensible heat is necessary to understand the energy balance of the evaporating surface in many parts of the world. Sensible hear advection can result from regional and/or local sources. The local and regional components of sensible heat advection (Aloc and Areg, respectively) are identified and their magnitudes in a semi-arid to sub-humid zone are established in the work reported here. Measurements of dry- and wet-bulb air temperature, wind speed and net radiation were made above an irrigated alfalfa field with relatively dry surrounding upwind at Mead, NE. A modified Bowen ratio-energy balance method which …

Social And Spatial Relationships Of Coyote Families And Neighboring Coyotes, Althoff D. P.

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Shelter Effects On Growth And Yield Of Corn - Nebraska, U.S.A., James R. Brandle

School of Natural Resources: Faculty Publications

No abstract provided.

Turbulent Exchange Coefficients For Sensible Heat And Water Vapor Under Advective Conditions, Shashi Verma, Norman J. Rosenberg, Blaine L. Blad

School of Natural Resources: Faculty Publications

Results are presented of micrometeorological measurements made over alfalfa and soybeans under conditions of sensible heat advection at Mead, Neb. The sensible heat advection phenomenon reported here is of a regional rather than a local nature. The exchange coefficient for sensible heat (Kh) is found to be generally greater than the exchange coefficient for water vapor (Kw). This result contradicts the usaul assumption of equality of Kh and Kw under nonadvection (lapse or unstable) conditions when the net transfer of both sensible heat and water vapor are away from the earth's surface. Under advective conditions, however, heat and water vapor …

Extreme Evapotranspiration By Irrigated Alfalfa: A Consequence Of The 1976 Midwestern Drought, Norman J. Rosenberg, Shashi Verma

School of Natural Resources: Faculty Publications

The rate of evapotranspiration by irrigated alfalfa at Mead, NE (41°09'N; 96°30'W, elevation 354 m) reached record levels in 1976. Evapotranspiration was measured with precision weighing lysimeters in a field 1.9 ha in size. Evapotranspiration ranged during the growing season from 4.75 to 14.22 mm day^–1 and exceeded 10 mm day­^–1 on one-third of the days studied. On each day of study the ratio of latent heat flux density (LE) to the sum of the net radiation and soil heat flux densities (Rn+S) was such that LE/ (Rn+S) > 1, indicating the occurrence of significant sensible heat advection. On …

Temperatures Of Alfalfa, Sorghum, Soybean And Grass As Measured With Leaf Thermocouples And An Infrared Thermometer, Silvio Steinmetz

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Local And Regional Components Of Sensible Heat Advection, T. W. Brakke

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Influence Of Irrigation On The Microclimate And Development Of White Mold Disease In Dry Edible Beans, L. E. Hipps

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Local And Regional Components Of Sensible Heat Advection, T. W. Brakke

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Dickey-Lincoln School Lakes Hydroelectric Project : Summary Of Water Quality Factors, New England Division, U.S. Army Corps Of Engineers

Dickey-Lincoln School Lakes Project

The prediction of future water quality conditions in and downstream from a proposed impoundment is dependent upon a myriad of physical, chemical and biological phenomena. It is known from limnology (science of lakes) that all physicochemical and biological functions are greatly controlled or influenced by lake hydro-dynamics, lake thermodynamics, and the quality of inflowing water.

Daily Maximum And Minimum Temperature Forecasts And The Influence Of Snow Cover, Kenneth F. Dewey

School of Natural Resources: Faculty Publications

Research into the relationship between snow cover and observed maximum and minimum temperatures is reviewed. An example of the importance of snow cover and forecasting max/min temperatures is presented for this past winter (1976-77). It is shown that there was a warm bias in the MOS temperature forecasts for the northern Great Plains following the receipt of a fresh cover of snowfall. it is proposed that snow cover be incorporated as a conditional predictor to be used only during specific synoptic conditions.

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

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Wind-Powered Hydrogen Electric Systems For Farm And Rural Use, Final Report, United States Department Of Energy

Agriculture

The objective of this study has been to determine the current technology of a wind-energy conversion system (WECS) of minimal cost for rural applications. Specifically, IGT has evaluated available methods for converting shaft horse-power from a wind turbine to electricity and hydrogen. A workable mix of these two energy forms with storage that can support the energy needs of selected farming operations and the rural home was sought.

Energy load patterns of several farming operations were examined for interfacing with the energy storage and delivery systems that are supplied by wind turbines dependent on the prevalent winds. Several preliminary designs …

Reflectant Induced Modification Of Soybean Canopy Radiation Balance. V Longwave Radiation Balance, M. W. Baradas, B. L. Blad, N. J. Rosenberg

School of Natural Resources: Faculty Publications

No abstract provided.

Reflectant Induced Modification Of Soybean Canopy Radiation Balance. Iv. Leaf And Canopy Temperature, M. W. Baradas, B. L. Blad, N. J. Rosenberg

School of Natural Resources: Faculty Publications

No abstract provided.

A System And Program For Monitoring Co2 Concentration Gradient, And Flux In An Agricultural Region, N. J. Rosenberg, S. B. Verma

School of Natural Resources: Faculty Publications

No abstract provided.

Carbon Dioxide Concentration And Flux In A Large Agricultural Region Of The Great Plains Of North America, S. B. Verma

School of Natural Resources: Faculty Publications

No abstract provided.

Resistance-Energy Balance Method For Predicting Evapotranspiration: Determination Of Boundary Layer Resistance And Evaluation Of Error Effects, S. B. Verma, N. J. Rosenberg, B. L. Blad

School of Natural Resources: Faculty Publications

No abstract provided.

Vertical Profiles Of Carbon Dioxide Concentration In Stable Stratification, S. B. Verma

School of Natural Resources: Faculty Publications

No abstract provided.

The Prediction Of Lake Huron Lake-Effect Snowfall Systems, Kenneth F. Dewey

School of Natural Resources: Faculty Publications

Data was collected during the 1971-72 snowfall season for the Lake Huron basin. The bulk aerodynamic approach, as formulated by Priestly, was utilized to estimate the daily average flux of heat and moisture over the lake. It was hypothesized that discriminant analysis could be employed to determine the threshold value (discriminant index) of the energy flux which is necessary for the occurrence of the lake-effect snowfall system. To determine the validity of this threshold value, the discriminant index was applied to a series of historical data. The results of this analysis indicated that the discriminant index could be utilized to …

Accuracy Of Lysimetric, Energy Balance, And Stability-Corrected Aerodynamic Methods Of Estimating Above-Canopy Flux Of Co2, S. B. Verma, N. J. Rosenberg

School of Natural Resources: Faculty Publications

No abstract provided.

Spectral Irradiance In Nebraska Reservoirs And A New Instrument For Its Measurement, Gary D. Uphoff

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Captan Toxicity To Fathead Minnows (Pimephales Promelas), Bluegills (Lepomis Macrochirus), And Brook Trout (Salvelinus Fontinalis), Roger O. Hermanutz, Leonard H. Mueller, Kenneth D. Kempfert

United States Environmental Protection Agency: Staff Publications

The toxic effects of capt an on survival, growth, and reproduction of fathead minnows (Pimephales promelas) and on survival of bluegiIIs (Lepomis macrochirus) and brook trout (Salvelinus fontinalis) were determined in a flow-through system. In a 45-week exposure of fathead minnows, survival and growth were adversely affected at 39.5 μLg/Iiter. Adverse effects on spawning were suspected but not statisticaIly demonstrated at 39.5 and 16.5 μLg/Iiter. The maximum acceptable toxicant concentration (MATC), based on survival and growth, lies between 39.5 and 16.5 μLg/liter. The lethal threshold concentration (LTC) derived from acute exposures was 64 μLg/liter, …

Chronic Effect Of Low Ph On Fathead Minnow Survival, Growth And Reproduction, Donald I. Mount

United States Environmental Protection Agency: Staff Publications

Fathead minnows (Pimephales promelas Rafinesque) were continuously exposed to reduced pH levels of 4.5, 5.2, 5.9, 6.6 and 7.5 (control) during a 13-month, one-generation test. Survival was not affected, even at the lowest pH tested. Fish behavior was abnormal, and fish were deformed at pH 4.5 and 5.2. Egg production and egg hatchability were reduced at pH 5.9 and lower, and all eggs were abnormal. A pH of 6.6 was marginal for vital life functions, but safe for continuous exposure. Free carbon dioxide, liberated by the addition of sulfuric acid to reduce the pH, may have had an unknown …

Chronic Toxicity Of A Copper, Cadmium And Zinc Mixture To The Fathead Minnow (Pimephales Promelas Rafinesque), John G. Eaton

United States Environmental Protection Agency: Staff Publications

Fathead minnows were exposed to a series or concentrations of a copper, cadmium and zinc mixture during a 12.5 month chronic test in water of 200 mg 1^-1 total hardness. The metal concentrations in the mixture were selected on the basis of results obtained during previous chronic exposures to each of the metals individually in the same water. Strict summation of the chronic toxicities of the metals was not indicated when they were tested in combination. Toxic effects of the mixture attributable to copper appeared to be increased, but that attributable to cadmium was reduced. The effects thought to …

Changes In Polysomes Of Black Locust Seedlings During Dehydration-Rehydration Cycles, James R. Brandle, P.D. Schnare, T.M. Hinckley, G.N. Brown

School of Natural Resources: Faculty Publications

No abstract provided.

Regional Hydrothermal Alteration Of The Leadville Limestone (Mississippian) Of Central Colorado, L. V. Benson

United States Geological Survey: Staff Publications

Massive metallic-sulfide deposits were implaced in the Leadville Limestone {Mississippian) of Central Colorado less than 70 million years ago. The thermal fluids which precipitated ore at Gilman, Colorado have regionally altered the Leadville Limestone. The sequence of alteration began with the recrystallization of limestone to a dark medium~grained dolomite containing a homogeneous distribution of Fe. This Was followed by partial recrystallization of the medium-grained dolomite to coarse-clear dolomite which contains an inhomogeneous distribution of Fe. The resulting banded rock is known as "zebra rock" . Precipitation of Si0 2 (jasperoid) occurred next. The jaspe=oid formed prior to the deposition of …

Digital Video Display System Using Cathode-Ray Tube, George M. Low, Arthur I. Zygielbaum, Warren L. Martin, Alexander Engel

School of Natural Resources: Faculty Publications

A digital video display system (DWDS) is disclosed for display of image, alphanumeric and other data on a cathode-ray tube (CRT) with sequential raster scan and two, four or eight gray shades. The DVDS includes a central processing unit for ac tivating the system, selecting the X (horizontal axis) and Z (in tensity modulation) modes, and designating the starting loca tion of two successive rasters of data from a memory accessed by a data multiplexer subsystem (DMS). At the end of each raster, the DMS interrupts the computer for a new starting lo cation of a raster of data to …