Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Institution
-
- University of Nebraska - Lincoln (11816)
- Utah State University (2741)
- University of Nevada, Las Vegas (1856)
- William & Mary (1844)
- University of Colorado Law School (1643)
-
- Western Washington University (1574)
- China Coal Technology and Engineering Group (CCTEG) (1288)
- Portland State University (1245)
- Department of Primary Industries and Regional Development, Western Australia (1197)
- University of Kentucky (1177)
- Chulalongkorn University (1081)
- Selected Works (1070)
- Montana Tech Library (853)
- University of Arkansas, Fayetteville (848)
- City University of New York (CUNY) (833)
- SIT Graduate Institute/SIT Study Abroad (663)
- University of South Florida (656)
- Clemson University (575)
- Old Dominion University (512)
- Louisiana State University (499)
- Loyola Marymount University and Loyola Law School (482)
- South Dakota State University (477)
- The University of Maine (463)
- University of Vermont (458)
- University of Texas Rio Grande Valley (417)
- SelectedWorks (388)
- Edith Cowan University (383)
- Montclair State University (364)
- University of Tennessee, Knoxville (344)
- University of Texas at El Paso (326)
- Keyword
-
- Climate change (1027)
- Sustainability (910)
- Water quality (851)
- Western Australia (763)
- Research and Technical Reports (657)
-
- United States (597)
- Conservation (529)
- Environment (498)
- Ecology (485)
- Management (476)
- 2014 International Conference on Hydroinformatics HIC (465)
- Groundwater (461)
- GIS (460)
- California (428)
- Virginia (418)
- Agriculture (406)
- Water (383)
- Colorado (348)
- Climate (334)
- Energy (310)
- Natural resources (310)
- Utah (302)
- Gas (301)
- Drought (280)
- Remote sensing (272)
- Hydrology (261)
- Invasive species (257)
- Land use (255)
- Salinity (249)
- And Energy; Structural Materials; Sustainability (248)
- Publication Year
- Publication
-
- Reports (1628)
- School of Natural Resources: Faculty Publications (1585)
- United States Department of Agriculture Wildlife Services: Staff Publications (1529)
- Coal Geology & Exploration (1288)
- Thai Environment (937)
-
- Silver Bow Creek/Butte Area Superfund Site (840)
- Salish Sea Ecosystem Conference (806)
- Electronic Theses and Dissertations (754)
- Independent Study Project (ISP) Collection (626)
- Theses and Dissertations (545)
- United States Geological Survey: Staff Publications (513)
- The Prairie Naturalist (483)
- Great Plains Wildlife Damage Control Workshop Proceedings (478)
- World of Coal Ash Proceedings (472)
- International Conference on Hydroinformatics (464)
- United States Department of Commerce: Staff Publications (424)
- Theses (402)
- UNLV Theses, Dissertations, Professional Papers, and Capstones (399)
- Technical Reports (375)
- LSU Master's Theses (357)
- School of Natural Resources: Dissertations, Theses, and Student Research (343)
- USF Tampa Graduate Theses and Dissertations (340)
- S.C. Water Resources Conference (336)
- Journal of the Department of Agriculture, Western Australia, Series 4 (334)
- Open Access Theses & Dissertations (326)
- Memorandum (316)
- All Graduate Theses and Dissertations, Spring 1920 to Summer 2023 (305)
- School of Earth, Environmental, and Marine Sciences Faculty Publications and Presentations (299)
- Water Current Newsletter (291)
- Resource management technical reports (287)
- Publication Type
Articles 51031 - 51060 of 52385
Full-Text Articles in Physical Sciences and Mathematics
Eutrophication Factors In North Central Florida Lakes, H. D. Putnam, Patrick L. Brezonik, Earl E. Shannon
Eutrophication Factors In North Central Florida Lakes, H. D. Putnam, Patrick L. Brezonik, Earl E. Shannon
United States Environmental Protection Agency: Publications
A small Florida lake has been receiving a regimen of nutrient addition equivalent to 500 mg/m3-yr N and 43 mg/m3-yr P since 1967. Data has been accumulated through 1969. The effect on the lacustrine ecosystem of various biogenes includes production by primary producers, species diversity of plankton and certain production estimates at the secondary trophic level using natural populations of planktivorous fish. Plankton production using isotopic carbon is ca. 58 grms/m2-yr; Species diversity is slowly changing to a mixed chlorophycean and yellow-green. Biomass of benthic green filamentous types has increased slightly. Nutrient addition has …
Water Resources News, Volume 4, No. 1, January 1972
Water Resources News, Volume 4, No. 1, January 1972
Water Current Newsletter
House Hearings on Water Pollution Control
New Publications Available from the NWRRI
Coastal Zone Management
Ground Water Pollution
Economic Disclocation from Pollution Control
EPA Regulations
Waste Treatment Plant Guidelines
WRC Policy on Revision of Regional and River Basin Plans
Water Resources Council Outlines New Principles and Standards
Experts Advise on EPA on Sewage Plant Construction
Pollution Prevention Guide for Cottage Owners
Desalting Plant for Orange County, California
US Is Accelerating Desalting Programs
Farm Cleanup is Hindered by EPA Bias for Sewage
Sources Sought
Soil And Plant Analysis For Mineral Deficiencies, M D. Carroll
Soil And Plant Analysis For Mineral Deficiencies, M D. Carroll
Journal of the Department of Agriculture, Western Australia, Series 4
Soil and plant analysis (testing) has its supporters and its critics. Some of the differences are resolved if the distinction is made between the concept and the practice. Most people would agree with the concept of soil and plant analysis but the practice, or service offered, in any agricultural situation can be subject to valid criticism.
This article defines some of the principles involved and illustrates some of the problems, to provide a better understanding of the usefulness and the limitations of soil and plant analysis as a diagnostic aid in plant and animal nutrition.
The Alfred C. Glassell, Jr.—University Of Miami Argosy Expedition To Ecuador, Donald P. De Sylva
The Alfred C. Glassell, Jr.—University Of Miami Argosy Expedition To Ecuador, Donald P. De Sylva
Studies in Tropical Oceanography
No abstract provided.
Simultaneous Determination Of Short-Period Photosynthesis And Evapotranspiration (Horticulture And Forestry Progress Report No. 91), Norman J. Rosenberg
Simultaneous Determination Of Short-Period Photosynthesis And Evapotranspiration (Horticulture And Forestry Progress Report No. 91), Norman J. Rosenberg
School of Natural Resources: Faculty Publications
No abstract provided.
An Embryonic Forestry Program In Coastal British Columbia-Preparation For Management, M Crown
An Embryonic Forestry Program In Coastal British Columbia-Preparation For Management, M Crown
Yale School of the Environment Bulletin Series
No abstract provided.
A Simulation Model For The Management Of Sandhill Cranes, Richard S. Miller, George S. Hochbaum, Daniel B. Botkin
A Simulation Model For The Management Of Sandhill Cranes, Richard S. Miller, George S. Hochbaum, Daniel B. Botkin
Yale School of the Environment Bulletin Series
No abstract provided.
A Simulation Model For The Management Of Sandhill Cranes, Richard S. Miller, George S. Hochbaum, Daniel B. Botkin
A Simulation Model For The Management Of Sandhill Cranes, Richard S. Miller, George S. Hochbaum, Daniel B. Botkin
Yale School of the Environment Bulletin Series
No abstract provided.
Toward An Energy Policy, Dean E. Abrahamson
Toward An Energy Policy, Dean E. Abrahamson
Journal of the Minnesota Academy of Science
The lack of a national policy on fuels and energy at a time of concern about the future supply and demand for energy and the environmental effects of creating energy is examined. Alternatives to present practices in generating and utilizing power are considered along with suggestions for measuring the "energy cost" of technological progress.
Pollution From Sewage Loading In River And Lakes Downstream From Bemidji, James Ludwig
Pollution From Sewage Loading In River And Lakes Downstream From Bemidji, James Ludwig
Journal of the Minnesota Academy of Science
The deleterious effects and downstream distribution of pollutants from domestic sewage discharged at Bemidji, Minnesota, are examined with reference lo parameters for pollution as defined by the state's Pollution Control Agency (PCA). Periodic overloading of the resort city's sewage treatment plant also is considered, along with problems pertinent to a community upstream of popular vacation facilities on a lake and river system.
A Water Quality Survey, Dale E. Mcmichael
A Water Quality Survey, Dale E. Mcmichael
Journal of the Minnesota Academy of Science
Representative factors influencing water quality in the Albert Lea, Minnesota area were chosen as to assess water quality and changes in the watershed which has been described as an earlier valley of the Shell Rock River.
Parameters representative of chemical, bacterial, and thermal pollution were, respectively, total phosphorous, total and fecal coliform counts, and temperature. Statistical analysis has revealed that significant differences in some parameters measured do exist when various sampling stations of a given sampling date are compared. Statistical analysis also has indicated that correlations do exist between fluctuation patterns when all sampling stations of a given sampling date …
Nickel Mining And The Bwca: A Question Of Priorities, Walter E. Parham
Nickel Mining And The Bwca: A Question Of Priorities, Walter E. Parham
Journal of the Minnesota Academy of Science
A conflict in potential land use of the Boundary Waters Canoe Area (BWCA) exists between those who wish to see the area open to mining and those who want it retained as a natural wilderness. A review of information available to the public which relates to possible nickel mining within the BWCA suggests that the BWCA itself in its natural state is a more valuable resource to the people of the United States than it is as a source for nickel. The high U.S. rate of consumption of nickel, our use of nickel in products in which it is non-essential, …
Huxley Humus, 1972, Volume 02, Issue 01, Shriley Weston, Huxley College Of The Environment, Western Washington University
Huxley Humus, 1972, Volume 02, Issue 01, Shriley Weston, Huxley College Of The Environment, Western Washington University
Historical Collection of Huxley Newsletters
No abstract provided.
Heavy Metals - An Inventory Of Existing Conditions, M. E. Bender, R. J. Huggett, H. D. Slone
Heavy Metals - An Inventory Of Existing Conditions, M. E. Bender, R. J. Huggett, H. D. Slone
VIMS Articles
In this paper we report on studies undertaken to: (1) establish 1nercury levels in biota and sediments from the lower portion of Chesapeake Bay; (2) describe the pattern of metal distribution in oysters from 3 Virginia estuaries; and (3) determine if estuarine sediments can be used to detect the effects of man's activities on the environn1e nt. To date, mercury analyses of biota from the Bay area have sho\vn no levels in excess of FDA guidelines, nor have they indicated any influence of man's activities in the areas studies. Oysters have been shown to vary naturally in their body burdens …
Ecological Significance Of Vegetation To Northern Pike, Esox Lucius, Spawning, D. B. Mccarraher, Robert E. Thomas
Ecological Significance Of Vegetation To Northern Pike, Esox Lucius, Spawning, D. B. Mccarraher, Robert E. Thomas
Nebraska Game and Parks Commission: Staff Research Publications
Since 1955, information has been collected from six Nebraska sandhill lakes to evaluate northern pike spawning success based on type of aquatic vegetation preferred by pike for spawning. The lakes, all located in Cherry County, were Big Alkali, Watts, Hackberry, Cottonwood, Shell, and Pelican. Several investigators have commented that pike year class strength is closely related to type and abundance of aquatic vegetation present in a lake (Clark and Steinbach, 1959; Forney, 1967). Documented information on spawning habitats is scant other than vague references to pike spawning over submerged vegetation or inundated meadows.
Interactions Of Pesticides And Phytoplankton, Pamela H. Philyaw
Interactions Of Pesticides And Phytoplankton, Pamela H. Philyaw
Retrospective Theses and Dissertations
No abstract provided.
Pheasant Production Using Wild Cocks And Penned Game-Farm Hens, Michael R. Grode
Pheasant Production Using Wild Cocks And Penned Game-Farm Hens, Michael R. Grode
Electronic Theses and Dissertations
Pheasant production using free-flying wild cooks and penned game-farm hens was evaluated during 1971. Hens were placed in 0.5-acre pens to compare production at density levels of 10, 20, and 40 hens per acre. Wild cooks entered the 0.5-acre pens the day following introduction of the game-farm hens. The greatest numbers of cooks were observed in the pens with the highest density of hens. Censusing in mid-March indicated a population of 12 to 15 wild cooks in the vicinity of the study pens. A known mortality of 31 hens occurred and percentage mortality was similar at each density level. Pulling …
An Argument For The Open Ocean Siting Of Coastal Thermal Electric Plants, Clarence M. Tarzwell
An Argument For The Open Ocean Siting Of Coastal Thermal Electric Plants, Clarence M. Tarzwell
United States Environmental Protection Agency: Publications
A great deal of research is yet to be done before we will definitely know all the effects of thermal electric generating plants. It is evident, however, that the chlorination of the intake water is definitely lethal to a high percentage of planktonic and other organisms; that thermal shock is detrimental to some of the more sensitive forms; that the continued exposure to high temperatures after thermal shock is lethal to many forms, especially the zooplankton; that the screening and turbulence in such plants is lethal to larval fishes and several invertebrates, and that immense amounts of waters are put …
A Survey Of The Fishes Of The Mulberry River, Arkansas, Larry L. Olmsted, Gary D. Hickman, Donald G. Cloutman
A Survey Of The Fishes Of The Mulberry River, Arkansas, Larry L. Olmsted, Gary D. Hickman, Donald G. Cloutman
Technical Reports
Announcement of plans to dam Mulberry River, Arkansas, by the United States Army Corps of Engineers has generated some dispute. Most agruments against damming the stream revolve around environmental degradation and loss of aesthetic values. This report serves as a pre-impoundment survey of the fishes of the Mulberry River so that possible effects of impoundment can be more objectively assessed. Knowledge on the fishes of the Mulberry River is severely lacking. The first study was by Jordan and Gilbert (1886) who collected in the southern U.S. in July, August, and September, 1884. They collected in many streams in Arkansas including …
Determination Of Trace Elements In Water Utilizaing Atomic Absorption Spectroscopy Measurement, Gary D. Christian, J. Preston Miles Iii, Ronald Sensmeier, Melvin Sensmeier, Loraine Craig, Lynn Phibrick, Sudarshan Lal
Determination Of Trace Elements In Water Utilizaing Atomic Absorption Spectroscopy Measurement, Gary D. Christian, J. Preston Miles Iii, Ronald Sensmeier, Melvin Sensmeier, Loraine Craig, Lynn Phibrick, Sudarshan Lal
KWRRI Research Reports
A variety of flameless atomic absorption methods have been investigated for the possible determination of trace elements in water. The general applicability of each technique was determined and where applicable, procedures have been developed for the determination of trace elements in natural waters.
Metals were preconcentrated by electrodeposition on a wire. The metals were then atomized for atomic absorption measurement by resistive heating of the wire. As little as 0.01 part per million (ppm) of mercury could be determined in this way.
A mercury cold vapor cell was constructed in which the sample is treated with a reducing agent to …
Degradation Of Riparian Leaves And The Recycling Of Nutrients In A Stream Ecosystem, Louis A. Krumholz, Roger G. Lambert, Charles R. Liston, Harry H. Woodward
Degradation Of Riparian Leaves And The Recycling Of Nutrients In A Stream Ecosystem, Louis A. Krumholz, Roger G. Lambert, Charles R. Liston, Harry H. Woodward
KWRRI Research Reports
Leaves collected at 4 stations in the upper 5 km of Doe Run, Meade County, Kentucky, indicated an annual accumulation within the stream of 354 g/m2/year (17,700 kg). Leaves of sycamore (23.6%), red oak (21.7%), sugar maple (9.7%), beech (9.6%), white oak (7.1%), and hickory (6.0%) trees were most abundant, and leaves from 14 other kinds made up the remaining 22.3%. About a third of the annual leaf fall occurred during the last half of October and about two-thirds in the last 3 months of the year.
Calorific equivalents for different kinds of leaves ranged from 3,789 cal/g …
Factors Regulating The Growth Of Algae In Continuous Culture In Diluted Secondary Sewage Treatment Plant Effluent And Subsequent Biodegradability, Edward G. Foree, Caroline P. Wade
Factors Regulating The Growth Of Algae In Continuous Culture In Diluted Secondary Sewage Treatment Plant Effluent And Subsequent Biodegradability, Edward G. Foree, Caroline P. Wade
KWRRI Research Reports
Heterogeneous algal cultures were grown in laboratory continuous culture in continuous flow, completely mixed chemostats in secondary sewage treatment plant effluent diluted to give an ammonia nitrogen concentration of 10 mg/1. Variables were lighting, pH, carbon dioxide availability, and hydraulic residence time.
Optimum growth occurred under pH 7.0, excess CO2, and continuous lighting conditions. The availability of artificially supplied excess CO2 greatly increased the mass (standing crop) at steady-state over that produced under otherwise identical conditions for all residence times studied. For the case of excess CO2 availability, the nitrogen concentration in the algal cells regulated …
An Investigation Of Methods For Reuse Of Rubber Tires, Charles Edward Armbruster
An Investigation Of Methods For Reuse Of Rubber Tires, Charles Edward Armbruster
Retrospective Theses and Dissertations
Methods of reusing/recycling the more than 250 million automobile and truck tires which are worn out each year were investigated. The existing methods of reusing tires account for about 30 percent of the volume of scrap tires generated each year. These methods are, Retreading, Reclaiming (by reducing to ground up rubber and fiber), and Tire Splitting (stamp items out of sidewall and tread areas). Several possibilities for reusing/recycling the unused 70 percent were discovered. These methods are as follows: Destructive Distillation -- a method of recovering chemicals from tires by pyrolitic action. It is anticipated that eventually as much as …
Localized Wastewater Treatment Facilities, Robert Russell Garrett
Localized Wastewater Treatment Facilities, Robert Russell Garrett
Retrospective Theses and Dissertations
The report describes an alternative to the use of septic tanks for invidual dwellings. The major problems confronting the larger wastewater treatment plants (0.012 to 10 million gallons per day) in central Florida are also discussed. Solutions in this report are for individual and multi-unit dwelling treatment systems (to 0.06 MGD). these units can provide 90% biochemical oxygen demand (BOD) and suspended solids (SS) removal in accord with new state and county regulations. A comparison of the large versus the small plants reveals that small innovative plants, though more expensive, are more environmentally sound than the poorly operated large facilities. …
Electrostatic Precipitation, Robert C. Hinsey
Electrostatic Precipitation, Robert C. Hinsey
Retrospective Theses and Dissertations
No abstract provided.
Analyses Of The Water And Wastewater Systems At Florida Technological University, Fred C. Jensen
Analyses Of The Water And Wastewater Systems At Florida Technological University, Fred C. Jensen
Retrospective Theses and Dissertations
In searching for a subject to meet the M. S. Degree Research Report requirements, I had several objectives in mind. I wanted (1) a project with relevancy in the environmental field which would broaden my understanding of the environmental systems which I have studied, (2) a subject which would allow me to apply some of the Principles which I have learned in Operations Research , and (3) a project which had good practical application. With these objectives in mind, I reviewed the suggested topics presented by the Faculty and selected the FTU Water and Wastewater System Analyses topic which was …
Remote Sensing Of Environmental Parameters, Wendell Princeton Perkins
Remote Sensing Of Environmental Parameters, Wendell Princeton Perkins
Retrospective Theses and Dissertations
Atmospheric pollution in some degree has been around since time began. In recent times it has reached levels in some areas which proved to be harmful to man's health. A brief history review of these occurrences is presented. Laws have been enacted to combat this threat. A brief review of these laws is presented. Instruments for remote sensing of polluting sources are being developed to monitor ambient air quality and aid in enforcing these laws. A review of the techniques employed and the present state of the art is explored. Available instruments are presented in section III-5.
Rapid Mixing In Water And Wastewater Treatment, Randall C. Rector
Rapid Mixing In Water And Wastewater Treatment, Randall C. Rector
Retrospective Theses and Dissertations
No abstract provided.
Sinkholes In Florida And Their Effect On Man's Environment, Gregory Jackson Skinner
Sinkholes In Florida And Their Effect On Man's Environment, Gregory Jackson Skinner
Retrospective Theses and Dissertations
The primary reason for making the research study on "Sinkholes in Florida and Their Effect on Man's Environment", is an interest in learning more about this somewhat unique phenomenon and how it is likely to affect man in the future, particularly here in Central Florida. This is significant at this time in view of the large number of existing sinkholes, the frequency of occurrence, the projected population and economic growth, and the possible impact this growth may have on future sinkhole occurrences. The research concentrated on possible causes, effects, frequencies, locations and mean of predicting future sinkhole development. There is …
Wastewater Treatment Plant Control, David Milton Knowles
Wastewater Treatment Plant Control, David Milton Knowles
Retrospective Theses and Dissertations
This report is the result of investigation of the feasibility of increasing the use of autamatic controls at the Florida Technological University Wastewater Treatment Plant. This investigation was to include a literature search and visits to wastewater treatment plants. During the writers course of study, he was privileged to make a series of tests of a residual chlorine analyzer which was made in the school shop. Since this work was closely related to automatic controls the data are included in this report.