Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Earth Sciences (58909)
- Computer Sciences (58041)
- Environmental Sciences (52430)
- Engineering (40293)
- Life Sciences (40001)
-
- Physics (36558)
- Chemistry (34557)
- Geology (29724)
- Mathematics (27425)
- Social and Behavioral Sciences (24595)
- Oceanography and Atmospheric Sciences and Meteorology (16445)
- Statistics and Probability (13278)
- Education (12822)
- Computer Engineering (12814)
- Soil Science (12126)
- Medicine and Health Sciences (11834)
- Plant Sciences (11332)
- Natural Resources and Conservation (10275)
- Arts and Humanities (9735)
- Astrophysics and Astronomy (9215)
- Electrical and Computer Engineering (8900)
- Sustainability (8701)
- Natural Resources Management and Policy (8576)
- Artificial Intelligence and Robotics (8542)
- Water Resource Management (8294)
- Applied Mathematics (8017)
- Environmental Health and Protection (6907)
- Science and Mathematics Education (6762)
- Databases and Information Systems (6728)
- Institution
-
- University of Nebraska - Lincoln (24231)
- Western Michigan University (19508)
- Selected Works (16838)
- University of Kentucky (12171)
- TÜBİTAK (10319)
-
- Singapore Management University (7471)
- Utah State University (7344)
- Missouri University of Science and Technology (6057)
- Old Dominion University (5959)
- University of Wollongong (4868)
- William & Mary (4601)
- University of South Florida (3860)
- Wright State University (3840)
- Portland State University (3800)
- University of Nevada, Las Vegas (3640)
- Louisiana State University (3421)
- China Simulation Federation (3382)
- City University of New York (CUNY) (3224)
- Brigham Young University (2906)
- Purdue University (2813)
- Air Force Institute of Technology (2679)
- Claremont Colleges (2641)
- California Polytechnic State University, San Luis Obispo (2569)
- Western Washington University (2456)
- University of Arkansas, Fayetteville (2444)
- University of Texas Rio Grande Valley (2423)
- Department of Primary Industries and Regional Development, Western Australia (2361)
- University of Texas at El Paso (2327)
- Chinese Chemical Society | Xiamen University (2294)
- Chulalongkorn University (2268)
- Keyword
-
- Machine learning (1697)
- Climate change (1681)
- Western Australia (1583)
- Mathematics (1371)
- Chemistry (1160)
-
- Sustainability (1143)
- Physics (1068)
- Water quality (986)
- Deep learning (894)
- Geology (892)
- Groundwater (857)
- Machine Learning (831)
- Simulation (828)
- Research and Technical Reports (797)
- Water (780)
- United States (759)
- Education (757)
- Management (747)
- Nebraska (744)
- Agriculture (719)
- Artificial intelligence (713)
- Climate (704)
- GIS (699)
- Statistics (686)
- Security (681)
- Grains and field crops (674)
- Environment (673)
- Computer Science (667)
- Optimization (660)
- Ecology (659)
- Publication Year
-
- 2024 (8259)
- 2023 (12653)
- 2022 (18335)
- 2021 (27888)
- 2020 (15202)
-
- 2019 (15922)
- 2018 (13643)
- 2017 (12523)
- 2016 (12710)
- 2015 (12616)
- 2014 (12298)
- 2013 (11457)
- 2012 (12196)
- 2011 (10325)
- 2010 (8620)
- 2009 (7616)
- 2008 (7322)
- 2007 (6758)
- 2006 (5872)
- 2005 (5574)
- 2004 (4448)
- 2003 (3877)
- 2002 (3436)
- 2001 (3030)
- 2000 (2920)
- 1999 (2555)
- 1998 (2576)
- 1997 (2472)
- 1996 (2438)
- 1995 (2193)
- Publication
-
- Legacy Scout Tickets from Pure Oil Company (11044)
- Theses and Dissertations (8341)
- IGC Proceedings (1993-2023) (7145)
- Research Collection School Of Computing and Information Systems (6903)
- Thin Sections (5745)
-
- Electronic Theses and Dissertations (4213)
- Faculty Publications (3805)
- Journal of System Simulation (3382)
- Nebraska Tractor Tests (3348)
- Turkish Journal of Electrical Engineering and Computer Sciences (3020)
- Masters Theses (2634)
- Turkish Journal of Chemistry (2628)
- Turkish Journal of Mathematics (2494)
- Journal of Electrochemistry (2294)
- Honors Theses (2164)
- Faculty of Informatics - Papers (Archive) (2013)
- Physics Faculty Publications (1942)
- Bulletin of the Mineral Research and Exploration (1893)
- Doctoral Dissertations (1883)
- Dissertations, Theses, and Masters Projects (1876)
- Reports (1835)
- Dissertations (1827)
- Physics Faculty Research & Creative Works (1762)
- Department of Computer Science Technical Reports (1721)
- USF Tampa Graduate Theses and Dissertations (1607)
- School of Natural Resources: Faculty Publications (1586)
- United States Department of Agriculture Wildlife Services: Staff Publications (1529)
- Australian Institute for Innovative Materials - Papers (1524)
- Electronic Thesis and Dissertation Repository (1477)
- All Graduate Theses and Dissertations, Spring 1920 to Summer 2023 (1427)
- Publication Type
Articles 288061 - 288090 of 303067
Full-Text Articles in Physical Sciences and Mathematics
A Limnological Study Of Ricks Pond And The Gulpha Creek Drainage In Garland County, Arkansas, Tom M. Buchanan, James Houston, Joe F. Nix, Richard L. Meyer, Eugene H. Schmitz
A Limnological Study Of Ricks Pond And The Gulpha Creek Drainage In Garland County, Arkansas, Tom M. Buchanan, James Houston, Joe F. Nix, Richard L. Meyer, Eugene H. Schmitz
Technical Reports
A limnological investigation of Ricks Pond and the Gulpha Creek drainage of Garland County, Arkansas was conducted between 1 June 1978, and 21 August 1978. Water samples taken from ten stations on three different dates indicated that the stream and pond systems were typical in water quality characteristics of other small, high gradient streams and impoundments in the Ouachita Mountains of Arkansas. In Ricks Pond, thermal stratification occurred along with the development of an oxygen deficient zone below a depth of one meter. Other water quality parameters indicated that Ricks Pond is a moderately productive ecosystem, with the productivity limited …
Hydrography And Hydrodynamics Of Virginia Estuaries. Xvii, Mathematical Ecosystem Modeling Study Of The York River, P. V. Hyer, A. Y. Kuo, C. S. Fang, W. J. Hargis Jr.
Hydrography And Hydrodynamics Of Virginia Estuaries. Xvii, Mathematical Ecosystem Modeling Study Of The York River, P. V. Hyer, A. Y. Kuo, C. S. Fang, W. J. Hargis Jr.
Reports
The York River drainage basin is rural, with an economy based on farming, logging, fishing and recreation. Water quality conditions are generally good, with low chlorophyll and nutrients and low fecal coliform counts. Dissolved oxygen concentrations are high except for periodic deoxygenation of the water deeper than 8 m in the reach extending 10 km upstream of the mouth.
A quasi-three dimensional tidal average model was constructed and calibrated using intensive field data collected in June and July, 1976 and verified using slack water run data from September, 1976. The model components are: salinity, fecal coliform, chlorophyll, CBOD, dissolved oxygen, …
An Emulsion Dye Laser, Kenneth Lee Matheson, James M. Thorne
An Emulsion Dye Laser, Kenneth Lee Matheson, James M. Thorne
Faculty Publications
A laser dye which is insoluble in water has been dissolved in hexane and emulsified in a water matrix. When pumped with a nitrogen laser, this mixture was observed to lase. The emulsion is superior to a simple hexane solution because the excellent thermo-optical properties of the water matrix help prevent refractive-index gradients from degrading laser performance. This is a useful characteristic for flash-pumped dye lasers, laser-pumped dye lasers, and liquid filters. Another type of solvent system, a critical solution, is also discussed. For certain dyes, a critical solution has even better thermo-optical properties because of its ability to absorb …
N-Body Modeling Of Nonlinear, Free Surface Liquid Flow, Donald Greenspan
N-Body Modeling Of Nonlinear, Free Surface Liquid Flow, Donald Greenspan
Mathematics Technical Papers
In this paper a new, n-body approach is developed for the modeling of liquid phenomena. Both long and short range forces are included. Computer examples of several prototype, nonlinear, free surface problems are described and discussed.
Fuzziness And Catastrophe, Martin Zwick, Daniel Guy Schwartz, George G. Lendaris
Fuzziness And Catastrophe, Martin Zwick, Daniel Guy Schwartz, George G. Lendaris
Systems Science Faculty Publications and Presentations
In a recent short note, Flondor has alluded to a possible linkage of fuzzy set theory and catastrophe theory. We consider several features of catastrophe theory, namely the properties of discontinuous jumps, hysteresis, and divergence in the "cusp catastrophe," and the role of the bias factor in the "butterfly catastrophe," which have affinities to and suggest possible extensions of fuzzy set ideas. Certain functions extensively considered in catastrophe theory lend themselves in some cases to interpretation as membership functions. The use of such functions may be of interest for the characterization of linguistic descriptions which are time-varying and encompass both …
Limnological Observations Of Sugar Creek, Lincoln County, Missouri, Joann Bull
Limnological Observations Of Sugar Creek, Lincoln County, Missouri, Joann Bull
Theses
Not available.
Groups Expressed As The Set-Theoretic Union Of Proper Subgroups, Lana Barrett
Groups Expressed As The Set-Theoretic Union Of Proper Subgroups, Lana Barrett
Masters Theses & Specialist Projects
In their paper “Groups as Unions of Proper Subgroups,” published in 1959, Haber and Rosenfeld posed the problem of characterizing groups which can be expressed as the set theoretic union of a finite collection of their proper subgroups. Haber and Rosenfeld established that a group G is the union of three proper subgroups (such a group G shall be called a U3-group) if and only if the Klein 4-group is a homomorphic image of G. Further results concerning U3-groups were obtained in the paper “Groups which are the Union of Three Subgroups” by Bruckhemier, Bryan and …
The Maine Coast : Issues Considered, Maine Coastal Program
The Maine Coast : Issues Considered, Maine Coastal Program
Maine Collection
The Maine Coast : Issues Considered - A Report to the Governor by his Advisory Committee on Coastal Development and Conservation
Maine Coastal Program, Maine State Planning Office
Augusta, Maine (31 October 1978)
Contents: Introduction / Summary of Committee Recommendations / Fisheries / Port Development / Heavy Industry Siting / Travel and Tourism / Cumulative Impact of Development / Natural Resource Information Transfer
Adaptive Multivariate Approximation Theory And Applications, John R. Rice
Adaptive Multivariate Approximation Theory And Applications, John R. Rice
Department of Computer Science Technical Reports
No abstract provided.
The Effect Of Crude Oil Prices On The Output Composition Of Refined Petroleum Products, Angelos Pagoulatos, David L. Debertin, Emilio Pagoulatos
The Effect Of Crude Oil Prices On The Output Composition Of Refined Petroleum Products, Angelos Pagoulatos, David L. Debertin, Emilio Pagoulatos
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
In this study the crude petroleum market is linked to the market of refined petroleum products through a set of technological relationships. An econometric study is used to quantify the existing relevant variables. The price equations for each refined product are used to derive estimates of elasticities with respect to quantity supplied, price of domestic crude oil and price of imports.
Low Btu Producer Gas -- A Fuel Of The Past And A Fuel Of The Future, Lee Carter
Low Btu Producer Gas -- A Fuel Of The Past And A Fuel Of The Future, Lee Carter
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
A prime purpose of this paper is to give conscious emphasis to an important type of coal gasification, one that does not demand hundreds of millions of dollars to launch an experimental program but instead is essentially ready to use after a reasonable and straightforward engineering check-out of the local coal sources and the prospective gas demand.
That type of coal gasification results in low Btu producer gas. This paper deals with its history, its technology and its economics. In the light of that information, the future of low Btu producer gas in America then is assessed.
Effective Utilization Of Energy From Biomass Residues In Agricultural Applications, Harry W. Parker
Effective Utilization Of Energy From Biomass Residues In Agricultural Applications, Harry W. Parker
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
Biomass is one of the more attractive alternative energy sources. Use of existing biomass residues within the farm and ranch economy can be accomplished with a minimum of organizational problems since the producer, processor, and consumer may be the same person or organization. The major task is to provide potential agricultural biomass users with accurate cost estimates for the energy made available from the biomass, and contemporary technology for its utilization.
Specific examples are given with regard to powering irrigation well engines with cotton gin trash via a producer gas generator, and conversion of harvested mesquite wood to digestible energy …
Cost Accounting Regulations In Oil And Gas Industries, Lakshmi U. Tatikonda, Rao J. Tatikonda
Cost Accounting Regulations In Oil And Gas Industries, Lakshmi U. Tatikonda, Rao J. Tatikonda
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
The cost accounting methods that are currently used in the oil and gas Industry are very diverse. Since the 1973 Arab Oil Embargo, increased attention was given to this issue, which resulted in the issuance of SFAS-19 by the FA SB and the SEC’s attempt to develop a new accounting method based on the value of their reserves. The pros and cons of the existing methods are discussed. Also discussed is the need for a uniform accounting procedure.
Energy Substitution Prospects, Vaman Rao
Energy Substitution Prospects, Vaman Rao
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
Any discussion about the future pattern of energy use invariably includes scernarios involving a switch-over to that source of energy which is available in abundant supply. It is taken for granted, for example, that coal will play a major role in the future and that the relative share of oil will decline with the passage of time. It is too simplistic to assume that a time series analysis will give the likely clues as to the pattern of switch-over from one source of energy to another. There has been a radical change in the structure of exchange relations between the …
National And Regional Agricultural Impact Of Natural Gas Deregulation And Curtailment Under A High Export Scenario, Barton C. English, Earl O. Heady, Dan Dvoskin
National And Regional Agricultural Impact Of Natural Gas Deregulation And Curtailment Under A High Export Scenario, Barton C. English, Earl O. Heady, Dan Dvoskin
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
An interregional national linear program ring model is used to evaluate the national and regional inpacts cn agriculture of two alternative natural gas policies -- curtailment to irrigation and deregulation. Energy use, agricultural production, commodity shadow prices, and resource use under natural gas curtailment and deregulation are compared to a base nn without these policy changes.
Analysis Of Residential Electric Demand In Southwestern Indiana, Mangi L. Agarwal
Analysis Of Residential Electric Demand In Southwestern Indiana, Mangi L. Agarwal
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
This study analyzes the residential demand for electricity in the Southern Indiana Gas and Electric Company service area. It explores the many variables which may contribute to electricity consumption. It also attempts to synthesize various weather and climatic data into one variable called the "comfort index" which may explain part of the electricity consumption. In estimating the demand equations, monthly data for twelve years have been used.
Gasification Of Municipal Solid Waste In A Fluidized Bed Reactor, Craig W. Mosley, Radon Tolman
Gasification Of Municipal Solid Waste In A Fluidized Bed Reactor, Craig W. Mosley, Radon Tolman
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
Results of pilot plant municipal solid waste gasification studies conducted at the Adolph Coors Company, Golden, Colorado, are presented. The nominal one ton per hour, 150 psig, fluidized bed gasification system was operated during 1973- 1974 using steam and air as oxidants and fluidizing media. These studies show the feasibility of a one-stage, air blown, fluid bed MSW conversion system.
Burning Wood As A Supplement To Solid Waste, Andrew R. Banta, William P. Smith
Burning Wood As A Supplement To Solid Waste, Andrew R. Banta, William P. Smith
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
The University of Kansas at Lawrence uses natural gas and oil to generate steam for heating and other campus needs. The projected price increase of these fuels has led to a study of burning solid waste and wood. This study discusses the technical and economic considerations of burning wood. Topics included are sources and availability, collection and transportation, preparation and burning, and environmental effects. It is concluded that sufficient wood is available; truck transport is the only feasible option; drying some wood is desirable; and that the burning can be done separately or directly with the solid waste.
An Analysis Of Investments In Residential Energy Conservation In Southeast Missouri, Ralph Gunderson
An Analysis Of Investments In Residential Energy Conservation In Southeast Missouri, Ralph Gunderson
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
This study examines the economic feasibility of residential solar heating. Climatic and economic variables used in this report represent those of Cape Girardeau, Missouri. An annual cost model is used to determine the conditions under which solar heating achieves a reduced annual cost of heating relative to gas and electric heating systems.
Industrial Energy Conservation Through Boiler Operation Efficiency Improvement, Dupree Maples, G. D. Whitehouse
Industrial Energy Conservation Through Boiler Operation Efficiency Improvement, Dupree Maples, G. D. Whitehouse
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
A method of determining the minimum amount of oxygen in the flue gas which results in the most efficient combustion is discussed. Results of field test are presented. The magnitude of the stack gas losses is dependent on the stack gas composition determined by the fuel and quantity of excess air and the stack temperature.
Oil Shale Energy And The Environment, Stephen Utter
Oil Shale Energy And The Environment, Stephen Utter
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
Shale oil can be produced from oil shale by true In situ, modified in situ, and surface retorting methods. Both modified in situ and surface methods require mining of the oil shale. The environmental Implications of an oil shale mining industry are reviewed and the impacts upon land use, air and water quality, and ecological systems discussed. The Bureau's mining environmental research program is described and the results to date summarized.
New Concept In Louver Blade Design Reduces Energy Losses, Peggy Kitchen, R. David Moore
New Concept In Louver Blade Design Reduces Energy Losses, Peggy Kitchen, R. David Moore
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
A new louver blade design, developed through extensive wind tunnel tests, employs an airfoil shape with excellent aerodynamic characteristics. Stressed-skin construction adds strength and rigidity permitting the use of longer blades and the elimination of unnecessary frame sections. Lever arms and linkage rods are placed out of the airstream, further reducing resistance to airflow. Louvers and dampers employing this design will have a pressure drop of from 1/4 to 1/10 that of units of traditional design.
Fuel Gas From Wood Waste, V. K. Mathur, R. A. Caughey
Fuel Gas From Wood Waste, V. K. Mathur, R. A. Caughey
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
Design, construction and operation of a new type of gasifier for the production of fuel gas from wood waste (sawdust, chips, bark, etc.) are discussed. Data obtained from pilot plants are presented. The gasifier is inexpensive, easy to operate and has about 95% efficiency.
Banquet Speaker: Energy -- What We Must Do, Peter Van Nort
Banquet Speaker: Energy -- What We Must Do, Peter Van Nort
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
You have heard for the last two days and will hear tomorrow relative to energy what people are planning, what is being researched, what is proposed, what is possible, what is being tested, etc. I would like to tell you what each of us must do relative to energy. I hope you will excuse me for being presumptuous….
The message might better be called a plea -- a plea from one person committed to the great- ness of this country and more importantly, committed to its survival in its present form….
We are in a crisis….Never before have we run …
Heat Recovery System For Glass Melting Furnace, Milton J. Murry
Heat Recovery System For Glass Melting Furnace, Milton J. Murry
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
The installation and operating of a 100 ton per day glass melting furnace by Flat River Glass Company to make specialty bottles provided an excellent opportunity for recovery of waste heat. The furnace operates at 2300°F, and four feeders to bottle making machines operate at 2100“F. The 120,000 s.f. packaging area is next to the furnace bay, and it is heated solely by reclaimed heat from the melting furnace bay.
There are two systems that are used to transfer this waste heat from the furnace area to the packaging area. The first of these systems is a water loop. Water …
An Analysis Of Solar Heating Costs In Arkansas Broiler Houses, Ralph Gunderson, J. Martin Redfern
An Analysis Of Solar Heating Costs In Arkansas Broiler Houses, Ralph Gunderson, J. Martin Redfern
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
This study is based on the computer simulation model of a solar heated broiler house in four locations in Arkansas. This simulation model estimated the annual energy savings in each broiler house due to the installation of a solar heating system. This paper uses present value analysis to estimate the life cycle costs of heating conventional and solar heated broiler houses in the state of Arkansas. From these calculations, the number of years required to achieve a break-even cost of heating is estimated.
The Development Of Coal-Based Emulsions And Their Potential Impact On The National Economy, Murphy I. Song
The Development Of Coal-Based Emulsions And Their Potential Impact On The National Economy, Murphy I. Song
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
The proposed national energy policy emphasizes the use of coal replacing oil and gas. Coal-oil mixture (COM) can be produced using techniques developed in recent years to replace oil and gas. Large existing utility and industrial boilers could be converted to bum COM by retrofitting the boilers. In addition, the COM provides definite financial advantages to the owners of large utility and industrial boilers. The use of COM impacts on the national economy through new investment for retrofitting utility and industrial boilers, through reduced importation of residual oil, and through increased demand for coal.
Usable Energy Resources Expand Under The Economic Pressures Of Fuel Scarcity, Raphael Shen
Usable Energy Resources Expand Under The Economic Pressures Of Fuel Scarcity, Raphael Shen
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
Until mankind finds properties in materials that are useful and usable under given economic conditions, these materials are not resources. In the past, many of them became usable as the ones they replaced became scarce and expensive. Market induced R & D toward profit seeking and cost minimization hastens to incorporate currently unused materials into the productive processes. With the increase in oil and natural gas prices, hitherto untapped energy sources present themselves as attractive alternatives. There will be no permanent shortage of energy resources, and the current energy crisis will be a page of past history in the foreseeable …
The Cost Of Crop Residues As An Auxiliary Fuel Source For Coal-Fired Power Plants, Cameron Short, Burton C. English, Steve K. Johnson, Earl O. Heady
The Cost Of Crop Residues As An Auxiliary Fuel Source For Coal-Fired Power Plants, Cameron Short, Burton C. English, Steve K. Johnson, Earl O. Heady
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
Estimates are made of the costs of crop residues as an auxilary fuel to existing coal-fired power plants. Costs of crop residues include costs for foregone agronomic benefits of incorporating crop residues, and costs for harvesting transporting processing and boiler modifications. A range of cost estimates is given depending on annual demand.
Innovations In Heat Pumps, Ronald Hunter Howell, Harry J. Sauer Jr.
Innovations In Heat Pumps, Ronald Hunter Howell, Harry J. Sauer Jr.
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
The status of the residential heat pump industry is reviewed. Some potential improvements in energy efficiency, operational reliability, and initial cost are described and delineated. These possible innovations include two-speed or variable speed compressors, reliable defrost initiation and termination, improved system components, modifications to the basic thermodynamic cycle, add-on-heat pumps, solar assisted heat pumps, annual cycle energy system, chemical heat pumps, and gas fired heat pumps.