Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Earth Sciences (59010)
- Computer Sciences (58275)
- Environmental Sciences (52582)
- Engineering (40358)
- Life Sciences (40180)
-
- Physics (36689)
- Chemistry (34726)
- Geology (29738)
- Mathematics (27480)
- Social and Behavioral Sciences (24635)
- Oceanography and Atmospheric Sciences and Meteorology (16475)
- Statistics and Probability (13330)
- Education (12845)
- Computer Engineering (12825)
- Soil Science (12158)
- Medicine and Health Sciences (11857)
- Plant Sciences (11368)
- Natural Resources and Conservation (10285)
- Arts and Humanities (9741)
- Astrophysics and Astronomy (9217)
- Electrical and Computer Engineering (8913)
- Sustainability (8737)
- Natural Resources Management and Policy (8597)
- Artificial Intelligence and Robotics (8569)
- Water Resource Management (8310)
- Applied Mathematics (8029)
- Environmental Health and Protection (6964)
- Databases and Information Systems (6778)
- Science and Mathematics Education (6761)
- Institution
-
- University of Nebraska - Lincoln (24326)
- Western Michigan University (19507)
- Selected Works (16838)
- University of Kentucky (12195)
- TÜBİTAK (10319)
-
- Singapore Management University (7542)
- Utah State University (7353)
- Missouri University of Science and Technology (6086)
- Old Dominion University (5968)
- University of Wollongong (4868)
- William & Mary (4601)
- University of South Florida (3865)
- Wright State University (3840)
- Portland State University (3814)
- University of Nevada, Las Vegas (3639)
- Louisiana State University (3428)
- China Simulation Federation (3382)
- Brigham Young University (3243)
- City University of New York (CUNY) (3224)
- Purdue University (2816)
- Air Force Institute of Technology (2683)
- Claremont Colleges (2641)
- California Polytechnic State University, San Luis Obispo (2571)
- University of Arkansas, Fayetteville (2501)
- Western Washington University (2456)
- University of Texas Rio Grande Valley (2439)
- Department of Primary Industries and Regional Development, Western Australia (2378)
- University of Texas at El Paso (2327)
- Chinese Chemical Society | Xiamen University (2295)
- Chulalongkorn University (2267)
- Keyword
-
- Machine learning (1705)
- Climate change (1684)
- Western Australia (1597)
- Mathematics (1376)
- Chemistry (1159)
-
- Sustainability (1145)
- Physics (1067)
- Water quality (986)
- Deep learning (897)
- Geology (891)
- Groundwater (859)
- Machine Learning (834)
- Simulation (828)
- Research and Technical Reports (797)
- Water (780)
- United States (760)
- Education (758)
- Management (747)
- Nebraska (744)
- Agriculture (720)
- Artificial intelligence (719)
- Climate (705)
- GIS (700)
- Statistics (686)
- Security (680)
- Environment (674)
- Grains and field crops (674)
- Computer Science (666)
- Optimization (661)
- Ecology (659)
- Publication Year
-
- 2024 (8506)
- 2023 (12704)
- 2022 (18377)
- 2021 (27993)
- 2020 (15201)
-
- 2019 (15916)
- 2018 (13669)
- 2017 (12587)
- 2016 (12722)
- 2015 (12624)
- 2014 (12301)
- 2013 (11799)
- 2012 (12196)
- 2011 (10324)
- 2010 (8625)
- 2009 (7617)
- 2008 (7328)
- 2007 (6763)
- 2006 (5877)
- 2005 (5580)
- 2004 (4449)
- 2003 (3882)
- 2002 (3436)
- 2001 (3032)
- 2000 (2921)
- 1999 (2557)
- 1998 (2577)
- 1997 (2473)
- 1996 (2438)
- 1995 (2197)
- Publication
-
- Legacy Scout Tickets from Pure Oil Company (11044)
- Theses and Dissertations (8371)
- IGC Proceedings (1993-2023) (7168)
- Research Collection School Of Computing and Information Systems (6974)
- Thin Sections (5745)
-
- Electronic Theses and Dissertations (4214)
- Faculty Publications (3810)
- 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 (2295)
- Honors Theses (2164)
- Faculty of Informatics - Papers (Archive) (2013)
- Physics Faculty Publications (1944)
- 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 (1771)
- Department of Computer Science Technical Reports (1721)
- USF Tampa Graduate Theses and Dissertations (1608)
- 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 (1428)
- Publication Type
Articles 284491 - 284520 of 304035
Full-Text Articles in Physical Sciences and Mathematics
Annual Outflow Of Water From Nebraska, 1950-1983, Conservation Survey Division
Annual Outflow Of Water From Nebraska, 1950-1983, Conservation Survey Division
Conservation and Survey Division
No abstract provided.
Homotopy Equivalences On 3-Manifolds, Gerard A. Venema
Homotopy Equivalences On 3-Manifolds, Gerard A. Venema
University Faculty Publications and Creative Works
Suppose M3 is a 3-manifold and f: M3 ⟶ X is a homotopy equivalence onto an ANR X. In this paper the cellularity properties of point preimages under f are studied. It is shown that for every open cover α of X there exists an open cover β of X such that if f is a β-equivalence then each f-1(x) is α-cellular in M3 X R1. In fact, the (open) cellularity occurs in a continuous fashion and so the map f can be approximated by a Euclidean bundle map.
Ua66/8/3 Annual Report, Wku Geography & Geology
Ua66/8/3 Annual Report, Wku Geography & Geology
WKU Administration Documents
Annual report of activities of the WKU department of Geography & Geology.
Review Of In-Place Treatment Techniques For Contaminated Surface Soils - Volume 2: Background Information For In Situ Treatment, Ronald C. Sims, Darwin L. Sorensen, Judith Sims, Joan E. Mclean, Ramzi Mahmood, R. Ryan Dupont
Review Of In-Place Treatment Techniques For Contaminated Surface Soils - Volume 2: Background Information For In Situ Treatment, Ronald C. Sims, Darwin L. Sorensen, Judith Sims, Joan E. Mclean, Ramzi Mahmood, R. Ryan Dupont
Reports
This second volume of a two volume manual on in-place treatment of hazardous waste contaminated soil supports the treatment methodology described in Volume 1 (EPA- ). The information presented on monitoring to determine treatment effectiveness, characterization and evaluation of the behavior and fate of hazardous constituents in soil/waste systems, and properties (including adsorption, degradation, and volatilization parameters) for various compounds is intended to help the manual user in making more complex decisions and in selecting analyses concerning site, soil, and waste interactions. This report was submitted in partial fulfillment of Contract No. 68-03-3113 by Utah State University under the sponsorship …
Sediment-Phosphorus Relationships In Deer Creek Reservoir, Jay J. Messer, Thomas B. Hardy, Jean M. Ihnat
Sediment-Phosphorus Relationships In Deer Creek Reservoir, Jay J. Messer, Thomas B. Hardy, Jean M. Ihnat
Reports
Summary and Conclusions: Laboratory analyses of sediment samples recovered from Deer Creek Reservoir showed the sediments to have amoderate potential for serving as a source of phosphorus (P) for the overlying water solumn under anaerobic conditions. This source could account for the occurrence or exacerbation of blue-green algal blooms in the upper end of the reservoir when the sediment surface becomes anaerobic late in the summer. It could also delay the response of the reservoir to programs that decrease external P loading, if the upper end of the reservoir still has large enough algal blooms to render the sediment-water interface …
Soft-Op User Manual For Microcomputer Aided Process Control Of The Oxidation Ditch Facility, Drew D. Mcintyre
Soft-Op User Manual For Microcomputer Aided Process Control Of The Oxidation Ditch Facility, Drew D. Mcintyre
Reports
This manual is intended to be used in conjunction with the program SOFT-OP. SOFT-OP was developed at the Division of Environmental Engineering, Utah State University, Logan, Utah. Funding for the program development was supplied by Tremonton City Corporation, Tremonton, Utah. Foreword: SOFT-OP has been developed for use by operators of oxidation ditch wastewater treatment plants (extended aeration activated sludge). The program serves as a useful took in daily plant operation by assisting the operator in various tasks related to process control. These tasks are grouped within the following three classifications: 1. Implementation of control parameters 2. Analysis of process characteristics …
Abstracts Of Specialty Conference Papers; Delineation Of Landslide, Flash Flood And Debris Flow Hazards In Utah, B. Kaliser, M. K. Mccarter, R. Pack, J. Newman
Abstracts Of Specialty Conference Papers; Delineation Of Landslide, Flash Flood And Debris Flow Hazards In Utah, B. Kaliser, M. K. Mccarter, R. Pack, J. Newman
Reports
No abstract provided.
Erosion And Sedimentation In Utah: A Guide For Control, C. Earl Israelsen, Eugene K. Israelsen
Erosion And Sedimentation In Utah: A Guide For Control, C. Earl Israelsen, Eugene K. Israelsen
Reports
No abstract provided.
New Concepts For Preliminary Hydropower Design: The Powermax Slope, Binary Turbine Sizing, And Static Regain, Frank W. Haws, Eugene K. Israelsen
New Concepts For Preliminary Hydropower Design: The Powermax Slope, Binary Turbine Sizing, And Static Regain, Frank W. Haws, Eugene K. Israelsen
Reports
In Utah during the 1960s, the cost of producing electrical energy was as much, or in some cases more, by hydroelectric generation than by plants using steam from coal fired boilers. The relatively high hydropower cost was generally attributed to maintenance and replacement costs associated with plants that had been build in the 1920s. Utah Power & Light Company during the 1960 period decided not to renew power licenses and to abandon many small hdyroplants. Since 1973, rising coal and related fossil fuel costs have caused steam generation costs to accelerate and have made hydroelectric generation relatively more attractive. However, …
Hydropower Potential At State Dam Logan River, Frank W. Haws
Hydropower Potential At State Dam Logan River, Frank W. Haws
Reports
No abstract provided.
Use Of The Hewlett-Packard 9810 Calculator System In Water Quality Analysis, Jerald S. Fifield
Use Of The Hewlett-Packard 9810 Calculator System In Water Quality Analysis, Jerald S. Fifield
Reports
Introduction: It is the purpose of this manual to illustrate the utilization of the Hewlett-Packard, Model 9810A calculator for analyzing water quality data. Familiarization of each program's capabilities is essential for successful application, thus the user should read over the section used before beginning. Each section is complete with instructions and illustrative examples.
Review And Evaluation Of The Gibson Dome High Level Nuclear Waste Repository Environmental Assessment: Geohydrologic Issues, Christopher J. Duffy, Brad Hall
Review And Evaluation Of The Gibson Dome High Level Nuclear Waste Repository Environmental Assessment: Geohydrologic Issues, Christopher J. Duffy, Brad Hall
Reports
Introduction: Background/Authorization: This report is meant to provide a technical review and evaluation of Department of Energy documents concerning groundwater, radionuclide travel time and monitoring issues relative to siting a high level nuclear waste repository in the Gibson Dome area in Southern Utah. in so doing we have, during a relatively short period of time, examined in detail the Department of Energy Guidelines concerning high level nuclear waste disposal (1983) including revisions (1984), and each draft of the Environmental Assessments for Davis and Lavender Canyon, up to and including the fifth draft (dated July 27, 1984). In addition, a large …
Summary Report: Updating The Estimation Of Water Surface Elevation Probabilities And Associated Damages For Great Salt Lake, L. Douglas James, David S. Bowles, D. George Chadwick, J. Paul Riley
Summary Report: Updating The Estimation Of Water Surface Elevation Probabilities And Associated Damages For Great Salt Lake, L. Douglas James, David S. Bowles, D. George Chadwick, J. Paul Riley
Reports
Problem Statement: Rising levels of the Great Salt Lake are severely impacting private and public property. in the private sector, the mineral industry, the railroad, and a number of recreation enterprises are suffering major damages. In the publi sector, the State of Utah is esperiencing large losses inflicted on roads and highways, waterfowl and related wildlife areas, and park and recreation facilities. The lake is partitioned by a semipervious railroad causeway into a north and a south arm with the sourth arm having about twice the water surface area and usually being two or three feet higher because it receibes …
Stratigraphy And Depositional Environments Of The Fox Hills Formation (Upper Cretaceous), Bowman County, North Dakota, Daniel J. Daly
Stratigraphy And Depositional Environments Of The Fox Hills Formation (Upper Cretaceous), Bowman County, North Dakota, Daniel J. Daly
Theses and Dissertations
The sedimentary structures, trace fossils, and lithology of the Upper Cretaceous Fox Hills Formation in Bowman County, North Dakota, were studied during the summer of 1979 and the spring of 1983. Twenty-three stratigraphic sections were measured and described and lithologic samples were collected for textural and mineralogical analysis, also, the major outcrops of the formation in the Dakotas and Montana were visited.
The formation in the study area was previously defined as a 27-mthick sandstone unit, containing three members--ascending, Trail City, Timber Lake, and Colgate--that was conformable with the underlying Pierre and overlying Hell Creek Formations. The Fox Hills, as …
Totally Empirical Wavefunctions From X-Ray Diffraction Data, Martin Jeffry Goldberg
Totally Empirical Wavefunctions From X-Ray Diffraction Data, Martin Jeffry Goldberg
Dissertations, Theses, and Capstone Projects
The interpretation of coherent x-ray diffraction experiments by a quantum model is described. Adjusting the coefficients of an LCAO expansion to best fit measured Bragg intensities results in a totally empirical quantum wavefunction. The quantum model is compared to a multipole expansion. The constraints imposed by quantum mechanics are examined, and several methods of satisfying these constraints while best fitting a wavefunction to measured Bragg intensities are detailed. Application is made to beryllium metal, with a resultant fit R(,1) = .00249. Similar applications to graphite and diamond are outlined. The formalism is extended to explicitly include solid-state effects, and this …
Lithology And Sedimentology Of The Graydon Springs Channel, Pennsylvanian Of Southwestern Missouri, Gregory Lee Easson
Lithology And Sedimentology Of The Graydon Springs Channel, Pennsylvanian Of Southwestern Missouri, Gregory Lee Easson
Masters Theses
"The Graydon Springs Member of Southwest Missouri, here assigned to the Warner Formation of Pennsylvanian age was sampled and examined in order to document the lithology, sedimentology, source area, stratigraphic position, and overall geologic history of these channel-like bodies. The member is composed of an upper sandstone unit and a lower conglomerate unit.
Laboratory investigations of thin sections indicate that the sandstone unit is composed of well sorted, well rounded quartz and minor amounts of accessory minerals cemented with iron oxide, commonly hematite. Field observations indicate that the conglomerate unit is composed of very poorly sorted, very well rounded chert …
Program Modeling And Control Synthesis For Robotic Manipulators, Ramiz Najib Ballou
Program Modeling And Control Synthesis For Robotic Manipulators, Ramiz Najib Ballou
Masters Theses
"The control and programming methodology of industrial robots is becoming increasingly important. The speed and accuracy of data generation, and the performance of the robot are considered the most important factors in robotics control.
This paper presents and discusses algorithms that solve for the inverse solution for a given point in space at a very high speed based on the top down abstract method. The algorithms are independent of any specific type of manipulator configuration or programming language. The algorithms were implemented or the IBM-PC using the FORTRAN language to control the Armdroid robot. The program generates 500 sets of …
Resin Acid Compounds In A Kraft Pulp And Paper Mill Effluent And Their Distribution In Bottom Sediments Near The Outfall, Manida Unkulvasapaul
Resin Acid Compounds In A Kraft Pulp And Paper Mill Effluent And Their Distribution In Bottom Sediments Near The Outfall, Manida Unkulvasapaul
Dissertations, Theses, and Masters Projects
Kraft pulp and paper mill effluents (KPPME) collected on three occasions were analyzed for resin acids, aliphatic hydrocarbons, and aromatic hydrocarbons. The maximum total concentrations of these compounds found in secondary effluents were 8 mg/L resin acids, 4.0 mg/L resolved aliphatic hydrocarbons, and 0.2 mg/L resolved aromatic hydrocarbons. Abietic acid and dehydroabietic acid were the two major components in resin acid fractions and were responsible for > 70% of the total concentration. Analyses of estuarine water and sediments collected from the outfall and nearby areas showed that dehydroabietic acid was the major resin acid in either water or sediment. Concentrations of …
Nanoplankton Dynamics In A Salt Marsh-Mudflat Ecosystem, Helena Maria Galvaeo
Nanoplankton Dynamics In A Salt Marsh-Mudflat Ecosystem, Helena Maria Galvaeo
Dissertations, Theses, and Masters Projects
No abstract provided.
Geologic Responses To Late Cenozoic Marine Transgressions In The Poropotank River Estuary, Virginia, Martin Lane Mitchell
Geologic Responses To Late Cenozoic Marine Transgressions In The Poropotank River Estuary, Virginia, Martin Lane Mitchell
Dissertations, Theses, and Masters Projects
No abstract provided.
Electrophoretic Stock Identification Of Summer Flounder, Paralichthys Dentatus, Garret Van Housen
Electrophoretic Stock Identification Of Summer Flounder, Paralichthys Dentatus, Garret Van Housen
Dissertations, Theses, and Masters Projects
No abstract provided.
Semi-Flexible Polyimide And Polyamide Systems, John Ryan Evans
Semi-Flexible Polyimide And Polyamide Systems, John Ryan Evans
Dissertations, Theses, and Masters Projects
No abstract provided.
Comparison Of Selected Radiopharmaceutical Chromatographic Quality Control Procedures, Lawrence Ray Andreatta
Comparison Of Selected Radiopharmaceutical Chromatographic Quality Control Procedures, Lawrence Ray Andreatta
University of the Pacific Theses and Dissertations
The purpose of this study was to compare the accuracy and reproducibility of two commercially available chromatography kits with Instant Thin Layer Chromatography-Silica Gel (ITLC-SG) and Whatman Chromatography Paper. The two commercial kits evaluated were the- MAC Klt- produced-General Radioisotopes Products, and the TECH Kit by Ackerman Nuclear.
Effect Of Temperature On The Association Constants Of Some Divalent Metal Ions With Chloride In Sea Water-Like Solutions, Jose Vinicio Macias Zamora
Effect Of Temperature On The Association Constants Of Some Divalent Metal Ions With Chloride In Sea Water-Like Solutions, Jose Vinicio Macias Zamora
University of the Pacific Theses and Dissertations
Association constants for the formation of lead (II) chloride complexes were studies in aqueous solutions also containing copper (II) and cadmium (II) ions.
The ionic strength was adjusted with sodium perchlorate to resemble that of sea water. The temperature was set at fixed values between 5° and 35° C to determine the effect on the equilibria in these systems. The total metal concentration was less than 10-8 M.
Differential pulse anodic striping voltammetry was used with a conventional three electrode system and a thin-film working electrode of Pt/Hg. Complex formation was followed as a function of the ligand concentration …
Systematic Estimate Of Binding Energies Of Weakly Bound Diatomic Molecules, Linda L. Vahala, Mark D. Havey
Systematic Estimate Of Binding Energies Of Weakly Bound Diatomic Molecules, Linda L. Vahala, Mark D. Havey
Electrical & Computer Engineering Faculty Publications
There is often insufficient spectroscopic data for a full RKR inversion to yield a potential for weakly bound diatomic molecules. In these cases, parametrized functions such as the Morse or Thakkar potentials may be used to obtain estimates of the binding energy. The Thakkar potential is more flexible, and has been used successfully on some weakly bound systems. In the more usual case, the Thakkar parameter p, which determines long range behavior R-p, is chosen by p=-a1-1, where a1 is the first Dunham coefficient; p is usually noninteger. The authors present …
Radiation Damage To Gaas Solar Cells Including Isotropic Effects, Larry Victor Stock
Radiation Damage To Gaas Solar Cells Including Isotropic Effects, Larry Victor Stock
Physics Theses & Dissertations
A model is developed for the short circuit current of a GaAs solar cell due to radiation (proton or electron) induced defects in the crystal structure. This model is verified by a comparison with proton and electron irradiation results. For electron radiation and energetic protons (energy> 10 MeV), it is found that the damage in the crystal is independent of the angle of incidence. On the other hand, for lower energy proton radiation, the damage as a function of cell thickness is highly dependent on incident angle and energy. The cell's response to low energy protons is strongly dependent on …
Mass Spectrometric Studies Of Oxygen Isotope Exchange Reactions With Oxide Surfaces, Gayle J. Allen
Mass Spectrometric Studies Of Oxygen Isotope Exchange Reactions With Oxide Surfaces, Gayle J. Allen
Chemistry & Biochemistry Theses & Dissertations
Isotopic exchange reactions with the surface of amorphous silica and crystalline quartz were studied mass spectrometrically. A mixture of approximately 2%18o2 in neon was used as the test gas, and was passed over the surface of the oxides. Measurements were taken as a function of temperature and residence time, for kinetic studies.
These studies clearly show a second order rate law for the surfaces examined. The rate constant on amorphous silica was 2.2xl02L/mol/sec. The energy of activation was 35.3 kcal/mol and the frequency factor was l.35xl09L/mol/sec. On the crystalline quartz the rate constant was 2.0xl0 …
Underwater Acoustic Wavefront Phase Fluctuations, George L. Vojtech Jr.
Underwater Acoustic Wavefront Phase Fluctuations, George L. Vojtech Jr.
OES Theses and Dissertations
In conventional underwater acoustics sound propagation is generally modeled and applied as a coherent or incoherent process. This paper addresses a relatively new theory, that of a range driven increasingly incoherent ray propagation through a real ocean environment, Possible mechanisms are discussed and experimental data presented to reinforce the theory.
The Development And Testing Of Soil Wetting Agents, Douglas Alexander Mcghie
The Development And Testing Of Soil Wetting Agents, Douglas Alexander Mcghie
Conference papers and presentations
Water repellent (non wetting) soils in Western Australia affect pasture and crop establish 7cent and growth, the erosion of particular land classes, and water use and turf health in urban areas. Experimental materials were synthesised to give a range of properties, some of which should optimise the performance as soil wetting agents. The soil wetting and rewetting properties of the experimental and many commerically available wetting agents were evaluated on a coarse, water repellent Bassendean sand using plastic ring infiltrometers. A rainfall simulator was used to study effective rates of the various materials for improving the penetration of rainfall into …
The Design And Implementation Of The Programming Language Natural, Alan L. Sparks
The Design And Implementation Of The Programming Language Natural, Alan L. Sparks
Masters Theses
"This paper reports progress on the development of the programming language Natural, currently under design by Dr. Thomas J. Sager at the University of Missouri--Rolla. Natural is a very high-level language with a mathematical flavor, and includes several concepts relatively uncommon in programming language design.
The text also discusses an implementation on the IBM Personal Computer of Mini-Natural, a subset of Natural, and presents examples of programs written in Mini-Natural"--Abstract, page ii.