Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Environmental Sciences (368)
- Computer Sciences (320)
- Physics (246)
- Earth Sciences (233)
- Life Sciences (205)
-
- Social and Behavioral Sciences (135)
- Chemistry (133)
- Education (130)
- Engineering (130)
- Environmental Health and Protection (122)
- Mathematics (112)
- Science and Mathematics Education (102)
- Oceanography and Atmospheric Sciences and Meteorology (94)
- Natural Resources and Conservation (87)
- Geology (86)
- Hydrology (76)
- Water Resource Management (76)
- Arts and Humanities (73)
- Natural Resources Management and Policy (71)
- Soil Science (69)
- Law (56)
- History (51)
- Anthropology (50)
- Statistics and Probability (44)
- Applied Mathematics (38)
- History of Science, Technology, and Medicine (38)
- Water Law (36)
- Oceanography (35)
- Astrophysics and Astronomy (34)
- Institution
-
- University of Nebraska - Lincoln (272)
- Purdue University (80)
- William & Mary (63)
- Air Force Institute of Technology (60)
- Missouri University of Science and Technology (59)
-
- Old Dominion University (59)
- Utah State University (58)
- University of Northern Iowa (57)
- Syracuse University (48)
- Department of Primary Industries and Regional Development, Western Australia (38)
- New Jersey Institute of Technology (37)
- University of Colorado Law School (37)
- Western Michigan University (33)
- Claremont Colleges (27)
- Iowa State University (27)
- Bulletin of the Mineral Research and Exploration (25)
- Dartmouth College (25)
- Wright State University (23)
- University of Kentucky (22)
- University of Arkansas, Fayetteville (21)
- University of New Hampshire (21)
- Portland State University (18)
- University of South Florida (18)
- Nova Southeastern University (17)
- Western Kentucky University (16)
- Washington University in St. Louis (15)
- California Polytechnic State University, San Luis Obispo (14)
- Kansas State University Libraries (13)
- University of Rhode Island (13)
- Taylor University (10)
- Keyword
-
- Western Australia (31)
- Research and Technical Reports (15)
- Study (11)
- Irrigation (10)
- Utah (10)
-
- Water (10)
- Computer Science (9)
- Nebraska (9)
- United States (9)
- Western Kentucky University (9)
- College of Engineering and Computer Science (8)
- Draft Rules on Non-Navigational Uses of International Watercourses (8)
- Engineering (8)
- Groundwater (8)
- International lakes (8)
- International rivers (8)
- International water courses (8)
- International watercourses (8)
- Law (8)
- Newsletters (8)
- Science news (8)
- Technical writing (8)
- United Nations International Law Commission (8)
- Water quality (8)
- Water rights (international law) (8)
- Computer simulation (7)
- Ecology (7)
- ILC (7)
- Image processing (7)
- Nutrients (7)
- Publication
-
- Department of Computer Science Technical Reports (80)
- Theses and Dissertations (66)
- Eastern Wildlife Damage Control Conference: 5th (1991) (50)
- Journal of the Iowa Academy of Science: JIAS (50)
- Great Plains Wildlife Damage Control Workshop Proceedings (45)
-
- Dissertations, Theses, and Masters Projects (39)
- Theses (37)
- Electrical Engineering and Computer Science - Technical Reports (36)
- Masters Theses (33)
- Reports (30)
- Nebraska Tractor Tests (27)
- Bulletin of the Mineral Research and Exploration (25)
- Opportunities for Undergraduate Research Experience Program (OURE) (25)
- Conservation and Survey Division (20)
- Innovation in Western Water Law and Management (Summer Conference, June 5-7) (20)
- Journal of the Department of Agriculture, Western Australia, Series 4 (19)
- All Physics Faculty Publications (18)
- Faculty Publications (18)
- Humanistic Mathematics Network Journal (17)
- Computer Science Technical Reports (16)
- All Computer Science and Engineering Research (15)
- School of Natural Resources: Faculty Publications (15)
- Conference on Applied Statistics in Agriculture (13)
- Marine Affairs Theses and Major Papers (13)
- Mark S. Gordon (13)
- Physics Faculty Publications (12)
- Physics Faculty Research & Creative Works (12)
- Technical Reports (12)
- RISK: Health, Safety & Environment (1990-2002) (11)
- The Probe: Newsletter of the National Animal Damage Control Association (11)
Articles 1 - 30 of 1542
Full-Text Articles in Physical Sciences and Mathematics
Unix And Security: The Influences Of History, Eugene H. Spafford
Unix And Security: The Influences Of History, Eugene H. Spafford
Department of Computer Science Technical Reports
No abstract provided.
Three Letters On Computer Security And Society, Eugene H. Spafford
Three Letters On Computer Security And Society, Eugene H. Spafford
Department of Computer Science Technical Reports
No abstract provided.
Editing Digital Audio Using A Perceptual Model, J. Mark Goode
Editing Digital Audio Using A Perceptual Model, J. Mark Goode
Theses
In this paper we describe an intelligent system used to aid an audio recording producer in the selection of edit points in a musical sequence. It is possible to make meaningful recommendations concerning auditory input data without the ability to fully classify that data or interpret all outside goals. Perceptual modeling of the auditory input can allow sufficient reasoning ability for an intelligent system to be of use editing digital audio. To create a perceptual model, the information which can be extracted by the ear is embodied in several expert sections which communicate with a rule based decision maker via …
The Effects Of Oxygen Tension On Nitrate Reduction By Pseudomonas Isolate, Hao-Jan Hsing
The Effects Of Oxygen Tension On Nitrate Reduction By Pseudomonas Isolate, Hao-Jan Hsing
Theses
It is a generally accepted concept that nitrate reduction only occurs under anaerobic conditions. Oxygen inhibits denitrification. However many studies of nitrate reduction under low oxygen tension have shown what has been called aerobic denitrification. This project examines the process of aerobic denitrification.
Oxgyen affects cell growth and the amount of nitrate utilized. When oxygen is absent, the cell growth rate is lower and nitrate utlization is higher then when oxygen is present.
Nitrate is reduced to nirite under anaerobic conditions. Nitrite accumulation did not continue increase. But increased then decreased producing a "Z" shaped graph when plotted.
A Study In Systems Integration Architecture, Sashidhar M. Prasad
A Study In Systems Integration Architecture, Sashidhar M. Prasad
Theses
This Thesis studies the two architectures OSCA and ANSA which support the ODPSE principle in the first two parts. In the third part the framework for integrating these two architectures is described. The idea of integration architectures in relation to open architectures is studied using the enabling technologies.
Communications Network For Distributed Real-Time Systems, Charles Silva
Communications Network For Distributed Real-Time Systems, Charles Silva
Theses
No abstract provided.
A Synthesis Technique Of General Petri Nets For Flexible Manufacturing And Multi-Rate Digital Signal Processing, Murthy S. Valluri
A Synthesis Technique Of General Petri Nets For Flexible Manufacturing And Multi-Rate Digital Signal Processing, Murthy S. Valluri
Theses
General Petri nets are useful for modeling flexible manufacturing system with multiple robots and workstations [KOH 90] and for multi-rate digital signal processing systems [CHA 91].. A problem of using Petri nets for modeling various systems is the large number of states generated. Various synthesis approaches have been proposed. Most of them do not deal with general Petri nets. Koh et. al. [KOH 90] invented a synthesis technique for generalized Petri nets. The purpose of this thesis is to extend their work by modifying the knitting technique by adding the Arc-Ratio rule.
Representation Of Graphical Deep Knowledge In An Object-Oriented Database System, Prasanna S. Venkatesh
Representation Of Graphical Deep Knowledge In An Object-Oriented Database System, Prasanna S. Venkatesh
Theses
Object-oriented approaches to the design of complex graphical interfaces have received an enormous impetus in the database and knowledge representation disciplines. As traditional CAD systems store information about all the objects for display purposes but do not store any knowledge for reasoning purposes, they are considered as "knowledge poor" and they cannot support efficient environments for design. In Artificial Intelligence the notion of "Graphical Deep Knowledge" has been proved successful to represent knowledge about objects for display purposes as well as reasoning purposes. To design "knowledge rich" systems which can support better graphical interfaces, the theory of "Graphical Deep Knowledge" …
Experiments In Aerobic And Anaerobic Biodegradation Of Trichloroethylene, Qiong Liao
Experiments In Aerobic And Anaerobic Biodegradation Of Trichloroethylene, Qiong Liao
Theses
The removal of trichloroethylene (TCE) from industrial waste has been intensively studied in recent years, Biodegradation has been determined to be an effective treatment for TCE in the environment. Many researchers have studied the biodegradation of TOE and obtained successful results based on the use of specific isolated bacteria. At the NJIT Biotechnology Laboratory, a new method is being developed in which immobilized activated sludge is used to degrade several toxic chemicals in various reactor configurations. The objective of this research is to determine if these methods can be extended to treat TCE.
Activated sludge from a wastewater treatment plant …
Measurement Of The Removal Of Selected Vocs From A Municipal Treatment Plant, Hong Yu
Measurement Of The Removal Of Selected Vocs From A Municipal Treatment Plant, Hong Yu
Theses
Industrial wastewater contains a variety of volatile chemical constituents. The large majority of the volatiles are organics. Many of these volatile or¬ganic compounds (VOCs) end up in the effluent to wastewater treatment plants. It is necessary to estimate the emission of the VOCs from sewerage plants in order to study the fate of these volatile organic compounds.
This study focuses on the estimation and comparison of the emission of 28 volatile organic compounds from the water and air in four operation units of Linden Roselle Sewerage Authority (LRSA) wastewater treatment plant. The removal rates of these target compounds have been …
Biomass Conversion Of Solid-Waste (Newsprint) Into A Clean Fuel (Ethanol) By Enzymic Hydrolysis And Fermentation, Nimesh V. Gandhi
Biomass Conversion Of Solid-Waste (Newsprint) Into A Clean Fuel (Ethanol) By Enzymic Hydrolysis And Fermentation, Nimesh V. Gandhi
Theses
A feasibility study has been performed with two bioprocesses for conversion of newsprint waste to an environmentally safe fuel (ethyl alcohol) and carbon dioxide.
The following areas were investigated to accomplish this task: one hour pretreatment of newsprint by attrition, saccharification of paper slurry to glucose by cellulase and cellobiase, effects of pH, temperature and concentration of enzymes on conversion of paper to sugar, fermentation of glucose to ethanol and carbon dioxide by immobilized yeast, and simultaneous saccharification and fermentation of paper to ethanol and carbon dioxide using enzymes and immobilized yeast.
Results indicate that the enzymic hydrolysis of newsprint …
Collisional Redistribution Of Polarized Radiation For Sr-Ar(He) Systems: A Numerical Comparison Of The Semiclassical Decoupiing/Locking Model To Exact Results, Ronald James Bieniek, Paul S. Julienne, Rank Rebentrost
Collisional Redistribution Of Polarized Radiation For Sr-Ar(He) Systems: A Numerical Comparison Of The Semiclassical Decoupiing/Locking Model To Exact Results, Ronald James Bieniek, Paul S. Julienne, Rank Rebentrost
Physics Faculty Research & Creative Works
Abstract Semiclassical formulations of collisional redistribution of polarized radiation are presented at several levels of approximation, from full classical path coupled equations to the backing/decoupling model. These are numerically tested against the results of a quantum mechanical coupled-channels formalism, by the comparison of polarization curves in both spectral wings of the Srf1 So-1 Pi) transition, with Ar and He as collisional perturbers. It is found that the locking/decoupling model can often produce good agreement with exact results if the effects due to trajectories and multiple Condon points are treated properly. Significant discrepancies due to the Condon approximation used ty the …
User Authentication And Related Topics: An Annotated Bibliography, Eugene H. Spafford, Stephen A. Weeber
User Authentication And Related Topics: An Annotated Bibliography, Eugene H. Spafford, Stephen A. Weeber
Department of Computer Science Technical Reports
No abstract provided.
Paint Stripper Composition Having Reduced Volatility Containing Decanolactone, N-Methylpyrrolidone And Butyrolactone And Method Of Use, Harvest L. Collier, Gary L. Bertrand, Raymond L. Venable
Paint Stripper Composition Having Reduced Volatility Containing Decanolactone, N-Methylpyrrolidone And Butyrolactone And Method Of Use, Harvest L. Collier, Gary L. Bertrand, Raymond L. Venable
Chemistry Faculty Research & Creative Works
An improved composition of matter and method of use for removing cured coatings of paint or varnish or other similar coatings from substrates. The composition comrpises chlorinated solvent paint strippers (especially methylene chloride (CH2CI2)), waxes and an additive selected from the group consisting of decanolactone (C10H18O2), N-methylpyrrolidone (CH3NCH2CH2CH2CH2) and butyrolactone (OCH2CH2CH2CO). The additive retards the evaporation of the solvent resulting in a composition that is environmentally less hazardous to a user and also resulting …
Magnetic Response Of A Single, Isolated Gold Loop, V. Chandrasekhar, Richard A. Webb, M. J. Brady, M. B. Ketchen, W. J. Gallagher, A. Kleinsasser
Magnetic Response Of A Single, Isolated Gold Loop, V. Chandrasekhar, Richard A. Webb, M. J. Brady, M. B. Ketchen, W. J. Gallagher, A. Kleinsasser
Faculty Publications
Measurements have been made of the low-temperature magnetic response of single, isolated, micron-size Au loops. The magnetic response is found to contain a component which oscillates with the applied magnetic flux with a fundamental period of Φ0=h/e. The amplitude of the oscillatory component corresponds to a persistent current of ≃(0.3–2.0)evF/L, 1 to 2 orders of magnitude larger than predicted by current theories.
A Note On Many-One And 1-Truth-Table Complete Languages, Steven Homer, Stuart A. Kurtz, James S. Royer
A Note On Many-One And 1-Truth-Table Complete Languages, Steven Homer, Stuart A. Kurtz, James S. Royer
Electrical Engineering and Computer Science - Technical Reports
The polynomial time 1-tt complete sets for EXP and RE are polynomial time many-one complete.
Resolution Of Enantiomeric Hydrocarbon Biomarkers Of Geochemical Importance, Daniel W. Armstrong, Yubing Tang, Janusz Zukowski
Resolution Of Enantiomeric Hydrocarbon Biomarkers Of Geochemical Importance, Daniel W. Armstrong, Yubing Tang, Janusz Zukowski
Chemistry Faculty Research & Creative Works
Chlral isoprenoid and hydroaromatic compounds occur in all crude oils, coals, shales, and most sediments. Many of these compounds are referred to as biological markers since they are thought to be derived from biological sources and their presence, relative concentrations, or stereochemistry can provide information as to a geological deposit's age, maturity, diagenetic history, and so forth. Because of the previous lack of effective and efficient analytical methodologies for resolving hydrocarbon enantiomers, the stereochemical information encoded in these molecules is largely untouched. A series of derivatized α-, β-, and γ-cyclodextrin chiral stationary phases (CSPs) were used for the gas chromatographic …
The Combinatorics Of Algebraic Splines, Chanderjit L. Bajaj
The Combinatorics Of Algebraic Splines, Chanderjit L. Bajaj
Department of Computer Science Technical Reports
No abstract provided.
Optimal Algorithms For Multipacket Routing Problems On Rings, Fillia Makedon, Antonios Symvonis
Optimal Algorithms For Multipacket Routing Problems On Rings, Fillia Makedon, Antonios Symvonis
Computer Science Technical Reports
We study multipacket routing problems. We divide the multipacket routing problem into two classes, namely, distance limited and bisection limited routing problems. Then, we concentrate on rings of processors. We prove a new lower bound of 2n/ 3 routing steps for the case of distance limited routing problems. We also give an algorithm that tightens this lower bound. For bisection limited problems the lower bound is kn/ 4,k >2, where k is the number of packets per processor. The trivial algorithm needs in the worst case k | n /2| steps to terminate. An algorithm that completes the routing in …
Visualization Of Four Dimensional Space And Its Applications (Ph.D. Thesis), Jianhua Zhou
Visualization Of Four Dimensional Space And Its Applications (Ph.D. Thesis), Jianhua Zhou
Department of Computer Science Technical Reports
No abstract provided.
Bird Response To Monofilament Lines At Backyard Feeders, Kimberly K. Kessler
Bird Response To Monofilament Lines At Backyard Feeders, Kimberly K. Kessler
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.
Biology And Ecology Of Dioryctria Ponderosae Dyar And Dioryctria Tumicolella Mutuura, Munroe And Ross, Mark A. Brohman
Biology And Ecology Of Dioryctria Ponderosae Dyar And Dioryctria Tumicolella Mutuura, Munroe And Ross, Mark A. Brohman
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.
Ecological Aspects Of Burrowing Owl Nesting Strategies In The Nebraska Panhandle, Martha J. Desmond
Ecological Aspects Of Burrowing Owl Nesting Strategies In The Nebraska Panhandle, Martha J. Desmond
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.
Water Current, Volume 23, December 1991
Water Current, Volume 23, December 1991
Water Current Newsletter
Massengale Presents Challenges at University Water Policy Forum
Governor Nelson Discusses Environmental Concerns at Nebraska Groundwater Foundation Luncheon
Report from the Director: Education and Research High Priorities
Surveys of Water-Related College-Education and Employment in Nebraska
California's Water Problems Explained at NGF Symposium
Cancer and Water Quality, Topic of Seminar
Wetlands Topic for 1992 Nebraska Water Conference
Environmental Cleanup Liabilities Farmers Should Consider
Eight States Evaluated in Groundwater Quality Research
Hungarian Students, Researchers to Collaborate in Environmental Degradation Studies
Stratigraphic And Paleontologic Studies Of Paleocene And Oligocene Carbonate Facies Of The Eastern Gulf Coastal Plain, Jonathan Russel Bryan
Stratigraphic And Paleontologic Studies Of Paleocene And Oligocene Carbonate Facies Of The Eastern Gulf Coastal Plain, Jonathan Russel Bryan
Doctoral Dissertations
Shallow marine Paleogene carbonates of the Eastern Gulf Coastal Plain contain a variety of unique and largely undocumented facies. The Late Paleocene Salt Mountain Limestone of southwestern Alabama is a coral-algal-sponge buildup composed of large foram-algal packstone, algal bindstone, and sponge-coral bafflestone. Abundant coralline algae and a low diversity coral fauna are characteristic of Paleocene reefs, but sponges are rare in earliest Tertiary sediments. Their abundance in the Salt Mountain could indicate an opportunistic response of sponges as reef constructors after the extinction of rudist-coral communities in the Late Cretaceous.
The Bridgeboro Limestone, a rhodolith and coral-bearing limestone in southwestern …
Consumption Rates, Evacuation Rates And Diets Of Pygmy Killifish, Leptolucania Ommata, And Mosquitofish, Gambusia Affinis In The Okefenokee Swamp, J. Douglas Oliver
Consumption Rates, Evacuation Rates And Diets Of Pygmy Killifish, Leptolucania Ommata, And Mosquitofish, Gambusia Affinis In The Okefenokee Swamp, J. Douglas Oliver
Faculty Publications and Presentations
I studied feeding dynamics of Leptolucania ommata and Gambusia affinis in the Okefenokee Swamp. Both fishes mainly ate insect larvae (such as Chironomidae) and Cladocera. Evacuation rates ranged from 0.143 (L. ommala in winter) to 0.279/hour (L. ommala in summer). Daily food consumption (dry weight) ranged from 24.2 (L. ommata in winter) to 148.3 mg/g/day (G. affinis in summer). Maximum consumption by both species was estimated at 26.31 mg/t m2 / day, in summer. These values are consistent with other observations supporting a hypothesis that invertebrate prey production is substantial in these blackwater wetlands.
Undergraduates, The Right Questions, And Cayley Produce Results, Gary J. Sherman
Undergraduates, The Right Questions, And Cayley Produce Results, Gary J. Sherman
Mathematical Sciences Technical Reports (MSTR)
During the summers of 1989, 1990, and 1991, eighteen undergraduates participated in a National Science Foundation Research Experiences for Undergraduates program at Rose-Hulman for which the author was the principal investigator. This paper provides some examples of the mathematics discovered during these three summers and discusses the philosophy, environment and process which made these discoveries possible.
Geology Newsletter- 1991, Department Of Geology
Geology Newsletter- 1991, Department Of Geology
Geological and Environmental Sciences News
Vol.1, No. 16
- Core Research Lab
- Faculty News
- Service Staff News
- Alumni/ Friends/ Former Faculty Notes
- 1991 Speakers Program
- New Alumni
- Awards and Scholarships
- Geology Club
Environmental Radiocesium In Subarctic And Arctic Alaska Following Chernobyl, M. Baskaran, J. J. Kelley, A. S. Naidu, D. F. Holleman
Environmental Radiocesium In Subarctic And Arctic Alaska Following Chernobyl, M. Baskaran, J. J. Kelley, A. S. Naidu, D. F. Holleman
Environmental Science and Geology Faculty Research Publications
Radiocesium (¹³⁴ Cs and ¹³⁷ Cs) concentrations were measured in soil, plant and wildlife samples from subarctic to arctic Alaska. Concentrations of ¹³⁷ Cs ranged from below detectable or low levels in whale and fish samples to as high as 242 Bq/kg in lichen. For all potential human food items, the radiocesium concentrations measured in this study were below accepted permissible levels for human consumption. Chernobyl-derived radiocesium concentrations ranged from below detectable or low levels in all arctic samples (soil, sediment, lichen, whale, fish and caribou) to 32 Bq/kg in subarctic moss. Therefore the distribution and subsequent deposition of Chernobyl-derived …
Hepatic Microsomal N-Hydroxylation Of Aniline And 4-Chloroaniline By Rainbow Trout (Onchorhyncus Mykiss), Steven P. Bradbury, J. M. Dady, A. D. Hoffman, M. M. Voit, D. L. Olson
Hepatic Microsomal N-Hydroxylation Of Aniline And 4-Chloroaniline By Rainbow Trout (Onchorhyncus Mykiss), Steven P. Bradbury, J. M. Dady, A. D. Hoffman, M. M. Voit, D. L. Olson
Steven P. Bradbury
N-Hydroxylation of aniline and 4-chloroaniline was quantified in rainbow trout microsomal preparations using h.p.l.c.-liquid scintillation methods. Radioactive phenylhydroxylamine and 4-chlorophenylhydroxylamine metabolites were identified by co-elution with non-labelled standards. The method provided resolution of metabolite standards, and quantification of both N-hydroxylated metabolites was achieved without derivatization. The maximum velocities at 25 degrees C were 33.8 +/- 1.40 and 22.0 +/- 0.98 pmol/min per mg for aniline and 4-chloroaniline N-hydroxylation, respectively. The Km values were 1.0 +/- 0.11 and 0.8 +/- 0.11 mM for aniline and 4-chloroaniline N-hydroxylation, respectively. These activities were not induced by treatment of the trout with Aroclor 1254 …