Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Earth Sciences (58714)
- Computer Sciences (57930)
- Environmental Sciences (52361)
- Engineering (40197)
- Life Sciences (39773)
-
- Physics (36524)
- Chemistry (34518)
- Geology (29715)
- Mathematics (27378)
- Social and Behavioral Sciences (24564)
- Oceanography and Atmospheric Sciences and Meteorology (16422)
- Statistics and Probability (13246)
- Education (12805)
- Computer Engineering (12790)
- Soil Science (11977)
- Medicine and Health Sciences (11785)
- Plant Sciences (11182)
- Natural Resources and Conservation (10266)
- Arts and Humanities (9726)
- Astrophysics and Astronomy (9205)
- Electrical and Computer Engineering (8897)
- Sustainability (8674)
- Natural Resources Management and Policy (8567)
- Artificial Intelligence and Robotics (8494)
- Water Resource Management (8291)
- Applied Mathematics (7991)
- Environmental Health and Protection (6879)
- Science and Mathematics Education (6757)
- Databases and Information Systems (6720)
- Institution
-
- University of Nebraska - Lincoln (24230)
- Western Michigan University (19508)
- Selected Works (16838)
- University of Kentucky (12002)
- TÜBİTAK (10317)
-
- Singapore Management University (7453)
- Utah State University (7340)
- Missouri University of Science and Technology (6056)
- Old Dominion University (5953)
- University of Wollongong (4868)
- William & Mary (4602)
- University of South Florida (3859)
- Wright State University (3840)
- Portland State University (3798)
- University of Nevada, Las Vegas (3640)
- Louisiana State University (3417)
- China Simulation Federation (3363)
- City University of New York (CUNY) (3219)
- Brigham Young University (2906)
- Purdue University (2813)
- Air Force Institute of Technology (2678)
- Claremont Colleges (2640)
- California Polytechnic State University, San Luis Obispo (2568)
- Western Washington University (2456)
- University of Arkansas, Fayetteville (2433)
- University of Texas Rio Grande Valley (2419)
- Department of Primary Industries and Regional Development, Western Australia (2354)
- University of Texas at El Paso (2316)
- Chinese Chemical Society | Xiamen University (2294)
- Chulalongkorn University (2268)
- Keyword
-
- Machine learning (1689)
- Climate change (1680)
- Western Australia (1581)
- Mathematics (1369)
- Chemistry (1157)
-
- Sustainability (1141)
- Physics (1068)
- Water quality (983)
- Deep learning (891)
- Geology (858)
- Groundwater (851)
- Machine Learning (827)
- Simulation (824)
- Research and Technical Reports (797)
- Water (780)
- United States (757)
- Education (755)
- Management (745)
- Nebraska (744)
- Agriculture (718)
- Artificial intelligence (707)
- Climate (702)
- GIS (698)
- Statistics (685)
- Security (681)
- Grains and field crops (674)
- Environment (672)
- Computer Science (667)
- Ecology (657)
- Optimization (656)
- Publication Year
-
- 2024 (7851)
- 2023 (12576)
- 2022 (18300)
- 2021 (27876)
- 2020 (15207)
-
- 2019 (15927)
- 2018 (13646)
- 2017 (12521)
- 2016 (12690)
- 2015 (12617)
- 2014 (12299)
- 2013 (11462)
- 2012 (12196)
- 2011 (10325)
- 2010 (8621)
- 2009 (7616)
- 2008 (7321)
- 2007 (6758)
- 2006 (5872)
- 2005 (5573)
- 2004 (4447)
- 2003 (3876)
- 2002 (3435)
- 2001 (3030)
- 2000 (2919)
- 1999 (2555)
- 1998 (2574)
- 1997 (2472)
- 1996 (2437)
- 1995 (2193)
- Publication
-
- Legacy Scout Tickets from Pure Oil Company (11044)
- Theses and Dissertations (8341)
- IGC Proceedings (1993-2023) (7001)
- Research Collection School Of Computing and Information Systems (6891)
- Thin Sections (5745)
-
- Electronic Theses and Dissertations (4194)
- Faculty Publications (3783)
- Journal of System Simulation (3363)
- 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 (2158)
- Faculty of Informatics - Papers (Archive) (2013)
- Physics Faculty Publications (1942)
- Bulletin of the Mineral Research and Exploration (1893)
- Doctoral Dissertations (1882)
- Dissertations, Theses, and Masters Projects (1876)
- Reports (1835)
- Dissertations (1816)
- 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 (1476)
- All Graduate Theses and Dissertations, Spring 1920 to Summer 2023 (1427)
- Publication Type
Articles 292891 - 292920 of 302511
Full-Text Articles in Physical Sciences and Mathematics
Substituent Effects On The Magnetic Resonance Spectra Of 1, 4-Disubstituted Benzenes, Holger Er-Chah Chen
Substituent Effects On The Magnetic Resonance Spectra Of 1, 4-Disubstituted Benzenes, Holger Er-Chah Chen
Doctoral Dissertations
"The Nuclear Magnetic Resonance spectra of five complete series of para-substituted benzenes have been investigated: the benzoic acids, benzonitriles, benzoyl chlorides, methyl benzoates and nitrobenzenes. Precise values of aromatic proton chemical shifts and coupling constants were obtained from LAOCOON3 computer analyses of the spectra. Using the relative internal chemical shift technique of Beachell and Beistel, excellent linear correlations among all five series were found. All substituents gave proton shifts which lay on the least-squares line, so it is concluded that all substituents are well behaved. Using the correlation plots the chemical shifts of the aromatic ring protons can be predicted …
Wall Rock Geochemistry Of The Chester Vein, Sunshine Mine, Kellogg, Idaho, Nicholas Howard Tibbs
Wall Rock Geochemistry Of The Chester Vein, Sunshine Mine, Kellogg, Idaho, Nicholas Howard Tibbs
Doctoral Dissertations
"The Chester vein has been the major source of ore from the Sunshine mine, largest single producer of silver in the world. 425 samples of quartzite and argillite wall rocks were collected in 13 traverses across this vein on the 4400, 4600, and 4800 mining levels. These samples were analyzed for aluminum, magnesium, calcium, sodium, potassium, manganese, iron, lead, copper, and zinc by atomic absorption spectroscopy, and for silicon and sulfur by x-ray emission spectroscopy. Element distribution plots, linear correlation coefficient matrices, varimax factor analysis, and cluster analysis were employed to determine the geochemical processes that occurred in the wall …
The Jordan Canonical Form, Richard A. Freeman
Adsorption Of Dichromate At The Air-Solution Interface, Josephine Juch Wang
Adsorption Of Dichromate At The Air-Solution Interface, Josephine Juch Wang
Masters Theses
"The adsorption of dichromate ion with the surfactants, tetradecylpyridinium bromide and tetradecyltrimethylammonium bromide at the air-solution interface was studied by surface tension and turbidity measurements in order to better understand the process of ion flotation. Surface tension measurements were used to study the effect of dichromate ion concentration on precipitation in dilute surfactant solutions. At higher concentration, near and above the cmc, light scattering was used to detect precipitation. The concentration of dichromate required to cause precipitation decreases with increasing surfactant concentration until the erne is approached, after which increasing concentrations of dichromate are required with increasing concentration of surfactant. …
A Paleomagnetic Reconnaissance Of The Platoro Caldera, Southeastern San Juan Mountains, Colorado, Jimmy F. Diehl
A Paleomagnetic Reconnaissance Of The Platoro Caldera, Southeastern San Juan Mountains, Colorado, Jimmy F. Diehl
WWU Graduate School Collection
Paleomagnetic results have been obtained from twenty-five sites in intrusive and extrusive units of Oligocene age from the Platoro caldera, southwestern Colorado, All specimens from each site were subjected to af demagnetization, and the reliability of each site thereby determined. Eighteen sites gave reliable results. Because six sites from the La Jara Canyon tuff appear to have become magnetized during the same small interval of geologic time, their results were combined and their mean pole and direction used in the final calculations. The thirteen remaining reliable sites yielded a paleomagnetic pole at 84.5°N and 306.5°E (o< = 12.9°, k = 11.2). Site-mean directions have an angular standard deviation of 18°, which is considerably greater than the dispersion predicted by models based on the present geomagnetic field but consistent with results from Late Tertiary and Quaternary studies. Because site-mean directions and site poles both have Fisherian distribution, it is not possible to determine whether dipole wobble or random fluctuation caused by a changing non-dipole field could be the cause of the geomagnetic secular variation during the Oligocene; probably both contribute. Interpretations based on mid-Tertiary paleomagnetic poles are consistent with those derived from sea-floor magnetic anomaly patterns, and possibly indicate that some true polar wandering has occurred since the mid-Tertiary, Due to lack of resolution in potassium-argon dating, the polarity time-scale constructed from the Platoro caldera units can only be used as a guide for future paleomagnetic work and geological mapping in the area.
Biostratigraphy Of The Bilk Limestone (Permian), Northwestern Nevada, Erich Thomas
Biostratigraphy Of The Bilk Limestone (Permian), Northwestern Nevada, Erich Thomas
WWU Graduate School Collection
The Bilk Limestone (new manuscript name) described in this report is a carbonate sequence located in the Bilk Creek Mountains at the southernmost end of the Kings River Range (fig. 1), about 30 miles south of the town Denio in north-central Humboldt County, Nevada. This study investigates the biostratigraphy and general paleoecology of about 2900 feet of limestone of early to middle Permian (middle Wolfcampian to middle Leonardian) age. The limestone is interbedded with nodular chert and is considerably altered by faulting and fracturing with associated epigenetic dolomitization. The fossil content is varied, and in this report stress is placed …
Benthic Fish Associations On The Continental Slope Of The Middle Atlantic Bight, Douglas F. Markle
Benthic Fish Associations On The Continental Slope Of The Middle Atlantic Bight, Douglas F. Markle
Dissertations, Theses, and Masters Projects
No abstract provided.
A Comparison Of The Chlorinated Hydrocarbon Content Of Surface And Subsurface Samples In The York River, Virginia, James L. Lake
A Comparison Of The Chlorinated Hydrocarbon Content Of Surface And Subsurface Samples In The York River, Virginia, James L. Lake
Dissertations, Theses, and Masters Projects
No abstract provided.
Iodine Metabolism In Sessile Stages Of Chesapeake Bay Semaeostome Jellyfish, Janet Evelyn Olmon
Iodine Metabolism In Sessile Stages Of Chesapeake Bay Semaeostome Jellyfish, Janet Evelyn Olmon
Dissertations, Theses, and Masters Projects
No abstract provided.
An Investigation Of One And Two State Molecular Systems Based On The Results Of Elastic Differential Scattering Experiments, Stephen Michael Bobbio
An Investigation Of One And Two State Molecular Systems Based On The Results Of Elastic Differential Scattering Experiments, Stephen Michael Bobbio
Dissertations, Theses, and Masters Projects
No abstract provided.
Reactions Of Trichloro(Beta-Diketonato)Titanium(Iv) Complexes With Alcohols In The Presence Of Pyridine, William R. C. Munsey
Reactions Of Trichloro(Beta-Diketonato)Titanium(Iv) Complexes With Alcohols In The Presence Of Pyridine, William R. C. Munsey
Dissertations, Theses, and Masters Projects
No abstract provided.
Purification And Inhibition Study Of Xanthine Oxidase, Porn Paul Israngkun Na Ayudthaya
Purification And Inhibition Study Of Xanthine Oxidase, Porn Paul Israngkun Na Ayudthaya
All Master's Theses
The paper describes a new and improved method of isolating and purifying xanthine oxidase and includes inhibition studies involving a number of reagents which are structurally related to the substrate or to other inhibitors of xanthine oxidase. The inhibitors studied are classified as to type, and inhibitor constants are reported.
Glucose-6-Phosphate Hydrolysis By A Soluble Fraction From Brassica Nigre, Edwrd Pak-Tung Lau
Glucose-6-Phosphate Hydrolysis By A Soluble Fraction From Brassica Nigre, Edwrd Pak-Tung Lau
All Master's Theses
Glucose-6-P occupies a strategic crossroad position in a variety of carbohydrate metabolic pathways. This hexosephosphate ester may serve as a substrate for glycogen synthesis (1), glycolysis (2), or oxidation through the pentose shunt. This ester may also undergo hydrolysis to form glucose (3). The last process is the terminal reaction in glucose synthesis from gluconeogenesis and glycogenolysis and is catalyzed by glucose6-phosphatase.
Cass County, Weeping Water, R. K. Pabian
Cass County, Weeping Water, R. K. Pabian
Conservation and Survey Division
No abstract provided.
Nebraska Groundwater Level (Decline & Rise), 1972
Nebraska Groundwater Level (Decline & Rise), 1972
Conservation and Survey Division
No abstract provided.
Location Of Registered Irrigation Wells In Nebraska As Of 1972
Location Of Registered Irrigation Wells In Nebraska As Of 1972
Conservation and Survey Division
No abstract provided.
Total Number Of Irrigation Wells Located In Nebraska Counties As Of 1972
Total Number Of Irrigation Wells Located In Nebraska Counties As Of 1972
Conservation and Survey Division
No abstract provided.
Statewide Precipitation And Discharge Of Platte River Above Ashland, Bryce B. Pease
Statewide Precipitation And Discharge Of Platte River Above Ashland, Bryce B. Pease
Conservation and Survey Division
No abstract provided.
Interbasin Water Transfers And Groundwater Regulation In Nebraska, D. D. Axthelm, V. H. Dreeszen, C. A. Lewis
Interbasin Water Transfers And Groundwater Regulation In Nebraska, D. D. Axthelm, V. H. Dreeszen, C. A. Lewis
Conservation and Survey Division
On November 29, 1971, the Hamilton County Ground Water Con·servation District sponsored a meeting on groundwater management and regulation. The meeting was held at Aurora, Nebraska, and was designed for irrigators from groundwater conservation districts and county irrigation associations. Various men from state and federal agencies spoke about a variety of problems that a.re related to groundwater management. Two of the talks that were presented at the meeting are reproduced here, as is a discussion of the rules and regulations that relate to the use of groundwater in the state of Nebraska.
Hace Un Siglo Que Partió El Barco Oceanográfico Challenger, Aldemaro Romero Jr.
Hace Un Siglo Que Partió El Barco Oceanográfico Challenger, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Clay Mineralogy Of Late Pleistocene Sequences In Northwestern Washington And Southwestern British Columbia, Michael Arthur Hepp
Clay Mineralogy Of Late Pleistocene Sequences In Northwestern Washington And Southwestern British Columbia, Michael Arthur Hepp
WWU Graduate School Collection
Pleistocene clay-bearing sediments of parts of northwestern Washington and southwestern British Coliambia were studied in an attempt to determine the clay mineral composition of these units; the origin of these clay minerals; and any correlation between clay mineral composition, sediment type, location, or probable geologic history of the sediments. The Pleistocene stratigraphy of the area is fairly well known, although in some specific locations the stratigraphy has not been determined. Recorded work in the region dates back to Dawson (1887). The units studied range in age from the greater than 50,000 year old Double Bluff Drift to Holocene (Recent) river …
A Sedimentary Core Analysis Of Late Pleistocene To Recent Sediments In A Portion Of Bellingham Bay, Washington, James T. Lowe
A Sedimentary Core Analysis Of Late Pleistocene To Recent Sediments In A Portion Of Bellingham Bay, Washington, James T. Lowe
WWU Graduate School Collection
Sub-bottom profiles and core sampling indicate that a trough-like depression below the bay near South Bellingham is a Pleistocene erosional paleotopographic surface sloping bayward from the uplandds to the east. A series of Late Pleistocene glacial till and glaciomarine deposits overlie the erosional surface and fill the depression. The glacial deposits are overlain by Recent sand and mud deposits which are rich in wood fragments and shell materials.
Bellingham Bay is basin-shaped with a deep narrow trough to the west. The Pleistocene basement is generally structureless and conforms to the bay bottom. Several trough shaped depressions which are overlain by …
Paleomagnetism Of The Snoqualmie Batholith Central Cascades, Washington, Suzanne J. Beske
Paleomagnetism Of The Snoqualmie Batholith Central Cascades, Washington, Suzanne J. Beske
WWU Graduate School Collection
Paleomagnetic results have been obtained from eight sites in the Miocene (15-18 m.y.) Snoqualmie batholith, Central Cascades, Washington. After ac magnetic cleaning, four magnetically stable sites remained, yielding a pole at 221.0°E, 84.5°N, (δp = 7.9, δm = 9.3, k = 286.4). A stability test was formulated based on the ratio of the intensity of natural remanent magnetism, NRM, (after ac demagnetization) to the weak field susceptibility. This ratio, Qd proved effective in determining magnetically stable samples from samples showing a wide spectrum of stability from within the Snoqualmie batholith, and therefore, was strictly applied to all …
On The Mechanism Of The Diels-Alder Reaction--Dimerization Of Trans-Phenylbutadiene, Michael Ward Mcnicholas
On The Mechanism Of The Diels-Alder Reaction--Dimerization Of Trans-Phenylbutadiene, Michael Ward Mcnicholas
Dissertations and Theses
The Diels-Alder dimerization of trans-1-substituted butadienes is expected to yield a cyclohexene adduct with the substituents in the 3 and 4 positions cis to one another. This prediction is based on past observations of other Diels-Alder additions. The cis-isomer is the only one consistent with a two-stage mechanism proposed by Woodward and Katz.
In the case of trans-phenylbutadiene, the expected adduct is cis-3-phenyl 1-4-(trans-styry1) cyclohexene. Alder, Haydn and Vogt, however, reported that the corresponding trans-isomer is the dimerization product. There is reason to believe that the observation of the trans-isomer may have been the result of product isomerization during purification. …
Kinetics Of The Cope Rearrangement Of 3,4-Diphenylhexa-1,5-Diene, Harlan Albert Jerome Berg
Kinetics Of The Cope Rearrangement Of 3,4-Diphenylhexa-1,5-Diene, Harlan Albert Jerome Berg
Dissertations and Theses
Kinetics investigations of the thermal Cope rearrangement of meso-and d1-3,4-diphenylhexa-1,5-dienes were undertaken in order to gain information about the transition states for these reactions by determining the appropriate enthalpies and entropies of activation. Of particular interest were the activation parameters for the meso compounds' rearrangement as it represents the only known example in which both four-and six-centered transition states are of comparable energy.
Kinetics of the dl isomers' rearrangement in the temperature range 90-110⁰were determined using 5 X 10¯⁵M solutions of the olefin in heptane contained within sealed Pyrex ampules. Extents of reaction were determined from UV absorbance measurements at …
The Geology Of The Southeast Quarter Of The Bone Mountain Quadrangle, Oregon, Richard Cortland Kent
The Geology Of The Southeast Quarter Of The Bone Mountain Quadrangle, Oregon, Richard Cortland Kent
Dissertations and Theses
This thesis is a study of the geology of the southeast quarter of the Bone Mountain Quadrangle. The bedrock geology mapped includes about 56 square miles.The Klamath Mountain and Coast Range Provinces of southwestern Oregon are represented in the area. Rocks in the area include the Rogue, Dothan Riddle, Days Creek, upper member of the Umpqua and Tyee Formations. The ages of these rocks range from Late Jurassic to middle Eocene. Late Jurassic ultramafic and mafic intrusive rocks associated with the Rogue Formation occur in the Klamath Province. The metavolcanics of the Rogue Format ion and an associated linear belt …
Time-Dependent Ionization Equilibrium And Line Radiation Under Flarelike Conditions, Menas Kafatos, W. H. Tucker
Time-Dependent Ionization Equilibrium And Line Radiation Under Flarelike Conditions, Menas Kafatos, W. H. Tucker
Mathematics, Physics, and Computer Science Faculty Articles and Research
The results of calculations for time-dependent ionization equilibrium and line emission are presented and compared with the values obtained under the assumption that steady-state conditions prevail. In the models considered, it is assumed that the electron density is constant (=10^3 cm^-3) and that the temperature increases by a factor of 10 from 3 x 10^6 K on timescales ranging from 100 to 300 s and decays back to 3 x 10^6 K on a timescale ranging from 600 to 1400 s. Ions of oxygen and silicon are considered, and it is found that the spectrum is softer during the rise …
Les Surfaces Cuticulaires Des Gnathopodes De Deux Crustacés Amphipodes: Niphargus (Gammaridé Hypogé) Et Gammarus (Gammaridé Épigé), Evelyne Sellem
Les Surfaces Cuticulaires Des Gnathopodes De Deux Crustacés Amphipodes: Niphargus (Gammaridé Hypogé) Et Gammarus (Gammaridé Épigé), Evelyne Sellem
International Journal of Speleology
Niphargus virei and N. schellenbergi (hypogean Gammarids) as also Gammarus pulex pulex (epigean Gammarid) show on the Gn1 and Gn2 of both sexes ornamented areas which were studied with a scanning electron microscope. The ornamentations are built up of teeth. These are simple in Gammarus pulex pulex and present a sexual dimorphism on the meropodite. In N. schellenbergi and N. virei they are as often as not grouped by three. In Orchestia (Talitrid) the teeth have their bases fusioned which forms pectinate scales showing a sexual dimorphism. Outside these areas, the gnathopod cuticle of N. virei, N. schellenbergi and …
The Evolution Of The Eastern North American Isopods Of The Genus Asellus (Crustacea: Asellidae). Part I, Laurence E. Fleming
The Evolution Of The Eastern North American Isopods Of The Genus Asellus (Crustacea: Asellidae). Part I, Laurence E. Fleming
International Journal of Speleology
This paper is the first in a three part series concerned with the evolution of North American isopods of the genus Asellus. It contains the descriptions of four new species of isopods and a list of pertinent new range data of presently known species.
Biospeologica Sovietica L: Une Nouvelle Espèce Cavernicole De Harpolithobius (Chilopoda, Lithobiidae) Du Caucase, Harpolithobius Birsteini N.Sp., N. T. Zalesskaja
Biospeologica Sovietica L: Une Nouvelle Espèce Cavernicole De Harpolithobius (Chilopoda, Lithobiidae) Du Caucase, Harpolithobius Birsteini N.Sp., N. T. Zalesskaja
International Journal of Speleology
A new troglobite species belonging to the genus Harpolithobius has been discovered during a recent biological exploration of Caucasian caves; 1 male and 2 females were collected in Avidzba cave and are described here. Harpolithobius birsteini n.sp. is the second troglobiotic Lithobiid known from Soviet caves. The other species collected must be considered as mere troglophilous.