Physical Sciences and Mathematics | Open Access Articles

The Smarandache Semantic Paradox, Anthony Begay

Humanistic Mathematics Network Journal

No abstract provided.

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Mr. Trapezoid's Walk, Michael Pillar

Humanistic Mathematics Network Journal

No abstract provided.

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Geometric Shapes, Sam Dudley

Humanistic Mathematics Network Journal

No abstract provided.

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Fun With Algebra!, Janelle Kulik

Humanistic Mathematics Network Journal

No abstract provided.

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Poem, Natalie Kashhefi

Humanistic Mathematics Network Journal

No abstract provided.

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Separating Baroclinic Flow From Tidally Induced Flow In Estuaries, Chunyan Li, Arnoldo Valle-Levinson, Kuo Chuin Wong, Kamazima M. M. Lwiza

CCPO Publications

A simple method is used to separate the tidally induced and density-driven subtidal flows in a coastal plain estuary. This method is applicable to weak wind conditions and to systems with appreciable fortnightly variation of tidal amplitude. The baroclinic density-driven motion is assumed to depend on the river discharge, which generates a horizontal density gradient, and is weakened by vertical mixing, which in turn depends on tidal forcing. The barotropic tidally induced motion is assumed to be a function of the tidal amplitude. By Taylor series expansions, two equations are obtained. These equations show the dependence of the tidally induced …

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The Probe, Issue 188 – May 1998

The Probe: Newsletter of the National Animal Damage Control Association

Woodchuck Control, Then and Now -- Clarence E. Faulkner, NADCA Regional Director, Region 0 (Agency Liaison/Foreign)
Thoughts... Robert H. Giles, Jr., President, NADCA
Legislative Update-CJ NWCO ASSN Responds to Regulatory Changes
Booklet Review: "Missouri Coyotes—A Guide to Management, Nuisance Prevention, and Damage Control" By Ron McNeely, Missouri Conservation Commission, 1997. 32 pp. ($1.00)
ADC on the NET: Dogs Useful in Canada Goose Control
Outdoor Channel, WLFA Team Up

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Tropospheric Sulfate Distribution During Success: Contributions From Jet Exhaust And Surface Sources, Jack E. Dibb, R. Talbot, M Loomis

Earth Sciences

The distribution of SO₄⁼ aerosol over the central US during SUCCESS indicates that surface sources of SO₄⁼ and SO₂ in the western US caused SO₄⁼ enhancements up to 10 km altitude. The mean (median) SO₄⁼ mixing ratio in the mid- and upper-troposphere increased from 24 (16) pptv over the Pacific ocean to 58 (29) pptv over the central plains. Above 10 km the SO₄⁼mixing ratio was essentially the same in both regions, and also when the geographic classifications were further partitioned into upper tropospheric and lower stratospheric categories …

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Optimizing Orthogonal Persistence For Java (M.S. Thesis), Kumar Jagadeeshwaraiah Brahnmath

Department of Computer Science Technical Reports

No abstract provided.

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New Limits For Neutrinoless Tau Decays, D. W. Bliss, Kenneth A. Bloom, Cleo Collaboration

Kenneth Bloom Publications

Neutrinoless 3-prong tau lepton decays into a charged lepton and either two charged particles or one neutral meson have been searched for using 4.79 fb^-1 of data collected with the CLEO II detector at Cornell Electron Storage Ring. This analysis represents an update of a previous study and the addition of six decay channels. In all channels the numbers of events found are compatible with background estimates and branching fraction upper limits are set for 28 different decay modes. These limits are either more stringent than those set previously or represent the first attempt to find these decays.

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Field-Induced Transverse Spin Ordering In Febr2, O. Petracie, Christian Binek, Wolfgang Kleemann, U. Neuhausen, H. Lueken

Christian Binek Publications

Weak first-order phase transitions from axial to oblique spin ordering in FeBr2 are evidenced by superconducting quantum interference device magnetometry in axial fields H₁(T) above the multicritical point, H_m=2.4 MA/m, T_m=4.6 K, and below the antiferro-to-paramagnetic phase line, H_c (T), in agreement with recent specific-heat data [H. Aruga Katori, K. Katsumata, and M. Katori, Phys. Rev. B 54, R9620 (1996)]. The ordering of the in-plane moments is probably due to nondiagonal coupling to the longitudinal ones, both of which increase discontinuously at H₁ (T) only under …

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High Mobility Algan/Gan Heterostructures Grown By Gas-Source Molecular Beam Epitaxy, L. K. Li, J. Alperin, W. I. Wang, David C. Look, Donald C. Reynolds

Physics Faculty Publications

We report on the growth of high electron mobility AlGaN/GaN heterostructures on sapphire substrates by gas-source molecular beam epitaxy (GSMBE) using ammonia as the nitrogen source. Improvements in structural, electrical, and optical properties of GaN and AlGaN layers have been made to achieve this goal. For the growth of AlGaN layers, the reflection high-energy electron diffraction revealed a twofold surface reconstruction, indicative of atomic smoothness of the film surface. High mobility two-dimensional electron gas has been achieved in both unintentionally doped (by piezoelectric effect induced by lattice mismatch strain) and modulation doped AlGaN/GaN heterostructures. The modulation-doped n+-Al_0.2Ga …

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Neutral-Donor-Bound-Exciton Complexes In Zno Crystals, D. C. Reynolds, David C. Look, B. Jogai, C. W. Litton, T. C. Collins, W. C. Harsch, G. Cantwell

Physics Faculty Publications

Neutral-donor–bound-exciton transitions have been observed in ZnO. The isolated neutral donors are made up of defect pair complexes. The neutral-donor nature of these pair complexes was determined from magneticfield measurements and from two-electron transitions. Excited states of the neutral-donor bound excitons were observed in the form of rotator states analogous to rotational states of the H₂ molecule.

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Congestion Control For Self-Similar Network Traffic, Tsunyi Tuan, Kihong Park

Department of Computer Science Technical Reports

No abstract provided.

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Paleocene Mammalian Biostratigraphy Of The Carbon Basin, Southeastern Wyoming, And Age Constraints On Local Phases Of Tectonism, Ross Secord

Department of Earth and Atmospheric Sciences: Faculty Publications

Mammalian fossils from two principal collecting areas in the lower Hanna Formation of the Carbon Basin comprise three faunas, the Grayson Ridge, Halfway Hill, and Sand Creek faunas. The Grayson Ridge and Halfway Hill faunas are diverse, consisting cumulatively of 29 mammalian species, at least two of which are new. The faunas are approximately equivalent in age and are either latest Torrejonian or earliest Tiffanian, or possibly sample both NALMAs. In any event, the faunas are very close in age to the lbrrejonian-Tiffanian boundary. Strata bearing the Grayson Ridge and Halfway Hill faunas were truncated by erosion, resulting in a …

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Nobel Prize Winners In Physics From 1901 To 1990: Simple Statistics For Physics Teachers, Weijia Zhang, Robert Fuller

Robert G. Fuller Publications

A demographic database for the 139 Nobel prize winners in physics from 1901 to 1990 has been created from a variety of sources. The results of our statistical study are discussed in the light of the implications for physics teaching.

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Particulate Sizing And Emission Indices For A Jet Engine Exhaust Sampled At Cruise, Donald E. Hagen, Philip D. Whitefield, Jonathan D. Paladino, Max B. Trueblood

Physics Faculty Research & Creative Works

Particle size and emission indices measurements for jet engines, primarily the Rolls Royce RB211 engines on a NASA 757 aircraft are reported. These data were used to estimate the fraction of fuel sulfur that was converted to particulates. These measurements were made in-situ with the sampling aircraft several kilometers behind the source. Some complimentary ground measurements on the same source aircraft and engines are also reported. Significant differences are seen between the ground observations and the in-situ observations, indicating that plume processes are changing the aerosol's characteristics.

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Sources And Chemistry Of Noₓ In The Upper Troposphere Over The United States, Lyatt Jaegle, Daniel J. Jacob, Yuhua Wang, Andrew J. Weinheimer, Brian A. Ridley, Teresa L. Campos, Glen W. Sachse, Donald E. Hagen

Physics Faculty Research & Creative Works

The origin of NO_x in the upper troposphere over the central United States is examined using aircraft observations obtained during the SUCCESS campaign in April–May of 1996. Correlations between NO_y (sum of NO_x and its oxidation products) and CO at 8–12 km altitude indicate that NO_x originates primarily from convective transport of polluted boundary layer air. Lightning and aircraft emissions appear to be only minor sources of NO_x. Chemical steady state model calculations constrained by local observations of NO underestimate the measured NO_x/NO_y concentration ratio at 8–12 km altitude by a …

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Plant-Availability Fractionation Of Nickel For Bioremediation, Jason Henrie

Undergraduate Honors Capstone Projects

The bioremediation of contaminated soils or the biomining of waste tillings has been explored through the use of hyperaccumulating plants such as S. polygaloides which is a nickel hyperaccumulator. However, it is important to discover which soils are well-suited for this type of process by determining the plant-availability of the nickel. By extracting the nickel sequentially with increasing severity it is possible to determine the chemical distribution, or fractionation, of nickel in a soil. One fraction is already suspected to be plant-available and correlates very well with the results of a previous plant-availability study. A calcareous Millville silt loam which …

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Thermal Decomposition Of Cp*Re(Co)(No)No2, Kale Allen Swainston

Undergraduate Honors Capstone Projects

The focus of this work is to examine the thermal reactivity of the Cp*Re(CO)(NO)NO₂ complex. Upon heating with a flame, the orange crystals decompose very rapidly, with a darkening of color and gas production. To investigate this reaction, the decomposition was carefully controlled by heating with N2 gas, and in heated solution. The products obtained from the heated solution were purified using column chromatography, yielding two new interesting compounds, believed to be Cp*ReNO dimers with bridging oxygens.

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Site-Directed Mutagenesis Of The Nitrogenase Fe-Protein From Azotobacter Vinelandii, Talmage L. Shill

Undergraduate Honors Capstone Projects

Nitrogen fixation is the chemical reaction of dinitrogen (N₂) being reduced to ammonia (NH₃). This reaction occurs naturally by nitrogen fixing microorganisms which contain the enzyme nitrogenase. The overall reaction is written below.

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The Growth Of Strained Thin Films Of Gadolinium, C. Waldfried, O. Zeybek, T. Bertrams, S.C. Barrett, Peter A. Dowben

Peter Dowben Publications

The growth of strained thin films of gadolinium has been investigated with low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM) and compared to the film growth of unstrained gadolinium. Strained thin films of gadolinium are distinct from the unstrained films by a substrate induced preferential domain growth direction, which is also reflected in the electronic structure.

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The Spin Polarized Band Structure Of Strained Thin Films Of Gadolinium, C. Waldfried, Elio Vescovo, Peter A. Dowben

Peter Dowben Publications

The magnetic properties of strained thin films of gadolinium are characterized by a wave vector and thickness dependence of the exchange splitting. The spin-resolved band structure has been mapped by spin polarized photoemission, and provides considerable insight into the relationship between magnetism of local moment systems, and band structure.

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Effects Of Thinning And Nitrogen Fertilization On Sugars And Terpenes In Douglas-Fir Vascular Tissues: Implications For Black Bear Foraging, Bruce A. Kimball, Eric C. Turnblom, Dale L. Nolte, Doreen L. Griffin, Richard M. Engeman

United States Department of Agriculture Wildlife Services: Staff Publications

The chemical constituents of coniferous vascular tissues play a role in bear forage selection. In particular, bear foraging preferences are related to the concentrations of simple sugars (nonstructural carbohydrates) and terpenes in the forage. Analyses of vascular tissue samples from trees collected in test plots indicted that both thinning and fertilization caused the sugar concentration of vascular tissues in the lower bole to increase. However, these treatments had no effect on the concentrations of hydrocarbon monoterpenes, oxygenated monoterpenes, or sesquiterpenes. These results may explain the observations that black bears prefer to forage in thinned and fertilized stands.

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Chemically Mediated Foraging Preference Of Black Bears ( Ursus Americanus), Bruce A. Kimball, Dale L. Nolte, Richard M. Engeman, John J. Johnston, Frank R. Stermitz

United States Department of Agriculture Wildlife Services: Staff Publications

The role of chemical constituents in the foraging behavior of black bears (Ursus americanus) was investigated using two field studies. Vascular tissue samples were collected from Douglas-fir (Pseudotsuga menziesii) trees recently foraged by black bears. Samples were extracted and analyzed by liquid and gas chromatography to determine carbohydrates and terpenes, respectively. Chemical data were subjected to correlation analyses and multiple regression to examine if they adequately describe observed foraging preferences. Free-ranging black bears also were offered a choice of four test diets that differed in content of carbohydrates and terpenes. Results indicated that forage preferences were …

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Particle Concentration Characterization For Jet Engine Emissions Under Cruise Conditions, Jonathan D. Paladino, Philip D. Whitefield, Donald E. Hagen, Alfred R. Hopkins, Max B. Trueblood

Chemistry Faculty Research & Creative Works

Airborne particle measurements during NASA project SUCCESS have shown that particle concentration profiles serve as good indicators of aircraft exhaust plume encounters. During exhaust plume penetrations there is a strong anticorrelation between the ratio of nonvolatile/total particulates and Nitrogen Oxide (NO) concentrations. an increase in fuel sulfur content was found to increase the total particle emission index, while the nonvolatile emission index remained unchanged. the EI's increased by a factor of 2.6 as the fuel sulfur increased from 70 - 700 ppm. the large particle size distribution (200-400 nm) was seen as a good long term indicator of an aircraft …

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Quantitative And Stereoisomeric Determination Of Light Biomarkers In Crude Oil And Coal Samples, Alain Berthod, Xiande Wang, Kyung H. Gahm, Daniel W. Armstrong

Chemistry Faculty Research & Creative Works

Indans and tetralins are considered biological markers (biomarkers). These C9-C11 hydrocarbons are present in small amounts in organic geological samples. Methyl substituted indans or tetralins may possess a stereogenic center (carbon). Thus they can exist as enantiomers and, in the case of disubstituted enties, also as diastereoisomers. The concentrations of 1-methylindan, 1,3-dimethylindan, 1-methyltetralin, and 2-methyltetralin were determined in 16 crude oil samples of different sources and in 14 coal samples of different sources and ranks. Deuterated homologues were synthesized as standards to spike the samples and to assure accurate quantitative analysis. A procedure using HPLC fractionation followed by GC/MS analysis …

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Deep Centers In N-Gan Grown By Reactive Molecular Beam Epitaxy, Z-Q. Fang, David C. Look, W. Kim, Z. Fan, A. Botchkarev, H. Morkoç

Physics Faculty Publications

Deep centers in Si-doped n-GaN layers grown by reactive molecular beam epitaxy have been studied by deep-level transient spectroscopy as a function of growth conditions. Si-doped GaN samples grown on a Si-doped n⁺-GaN contact layer at 800 °C show a dominant trap C₁ with activation energy E_T = 0.44 eV and capture cross-section σ_T = 1.3×10⁻¹⁵ cm⁻², while samples grown at 750 °C on an undoped semi-insulating GaN buffer show prominent traps D₁ and E₁, with E_T = 0.20 eV and σ_T = 8.4×10⁻¹⁷ cm …

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Mammals [Of The Sand Hills], Patricia W. Freeman

School of Natural Resources: Faculty Publications

Of approximately 81 species of mammals present in Nebraska today, 55 occur in the Sand Hills, with an additional three species that are associated only with the Niobrara River. Nebraska as a whole is truly a crossroads for mammals because two-thirds of the species reach their distributional limits in the state (Jones, 1964). Most of these mammals are widespread species or are specific to the grasslands as a whole and are not affected by this sandy zone. Jones (1964) wrote that “only a few mammals are restricted to this area. Mostly it serves to filter western species moving east and, …

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Confocal Microscopy: A Powerful Tool For Biological Research, Amit Singh, K. P. Gopinathan

Biology Faculty Publications

Conventional light microscopy allows the observation of living as well as fixed cells and tissues to generate two-dimensional images. The out-of-focus information often obscures the ultrastructural details, especially in thick specimens with overlapping structures. The earliest available light microscopy visualized the objects in hydrated state in two-dimensions during their temporal development. The emergence of electron microscopy (EM) provided superb resolution of ultrastructural details, but it was applicable only for objects in the dehydrated state and thereby potentially introducing handling artifacts. The usefulness of optical methods, however, has been limited by the poor depth discrimination. Often, the fluorescence and reflectance images …

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Full-Text Articles in Physical Sciences and Mathematics

The Smarandache Semantic Paradox, Anthony Begay

Humanistic Mathematics Network Journal

Mr. Trapezoid's Walk, Michael Pillar

Humanistic Mathematics Network Journal

Geometric Shapes, Sam Dudley

Humanistic Mathematics Network Journal

Fun With Algebra!, Janelle Kulik

Humanistic Mathematics Network Journal

Poem, Natalie Kashhefi

Humanistic Mathematics Network Journal

Separating Baroclinic Flow From Tidally Induced Flow In Estuaries, Chunyan Li, Arnoldo Valle-Levinson, Kuo Chuin Wong, Kamazima M. M. Lwiza

CCPO Publications

The Probe, Issue 188 – May 1998

The Probe: Newsletter of the National Animal Damage Control Association

Tropospheric Sulfate Distribution During Success: Contributions From Jet Exhaust And Surface Sources, Jack E. Dibb, R. Talbot, M Loomis

Earth Sciences

Optimizing Orthogonal Persistence For Java (M.S. Thesis), Kumar Jagadeeshwaraiah Brahnmath

Department of Computer Science Technical Reports

New Limits For Neutrinoless Tau Decays, D. W. Bliss, Kenneth A. Bloom, Cleo Collaboration

Kenneth Bloom Publications

Field-Induced Transverse Spin Ordering In Febr2, O. Petracie, Christian Binek, Wolfgang Kleemann, U. Neuhausen, H. Lueken

Christian Binek Publications

High Mobility Algan/Gan Heterostructures Grown By Gas-Source Molecular Beam Epitaxy, L. K. Li, J. Alperin, W. I. Wang, David C. Look, Donald C. Reynolds

Physics Faculty Publications

Neutral-Donor-Bound-Exciton Complexes In Zno Crystals, D. C. Reynolds, David C. Look, B. Jogai, C. W. Litton, T. C. Collins, W. C. Harsch, G. Cantwell

Physics Faculty Publications

Congestion Control For Self-Similar Network Traffic, Tsunyi Tuan, Kihong Park

Department of Computer Science Technical Reports

Paleocene Mammalian Biostratigraphy Of The Carbon Basin, Southeastern Wyoming, And Age Constraints On Local Phases Of Tectonism, Ross Secord

Department of Earth and Atmospheric Sciences: Faculty Publications

Nobel Prize Winners In Physics From 1901 To 1990: Simple Statistics For Physics Teachers, Weijia Zhang, Robert Fuller

Robert G. Fuller Publications

Particulate Sizing And Emission Indices For A Jet Engine Exhaust Sampled At Cruise, Donald E. Hagen, Philip D. Whitefield, Jonathan D. Paladino, Max B. Trueblood

Physics Faculty Research & Creative Works

Sources And Chemistry Of Noₓ In The Upper Troposphere Over The United States, Lyatt Jaegle, Daniel J. Jacob, Yuhua Wang, Andrew J. Weinheimer, Brian A. Ridley, Teresa L. Campos, Glen W. Sachse, Donald E. Hagen

Physics Faculty Research & Creative Works

Plant-Availability Fractionation Of Nickel For Bioremediation, Jason Henrie

Undergraduate Honors Capstone Projects

Thermal Decomposition Of Cp*Re(Co)(No)No2, Kale Allen Swainston

Undergraduate Honors Capstone Projects

Site-Directed Mutagenesis Of The Nitrogenase Fe-Protein From Azotobacter Vinelandii, Talmage L. Shill

Undergraduate Honors Capstone Projects

The Growth Of Strained Thin Films Of Gadolinium, C. Waldfried, O. Zeybek, T. Bertrams, S.C. Barrett, Peter A. Dowben

Peter Dowben Publications

The Spin Polarized Band Structure Of Strained Thin Films Of Gadolinium, C. Waldfried, Elio Vescovo, Peter A. Dowben

Peter Dowben Publications

Effects Of Thinning And Nitrogen Fertilization On Sugars And Terpenes In Douglas-Fir Vascular Tissues: Implications For Black Bear Foraging, Bruce A. Kimball, Eric C. Turnblom, Dale L. Nolte, Doreen L. Griffin, Richard M. Engeman

United States Department of Agriculture Wildlife Services: Staff Publications

Chemically Mediated Foraging Preference Of Black Bears ( Ursus Americanus), Bruce A. Kimball, Dale L. Nolte, Richard M. Engeman, John J. Johnston, Frank R. Stermitz

United States Department of Agriculture Wildlife Services: Staff Publications

Particle Concentration Characterization For Jet Engine Emissions Under Cruise Conditions, Jonathan D. Paladino, Philip D. Whitefield, Donald E. Hagen, Alfred R. Hopkins, Max B. Trueblood

Chemistry Faculty Research & Creative Works

Quantitative And Stereoisomeric Determination Of Light Biomarkers In Crude Oil And Coal Samples, Alain Berthod, Xiande Wang, Kyung H. Gahm, Daniel W. Armstrong

Chemistry Faculty Research & Creative Works

Deep Centers In N-Gan Grown By Reactive Molecular Beam Epitaxy, Z-Q. Fang, David C. Look, W. Kim, Z. Fan, A. Botchkarev, H. Morkoç

Physics Faculty Publications

Mammals [Of The Sand Hills], Patricia W. Freeman

School of Natural Resources: Faculty Publications

Confocal Microscopy: A Powerful Tool For Biological Research, Amit Singh, K. P. Gopinathan

Biology Faculty Publications