Physical Sciences and Mathematics | Open Access Articles

Avian Use Of Field Windbreaks, Herbaceous Fencerows And Associated Cropfields In East Central Nebraska, Natalie J. Sunderman

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

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Avian Use Of Riparian Corridors And Adjacent Cropland In East-Central Nebraska, Rebecca L. Fitzmaurice

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

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Numerical Results For The Ground-State Interface In A Random Medium, Alan Middleton

Physics - All Scholarship

The problem of determining the ground state of a $d$-dimensional interface embedded in a $(d+1)$-dimensional random medium is treated numerically. Using a minimum-cut algorithm, the exact ground states can be found for a number of problems for which other numerical methods are inexact and slow. In particular, results are presented for the roughness exponents and ground-state energy fluctuations in a random bond Ising model. It is found that the roughness exponent $\zeta = 0.41 \pm 0.01, 0.22 \pm 0.01$, with the related energy exponent being $\theta = 0.84 \pm 0.03, 1.45 \pm 0.04$, in $d = 2, 3$, respectively. These …

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B_S Mixing Via Ψ K*, Patricia Mcbride, Sheldon Stone

Physics - All Scholarship

The decay mode Bs à ψ K*is suggested as a very good way to measure the Bs mixing parameter xs. These decays can be gathered using a ψ → ℓ+ℓ− trigger. This final state has a well resolved four track decay vertex, useful for good time resolution and background rejection.

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Studies On The Cyclization Of Cis-1,4-Dichloro-2-Butene With Sodium Dialkylmalonates, Hovis M. E. Imade

Master's Theses

No abstract provided.

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Electrochemical Studies Of Hemoglobin And Cross-Linked Hemoglobin, Ayoola O. Alabi

Master's Theses

No abstract provided.

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Effect Of Electrolyte Concentration, Temperature And Clay Type On The Diffusional Properties Of Anions In Clay-Modified Electrodes, Jennifer A. Stein

Dissertations

No abstract provided.

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The Roepke Lecture In Economic Geography Catastrophic Earthquake Insurance: Patterns Of Adoption, Risa Palm

Geosciences Faculty Publications

In California, earthquake insurance is not mandatory and is relatively expensive. Investment in earthquake insurance is one indicator of individual/household response to hazards in the urban environment. This paper reports on a series of three surveys of California homeowners undertaken in 1989, 1990, and 1993 in Contra Costa, Santa Clara, Los Angeles, and San Bernardino counties. The surveys addressed six hypotheses: rates of insurance subscription have increased; socioeconomc and demographic characteristics distinguish the insured from the uninsured; insurance purchase is systematically related to geophysical risk at the home site; perceived risk is a predictor of insurance purchase; experience with an …

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1995 Platte River Basin Ecosystem Symposium Proceedings

Water Current Newsletter

No abstract provided.

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Geomorphic And Pedogenic Evolution In Coastal Sediments, Central California, Lynn E. Moody, R. C. Graham

Natural Resources Management and Environmental Sciences

Studies of soil chronosequences on marine terraces facilitate the use of terraces for tectonic and paleoclimatic interpretation. However, many areas on the California coast have received substantial eolian deposits after pedogenesis began, so do not qualify as chronosequences. These areas are worthy of study because they are widespread coastal landscape features, and they enable us to interpret pedogenic and geomorphic processes in sandy regolith. The objective of this study was to use soil and deep regolith morphology and chemistry to interpret pedogenic and geomorphic evolution on a sequence of four marine terraces, San Luis Obispo County, California. The terraces are …

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A Cognitive Theory Of Visual Interaction, Erika Rogers

Computer Science and Software Engineering

No abstract provided.

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Knowledge-Based Image Enhancement For Cooperative Tele-Assistance, Erika Rogers, Versonya Dupont, Robin R. Murphy, Nazir Warsi

Computer Science and Software Engineering

There is an increasing need in complex environments for computerized assistance, both for the effective filtering and display of pertinent information or data, and also for the decision-making task itself. The combination of artificial intelligence techniques with image processing and graphics capabilities provides the foundation for building intelligent systems which act as mediaries between the human and the task domain. In the field of tele-assistance, this type of system enables cooperative problem-solving between a remote semi-autonomous robot and a local human supervisor. This paper describes current work on such a system, with an emphasis on the development of knowledge-based image …

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Cooperative Assistance For Remote Robot Supervision, Erika Rogers, Robin R. Murphy, A. Stewart, Nazir Warsi

Computer Science and Software Engineering

This paper describes current work on the design of a computer system which provides cooperative assistance for the supervision of remote semi-autonomous robots. It consists of a blackboard-based framework which allows communication between the remote robot, the local human supervisor, and an intelligent mediating system, which aids interactive exception handling when the remote robot requires the assistance of the local operator.

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Addressing Problems In Evaluating Health-Relevant Programs Through Systematic Planning And Evaluation, Galen E. Cole, Chester L. Pogostin, Bonita J. Westover, Nilka M. Rios

RISK: Health, Safety & Environment (1990-2002)

The authors argue that inconsistent terminology is often a hindrance in assessing health program implementation, effectiveness and efficiency. Attending closely to this, they propose a model scheme for conducting such evaluations.

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Hga: A Hardware-Based Genetic Algorithm, Stephen D. Scott, Ashok Samal, Sharad C. Seth

CSE Conference and Workshop Papers

A genetic algorithm (GA) is a robust problem-solving method based on natural selection. Hardware's speed advantage and its ability to parallelize offer great rewards to genetic algorithms. Speedups of 1-3 orders of magnitude have been observed when frequently used software routines were implemented in hardware by way of reprogrammable field-programmable gate arrays (FPGAs). Reprogrammability is essential in a general-purpose GA engine because certain GA modules require changeability (e.g. the function to be optimized by the GA). Thus a hardware-based GA is both feasible and desirable. A fully functional hardware-based genetic algorithm (the HGA) is presented here as a proof-of-concept system. …

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A System For Recognizing A Large Class Of Engineering Drawings, Yuhong Yu, Ashok Samal, Sharad C. Seth

CSE Conference and Workshop Papers

We present a complete system for recognizing a large class of symbolic engineering drawings that includes flowcharts, chemical plant diagrams, and logic & electrical circuits. The output of the system, a netlist identifying the symbol types and interconnections, may be used for design verification or as a compact portable representation of the drawing. The automatic recognition task is done in two stages: (1) domain-independent rules segment symbols from connection lines in the preprocessed drawing image and (2) an understanding subsystem makes use of a set of domain-specific matchers to classify symbols and correct errors automatically. A graphical user interface is …

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Parallel Test Generation With Low Communication Overhead, Sivaramakrishnan Venkatraman, Sharad C. Seth, Prathima Agrawal

CSE Conference and Workshop Papers

In this paper we present a method of parallelizing test generation for combinational logic using boolean satisfiability. We propose a dynamic search-space allocation strategy to split work between the available processors. This strategy is easy to implement with a greedy heuristic and is economical in its demand for inter-processor communication. We derive an analytical model to predict the performance of the parallel versus sequential implementations. The effectiveness of our method and analysis is demonstrated by an implementation on a Sequent (shared memory) multiprocessor. The experimental data shows significant performance improvement in parallel implementation, validates our analytical model, and allows predictions …

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Preparation Of Doped Polycarbynes, Reuben D. Rieke

Chemistry Department: Faculty Publications

Polycarbynes, such as doped polycarbynes, prepared from a soluble source of electrons and an organic monomer or co-monomer containing at least one carbyne group and, optionally, containing a doping agent, in an ethereal, poly ethereal, or hydrocarbon solvent are presented. A wide variety of arylcarbyne and/or alkylcarbyne monomers and co-monomers can be combined with a source of electrons soluble in an ethereal, polyethereal, or hydrocarbon solvent to form novel polycarbyne polymers. These polycarbyne polymers can be used to form synthetic diamond materials, fibers, and other materials that can withstand extreme con ditions.

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Rapid Uplift And Rotation Of Mylonitic Rocks From Beneath A Detachment Fault: Insights From Potassium Feldspar 40ar/39ar Thermochronology, Northern Snake Range, Nevada, Jeffrey Lee

All Faculty Scholarship for the College of the Sciences

The thermal histories of mylonitic rocks from the footwall of the northern Snake Range decollement (NSRD), Nevada, were calculated using multiple diffusion domain analyses of potassium feldspar Arrhenius data and ⁴⁰Ar/³⁹Ar age spectra in order to characterize the cooling (exhumation) history of these mylonitic rocks and thereby constrain the origin and movement history of the NSRD. The calculated thermal histories, along with reported apatite fission track ages, indicate the three following episodes of rapid cooling (10–55°C/m.y.) related to extensional denudation: (1) middle Eocene (48–41 Ma), (2) late Oligocene (30–26 Ma), and (3) early Miocene (20–16 Ma). The …

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Aggregation Of Chlorophyll A Probed By Resonance Light Scattering Spectroscopy, J. C. De Paula, J. H. Robblee, Robert F. Pasternack

Chemistry & Biochemistry Faculty Works

We report the resonance light scattering (RLS) spectra of chlorophyll a aggregated in a 9:1 solution of formamide and pH 6.8 phosphate buffer. The aggregate formed after 2 h of mixing, referred to as Chl(469), shows a strong scattering feature at 469 nm (Soret band) and a much weaker feature at 699 nm (Q(y) band). A kinetic investigation confirmed that the aggregation process is cooperative, and also detected one intermediate (Chl(458)) with a strong RLS spectrum but only a weak CD spectrum. We propose that aggregation proceeds via at least three steps: 1) formation of a nucleating species, probably a …

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A Wavelet Analysis Of Pliopleistocene Climate Indicators: A New View Of Periodicity Evolution, Edward W. Bolton, Kirk A. Maasch, Jonathan M. Lilly

Earth Science Faculty Scholarship

Wavelet analysis offers an alternative to Fourier based time-series analysis, and is particularly useful when the amplitudes and periods of dominant cycles are time dependent. We analyse climatic records derived from oxygen isotopic ratios of marine sediment cores with modified Morlet wavelets. We use a normalization of the Morlet wavelets which allows direct correspondence with Fourier analysis. This provides a direct view of the oscillations at various frequencies, and illustrates the nature of the time-dependence of the dominant cycles.

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Derived Bedrock Elevations, Strain Rates And Stresses From Measured Surface Elevations And Velocities - Jakobshavns-Isbrae, Greenland, J. L. Fastook, H. H. Brecher, Terence J. Hughes

Earth Science Faculty Scholarship

Jakobshavns Isbrae (69 degrees 10'N, 49 degrees 5'W) drains about 6.5% of the Greenland ice sheet and is the fastest ice stream known. The Jakobshavns Isbrae basin of about 10 000 km(2) was mapped photogrammetrically from four sets of aerial photography, two taken in July 1985 and two in July 1986. Positions and elevations of several hundred natural features on the ice surface were determined for each epoch by photogrammetric block-aerial triangulation, and surface velocity vectors were computed from the positions. The two flights in 1985 yielded the best results and provided most common points (716) for velocity determinations and …

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Paleoglaciologys Grand Unsolved Problem, Mikhail G. Grosswald, Terence J. Hughes

Earth Science Faculty Scholarship

The paleoglaciological concept that during the Pleistocene glacial hemi-cycles a super-large, structurally complex ice sheet developed in the Arctic and behaved as a single dynamic system, as the Antarctic ice sheet does today, has not yet been subjected to concerted studies designed to test the predictions of this concept. Yet, it may hold the keys to solutions of major problems of paleoglaciology, to understanding climate and sea-level changes. The Russian Arctic is the least-known region exposed to paleoglaciation by a hypothetical Arctic ice sheet but now it is more open to testing the concept. Implementation of these tests is a …

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Changes In Continental And Sea-Salt Atmospheric Loadings In Central Greenland During The Most Recent Deglaciation: Model-Based Estimates, R. B. Alley, R. C. Finkel, K. Nishizumi, A. Anandakrishnan, C. A. Shuman, G. Mershon, G. A. Zielinski, Paul Andrew Mayewski

Earth Science Faculty Scholarship

By fitting a very simple atmospheric impurity model to high-resolution data on ice accumulation and contaminant f1uxes in the GISP2 ice core, we have estimated changes in the atmospheric concentrations of soluble major ions, insoluble particulates and ¹⁰Be during the transition from glacial to Holocene conditions. For many species, changes in concentration in the ice typically overestimate atmospheric changes, and changes in flux to the ice typically underestimate atmospheric changes, because times of increased atmospheric contaminant loading are also times of reduced snowfall. The model interpolates between the flux and concentration records by explicitly allowing [or wet- and dry- …

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Bioarchaeological And Climatological Evidence For The Fate Of Norse Farmers In Medieval Greenland, P. C. Buckland, T. Amorosi, L. K. Barlow, A. J. Dugmore, Paul Andrew Mayewski, T. H. Mcgovern, A. E. J. Ogilvie, J. P. Sadler, P. Skidmore

Earth Science Faculty Scholarship

Greenland, far north land of the Atlantic, has often been beyond the limit of European farming settlement. One of its Norse settlements, colonized just before AD 1000, is — astonishingly — not even at the southern tip, but a way up the west coast, the 'Western Settlement'. Environmental studies show why its occupation came to an end within five centuries, leaving Greenland once more a place of Arctic-adapted hunters.

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Filtration Rates Of The Zebra Mussel (Dreissena Polymorpha) On Natural Seston From Saginaw Bay, Lake Huron, David L. Fanslow, Thomas F. Nalepa, Gregory A. Lang

United States Department of Commerce: Staff Publications

Filtration rates of the zebra mussel (Dreissena polymorpha) on natural seston from two different regions in Saginaw Bay were determined on a monthly basis from April to October in 1992 and 1993. The two regions represent contrasting trophic conditions, with the inner bay more eutrophic than the outer bay. Mean filtration rate was 16.2 mL/mg/h (range 4.0 to 40.7 mL/mg/h) over the entire 2-year period. Filtration rates on seston from the inner bay were significantly lower than rates on seston from the outer bay in 1992, but no differences were apparent in 1993. Lower rates were attributed to …

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Initial Colonization Of The Zebra Mussel (Dreissena Polymorpha) In Saginaw Bay, Lake Huron: Population Recruitment, Density, And Size Structure, Thomas F. Nalepa, James A. Wojcik, David L. Fanslow, Gregory A. Lang

United States Department of Commerce: Staff Publications

The various life stages of the zebra mussel (Dreissena polymorpha) were examined during the initial years (1991-93) of the mussel's invasion into Saginaw Bay, Lake Huron. Yearly trends in densities of larvae, newly-settled juveniles, and adults were poorly related. Larval densities were lowest in 1991 and increased each year, but the number of settled juveniles was highest in 1991. Adults increased between 1991 and 1992 and then declined in 1993. Mean adult densities at sites with hard substrates were 11,700,33,200, and 4,1001m2 in each of the 3 years, respectively. Year-to-year variation at individual sites was high and likely …

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Initial Transgressive Phase Of Leg 144 Guyots: Evidence Of Extreme Sulfate Reduction, Bjørn Buchardt, Mary Anne Holmes

Department of Earth and Atmospheric Sciences: Faculty Publications

The initial transgressive phase at the Leg 144 Guyots is characterized by a typical association of sedimentary facies (from bottom to top): in situ weathered volcanic rocks; variegated clays, partly pyritic; gray clay, pyritic, homogeneous, or mottled; black clay, peaty, laminated, or bioturbated; and marine argillaceous limestone. Site 877 at Wodejebato Guyot represents the typical development of the initial transgressive phase. The black clay is rich in organic carbon (up to 40%) and sulfur (up to 25%). The organic matter is dominantly of terrestrial origin, but it has a significant marine, algal input. The variegated clays consist of a red, …

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Sharing Information Benefits The Meat Industry, Michael Paton

Journal of the Department of Agriculture, Western Australia, Series 4

Cronic health problems of livestock, seldom detected on farms, reduce the efficiency of abattoirs and returns to producers. But a major project providing information to producers from abattoirs is indicating how everyone could benefit from feedback.

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Nature Conservation In The Western Australian Wheatbelt, Max Abensperg-Traun

Journal of the Department of Agriculture, Western Australia, Series 4

Growing concern about the survival of flora and fauna in the Western Australian wheatbelt prompted CSIRO scientists to start a long-term study to moniter trends in populations. Max Abensperg-Traun and his colleagues reportt on their findings so far.

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Full-Text Articles in Physical Sciences and Mathematics

Avian Use Of Field Windbreaks, Herbaceous Fencerows And Associated Cropfields In East Central Nebraska, Natalie J. Sunderman

School of Natural Resources: Dissertations, Theses, and Student Research

Avian Use Of Riparian Corridors And Adjacent Cropland In East-Central Nebraska, Rebecca L. Fitzmaurice

School of Natural Resources: Dissertations, Theses, and Student Research

Numerical Results For The Ground-State Interface In A Random Medium, Alan Middleton

Physics - All Scholarship

B_S Mixing Via Ψ K*, Patricia Mcbride, Sheldon Stone

Physics - All Scholarship

Studies On The Cyclization Of Cis-1,4-Dichloro-2-Butene With Sodium Dialkylmalonates, Hovis M. E. Imade

Master's Theses

Electrochemical Studies Of Hemoglobin And Cross-Linked Hemoglobin, Ayoola O. Alabi

Master's Theses

Effect Of Electrolyte Concentration, Temperature And Clay Type On The Diffusional Properties Of Anions In Clay-Modified Electrodes, Jennifer A. Stein

Dissertations

The Roepke Lecture In Economic Geography Catastrophic Earthquake Insurance: Patterns Of Adoption, Risa Palm

Geosciences Faculty Publications

1995 Platte River Basin Ecosystem Symposium Proceedings

Water Current Newsletter

Geomorphic And Pedogenic Evolution In Coastal Sediments, Central California, Lynn E. Moody, R. C. Graham

Natural Resources Management and Environmental Sciences

A Cognitive Theory Of Visual Interaction, Erika Rogers

Computer Science and Software Engineering

Knowledge-Based Image Enhancement For Cooperative Tele-Assistance, Erika Rogers, Versonya Dupont, Robin R. Murphy, Nazir Warsi

Computer Science and Software Engineering

Cooperative Assistance For Remote Robot Supervision, Erika Rogers, Robin R. Murphy, A. Stewart, Nazir Warsi

Computer Science and Software Engineering

Addressing Problems In Evaluating Health-Relevant Programs Through Systematic Planning And Evaluation, Galen E. Cole, Chester L. Pogostin, Bonita J. Westover, Nilka M. Rios

RISK: Health, Safety & Environment (1990-2002)

Hga: A Hardware-Based Genetic Algorithm, Stephen D. Scott, Ashok Samal, Sharad C. Seth

CSE Conference and Workshop Papers

A System For Recognizing A Large Class Of Engineering Drawings, Yuhong Yu, Ashok Samal, Sharad C. Seth

CSE Conference and Workshop Papers

Parallel Test Generation With Low Communication Overhead, Sivaramakrishnan Venkatraman, Sharad C. Seth, Prathima Agrawal

CSE Conference and Workshop Papers

Preparation Of Doped Polycarbynes, Reuben D. Rieke

Chemistry Department: Faculty Publications

Rapid Uplift And Rotation Of Mylonitic Rocks From Beneath A Detachment Fault: Insights From Potassium Feldspar 40ar/39ar Thermochronology, Northern Snake Range, Nevada, Jeffrey Lee

All Faculty Scholarship for the College of the Sciences

Aggregation Of Chlorophyll A Probed By Resonance Light Scattering Spectroscopy, J. C. De Paula, J. H. Robblee, Robert F. Pasternack

Chemistry & Biochemistry Faculty Works

A Wavelet Analysis Of Pliopleistocene Climate Indicators: A New View Of Periodicity Evolution, Edward W. Bolton, Kirk A. Maasch, Jonathan M. Lilly

Earth Science Faculty Scholarship

Derived Bedrock Elevations, Strain Rates And Stresses From Measured Surface Elevations And Velocities - Jakobshavns-Isbrae, Greenland, J. L. Fastook, H. H. Brecher, Terence J. Hughes

Earth Science Faculty Scholarship

Paleoglaciologys Grand Unsolved Problem, Mikhail G. Grosswald, Terence J. Hughes

Earth Science Faculty Scholarship

Changes In Continental And Sea-Salt Atmospheric Loadings In Central Greenland During The Most Recent Deglaciation: Model-Based Estimates, R. B. Alley, R. C. Finkel, K. Nishizumi, A. Anandakrishnan, C. A. Shuman, G. Mershon, G. A. Zielinski, Paul Andrew Mayewski

Earth Science Faculty Scholarship

Bioarchaeological And Climatological Evidence For The Fate Of Norse Farmers In Medieval Greenland, P. C. Buckland, T. Amorosi, L. K. Barlow, A. J. Dugmore, Paul Andrew Mayewski, T. H. Mcgovern, A. E. J. Ogilvie, J. P. Sadler, P. Skidmore

Earth Science Faculty Scholarship

Filtration Rates Of The Zebra Mussel (Dreissena Polymorpha) On Natural Seston From Saginaw Bay, Lake Huron, David L. Fanslow, Thomas F. Nalepa, Gregory A. Lang

United States Department of Commerce: Staff Publications

Initial Colonization Of The Zebra Mussel (Dreissena Polymorpha) In Saginaw Bay, Lake Huron: Population Recruitment, Density, And Size Structure, Thomas F. Nalepa, James A. Wojcik, David L. Fanslow, Gregory A. Lang

United States Department of Commerce: Staff Publications

Initial Transgressive Phase Of Leg 144 Guyots: Evidence Of Extreme Sulfate Reduction, Bjørn Buchardt, Mary Anne Holmes

Department of Earth and Atmospheric Sciences: Faculty Publications

Sharing Information Benefits The Meat Industry, Michael Paton

Journal of the Department of Agriculture, Western Australia, Series 4

Nature Conservation In The Western Australian Wheatbelt, Max Abensperg-Traun

Journal of the Department of Agriculture, Western Australia, Series 4