Physical Sciences and Mathematics Commons^™

Solubilizing Single Walled Carbon Nanotubes By Direct Reaction With Amines And Alkylaryl Amines, Robert C. Haddon, Jian Chen

Chemistry Faculty Patents

Naked single-walled nanotube carbon metals and semiconductors are dissolved in organic solutions by direct functionalization with amines or alkylaryl amines having an uninterrupted carbon chain of at least 5 and more preferably 9 carbon atoms in length.

Lengths Of Systoles On Tileable Hyperbolic Surfaces, Kevin Woods

Mathematical Sciences Technical Reports (MSTR)

The same triangle may tile geometrically distinct surfaces of the same genus, and these tilings may determine isomorphic tiling groups. We determine if there are geometric differences in the surfaces that can be found using group theoretic methods. Specifically, we determine if the systole, the shortest closed geodesic on a surface, can distinguish a certain families of tilings. For example, there are three tilings of surfaces of genus 14 by the hyperbolic triangle with angles π/2 , π/3 , and π/7 whose tiling groups are all PSL₂(13). These tilings can be distinguished by the lengths of their systoles.

In-Cave Dye Tracing And Drainage Basin Divides In The Mammoth Cave Karst Aquifer, Kentucky, Chris Groves, Joe Meiman, Shannon Herstein

Chris Groves

Karst ground-water basin divides are generally depicted as two-dimensional lines on maps, but they are better considered as three-dimensional surfaces within the subsurface. Dye traces are necessary to map out these surfaces and to locate conduits inaccessible to cave surveyors, and are indispensable for understanding the geometry of the complex networks of flow paths through the aquifer. A key reason why the Mammoth Cave System is the world's longest known cave is that its passages extend over several major ground-water basins. The divides between these basins define the drainage system geometry and precise location of them is critical for understanding …

In-Cave Dye Tracing And Drainage Basin Divides In The Mammoth Cave Karst Aquifer, Kentucky, Chris Groves, Joe Meiman, Shannon Herstein

Earth, Environmental, and Atmospheric Sciences Faculty Publications

Karst ground-water basin divides are generally depicted as two-dimensional lines on maps, but they are better considered as three-dimensional surfaces within the subsurface. Dye traces are necessary to map out these surfaces and to locate conduits inaccessible to cave surveyors, and are indispensable for understanding the geometry of the complex networks of flow paths through the aquifer. A key reason why the Mammoth Cave System is the world's longest known cave is that its passages extend over several major ground-water basins. The divides between these basins define the drainage system geometry and precise location of them is critical for understanding …

Locating Nests Of Birds In Grasslands From A Mobile Tower Blind, Thomas F. Fondell, Steven T. Hoekman, I. J. Ball

United States Geological Survey: Staff Publications

Locating nests of grassland passerines can be difficult, labor intensive, and disruptive to birds and vegetation. We developed a mobile tower blind for observing adult bird behavior and used it to locate nests in a western Montana grassland. We compared nest-search efficiency of behavioral observations from the tower versus the ground. Nests of savannah sparrow (Passerculus samhvichensis) were found in a higher proportion of territories searched from the tower (13/16 = 82%) than from the ground (4113 = 3 1%). Average search time for each nest found was lower from the tower (44 min) than from the ground …

Search For Large Extra Dimensions In Dielectron And Diphoton Production, B. Abbott, Gregory R. Snow, D0 Collaboration

Gregory Snow Publications

We report a search for effects of large extra spatial dimensions in pp̅ collisions at a center-of-mass energy of 1.8 TeV with the D0 detector, using events containing a pair of electrons or photons. The data are in good agreement with the expected background and do not exhibit evidence for large extra dimensions. We set the most restrictive lower limits to date, at the 95% C.L. on the effective Planck scale between 1.0 and 1.4 TeV for several formalisms and numbers of extra dimensions.

Incoherent Beam Combining Using Stimulated Brillouin Scattering In Multimode Fibers, Timothy H. Russell, Won B. Roh, John R. Marciante

Faculty Publications

A beam combining technique for producing a single, spatially coherent beam from two mutually incoherent (temporally and spatially) lasers is demonstrated and the spatial coherence properties of the resulting beam are characterized. The technique is based on simultaneous excitation of stimulated Brillouin scattering by two independent lasers operating at two different wavelengths in a long multimode optical fiber. Though spectrally independent, the resulting Stokes beams produce essentially identical intensity distributions corresponding to the fundamental fiber mode. Abstract © 2001 Optical Society of America.

Dealing With Nuisance And Depredating Black Bears, Gary W. Witmer, Donald G. Whittaker

United States Department of Agriculture Wildlife Services: Staff Publications

Black bears (Ursus americanus) are a valued resource in North America but pose many challenges to resource managers. They may be managed in 1 or more ways, including sustained yield harvests, nuisance animal control, or conservation management. Many black bear populations are stable or increasing, and combine with expanding human populations, increased development, and recreational activities, are leading to an increase in human-bear conflicts. Historically, methods such as relocation, general hunting seasons, or special hunts have been used in an effort to reduce bear density and damage, or to target individual offending animals. Many resource managers now operate …

Refined Kinematics Of The Eastern California Shear Zone From Gps Observations, 1993-1998, M. Meghan Miller, Timothy H. Dixon, Roy K. Dokka

All Faculty Scholarship for the College of the Sciences

Global Positioning System (GPS) results from networks spanning the Eastern California shear zone and adjacent Sierra Nevada block, occupied annually between 1993 and 1998, constrain plate margin kinematics. We use an elastic block model to relate GPS station velocities to long‐term fault slip rate estimates. The model accounts for elastic strain accumulation on the San Andreas fault, as well as faults of the Eastern California shear zone. South of the Garlock fault, 14 mm/yr of dextral shear is distributed across the Eastern California shear zone. Some of this slip penetrates eastward into the Basin and Range, and a collective budget …

Stereoselective One-Pot Synthesis Of Vinylsilanes From Aromatic Aldehydes, Man Lung Kwan, Chiu Yeung, Kerry Breno, Kenneth Doxsee

Man Lung Desmond Kwan

Vinylsilanes serve as convenient vinyl anion equivalents, but procedures for their stereoselective synthesis from aldehydes are scarce. A variety of aromatic aldehydes are converted to the corresponding vinylsilanes in a one-pot procedure involving the addition of (trimethylsilylmethyl)lithium to the aldehyde followed by treatment with Cp2TiCH2·AlMe2Cl (‘Tebbe's reagent’). Halide and alkoxide substituents are tolerated, and (E)-vinylsilanes are formed exclusively in good yield.

Transition From Data To Information, Jens G. Pohl

Collaborative Agent Design (CAD) Research Center

It is often lamented that we human beings are suffering from an information overload. This is a myth; as shown in Fig.1, there is no information overload. Instead, we are suffering from a data overload. The confusion between data and information is not readily apparent and requires further explanation. Unorganized data are voluminous but of very little value. Over the past 15 years, industry and commerce have made significant efforts to rearrange this unorganized data into purposeful data, utilizing various kinds of database management systems. However, even in this organized form, we are still dealing with data and not …

Effect Of Carrier-Gas Pressure On Barrier To Nucleation: Monte Carlo Simulation Of Water/Nitrogen System, K.J. Oh, Xiao Cheng Zeng

Xiao Cheng Zeng Publications

Carrier gases are used in most nucleation experiments for releasing the latent heat generated during vapor condensation. In the analysis of experimental data it is often assumed that the carrier gas is inert and would not participate in the nucleation process of the target gas. Several recent nucleation experiments show that the influence of carrier gases to nucleation rate is not negligible under certain conditions. To gain more insight into the carrier-gas effect, we carry out Monte Carlo simulation to compute the free energy of formation of water clusters in the presence of a nitrogen carrier gas. At fixed temperature …

Gap Filling Strategies For Long Term Energy Flux Data Sets, Eva Falge, Dennis D. Baldocchi, Richard Olson, Peter Anthoni, Marc Aubinet, Christian Bernhofer, George Burba, Reinhart Ceulemans, Robert Clement, Han Dolman, Andre Granier, Patrick Gross, Thomas Grunwald, David Hollinger, Niels-Otto Jensen, Gabriel Katul, Petri Keronen, Andrew Kowalski, Chun Ta Lai, Beverly E. Law, Tilden Meyers, John Moncrieff, Eddy Moors, J. William Munger, Kim Pilegaard, Ullar Rannik, Corinna Rebmann, Andrew E. Suyker, John Tenhunen, Kevin Tu, Shashi Verma, Timo Vesala, Kell Wilson, Steve Wofsy

School of Natural Resources: Faculty Publications

At present a network of over 100 field sites are measuring carbon dioxide, water vapor and sensible heat fluxes between the biosphere and atmosphere, on a nearly continuous basis. Gaps in the long term measurements of evaporation and sensible heat flux must be filled before these data can be used for hydrological and meteorological applications. We adapted methods of gap filling for NEE (net ecosystem exchange of carbon) to energy fluxes and applied them to data sets available from the EUROFLUX and AmeriFlux eddy covariance databases. The average data coverage for the sites selected was 69% and 75% for latent …

Gap Filling Strategies For Defensible Annual Sums Of Net Ecosystem Exchange, Eva Falge, Dennis D. Baldocchi, Richard Olson, Peter Anthoni, Marc Aubinet, Christian Bernhofer, George Burba, Reinhart Ceulemans, Robert Clement, Han Dolman, Andre Grainer, Thomas Grunwald, David Hollinger, Niels-Otto Jensen, Gabriel Katul, Petri Keronen, Andrew Kowalski, Chun Ta Lai, Beverly E. Law, Tilden Meyers, Jon Moncrieff, Eddy Moors, J. William Munger, Kim Pilegaard, Ullar Rannik, Corinna Rebmann, Andrew E. Suyker, John Tenhunen, Kevin Tu, Shashi Verma, Timo Vesala, Kell Wilson, Steve Wofsy

School of Natural Resources: Faculty Publications

Heightened awareness of global change issues within both science and political communities has increased interest in using the global network of eddy covariance flux towers to more fully understand the impacts of natural and anthropogenic phenomena on the global carbon balance. Comparisons of net ecosystem exchange (F_NEE) responses are being made among biome types, phenology patterns, and stress conditions. The comparisons are usually performed on annual sums of F_NEE; however, the average data coverage during a year is only 65%. Therefore, robust and consistent gap filling methods are required.

We review several methods of gap …

Tropical Climate Changes At Millennial And Orbital Timescales On The Bolivian Altiplano, Paul A. Baker, Catherine A. Rigsby, Geoffrey O. Seltzer, Sherilyn C. Fritz, Tim K. Lowenstein, Niklas P. Bacher, Carlos Veliz

Department of Earth and Atmospheric Sciences: Faculty Publications

Tropical South America is one of the three main centers of the global, zonal overturning circulation of the equatorial atmosphere (generally termed the “Walker” circulation). Although this area plays a key role in global climate cycles, little is known about South American climate history. Here we describe sediment cores and down-hole logging results of deep drilling in the Salar de Uyuni, on the Bolivian Altiplano, located in the tropical Andes. We demonstrate that during the past 50,000 years the Altiplano underwent important changes in effective moisture at both orbital (20,000-year) and millennial timescales. Long-duration wet periods, such as the Last …

A Determination Of The Local Density Of White Dwarf Stars, J. B. Holberg, Terry D. Oswalt, E. M. Sion

Publications

The most recent version of the Catalog of Spectroscopically Identified White Dwarfs lists 2249 white dwarf stars. Among these stars are 109 white dwarfs that have either reliable trigonometric parallaxes or color-based distance moduli that place them at a distance within 20 pc of the Sun. Most of these nearby white dwarfs are isolated stars, but 28 (25% of the sample) are in binary systems, including such well-known systems as Sirius A/B and Procyon A/B. There are also three double degenerate systems in this sample of the local white dwarf population. The sample of local white dwarfs is largely complete …

High Resolution Charged Particle-Energy Detecting, Multiple Sequential Stage, Compact, Small Diameter, Retractable Cylindrical Mirror Analyzer System, And Method Of Use, Peter A. Dowben, Carlo Waldfried, Tara J. Mcavoy, David N. Mcilroy

Peter Dowben Publications

Disclosed is a compact, small diameter, high resolution charged particle-energy detecting, retractable cylindrical mirror analyzer system. Multiple sequential stages enable charged particle-energy detection with an improved resolution as compared to that possible where only a single stage is utilized. The relatively small size allows for positioning, via a manipulator of the cylindrical mirror analyzer system, which is attached to a linear motion feedthrough mounted on a conflat flange of a vacuum system.

Ua12/2/1 College Heights Herald, Vol. 76, No. 35, Wku Student Affairs

WKU Archives Records

WKU campus newspaper reporting campus, athletic and Bowling Green, Kentucky news. Articles in this issue:

• Walsh, Erica. Chris Groves Recovering After Dramatic Cave Rescue – Sides Cave
• Lynch, Caroline. Night-long Rescue Effort Has Happy Ending – Chris Groves
• Youngman, Sam. Students Helping Bowling Green Economic Boom
• Pre-Law Club Hosting Panel
• New Support Group Forming – Eating Disorders
• Hall, Rex. New Traffic Signal Delayed – University Boulevard
• Ragan, Jason. Engineering Program A Step Closer
• Student Government Association Will Benefit from Online Voting
• Grady, Brian. Editorial Cartoon re: Virtual Voting
• Kreitzer, Debbie. Opinion Page an Instrument of Gossip
• Van der Meer, Wieb. …

Spectral Equivalence Of Bosons And Fermions In One-Dimensional Harmonic Potentials, Michael Crescimanno, Adam S. Landsberg

WM Keck Science Faculty Papers

Recently, Schmidt and Schnack [Physica A 260, 479 (1998)], following earlier references, reiterate that the specific heat of N noninteracting bosons in a one-dimensional harmonic well equals that of N noninteracting fermions in the same potential. We show that this peculiar relationship between heat capacities results from a more dramatic equivalence between Bose and Fermi systems. Namely, we prove that the excitations of such Bose and Fermi systems are spectrally equivalent. Two complementary proofs of this equivalence are provided; one based on a combinatoric argument, the other from analysis of the underlying dynamical symmetry group.

Self-Assembled Fe Nanowires Using Organometallic Chemical Vapor Deposition And Caf2 Masks On Stepped Si(111), J.-L. Lin, D.Y. Petrovykh, A. Kirakosian, H. Rauscher, F.J. Himpsel, Peter A. Dowben

Peter Dowben Publications

Linear arrays of 3 nm wide Fe stripes with 15 nm spacing are fabricated by self-assembly. They are formed by photolysis of ferrocene that is selectively adsorbed between CaF₂ stripes. An ultraviolet nitrogen laser removes the organic ligands from ferrocene. Arrays of CaF₂ stripes serve as masks, which are self-assembled on a stepped Si(111) surface. Scanning tunneling microscopy is used to investigate the surface morphology during growth. A generalization of this method to other wire materials is discussed.

Park Place Wet Pond Monitoring Project 1994–2000 Summary Report, Robin A. Matthews, Mark R. Saunders, Michael Hilles, Joan Vandersypen

Lake Whatcom Other Reports

The Park Place monitoring program is an on-going study of the effectiveness of storm water treatment in a small wet pond located in the northwestern portion of the Lake Whatcom watershed. Water quality in the Lake Whatcom watershed has been monitored since the 1960’s by researchers at Western Washington University. During this time it has been noted that the some of the streams and storm drains entering the lake contained contaminants associated with residential development. In 1990, a comprehensive storm water runoff monitoring project was undertaken by the Institute for Watershed Studies (IWS) at Western Washington University on behalf of …

Adsorption And Decomposition Of Nickelocene On Ag(100): A High-Resolution Electron Energy Loss Spectroscopy And Temperature Programmed Desorption Study, D. L. Pugmire, C. M. Woodbridge, N. M. Boag, Marjorie Langell

Marjorie A. Langell Publications

Nickelocene adsorption and decomposition on the Ag(100) surface were studied with temperature programmed desorption and high resolution electron energy loss spectroscopy. At monolayer coverages on the relatively inert Ag(100) surface at 175 K, nickelocene physisorbs molecularly, with its molecular axis perpendicular to the surface plane. Nickelocene begins decomposing to adsorbed cyclopentadienyl and nickel at 225 K. Molecular desorption is only observed from multilayer material, at 210 K, or from the first monolayer if adjacent surface sites for decomposition are not available. The cyclopentadienyl decomposes through disproportionation to cyclopentadiene, which desorbs, and adsorbed nickel and carbon fragments on the Ag(100) surface …

Water Current, Volume 33, No. 1. February 2001.

Water Current Newsletter

• Researchers Pool Talents To Protect Nebraska’s Premier Trout Fishing Locale by Steve Ress

• From the Director

• Meet the Faculty

• LB699 As A Sales Tax For Natural Resources Programs by Dean E. Edson

• 30th Annual Water Conference Will be Groundwater Quality Monitoring Workshop

• Water News Briefs

From Rs-232 To Object Request Brokers: Incremental Object-Oriented Networking Projects, David S. Janzen

Computer Science and Software Engineering

Selecting an appropriate set of laboratory experiences and projects for a Data Communications and Computer Networks course can be difficult due to the broad and deep nature of the topics. Emphasis may be placed on many networking aspects including design, evaluation, efficiency, security, protocols, tools, and applications. This paper presents a set of projects that attempt to integrate software engineering and systems administration topics. The projects emphasize network application programming. Particular attention will be given to a sequence of incremental projects using an object-oriented approach including the use of the Unified Modeling Language (UML) and a design pattern.

Tb178: Methods For Evaluating Carbon Fractions In Forest Soils: A Review, Jennifer L. Evans, Ivan J. Fernandez, Lindsey E. Rustad, Stephen A. Norton

Technical Bulletins

This publication was developed as part of an effort to evaluate the existing methodologies for determining carbon fractions in soils that might be applied to the question of forest soil C sequestration. A great deal of research has been done on this topic although often focused on agronomic soils. Forest land managers will be increasingly interested in identifying methods to monitor and to evaluate the effects of forest practices on soil C reserves. As well researchers are interested in this and the logical linkages to N cycling. Ultimately practical methods that can be widely utilized will be needed; these may …

Measuring G With A Joystick Pendulum, Thomas J. Bensky

Physics

A method for experimentally measuring g, the Earth's gravitational acceleration, is presented. This method uses a computer joystick and computer as the primary measuring device. If a computer is available, it costs almost nothing to implement, and can be adapted for use as a high school or undergraduate lab exercise, or as a lecture demonstration.

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 17, Number 5, February 2001, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

An eight page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

Effect Of Chemical Sputtering On The Growth And Structural Evolution Of Magnetron Sputtered Cnx Thin Films, Niklas Hellgren, Mats P.J Jõesaar, Esteban Broitman, Per Sandström, Lars Hultman, Jan-Eric Sundgren

Educator Scholarship & Departmental Newsletters

The growth and microstructure evolution of carbon nitride CN_x (0≤x≤0.35) films, deposited by reactive d.c. magnetron sputtering in Ar/N₂ discharges has been studied. The substrate temperature T_S varied between 100 and 550°C, and the N₂ fraction in the discharge gas varied from 0 to 100%. It is found that the deposition rate and film morphology show strong dependence on T_S and nitrogen fraction. For growth temperature of 100°C, the films are amorphous, and essentially unaffected by the nitrogen fraction. For T_S>200°C, however, the nitrogen fraction has more significant effect on the growth and …

Sustainable Tourism Plan For The Houtman Abrolhos Islands, Fisheries Western Australia

Fisheries management papers

The Abrolhos coral reefs are the southernmost living reefs in the Indian Ocean. They have a unique assemblage of tropical species of fish, reef corals and other invertebrates, which live in close association with temperate species, particularly of algae, and species endemic to Western Australia. The Abrolhos is the centre of the fishery for the commercially valuable western rock lobster (Panulirus cygnus). Terrestrial flora and fauna of the Abrolhos are relict and provide important reference areas on ecological interactions. Virtually all the islands of the Abrolhos archipelago have sea bird nesting and breeding areas, and populations of some species of …

Profitable Canola Production In The Great Southern And Lakes District, Paul Carmody, Ashley Herbert

Bulletins 4000 -

The Canola industry has rapidly grown with a 10 fold increase in area sown in Western Australia over the four years from 1996-99.

The driving force behind this increase in area can be attributed to the successful adoption of weed control technology in Triazine Tolerant Canola.

By knowing the model of the limiting factors, which are usually; weed control, fertiliser practices, blackleg management, variety selection, seeding dates, seeding depths, insect control and swathing, we can make the right decisions and achieve the targeted profit.

To produce yield to potential, all factors need to be optimised, otherwise yields will be decreased …