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Articles 1 - 30 of 1491
Full-Text Articles in Physical Sciences and Mathematics
Absorption Efficiencies And Biochemical Fractionation Of Assimilated Compounds In The Cold Water Appendicularian Oikopleura Vanhoeffeni, Alexander B. Bochdansky, Don Deibel, Richard B. Rivkin
Absorption Efficiencies And Biochemical Fractionation Of Assimilated Compounds In The Cold Water Appendicularian Oikopleura Vanhoeffeni, Alexander B. Bochdansky, Don Deibel, Richard B. Rivkin
OES Faculty Publications
Using Ge-68:C-14 dual-labeling, we investigated the absorption efficiency of diatom carbon for the cold water appendicularian Oikopleura vanhoeffeni. The absorption efficiency of bulk carbon (mean = 67%) was not influenced by body size or ingestion rate. For the first time for a pelagic tunicate, food and feces were fractionated into their major biochemical constituents (i.e., low-molecular-weight compounds, lipid, protein, and polysaccharide), allowing calculation of absorption efficiencies for each fraction. Low-molecular-weight compounds and proteins were preferentially absorbed over lipids and polysaccharides. However, predicted C:N ratios of the fecal pellets of O. vanhoeffeni were in the lower range of C:N ratios …
Search For Higgs Bosons Produced In Association With A Vector Boson In Pp̅ Collisions At √S = 1.8 Tev, F. Abe, Kenneth A. Bloom, Collider Detector At Fermilab Collaboration
Search For Higgs Bosons Produced In Association With A Vector Boson In Pp̅ Collisions At √S = 1.8 Tev, F. Abe, Kenneth A. Bloom, Collider Detector At Fermilab Collaboration
Kenneth Bloom Publications
We search for Higgs bosons produced in association with a massive vector boson in 91 ± 7 pb-1 of pp̅ collisions at √s =1.8 TeV recorded by the Collider Detector at Fermilab. We assume the Higgs scalar H0 decays to a bb̅ pair with branching ratio β, and we consider the hadronic decays of the vector boson V (W or Z). Observations are consistent with background expectations. We place 95% confidence level upper limits on σ (pp̅→H0V) β as a function of the scalar mass (MH0) …
Search For The Decays BS0,BD0 → E±Μ± And Pati-Salam Leptoquarks, F. Abe, Kenneth A. Bloom, Collider Detector At Fermilab Collaboration
Search For The Decays BS0,BD0 → E±Μ± And Pati-Salam Leptoquarks, F. Abe, Kenneth A. Bloom, Collider Detector At Fermilab Collaboration
Kenneth Bloom Publications
We have searched for the decays Bs0→ e±μ± and Bd0 → e±μ± using a 102 pb-1 data sample of pp̅ collisions at √s =1.8 TeV collected with the Collider Detector at Fermilab. We set upper limits on the branching fractions of Ɓ(Bs0 → e±μ±) < 6.1(8.2) X 10-6 and Ɓ(Bd0 → e±μ±) < 3.5(4.5) X 10-6 at 90(95)% confidence level. Using these limits, we set lower bounds on the corresponding Pati-Salam leptoquark masses and find that MLQ(B …
An Ab Initio Study Of The Mono- And Difluorides Of Krypton, Gerald J. Hoffman, Laura A. Swafford '97, Robert J. Cave
An Ab Initio Study Of The Mono- And Difluorides Of Krypton, Gerald J. Hoffman, Laura A. Swafford '97, Robert J. Cave
All HMC Faculty Publications and Research
Results from ab initio calculations at the CCSD(T) level of theory are presented for krypton monofluoride (KrF), krypton monofluoride cation (KrF+), linear, ground-state krypton difluoride (KrF2), the triplet state of krypton difluoride, and the krypton–fluorine van der Waals complex (Kr–F2). These are the first calculations demonstrating that KrF is a bound molecule, in agreement with experimental observation. When corrected for basis-set superposition error, the calculated potential displays quantitative agreement with the attractive wall of the experimentally measured potential curve. Results are also presented for KrF+ and linear KrF2 which yield accurate values for their dissociation energies. The triplet state of …
Density Of Zeros On The Lee-Yang Circle Obtained From Magnetization Data Of A Two-Dimensional Ising Ferromagnet, Christian Binek
Density Of Zeros On The Lee-Yang Circle Obtained From Magnetization Data Of A Two-Dimensional Ising Ferromagnet, Christian Binek
Christian Binek Publications
In order to provide experimental access to the statistical theory of Lee and Yang [Phys. Rev. 87, 410 (1952)] the density function g(θ) of zeros on the Lee-Yang circle has been determined for the first time by analyzing isothermal magnetization data m(H) of the Ising ferromagnet FeCl2 in axial magnetic fields H at temperatures 34≤T≤99 K. The validity of our approach is demonstrated by the perfect agreement of magnetic specific heat data as calculated from g(θ) and m(H) via Maxwell's relation. Moreover, the correct in-plane exchange constant of FeCl2 emerges from the …
Gravitational Waves From Collapsing Vacuum Domains, Marcelo Gleiser, Ronald Roberts
Gravitational Waves From Collapsing Vacuum Domains, Marcelo Gleiser, Ronald Roberts
Dartmouth Scholarship
The breaking of an approximate discrete symmetry, the final stages of a first order phase transition, or a postinflationary biased probability distribution for scalar fields are possible cosmological scenarios characterized by the presence of unstable domain wall networks. Combining analytical and numerical techniques, we show that the nonspherical collapse of these domains can be a powerful source of gravitational waves. We compute their contribution to the stochastic background of gravitational radiation and explore their observability by present and future gravitational wave detectors.
Fundamental And Magnetic-Hardening Studies Of Nanocrystalline And Naaocomposite Magnets, David J. Sellmyer, George C. Hadjipanayis
Fundamental And Magnetic-Hardening Studies Of Nanocrystalline And Naaocomposite Magnets, David J. Sellmyer, George C. Hadjipanayis
David Sellmyer Publications
In this project we study new nanocrystalline and nanocomposite structures that have high potential for permanent-magnet development. These materials, which can be synthesized to have either very high or intermediate coercivities, have many applications in electric power, transportation, and information-storage industries. There is great interest in further development of understanding and application of these materials. Following are brief discussions of recent research highlights for the present grant.
Experimental Observation Of Relativistic Nonlinear Thomson Scattering, Szu-Yuan Chen, Anatoly Maksimchuk, Donald Umstadter
Experimental Observation Of Relativistic Nonlinear Thomson Scattering, Szu-Yuan Chen, Anatoly Maksimchuk, Donald Umstadter
Donald Umstadter Publications
Classical Thomson scattering—the scattering of low-intensity light by electrons—is a linear process, in that it does not change the frequency of the radiation; moreover, the magnetic-field component of light is not involved. But if the light intensity is extremely high (~1018 Wcm–2), the electrons oscillate during the scattering process with velocities approaching the speed of light. In this relativistic regime, the effect of the magnetic and electric fields on the electron motion should become comparable, and the effective electron mass will increase. Consequently, electrons in such high fields are predicted to quiver nonlinearly, moving in figure-eight patterns …
Relativistic Nonlinear Optics, Phillip F. Schewe, Ben Stein, Donald P. Umstadter
Relativistic Nonlinear Optics, Phillip F. Schewe, Ben Stein, Donald P. Umstadter
Donald Umstadter Publications
Laser light is a convenient way of transporting both electric and magnetic fields. When an electron encounters light, however, it is usually the electric field that does the talking; the magnetic part of light is less influential since its effect on the electron is proportional to the electron's speed as a fraction of the speed of light (c). In new experiments at the University of Michigan this is all changed since the intensity of the laser light used is so great (a terawatt of power, compared to a milliwatt for a laser in a CD player) that the electrons in …
On The Basic Representation Theorem For Convex Domination Of Measures, J. Elton, Theodore P. Hill
On The Basic Representation Theorem For Convex Domination Of Measures, J. Elton, Theodore P. Hill
Research Scholars in Residence
A direct, constructive proof is given for the basic representation theorem for convex domination of measures. The proof is given in the finitistic case (purely atomic measures with a finite number of atoms), and a simple argument is then given to extend this result to the general case, including both probability measures and finite Borel measures on infinite-dimensional spaces. The infinite-dimensional case follows quickly from the finite-dimensional case with the use of the approximation property.
Events With A Rapidity Gap Between Jets In P̅P Collisions At √S = 630 Gev, F. Abe, Kenneth A. Bloom, Collider Detector At Fermilab Collaboration
Events With A Rapidity Gap Between Jets In P̅P Collisions At √S = 630 Gev, F. Abe, Kenneth A. Bloom, Collider Detector At Fermilab Collaboration
Kenneth Bloom Publications
We report a measurement of the fraction of dijet events with a rapidity gap between jets produced by color-singlet exchange in p̅p collisions at √s =630 GeV at the Fermilab Tevatron. In events with two jets of transverse energy ETjet > 8 GeV, pseudorapidity in the range 1.8 <|ηjet | < 3.5 and η1 η2 < 0, the color-singlet exchange fraction is found to be R=[2.7 ± 0.7(stat) ± 0.6(syst)]%. Comparisons are made with results obtained at √s =1800 GeV and with theoretical expectations.
Steps Toward Determination Of The Size And Structure Of The Broad-Line Region In Active Galactic Nuclei. Xiii. Ultraviolet Observations Of The Broad-Line Radio Galaxy 3c 390.3, Paul T. O'Brien, M. Dietrich, K. Leighly, D. Alloin, J. Clavel, D. Michael Crenshaw, K. Horne, G. A. Criss, Julian Henry Krolik, Matthew A. Malkan, Hagai Netzer, Bradley M. Peterson, G. A. Reichert, P. M. Rodriguez-Pascual, W. Wamsteker, K. S.J. Anderson, N. G. Bochkarev, F.-Z. Cheng, A. V. Filippenko, C. Martin Gaskell, I. M. George, M. R. Goad, L. C. Ho, Shai Kaspi, W. Kollatschny, Kirk T. Korista, G. Macalpine, D. Marlow, P. G. Martin, S. L. Morris, Richard William Pogge, B. C. Qian, M. C. Recondo-Gonzalez, J. M. Rodriguez Espinosa, M. Santos-Lleo, A. I. Shapovalova, J. M. Shull, G. M. Stirpe, W.-H. Sun, T. J. Turner, R. Vio, S. Wagner, I. Wanders, K. A. Wills, H. Wu, S. J. Xue, Z.-L. Zou
Steps Toward Determination Of The Size And Structure Of The Broad-Line Region In Active Galactic Nuclei. Xiii. Ultraviolet Observations Of The Broad-Line Radio Galaxy 3c 390.3, Paul T. O'Brien, M. Dietrich, K. Leighly, D. Alloin, J. Clavel, D. Michael Crenshaw, K. Horne, G. A. Criss, Julian Henry Krolik, Matthew A. Malkan, Hagai Netzer, Bradley M. Peterson, G. A. Reichert, P. M. Rodriguez-Pascual, W. Wamsteker, K. S.J. Anderson, N. G. Bochkarev, F.-Z. Cheng, A. V. Filippenko, C. Martin Gaskell, I. M. George, M. R. Goad, L. C. Ho, Shai Kaspi, W. Kollatschny, Kirk T. Korista, G. Macalpine, D. Marlow, P. G. Martin, S. L. Morris, Richard William Pogge, B. C. Qian, M. C. Recondo-Gonzalez, J. M. Rodriguez Espinosa, M. Santos-Lleo, A. I. Shapovalova, J. M. Shull, G. M. Stirpe, W.-H. Sun, T. J. Turner, R. Vio, S. Wagner, I. Wanders, K. A. Wills, H. Wu, S. J. Xue, Z.-L. Zou
C. Martin Gaskell Publications
As part of an extensive multi-wavelength monitoring campaign, the International Ultraviolet Explorer satellite was used to observe the broad-line radio galaxy 3C 390.3 during the period 1994 December 31-1996 March 5. Spectra were obtained every 6È10 days. The UV continuum varied by a factor of 7 through the campaign, while the broad emission lines varied by factors of 2È5. Unlike previously monitored Seyfert 1 galaxies, in which the X-ray continuum generally varies with a larger amplitude than the UV, in 3C 390.3 the UV continuum light curve is similar in both amplitude and shape to the X-ray light curve observed …
Distribution Of Isolated Volcanoes On The Flanks Of The East Pacific Rise, 15.3°-20°S, Scott M. White, Ken C. Macdonald, Daniel S. Scheirer, Marie-Helene Cormier
Distribution Of Isolated Volcanoes On The Flanks Of The East Pacific Rise, 15.3°-20°S, Scott M. White, Ken C. Macdonald, Daniel S. Scheirer, Marie-Helene Cormier
Faculty Publications
Volcanic constructions, not associated with seamount (or volcano) chains, are abundant on the flanks of the East Pacific Rise (EPR) but are rare along the axial high. The distribution of isolated volcanoes, based on multibeam bathymetric maps, is approximately symmetric about the EPR axis. This symmetry contrasts with the asymmetries in the distribution of volcano chains (more abundant on the west flank), the seafloor subsidence rates (slower on the west flank), and the distribution of plate-motion-parallel gravity lineaments (more prominento nthe west flank). Most of the isolated volcanoes complete their growth within -14 km of the axis on crust younger …
Measurement Of Three-Jet Distributions In Photoproduction At Hera, J. Breitweg, S. Chekanov, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, R. Stanek, R. Yoshida, Margarita C. K. Mattingly, G. Abbiendi, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi
Measurement Of Three-Jet Distributions In Photoproduction At Hera, J. Breitweg, S. Chekanov, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, R. Stanek, R. Yoshida, Margarita C. K. Mattingly, G. Abbiendi, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi
Faculty Publications
The cross section for the photoproduction of events containing three jets with a three-jet invariant mass of M31 > 50 GeV has been measured with the ZEUS detector at HERA. The three-jet angular distributions are inconsistent with a uniform population of the available phase space but are well described by parton shower models and script O sign(α α2s) pQCD calculations. Comparisons with the parton shower model indicate a strong contribution from initial state radiation as well as a sensitivity to the effects of colour coherence. © 1998 Elsevier Science B.V. All rights reserved.
Hey, You Got Your Language In My Operating System!, Jon Howell, Mark Montague
Hey, You Got Your Language In My Operating System!, Jon Howell, Mark Montague
Computer Science Technical Reports
Several projects in the operating systems research community suggest a trend of convergence among features once divided between operating systems and languages. We describe how partial evaluation and transformational programming systems apply to this trend by providing a general framework for application support, from compilation to run-time services. We contend that the community will no longer think of implementing a static collection of services and calling it an operating system; instead, this general framework will allow applications to be flexibly configured, and the ``operating system'' will simply be the application support that is supplied at run-time.
Snowflake: Spanning Administrative Domains, Jon Howell, David Kotz
Snowflake: Spanning Administrative Domains, Jon Howell, David Kotz
Computer Science Technical Reports
Many distributed systems provide a ``single-system image'' to their users, so the user has the illusion that they are using a single system when in fact they are using many distributed resources. It is a powerful abstraction that helps users to manage the complexity of using distributed resources. The goal of the Snowflake project is to discover how single-system images can be made to span administrative domains. Our current prototype organizes resources in namespaces and distributes them using Java Remote Method Invocation. Challenging issues include how much flexibility should be built into the namespace interface, and how transparent the network …
Static-Electric-Field-Induced, High-Energy Plateau For Scattered X-Ray Photons In Laser-Assisted, X-Ray–Atom Scattering, Dejan B. Miloševic, Anthony F. Starace
Static-Electric-Field-Induced, High-Energy Plateau For Scattered X-Ray Photons In Laser-Assisted, X-Ray–Atom Scattering, Dejan B. Miloševic, Anthony F. Starace
Anthony F. Starace Publications
We consider scattering of x rays by H atoms in the presence of both a linearly polarized laser field and a static electric field. Results for the differential cross section as a function of the number of photons n exchanged with the laser field are presented. For x-ray–atom scattering in the presence of a 1014 W/cm2 laser field the differential cross section has a plateau only for emitted photons (n<0). Adding a static electric field gives rise to an extended plateau for absorbed photons (n>0), indicating a substantial increase of the scattered x-ray energies. We present a quasiclassical explanation of these results.
Magnetic Microstructure Of Magnetotactic Bacteria By Electron Holography, Rafal E. Dunin-Borkowski, Martha R. Mccartney, Richard B. Frankel, Dennis A. Bazylinski, Mihály Pósfai, Peter R. Buseck
Magnetic Microstructure Of Magnetotactic Bacteria By Electron Holography, Rafal E. Dunin-Borkowski, Martha R. Mccartney, Richard B. Frankel, Dennis A. Bazylinski, Mihály Pósfai, Peter R. Buseck
Physics
Off-axis electron holography in the transmission electron microscope was used to correlate the physical and magnetic microstructure of magnetite nanocrystals in magnetotactic bacteria. The magnetite crystals were all single magnetic domains, and the magnetization directions of small superparamagnetic crystals were constrained by magnetic interactions with larger crystals in the chains. Shape anisotropy was found to dominate magnetocrystalline anisotropy in elongated crystals. A coercive field between 300 and 450 oersted was determined for one chain.
22. Yu Tongyin, Otto Vogl, Shukuan Fu
22. Yu Tongyin, Otto Vogl, Shukuan Fu
Emeritus Faculty Author Gallery
No abstract provided.
International Symposium On Ionic Polymerization Ip'97, Otto Vogl, Przemyslaw Kubisa
International Symposium On Ionic Polymerization Ip'97, Otto Vogl, Przemyslaw Kubisa
Emeritus Faculty Author Gallery
No abstract provided.
The Prairie Naturalist Volume 30, No.4 December 1998
The Prairie Naturalist Volume 30, No.4 December 1998
The Prairie Naturalist
FISH COMMUNITY AND WATER QUALITY CHANGES IN THE BIG SIOUX RIVER ▪ D. Dieterman, and C. R. Berry, Jr.
EFFECTS OF PARASITOIDS AND COMPETITION ON CLUTCH SIZE OF A GALLING MIDGE ▪ D. J. Kinateder and S. J. Stein
RESPONSE OF BREEDING SEASON BLUE-WINGED TEAL TO DECOY TRAPPING ▪ P. R. Garrettson
COMPARISON OF POINT-COUNT AND WADE-FLUSH METHODS FOR COUNTING DUCKS ▪ G. M. Linz, C. P McMurl, H. J. Homan, and D. L. Bergman
Reviewers 1998
Author Index - Volume 30
Subject Index - Volume 30
Announcements
Factors Affecting The Movements Of Rainbow Trout (Oncorhynchus Mykiss) In Lake Ogallala, Nebraska, Tadd M. Barrow
Factors Affecting The Movements Of Rainbow Trout (Oncorhynchus Mykiss) In Lake Ogallala, Nebraska, Tadd M. Barrow
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.
Water Current, Volume 30, No. 6, December 1998
Water Current, Volume 30, No. 6, December 1998
Water Current Newsletter
Additional Research Shows Promise for Buffer Strips
From the Director: Testing Your Drinking Water; Drinking Water Tabloid Suggestions; USGS RFPs
Planning Nebraska's Water Future
Where Do You Get Your Water From?
Recycling Program Collects 49 Tons of Plastic
Lingle Earns Extension Wildlife Award
Laundry Disk ClaimsDon't Hold Water
Seminars Spotlight Latest in Water Research
Nation's Water Use Down, USGS Says
Water News Briefs
Agronomy Society Lauds Website
Free Wetlands Tabloid
Franti Earns Research Award
Looking for Ideas
Ben Nelson Service Award
Great Plains Research Articles
Assessing the Impact of Waste Lagoons on Groundwater
Fan-Type Conditions For Collapsible Graphs, Zhi-Hong Chen
Fan-Type Conditions For Collapsible Graphs, Zhi-Hong Chen
Scholarship and Professional Work - LAS
No abstract provided.
Observations On Groundwater Recharge In The Westdale Catchment, M F. Lewis, C E. Mcconnell
Observations On Groundwater Recharge In The Westdale Catchment, M F. Lewis, C E. Mcconnell
Resource management technical reports
A study of the role of groundwater carriers and barriers in controlling salinity was carried out in the Westdale Catchment by Lewis and McConnell (in preparation). Although that study was primarily concerned with groundwater flow and discharge processes, the data collected also provided rudimentary information on the timing of groundwater recharge events and their distribution across the landscape.
Management Plan For Sustainable Tourism At The Houtman Abrolhos Islands, Le Provost Dames & Moore
Management Plan For Sustainable Tourism At The Houtman Abrolhos Islands, Le Provost Dames & Moore
Fisheries management papers
The combination of unique species of fish, coral reefs and other invertebrates, historical shipwrecks and the commercially valuable Western rock lobster makes the Abrolhos a unique area of Western Australia. In recognition of this the Minister of Fisheries is releasing the plan 'Management of Houtman Abrolhos System', following a period of public consultation. The islands are becoming increasingly popular destination for tourists that are attracted to the diving, fishing, bird watching, maritime history and other features of the Abrolhos. The draft Management Plan for Sustainable Tourism in the Houtman Abolhos Islands has been developed to provide a framework within which …
Future Directions For Tourism At The Houtman Abrolhos Islands - Draft For Public Comment, Le Provost Dames & Moore
Future Directions For Tourism At The Houtman Abrolhos Islands - Draft For Public Comment, Le Provost Dames & Moore
Fisheries management papers
This paper discusses the constraints on tourism in the Abrolhos and key management strategies of the draft tourism plan. Discusses facilities required and recommending a broadening of air services to allow their use for tourism, establishment of boat moorings for commercial tourist operators, public moorings may be installed and rented for use by private boats, upgrading of facilites Dransfield House on Beacon Island, could be used as an interpretive centre.
Future Directions For The Rock Lobster Industry Advisory Committee And The Western Rock Lobster Managed Fishery, Kevin Donohue
Future Directions For The Rock Lobster Industry Advisory Committee And The Western Rock Lobster Managed Fishery, Kevin Donohue
Fisheries management papers
This paper is divided into two parts. The purpose of Part One is to get Industry's views on the six key questions concerning the Rock Lobster Industry Advisory Committee's role, operation and advice. The purpose of Part Two is to present those management issues identified at the joint RLIAC/Western Rock Lobster Development Association workshop held on the 16 September 1998.
Management Of The Houtman Abrohlos System., Kim Nardi, Abrohlos Islands Management Advisory Committee
Management Of The Houtman Abrohlos System., Kim Nardi, Abrohlos Islands Management Advisory Committee
Fisheries management papers
The Abrolhos System is the Houtman Abrolhos Islands and adjoing State Territorial Waters. It is an important part of the Western Australian environment. Has major significance in conservation of flora and fauna and also in geological terms. The waters adjoining State Territorial Waters contain some of the most highly valued marine systems in the State. These include sites of historical shipwrecks in Australia. The are of great interest to visitors and support a relatively small but growing recreation and tourism industy. The area is integral to the Western rock lobster fishery, which is that State's premier primary industries. The Abrolhos …
Pastoral Resources And Their Management In The Sandstone-Yalgoo-Paynes Find Area, Western Australia, A M E Van Vreeswyk, P. T. Godden
Pastoral Resources And Their Management In The Sandstone-Yalgoo-Paynes Find Area, Western Australia, A M E Van Vreeswyk, P. T. Godden
Agriculture reports
This report covers about 94,700 square kilometres of rangelands in the Sandstone-Yalgoo-Paynes Find area of Western Australia. The area lies within 27°S and 30°S latitudes, and 115°30'E and 120°E longitudes and includes the towns of Sandstone, Yalgoo and Paynes Find. The northern, southern, and eastern limits of the survey area are largely defined by the boundaries of the 1:250,000 scale series map sheets.The western limit is the boundary between the pastoral and agricultural area.