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1987

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Articles 1 - 30 of 1363

Full-Text Articles in Physical Sciences and Mathematics

State-Selective Studies Of T→R, V Energy Transfer: The H+Co System, G. K. Chawla, George C. Mcbane, P. L. Houston, G. C. Schatz Dec 1987

State-Selective Studies Of T→R, V Energy Transfer: The H+Co System, G. K. Chawla, George C. Mcbane, P. L. Houston, G. C. Schatz

Peer Reviewed Articles

Collisional energy transfer from H atoms to CO(v=0, J≈2) has been studied at a collision energy of 1.58±0.07 eV by photolyzing H2S at 222 nm in a nozzle expansion with CO and probing the CO(v", J") levels using tunable VUV laser-induced fluorescence. The ratio CO(v"=1)/CO(v"=0) is found to be 0.1±0.008. The rotational distribution of CO(v"=0) peaks at J"gradually; population is still observed at J">45. The rotational distribution of CO(v"=1) is broad and peaks near J"=20. The ...


Self-Alignments In Words And Their Applications, Alberto Apostolico, Wojciech Szpankowski Dec 1987

Self-Alignments In Words And Their Applications, Alberto Apostolico, Wojciech Szpankowski

Department of Computer Science Technical Reports

No abstract provided.


Architecture And Operation Invocation In The Clouds Kernel, Eugene H. Spafford Dec 1987

Architecture And Operation Invocation In The Clouds Kernel, Eugene H. Spafford

Department of Computer Science Technical Reports

No abstract provided.


Evidence For Weak Link And Anisotropy Limitations On The Transport Critical Current In Bulk Polycrystalline Y1Ba2Cu3O Χ , J.W. Ekin, A.I. Braginski, A.J. Panson, M.A. Janocko, D.W. Capone Ii, N.J. Zaluzec, B. Flandermeyer, O.F. De Lima, M. Hong, J. Kwo, Sy_Hwang Liou Dec 1987

Evidence For Weak Link And Anisotropy Limitations On The Transport Critical Current In Bulk Polycrystalline Y1Ba2Cu3O Χ , J.W. Ekin, A.I. Braginski, A.J. Panson, M.A. Janocko, D.W. Capone Ii, N.J. Zaluzec, B. Flandermeyer, O.F. De Lima, M. Hong, J. Kwo, Sy_Hwang Liou

Si-Hwang Liou Publications

Measurements of the transport critical-current density (Jc), magnetization Jc, and magnetoresistance in a number of bulk sintered samples of Y1Ba2Cu3O χ from several different laboratories indicate that the transport Jc is limited by weak-link regions between high Jc regions. The weak-link Jc has a Josephson character, decreasing by two orders of magnitude as the magnetic field is increased from 0.1 to 10 mT at 77 K. An examination of the grain-boundary region in Y1Ba2Cu3O χ shows no observable impurities or second phases ...


Theory Of The Observations Made Of High-Order Rainbows From A Single Water Droplet, James A. Lock Dec 1987

Theory Of The Observations Made Of High-Order Rainbows From A Single Water Droplet, James A. Lock

Physics Faculty Publications

Over a dozen rainbows have been observed in a single water droplet. They appear as glare spots on the water droplet which take on coloration at the appropriate rainbow angles. The appearance of rainbows as colored glare spots in this situation is understood in terms of the caustics created in the vicinity of the droplet by the refracting light rays. The angular positions of the glare spots are understood in terms of the Fourier transform of the geometric scattering amplitude. The rainbow glare spots are also found to appear numerically in the Fourier transform of the Mie scattered fields. An ...


Oyster Spatfall In Virginia Rivers: 1987 Annual Summary, James Whitcomb Dec 1987

Oyster Spatfall In Virginia Rivers: 1987 Annual Summary, James Whitcomb

Reports

The Virginia Institute of Marine Science (VIMS) conducts weekly surveys from June through early October to obtain oyster spatfall information. Spat counts are made on oyster shells strung on wire and suspended from stakes on public and private beds. The number of spat on shells is counted each week of the spawning season to determine the potential of a particular area for receiving a strike and to predict the most likely period the strikes will occur.


Towards Implementing Robust Geometric Computations, Christoph M. Hoffmann, John E. Hopcroft, Michael S. Karasick Dec 1987

Towards Implementing Robust Geometric Computations, Christoph M. Hoffmann, John E. Hopcroft, Michael S. Karasick

Department of Computer Science Technical Reports

No abstract provided.


Some Efficient Computational Algorithms Related To Phase Models, Vernon J. Rego Dec 1987

Some Efficient Computational Algorithms Related To Phase Models, Vernon J. Rego

Department of Computer Science Technical Reports

No abstract provided.


A Robust Distributed Termination Detection Algorithm, Niraj K. Sharma, Bharat Bhargava Dec 1987

A Robust Distributed Termination Detection Algorithm, Niraj K. Sharma, Bharat Bhargava

Department of Computer Science Technical Reports

No abstract provided.


A System For Experimentation In Replicated Copy Control, Bharat Bhargava, Paul Noll, Andrew Royappa, Donna Sabo Dec 1987

A System For Experimentation In Replicated Copy Control, Bharat Bhargava, Paul Noll, Andrew Royappa, Donna Sabo

Department of Computer Science Technical Reports

No abstract provided.


“Macromolecules 86": An International Conference On Functional Polymers And Biopolymers, Otto Vogl, Geoffrey C. Eastmond Dec 1987

“Macromolecules 86": An International Conference On Functional Polymers And Biopolymers, Otto Vogl, Geoffrey C. Eastmond

Emeritus Faculty Author Gallery

No abstract provided.


Optimum Problem Involving Integral Equations, Innocent H. Twagiramungu Dec 1987

Optimum Problem Involving Integral Equations, Innocent H. Twagiramungu

ETD Collection for AUC Robert W. Woodruff Library

Extremum problem involving certain linear integral equations with linear constraints is considered. We first give a discussion of integral equation with emphasis on the resolvent. Then, we use the resolvent method to convert an extremum problem involving a state and control into one where only the control appears. In the form involving just the controls, the optimal controls are easy to characterize.


A Moment's Eigenvalue Quantization For Difference Equation Models, Jian Qun Pei Dec 1987

A Moment's Eigenvalue Quantization For Difference Equation Models, Jian Qun Pei

ETD Collection for AUC Robert W. Woodruff Library

Finite difference equations abound in all areas of physics and engineering. In particular, linear difference equation eigenvalue problems define an important class of systems which have been studied through various traditional approaches adapted from continuum space methods. We studied an important subclass of problems involving strong coupling potential interactions which are not amenable to conventional analysis, such as ordinary perturbation theory. We worked with a powerful eigenvalue moment method, developed by Handy et al (C.R. Handy, D. Bessis and T. Morley, Atlanta University preprint, 1987), for generating rapidly converging lower and upper bounds to the eigenvalues of such systems ...


Comment On ‘‘Relations Between Microscopic And Macroscopic Lowest-Order Optical Nonlinearities Of Molecular Crystals With One- Or Two-Dimensional Units’’, K.M. White, Craig J. Eckhardt Dec 1987

Comment On ‘‘Relations Between Microscopic And Macroscopic Lowest-Order Optical Nonlinearities Of Molecular Crystals With One- Or Two-Dimensional Units’’, K.M. White, Craig J. Eckhardt

Craig J. Eckhardt Publications

An algebraic error in an earlier paper [J. Zyss and J. L. Oudar, Phys. Rev. A 26, 2028 (1982)] led to an interpretation regarding the desirable polarizability characteristics of a molecule for second-harmonic generation in crystals which is opposite to that actually desired. Optimum response is obtained from crystals comprised of molecules with significant in-plane polarizabilities.


The Probe, Issue 78 - December 1987 Dec 1987

The Probe, Issue 78 - December 1987

The Probe: Newsletter of the National Animal Damage Control Association

THE PROBE
National Animal Damage Control Association
DECEMBER, 1987
3rd Wildlife Damage Control Conference
EPA
Audubon Magazine
Black Bears
APHIS Activity Report
Gray Squirrels
Letters to Ye Ed
Steel-jaw Traps
The American Veterinary Medical Assoc. Executive Beard revised its position statement on traps
Guard Dogs
Coyote Control by Air
Personnel


Wetlands Board Bulletin Vol. Ii, No. 3, Virginia Institute Of Marine Science Dec 1987

Wetlands Board Bulletin Vol. Ii, No. 3, Virginia Institute Of Marine Science

Virginia Wetlands Reports

  • Tidal Vegetated Wetlands and Shoreline Information by Political Subdivision.
  • A Note From the Virginia Marine Resource Commission: Tracking Wetlands Permit Applications.
  • Wetlands and Coastal Primary Sand Dune Violation Procedures Jurisdictional Boundaries for Shorelines Charts


Monthly Planet, 1987, December, Erin Wright, Huxley College Of The Environment, Western Washington University Dec 1987

Monthly Planet, 1987, December, Erin Wright, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.


Wastewater Management Alternatives For The Salt Pond Region Of Westerly, Rhode Island (With Special Emphasis On The Winnapaug Pond Watershed), John R. King Dec 1987

Wastewater Management Alternatives For The Salt Pond Region Of Westerly, Rhode Island (With Special Emphasis On The Winnapaug Pond Watershed), John R. King

Theses and Major Papers

As people move toward the coasts in growing numbers, the coastal zone is faced with ever increasing development pressures. The Town of Westerly, Rhode Island is experiencing many of the problems associated with these pressures. In order to expand a motel in the Misquamicut section of Westerly, the current owner of the property has proposed to extend city sewer lines to this area at his own cost. Afterward the line would be turned over to the town. While extension of sewer lines may relieve some local septic system failure problems, it could also spur more rapid and extensive growth. Over-development ...


Electric Field And Plasmadensity Measurements In The Strongly-Driven Daytime Equatorial Electrojet: 1. The Unstablelayer And Gradient Drift Waves, R. F. Pfaff, M. C. Kelley, E. Kudeki, Bela G. Fejer, K. D. Baker Dec 1987

Electric Field And Plasmadensity Measurements In The Strongly-Driven Daytime Equatorial Electrojet: 1. The Unstablelayer And Gradient Drift Waves, R. F. Pfaff, M. C. Kelley, E. Kudeki, Bela G. Fejer, K. D. Baker

Bela G. Fejer

Electric field and plasma density instrumentation on board a sounding rocket launched from Punta Lobos, Peru, detected intense electrostatic waves indicative of plasma instabilities in the daytime equatorial electrojet. Simultaneous measurements taken by the Jicamarca radar showed strong 3-m type 1 electrojet echoes as well as evidence of kilometer scale horizontally propagating waves. The in situ electric field wave spectra displayed three markedly different height regions within the unstable layer: (1) a two-stream region on the topside between 103 and 111 km where the electron current was considered to be strongest, (2) a gradient drift region between 90 and 106 ...


The Condor Equatorial Electrojetcampaign: Radar Results, E. Kudeki, Bela G. Fejer, D. T. Farley, C. Hanuise Dec 1987

The Condor Equatorial Electrojetcampaign: Radar Results, E. Kudeki, Bela G. Fejer, D. T. Farley, C. Hanuise

Bela G. Fejer

A review of the experimental and theoretical background to the Condor equatorial electrojet campaign is followed by the presentation and discussion of VHF radar interferometer and HF radar backscatter data taken concurrently with two rocket in situ experiments reported in companion papers (Pfaff et al., this issue (a, b). Both experiments were conducted in strongly driven periods with the on-line radar interferometer displaying signatures of what has been interpreted in earlier radar work (Kudeki et al., 1982) as kilometer scale gradient drift waves. Low-frequency density fluctuations detected by in situ rocket sensors confirm the earlier interpretation. VHF radar/rocket data ...


Electric Field And Plasmadensity Measurements In The Strongly-Driven Daytime Equatorial Electrojet: 2. Two-Streamwaves, R. F. Pfaff, M. C. Kelley, E. Kudeki, Bela G. Fejer, K. D. Baker Dec 1987

Electric Field And Plasmadensity Measurements In The Strongly-Driven Daytime Equatorial Electrojet: 2. Two-Streamwaves, R. F. Pfaff, M. C. Kelley, E. Kudeki, Bela G. Fejer, K. D. Baker

Bela G. Fejer

Both primary and secondary two-stream (Farley-Buneman) waves have been detected by in situ electric field and plasma density probes in the strongly driven daytime equatorial electrojet over Peru. Simultaneous Jicamarca radar observations showed strong vertical and oblique 3-m type 1 echoes, also indicative of the two-stream mechanism. The rocket data show the two-stream region on the topside of the unstable layer to be situated between 103 and 111 km where the electron current was the strongest. This region was characterized by broadband plasma oscillations extending past 1 kHz in the rocket frame. Furthermore, above 106.5 km, where the electron ...


Multilist And Inverted File System Performance Measurements, Ashok Chandramouli, George Winston Zobrist Dec 1987

Multilist And Inverted File System Performance Measurements, Ashok Chandramouli, George Winston Zobrist

Computer Science Technical Reports

This study evaluates the multilist and inverted file systems. It describes the structure of the two file system and then proceeds to investigate the performance. The performance is based on quantitative estimates of space requirements for file system, time to retrieve records, time to insert a record, time to delete a record, time to update a record and time to exhaustively read and reorganize the file system. The study then investigates specific situations in which one file system seems to perform better than the other.


Performance Parameter Measurements Of Generic Files, Sankarraman Subramanian, George Winston Zobrist Dec 1987

Performance Parameter Measurements Of Generic Files, Sankarraman Subramanian, George Winston Zobrist

Computer Science Technical Reports

This study discusses the performance parameter measurements of generic files, the pile file, the sequential file, the indexed-sequential file, the indexed file and the direct file. The file performance measurements are compiled in a software package. The study then describes the use of such software package as a simulation tool in a file design environment.


Heuristic Coloring Algorithm For The Composite Graph Coloring Problem, Johnnie C. Roberts, Billy E. Gillett Dec 1987

Heuristic Coloring Algorithm For The Composite Graph Coloring Problem, Johnnie C. Roberts, Billy E. Gillett

Computer Science Technical Reports

A composite graph is a finite undirected graph in which a positive integer known as a chromaticity is associated with each vertex of the graph. The composite graph coloring problem (CGCP) is the problem of finding the chromatic number of a composite graph, i.e., the minimum number of colors (positive integers) required to assign a sequence of consecutive colors to each vertex of the graph in a manner such that adjacent vertices are not assigned sequences with colors in common and the sequence assigned to a vertex has the number of colors indicated by the chromaticity of the vertex ...


Effect Of Hybridization On 4d→4f Spectra In Light Lanthanides, David W. Lynch, R. D. Cowan Dec 1987

Effect Of Hybridization On 4d→4f Spectra In Light Lanthanides, David W. Lynch, R. D. Cowan

Physics and Astronomy Publications

The effect of the hybridization of 4f electrons on La, Ce, and Pr tripositive ions with ligand states or conduction electrons was simulated by reducing the Slater integrals involving the 4f electrons by 10% or 20%, depending on whether the integrand involves one or two 4f electrons, respectively. The dipole-allowed 4d→4f spectra were calculated. Observable effects, changes in line energies, and oscillator strengths, were compared with limited data available for ionic and metallic solids containing these lanthanides, and for Ce vapor. Many of the observed changes in the 4d→4f spectra attributed to hybridization effects are ...


“Macromolecules 86": An International Conference On Functional Polymers And Biopolymers, Otto Vogl, Geoffrey C. Eastmond Dec 1987

“Macromolecules 86": An International Conference On Functional Polymers And Biopolymers, Otto Vogl, Geoffrey C. Eastmond

Otto Vogl

No abstract provided.


Moment Analysis Of The Cluster-Size-Distribution Approach To Scaling During Coagulation, Thomas W. Taylor, C. M. Sorensen Dec 1987

Moment Analysis Of The Cluster-Size-Distribution Approach To Scaling During Coagulation, Thomas W. Taylor, C. M. Sorensen

Physics Faculty Publications

We study the temporal approach of a cluster size distribution to its asymptotic scaling form. By enforcing consistency between the distribution’s zeroth moment derived from both the Smoluchowski equation and the scaling distribution ansatz, we find values for the scaling exponents w and z in terms of the scaling exponent τ and the kernel homogeneity λ which are not equivalent to their asymptotic, scaling forms. The predicted values do agree well, however, with intermediate time values found in simulations by Kang, Redner, Meakin, and Leyvraz [Phys Rev. A 33, 1171 (1986)]. By enforcing consistency between all moment orders, the ...


Cenozoic Paleoceanography 1986: An Introduction, W. H. Berger, Larry A. Mayer Dec 1987

Cenozoic Paleoceanography 1986: An Introduction, W. H. Berger, Larry A. Mayer

Affiliate Scholarship

New developments in Cenozoic paleoceanography include the application of climate models and atmospheric general circulation models to questions of climate reconstruction, the refinement of conceptual models for interpretation of the carbon isotope record in terms of carbon mass balance, paleocirculation, paleoproductivity, and the regional mapping of paleoceanographic events by acoustic stratigraphy. Sea level change emerges as a master variable to which changes in the ocean environment must be traced in many cases, and tests of the onlap-offlap paradigm therefore are of crucial importance.


Nutrient Losses From Conventional And No-Till Cornfields, Robert L. Blevins, Wilbur Frye Dec 1987

Nutrient Losses From Conventional And No-Till Cornfields, Robert L. Blevins, Wilbur Frye

Soil Science News and Views

Farmers must be concerned about both the monetary loss and the threat of groundwater and surface water pollution associated with the loss of plant nutrients from their fields. There is also an increasing public concern about pollution and the role of agriculture in nonpoint-source pollution. Movement of water over the surface of the soil as well as through the soil profile increases the potential for loss of water-soluble nutrients, especially nitrates.


Electrooptic And Piezoelectric Measurements In Photorefractive Barium Titanate And Strontium Barium Niobate, Stephen Ducharme, Jack Feinberg, R.R. Neurgaonkar Dec 1987

Electrooptic And Piezoelectric Measurements In Photorefractive Barium Titanate And Strontium Barium Niobate, Stephen Ducharme, Jack Feinberg, R.R. Neurgaonkar

Stephen Ducharme Publications

We have measured the low-frequency ("unclamped") electrooptic and piezoelectric coefficients in undoped BaTiO3and SrxBa1-xNb2O6 (x = 0.61) crystals using interferometric techniques. The contribution of the piezoelectric effect to the Pockels measurements is discussed. For an applied ac electric field in the range 0.1-200 V/cm, the electrooptic and piezoelectric effects are linear in the magnitude of the applied field and independent of its frequency in the range 10 Hz-100 kHz. The unclamped electrooptic coefficients of poled BaTiO3 single crystals are r13= 19.5 pm ±1 pm/V and ...