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1997

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Articles 1321 - 1350 of 2472

Full-Text Articles in Physical Sciences and Mathematics

Quantitation Of Ethidium-Stained Closed Circular Dna In Agarose Gels, Michael F. Shubsda, Jerry Goodisman, James C. Dabrowiak Feb 1997

Quantitation Of Ethidium-Stained Closed Circular Dna In Agarose Gels, Michael F. Shubsda, Jerry Goodisman, James C. Dabrowiak

Chemistry - All Scholarship

The fluorescence of ethidium bromide (EB) bound to equimolar amounts of supercoiled form I and unstrained linear form III pBR322, SV40 and PM2 DNA in agarose gels has been measured by scanning a photographic negative of the gel with a microdensitometer. For SV40 and PM2 DNA, commonly used staining conditions cause both forms, i.e. linear and supercoiled, to fluoresce to the same extent. This obviates the need to use a correction factor for the fluorescence of form I DNA when measuring the amount of this form relative to the amounts of unstrained forms in agarose gels. In the case of …

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Canadian Cooperative Wildlife Health Center Newsletter, Volume 5-1, Winter 1997 Feb 1997

Canadian Cooperative Wildlife Health Center Newsletter, Volume 5-1, Winter 1997

Canadian Cooperative Wildlife Health Centre: Newsletters and Publications

New Voice in CCWHC - Ontario Region
Volunteers in Saskatoon
Botulism on the Prairies: Another Bad Year, With New Wrinkles
Necropsy of a Right Whale on Long Island, Nova Scotia
Morbillivirus Infection in Four Lynx
Ethylene Glycol Intoxication in a Raccoon
Risk of Morbillivirus to Belugas
Bullfrog Mortality in a Man-Made Pond
Snow Goose Mortality - Fort Severn, Ontario
Thick-billed Murres
Barbiturate Poisoning of Bald Eagles
Diseases in Endangered Marmots
Fish Deaths Caused by Parasites
Outbreak of Viral Disease in Tiger Salamanders

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Automatic Video Pause Detection Filter, Xiaowen Liu, Charles B. Owen, Fillia S. Makedon Feb 1997

Automatic Video Pause Detection Filter, Xiaowen Liu, Charles B. Owen, Fillia S. Makedon

Computer Science Technical Reports

Increasing interest in multimedia research has been drawn upon the development of video indexing and content-based image retrieval techniques. In this report, we proposed several pause detection algorithms, which instead of searching for significant visual transitions, the algorithms detect significant pauses in video streams. A realization of the algorithms was implemented using ImageTcl toolkit developed at Dartmouth Experimental Visualization Laboratory. In addition to proposing and studying the effectiveness of the pause detection algorithms, another major goal will be to incorporate our algorithms into ImageTcl and test the stability and applicability of the ImageTcl environment. Priliminary experiments showed relatively good results …

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Asml: Automatic Site Markup Language 1.03, Charles B. Owen, Fillia Makedon, Glen Frank, Michael Kenyon Feb 1997

Asml: Automatic Site Markup Language 1.03, Charles B. Owen, Fillia Makedon, Glen Frank, Michael Kenyon

Computer Science Technical Reports

Creation of large and complex World Wide Web sites is hampered by the "page at a time" approach of many tools and the programming knowledge and custom software development required for automated solutions. This report describes the development of the Automatic Site Markup Language (ASML). ASML is a new markup language designed to produce large, complicated web sites which can include dynamic content. ASML extends HTML with new, high-level features while still preserving complete compatibility with common browser and server technologies. It has powerful indexing and searching facilities, and enables the automatic translation of document formats. Most importantly, ASML provides …

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Active Gateway: A Facility For Video Conferencing Traffic Control, Shunge Li, Bharat Bhargava Feb 1997

Active Gateway: A Facility For Video Conferencing Traffic Control, Shunge Li, Bharat Bhargava

Department of Computer Science Technical Reports

No abstract provided.

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Sampling And Reconstructing Manifolds Using Alpha-Shapes, Fausto Bernardini, Chandrajit L. Bajaj Feb 1997

Sampling And Reconstructing Manifolds Using Alpha-Shapes, Fausto Bernardini, Chandrajit L. Bajaj

Department of Computer Science Technical Reports

No abstract provided.

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Softlab: A Virtual Laboratory Framework For Computational Science, A. C. Catlin, M. G. Gaitatzes, Elias N. Houstis, Z. Ma, S. Markus, Nien-Hwa Wang, S. Weerawarana Feb 1997

Softlab: A Virtual Laboratory Framework For Computational Science, A. C. Catlin, M. G. Gaitatzes, Elias N. Houstis, Z. Ma, S. Markus, Nien-Hwa Wang, S. Weerawarana

Department of Computer Science Technical Reports

No abstract provided.

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Centimeter-Wave Reflection In The Nitrates And Nitrites Of Sodium And Potassium: Experiment And Theory, Steven G. Cornelison, Arthur Guass, Jr., J. Krane, John R. Hardy Feb 1997

Centimeter-Wave Reflection In The Nitrates And Nitrites Of Sodium And Potassium: Experiment And Theory, Steven G. Cornelison, Arthur Guass, Jr., J. Krane, John R. Hardy

John R. Hardy Papers

Temperature-dependent centimeter-wave reflection is studied in powdered samples of potassium nitrate (KNO3), potassium nitrite (KNO2), sodium nitrate (NaNO3), and sodium nitrite (NaNO2). Temperature-dependent reflection measurements at centimeter-wave frequencies were performed on an HP8510B Network analyzer based reflectometer. These measurements are compared to calculations utilizing a Debye relaxation model. Reflection losses seen in KNO2 and NaNO2 are expected to be due to the presence of permanent dipoles that are excited to ‘‘hopping’’ modes as the temperature is raised. Although NaNO3 shows little reflection losses, KNO3 shows significant losses as …

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Photoluminescence Properties Of Silicon Quantum-Well Layers, Peter N. Saeta, A. C. Gallagher Feb 1997

Photoluminescence Properties Of Silicon Quantum-Well Layers, Peter N. Saeta, A. C. Gallagher

All HMC Faculty Publications and Research

Nanometer-scale crystal silicon films surrounded by SiO2 were prepared by oxidizing silicon-on-insulator substrates prepared from SIMOX (separation by implantation of oxygen) and crystallized hydrogenated amorphous silicon films. Average silicon layer thickness was determined from reflection spectra. When sufficiently thin (<2 >nm), all layers emitted red photoluminescence under blue and UV cw excitation, with a spectrum that did not depend on the mean layer thickness. The spectrum was roughly Gaussian with a peak energy of 1.65 eV, which is lower than for most porous silicon spectra. The time scale for the luminescence decay was ~35 μs at room temperature and …

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Ua66/3/2 Computer Science Alumni Newsletter, Vol. 10, Wku Computer Science Feb 1997

Ua66/3/2 Computer Science Alumni Newsletter, Vol. 10, Wku Computer Science

WKU Archives Records

Newsletter created by WKU Computer Science for alumni of the program.

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Some Relationships Between Foies And Sigma 1 1 Arity Hierarchies, Guozhu Dong, Limsoon Wong Feb 1997

Some Relationships Between Foies And Sigma 1 1 Arity Hierarchies, Guozhu Dong, Limsoon Wong

Kno.e.sis Publications

No abstract provided.

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Fragment Multiplicity Dependent Charge Distributions In Heavy Ion Collisions, M. B. Tsang, C. Williams, M. J. Huang, W. G. Lynch, L. Phair, D. R. Bowman, J. Dinius, C. K. Gelbke, D. O. Handzy, W. C. Hsi, G. J. Kunde, M. A. Lisa, Graham F. Peaslee, A. Botvina, M-C. Lemaire, S. R. Souza, G. Van Buren, R. J. Charity, L. G. Sobotka, C. Schwarz, U. Lynen, J. Pochodzalla, H. Sann, W. Trautmann, D. Fox, R. T. De Souza, N. Carlin Feb 1997

Fragment Multiplicity Dependent Charge Distributions In Heavy Ion Collisions, M. B. Tsang, C. Williams, M. J. Huang, W. G. Lynch, L. Phair, D. R. Bowman, J. Dinius, C. K. Gelbke, D. O. Handzy, W. C. Hsi, G. J. Kunde, M. A. Lisa, Graham F. Peaslee, A. Botvina, M-C. Lemaire, S. R. Souza, G. Van Buren, R. J. Charity, L. G. Sobotka, C. Schwarz, U. Lynen, J. Pochodzalla, H. Sann, W. Trautmann, D. Fox, R. T. De Souza, N. Carlin

Faculty Publications

The dependence of intermediate-mass-fragment (IMF) element distributions on the multiplicity, NIMF, of detected fragments has been measured for 84Kr+197Au collisions at E/A=35, 55, 70, 100, 200, and 400 MeV. The observed dependence can be parametrized as P(NIMF|Z)∝P(Z)exp(-c⋅NIMF⋅Z), where c is a beam-energy and excitation-energy dependent parameter. Previous work indicated this parameter is zero in the liquid-gas coexistence region and positive in the gaseous phase. In contrast, we observe both negative and positive values for c, revealing the meaning of this parameter to be less straightforward than previously assumed. The magnitude of c appears nonetheless to provide a nontrivial test of …

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Experiments In Aggregating Air Ordnance Effectiveness Data For The Tacwar Model, James E. Parker Feb 1997

Experiments In Aggregating Air Ordnance Effectiveness Data For The Tacwar Model, James E. Parker

Theses and Dissertations

An interactive MS Access&trademark; based application that aggregates the output of the SABSEL model for input into the TACWAR model is developed. The application was developed following efforts to create a functional approximation of the SABSEL data using neural networks, statistical networks, and traditional statistical techniques. These approximations were compared to a look-up table methodology on the basis of accuracy, (RMSE

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Dynamic Correlations In Porous Media, J.C. Lee Feb 1997

Dynamic Correlations In Porous Media, J.C. Lee

Faculty Publications

When binary liquid mixtures are infused into various random porous media, past experiment have shown that different media affect the dynamic correlations of concentration fluctuations in different ways. Vycor glasses of relatively small pore size and dilute gels allow the exponential bulk mode to remain in the final ensemble average, but Vycor glasses of vary large pore size do not. We take this to mean that the relaxation time of the bulk mode is spatialIy homogeneous in the two former media but heterogeneous in the latter media. Thus we search for a heterogeneous dynamic mode with an Ising model. We …

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Disk-Directed I/O For Mimd Multiprocessors, David Kotz Feb 1997

Disk-Directed I/O For Mimd Multiprocessors, David Kotz

Dartmouth Scholarship

Many scientific applications that run on today's multiprocessors, such as weather forecasting and seismic analysis, are bottlenecked by their file-I/O needs. Even if the multiprocessor is configured with sufficient I/O hardware, the file-system software often fails to provide the available bandwidth to the application. Although libraries and enhanced file-system interfaces can make a significant improvement, we believe that fundamental changes are needed in the file-server software. We propose a new technique, disk-directed I/O, to allow the disk servers to determine the flow of data for maximum performance. Our simulations show that tremendous performance gains are possible both for simple reads …

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On The Classification Of Computable Languages, John Case, Efim Kinber, Arun Sharma, Frank Stephan Feb 1997

On The Classification Of Computable Languages, John Case, Efim Kinber, Arun Sharma, Frank Stephan

School of Computer Science & Engineering Faculty Publications

A one-sided classifier converges to 1 on every set inside a given class and outputs infinitely often a 0 on every set outside the class. A two-sided classifier converges in the first case to 1 and in the second to 0. This paper considers one-sided and two-sided classifiers dealing with computable sets as input. It provides theorems from which the classifiability of natural examples can be assessed and investigates the relations of the types of classification to inductive learning theory and structural complexity theory in terms of Turing degrees. Furthermore, it deals with the special cases of classification from positive …

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Epr Studies On The Mono- And Dicobalt(Ii)-Substituted Forms Of The Aminopeptidase From Aeromonas Proteolytica. Insight Into The Catalytic Mechanism Of Dinuclear Hydrolases, Brian Bennett, Richard C. Holz Feb 1997

Epr Studies On The Mono- And Dicobalt(Ii)-Substituted Forms Of The Aminopeptidase From Aeromonas Proteolytica. Insight Into The Catalytic Mechanism Of Dinuclear Hydrolases, Brian Bennett, Richard C. Holz

Physics Faculty Research and Publications

The structure and function of the prototypical dinuclear hydrolase, namely, the aminopeptidase from Aeromonas proteolytica (AAP), was probed by EPR spectroscopy of the mono- and dicobalt(II)-substituted derivatives. A new systematic protocol for the interpretation of Co(II) EPR spectra is described and the S = 3/2 spin states of the Co(II)-substituted forms of the enzyme have been characterized. This protocol allows the simulation of line shape using theoretically allowed geff values corresponding to an isotropic greal value. In addition, the gross distortion of EPR spectra of high-spin S = 3/2 Co(II) ions has been investigated, …

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Thermoconvective Instability Of Paramagnetic Fluids In A Uniform Magnetic Field, J. Huang, Boyd F. Edwards, D. D. Gray Feb 1997

Thermoconvective Instability Of Paramagnetic Fluids In A Uniform Magnetic Field, J. Huang, Boyd F. Edwards, D. D. Gray

All Physics Faculty Publications

The effect of a uniform oblique magnetic field on a laterally unbounded insulating paramagnetic fluid layer heated from below is studied using a linear stability analysis of the Navier–Stokes equations supplemented by Maxwell’s equations and the appropriate magnetic body force. Two-dimensional rolls in an arbitrary vertical plane are considered. Longitudinal rolls with axes parallel to the horizontal component of the field are the rolls most unstable to convection. The corresponding critical Rayleigh number and critical wavelength for the onset of such rolls are less than the well-known Rayleigh–Bénard values in the absence of magnetic fields. Vertical fields maximize these deviations, …

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Minimizing Channel Density With Movable Terminals, Ronald I. Greenberg, Jau-Der Shih Feb 1997

Minimizing Channel Density With Movable Terminals, Ronald I. Greenberg, Jau-Der Shih

Computer Science: Faculty Publications and Other Works

We give algorithms to minimize density for VLSI channel routing problems with terminals that are movable subject to certain constraints. The main cases considered are channels with linear order constraints, channels with linear order constraints and separation constraints, channels with movable modules containing fixed terminals, and channels with movable modules and terminals. In each case, we improve previous results for running time and space by a factor of L/\lgn and L, respectively, where L is the channel length, and n is the number of terminals.

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Core-Log-Seismic Integration As A Framework For Determining The Basin-Wide Significance Of Regional Reflectors In The Eastern Equatorial Pacific, Stephen F. Bloomer, Larry A. Mayer Feb 1997

Core-Log-Seismic Integration As A Framework For Determining The Basin-Wide Significance Of Regional Reflectors In The Eastern Equatorial Pacific, Stephen F. Bloomer, Larry A. Mayer

Affiliate Scholarship

ODP Leg 138 in the eastern equatorial Pacific (EEP) provided a unique opportunity to understand the paleoceanographic significance of seismic reflectors in this climatically sensitive region. Carefully offset multiple cores were spliced into a complete stratigraphic section for the upper 250 m at each site and accurate, astronomically tuned time scales were generated from these composites. Well log data provided a means to correct composite depths to true depths as well as density and velocity data for the generation of synthetic seismograms. These synthetic seismograms were used to determine the paleoceanographic significance of regionally traceable reflectors by linking variations in …

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New Constraints On Source Processes Of Volcanic Tremor At Arenal Volcano, Costa Rica, Using Broadband Seismic Data, John P. Benoit, Stephen R. Mcnutt Feb 1997

New Constraints On Source Processes Of Volcanic Tremor At Arenal Volcano, Costa Rica, Using Broadband Seismic Data, John P. Benoit, Stephen R. Mcnutt

School of Geosciences Faculty and Staff Publications

Broadband seismic data recorded 2.3 km from the active vent of Arenal Volcano, Costa Rica, provide new constraints on tremor source processes. Arenal's tremor contains as many as seven harmonics, whose frequencies vary temporally by up to 75 percent, from initial values of 1.9 Hz for the first peak immediately following explosive eruptions to 3.2–3.5 Hz several minutes later. We infer that gas bubble concentration is variable within the conduit and also changes as a function of time, thereby changing the acoustic velocity. We infer that the source is a shallow, 200–660 m-long, vertically oriented 1-D resonator with matched boundary …

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Transportable Information Agents, Daniela Rus, Robert Gray, David Kotz Feb 1997

Transportable Information Agents, Daniela Rus, Robert Gray, David Kotz

Dartmouth Scholarship

Transportable agents are autonomous programs. They can move through a heterogeneous network of computers under their own control, migrating from host to host. They can sense the state of the network, monitor software conditions, and interact with other agents or resources. The network-sensing tools allow our agents to adapt to the network configuration and to navigate under the control of reactive plans. In this paper we describe the design and implementation of the navigation system that gives our agents autonomy. We also discuss the intelligent and adaptive behavior of autonomous agents in distributed information-gathering tasks.

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Optical And Magneto-Optical Constants Of Mnpt3, K. W. Wierman, J. N. Hilfiker, R. F. Sabiryanov, Sitaram S. Jaswal, Roger D. Kirby, John A. Woollam Feb 1997

Optical And Magneto-Optical Constants Of Mnpt3, K. W. Wierman, J. N. Hilfiker, R. F. Sabiryanov, Sitaram S. Jaswal, Roger D. Kirby, John A. Woollam

Department of Physics and Astronomy: Faculty Publications

Optically thick films of MnPt3 were deposited on quartz using dc magnetron sputtering. The films were covered with an SiOx protective overcoat and annealed in vacuum at 850 °C for 1 h to form the crystalline L12 (Cu3Au) cubic structure. These films have a high degree of long-range order and are highly textured with the (111) axis along the film normal. Variable angle spectroscopic ellipsometry measurements were taken over the spectral range of 1.2–4.2 eV to determine the optical constants of both MnPt3 and the SiOx overcoat. Spectroscopic magneto-optic Kerr rotation and …

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On A Proximal Point Method For Optimization In Banach Spaces, Alfredo N. Iusem, Dan Butnariu Feb 1997

On A Proximal Point Method For Optimization In Banach Spaces, Alfredo N. Iusem, Dan Butnariu

Mathematics Technical Papers

We analyze the behavior of a parallel proximal point method for solving convex optimization problems in reflexive Banach spaces. Similar algorithms were known to converge under the implicit assumption that the norm of the space is Hilbertian. We extend the area of applicability of the proximal point method to solving convex optimization problems in Banach spaces on which totally convex functions can be found. This includes the class of all smooth uniformly convex Banach spaces. Also, our convergence results leave more flexibility for the choice of the penalty function involved in the algorithm and, in this way, allow simplification of …

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Studies Of Qcd In E+E- → Hadrons At Ecm = 130 And 136 Gev, D. Buskulic, M. Thulasidas Feb 1997

Studies Of Qcd In E+E- → Hadrons At Ecm = 130 And 136 Gev, D. Buskulic, M. Thulasidas

Research Collection School Of Computing and Information Systems

Studies of QCD in e+e−→e+e−→ Hadrons at Ecm=Ecm=} 130 and 136 GeV The ALEPH Collaboration An analysis of the properties of hadronic final states produced in electron-positron annihilation at centre-of-mass energies of 130 and 136 GeV is presented. The measurements are based on a data sample of 5.7 pb−1pb−1 collected in November 1995 with the \Aleph detector at LEP. Inclusive charged particle distributions, jet rates and event-shape distributions are measured and the results are compared with the predictions of QCD-based models. From the measured distributions quantities are determined for which the dependence on the centre-of-mass energy can be predicted by …

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Inductive Neural Logic Network And The Scm Algorithm, Ah-Hwee Tan, Loo-Nin Teow Feb 1997

Inductive Neural Logic Network And The Scm Algorithm, Ah-Hwee Tan, Loo-Nin Teow

Research Collection School Of Computing and Information Systems

Neural Logic Network (NLN) is a class of neural network models that performs both pattern processing and logical inferencing. This article presents a procedure for NLN to learn multi-dimensional mapping of both binary and analog data. The procedure, known as the Supervised Clustering and Matching (SCM) algorithm, provides a means of inferring inductive knowledge from databases. In contrast to gradient descent error correction methods, pattern mapping is learned by an inductive NLN using fast and incremental clustering of input and output patterns. In addition, learning/encoding only takes place when both the input and output match criteria are satisfied in a …

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Across-Column Cracks And Axial Splits In S2 Saline Ice Under Compression, E. M. Schulson, S. Qi, J. S. Melton, E. T. Gratz Feb 1997

Across-Column Cracks And Axial Splits In S2 Saline Ice Under Compression, E. M. Schulson, S. Qi, J. S. Melton, E. T. Gratz

Dartmouth Scholarship

Experiments on plate-like specimens have established that across-column cracks from within S2 (columnar) salt-water ice when compressed uniaxially along a direction inclined to the long axis of the grains. Wing cracks initiate from the across-column cracks and lengthen into axial splits when the ice is rapidly deformed; correspondingly; the macroscopic behavior changes from ductile to brittle. The across-column cracking is attributed to grain-boundary sliding, and the splitting to the suppression of crack-tip creep.

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An Efficient Scheme For A Distributed Video Retrieval System For Remote Users, Fillia Makedon, James Matthews, Charles Owen, Samuel Rebelsky Feb 1997

An Efficient Scheme For A Distributed Video Retrieval System For Remote Users, Fillia Makedon, James Matthews, Charles Owen, Samuel Rebelsky

Computer Science Technical Reports

The new era of digital video and multimedia technologies has created the potential for large libraries of digital video. With this new technology come the challenges of creating usable means by which such large and diverse depositories of digital information (digital libraries) can be efficiently queried and accessed so that (a) the response is fast, (b) the communication over the Internet is minimal and (c) the retrieval is characterized by high precision and recall. In this paper we discuss how existing digital video editing tools, together with data compression techniques, can be combined to create a fast, accurate and cost …

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Conformations And Relative Stabilities Of The Cis And Trans Isomers In A Series Of Isolated N-Phenylamides, V. P. Manea, K. J. Wilson, John R. Cable Feb 1997

Conformations And Relative Stabilities Of The Cis And Trans Isomers In A Series Of Isolated N-Phenylamides, V. P. Manea, K. J. Wilson, John R. Cable

Chemistry Faculty Publications

The gas-phase conformations of a series of isolated N-phenylamides have been determined from vibrationally resolved electronic spectra obtained by resonant two-photon ionization in a supersonic jet expansion. Both the cis and trans isomers of formanilide were identified, with the cis isomer in 6.5% abundance. The spectral features displayed by this isomer are consistent with a nonplanar geometry which undergoes a large change in the phenyl torsional angle following electronic excitation. The more abundant trans isomer of formanilide adopts a planar structure and is stabilized by 2.5 kcal/mol with respect to the cis isomer. In the excited electronic state the relative …

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A Guide To Mechanical Range Regeneration, J. Addison Feb 1997

A Guide To Mechanical Range Regeneration, J. Addison

Bulletins 4000 -

The main objective of this Bulletin is to describe mechanical methods of promoting rangeland regeneration and how to determine which is the most appropriate to use on any particular site. Mechanical regeneration methods are not 'quick fix' but may be used to advantage in some rangeland regeneration strategies.

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