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Articles 21571 - 21600 of 21971

Full-Text Articles in Physical Sciences and Mathematics

Speedreading, Marcel Just, Patricia Carpenter Dec 1986

Speedreading, Marcel Just, Patricia Carpenter

Marcel Adam Just

No abstract provided.

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Dedekind Finiteness In Topoi, Lawrence Stout Dec 1986

Dedekind Finiteness In Topoi, Lawrence Stout

Lawrence N. Stout

A Dedekind finite object in a topos is an object such that any monic endomorphism is an epimorphism. This paper proves the basic properties of Dedekind finiteness and then gives examples which show that the class of Dedekind finite objects is not closed under quotients, subobjects, exponentiation, or finite powerobjects. Examples also show that having no nontrivial epic endomorphisms is distinct from Dedekind finiteness.

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Indirect Determination Of A Local Ph Change By Surface-Enhanced Raman Spectroscopy, Mark Anderson, Dennis Evans, Mary Wirth Dec 1986

Indirect Determination Of A Local Ph Change By Surface-Enhanced Raman Spectroscopy, Mark Anderson, Dennis Evans, Mary Wirth

Mark R. Anderson

No abstract is currently available.

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Method And Apparatus For Division Pct:Ep0075745, Robert Iannucci, James Kleinsteiber Dec 1986

Method And Apparatus For Division Pct:Ep0075745, Robert Iannucci, James Kleinsteiber

Robert A Iannucci

No abstract provided.

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Measuring And Managing Software Reliability, Robert Yacobellis Dec 1986

Measuring And Managing Software Reliability, Robert Yacobellis

Robert H Yacobellis

No abstract provided.

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Nuclease Activity Of 1,10-Phenanthroline-Copper Ion. Chemistry Of Deoxyribose Oxidation, Thomas Goyne, David Sigman Dec 1986

Nuclease Activity Of 1,10-Phenanthroline-Copper Ion. Chemistry Of Deoxyribose Oxidation, Thomas Goyne, David Sigman

Thomas Goyne

No abstract provided.

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High Performance Memory System Utilizing Pipelining Techniques Us:4685088, Robert Iannucci Dec 1986

High Performance Memory System Utilizing Pipelining Techniques Us:4685088, Robert Iannucci

Robert A Iannucci

No abstract provided.

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Determination Of Electrochemical Kinetic Parameters Using The Bond-Henderson-Oldham Global Analysis, Mark Anderson, Dennis Evans Dec 1986

Determination Of Electrochemical Kinetic Parameters Using The Bond-Henderson-Oldham Global Analysis, Mark Anderson, Dennis Evans

Mark R. Anderson

No abstract is currently available.

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Dyslexia, Marcel Adam Just, Patricia A. Carpenter Dec 1986

Dyslexia, Marcel Adam Just, Patricia A. Carpenter

Marcel Adam Just

No abstract provided.

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Global Existence Of Nonoscillatory Solutions Of Perturbed General Disconjugate Equations, William F. Trench, T. Kusano Dec 1986

Global Existence Of Nonoscillatory Solutions Of Perturbed General Disconjugate Equations, William F. Trench, T. Kusano

William F. Trench

No abstract provided.

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Existence And Nonoscillation Theorems For An Emden-Fowler Equation With Deviating Argument, William F. Trench Dec 1986

Existence And Nonoscillation Theorems For An Emden-Fowler Equation With Deviating Argument, William F. Trench

William F. Trench

No abstract provided.

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Theoretical Studies Of The Reactions Xhn → Xhn-1- + H+ And Xhn-1- + Sih4 → [Sih4xhn-1]-, Mark S. Gordon, Larry P. Davis, Larry W. Burggraf, Robert Damrauer Dec 1986

Theoretical Studies Of The Reactions Xhn → Xhn-1- + H+ And Xhn-1- + Sih4 → [Sih4xhn-1]-, Mark S. Gordon, Larry P. Davis, Larry W. Burggraf, Robert Damrauer

Mark S. Gordon

Ab initio and MNDO calculations have been carried out to evaluate the gas-phase acidities of closed-shell XHn compounds (X= C, N, 0, F, Si, P, S, Cl) and the affinities of silane for the XHn_1- anions. Fourth-order perturbation theory with extended basis sets reproduces the experimental gas-phase acidities to within 2 kcaljmol. Stable pentacoordinated silicon anions are found for X = H, C, N, 0, and F. In contrast, only marginally stable charge-dipole complexes are found for X = Si, S, and Cl.

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On The Glass Transition And Viscosity Of Phosphorus Pentoxide, C. A. Angell, Steve W. Martin Dec 1986

On The Glass Transition And Viscosity Of Phosphorus Pentoxide, C. A. Angell, Steve W. Martin

Steve W. Martin

The calorimetric glass transition temperature Tg for pure anhydrous P2Os melted in sealed Si02 ampules at 1000 “C has been obtained directly for the first time with differential scanning calorimetry, and the increase in heat capacity at Tg has been determined. Tg measured in this way is 57 K higher than the value quoted in the literature, which is probably based on an Arrhenius law extrapolation of viscosity data to 9 = lOI3 P. Combining the high-temperature viscosity data with the common observation that, for oxide glasses, 7 = 10l2 P at the DSC Tg, we find that the P,O, …

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Auroral E-Region Plasma Waves Andelevated Electron Temperatures, Bela G. Fejer, J. Providakes, D. T. Farley, W. E. Swartz Dec 1986

Auroral E-Region Plasma Waves Andelevated Electron Temperatures, Bela G. Fejer, J. Providakes, D. T. Farley, W. E. Swartz

Bela G. Fejer

We have observed 3-m auroral E region plasma waves with a high-resolution 50-MHz radar interferometer at Ithaca. During postmidnight periods of very strong magnetic activity at Ottawa (L = 3.5), the backscattered power and Doppler spectra vary rapidly with time and range and may have both mean Doppler shifts and half power widths in excess of 200 Hz (600 m/s). In addition, when the radar and magnetometer data imply that the current is approximately parallel to the radar line of sight, sharp spectral peaks corresponding to phase velocities approaching 1 km/s sometimes appear suddenly. These persist for at most several …

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Iupac 7th International Symposium On Cationic Polymerization And Related Processes, Otto Vogl, Dietmar Lohmann Dec 1986

Iupac 7th International Symposium On Cationic Polymerization And Related Processes, Otto Vogl, Dietmar Lohmann

Otto Vogl

No abstract provided.

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Centers Of Polymer Chemistry In Czechoslovakia 1: Institute Of Macromolecular Chemistry, Prague, Czechoslovakia, Otto Vogl, Vladimir Kubanek, Jan Sebenda Dec 1986

Centers Of Polymer Chemistry In Czechoslovakia 1: Institute Of Macromolecular Chemistry, Prague, Czechoslovakia, Otto Vogl, Vladimir Kubanek, Jan Sebenda

Otto Vogl

No abstract provided.

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Weak Decays Of The H-Dibaryon, Jf Donoghue, E Golowich, Br Holstein Nov 1986

Weak Decays Of The H-Dibaryon, Jf Donoghue, E Golowich, Br Holstein

Barry R Holstein

We calculate decay rates and branching fractions for the postulated S=-2 H dibaryon, both for the expected ΔS=1 channels (nΛ,nΣ0,pΣ-) and for the possible ΔS=2 mode (nn). For ΔS=1 decays we find the S waves are dominated by ΔI=(3/2) transitions due to the Pauli principle, which forces the six-quark final state to be in a SU(3) 27-plet. If observed, this would be the first breakdown of the ΔI=1/2 rule. The lifetime is long, of order 10-8 sec, which should be considered in planning experiments. In the ΔS=2 case, we add a consideration of dispersive effects to our previous calculation of …

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The Minimum Size Of The Aids Epidemic In The United States, Ron Brookmeyer, Mitchell Gail Nov 1986

The Minimum Size Of The Aids Epidemic In The United States, Ron Brookmeyer, Mitchell Gail

Ron Brookmeyer

A new method based on the reported incubation period of transfusion-associated AIDS was used to estimate the number of AIDS cases likely to arise in the USA among those infected before 1986. Between 1986 and 1991 102 000 new cases are projected, with a total cumulative incidence of 135 000 AIDS cases. These estimates do not account for new infections after 1985 nor very long incubation periods and are thus the smallest numbers to be expected. Even if new infections can be effectively prevented, the epidemic will be five times larger than the number of cases observed so far.

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Polymer Science And Engineering In Universities Of The People's Republic Of China: South Of The Yangtze River - Part Ii, Otto Vogl, T. Y. Yu, S. L. Yang Nov 1986

Polymer Science And Engineering In Universities Of The People's Republic Of China: South Of The Yangtze River - Part Ii, Otto Vogl, T. Y. Yu, S. L. Yang

Otto Vogl

No abstract provided.

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Second U.S.-Sweden Workshop On Photochemistry Of Polymers, Otto Vogl, Ann Christine Albertsson, Bengt Ranby Nov 1986

Second U.S.-Sweden Workshop On Photochemistry Of Polymers, Otto Vogl, Ann Christine Albertsson, Bengt Ranby

Otto Vogl

No abstract provided.

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Polymer Science At Universities Of The German Democratic Republic, Otto Vogl, Margit T. Raetzsch, Werner Berger, Guenther Heublein, Joachim Ulbricht Oct 1986

Polymer Science At Universities Of The German Democratic Republic, Otto Vogl, Margit T. Raetzsch, Werner Berger, Guenther Heublein, Joachim Ulbricht

Otto Vogl

No abstract provided.

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Vth International Congress Aplichem "85 International Chemistry Fair, Incheba, 1985, In Bratislava, Otto Vogl, Michal Ilavski, Eberhard Borsig Oct 1986

Vth International Congress Aplichem "85 International Chemistry Fair, Incheba, 1985, In Bratislava, Otto Vogl, Michal Ilavski, Eberhard Borsig

Otto Vogl

No abstract provided.

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University Of London Expedition To Madagascar Report, Nat Quansah Sep 1986

University Of London Expedition To Madagascar Report, Nat Quansah

Nat Quansah

No abstract provided.

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Scaling All Correlation Energy In Perturbation Theory Calculations Of Bond Energies And Barrier Heights, Mark S. Gordon, Donald G. Truhlar Sep 1986

Scaling All Correlation Energy In Perturbation Theory Calculations Of Bond Energies And Barrier Heights, Mark S. Gordon, Donald G. Truhlar

Mark S. Gordon

We present and test a new method for scaling all correlation energy as estimated by M0ller-Plesset many-body perturbation theory with popular basis sets. Scale factors that may be useful for future applications are estimated from known bond dissociation energies. We also use scale factors to estimate the barrier heights for two hydrogen-transfer reactions, CH3 + H2 = CH4 + H and OH + CH4 = H20 + CH3•

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Makromolekulares Kolloquium Freiburg, Otto Vogl, Hans-Joachim Cantow Sep 1986

Makromolekulares Kolloquium Freiburg, Otto Vogl, Hans-Joachim Cantow

Otto Vogl

No abstract provided.

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Gravitational Coupling At Finite Temperature, Jf Donoghue, Br Holstein, Rw Robinett Aug 1986

Gravitational Coupling At Finite Temperature, Jf Donoghue, Br Holstein, Rw Robinett

Barry R Holstein

We discuss a thermodynamic identity which helps explain why ≠ at finite temperature. In addition we complete the discussion of the gravitational force by including the gravitational variation of the temperature. Gradients in the temperature induce extra forces not accounted for by the usual coupling to the energy-momentum tensor.

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Iupac Polymer Chemistry Meeting, Leuven, Belgium, Otto Vogl, Marcel Van Beylen, Frans C. Deschryver Aug 1986

Iupac Polymer Chemistry Meeting, Leuven, Belgium, Otto Vogl, Marcel Van Beylen, Frans C. Deschryver

Otto Vogl

No abstract provided.

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A Refined Model For The Space-Charge Layer In Composite Electrolyte Systems, Michael Setter Jul 1986

A Refined Model For The Space-Charge Layer In Composite Electrolyte Systems, Michael Setter

Michael P. Setter

No abstract provided.

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Japan-U.S. Polymer Symposium, Kyoto, Japan 1985, Jane C. Vogl, T. Takahiko Jul 1986

Japan-U.S. Polymer Symposium, Kyoto, Japan 1985, Jane C. Vogl, T. Takahiko

Otto Vogl

No abstract provided.

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Rigid Backbone: A New Geometry For Percolation, Anthony Roy Day, R. R. Tremblay, A.-M. S. Tremblay Jun 1986

Rigid Backbone: A New Geometry For Percolation, Anthony Roy Day, R. R. Tremblay, A.-M. S. Tremblay

Anthony Roy Day

It is shown that the diluted two-dimensional central-force problem belongs to a new class of percolation problems. Geometric properties such as the fractal dimension of the backbone, the correlation-length exponent, and the connectivity are completely different from those of previously studied percolation problems. Explicit calculations of the backbone and the construction of an algorithm which identifies the infinite rigid cluster clearly demonstrate the absence of singly connected bonds, the overwhelming importance of loops, and the long-range nature of the rigidity.

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