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Articles 2311 - 2340 of 2377

Full-Text Articles in Physical Sciences and Mathematics

The Adiabatic Theorem And Berry's Phase, Br Holstein Dec 1988

The Adiabatic Theorem And Berry's Phase, Br Holstein

Barry R Holstein

A study is presented of Berry's observation that when a quantum-mechanical system is transported on a closed adiabatic journey, a topological phase arises in addition to the usual dynamical phase expected from the adiabatic theorem. Consequences are explored in the case of a simple magnetic moment-magnetic field interaction and are shown to lead, among other things, to Dirac's famous relation between electric and magnetic charges.

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Random Elastic Networks, Anthony Day, M. Thorpe, W. Xia Dec 1988

Random Elastic Networks, Anthony Day, M. Thorpe, W. Xia

Anthony Roy Day

Proceedings of the International Workshop on Condensed Matter Theories, 1988.

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Spectral Continuity In Complex Interpolation, Karen Saxe, D. Herrero Dec 1988

Spectral Continuity In Complex Interpolation, Karen Saxe, D. Herrero

Karen Saxe

No abstract provided.

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Surface-Enhanced Raman Study: Effect Of Ph And Electrode Potential On The Interfacial Behavior Of Some Substituted Pyridines, Mark Anderson, Daniel Evans Nov 1988

Surface-Enhanced Raman Study: Effect Of Ph And Electrode Potential On The Interfacial Behavior Of Some Substituted Pyridines, Mark Anderson, Daniel Evans

Mark R. Anderson

The surface-enhanced Raman spectra (SERS) provide information about the extent of protonation of the species adsorbed at the silver/aqueous solution interface. The compounds investigated were 4-pyridylcarbinol (1), 4-acetylpyridine (2), 3-pyridinecarboxaldehyde (3), isonicotinic acid (4), isonicotinamide (5), 4-benzoylpyridine (6), 4-(aminomethyl)pyridine (7) and 4-aminopyridine (8). For 1, the fraction of the adsorbed species which was protonated at -0.20 V vs. SCE varied with pH in a manner indicating stronger adsorption of the neutral than the cationic form. The fraction protonated increased at more negative potentials. Similar results were obtained with 3. For all compounds but 4, bands due to the unprotonated species …

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Constraints On Left-Right-Symmetric Models From Neutron Decay, As Carnoy, J Deutsch, Br Holstein Aug 1988

Constraints On Left-Right-Symmetric Models From Neutron Decay, As Carnoy, J Deutsch, Br Holstein

Barry R Holstein

The implications for left-right-symmetric models of recent neutron-β-decay asymmetry and lifetime measurements are analyzed. The significance of forthcoming high-precision lifetime measurements is stressed.

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The Effect Of Solvent Type On The Infrared Spectrum Of Carbon Monoxide Adsorbed On A Platinum Electrode, Stanley Pons, Mark Anderson, Daniel Blackwood Aug 1988

The Effect Of Solvent Type On The Infrared Spectrum Of Carbon Monoxide Adsorbed On A Platinum Electrode, Stanley Pons, Mark Anderson, Daniel Blackwood

Mark R. Anderson

No abstract is currently available.

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"The Infrared Spectra Of Carbon Monoxide Adsorbed On A Polycrystalline Platinum Electrode From Nonaqueous Solutions, Mark Anderson, Daniel Blackwood, Stanley Pons Jun 1988

"The Infrared Spectra Of Carbon Monoxide Adsorbed On A Polycrystalline Platinum Electrode From Nonaqueous Solutions, Mark Anderson, Daniel Blackwood, Stanley Pons

Mark R. Anderson

No abstract is currently available.

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Gauge-Invariance And Quantization, Br Holstein Dec 1987

Gauge-Invariance And Quantization, Br Holstein

Barry R Holstein

Quantizing theories such as quantum electrodynamics that contain a gauge invariance are discussed via a simple pedagogical example. Canonical and path integral quantization methods are compared.

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On A General Class Of Multivariate Linear Smoothing Operators, Tian-Xiao He Dec 1987

On A General Class Of Multivariate Linear Smoothing Operators, Tian-Xiao He

Tian-Xiao He

No abstract provided.

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Asymptotic Properties Of Positive Summation-Integral Operators, Tian-Xiao He Dec 1987

Asymptotic Properties Of Positive Summation-Integral Operators, Tian-Xiao He

Tian-Xiao He

No abstract provided.

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On Minimal And Quasi-Minimal Supported Bivariate Splines, Tian-Xiao He Dec 1987

On Minimal And Quasi-Minimal Supported Bivariate Splines, Tian-Xiao He

Tian-Xiao He

No abstract provided.

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Semiclassical Treatment Of The Double Well, Br Holstein Dec 1987

Semiclassical Treatment Of The Double Well, Br Holstein

Barry R Holstein

The double well potential V(x)= 1/4 λ(x2-α2)2 is addressed using both semiclassical path integral and instanton techniques. The basic physics of the two-state system is shown to arise, and energy levels calculated via the two methods are compared.

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Surface-Enhanced Raman Study Of The Effect Of Ph And Electrode Potential On The Surface Concentrations Of The Electroactive Forms Of Pyridinecarboxaldehydes, Dennis Evans, Mark Anderson Aug 1987

Surface-Enhanced Raman Study Of The Effect Of Ph And Electrode Potential On The Surface Concentrations Of The Electroactive Forms Of Pyridinecarboxaldehydes, Dennis Evans, Mark Anderson

Mark R. Anderson

No abstract is currently available.

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Cp Violation In K-]3-Pi, Jf Donoghue, Br Holstein, G Valencia Jul 1987

Cp Violation In K-]3-Pi, Jf Donoghue, Br Holstein, G Valencia

Barry R Holstein

No abstract provided.

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The Systematic Design Of A Composite Electrolyte, Michael Setter, J. Wagner Jul 1987

The Systematic Design Of A Composite Electrolyte, Michael Setter, J. Wagner

Michael P. Setter

No abstract provided.

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Kobayashi-Maskawa Angles And Su(3) Breaking In Hyperon Beta-Decay, Jf Donoghue, Br Holstein, Sw Klimt Jan 1987

Kobayashi-Maskawa Angles And Su(3) Breaking In Hyperon Beta-Decay, Jf Donoghue, Br Holstein, Sw Klimt

Barry R Holstein

The determination of the Kobayashi-Maskawa matrix element Vus from hyperon β decays has long had a hidden uncertainty due to the almost universal assumption of SU(3) invariance in Cabibbo-type fits, especially since the data definitely indicate the presence of SU(3) breaking. We have reanalyzed the hyperon-decay data using the pattern of symmetry breaking predicted by the quark model including the center-of-mass correction. We find that the SU(3)-broken picture is far superior to the assumption of perfect SU(3), and provides a good fit to experiment. The sensitivity of Vus to the breaking is not large and we find Vus=0.220+/-0.001+/-0.003 (the errors …

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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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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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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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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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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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Chiral Symmetry, Nonleptonic Hyperon Decay, And The Feinberg-Kabir-Weinberg Theorem, Jf Donoghue, Br Holstein Apr 1986

Chiral Symmetry, Nonleptonic Hyperon Decay, And The Feinberg-Kabir-Weinberg Theorem, Jf Donoghue, Br Holstein

Barry R Holstein

We demonstrate that additional (kaon-pole) diagrams must be appended to the traditional commutator-plus-baryon-pole approach to nonleptonic hyperon decay. The modified analysis satisfied the constraints of the Feinberg-Kabir-Weinberg theorem. The new terms are not numerically significant in the case of the usual current-current Hamiltonian, in the continuum limit, but can be important for work using lattice techniques or for other Hamiltonians.

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A Prescription For Computer System Excellence, Robert Yacobellis Dec 1985

A Prescription For Computer System Excellence, Robert Yacobellis

Robert H Yacobellis

No abstract provided.

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