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Articles 1 - 21 of 21

Full-Text Articles in Physics

Intersubband Dynamics Of Asymmetric Quantum Wells Studied By Thz `Optical Rectification', K Unterrainer, James Heyman, K Craig, B Galdrikian, M.S. Sherwin, K Campman, P.F. Hopkins, A.C. Gossard Oct 1996

Intersubband Dynamics Of Asymmetric Quantum Wells Studied By Thz `Optical Rectification', K Unterrainer, James Heyman, K Craig, B Galdrikian, M.S. Sherwin, K Campman, P.F. Hopkins, A.C. Gossard

James Heyman

No abstract provided.


Higgs Mass Bounds Separate Models Of Electroweak Symmetry Breaking, M Diaz, Tonnis Ter Veldhuis, T Weiler Oct 1996

Higgs Mass Bounds Separate Models Of Electroweak Symmetry Breaking, M Diaz, Tonnis Ter Veldhuis, T Weiler

Tonnis ter Veldhuis

No abstract provided.


The Spectral Function Of Random Resistor Networks, Anthony Day, M. Thorpe Jun 1996

The Spectral Function Of Random Resistor Networks, Anthony Day, M. Thorpe

Anthony Roy Day

The effective complex conductivity [...] of a two-component material can be conveniently expressed as an integral transformation of a spectral function. The spectral function depends only on the geometry of the material, and can be used to calculate [...] for any particular choice of component conductivities. This is a very useful feature if the component conductivities can be varied (by changing the temperature or frequency, for example) at a fixed geometry. We present a derivation of the spectral function that identifies it as a density of states. We have made direct numerical calculations of the spectral function of two-dimensional random resistor networks ...


Η Production In Peripheral Heavy-Ion Collisions, Alec Schramm, Daniel Reeves Mar 1996

Η Production In Peripheral Heavy-Ion Collisions, Alec Schramm, Daniel Reeves

Alec J Schramm

We estimate the impact parameter dependence of the production cross section for ηc and ηb mesons in peripheral heavy-ion collisions. Total and elastic γγ cross sections are calculated in an equivalent photon approximation.


Undressing A Collective Intersubband Excitation In A Quantum Well, K Craig, B Galdrikian, James Heyman, Et Al Mar 1996

Undressing A Collective Intersubband Excitation In A Quantum Well, K Craig, B Galdrikian, James Heyman, Et Al

James Heyman

No abstract provided.


Scanning Local‐Acceleration Microscopy, Nancy Burnham, A. Kulik, G. Gremaud, P. Gallo, F. Oulevey Feb 1996

Scanning Local‐Acceleration Microscopy, Nancy Burnham, A. Kulik, G. Gremaud, P. Gallo, F. Oulevey

Nancy A. Burnham

By adapting a scanning force microscope to operate at frequencies above the highest tip–sample resonance, the sensitivity of the microscope to materials’ properties is greatly enhanced. The cantilever’s behavior in response to high‐frequency excitation from a transducer underneath the sample is fundamentally different than to its low‐frequency response. In this article, the motivations, instrumentation, theory, and first results for this technique are described.


Non-Traditional Techniques In Teaching Science For General Students, Gary Lewis, Ben Golden, Gail Schiffer, Diane Willey Feb 1996

Non-Traditional Techniques In Teaching Science For General Students, Gary Lewis, Ben Golden, Gail Schiffer, Diane Willey

Gary C. Lewis

No abstract provided.


Materials’ Properties Measurements: Choosing The Optimal Scanning Probe Microscope Configuration, Nancy Burnham, G Gremaud, A Kulik, P Gallo, F Oulevey Feb 1996

Materials’ Properties Measurements: Choosing The Optimal Scanning Probe Microscope Configuration, Nancy Burnham, G Gremaud, A Kulik, P Gallo, F Oulevey

Nancy A. Burnham

Rheological models are used to represent different scanning probe microscope configurations. The solutions for their static and dynamic behavior are found and used to analyze which scanning probe microscope configuration is best for a given application. We find that modulating the sample at high frequencies results in the best microscope behavior for measuring the stiffness of rigid materials, and that by modulating the tip at low frequencies and detecting the motion of the tip itself (not its position relative to the tip holder) should be best for studying compliant materials in liquids.


The Mass Spectrum In A Model With Calculable Dynamical Supersymmetry Breaking, Tonnis Ter Veldhuis Jan 1996

The Mass Spectrum In A Model With Calculable Dynamical Supersymmetry Breaking, Tonnis Ter Veldhuis

Tonnis ter Veldhuis

No abstract provided.


Error In The Calculation Of Synchronized Spontaneous Otoacoustic Emission Frequencies Measured With The Ilo88 System, Jacek Smurzynski, Rudolf Probst Jan 1996

Error In The Calculation Of Synchronized Spontaneous Otoacoustic Emission Frequencies Measured With The Ilo88 System, Jacek Smurzynski, Rudolf Probst

Jacek Smurzynski

No abstract provided.


Gravitational Field, Sung Kyu Kim Dec 1995

Gravitational Field, Sung Kyu Kim

Sung Kyu Kim

No abstract provided.


Radical And Film Growth Kinetics In Methane Radio‐Frequency Glow Discharges, D. Dagel, C. Mallouris, James Doyle Dec 1995

Radical And Film Growth Kinetics In Methane Radio‐Frequency Glow Discharges, D. Dagel, C. Mallouris, James Doyle

James R. Doyle

No abstract provided.


Answer To Question #26. Electromagnetic Field Momentum, Br Holstein Dec 1995

Answer To Question #26. Electromagnetic Field Momentum, Br Holstein

Barry R Holstein

No abstract provided.


Teaching Introductory Physics To College Students, Dewey Dykstra Dec 1995

Teaching Introductory Physics To College Students, Dewey Dykstra

Dewey I. Dykstra

No abstract provided.


Understanding Alpha Decay, Br Holstein Dec 1995

Understanding Alpha Decay, Br Holstein

Barry R Holstein

The subject of alpha decay is an important part of a course in modern physics, as it provides a clear experimental manifestation of the phenomenon of barrier penetration. The traditional approach, based on Gamow's complex eigenvalue method, raises a number of questions which can be answered by employing the older but less well-known procedure of summing over scattering states. Additional insights are gained by examination of the alpha decay system via more contemporary path integral based techniques.


Far-Infrared Pump- Probe Measurements Of The Intersubband Lifetime In An Algaas/Gaas Coupled- Quantum Well, James Heyman, Et Al Dec 1995

Far-Infrared Pump- Probe Measurements Of The Intersubband Lifetime In An Algaas/Gaas Coupled- Quantum Well, James Heyman, Et Al

James Heyman

No abstract provided.


Systematics Of Soft Final State Interactions In B Decay, John Donoghue, E. Golowich, Alexey Petrov, J. Soares Dec 1995

Systematics Of Soft Final State Interactions In B Decay, John Donoghue, E. Golowich, Alexey Petrov, J. Soares

John Donoghue

By using very general and well established features of soft strong interactions we show, contrary to conventional expectations, that (i) soft final-state interactions (FSI) do not disappear for large mB, (ii) inelastic rescattering is expected to be the main source of soft FSI phases, and (iii) FSI which interchange charge and/or flavors are suppressed by a power of mB, but are quite likely to be significant at mB . 5 GeV. We briefly discuss the influence of these interactions on tests of CP violation and on theoretical calculations of weak decays.


Su(1,1) Algebraic Description Of One-Dimensional Potentials Within The R-Matrix Theory, Andrei Ludu Dec 1995

Su(1,1) Algebraic Description Of One-Dimensional Potentials Within The R-Matrix Theory, Andrei Ludu

Andrei Ludu

No abstract provided.


Interface Roughening In A Hydrodynamic Lattice-Gas Model With Surfactant, Francis W. Starr, S. T. Harrington, B. M. Boghosian, H. E. Stanley Dec 1995

Interface Roughening In A Hydrodynamic Lattice-Gas Model With Surfactant, Francis W. Starr, S. T. Harrington, B. M. Boghosian, H. E. Stanley

Francis Starr

No abstract provided.


Generalization Kdv Equation For Fluid Dynamics And Quantum Algebras, Andrei Ludu Dec 1995

Generalization Kdv Equation For Fluid Dynamics And Quantum Algebras, Andrei Ludu

Andrei Ludu

No abstract provided.


On The Power Counting Of Loop Diagrams In General Relativity, John Donoghue, Tibor Torma Dec 1995

On The Power Counting Of Loop Diagrams In General Relativity, John Donoghue, Tibor Torma

John Donoghue

A class of loop diagrams in general relativity appears to have a behavior which would upset the utility of the energy expansion for quantum effects. We show through the study of specific diagrams that cancellations occur which restore the expected behavior of the energy expansion. By considering the power counting in a physical gauge we show that the apparent bad behavior is a gauge artifact, and that the quantum loops enter with a well-behaved energy expansion.