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Articles 61 - 76 of 76
Full-Text Articles in Physics
A Statistical Study Of Transient Event Motion At Geosynchronous Orbit, Jeff Sanny, David Berube, D. G. Sibeck
A Statistical Study Of Transient Event Motion At Geosynchronous Orbit, Jeff Sanny, David Berube, D. G. Sibeck
Physics Faculty Works
The geosynchronous GOES 5 and GOES 6 satellites frequently observe transient events marked by magnetic field strength increases and bipolar magnetic field signatures lasting several minutes. In this study we report a survey of 87 events observed simultaneously by both GOES spacecraft (for a total of 174 individual observations) from August to December 1984. Events detected in the prenoon sector outnumbered those in the postnoon sector by about a 3 to 1 ratio. The distribution of the events versus local time exhibited a significant prenoon peak like the distribution of magnetic impulse events observed in high-latitude ground magnetometers. A cross-correlation …
Measurement Of The Gluon Parton Distribution Function At Small X With Neutrino Telescopes, Gabriele U. Varieschi
Measurement Of The Gluon Parton Distribution Function At Small X With Neutrino Telescopes, Gabriele U. Varieschi
Physics Faculty Works
We analyze the possibility that neutrino telescopes may provide an experimental determination of the slope λ of the gluon distribution in the proton at momentum fractions x smaller than the accelerator reach. The method is based on a linear relation between λ and the spectral index ~slope! of the down-going atmospheric muon flux above 100 TeV, for which there is no background. Considering the uncertainties in the charm production cross section and in the cosmic ray composition, we estimate the error on the measurement of l through this method, excluding the experimental error of the telescopes, to be ±0.2.
Prompt Atmospheric Neutrinos And Muons: Dependence On The Gluon Distribution Function, Gabriele U. Varieschi
Prompt Atmospheric Neutrinos And Muons: Dependence On The Gluon Distribution Function, Gabriele U. Varieschi
Physics Faculty Works
No abstract provided.
Perturbative Quantum Chromodynamics Predictions For Very High Energy Atmospheric Neutrinos And Muons, Gabriele U. Varieschi
Perturbative Quantum Chromodynamics Predictions For Very High Energy Atmospheric Neutrinos And Muons, Gabriele U. Varieschi
Physics Faculty Works
We compare the leading and next-to-leading order Quantum Chromodynamics predictions for the flux of atmospheric muons and neutrinos from decays of charmed particles. We then compute this flux for different Partonic Distribution Functions (PDF's) and different extrapolations of these at small partonic momentum fraction x. We find that the predicted fluxes vary up to almost two orders of magnitude at the largest energies studied, depending on the chosen extrapolation of the PDF's. We show that the spectral index of the atmospheric leptonic fluxes depends linearly on the slope of the gluon distribution function at very small x. Finally, we analyze …
Prompt Atmospheric Neutrinos And Muons: Nlo Versus Lo Qcd Predictions, Gabriele U. Varieschi
Prompt Atmospheric Neutrinos And Muons: Nlo Versus Lo Qcd Predictions, Gabriele U. Varieschi
Physics Faculty Works
No abstract provided.
Measuring The Diameter Of Your Blind Spot, Jeff Sanny
Measuring The Diameter Of Your Blind Spot, Jeff Sanny
Physics Faculty Works
A simple experiment to determine the diameter of the blind spot is described. Students are divided into groups of three and work together to perform the experiment. The procedure takes about 15 minutes and seems to be quite enjoyable to the class.
Mach’S Principle In A Mixed Newton-Einstein Context, Evert Jan Post, Michael Berg
Mach’S Principle In A Mixed Newton-Einstein Context, Evert Jan Post, Michael Berg
Mathematics Faculty Works
A closed physical space, in conjunction with scalar versus pseudo scalar distinctions, and an accordingly adapted Gauss theorem, reveal unexpected perspectives on Mach's principle, the mass-energy theorem, and a bonus insight into the nature of the solutions of the Einstein field equations of gravity.
A Statistical Study Of The Magnetic Signatures Of Ftes Near The Dayside Magnetopause, Jeff Sanny, C. Beck, D. G. Sibeck
A Statistical Study Of The Magnetic Signatures Of Ftes Near The Dayside Magnetopause, Jeff Sanny, C. Beck, D. G. Sibeck
Physics Faculty Works
During magnetopause crossings, the AMPTE CCE satellite frequently observed flux transfer events (FTEs) characterized by fluctuations in the magnetic field strength (B) and bipolar signatures in the field component (BN) normal to the nominal magnetopause. In this study, we survey 110 events observed from October to December 1984 and during January 1986. Nearly all events exhibited increases in B, and although the majority of events exhibited a symmetric bipolar signature in BN, a significant number (31 of 110) had asymmetric bipolar signatures in which the trailing pulse was dominant. Most of the …
A Statistical Study Of Transient Events In The Outer Dayside Magnetosphere, Jeff Sanny, D. G. Sibeck, C. C. Venturini, C. T. Russell
A Statistical Study Of Transient Events In The Outer Dayside Magnetosphere, Jeff Sanny, D. G. Sibeck, C. C. Venturini, C. T. Russell
Physics Faculty Works
The AMPTE CCE satellite frequently observed transient (1 ≤ τ ≤ 8 min) events marked by magnetic field strength increases and bipolar magnetic field signatures (peak-to-peak amplitudes ≥ 4 nT) while in the outer dayside magnetosphere. We report a survey of 59 prominant events observed from August to November 1984. The bipolar signatures and minimum variance analysis reveal that most events move poleward and antisunward, except in the immediate vicinity of local noon. Here the motion of the events appears to be better governed by the spiral/orthospiral interplanetary magnetic field (IMF) orientation than magnetic curvature forces associated with IMF By. …
A Simple Description Of Coherence, William Moebs, Jeff Sanny
A Simple Description Of Coherence, William Moebs, Jeff Sanny
Physics Faculty Works
No abstract provided.
Measurement Of The Microwave Dielectric Constant For Low‐Loss Samples With Finite Thickness Using Open‐Ended Coaxial‐Line Probes, G. Q. Jiang, W. H. Wong, E. Y. Raskovich, W. G. Clark, W. A. Hines, Jeff Sanny
Measurement Of The Microwave Dielectric Constant For Low‐Loss Samples With Finite Thickness Using Open‐Ended Coaxial‐Line Probes, G. Q. Jiang, W. H. Wong, E. Y. Raskovich, W. G. Clark, W. A. Hines, Jeff Sanny
Physics Faculty Works
This work addresses the effect of finite sample thickness on microwave dielectric constant measurements for thin, planar, low-loss samples using the open-ended coaxial-line probe method. Detailed measurements of the dielectric constant were carried out on a wide range of thicknesses of air samples which were backed by infinitely thick teflon and alumina dielectric media. The measurements were made at room temperature for various (50 Ω) coaxial-line dimensions, microwave frequencies 4-8 GHz, and power levels near a fraction of a mW. The results provide strong support for previously published theoretical calculations based on a boundary value problem which uses a spectral …
Low-Temperature Magnetic Properties Of Submetallic Phosphorous-Doped Silicon, C. T. Murayama, W. G. Clark, Jeff Sanny
Low-Temperature Magnetic Properties Of Submetallic Phosphorous-Doped Silicon, C. T. Murayama, W. G. Clark, Jeff Sanny
Physics Faculty Works
Measurements of the electron-spin-resonance properties of Si:P with dopant concentration of n=2.05×1018 cm−3 (somewhat below the metal-insulating transition) at low temperatures (0.035 to 4.2 K) and low frequencies (11.5-58.2 MHz) are reported. They show a substantial deviation from Curie-law behavior for the susceptibility, in agreement with previous static experiments. An internal field is observed to develop as the temperature is lowered. At 35 mK, the internal field has a magnitude of 2.1 Oe and is directed opposite to the externally applied field. The buildup of the internal field is accompanied by an increase in the resonance linewidth. Both …
Frequency-Dependent Conductivity In Nbse3, G. Gruner, L. C. Tippie, Jeff Sanny, W. G. Clark, N. P. Ong
Frequency-Dependent Conductivity In Nbse3, G. Gruner, L. C. Tippie, Jeff Sanny, W. G. Clark, N. P. Ong
Physics Faculty Works
The observation of a frequency-dependent conductivity (σ) and dielectric constant (ε) in NbSe3 is reported. In both charge-density-wave phases a strong frequency dependence and huge dielectric constant are observed below 100 MHz, with greatest effects observed at 42 K. The conductivity σ increases smoothly from the dc value to the high-frequency (f=100 MHz) limit; this increase is accompanied by the reduction of ε. A resistance-capacitance network model is suggested to account for the observed frequency dependence.
Disordered Magnetic Chain Behavior Of Quinolinium (Tcnq)2 And Related Materials At Low Temperatures, Jeff Sanny
Disordered Magnetic Chain Behavior Of Quinolinium (Tcnq)2 And Related Materials At Low Temperatures, Jeff Sanny
Physics Faculty Works
No abstract provided.
Esr And Spin-Lattice Relaxation Of Nd3+ In A Metallic Host: Larh2, S. A, Dodds, Jeff Sanny, R. Orbach
Esr And Spin-Lattice Relaxation Of Nd3+ In A Metallic Host: Larh2, S. A, Dodds, Jeff Sanny, R. Orbach
Physics Faculty Works
We report the first ESR observation of Nd3+ in a metal: cubic LaRh2. The resonance arises from a Γ6 ground state and exhibits hyperfine splitting at low temperature, allowing for positive identification. Above about 12 K, the ESR linewidth increases exponentially with temperature. We attribute this increase to the resonance phonon relaxation process involving the first excited state at 125±10 K.
Measurements Of Orbit-Lattice Coupling Of Er And Dy Impurities In Ag And Al Hosts, S. A. Dodds, Jeff Sanny
Measurements Of Orbit-Lattice Coupling Of Er And Dy Impurities In Ag And Al Hosts, S. A. Dodds, Jeff Sanny
Physics Faculty Works
The magnetic resonance of dilute Dy and Er impurities has been observed in thin polycrystalline Al and Ag films on two different substrates. The films are deposited at room temperature, and the measurements are made at liquid-helium temperatures. During cooling, the difference in thermal contraction between film and substrate produces an effectively uniaxial strain in the film. This results in an anisotropic g value, which we have used to obtain lower limits on the orbit-lattice coupling coefficient for these systems. We find values for V ( Γ 3g, 2 ) from 600 to 2000 cm − 1 , somewhat …