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Articles 1921 - 1942 of 1942
Full-Text Articles in Physical Sciences and Mathematics
Electron-Phonon Interaction In Impure Cadmium, Paul D. Hambourger
Electron-Phonon Interaction In Impure Cadmium, Paul D. Hambourger
Physics Faculty Publications
No abstract provided.
Karate Strikes, Jearl D. Walker
Karate Strikes, Jearl D. Walker
Physics Faculty Publications
Analysis of a forward karate punch is made as an example of collision mechanics. The energy lost to deformation of an opponent is evaluated, and the deformation is shown to be maximized if contact is made when the fist has the greatest speed. In karate fighting the maximum deformation is obtained by focusing a punch to terminate several centimeters inside an opponent’s body. The average impact force is calculated and compared with that neeeded to break a human bone by stressing it beyond its ultimate bending stress value. Similar breaking forces needed for bricks and wooden boards are also computed. …
Temperature Dependence Of Magnetoresistance In Ni3al System, Paul D. Hambourger, R. J. Olwert, C. W. Chu
Temperature Dependence Of Magnetoresistance In Ni3al System, Paul D. Hambourger, R. J. Olwert, C. W. Chu
Physics Faculty Publications
The transverse magnetoresistance of stoichiometric and off-stoichiometric polycrystalline samples of the Ni3Al system has been measured over the temperature range 1.2C. The data are in qualitative agreement with the theoretical predictions of Chang et al. based on a model of the magnetoresistance of an itinerant ferromagnet, but the observed magnetoresistance is considerably larger than predicted.
Double Rainbow And Dark Band In Searchlight Beam, J. Harsch, Jearl D. Walker
Double Rainbow And Dark Band In Searchlight Beam, J. Harsch, Jearl D. Walker
Physics Faculty Publications
No abstract provided.
Ohmic Contacts To Al‐Implanted Znse, B. K. Shin, David C. Look, Y. S. Park
Ohmic Contacts To Al‐Implanted Znse, B. K. Shin, David C. Look, Y. S. Park
Physics Faculty Publications
No abstract provided.
Temperature-Dependence Of Electron Mean Free Paths In Tungsten, Paul D. Hambourger
Temperature-Dependence Of Electron Mean Free Paths In Tungsten, Paul D. Hambourger
Physics Faculty Publications
No abstract provided.
Electrical Characteristics Of Al‐Implanted Znse, B. K. Shin, Y. S. Park, David C. Look
Electrical Characteristics Of Al‐Implanted Znse, B. K. Shin, Y. S. Park, David C. Look
Physics Faculty Publications
Aluminum was implanted in ZnSe at 90 keV to a dose of 1015 ions/cm2 at room temperature. Hall‐effect and sheet‐resistivity measurements were made on the samples for various annealing conditions. The implanted layer is found to be degenerate n‐type having a sheet resistivity of ∼103 Ω/□, after annealing at 900°C for 4 h.
High-Temperature Annealing In Electron-Irradiated Cds, David C. Look
High-Temperature Annealing In Electron-Irradiated Cds, David C. Look
Physics Faculty Publications
The room‐temperature irradiation of as‐grown n‐type CdS by 1‐MeV electrons results in an increase in carrier concentration. The damage anneals in the temperature range 250–300°C, and a study of the annealing kinetics reveals an activation energy of about 1.3 eV which is attributed to sulfur‐vacancy motion.
Self‐Focusing Of Laser Light In The Isotropic Phase Of A Nematic Liquid Crystal, D.V.G.L.N. Rao, S. Jayaraman
Self‐Focusing Of Laser Light In The Isotropic Phase Of A Nematic Liquid Crystal, D.V.G.L.N. Rao, S. Jayaraman
Physics Faculty Publications
Self‐focusing of ruby laser light is studied as a function of sample length and temperature in the isotropic phase of nematic liquid‐crystal MBBA. The critical power for self‐focusing, 0.36 kW, observed near the phase transition temperature is a factor of 20 times less than that for CS2. The corresponding nonlinear index 4.4 × 10−10 esu is the largest value known so far for any material.
Proton-Scattering On (29)Si In Range Ep = 2.5-3.4 Mev*, Joseph W. Hemsky, S. C. Ling, Paul J. Wolfe
Proton-Scattering On (29)Si In Range Ep = 2.5-3.4 Mev*, Joseph W. Hemsky, S. C. Ling, Paul J. Wolfe
Physics Faculty Publications
Elastic and inelastic proton scattering measurements on Elastic and inelastic proton scattering measurements on 29Si have been obtained in the energy range Ep = 2.5-3.4 MeV. 30 elastic and 32 inelastic resonances were observed. 14 prominent resonances from elastic scattering were analyzed. Results of the analysis for proton orbital momenta, spin and parity assignments, and proton partial widths are given. The inelastic resonance strengths measured relative to the known strength of the 1302-keV resonance in 29Si(p,y)30P are also reported.
The Howard University Reviews Of Science, Vol 1 No 3, Department Of Physics
The Howard University Reviews Of Science, Vol 1 No 3, Department Of Physics
Physics Faculty Publications
No abstract provided.
Nuclear-Magnetic-Resonance Study Of Co2+ In Cds, David C. Look, Donald R. Locker
Nuclear-Magnetic-Resonance Study Of Co2+ In Cds, David C. Look, Donald R. Locker
Physics Faculty Publications
Nuclear spin-lattice relaxation times, T1, have been measured over a temperature range T=(1.1-300) °K and frequency range ν=2-15 MHz in a single crystal of CdS doped with 13-ppm cobalt. Minima in T1 vs T are observed, and absolute values of the effective electron relaxation time, τe, may be calculated at the temperatures of the minima, e.g., at 14 °K, τe=8.0×10-8 sec. At low temperatures, T≲5 °K, τe is dominated by a resonant Orbach process involving the two ground-state Kramers doublets (S=±3/2 and S=±1/2) which, according to our measurements, are split by …
Nuclear-Magnetic-Resonance Measurement Of The Conduction-Electron G Factor In Cdte, David C. Look, D. L. Moore
Nuclear-Magnetic-Resonance Measurement Of The Conduction-Electron G Factor In Cdte, David C. Look, D. L. Moore
Physics Faculty Publications
The effective g factor g* of conduction electrons in degenerate CdTe has been determined by using measurements of the Cd113 nuclear spin-lattice relaxation time T1 and the Knight shift K. It is shown that the magnitude of g* is given by the Korringa product T1TK2=C(g*)2, where C is a known constant and T is the absolute temperature, and that the sign of g* is given by the sign of K for a spherically symmetric conduction band. The measured value, g*=-1.1±0.1, is within the range allowed …
The Howard University Reviews Of Science, Vol 1 No 2, Department Of Physics
The Howard University Reviews Of Science, Vol 1 No 2, Department Of Physics
Physics Faculty Publications
No abstract provided.
The Howard University Reviews Of Science, Vol 1 No 1, Department Of Physics
The Howard University Reviews Of Science, Vol 1 No 1, Department Of Physics
Physics Faculty Publications
No abstract provided.
Nuclear-Magnetic-Resonance Studies Of The Semiconductor-To-Metal Transition In Chlorine-Doped Cadmium Sulfide, Frank D. Adams, David C. Look, Carlton L. Brown, Donald R. Locker
Nuclear-Magnetic-Resonance Studies Of The Semiconductor-To-Metal Transition In Chlorine-Doped Cadmium Sulfide, Frank D. Adams, David C. Look, Carlton L. Brown, Donald R. Locker
Physics Faculty Publications
Spin-lattice relaxation times (T1) and Knight shifts were measured for Cd113 nuclei in 12 CdS crystals doped with various amounts of chlorine. Hall coefficients were measured in order to estimate conduction-electron concentrations. Data were obtained for all samples at 300 °K and for some highly doped samples at 77, 4.2, and 2.13 °K. Metallic properties were observed in all samples having electron concentrations n>2×1018 cm-3. At 300 °K, we find 1/T1∝n for nonmetallic samples and 1/T1∝n2/3 when samples are metallic. The latter proportionality continues to hold at lower …
Nuclear Magnetic Resonance Investigation Of The Metal-To-Semiconductor Transition In Crystalline Cdo, R. P. Benedict, David C. Look
Nuclear Magnetic Resonance Investigation Of The Metal-To-Semiconductor Transition In Crystalline Cdo, R. P. Benedict, David C. Look
Physics Faculty Publications
Measurements of the Cd113 nuclear-spin-lattice relaxation time (T1) and resonance frequency shift (K) were carried out in several samples of polycrystalline n-type CdO over the temperature (T) range 1.4-300°K, frequency (ν) range 2-10 MHz, and carrier concentration (Ne) range 3.3-44×1018 cm-3. For Ne>1019 cm-3, we find that T1∝Ne-2/3T-1 and K∝Ne1/3, showing that the nuclei are interacting with degenerate conduction electrons. Furthermore, the Korringa relationship holds and the calculated electron density at a nucleus is almost the same as …
Time Saving In Measurement Of Nmr And Epr Relaxation Times, David C. Look, Donald R. Locker
Time Saving In Measurement Of Nmr And Epr Relaxation Times, David C. Look, Donald R. Locker
Physics Faculty Publications
By producing a train of absorption or dispersion signals (continuous‐wave magnetic resonance) or free induction decays (pulsed magnetic resonance) it is possible to save time in spin‐lattice relaxation measurements due to the fact that it is not necessary to wait for equilibrium magnetization before initiating the train. The relaxation time may be calculated from the train according to a simple rapidly converging iteration.
Nmr Determination Of The Conduction-Electron Hyperfine Interaction In Crystalline Cdo, David C. Look
Nmr Determination Of The Conduction-Electron Hyperfine Interaction In Crystalline Cdo, David C. Look
Physics Faculty Publications
Measurements of the Cd113 nuclear-spin-lattice relaxation time T1 and Hall effect in crystalline CdO, a degenerate semiconductor, have yielded the contact hyperfine strength of the conduction electrons at the nuclei. The product T1T=168 sec °K, independent of temperature T and frequency ν for T=1.4,4.2, and 77-350 °K, and for ν=2-10 MHz. Taking the carrier concentration N=2.6×1019 cm-3 independent of temperature to within 3% at 4.2, 77, and 300°K, and using an effective electron mass me*=0.2me, we calculate an averaged electron probability density at the nucleus, 〈|φF(0)|2 …
Pulsed Nmr By Tone-Burst Generation, David C. Look, Donald R. Locker
Pulsed Nmr By Tone-Burst Generation, David C. Look, Donald R. Locker
Physics Faculty Publications
No abstract provided.
Measurement Of Electron Spin-Lattice Relaxation Times Using Ordinary Epr Spectrometers, David C. Look, Donald R. Locker
Measurement Of Electron Spin-Lattice Relaxation Times Using Ordinary Epr Spectrometers, David C. Look, Donald R. Locker
Physics Faculty Publications
No abstract provided.
Nuclear Spin-Lattice Relaxation Measurements By Tone-Burst Modulation, David C. Look, Donald R. Locker
Nuclear Spin-Lattice Relaxation Measurements By Tone-Burst Modulation, David C. Look, Donald R. Locker
Physics Faculty Publications
No abstract provided.