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Bedilov, M.R.; Khajdarov, R.T.; Kumishev, U.S.
Abstracts of the second Uzbekistan conference on modern problems of nuclear physics1997
Abstracts of the second Uzbekistan conference on modern problems of nuclear physics1997
AbstractAbstract
[en] The study of multicharged plasma production from aluminium target in dependence on frequency of pulsed-periodical laser was made and charge and mass spectra of ions were measured. The processes causing the generation of highly ionized plasma with laser frequency growth are discussed. (A.A.D.)
Original Title
Generatsiya mnogozaryadnoj plazmy pod dejstviem impul'sno-periodicheskogo izlucheniya lazera na Al
Source
Uzbekistan Academy of Sciences, Institute of Nuclear Physics, Taschkent (Uzbekistan); Samarkand State Univ., Samarkand (Uzbekistan); Tashkent State Univ., Physics Department, Tashkent (Uzbekistan); Tashkent State Univ., Inst. of Applied Physics, Tashkent (Uzbekistan); Tashkent State Univ., Nuclear Physics Department, Tashkent (Uzbekistan); 196 p; Sep 1997; p. 149; 2. Uzbekistan conference on modern problems of nuclear physics; Samarkand (Uzbekistan); 9-12 Sep 1997; 4 refs.
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Holzer, L.; Wenzl, F. P.; Tasch, S.; Leising, G.; Winkler, B.; Dai, L.; Mau, A. W. H.
48. annual symposium of the Austrian Physical Society1998
48. annual symposium of the Austrian Physical Society1998
AbstractAbstract
No abstract available
Original Title
Licht emittierende elektrochemische Zellen aus neuartigen Polymeren mit geringen Ansprechzeiten
Source
Netzer, F.P. (ed.) (Inst. f. Experimentalphysik, K.-F.-Univ. Graz, 8010 Graz (Austria)); Oesterreichische Physikalische Gesellschaft, Vienna (Austria); 204 p; 1998; p. 116; 48. annual symposium of the Austrian Physical Society; 48. Jahrestagung der Oesterreichischen Physikalischen Gesellschaft; Graz (Austria); 14-18 Sep 1998
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AbstractAbstract
No abstract available
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Netzer, F.P. (ed.) (Inst. f. Experimentalphysik, K.-F.-Univ. Graz, 8010 Graz (Austria)); Oesterreichische Physikalische Gesellschaft, Vienna (Austria); 204 p; 1998; p. 126; 48. annual symposium of the Austrian Physical Society; 48. Jahrestagung der Oesterreichischen Physikalischen Gesellschaft; Graz (Austria); 14-18 Sep 1998
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Bhattacharyya, D.; Das, N.C.
Bhabha Atomic Research Centre, Mumbai (India)1998
Bhabha Atomic Research Centre, Mumbai (India)1998
AbstractAbstract
[en] A wide variety of thin film coatings, deposited by different techniques and with potential applications in various important areas, have been characterised by the Phase Modulated Spectroscopic Ellipsometer, installed recently in the Spectroscopy Division, B.A.R.C. The Phase Modulated technique provides a faster and more accurate data acquisition process than the conventional ellipsometry. The measured Ellipsometry spectra are fitted with theoretical spectra generated assuming an appropriate model regarding the sample. The fittings have been done objectively by minimising the squared difference (χ2) between the measured and calculated values of the ellipsometric parameters and thus accurate information have been derived regarding the thickness and optical constants (viz, the refractive index and extinction coefficient) of the different layers, the surface roughness and the inhomogeneities present in the layers. Measurements have been done on (i) ion-implanted Si-wafers to investigate the formation of SiC layers, (ii) phenyl- silane coating on glass to investigate the surface modifications achieved for better adsorption of rhodamine dye on glass, (iii) GaN films on quartz to investigate the formation of high quality GaN layers by sputtering of GaAs targets, (iv) Diamond-like-coating (DLC) samples prepared by Chemical Vapour Deposition (CVD) to investigate the optical properties which would ultimately lead to an accurate estimation of the ratio of sp3 and sp2 bonded carbon atoms in the films and (v) SS 304 under different surface treatments to investigate the growth of different passive films. (author)
Source
Jul 1998; 37 p; 38 refs., 5 figs., 6 tabs.
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ALLOYS, AUSTENITIC STEELS, CARBIDES, CARBON ADDITIONS, CARBON COMPOUNDS, CHARGED PARTICLES, CHEMICAL COATING, CHROMIUM ALLOYS, CHROMIUM-NICKEL STEELS, CORROSION RESISTANT ALLOYS, DEPOSITION, DIELECTRIC PROPERTIES, DIMENSIONS, ELECTRICAL PROPERTIES, FILMS, GALLIUM COMPOUNDS, HEAT RESISTANT MATERIALS, HEAT RESISTING ALLOYS, HIGH ALLOY STEELS, IONS, IRON ALLOYS, IRON BASE ALLOYS, MATERIALS, MEASURING METHODS, NICKEL ALLOYS, NITRIDES, NITROGEN COMPOUNDS, OPTICAL PROPERTIES, PHYSICAL PROPERTIES, PNICTIDES, SILICON COMPOUNDS, STAINLESS STEELS, STEEL-CR19NI10, STEELS, SURFACE COATING, TRANSITION ELEMENT ALLOYS
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[en] Plasma oscillations (plasmons) in solids are collective electron charge-density oscillations. They are observed, e.g., as peaks in the electromagnetic absorption spectra of thin metal films, where several types of plasmon mode occur (bulk, surface, standing, two-dimensional). Metallic plasmons typically have frequencies in the ultraviolet region, but in the epitaxial GaAlAs system, the plasmons lie in the far infrared because of the small electron effective mass and high dielectric constant of the underlying semiconductor. Plasmons are therefore of interest for possible far-IR-active devices. They may also be a limiting factor in the design of ultrasmall (nanosized) transistors and other electronic components. An understanding of the mutual plasmons of separated nanostructures is a key to prediction of van der Waals or dispersion forces, with applications ranging into chemistry and biology. In positively charged metal clusters or metal films one can prove a harmonic potential theorem. This states that, despite the Coulomb interaction between the electrons, there is a mode in which the entire electron gas, including its highly inhomogeneous edge regions, moves rigidly at the bare harmonic-well frequency. This motion has proved to be a crucial test case for approximate theories of time-dependent many body phenomena. In particular, the author has shown that this test is failed both by the usual approximations for the ∇n pressure term in hydrodynamics, and by the most sophisticated expressions for the exchange-correlation kernel fxc in time-dependent density functional theory. To rectify these failures the author has proposed modified theories
Source
Monash Univ., Clayton, VIC (Australia). Dept. of Physics; 213 p; 1996; p. 44; 20. ANZIP annual condensed matter physics meeting; Wagga Wagga, NSW (Australia); 30 Jan - 2 Feb 1996; Truncated abstract., 1 ref.
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[en] We calculate the ac dielectric function of a model Drude metal-insulator composite, using a three-dimensional (d=3) transfer-matrix algorithm. The real part of the effective conductivity, Rege(ω), reveals (i) a Drude peak that appears only above the percolation threshold pc; and (ii) a broad spectrum of surface-plasmon resonances whose lower edge approaches zero frequency at pc. Sufficiently near pc, the dielectric function is consistent with an expected scaling form previously verified in d=2. The surface-plasmon spectrum resembles effective-medium predictions except for a weak but persistent peak near 0.4ω/ωp
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[en] Anisotropic intrasubband magnetoplasmons of an electron gas in a wide parabolic quantum well are obtained by using a method within the framework of the random-phase approximation. The symmetries and shapes of the various perturbed Hartree potentials along the confining direction at B=0 are found analytically. Anisotropy of the intrasubband modes in the presence of a longitudinal magnetic field perpendicular to the confinement direction is revealed and explained. We also make a striking prediction that a strong longitudinal magnetic field can give rise to an additional one-dimensional-like undamped intrasubband magnetoplasmon mode which is well within the experimentally accessible range
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[en] The purpose of this study is to develop calibration procedures by simulation code on the computer system instead of phantoms. Total-body potassium, mainly distributed in muscle mass, has been estimated by the Whole-body counter of the University of Tokyo. The subjects were counted with a plastic scintillation detector system for 10 minutes. It has high sensitivity, but its energy resolution is inevitably low. We used human-shaped water- and potassium-phantoms of five different sizes for calibration. There are considerable differences between physique of the subjects and shape and dimensions of phantoms. Physique varies from individual to individual and from time to time even in one individual, particularly in growth. So, we have been developing calibration procedures by the simulation. The EGS-4 simulation code was used. Countings given by the actual whole-body countings of potassium phantoms were used to evaluate the validity of the simulation code. Homogeneous potassium solution was assumed to be in the phantoms, and efficiency rates and energy spectra were assessed. Geometrical efficiency well agreed with actually observed one, which implies that the simulation procedures are able to provide reliable results. (author)
Source
Hirayama, Hideo; Namito, Yoshihito; Ban, Syuichi (eds.); National Lab. for High Energy Physics, Tsukuba, Ibaraki (Japan); 118 p; Dec 1991; p. 74-79; 1. EGS4 user's meeting in Japan; Tsukuba, Ibaraki (Japan); 22-23 Jul 1990
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BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, BODY, COMPUTER CODES, CONNECTIVE TISSUE, COUNTING TECHNIQUES, DOSIMETRY, ELECTRON CAPTURE RADIOISOTOPES, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, LIGHT NUCLEI, MOCKUP, NUCLEI, ODD-ODD NUCLEI, POTASSIUM ISOTOPES, RADIOISOTOPES, SIMULATION, STRUCTURAL MODELS, TISSUES, YEARS LIVING RADIOISOTOPES
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[en] We present an application of the current-density functional formalism to a nonuniform many-fermion system in a strong magnetic field. To this end, we construct a current-dependent local ground-state energy functional and derive self-consistent equations for the current density associated with a given density profile. We apply the formalism to the calculation of the surface properties of an electron-hole droplet and we find that the surface tension of the droplet is a rapidly increasing function of the magnetic field
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Zheng Xiangyang.
Tennessee Univ., Knoxville, TN (United States)1990
Tennessee Univ., Knoxville, TN (United States)1990
AbstractAbstract
[en] This dissertation consists of two parts covering two different topics. In the first part, Manson and Ritchie's self-energy formalism is applied to investigate the image potential for a charged particle near a solid surface. A generalization of this formalism to include high-order corrections is given. Numerical evaluation of the image potential is carried out using the complete and orthogonal basis set of Coulombic wave functions. Calculation of high-order corrections to the binding energy of electrons in image states is described. In the second part, a nonlinear mechanism of photon absorption by surface-plasmon excitation through intraband excitations facilitated by electron-ion interactions is investigated. Results indicate that this mechanism may make small corrections to the absorptance of photons at an Al metal surface. Further theoretical and experimental work in this area is indicated
Source
1990; 100 p; Univ. of Tennessee; Knoxville, TN (United States); University Microfilms, PO Box 1764, Ann Arbor, MI 48106, Order No.91-12,890; Thesis (Ph.D.).
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