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Silva, S.C. da; Ito, A.S.; Azzellini, G.
Sociedade Brasileira de Fisica, Rio de Janeiro, RJ (Brazil)1990
Sociedade Brasileira de Fisica, Rio de Janeiro, RJ (Brazil)1990
AbstractAbstract
[en] Published in summary fomr only
Original Title
Estudo do complexo porfirina/melanina por Espectroscopia Raman Ressonante
Source
1990; 1 p; 13. National Meeting on Condensed Matter Physics; Caxambu, MG (Brazil); 8-12 May 1990; Available from the Library of the Comissao Nacional de Energia Nuclear, RJ, Brazil
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Miscellaneous
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AbstractAbstract
[en] We present atomic resolution images of monatomic step edges on the KBr(001) surface imaged by dynamic force microscopy operated in the non-contact mode. Under certain experimental conditions, we observe a systematic and reversible change of the atomic contrast when the tip crosses the step. This change is attributed to the reversal of the polarity of the ionic tip under the influence of the tip-substrate interaction in the immediate vicinity of the step edge. This polarity reversal is attributed to a change in the atomic structure of the tip and is described by a transition between the two potential wells of a two-level system localized near the tip apex. The case of two monatomic steps imaged in succession is also investigated in detail. The results indicate that the two-level system associated with the reversal of the tip polarity involves the movement of a very limited number of ions on the tip
Primary Subject
Source
S0957-4484(08)62449-6; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Nanotechnology (Print); ISSN 0957-4484;
; v. 19(4); p. 045503

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Govind, Niranjan; Sushko, Peter V.; Hess, Wayne P.; Valiev, Marat; Kowalski, Karol
Pacific Northwest National Lab., Richland, WA (United States); Environmental Molecular Sciences Laboratory (United States). Funding organisation: US Department of Energy (United States)2009
Pacific Northwest National Lab., Richland, WA (United States); Environmental Molecular Sciences Laboratory (United States). Funding organisation: US Department of Energy (United States)2009
AbstractAbstract
[en] We present a study of the electronic excitations in insulating materials using an embedded- cluster method. The excited states of the embedded cluster are studied systematically using time-dependent density functional theory (TDDFT) and high-level equation-of-motion coupled cluster (EOMCC) methods. In particular, we have used EOMCC models with singles and doubles (EOMCCSD) and two approaches which account for the effect of triply excited configurations in non-iterative and iterative fashions. We present calculations of the lowest surface excitations of the well-studied potassium bromide (KBr) system and compare our results with experiment. The bulk-surface exciton shift is also calculated at the TDDFT level and compared with experiment
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PNNL-SA--63223; 29790; KP1504020; AC05-76RL01830
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Journal Article
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Akylbekov, A.T.; Baktybekov, K.S.; Kaliakparov, K.O.
Proceedings of 7.International conference 'Solid State Physics'2002
Proceedings of 7.International conference 'Solid State Physics'2002
AbstractAbstract
[en] Processes of localization and migration of Ki+Bri- interstitial dipole in KBr lattice were carried out by the computerized stimulation. Simulation was conducted by the MNDO quantum-chemical method. Clusters consist from 216 ions with accounting of relaxation of 114 ions of the defects surroundings. The computer calculation shows, that the Ki+Bri- dipole is localizing in the crystal lattice due to formation of chemical bond with ions of the neighboring surroundings. In this time the dipole can exists in two forms
Original Title
Issledovanie lokalizatsii i migratsii mehdouzel'nogo dipolya Ki+Bri- v reshetke KBr
Primary Subject
Source
Ministerstvo Obrazovaniya i Nauki Respubliki Kazakhstan, Astana (Kazakhstan); Vostochno-Kazakhstanskij Gosudarstvennyj Tekhnicheskij Univ., Ust'-Kamenogorsk (Kazakhstan); Mekhaniko-Tekhnologicheskij Inst. (Kazakhstan); 366 p; ISBN 9965-615-03-9;
; 2002; p. 57-59; 7.International conference 'Solid State Physics'; 7.Mezhdunarodnaya konferentsiya 'Fizika Tverdogo Tela'; Ust-Kamenogorsk (Kazakhstan); 4-7 Jun 2002; 8 refs., 2 figs.

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AbstractAbstract
No abstract available
Original Title
Corrente termoionica em cristais de KBr:Sr++ coloridos radiativamente; Determination of relaxation parameters
Source
32. Annual Meeting of the Brazilian Society for the Advancement of Science; Rio de Janeiro, Brazil; 6 - 12 Jul 1980; Published in summary form only.
Record Type
Journal Article
Literature Type
Conference
Journal
Ciencia e Cultura; ISSN 0009-6725;
; v. 32(7); p. 267

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AbstractAbstract
[en] We report the generation of a beam of slow (translationally cold) KBr molecules formed by exoergic reactive collisions in counterpropagating beams of K atoms and HBr molecules. The intensity of the slow beam is estimated to 4x1011 s-1 sr-1. The velocity distribution (density) peaks at 42.5 m/s corresponding to a formal temperature of 13 K. About 7% of the molecules move at velocities between 14.2 and 20 m/s and an estimated fraction of 7% is slower than 14.2 m/s
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Source
(c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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AbstractAbstract
[en] Dislocation loops of interstitial and vacancy types were observed to form in kBr foils during examinations in 100 kV transmission electron microscope. The examinations were carried out in the temperature range between +20 and -1100C. Small crystallites were also observed to grow on a surface of foils, when the foils were heavily irradiated at -1100C with electrons
Source
2. Europhysical topical conference on lattice defects in ionic crystals; Berlin, Germany, F.R; 30 Aug - 3 Sep 1976
Record Type
Journal Article
Literature Type
Conference
Journal
J. Phys. (Paris), Colloq; (no.7); p. C7.502-C7.506
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AbstractAbstract
[en] Most creep experiments on alkali halides have used single crystal specimens, and only relatively little information is available on the creep characteristics of polycrystalline materials (primarily LiF and NaCl). In addition, there is the possibility of marked differences in impurity content between the single and polycrystalline samples, which make it difficult to compare the limited data at present available. Accordingly, this paper describes a series of experiments conducted on KBr with the objective of overcoming these difficulties. The specific aims of this work were threefold. First, to conduct creep tests on KBr single crystals in <100> orientation. Second, to prepare polycrystalline samples of KBr from the same source of single crystals. Third, to conduct creep tests on the polycrystalline material for a direct comparison with the single crystal data
Primary Subject
Source
Pask, J.; Evans, A. (eds.); p. 295-305; 1981; p. 295-305; Plenum Press; New York, NY; 7. LLR/MMRD international symposium of interfaces in glass-metal systems; Berkeley, CA, USA; 28 Jul - 1 Aug 1980
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Book
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Conference
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Klein, D.M.; McKeever, S.W.S., E-mail: david.klein@okstate.edu2008
AbstractAbstract
[en] A fiber-optic dosimetry system using optically stimulated luminescence (OSL) of KBr:Eu was developed and its utility in near-real-time dosimetry has been tested under various medical radiation fields. The OSL response was observed to exhibit component-specific sensitivity changes while operating in the high-dose-rate regions of proton and gamma fields. The present paper provides a more detailed look at the relationship between thermoluminescence (TL) and OSL of KBr:Eu, and proposes a model to describe the mechanisms responsible for the sensitivity change
Primary Subject
Source
SSD15: 15. solid state dosimetry conference; Delft (Netherlands); 8-13 Jul 2007; S1350-4487(08)00033-4; Available from http://dx.doi.org/10.1016/j.radmeas.2008.01.015; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Rai, R; Pandit, Triloki; Jammal, Nabeel; Singh, A K; Singh, B K; Yadav, R P, E-mail: bksingh@bhu.ac.in2019
AbstractAbstract
[en] In this article, a fractal concept is used to evaluate the morphological features of KBr layers, deposited in a controlled vacuum environment. To the best of our knowledge, for the first time, self-affine or self similar nature of KBr film surfaces was examined by autocorrelation function. Theoretical estimations revealed that irregularity/complexity of growing KBr layers was significantly influenced by the thickness. The global interface width and lateral correlation length were monotonically decreased with increasing film thickness. On the contrary, fractal dimension and local roughness exponent, estimated by height-height correlation function, did not suggest such dependency. (paper)
Primary Subject
Source
Available from http://dx.doi.org/10.1088/2053-1591/ab5748; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Materials Research Express (Online); ISSN 2053-1591;
; v. 6(12); [10 p.]

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