Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Gravitomagnetic Barnett Effect  [PDF]
C. J. de Matos,M. Tajmar
Physics , 2000,
Abstract: Using the linearized theory of general relativity, the gravitomagnetic analogue of the Barnett effect is derived. Further theoretical and experimental investigation is recommended, due to the expected macroscopic values of the gravitomagnetic field involved in this effect, and to the constraints which would appear on quantum theories of gravity, currently under development, in case of non detection of the predicted phenomena.
The supersymmetric Pegg-Barnett oscillator  [PDF]
Jian Qi Shen
Physics , 2004, DOI: 10.1393/ncb/i2005-10054-y
Abstract: The su$(n)$ Lie algebraic structure of the Pegg-Barnett oscillator that possesses a finite-dimensional number-state space is demonstrated. The supersymmetric generalization of Pegg-Barnett oscillator is suggested. It is shown that such a supersymmetric Pegg-Barnett oscillator may have some potential applications, {\it e.g.}, the mass spectrum of the charged leptons.
Barnett Effect in Thin Magnetic Films and Nanostructures  [PDF]
Stefan Bretzel,Gerrit E. W. Bauer,Yaroslav Tserkovnyak,Arne Brataas
Physics , 2009, DOI: 10.1063/1.3232221
Abstract: The Barnett effect refers to the magnetization induced by rotation of a demagnetized ferromagnet. We describe the location and stability of stationary states in rotating nanostructures using the Landau-Lifshitz-Gilbert equation. The conditions for an experimental observation of the Barnett effect in different materials and sample geometries are discussed.
Norms, Normative Utterances, and Normative Propositions
An??lisis filos?3fico , 2006,
Abstract: it is argued that the distinction between the normative and the descriptive interpretation of norm sentences can be regarded as a distinction between two kinds of utterances. a norm or a directive has as its content a normative proposition. a normative (performative) utterance of a normative proposition in appropriate circumstances makes the proposition true, and an assertive (descriptive) utterance has as its truth-maker the norm system to which it refers. this account of norms, norm-contents, and utterances of norm sentences solves j?rgensen's problem: logical relations among norms can be defined in the usual way in terms of the truth-conditions of the normative propositions which form their content. there is no distinction between the logic of norms and the logic of normative propositions; in this respect the present account differs from carlos alchourrón and eugenio bulygin's account of the logic of normative propositions.
The Pegg-Barnett oscillator and its supersymmetric generalization  [PDF]
Jian Qi Shen
Physics , 2004,
Abstract: The oscillator algebra of Pegg-Barnett (P-B) oscillator with a finite-dimensional number-state space is investigated in this note. It is shown that the Pegg-Barnett oscillator possesses the su($n$) Lie algebraic structure. Additionally, we suggest a so-called supersymmetric P-B oscillator and discuss the related topics such as the algebraic structure and particle occupation number of supersymmetric P-B oscillator.
Level of flexibility through sit and reach test from research performed in S o Paulo city
Cibele Calvi Anic Ribeiro,Cesar Cavinato Cal Abad,Ronaldo Vilela Barros,Turibio Leite Barros Neto
Revista Brasileira de Cineantropometria e Desempenho Humano , 2010,
Abstract: The objective of this study was to examine the level of flexibility in men and women of different ages by the sit-and-reach test and to classify them according to the Canadian Standardized Test of Fitness (CSTF). The results were used to elaborate a new table that reflects the population studied. The sample consisted of 16,405 physically active and inactive subjects who were divided according to age: 15 to 19 (n = 954), 20 to 29 (n = 2916), 30 to 39 (n = 2161), 40 to 49 (n = 2333), 50 to 59 (n = 2739), 60 to 69 (n = 3195), and > 70 years (n = 2107). Percentiles were calculated using the original test scores and the 20th, 40th, 60th and 80th percentiles were used as cut-offs for classification as poor, below the average, average, above the average and excellent, respectively. According to the CSTF classification, the age groups from 15 to 39 years were classified as poor, with mean flexibility ranging from 24.805±9.684 to 26.130± 10.111 cm in women and from 21.480±9.905 to 22.848±9.648 cm in men. In the 40- to 69-year age groups, mean flexibility ranged from 22.768±9.627 to 25.396±9.547 in women and from 16.396±10.136 to 19.935±9.192 cm in men and was classified as below the average. Although most of the subjects performed regular exercise, the mean flexibility level observed did not correspond to the average suggested by the CSTF, demonstrating the importance of elaborating national reference tables and of establishing new normative values such as the table proposed in this study.
Angular Velocity Operator and Barnett-Pegg Formalism  [PDF]
Ramandeep S. Johal
Physics , 1997,
Abstract: We define a new operator within Barnett-Pegg formalism for phase angle. The physical predictions for this operator correspond to those expected of an angular velocity operator. Examples studied are particle on a circle with and without magnetic field and quantum harmonic oscillator.
Barnett Relaxation in Thermally-Rotating Grains  [PDF]
A. Lazarian,W. G. Roberge
Physics , 1997, DOI: 10.1086/304309
Abstract: We present an exact formulation of the physics of Barnett relaxation. Our formulation is based on a realistic kinetic model of the relaxation mechanism which includes the alignment of the grain angular momentum in body coordinates by Barnett dissipation, disalignment by thermal fluctuations, and coupling of the angular momentum to the gas via gas damping. We solve the Fokker-Planck equation for the measure of internal alignment using numerical integration of the equivalent Langevin equation for Brownian rotation. The accuracy of our results is calibrated by comparing our numerical solutions with exact analytic results obtained for special cases.We describe an analytic approximation for the measure of alignment which fits our numerical results for cases of practical interest.
The su(n) Lie algebraic structures in the Pegg-Barnett quantization formulation  [PDF]
Jian-Qi Shen
Physics , 2003,
Abstract: We investigate the oscillator algebra of the Pegg-Barnett oscillator with a finite-dimensional number-state space and show that it possesses the su($n$) Lie algebraic structure. In addition, a so-called supersymmetric Pegg-Barnett oscillator is suggested, and the related topics such as the algebraic structure and particle occupation number of the Pegg-Barnett oscillator are briefly discussed.
The Pegg-Barnett Formalism and Covariant Phase Observables  [PDF]
Pekka Lahti,Juha-Pekka Pellonpaa
Physics , 2001, DOI: 10.1238/Physica.Regular.066a00066
Abstract: We compare the Pegg-Barnett (PB) formalism with the covariant phase observable approach to the problem of quantum phase and show that PB-formalism gives essentially the same results as the canonical (covariant) phase observable. We also show that PB-formalism can be extended to cover all covariant phase observables including the covariant phase observable arising from the angle margin of the Husimi Q-function.
Page 1 /100
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.