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排序方式: 共有66条查询结果,搜索用时 15 毫秒
1.
Adrian Hernandez Santiago Salvador Rosas Castilla Albino Morales Rodriguez Elena Aleskerova Anastasia Lantushenko Viktor Kostjukov 《Molecular physics》2013,111(15):1941-1947
An approximately linear correlation has been found between the enthalpy of complexation and the area of overlap of the chromophores using published structural and thermodynamical data on the self- and hetero-association of aromatic molecules measured under similar solution conditions. This finding is consistent with the assumption that short-range van-der-Waals forces dominate over other contributions to the enthalpy of stacking of aromatic molecules. It provides a ‘model-independent’ approach for a priori estimation of the enthalpy of aromatic–aromatic stacking interactions from knowledge of the structural properties or vice versa. 相似文献
2.
Carlos A. Almeida Juan C.R. Albino Ivan F.M. Menezes Glaucio H. Paulino 《Mechanics Research Communications》2011,38(8):553-559
This paper presents a geometric nonlinear analysis formulation for beams of functionally graded cross-sections by means of a Total Lagrangian formulation. The influence of material gradation on the numerical response is investigated in detail. Two examples are given that illustrate the main features of the formulation, in which the behavior of beams of graded cross-sections is compared with homogeneous material beams. A motivation for this work is the potential development of functionally graded risers for the offshore oil exploration industry. 相似文献
3.
4.
Cusinato Marco Guercilena Federico Maria Perego Albino Logoteta Domenico Radice David Bernuzzi Sebastiano Ansoldi Stefano 《The European Physical Journal A - Hadrons and Nuclei》2022,58(5):1-69
The European Physical Journal A - PUMA, antiProton Unstable Matter Annihilation, is a nuclear-physics experiment at CERN aiming at probing the surface properties of stable and rare isotopes by use... 相似文献
5.
J. Albino O. de Aguiar H. B. Brom L. J. de Jongh G. Schmid 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1989,12(1-4):457-459
We present EPR measurements on the polynuclear metal-cluster compound Pd561Phen36O200 for temperatures ranging from 300 K to 8 K. No temperature dependence was found in either the resonance field or the line-width. The signal intensity shows a Curie-like behavior. The effect of the ligand on this behavior is discussed. We also discuss the possibility that quantum size effects govern the observed temperature dependence of the line-width and resonance field. 相似文献
6.
Y.P. Yadava D.A. Landinez Tellez M.T. de Melo J.M. Ferreira J. Albino Aguiar 《Applied Physics A: Materials Science & Processing》1998,66(4):455-458
2 ZrO5.5 has been synthesized by solid-state reaction. Structural ordering in this material has been studied by X-ray diffraction
(XRD). The XRD spectra reveal that DyBa2ZrO5.5 has an ordered complex cubic perovskite structure. The presence of superstructure reflections in the XRD spectra is characteristic
of A2BB’O6-type crystalline structure. The chemical stability of DyBa2ZrO5.5 with YBa2CuO7-δ (YBCO) superconductors has been studied by XRD and electrical resistivity measurements. These studies show that DyBa2ZrO5.5 is chemically stable with YBCO and there is no degradation in the superconducting transition temperature Tc of YBCO even when mixed up to 1:1 vol%, with DyBa2ZrO5.5 in YBCO. Detailed study of the superconducting transition region shows that Tc(onset) and Tc(0) values of pure YBCO and YBCO–DyBa2ZrO5.5 composites are similar in both cases. The implications are discussed.
Accepted: 13 October 1997 相似文献
7.
Albino Polcari Marc Dhall Frank Marti Grgoire Witz Yibing Huang Ren Flükiger 《Physica C: Superconductivity and its Applications》1998,310(1-4):177-181
AC losses in multifilamentary tapes depend on various parameters. Among them, geometrical factors such as overall tape width and thickness as well as the precise arrangement of the filaments are expected to have an important influence. Several theoretical models describe this dependency. In order to study these geometrical effects experimentally, we prepared a series of Bi(2223)/Ag tapes with gradually changing filament arrangements and tape aspect ratio, and characterised them by AC transport and magnetic measurements. The results are compared to model predictions. 相似文献
8.
9.
J. Barba-Ortega Edson Sardella J. Albino Aguiar 《Physica C: Superconductivity and its Applications》2010,470(21):1964-1967
Nonlinear time-dependent Ginzburg–Landau (TDGL) equations were solved in the present work using the link variables method. Vortex configurations were investigated in a superconducting circular sector immersed in an external magnetic field applied perpendicular to its plane. Magnetization and free energy were calculated as a function of the applied magnetic field at several temperatures. This paper illustrates how the vortices moved around at the transition fields before they become accommodated into an equilibrium configuration. A linear dependence of the magnetization dependence on temperature has been found for a certain magnetic field. 相似文献
10.
J. Barba-Ortega Clécio C. de Souza SilvaJ. Albino Aguiar 《Physica C: Superconductivity and its Applications》2009,469(14):852-856
Within the framework of nonlinear time dependent Ginzburg–Landau equations (TDGL) we study the properties of a mesoscopic superconducting film with both surfaces in contact with a thin superconducting layer at a higher critical temperature. The properties of the layer are taken into account by the de Gennes boundary conditions via the extrapolation length b. We assume that the magnetic field is parallel to the multilayer interfaces. We obtain magnetization curves and calculate the spatial distribution of the superconducting electron density using a numerical method based on the technique of gauge invariant variables. This work tests both the rectangular cross-section size and b limit for the occurrence of vortices in a mesoscopic sample of area dxxdy where dy = 80ξ(0) and dx varies discretely from 20ξ(0) to 3ξ(0). Our data also show a linear behavior of the magnetization curve and a power-law of order parameter modulus in limit b → 0-. 相似文献