全文获取类型
收费全文 | 267篇 |
免费 | 11篇 |
专业分类
化学 | 181篇 |
力学 | 5篇 |
数学 | 25篇 |
物理学 | 67篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 3篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2018年 | 8篇 |
2017年 | 3篇 |
2016年 | 6篇 |
2015年 | 4篇 |
2014年 | 8篇 |
2013年 | 14篇 |
2012年 | 10篇 |
2011年 | 21篇 |
2010年 | 21篇 |
2009年 | 19篇 |
2008年 | 17篇 |
2007年 | 13篇 |
2006年 | 17篇 |
2005年 | 16篇 |
2004年 | 8篇 |
2003年 | 9篇 |
2002年 | 13篇 |
2001年 | 6篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 4篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1974年 | 1篇 |
排序方式: 共有278条查询结果,搜索用时 15 毫秒
261.
The nucleus 30 65 Zn was studied using the 52Cr(16O, 2pn)65Zn reaction at a beam energy of 65 MeV. The level scheme is extended up to an excitation energy of 10.57 MeV for spin-parity (41/2?) with several newly observed transitions placed in it. 相似文献
262.
263.
We consider the problem of a single downward arrow atom in the presence of a Fermi sea of upward arrow atoms, in the vicinity of a Feshbach resonance. We calculate the chemical potential and the effective mass of the downward arrow atom using two simple approaches: a many-body variational wave function and a T-matrix approximation. These two methods lead to the same results and are in good agreement with existing quantum Monte Carlo calculations performed at unitarity and, in one dimension, with the known exact solution. Surprisingly, our results suggest that, even at unitarity, the effect of interactions is fairly weak and can be accurately described using single particle-hole excitations. We also consider the case of unequal masses. 相似文献
264.
Fedeyko JM Egolf-Fox H Fickel DW Vlachos DG Lobo RF 《Langmuir : the ACS journal of surfaces and colloids》2007,23(8):4532-4540
We report the effect of aluminum on the formation and structure of silica nanoparticles formed in basic solutions of small organic and inorganic cations using a combination of small-angle X-ray scattering, conductivity, pH, and 27Al NMR spectroscopy methods. At low silica concentrations, our observations agree with previous reports and show the formation of small oligomers ((HO)4-nAl(OSi(OH)3)n)- that can be modeled qualitatively using a simple aqueous speciation model. We also find that aluminum drastically reduces the concentration of silica at which nanoparticles are formed. Using organic cations, the particles are smaller than the ones observed in pure silica systems (1.5 nm vs approximately 3 nm diameter), but in the case of sodium cations, larger particles are detected ( approximately 10 nm in diameter). The data suggests that sodium cations are incorporated within the inorganic silica/alumina core, as opposed to organic cations that appear to be excluded from such clusters. Important insights are gained by making analogies to the behavior of mixed surfactant systems using regular solution theory and noting that the formation of Si-O-Al bonds (as measured by the DeltaGdegrees(rxn) of condensation) is much more favorable than the formation of Si-O-Si bonds. 相似文献
265.
A. O. Lobo F. R. Marciano I. Regiani S. C. Ramos J. T. Matsushima E. J. Corat 《Theoretical chemistry accounts》2011,130(4-6):1071-1082
For the first time, the mechanism of growth of plate-like n-HA electrodeposited on superhydrophilic vertically aligned multi-walled carbon nanotubes (VACNT) is presented and a model for the specific growth preference is discussed. Results show that the carboxyl (carboxylic acid)/carboxylate functional groups directly attached on VACNT tips after oxygen plasma treatment were essential for the acceleration of the OH? formation and the deposition of plate-like HA crystals. FEG-SEM, EDX and XRD showed that a homogeneous highly crystalline HA film, stoichiometric and with preferential growth in the (002) plane direction, was formed. 相似文献
266.
Artur J.M. Valente Ana C.F. RibeiroMarigese B.B.J. Rita Rui A. CarvalhoMiguel A. Esteso Victor M.M. Lobo 《Journal of Molecular Liquids》2011,161(3):125-131
Mutual diffusion coefficients and electrical conductivity of a well-known food additive and supplement, or excipient in pharmaceutical formulations, calcium lactate, have been measured in the absence and presence of β-cyclodextrin in aqueous solutions, at 298.15 K. The dependence of conductivity on concentration has been analysed using the Fuoss-Edelson method. The values of the Nernst diffusion coefficients, for binary solutions, derived from conductance and from diffusion experiments are in good agreement. The presence of β-cyclodextrin leads to a non-expected effect on the transport properties of the aqueous solutions of calcium lactate. These data have been justified with help of 1H NMR spectroscopy. The effect on the water structure, reducing the hydration shell of lactate, is argued. This leads to an increase of the effective concentration of calcium lactate in solution contributing to an increase in the diffusion coefficients and a decrease in the dependence of the electrical conductance on the concentration. 相似文献
267.
Remo Garattini Francisco S. N. Lobo 《The European Physical Journal C - Particles and Fields》2014,74(5):1-11
In this paper the Gribov gap equation at finite temperature is analyzed. The solutions of the gap equation (which depend explicitly on the temperature) determine the structure of the gluon propagator within the semi-classical Gribov approach. The present analysis is consistent with the standard confinement scenario for low temperatures, while for high enough temperatures, deconfinement takes place and a free gluon propagator is obtained. An intermediate regime in between the confined and free phases can be read off from the resulting gluon propagator, which appears to be closely related to partial deconfinement. 相似文献
268.
Dr. Bathini Veeraprakash Dr. Abdul K. J. Shanavas Dr. Goddeti S. M. Reddy Dr. Nitin P. Lobo Prof. Krishna V. Ramanathan Dr. Tanneru Narasimhaswamy 《Chemphyschem》2023,24(23):e202300353
Mesogens that vary in shape anisometry have been investigated by 13C solid-state NMR in the liquid crystalline phase to inspect the conformations. The molecules examined comprise of (i) rod-like mesogen with three-phenyl ring core and terminal hexyloxy chains, (ii) three-ring core linked to the fourth phenyl ring via a spacer, and (iii) trimesic acid connected to three side arms core units through a spacer. The order parameter (Szz) values for the phenyl rings of the rod-like mesogen are 0.65–0.68, while the mesogen with a three-ring core linked to a phenyl ring via spacer showed dissimilarity. Consequently, for the core unit phenyl rings, Szz is ~0.70, and the terminal phenyl ring showed a low value of 0.12. For the trimesic acid based mesogen, the Szz value for the side arm phenyl rings is ~0.53, and for the central phenyl ring, a very low value of 0.11 is witnessed. By considering the ordering of the rod-like mesogen as a yardstick and employing the ratios of Szz values of the phenyl rings, the average conformations of other mesogens are arrived. Accordingly, for the trimesic acid based mesogen, a tripod-like conformation instead of λ shape is proposed in the liquid crystalline phase. 相似文献
269.
Determination of 13C chemical shift anisotropy tensors and molecular order of 4-hexyloxybenzoic acid
Lobo NP Prakash M Narasimhaswamy T Ramanathan KV 《The journal of physical chemistry. A》2012,116(28):7508-7515
4-Alkoxy benzoic acids belong to an important class of thermotropic liquid crystals that are structurally simple and often used as starting materials for many novel mesogens. 4-Hexyloxybenzoic acid (HBA) is a homologue of the same series and exhibits an enantiotropic nematic phase. As this molecule could serve as an ideal model compound, high resolution (13)C NMR studies of HBA in solution, solid, and liquid crystalline phases have been undertaken. In the solid state, two-dimensional separation of undistorted powder patterns by effortless recoupling (2D SUPER) experiments have been carried out to estimate the magnitude of the components of the chemical shift anisotropy (CSA) tensor of all the aromatic carbons. These values have been used subsequently for calculating the orientational order parameters in the liquid crystalline phase. The CSA values computed by density functional theory (DFT) calculations showed good agreement with the 2D SUPER values. Additionally, (13)C-(1)H dipolar couplings in the nematic phase have been determined by separated local field (SLF) spectroscopy at various temperatures and were used for computing the order parameters, which compared well with those calculated by using the chemical shifts. It is anticipated that the CSA values determined for HBA would be useful for the assignment of carbon chemical shifts and for the study of order and dynamics of structurally similar novel mesogens in their nematic phases. 相似文献
270.
M. P. Lobo 《The European Physical Journal B - Condensed Matter and Complex Systems》2006,50(4):613-615
The Y chromosomes are genetically degenerate and do
not recombine with their matching partners X. Non-recombination of
XY pairs has been pointed out as the key factor for the degeneration of the Y chromosome.
The aim here is to show that there is a mathematical
asymmetry in sex chromosomes which leads to the degeneration of Y chromosomes
even in the absence of XX and XY recombination.
A model for sex-chromosome evolution in a stationary regime is
proposed. The consequences of their asymmetry are analyzed and lead us
to a couple of conclusions. First, Y chromosome
degeneration shows up
more often than X chromosome
degeneration. Second, if nature prohibits female mortalities from beeing
exactly
, then Y chromosome degeneration is inevitable. 相似文献