全文获取类型
收费全文 | 337篇 |
免费 | 16篇 |
专业分类
化学 | 205篇 |
力学 | 11篇 |
数学 | 85篇 |
物理学 | 52篇 |
出版年
2024年 | 1篇 |
2023年 | 5篇 |
2022年 | 8篇 |
2021年 | 3篇 |
2020年 | 7篇 |
2019年 | 6篇 |
2018年 | 11篇 |
2017年 | 5篇 |
2016年 | 12篇 |
2015年 | 15篇 |
2014年 | 17篇 |
2013年 | 22篇 |
2012年 | 34篇 |
2011年 | 34篇 |
2010年 | 13篇 |
2009年 | 17篇 |
2008年 | 30篇 |
2007年 | 19篇 |
2006年 | 23篇 |
2005年 | 18篇 |
2004年 | 12篇 |
2003年 | 10篇 |
2002年 | 10篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1990年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1978年 | 2篇 |
1974年 | 1篇 |
排序方式: 共有353条查询结果,搜索用时 31 毫秒
121.
Andre Cardoso Barato Raphaël Chetrite Haye Hinrichsen David Mukamel 《Journal of statistical physics》2012,146(2):294-313
We investigate a new symmetry of the large deviation function of certain time-integrated currents in non-equilibrium systems.
The symmetry is similar to the well-known Gallavotti-Cohen-Evans-Morriss-symmetry for the entropy production, but it concerns
a different functional of the stochastic trajectory. The symmetry can be found in a restricted class of Markov jump processes,
where the network of microscopic transitions has a particular structure and the transition rates satisfy certain constraints.
We provide three physical examples, where time-integrated observables display such a symmetry. Moreover, we argue that the
origin of the symmetry can be traced back to time-reversal if stochastic trajectories are grouped appropriately. 相似文献
122.
We investigate the Cauchy problem for the inhomogeneous Navier‐Stokes equations in the whole n‐dimensional space. Under some smallness assumption on the data, we show the existence of global‐in‐time unique solutions in a critical functional framework. The initial density is required to belong to the multiplier space of \input amssym $\dot {B}^{n/p‐1}_{p,1}({\Bbb R}^n)$ . In particular, piecewise‐constant initial densities are admissible data provided the jump at the interface is small enough and generate global unique solutions with piecewise constant densities. Using Lagrangian coordinates is the key to our results, as it enables us to solve the system by means of the basic contraction mapping theorem. As a consequence, conditions for uniqueness are the same as for existence. © 2012 Wiley Periodicals, Inc. 相似文献
123.
124.
G. Reiter S. Al Akhrass M. Hamieh P. Damman S. Gabriele T. Vilmin E. Rapha?l 《The European physical journal. Special topics》2009,166(1):165-172
Employing mass conservation, time-resolved dewetting experiments of thin polymer films allow to determine in real time the
dynamic contact angle and the slippage length. Moreover, based on a systematic variation of interfacial properties of a polymer
brush, dewetting makes it possible to calculate the force it needs to extract a single polymer chain from its own melt.
In the visco-elastic regime close to the glass transition, the temperature and molecular weight dependence of the relaxation
time of residual stresses resulting from film preparation by spin-coating can be obtained from the evolution of the shape
of the dewetting rim.
The presented examples demonstrate that dewetting represents a powerful approach for a sensitive characterization of rheological,
frictional and interfacial properties of thin polymer films. 相似文献
125.
126.
We present a new collocated numerical scheme for the approximation of the Navier–Stokes and energy equations under the Boussinesq assumption for general grids, using the velocity–pressure unknowns. This scheme is based on a recent scheme for the diffusion terms. Stability properties are drawn from particular choices for the pressure gradient and the non-linear terms. Convergence of the approximate solutions may be proven mathematically. Numerical results show the accuracy of the scheme on irregular grids. 相似文献
127.
We show that a non-equilibrium diffusive dynamics in a finite-dimensional space takes in the Lagrangian frame of its mean local velocity an equilibrium form with the detailed balance property. This explains the equilibrium nature of the fluctuation-dissipation relations in that frame observed previously. The general considerations are illustrated on few examples of stochastic particle dynamics. 相似文献
128.
We study the singularity formation for the cubic focusing L 2-critical nonlinear Schrödinger equation on \({\mathbb{R}^{2}}\) . In a series of recent works, Merle and Raphaël have completely described the so called log–log blowup regime and proven its stability in the energy space H 1. Our aim in this paper is to investigate the stability of this blowup regime under rough perturbations in the direction of developing a theory at the level of the critical space L 2. By blending the Merle, Raphaël techniques with the quantitative I-method developed by Colliander, Keel, Staffilani, Takaoka and Tao for the study of the Cauchy problem for rough data, we obtain the stability of the log–log regime in H s for all s > 0. 相似文献
129.
Chirally asymmetric states, chemical oscillations, propagating chemical waves, and spatial patterns, are examples of far-from-equilibrium self-organization. We have found that the crystal growth front of 1,1(')-binaphthyl shows many of the characteristics of an open system in which chiral symmetry breaking has occurred. From its supercooled molten phase, 1,1(')-binaphthyl crystallizes as a conglomerate of R and S crystals when the temperature is above 145 degrees C. In addition, 1,1(')-binaphthyl in its molten phase is always racemic due to its high racemization rate. Under appropriate conditions, bimodal probability distribution of enantiomeric excess (ee) with maxima around 60% was observed. The ee was mass independent, indicating that the growth front maintains a constant ee. A kinetic model that theoretically analyzes the chiral symmetry breaking transition in the growth front of a conglomerate crystal phase was formulated. Computer simulation of the model reproduced not only the average but also the large variation of the ee observed in crystallization experiments. 相似文献
130.
Jo?l?Coulon Ilan?Thouvenin Fadi?Aldeek Lavinia?Balan Rapha?l?Schneider 《Journal of fluorescence》2010,20(2):591-597
Highly fluorescent CdTe quantum dots (QDs) stabilized by thioglycolic acid (TGA) were prepared by an aqueous solution approach
and used as fluorescent labels in detecting yeast cells. Sugars (mannose, galactose or glucose) were adsorbed on CdTe@TGA
QDs and the interaction of these nanoparticles with yeast cells was studied by fluorescence microscopy. Results obtained demonstrate
that galactose and mannose functionalized QDs associate respectively with Kluyveromyces bulgaricus and Saccharomyces cerevisiae yeast strains due to saccharide/lectin specific recognition. Glucose-functionalized CdTe QDs, which are not recognized by
cell lectins, preferentially localize in the bud scars of S. cerevisiae. 相似文献