全文获取类型
收费全文 | 136篇 |
免费 | 0篇 |
专业分类
化学 | 37篇 |
数学 | 6篇 |
物理学 | 93篇 |
出版年
2022年 | 1篇 |
2019年 | 1篇 |
2016年 | 3篇 |
2014年 | 4篇 |
2013年 | 3篇 |
2012年 | 7篇 |
2011年 | 11篇 |
2010年 | 7篇 |
2009年 | 3篇 |
2008年 | 8篇 |
2007年 | 9篇 |
2006年 | 9篇 |
2005年 | 4篇 |
2004年 | 4篇 |
2003年 | 6篇 |
2002年 | 5篇 |
2001年 | 11篇 |
2000年 | 6篇 |
1999年 | 5篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1986年 | 1篇 |
1981年 | 4篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1973年 | 3篇 |
1930年 | 1篇 |
排序方式: 共有136条查询结果,搜索用时 359 毫秒
11.
Similarly and highly charged plates in the presence of multivalent counterions attract each other and form electrostatically bound states. Using Monte-Carlo simulations, we obtain the interplate pressure in the global parameter space. The equilibrium plate separation, where the pressure changes from attractive to repulsive, exhibits a novel unbinding transition. A systematic and asymptotically exact strong-coupling field theory yields the bound state from a competition between counterion entropy and electrostatic attraction, in agreement with simple scaling arguments and simulations. 相似文献
12.
The European Physical Journal E - The Poisson-Boltzmann (PB) approach gives asymptotically exact counter-ion density profiles around macroscopic charged objects and forces between macroscopic... 相似文献
13.
14.
Juliana S Luz Celso RR Ramos Márcia CT Santos Patricia P Coltri Fernando L Palhano Debora Foguel Nilson IT Zanchin Carla C Oliveira 《BMC biochemistry》2010,11(1):22
Background
The archaeal exosome is formed by a hexameric RNase PH ring and three RNA binding subunits and has been shown to bind and degrade RNA in vitro. Despite extensive studies on the eukaryotic exosome and on the proteins interacting with this complex, little information is yet available on the identification and function of archaeal exosome regulatory factors. 相似文献15.
The quadrupole moment of the 535 keV state of 133La has been derived from a time-differential perturbed angular correlation measurement in an environment of La metal. The effective electric gradient is known from a nuclear quadrupole resonance measurement with the ground state of 139La. The result Q = 0.35 ± 0.03 b does not confirm a proposed shape isomerism. 相似文献
16.
E. Gerdau J. Birke H. Winkler J. Braunsfurth M. Forker G. Netz 《Zeitschrift für Physik A Hadrons and Nuclei》1973,263(1):5-14
Spinrotation spectra of polycrystalline (NH4)3HfF7 in which radioactive181Hf was incorporated have been measured in the temperature range from ?196 °C to + 70 °C. The spectra were interpretated on the base of the stochastic model of M. Blume. It was assumed that reorientations of the [HfF7]3? polyhedra take place at random. The resulting fluctuation rates can be understood as to be caused by an activation process. The activation energy was determined to 0.324(12) eV in agreement with NMR measurements on19F in this compound. 相似文献
17.
We consider the linearized time-dependent Navier-Stokes equation including finite compressibility and viscosity. We first
constitute the Green's function, from which we derive the flow profiles and response functions for a plane, a sphere and a
cylinder for arbitrary surface slip length. For high driving frequency the flow pattern is dominated by the diffusion of vorticity
and compression, for low frequency compression propagates in the form of sound waves which are exponentially damped at a screening
length larger than the sound wave length. The crossover between the diffusive and propagative compression regimes occurs at
the fluid's intrinsic frequency w \omega ∼ c
2
r0 \rho_{0}^{}/h \eta , with c the speed of sound, r0 \rho_{0}^{} the fluid density and h \eta the viscosity. In the propagative regime the hydrodynamic response function of spheres and cylinders exhibits a high-frequency
resonance when the particle size is of the order of the sound wave length. A distinct low-frequency resonance occurs at the
boundary between the propagative and diffusive regimes. Those resonant features should be detectable experimentally by tracking
the diffusion of particles, as well as by measuring the fluctuation spectrum or the response spectrum of trapped particles.
Since the response function depends sensitively on the slip length, in principle the slip length can be deduced from an experimentally
measured response function. 相似文献
18.
Recent experimental advances using fluorescence correlation spectroscopy (FCS) have given unprecedented information about the small-scale kinetics of large biopolymers in solution. However some of the first studies in this direction yielded conflicting results for the mean squared displacement of the tagged end-point of a DNA chain, deviating from traditional theories of polymer dynamics. Spurred by this controversy, we have developed a hydrodynamic mean-field theory for single semiflexible polymers which points to a resolution of the differing experimental observations. The theory precisely captures, without fitting parameters, one set of recent FCS results, reproducing the experimental dynamics over five decades in time and three decades of chain lengths. The success of the theory makes it an excellent candidate for a variety of biophysical contexts where the internal fluctuations of semiflexible polymers play a role. 相似文献
19.
Loops are abundant in native RNA structures and proliferate close to the unfolding transition. By including a statistical weight approximately l(-c) for loops of length l in the recursion relation for the partition function, we show that the heat capacity depends sensitively on the presence and value of the exponent c, even for a short explicit tRNA sequence. For long homo-RNA, we analytically calculate the critical temperature and critical exponents which exhibit a nonuniversal dependence on c. 相似文献
20.
Lima ER Horinek D Netz RR Biscaia EC Tavares FW Kunz W Boström M 《The journal of physical chemistry. B》2008,112(6):1580-1585
Mean-field theories that include nonelectrostatic interactions acting on ions near interfaces have been found to accommodate many experimentally observed ion specific effects. However, it is clear that this approach does not fully account for the liquid molecular structure and hydration effects. This is now improved by using parametrized ionic potentials deduced from recent nonprimitive model molecular dynamics (MD) simulations in a generalized Poisson-Boltzmann equation. We investigate how ion distributions and double layer forces depend on the choice of background salt. There is a strong ion specific double layer force set up due to unequal ion specific short-range potentials acting between ions and surfaces. 相似文献