全文获取类型
收费全文 | 552篇 |
免费 | 3篇 |
国内免费 | 3篇 |
专业分类
化学 | 296篇 |
晶体学 | 7篇 |
力学 | 17篇 |
数学 | 33篇 |
物理学 | 205篇 |
出版年
2020年 | 3篇 |
2018年 | 4篇 |
2014年 | 5篇 |
2013年 | 23篇 |
2012年 | 10篇 |
2011年 | 18篇 |
2010年 | 14篇 |
2009年 | 9篇 |
2008年 | 20篇 |
2007年 | 19篇 |
2006年 | 15篇 |
2005年 | 21篇 |
2004年 | 25篇 |
2003年 | 10篇 |
2002年 | 12篇 |
2001年 | 14篇 |
2000年 | 13篇 |
1999年 | 12篇 |
1998年 | 12篇 |
1997年 | 4篇 |
1996年 | 12篇 |
1995年 | 9篇 |
1994年 | 11篇 |
1993年 | 11篇 |
1992年 | 10篇 |
1991年 | 13篇 |
1990年 | 9篇 |
1989年 | 7篇 |
1988年 | 9篇 |
1987年 | 9篇 |
1986年 | 6篇 |
1985年 | 28篇 |
1984年 | 16篇 |
1983年 | 7篇 |
1982年 | 11篇 |
1981年 | 7篇 |
1980年 | 11篇 |
1979年 | 9篇 |
1978年 | 9篇 |
1977年 | 6篇 |
1976年 | 10篇 |
1975年 | 13篇 |
1974年 | 11篇 |
1973年 | 9篇 |
1972年 | 7篇 |
1971年 | 3篇 |
1970年 | 3篇 |
1969年 | 3篇 |
1968年 | 3篇 |
1937年 | 3篇 |
排序方式: 共有558条查询结果,搜索用时 15 毫秒
61.
Avgoustidis A Copeland EJ Moss A Pogosian L Pourtsidou A Steer DA 《Physical review letters》2011,107(12):121301
We study signatures of cosmic superstring networks containing strings of multiple tensions and Y junctions, on the cosmic microwave background (CMB) temperature and polarization spectra. Focusing on the crucial role of the string coupling constant g(s), we show that the number density and energy density of the scaling network are dominated by different types of string in the g(s) ~ 1 and g(s) ? 1 limits. This can lead to an observable shift in the position of the B-mode peak--a distinct signal leading to a direct constraint on g(s). We forecast the joint bounds on g(s) and the fundamental string tension μ(F) from upcoming and future CMB polarization experiments, as well as the signal to noise in detecting the difference between B-mode signals in the limiting cases of large and small g(s). We show that such a detectable shift is within reach of planned experiments. 相似文献
62.
Gareth AD Hardy Nesrina Imami Mark R Nelson Ann K Sullivan Ron Moss Marlén MI Aasa-Chapman Brian Gazzard Frances M Gotch 《Journal of immune based therapies and vaccines》2007,5(1):6-12
Background
Fully functional HIV-1-specific CD8 and CD4 effector T-cell responses are vital to the containment of viral activity and disease progression. These responses are lacking in HIV-1-infected patients with progressive disease. We attempted to augment fully functional HIV-1-specific CD8 and CD4 effector T-cell responses in patients with advanced chronic HIV-1 infection. 相似文献63.
64.
65.
66.
William F Moss 《Journal of Mathematical Analysis and Applications》1980,78(2):574-587
Exitence of fundamental solutions is established for a class of degenerate or singular, second-order, linear elliptic partial differential equations. This class contains, for example, Tricomi's equation in the upper half-plane which arises in the study of aerodynamics; the equation of Weinstein's generalized axially symmetric potential theory which arises in the study of fluid dynamics and elasticity; and Schrödinger's equation with a singular potential which arises in quantum mechanics. 相似文献
67.
Single axial mode pumping and external mirror operation of a pulsed spin-flip Raman laser at 10.6 μm
By the addition of an external cavity to a single axial mode, TEA CO2 laser pumped, In Sb spin-flip Raman laser, a tenfold increase in first Stokes output and a twenty-five fold increase in second Stokes and anti-Stokes outputs has been observed. 相似文献
68.
69.
D. Pudo B. Corcoran C. Monat M. Pelusi D.J. Moss B.J. Eggleton T.P. White L. O’Faolain T.F. Krauss 《Photonics and Nanostructures》2010,8(2):67-71
We demonstrate bit error rate improvement, corroborated by eye diagram measurements, of a (10 MHz) amplitude distorted 10 Gbit/s data signal in silicon photonic crystal waveguides. This demonstration exploits a power clamping nonlinear transfer function, provided by slow light enhancement of nonlinear absorption in these waveguides. 相似文献
70.
A. D. Fitt D. P. Mason E. A. Moss 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》2007,81(2):1049-1067
The propagation of a two-dimensional fluid-driven fracture in impermeable rock is considered. The fluid flow in the fracture
is laminar. By applying lubrication theory a partial differential equation relating the half-width of the fracture to the
fluid pressure is derived. To close the model the PKN formulation is adopted in which the fluid pressure is proportional to
the half-width of the fracture. By considering a linear combination of the Lie point symmetries of the resulting non-linear
diffusion equation the boundary value problem is expressed in a form appropriate for a similarity solution. The boundary value
problem is reformulated as two initial value problems which are readily solved numerically. The similarity solution describes
a preexisting fracture since both the total volume and length of the fracture are initially finite and non-zero. Applications
in which the rate of fluid injection into the fracture and the pressure at the fracture entry are independent of time are
considered. 相似文献