全文获取类型
收费全文 | 5410篇 |
免费 | 1465篇 |
国内免费 | 2288篇 |
专业分类
化学 | 3256篇 |
晶体学 | 150篇 |
力学 | 561篇 |
综合类 | 253篇 |
数学 | 1226篇 |
物理学 | 3717篇 |
出版年
2024年 | 54篇 |
2023年 | 169篇 |
2022年 | 165篇 |
2021年 | 208篇 |
2020年 | 159篇 |
2019年 | 219篇 |
2018年 | 116篇 |
2017年 | 240篇 |
2016年 | 255篇 |
2015年 | 274篇 |
2014年 | 481篇 |
2013年 | 372篇 |
2012年 | 391篇 |
2011年 | 418篇 |
2010年 | 375篇 |
2009年 | 443篇 |
2008年 | 504篇 |
2007年 | 447篇 |
2006年 | 422篇 |
2005年 | 432篇 |
2004年 | 424篇 |
2003年 | 348篇 |
2002年 | 352篇 |
2001年 | 319篇 |
2000年 | 214篇 |
1999年 | 195篇 |
1998年 | 161篇 |
1997年 | 159篇 |
1996年 | 118篇 |
1995年 | 139篇 |
1994年 | 124篇 |
1993年 | 84篇 |
1992年 | 92篇 |
1991年 | 67篇 |
1990年 | 69篇 |
1989年 | 70篇 |
1988年 | 25篇 |
1987年 | 19篇 |
1986年 | 16篇 |
1985年 | 9篇 |
1984年 | 4篇 |
1983年 | 6篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1959年 | 2篇 |
排序方式: 共有9163条查询结果,搜索用时 468 毫秒
951.
文研究了 N 指标 d 维广义α-stable过程自相交局部时增量的Holder律. 并利用所得自相交局部时的性质, 证明了该过程重点的存在性, 得到了该过程多重时的Hausdorff维数及测度的下界.所得结论包含并推广了广义布朗单及stable单相应的结果. 相似文献
952.
953.
采用反向悬浮聚合法,丙烯酸(AA)和丙烯酰胺(AM)为单体,过硫酸钾(KBS)作引发剂,N,N-亚甲基双丙烯酰胺(MBA)作交联剂,制备了一种非包覆遇水膨胀型自修复剂LF-1,其结构经SEM和IR表征。结果表明,LF-1分散均匀,表观形态呈多孔、粗糙褶皱状。将2%LF-1加入水泥浆中,水泥浆流动度为20.1 cm,失水52 mL,稠化时间217 min;用5000 mg/L的盐水养护造缝水泥石,12 h内即无渗透性;水泥石24 h抗压强度为16.1 MPa,抗折强度为4.92 MPa。
相似文献
954.
N-soliton solutions of the hierarchy of non-isospectral mKdV equation with self-consistent sources and the hierarchy of non-isospectral sine-Gordon equation with self-consistent sources are obtained via the inverse scattering transform. 相似文献
955.
We propose a method to construct the integrable Rosochatius deformations for an integrable couplings equations hierarchy. As applications, the integrable Rosochatius deformations of the coupled CKdV hierarchy with self-consistent sources and its Lax representation are presented. 相似文献
956.
WANG Fei YAN Yu YUAN Zhou BAI Xue DU Xiao-Bo WANG Wen-Quan SU Feng JIN Han-Min 《中国物理快报》2010,27(6):210-212
Ribbons of nominal compositions YCo5 Cx (x = 0, 0.2, 0.4, 0.6) are prepared by melt spinning at surface velocities v = 5, 10, 15, 20, 25, 30 and 35 m/s. YCo5 ribbon is crystallized in a single YCo5 phase of hexagonal CaCu5 structure. A small quantity of YCoC2 phase appears in the ribbons with C addition besides the YCo5 phase. With the increase of x the lattice constant c increases and a along with the unit cell volume decreases. The largest values of iHc = 888 kA/m and (BH)max = 58.4 k Jim3 at present for the YCo5 ribbon system were obtained with x = 0.4 and v = 20 m/s. The improvement of the permanent magnetic properties is rooted in the refinement of the microstructure and the appearance of the YCoC2 phase which can act as domain wall pinning centers. 相似文献
957.
Effect of Annealing on Microstructure and Electrical Characteristics of Doped Poly (3-Hexylthiophene) Films 下载免费PDF全文
The effect of annealing on the microstructure and electrical characteristics of poly (3-hexylthiophene) (P3HT) films doped with very small amounts of the electron acceptor 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) is studied. X-ray diffraction and UV-vis spectrum studies show that unlike the pure P3HT film, the thermal treatment on the doped fihns under an Ar atmosphere can effectively enhance the crystalline order of P3HT films, as well as successfully facilitate the orientation of the polymer chains. This improvement is attributed to the electrostatic force between P3HT and F4-TCNQ molecules. This force induces the polymer chains to crystallize and orient during the annealing process. As a result, annealing significantly improves performance, especially for the Ion/Ioff ratio of the TFTs based on the doped P3HT films. 相似文献
958.
Intensity Distribution and Phase Vortices of Speckle Fields Generated by Multi-Aperture Random Scattering Screens 下载免费PDF全文
The intensity distribution and phase vortices of the speckle fields generated by multi-aperture random scattering screens are simulated, and it is found that the vortices exhibit layer-like structures and the dislocation phenomena occur in the local phase patterns produced by the two-pinhole aperture, whose phase distributions appear as striped structures. For three- or four-pinhole aperture, there are many circular bright spots appearing in the speckle grains, and there is one vortex between the neighboring circular bright spots. The positive and negative phase vortex lattices appear in the phase distributions, and the regions circled by the isothetic phase lines form irregular quadrilaterals or hexagons. Moreover, the relative positions of the vortices or bright spots can be adjusted by changing those of the pinhole apertures. 相似文献
959.
Using self-consistent calculations of million-atom SchrSdinger-Poisson equations, we investigate the I-V characteristics of tunnelling and ballistic transport of nanometer metal oxide semiconductor field effect transistors (MOSFET) based on a full 3-D quantum mechanical simulation under nonequilibtium condition. Atomistic empirical pseudopotentials are used to describe the device Hamiltonian and the underlying bulk band structure. We find that the ballistic transport dominates the I-V characteristics, whereas the effects of tunnelling cannot be neglected with the maximal value up to 0.8mA/μm when the channel length of MOSFET scales down to 25 nm. The effects of tunnelling transport lower the threshold voltage Vt. The ballistic current based on fully 3-D quantum mechanical simulation is relatively large and has small on-off ratio compared with results derived from the calculation methods of Luo et al. 相似文献
960.
不同于传统的晶体,准晶由非单一的结构单元以一种非重复的方式铺满空间而构成.准晶的形成依赖于短程序和长程序之间微妙的协同,因此准晶常常只在很窄的参数窗口内能得到.近年来,人们利用纳米以至微米级的结构单元,通过溶液中自组装或者在模板上生长,成功地获得了多种大尺寸结构单元的准晶结构.近年的研究还发现,在自然界的矿物中和中世纪伊斯兰建筑装饰上都能找到准晶结构.对准晶结构的多角度、多学科探索,有助于实现准晶的人工设计和生长. 相似文献