全文获取类型
收费全文 | 407篇 |
免费 | 62篇 |
国内免费 | 53篇 |
专业分类
化学 | 271篇 |
晶体学 | 13篇 |
力学 | 21篇 |
综合类 | 5篇 |
数学 | 57篇 |
物理学 | 155篇 |
出版年
2024年 | 4篇 |
2023年 | 6篇 |
2022年 | 17篇 |
2021年 | 14篇 |
2020年 | 21篇 |
2019年 | 16篇 |
2018年 | 17篇 |
2017年 | 8篇 |
2016年 | 26篇 |
2015年 | 22篇 |
2014年 | 22篇 |
2013年 | 31篇 |
2012年 | 34篇 |
2011年 | 26篇 |
2010年 | 28篇 |
2009年 | 22篇 |
2008年 | 10篇 |
2007年 | 16篇 |
2006年 | 17篇 |
2005年 | 19篇 |
2004年 | 8篇 |
2003年 | 6篇 |
2002年 | 11篇 |
2001年 | 9篇 |
2000年 | 6篇 |
1999年 | 9篇 |
1998年 | 8篇 |
1997年 | 6篇 |
1996年 | 10篇 |
1995年 | 10篇 |
1994年 | 4篇 |
1993年 | 13篇 |
1992年 | 7篇 |
1991年 | 10篇 |
1990年 | 10篇 |
1989年 | 7篇 |
1988年 | 5篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 3篇 |
排序方式: 共有522条查询结果,搜索用时 31 毫秒
71.
Dongbing Zha 《Mathematical Methods in the Applied Sciences》2016,39(15):4484-4495
In this paper, we give an alternative proof to the global existence result, which is originally owing to the pioneering work of Klainerman and Christodoulou, for the Cauchy problem of quasilinear wave equations with null condition in three space dimensions. The proof can display the following three features simultaneously: the Lorentz boost operator is not employed in the generalized energy estimates; the generalized energy of the solution will be always small, which was first observed by Alinhac; and the initial data are not assumed to have a compact support. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
72.
73.
74.
研究了四对甲氧基苯基金属卟啉配合物对SOCl2还原反应的电催化行为.实验结果表明,金属卟啉配合物对SOCl2还原反应有较好的电催化活性,不同中心离子配合物的活性顺序是Fe2+≈Co2+>Ni2+.这类配合物能阻止反应产物LiCl在电极表面沉积,增大电池放电容量. 相似文献
75.
76.
M. Zha C. Ferrari S. Gennari L. Zanotti C. Razetti C. Paorici 《Crystal Research and Technology》1999,34(3):311-318
It is reported for the first time the growth of urotropine (HMT) crystals by a semiopen physical vapour transport (SOPVT) technique. HMT crystals, approximately 1 cm3 in volume, are grown on a glass pedestal from solution-grown seeds. The final habit of the crystals is limited by rhomboedrical {110} faces which develop on an otherwise hemispherical shape. Preliminary X-ray diffraction investigations (rocking curves and topographs) point to a still non-homogeneous crystal structure, which very likely originates at the seed-crystal interface. However, in comparison with solution-grown samples, the best structural quality was observed in a SOPVT-grown sample. 相似文献
77.
Xuxu Bai Wanqi Jie Gangqiang Zha Wenhua Zhang Peisen Li Hui Hua Li Fu 《Applied Surface Science》2009,255(18):7966-7969
Synchrotron radiation ultraviolet photoemission spectroscopy (SRUPS) and X-ray photoelectron spectroscopy (XPS) have been applied to investigate oxygen adsorption on a cadmium zinc telluride (CZT) (1 1 1)A surface. The surface chemical composition and the surface oxidation process were monitored by recording the Te 3d, O 1s, Zn 2p, Cd 4d core level peaks, and the Cd MNN Auger peak. The CZT (1 1 1)A surface was effectively oxidized by dosing oxygen directly. The typical surface state of the clean CZT (1 1 1)A surface was identified. After oxygen exposure, this surface state disappeared and a signal due to the formation of O–CZT appeared. In addition, the work function of CZT decreased with the increasing oxygen exposure. 相似文献
78.
Zha‐Jun Zhan Gui‐Wei Rao Xiao‐Rong Hou Cheng‐Ping Li Wei‐Guang Shan 《Helvetica chimica acta》2009,92(8):1562-1567
One new alkaloid, named caldaphnidine H ( 1 ), together with eight known ones, daphnioldhanin G ( 2a ), methyl homosecodaphniphyllate ( 3 ), daphnezomine M ( 4 ), daphniyunine A ( 5 ), calyciphylline A ( 6 ), deoxycalyciphylline B ( 7 ), deoxyisocalyciphylline B ( 8 ), and calyciphylline B ( 9 ) was isolated from the leaves and stems of Daphniphyllum calycinum. The structure of 1 was established by spectral methods, especially 2D‐NMR techniques. The structure of daphnioldhanin G ( 2b ) reported previously was revised to 2a mainly by single‐crystal X‐ray diffraction and spectral analysis. 相似文献
79.
Controlled quantum state sharing of arbitrary two-qubit states with five-qubit cluster states
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
In this paper, we propose a controlled quantum state sharing scheme to share an arbitrary two-qubit state using a five-qubit cluster state and the Bell state measurement. In this scheme, the five-qubit cluster state is shared by a sender (Alice), a controller (Charlie), and a receiver (Bob), and the sender only needs to perform the Bell-state measurements on her particles during the quantum state sharing process, the controller performs a single-qubit projective measurement on his particles, then the receiver can reconstruct the arbitrary two-qubit state by performing some appropriate unitary transformations on his particles after he has known the measured results of the sender and the controller. 相似文献
80.
Recently, Huang and Zhao (Int. J. Theor. Phys. 56, 678, 2017) proposed a new scheme for controlled remote state preparation of an arbitrary two-qubit state by using two sets of three-qubit GHZ states as the quantum channel. In the scheme, Alice and Bob choose four different kinds of two-qubit projective measurement bases to measure their local qubits, respectively. We demonstrate that two sets of four-qubit GHZ states can be used to realize the deterministic controlled remote state preparation of an arbitrary two-qubit state by performing only two-qubit projective measurements. 相似文献