全文获取类型
收费全文 | 20542篇 |
免费 | 1256篇 |
国内免费 | 1140篇 |
专业分类
化学 | 2083篇 |
晶体学 | 14篇 |
力学 | 295篇 |
综合类 | 224篇 |
数学 | 2571篇 |
物理学 | 1893篇 |
综合类 | 15858篇 |
出版年
2024年 | 68篇 |
2023年 | 208篇 |
2022年 | 455篇 |
2021年 | 520篇 |
2020年 | 437篇 |
2019年 | 440篇 |
2018年 | 452篇 |
2017年 | 547篇 |
2016年 | 567篇 |
2015年 | 637篇 |
2014年 | 1046篇 |
2013年 | 1053篇 |
2012年 | 1071篇 |
2011年 | 1159篇 |
2010年 | 887篇 |
2009年 | 978篇 |
2008年 | 1126篇 |
2007年 | 1509篇 |
2006年 | 1458篇 |
2005年 | 1334篇 |
2004年 | 1181篇 |
2003年 | 1016篇 |
2002年 | 854篇 |
2001年 | 639篇 |
2000年 | 528篇 |
1999年 | 448篇 |
1998年 | 352篇 |
1997年 | 295篇 |
1996年 | 252篇 |
1995年 | 259篇 |
1994年 | 203篇 |
1993年 | 165篇 |
1992年 | 144篇 |
1991年 | 130篇 |
1990年 | 111篇 |
1989年 | 109篇 |
1988年 | 80篇 |
1987年 | 68篇 |
1986年 | 46篇 |
1985年 | 17篇 |
1984年 | 25篇 |
1983年 | 7篇 |
1982年 | 14篇 |
1981年 | 9篇 |
1980年 | 7篇 |
1979年 | 6篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1973年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
81.
水文资料整编管理系统的设计思路及功能实现 总被引:4,自引:0,他引:4
介绍了水文资料整编管理系统的设计思路、数据结构及功能实现,采用Microsoft Visual Basic6.0为开发工具,以Microsoft Access2000为数据管理平台,包括了数据采集录入、计算整理汇总、图形绘制、报表打印,在水文资料整编中有较强的应用价值. 相似文献
82.
J. A. Morrison 《Queueing Systems》1991,9(1-2):191-213
In this paper the steady-state behavior of a closed queueing network with multiple classes and large populations is investigated. One of the two nodes of the network simply introduces random delays and the discipline in the other node is discriminatory processor sharing. The network is not product-form, so not even the steady-state behavior is known. We assume that the usage is moderately heavy, and obtain two-term asymptotic approximations to the mean number of jobs, and the mean sojourn time, of each class of jobs in the processor node. We also obtain the leading term in the asymptotic approximation to the joint distribution of the number of jobs in the processor node, which is a zero-mean multivariate Gaussian distribution around a line through the origin. 相似文献
83.
李强 《沈阳师范大学学报(自然科学版)》2003,21(1):31-33
介绍了用DreamweaverUltraDev来实现动态网页的优点 ,并给出实例剖析 . 相似文献
84.
This paper seeks to solve the difficult nonlinear problem in financial markets on the complex system theory and the nonlinear
dynamics principle, with the data-model-concept-practice issue-oriented reconstruction of the phase space by the high frequency
trade data. In theory, we have achieved the differentiable manifold geometry configuration, discovered the Yang-Mills functional
in financial markets, obtained a meaningful conserved quantity through corresponding space-time non-Abel localization gauge
symmetry transformation, and derived the financial solitons, which shows that there is a strict symmetry between manifold
fiber bundle and guage field in financial markets. In practical applications of financial markets, we have repeatedly carried
out experimental tests in a fluctuant evolvement, directly simulating and validating the existence of solitons by researching
the price fluctuations (society phenomena) using the same methods and criterion as in natural science and in actual trade
to test the stock Guangzhou Proprietary and the futures Fuel Oil in China. The results demonstrate that the financial solitons
discovered indicates that there is a kind of new substance and form of energy existing in financial trade markets, which likely
indicates a new science paradigm in the economy and society domains beyond physics.
相似文献
85.
Exterior tomographic data are taken over lines outside a central region, and such data occur in the industrial nondestructive evaluation of large objects such as rockets. We explain, using microlocal analysis, which singularities are well reconstructed from exterior data, and we explain how this phenomenon is reflected in the singular value decomposition for the exterior transform [E.T. Quinto, Singular value decompositions and inversion methods for the exterior Radon transform and a spherical transform, J. Math. Anal. Appl. 95 (1983) 437–448]. We extend Lambda Tomography to exterior data and to limited angle exterior data. The algorithm is tested on industrial data from Perceptics, Inc. 相似文献
86.
The excess molar enthalpy of ternary mixture for 3-diethylaminopropylamine+heptane+cyclohexane were measured using a Calvet
microcalorimeter at 303.15 K.
Empirical equations, Redlich-Kister, Tsao-Smith, and Kohler and group contribution models, UNIFAC (modified version) and DISQUAC
have been applied. A reasonable representation of ternary data is obtained.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
87.
We consider goodness of fit tests for the Rayleigh distribution with grouped data. New Kolmogrov–Smirnov type tests are suggested and compared with the traditional chi-square and likelihood ratio tests. The results show that some of the suggested tests have a good power performance as compared with the traditional ones. 相似文献
88.
本文首先针对散乱数据拟合的Shepard方法,结合截断多项式、B样条基函数和指数函数来构造其权函数,使新的权函数具有更高的光滑度和更好的衰减性,并且其光滑性和衰减性可以根据实际需要自由调节,从而提高了曲面的拟合质量.同时还给出一种类似的局部插值方法.另外,本文还基于多重二次插值,结合多元样条的思想,给出了两个局部插值算法.该算法较好地继承了多重二次插值曲面的性质,从而保证了拟合曲面具有好地光顺性和拟合精度.曲面整体也具有较高的光滑性. 相似文献
89.
Xie Zhijian Tan Qiulin 《International Journal of Infrared and Millimeter Waves》2006,27(12):1639-1649
To counter the problems of gas accidents in coal mines, family safety resulted from using gas, a new infrared detection system
with integration and miniaturization has been developed. The infrared detection optics principle used in developing this system
is mainly analyzed. The idea that multi gas detection is introduced and guided through analyzing single gas detection is got
across. Through researching the design of cell structure, the cell with integration and miniaturization has been devised.
The way of data transmission on Controller Area Network (CAN) bus is explained. By taking Single-Chip Microcomputer (SCM)
as intelligence handling, the functional block diagram of gas detection system is designed with its hardware and software
system analyzed and devised. This system designed has reached the technology requirement of lower power consumption, mini-volume,
big measure range, and able to realize multi-gas detection. 相似文献
90.
Robert S. Maier 《Random Structures and Algorithms》1991,2(4):379-420
We analyze the performance of a prototypical scheme for shared storage allocation: two initially empty stacks evolving in a contiguous block of memory of size m. We treat the case in which the stacks are more likely to shrink than grow, but with the probabilities of insertion and deletion allowed to depend arbitrarily on stack height as a fraction of m. New results are obtained on the m → ∞ asymptotics of the stack collision time, and of the final stack heights. The results of Wentzell and Freidlin on the large deviations of Markov chains are used, and the relation of their formalism to the Hamiltonian formulation of classical mechanics is emphasized. Certain results on higher-order asymptotics follow from WKB expansions. 相似文献