全文获取类型
收费全文 | 8838篇 |
免费 | 738篇 |
国内免费 | 154篇 |
专业分类
系统科学 | 1196篇 |
丛书文集 | 139篇 |
教育与普及 | 89篇 |
理论与方法论 | 283篇 |
现状及发展 | 876篇 |
研究方法 | 24篇 |
综合类 | 7122篇 |
自然研究 | 1篇 |
出版年
2024年 | 17篇 |
2023年 | 47篇 |
2022年 | 65篇 |
2021年 | 61篇 |
2020年 | 58篇 |
2019年 | 19篇 |
2018年 | 744篇 |
2017年 | 766篇 |
2016年 | 459篇 |
2015年 | 101篇 |
2014年 | 113篇 |
2013年 | 102篇 |
2012年 | 381篇 |
2011年 | 1092篇 |
2010年 | 917篇 |
2009年 | 578篇 |
2008年 | 640篇 |
2007年 | 902篇 |
2006年 | 107篇 |
2005年 | 179篇 |
2004年 | 215篇 |
2003年 | 255篇 |
2002年 | 158篇 |
2001年 | 101篇 |
2000年 | 98篇 |
1999年 | 188篇 |
1998年 | 160篇 |
1997年 | 192篇 |
1996年 | 182篇 |
1995年 | 156篇 |
1994年 | 128篇 |
1993年 | 103篇 |
1992年 | 92篇 |
1991年 | 87篇 |
1990年 | 73篇 |
1989年 | 79篇 |
1988年 | 48篇 |
1987年 | 45篇 |
1986年 | 16篇 |
1985年 | 5篇 |
1967年 | 1篇 |
排序方式: 共有9730条查询结果,搜索用时 694 毫秒
891.
脊髓损伤是人类致残率最高的疾患之一。治疗脊髓损伤的趋势是联合应用多种技术和手段,创造出最适宜神经细胞再生恢复的环境,达到功能恢复的目的。生物材料在结构和功能上的优良性质使得它在脊髓损伤和修复中具有很好的应用前景。近年来兴起的组织工程学方法更为脊髓损伤的治疗带来新思路,即通过种子细胞—支架材料—神经营养因子复合物修复受损脊髓。本文回顾了近年来组织工程支架和细胞载体系统在脊髓损伤修复中的应用,展示了生物材料在组织工程和细胞分子治疗策略中的优越性。 相似文献
892.
Kai Xu 《系统科学与复杂性》2017,30(5):1173-1188
This paper is concerned with the problem of improving the estimator of covariance matrix under Stein’s loss. By the partial Iwasawa coordinates of covariance matrix, the corresponding risk can be split into three parts. One can use the information in the weighted matrix of weighted quadratic loss to improve one part of risk. However, this paper indirectly takes advantage of the information in the sample mean and reuses Iwasawa coordinates to improve the rest of risk. It is worth mentioning that the process above can be repeated. Finally, a Monte Carlo simulation study is carried out to verify the theoretical results. 相似文献
893.
This paper considers the nonstandard renewal risk model in which a part of surplus is invested into a Black-Scholes market whose price process is modelled by a geometric Brownian motion, claim sizes form a sequence of not necessarily identically distributed and pairwise quasi-asymptotically independent random variables with dominatedly-varying tails.The authors obtain a weakly asymptotic formula for the finite-time and infinite-time ruin probabilities.In particular,if the claims are identically distributed and consistently-varying tailed,then an asymptotic formula is presented. 相似文献
894.
895.
A new generation of cement, microbe cement, has been developed in response to the ever increasing awareness of environmental protection. Microbe cement is a new strengthening material based on microbiologically induced precipitation of calcium carbonate. This paper confirms the feasibility of binding loose sand particles using microbe cement and details the cementation mechanism of microbe cement. We have also prepared microbe cementitious materials (biosandstones). The compressive strength of the bio-sandstone, which depends on the content of calcium carbonate produced by microbially induced precipitation and the bio-mediated calcite crystal size, could be up to 12 MPa at an age of 20 days. By increasing the precipitated calcite content, the compressive strength and microstructure of bio-sandstone could be improved. 相似文献
896.
Chao Feng Meng Zhang GuoQiang Lin Qiang Gu HaiXiao Deng JianHui Chen Dong Wang ZhenTang Zhao 《科学通报(英文版)》2012,57(26):3423-3429
Cascading stages of high-gain harmonic generation(HGHG) free electron laser(FEL) is a promising way to produce fully coherent X-ray radiation.As a test facility for modern FEL R&D,the Shanghai deep ultraviolet FEL(SDUV-FEL) is now under upgrading for the cascading two stages of HGHG experiment.Since the energy of the electron beam is as low as about 185 MeV after upgrade,the total harmonic number of this two stages HGHG is only 2×2,and the wavelength of the final radiation is 196.5 nm which is the 4th harmonic of the 786 nm seed laser.With help of three-dimensional simulation codes,design studies on the FEL physics for the cascaded HGHG experiment are present based on the parameters of the upgraded SDUV-FEL facility.It is found from the simulation results that the part of the electron beam which has been used in the first stage can still generate powerful radiation in the radiator of the second stage,and this radiation will be difficult to be separated from the radiation generated by the fresh part of the electron beam.To overcome this problem,a novel method based on the energy spectrum of the electron beam is proposed in this paper to demonstrate the "fresh bunch" technique. 相似文献
897.
K-means clustering is arguably the most popular technique for partitioning data. Unfortunately, K-means suffers from the well-known
problem of locally optimal solutions. Furthermore, the final partition is dependent upon the initial configuration, making
the choice of starting partitions all the more important. This paper evaluates 12 procedures proposed in the literature and
provides recommendations for best practices. 相似文献
898.
This paper presents a fast pseudorandom generation algorithm, which is based on the BLAKE hash function and can pass the random
test of the NIST (National Institute of Standards and Technology) Statistical Test Suite. Through theoretical analysis and
experimental imitation, our new algorithm is proven to be more secure and efficient than G-SHA1. Simultaneously, we introduce
and discuss the BLAKE in detail. Its security shows that can be utilized to generate pseudorandom bit sequences, which the
experimental results show the BLAKE hash function has excellent pseudorandomness. Therefore, we believe the BLAKE is one of
the most potential candidate algorithms of SHA-3 program. 相似文献
899.
NECESSARY AND SUFFICIENT CONDITION FOR GLOBAL CONTROLLABILITY OF A CLASS OF AFFINE NONLINEAR SYSTEMS
Yimin SUN Shengwei MEI Qiang LU 《系统科学与复杂性》2007,20(4):492-500
In this paper, we investigate the global controllability of a class of n-dimensional affine nonlinear systems with n- 1 controls and constant control matrix. A necessary and sufficient condition for its global controllability has been obtained by using the methods recently developed. Furthermore, we generalize the above result to a class of affine nonlinear systems with a block-triangular-like structure. Finally, we will give three examples to show the applications of our results. 相似文献
900.
This paper gives a theoretical analysis for the algorithms to compute functional decomposition for multivariate polynomials based on differentiation and homogenization which were proposed by Ye,Dai,and Lam(1999) and were developed by Faugere,Perret(2006,2008,2009).The authors show that a degree proper functional decomposition for a set of randomly decomposable quartic homogenous polynomials can be computed using the algorithm with high probability.This solves a conjecture proposed by Ye,Dai,and Lam(1999).The authors also propose a conjecture which asserts that the decomposition for a set of polynomials can be computed from that of its homogenization and show that the conjecture is valid with high probability for quartic polynomials.Finally,the authors prove that the right decomposition factors for a set of polynomials can be computed from its right decomposition factor space. 相似文献