全文获取类型
收费全文 | 10749篇 |
免费 | 780篇 |
国内免费 | 356篇 |
专业分类
系统科学 | 1391篇 |
丛书文集 | 216篇 |
教育与普及 | 74篇 |
理论与方法论 | 293篇 |
现状及发展 | 891篇 |
研究方法 | 8篇 |
综合类 | 9012篇 |
出版年
2024年 | 19篇 |
2023年 | 30篇 |
2022年 | 59篇 |
2021年 | 70篇 |
2020年 | 40篇 |
2019年 | 19篇 |
2018年 | 749篇 |
2017年 | 773篇 |
2016年 | 462篇 |
2015年 | 142篇 |
2014年 | 176篇 |
2013年 | 181篇 |
2012年 | 426篇 |
2011年 | 1176篇 |
2010年 | 1021篇 |
2009年 | 666篇 |
2008年 | 794篇 |
2007年 | 1001篇 |
2006年 | 243篇 |
2005年 | 286篇 |
2004年 | 315篇 |
2003年 | 409篇 |
2002年 | 440篇 |
2001年 | 323篇 |
2000年 | 244篇 |
1999年 | 255篇 |
1998年 | 199篇 |
1997年 | 223篇 |
1996年 | 218篇 |
1995年 | 179篇 |
1994年 | 144篇 |
1993年 | 103篇 |
1992年 | 113篇 |
1991年 | 106篇 |
1990年 | 89篇 |
1989年 | 68篇 |
1988年 | 56篇 |
1987年 | 37篇 |
1986年 | 23篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1967年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
LuJian-ke 《武汉大学学报:自然科学英文版》2004,9(1):1-5
The homogeneous quadratic Riemann boundary value problem (1) with Hoelder continuous coefficients for the normal case was considered by the author in 1997. But the solutions obtained there are incomplete. Here its general method of solution is obtained. 相似文献
2.
去除粉状耐火材料、玻璃原料、电瓷物料中的铁磁物质,目前工业上普遍采用酸洗法。但该法生产周期长,效率低,成本高。而振动电磁除铁不但可快速、高效、低耗地除去这类物料中的铁磁杂质,且操作简便。本文给出了所设计的除铁器的振幅、生产率及振体空间在励磁回路中所需的磁感应强度等基本设计参数,为结构设计提供了理论依据 相似文献
3.
Static extracting method of software intended behavior based on API functions invoking 总被引:1,自引:0,他引:1
The method of extracting and describing the intended behavior of software precisely has become one of the key points in the fields of software behavior's dynamic and trusted authentication. In this paper, the author proposes a specified measure of extracting SIBDS (software intended behaviors describing sets) statically from the binary executable using the software's API functions invoking, and also introduces the definition of the structure used to store the SIBDS in detail. Experimental results demonstrate that the extracting method and the storage structure definition offers three strong properties: (i) it can describe the software's intended behavior accurately; (ii) it demands a small storage expense; (iii) it provides strong capability to defend against mimicry attack. 相似文献
4.
WANG Xibo ZHOU Benhai YU Gei LI Qian 《武汉大学学报:自然科学英文版》2007,12(5):946-950
μC/OS-Ⅱ is an open source real-time kernel adopting priority preemptive schedule strategy. Aiming at the problem of μC/OS-Ⅱ failing to support homology priority tasks scheduling, an approach for solution is proposed. The basic idea is adding round-robin scheduling strategy in its original scheduler in order to schedule homology priority tasks through time slice roundrobin. Implementation approach is given in detail. Firstly, the Task Control Block (TCB) is extended. And then, a new priority index table is created, in which each index pointer points to a set of homology priority tasks. Eventually, on the basis of reconstructing μC/OS-Ⅱ real-time kernel, task scheduling module is rewritten. Otherwise, schedulability of homology task supported by modified kernel had been analyzed, and deadline formula of created homology tasks is given. By theoretical analysis and experiment verification, the modified kernel can support homology priority tasks scheduling, meanwhile, it also remains preemptive property of original μC/OS-Ⅱ. 相似文献
5.
6.
7.
钟怀杰 《福建师范大学学报(自然科学版)》1993,9(3):10-14
讨论一般巴拿赫空间上非紧的黎斯算子存在问题,说明各经典巴拿赫空间上确有这种非平凡的黎斯算子,给出一类空间,其上的根算子理想与严格奇异算子理想是不重合的。 相似文献
8.
The exponential Radon transform, a generalization of the Radon transform, is defined and studied as a mapping of function
spaces. It is represented in terms of Fourier transform of its domain and range, and this leads to the harmonic decomposition
reconstruction. The results are similar results of Tretiak and Metz.
Foundation item: Supported by the National Natural Science Foundation of China (No. 19971064), Key Project of Science and
Technology of Hubei Province Education Committee.
Biography: Wang Jin-ping (1963-), male, Ph.D. candidate, research direction: numberical solution of singular integral equation
and integral transformation etc. 相似文献
9.
思想政治工作被视为一切工作的“生命线”,其地位和作用不言而喻。然而,就目前高校学生思想政治教育工作而言,受到国际,国内的政治,经济环境的影响,以及高校学生思想政治教育工作本身的诸多困扰,使高校的学生思想政治教育工作面临着严峻的挑战。如何研究新情况,形成新认识,开辟新境界,解决新问题巳是不可回避的课题。 相似文献
10.
YU Jianqiao LIAO Jianwei 《武汉大学学报:自然科学英文版》2007,12(5):887-892
We propose a multiple-tree overlay structure for resource discovery in unstructured P2P systems. Peers that have similar interests or hold similar type of resources will be grouped into a tree-like cluster. We exploit the heterogeneity of peers in each cluster by connecting peers with more capacities closer to the root of the tree. The capacity of a peer can be defined in different ways (e.g. higher network bandwidth, larger disk space, more data items of a certain type etc.) according to different needs of users or applications. 相似文献