全文获取类型
收费全文 | 532篇 |
免费 | 36篇 |
国内免费 | 48篇 |
专业分类
电工技术 | 22篇 |
综合类 | 124篇 |
化学工业 | 23篇 |
金属工艺 | 6篇 |
机械仪表 | 32篇 |
建筑科学 | 28篇 |
矿业工程 | 1篇 |
能源动力 | 8篇 |
轻工业 | 6篇 |
水利工程 | 4篇 |
石油天然气 | 10篇 |
武器工业 | 1篇 |
无线电 | 53篇 |
一般工业技术 | 38篇 |
冶金工业 | 40篇 |
原子能技术 | 4篇 |
自动化技术 | 216篇 |
出版年
2023年 | 4篇 |
2022年 | 8篇 |
2021年 | 7篇 |
2020年 | 10篇 |
2019年 | 7篇 |
2018年 | 7篇 |
2017年 | 11篇 |
2016年 | 9篇 |
2015年 | 22篇 |
2014年 | 27篇 |
2013年 | 24篇 |
2012年 | 26篇 |
2011年 | 41篇 |
2010年 | 25篇 |
2009年 | 46篇 |
2008年 | 29篇 |
2007年 | 44篇 |
2006年 | 28篇 |
2005年 | 38篇 |
2004年 | 23篇 |
2003年 | 24篇 |
2002年 | 22篇 |
2001年 | 22篇 |
2000年 | 17篇 |
1999年 | 13篇 |
1998年 | 7篇 |
1997年 | 9篇 |
1996年 | 6篇 |
1995年 | 3篇 |
1994年 | 6篇 |
1993年 | 11篇 |
1992年 | 2篇 |
1990年 | 5篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1973年 | 1篇 |
1961年 | 1篇 |
1958年 | 2篇 |
排序方式: 共有616条查询结果,搜索用时 15 毫秒
1.
讨论了Web服务提供方的安全问题,通过对Web服务调用方式的分析,为Web服务的提供方设计了安全模型.所设计的模型不依赖于服务提供方选用的安全策略,方便策略的更改和安全检查机制的更新.该模型同样适用于Web服务的需求方. 相似文献
2.
This paper proposed a novel hybrid probabilistic network, which is a good tradeoff between the model complexity and learnability
in practice. It relaxes the conditional independence assumptions of Naive Bayes while still permitting efficient inference
and learning. Experimental studies on a set of natural domains prove its clear advantages with respect to the generalization
ability. 相似文献
3.
Bayazit Mahmut; Hammer Tove Helland; Wazeter David L. 《Canadian Metallurgical Quarterly》2004,89(4):738
Methodological problems in studies of union commitment were identified and illustrated with data from 4,641 members and 479 stewards in 297 local teachers' unions. Using a 20-item union commitment scale, results confirmed the existence of 3 substantive factors and 1 method factor at the individual level of analysis: loyalty to the union, responsibility to the union, willingness to work for the union, and a factor of negatively worded items. Tests of measurement invariance showed that the scale captured commitment for rank-and-file members but not for union stewards. The authors also found partial measurement invariance between long-time and newer members and full measurement invariance between men and women. Finally, the authors found that violation of the statistical assumption of independence reduced model fit when individual commitment scores were analyzed without attention to the hierarchical nature of the data. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
4.
5.
G. Dong 《Annals of Mathematics and Artificial Intelligence》1993,7(1-4):107-127
LDL is one of the recently proposed logical query languages, which incorporate set, for data and knowledge base systems. Since LDL programs can simulate negation, they are not monotonic in general. On the other hand, there are monotonic LDL programs. This paper addresses the natural question of “When are the generally nonmonotonic LDL programs monotonic?” and investigates related topics such as useful applications for monotonicity. We discuss four kinds of monotonicity, and examine two of them in depth. The first of the two, called “ω-monotonicity”, is shown to be undecidable even when limited to single-stratum programs. The second, called “uniform monotonicity”, is shown to implyω-monotonicity. We characterize the uniform monotonicity of a program (i) by a relationship between its Bancilhon-Khoshafian semantics and its LDL semantics, and (ii) with a useful property called subset completion independence. Characterization (ii) implies that uniformly monotonie programs can be evaluated more efficiently by discarding dominated facts. Finally, we provide some necessary and/or sufficient, syntactic conditions for uniform monotonicity. The conditions pinpoint (a) enumerated set terms, (b) negations of membership and inclusion, and (c) sharing of set terms as the main source for nonuniform monotonicity. 相似文献
6.
根据引信安全系统理论和状态空间分析方法,研究了引信安全系统的物理方程及其无量纲归一化方程的动态特性不变性,各保险要素之间的独立性,安全系统解除保险过程的时滞性和平衡态及其稳定性,并对这些性质给出了严格的定义。这些性质和定义为深入研究引信安全系统及其解除保险过程,提供了理论依据和有效方法。 相似文献
7.
This paper presents a segment-based probabilistic approach to robustly recognize continuous sign language sentences. The recognition strategy is based on a two-layer conditional random field (CRF) model, where the lower layer processes the component channels and provides outputs to the upper layer for sign recognition. The continuously signed sentences are first segmented, and the sub-segments are labeled SIGN or ME (movement epenthesis) by a Bayesian network (BN) which fuses the outputs of independent CRF and support vector machine (SVM) classifiers. The sub-segments labeled as ME are discarded and the remaining SIGN sub-segments are merged and recognized by the two-layer CRF classifier; for this we have proposed a new algorithm based on the semi-Markov CRF decoding scheme. With eight signers, we obtained a recall rate of 95.7% and a precision of 96.6% for unseen samples from seen signers, and a recall rate of 86.6% and a precision of 89.9% for unseen signers. 相似文献
8.
9.
《伸子》是以宫本百合子自身的美国留学经历为题材,描写了她自己从恋爱、结婚到离婚经历的自传性小说,被宫本百合子称作"自身的古典"。在这部小说中,伸子与母亲、伸子与丈夫佃、伸子与素子等人的关系错综交织在其中。而伸子真正的成长以及自立意识的深化,也就是在处理与这些人物关系过程中成立的。从三类人物关系着手,探寻其中伸子对自立,特别是精神自立的追求。在此基础上,从《伸子》的自传性出发,揭示了主人公和作者思想构造的内容。 相似文献
10.
左丹 《吉林建筑工程学院学报》2014,(4):96-98
场依存-场独立型认知风格能够影响学生的记忆、思考、学习、沟通等,而这些因素与大学英语学习有着紧密的联系。大学英语教学,主要就包括英语听力教学、英语阅读教学等多方面内容,本文主要分为三个部分,第一部分主要是针对场独立型与场依存型学生的特征分析;第二部分主要是对场依存-场独立型认知风格学生在英语学习中采用的不同教学方法;第三部分是对本文内容进行总结。 相似文献