全文获取类型
收费全文 | 10539篇 |
免费 | 823篇 |
国内免费 | 271篇 |
专业分类
系统科学 | 1260篇 |
丛书文集 | 161篇 |
教育与普及 | 121篇 |
理论与方法论 | 290篇 |
现状及发展 | 882篇 |
研究方法 | 12篇 |
综合类 | 8905篇 |
自然研究 | 2篇 |
出版年
2024年 | 23篇 |
2023年 | 56篇 |
2022年 | 93篇 |
2021年 | 94篇 |
2020年 | 57篇 |
2019年 | 21篇 |
2018年 | 753篇 |
2017年 | 780篇 |
2016年 | 475篇 |
2015年 | 148篇 |
2014年 | 135篇 |
2013年 | 121篇 |
2012年 | 403篇 |
2011年 | 1134篇 |
2010年 | 953篇 |
2009年 | 639篇 |
2008年 | 733篇 |
2007年 | 986篇 |
2006年 | 186篇 |
2005年 | 264篇 |
2004年 | 264篇 |
2003年 | 288篇 |
2002年 | 189篇 |
2001年 | 168篇 |
2000年 | 144篇 |
1999年 | 294篇 |
1998年 | 308篇 |
1997年 | 316篇 |
1996年 | 263篇 |
1995年 | 230篇 |
1994年 | 206篇 |
1993年 | 178篇 |
1992年 | 155篇 |
1991年 | 146篇 |
1990年 | 121篇 |
1989年 | 106篇 |
1988年 | 86篇 |
1987年 | 69篇 |
1986年 | 24篇 |
1985年 | 16篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1981年 | 2篇 |
1967年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
船体高谐调振动固有频率的估算 总被引:1,自引:1,他引:0
本文提出三谐调至五谐调主船体垂向和水平方向振动的固有频率估算的几个新公 式.这些公式是以实船激振试验时获得的固有频率为基础,采用线性回归的方法推导 出来的。这些公式特别适用于船舶设计的初始阶段。它不仅可用于普通强度钢材料建 造的船舶.而且也适用于中部区域内的主要构件采用高强度钢材料建造的船舶. 相似文献
992.
993.
Soft Systems Methodology is especially useful in diagnosing and addressing organizational problems and designing new systems
in cultures that are characterised by pluralistic views and values. This paper demonstrates how SSM workshops in a large government
agency resulted in a high level of creativity. SSM is then proposed as a methodology that could enhance group creativity in
organizational design contexts. 相似文献
994.
Frank Stowell 《Systemic Practice and Action Research》2007,20(5):413-427
Increasingly knowledge has become a determining factor in achieving life’s potential and is the currency of the age. Without
access to Information an individuals’ knowledge base cannot be enriched and without knowledge the individual becomes increasingly
powerless. Advances in technology have provided opportunities for some to add to their stock of knowledge but access to sources
of information is uneven and can lead to social unrest. The availability of information is an important factor in managing
change and empowering citizens. The question about information and power then becomes one of ownership or sovereignty of the
information. If we are to create an open society then we need to ensure that there is open access to knowledge through flexible
and intelligent information systems that are available for all. In this paper we consider if we are truly entering the knowledge
age or the age of ignorance. 相似文献
995.
LIANG Yan ZUO JianRu YANG WeiCai 《科学通报(英文版)》2007,52(13):1729-1733
Arabidopsis thaliana, a model plant species, has a number of advantages over other plant species as an experimental organism due to many of its genetic and genomic features. The Chinese Arabidopsis community has made significant contributions to plant biology research in recent years[1,2]. In 2006, studies of plant biology in China received more attention than ever before, especially those pertaining to Arabidopsis research. Here we briefly summarize recent advances in Arabidopsis re-search in China. 相似文献
996.
LU Zhengding WEN Zhumu TANG Zhuo LI Ruixuan 《武汉大学学报:自然科学英文版》2007,12(5):955-960
This paper proposes a method to formalize the interoperation in multi-domain environment. Through employing the algebra method, we conclude four types of the conflicts for the interoperation, and analyzes the cause of the policy conflicts. For each type of conflicts, we formalize it and proposes the method of detection and resolution. Finally, the method is illuminated be effective through comparing our work with others. 相似文献
997.
研究试验的滴灌自控系统,用于农田、果园、塑料大棚、温室及草坪绿地灌水,根据果树物候期的生长需要,可实现果园科学自动给水。本系统采用真空表张力计和光导纤维传感器,可做为普及推广滴灌和喷灌的配套设备。 相似文献
998.
本文考虑Banach空间中带约束的极值问题(P),通过引入容许集合的高阶逼近,首次建立了无限维空间上优化问题(P)的高于三阶的最优性充分条件,并概括了〔1,3,5,6,7〕中的极值问题最优性充分条件的二阶结果。 相似文献
999.
Electrophysiological studies have utilized event-related brain potentials (ERPs) to investigate neural processes related to the evaluation of the outcome of behavioral performance or to the evaluation of external feedback. The feedback-related negativity (FRN) in brain potentials has been shown to be sensitive to information indicating monetary loss or negative feedback. Since monetary loss usually indicates both the consequence of previous performance and the reward value of stimuli, it is controversial whether the FRN reflects the cognitive process of error detection per se and/or the motivational/affective process related to the subjective evaluation of the error. This study manipulated the motivational/affective significance of negative feedback by penalizing errors in a context-dependent way in a line judgment task. Participants could lose more money in the loss incentive condition or win less money in the win incentive condition if their subsequent judgment of line segments was less accurate, whereas they could receive performance feedback but without monetary incentive in the neutral condition. Results showed that the size of the FRN effect as well as the size of the P300 effect, as assessed by comparing brain responses to the error trials with the responses to the correct trials, increased linearly over the loss, neutral, and win conditions, suggesting that the FRN is sensitive to the motivational/affective evaluation of the performance outcome. 相似文献
1000.
罗传伟 《河南科技大学学报(自然科学版)》1989,(4)
重点介绍科技日语中被动句的种类,并通过例句分析各种被动句的特点以及翻译技巧。同时,还剖析了科技日语中形态相似的自发句与被动句的区别。 相似文献