全文获取类型
收费全文 | 3402篇 |
免费 | 254篇 |
国内免费 | 201篇 |
专业分类
电工技术 | 59篇 |
技术理论 | 2篇 |
综合类 | 590篇 |
化学工业 | 148篇 |
金属工艺 | 6篇 |
机械仪表 | 65篇 |
建筑科学 | 267篇 |
矿业工程 | 18篇 |
能源动力 | 11篇 |
轻工业 | 402篇 |
水利工程 | 9篇 |
石油天然气 | 30篇 |
武器工业 | 6篇 |
无线电 | 310篇 |
一般工业技术 | 446篇 |
冶金工业 | 509篇 |
原子能技术 | 3篇 |
自动化技术 | 976篇 |
出版年
2024年 | 12篇 |
2023年 | 53篇 |
2022年 | 80篇 |
2021年 | 97篇 |
2020年 | 107篇 |
2019年 | 92篇 |
2018年 | 74篇 |
2017年 | 55篇 |
2016年 | 110篇 |
2015年 | 89篇 |
2014年 | 203篇 |
2013年 | 222篇 |
2012年 | 228篇 |
2011年 | 282篇 |
2010年 | 290篇 |
2009年 | 291篇 |
2008年 | 261篇 |
2007年 | 243篇 |
2006年 | 233篇 |
2005年 | 194篇 |
2004年 | 137篇 |
2003年 | 119篇 |
2002年 | 103篇 |
2001年 | 54篇 |
2000年 | 48篇 |
1999年 | 32篇 |
1998年 | 30篇 |
1997年 | 17篇 |
1996年 | 11篇 |
1995年 | 12篇 |
1994年 | 9篇 |
1993年 | 7篇 |
1992年 | 6篇 |
1991年 | 8篇 |
1989年 | 3篇 |
1988年 | 6篇 |
1987年 | 4篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1967年 | 1篇 |
1966年 | 2篇 |
1965年 | 2篇 |
1964年 | 1篇 |
1962年 | 3篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1959年 | 2篇 |
1958年 | 1篇 |
1955年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有3857条查询结果,搜索用时 15 毫秒
1.
2.
在社会转型期,面对日益激烈的市场竞争环境,如何制定民办高效发战战略,引导民办高效的可持续发展,是关系到民办高校兴衰的关键。本文主要从民办高校品牌战略入手,对社会转型及高等教育转型进行论述,并对如何加强民办高校品牌建设进行探讨。 相似文献
3.
Zk线性码的对称形式的MacWilliams恒等式 总被引:8,自引:2,他引:6
该文定义了Zk线性码的码字的对称重量计数公式,利用离散的Hadamard变换,建立了线性码与其对偶码之间的对称形式的MacWilliams恒等式. 相似文献
4.
中国电信企业经过多年的高速发展,逐渐步入成熟期,增长率下降、利润降低将是必然趋势,因此目前亟需探索新的运营模式,向综合型全业务电信运营商的方向发展。法国电信集团历史悠久,市场转型起步早.其发展经验有许多地方值得借鉴,包括法国电信集团具有特色的品牌战咯、灵活的经营模式、为企业提供全方位服务的经营手段。中国电信企业应积极开展全业务经营,加快发展企业网市场,完善合作运营模式,争取早日走向世界。 相似文献
5.
IKE协议的安全性分析 总被引:1,自引:0,他引:1
在简略介绍IKE协议RFC2409工作机制的基础上,对协议现有的安全问题进行了分析,并针对协议阶段1中主模式与积极模式下身份保护存在的问题提出了协议修改建议,对阶段1中安全联盟建立的可靠性进行了探讨以加强协议抵御DoS攻击的能力。 相似文献
6.
7.
Racial and ethnic identity development have been important topics in counseling psychology research for the last four decades. At present, however, there appears to be some confusion and debate regarding the quality of theory and measurement in the topical area. The present article serves as an introduction to this Journal of Counseling Psychology special section on "Racial and Ethnic Identity in Counseling Psychology: Conceptual and Methodological Challenges and Proposed Solutions." A rationale is provided for the special section, the place of racial and ethnic identity scholarship is located within the history of multicultural counseling research, and the invited special section contributions by K. O. Cokley (2007), J. E. Helms (2007), J. E. Trimble (2007), S. M. Quintana (2007), J. S. Phinney and A. D. Ong (2007), and J. G. Ponterotto and J. Park-Taylor (2007) are introduced. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
8.
Comments on the article "A house divided? The psychology of red and blue America" by D. C. Seyle and M. L. Newman (see record 2006-11202-001). Seyle and Newman concluded that the red and blue metaphor is inaccurate and proposed a purple America strategy to better convey that the majority of people do not align themselves with political extremes. There is interdisciplinary agreement on this. Although not cited by Seyle and Newman, the findings by Professor Fiorina of Stanford University were reported by the APA Monitor on Psychology in its coverage of the 2005 APA State Leadership Conference (Murray Law, 2005). In contrast to their social psychological analysis, Seyle and Newman were incorrect in concluding that "[a]s psychologists, we are not in a position to change either the elements of the American political system that may spur this conflict or even the decisions made by pundits, politicians, and reporters about the terms they choose to use in political discussion" (p. 579). (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
9.
The vicissitudes of the Israeli-Palestinian peace process since 1967 are analyzed using attitudes and related concepts where relevant. The 1967 war returned the two peoples' zero-sum conflict around national identity to its origin as a conflict within the land both peoples claim. Gradually, new attitudes evolved regarding the necessity and possibility of negotiations toward a two-state solution based on mutual recognition, which became the building stones of the 1993 Oslo agreement. Lacking a commitment to a final outcome, the Oslo-based peace process was hampered by reserve options, which increased avoidance at the expense of approach tendencies as the parties moved toward a final agreement. The resulting breakdown of the process in 2000 produced clashing narratives, reflecting different anchors for judgment and classical mirror images. Public support for violence increased, even as public opinion continued to favor a negotiated two-state solution. Reviving the peace process requires mutual reassurance about the availability of a partner for negotiating a principled peace based on a historic compromise that meets the basic needs and validates the identities of both peoples. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
10.
Responds to the comments by L. T. Hoshmand (see record 2003-08988-012) and J. Aros (see record 2003-08988-013) on the article by J. Arnett (see record 2002-18352-003) regarding the psychology of globalization. In this response, Arnett discusses the moral implications of globalization. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献