全文获取类型
收费全文 | 10757篇 |
免费 | 1263篇 |
国内免费 | 676篇 |
专业分类
电工技术 | 258篇 |
技术理论 | 2篇 |
综合类 | 1475篇 |
化学工业 | 1914篇 |
金属工艺 | 155篇 |
机械仪表 | 458篇 |
建筑科学 | 1131篇 |
矿业工程 | 194篇 |
能源动力 | 86篇 |
轻工业 | 874篇 |
水利工程 | 329篇 |
石油天然气 | 91篇 |
武器工业 | 46篇 |
无线电 | 685篇 |
一般工业技术 | 897篇 |
冶金工业 | 1340篇 |
原子能技术 | 112篇 |
自动化技术 | 2649篇 |
出版年
2024年 | 52篇 |
2023年 | 180篇 |
2022年 | 517篇 |
2021年 | 550篇 |
2020年 | 334篇 |
2019年 | 326篇 |
2018年 | 298篇 |
2017年 | 356篇 |
2016年 | 405篇 |
2015年 | 456篇 |
2014年 | 637篇 |
2013年 | 718篇 |
2012年 | 660篇 |
2011年 | 670篇 |
2010年 | 620篇 |
2009年 | 590篇 |
2008年 | 627篇 |
2007年 | 688篇 |
2006年 | 682篇 |
2005年 | 625篇 |
2004年 | 486篇 |
2003年 | 413篇 |
2002年 | 288篇 |
2001年 | 255篇 |
2000年 | 153篇 |
1999年 | 124篇 |
1998年 | 102篇 |
1997年 | 82篇 |
1996年 | 66篇 |
1995年 | 55篇 |
1994年 | 52篇 |
1993年 | 56篇 |
1992年 | 41篇 |
1991年 | 36篇 |
1990年 | 36篇 |
1989年 | 30篇 |
1988年 | 25篇 |
1987年 | 23篇 |
1986年 | 34篇 |
1985年 | 28篇 |
1984年 | 30篇 |
1983年 | 28篇 |
1982年 | 17篇 |
1981年 | 19篇 |
1959年 | 16篇 |
1958年 | 14篇 |
1957年 | 22篇 |
1956年 | 16篇 |
1955年 | 25篇 |
1954年 | 14篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
No authorship indicated 《Canadian Metallurgical Quarterly》2006,61(8):811
Presents the citation for Anthony D. Wagner, who received the Award for Distinguished Scientific Early Career Contributions to Psychology (cognition and human learning) "for outstanding and innovative research on the neural basis of memory and executive control." A brief profile and a selected bibliography accompany the citation. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
32.
A stochastic model is proposed for a basic mechanism in the formation of uncertainties in physical quantity measurements.
__________
Translated from Izmeritel'naya Tekhnika, No. 1, pp. 12–17, January, 2006. 相似文献
33.
In this response to Jeffrey Stern's (2004) (see record 2004-21113-016) commentary on my article, "Giving the Devil His Due: Spite and the Struggle for Individual Dignity" (P. Shabad, 2000) (see record 2000-00917-004), I suggest that in emphasizing the conscious vindictiveness of explicit spite, Stern minimizes the perverse aspects of "cutting off one's nose to spite one's face" as a means of avenging oneself against powerful others. The underlying impetus of perverse spite is to break free from the prison of subtle developmental contingencies and unconscious seductions surrounding maternal possessiveness. When the child's self-assertive strivings are blocked because of the shame and fear of premature separateness, the inward obsessional churning of resentment becomes a fertile ground for perverse spite. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
34.
A nonlinear stress-strain relationship of soil reinforced with flexible geofibers under static loading is derived based on a nonlinear elastic stress-strain relationship of soil and a linear elastic stress-strain relationship of geofibers in the paper. This investigation includes the following aspects: First, the homogenization technique is introduced to find the volume average stress tensor and volume average strain tensor and further an elastic incremental stress-strain relation is introduced to describe deviatoric shear stress-axial strain relationship of equivalent homogeneous geofiber-reinforced soil. Second, the relation of geofiber numbers, content, mechanical behavior, distribution, and geometrical features to shear modulus of geofiber-reinforced soil is expressed and assessed by employing an elastic energy method. Third, the deviatoric shear stress and axial strain curves of geofiber-reinforced soil are calibrated by laboratory testing data of geofiber reinforced soil samples. Finally, the theoretical computational curves of geofiber reinforced soil are compared with the curves calibrated by testing data of geofiber reinforced soil. The model prediction has a good agreement with experimental results. 相似文献
35.
人类聚居环境学对于居住区规划设计的启示 总被引:1,自引:0,他引:1
以人类聚居环境学的研究方法从若干方面对目前的居住区规划设计进行了一定的探讨,分析规划设计及建设方面目前存在的主要问题,提出以人类聚居环境学为指导的居住区规划设计理念。 相似文献
36.
良好的企业形象是竞争取胜的利器,内部公关是塑造良好企业形象的根本手段。本文阐述了企业内部公关对塑造良好企业形象的重要意义,探讨了实施内部公关的主要途径。 相似文献
37.
刘永增 《石油化工管理干部学院学报》2003,(2):58-59
阐述了人力资源管理在企业发展中的重要作用;对如何引入竞争机制、知人善任、建立科学的激励机制和约束机制、改革管理体制等方面进行了论述。 相似文献
38.
Yongxian Zhao Baochen Huang Wei Yao Hailin Cong Huafeng Shao Aihua Du 《应用聚合物科学杂志》2008,107(5):2986-2993
A new organic‐solvent‐free water‐phase suspension method was used to synthesize partially epoxidized high trans‐1,4‐polyisoprene (TPI) to improve its properties, including oil resistance and wet‐skid resistance. The epoxidation was conducted in an aqueous peracetic acid solution and on the TPI granules prepared by a bulk precipitation method with supported titanium catalyst. The effects of the synthesis conditions, including reaction temperature, reaction time, and pH value, on the epoxy content were investigated. Epoxidized trans‐1,4‐polyisoprene (ETPI) with epoxy contents between 10 and 80% were obtained within 4 h. Both the amorphous and crystalline regions of TPI were epoxidized. The crystallization properties decreased with increasing epoxy content. ETPIs possessed lower mechanical properties than TPI but could be enhanced by vulcanization. The oil resistance and wet‐skid resistance were significantly improved after epoxidation. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
39.
田葵 《河南机电高等专科学校学报》2004,12(6):89-90
《聊斋志异》中的《青娥》一篇充满了浓郁的童话色彩,贯穿主人公爱情生活的始终是纯洁执着的赤子情怀,爱情充满了青春的芬芳和清新的童趣,而波折和迂回中始终不离主人公的至情和至孝。 相似文献
40.