全文获取类型
收费全文 | 171938篇 |
免费 | 13697篇 |
国内免费 | 7134篇 |
专业分类
电工技术 | 8668篇 |
技术理论 | 5篇 |
综合类 | 11155篇 |
化学工业 | 29421篇 |
金属工艺 | 9047篇 |
机械仪表 | 11209篇 |
建筑科学 | 10374篇 |
矿业工程 | 2927篇 |
能源动力 | 5384篇 |
轻工业 | 13789篇 |
水利工程 | 2868篇 |
石油天然气 | 5462篇 |
武器工业 | 1013篇 |
无线电 | 22677篇 |
一般工业技术 | 23982篇 |
冶金工业 | 9098篇 |
原子能技术 | 2285篇 |
自动化技术 | 23405篇 |
出版年
2024年 | 487篇 |
2023年 | 2058篇 |
2022年 | 3834篇 |
2021年 | 5574篇 |
2020年 | 4165篇 |
2019年 | 3883篇 |
2018年 | 4321篇 |
2017年 | 4679篇 |
2016年 | 4984篇 |
2015年 | 5875篇 |
2014年 | 7987篇 |
2013年 | 10148篇 |
2012年 | 11293篇 |
2011年 | 12686篇 |
2010年 | 11088篇 |
2009年 | 10849篇 |
2008年 | 10732篇 |
2007年 | 9790篇 |
2006年 | 9588篇 |
2005年 | 8103篇 |
2004年 | 6604篇 |
2003年 | 6140篇 |
2002年 | 6774篇 |
2001年 | 5765篇 |
2000年 | 4371篇 |
1999年 | 3577篇 |
1998年 | 3435篇 |
1997年 | 2572篇 |
1996年 | 2245篇 |
1995年 | 1828篇 |
1994年 | 1460篇 |
1993年 | 1157篇 |
1992年 | 861篇 |
1991年 | 722篇 |
1990年 | 606篇 |
1989年 | 486篇 |
1988年 | 436篇 |
1987年 | 319篇 |
1986年 | 208篇 |
1985年 | 200篇 |
1984年 | 159篇 |
1983年 | 106篇 |
1982年 | 78篇 |
1981年 | 78篇 |
1980年 | 64篇 |
1979年 | 53篇 |
1978年 | 39篇 |
1977年 | 49篇 |
1976年 | 84篇 |
1975年 | 32篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
Personality is an essential feature for creating socially interactive robots. Studies on this dimension will facilitate enhanced human–robot interaction (HRI). Using AIBO, a social robotic pet developed by Sony, we examined the issue of personality in HRI. In this gender-balanced 2 (AIBO personality: introvert vs. extrovert) by 2 (participant personality: introvert vs. extrovert) between-subject experiment (N = 48), we found that participants could accurately recognize a robot's personality based on its verbal and nonverbal behaviors. In addition, various complementarity attraction effects were found in HRI. Participants enjoyed interacting with a robot more when the robot's personality was complementary to their own personalities than when the robot's personality was similar to their own personalities. The same complementarity attraction effect was found in participants' evaluation of the robot's intelligence and social attraction. Participants' feelings of social presence during the interaction were a significant mediator for the complementarity attraction effects observed. Practical and theoretical implications of the current study for the design of social robots and the study of HRI were discussed. 相似文献
992.
993.
Activated nanostructured-carbon cloths with a high ratio of surface area to volume are used as electrode for capacitive deionization. The electrochemical properties on capacitive deionization for NaCl solution have been investigated to improve efficiency of capacitive deionization properties from aqueous solution, employing chemical surface-modification by etching in alkaline and acidic solution. The removal efficiency of inorganic salts of activated carbon cloths by chemical modification significantly increased. Specially the carbon cloth surface modified in HNO3 showed an effect of improvement in the CDI efficiency due to not only ion adsorption by an electric double layer, but also electron transfer by Faradaic reaction. 相似文献
994.
An impedance matching technique using series condensers for the power receivers of in vivo robotic capsules is proposed. The power delivery function of the condenser ratio and its optimal ratio are derived. Experimental results validate the derived function. 相似文献
995.
通过改变高速车削淬火钢(Cr12)的切削用量,对切削力、切削温度、加工表面质量等进行了研究,结果表明合理选择切削用量,高速硬车削淬火钢可显著提高生产率及加工表面质量,并在一定程度上可取代磨削加工。 相似文献
996.
997.
998.
Moonsoo Kang Jeonghoon Mo Seong-Lyun Kim 《Communications Letters, IEEE》2005,9(11):1018-1020
The loss recovery architecture of TCP under wireless environment is considered. We propose sent-time ordered two lists architecture as an alternative to sequence number ordered single list architecture. By keeping the sent-time order, the recovery mechanism can be more efficient and-simpler and transmission decision is decoupled from loss recovery using the second list. Simulation results show the superiority of our mechanism. 相似文献
999.
基于小波分析的车型识别 总被引:4,自引:0,他引:4
靳敏 《电子测量与仪器学报》2003,17(2):31-34,60
本文论述了用小波分析提取车辆图像边缘信号的方法,得到了连续、光滑的边缘图像,并将其应用于公路车辆车型的检测与识别系统中,实验表明识别过程准确、速度快,具有较好的应用前景。 相似文献
1000.
Deborah C. Blaine John D. Gurosik Seong Jin Park Randall M. German Donald F. Heaney 《Metallurgical and Materials Transactions A》2006,37(3):715-720
Sintering experiments with various molybdenum powders are rationalized using a master sintering curve concept that collapses
density, grain size, or other parameters onto a single curve. In this case, the integral work of sintering is developed and
customized for different green densities. Construction of the master sintering curve is described to show how the curve can
be normalized with respect to green density effects. Various grades of molybdenum for metal injection molding and die compaction
are included in the analysis, processed over a range of heating cycles. Die-compacted samples of varying green densities are
used to illustrate the efficacy of the new, normalized master sintering curve concept. Sintering cycle optimization is one
possible outcome from this analysis. 相似文献