全文获取类型
收费全文 | 2669篇 |
免费 | 57篇 |
国内免费 | 8篇 |
专业分类
电工技术 | 15篇 |
化学工业 | 344篇 |
金属工艺 | 29篇 |
机械仪表 | 30篇 |
建筑科学 | 21篇 |
能源动力 | 77篇 |
轻工业 | 110篇 |
水利工程 | 4篇 |
石油天然气 | 5篇 |
无线电 | 118篇 |
一般工业技术 | 298篇 |
冶金工业 | 1562篇 |
原子能技术 | 10篇 |
自动化技术 | 111篇 |
出版年
2024年 | 6篇 |
2023年 | 49篇 |
2022年 | 67篇 |
2021年 | 88篇 |
2020年 | 56篇 |
2019年 | 66篇 |
2018年 | 78篇 |
2017年 | 59篇 |
2016年 | 67篇 |
2015年 | 39篇 |
2014年 | 50篇 |
2013年 | 84篇 |
2012年 | 59篇 |
2011年 | 67篇 |
2010年 | 45篇 |
2009年 | 34篇 |
2008年 | 43篇 |
2007年 | 31篇 |
2006年 | 13篇 |
2005年 | 10篇 |
2004年 | 19篇 |
2003年 | 16篇 |
2002年 | 11篇 |
2001年 | 13篇 |
2000年 | 12篇 |
1999年 | 32篇 |
1998年 | 463篇 |
1997年 | 270篇 |
1996年 | 189篇 |
1995年 | 148篇 |
1994年 | 89篇 |
1993年 | 90篇 |
1992年 | 24篇 |
1991年 | 21篇 |
1990年 | 17篇 |
1989年 | 13篇 |
1988年 | 18篇 |
1987年 | 10篇 |
1986年 | 10篇 |
1985年 | 18篇 |
1984年 | 5篇 |
1983年 | 11篇 |
1982年 | 9篇 |
1981年 | 17篇 |
1980年 | 23篇 |
1979年 | 3篇 |
1978年 | 7篇 |
1977年 | 57篇 |
1976年 | 103篇 |
1968年 | 1篇 |
排序方式: 共有2734条查询结果,搜索用时 0 毫秒
1.
Wireless Personal Communications - Recently, the theory of effective rate has attracted much attention, since it can take the delay aspect into account when performing channel capacity analysis. In... 相似文献
2.
3.
Jain Amita Yadav Sudesh Vij Sonakshi Kumar Yogesh Tayal Devendra Kumar 《Wireless Personal Communications》2020,110(3):1303-1321
Wireless Personal Communications - Traffic network is basically a “network of networks” consisting of mainly two types of networks: road network and a travel network. Due to drastic... 相似文献
4.
D. Yadav 《Materials Science & Technology》2015,31(4):494-500
Copper particles were incorporated and retained in elemental state in an aluminium matrix by friction stir processing thereby producing a non-equilibrium particulate composite. The processed Al–Cup composite exhibited improved strength with significantly high ductility. The composite was stable up to a temperature of more than 300°C. Thermal exposure at 350°C for more than 10 min led to diffusion of Cu atoms into the Al matrix forming a core-shell type structure in the Cu particles and thus producing an Al–Cu core-shell composite. The shell consists of multiple layers, the thickness of which was controllable. 相似文献
5.
Multimedia Tools and Applications - In the way of communication, facial expression act as non-verbal communication and play an important role in social interaction by providing some contextual... 相似文献
6.
We characterize the meander of re-entrant excitation in a model of a sheet of mammalian ventricular tissue, and its control by resonant drift under feedback driven stimulation. The Oxsoft equations for excitability in a guinea pig single ventricular cell were incorporated in a two dimensional reaction-diffusion system to model homogeneous, isotropic tissue with a plane wave conduction velocity of 0.35 m s-1. Re-entrant spiral wave solutions have a spatially extended transient motion (linear core) that settles down into rotation with an irregular period of 100-110 ms around an irregular, multi-lobed spiky core. In anisotropic tissue this would appear as a linear conduction block. The typical velocity of drift of the spiral wave induced by low amplitude resonant forcing is 0.4 cm s-1. 相似文献
7.
SA Balakirev VI Tsygankin AV Ivanov VI Atroshchenko AN Ianovski? M Sarfundin 《Canadian Metallurgical Quarterly》1997,43(4):445-447
The report deals with the development of procedures, evaluation of laser application and prevention of complications involved in intensive chemoradiation therapy of neoplasms of hemopoietic and lymphoid tissue in childhood. The clinical data on 548 patients, aged 2 months-15 years, with leukemia and solid tumor were evaluated. Laser application for treatment of different complications of chemoradiation therapy of pediatric leukemia proved a valuable innovation. It had a pronounced antiinflammatory and analgetic effect, promoted tissue regeneration processes and cut down the duration of complication treatment drastically. 相似文献
8.
9.
AV Pensler 《Canadian Metallurgical Quarterly》1998,19(4):387-90, 392-4, 396; quiz 398
10.