全文获取类型
收费全文 | 13306篇 |
免费 | 980篇 |
国内免费 | 508篇 |
专业分类
电工技术 | 674篇 |
综合类 | 685篇 |
化学工业 | 2319篇 |
金属工艺 | 688篇 |
机械仪表 | 816篇 |
建筑科学 | 904篇 |
矿业工程 | 335篇 |
能源动力 | 416篇 |
轻工业 | 758篇 |
水利工程 | 177篇 |
石油天然气 | 857篇 |
武器工业 | 72篇 |
无线电 | 1837篇 |
一般工业技术 | 1721篇 |
冶金工业 | 668篇 |
原子能技术 | 90篇 |
自动化技术 | 1777篇 |
出版年
2024年 | 44篇 |
2023年 | 226篇 |
2022年 | 359篇 |
2021年 | 525篇 |
2020年 | 346篇 |
2019年 | 309篇 |
2018年 | 346篇 |
2017年 | 384篇 |
2016年 | 362篇 |
2015年 | 494篇 |
2014年 | 668篇 |
2013年 | 809篇 |
2012年 | 781篇 |
2011年 | 947篇 |
2010年 | 791篇 |
2009年 | 723篇 |
2008年 | 764篇 |
2007年 | 692篇 |
2006年 | 751篇 |
2005年 | 671篇 |
2004年 | 429篇 |
2003年 | 362篇 |
2002年 | 298篇 |
2001年 | 276篇 |
2000年 | 276篇 |
1999年 | 396篇 |
1998年 | 356篇 |
1997年 | 269篇 |
1996年 | 258篇 |
1995年 | 184篇 |
1994年 | 176篇 |
1993年 | 116篇 |
1992年 | 100篇 |
1991年 | 67篇 |
1990年 | 58篇 |
1989年 | 37篇 |
1988年 | 29篇 |
1987年 | 9篇 |
1986年 | 23篇 |
1985年 | 7篇 |
1984年 | 14篇 |
1983年 | 7篇 |
1982年 | 16篇 |
1981年 | 9篇 |
1980年 | 8篇 |
1979年 | 5篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1975年 | 3篇 |
1974年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Hua Yu Zhengzhong Yang Luojun Du Jing Zhang Jinan Shi Wei Chen Peng Chen Mengzhou Liao Jing Zhao Jianling Meng Guole Wang Jianqi Zhu Rong Yang Dongxia Shi Lin Gu Guangyu Zhang 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(7)
Control of the precise lattice alignment of monolayer molybdenum disulfide (MoS2) on hexagonal boron nitride (h‐BN) is important for both fundamental and applied studies of this heterostructure but remains elusive. The growth of precisely aligned MoS2 domains on the basal plane of h‐BN by a low‐pressure chemical vapor deposition technique is reported. Only relative rotation angles of 0° or 60° between MoS2 and h‐BN basal plane are present. Domains with same orientation stitch and form single‐crystal, domains with different orientations stitch and from mirror grain boundaries. In this way, the grain boundary is minimized and a continuous film stitched by these two types of domains with only mirror grain boundaries is obtained. This growth strategy is also applicable to other 2D materials growth. 相似文献
102.
Markov chain Monte Carlo in Bayesian models for testing gamma and lognormal S-type process qualities
Mou-Yuan Liao 《国际生产研究杂志》2016,54(24):7491-7503
The process capability index Cpu is widely used to measure S-type process quality. Many researchers have presented adaptive techniques for assessing the true Cpu assuming normality. However, the quality characteristic is often abnormal, and the derived techniques based on the normality assumption could mislead the manager into making uninformed decisions. Therefore, this study provides an alternative method for assessing Cpu of non-normal processes. The Markov chain Monte Carlo, an emerging popular statistical tool, is integrated into Bayesian models to seek the empirical posterior distributions of specific gamma and lognormal parameters. Afterwards, the lower credible interval bound of Cpu can be derived for testing the non-normal process quality. Simulations show that the proposed method is adaptive and has good performance in terms of coverage probability. 相似文献
103.
104.
105.
Controlling Synergistic Oxidation Processes for Efficient and Stable Blue Thermally Activated Delayed Fluorescence Devices 下载免费PDF全文
106.
Blue OLEDs: Controlling Synergistic Oxidation Processes for Efficient and Stable Blue Thermally Activated Delayed Fluorescence Devices (Adv. Mater. 35/2016) 下载免费PDF全文
107.
108.
The influence of ~300-ns pulsed sliding surface discharges on supersonic airflow with M = 1.2–1.5 past a thin wedge has been studied in a shock tube at 0.12–0.14 kg/m3 gas density. It is established that inhomogeneity of the airflow-density field near the wedge leads to changes in the discharge current geometry and the structure of surface-discharge glow. The dynamics of discharge-initiated shock waves disturbing the quasi-stationary flow past the wedge was studied by the method of shadow visualization. It is shown that shock waves from intense surface-discharge channels in front of the wedge and behind its rear part can produce nonstationary action on the flow past the wedge surface, which lasts for up to 120 μs after the discharge pulse. 相似文献
109.
Zan Wu Zhang Qiaochu Xu Hu Liao Fuyou Guo Zhongxun Deng Jianan Wan Jing Zhu Hao Chen Lin Sun Qingqing Ding Shijin Zhou Peng Bao Wenzhong Zhang David Wei 《Nano Research》2018,11(7):3739-3745
Nano Research - A spin-coating method was applied to obtain thinner and smoother PEO/LiClO4 polymer electrolyte films (EFs) with a lower level of crystallization than those obtained using a... 相似文献
110.
Integrated-optic array illuminator: a new design for guided-wave optical interconnections 总被引:1,自引:0,他引:1
An integrated array illuminator can be used not only as an opticalpower distributor for an array of guided-wave optic devices but also asa key element for guided-wave optical interconnections. We presenta new design for an integrated-optic array illuminator with focusingwaveguide diffractive doublet arrays. This integrated arrayilluminator allows independent optimizations of efficient and uniformoptical power distribution and focusing performance. Furthermore, the device can be fabricated with all-optical lithographic technologyand hence has the advantages of mass production with lowcost. 相似文献