全文获取类型
收费全文 | 524742篇 |
免费 | 7662篇 |
国内免费 | 1468篇 |
专业分类
电工技术 | 9559篇 |
综合类 | 526篇 |
化学工业 | 78656篇 |
金属工艺 | 19960篇 |
机械仪表 | 15190篇 |
建筑科学 | 12666篇 |
矿业工程 | 2269篇 |
能源动力 | 14516篇 |
轻工业 | 47054篇 |
水利工程 | 5219篇 |
石油天然气 | 9334篇 |
武器工业 | 37篇 |
无线电 | 59910篇 |
一般工业技术 | 101755篇 |
冶金工业 | 103499篇 |
原子能技术 | 10558篇 |
自动化技术 | 43164篇 |
出版年
2022年 | 3159篇 |
2021年 | 4892篇 |
2020年 | 3477篇 |
2019年 | 4554篇 |
2018年 | 7809篇 |
2017年 | 7607篇 |
2016年 | 7932篇 |
2015年 | 5559篇 |
2014年 | 9241篇 |
2013年 | 24065篇 |
2012年 | 14625篇 |
2011年 | 20142篇 |
2010年 | 15797篇 |
2009年 | 17693篇 |
2008年 | 18089篇 |
2007年 | 17775篇 |
2006年 | 15503篇 |
2005年 | 14208篇 |
2004年 | 13599篇 |
2003年 | 13397篇 |
2002年 | 12633篇 |
2001年 | 12830篇 |
2000年 | 11867篇 |
1999年 | 12594篇 |
1998年 | 32814篇 |
1997年 | 22896篇 |
1996年 | 17446篇 |
1995年 | 13033篇 |
1994年 | 11283篇 |
1993年 | 10972篇 |
1992年 | 7913篇 |
1991年 | 7417篇 |
1990年 | 7261篇 |
1989年 | 7013篇 |
1988年 | 6468篇 |
1987年 | 5766篇 |
1986年 | 5655篇 |
1985年 | 6265篇 |
1984年 | 5900篇 |
1983年 | 5170篇 |
1982年 | 4900篇 |
1981年 | 4966篇 |
1980年 | 4705篇 |
1979年 | 4609篇 |
1978年 | 4408篇 |
1977年 | 5335篇 |
1976年 | 6971篇 |
1975年 | 3796篇 |
1974年 | 3550篇 |
1973年 | 3665篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
35.
36.
37.
M. R. Thompson 《Drug development and industrial pharmacy》2015,41(8):1223-1231
Twin screw granulation (TSG) is a new process of interest to the pharmaceutical community that can continuously wet granulate powders, doing so at lower liquid concentrations and with better product consistency than found by a high shear batch mixer. A considerable body of research has evolved over the short time since this process was introduced but generally with little comparison of results. A certain degree of confidence has been developed through these studies related to how process variables and many attributes of machinery configuration will affect granulation but some major challenges still lay ahead related to scalability, variations in the processing regimes related to degree of channel fill and the impact of wetting and granulation of complex powder formulations. This review examines the current literature for wet granulation processes studied in twin screw extrusion machinery, summarizing the influences of operational and system parameters affecting granule properties as well as strives to provide some practical observations to newly interested users of the technique. 相似文献
38.
39.
Kazuo Tsubota Stephen C. Pflugfelder Zuguo Liu Christophe Baudouin Hyo Myung Kim Elisabeth M. Messmer Friedrich Kruse Lingyi Liang Jimena Tatiana Carreno-Galeano Maurizio Rolando Norihiko Yokoi Shigeru Kinoshita Reza Dana 《International journal of molecular sciences》2020,21(23)
Over the past decades, the number of patients with dry eye disease (DED) has increased dramatically. The incidence of DED is higher in Asia than in Europe and North America, suggesting the involvement of cultural or racial factors in DED etiology. Although many definitions of DED have been used, discrepancies exist between the various definitions of dry eye disease (DED) used across the globe. This article presents a clinical consensus on the definition of DED, as formulated in four meetings with global DED experts. The proposed new definition is as follows: “Dry eye is a multifactorial disease characterized by a persistently unstable and/or deficient tear film (TF) causing discomfort and/or visual impairment, accompanied by variable degrees of ocular surface epitheliopathy, inflammation and neurosensory abnormalities.” The key criteria for the diagnosis of DED are unstable TF, inflammation, ocular discomfort and visual impairment. This definition also recommends the assessment of ocular surface epitheliopathy and neurosensory abnormalities in each patient with suspected DED. It is easily applicable in clinical practice and should help practitioners diagnose DED consistently. This consensus definition of DED should also help to guide research and clinical trials that, to date, have been hampered by the lack of an established surrogate endpoint. 相似文献
40.