全文获取类型
收费全文 | 44977篇 |
免费 | 2716篇 |
国内免费 | 42篇 |
专业分类
电工技术 | 329篇 |
综合类 | 30篇 |
化学工业 | 8637篇 |
金属工艺 | 849篇 |
机械仪表 | 964篇 |
建筑科学 | 1427篇 |
矿业工程 | 83篇 |
能源动力 | 953篇 |
轻工业 | 6095篇 |
水利工程 | 408篇 |
石油天然气 | 205篇 |
武器工业 | 4篇 |
无线电 | 2626篇 |
一般工业技术 | 7845篇 |
冶金工业 | 10788篇 |
原子能技术 | 232篇 |
自动化技术 | 6260篇 |
出版年
2023年 | 402篇 |
2022年 | 528篇 |
2021年 | 1110篇 |
2020年 | 912篇 |
2019年 | 858篇 |
2018年 | 1699篇 |
2017年 | 1668篇 |
2016年 | 1753篇 |
2015年 | 1266篇 |
2014年 | 1615篇 |
2013年 | 3091篇 |
2012年 | 2663篇 |
2011年 | 2591篇 |
2010年 | 1996篇 |
2009年 | 1804篇 |
2008年 | 2012篇 |
2007年 | 1735篇 |
2006年 | 1310篇 |
2005年 | 1096篇 |
2004年 | 1017篇 |
2003年 | 907篇 |
2002年 | 787篇 |
2001年 | 521篇 |
2000年 | 506篇 |
1999年 | 657篇 |
1998年 | 3468篇 |
1997年 | 2085篇 |
1996年 | 1376篇 |
1995年 | 806篇 |
1994年 | 683篇 |
1993年 | 657篇 |
1992年 | 218篇 |
1991年 | 244篇 |
1990年 | 237篇 |
1989年 | 226篇 |
1988年 | 201篇 |
1987年 | 172篇 |
1986年 | 190篇 |
1985年 | 218篇 |
1984年 | 187篇 |
1983年 | 133篇 |
1982年 | 163篇 |
1981年 | 181篇 |
1980年 | 159篇 |
1979年 | 131篇 |
1978年 | 118篇 |
1977年 | 202篇 |
1976年 | 435篇 |
1975年 | 92篇 |
1973年 | 82篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
Thin Film Thermoelectric Metal–Organic Framework with High Seebeck Coefficient and Low Thermal Conductivity
下载免费PDF全文
![点击此处可从《Advanced materials (Deerfield Beach, Fla.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
35.
36.
Rodríguez-Pérez Ángel Mariano Pérez-Calañas Cinta Pulido-Calvo Inmaculada 《Water Resources Management》2021,35(6):1977-1990
Water Resources Management - This paper aims to evaluate the possibility of using non-utilized hydraulic energy in urban water distribution systems. For this purpose, the viability and possible... 相似文献
37.
Computer‐Interpretable Guidelines (CIGs) are the dominant medium for the delivery of clinical decision support, given the evidence‐based nature of their source material. Therefore, these machine‐readable versions have the ability to improve practitioner performance and conformance to standards, with availability at the point and time of care. The formalisation of Clinical Practice Guideline knowledge in a machine‐readable format is a crucial task to make it suitable for the integration in Clinical Decision Support Systems. However, the current tools for this purpose reveal shortcomings with respect to their ease of use and the support offered during CIG acquisition and editing. In this work, we characterise the current landscape of CIG acquisition tools based on the properties of guideline visualisation, organisation, simplicity, automation, manipulation of knowledge elements, and guideline storage and dissemination. Additionally, we describe the CompGuide Editor, a tool for the acquisition of CIGs in the CompGuide model for Clinical Practice Guidelines that also allows the editing of previously encoded guidelines. The Editor guides the users throughout the process of guideline encoding and does not require proficiency in any programming language. The features of the CIG encoding process are revealed through a comparison with already established tools for CIG acquisition. 相似文献
38.
Andrés Mario Zervigón 《History of Photography》2019,43(2):130-143
For decades now, Douglas Crimp’s landmark 1980 essay ‘The Photographic Activity of Postmodernism’ has shaped our understanding of modernism’s aftermath, at least as it unfolded in North America and Western Europe. Less remembered, however, is the degree to which the procedures of disjunction, copying, appropriation, and outright theft that he highlighted were epitomised not just by contemporary photography, but by photomontage in particular. This article recovers the debates that led critics such as Crimp, Abigail Solomon-Godeau, Christopher Phillips, Benjamin Buchloh and others to turn to photomontage as one of their principal objects of concern in what became known as the postmodern critique of photography. Why was montage tasked to perform this critical function, particularly by people around the journal October who had not otherwise devoted the balance of their writing to photography’s history? The article suggests that these men and women, along with the contemporary artists they foregrounded, manifested what Mary Anne Doane has called a ‘desire for signification’, a reaction in the late 1970s against the mute theatricality of minimalist and conceptual art. Photomontage reintroduced representation to contemporary art and to the canon of art history. But unlike the reemerging illusionism in painting that also manifested this desire, montage guarded against an uncomplicated realism by highlighting and critiquing operations of representation in a manner that painting no longer could. 相似文献
39.
Pierre Santucci Christina Dedaki Alexandros Athanasoulis Laura Gallorini Anaïs Munoz Dr. Stéphane Canaan Dr. Jean-François Cavalier Dr. Victoria Magrioti 《ChemMedChem》2019,14(3):349-358
In the quest for new antibacterial agents, a series of novel long- and medium-chain mono- and disubstituted β-lactones was developed. Their activity against three pathogenic mycobacteria—M. abscessus, M. marinum, and M. tuberculosis—was assessed by the resazurin microtiter assay (REMA). Among the 16 β-lactones synthesized, only 3-hexadecyloxetan-2-one (VM005) exhibited promising activity against M. abscessus, whereas most of the β-lactones showed interesting activities against M. marinum, similar to that of the classical antibiotic, isoniazid. Regarding M. tuberculosis, six compounds were found to be active against this mycobacterium, with β-lactone VM008 [trans-(Z)-3-(hexadec-7-en-1-yl)-4-propyloxetan-2-one] being the best growth inhibitor. The promising antibacterial activities of the best compounds in this series suggest that these molecules may serve as leads for the development of much more efficient antimycobacterial agents. 相似文献