全文获取类型
收费全文 | 4303篇 |
免费 | 260篇 |
国内免费 | 12篇 |
专业分类
电工技术 | 40篇 |
综合类 | 4篇 |
化学工业 | 1218篇 |
金属工艺 | 125篇 |
机械仪表 | 88篇 |
建筑科学 | 156篇 |
矿业工程 | 6篇 |
能源动力 | 140篇 |
轻工业 | 442篇 |
水利工程 | 18篇 |
石油天然气 | 4篇 |
无线电 | 418篇 |
一般工业技术 | 864篇 |
冶金工业 | 211篇 |
原子能技术 | 72篇 |
自动化技术 | 769篇 |
出版年
2023年 | 33篇 |
2022年 | 80篇 |
2021年 | 117篇 |
2020年 | 78篇 |
2019年 | 73篇 |
2018年 | 111篇 |
2017年 | 128篇 |
2016年 | 115篇 |
2015年 | 114篇 |
2014年 | 177篇 |
2013年 | 299篇 |
2012年 | 263篇 |
2011年 | 382篇 |
2010年 | 268篇 |
2009年 | 261篇 |
2008年 | 265篇 |
2007年 | 195篇 |
2006年 | 205篇 |
2005年 | 156篇 |
2004年 | 126篇 |
2003年 | 126篇 |
2002年 | 120篇 |
2001年 | 65篇 |
2000年 | 62篇 |
1999年 | 68篇 |
1998年 | 76篇 |
1997年 | 69篇 |
1996年 | 58篇 |
1995年 | 38篇 |
1994年 | 45篇 |
1993年 | 45篇 |
1992年 | 25篇 |
1991年 | 24篇 |
1990年 | 25篇 |
1989年 | 22篇 |
1988年 | 20篇 |
1987年 | 16篇 |
1986年 | 21篇 |
1985年 | 13篇 |
1984年 | 19篇 |
1983年 | 16篇 |
1982年 | 17篇 |
1981年 | 18篇 |
1980年 | 12篇 |
1979年 | 17篇 |
1978年 | 14篇 |
1977年 | 12篇 |
1976年 | 19篇 |
1975年 | 11篇 |
1974年 | 10篇 |
排序方式: 共有4575条查询结果,搜索用时 125 毫秒
1.
2.
The Journal of Supercomputing - Infrastructure-as-a-service container-based virtualization is gaining interest as a platform for running distributed applications. With increasing scale of cloud... 相似文献
3.
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
4.
Daniela Frasca Maria Romero Alain Diaz Denisse Garcia Seth Thaller Bonnie B. Blomberg 《International journal of molecular sciences》2021,22(4)
Senescent cells accumulate in the adipose tissue (AT) of individuals with obesity and secrete multiple factors that constitute the senescence-associated secretory phenotype (SASP). This paper aimed at the identification of B cells with a SASP phenotype in the AT, as compared to the peripheral blood, of individuals with obesity. Our results show increased expression of SASP markers in AT versus blood B cells, a phenotype associated with a hyper-metabolic profile necessary to support the increased immune activation of AT-derived B cells as compared to blood-derived B cells. This hyper-metabolic profile is needed for the secretion of the pro-inflammatory mediators (cytokines, chemokines, micro-RNAs) that fuel local and systemic inflammation. 相似文献
5.
Load testing of applications is an important and costly activity for software provider companies. Classical solutions are very difficult to set up statically, and their cost is prohibitive in terms of both human and hardware resources. Virtualized cloud computing platforms provide new opportunities for stressing an application's scalability, by providing a large range of flexible and less expensive (pay‐per‐use model) computation units. On the basis of these advantages, load testing solutions could be provided on demand in the cloud. This paper describes a Benchmark‐as‐a‐Service solution that automatically scales the load injection platform and facilitates its setup according to load profiles. Our approach is based on: (i) virtualization of the benchmarking platform to create self‐scaling injectors; (ii) online calibration to characterize the injector's capacity and impact on the benched application; and (iii) a provisioning solution to appropriately scale the load injection platform ahead of time. We also report experiments on a benchmark illustrating the benefits of this system in terms of cost and resource reductions. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
6.
Lai-Ying Leong Teck-Soon Hew Keng-Boon Ooi Alain Yee Loong Chong Voon-Hsien Lee 《Information & Management》2021,58(2):103416
This paper examines what influences trust in mobile social commerce environment. Drawing on trust-based acceptance model (i.e. cognitive and emotional trust) and online review features (i.e. profile photo, linguistic style, and reported experience), we examine how these factors affect trust in mobile social commerce. Hypotheses were tested using survey data. The results of our model showed that there are significant influences of profile photo, reported experience, cognitive, and emotional trust towards trust in ms-commerce. This work contributes to existing literature by examining the roles of previous trust in mobile payments and online reviews on trust in mobile social commerce. 相似文献
7.
Igboamalu Frank Nonso Ndjiongue Alain Richard Ferreira Hendrik Christoffel 《Telecommunication Systems》2020,73(4):521-530
Telecommunication Systems - Signals from indoor access points in a wireless fidelity suffer from high attenuation as a result of the thick walls and metal structures in the multilevel-storey... 相似文献
8.
Désiré Lara; Veissier Isabelle; Després Gérard; Boissy Alain 《Canadian Metallurgical Quarterly》2004,118(4):363
Appraisal theories provide a framework that gives insight into emotions and could allow comparisons across species. According to these theories, events are first evaluated on their suddenness, novelty, and unpredictability. The authors examined the ability of lambs (Ovis aries) to evaluate an event according to these 3 criteria through 3 tests. The lambs responded to suddenness with a startle response coupled with an increase in heart rate and to novelty with an orientation response coupled with an increase of vagal activity. There was no clear evidence that lambs can detect the predictability of an event. Those results support the usefulness of appraisal theories to assess emotion in animals. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
9.
Jean-Louis Havet Myriam Billiau-Loreau Catherine Porte Alain Delacroix 《Journal of Automated Methods and Management in Chemistry》2002,24(4):111-119
Chemometric tools were used to generate the modelling of solvent e inverted exclamation markects on the N-alkylation of an isocyanuric acid salt. The method proceeded from a central composite design applied on the Carlson solvent classification using principal components analysis. The selectivity of the reaction was studied from the production of different substituted isocyanuric derivatives. Response graphs were obtained for each compound and used to devise a strategy for solvent selection. The prediction models were validated and used to search for the best selectivity for the reaction system. The solvent most often selected as the best for the reaction is the N,N-dimethylformamide. 相似文献
10.