全文获取类型
收费全文 | 551篇 |
免费 | 17篇 |
学科分类
工业技术 | 568篇 |
出版年
2023年 | 4篇 |
2022年 | 38篇 |
2021年 | 35篇 |
2020年 | 7篇 |
2019年 | 12篇 |
2018年 | 15篇 |
2017年 | 15篇 |
2016年 | 19篇 |
2015年 | 9篇 |
2014年 | 27篇 |
2013年 | 43篇 |
2012年 | 21篇 |
2011年 | 27篇 |
2010年 | 21篇 |
2009年 | 14篇 |
2008年 | 16篇 |
2007年 | 18篇 |
2006年 | 15篇 |
2005年 | 23篇 |
2004年 | 13篇 |
2003年 | 11篇 |
2002年 | 6篇 |
2001年 | 5篇 |
2000年 | 9篇 |
1999年 | 6篇 |
1998年 | 37篇 |
1997年 | 30篇 |
1996年 | 24篇 |
1995年 | 10篇 |
1994年 | 10篇 |
1993年 | 6篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1975年 | 3篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1970年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有568条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
Gennaro?Della?Vecchia Luigi?GalloEmail author Massimo?Esposito Antonio?Coronato 《Multimedia Tools and Applications》2012,59(1):341-362
In healthcare facilities most of the daily activities require strict coordination between clinicians, who often operate under
heavy workloads and minimal workforce conditions in environments filled with increasingly complex technology. Ubiquitous Computing
applications constitute a suitable solution for both reducing medical costs and improving patient safety by better supporting
clinical processes. In this study we introduce an intelligent infrastructure for smart hospitals which implements basic services
to optimize medical staff/patient interactions and grants ubiquitous and transparent access to clinical data stored in standard
clinical databases. This infrastructure relies on the integration of Radio Frequency IDentification (RFID) and photosensor
technologies to identify, locate and track clinicians and patients equipped with mobile devices and wearable RFID tags. 相似文献
5.
Numerical and approximate analytical solutions for salt concentration polarization in hyperfiltration with laminar flow in a flat sheet configuration are presented. The analysis accounts for the variation of the water flux in the longitudinal direction. Approximate solutions were obtained with an integral method which was found to provide good agreement with the numerical solution. The integral method allows one to obtain closed expressions for the productivity Q, the recovery R and the efficiency E of a reverse osmosis system which can be applied relatively quickly in design calculations.In this analysis the physical properties of the solution are taken to be constant. 相似文献
6.
Aniello Leonardo Halak Basel Chai Peter Dhall Riddhi Mihalea Mircea Wilczynski Adrian 《International Journal of Information Security》2021,20(3):445-460
International Journal of Information Security - The complexity of today’s integrated circuit (IC) supply chain, organised in several tiers and including many companies located in different... 相似文献
7.
A solid state bonding technique under hot pressing was used for joining alumina with thin metal sheets of Ni, Cu and Fe. The microstructure and microchemistry of the ceramic–metal interface and of the fracture interface were examined using scanning electron microscopy (SEM) energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), in order to identify the adhesion mechanisms and the nature of strength limiting flaws. Interaction between the selected metals and alumina can be physical or physico-chemical in nature: very low amounts of interfacial compounds were formed, depending on the processing conditions and on the presence of oxygen in the system. Fracture and toughness tests indicated that high ceramic–metal interface strengths (up to 177 MPa) were achieved under the adopted processing conditions and that strength and toughness were directly related. Moreover, an increase in hardening in the metal interlayer at a distance of 2–3 m from the interface was observed in the samples with high strength values. The mechanical behaviour was related to several factors that strongly depend on the bonding conditions: plastic deformation of the metal, metal creep, metal intrusion and diffusion into alumina, and chemical reactions at the interface. © 1998 Chapman & Hall 相似文献
8.
Markov Logic (ML) combines Markov networks (MNs) and first-order logic by attaching weights to first-order formulas and using
these as templates for features of MNs. State-of-the-art structure learning algorithms in ML maximize the likelihood of a
database by performing a greedy search in the space of structures. This can lead to suboptimal results because of the incapability
of these approaches to escape local optima. Moreover, due to the combinatorially explosive space of potential candidates these
methods are computationally prohibitive. We propose a novel algorithm for structure learning in ML, based on the Iterated
Local Search (ILS) metaheuristic that explores the space of structures through a biased sampling of the set of local optima.
We show through real-world experiments that the algorithm improves accuracy and learning time over the state-of-the-art algorithms.
On the other side MAP and conditional inference for ML are hard computational tasks. This paper presents two algorithms for
these tasks based on the Iterated Robust Tabu Search (IRoTS) metaheuristic. The first algorithm performs MAP inference and
we show through extensive experiments that it improves over the state-of-the-art algorithm in terms of solution quality and
inference time. The second algorithm combines IRoTS steps with simulated annealing steps for conditional inference and we
show through experiments that it is faster than the current state-of-the-art algorithm maintaining the same inference quality. 相似文献
9.
小议JavaScript库——Dojo、jQuery和PrototypeJS的比较 总被引:1,自引:0,他引:1
这是一篇小文章,讨论了JavaScript的应用库,JavaScript是最近两年飞速发展的技术领域,希望这篇文章能引发你的兴趣,帮助你进入这个领域。 相似文献
10.
理解LINQ-to-SQL 总被引:1,自引:0,他引:1
Dino Esposito 《程序员》2008,(9):104-104
大多数Web应用程序都是以数据驱动的,并且以关系数据库为中心。然而,多年来架构师已经设计了通过对象来建模问题域的应用程序。对象和关系数据库之间的通信一直都不流畅和简单。建立这类通信时遇到的困难通常称为“对象/关系阻抗失配”(O/ RM)。需要一个持久层来保存对象和从关系表载入对象。这些年来,产生了许多设计样式,为从事这项任务的架构师提供指南。现在,开发人员可以自己编写整个持久层,或者借助像NHibernate或Genome等O/RM工具的帮助,进行设计。 相似文献