全文获取类型
收费全文 | 2228篇 |
免费 | 84篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 26篇 |
综合类 | 5篇 |
化学工业 | 545篇 |
金属工艺 | 32篇 |
机械仪表 | 46篇 |
建筑科学 | 128篇 |
矿业工程 | 33篇 |
能源动力 | 39篇 |
轻工业 | 162篇 |
水利工程 | 40篇 |
石油天然气 | 4篇 |
无线电 | 176篇 |
一般工业技术 | 322篇 |
冶金工业 | 229篇 |
原子能技术 | 5篇 |
自动化技术 | 526篇 |
出版年
2023年 | 25篇 |
2022年 | 44篇 |
2021年 | 60篇 |
2020年 | 30篇 |
2019年 | 27篇 |
2018年 | 61篇 |
2017年 | 51篇 |
2016年 | 79篇 |
2015年 | 72篇 |
2014年 | 84篇 |
2013年 | 98篇 |
2012年 | 113篇 |
2011年 | 143篇 |
2010年 | 81篇 |
2009年 | 125篇 |
2008年 | 110篇 |
2007年 | 95篇 |
2006年 | 107篇 |
2005年 | 76篇 |
2004年 | 76篇 |
2003年 | 50篇 |
2002年 | 56篇 |
2001年 | 33篇 |
2000年 | 28篇 |
1999年 | 47篇 |
1998年 | 51篇 |
1997年 | 54篇 |
1996年 | 53篇 |
1995年 | 47篇 |
1994年 | 39篇 |
1993年 | 29篇 |
1992年 | 17篇 |
1991年 | 18篇 |
1990年 | 13篇 |
1989年 | 9篇 |
1988年 | 14篇 |
1987年 | 16篇 |
1985年 | 16篇 |
1984年 | 13篇 |
1983年 | 14篇 |
1982年 | 8篇 |
1981年 | 9篇 |
1980年 | 10篇 |
1979年 | 10篇 |
1978年 | 12篇 |
1977年 | 11篇 |
1976年 | 18篇 |
1975年 | 9篇 |
1974年 | 7篇 |
1971年 | 7篇 |
排序方式: 共有2318条查询结果,搜索用时 15 毫秒
31.
Marco Bakera Tiziana Margaria Clemens D. Renner Bernhard Steffen 《Innovations in Systems and Software Engineering》2009,5(3):211-228
We show on a case study from an autonomous aerospace context how to apply a game-based model-checking approach as a powerful
technique for the verification, diagnosis, and adaptation of system behaviors based on temporal properties. This work is part
of our contribution within the SHADOWS project, where we provide a number of enabling technologies for model-driven self-healing.
We propose here to use GEAR, a game-based model checker, as a user-friendly tool that can offer automatic proofs of critical
properties of such systems. Although it is a model checker for the full modal μ-calculus, it also supports derived, more user-oriented logics. With GEAR, designers and engineers can interactively investigate
automatically generated winning strategies for the games, by this way exploring the connection between the property, the system,
and the proof.
This work has been partially supported by the European Union Specific Targeted Research Project SHADOWS (IST-2006-35157), exploring a Self-Healing Approach to Designing cOmplex softWare Systems. The project’s web page is at .
This article is an extended version of Renner et al. [18] presented at ISoLA 2007, Poitiers, December 2007. 相似文献
32.
33.
J. L. Tallon C. Bernhard Ch. Niedermayer J. Shimoyama S. Hahakura K. Yamaura Z. Hiroi M. Takano K. Kishio 《Journal of Low Temperature Physics》1996,105(5-6):1379-1384
We show from muon spin relaxation (SR) studies on mercury HTS superconductors that a 50-fold increase in irreversibility field obtained by partial substitution of Re for Hg is due to metallisation of the Hg/Re layer. Induced superconductivity on this metallic layer doubles the overall superfluid density. This suggests a new approach to the design of high performance HTS materials: metallising one of the non-CuO2 interlayers and thereby greatly enhancing the superconducting properties. 相似文献
34.
Georg Birkenheuer Andr�� Brinkmann Mikael H?gqvist Alexander Papaspyrou Bernhard Schott Dietmar Sommerfeld Wolfgang Ziegler 《Journal of Grid Computing》2011,9(3):355-377
Infrastructure federation is becoming an increasingly important issue for modern Distributed Computing Infrastructures (DCIs):
Dynamic elasticity of quasi-static Grid environments, incorporation of special-purpose resources into commoditized Cloud infrastructures,
cross-community collaboration for increasingly diverging areas of modern e-Science, and Cloud Bursting pose major challenges
on the technical level for many resource and middleware providers. Especially with respect to increasing costs of operating
data centers, the intelligent yet automated and secure sharing of resources is a key factor for success. With the D-Grid Scheduler
Interoperability (DGSI) project within the German D-Grid Initiative, we provide a strategic technology for the automatically
negotiated, SLA-secured, dynamically provisioned federation of resources and services for Grid-and Cloud-type infrastructures.
This goal is achieved by complementing current DCI schedulers with the ability to federate infrastructure for the temporary
leasing of resources and rechanneling of workloads. In this work, we describe the overall architecture and SLA-secured negotiation
protocols within DGSI and depict an advanced mechanism for resource delegation through means of dynamically provisioned, virtualized
middleware. Through this methodology, we provide the technological foundation for intelligent capacity planning and workload
management in a cross-infrastructure fashion. 相似文献
35.
Bernhard Burgermeister Martin Arnold Alexander Eichberger 《Multibody System Dynamics》2011,26(1):1-14
The rapidly increasing complexity of multi-body system models in applications like vehicle dynamics, robotics and bio-mechanics
requires qualitative new solution methods to slash computing times for the dynamical simulation. 相似文献
36.
Fuchs E Gruber T Nitschke J Sick B 《IEEE transactions on pattern analysis and machine intelligence》2010,32(12):2232-2245
The paper presents SwiftSeg, a novel technique for online time series segmentation and piecewise polynomial representation. The segmentation approach is based on a least-squares approximation of time series in sliding and/or growing time windows utilizing a basis of orthogonal polynomials. This allows the definition of fast update steps for the approximating polynomial, where the computational effort depends only on the degree of the approximating polynomial and not on the length of the time window. The coefficients of the orthogonal expansion of the approximating polynomial-obtained by means of the update steps-can be interpreted as optimal (in the least-squares sense) estimators for average, slope, curvature, change of curvature, etc., of the signal in the time window considered. These coefficients, as well as the approximation error, may be used in a very intuitive way to define segmentation criteria. The properties of SwiftSeg are evaluated by means of some artificial and real benchmark time series. It is compared to three different offline and online techniques to assess its accuracy and runtime. It is shown that SwiftSeg-which is suitable for many data streaming applications-offers high accuracy at very low computational costs. 相似文献
37.
This special issue collects current advances in the ongoing attempt to obtain synergies from the combination of Tests and
Proofs. 相似文献
38.
This paper introduces a system for real-time physiological measurement, analysis, and metaphorical visualization within a virtual environment (VE). Our goal is to develop a method that allows humans to unconsciously relate to parts of an environment more strongly than to others, purely induced by their own physiological responses to the virtual reality (VR) displays. In particular, we exploit heart rate, respiration, and galvanic skin response in order to control the behavior of virtual characters in the VE. Such unconscious processes may become a useful tool for storytelling or assist guiding participants through a sequence of tasks in order to make the application more interesting, e.g., in rehabilitation. We claim that anchoring of subjective bodily states to a virtual reality (VR) can enhance a person’s sense of realism of the VR and ultimately create a stronger relationship between humans and the VR. 相似文献
39.
With the continually increasing complexity of e-learning environments, there is a need for integrating concepts of cognitive load theory (CLT) with concepts of human–computer interaction (HCI). Basic concepts of both fields were reviewed and contrasted. A literature review was conducted within the literature database “The Guide to Computing Literature,” searching for “cognitive load theory” and “Sweller.” Sixty-five publications contained “cognitive load” in their titles or abstracts. Each publication was checked to see whether it contained the concepts of intrinsic, extraneous, or germane cognitive load. The review showed that CLT concepts have been adopted in HCI. However, the concept of germane cognitive load has attracted less attention up to the present time. Two conceptual models are proposed. The first model divides extraneous cognitive load into load induced by the instructional design and load caused by software usage. The model clarifies the focus of traditional usability principles and of existing instructional design principles derived from CLT. The second model fits CLT concepts into the basic components of user-centered design. The concept of germane cognitive load illustrates that an increase of cognitive load can be desirable when designing e-learning environments. Areas for future interdisciplinary research are sketched. 相似文献
40.