全文获取类型
收费全文 | 3734篇 |
免费 | 219篇 |
国内免费 | 8篇 |
专业分类
电工技术 | 77篇 |
综合类 | 2篇 |
化学工业 | 830篇 |
金属工艺 | 99篇 |
机械仪表 | 66篇 |
建筑科学 | 74篇 |
矿业工程 | 3篇 |
能源动力 | 130篇 |
轻工业 | 537篇 |
水利工程 | 20篇 |
石油天然气 | 15篇 |
无线电 | 357篇 |
一般工业技术 | 612篇 |
冶金工业 | 567篇 |
原子能技术 | 35篇 |
自动化技术 | 537篇 |
出版年
2024年 | 4篇 |
2023年 | 33篇 |
2022年 | 72篇 |
2021年 | 101篇 |
2020年 | 72篇 |
2019年 | 81篇 |
2018年 | 115篇 |
2017年 | 111篇 |
2016年 | 109篇 |
2015年 | 88篇 |
2014年 | 148篇 |
2013年 | 269篇 |
2012年 | 165篇 |
2011年 | 242篇 |
2010年 | 159篇 |
2009年 | 223篇 |
2008年 | 203篇 |
2007年 | 133篇 |
2006年 | 146篇 |
2005年 | 121篇 |
2004年 | 119篇 |
2003年 | 87篇 |
2002年 | 86篇 |
2001年 | 71篇 |
2000年 | 65篇 |
1999年 | 76篇 |
1998年 | 171篇 |
1997年 | 131篇 |
1996年 | 92篇 |
1995年 | 62篇 |
1994年 | 52篇 |
1993年 | 47篇 |
1992年 | 29篇 |
1991年 | 22篇 |
1990年 | 26篇 |
1989年 | 24篇 |
1988年 | 19篇 |
1987年 | 16篇 |
1986年 | 21篇 |
1985年 | 19篇 |
1984年 | 14篇 |
1983年 | 12篇 |
1982年 | 17篇 |
1981年 | 21篇 |
1980年 | 12篇 |
1979年 | 6篇 |
1978年 | 4篇 |
1977年 | 11篇 |
1976年 | 21篇 |
1975年 | 5篇 |
排序方式: 共有3961条查询结果,搜索用时 0 毫秒
81.
82.
This paper presents three projects involving the design and fabrication of architectural structures through the use of different
parametric software and digital manufacturing methods. The first project is a flexible partition composed of interlocking
elements shaped using a laser-cutter. The second project is a university exhibition unit made with various wooden panels manufactured
through a computer numerical controlled (CNC) system. The third project is a system of metal sheets folded by digital machines
to create urban circulation spaces. The three works develop a parametric programming of geometry based on certain technical
factors, enabling the recognition of patterns of interaction between formal and constructive issues involved in the definition
of shapes through parametric controls. Differences in materials and processes are contrasted by similarities of function and
conditions involved, creating a system of local, global, productive and environmental parameters that produces a repertoire
of self-similar dimensions and variations as well as multiple possibilities of initial setups and final configurations. It
suggests a specific field of design exploration focusing on the development of differentiated components and variable architectural
configurations, in a kind of open parametric system. 相似文献
83.
Parallel programming for multimedia applications 总被引:2,自引:2,他引:0
Hari Kalva Aleksandar Colic Adriana Garcia Borko Furht 《Multimedia Tools and Applications》2011,51(2):801-818
Computing capabilities are continuing to increase with the availability of multi core and many core processors. The wide availability
of multi core processors has made parallel programming possible for end user applications running on desktops, workstations,
and mobile devices. While parallel hardware has become common, software that exploits parallel capabilities is just beginning
to take hold. Multimedia applications, with their data parallel nature and large computing requirements will benefit significantly
from parallel programming. In this paper an overview of parallel programming is presented and languages and tools for parallel
programming such as OpenMP and CUDA are introduced within the scope of multimedia applications. 相似文献
84.
Zhengxiong Yang Stefan Kollmannsberger Alexander Düster Martin Ruess Eduardo Grande Garcia Rainer Burgkart Ernst Rank 《Computing and Visualization in Science》2011,14(5):207-216
Numerous numerical methods have been developed in an effort to accurately predict stresses in bones. The largest group are variants of the h-version of the finite element method (h-FEM), where low order Ansatz functions are used. By contrast, we3 investigate a combination of high order FEM and a fictitious domain approach, the finite cell method (FCM). While the FCM has been verified and validated in previous publications, this article proposes methods on how the FCM can be made computationally efficient to the extent that it can be used for patient specific, interactive bone simulations. This approach is called computational steering and allows to change input parameters like the position of an implant, material or loads and leads to an almost instantaneous change in the output (stress lines, deformations). This direct feedback gives the user an immediate impression of the impact of his actions to an extent which, otherwise, is hard to obtain by the use of classical non interactive computations. Specifically, we investigate an application to pre-surgical planning of a total hip replacement where it is desirable to select an optimal implant for a specific patient. Herein, optimal is meant in the sense that the expected post-operative stress distribution in the bone closely resembles that before the operation. 相似文献
85.
Luis de-Marcos José Ramón Hilera Roberto Barchino Lourdes Jiménez José Javier Martínez José Antonio Gutiérrez José María Gutiérrez Salvador Otón 《Computers & Education》2010
Mobile learning is considered an evolution of e-learning that embraces the ubiquitous nature of current computational systems in order to improve teaching and learning. Within this context it is possible to develop mobile applications oriented to learning, but it is also important to assess to what extent such applications actually work. In this paper we present a new tool designed to reinforce students’ knowledge by means of self-assessment. Improvement in student achievement was evaluated and an attitudinal survey was also carried out to measure student attitudes towards this new tool. Three different experimental groups were selected for this research, with students aged from 14 to 21 years old, including high-school and university students. Results show that this kind of tool improves student achievement, especially amongst younger learners, with a relatively low impact on current teaching activities and methodology. 相似文献
86.
Termination is one of the most interesting problems when dealing with context-sensitive rewrite systems. Although a good number of techniques for proving termination of context-sensitive rewriting (CSR) have been proposed so far, the adaptation to CSR of the dependency pair approach, one of the most powerful techniques for proving termination of rewriting, took some time and was possible only after introducing some new notions like collapsing dependency pairs, which are specific for CSR. In this paper, we develop the notion of context-sensitive dependency pair (CSDP) and show how to use CSDPs in proofs of termination of CSR. The implementation and practical use of the developed techniques yield a novel and powerful framework which improves the current state-of-the-art of methods for automatically proving termination of CSR. 相似文献
87.
New techniques for simulating high performance MPI applications on large storage networks 总被引:1,自引:0,他引:1
Alberto Núñez Javier Fernández Jose D. Garcia Félix Garcia Jesús Carretero 《The Journal of supercomputing》2010,51(1):40-57
In this work, we propose new techniques to analyze the behavior, the performance, and specially the scalability of High Performance
Computing (in short, HPC) applications on different computing architectures. Our final objective is to test applications using
a wide range of architectures (real or merely designed) and scaling it to any number of nodes or components. This paper presents
a new simulation framework, called SIMCAN, for HPC architectures. The main characteristic of the proposed simulation framework
is the ability to be configured for simulating a wide range of possible architectures that involve any number of components.
SIMCAN is developed to simulate complete HPC architectures, but putting special emphasis on the storage and network subsystems.
The SIMCAN framework can handle complete components (nodes, racks, switches, routers, etc.), but also key elements of the
storage and network subsystems (disks, caches, sockets, file systems, schedulers, etc.). We also propose several methods to
implement the behavior of HPC applications. Each method has its own advantages and drawbacks. In order to evaluate the possibilities
and the accuracy of the SIMCAN framework, we have tested it by executing a HPC application called BIPS3D on a hardware-based
computing cluster and on a modeled environment that represent the real cluster. We also checked the scalability of the application
using this kind of architecture by simulating the same application with an increased number of computing nodes. 相似文献
88.
89.
Adriana S. Vivacqua Ana Cristina B. Garcia Angela Gomes 《Expert systems with applications》2011,38(2):1139-1147
Facilitating meetings is not an easy task. To assist the facilitator, we have been designing intelligent support systems, which can help contextual sensemaking, decision making and action. However, these systems are constructed based on behavioral models that provide guidelines to understand participant behaviors. This paper presents an ontology to describe participants’ behaviors in collaborative design meetings and rules that correlate them with the group’s acceptance of the final product. This ontology describes the group dynamics at collocated meetings, using verbal and non-verbal cues of attention shifts and attention maintenance as its basic constructs. The objective of creating this ontology was to better understand face-to-face meetings to eventually help meeting facilitators identify issues that may lead to dissatisfaction with the final product through behavioral cues. The ontology was derived through extensive analysis of a series of engineering design session videos. The design group was composed of experts with similar backgrounds, but working in different divisions of the same company. Different points of view were argued and decisions were made at the end of each meeting. After each meeting, participants were asked to asynchronously commit to the decisions made in the group. Our ontology can be used to identify the factors that lead to an undesired outcome, and now serves as a basis for a new project, which uses rules to support design meetings, improve final artifact acceptance and reduce rework. Our conclusions point out correlations between designers’ behaviors and future artifact acceptance and actions that interrupt or bring back group attention. The ontology was validated through application to other meeting situations. These findings may guide software developers in the creation of tools to support group design, and may be applied by an intelligent system. 相似文献
90.
Julián Luengo Salvador García Francisco Herrera 《Expert systems with applications》2009,36(4):7798-7808
In this paper, we focus on the experimental analysis on the performance in artificial neural networks with the use of statistical tests on the classification task. Particularly, we have studied whether the sample of results from multiple trials obtained by conventional artificial neural networks and support vector machines checks the necessary conditions for being analyzed through parametrical tests. The study is conducted by considering three possibilities on classification experiments: random variation in the selection of test data, the selection of training data and internal randomness in the learning algorithm.The results obtained state that the fulfillment of these conditions are problem-dependent and indefinite, which justifies the need of using non-parametric statistics in the experimental analysis. 相似文献