全文获取类型
收费全文 | 1197篇 |
免费 | 55篇 |
国内免费 | 9篇 |
专业分类
电工技术 | 15篇 |
综合类 | 9篇 |
化学工业 | 246篇 |
金属工艺 | 17篇 |
机械仪表 | 31篇 |
建筑科学 | 43篇 |
能源动力 | 87篇 |
轻工业 | 155篇 |
水利工程 | 14篇 |
石油天然气 | 16篇 |
无线电 | 126篇 |
一般工业技术 | 209篇 |
冶金工业 | 94篇 |
原子能技术 | 4篇 |
自动化技术 | 195篇 |
出版年
2024年 | 5篇 |
2023年 | 23篇 |
2022年 | 55篇 |
2021年 | 70篇 |
2020年 | 62篇 |
2019年 | 56篇 |
2018年 | 49篇 |
2017年 | 61篇 |
2016年 | 50篇 |
2015年 | 35篇 |
2014年 | 48篇 |
2013年 | 88篇 |
2012年 | 59篇 |
2011年 | 82篇 |
2010年 | 55篇 |
2009年 | 52篇 |
2008年 | 50篇 |
2007年 | 34篇 |
2006年 | 32篇 |
2005年 | 39篇 |
2004年 | 36篇 |
2003年 | 18篇 |
2002年 | 7篇 |
2001年 | 14篇 |
2000年 | 11篇 |
1999年 | 13篇 |
1998年 | 26篇 |
1997年 | 18篇 |
1996年 | 7篇 |
1995年 | 16篇 |
1994年 | 8篇 |
1993年 | 7篇 |
1992年 | 7篇 |
1991年 | 9篇 |
1990年 | 7篇 |
1989年 | 5篇 |
1988年 | 9篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1977年 | 1篇 |
1976年 | 4篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1970年 | 3篇 |
1967年 | 4篇 |
1966年 | 1篇 |
排序方式: 共有1261条查询结果,搜索用时 15 毫秒
1.
Group Decision Making by Using Incomplete Fuzzy Preference Relations Based on T‐Consistency and the Order Consistency
下载免费PDF全文
![点击此处可从《国际智能系统杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Samina Ashraf 《国际智能系统杂志》2015,30(2):120-143
The existing group decision making techniques may not satisfy the order consistency for aggregation in some cases. The algorithm proposed in this paper overcomes the weaknesses of the existing techniques. The method determines the unknown preferences for group decision making in such a manner that the resulting matrix is T‐consistent and order consistent simultaneously. 相似文献
2.
3.
Our goal is to develop a robust out-of-core sorting program for a
distributed-memory cluster. The literature contains two dominant
paradigms for out-of-core sorting algorithms: merging-based and
partitioning-based. We explore a third paradigm, that of oblivious
algorithms. Unlike the two dominant paradigms, oblivious algorithms
do not depend on the input keys and therefore lead to predetermined
I/O and communication patterns in an out-of-core setting.
Predetermined I/O and communication patterns facilitate overlapping
I/O, communication, and computation for efficient implementation. We
have developed several out-of-core sorting programs using the paradigm
of oblivious algorithms. Our baseline implementation, 3-pass
columnsort, was based on Leighton's columnsort algorithm. Though
efficient in terms of I/O and communication, 3-pass columnsort has a
restriction on the maximum problem size. As our first effort toward
relaxing this restriction, we developed two implementations: subblock
columnsort and M-columnsort. Both of these implementations
incur substantial performance costs: subblock columnsort performs
additional disk I/O, and M-columnsort needs substantial
amounts of extra communication and computation. In this paper we
present slabpose columnsort, a new oblivious algorithm that we have
designed explicitly for the out-of-core setting. Slabpose columnsort
relaxes the problem-size restriction at no extra I/O or communication
cost. Experimental evidence on a Beowulf cluster shows that unlike
subblock columnsort and M-columnsort, slabpose columnsort runs
almost as fast as 3-pass columnsort. To the best of our knowledge,
our implementations are the first out-of-core multiprocessor sorting
algorithms that make no assumptions about the keys and produce output
that is perfectly load balanced and in the striped order assumed by
the Parallel Disk Model. 相似文献
4.
Ashraf Ayoub 《Computers & Structures》2003,81(7):411-421
This paper presents an inelastic element for the analysis of beams on foundations. The element is derived from a two-field mixed formulation with independent approximation of forces and displacements. The state determination algorithm for the implementation of the element in a general purpose nonlinear finite element analysis program is presented and its stability characteristics are discussed. Numerical studies are performed to compare the model with the classical displacement formulation. The studies confirm the superiority of the proposed model in describing the inelastic behavior of beams on foundations. 相似文献
5.
We introduce an effective computer aided learning visual tool (CALVT) to teach graph-based applications. We present the robot motion planning problem as an example of such applications. The proposed tool can be used to simulate and/or further to implement practical systems in different areas of computer science such as graphics, computational geometry, robotics and networking. In the robot motion planning example, CALVT enables users to setup the working environment by creating obstacles and a robot of different shapes, specifying starting and goal positions, and setting other path or environment parameters from a user-friendly interface. The path planning system involves several phases. Each of these modules is complex and therefore we provide the possibility of visualizing graphically the output of each phase. Based on our experience, this tool has been an effective one in classroom teaching. It not only cuts down, significantly, on the instructor’s time and effort but also motivates senior/graduate students to pursue work in this specific area of research. 相似文献
6.
Ashraf Bastawros Abhijit Chandra Yongjin Guo Bo Yan 《Journal of Electronic Materials》2002,31(10):1022-1031
The role of a porous pad in controlling material-removal rate (MRR) during the chemical-mechanical planarization (CMP) process
has been studied numerically. The numerical results are used to develop a phenomenological model that correlates the forces
on each individual abrasive particle to the applied nominal pressure. The model provides a physical explanation for the experimentally
observed domains of pressure-dependent MRR, where the pad deformation controls the load sharing between active-abrasive particles
and direct pad-wafer contact. The predicted correlations between MRR and slurry characteristics, i.e., particle size and concentration,
are in agreement with experimentally measured trends reported by Ouma1 and Izumitani.2 相似文献
7.
M. A. Chaudhry 《Journal of Materials Science》1991,26(4):1106-1108
The dielectric response of hexagonal boron nitride has been measured perpendicular to the cleavage planes at fixed temperatures in the range up to 914 K. The frequency span lies between 10 mHz and 10 kHz range. The dielectric response consists of two loss peaks and a strong low frequency dispersion (LFD). The results are related to the movement of impurity ions. 相似文献
8.
Abdul S Chaudhry 《Journal of the science of food and agriculture》2007,87(14):2617-2624
BACKGROUND: Two factorial studies compared enzymic and in sacco methods to estimate degradation of ruminant foods. Enzyme degradation (in vitro = enzyme) was determined from the release of leucine‐equivalent amino acid (LA) crude protein (CP) from sunflower meal (SF), maize gluten meal (MG), distillers' dark grain (DG) and field beans (FB) after their separate incubations with Streptomyces griseus enzyme for 0–24 h. In sacco crude protein (CP) degradation of these foods was estimated during washing (0 h) and rumen incubations in fistulated cows for 2–24 h. The LA data were expressed as g LA per either kg of CP (LACP) or acid‐hydrolysable LA (HLA) of each food and compared with in sacco data. RESULTS: These methods showed comparable degradation with time (P < 0.01). The in sacco and HLA were greater than LACP for all foods except MG where in sacco value was either lower or equal to LACP depending upon the incubation time (P > 0.05 or P < 0.05). Conversely, HLA was significantly (P < 0.01) greater than LACP from 2 h onwards. At 0 h, in sacco values were significantly greater than those of enzyme for SF, DG and FB (P < 0.05) but not for MG. The foods differed significantly for degradation constants (a, b, c) in each method (P < 0.05). CONCLUSIONS: Despite variations between in sacco and enzyme estimates for different foods, the relationships between these estimates suggest that the HLA enzyme method has the potential to estimate food degradation. Copyright © 2007 Society of Chemical Industry 相似文献
9.
A study of radiation effects on various types of glasses, dielectric optical coatings, cemented optics and fiber was undertaken with a view to select them for extreme radiation environments. Samples were exposed to different radiation doses in the Pakistan Research Reactor-I (PARR-I) for neutron and Cobalt 60 source for gamma irradiation. Transmissions were measured before and after irradiation. The dielectric coatings were subjected to additional tests (adhesion, abrasion and humidity, etc.) as per MIL-M-13508C and MIL-C-675C. All 15 glasses studied showed varying amounts of transmission loss as expected, with negligible degradation for three types. Recovery of transmissions with time/ageing was also studied, with more or less complete recovery with temperature annealing. A faster bleaching of darkened/brown glasses was achieved by using UV lamps or UV laser. The dielectric coatings (HR, AR) and one of the two commercial optical cements showed excellent resistance to neutrons and gamma radiations, and could be good candidates for the fabrication and utilization of optical components in extreme radiation environments. The data allowed several Chinese glasses to be studied for the first time. 相似文献
10.