全文获取类型
收费全文 | 15094篇 |
免费 | 2417篇 |
国内免费 | 501篇 |
专业分类
电工技术 | 401篇 |
技术理论 | 2篇 |
综合类 | 1278篇 |
化学工业 | 283篇 |
金属工艺 | 144篇 |
机械仪表 | 469篇 |
建筑科学 | 7681篇 |
矿业工程 | 204篇 |
能源动力 | 59篇 |
轻工业 | 231篇 |
水利工程 | 284篇 |
石油天然气 | 70篇 |
武器工业 | 71篇 |
无线电 | 974篇 |
一般工业技术 | 1055篇 |
冶金工业 | 1152篇 |
原子能技术 | 18篇 |
自动化技术 | 3636篇 |
出版年
2025年 | 256篇 |
2024年 | 691篇 |
2023年 | 704篇 |
2022年 | 779篇 |
2021年 | 900篇 |
2020年 | 939篇 |
2019年 | 771篇 |
2018年 | 514篇 |
2017年 | 397篇 |
2016年 | 454篇 |
2015年 | 472篇 |
2014年 | 1087篇 |
2013年 | 829篇 |
2012年 | 1002篇 |
2011年 | 1099篇 |
2010年 | 959篇 |
2009年 | 862篇 |
2008年 | 855篇 |
2007年 | 843篇 |
2006年 | 713篇 |
2005年 | 565篇 |
2004年 | 454篇 |
2003年 | 371篇 |
2002年 | 334篇 |
2001年 | 298篇 |
2000年 | 171篇 |
1999年 | 123篇 |
1998年 | 84篇 |
1997年 | 69篇 |
1996年 | 63篇 |
1995年 | 41篇 |
1994年 | 33篇 |
1993年 | 23篇 |
1992年 | 21篇 |
1991年 | 21篇 |
1990年 | 19篇 |
1989年 | 13篇 |
1988年 | 13篇 |
1985年 | 15篇 |
1984年 | 16篇 |
1966年 | 8篇 |
1965年 | 8篇 |
1964年 | 15篇 |
1963年 | 7篇 |
1962年 | 6篇 |
1961年 | 6篇 |
1958年 | 10篇 |
1956年 | 9篇 |
1955年 | 15篇 |
1954年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
严诗琴 《数码设计:surface》2014,(11):120-122
"火桶"是南方传统的御寒器物,它具有造型简单,取材方便,功能实用多样的特点,凝聚了民间朴素造物的思想。同时,火桶所具有着深厚的人文特点和文化内涵。文章以黔东南镇远地区民间火桶为例,分析其形态、结构、功能及人机关系等内容,探究民间造物的设计巧思。 相似文献
2.
吴东 《数码设计:surface》2009,(11):90-92
品牌设计师通过知觉联想可以将文字语言转化为直接、可见的视觉图形传达给社会大众,这种语言上的转换是设计师发掘人们想象不到或想象不全面的一种表现方式,是艺术创造。同时,在没有限制,具有广泛可能性的创意、设计中,要把企业理念和目标等文字语言浓缩、整合出适合创意、设计的关键语,这一个个关键语就是品牌标志设计的依据和标准。有了这样的设计标准就会提高设计效率和准确性,减少在标志设计过程中的矛盾与摩擦,起到指引方向和检验最终方案的作用。 相似文献
3.
郑欲晓 《数码设计:surface》2009,(12):44-46
空白,也称为"虚空间",指被其他要素包围的空间。空白部分运用的好,有时则会成为设计中最突出、最令人瞩目的部分。本文就针对空白在视觉设计中的一些作用做相关的探讨。 相似文献
4.
城市街区空间引导系统与人们的日常生活息息相关,为人们的出行提供了便捷的标识引导,同时它也是城市形象的重要组成部分之一。本文分析总结了该系统的设计原则,并从视觉传达学科入手分析其视觉元素的设计。为了设计无语言障碍和有个性、地域化的城市街区空间引导系统,从符号、文字、色彩三方面对其进行设计思考。 相似文献
5.
本文从景观设计的角度,阐述了蒙山风景名胜区生态旅游的发展,分析了蒙山风景名胜区发展生态旅游的有利条件和存在的问题,并在此基础上提出生态旅游可持续发展的对策与建议。 相似文献
6.
《International journal of systems science》2012,43(7):1248-1267
This article proposes a compact algorithm for optimisation in noisy environments. This algorithm has a compact structure and employs differential evolution search logic. Since it is a compact algorithm, it does not store a population of solutions but a probabilistic representation of the population. This kind of algorithmic structure can be implemented in those real-world problems characterized by memory limitations. The degree of randomization contained in the compact structure allows a robust behaviour in the presence of noise. In addition the proposed algorithm employs the noise analysis survivor selection scheme. This scheme performs an analysis of the noise and automatically performs a re-sampling of the solutions in order to ensure both reliable pairwise comparisons and a minimal cost in terms of fitness evaluations. The noise analysis component can be reliably used in noise environments affected by Gaussian noise which allow an a priori analysis of the noise features. This situation is typical of problems where the fitness is computed by means of measurement devices. An extensive comparative analysis including four different noise levels has been included. Numerical results show that the proposed algorithm displays a very good performance since it regularly succeeds at handling diverse fitness landscapes characterized by diverse noise amplitudes. 相似文献
7.
Kane Michael J.; Poole Bradley J.; Tuholski Stephen W.; Engle Randall W. 《Canadian Metallurgical Quarterly》2006,32(4):749
The executive attention theory of working memory capacity (WMC) proposes that measures of WMC broadly predict higher order cognitive abilities because they tap important and general attention capabilities (R. W. Engle & M. J. Kane, 2004). Previous research demonstrated WMC-related differences in attention tasks that required restraint of habitual responses or constraint of conscious focus. To further specify the executive attention construct, the present experiments sought boundary conditions of the WMC-attention relation. Three experiments correlated individual differences in WMC, as measured by complex span tasks, and executive control of visual search. In feature-absence search, conjunction search, and spatial configuration search, WMC was unrelated to search slopes, although they were large and reliably measured. Even in a search task designed to require the volitional movement of attention (J. M. Wolfe, G. A. Alvarez, & T. S. Horowitz, 2000), WMC was irrelevant to performance. Thus, WMC is not associated with all demanding or controlled attention processes, which poses problems for some general theories of WMC. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
8.
9.
Evans Theodore Avery; Howell Sue; Westergaard Gregory Charles 《Canadian Metallurgical Quarterly》2005,31(4):399
Research on cross-modal performance in nonhuman primates is limited to a small number of sensory modalities and testing methods. To broaden the scope of this research, the authors tested capuchin monkeys (Cebus apella) for a seldom-studied cross-modal capacity in nonhuman primates, auditory-visual recognition. Monkeys were simultaneously played 2 video recordings of a face producing different vocalizations and a sound recording of 1 of the vocalizations. Stimulus sets varied from naturally occurring conspecific vocalizations to experimentally controlled human speech stimuli. The authors found that monkeys preferred to view face recordings that matched presented vocal stimuli. Their preference did not differ significantly across stimulus species or other stimulus features. However, the reliability of the latter set of results may have been limited by sample size. From these results, the authors concluded that capuchin monkeys exhibit auditory-visual cross-modal perception of conspecific vocalizations. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
10.
Olson Ingrid R.; Jiang Yuhong; Moore Katherine Sledge 《Canadian Metallurgical Quarterly》2005,31(5):889
The ability to remember visual stimuli over a short delay period is limited by the small capacity of visual working memory (VWM). Here the authors investigate the role of learning in enhancing VWM. Participants saw 2 spatial arrays separated by a 1-s interval. The 2 arrays were identical except for 1 location. Participants had to detect the difference. Unknown to the participants, some spatial arrays would repeat once every dozen trials or so for up to 32 repetitions. Spatial VWM performance increased significantly when the same location changed across display repetitions, but not at all when different locations changed from one display repetition to another. The authors suggest that a major role of learning in VWM is to mediate which information gets retained, rather than to directly increase VWM capacity. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献