首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   779篇
  免费   33篇
电工技术   6篇
综合类   1篇
化学工业   140篇
金属工艺   10篇
机械仪表   18篇
建筑科学   42篇
能源动力   20篇
轻工业   56篇
水利工程   6篇
石油天然气   3篇
无线电   36篇
一般工业技术   126篇
冶金工业   227篇
原子能技术   3篇
自动化技术   118篇
  2023年   5篇
  2022年   4篇
  2021年   19篇
  2020年   21篇
  2019年   15篇
  2018年   14篇
  2017年   14篇
  2016年   23篇
  2015年   10篇
  2014年   28篇
  2013年   35篇
  2012年   56篇
  2011年   64篇
  2010年   52篇
  2009年   37篇
  2008年   48篇
  2007年   43篇
  2006年   32篇
  2005年   42篇
  2004年   21篇
  2003年   10篇
  2002年   20篇
  2001年   12篇
  2000年   9篇
  1999年   10篇
  1998年   21篇
  1997年   17篇
  1996年   8篇
  1995年   8篇
  1994年   10篇
  1993年   8篇
  1992年   5篇
  1991年   5篇
  1990年   8篇
  1989年   8篇
  1988年   10篇
  1987年   3篇
  1986年   4篇
  1985年   5篇
  1984年   3篇
  1983年   6篇
  1982年   7篇
  1981年   5篇
  1980年   3篇
  1978年   5篇
  1976年   4篇
  1975年   4篇
  1974年   2篇
  1967年   3篇
  1962年   1篇
排序方式: 共有812条查询结果,搜索用时 15 毫秒
1.
2.
3.
A Sketch-Based Interface for Clothing Virtual Characters   总被引:5,自引:0,他引:5  
This interactive system for garment creation determines a garment's shape and how the character wears it based on a user-drawn sketch. The system then uses distances between the 2D garment silhouette and the character model to infer remaining distance variations in 3D  相似文献   
4.
5.
A virtual roundtable (featuring panelists Steven Bellovin, Terry Benzel, Bob Blakely, Dorothy Denning, Whitfield Diffie, Jeremy Epstein, and Paulo Verissimo) discussing the next 15 years in computer security.  相似文献   
6.
7.
A feature of the empirical literature in colour psychology is that little attention has been given to how people in real settings engage in colour selection. Surprisingly, with rare exceptions, we know almost nothing about this. Besides its theoretical significance within psychology, this question has practical implications for industries where colour choice is important. A study is reported into that most ubiquitous of activities, selecting a paint colour for the home. This used a retrospective method supported by qualitative data analysis (NVivo) in which participants described their process of colour selection. The results indicate a process that is far from uniform, but one that consists of two essential stages. The first involves arriving at what we refer to as an affective specification of the qualities sought. Once constructed, this leads to the second stage of matching colour attributes to that specification. Selecting a wall colour emerges as a surprisingly complex process, and one that corresponds more closely to a search than to a simple affective choice. A parallel is drawn with decision research, particularly the field of naturalistic decision‐making. From participants' reports, colour selection also emerges as a process that women appear to understand better than men. © 2007 Wiley Periodicals, Inc. Col Res Appl, 33, 55–60, 2008  相似文献   
8.
This research examines the interdependence in time series wind speed data measured in the same location at four different heights. A multiple-equation system known as a vector autoregression is proposed for characterizing the time series dynamics of wind. Additionally, the recently developed method of generalized impulse response analysis provides insight into the cross-effects of the wind series and their responses to shocks. Findings are based on analysis of contemporaneous wind speed time histories taken at 13, 33, 70 and 160 ft above ground level with a sampling rate of 10 Hz. The results indicate that wind speeds measured at 70 ft was the most variable. Further, the turbulence persisted longer at the 70-ft measurement than at the other heights. The greatest interdependence is observed at 13 ft. Gusts at 160 ft led to the greatest persistence to an “own” shock and led to greatest persistence in the responses of the other wind series.  相似文献   
9.
10.
Confined foaming of poly(ethylene-co-vinyl acetate-co-carbon monoxide) using carbon dioxide as a physical blowing agent in a mold with either permeable or impermeable boundaries has been explored as a strategy to control final foam dimensions and morphology. The results are discussed in terms of comparisons to free-foaming experiments conducted at the same pressure and temperature conditions following the same pressurization and depressurization paths. Foaming experiments were carried out at 30 and 40°C and 100, 200, and 300 bar followed by rapid depressurization of the foaming cell. Confined foaming led to smaller pores with more uniform distributions across the polymer cross-section. However, bulk foam densities of the foams generated under confinement were higher than those generated under the free-foaming mode. Surface characteristics and skin layer formation were altered by expansion against both the permeable and impermeable boundaries. Confined foaming promotes uniform pore distribution and overall dimensional uniformity and may impart surface texture but the trade-off is in the degree to which the bulk foam density can be lowered.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号