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   113篇
  免费   2篇
教育   84篇
科学研究   15篇
各国文化   1篇
体育   4篇
文化理论   2篇
信息传播   9篇
  2019年   2篇
  2018年   5篇
  2017年   2篇
  2016年   2篇
  2015年   1篇
  2014年   4篇
  2013年   27篇
  2012年   5篇
  2011年   6篇
  2010年   1篇
  2009年   6篇
  2008年   6篇
  2007年   6篇
  2006年   3篇
  2005年   1篇
  2004年   1篇
  2003年   2篇
  2002年   2篇
  2001年   3篇
  1999年   2篇
  1998年   1篇
  1996年   1篇
  1995年   1篇
  1991年   2篇
  1990年   1篇
  1989年   2篇
  1985年   2篇
  1984年   1篇
  1981年   1篇
  1980年   2篇
  1978年   1篇
  1977年   1篇
  1969年   1篇
  1968年   1篇
  1966年   1篇
  1960年   1篇
  1941年   1篇
  1935年   1篇
  1934年   1篇
  1928年   1篇
  1924年   1篇
  1917年   1篇
  1915年   1篇
  1902年   1篇
排序方式: 共有115条查询结果,搜索用时 15 毫秒
1.
2.
3.
In Pavlovian fear conditioning, context-mediated decrements in conditioned responding (e.g., the US preexposure effect) can counteract competition between cues trained together (e.g., overshadowing). Two experiments were conducted using rats in a conditioned lick suppression preparation to determine whether context-mediated competition also counteracts competition between cues trained separately (retroactive interference, or RI). In Experiment 1, a combination of degraded contingency and RI treatments produced less of a decrement in conditioned responding than did either of those treatments alone. Experiment 2 showed that RI treatment attenuates the normally deleterious effect of trial massing. The results suggest that empirical similarities are shared by interference between cues trained apart and competition between cues trained together.  相似文献   
4.
5.
6.
7.
8.
9.
Herein is described the fabrication and use of a plastic multilayer 3-channel microfluidic fixture. Multilayer devices were produced by laser machining of plastic polymethylmethacrylate and polyethyleneterapthalate laminates by ablation. The fixture consisted of an array of nine individually addressable gold or gold/ITO working electrodes, and a resistive platinum heating element. Laser machining of both the fluidic pathways in the plastic laminates, and the stencil masks used for thermal evaporation to form electrode regions on the plastic laminates, enabled rapid and inexpensive implementation of design changes. Electrochemiluminescence reactions in the fixture were achieved and monitored through ITO electrodes. Electroaddressable aryl diazonium chemistry was employed to selectively pattern gold electrodes for electrochemical multianalyte DNA detection from double stranded DNA (dsDNA) samples. Electrochemical detection of dsDNA was achieved by melting of dsDNA molecules in solution with the integrated heater, allowing detection of DNA sequences specific to breast and colorectal cancers with a non-specific binding control. Following detection, the array surface could be renewed via high temperature (95 °C) stripping using the integrated heating element. This versatile and simple method for prototyping devices shows potential for further development of highly integrated, multi-functional bioanalytical devices.  相似文献   
10.
In this study, carbon fiber electrodes were incorporated within a hollow microneedle array, which was fabricated using a digital micromirror device-based stereolithography instrument. Cell proliferation on the acrylate-based polymer used in microneedle fabrication was examined with human dermal fibroblasts and neonatal human epidermal keratinocytes. Studies involving full-thickness cadaveric porcine skin and trypan blue dye demonstrated that the hollow microneedles remained intact after puncturing the outermost layer of cadaveric porcine skin. The carbon fibers underwent chemical modification in order to enable detection of hydrogen peroxide and ascorbic acid; electrochemical measurements were demonstrated using integrated electrode-hollow microneedle devices.  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