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   47500篇
  免费   1803篇
  国内免费   13篇
  49316篇
  2019年   524篇
  2018年   761篇
  2017年   738篇
  2016年   816篇
  2015年   602篇
  2014年   734篇
  2013年   4721篇
  2012年   1276篇
  2011年   1340篇
  2010年   861篇
  2009年   851篇
  2008年   1290篇
  2007年   1161篇
  2006年   1106篇
  2005年   989篇
  2004年   978篇
  2003年   982篇
  2002年   988篇
  2001年   1369篇
  2000年   1288篇
  1999年   1040篇
  1998年   564篇
  1997年   529篇
  1996年   631篇
  1995年   622篇
  1994年   587篇
  1993年   577篇
  1992年   1039篇
  1991年   913篇
  1990年   930篇
  1989年   813篇
  1988年   810篇
  1987年   805篇
  1986年   793篇
  1985年   804篇
  1984年   761篇
  1983年   666篇
  1982年   547篇
  1981年   556篇
  1980年   512篇
  1979年   686篇
  1978年   583篇
  1976年   527篇
  1975年   648篇
  1974年   662篇
  1973年   674篇
  1972年   624篇
  1971年   556篇
  1970年   497篇
  1968年   596篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
941.
942.
943.
A Systems Dilemma   总被引:1,自引:0,他引:1  
The current shift of interest, reflected in public policy, from the production of goods to the provision of services, has caused a major re-examination of the nature of the services the individual can expect from his society. This re-examination is producing a number of insights, some of them shocking. In particular, we are learning that many of the systems we have created to deliver services are, in the name of “progress” and “civilization,” contributing to the conditions of human distress they were designed to alleviate. Much has been written lately about how service systems of one kind or another subvert their announced goals—how a welfare system perpetuates poverty, or how the medical profession creates iatrogenic illness. There has not been very much written, however, about how several systems inadvertently combine in their day to day operations in such a way as to frustrate each others' activities, and how, in so doing, they destroy in varying degrees the lives of people, or render it difficult for them to improve their lives. We have all been much too tightly locked in our own niches by training, experience, and various types of private interest to see this kind of interlock. It comes into sharp perspective only when one studies the problems of a single person in terms of his total life space, his “ecology.” This paper represents an effort to describe one such situation in a family as viewed from a community health services program designed to approach human crises as ecological phenomena, and to explore and respond to them within this framework. We have found that the best way to organize our view of the environmental field people move in is according to the diverse systems which make it up, so we have labeled our theoretical base “ecological systems theory.” ( 1 ) What is of particular interest to the behavioral scientist in the situation described is that neither individual nor family diagnosis, nor the contributions of the larger systems (in this case a housing system and a system of medical care) will, if viewed separately, explain the state of the man in question. Only when the contributions of all of these systems are made clear, and their interrelationships explored, do the origins of the phenomena described begin to emerge.  相似文献   
944.
945.
946.
947.
948.
Effect of stereoscopic cues on perceived whiteness   总被引:1,自引:0,他引:1  
  相似文献   
949.
950.
A semiautomatic version of the Wisconsin General Test Apparatus is described along with circuitry. Comparison data are provided for the semiautomatic and manual WGTA obtained under comparable procedures and conditions. Response latencies are given for go/no-go object discrimination problems and subsequent retention tests.  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