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   822篇
  免费   63篇
  885篇
  2024年   2篇
  2023年   17篇
  2022年   20篇
  2021年   24篇
  2020年   27篇
  2019年   25篇
  2018年   56篇
  2017年   54篇
  2016年   50篇
  2015年   38篇
  2014年   38篇
  2013年   111篇
  2012年   42篇
  2011年   37篇
  2010年   34篇
  2009年   15篇
  2008年   45篇
  2007年   36篇
  2006年   30篇
  2005年   26篇
  2004年   20篇
  2003年   19篇
  2002年   12篇
  2001年   5篇
  2000年   19篇
  1999年   6篇
  1998年   4篇
  1997年   5篇
  1996年   5篇
  1994年   6篇
  1993年   6篇
  1992年   3篇
  1989年   3篇
  1988年   7篇
  1987年   2篇
  1986年   5篇
  1984年   6篇
  1983年   2篇
  1981年   2篇
  1980年   1篇
  1979年   3篇
  1978年   1篇
  1977年   3篇
  1976年   1篇
  1974年   1篇
  1973年   2篇
  1972年   1篇
  1971年   1篇
  1963年   1篇
  1961年   1篇
排序方式: 共有885条查询结果,搜索用时 0 毫秒
161.
The purpose of this article is to compare the theory and reality of agricultural research networks in sub-Saharan Africa. Networking is a mode of organization that generally suits the new environmental conditions. The analysis of the agricultural research network environment in sub-Saharan Africa shows that when institutional networks started to proliferate, human and institutional conditions were not yet ripe. This explained some of the problems. Nowadays, conditions have improved. Despite all difficulties, networks have contributed to creating a scientific community, have participated in apportioning and even harmonizing research activities, and have made it possible to maintain research activities in countries going through a crisis. Marie de Lattre-Gasquet is a researcher from the Centre de coopération internationale en recherche agronomique pour le développement (CIRAD), in France. Within the external relations directorate of CIRAD, she has been responsible for the relationships between CIRAD and international organizations. She has also actively participated in the preparation of CIRAD’s long-term strategy. She worked for the International Service for National Agricultural Research (ISNAR) in The Netherlands from 1983 to 1985. She holds a Master in International Management (AGSIM, Thunderbird Campus) and a Doctorate in Economy (Université de Paris X). He is mostly working on the agricultural research networks in sub-Saharan Africa. He holds a diploma from the Institut National d’Agronomie—Paris Grignon.  相似文献   
162.
163.
Consistent application of dialectical materialism leads Marxism-Leninism to the assertion that matter is infinite in its properties. However, the history of physics shows that the various levels of matter possess geometric dimensions that originate at the lowest level and continue through the others. The search for absolute natural constants — which Planck called the most pleasant task of physics — shows the conviction of the physicists that there is a limit to the parameters, a limit beyond which matter is no longer divisible. Translated by T. J. BLAKELEY  相似文献   
164.
1373 psychology students from Barcelona (Spain), Liège (Belgium), Lille (France), Mexico city (Mexico) and Montréal (Canada) responded to a questionnaire dealing with their image of the discipline at various points in their university career. The students were asked to designate the authors they felt to be the most important as well as their preferences in regard to various areas and tendencies in psychology. The results show more agreement than could have been expected considering the cultural diversity and the great distance among the groups examined. Relevant differences from the other universities studied were found only with the Mexican students.  相似文献   
165.
166.
Tešić  Marko 《Synthese》2019,196(3):1097-1129
Synthese - In their 2010 (Erkenntnis 73:393–412) paper, Dizadji-Bahmani, Frigg, and Hartmann (henceforth ‘DFH’) argue that the generalized version of the Nagel–Schaffner...  相似文献   
167.
168.
169.
Journal of Religion and Health - The study was conducted to determine the levels of usage of complementary and integrative health (CIH) approaches and the symptoms experienced by Turkish patients...  相似文献   
170.
Although Islam is the fastest growing religion worldwide, only few studies have investigated body image in Muslim women, and no study has investigated body checking. Therefore, the present study examined whether body image, body checking, and disordered eating differ between veiled and unveiled Muslim women, Christian women, and atheist women. While the groups did not differ regarding body dissatisfaction, unveiled Muslim women reported more checking than veiled Muslim and Christian women, and higher bulimia scores than Christian. Thus, prevention against eating disorders should integrate all women, irrespective of religious affiliation or veiling, with a particular focus on unveiled Muslim women.  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