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   8463篇
  免费   212篇
  国内免费   1篇
管理学   1140篇
民族学   53篇
人口学   747篇
丛书文集   26篇
理论方法论   737篇
综合类   87篇
社会学   3814篇
统计学   2072篇
  2023年   48篇
  2022年   26篇
  2021年   54篇
  2020年   124篇
  2019年   201篇
  2018年   213篇
  2017年   317篇
  2016年   232篇
  2015年   144篇
  2014年   219篇
  2013年   1607篇
  2012年   255篇
  2011年   268篇
  2010年   206篇
  2009年   212篇
  2008年   223篇
  2007年   206篇
  2006年   224篇
  2005年   207篇
  2004年   182篇
  2003年   169篇
  2002年   192篇
  2001年   212篇
  2000年   217篇
  1999年   206篇
  1998年   145篇
  1997年   136篇
  1996年   114篇
  1995年   105篇
  1994年   148篇
  1993年   117篇
  1992年   139篇
  1991年   140篇
  1990年   123篇
  1989年   109篇
  1988年   96篇
  1987年   97篇
  1986年   94篇
  1985年   94篇
  1984年   99篇
  1983年   75篇
  1982年   79篇
  1981年   57篇
  1980年   64篇
  1979年   65篇
  1978年   51篇
  1977年   53篇
  1976年   42篇
  1975年   47篇
  1974年   41篇
排序方式: 共有8676条查询结果,搜索用时 16 毫秒
161.
162.
Despite rapid expansion in the maternal and child health and family planning services, there have been few attempts made to study the extent of utilisation of these services and their impact. The present study reports a simple method evolved in the quantification of utilisation of maternal care services (called maternal care receptivity - MCR), the relationship of factors such as age, parity, caste of the women and the distance of the health centre on the MCR and the impact of MCR on perinatal and neonatal mortalities. An inverse relationship was observed between MCR and perinatal and neonatal mortality rates and the two rates were three times less among babies born to mothers with high MCR scores compared to those with poor MCR scores.  相似文献   
163.
164.
Sex differences in three communication behaviors consistently found to be more common among females than males — smiling, gazing at one's partner, and sentence complexity — were examined through analysis of interviews with 78 institutionalized mentally retarded adults. While females were significantly more likely than males to smile or laugh, and tended to use longer, more complex sentences, the commonly observed sex difference in gazing failed to generalize to a retarded sample. These findings clarify limits on the generalizability of sex differences beyond college students and other normal populations.This research was partially supported by a grant to the Texas Tech University Research and Training Center in Mental Retardation from the Rehabilitation Services Administration, Department of Health Education, and Welfare.  相似文献   
165.
166.
S. K. Gaisie 《Demography》1975,12(1):21-34
This paper attempts to measure infant and child mortality levels and also to determine their structure by utilizing the results of the 1968–1969 National Demographic Sample Survey which was conducted under the directorship of the author. Among the major problems encountered in the exercise are the adjustment of the current raw mortality data and the estimation of infant and child mortality from independent source material. The estimated infant mortality rates range from 56 per 1,000 live births in the Accra Capital District to 192 in the Upper Region during the late 1960’s. The urban rate is lower than the rural rate, 98 as against 161 per 1,000 live births. A large proportion of the deaths among children aged 0–4 occur in the second year of life, and deaths in this age group account for the bulk of the deaths within the age group 1–4 years.  相似文献   
167.
168.
A.R. Montazemi  K.M. Gupta 《Omega》1997,25(6):643-658
The objective of this study was to determine the impact of task information (TI) provided by an interface agent during the idea evaluation and integration step of the problem formulation stage of the problem solving process. The effectiveness assessment was based on solving diagnostic decision problems in the domain of complex industrial machinery. Ten domain experts participated in this study. Decision support was provided by a case-based reasoning system. Findings suggest that TI provided by the interface agent had no effect on the decision maker's performance, nor on the associated cognitive effort. However, a verbal protocol analysis revealed that the ten subjects used the interface agent to verify their decision processes. The results and their implications are discussed with respect to current findings in the area of decision support systems.  相似文献   
169.
Consider the problem of partitioning n nonnegative numbers into p parts, where part i can be assigned ni numbers with ni lying in a given range. The goal is to maximize a Schur convex function F whose ith argument is the sum of numbers assigned to part i. The shape of a partition is the vector consisting of the sizes of its parts, further, a shape (without referring to a particular partition) is a vector of nonnegative integers (n1,..., np) which sum to n. A partition is called size-consecutive if there is a ranking of the parts which is consistent with their sizes, and all elements in a higher-ranked part exceed all elements in the lower-ranked part. We demonstrate that one can restrict attention to size-consecutive partitions with shapes that are nonmajorized, we study these shapes, bound their numbers and develop algorithms to enumerate them. Our study extends the analysis of a previous paper by Hwang and Rothblum which discussed the above problem assuming the existence of a majorizing shape. This research is partially supported by ROC National Science grant NSC 92-2115-M-009-014.  相似文献   
170.
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