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   6729篇
  免费   243篇
管理学   1037篇
民族学   42篇
人口学   671篇
丛书文集   23篇
教育普及   1篇
理论方法论   612篇
综合类   74篇
社会学   3176篇
统计学   1336篇
  2023年   56篇
  2022年   40篇
  2021年   65篇
  2020年   120篇
  2019年   179篇
  2018年   241篇
  2017年   319篇
  2016年   245篇
  2015年   148篇
  2014年   210篇
  2013年   1054篇
  2012年   241篇
  2011年   199篇
  2010年   198篇
  2009年   178篇
  2008年   187篇
  2007年   191篇
  2006年   228篇
  2005年   149篇
  2004年   153篇
  2003年   110篇
  2002年   143篇
  2001年   177篇
  2000年   155篇
  1999年   144篇
  1998年   106篇
  1997年   93篇
  1996年   101篇
  1995年   73篇
  1994年   63篇
  1993年   92篇
  1992年   98篇
  1991年   105篇
  1990年   80篇
  1989年   80篇
  1988年   69篇
  1987年   70篇
  1986年   64篇
  1985年   78篇
  1984年   68篇
  1983年   72篇
  1982年   47篇
  1981年   41篇
  1980年   43篇
  1979年   50篇
  1978年   39篇
  1977年   35篇
  1976年   35篇
  1975年   34篇
  1974年   42篇
排序方式: 共有6972条查询结果,搜索用时 593 毫秒
951.
952.
Smoking prevention program for children: a review   总被引:1,自引:0,他引:1  
  相似文献   
953.
Recent work on the U.S. concludes that one or more illusions are responsible for the empirically observed "flypaper effect." Using annual Canadian data for the period 1962–84, we test the "single-illusion" and "dual-illusion" specifications currently in the literature. While the empirical results support the dual-illusion specification, it is not the unambiguous choice over single-illusion specifications as previously found. Further, the nature of the grant system in Canada raises questions about whether illusions or real factors produce the empirical results.  相似文献   
954.
This paper reviews the literature on part-time employment and presents data from a survey of part-time social workers in Melbourne. Information on part-time employment by age and gender is presented and industrial issues relevant to part-time work are discussed. Data on demographic characteristics, working conditions and employer perception of advantages and disadvantages of part-time social work are presented from a postal survey of Melbourne health and social welfare agencies.  相似文献   
955.
This paper examines the argument that the exchange of powers and responsibilities between government and producer group interests (and, in particular, trade unions) under a bargained form of corporatism confers industrial relations benefits in the form of reduced strikes and economic benefits via lessened inflationary pressures. Focusing largely on the inflation question, an alternative argument is entered to the effect that corporatist experimentation threatens directly to exacerbate the problem in part correctly diagnosed by certain corporatist analysts in their discussion of the fundamental determinants of inflation. Empirical evidence with a bearing on these issues is evaluated. Helpful comments from Joe Reid Jr., Ken Mayhew, Stan Siebert, and the participants in the labor workshop at Hannover are gratefully acknowledged. The usual disclaimers attach.  相似文献   
956.
Les configurations de la différenciation spatiale en 1971 sont examinées à partir des données par secteurs de recensement et on trouve qu'elles sont assez proches de celles de 1961. Le niveau socioéconomique a varié principalement par secteur, la situation familiale a varié par zone, et le statut ethnique n'a varié ni par l'un ni par l'autre d'une manière marquante. Bien que les changements décennaux soient petits, nos résultats sont en opposition avec l'hypothèse évolutionniste de Schnore en ce qui concerne la différenciation socioéconomique. Dans la majorité des villes canadiennes, le statut des secteurs de recensement du centre ville s'est effectivement élevé et le statut des secteurs des faubourgs a baissé. La situation familiale devient plus différenciée par zone, ce qui soutient l'hypothèse évolutionniste. Le statut ethnique décrit seulement de faibles configurations par zone et par secteur pour les deux années étudiées.
Using census tract data, patterns of spatial differentiation in 1971 are examined and found to be fairly close to those that existed in 1961. Spatial patterning of socioeconomic status was dominantly sectoral, family status was zonal, and ethnic status not markedly one orthe other. Though the changes during the decade are small, our findings run contrary to the evolutionary hypothesis of Schnore with regard to socioeconomic differentiation. The majority of Canadian cities actually increased in the status of inner-city census tracts and decreased in the status of outlying, suburban tracts. Family status is becoming more zonally differentiated, which is supportive of the evolutionary hypothesis. Ethnic status describes only rather weak zonal and sectoral patterns in either year.  相似文献   
957.
Prolonged work scenarios with demands for sustained performance are increasingly common. Because sleep loss inevitably compromises functioning in such situations, napping has been proposed as a countermeasure. The optimal timing of the nap relative to its benefits for performance and mood is not known, however. To address this issue, 41 healthy adults were permitted a two-hour nap at one of five times during a 56-hour period of intermittent work, with no other sleep. Naps were placed 12 hours apart, near the circadian peak (P) or trough (T), and were preceded by 6(P), 18(T), 30(P), 42(T), or 54(P) hours of wakefulness. Work test bouts occurred every few hours and consisted of a variety of psychomotor and cognitive tasks as well as mood scales completed at the beginning, middle and end of each bout. A total of eight performance and 24 mood parameters were derived from the bouts and compared between groups at all test points prior to and following the naps. An estimate of the extent to which each nap condition differed from the control (P54) condition was derived by totalling the proportion of test points that yielded statistically significant results relative to the total number of tests conducted both before and after naps.

Although all performance and most mood parameters displayed a circadian-modulated deterioration as the protocol progressed, a nap appeared to attentuate the extent of this change in all performance parameters but not in mood parameters. Overall, the timing of the nap across days and within the circadian cycle was irrelevant to its effect on performance, suggesting that it diminished the intrusion of sleepiness into behavioural functioning, even though subjects were phenomenally unaware of this benefit.  相似文献   
958.
959.
960.
RJ Ball  T Burns 《Omega》1974,2(3):295-311
Econometric analysis is concerned with the quantitative relationships between economic variables and it can provide an important input into the decision making process of managers. Typically econometrics differs from other apsects of management science in that it considers problems primarily, though not exclusively, from a background of economics rather than of other disciplines and behaviour is usually dealt with at higher levels of data aggregation than the individual firm.This paper considers some applications of typical econometrics to the general area of managerial decision making, where primarily the techniques have a role to play in assisting the general process of data analysis. Initially discussion is pointed towards the use of the analysis for predictive purposes and the contrast with time series methods. Subsequently examples are presented where the objective is to obtain a better understanding of individual economic relationships that aim to be important inputs into the decision making process, for example cost and revenue analysis. Finally, an example is given of how these ideas contribute more generally to the activity of model building for the firm as a whole both for the purpose of forecasting and policy simulation.  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