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   4699篇
  免费   14篇
  国内免费   1篇
  4714篇
  2020年   4篇
  2019年   5篇
  2018年   123篇
  2017年   100篇
  2016年   190篇
  2015年   99篇
  2014年   47篇
  2013年   101篇
  2012年   265篇
  2011年   258篇
  2010年   23篇
  2009年   36篇
  2008年   42篇
  2007年   40篇
  2006年   46篇
  2005年   1323篇
  2004年   663篇
  2003年   449篇
  2002年   135篇
  2001年   30篇
  2000年   13篇
  1999年   28篇
  1998年   4篇
  1996年   4篇
  1994年   11篇
  1992年   25篇
  1991年   41篇
  1990年   58篇
  1989年   45篇
  1988年   26篇
  1987年   42篇
  1986年   37篇
  1985年   29篇
  1984年   25篇
  1983年   20篇
  1979年   34篇
  1978年   11篇
  1977年   7篇
  1976年   11篇
  1975年   28篇
  1974年   32篇
  1973年   30篇
  1972年   25篇
  1971年   25篇
  1970年   17篇
  1969年   19篇
  1968年   17篇
  1967年   17篇
  1966年   16篇
  1965年   7篇
排序方式: 共有4714条查询结果,搜索用时 0 毫秒
901.
A number of recent papers have suggested that the series of time intervals produced in continuation tapping may have fractal properties. This proposition, nevertheless, was only based on the visual appraisal of graphical results, and was not statistically supported. In the present study, we applied the ARMA/ARFIMA modeling procedures proposed by Wagenmakers, Farrell, and Ratcliff (2005) to test for the presence of long-range dependencies in continuation tapping data. Our results demonstrate the presence of long-range dependencies in most series and offer strong support for the hypothesis that fluctuations in tapping series are fractal in nature.  相似文献   
902.
This research presents an initial documentation of Israeli women’s sense of insecurity during the Second Intifada (2001–2005). Drawing on feminist security theory and the intersectional approach to gender, we hypothesized that women’s familiar tendency to develop high levels of stress following political violence would be related to previous sexual and domestic victimization, to economic distress and ethnic discrimination among minority women, and to the cultural role of care workers among women of all socio-economic backgrounds. A sample of 552 women self-completed a cluster of questionnaires addressing a broad array of topics, and results confirmed most of the research hypotheses. The discussion highlights the multiple articulations of gender, militarism, and security and their possible implications for policies of conflict resolution.  相似文献   
903.
To make technology research more effective and to deal with fierce cost competition, technology research should be more focused on radical innovation and needs to adopt a more end-user-focused approach. Product improvement is already quite often building on knowledge collected around consumers’ experiences with these products to come with a next, improved generation of products. However, in case of creating novel products from “scratch,” this will be more difficult. The user-centered research approach including insights, scenarios, and experience prototypes provides a good method to incorporate the consumer perspective in the earliest stages of the product creation process. The development of the Ambilight TV will be used as a case to illustrate this approach.  相似文献   
904.
Some researchers argue that task switching involves task-set reconfiguration-that is, changing the existing task set to perform a different task. Although this idea is intriguing, it is often unclear what is reconfigured and which processes are involved in reconfiguration. We addressed these issues by defining task sets, identifying differences between them, and obtaining evidence that was diagnostic of reconfiguration. In two experiments, subjects performed relative judgment tasks that involved comparing a target with a reference point that repeated or switched across trials. The task was the same on every trial, but the task set was not, because a task-set parameter-the reference point-had to be changed. Target-reference point distance effects that changed with the reference point provided diagnostic evidence that reconfiguration occurred, and this reconfiguration led to switch costs. We discuss how our approach can be generalized to define reconfiguration more clearly in other task-switching situations. nt|mis|This research was supported by Grants BCS 0133202 and BCS 0446806 from the National Science Foundation to G.D.L.  相似文献   
905.
Countless studies have recently purported to demonstrate effects of goal priming; however, it is difficult to muster unambiguous support for the claims of these studies because of the lack of clear criteria for determining whether goals, as opposed to alternative varieties of mental representations, have indeed been activated. Therefore, the authors offer theoretical guidelines that may help distinguish between semantic, procedural, and goal priming. Seven principles that are hallmarks of self-regulatory processes are proposed: Goal-priming effects (a) involve value, (b) involve postattainment decrements in motivation, (c) involve gradients as a function of distance to the goal, (d) are proportional to the product of expectancy and value, (e) involve inhibition of conflicting goals, (f) involve self-control, and (g) are moderated by equifinality and multifinality. How these principles might help distinguish between automatic activation of goals and priming effects that do not involve goals is discussed.  相似文献   
906.
We aimed to expand upon the demographic characteristics and gender differences among those who have met someone on the Internet who they later met offline and had sex with as well as any relationship with cybersex, sexually transmitted infections, and online sexual problems. We analyzed data collected through an online questionnaire in 2002 in Sweden including a total population of 1836 respondents of which 1458 used the Internet for sexual purposes. Of those, 35% men and 40% women reported to have met offline sex partners online. The majority reported an occurrence of one to two times, whereas 10% reported six or more times. The analysis suggested women aged 34-49 and 50-65 years, homo- and bisexual men, and singles more likely to have this experience. They were also more likely to have engaged in cybersex. No relationships were found with sexually transmitted infections or online sexual problems. The results suggest that using the Internet to find sex partners may be less hazardous for the general Internet users than pointed out by prior research about this behavior often focusing on specific sub groups of Internet users.  相似文献   
907.
908.
909.
In recent years, some people have held that a radical relativist position is defensible in some philosophically interesting cases, including future contingents, predicates of personal taste, evaluative predicates in general, epistemic modals, and knowledge attributions. The position is frequently characterized as denying that utterance-truth is absolute. I argue that this characterization is inappropriate, as it requires a metaphysical substantive contention with which moderate views as such need not be committed. Before this, I also offer a more basic, admittedly less exciting alternative characterization of the position, in terms of departing from the Kaplan–Lewis–Stalnaker two-dimensional framework.  相似文献   
910.
It is often assumed that indeterminacy in mereological relations—in particular, indeterminacy in which collections of objects have fusions—leads immediately to indeterminacy in what objects there are in the world. This assumption is generally taken as a reason for rejecting mereological vagueness. The purpose of this paper is to examine the link between mereological vagueness and existential vagueness. I hope to show that the connection between the two forms of vagueness is not nearly so clear-cut as has been supposed.  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