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   22678篇
  免费   100篇
  国内免费   1篇
  22779篇
  2023年   20篇
  2022年   14篇
  2021年   22篇
  2020年   49篇
  2019年   62篇
  2018年   3542篇
  2017年   2864篇
  2016年   2294篇
  2015年   251篇
  2014年   125篇
  2013年   312篇
  2012年   647篇
  2011年   2464篇
  2010年   2568篇
  2009年   1516篇
  2008年   1771篇
  2007年   2253篇
  2006年   102篇
  2005年   257篇
  2004年   229篇
  2003年   149篇
  2002年   103篇
  2001年   149篇
  2000年   167篇
  1999年   88篇
  1998年   37篇
  1997年   44篇
  1996年   29篇
  1994年   19篇
  1992年   40篇
  1991年   54篇
  1990年   46篇
  1989年   42篇
  1988年   42篇
  1987年   28篇
  1986年   18篇
  1985年   23篇
  1984年   22篇
  1983年   18篇
  1982年   14篇
  1981年   15篇
  1979年   20篇
  1976年   16篇
  1974年   16篇
  1973年   16篇
  1971年   17篇
  1970年   14篇
  1969年   16篇
  1968年   16篇
  1967年   16篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
992.
Although theoretical results for several algorithms in many application domains were presented during the last decades, not all algorithms can be analyzed fully theoretically. Experimentation is necessary. The analysis of algorithms should follow the same principles and standards of other empirical sciences. This article focuses on stochastic search algorithms, such as evolutionary algorithms or particle swarm optimization. Stochastic search algorithms tackle hard real-world optimization problems, e.g., problems from chemical engineering, airfoil optimization, or bio-informatics, where classical methods from mathematical optimization fail. Nowadays statistical tools that are able to cope with problems like small sample sizes, non-normal distributions, noisy results, etc. are developed for the analysis of algorithms. Although there are adequate tools to discuss the statistical significance of experimental data, statistical significance is not scientifically meaningful per se. It is necessary to bridge the gap between the statistical significance of an experimental result and its scientific meaning. We will propose some ideas on how to accomplish this task based on Mayo’s learning model (NPT*).  相似文献   
993.
This paper studies long-term norms concerning actions. In Meyer’s Propositional Deontic Logic (PD e L), only immediate duties can be expressed, however, often one has duties of longer durations such as: “Never do that”, or “Do this someday”. In this paper, we will investigate how to amend PD e L so that such long-term duties can be expressed. This leads to the interesting and suprising consequence that the long-term prohibition and obligation are not interdefinable in our semantics, while there is a duality between these two notions. As a consequence, we have provided a new analysis of the long-term obligation by introducing a new atomic proposition I (indebtedness) to represent the condition that an agent has some unfulfilled obligation. Presented by Jacek Malinowski  相似文献   
994.
Our study explores the clinical and non-clinical characteristics associated with medication use among children with serious emotional disturbance who are referred into community-based family-driven system of care settings. Using data collected as part of the Comprehensive Community Mental Health Services for Children and Their Families Program initiative, our study provides results from analyses completed on 7,009 children and adolescents with serious emotional disturbance. Using both bivariate and multivariate statistical analyses, the researchers found that females entering systems of care were less likely to have received medication in the 6-months prior to entry, as were children of African-American and Native-American heritage compared to children from non-Hispanic White heritage. Children referred from mental health, child welfare or who were self-referred were more likely to use medications than those referred from juvenile justice. Children with histories of prior inpatient, outpatient, day treatment, or school-based services were between 2 and 4 times more likely to use medications than children without such histories. Children with family histories of mental illness and those who were Medicaid recipients were also more likely to use medications. Family income was also positively related to medication use and younger children were more likely to use medications than older children. Implications of the findings are discussed.  相似文献   
995.
Previous empirical research has been unable to find a sufficient correlation between subjective well-being and per capita income, being hampered by limited longitudinal information and an inability to account for the predictions of competing theories. We bring new evidence to this question by exploiting a long and complete time-series from the Eurobarometer Survey, 1973–2002 allowing an examination of trends in life satisfaction across 15 European countries employing a modified version of Kendall’s Tau. Our results show that while current GDP growth does not affect trends in well-being, accelerations in GDP growth do. In addition, faster GDP growth and faster growth of government consumption than in neighbouring countries induces positive trends in life satisfaction. Our findings are consistent with the predictions of aspirations theory and the theory of reference group comparisons.  相似文献   
996.
Decades of research have examined the structure of self-consciousness in adults and its relationship to social anxiety. This study examined the structure of self-consciousness via the Self-Consciousness Scales (Fenigstein et al., J. Consult. Clin. Psychol. 43:522–527, 1975) in a school sample of 175 children and young adolescents (92 girls; mean age = 11.5). Confirmatory factor analysis best supported a five-factor solution (Internal State Awareness, Self-Reflectiveness, Appearance Consciousness, Style Consciousness and Social Anxiety). Although some factor based subscales evidenced low internal consistencies, convergent and discriminant correlations with self-report measures of social phobia, negative affect, and positive affect as well as parent-report measures of internalizing and externalizing problems provided additional support for the five-factor model. Future studies should further examine the multidimensional nature as well as the developmental course of self-consciousness and its relation to social anxiety longitudinally.
Charmaine K. HigaEmail:
  相似文献   
997.
This article considers the question of whether it is meaningful to speak of privacy rights in public spaces, and the possibility of such rights framing the basis for regulating or restricting the use of surveillance technologies such as closed circuit television (CCTV). In particular, it responds to a recent article by Jesper Ryberg that suggests that there is little difference between being watched by private individuals and CCTV cameras, and instead argues that state surveillance is qualitatively different from (and more problematic than) surveillance by ‘lonely old ladies’.
Benjamin GooldEmail:
  相似文献   
998.
This article brings out certain philosophical difficulties in Lacan’s account of the mirror stage, the initial moment of the subject’s development. For Lacan, the “original organization of the forms of the ego” is “precipitated” in an infant’s self-recognition in a mirror image; this event is explicitly prior to any social interactions. A Hegelian objection to the Lacanian account argues that social interaction and recognition of others by infants are necessary prerequisites for infants’ capacity to recognize themselves in a mirror image. Thus mutual recognition with another, rather than self-recognition in a mirror, is what makes possible subsequent ego-formation and self-consciousness. This intersubjective critique suggests that many of the psychoanalytic consequences that Lacan derives from the mirror stage (e.g., alienation, narcissism, and aggressivity) may need to be rethought.
Richard A. LynchEmail:
  相似文献   
999.
This paper examines three accounts of the sleeping beauty case: an account proposed by Adam Elga, an account proposed by David Lewis, and a third account defended in this paper. It provides two reasons for preferring the third account. First, this account does a good job of capturing the temporal continuity of our beliefs, while the accounts favored by Elga and Lewis do not. Second, Elga’s and Lewis’ treatments of the sleeping beauty case lead to highly counterintuitive consequences. The proposed account also leads to counterintuitive consequences, but they’re not as bad as those of Elga’s account, and no worse than those of Lewis’ account.
Christopher J. G. MeachamEmail:
  相似文献   
1000.
This article investigates the types of intentionality involved in human–technology relations. It aims to augment Don Ihde’s analysis of the relations between human beings and technological artifacts, by analyzing a number of concrete examples at the limits of Ihde’s analysis. The article distinguishes and analyzes three types of “cyborg intentionality,” which all involve specific blends of the human and the technological. Technologically mediated intentionality occurs when human intentionality takes place “through” technological artifacts; hybrid intentionality occurs when the technological actually merges with the human; and composite intentionality is the addition of human intentionality and the intentionality of technological artifacts.
Peter-Paul VerbeekEmail:
  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