全文获取类型
收费全文 | 5798篇 |
免费 | 231篇 |
国内免费 | 2篇 |
专业分类
6031篇 |
出版年
2020年 | 74篇 |
2019年 | 81篇 |
2018年 | 97篇 |
2017年 | 101篇 |
2016年 | 104篇 |
2015年 | 79篇 |
2014年 | 118篇 |
2013年 | 613篇 |
2012年 | 156篇 |
2011年 | 203篇 |
2010年 | 124篇 |
2009年 | 146篇 |
2008年 | 156篇 |
2007年 | 188篇 |
2006年 | 148篇 |
2005年 | 151篇 |
2004年 | 157篇 |
2003年 | 157篇 |
2002年 | 180篇 |
2001年 | 83篇 |
2000年 | 67篇 |
1999年 | 74篇 |
1998年 | 95篇 |
1997年 | 107篇 |
1996年 | 82篇 |
1995年 | 84篇 |
1994年 | 84篇 |
1993年 | 104篇 |
1992年 | 93篇 |
1991年 | 73篇 |
1990年 | 69篇 |
1989年 | 76篇 |
1988年 | 70篇 |
1987年 | 78篇 |
1986年 | 63篇 |
1985年 | 61篇 |
1984年 | 86篇 |
1983年 | 83篇 |
1982年 | 96篇 |
1981年 | 82篇 |
1980年 | 92篇 |
1979年 | 80篇 |
1978年 | 104篇 |
1977年 | 99篇 |
1976年 | 84篇 |
1975年 | 107篇 |
1974年 | 84篇 |
1973年 | 61篇 |
1972年 | 54篇 |
1971年 | 57篇 |
排序方式: 共有6031条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
Investigating Correlates of Suicide Among Male Youth: Questioning the Close Affinity Between Suicide Attempts and Deaths 下载免费PDF全文
William Feigelman PhD Thomas Joiner PhD Zohn Rosen PhD Caroline Silva MS 《Suicide & life-threatening behavior》2016,46(2):191-205
This study was based on a sample of male high school students who completed National Longitudinal Adolescent Health Surveys in 1994, 1995, and 2001. We studied these students prospectively, comparing those who later died by suicide (n = 21) with those who were still living (n = 10,101). We employed chi‐square and analysis of variance tests for statistical significance between suicide decedents and living respondents. Results showed suicide decedents were more likely to have experienced the suicide loss of another family member, to have been expelled from school, to have engaged in more delinquent actions including fighting, and to have greater involvement with the criminal justice system. Although one might have expected suicide casualties to have exhibited a greater amount of suicidal thoughts, attempts, and higher incidences of suicidality among their friends, our analyses did not find that these factors were associated with actual suicides. Should these findings be replicated, this would point to a need to refine youth suicide risk assessments. Collecting life histories, as well as identifying patterns of delinquency and fighting, may serve as more potentially fruitful means for assessing genuine suicide risk than some traditional risk assessment methods.z 相似文献
995.
996.
William J. FitzPatrick 《Canadian journal of philosophy》2018,48(3-4):548-568
AbstractEthical realists hold (i) that our ethical concepts, thoughts, and claims are in the business of representing ethical reality, by representing evaluative or normative properties and facts as aspects of reality, and (ii) that such representations are at least sometimes accurate. Non-naturalist realists add the further claim that ethical properties and facts are ultimately non-natural, though they are nonetheless worldly. My aim is threefold: to elucidate the sort of representation involved in ethical evaluation on realist views; to clarify what exactly is represented and how non-naturalism comes into the picture for non-naturalists; and to defend worldly non-naturalism against some objections. The first question addressed is how we should model evaluation on any realist view, which should in turn guide the identification of which properties and facts are credibly regarded as ‘evaluative’ ones. Then the question is: what role might non-natural properties and facts play, and how are they related to what is represented in ethical evaluation? Once that is clear, we will be in a position to answer certain objections to non-naturalist realism from Jackson, Gibbard, Bedke, and Dreier. I argue that the objections all mischaracterize the role played by non-natural properties and facts on plausible versions of non-naturalist realism. 相似文献
997.
William Vincent Massey Megan Babkes Stellino Megan Wilkison Meredith Whitley 《Journal of Applied Sport Psychology》2018,30(1):45-63
The purpose of this study was to examine the impact of a peer-leadership training program on youth from a low-income urban school district. The methodological approach was grounded in community-based participatory research, in which a multicomponent school-based recess and physical activity program was examined. Data included 15 focus groups conducted with 77 fourth- and fifth-grade participants and semistructured interviews with 13 adult leaders. Results of a thematic content analysis suggest that decisions to join the program, role expectations, and training received impacted leadership development, personal development, and transfer of skills to other domains. 相似文献
998.
We examined the relationship between chronic procrastination, hoarding, attention deficit hyperactivity disorder (ADHD), and a computer measure of continuous performance with 84 adult patients evaluated for diagnoses. Patients were administered the General Procrastination Inventory, the Saving Inventory-Revised, the Adult ADHD Self-Report Scale and the IVA + Plus Continuous Performance Test. Procrastination scores correlated negatively with auditory attention scores, while self-reported hoarding tendencies correlated negatively with visual attention. Measures of procrastiation, hoarding, and ADHD were positively correlated. Implications and limitations of findings are discussed as well as directions for futher research. 相似文献
999.
Sarah Kahle William T. Utendale Keith F. Widaman Paul D. Hastings 《Journal of abnormal child psychology》2018,46(2):237-249
The current report examined the longitudinal relations between cognitive self-regulation, physiological self-regulation, and externalizing problems. At age 4 (n = 98; 49 girls) and 6 (n = 87; 42 girls), children completed the Day-Night task, which taps the inhibitory control dimension of executive function. During the task, cardiac activity was measured and respiratory sinus arrhythmia (RSA) was derived as an index of parasympathetic activity. Mothers reported on externalizing problems. A cross-lagged path model was used to estimate longitudinal predictions while controlling for stability in all constructs over time. Earlier inhibitory control negatively predicted later externalizing problems, but not vice versa. However, RSA reactivity moderated this link; better inhibitory control predicted fewer externalizing problems only when reactivity to the Day-Night task ranged from mild RSA suppression to RSA augmentation. Externalizing problems at 6 years were highest among preschoolers who augmented RSA but showed poor inhibitory control performance, suggesting that risk for psychopathology may be better delineated by viewing self-regulation from an integrated, multi-system perspective. 相似文献
1000.
Craig J. Bryan Tanya Goodman Wayne Chappelle Lillian Prince William Thompson 《Military psychology》2018,30(5):437-448
US Air Force remote warrior personnel include a range of military personnel composed of remotely piloted aircraft aircrew, intelligence operators, and cyber warfare operators. Job duties in these professions entail long work hours, rotating shifts, and regular engagement in combat operations. Although research has identified a number of factors correlated with elevated burnout and emotional distress in this population, little is known about the unique needs of discrete subgroups of distressed personnel. In a sample of 7,550 US Air Force remote warriors, results of latent class analysis yielded four distinct classes. Three of the four reported moderately elevated burnout and job dissatisfaction but differed with respect to demographics and development career stage. The fourth group reported significantly higher levels of emotional distress, burnout, job dissatisfaction, and problems in living. This latter group was comparable to the mid-career group with respect to demographics, although this group had much lower levels of responsibility and indicators of career advancement. Results suggest that, among remote warrior personnel, there are several subtypes of elevated emotional distress. Prevention and intervention strategies that are matched to each subtype may yield better occupational and mental health outcomes than universal, “one size fits all” strategies. 相似文献