全文获取类型
收费全文 | 8870篇 |
免费 | 261篇 |
专业分类
各国政治 | 449篇 |
工人农民 | 409篇 |
世界政治 | 506篇 |
外交国际关系 | 263篇 |
法律 | 5617篇 |
中国共产党 | 3篇 |
中国政治 | 59篇 |
政治理论 | 1749篇 |
综合类 | 76篇 |
出版年
2020年 | 108篇 |
2019年 | 144篇 |
2018年 | 208篇 |
2017年 | 221篇 |
2016年 | 215篇 |
2015年 | 152篇 |
2014年 | 156篇 |
2013年 | 972篇 |
2012年 | 231篇 |
2011年 | 229篇 |
2010年 | 191篇 |
2009年 | 214篇 |
2008年 | 263篇 |
2007年 | 223篇 |
2006年 | 257篇 |
2005年 | 227篇 |
2004年 | 232篇 |
2003年 | 205篇 |
2002年 | 215篇 |
2001年 | 268篇 |
2000年 | 269篇 |
1999年 | 193篇 |
1998年 | 119篇 |
1997年 | 121篇 |
1996年 | 111篇 |
1995年 | 99篇 |
1994年 | 96篇 |
1993年 | 112篇 |
1992年 | 184篇 |
1991年 | 200篇 |
1990年 | 180篇 |
1989年 | 181篇 |
1988年 | 162篇 |
1987年 | 180篇 |
1986年 | 176篇 |
1985年 | 164篇 |
1984年 | 157篇 |
1983年 | 167篇 |
1982年 | 96篇 |
1981年 | 91篇 |
1980年 | 77篇 |
1979年 | 106篇 |
1978年 | 76篇 |
1977年 | 74篇 |
1976年 | 60篇 |
1975年 | 60篇 |
1974年 | 63篇 |
1973年 | 73篇 |
1972年 | 64篇 |
1968年 | 53篇 |
排序方式: 共有9131条查询结果,搜索用时 0 毫秒
291.
292.
293.
294.
295.
Managers concerned with the performance of their organizations will exploit available social, administrative, and human capital resources. However, extant theory and mixed empirical evidence leave the effect of social capital on performance unclear. The gains from these norms of reciprocity, participation, networking, and trust may disproportionately benefit only some of their clients, leading to disparities in outcomes among diverse clienteles. We argue that in such contexts, management will put in place policies to counter these disparities. Indeed, our empirical evidence from the management of public education supports the expectation that an institutional commitment to diversity successfully mitigates the uneven effects of social capital on organizational performance. This finding carries important implications for public management and equity in public policy outcomes and may be of particular relevance to management of outcomes relying on co‐production. 相似文献
296.
Kate E. Mulgrew Diana Volcevski-Kostas Peter G. Rendell 《Journal of youth and adolescence》2014,43(1):92-103
There is limited research that has examined experimentally the effects of muscular images on adolescent boys’ body image, with no research specifically examining the effects of music television. The aim of the current study was to examine the effects of viewing muscular and attractive singers in music video clips on early, mid, and late adolescent boys’ body image, mood, and schema activation. Participants were 180 boys in grade 7 (mean age = 12.73 years), grade 9 (mean age = 14.40 years) or grade 11 (mean age = 16.15 years) who completed pre- and post-test measures of mood and body satisfaction after viewing music videos containing male singers of muscular or average appearance. They also completed measures of schema activation and social comparison after viewing the clips. The results showed that the boys who viewed the muscular clips reported poorer upper body satisfaction, lower appearance satisfaction, lower happiness, and more depressive feelings compared to boys who viewed the clips depicting singers of average appearance. There was no evidence of increased appearance schema activation but the boys who viewed the muscular clips did report higher levels of social comparison to the singers. The results suggest that music video clips are a powerful form of media in conveying information about the male ideal body shape and that negative effects are found in boys as young as 12 years. 相似文献
297.
Hayley A. Hamilton Mark van der Maas Angela Boak Robert E. Mann 《Journal of youth and adolescence》2014,43(7):1163-1175
Research indicates that subjective perceptions of socioeconomic status (SES) affect aspects of health and behavior. There has been little research attention to how objective (e.g., education) and subjective aspects of SES may differ in their influence on the substance use of adolescent immigrants. The present study examined whether the associations between subjective SES and substance use, and between parental education and substance use varied by immigrant generation. Data were derived from the 2011 Ontario Student Drug Use and Health Survey, a representative survey of students in the 7th to 12th grade. The sample for this study consisted of 9177 students 12–19 years of age; 48.4 % were female, 66.4 % were White/European, 5.2 % Black/Afro-Caribbean, 16.4 % Asian and 12 % other. Results indicated that subjective SES was more strongly associated with cannabis and alcohol use among first-generation immigrants than among adolescents of other immigrant generations even after adjusting for parental education. First-generation immigrants with low subjective SES had a lower probability of cannabis and regular alcohol use, but there was no difference in use between immigrant generations at high subjective SES. The associations between parental education and cannabis and alcohol use did not significantly vary with immigrant generation. The findings highlight the importance of status beliefs among adolescents, particularly among first-generation immigrants, and suggest that further research attention to such beliefs would enhance our understanding of SES and its links to adolescent health risk behaviors. 相似文献
298.
Jungmeen Kim-Spoon Julee P. Farley Christopher Holmes Gregory S. Longo Michael E. McCullough 《Journal of youth and adolescence》2014,43(5):745-756
Empirical evidence suggests that religiousness is related negatively to adolescent substance use; yet, we know little about how such protective effects might occur. The current study examined whether parents’ and adolescents’ religiousness are associated positively with parental, religious, and self-monitoring, which in turn are related to higher self-control, thereby related to lower adolescent substance use. Participants were 220 adolescents (45 % female) who were interviewed at ages 10–16 and again 2.4 years later. Structural equation modeling analyses suggested that higher adolescents’ religiousness at Time 1 was related to lower substance use at Time 2 indirectly through religious monitoring, self-monitoring, and self-control. Higher parents’ religiousness at Time 1 was associated with higher parental monitoring at Time 2, which in turn was related to lower adolescent substance use at Time 2 directly and indirectly through higher adolescent self-control. The results illustrate that adolescents with high awareness of being monitored by God are likely to show high self-control abilities and, consequently, low substance use. The findings further suggest that adolescents’ religiousness as well as their religious environments (e.g., familial context) can facilitate desirable developmental outcomes. 相似文献
299.
Emily E. Fairbanks M.S. Jennifer Turner M.S. Junkun Ma Ph.D. Jorn Yu Ph.D. 《Journal of forensic sciences》2020,65(6):1954-1960
Trigger pull is the force that needs to be exerted on the trigger to discharge a firearm. The measurement of trigger pull can assist in the evaluation of the safety, function, and manufacturing characteristics associated with a firearm during the forensic firearm examination process. Nonetheless, the accuracy and uncertainty of trigger pull measurements may be affected by the measuring device, test procedure, and environmental conditions. In this work, an innovative finger-trigger interface device was developed to facilitate accurate trigger pull measurements. The idea was to reduce the variation related to the position of the measurement device on the trigger in existing measuring methods and devices. Three force sensors based on different technologies were initially evaluated. While two of the three sensors failed to produce data, the miniature capacitive plate sensor exhibited high precision and a linear response over the range of typical trigger pulls. To examine the effects of the finger-trigger interface on trigger pull measurement, different sensor housing prototypes were designed in silico and 3D printed for the construction of three finger-trigger interface devices. The performance of each finger-trigger interface device was evaluated by measuring the trigger pulls of several selected firearms and comparing the data to a previously published study. Our preliminary results demonstrated the novel finger-trigger interface device offered a new way to measure trigger pull in situ with acceptable accuracy and precision. 相似文献
300.
The study has two main purposes. First, the study explores core ethical values and behaviors from the perspective of Thai public service organizational leaders. Second, the study investigates the extent to which public sector leaders in Thailand consider Buddhist-based mindfulness practice to be a potentially effective mechanism for reinforcing core ethical values and behaviors in the public sector in Thailand. Using interview data derived from in-depth semi-structured interviews with 12 senior public sector officials in Thailand, the analysis elicits four dimensions of core ethical values and behaviors that are perceived by Thai public service organizational leaders as central to ethical behavior in the public sector. The study also sheds light on the interviewees' positive perceptions towards mindfulness and the role its associated practices can play in promoting ethical decision making and behavior in the public sector in Thailand. 相似文献