全文获取类型
收费全文 | 749篇 |
免费 | 14篇 |
专业分类
教育 | 524篇 |
科学研究 | 32篇 |
各国文化 | 9篇 |
体育 | 78篇 |
信息传播 | 120篇 |
出版年
2023年 | 16篇 |
2020年 | 10篇 |
2019年 | 16篇 |
2018年 | 29篇 |
2017年 | 30篇 |
2016年 | 31篇 |
2015年 | 12篇 |
2014年 | 26篇 |
2013年 | 266篇 |
2012年 | 14篇 |
2011年 | 19篇 |
2010年 | 16篇 |
2009年 | 10篇 |
2008年 | 14篇 |
2007年 | 17篇 |
2006年 | 14篇 |
2005年 | 11篇 |
2004年 | 11篇 |
2003年 | 8篇 |
2002年 | 10篇 |
2001年 | 4篇 |
2000年 | 7篇 |
1999年 | 8篇 |
1998年 | 6篇 |
1997年 | 10篇 |
1996年 | 6篇 |
1995年 | 5篇 |
1994年 | 6篇 |
1993年 | 5篇 |
1992年 | 12篇 |
1991年 | 4篇 |
1990年 | 12篇 |
1989年 | 8篇 |
1988年 | 3篇 |
1987年 | 7篇 |
1986年 | 4篇 |
1984年 | 6篇 |
1983年 | 4篇 |
1982年 | 7篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 6篇 |
1973年 | 3篇 |
1971年 | 3篇 |
1968年 | 3篇 |
1924年 | 2篇 |
1923年 | 3篇 |
排序方式: 共有763条查询结果,搜索用时 46 毫秒
11.
A hybrid two-stage flowshop scheduling problem was considered which involves m identical parallel machines at Stage 1 and a burn-in processor M at Stage 2, and the makespan was taken as the minimization objective. This scheduling problem is NP-hard in general. We divide it into eight subcases. Except for the following two subcases: (1) b≥ an, max{m, B} 〈 n; (2) a1 ≤ b ≤ an, m ≤ B 〈 n, for all other subcases, their NP-hardness was proved or pointed out, corresponding approximation algorithms were conducted and their worst-case performances were estimated. In all these approximation algorithms, the Multifit and PTAS algorithms were respectively used, as the jobs were scheduled in m identical parallel machines. 相似文献
12.
The Consistency and Concomitants of Inhibition: Some of the Children, All of the Time 总被引:6,自引:1,他引:6
Kenneth H. Rubin Paul D. Hastings Shannon L. Stewart Heather A. Henderson Xinyin Chen 《Child development》1997,68(3):467-483
Toddlers displaying extremely inhibited behavior may be at risk for becoming socially withdrawn. However, behavioral inhibition may be a multifaceted characteristic, and its concurrent relation to toddler wariness with peers has not been examined. In this study, 108 toddlers (54 females) and their mothers were observed in novel situations involving unfamiliar settings, adults, and peers. Vagal tone, temperament, separation-reunion behavior, and maternal oversolicitousness also were assessed. There was little consistency of inhibited behavior across the 3 situations. Consistently inhibited toddlers had fearful temperaments, showed distress following maternal separation, and had mothers who were warm and controlling but unresponsive to children's cues during interaction. Toddlers with highly fearful temperaments and highly oversolicitous mothers were the most inhibited across contexts. 相似文献
13.
14.
A consumer advocate, two childbirth educators, and a certified nurse-midwife each provide commentary on the effectiveness of and potential uses for the Evidence Basis for the Ten Steps of Mother-Friendly Care. 相似文献
15.
Yumary Ruiz Shaina Riciputi Vincent Guilamo-Ramos Stewart C. Alexander 《American journal of sexuality education》2019,14(2):165-185
While long-acting reversible contraception (LARC) reduces risk of repeat-births, use remains low among rural Latinx adolescent mothers. This qualitative study identified perspectives about factors that influence LARC use among this population. Participants were dyads of parenting Latinx adolescent daughters and their mothers (n?=?9 dyads) and nurses (n?=?17). Findings revealed themes specific to this vulnerable population including (a) distinct ways LARC characteristics fit into parenting teenagers’ lives, (b) supportive health care climate toward LARCs, and (c) factors that inhibit LARC uptake. The study has implications for sexuality education that seeks to reduce repeat-births among this population. 相似文献
16.
A survey was conducted of 231 psychologists from a midwestern state. Investigators surveyed perceptions of job satisfaction, job stability, and quality of professional life. Responses of rural and urban professionals were compared. While resembling urban colleagues in most regards, rural psychologists appear more satisfied with working environments and job policies. Discussion is presented on differences between the two groups on a number of variables influencing perceptions. 相似文献
17.
Krista J. Stewart 《Psychology in the schools》1984,21(2):211-214
A project is described that involved school psychology students in doing applied research. The possible impact that implementing such a plan might have on creating cooperative research opportunities, on providing training in applied research, and on influencing the school's perception of the school psychologist's role is considered. 相似文献
18.
Ian B. Stewart 《Cultural and Social History》2017,14(5):599-620
The fin de siècle witnessed radical shifts in the intellectual and cultural landscapes of the British Isles in the context of a general revolt against Victorian values. E. E. Fournier d’Albe – physicist, spiritualist, inventor and Pan-Celticist – personified the ability of intellectuals to latch onto and advance new trends, made available by the emergent intellectual pluralism. Like many contemporaries he rejected traditional religion, but he also disdained scientific materialism, and sought a deeper metaphysical meaning to life, pursued through his various interests. Influenced by the totalising theories of figures like Herbert Spencer and Ernst Haeckel, Fournier concocted his own brand of scientific monism, rejecting materialism, embracing spiritualism, and ever optimistic in the notion of scientific progress, even in the wake of the carnage of the Great War. The article aims to give Fournier a fuller historical treatment, allowing his story to add to understanding of the milieus in which he lived and operated, and revealing how his monistic philosophy incorporated some of the disparate cultural strands explored by intellectuals in the fin de siècle reaction against conventional Victorian ideals. 相似文献
19.
Christian Swann Lee Crust Patricia Jackman Stewart A. Vella Mark S. Allen Richard Keegan 《Journal of sports sciences》2017,35(23):2272-2280
Clutch performance is improved performance under pressure. However, little research has examined the psychological state experienced by athletes in these situations. Therefore, this study qualitatively examined the subjective experience underlying clutch performance across a range of sports (e.g., team, individual) and standards (Olympic to recreational athletes). Sixteen athletes (Mage = 27.08 years; SD = 6.48) took part in in-depth, semi-structured interviews primarily after an exceptional performance (M = 4.38 days later; SD = 3.14). Data were analysed inductively and thematically. Clutch states involved 12 characteristics, including heightened and deliberate concentration, intense effort, and heightened awareness, which distinguished the experience of clutch from other optimal psychological states such as flow. Other characteristics, such as perceptions of control, were also reported and supported previous experimental research on clutch. These findings present in-depth qualitative insights into the psychological state underlying clutch performance, and are discussed in relation to the existing literature on optimal psychological states in sport. 相似文献
20.