全文获取类型
收费全文 | 6943篇 |
免费 | 90篇 |
国内免费 | 5篇 |
专业分类
教育 | 4516篇 |
科学研究 | 790篇 |
各国文化 | 297篇 |
体育 | 598篇 |
文化理论 | 30篇 |
信息传播 | 807篇 |
出版年
2022年 | 39篇 |
2021年 | 66篇 |
2020年 | 108篇 |
2019年 | 167篇 |
2018年 | 196篇 |
2017年 | 199篇 |
2016年 | 190篇 |
2015年 | 120篇 |
2014年 | 163篇 |
2013年 | 1188篇 |
2012年 | 152篇 |
2011年 | 156篇 |
2010年 | 141篇 |
2009年 | 153篇 |
2008年 | 202篇 |
2007年 | 215篇 |
2006年 | 159篇 |
2005年 | 130篇 |
2004年 | 123篇 |
2003年 | 96篇 |
2002年 | 102篇 |
2001年 | 122篇 |
2000年 | 143篇 |
1999年 | 129篇 |
1998年 | 58篇 |
1997年 | 50篇 |
1996年 | 70篇 |
1995年 | 65篇 |
1994年 | 64篇 |
1993年 | 58篇 |
1992年 | 114篇 |
1991年 | 100篇 |
1990年 | 88篇 |
1989年 | 121篇 |
1988年 | 82篇 |
1987年 | 77篇 |
1986年 | 81篇 |
1985年 | 109篇 |
1984年 | 74篇 |
1983年 | 78篇 |
1982年 | 82篇 |
1981年 | 62篇 |
1980年 | 65篇 |
1979年 | 78篇 |
1978年 | 77篇 |
1977年 | 59篇 |
1976年 | 60篇 |
1974年 | 48篇 |
1973年 | 45篇 |
1969年 | 42篇 |
排序方式: 共有7038条查询结果,搜索用时 187 毫秒
991.
OBJECTIVE: The purpose of this study was to clinically assess children's reactions to videocolposcopy with real-time observation of magnified anogenital images (VCO), and to evaluate whether these reactions are affected by patient or other characteristics such as response to preparation, disclosure of child sexual abuse (CSA), or examination findings. METHOD: Consecutive cases of children ages less than 18 years referred to a children's hospital clinic for nonemergent evaluation of suspected CSA during 1997 through 1999 were studied. We noted the child's response with clinical observation before and after videocolposcopy, and used the Genital Examination Distress Scale (GEDS) after evaluation. We compared these responses to patient gender, age, ethnicity, pubertal status, disclosure of child sexual abuse (CSA), and physical examination findings using univariate and regression analyses. RESULTS: Two hundred twenty-seven children (mean age 7.2 years, range 0-17) underwent videocolposcopy, of whom 55.1% disclosed sexual abuse and 17.2% had a positive examination. More than 80% were female, prepubertal, and non-Hispanic White. Most (85%) watched their examination on the monitor and were either cooperative or enthusiastic before and after videocolposcopy. Fewer very young children (ages 0-3 years) or female adolescents (13-17 years) watched the monitor. Summed GEDS scores were strongly correlated with observed responses after the procedure (p = .01), and children with CSA disclosure were three times more likely to watch the monitor and five times more likely than those without disclosure to have improved comfort. Other patient characteristics were not significantly associated with patient reaction to VCO. CONCLUSIONS: Most children are interested in watching their anogenital examination using magnified real-time images obtained during videocolposcopy and tolerate the procedure well. The GEDS is highly correlated with subjective clinical observation. While some children may particularly benefit from participating in their examination by using VCO, long-term effects of the evaluation and any relationship of a child's reaction to videocolposcopy with their history of sexual victimization remain to be established. 相似文献
992.
Engineering Design is rightfully regarded as a key element within all university Engineering courses and most laboratory assignments and project work seek to optimise the student's acquisition of knowledge and understanding of this process. Within this paper Engineering Design has been classified into a new 'hierarchy of task level' each one defined by an increased degree of design freedom that an Engineer has to consider. It is argued that this classification accurately reflects the varying complexity of tasks found within real world industrial environment. The optimal matching of these task levels to university course assignments is discussed and limitations identified. The need for further design experience within a wider industrial context is shown to be essential if the nature of design freedom is to be fully appreciated by the next generation of professional Engineers. 相似文献
993.
Breanne K. Litts Yasmin B. Kafai Debora A. Lui Justice T. Walker Sari A. Widman 《Journal of Science Education and Technology》2017,26(5):494-507
Learning about circuitry by connecting a battery, light bulb, and wires is a common activity in many science classrooms. In this paper, we expand students’ learning about circuitry with electronic textiles, which use conductive thread instead of wires and sewable LEDs instead of lightbulbs, by integrating programming sensor inputs and light outputs and examining how the two domains interact. We implemented an electronic textiles unit with 23 high school students ages 16–17 years who learned how to craft and code circuits with the LilyPad Arduino, an electronic textile construction kit. Our analyses not only confirm significant increases in students’ understanding of functional circuits but also showcase students’ ability in designing and remixing program code for controlling circuits. In our discussion, we address opportunities and challenges of introducing codeable circuit design for integrating maker activities that include engineering and computing into classrooms. 相似文献
994.
Larisa T. McLoughlin Barbara A. Spears Carmel M. Taddeo Daniel F. Hermens 《Psychology in the schools》2019,56(6):945-958
It is well documented that cyberbullying can lead to adverse mental health outcomes. Separate research shows that higher levels of social connectedness may result in more positive mental health outcomes, however, the relationship between social connectedness and mental health in the face of cyberbullying is not yet fully understood. An online survey of 229 adolescents (aged 12–17 years) was conducted, and we examined experiences of cyberbullying, levels of social connectedness, depression, anxiety, and stress. Structural equation modeling suggested that social connectedness may act as a protective buffer against the negative mental health outcomes associated with cybervictimization. This paper highlights the fact that social connectedness plays an important role for young people, the more frequently they are victimized. The implications of these findings are far reaching and suggest that understanding the role of social connectedness may be crucial to interventions that seek to mitigate the effects of cyberbullying. 相似文献
995.
996.
A randomized controlled trial of a home-visiting intervention aimed at preventing relationship problems in depressed mothers and their infants 总被引:1,自引:0,他引:1
This study examined the effect of a mother–baby intervention on the quality of mother–child interaction, infant–mother attachment security, and infant socioemotional functioning in a group of depressed mothers with infants aged 1–12 months. A randomized controlled trial compared an experimental group ( n = 35) receiving the intervention (8–10 home visits) with a control group ( n = 36) receiving parenting support by telephone. There were assessments pre, post, and follow-up after 6 months. The intervention had positive effects on the quality of mother–infant interaction. Infants in the experimental group had higher scores for attachment security and for one aspect of socioemotional functioning, namely, competence. The intervention proved successful in preventing deterioration of the quality of mother–child interaction. 相似文献
997.
Three models of the relations of coping efficacy, coping, and psychological problems of children of divorce were investigated. A structural equation model using cross-sectional data of 356 nine- to twelve-year-old children of divorce yielded results that supported coping efficacy as a mediator of the relations between both active coping and avoiding coping and psychological problems. In a prospective longitudinal model with a subsample of 162 of these children, support was found for Time 2 coping efficacy as a mediator of the relations between Time 1 active coping and Time 2 internalizing of problems. Individual growth curve models over four waves also found support for coping efficacy as a mediator of the relations between active coping and psychological problems. No support was found for alternative models of coping as a mediator of the relations between efficacy and symptoms or for coping efficacy as a moderator of the relations between coping and symptoms. 相似文献
998.
999.
1000.
Edward Wahesh Gulsah Kemer Ben T. Willis Christopher D. Schmidt 《Counselor Education & Supervision》2017,56(4):274-288
The authors examined the peer feedback exchanged in 2 supervision groups of counselors‐in‐training (CITs). CITs generated 169 statements grouped into 10 clusters representing 5 regions of peer feedback: counselor focus and engagement, insight‐oriented skills, exploratory skills, therapeutic alliance, and intervention activities. Both positive and corrective peer feedback was exchanged on topics ranging from counselor performance skills to case conceptualization. 相似文献