全文获取类型
收费全文 | 10930篇 |
免费 | 158篇 |
国内免费 | 8篇 |
专业分类
教育 | 7448篇 |
科学研究 | 1181篇 |
各国文化 | 357篇 |
体育 | 858篇 |
综合类 | 4篇 |
文化理论 | 76篇 |
信息传播 | 1172篇 |
出版年
2021年 | 114篇 |
2020年 | 159篇 |
2019年 | 228篇 |
2018年 | 292篇 |
2017年 | 318篇 |
2016年 | 304篇 |
2015年 | 185篇 |
2014年 | 248篇 |
2013年 | 2033篇 |
2012年 | 237篇 |
2011年 | 252篇 |
2010年 | 212篇 |
2009年 | 227篇 |
2008年 | 272篇 |
2007年 | 256篇 |
2006年 | 214篇 |
2005年 | 194篇 |
2004年 | 215篇 |
2003年 | 153篇 |
2002年 | 143篇 |
2001年 | 172篇 |
2000年 | 195篇 |
1999年 | 172篇 |
1998年 | 103篇 |
1997年 | 106篇 |
1996年 | 95篇 |
1995年 | 81篇 |
1994年 | 87篇 |
1993年 | 99篇 |
1992年 | 147篇 |
1991年 | 162篇 |
1990年 | 159篇 |
1989年 | 173篇 |
1988年 | 132篇 |
1987年 | 128篇 |
1986年 | 126篇 |
1985年 | 164篇 |
1984年 | 136篇 |
1983年 | 125篇 |
1982年 | 111篇 |
1981年 | 90篇 |
1980年 | 103篇 |
1979年 | 148篇 |
1978年 | 93篇 |
1977年 | 96篇 |
1976年 | 85篇 |
1975年 | 82篇 |
1974年 | 93篇 |
1973年 | 84篇 |
1971年 | 75篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Shoudong Wang Shulin Liu Jie Wang Kengo Yokosho Bin Zhou Ya-Chi Yu Zhi Liu Wolf B Frommer Jian Feng Ma Li-Qing Chen Yuefeng Guan Huixia Shou Zhixi Tian 《国家科学评论(英文版)》2020,7(11):1776
Soybean accounts for more than half of the global production of oilseed and more than a quarter of the protein used globally for human food and animal feed. Soybean domestication involved parallel increases in seed size and oil content, and a concomitant decrease in protein content. However, science has not yet discovered whether these effects were due to selective pressure on a single gene or multiple genes. Here, re-sequencing data from >800 genotypes revealed a strong selection during soybean domestication on GmSWEET10a. The selection of GmSWEET10a conferred simultaneous increases in soybean-seed size and oil content as well as a reduction in the protein content. The result was validated using both near-isogenic lines carrying substitution of haplotype chromosomal segments and transgenic soybeans. Moreover, GmSWEET10b was found to be functionally redundant with its homologue GmSWEET10a and to be undergoing selection in current breeding, leading the the elite allele GmSWEET10b, a potential target for present-day soybean breeding. Both GmSWEET10a and GmSWEET10b were shown to transport sucrose and hexose, contributing to sugar allocation from seed coat to embryo, which consequently determines oil and protein contents and seed size in soybean. We conclude that past selection of optimal GmSWEET10a alleles drove the initial domestication of multiple soybean-seed traits and that targeted selection of the elite allele GmSWEET10b may further improve the yield and seed quality of modern soybean cultivars. 相似文献
72.
Jean B. Schumaker Joseph B. Fisher Lisa D. Walsh Paula E. Lancaster 《Learning disabilities research & practice》2020,35(4):180-200
In each of two studies, teachers were randomly assigned to either a Virtual Workshop (VW) group that used a computerized professional development program or an Actual Workshop (AW) group that participated in face-to-face professional development, including discussion, feedback, and collaboration. In both studies, teachers’ posttest scores related to their knowledge of the Question Exploration Routine and their plans for using it were significantly higher than their pretest scores. In Study 2, both groups’ posttest scores with regard to implementation and planning of the routine were significantly greater than their pretest scores. There were no significant differences between the groups at posttesting on any measure. The posttest knowledge scores of the whole groups of students and the subgroups of students with LD being taught by both groups of teachers were significantly higher than their pretest scores. All teachers indicated that they were satisfied with the training and the routine. VW teachers in both studies indicated that they were satisfied with the software program. 相似文献
73.
Self‐efficacy pertains to individuals’ belief about their capability to accomplish a task; consequently, school counselors’ positive self‐efficacy is a theoretically based prerequisite for their facilitation of school‐based interventions. In addition, school counselor‐led interventions and comprehensive, developmenta l guidance programs benefit students’ personal social, academic, and career development. Therefore, this investigation examined the contribution of practicing school counselors’ (N = 693) self‐efficacy in relation to the frequency of their programmatic service delivery. The findings indicate that participants’ self‐efficacy scores contributed to the frequency of their programmatic service delivery (48% of the variance explained). Implications for school counselors, supervisors, and educational researchers are discussed. 相似文献
74.
Danica G. Hays Rebecca E. Michel Hannah B. Bayne Anita A. Neuer Colburn Jayne Smith Myers 《Journal of College Counseling》2015,18(1):49-65
Relationship violence is a salient concern on college campuses today, and psychoeducational groups may be an appropriate prevention format. This article describes a study measuring the impact of college student participation in the HEART (Help End Abusive Relationships Today) program, a series of group sessions designed to increase knowledge and awareness of relationship violence. Findings indicated significant changes for group participants postintervention. Implications and recommendations for college counselors are discussed. 相似文献
75.
76.
77.
Christina Hamme Peterson Sean B. Hall Juleen K. Buser 《Counselor Education & Supervision》2016,55(2):80-94
Counselors (N = 911) reported the research skills needed for practice and subsequent research training needs. Findings indicate that counselors have a high need for research skills at work, but training needs differ significantly by counselor type. Recommendations include increasing emphasis on single‐case design, survey design, and widely available data analysis tools. 相似文献
78.
79.
80.
Attention disorders in the school population include attention deficit, hyperactivity and conduct disorders. A key concept for distinguishing hyperactive from attention disorders is behavioural inhibition as advocated by Barkley, a prominent American researcher. However, the concept itself needs to be understood because, as argued in this paper, there are two kinds of inhibition: Pavlov's original concept and the American one. These should be differentiated if the abnormal conditions associated with attention and hyperactivity are to be rationally connected to cognitive characteristics, rather than to be solely based on clinical symptoms and behavioural ratings. We suggest a consensus on the concept of inhibition and a unified view of attention disorders integrating cognitive and behavioural manifestations. Finally, the importance of basing remediation on a theoretically supported and rationally derived set of cognitive training tasks for the amelioration of inattention and hyperactivity is offered. 相似文献