全文获取类型
收费全文 | 1281篇 |
免费 | 11篇 |
国内免费 | 9篇 |
专业分类
教育 | 683篇 |
科学研究 | 209篇 |
各国文化 | 21篇 |
体育 | 235篇 |
综合类 | 17篇 |
文化理论 | 5篇 |
信息传播 | 131篇 |
出版年
2022年 | 7篇 |
2020年 | 5篇 |
2017年 | 8篇 |
2015年 | 8篇 |
2014年 | 8篇 |
2013年 | 15篇 |
2012年 | 66篇 |
2011年 | 113篇 |
2010年 | 45篇 |
2009年 | 12篇 |
2008年 | 67篇 |
2007年 | 53篇 |
2006年 | 74篇 |
2005年 | 82篇 |
2004年 | 59篇 |
2003年 | 55篇 |
2002年 | 61篇 |
2001年 | 37篇 |
2000年 | 47篇 |
1999年 | 21篇 |
1998年 | 8篇 |
1997年 | 13篇 |
1996年 | 8篇 |
1995年 | 17篇 |
1994年 | 9篇 |
1993年 | 14篇 |
1992年 | 22篇 |
1991年 | 21篇 |
1990年 | 28篇 |
1989年 | 31篇 |
1988年 | 14篇 |
1987年 | 17篇 |
1986年 | 24篇 |
1985年 | 15篇 |
1984年 | 27篇 |
1983年 | 13篇 |
1982年 | 17篇 |
1981年 | 13篇 |
1980年 | 10篇 |
1978年 | 5篇 |
1973年 | 5篇 |
1972年 | 5篇 |
1960年 | 5篇 |
1959年 | 10篇 |
1958年 | 7篇 |
1957年 | 7篇 |
1956年 | 8篇 |
1955年 | 6篇 |
1954年 | 8篇 |
1925年 | 7篇 |
排序方式: 共有1301条查询结果,搜索用时 250 毫秒
91.
Previous research has found that children engage in Level 2 visual perspective-taking, that is, the understanding that others may see things in a different way, between 4 and 5 years of age (e.g., J. H. Flavell, B. A. Everett, K. Croft, & E. R. Flavell, 1981). This ability was reexamined in 36-month-olds using color filters. In Experiment 1 (N = 24), children had to recognize how an object looked to an adult when she saw it through a color filter. In Experiment 2 (N = 24), a novel production test was applied. Results of both studies show that 36-month-olds know how an object looks to another person. The discussion focuses on the psychological requirements of visual perspective-taking and its relation to other "theory of mind" abilities, such as the distinction between appearance and reality and understanding false belief. 相似文献
92.
McNeil NM Fyfe ER Petersen LA Dunwiddie AE Brletic-Shipley H 《Child development》2011,82(5):1620-1633
This study examined whether practice with arithmetic problems presented in a nontraditional problem format improves understanding of mathematical equivalence. Children (M age = 8;0; N = 90) were randomly assigned to practice addition in one of three conditions: (a) traditional, in which problems were presented in the traditional "operations on left side" format (e.g., 9 + 8 = 17); (b) nontraditional, in which problems were presented in a nontraditional format (e.g., 17 = 9 + 8); or (c) no extra practice. Children developed a better understanding of mathematical equivalence after receiving nontraditional practice than after receiving traditional practice or no extra practice. Results suggest that minor differences in early input can yield substantial differences in children's understanding of fundamental concepts. 相似文献
93.
The aim of the longitudinal study was to investigate whether a computer application designed for remedial reading training can enhance letter knowledge, reading accuracy, fluency, and spelling of at-risk children. The participants, 7-year-old Finnish school beginners (N=166), were assigned to 1 of 3 groups: (a) regular remedial reading intervention (n=25), (b) computer-assessed reading intervention (n=25), and (c) mainstream reading instruction (n=116). Based on the results, computer-assisted remedial reading intervention was highly beneficial, whereas regular type of intervention was less successful. The results indicated that at-risk children require computer-based letter-name and letter-sound training to acquire adequate decoding and spelling skills, and to reach the level of their non-at-risk peers. 相似文献
94.
Laaksonen T Sariola H Johansson A Jern P Varjonen M von der Pahlen B Sandnabba NK Santtila P 《Child abuse & neglect》2011,35(7):480-490
Objective
We examined (1) the prevalence of childhood sexual abuse (CSA) experiences as a function of cohort and gender, (2) the prevalence of factors associated with CSA as a function of cohort and whether the association of these factors with CSA remained the same irrespective of cohort, and (3) whether any cohort differences could be explainable by cohort differences in reporting bias.Method
We used the responses of 4,561 men (M = 29, SD = 7 years) and 8,361 female (M = 29, SD = 7 years) Finnish participants who responded to the Childhood Trauma Questionnaire-Short Form as well as questions regarding family structure.Results
The prevalence of CSA experiences varied between 0.7-4.6% for men and 1.8-7.5% for women depending on the item. Younger cohorts reported less CSA as well as less of the risk factors (physical neglect and abuse, emotional neglect and abuse, parental substances abuse, not growing up with both biological parents) that were positively associated with the likelihood of CSA. The effects of these risk factors did not vary as a function of the cohort. Also, the declining trend was not explainable by social desirability being higher in the younger cohorts.Conclusions
The results suggest that there is a real decline in the prevalence of CSA and it is associated with a simultaneous decline in factors associated with CSA. 相似文献95.
96.
97.
为使合格球队的训练和比赛过程更具有现代化,研究人员提出了增加远距离投篮有效性的结构内容模式,并将投篮训练作为运动员技、战术的组成部分。投篮训练是一项专门性训练,要在不同情况下完成不同方式的投篮练习。通过各种不同的训练方式来掌握投篮技术并提高投篮的准确性。该模式是用来为每一名选手选取远距离和超长距离投篮方式,完善投篮技术,选择技、战术行为,制定不同训练周期和阶段个人和全队的投篮训练。结论:提高篮球远距离投篮效果的模式可以达到如下目的:1)队员的有效安排;2)完善投篮技术;3)为每一名选手选择不同的投篮训练模式;4)每一名队员投篮准确性的数据资料可以为全队的战术安排提供参考;5)定性地规划每一名球员和球队的投篮训练并作为球队技、战术训练的主要组成部分。 相似文献
98.
99.
This paper describes a simple method for fabricating a series of poly(ethylene glycol) diacrylate (PEG-DA) hydrogel microstructures inside microfluidic channels as probe for proteins and glucose. In order to demonstrate the feasibility of this newly developed system, bovine serum albumin (BSA) was chosen as a model protein. PEG microcolumns were used for the parallel detection of multiple components. Using tetrabromophenol blue (TBPB) and the horseradish peroxidase/glucose oxidase reaction system, bovine serum albumin (BSA) and glucose in human urine were detected by color changes. The color changes for BSA within a concentration range of 1-150 μM, and glucose within a range of 50 mM-2 M could be directly distinguished by eyes or precisely identified by optical microscope. To show the practicability of the gel particle array, protein and glucose concentrations of real human urine samples were determined, resulting in a good correlation with hospital analysis. Notably, only a 5 μL sample was needed for a parallel measurement of both analytes. Conveniently, no special readout equipment or power source was required during the diagnosis process, which is promising for an application in rapid point-of-care diagnosis. 相似文献
100.
In this paper, a poly(dimethylsiloxane) microchip with amperometric detector was developed for the electrophoretic separation and determination of neurotransmitters. For increasing the separation efficiency, the microchannel is modified by polystyrene sulphonate∕polystyrene nano-sphere self-assembly coating. A stable electro-osmotic flow (EOF) and higher separation efficiency are obtained in proposed modified microchannel. Under optimized conditions, dopamine, epinephrine, catechol, and serotonin are acceptably baseline separated in this 3.5 cm length separation channel with the theoretical plate number from 4.6?×?10(4) to 2.1?×?10(5) per meter and resolution from 1.29 to 12.5. The practicability of proposed microchip is validated by the recovery test with cerebrospinal fluid as real sample which resulted from 91.7% to 106.5%. 相似文献