全文获取类型
收费全文 | 13815篇 |
免费 | 187篇 |
国内免费 | 34篇 |
专业分类
教育 | 9459篇 |
科学研究 | 1725篇 |
各国文化 | 82篇 |
体育 | 986篇 |
综合类 | 9篇 |
文化理论 | 96篇 |
信息传播 | 1679篇 |
出版年
2022年 | 91篇 |
2021年 | 146篇 |
2020年 | 228篇 |
2019年 | 306篇 |
2018年 | 464篇 |
2017年 | 486篇 |
2016年 | 437篇 |
2015年 | 282篇 |
2014年 | 437篇 |
2013年 | 2330篇 |
2012年 | 350篇 |
2011年 | 380篇 |
2010年 | 328篇 |
2009年 | 302篇 |
2008年 | 338篇 |
2007年 | 322篇 |
2006年 | 274篇 |
2005年 | 226篇 |
2004年 | 260篇 |
2003年 | 206篇 |
2002年 | 203篇 |
2001年 | 298篇 |
2000年 | 315篇 |
1999年 | 268篇 |
1998年 | 167篇 |
1997年 | 187篇 |
1996年 | 177篇 |
1995年 | 119篇 |
1994年 | 149篇 |
1993年 | 105篇 |
1992年 | 237篇 |
1991年 | 191篇 |
1990年 | 182篇 |
1989年 | 209篇 |
1988年 | 197篇 |
1987年 | 165篇 |
1986年 | 181篇 |
1985年 | 174篇 |
1984年 | 134篇 |
1983年 | 154篇 |
1982年 | 119篇 |
1981年 | 118篇 |
1980年 | 97篇 |
1979年 | 157篇 |
1978年 | 117篇 |
1977年 | 103篇 |
1976年 | 99篇 |
1975年 | 81篇 |
1974年 | 94篇 |
1973年 | 96篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
Methods for identifying students with learning disabilities continue to be an area of controversy. The present investigation examined the impact of implementing statewide guidelines for the identification of these students. Data were collected from multidisciplinary team reports on 718 students with learning disabilities who were referred and labeled during the 1983-84 school year (before implementation of statewide learning disability guidelines) and 790 students who were identified during 1987-88 (after implementation of the guidelines). The results of the study revealed that the statewide guidelines significantly changed the characteristics of students who were identified. After the implementation of the guidelines, students with much more severe academic problems were identified. These students were much more likely to have a severe discrepancy and be chronically failing in the regular classroom. However, even with explicit, widely accepted guidelines, approximately one third of all students identified in 1987-88 failed to meet the stated criteria for identification. The implications of these findings for professional practice and future research are discussed. 相似文献
122.
123.
A. N. Gurov Yu. G. Goncharova G. B. Bubyakin 《Scientific and Technical Information Processing》2016,43(2):88-94
The concept of “open access” to scientific and teaching information has become one of the specific forms of the worldwide trend towards the formation of global interactive knowledge. This paper presents the basic information on open access (OA) to scientific and teaching information, its current status, financing options, problems and prospects of development, and the participation of Russia in this process. 相似文献
124.
V. I. Dorofeeva A. G. Motin D. N. Nikol’skii Yu. S. Fedyaev 《Scientific and Technical Information Processing》2016,43(3):166-173
The main aspects of the creation of a monitoring system for the research activities of the members of a higher-education institution are considered. The scientific activities of the lecturers and members of Turgenev Orel State University is used as the basis. It is expected that this system will be an efficient tool for optimal managerial decisions at all levels. 相似文献
125.
126.
In light of recent theories of meaningful media that suggest a host of psychological benefits, the present study uniquely extends the boundaries of the effects of reality TV from simply offering pleasure, diversion, and amusement to its viewers to also providing deep insight and meaning. In particular, a between-subjects experiment (N = 143) examined differences in affective, cognitive, and motivational responses to lifestyle transforming versus game based reality programs. Findings indicate that lifestyle transforming reality TV produced stronger feelings of elevation and perceptions of the program as moving and thought-provoking than game reality TV, which in turn increased motivations for altruism. Avenues for future research and theoretical implications of meaningful and inspiring reality TV for positive psychology are discussed. 相似文献
127.
V. K. Wadhawan 《Resonance》2005,10(11):27-41
A structure is an assembly that serves an engineering function. It is reasonable to expect that all engineering design should
be smart, and not dumb. But one can still make a distinction between smartly designed structures and smart structures. The
latter term has acquired a specific technical meaning over the last few decades. A smart structure is that which has the ability
to respond adaptively in a pre-designed useful and efficient manner to changes in environmental conditions, including any
changes in its own condition; the response is adaptive in the sense that two or more stimuli or inputs may be received as
anticipated and yet there is a single response function as per design. Smartness ensures that the structure gives optimum
performance under a variety of environmental conditions. While structures with some degree of smartness have been designed
from times immemorial, the current activity and excitement in this field derives its impetus from the level of sophistication
achieved in materials science, information technology, measurement science, sensors, actuators, signal processing, nanotechnology,
cybernetics, artificial intelligence, and biomimetics. 相似文献
128.
129.
A multi-analytical approach for the study of brazilwood and its lake pigments was carried out based on historically accurate reconstructions. Recipes for brazilwood lakes from the fifteenth century technical text Livro de como se fazem as cores and the Winsor & Newton nineteenth century colourman's archive were reproduced and compared. Both primary sources allowed for the successful preparation of brazilwood lake pigments with colours that vary from light pink to dark red. The main steps and ingredients for the manufacture of these pigments were common in both sources, particularly the addition of Al3+ in the form of alum, and calcium carbonate (chalk). Reconstructions revealed that the latter acts as a pH buffer and filler, controlling the pH at which the lake pigment precipitates. The main difference between the two sources is that the nineteenth century recipes give the quantities for all ingredients, the precise temperatures and time, and achieved higher relative pigment yields (75% versus 45%). Full chemical characterisation of the reconstructions provided detailed information on the individual steps in the pigment manufacture and revealed that the presence of calcium sulphate dihydrate (gypsum) in the final pigment was a result of its formation in situ. Infrared, reflectance, and fluorescence spectroscopy proved to be essential and complementary techniques: while infrared was used to characterise additives and binders, reflectance and fluorescence data were fundamental for identifying the chromophore. The pigments and paints produced can now be used as standards for the identification and investigation of brazilwood lake pigments found in artworks. 相似文献
130.
K. R. Shivanna 《Resonance》2016,21(11):1007-1018
After the pollen grain reaches the stigma through outsourced agents (pollinators), the next step before fertilization is to select the right type of pollen. Similar to a marriage in human beings, fiowering plants also have evolved elaborate screening process to select the right pollen grains and to reject the wrong ones. Even after initial screening for the right pollen, the pistil imposes a tough competition amongst them, comparable to a swayamvara of Indian mythology, to select the best available pollen. Flowering plants have evolved into a matriarchal society. The selection of the male partner is totally the prerogative of the mother (pistil); the boy (pollen grain) and the girl (ovule) has no say in this selection. 相似文献