全文获取类型
收费全文 | 14572篇 |
免费 | 231篇 |
国内免费 | 11篇 |
专业分类
教育 | 10136篇 |
科学研究 | 1752篇 |
各国文化 | 131篇 |
体育 | 1033篇 |
综合类 | 17篇 |
文化理论 | 190篇 |
信息传播 | 1555篇 |
出版年
2022年 | 101篇 |
2021年 | 144篇 |
2020年 | 214篇 |
2019年 | 287篇 |
2018年 | 414篇 |
2017年 | 457篇 |
2016年 | 405篇 |
2015年 | 268篇 |
2014年 | 384篇 |
2013年 | 2548篇 |
2012年 | 346篇 |
2011年 | 330篇 |
2010年 | 315篇 |
2009年 | 272篇 |
2008年 | 297篇 |
2007年 | 309篇 |
2006年 | 281篇 |
2005年 | 247篇 |
2004年 | 279篇 |
2003年 | 239篇 |
2002年 | 261篇 |
2001年 | 315篇 |
2000年 | 343篇 |
1999年 | 264篇 |
1998年 | 158篇 |
1997年 | 187篇 |
1996年 | 187篇 |
1995年 | 129篇 |
1994年 | 137篇 |
1993年 | 122篇 |
1992年 | 209篇 |
1991年 | 195篇 |
1990年 | 231篇 |
1989年 | 218篇 |
1988年 | 190篇 |
1987年 | 204篇 |
1986年 | 182篇 |
1985年 | 229篇 |
1984年 | 166篇 |
1983年 | 159篇 |
1982年 | 147篇 |
1981年 | 135篇 |
1980年 | 139篇 |
1979年 | 202篇 |
1978年 | 159篇 |
1977年 | 136篇 |
1976年 | 105篇 |
1975年 | 100篇 |
1974年 | 109篇 |
1971年 | 98篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
Eisenhauer ER Mosher EC Lamson KS Wolf HA Schwartz DG 《Health information and libraries journal》2012,29(2):152-161
Background: Somali Bantu refugees, with unique health information needs, created challenges for health and social service providers. Objectives: A service innovation was developed (i) to raise awareness, especially among local health and social service providers, about the Bantu refugees’ presence in the community, their culture, and their information needs and (ii) to deliver needed health information, emphasizing child health, to the Bantu mothers in their homes. Methods: The project consisted of: (i) a community conference targeting local health and social service providers, describing the refugees’ presence in the community, their culture, and information needs. (ii) Focus groups conducted with members of the Bantu population elicited additional information needs. (iii) Curriculum was developed based on identified needs, and (iv) the curriculum was delivered to the refugees in their homes. A clinical informationist and MP3 technology enhanced the project. Findings: Conference attendees’ evaluation responses indicated improved understanding of Bantu culture. Focus groups’ identification of health information needs provided a framework for the health education curriculum. A project website made educational materials available to other healthcare providers. Conclusions: The project raised awareness of the Bantus’ presence, culture, and information needs. Identification of other unmet needs demonstrated that additional support for refugees is required. 相似文献
83.
84.
Myers ND Wolfe EW Maier KS Feltz DL Reckase MD 《Research quarterly for exercise and sport》2006,77(4):451-463
This study extended validity evidence for multidimensional measures of coaching competency derived from the Coaching Competency Scale (CCS; Myers, Feltz, Maier, Wolfe, & Reckase, 2006) by examining use of the original rating scale structure and testing how measures related to satisfaction with the head coach within teams and between teams. Motivation, game strategy, technique, and character building comprised the dimensions of coaching competency. Data were collected from athletes (N = 585) nested within intercollegiate men's (g = 8) and women's (g = 13) soccer and women's ice hockey (g = 11) teams (G = 32). Validity concerns were observed for the original rating scale structure and the predicted positive relationship between motivation competency and satisfaction with the coach between teams. Validity evidence was offered for a condensed post hoc rating scale and the predicted relationship between motivation competency and satisfaction with the coach within teams. 相似文献
85.
Efthimiadou A Asimakopoulos B Nikolettos N Giatromanolaki A Sivridis E Lialiaris TS Papachristou DN Kontoleon E 《Journal of sports sciences》2006,24(8):849-854
Although angiogenetic therapy using recombinant growth factors holds much hope for the treatment of ischaemic diseases, there are still many unanswered questions, including the method of administration, the correct dose of these factors, and the duration of the therapeutic approach. Exercise has also been suggested to induce neovascularizaiton in muscles. We evaluated the angiogenetic effects of the intramuscular administration of basic-fibroblast growth factor (b-FGF) and acidic-fibroblast growth factor (a-FGF) in rat heart, compared with rats who exercised daily. In conclusion, both the intramuscular administration of b-FGF and exercise increased significantly angiogenesis in the heart in contrast to the intramuscular administration of a-FGF, which was ineffective. 相似文献
86.
87.
S.G. Tzafestas 《Journal of The Franklin Institute》1980,309(6):399-438
In this paper a variety of optimal control (OC) problems for distributed- parameter (DP) systems are approached using mathematical programming (MP). First, the principal DP models in current use are given, a variety of DP objective functions is provided, and the OC problems based on them are formulated. Second, these models and objective functions are converted in algebraic form, as required by MP, and the solution procedure of the OC problems via MP is outlined. Third, a representative set of nonlinear programming results applied to DP systems is presented, and finally, a numvber of application examples is given. 相似文献
88.
Gérald Séguin 《Journal of The Franklin Institute》1980,309(3):179-189
A sequence of metrics {DN} is said to be additive and matched to a discrete memoryless channel (DMC) if DN is the sum on its coordinates of N single letter metrics and if the maximum likelihood decoder for sequences of length N is a minimum DN-distance decoder. Necessary and sufficient conditions on the transition probabilities of a DMC for the existence of a sequence of additive metrics matched to it are given. In the case of the binary channel these are shown to be equivalent to the channel being symmetric. Explicit transition probabilities are given for a large class of ternary DMCs with an associated sequence of additive matched metrics. The problem solved here may be considered a generalization of the problem of finding the DMCs matched to the Lee metric solved by Chiang and Wolf in 1971 (2). 相似文献
89.
M.O. Ahmad C.H. Reddy V. Ramachandran M.N.S. Swamy 《Journal of The Franklin Institute》1979,307(2):71-81
Necessary and sufficient conditions are obtained for the realization of an m-variable positive real function (PRF) as the impedence function of a resistively-terminated ladder network of m lossless two-ports connected in cascade. Each two-port is a single-variable lossless ladder with all of its transmission zeros either at the origin or at finity. Conditions are also obtained when each of the two-ports is a Fujisawa-type lowpass ladder. 相似文献
90.