全文获取类型
收费全文 | 590篇 |
免费 | 11篇 |
专业分类
教育 | 515篇 |
科学研究 | 21篇 |
各国文化 | 3篇 |
体育 | 28篇 |
文化理论 | 7篇 |
信息传播 | 27篇 |
出版年
2023年 | 6篇 |
2022年 | 8篇 |
2021年 | 16篇 |
2020年 | 29篇 |
2019年 | 32篇 |
2018年 | 33篇 |
2017年 | 38篇 |
2016年 | 34篇 |
2015年 | 25篇 |
2014年 | 29篇 |
2013年 | 128篇 |
2012年 | 28篇 |
2011年 | 23篇 |
2010年 | 10篇 |
2009年 | 20篇 |
2008年 | 13篇 |
2007年 | 16篇 |
2006年 | 9篇 |
2005年 | 9篇 |
2004年 | 11篇 |
2003年 | 5篇 |
2002年 | 6篇 |
2001年 | 2篇 |
2000年 | 6篇 |
1999年 | 3篇 |
1998年 | 4篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 3篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1965年 | 2篇 |
1959年 | 1篇 |
排序方式: 共有601条查询结果,搜索用时 31 毫秒
31.
32.
Salmanzadeh A Kittur H Sano MB C Roberts P Schmelz EM Davalos RV 《Biomicrofluidics》2012,6(2):24104-2410413
Ovarian cancer is the leading cause of death from gynecological malignancies in women. The primary challenge is the detection of the cancer at an early stage, since this drastically increases the survival rate. In this study we investigated the dielectrophoretic responses of progressive stages of mouse ovarian surface epithelial (MOSE) cells, as well as mouse fibroblast and macrophage cell lines, utilizing contactless dielectrophoresis (cDEP). cDEP is a relatively new cell manipulation technique that has addressed some of the challenges of conventional dielectrophoretic methods. To evaluate our microfluidic device performance, we computationally studied the effects of altering various geometrical parameters, such as the size and arrangement of insulating structures, on dielectrophoretic and drag forces. We found that the trapping voltage of MOSE cells increases as the cells progress from a non-tumorigenic, benign cell to a tumorigenic, malignant phenotype. Additionally, all MOSE cells display unique behavior compared to fibroblasts and macrophages, representing normal and inflammatory cells found in the peritoneal fluid. Based on these findings, we predict that cDEP can be utilized for isolation of ovarian cancer cells from peritoneal fluid as an early cancer detection tool. 相似文献
33.
OBJECTIVES: To examine the effects of different forms of family violence at two developmental stages by assessing a sample of 110 Israeli children, drawn from the case files of Israeli family service agencies, studied longitudinally in both middle childhood and adolescence. METHODS: Information about the children's adjustment was obtained from parents, teachers, and the children themselves when the children averaged 10.6 and 15.9 years of age using the Child Behavior Checklist (CBCL), Teacher Report Form (TRF), Youth Self-Report (YSR), and Children's Depression Inventory (CDI). Information about the history of family violence was obtained from the mothers, fathers, children, and social workers. RESULTS: The results paint a mixed picture of the effects of family violence on children and adolescents. The relationship between concurrent behavior problems and abuse group varied by informant and study phase, although they were strongest when children were the informants. Predictions regarding the relationship between early abuse and later adjustment were only partially confirmed. Different informants did not agree about which groups of children were most adversely affected, there was little stability over time in the pattern of reported effects, and children were more likely than other informants to report levels of maladjustment that varied depending on recent or concurrent exposure to family violence. Many families changed their abuse status over time, and children who were new victims at follow-up had the most internalizing problems. Girls were found to be at more risk for internalizing and externalizing behavior problems than boys. CONCLUSIONS: Multiple informants are necessary to evaluate and assess the effects of family violence on children's behavior. Younger children may be more susceptible to the effects of family violence than older children, but problems manifest by some children may not carry over to adolescence. Changes in family and parenting practices, as well as in children's capacity to appraise and cope with family violence may help mitigate the adverse effects of family violence. 相似文献
34.
Here is a book that makes you want to shout, "Finally!"That is the opening sentence of a recent book review that theauthor of this review wrote for the International Journal ofPublic Opinion Research about Campaigning for Hearts and Minds:How Emotional Appeals in Political Ads Work by Ted Brader (2006).The remark refers to the fact that Braders book focuseson an issue that has thus far received very little attentionin the field of communication studies, or, for that matter,in the fields of political science or sociology, namely, themajor role emotions play in explaining collective behavior,social decisions, opinion formation andespecially inthe case at handthe effects of media coverage on opinionformation. Now, in the form of Katrin Dövelingscomprehensive new 相似文献
35.
36.
37.
Eva Brumberger 《Technical Communication Quarterly》2013,22(4):369-395
This article reports the results of a survey of professional writers about the nature and importance of visual communication in their work. The results confirm the suggestions in the field's literature that visual communication is important to workplace practice and that the role of the professional writer has expanded beyond the domain of the verbal. Visual communication responsibilities are complex and varied, but the practitioners surveyed typically engage in substantial amounts of design-related work and value visual communication abilities. The data suggest that visual communication should be a curricular priority in professional writing programs. 相似文献
38.
Pete Goldschmidt Jose Felipe Martinez David Niemi Eva L. Baker 《Educational Assessment》2013,18(3-4):239-266
In this article we examine empirical evidence on the criterion, predictive, transfer, and fairness aspects of validity of a large-scale language arts performance assessment, referred to as the Performance Assignment (PA). We use multilevel models to avoid biased inferences that might result from the naturally nested data. Specifically, we examine the relationships of the assessment with the Stanford Achievement Test, 9th Edition and the California High School Exit Examination. The results indicate that the measures are related, that students demonstrate a degree of transfer, and that the language arts PA is relatively more fair than comparison assessments. The results are robust to various model specifications and demonstrate that benefits do not accrue to all students equally. 相似文献
39.
Eva M. Zygmunt‐Fillwalk 《Journal of Early Childhood Teacher Education》2013,34(2):203-204
Brain Research and Childhood Education: Implications for Educators D. Bergen and J. Coscia; Olney, MD: 2001 Association for Childhood Education International. 80 pp. ISBN 0–87173–154–1 (pbk.) 相似文献
40.
In our article, we explore the possibility of formulating theses about teaching as one way to use research as a basis for educational action. The theses are formulated from current educational research on teaching and learning in higher education. We also explore the potential for action and the consequences derived from the theses. With our theses, we criticise less complex ways of using research for educational purposes. Through theses we can suggest directions for action without prescribing certain methods or procedures and provide answers without reducing the teachers' possibilities for choice or diminishing their responsibility for their actions. Our exploration is an invitation to a collaborative exploration of theses on teaching and learning in order to broaden and deepen our shared basis for educational action. 相似文献