全文获取类型
收费全文 | 1220篇 |
免费 | 15篇 |
专业分类
教育 | 990篇 |
科学研究 | 75篇 |
各国文化 | 11篇 |
体育 | 38篇 |
文化理论 | 13篇 |
信息传播 | 108篇 |
出版年
2022年 | 8篇 |
2021年 | 14篇 |
2020年 | 11篇 |
2019年 | 20篇 |
2018年 | 29篇 |
2017年 | 26篇 |
2016年 | 30篇 |
2015年 | 13篇 |
2014年 | 20篇 |
2013年 | 305篇 |
2012年 | 18篇 |
2011年 | 21篇 |
2010年 | 19篇 |
2009年 | 23篇 |
2008年 | 26篇 |
2007年 | 28篇 |
2006年 | 20篇 |
2005年 | 22篇 |
2004年 | 26篇 |
2003年 | 21篇 |
2002年 | 39篇 |
2001年 | 25篇 |
2000年 | 21篇 |
1999年 | 22篇 |
1998年 | 12篇 |
1997年 | 20篇 |
1996年 | 15篇 |
1995年 | 17篇 |
1994年 | 18篇 |
1993年 | 14篇 |
1992年 | 14篇 |
1991年 | 14篇 |
1990年 | 18篇 |
1989年 | 20篇 |
1988年 | 16篇 |
1987年 | 14篇 |
1986年 | 9篇 |
1985年 | 11篇 |
1984年 | 15篇 |
1983年 | 10篇 |
1982年 | 18篇 |
1981年 | 10篇 |
1980年 | 16篇 |
1979年 | 14篇 |
1978年 | 10篇 |
1977年 | 11篇 |
1976年 | 15篇 |
1975年 | 8篇 |
1968年 | 7篇 |
1967年 | 8篇 |
排序方式: 共有1235条查询结果,搜索用时 15 毫秒
51.
The logic and substance of discourse between university supervisors and student teachers during post-observation supervisory conferences were studied in an elementary student teaching program in the United States. The findings describe these aspects of the discourse in relation to the program's goals and (a) the conceptual levels of supervisors and student teachers, (b) the content area of the lesson under analysis, and (c) the structure of the supervisor's role. Implications of the findings for research, program development, and for the preparation and training of supervisors are discussed. 相似文献
52.
53.
AbstractThis article develops a conceptual model of users’ and designers’ knowledge roles in the information and communication technology design process. The “ideal” center at the intersection of the axes for division of knowledge work and privileging of knowledges represents a balanced distribution of knowledge work between users and designers and an avoidance of privileging either group over the other. The article then applies this model to analyses of the design process for six video games wherein the knowledges of Indigenous peoples in North America were mobilized. It concludes by discussing implications for research and design practice, particularly for broadening the participation and self-articulation of marginalized groups. 相似文献
54.
Kenneth P. KodamaAuthor Vitae 《Journal of The Franklin Institute》2002,339(3):315-320
The Franklin Institute, Philadelphia, Pennsylvania, awarded the 2001 Benjamin Franklin Medal in Earth Science to Rob Van der Voo for his outstanding contributions to the field of paleomagnetism and his reconstruction of ancient continental positions that have lead to a better understanding of plate tectonic processes for the past billion years of Earth history. 相似文献
55.
Environment and Policy Factors Shaping Global E-Commerce Diffusion: A Cross-Country Comparison 总被引:1,自引:0,他引:1
This article examines the key global, environmental and policy factors that act as determinants of e-commerce diffusion. It is based on systematic comparison of case studies from 10 countries--Brazil, China, Denmark, France, Germany, Mexico, Japan, Singapore, Taiwan, and the United States. It finds that B2B e-commerce seems to be driven by global forces, whereas B2C seems to be more of a local phenomenon. A preliminary explanation for this difference is that B2B is driven by global competition and MNCs that "push" e-commerce to their global suppliers, customers, and subsidiaries. This in turn creates pressures on local companies to adopt e-commerce to stay competitive. In contrast, B2C is "pulled" by consumer markets, which are mainly local and therefore divergent. While all consumers desire convenience and low prices, consumer preferences and values, national culture, and distribution systems differ markedly across countries and define differences in local consumer markets. These findings support the transformation perspective about globalization and its impacts. In terms of policy, the case studies suggest that enabling policies such as trade and telecommunications liberalization are likely to have the biggest impact on e-commerce, by making ICT and Internet access more affordable to firms and consumers, and increasing pressure on firms to adopt e-commerce to compete. Specific e-commerce legislation appears not to have as big an impact, although inadequate protection for both buyers and sellers in some countries suggests that mechanisms need to be developed to ensure greater confidence in doing business online. 相似文献
56.
Haubert LM Way D DePhilip R Tam M Bishop J Jones K Moffatt-Bruce SD 《Anatomical sciences education》2011,4(4):182-189
Despite extensive experience teaching residents, surgeons are an untapped resource for educating medical students. We hypothesized that by involving surgeons as teachers earlier in the medical school curriculum, medical students' interest in surgery will increase and their opinions of surgeons will improve. Five programs designed to involve surgeons as educators in the medical school curriculum were implemented. The first program, started in 2008, introduced surgical faculty into the first-year medical student anatomy dissection laboratories. Other programs initiated in 2008 included: Surgical Clinical Correlates in Anatomy, which involved faculty teaching through cadaver surgery; Clinical Pathologic Conferences in Anatomy, a surgeon-led conference based on clinical cases; and a women's faculty-student mentorship program. Table Rounds, a surgeon-led anatomy review that used clinical scenarios to quiz students was begun in 2009. All five programs were successfully integrated into the medical school curriculum. While student opinion of surgeons as educators improved, there were no significant changes in student interest in surgery as a career nor change in performance on written examinations over the Anatomy content covered by the surgeons. Surgical faculty and trainees can be integrated into the medical school curriculum. Involving surgeons as educators earlier in the medical school curriculum may have longer term effects than could be observed in this study. At a minimum, the experience improved student opinion of surgeons as educators. 相似文献
57.
58.
Kenneth J. Leising Jared Wong Chad M. Ruprecht Aaron P. Blaisdell 《Learning & behavior》2014,42(4):357-364
Many studies investigating cue competition have focused on the blocking effect. We investigated the blocking effect with pigeons using a landmark-based spatial search task in both a touchscreen preparation (Exp. 1a) and an automated remote environmental navigation apparatus (Exp. 1b). In Phase 1, two landmarks (LMs: A and Z) appeared on separate trials as colored circles among a row of eight (touchscreen) or six (ARENA) identical response units. Subjects were rewarded for pecking at a target response unit to the right of LM A and to the left of an extraneous LM, Z. During the blocking trials in Phase 2, LM X was presented in compound with a second LM (A) that had been previously trained. On control trials, LM Y was presented in compound with LM B and a target in the same manner as in the trials of AX, except that neither landmark had previously been trained with the target. All subjects were then tested with separate trials of A, X, B, and Y. Testing revealed poor spatial control by X relative to A and Y. We report the first evidence for a spatial-blocking effect in pigeons and additional support for associative effects (e.g., blocking) occurring under similar conditions (e.g., training sessions, spatial relationships, etc.) in 3-D and 2-D search tasks. 相似文献
59.
A method is described for determining multiple loop feedback topologies which yield minimum sensitivities for symmetrical, all-pole bandpass filters. The procedure begins with a follow-the-leader feedback (FLF) topology and additional feedback loops are constructed until minimum sensitivity is achieved. Filters comprised of identical second-order sections and non-identical sections, respectively, are considered. 相似文献
60.
Abstract A study was made of the relationship of physique and developmental level, determined by use of the Wetzel Grid, to performance of junior high boys on four fitness tests: pull-ups, 50-yd. dash, standing broad jump, and softball throw. Subjects of different physique groups (heavy, medium, and thin) who were alike developmentally (accelerated, normal, and retarded) differed more markedly in performance than did subjects of different developmental levels who were alike with regard to physique. Subjects who were medium in physique and normal in development were the best performers. Subjects of heavy physique (many overweight) were the poorest performers. This would seem to indicate the need for a restudy of classification methods, particularly when norms are to be used for evaluating performance. 相似文献