全文获取类型
收费全文 | 449篇 |
免费 | 1篇 |
国内免费 | 1篇 |
专业分类
教育 | 319篇 |
科学研究 | 13篇 |
体育 | 2篇 |
信息传播 | 117篇 |
出版年
2013年 | 17篇 |
2010年 | 3篇 |
2009年 | 7篇 |
2008年 | 7篇 |
2007年 | 6篇 |
2006年 | 9篇 |
2004年 | 3篇 |
2003年 | 9篇 |
1999年 | 5篇 |
1998年 | 6篇 |
1997年 | 8篇 |
1996年 | 12篇 |
1995年 | 11篇 |
1994年 | 8篇 |
1993年 | 12篇 |
1992年 | 13篇 |
1991年 | 21篇 |
1990年 | 17篇 |
1989年 | 13篇 |
1988年 | 12篇 |
1987年 | 13篇 |
1986年 | 18篇 |
1985年 | 12篇 |
1984年 | 23篇 |
1983年 | 16篇 |
1982年 | 14篇 |
1981年 | 12篇 |
1980年 | 12篇 |
1979年 | 3篇 |
1978年 | 7篇 |
1977年 | 9篇 |
1976年 | 10篇 |
1975年 | 11篇 |
1973年 | 7篇 |
1972年 | 11篇 |
1971年 | 6篇 |
1970年 | 5篇 |
1969年 | 3篇 |
1968年 | 2篇 |
1967年 | 5篇 |
1965年 | 3篇 |
1964年 | 3篇 |
1963年 | 2篇 |
1962年 | 4篇 |
1961年 | 2篇 |
1960年 | 3篇 |
1959年 | 4篇 |
1958年 | 5篇 |
1957年 | 4篇 |
1954年 | 6篇 |
排序方式: 共有451条查询结果,搜索用时 62 毫秒
81.
Impact of National Aquarium in Baltimore on Visitors' Conservation Attitudes,Behavior, and Knowledge
This study at the National Aquarium in Baltimore (NAIB) was conducted to assess four key aspects of the visitor experience: (1) incoming conservation knowledge, attitudes, and behavior of NAIB visitors; (2) patterns of use and interaction with exhibition components throughout the NAIB; (3) exiting conservation knowledge, attitudes, and behaviors of visitors; and (4) over time, how the NAIB experience altered or affected individuals' conservation knowledge, attitudes, and behaviors. Three hundred six visitors participated in the study, which was conducted from March through July, 1999. The study utilized four data‐collection techniques: (1) face‐to‐face interviews, (2) Personal Meaning Mapping (PMM), (3) tracking, and (4) follow‐up telephone interviews. Participants were a self‐selected population and were generally more knowledgeable about, more concerned about, and more involved in conservation‐related issues than the general public. However, they were far from conservationists. Visitors in this study clearly absorbed the fundamental conservation message at the NAIB. In fact, the NAIB visit appeared to focus visitors' conservation‐related thoughts, while also broadening their understanding of conservation. Changes in visitors' conservation knowledge, understanding, and interests by and large persisted over six to eight weeks after visiting NAIB. The NAIB experience also connected to visitors' lives in a variety of ways following their visit. However, these personal experiences rarely resulted in new conservation actions. In fact, their enthusiasm and emotional commitment to conservation (inspired during the NAIB visit) generally fell back to original levels, presumably in the absence of reinforcing experiences. The findings of this study are guiding subsequent investigations at the NAIB. More generally, the results suggest strategies to enhance current understanding of the impact free‐choice learning institutions have on their visiting public. 相似文献
82.
83.
The individual members of 35 UK learned societies were surveyed on their attitudes to open access (OA); 1,368 responses were received. Most respondents said they knew what OA was, and supported the idea of OA journals. However, although 60% said that they read OA journals and 25% that they published in them, in both cases around one‐third of the journals named were not OA. While many were in favour of increased access through OA journals, concerns were expressed about the cost to authors, possible reduction in quality, and negative impact on existing journals, publishers, and societies. By contrast, less than half knew what self‐archiving was; 36% thought it was a good idea and 50% were unsure. Just under half said they used repositories of self‐archived articles, but 13% of references were not in fact to self‐archiving repositories. 29% said they self‐archived their own articles, but 10% of references were not to publicly accessible sites of any kind. The access and convenience of self‐archiving repositories were seen as positive, but there were concerns about quality control, workload for authors and institutions, chaotic proliferation of versions, and potential damage to existing journals, publishers, and societies. 相似文献
84.
85.
JOHN CRIBBIN 《European Journal of Education》2009,44(1):53-64
Hong Kong Government policy is to promote Hong Kong as an international education hub for the region. This may be more rhetoric than reality. The article surveys the historical background of Hong Kong in terms of its role as a trading centre, a gateway to China and a meeting place for East and West for which interchange with European languages and cultures has been important. The development of education policy within Hong Kong as far as the European dimension is involved is also reviewed. In addition, the development of global trade in educational services is touched upon which thus far has been heavily Anglo-centric. In terms of Hong Kong itself, an analysis is presented of overseas educational programmes available in Hong Kong from Europe. The extent of European languages and studies provided in the school, university and lifelong learning sectors is surveyed. The work of European consulates in promoting languages and culture through such organisations as the Alliance Française, Goethe Instituta, etc. is another important part of provision. The article makes passing reference to the neighbouring territory of Macau and the importance there of Portuguese.
The article concludes that for European studies and languages, the role of Hong Kong as a trading and financial hub has been a more significant stimulant than the Hong Kong government's policy for Hong Kong to be an international education hub. 相似文献
The article concludes that for European studies and languages, the role of Hong Kong as a trading and financial hub has been a more significant stimulant than the Hong Kong government's policy for Hong Kong to be an international education hub. 相似文献
86.
87.
W.H. ADRIAAN HOFMAN ROELANDE H. HOFMAN & JOHN M. GRAY 《European Journal of Education》2010,45(1):153-173
15 European countries were classified into four types in an international comparative study. The country profiles are based on indicators of the key concepts' funding, governance and choice. This research attempts to answer the question of how the quality of schooling of these types of education systems progressed as from 1995 and what explanations an expert panel of educationalists and researchers can provide for the outcomes. We observe significant differences between the performance trends of the four types of education systems. Also, comparisons between the different years show relatively high and significant correlations, especially between the original sample of countries in 1995 and future performances in TIMSS and PISA measurements. 相似文献
88.
JOHN MORRIS MARY NEVILL DYLAN THOMPSON JASON COLLIE CLYDE WILLIAMS 《Journal of sports sciences》2013,31(5):371-381
Nine male student games players consumed either flavoured water (0.1 g carbohydrate, Na+ 6 mmol · l?1), a solution containing 6.5% carbohydrate-electrolytes (6.5 g carbohydrate, Na+ 21 mmol · l?1) or a taste placebo (Na+ 2 mmol · l?1) during an intermittent shuttle test performed on three separate occasions at an ambient temperature of 30°C (dry bulb). The test involved five 15-min sets of repeated cycles of walking and variable speed running, each separated by a 4-min rest (part A of the test), followed by 60 s run/60 s rest until exhaustion (part B of the test). The participants drank 6.5 ml · kg?1 of fluid as a bolus just before exercise and thereafter 4.5 ml · kg?1 during every exercise set and rest period (19 min). There was a trial order effect. The total distance completed by the participants was greater in trial 3 (8441 ± 873 m) than in trial 1 (6839 ± 512, P < 0.05). This represented a 19% improvement in exercise capacity. However, the trials were performed in a random counterbalanced order and the participants completed 8634 ± 653 m, 7786 ± 741 m and 7099 ± 647 m in the flavoured water (FW), placebo (P) and carbohydrate-electrolyte (CE) trials, respectively (P = 0.08). Sprint performance was not different between the trials but was impaired over time (FW vs P vs CE: set 1, 2.41 ± 0.02 vs 2.39 ± 0.03 vs 2.39 ± 0.03 s; end set, 2.46 ± 0.03 vs 2.47 ± 0.03 vs 2.47 ± 0.02 s; main effect time, P < 0.01). The rate of rise in rectal temperature was greater in the carbohydrate-electrolyte trial (rise in rectal temperature/duration of trial, °C · h?1; FW vs CE, P < 0.05; P vs CE, N.S.). Blood glucose concentrations were higher in the carbohydrate-electrolyte than in the other two trials (FW vs P vs CE: rest, 4.4 ± 0.1 vs 4.3 ± 0.1 vs 4.2 ± 0.1 mmol · l?1; end of exercise, 5.4 ± 0.3 vs 6.4 ± 0.6 vs 7.2 ± 0.5 mmol · l?1; main effect trial, P < 0.05; main effect time, P < 0.01). Plasma free fatty acid concentrations at the end of exercise were lower in the carbohydrate-electrolyte trial than in the other two trials (FW vs P vs CE: 0.57 ± 0.08 vs 0.53 ± 0.11 vs 0.29 ± 0.04 mmol · l?1; interaction, P < 0.01). The correlation between the rate of rise in rectal temperature (°C · h?1) and the distance completed was ?0.91, ?0.92 and ?0.96 in the flavoured water, placebo and carbohydrate-electrolyte conditions, respectively (P < 0.01). Heart rate, blood pressure, plasma ammonia, blood lactate, plasma volume and rate of perceived exertion were not different between the three fluid trials. Although drinking the carbohydrate-electrolyte solution induced greater metabolic changes than the flavoured water and placebo solutions, it is unlikely that in these unacclimated males carbohydrate availability was a limiting factor in the performance of intermittent running in hot environmental conditions. 相似文献
89.
90.
Studies of collegiate success and attrition are generally conducted at the all-college level. The definition of academic programs that are homogeneous in the abilities and interests of their students and the grading standards of their faculties may lead to more accurate prediction of success and more effective control of attrition.
Homogeneous curricular groups were defined via Ward's hierarchical grouping analysis applied to curricular means on high school percentile rank, four ACT subscores, first semester GPA, and 16 Kuder scores. Programs so defined differed on scientific-verbal and competitive level dimensions. Prediction of grades was more accurate within programs than colleges. Drop and transfer rates were correlated with discriminant scores.
The programs are discussed as promising units within which differential selection and placement strategies might reduce attrition. 相似文献
Homogeneous curricular groups were defined via Ward's hierarchical grouping analysis applied to curricular means on high school percentile rank, four ACT subscores, first semester GPA, and 16 Kuder scores. Programs so defined differed on scientific-verbal and competitive level dimensions. Prediction of grades was more accurate within programs than colleges. Drop and transfer rates were correlated with discriminant scores.
The programs are discussed as promising units within which differential selection and placement strategies might reduce attrition. 相似文献