全文获取类型
收费全文 | 1313篇 |
免费 | 28篇 |
国内免费 | 2篇 |
专业分类
教育 | 970篇 |
科学研究 | 70篇 |
各国文化 | 20篇 |
体育 | 84篇 |
文化理论 | 14篇 |
信息传播 | 185篇 |
出版年
2022年 | 10篇 |
2021年 | 18篇 |
2020年 | 23篇 |
2019年 | 47篇 |
2018年 | 48篇 |
2017年 | 66篇 |
2016年 | 59篇 |
2015年 | 32篇 |
2014年 | 39篇 |
2013年 | 284篇 |
2012年 | 42篇 |
2011年 | 37篇 |
2010年 | 34篇 |
2009年 | 33篇 |
2008年 | 44篇 |
2007年 | 22篇 |
2006年 | 24篇 |
2005年 | 14篇 |
2004年 | 17篇 |
2003年 | 18篇 |
2002年 | 15篇 |
2001年 | 34篇 |
2000年 | 24篇 |
1999年 | 20篇 |
1998年 | 13篇 |
1997年 | 11篇 |
1995年 | 10篇 |
1994年 | 10篇 |
1993年 | 11篇 |
1992年 | 15篇 |
1991年 | 12篇 |
1990年 | 9篇 |
1989年 | 10篇 |
1987年 | 14篇 |
1986年 | 21篇 |
1985年 | 14篇 |
1984年 | 7篇 |
1983年 | 14篇 |
1982年 | 9篇 |
1980年 | 9篇 |
1979年 | 17篇 |
1978年 | 9篇 |
1976年 | 8篇 |
1975年 | 7篇 |
1974年 | 6篇 |
1973年 | 7篇 |
1972年 | 8篇 |
1970年 | 7篇 |
1969年 | 7篇 |
1966年 | 8篇 |
排序方式: 共有1343条查询结果,搜索用时 15 毫秒
61.
62.
A pipelined architecture for distributed text query evaluation 总被引:1,自引:0,他引:1
Alistair Moffat William Webber Justin Zobel Ricardo Baeza-Yates 《Information Retrieval》2007,10(3):205-231
Two principal query-evaluation methodologies have been described for cluster-based implementation of distributed information
retrieval systems: document partitioning and term partitioning. In a document-partitioned system, each of the processors hosts
a subset of the documents in the collection, and executes every query against its local sub-collection. In a term-partitioned
system, each of the processors hosts a subset of the inverted lists that make up the index of the collection, and serves them
to a central machine as they are required for query evaluation.
In this paper we introduce a pipelined query-evaluation methodology, based on a term-partitioned index, in which partially
evaluated queries are passed amongst the set of processors that host the query terms. This arrangement retains the disk read
benefits of term partitioning, but more effectively shares the computational load. We compare the three methodologies experimentally,
and show that term distribution is inefficient and scales poorly. The new pipelined approach offers efficient memory utilization
and efficient use of disk accesses, but suffers from problems with load balancing between nodes. Until these problems are
resolved, document partitioning remains the preferred method.
Alistair Moffat was supported by the Australian Research Council, the ARC Special Research Center for Perceptive and Intelligent
Machines in Complex Environments, and the NICTA Victoria Laboratory.
William Webber and Justin Zobel were supported by the Australian Research Council.
Ricardo Baeza-Yates was supported by Grant P01-029-F from Millennium Initiative of Mideplan, Chile; and by the University
of Melbourne as a visiting scholar at the time this project was undertaken. 相似文献
63.
64.
65.
66.
67.
The aim of this study was to examine strategies for selecting a criterion value during anthropometric data assembly and their resilience to imposed error. Sixty-seven women aged 16-60 years were subjected to three separate series of measurements, which included six skinfolds and three girths. A random error term was added to the first of the three series of measurements to produce a pseudo-series containing error, termed the 'erroneous replicated series'. Five strategies were then used to determine the criterion value of each of the replication series: the first measurement, the mean of the first two measurements, the mean of all three measurements, the mean of the closest two measurements and the median of the three measurements. The technical error between the criterion values of the true and the flawed replication series for each of the selection strategies was calculated. We found that, for five of the skinfolds and all of the girths, the median value provided the smallest technical error of measurement between the criterion values for the true and erroneous replication series. We conclude that the strategy of selecting the median of three measurements is the most resilient to imposed error. 相似文献
68.
Kirk D. Anderson 《School Effectiveness & School Improvement》2013,24(1):97-113
As part of a comprehensive qualitative study of 6 schools noted for teacher leadership 28 respondents were interviewed. It was noted that teacher leadership often involved the mutual influence between teacher leaders and principals. These influences are discussed from the perspectives of each of the 6 schools and respondent status as teacher leader, teacher nominator, and administrator. Further to these influences, the data suggest relationships between teachers, teacher leaders, and principals, in these schools, which are reflective of 3 models of “leadership reciprocity” based on unique features found to be typical of these schools. 相似文献
69.
70.