全文获取类型
收费全文 | 36464篇 |
免费 | 6466篇 |
国内免费 | 5467篇 |
学科分类
工业技术 | 48397篇 |
出版年
2024年 | 875篇 |
2023年 | 2462篇 |
2022年 | 3884篇 |
2021年 | 3758篇 |
2020年 | 3183篇 |
2019年 | 2179篇 |
2018年 | 1559篇 |
2017年 | 1416篇 |
2016年 | 1431篇 |
2015年 | 1491篇 |
2014年 | 2305篇 |
2013年 | 1771篇 |
2012年 | 2144篇 |
2011年 | 2361篇 |
2010年 | 1983篇 |
2009年 | 1912篇 |
2008年 | 1785篇 |
2007年 | 1815篇 |
2006年 | 1633篇 |
2005年 | 1462篇 |
2004年 | 1091篇 |
2003年 | 962篇 |
2002年 | 848篇 |
2001年 | 648篇 |
2000年 | 611篇 |
1999年 | 490篇 |
1998年 | 410篇 |
1997年 | 332篇 |
1996年 | 281篇 |
1995年 | 203篇 |
1994年 | 172篇 |
1993年 | 148篇 |
1992年 | 118篇 |
1991年 | 62篇 |
1990年 | 64篇 |
1989年 | 64篇 |
1988年 | 36篇 |
1987年 | 31篇 |
1986年 | 48篇 |
1984年 | 14篇 |
1979年 | 16篇 |
1966年 | 14篇 |
1965年 | 24篇 |
1964年 | 25篇 |
1963年 | 23篇 |
1961年 | 17篇 |
1959年 | 18篇 |
1958年 | 16篇 |
1957年 | 22篇 |
1955年 | 23篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
钻杆防磨技术的现状和发展 总被引:3,自引:3,他引:0
在深井超深井勘探过程中,由于径向力、涡动、横向振动等因素的存在,随着钻井时间的增长,钻柱作用于套管内壁的侧向力增大,导致套管磨损的问题越来越严重。介绍了近年来钻杆防磨技术的发展,主要从钻杆接头表面处理和钻杆保护器2方面来研究防磨减磨措施的现状和发展。 相似文献
42.
43.
In this paper, we propose an approach that combines the unsupervised and supervised learning techniques for unconstrained
handwritten numeral recognition. This approach uses the Kohonen self-organizing neural network for data classification in
the first stage and the learning vector quantization (LVQ) model in the second stage to improve classification accuracy. The
combined architecture performs better than the Kohonen self-organizing map alone. In the proposed approach, the collection
of centroids at different phases of training plays a vital role in the performance of the recognition system. Four experiments
have been conducted and experimental results show that the collection of centroids in the middle of the training gives high
performance in terms of speed and accuracy. The systems developed also resolve the confusion between handwritten numerals. 相似文献
44.
45.
We discuss algorithms for learning and revising user profiles that can determine which World Wide Web sites on a given topic would be interesting to a user. We describe the use of a naive Bayesian classifier for this task, and demonstrate that it can incrementally learn profiles from user feedback on the interestingness of Web sites. Furthermore, the Bayesian classifier may easily be extended to revise user provided profiles. In an experimental evaluation we compare the Bayesian classifier to computationally more intensive alternatives, and show that it performs at least as well as these approaches throughout a range of different domains. In addition, we empirically analyze the effects of providing the classifier with background knowledge in form of user defined profiles and examine the use of lexical knowledge for feature selection. We find that both approaches can substantially increase the prediction accuracy. 相似文献
46.
This paper describes how SWoRD (scaffolded writing and rewriting in the discipline), a web-based reciprocal peer review system, supports writing practice, particularly for large content courses in which writing is considered critical but not feasibly included. To help students gain content knowledge as well as writing and reviewing skills, SWoRD supports the whole cycle of writing, reviews, back-reviews, and rewriting by scaffolding the journal publication process as its authentic practice model. In addition, SWoRD includes algorithms that compute individual reviewer’s review accuracy, which is in turn used to support the various drawbacks of reciprocal peer reviews (e.g., variation in motivation or ability of reviewers). Finally, this paper describes an empirical evaluation showing that the SWoRD approach is effective in improving writing quality in content classes. 相似文献
47.
深基坑施工安全的监测与实例 总被引:1,自引:0,他引:1
从明确深基坑施工安全监测的关键出发,确定了监测内容和相关极限报警值,用工程实例进行了阐述。 相似文献
48.
Improved Estimates for the Accuracy of Small Disjuncts 总被引:2,自引:0,他引:2
Learning systems often describe a target class as a disjunction of conjunctions of conditions. Recent work has noted that small disjuncts, i.e., those supported by few training examples, typically have poor predictive accuracy. One model of this accuracy is provided by the Bayes-Laplace formula based on the number of training examples covered by the disjunct and the number of them belonging to the target class. However, experiments show that small disjuncts associated with target classes of different relative frequencies tend to have different error rates. This note defines the context of a disjunct as the set of training examples that fail to satisfy at most one of its conditions. An empirical adaptation of the Bayes-Laplace formula is presented that also makes use of the relative frequency of the target class in this context. Trials are reported comparing the performance of the original formula and the adaptation in six learning tasks. 相似文献
49.
The purpose of the present study was to gain a deeper understanding of the role of the basal ganglia in learning and memory by examining learning strategies among patients with basal ganglia dysfunction. Using a probabilistic category learning task (the "weather prediction" task) previously shown to be sensitive to basal ganglia function, the authors examined patterns of performance during learning and used mathematical models to capture different learning strategies. Results showed that patients with Parkinson's disease exhibit different patterns of strategy use. Specifically, most controls initially used a simple, but suboptimal, strategy that focused on single-cue-outcome associations; eventually, however, most controls adopted a more complex, optimal learning strategy, integrating single-cue associations to predict outcomes for multiple-cue stimuli. In contrast, the majority of individuals with Parkinson's disease continued to rely on simple single-cue learning strategies throughout the experiment. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
50.
No authorship indicated 《Canadian Metallurgical Quarterly》2006,61(8):811
Presents the citation for Anthony D. Wagner, who received the Award for Distinguished Scientific Early Career Contributions to Psychology (cognition and human learning) "for outstanding and innovative research on the neural basis of memory and executive control." A brief profile and a selected bibliography accompany the citation. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献