全文获取类型
收费全文 | 54217篇 |
免费 | 4307篇 |
国内免费 | 2046篇 |
学科分类
工业技术 | 60570篇 |
出版年
2024年 | 193篇 |
2023年 | 867篇 |
2022年 | 1446篇 |
2021年 | 2293篇 |
2020年 | 1697篇 |
2019年 | 1455篇 |
2018年 | 1649篇 |
2017年 | 1800篇 |
2016年 | 1611篇 |
2015年 | 2128篇 |
2014年 | 2743篇 |
2013年 | 3194篇 |
2012年 | 3389篇 |
2011年 | 3690篇 |
2010年 | 3252篇 |
2009年 | 2941篇 |
2008年 | 2873篇 |
2007年 | 2801篇 |
2006年 | 2944篇 |
2005年 | 2507篇 |
2004年 | 1582篇 |
2003年 | 1379篇 |
2002年 | 1300篇 |
2001年 | 1023篇 |
2000年 | 1235篇 |
1999年 | 1493篇 |
1998年 | 1195篇 |
1997年 | 1027篇 |
1996年 | 1019篇 |
1995年 | 888篇 |
1994年 | 711篇 |
1993年 | 467篇 |
1992年 | 382篇 |
1991年 | 296篇 |
1990年 | 244篇 |
1989年 | 199篇 |
1988年 | 175篇 |
1987年 | 108篇 |
1986年 | 92篇 |
1985年 | 60篇 |
1984年 | 52篇 |
1983年 | 36篇 |
1982年 | 32篇 |
1981年 | 29篇 |
1980年 | 17篇 |
1979年 | 7篇 |
1978年 | 7篇 |
1977年 | 10篇 |
1976年 | 14篇 |
1975年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 421 毫秒
981.
982.
本文针对网络新闻报道,提出了一种基于文本内容分析的社会网络自动抽取方法。此方法在对输入文章进行分词标注、共指消解等预处理之后,通过名词合并及主动词识别,得到存在关系的命名实体之间的关系指向和关系描述,最后通过有向图把存在关系的命名实体进行连接,形成由命名实体、实体间关系指向、实体间关系描述构成的关系网络。试验结果表明该方法对新闻中的命名实体关系抽取比较有效。 相似文献
983.
中国科学院计算机网络信息中心与青海湖保护区管理局合作,共同建设了青海湖野外网络视频监控。如何高效地处理每天产出的超过 100GB 的视频数据成为了一个难题。现在的视频处理系统采用计算和存储相分离的架构,这需要配置较高的专门服务器进行支撑,本文基于廉价扩展性能较好的 Hadoop 平台对视频处理做出了分布式的实现,并对单个视频文件做出了分布式转码的实现。同时,本文将基于 Hadoop 的分布式视频处理的实现和基于 HTCondor 的分布式视频的批处理实现进行了对比,实验证明,在不损失视频处理效率的条件下,基于 Hadoop 的分布式视频处理的实现拥有分布式文件系统支撑、完善的任务监控等优势。 相似文献
984.
4:1! Google’s artificial intelligence (AI) program, AlphaGo, has won Go Master Lee Sedol in a best-of-five competition held in Korean March 9?15, 2016. Seen by many as a landmark moment for AI, the outcome did not come as a surprise, considering the excellent combination of 1920 CPUs with sophisticated AI algorithms, including neural networks and Monte Carlo tree search (Gibney, 2016; Silver et al., 2016). Indeed, research on distributed computing and artificial intelligence (DCAI) has matured during the last decade and many effective applications are now deployed, performing an increasingly important role in modern computer science, including the two most hyped technologies: Internet of Things and Big Data. Indeed, it is fair to say that the application of artificial intelligence in distributed environments is becoming an essential element of high added value and economic potential. 相似文献
985.
986.
It is common for wind turbines to be installed in remote locations on land or offshore, leading to difficulties in routine inspection and maintenance. Further, wind turbines in these locations are often subject to harsh operating conditions. These challenges mean there is a requirement for a high degree of maintenance. The data generated by monitoring systems can be used to obtain models of wind turbines operating under different conditions, and hence predict output signals based on known inputs. A model-based condition monitoring system can be implemented by comparing output data obtained from operational turbines with those predicted by the models, so as to detect changes that could be due to the presence of faults. This paper discusses several techniques for model-based condition monitoring systems: linear models, artificial neural networks, and state dependent parameter "pseudo" transfer functions. The models are identified using supervisory control and data acquisition (SCADA) data acquired from an operational wind firm. It is found that the multiple-input single-output state dependent parameter method outperforms both multivariate linear and artificial neural network-based approaches. Subsequently, state dependent parameter models are used to develop adaptive thresholds for critical output signals. In order to provide an early warning of a developing fault, it is necessary to interpret the amount by which the threshold is exceeded, together with the period of time over which this occurs. In this regard, a fuzzy logic-based inference system is proposed and demonstrated to be practically feasible. 相似文献
987.
Inter-femtocell interference becomes serious when femtocells are densely deployed. To mitigate the inter-femtocell interference, this paper proposes a cluster-based bandwidth allocation algorithm. We create femtocell clusters by constructing a weighted interference graph and allocate bandwidth to each cluster based on a Nash bargaining solution (NBS). Simulation results show that the cluster-based bandwidth allocation algorithm can reduce the inter-femtocell interference and meet the minimum rate constraint of each cluster. 相似文献
988.
989.
Game‐Based Valley‐Fill Charging Coordination for Large‐Population Plug‐in Electric Vehicles
下载免费PDF全文
![点击此处可从《Asian journal of control》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Charging coordination of large‐population autonomous plug‐in electric vehicles (PEVs) in the power grid can be formulated as a class of constrained optimization problems. To overcome the computational complexity, a game‐based method is proposed for the charging problems of the PEV population, which is composed of homogeneous subpopulations, such that individuals update their best charging strategies simultaneously with respect to a common electricity price determined by the total demand. To mitigate the oscillation behavior caused by the greedy behavior for the cheap electricity by individuals, a deviation cost is introduced to penalize against the deviation of the individual strategy from the average value of the homogeneous subpopulation. By adopting a proper deviation cost and following a best strategy update mechanism, the game systems may converge to the socially optimal valley‐fill Nash equilibrium. Simulation examples are studied to illustrate the results. 相似文献
990.