全文获取类型
收费全文 | 13138篇 |
免费 | 775篇 |
国内免费 | 921篇 |
专业分类
电工技术 | 382篇 |
综合类 | 798篇 |
化学工业 | 1169篇 |
金属工艺 | 371篇 |
机械仪表 | 1435篇 |
建筑科学 | 970篇 |
矿业工程 | 207篇 |
能源动力 | 531篇 |
轻工业 | 260篇 |
水利工程 | 275篇 |
石油天然气 | 352篇 |
武器工业 | 110篇 |
无线电 | 965篇 |
一般工业技术 | 650篇 |
冶金工业 | 318篇 |
原子能技术 | 127篇 |
自动化技术 | 5914篇 |
出版年
2024年 | 25篇 |
2023年 | 117篇 |
2022年 | 179篇 |
2021年 | 280篇 |
2020年 | 223篇 |
2019年 | 246篇 |
2018年 | 237篇 |
2017年 | 297篇 |
2016年 | 385篇 |
2015年 | 412篇 |
2014年 | 763篇 |
2013年 | 729篇 |
2012年 | 724篇 |
2011年 | 1100篇 |
2010年 | 726篇 |
2009年 | 749篇 |
2008年 | 802篇 |
2007年 | 952篇 |
2006年 | 886篇 |
2005年 | 762篇 |
2004年 | 686篇 |
2003年 | 700篇 |
2002年 | 507篇 |
2001年 | 415篇 |
2000年 | 294篇 |
1999年 | 300篇 |
1998年 | 266篇 |
1997年 | 218篇 |
1996年 | 167篇 |
1995年 | 155篇 |
1994年 | 108篇 |
1993年 | 75篇 |
1992年 | 84篇 |
1991年 | 51篇 |
1990年 | 44篇 |
1989年 | 47篇 |
1988年 | 31篇 |
1987年 | 8篇 |
1986年 | 16篇 |
1985年 | 19篇 |
1984年 | 13篇 |
1983年 | 10篇 |
1982年 | 9篇 |
1981年 | 6篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1976年 | 3篇 |
1973年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
21.
22.
Statistical machine translation systems are usually trained on large amounts of bilingual text (used to learn a translation
model), and also large amounts of monolingual text in the target language (used to train a language model). In this article
we explore the use of semi-supervised model adaptation methods for the effective use of monolingual data from the source language
in order to improve translation quality. We propose several algorithms with this aim, and present the strengths and weaknesses
of each one. We present detailed experimental evaluations on the French–English EuroParl data set and on data from the NIST
Chinese–English large-data track. We show a significant improvement in translation quality on both tasks. 相似文献
23.
虚拟企业模型并行仿真研究 总被引:4,自引:0,他引:4
随着各种全新的制造理念,特别是虚拟企业的出现,企业模型的规模不断扩大,使目前存在的大多数企业模型仿真系统的效率大大下降。该文针对此问题,通过深入分析虚拟企业模型结构,并在已有的构件化企业建模体系CEMS及其仿真系统的基础上,结合异步仿真技术和多线程技术提出了一种分层式企业模型仿真体系结构,为虚拟企业模型的快速高效的仿真提供了一种有效的方法。 相似文献
24.
涡轮增压柴油机模拟计算等压法的探讨 总被引:3,自引:0,他引:3
针对有些模拟计算可以忽略排气压力波的影响,提出了等压法计算的设想,这是一种每一工作循环缸外热力过程只计算一次的简化方法。分析结果表明,这种计算可以满足零维模型必须满足的所有制约方程,能真实地模拟涡轮增压柴油机的实际工作过程,适用于各种增压系统,但仍有待于进一步的研究与改进。根据等压法,建立了一种适用于定压涡轮系统的计算模型--“定压涡轮”模型,用于MPC增压系统的计算,计算结果与试验结果基本吻合,与容积法计算结果趋于一致,从而验证了模型的正确性,同时也表明这种缸外计算法是有效的。 相似文献
25.
A model-based autotuning method consists of an identification and a regulator tuning phase. To achieve satisfactory performance and robustness, it is advisable that both phases be tailored a priori to the characteristics of the observed process dynamics. Such characteristics include, but are not limited to, the model structure. For example, overdamped and underdamped models with the same pole-zero structure are parametrised and controlled in different ways. Step response data, that are typically used for the identification phase in the autotuning context, can also be pre-processed to reveal those characteristics. This paper presents a step response classification method suitable for the above purpose. The method is based on a polygonal curve approximation technique for data pre-processing, followed by a neural network classifier. Only normalised I/O data are employed, so that the neural network can be trained off-line with simulated data. Simulation results are reported to show the effectiveness of the proposed classification method in terms of the achievable tuning results. 相似文献
26.
Enrico Tronci 《International Journal on Software Tools for Technology Transfer (STTT)》2006,8(4-5):355-358
In today’s competitive market designing of digital systems (hardware as well as software) faces tremendous challenges. In
fact, notwithstanding an ever decreasing project budget, time to market and product lifetime, designers are faced with an
ever increasing system complexity and customer expected quality. The above situation calls for better and better formal verification
techniques at all steps of the design flow. This special issue is devoted to publishing revised versions of contributions
first presented at the 12th Advanced Research Working Conference on Correct Hardware Design and Verification Methods (CHARME) held 21–24 October 2003 in L’Aquila, Italy. Authors of well regarded papers from CHARME’03 were invited to submit
to this special issue. All papers included here have been suitably extended and have undergone an independent round of reviewing. 相似文献
27.
28.
Gabriele Pannocchia Author Vitae Author Vitae Stephen J. Wright Author Vitae 《Automatica》2007,43(5):852-860
Partial enumeration (PE) is presented as a method for treating large, linear model predictive control applications that are out of reach with available MPC methods. PE uses both a table storage method and online optimization to achieve this goal. Versions of PE are shown to be closed-loop stable. PE is applied to an industrial example with more than 250 states, 32 inputs, and a 25-sample control horizon. The performance is less than 0.01% suboptimal, with average speedup factors in the range of 80-220, and worst-case speedups in the range of 4.9-39.2, compared to an existing MPC method. Small tables with only 25-200 entries were used to obtain this performance, while full enumeration is intractable for this example. 相似文献
29.
本文基于自回归滑动平均(ARMAX)控制模型的简要介绍,利用混合信号ISPFLASH微控制器技术,详细介绍了车辆行驶动态过程的空燃比自校正控制(STC)的硬件结构和软件配置及设计方法。 相似文献
30.
The research literature has seen a number of studies aimed at understanding customer attitudes towards banking technologies, and thereby providing implications for developmental planning and marketing. However, even though banking technologies have a significant amount of information systems (IS) component to them, there is a paucity of research that considers them from the IS perspective. In this paper, we fill this gap by considering three constructs, namely usefulness, ease of use and usage, that are all rooted in the IS literature. We study user’s perceptions of these constructs, as well as the relationships among them, for both online and telephone banking. 相似文献