全文获取类型
收费全文 | 230篇 |
免费 | 8篇 |
国内免费 | 12篇 |
专业分类
电工技术 | 3篇 |
综合类 | 9篇 |
化学工业 | 1篇 |
金属工艺 | 2篇 |
机械仪表 | 3篇 |
建筑科学 | 4篇 |
水利工程 | 1篇 |
无线电 | 28篇 |
一般工业技术 | 10篇 |
冶金工业 | 3篇 |
自动化技术 | 186篇 |
出版年
2023年 | 1篇 |
2022年 | 4篇 |
2021年 | 7篇 |
2020年 | 7篇 |
2019年 | 5篇 |
2018年 | 2篇 |
2017年 | 11篇 |
2016年 | 5篇 |
2015年 | 8篇 |
2014年 | 19篇 |
2013年 | 12篇 |
2012年 | 5篇 |
2011年 | 23篇 |
2010年 | 13篇 |
2009年 | 13篇 |
2008年 | 22篇 |
2007年 | 17篇 |
2006年 | 19篇 |
2005年 | 9篇 |
2004年 | 6篇 |
2003年 | 10篇 |
2002年 | 3篇 |
2001年 | 5篇 |
2000年 | 4篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1990年 | 2篇 |
1986年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有250条查询结果,搜索用时 74 毫秒
1.
Abstract— The yield criterion is interpreted as defining the metric of the stress space. Hydrostatic stresses correspond to null geodesies. The plastic strain increment represents a normal projection of the increment undergone by a certain scalar function (hardening function) which depends only on the distance between stress points. This establishes a flow rule formally equivalent to the Prandtl-Reuss equations. Consideration of un-loading processes leads to the analysis of equivalent paths and to the definition of a generalized length or separation which provides a new representation of kinematic hardening. 相似文献
2.
L. K. Isaev 《Measurement Techniques》2007,50(11):1214-1217
The main prerequisites are considered in a historical aspect and steps ate taken in creating a world-wide metrology system
with the aim of providing conditions for the mutual recognition of measurement results.
__________
Translated from Izmeritel’naya Tekhnika, No. 11. pp. 59–62, November, 2007. 相似文献
3.
4.
解集的均匀性评价是多目标进化算法中性能评价的要素之一.文中结合面向个体和面向空间的思想,提出可变影响空间的概念,并基于此提出一种解集均匀性评价方法——基于可变影响空间的多目标进化算法的解集均匀性评价方法(VISUM).该方法通过分析个体在可变影响空间内的相对均匀程度,能准确反映解集的分布均匀性.实验结果证明文中方法的可行性和有效性. 相似文献
5.
The statistical properties of the autoregressive (AR) distance between ARIMA processes are investigated. In particular, the asymptotic distribution of the squared AR distance and an approximation which is computationally efficient are derived. Moreover, the problem of time series clustering and classification is discussed and the performance of the AR distance is illustrated by means of some empirical applications. 相似文献
6.
On the Competitive Ratio for Online Facility Location 总被引:2,自引:0,他引:2
Dimitris Fotakis 《Algorithmica》2008,50(1):1-57
We consider the problem of Online Facility Location, where the demand points arrive online and must be assigned irrevocably
to an open facility upon arrival. The objective is to minimize the sum of facility and assignment costs. We prove that the
competitive ratio for Online Facility Location is Θ
. On the negative side, we show that no randomized algorithm can achieve a competitive ratio better than Ω
against an oblivious adversary even if the demands lie on a line segment. On the positive side, we present a deterministic
algorithm which achieves a competitive ratio of
in every metric space.
A preliminary version of this work appeared in the Proceedings of the 30th International Colloquium on Automata, Languages
and Programming (ICALP 2003), Lecture Notes in Computer Science 2719. This work was done while the author was at the Max-Planck-Institut
für Informatik, Saarbrücken, Germany, and was partially supported by the Future and Emerging Technologies programme of the
EU under contract number IST-1999-14186 (ALCOM–FT). 相似文献
7.
8.
Carlos Ricolfe-Viala Author Vitae Antonio-José Sánchez-Salmerón Author Vitae 《Pattern recognition》2010,43(4):1688-1699
Camera lens distortion is crucial to obtain the best performance cameral model. Up to now, different techniques exist, which try to minimize the calibration error using different lens distortion models or computing them in different ways. Some compute lens distortion camera parameters in the camera calibration process together with the intrinsic and extrinsic ones. Others isolate the lens distortion calibration without using any template and basing the calibration on the deformation in the image of some features of the objects in the scene, like straight lines or circles. These lens distortion techniques which do not use any calibration template can be unstable if a complete camera lens distortion model is computed. They are named non-metric calibration or self-calibration methods.Traditionally a camera has been always best calibrated if metric calibration is done instead of self-calibration. This paper proposes a metric calibration technique which computes the camera lens distortion isolated from the camera calibration process under stable conditions, independently of the computed lens distortion model or the number of parameters. To make it easier to resolve, this metric technique uses the same calibration template that will be used afterwards for the calibration process. Therefore, the best performance of the camera lens distortion calibration process is achieved, which is transferred directly to the camera calibration process. 相似文献
9.
对测试用例的可复用性度量进行研究,构建测试用例可复用性评估模型,通过分析转化得到易于度量的层次分析模型。通过层次分析模型构建权重比较矩阵,再进行相关属性的度量,并可进一步开展自动的测试用例可复用性度量。 相似文献
10.
Let G be an unweighted connected graph on n vertices. We show that an embedding of the shortest path metric of G into the line with minimum distortion can be found in time 5n+o(n). This is the first algorithm breaking the trivial n!-barrier. 相似文献