全文获取类型
| 收费全文 | 152篇 |
| 免费 | 11篇 |
| 国内免费 | 8篇 |
专业分类
| 电工技术 | 2篇 |
| 综合类 | 8篇 |
| 化学工业 | 4篇 |
| 金属工艺 | 15篇 |
| 机械仪表 | 32篇 |
| 建筑科学 | 4篇 |
| 矿业工程 | 4篇 |
| 能源动力 | 2篇 |
| 武器工业 | 2篇 |
| 无线电 | 18篇 |
| 一般工业技术 | 8篇 |
| 冶金工业 | 1篇 |
| 自动化技术 | 71篇 |
出版年
| 2023年 | 2篇 |
| 2022年 | 2篇 |
| 2020年 | 1篇 |
| 2019年 | 1篇 |
| 2018年 | 2篇 |
| 2017年 | 2篇 |
| 2016年 | 3篇 |
| 2015年 | 3篇 |
| 2014年 | 10篇 |
| 2013年 | 8篇 |
| 2012年 | 6篇 |
| 2011年 | 12篇 |
| 2010年 | 12篇 |
| 2009年 | 10篇 |
| 2008年 | 5篇 |
| 2007年 | 14篇 |
| 2006年 | 15篇 |
| 2005年 | 15篇 |
| 2004年 | 12篇 |
| 2003年 | 9篇 |
| 2002年 | 6篇 |
| 2001年 | 5篇 |
| 2000年 | 3篇 |
| 1999年 | 4篇 |
| 1998年 | 1篇 |
| 1997年 | 4篇 |
| 1996年 | 2篇 |
| 1988年 | 1篇 |
| 1982年 | 1篇 |
排序方式： 共有171条查询结果，搜索用时 0 毫秒
71.
探讨了内槽轮和椭圆齿轮串联时各参数变化对槽轮力学性能的影响以及在现实生产应用中各参数的选择方法,并给出了一个相应的优化实例. 相似文献
72.
基于钛及钛合金的特性,对连轧采用微张力轧制生产钛及钛合金线材过程中所容易出现的成品外形问题进行了分析和论述,并结合其他企业在类似问题中所采取的措施,根据本公司自身情况提出解决办法。 相似文献
73.
通过数码摄像机绕拍摄植物根系一周得到多幅二维图像,定量分析植物根系的三维构型.通过拍摄所得的三维图像,利用图像分割算法和骨架抽取算法,提取根系细化后的拓扑结构,然后根据广义哈夫变换,计算出根系各点旋转所得的椭圆的相关参数,再利用椭圆的右端点,计算得到根系在不同介质层和介质方向的分布情况,并在此基础上,提出一种改进的方法快速确定椭圆参数空间,大幅提升椭圆检测的速度,使得根系的三维构型定量分析可以真正应用于农业领域研究中,为农学家进一步研究植物根系及植物间作套种提供技术支撑. 相似文献
74.
75.
针对内多边形加工问题,通过深入研究椭圆加工轨迹数学模型,探讨了利用椭圆曲线实现旋摆加工的基本思想。在此基础上构建了内多边形加工工艺系统。实际切削操作表明:工艺系统调整简单,易于控制;大大地提高了加工效率,同时降低了加工成本。 相似文献
76.
针对目前纯机械陶瓷滚压成型机存在的弊端,研制了经济型数控滚压成型机,对旋转刀具控制脉冲的输出规律进行研究,探讨了如何与步进电机步距角相匹配的问题。 相似文献
77.
Hydrodynamics characteristics like flow pattern, shear rate distribution, power consumption, axial pumping capacity, mixing time, and mixing efficiency of an ellipse gate (EG) impeller were investigated by experimental and numerical methods. The numerical simulation results were validated by experimental data of power consumption and mixing time. Results indicate that the axial pumping number of the EG impeller is larger than that of any other reported large‐scale impeller under laminar regime, and that the shear rate formed by this impeller is less sensitive to Reynolds numbers. In‐depth analysis reveals the different function of each part of the EG impeller under different flow regimes. This impeller provides an almost similar mixing efficiency like the double‐helical ribbon impeller under laminar regime, but much higher mixing efficiency both under transitional and turbulent flow regimes. 相似文献
78.
We propose a novel and algorithmically simple Hough transform method that exploits the geometric properties of ellipses to enable the robust determination of the ellipse position and properties. We make use of the unique features of the evolute created by Hough voting along the gradient vectors of a two‐dimensional image to determine the ellipse centre, orientation and aspect ratio. A second one‐dimensional voting is performed on the minor axis to uniquely determine the ellipse size. This reduction of search space substantially simplifies the algorithmic complexity. To demonstrate the accuracy of our method, we present analysis of single and multiple ellipsoidal particles, including polydisperse and imperfect ellipsoids, in both simulated images and electron micrographs. Given its mathematical simplicity, ease of implementation and reasonable algorithmic completion time, we anticipate that the proposed method will be broadly useful for image processing of ellipsoidal particles, including their detection and tracking for studies of colloidal suspensions, and for applications to drug delivery and microrheology. 相似文献
79.
活塞中凸形线和椭圆曲线光学测量方法的研究 总被引：2，自引：0，他引：2
分析了目前国内外对活塞测量的常用方法和不同特点,提出了光学法非接触式测量活塞中凸形线和椭圆曲线的测量原理,并给出了误差分析和实验结果。 相似文献
80.
On the Use of Neural Networks and Geometrical Criteria for Localisation of Highly Irregular Elliptical Shapes 总被引：1，自引：0，他引：1
Detection of elliptical shapes is of extreme importance in several computer vision applications. In this paper a new method for irregular elliptical shapes localisation in multi-connected regions is described. This method first computes a set of elementary arc segments, which is then aggregated using geometrical decision criteria and a posteriori aggregation probabilities obtained from a neural network for Bayes classification. To identify and characterise the elementary arc segments, a cluster identification, a contour grouping strategy and some extensions to Fitzgibbon’s ellipse fitting method are introduced. These methods are applied successfully in the set-up of an automatic lime granule inspection system. The algorithm has proven to be very robust, since it is able to correctly detect elliptical shapes even when noisy data are present. Received: 2 November 1998, Received in revised form: 14 April 1999, Accepted: 6 May 1999 相似文献