扫描图像线状要素的粘连分离

提出了一种扫描图像线状要素粘连分离的算法,可有效地将扫描图像中不同线宽的线状要素间的粘连进行分离,在粘连分离的同时获得了线状要素的线宽信息,实现了不同线宽线状要素的识别。通过实际算例说明了算法的有效性与实用性。     

中厚钢板轮廓检测中线激光端点提取算法研究

提出了一种基于二次投影的边缘信息提取算法,并将这种算法应用于线激光端点的坐标提取.利用面阵CMOS相机获取入射在中厚板带钢表面的线激光图像,利用一次投影算法对预处理后图像进行处理,提取图像中激光线中心线的纵向位置坐标,并以它为基准,上下各取2行共5行作为提取图像中激光线端点位置坐标的目标行;然后,利用二次投影改进算法对这5行激光线分别进行处理,获取每行激光线端点的亚像素位置坐标,对该坐标值进行加权平均处理,所得值即为图像中激光线的端点位置坐标.所提出的二次投影改进算法不仅实现了目前中厚板形貌的非接触式测量,也提高了实际应用的检测精度.该算法光线端点检测精度可达0.003 5 pixel,在工程中具有较大的应用价值.     

基于数学形态学的扫描地形图线状要素自动分类

用数学形态学理论对扫描地形图的线状要素进行分类的方法，及相应的算法，实现了对扫描图像中具有不同线宽线状要素的分类。通过实际算例说明了所提出的算法的有效性与实用性。此法对扫描地形图和工程图的线状要素分类有很大的适用价值。     

基于电子地图的遥感影像自动粗定位研究

在GIS的基础上,提出了一种新的遥感图像自动定位方法．将GIS技术和遥感技术相结合．利用GIS软件从电子地图中提取出线状图层一定范围内各点的经纬度坐标,将这些信息作为参考源．同时对遥感图像进行二值化和边沿提取,将提取出来的遥感图像的线状特征作为目标源,然后在分辨率匹配和投影变换的基础上对二者进行匹配,引入Hausdorff距离作为相似性测度,最后获取遥感图像的定位信息．     

基于改进的自适应噪声消除和故障特征阶比谱的齿轮噪源干扰下变转速滚动轴承故障诊断

变转速工作模式和齿轮噪源干扰是阻碍滚动轴承故障诊断的两个难题。虽然基于转速信号的角域重采样技术和基于参考信号的自适应噪声消除算法为这两个问题提供了可靠的解决路线,但是由于安装空间和成本的限制,转速信息和参考信号在实际工程中往往难以获取。为解决这一难题,提出了一种不依靠上述辅助设备的滚动轴承故障诊断新算法。整个算法由五部分组成:(1)利用峰值啮合倍频趋势线构造参考信号对混合信号进行自适应滤波以削弱齿轮噪源对轴承故障共振频带获取的干扰;(2)利用谱峭度快速算法确定由轴承故障引起的高频共振所对应的中心频率,滤波带宽和对应的尺度并直接得到最能反映轴承故障的滤波包络;(3)利用短时傅里叶变换求得两次滤波后包络信号的包络时频谱并利用峰值搜索算法对瞬时故障特征频率趋势线进行提取;(4)提出基于采样频率重调的重采样算法,对谱峭度滤波结果进行故障阶比域重采样;(5)利用傅里叶变换求取重采样信号的故障特征阶比谱,并提出新的故障诊断策略对滚动轴承的运行状态进行判断。仿真算例和应用实例证明了该算法的有效性。     

基于层次包围盒的配电网电气接线图自动生成算法

针对配电线的地理接线图自动转换为单线图时,线和设备的重叠交叉问题,该文提出了一种基于层次包围盒技术的自动成图排布算法;针对层次包围盒不紧密性造成的空间浪费,提出了一种对排布方向可能相交的临近路径的包围盒进行相交检测,及时利用空闲空间排布线路的方法。算法支持架空、地缆及混合型的区域电气接线图,真正解决了实际应用问题。     

Alpha-Shapes分段改进算法在三维模拟树枝体积扫描测量中的应用

针对树木与树枝分叉部分体积计算困难,三维扫描建模易产生黏连现象等问题,提出一种Alpha-Shapes分段改进算法.通过三维激光扫描技术获取三维模拟树枝的点云数据,利用Alpha-Shapes算法计算出三维模拟树枝的点云边缘轮廓并进行三维重建,利用分段算法对三维重建数据进行体积分割计算,通过点云最高层补偿以此保证分段算...     

基于图像全站仪的椭圆目标自动测量

为解决全站仪自动化测量过程中在无法布设棱镜情况下反射片靶标识别距离短、精度低的问题,该文基于智能型全站仪自动照准的原理,通过图像全站仪对测点靶标进行拍照获取影像,利用图像处理算法对椭圆目标进行图像处理拟合中心位置,从而实现对靶标的自动测量。通过测试,在135 m的观测距离内,利用该文的自动照准,图像全站仪可以达到mm级别的测量精度。     

激光器自动锁频方法研究综述

介绍了激光自动锁频的意义与目的,阐述了实现激光自动锁频的算法和常用的光学频率参考,分析了不同算法和频率参考的区别和优劣,探讨了在自动领域下实现激光锁频需要解决的问题和方法,指出了有待加强的领域,提出了部分仍待解决的困难,得出了当前激光自动锁频领域的发展方向和改良趋势,为激光器自动锁频的后续研究提供了参考。     

快速成型技术中分段算法的研究综述

在快速成型技术中,模型分段处理是分层处理的前一步骤,对分段算法进行研究十分有必要.为此,对快速成型技术中的分段算法进行总结,主要从人机交互分段和自动分段两方面展开.对于人机交互分段算法,主要从根据不同成型要求进行分段方面展开叙述;对于自动分段算法,主要介绍了体素化分段算法、特征识别式分段算法、多目标优化分段算法和聚类式...     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.