A technique for recording polycrystalline structure and orientation during in situ deformation cycles of rock analogues using an automated fabric analyser

Two in situ plane-strain deformation experiments on norcamphor and natural ice using synchronous recording of crystal c-axis orientations have been performed with an automated fabric analyser and a newly developed sample press and deformation stage. Without interrupting the deformation experiment, c-axis orientations are determined for each pixel in a 5 × 5 mm sample area at a spatial resolution of 5 μm/pixel. In the case of norcamphor, changes in microstructures and associated crystallographic information, at a strain rate of ～2 × 10(-5) s(-1), were recorded for the first time during a complete in situ deformation-cycle experiment that consisted of an annealing, deformation and post-deformation annealing path. In the case of natural ice, slower external strain rates (～1 × 10(-6) s(-1)) enabled the investigation of small changes in the polycrystal aggregate's crystallography and microstructure for small amounts of strain. The technical setup and first results from the experiments are presented.     

加工中心主轴准停常见故障诊断与维修

以实例的形式给出加工中心主轴准停装置几种常见的故障现象,并说明维修排障的具体方法,对加工中心的实际维护与维修具有指导意义.     

新世纪我国道德教育面临的挑战

国际形势的变化、社会经济的变化和科技的发展，导致人们的思想观念、道德意识和价值取向发生了前所未有的变化。这些变化使我国的道德教育面临一系列挑战。我们可以从道德教育的民族性与世界性、进行性与协调性、超前性与现实性等方面去应对这些挑战。     

New Theoretical Model for Two-Phase Flow Discharged from Stratified Two-Phase Region through Small Break

A theoretical and experimental study was conducted to understand two-phase flow discharged from a stratified two-phase region through a small break. This problem is important for an analysis of a small break loss-of-coolant accident (LOCA) in a light water reactor (LWR). The present theoretical results show that a break quality is a function of h/h_b , where h is the elevation difference between a bulk water level in the upstream region and the break and b the suffix for entrainment initiation. This result is consistent with existing experimental results in literature. An air-water experiment was also conducted changing a break orientation as an experimental parameter to develop and assess the model. Comparisons between the model and the experimental results show that the present model can satisfactorily predict the flow rate and the quality at the break without using any adjusting constant when liquid entrainment occurs in a stratified two-phase region. When gas entrainment occurs, the experimental data are correlated well by using a single empirical constant.     

Determinants of right–left and top–bottom prevalence for two-dimensional spatial compatibility.

When stimulus and response sets vary along horizontal and vertical dimensions, the horizontal dimension is more dominant than the vertical one, an effect called right–left prevalence. Three accounts have been proposed that attribute the effect to a reduced ability to code vertical locations when horizontal codes are also present, the use of right–left effectors, or a difference in salience of the 2 dimensions. The accounts differ in terms of whether the ability to code and process the 2 dimensions is of limited capacity and whether the prevalence effect is a consequence of the effectors used for responding. The authors report 4 experiments that evaluated these issues. Results indicate that use of right–left effectors is important to the right–left prevalence effect because it increases the salience of the horizontal dimension. However, a top–bottom prevalence effect can be obtained if the vertical dimension is made more salient. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Improved localization in a generalized Hough scheme for the detection of straight edges

Hough transforms are widely used for the location of straight edges in digital images, yet most common line parametrization schemes give no information on longitudinal localization. The generalized Hough transform goes some way to overcoming this problem. This paper studies how to improve the situation further. A trade-off between sensitivity and localization is found; in practical situations this results in significantly greater accuracy, but the important gain is a reduction in the number of ambiguities introduced by interactions between the transforms of unrelated straight edges.     

云计算环境下的一种高效的资源管理策略

近年,随着物联网相关研究工作的深入进行和新业务需求的日益增长,基于物联网技术的各种应用系统不断涌现。通常,人们希望智能物具有环境场所感知能力,因此提出一种基于物联网技术的场所感知应用系统。首先,围绕信息物品维、自主网络维、智能应用维3个维度构建该系统的体系结构,并分析了系统中主要实体间的关系;其次,讨论了体系结构中面向场所感知的专门部件的关键支撑技术及其发展方向,主要涉及环境物位姿传感、场所感知智能应用两个方面,其中,特别地给出一种物联网条件下可行的场所感知算法;最后,通过仿真实验验证了该系统的感知效果。     

傅立叶描述子识别物体的形状

傅立叶描述子是分析和识别物体形状的重要方法之一，利用基于曲线多边形近似的连续傅立叶变换方法计算傅立叶描述子，并通过形状的主方向消除边界起始点相位影响的方法，定义了新的具有旋转，平移和尺度不变性的归一化傅立叶描述子，与使用离散傅立叶变换和模归一化的传统傅立叶描述了相比，新的归一化傅立叶描述于同时保留了模与相位特性，因此能够更好地识别物体的形状，实验表明这种新的归一化傅立叶描述子比传统的傅立叶描述子能够更加高效，准确地识别物体的形状。     

一种计算驾驶人面部朝向角度算法

利用机器视觉对驾驶人疲劳状态及注意力状态进行监测和分析是安全辅助驾驶领域内的研究热点之一,而对驾驶人面部朝向角度进行计算则是注意力状态分析的前提条件。首先介绍了驾驶人面部及面部器官定位的思路,然后重点讨论了驾驶人面部朝向的技术环节,在对人体头部旋转运动的分析基础上,提出了计算驾驶人面部旋转角度的计算方法。实践证明,采用的处理算法实时性好,准确率较高,效果非常理想,为下一步的驾驶人注意力状态分析及相关信息提取打下了良好的基础。     

基于意群划分的中文微博情感倾向分析研究

微博作为一种新兴的社交网络平台,逐渐成为公众发布个人信息,获取实时信息,表达个人观点的新平台。针对微博情感倾向判断的问题,提出了一种基于意群划分的中文微博情感倾向分析(STDSG)方法。引入意群的概念,提出微博意群划分算法,根据意群间的关系,考虑否定词、程度词及标点符号的对情感倾向分析的影响,提出计算微博意群情感倾向的方法。在给定的数据集上,实验结果准确率达到了80.1%,总体性能优于基于情感词典的方法及基于支持向量机的方法。