Study on Wheel and Workpiece Position Error Influence on Surface Shape Accuracy during Ceramic Ball Grinding

The reasons for bringing surface accuracy error in uhra-precision grinding ceramic ball joint were analyzed, and the influences wheel position error and shaft run-out error on the ball joint surface accuracy were discussed. Through establishing three-dimensional grinding model, the mathematical relationship between the position error and surface accuracy was derived, and the distance from any point on spherical surface to the ideal center was calculated when position error existed, and a precise surface shape was got, and theoretical support was provided to improve the surface accuracy during the grinding process. Using self-developed ultra- precision grinding machine to do the ceramic ball grinding experiment, the surface accuracy PV value of ceramic spherical joint is 4. 8 μm.     

如何规避共同遗嘱公证执业风险

在十多年的《公证细则》的执行中,共同遗嘱一直是一个比较有争议的问题。我国现有的相关立法没有明文规定共同遗嘱的效力,共同遗嘱公证存在形式也有很多的争议,这一共同遗嘱的现状,不利于保护当事人的利益,发挥不了共同遗嘱在继承法上的作用。本文针对共同遗嘱公证,如何做好规避执业风险做一粗浅的探讨。     

中国旅游饭店餐饮经营模式研究

餐饮经营模式对旅游饭店的资源匹配、经营利润具有杠杆作用。不同经营模式决定不同工作策略。自主经营餐饮,要强化责任意识,仿真餐馆经营。结合经营餐饮,要有成熟的理念与运作。集团经营餐饮,要研究和落实中央厨房建设。品牌经营餐饮,要务实勤恳打造品牌。微缩经营餐饮,要便于集中精力从事客房经营。主题经营餐饮,要对主题文化进行维护与升华。     

快速交通背景下郑汴洛休闲旅游联动发展研究

交通是沟通旅游需求和旅游供给的桥梁与纽带,交通方式的变革将带动旅游业的迅速发展。文章着重研究了郑（郑州）汴（开封）洛（洛阳）三市的休闲旅游联动发展,针对其现状分析了存在的问题,并提出了实现途径,以期增强该地区乃至全省的整体旅游竞争优势。     

工程管理专业教育与执业资格教育研究

工程管理专业教育与注册工程师执业资格教育相衔接的人才培养模式有利于学生就业和执业．实施该模式的关键是提高学生实践环节的效果,而且需要对工程管理专业学生进行职业方向细分,大力推行校企联合及建立毕业生就业反馈机制．     

扩建变电站调试工作的安全风险分析与控制

随着电网建设的快速发展,运行变电站扩建现象越来越普遍,调试工作作为扩建工程项目的重要内容,其安全风险的分析与控制逐渐成为重要问题,文章主要从技术角度分析了变电站扩建工作过程中常见的调试工作安全风险,提出了风险控制措施,最后总结了调试工作安全风险控制的几点体会。     

全站仪放样的定位方法探讨

全站仪放样是土木工程施工定位的主要方法.针对施工现场的不同条件,根据各类土木工程对测量精度的不同要求,从棱镜与全站仪的有效配合入手,探讨全站仪放样的定位方法和技巧.     

“研究生论坛稿件”基于HSL颜色空间的自动白平衡算法研究

为解决自动白平衡算法对所有像素采用单一颜色修正系数存在的低照度色差过大的问题,提出根据HSL颜色空间亮度分量分段计算颜色修正系数自动白平衡计算方法。计算图像的HSL颜色空间,将亮度分量分成若干段,同一段像素归为一组,通过同一组中饱和度在灰轴附近像素的各颜色分量平均值计算该组的颜色修正系数,根据本组颜色修正系数对该组像素进行颜色修正。应用本文设计的实验电路,采集标准色卡在多种色温下的图像数据,运用HSL灰轴算法、灰度世界算法和全反射理论算法分别对采集的数据进行自动白平衡计算。对比分析每种算法的计算结果与标准色卡的颜色误差。颜色误差分析表明,HSL灰轴算法具有更好的光环境适应能力和颜色还原能力。     

Fairness-aware joint call admission control in heterogeneous wireless networks

In heterogeneous wireless networks, mobile terminals of different capabilities (heterogeneous terminals) will be used by subscribers to access network services. There is a problem of the unfairness in allocation of radio resources among heterogeneous mobile terminals in heterogeneous wireless networks. Low-capability mobile terminals (such as single-mode terminals) suffer high call blocking probability, whereas high-capability mobile terminals (such as quad-mode terminals) experience very low call blocking probability. This paper proposes a fairness-aware joint call admission control (JCAC) algorithm to reduce the unfairness. The proposed JCAC algorithm makes call admission decisions based on the mobile terminal modality (capability), network load, and radio access technology (RAT) influence index. Experimental results show that the proposed algorithm reduces the call blocking/dropping probability of low-capability mobile terminals, and improves fairness in allocation of radio resources among heterogeneous terminals.