民间陶瓷的现实意义

中国民间陶瓷流传远久,传递着中华大地自然的禀赋与历史的繁荣,不论造型结构、式样,或是装饰题材、内容,都是现代陶瓷艺术可借鉴的经验与成果,将民间陶瓷文化的视觉信息符号或元素融入现代陶瓷艺术之中,使民间的陶瓷语言转换为现代陶瓷艺术的话语应是当下陶艺创作的思考方向。     

On quantitative structure-activity relationships between hydrazine derivatives and β irradiation

In this study, solutions of hydrazine and its derivatives were irradiated using a pulsed electron beam to determine the half-reaction time of radiolysis. 3 D structures of the hydrazine derivatives were optimized, and their energies were calculated using density functional theory with the B3 LYP method and 6-311 +(3 d, 3 p) basis set.For the first time, the 3 D quantitative structure-activity relationship(QSAR) equation describing the relationship between the hydrazine derivative structures and rate of radiolysis has been established using SPSS software.Pearson correlation analysis revealed a close correlation between the total energies of the molecules and half-reaction times. In the QSAR equation, Y =-7583.464 +54.687 X_1+94333.586 X_2,Y,X_1,and X_2 are the half-reaction time, total energy of the molecule, and orbital transition energy, respectively. The significance levels of the regression coefficients were 0.006 and 0.031, i.e., both less than 0.05. Thus, this model fully explains the relationship between hydrazine derivatives and β radiolysis stability.The results show that the total energy of the molecule and orbital transition energy are the main factors that influence the β radiolysis stability of these hydrazine derivatives.     

Study on stress and deformation of keyhole gas tungsten arc-welded joints

Keyhole gas tungsten arc welding(K-TIG)of Q345 low alloy steel plates was simulated by using SYSWELD software.The temperature field of the K-TIG welding process was simulated with three different combined heat sources and was compared with the weld profile that was obtained experimentally.The temperature field that was obtained by a combination of a double ellipsoid heat source on the upper half and a three-dimensional Gauss heat source on the lower half was similar to the real situation.The effects of plate thickness,gap and welding speed on the deformation and stress of the K-TIG welded joints were investigated by K-TIG welding numerical simulation.A reduction in the thickness of the weld plates reduced the z-direction deformation and transverse residual stress;an appropriate gap reduced the residual stress and an increase in the welding speed reduced deformation after welding,but did not help to control the residual stress after welding.     

新型的自润滑高耐磨摩擦副铝基材料

介绍了一种加Bi的自润滑高耐磨摩擦副铝基材料,论述了国内外此类新型材料的应用现状和存在的问题.指出了控制合金中的Si相和Bi相尺寸,形态和分布是制备此类合金的关键.     

玄武岩纤维加固震损混凝土框架节点承载力计算分析

对5个不同损伤程度的框架节点采用玄武岩纤维加固后进行低周反复荷载试验。考虑混凝土框架节点受损修复后初始损伤的影响,提出构件修复后混凝土承载力折减系数;基于现行设计规范,建立玄武岩纤维加固混凝土框架节点考虑构件初始损伤的承载力计算公式,为震损混凝土构件的加固设计提供参考。     

一种RDP协议安全性改进方法

Windows系列服务器是目前最广泛使用的服务器之一．在许多情况下需要远程访问这些服务器的应用和信息．为了满足这些需要，微软设计开发了远程桌面协议（简称RDP）．分析了RDP协议及其多个实现产品的特性，特别是安全方面的特性，提出了集成实现SSL（TLS）与RDP的方案以增强其安全性，保证在Internet环境下的安全工作，并给出了实现方法，测试和分析了其性能．     

无人值班变电站运行中应注意的问题

越来越多的变电站进行无人化改造,无人值班变电站的运行维护工作已显得异常重要.但在运行过程中发现存在的几个问题却值得我们研究并进行改进,让无人值班变电站能够更加安全、稳定的运行。     

On the normal vector estimation for point cloud data from smooth surfaces

Reliable estimation of the normal vector at a discrete data point in a scanned cloud data set is essential to the correct implementation of modern CAD/CAM technologies when the continuous CAD model representation is not available. A new method based on fitted directional tangent vectors at the data point has been developed to determine its normal vector. A local Voronoi mesh, based on the 3D Voronoi diagram and the proposed mesh growing heuristic rules, is first created to identify the neighboring points that characterize the local geometry. These local Voronoi mesh neighbors are used to fit a group of quadric curves through which the directional tangent vectors are obtained. The normal vector is then determined by minimizing the variance of the dot products between a normal vector candidate and the associated directional tangent vectors. Implementation results from extensive simulated and practical point cloud data sets have demonstrated that the present method is robust and estimates normal vectors with reliable consistency in comparison with the existing plane fitting, quadric surface fitting, triangle-based area weighted average, and triangle-based angle weighted average methods.     

基于老年人视角公园声景四季变化研究 ——以南昌市人民公园为例

文章通过四季时间序列声学测量,采用SPL量化法和频谱分析法,揭示基于老年人视角下的城市公园声景四季变化规律.在南昌市人民公园,在利用声级计探究四季SPL趋势的基础上,再用LMS Test.Lab提取11个声学指标深入探究频谱变化规律.研究发现:公园四季声景SPL均在时间9:00～9:30达到最大值,其中夏季声景SPL水平高于其他季节,但春秋季声景SPL波动最大,冬季波动最小;8个声学指标均与声景四季变化有关,并在中低频段四季声压级均能达到最大值.声景季节变化符合实际,望为城市公园声景营造提供有效理论依据.