一种新型环保建材——氯氧镁水泥复合保温材料

氯氧镁水泥也称Sorel水泥，是Sorel于1867年发明的。它具有许多优于波特兰水泥的性能：不需要湿养护，防火性能好，导热系数小，耐磨性好，早期强度高，耐油、抗有机溶剂等。     

基于控制点的服饰图案几何形态变换

图案几何形态决定了产品的视觉效果,形态变换是图案创新设计的重要途径之一.本文从图像视觉变换技术出发,利用图像控制点的坐标位置信息,实现服饰图案的快速变形.首先确定图案的中心点,根据角度和距离确定像素点相对于图案中心点的位置;然后依据该像素点、对应相同角度的原图像边缘点和新图像边缘点分别到中心点的距离,计算出像素点坐标变换的比例系数;再据此系数和极坐标与直角坐标的转换关系以确定该像素点新坐标的位置;遍历原图中每一个像素点,最终实现图案的几何形态变换.结果表明:该方法的实现有利于提升传统图案设计、加工效率和视觉效果,满足快速时尚的行业设计需求.     

一类诱导广义有序加权对数的连续区间有序加权调和平均算子及其应用

结合连续区间有序加权调和平均(C-OWHA)与诱导广义加权对数平均(IGOWLA)两类算子,提出了一类诱导广义有序加权对数的C-OWHA(IGOWLC-OWHA)算子.以改进的Theil不等系数为相关性准则,构造了一种基于IGOWLC-OWHA算子的区间组合预测模型.算例分析表明,该模型能有效提高预测精度.     

溶胶凝胶法制备Ca_3Co_4O_9及其性能分析

采用溶胶-凝胶法制备出了不同温度煅烧的Ca_3Co_4O_9热电材料样品,通过XRD、SEM、EDS、TG-DTA、IR以及气孔率的测量对样品进行了表征,结果表明,800℃煅烧为最佳温度,经800℃煅烧900℃烧结的样品的XRD图谱与标准JCPDS图谱保持一致,样品结构致密,气孔小,吸水性小,使得Ca_3Co_4O_9热电材料样品具有较低电阻率,较高塞贝克系数,在1 050K时功率因子达到180μW/(m·K~2)。     

认知特征与飞行技术水平关系的探究

本文对飞行技术的评定进行研究,然后对其人之分化进行了成套的检验,选择了80名公司飞行员,对他们的技术水平和认知能力进行了评定,从而能够分析出飞行员的认知特征与飞行水平之间存在的关系。通过对80名飞行员的认知特征和飞行技术水平之间的关系进行分析,可以看出,认知能力强的飞行员其飞行技术水平也比较高,空间认知的特征对飞行技术能够产生重要的影响,其作用能够高于言语的认知特征,从而在平时就要培养飞行员的认知能力。     

Dynamic buffering performance of the honeycomb paperboard filled with polyurethane

A new kind of composite buffering material was made by filling the voids of honeycomb paperboard with polyurethane. Drop tests were performed to evaluate the dynamic energy absorption capacity of the material. Based on the tests results, we analyzed the mechanical behaviors of the material under different conditions and obtained the inherent influencing laws of some factors on the material＇s dynamic buffering performance. It was shown that the dynamic buffering performance varied directly with impact velocity, and inversely with the void diameter, thickness and buffeting area of the composite material.     

岸坡应力场及卸荷带划分量化指标研究

由于河谷下切或者人工开挖造成的边坡卸荷以及卸荷带是我国西南地区的一种常见地质现象,而卸荷带的划分直接关系到岩质边坡的稳定性,从而影响建基面的选择.在分析金沙江梯级开发某水电站岸坡应力场的基础上,结合卸荷带的成因,使用卸荷裂隙线密度、张开度、弹性波波速和完整性系数4个量化指标进行卸荷带的划分.结合工程实际,使用卸荷量化指标对卸荷带进行划分,提出了对该工程区域卸荷带划分标准的建议.     

Specific energy optimization in sawing of rocks using Taguchi approah简

This work aims at selecting optimal operating variables to obtain the minimum specific energy （SE） in sawing of rocks. A particular granite was sampled and sawn by a fully automated circular diamond sawblades. The peripheral speed, the traverse speed, the cut depth and the flow rate of cooling fluid were selected as the operating variables. Taguchi approach was adopted as a statistical design of experimental technique for optimization studies. The results were evaluated based on the analysis of variance and signal-to-noise ratio （S/N ratio）. Statistically significant operating variables and their percentage contribution to the process were also determined. Additionally, a statistical model was developed to demonstrate the relationship between SE and operating variables using regression analysis and the model was then verified. It was found that the optimal combination of operating variables for minimum SE is the peripheral speed of 25 m/s, the traverse speed of 70 cm/min, the cut depth of 2 cm and the flow rate of cooling fluid of 100 mL/s. The cut depth and traverse speed were statistically determined as the significant operating variables affecting the SE, respectively. Furthermore, the regression model results reveal that the predictive model has a high applicability for practical applications.     

冷拔外螺纹铜管延伸系数计算公式的推导及验证

推导了外螺纹铜管拉伸延伸系数计算公式。通过理论计算与实验结果的比较．表明该公式有很高的计算精度，完全可以满足工艺计算要求。