汽拖AV40-11轴流压缩机组在广钢420m3高炉上的应用

本文主要介绍了广钢汽拖AV40-11轴流压缩机组的结构和特点，控制系统概要、应用效果。     

银川部分污灌区生产大米铅含量分析

采用电感耦合等离子体-原子发射光谱(ICP-AES),测定分析了银川地区紫金花造纸厂污灌区生产大米的铅的质量分数.分析结果显示:该污灌区生产大米中铅的质量分数平均值为4.5mg/kg(n=5),RSD<1%,超过国家对食品中铅的质量分数规定的最高限定值10倍,说明该大米已不能食用;由于尚未超过国家对动物饲料规定的铅的质量分数的最高限定值,因此它尚可作为饲料,但已接近临界状态.     

激光电视全息技术及其在无损检测中的应用

激光电视全息技术是一种测量物体表面微小变形的非接触式测量技术.与常规检测方法相比,它具有高精度、全场、实时测量等特点,有着重要的理论研究和实用价值,是当前无损检测领域研究热点之一.本文介绍了激光电视全息技术的基本原理和特点、国内外在无损检测领域的应用成果和最新研究进展,并探讨了未来的发展趋势.     

Properties of Magnetic Nanoparticles about Doped Rare Earth and Its Composites

The magnetic liquid was prepared with ferric salt by inorganic gel technology. The effect of the doped rare earth elements on the properties of magnetic particles was analyzed. The magnetic liquid was composed with clay mineral into magnetic mineral composites. The crystal structure and micro-morphology of the nanoparticles were studied by XRD and TEM. The results show that the crystal structure of the magnetic particles doped 0.5 % of lanthanum is more complete, and the magnetic response capability is higher with doping agent. At the same time, the possibility of the clay mineral magnetic composites as the carrier of target drug was probed.     

城乡二元结构背景下中小学教师队伍的求变之路——以重庆市为例

城乡二元结构体制对教育产生了深刻的影响,尤其制约着农村教育的发展,优先发展教育,就必须优先发展教师教育,是实现城乡统筹发展背景下重庆市基础教育均衡发展的基本思路和策略选择.基于重庆市中小学教师队伍存在的问题,建议从完善政策保障机制、资源的优化配置、完善师资队伍培训机制、创新教师培养模式等方面来优化重庆市中小学教师队伍.     

基于双阶段多尺度生成对抗网络的图像复原方法

针对人脸图像复原任务中对图像尺度信息利用不足和眼镜结构复原错误的问题,提出一种基于双阶段多尺度生成对 抗网络复原模型。该模型第1阶段引入改进损失的U-Net 粗重构网络,利用跳连接减少原始图像信息的丢失,融合3种不同 的损失函数提高生成器的重构能力,采用双判别器考虑全局信息和局部信息,并提出一种混合域注意力机制用于关注图像的 空间和通道信息。第2阶段的精修复网络构建了全新的特征增强模块,增强网络对细节信息的提取能力和对结构的表达能 力,引入相对判别器,用于关注生成样本与真实样本之间的相对真实性,提高了生成质量和训练稳定性。实验结果表明,该方 法能够复原各类图像缺失的情况,并能够有效复原佩戴眼镜的人脸图像,与其他方法相比,该方法的峰值信噪比、结构相似性 和感知相似度评估等指标分别提升了3.81%、2.65%和0.45%。     

Performance of N95 elastomeric respirators in high humidity and high coal dust concentration environmentOA

High humidity and high dust concentration in deep coal mines may severely challenge the performance of respirators worn by coal miners.This paper aims at quantitatively evaluating the respirators used in deep coal mines and providing scientific guidance for the respiratory protection of miners.Based on the self-designed in-situ PM_2.5collector,controllable PM_2.5generator,human breathing simulator,and respirator simulation testing system,under the simulated deep mine working ...     

膨胀土地区开挖渠道滑坡的规律与特征

在安徽省近百处开挖渠道滑坡分析的基础上,结合工程地质条件,对膨胀土地区开挖渠道滑坡在滑动面的形态及其形成、滑坡过程和滑坡分布等方面的规律和特征进行了研究。     

Modeling and finite element analysis of rod and wire steel rolling process

Two thermomechanical coupled elastic-plastic finite element （FE） models were developed for predicting the 12-pass continuous rolling process of GCrl 5 rod and wire steel. The distances between stands in the proposed models were set according to the actual values, and the billets were shortened in the models to reduce the calculation time. To keep the continuity of simulation, a technique was developed to transfer temperature data between the meshes of different models in terms of nodal parameters by interpolation functions. The different process variables related to the rolling process, such as temperature, total equivalent plastic strain, equivalent plastic strain rate, and contact friction force, were analyzed. Also, the proposed models were applied to analyze the reason for the occurrence of an excessive spread in width. Meanwhile, it was also utilized to assess the influence of the roll diameter change on the simulated results such as temperature and rolling force. The simulated results of temperature are found to agree well with the measured results.     

一种新型超磁致压电混合精密位移机构的研究

为了研究大步距高精度精密位移机构,利用超磁致伸缩材料和压电陶瓷材料在驱动原理和使用方法上的相似性,提出一种超磁致伸缩材料与压电叠堆组成的混合驱动精密位移机构,介绍了机构运动原理及控制方式,制作了试验样机.测试表明,所研制的混合精密位移机构能实现双向可控运动,单步前进最大位移可达20μm,调节驱动电压可控制单步位移量,能满足大步距、高精度的驱动要求.