宣钢棒材加热炉悬臂辊道的改进

对宣钢棒材加热炉出入炉悬臂辊道漏水、烧损等现象进行了分析，提出了改进措施。     

Latchkey children and susceptibility to peer pressure: An ecological analysis.

Data on adolescents' after-school experiences and their susceptibility to peer pressure were derived from surveys administered to a heterogeneous sample of 865 adolescents in Grades 5–9. Consistent with the findings of previous studies, the results show that Ss who reported home after school were not significantly different from those who were supervised by their parents at home during after-school hours. However, when a 2nd sample of latchkey children (n?=?594) was studied to include greater variation in after-school experiences, Ss who were more removed from adult supervision were found to be more susceptible to peer pressure to engage in antisocial activity. Ss who were home alone were less susceptible to peer pressure than are those who were at a friend's house after school, and those who were at a friend's house, in turn, were less susceptible than were those who describe themselves as "hanging out." Moreover, latchkey Ss whose parents knew their whereabouts and those who had been raised authoritatively were less susceptible to peer influence than were their peers, even if their afternoons were spent in contexts in which adult supervision was lax and susceptibility to peer pressure was generally high. (17 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于光纤传感技术的泥石流冲击力测量系统与反演方法

目前水槽实验一般采用压电式压力传感器测量泥石流冲击力,这种传统测量模式的电信号易受电线阻抗效应的影响,且没有考虑测量装置受冲击变形对测量结果所产生的影响。针对以上问题,基于光纤布拉格光栅(Fiber Bragg Grating,FBG)传感技术,设计了悬臂梁式泥石流冲击力测量系统; 基于泥石流的宾汉体模型和受冲击体的本构关系,构建了包含中心波长最大偏移量、结构材料弹性模量和流深的泥石流最大冲击力反演公式。依据测量系统的力-光耦合效应设计水槽实验,开展了7组不同密度(1.8、1.9、2.0 g·cm^-3)的冲击实验工况。结果表明:①数据之间呈现较好的规律性,光纤布拉格光栅中心波长最大偏移量随着密度的增加而增大,同一密度下光纤布拉格光栅中心波长变化过程与泥石流冲击过程相吻合,从而验证了冲击力反演模型和测量系统之间具有良好的适应性; ②冲击力峰值为30.75～74.06 kPa,冲击力系数为0.92～1.95,与泥石流冲击特性相吻合,进而验证了本测量系统在克服传统压电式压力传感器自身缺陷的同时,亦能实现冲击力的稳定可靠测量。     

耦合弯曲-剪切载荷L型压电振子的低宽频特性

针对传统的压电能量采集装置固有频率高、工作频率范围窄及能量转换率低的问题,基于Timoshenko梁理论提出耦合弯曲-剪切载荷的L型压电振子,研究基于L型压电振子的复合压电结构的能量采集特性. 根据无线传感器的作业环境特点,研究L型悬臂梁的长度、宽度及延伸段长等因素对压电能量采集频率、输出电压峰值及能量转换效率的影响规律. 组合不同尺寸L型压电悬臂梁,研究设计回字形布局的阵列式复合振子. 经仿真分析与实验验证结果可知,在0~250 Hz低频环境下,能量采集频率为28~36 Hz、61~68 Hz、92~99 Hz以及103~111 Hz,较等尺寸传统阵列式压电复合振子覆盖频率平均提升了260%.     

关于电子皮带秤挂码标定的探讨

在电子皮带秤称量输送物料的传输系统中,当出现对实物标定困难和安装位置不便于链码标定的计量点时,简单、易行的选择就是进行挂码标定。笔者就怎样减少挂码标定的误差,获得较高的标定精确度等,进行了探讨,可供相关专业参考。     

人民币汇率机制改革中参考一篮子货币的思考

分析了人民币汇率机制改革中选择“参考一篮子货币”制的原因;在肯定这次汇率制度改革给我国带来的有利影响,同时指出了参考一篮子货币制在短期内将面临的问题,并进一步提出关于完善该汇率制度的相关措施和建议,以期对我国汇率制度改革提供参考。     

基于无线传感器网络的压电能量收集技术

随着物联网的发展,多节点的传感器供电成为关键问题,由于环境中普遍存在低频振动,采用了压电悬臂梁结构,建立压电悬臂梁结构的电学模型,并进行了ANSYS的仿真,仿真得到电压76 V,约等于模型的理论值,验证了模型的正确性。进而继续研究了压电悬臂梁几何尺寸对固有频率的影响,振子越长,质量块越长,频率越低。从而收集低频振动环境中的能量,为传感器供电装置提供了设计的理论依据。     

A110－1－H／A110－1型氨合成催化剂在双筐并流合成塔中的使用

在双筐并流氨合成塔中使用了Ａ１１０－１－Ｈ／Ａ１１０－１型氨合成催化剂，使用寿命达１７４０天，累计产氨４３８３７８ｔ．该催化剂组合具有低温活性好、易还原、高催化活性、高抗毒能力、良好的热稳定性与破碎强度等优点．     

搅拌设备设计的几点体会

从搅拌轴的支承条件、轴承间最佳距离的确定以及搅拌轴的稳定器等几个方面讨论 ,分析了其对搅拌设备设计的影响 ,并提出了相应的措施和方法。     

可控式循环通断程序的算法

本文重点介绍了采用梯形图编写的一个程序算法,使用该算法,可以解决高炉上料时,由于炉料中粉末多而引起的高炉悬料情况的发生.