聚乙烯/石墨阻燃复合材料的研究

研究了石墨、可膨胀石墨、膨胀石墨 /聚乙烯复合材料的阻燃性能。结果表明 ,石墨具有一定的阻燃作用 ,可膨胀石墨具有良好的阻燃效果。但可膨胀石墨填充的复合材料力学性能较差     

钢质硫酸容器防腐蚀的电化学阳极保护

腐蚀环境中电化学阳极保护的应用领域很窄，它对仪器设备、调试运行以及电流控制都有严格的要求。介绍了电化学阳极保护的原理、主要参数的控制和适用范围等，建议有关部门制订技术规范。     

波节式换热管压缩失稳试验研究

通过对不同材料、直径和壁厚的波节式换热管进行压缩失稳试验,绘出应力和应变强度关系曲线,指出直光管经胀管成型为波节管后,应力状态分布明显不同于光管,壁厚和直径等规格尺寸的不同会影响波纹管的强度性能.     

悬浮液进样-火焰原子吸收光谱法测定茶叶中的微量铬

将茶叶悬浮于琼脂胶体中制成悬浮液 ,直接喷入空气 -乙炔火焰 ,用火焰原子吸收光谱法测定茶叶中的微量铬 ,方法简便、快速、灵敏度和精密度高、测定结果与用灰化法处理样品一致 ,检验表明 ,两种样品前处理方法之间无显著性差异。相对标准偏差为 3.4 %～ 6 .1% ,加标回收率为 95 .7%～ 10 3.8 %。     

Deformation and failure study of surrounding rocks of dynamic pressure roadways in deep mines

In order to understand the change rules of stress-displacement in surrounding rocks of dynamic pressure roadways in deep mines and to obtain a theoretical basis for analyses of roadway stability and designs of support,we established a coupling equation of adjacent rock strength,mining stress and supporting resistance on the basis of an elastic-plastic theory of mechanics.We obtained an analytical solution for stress and displacement distribution of elastic and plastic regions in surrounding rock of dynamic pressure roadway..Based on this theory,we have analyzed the changes in stress-displacement in elastic and plastic regions of surrounding rocks of dynamic pressure roadways in the Haizi Coal Mine.The results show that:1) radial and tangential stress change violently within the first 4 m from the inner surface of a roadway after excavation;radial stress increases while tangential stress decreases within a range of about 6 m from the inner surface of the roadway as a function of q3;2) radial and tangential stress increase with an increase in the mining pressure coefficient k;the increase in the rate of tangential stress is greater than that of radial stress;3) the radial displacement of the inner surface of roadways decreases with an increase in q3,provided that k remains unchanged.     

高性能电极接头栓的研制

研制了高粘结强度、低电阻率、高渗透性能接头栓,并说明了改进的目标和方向。研究了电极接头栓的使用性能、主要作用和选用接头栓补救电极和接头连接质量的优点;研究了电极接头栓的原料选择、原料配比、添加剂和发泡剂的选取;确定了电极接头栓的生产技术要求和生产工艺流程。试验证明,研制的高性能接头栓具有高粘结、强固结、有效补强的作用。     

三氯异氰尿酸生产技术研究

对三氯异氰尿酸合成反应过程中的主要工艺参数进行分析和实验研究,并成功地开发出了连续法生产三氯异氰尿酸的新工艺,该工艺和传统工艺相比,具有生产安全、高效、节能的特点。     

膜生物反应器在废水处理中的应用

膜生物反应器 (MembraneBio -Reactor ,MBR)是一种传统活性污泥法的改进技术 ,它应用于给水和废水处理的研究发展过程。介绍了膜生物反应器的发展状况、结构形式、优点和应用领域。     

卡尔曼滤波算法在MEMS热式风速风向传感器中的应用

针对MEMS热式风速风向传感器在实际使用过程中因噪声问题导致输出不稳定的现象,本文首次采用了卡尔曼(Kalman)滤波算法对本征白噪声进行滤波处理,从而优化传感器的输出性能.本文分别通过理论分析和仿真模拟证明了Kalman滤波算法的可行性.实验结果表明,通过调节相关参数,Kalman滤波算法在滤波效果、响应速度及误差上均优于传统的加权滑动均值滤波算法.除此之外,在消耗较少资源的前提下,Kalman滤波算法可以有效减少本征白噪声的干扰,且调节空间较大,可以适应不同的应用需求.     

Design of the low power wake-up receiver for internet of things communication

A wake-up receiver with high energy efficiency and low power consumption is proposed for solving the power consuming problems of wireless nodes communication in the Internet of Things. The proposed wake-up receiver based on the wake-up mechanism can effectively schedule the network nodes communication, and use the simple envelope detection structure to achieve frequency down-conversion, which can flexibly manage energy and reduce power consumption. Based on UMC 65nm CMOS process technology, the wake-up receiver is designed and simulated. The results show that it can achieve S₁₁ of -21dBm and a sensitivity of -75dBm at a data rate of 1Mb/s, when operating at the central frequency of 780MHz and input signal adopting an on-off keying (OOK) modulation, and the power consumption is 82μW at 1.2V voltage supply.