Tensile mechanical behavior of T300 and M40J fiber bundles at different strain rate

Tensile mechanical behavior of T300 fiber bundles and M40J fiber bundles have been studied in the strain rate range from 0.001 1/s to 1300 1/s and complete stress strain curves were obtained. Results show that both ultimate strength and failure strain of two materials are strain rate insensitive, and T300 fiber and M40J fiber can be regarded as strain rate insensitive materials. On basis of the fiber bundles model and the statistic theory of fiber strength, single Weibull distribution model and bimodal Weibull distribution model have been developed to describe mechanical behavior of fiber bundles. And a method for determine the statistic parameters of fibers by tensile tests of fiber bundles is established, too. The simulated stress strain curves from the model are in good agreement with the test data. Simulated results show that the strength of T300 fiber can be described by single Weibull distribution function, and the strength of M40J fiber should be described by bimodal Weibull distribution function.     

煤头氨(醇)厂重大危险源辨识

根据GB18218—2000《重大危险源辨识》,进行了重大危险源辨识方法的分析。对煤头氨(醇)厂生产场所重大危险源进行辨识,确定至少有半水煤气气柜、氨储罐区和甲醇储罐区3个重大危险源。     

Co-reaction of Ethene and Methylation Agents over SAPO-34 and ZSM-22

Co-reaction of ethene and different methylation agents (i.e. methanol and chloromethane) was carried out over SAPO-34 and ZSM-22 and the results are compared. It was found that the enhancement of ethene conversion was achieved by co-feeding it with methylation agents. In the ethene–chloromethane system, the methylation of ethene by chloromethane was more prominent compared with that of the co-reaction of ethene and methanol. The reasons for the differences between ethene–methanol and ethene–chloromethane co-reaction system are discussed. Complete suppress of direct conversion of methanol or ethene could be achieved over ZSM-22 by pre-coking, and propene selectivity higher than 80% was obtained at lower conversions.     

舰基测量雷达修正方法研究

针对海上靶场舰载测量雷达实时姿态测量困难,雷达天线中心点实时坐标难以精确测量的问题,综合考虑靶场现有的试验保障能力、装备布设及参试情况,提出了一种基于多GPS天线的载体姿态实时测量和测量点位实时修正与雷达零位误差动态修正相结合的雷达测量信息修正方法。给出了详细的雷达测量信息修正方法、修正模型及修正流程,并对修正误差进行了分析。实际应用及测试结果表明,提出的方法能够以较低的成本实现高精度的雷达天线中心坐标实时测量及雷达测量信息姿态修正,有效解决了舰载测量雷达实时姿态测量和部位修正问题。     

机构综合的参数耦合概率超混沌牛顿迭代法研究

自然科学与工程中的许多问题都可以转化为非线性方程组的求解问题。牛顿迭代法是重要的一维及多维的迭代技术,其迭代本身对初始点非常敏感。应用参数耦合超混沌系统产生初始点,分析了混沌序列的概率特性,首次提出了基于参数耦合概率超混沌的牛顿迭代法求解非线性方程组的新方法。机构综合与近似综合实例表明了该方法的正确性与有效性。     

碰摩转子弯扭摆耦合振动非线性动力学特性

为进一步提高旋转轴系的安全性,研究旋转轴系弯扭摆振动耦合振动问题.推导一般意义下,考虑陀螺力矩的单盘转子弯扭摆耦合振动非线性方程,基于该方程推出不平衡转子和碰摩转子的非线性弯扭摆耦合振动方程.应用数值方法研究碰摩转子弯扭摆耦合振动相应的复杂动力学行为,研究转子转速对碰摩转子弯扭摆耦合振动的分岔和混沌行为的影响,以及扭转振动和摆动振动对弯曲振动的影响.分析结果为转子的安全运行和弯扭摆耦合振动故障的判别提供了理论依据.     

室外型UPS系统在移动通信中的使用

介绍了室外型 Ｕ ＰＳ 的技术指标，分析了室外型 Ｕ ＰＳ 在移动通信中的应用以及面临的问题。     

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研究了川中充西地区香四段储层的孔隙类型、孔隙度、渗透率、含水饱合度等特征,表明该层具有产气能力。岩心产能全模拟试验表明,当生产压差为6 MPa时,香四段气藏可达到0.5×104 m3/d工业产气标准,当生产压差增至10 MPa时,单井产量可达到（2.5~3.0）×104 m3/d,为一低产能气藏。动态损害模拟表明产层已受到损害,单井产量损害了25%~50%;开井生产初期气相渗透率大于0.2×10-3μm2,产水时气相渗透率小于0.05×10-3μm2,生产中可产出少量原生水,研究结果与该区测试资料基本吻合。     

川东北PG构造三叠系飞仙关组台缘鲕滩储层特征

四川盆地东北部PG构造三叠系飞仙关组台缘鲕滩储层为一套残余砂屑、藻屑鲕粒白云岩和残余鲕粒白云岩。经白云石化和溶蚀作用，溶蚀孔、洞和裂缝十分发育。储层厚逾300 m，离油源近，具有良好的运移和保存条件。通过野外地质分析、镜下鉴定、岩心分析、水饱和度测定及压汞资料统计分析得知，储层孔隙度为0.5%~25.7%，平均为7.55%；渗透率为（0.011~3355.1）×10^-3μm²，平均为25.2×10^-3μm²，含水饱和度在1.4%~52.13%，平均为14%；毛细管压力曲线的排驱压力为0.08~25 MPa，饱和度中值压力为0.2~70 MPa，与同类碳酸盐岩相比，该段储层储渗性、孔隙结构好、含水饱和度低，该套台缘鲕滩厚度为300 m，是本区油气勘探的最有利目标。     

塔式起重机回转系统的改进设计

1 问题的提出 塔式起重机工作系统分为起升、回转、变幅三大系统,回转系统主要由回转支承、回转机构、上下回转支座等组成,本文分析对回转支承等一系列改进设计及其中所涉及的几点注意事项.