J-Resolution Fields of Generalized Literals of L14 P（X）

Introduction In order to study the lattice-valued logic system,Xu[1]proposed the concept of lattice implication alge-bra by combining the lattice with the implication alge-bra and discussed its properties systematically. InRefs.[2,3], a lattice-valued propositional logic sys-tem was established using the concepts of free alge-bra, which corresponds to the lattice implication alge-bra, and the semantic and syntactical problems of thissystem were discussed. Xu et al[4]extended the reso-lution p…     

桥梁墩台滑模施工技术

通过丰富的施工实践,从技术方面对桥梁墩台滑模施工进行了系统的归纳总结,并对施工时要特别注意的几点事项进行了说明,以期使滑模工艺得到进一步的推广应用。     

太行山隧道进口断层破碎围岩段施工技术

主要介绍太行山隧道进口断层破碎围岩段及影响地段保持和控制工程地质体稳定的措施和施工手段，以及通过监控量测，来调整和修正围岩开挖支护参数，优化施工方案。     

道路排水管顶管施工技术

介绍了在城市道路排水管道施工时,因埋深较大,地下水位高于设计排水管顶情况下,采用的顶管法施工技术,以及在顶管施工中出现的问题和处理方法。     

基于灰色系统理论的橡胶粉改性沥青制备工艺研究

运用灰色系统理论,以橡胶粉改性沥青的针入度、软化点和延度等指标为系统目标,分析了在改性沥青制备过程中,影响橡胶粉改性沥青性能的各主要因素间的主次关系,为橡胶粉改性沥青的制备工艺的优化提供依据。     

THE EDDY LOSSES OF A MAGNETIC THRUST BEARING

Accurate calculations of losses associated with the operation of magnetic bearings are particularly important for high speed applications where the rotor losses are expected to be large and for some particular applications where even low power losses will be critical. Power losses in the magnetic thrust bearing is often neglected, but if there is misaligned in the rotor and bearing, the magnetic field in the thrust bearing is no longer axisymmetric one, or the dynamic control current in the winding is time dependent one, eddy currents are caused to flow inside the conducting material, then the power losses are very important for magnetic bearing design. This paper presents an analytical model of a thrust magnetic bearing, and the magnetic fields, forces and losses of thrust magnetic bearing are calculated. In the calculations the frequency of dynamic control current is up to 1 000 Hz, rotating speed is from 60 rpm to 1 200 rpm, and the non-linearity of material is also taken into consideration. The results shows that if the magnetic field is not saturation, the eddy losses is proportional to dynamic control current frequency and a square function of dynamic control current, and also 5/2 power function of shafts speed.     

脉冲强磁场处理高速钢刀具磨损机理的探讨

本文研究了用高速钢车刀切削45钢时,脉冲强磁场处理减小刀具磨损的机理:研究了磁化场强度及切削速度对刀具磨损的影响;考察了硬度及金相显微组织的变化;证明了在脉冲强磁场处理下,刀具材料强化的主要原因是碳化物的弥散析出所导致的弥散硬化效果的作用.     

热障涂层应力场的微拉曼光谱技术测试研究

采用等离子体喷涂工艺制备了热障涂层实验样品,在不同高温下进行热循环氧化实验。再应用微拉曼光谱法测量了热障涂层样品内残余应力场大小,并分析了试样尺寸、热处理温度和陶瓷涂层厚度对残余应力的影响。经历20次热循环氧化实验后,测得陶瓷涂层内残余应力由初始压缩应力值(-30~-20 MPa)逐渐变化到(-15~15 MPa),与文献[3~7]结果比较一致。最后,用扫描电镜观察了试样截面形貌的变化。     

零相关区序列的交织构造

用交织方法研究ZCZ序列集合的构造，提出了基于交织技术的ZCZ序列构造的新方法．对于给定的周期为L的最佳自相关序列a和正交矩阵峨，首先选择合适的移位序列，对序列a进行交织得到（L，N）-交织序列b；再用正交矩阵HN将交织序列b扩展为新的序列集，则该序列集就是所构造的ZCZ序列集．用该方法可以构造达到或接近理论界的具有大的零相关区的ZCZ序列集，并统一了三元、四相和多相ZCZ序列集构造方法。     

机场道面温度应力的试验研究

通过对某机场水泥砼道面温度场和温度应变的现场实测 ,在此基础上提出了水泥砼机场道面温度场和温度应变场的变化规律 ,最后采用理论分析计算与实测温度应力 (应变 )进行比较 ,以验证理论计算的正确性