基于RPC机制的容错计费系统的设计与实现

网络计费管理是商业化计算机网络的重要网络管理功能.随着Internet商业化进程的推进和企业Intranet的广泛发展与应用,人们对网络计费管理的需求越来越迫切.对计费系统的一个基本要求就是高效、可靠.文章提出了一个基于RPC通信机制的容错计费系统FTCharge(fault-tolerant charge).在简述了计费的基本依据和原理以后,着重论述了FTCharge的总体结构和多容错机制的实现.     

UNIX网络程序的RPC设计与实现

文章对基于ＴＣＰ／ＩＰ的ＵＮＩＸ系统中的ＲＰＣ机构进行了深入探讨,对客户方和服务器方的桩模块,ＸＤＲ转换、Ｐｏｒｔｍａｐｐｅｒ进程的功能等进行了分析,并结合具体实例实现了ＲＰＣ。     

基于网络的自动测试系统的研究

论述了网络环境下实现可程控仪器间的通讯及实现这一通讯方式的网络测试系统的基本构成和接口部件——网络仪器服务器的用法,并描述了网络仪器协议的参考模型及其RPC。     

大跨度预应力活性粉末混凝土双向简支板的设计与计算

介绍新型建筑材料活性粉末混凝土的力学性能,根据现有规范对大跨度预应力双向简支板进行后张法设计与计算。计算过程包括对预应力钢筋估算、预应力损失、截面复核和挠度验算几个部分,并结合有限元分析软件ANSYS对双向板进行有限元分析计算,从而比较两种计算方法,得出结论。     

Influence of RPC Parameters on the Precipitation of Nb in Microalloyed Steel

Thermo-simulation test, metallographic analysis, measurement of hardness, TEM(including diffraction contrast technique and nano-beam anylasis)along with calculating software of Metlab, etc. were used to study the influence of RPC parameters(relaxation time, aging time)on the precipitation of Nb in microalloyed steel. Following work was undertaken in this study:Strain-induced precipitation in Nb-bearing multi-microalloyed steel was monitered and analyzed. The interaction between dislocation evolution and precipitates in deformed austenite was directly observed(an Fe-Ni-Nb alloy was employed to simulate austenite in steel). The(a low carbon microalloyed steel only by Nb was adopted)effect of relaxation of deformed austenite on aging behavior occurring in bainite was investigated. Finally, the thermal stability and variation of composition of carbonitride precipitates during dissolving process in Nb-Ti microalloyed steel were alsodetected. These results indicate:(1)During the stress relaxation, the process of precipitation happened in deformed austenite of multi-microalloyed steel can be divided into three stages, i. e. nucleation, growth and coarsening. In the final stage of relaxation, Mo atoms would enter the lattice of(Nb,Ti)(C,N)precipitates and its concentration in the precipitates increases with the relaxation time.(2)In the earlier stage of relaxation, the dislocations in deformed austenite demonstrate twisted and distribute randomly. The precipitates have the tendency to occur along those dispersed dislocations. The dilocation cells would form gradually with the relaxing time prolonged and would become more stable by the subsequent precipitates formed on them in the later relaxation period. The paralleled dislocations in dislocation cells exhibit the same Burgers vector. The dislocations get rid of pinning by the bypassing mechanism.(3)When the samples are reheated to hold isothermally at 525℃,which are relaxed for different time in deformed austenite followed by accelerated cooling, their microstructures evolve very slowly with the aging time but two hardness peaks can be found one each hardness-time curves. The position of hardness peaks nearly raimains unchanged while their height varies obviously with the relaxation time. In no relaxtion samples, only one hardness peak could be observed. During the process of aging at 525℃, The growth and coarsening of as-existed strain-induced precipitates formed in deformed austenite contribute to formation of the first hardness peaks. While the second hardness peaks result from the further precipitates which nucleate in a phase after γ→α transformation(after aging for about 10 hours).(4)It was found that the precipitates formed during solidification are monophase(Ti,Nb)(C.N)rather than TiN enclosed with NbC. With addition of Ti to the steel, the thermal stability of the carbonitrides would enhance remarkably.     

活性粉末混凝土高温后冲击力学性能研究

摘　要：利用分离式Hopkinson压杆系统,采用铅片作为整形器,分别对常温下、400℃、600℃及800℃高温过火后的RPC试样进行单轴冲击压缩实验。研究高温后钢纤维对RPC材料动态力学性能及吸能特性的影响规律。结果表明,高温过火前后钢纤维对RPC均有增强和增韧的作用。高温后因RPC塑性流动性能的增强,导致钢纤维的增韧作用减弱。RPC动态抗压强度高温后损失的速率高于韧性指标。分析RPC材料冲击压缩过程的能量机制,发现钢纤维提高了RPC的能量吸收率,因此能量吸收能力也得到了增强。利用SEM扫描电镜,从RPC材料微观结构变化的角度分析了其高温后宏观力学性能降低的原因。     

远程参数控制方法的摩托车道路模拟实验研究

通过实际道路试验,获得了摩托车车架关键部位的响应信号,经预处理并对测得信号进行了统计分析。利用美国MTS公司的道路模拟试验机和远程参数控制技术（RPC）模拟迭代出了接近实际响应的驱动信号,基本达到了在室内道路模拟机上直接模拟实际路况的要求。     

基于远程参数控制的DCT关键零部件道路模拟试验

为考核双离合自动变速器(DCT)中阀体、传感器和电子元件等关键零部件在实际道路冲击振动下的疲劳可靠性,基于远程参数控制(RPC)技术,结合美国MTS液压伺服激振器和控制系统,设计并搭建了DCT关键零部件道路模拟试验台。通过在关键零部件附近安装加速度传感器和应变片,结合某企业可靠性试验方法,在襄阳试车场采集了大量载荷谱,并对载荷谱进行了分析和反复模拟迭代,准确快速地再现了DCT关键零部件在襄阳试车场相应试验路段的振动特性,为考核DCT阀体、传感器及电子元件等关键零部件的疲劳可靠性提供了一种行之有效的方法。     

RPC混凝土梁施工工艺及验收标准研究

RPC混凝土梁在我国铁路桥梁结构中为新型结构,叙述了该种结构设计、施工、架设的要点,并结合实桥制作经验,提出了主要技术指标和设计参数,确定了施工工艺和验收标准,为新技术及材料推广提供了可靠的技术支撑。     

高温后不同聚丙烯纤维掺量活性粉末混凝土力学性能试验研究

完成了聚丙烯纤维(PPF)体积掺量分别为0、0.1%、0.2%和0.3%的活性粉末混凝土(RPC)经20~900℃后的力学性能试验,包括70.7 mm×70.7 mm×70.7 mm立方体受压试验、70.7 mm×70.7 mm×228.0 mm棱柱体受压试验、40 mm×40 mm×160 mm棱柱体受折试验和“8”字形试件轴心受拉试验。考察了PPF对RPC高温爆裂的抑制效果,分析了PPF掺量和经历温度对RPC高温后力学性能(残余立方体抗压强度、残余轴心抗压强度、残余抗折强度和残余轴心抗拉强度)的影响。结果表明：PPF体积掺量0.1%和0.2%时对RPC高温爆裂的抑制作用不明显,体积掺量0.3%时可以防止RPC发生爆裂;常温下PPF的掺入对RPC力学性能有不利影响,经历温度高于200℃时,随PPF掺量的增大高温后RPC力学性能相应提高;掺PPF的RPC高温后残余抗压强度、残余抗折强度和残余轴心抗拉强度均随经历温度的升高先增大后减小,3种强度的临界温度分别为300℃、300℃和120℃。根据试验统计数据建立了高温后PPF体积掺量不同的RPC残余抗压强度、残余抗折强度和残余轴心抗拉强度随温度变化的计算式。