On line fatiguemeter: a large experiment in French nuclear plants

During operation of PWR plants, thermal transients occur and induce fatigue stresses at critical locations in the nuclear steam supply system. Assessment of cumulative usage factor at these locations is one the major concerns regarding plant life extension.A system based on real time fatigue monitoring his been developed by EDF. The principle of the system, that records plant operating parameters and calculate thermohydraulic conditions, local stresses and usage factor resulting from each individual transient, is firstly presented.Demonstration experiments, concerning two higly stressed locations of reactor coolant system (charging line nozzle and surge line), carried out in two 900 MW units are then described.Finally, analysis of these experiment results is commented. The system allows automatic transients book keeping and usage factor assessment. EDF intends to equip all its PWR units with such fatigue monitoring systems.     

竖炉—铁浴熔融还原炼铁过程的系统模拟

本文着重对竖炉—铁浴熔融还原炼铁流程,建立了相应的软件系统,并进行了流程系统计算机模拟计算,考察了不同煤种、含碳球团的预还原度、铁浴炉渣碱度和二次燃烧率对系统的能量消耗和利用、热平衡及各项指标的影响,可为流程概念设计与评估及操作参数选择提供参数和依据。     

流态化—铁浴熔融还原流程的系统模化

对于以快速流态化床预还原和煤氧喷射铁浴终还原两项技术相结合为特征的熔融还原炼铁流程,作了流程系统计算机模化研究。建立了系统模化计算的通用程序软件,并对不同煤种、铁矿石组成、预还原矿金属化率、铁浴炉渣碱度、流程各段出口温度等参数条件下该流程及各反应器的能量利用,热平衡及物流量与组成等,作出了予报。其结果可为该类熔融还原流程的概念设计提供依据或参考,并有助于选择最佳的工艺操作参数。     

Modified spontaneous emission in oligo (p-phenylene vinylene) planar microcavities

This paper reports on the photoluminescence properties of phenylene vinylene oligomers films (OPV) the emission of which was modified by microcavity effect. Films with 4 and 6 vinyl groups (respectively denoted OPV-4 and OPV-6) were investigated. A strong blue luminescence at 470 nm is observed for OPV-4. OPV-6 shows an emission spectrum quite similar to that of poly phenylene vinylene (PPV). Photoluminescence excitation measurements (PLE) give similar behaviors for the two samples and do not show any change in the shape of the spectra. Ageing under UV irradiation (380 nm) of the unencapsulated OPV-4 layers was evidenced by an exponential decrease of the photoluminescence intensity of about 40% after 3 h a continuous illumination. OPV-6 samples, aged on shelf, for weeks does only show a small decrease (15%) of the PL level over more than 7 h under continuous UV irradiation. Microcavity related effects were observed by inserting the films between two mirrors. These are generally a TiO₂/SiO₂ distributed Bragg reflectors (DBR) as bottom mirror and a Ag film as top mirror. However best results were obtained with two dielectric DBR. As expected, a strong enhancement of the emission at the cavity resonance and pronounced angular effects (emission peaking in the direction normal to the surface of the device) were observed. The importance of the position of the emitting material within the microcavity is evidenced with a thin tris(8-hydroxy) quinoline aluminum (Alq) embedded in SiO₂ with various cavity configurations.     

防卡防泥包润滑剂RT－005的研究及应用

介绍了具有防卡防泥包双重性能的润滑剂ＲＴ－００５的研究过程和现场应用情况。经辽河油田２９０口并应用证明，ＲＴ－００５润滑剂具有很强的防卡润滑能力，而且大幅度地降低了钻井成本。     

非金属阻尼与挠性接管在管路减振中的作用

本文应用管路振动试验测试结论 ,证明在管路中非金属阻尼结构与挠性接管具有数量相当的减振效果。并在此基础之上对管路振动控制设计提出几点建议 ,希望能起到抛砖引玉的作用。     

Modified broadside-coupled microstrip lines suitable for MIC andMMIC applications and a new class of broadside-coupled band-pass filters

Modified broadside-coupled microstrip lines, suitable for microwave and millimeter-wave integrated and monolithic integrated circuit (MIC and MMIC) applications requiring wide bandwidths and tight couplings, are presented. Their analysis, based on the quasi-static spectral domain technique, is described. Using these broadside structures, a new class of broadside-coupled band-pass filters has been developed at X-band (8-12 GHz) with about 1-dB insertion loss. Fair agreement between the measured and calculated results has been observed even though a major approximation is used     

Immune cell entry to the CNS--a focus for immunoregulation of EAE

T-cell-derived cytokines are therefore individually unnecessary and collectively insufficient for microglial response. This somewhat provocative interpretation does not exclude a role for T-cell cytokines in induction of a microglial response in EAE, but it may be easier to show a non-requirement then to prove such a role. The point that emerges is that cytokine production in the CNS parenchyma is itself dependent on the prior infiltration of immune cells, and that without immune cell entry, EAE does not occur. This identifies events at the BBB, and in particular in the perivascular space, as critical immunoregulatory events in development and progression of EAE.