西门子计算机的服务处理机分析和故障诊断方法

本文介绍了西门子7570-C计算机服务处理机的特点、逻辑结构、硬件配置、软件系统和故障诊断方法。该文对从事西门子计算机和其他计算机系统的硬件维修人员将有所帮助。     

Fuel design real-time to control HCCI combustion

In order to achieve lower emissions and extensive load in the homogeneous charge com- pression ignition (HCCI) engine system, a novel fuel design concept that high-octane number fuel and high-cetane number fuel are mixed real-time to con- trol HCCI combustion is proposed in this study. HCCI combustion fueled with iso-octane/n-heptane mix- tures controlled real-time on a single-cylinder HCCI combustion engine is studied. The test results show that the equivalence ratio of n-heptane in mixtures decides ignition and controls the combustion phase of HCCI combustion. The addition of iso-octane ex- tends knocking limit in equivalence ratio somewhat, but knocking occurrence mainly depends on the total concentration of mixture. Although operating range in equivalence ratio becomes narrow with the increas- ing proportion of iso-octane, the maximum load of HCCI combustion fueled with iso-octane/n-heptane mixtures controlled real-time is increased about 80% more than that of pure n-heptane. When iso-octane/ n-heptane mixtures are controlled in optimized method, it is proved that the load of HCCI combustion can be fully extended and emissions can be de- creased remarkably, while at the same time the higher indicated thermal efficiencies are obtained over the extensive operation range.     

L^p（T，∑，μ）（p≥1）型空间单位球面间的等距的表现和延拓

给出了L^p型空间单位球面间的满等距表现定理，推广了关于l^p型空间的相应定理．作为简单推论证明了相关的等距延拓定理．     

Al（Ⅲ）—EGTA—PR—CPB显色体系的研究

在pH5.0-5.9的微酸性溶液中.铝(Al).乙二醇二乙醚二氨基四乙酸(EGTA)、邻苯三酚红(PR)和阳离子表面活性剂溴化十六烷基吡啶(CPB)迅速反应,形成一蓝色配位化合物,最大吸收波长于615nm处。该配位化合物的组成为Al(Ⅲ)∶EGTA∶PR∶CPB=1∶1∶3∶12,表观摩尔吸光系数为5.9×10~4dm~3·mol~(-1)·cm~(-1).25cm~3溶液中,0-8μg含量范围内的Al(Ⅲ)遵守比尔定律,17种常见离子和5种阴离子不干扰Al(Ⅲ)的测定。     

五氧化二锑和四溴苯酐协同阻燃性能

在阻燃剂各类物质中,锑系和卤素系阻燃剂应用广泛,因为二者具有较强的协同增强阻燃作用,大大降低阻燃剂的用量,同时又能保证聚合物的阻燃性能及其它化学、机械性能.四溴苯酐(TBPA),其溴含量很高(69.9%,wt),作为反应型阻燃剂,可制得透明,阻燃效果良好的不饱和聚酯树脂.胶体Sb_2O_5,粒径为0.01—0.03μm,无着     

Biosynthesis of selenosubtilisin: A novel way to target selenium into the active site of subtilisin

Glutathione peroxidase （GPx, EC1.11.1.9）, an important anti-oxidative selenoenzyme, can catalyze the reduction of harmful hydroperoxides with concomitant glutathione, thereby protecting cells and other biological issues against oxidative damage. It captures considerable interest in redesign of its function for either the mechanism study or the pharmacological development as an antioxidant. In order to develop a general strategy for specifically targeting and operating selenium in active sites of enzymes, the catalytically essential residue selenocysteine （Sec） was first successfully bioincorporated into the catalytic center of subtilisin by using an auxotrophic expression system. The studies of the catalytic activity and the steady-state kinetics demonstrated that selenosubtilisin is an excellent GPx-like biocatalyst. In comparison with the chemically modified method, biosynthesis exhibits obvious advantages： Sec could be site-directly incorporated into active sites of enzymes to overcome the non-specificity generated by chemical modification. This study provides an important strategy for specifically targeting and operating selenium in the active site of an enzyme.     

Hopf bifurcation and chaos of financial system on condition of specific combination of parameters*

Exponential stability of the first order singular distributed parameter systems is discussed in the light of degenerate semi-group methods, which is described by the abstract developing equation in Hilbert space. The necessary and sufficient conditions concerning the exponential stability of the first order singular distributed parameter systems are given.     

高速双通道A/D数据采集系统及其应用

针对大学物理实验中手动逐点测量数据的落后现状 ,设计了高速双通道数据采集系统 ,能实现在手动调节或自动扫描自变量的同时 ,由计算机自动记录自变量和函数的双通道电压数值 .其特点是利用 DMA(直接数据通道传送 )接口技术 ,充分发掘 A/ D转换芯片的固有高速性能 .本方法对大学物理实验手段的提高具有实用价值     

弱含水地层青山组火山岩地下水分布规律及解决缺水问题探讨

白垩系青山组火山岩是弱含水岩层,但在有利的岩性与构造的作用下,可以形成相对富水地段,通过物探固定小MN装置测深法与地质分析相结合,已打出一批好机井,从而解决了该区严重缺水问题。