TSI和TDM一体化系统在汽轮机故障诊断中的应用实例

本文介绍了汽轮机监视装置和瞬态数据管理一体化系统在某发电厂300MW等级汽轮机上运行中，几个典型故障的诊断实例。     

基于TSI568的RapidIO交换模块设计

RapidIO互连构架是一个开放的标准,可应用于连接多处理器、存储器和通用计算平台.本文简要介绍了基于Tundra公司T5I568芯片的RapidIO交换模块的设计原理和实现方法,并对一些关键技术进行介绍.     

激光热喷涂Co30Cr8W1.6C3Ni1.4Si涂层在PAO+2.5%MoDTC油中摩擦学特性

为了提高TC4合金的耐磨性能,采用激光热喷涂技术在其表面制备了Co₃₀Cr₈W_1.6C₃Ni_1.4Si涂层。通过扫描电子显微镜（SEM）和X射线衍射（XRD）分析了涂层的形貌和物相,并通过摩擦磨损实验研究了涂层在PAO+2.5% MoDTC（质量分数）油中的磨损行为。结果表明,激光热喷涂的Co₃₀Cr₈W_1.6C₃Ni_1.4Si涂层主要由Ti、WC_1-x、CoO、Co₂Ti₄O和CoAl相组成,在涂层界面形成冶金结合。在激光功率为1000、1200和1400 W时所制备的涂层平均摩擦因数分别为0.151、0.120和0.171,其对应的磨损率分别为1.17×10^-6、1.33×10^-6和2.80×10^-6 mm³?N^-1?m^-1,磨损机理为磨粒磨损,其枝晶尺寸对降磨起主要作用。     

MMS6000系统在华能辛店发电厂200MW机组改造中的应用

结合华能辛店发电厂200MW机组汽轮机监视仪表系统(TSI)改造的情况,介绍了MMS 6O0O系统的配置及系统特点,对TSI改造中遇到的问题及解决方法进行了总结和分析。     

DPDAP－H_2O_2－HRP显色光度法测定HRP的研究

首次提出了Ｎ，Ｎ－二氯二甲基对苯二胺一Ｈ２Ｏ２－ＨＲＰ光度法测定ＨＲＰ的方法。ＨＲＰ催化Ｈ２Ｏ２氧化Ｎ，Ｎ－二氯二甲基对苯二胺生成有色化合物，通过测定有色化合物在λｍａｘ＝５５３．６ｎｍ处的吸光光度值，间接测定ＨＲＰ的含量。在所选定的实验条件下，ＨＲＰ的线性范围为１．０×１０－１０～１．０×１０－８ｇ／ｍＬ，本法用于游离ＨＲＰ的测定，与经典的ＥＬＩＳＡ显色光度法相比，灵敏度提高了一个数量级。ＨＲＰ的检测限为５．１×１０－１１ｇ／ｍＬ。     

J2EE平台上消息驱动Bean对客户的响应与回传的实现

EJB是基于Java的服务器端组件架构技术,借助于EJB,开发者能够轻松构建企业的、分布式组件应用,并且能够开发架构灵活、运行可靠及安全的应用系统.在EJB规范中,客户可向中间件发送消息,而消息驱动Bean(MDB)能从中间件接收消息,从而客户与消息驱动Bean实现异步传输消息,形成松耦合的状态.介绍了消息发布客户与消息驱动Bean通过服务器互传消息的理论,给出了Java消息服务的请求/响应解决方案,并且在J2EE1.4平台上实现了消息驱动Bean将响应结果异步回传给生产消息的客户,而客户可以是应用程序,Servlet/JSP,或EJB本身.     

Spectroscopic and HPLC Studies of Photodegradation of Nilvadipine

Photochemical decomposition of nilvadipine (NV), a derivative of 1,4-dihydropyridine (DHP), was studied. Photodegradation was carried out in the conditions recommended in the first version of the document issued by the International Conference on Harmonization (ICH), currently in force in the studies of photochemical stability of drugs and therapeutic substances. Methanol solutions of NV were irradiated with a high-pressure mercury arc lamp, type HBO 200 (300–400 nm). The maximum absorption of radiation at 365 nm was achieved by applying the interference filter and Wood's filter. The assessment of NV photodegradation was made on the basis of the UV spectrophotometric and high-performance liquid chromatographic (HPLC) methods. Quantitatively, the process was described with the calculated rate constants of decomposition k, time of decomposition of 50% of the compound t_0.5, and time of decomposition of 10% of the compound t_0.1. The two methods applied allowed a determination of the kinetic parameters of NV photodegradation from the relationship ln c = f(t). Using the Reinecke salt as a chemical actinometer, apparent quantum yields of photodegradation were obtained; after extrapolation to the time of irradiation zero, these gave the actual quantum yield (Φ = 7.3 · 10^?5). The quantum yield of fluorescence at λ_exc = 375 nm was about 9.3 · 10^?4. The methods used for evaluation of NV photodegradation were subjected to validation, and results of the analytical methods were statistically assessed by Snedecor F and Student t tests. The former test revealed no statistically significant difference between the variances obtained by the HPLC and UV spectrophotometric methods. Also, verification of the zero hypothesis of the Student t test on equality of means of the results obtained gave no significant differences between the two methods.     

Magnetic and Superconducting Properties of RuSr2Sm1.4Ce0.6Cu2O10−δ Samples

Samples with nominal composition RuSr₂Sm_1.4Ce_0.6Cu₂O_10−δ were synthesized at different conditions and their magnetic and superconducting properties were investigated. It was established that the magnetic order is of a long range type. It was shown that the increase of the oxygen content and the presence of larger microcrystals enhance the temperature of the onset of diamagnetism and the diamagnetic volume fraction of the samples, but do not significantly affect the temperatures of the intragrain superconducting and ferromagnetic transitions.     

On the chemical kinetics of cyclopentadiene oxidation

The cyclopentadiene/cyclopentadienyl system forms a critical part in the oxidation chemistry of aromatic fuel components used in surrogate fuels and the importance of the cyclopentadienyl radical in poly-aromatic hydrocarbon (PAH) growth has also been noted due to its site dependent reactivity. The latter aspect has been subject to a number of studies along with the initial pyrolysis steps. By contrast, few studies have been performed of the corresponding oxidation chemistry under conditions of relevance to combustion applications. Thermochemical data for oxidation reactions featuring the cyclopentadienyl radical with O, OH, HO₂ and O₂ were determined at the G3B3 and G4/G4MP2 levels in combination with an analysis of internal rotations using density functional theory and with the Jahn–Teller effect treated as a pseudo-rotation. The calculated potential energy surfaces were subsequently used in a consistent manner for the determination of pressure dependent reaction rate parameters through the Rice–Ramsperger–Kassel–Marcus/master-equation approach with Eckart quantum tunnelling corrections applied to reactions involving hydrogen transfers. The accuracy of the method was further investigated by comparisons of computed rate parameters for pyrolysis reactions with alternative determinations. The resulting chemistry was incorporated into an evaluation framework for the study of cyclopentadiene oxidation using recent experimental flow reactor data and principal uncertainties in reaction pathways assessed.     

NASICON型Na~+交换材料的制备、表征与性能研究

采用高温固相两步法制备了两种Li1.4M0.4Ti1.6(PO4)3(M=Al、Cr)系列NASICON功能材料,对不同掺杂合成的样品进行了XRD和SEM表征,并分别对其Na+的交换吸附容量进行了测定。结果表明,对LiTi2(PO4)3掺入适量的Al3+和Cr3+后未改变其晶体结构,合成的吸附剂粒径分布在5~10μm;Li1.4M0.4Ti1.6(PO4)3(M=Al、Cr)对Na+有特效吸附作用,当pH=11.0时,Li1.4Al0.2Cr0.2Ti1.6(PO4)3的饱和交换吸附容量可达69.26mg/g。