济钢1 750 m3高炉薄壁炉衬操作技术

济钢1750m^3高炉采用砖壁合一的薄壁内衬结构。针对薄壁内衬高炉的技术特点，通过采取加强原燃料质量管理、重视上下部调剂、优化布料矩阵、控制合理的煤气流分布、完善冷却体系管理、控制合理操作炉型、狠抓设备点检等措施，高炉各项技术指标明显改善。     

HEMA共聚物水凝胶中水的存在状态

用过氧化二苯甲酰(BPO)作为引发剂，合成了N-乙烯基吡咯烷酮(NVP)／甲基丙烯酸β-羟乙酯(HEMA)和NVP/HEMA／甲基丙烯酸甲酯(MMA)共聚物水凝胶，用差热扫描量热法(DSC)和热重法(TG)对这些亲水凝胶中吸附水的状态进行了研究．结果表明，水凝胶中水的状态大致可分为自由水、可冻结的结合水和非冻结的结合水．不同用量的MMA与NVP和HEMA共聚，溶胀度不同，其吸附水中不同状态水的含量也有所差异，结果表明，随着MMA含量的增加，水凝胶中非冻结结合水的含量也增加。     

Applications of Thermoelectric Power Measurement to Deterioration Diagnosis of Nuclear Material and Its Principle

In order to non-destructively evaluate changes in toughness of cast duplex stainless steel, which is frequently used in main coolant pipes of PWR type nuclear power plants, due to thermal aging, we tried to apply thermoelectric power (TEP) measurement. because TEP is sensitive to microstructural material changes, and to clarify the mechanism behind TEP changes due to thermal aging. As a result, TEP of cast duplex stainless steel increased with aging time, and good correlations were found between TEP and toughness. Concerning the mechanism, TEP of high and low Cr content alloys was higher than that of intermediate Cr content alloys. Because high and low Cr areas are created in the ferrite phase due to thermal aging. TEP of the entire material increased. Furthermore, when each Cr fluctuating area acted in parallel, the increase in TEP became larger. According to the Mott-Jones theory, TEP is largely related to the electron density of states at the Fermi level. The electron density of states of Fe–Cr–Ni alloys in the valence band was measured with X-ray photoelectron spectroscopy (XPS). As a result, there was a high correlation between the TEP calculated from the XPS spectrum and the measured TEP. Therefore, we showed experimentally that the electron density of states changed due to variations in Cr concentration, which also affect TEP.     

Viscosity of Gaseous Mixtures of HFC-134a (1,1,1,2-Tetrafluoroethane)+HFC-32 (Difluoromethane)

This paper reports experimental results for the viscosity of gaseous mixtures of HFC-134a (1,1,1,2-tetrafluoroethane)+HFC-32 (difluoromethane). The measurements were carried out with an oscillating-disk viscometer of the Maxwell type at temperatures from 298.15 to 423.15 K. The viscosity was measured for three mixtures containing 25.00, 52.40, and 74.98 mole% HFC-134a in HFC-32. Experimental results for the viscosity at normal pressures show a minimum as plotted against mole fraction in the higher temperature region, which may be the first experimental observation of the minima for dilute binary gaseous mixtures of HFCs. The viscosity at normal pressures was analyzed with the extended law of corresponding states developed by Kestin et al., and the scaling parameters were obtained for unlike-pair interactions between HFC-32 and HFC-134a. The modified Enskog theory developed by Vesovic and Wakeham was applied to predict the viscosity for the binary gaseous mixtures under pressure. As for the calculation of pseudo-radial distribution functions in mixtures, a method based on the equation of state for hard-sphere fluid mixtures proposed by Carnahan–Starling was applied.     

钮扣用黄铜带退火工艺探讨

用于制造高质量钮扣的黄铜带生产工艺较为复杂，由于大多数铜加工厂设备所限，产品批量生产性能不     

安钢5″300m^3高炉大料钟拉杆弯曲变形事故分析与处理

针对安钢哺5#300m3高炉大料钟拉杆弯曲变形,导致大钟关闭不严、炉顶压力波动大,严重影响高炉炉况顺行的实际情况,分析了大料钟拉杆发生弯曲变形的原因,探讨了快速更换拉杆的可行性方案.     

快速更换大钟吊杆和拉杆的措施

液压炉顶大钟吊杆和拉杆出现弯曲会影响大钟和大钟斗的密封 ,从而影响高炉的稳定顺行。结合安钢 6# 高炉大钟吊杆和拉杆弯曲后的实例检修 ,旨在说明在日常检修中可以实现快速更换大钟吊杆和拉杆 ,并提出在快速更换过程中的注意事项     

Global output-feedback stabilization for a class of uncertain time-varying nonlinear systems

This paper investigates the global output-feedback stabilization for a class of uncertain time-varying nonlinear systems. The remarkable structure of the systems is the presence of uncertain control coefficients and unmeasured states dependent growth whose rate is inherently time-varying and of unknown polynomial-of-output, and consequently the systems have heavy nonlinearities, serious uncertainties/unknowns and serious time-variations. This forces us to explore a time-varying plus adaptive methodology to realize the task of output-feedback stabilization, rather than a purely adaptive one. Detailedly, based on a time-varying observer and transformation, an output-feedback controller is designed by skillfully combining adaptive technique, time-varying technique and well-known backstepping method. It is shown that, with the appropriate choice of the design parameters/functions, all the signals of the closed-loop system are bounded, and furthermore, the original system states globally converge to zero. It is worth mentioning that, the heavy nonlinearities are compensated by an updating law, while the serious unknowns and time-variations are compensated by a time-varying function. The designed controller is still valid when the system has an additive input disturbance which, essentially different from those studied previously, may not be periodic or bounded by any known constant.     

Energetic distribution of interface states extracted from photo-conductance of organic thin film transistors

In this paper, a new method is introduced to obtain the energetic distribution of the interface states (density of states; DOS) extracted from the photo-conductance of organic thin film transistors (OTFTs) which exhibit varied transfer characteristics under illumination with different photon energies. The method was applied to pentacene OTFTs, and the results were compared with existing data. The major findings were not only the existence of the well-known peaks of DOS at 1.82 eV (free exciton of pentacene), and at 1.49 eV (extrinsic exciton due to dihydropentacene) but also new peaks were found at 1.25 eV, 1.29 eV, 1.31 eV, and 1.35 eV in the mid-gap. The new peaks were strongly enhanced under exposure to oxygen, and thus seem to be related to the defects associated with the presence of oxygen.