Differences between internal and external hydrogen effects on slow strain rate tensile test of iron-based superalloy A286

To investigate the evaluation method of hydrogen compatibility of A286 superalloy in high pressure hydrogen gas, SSRT tests of hydrogen-charged specimens were conducted at ambient temperature at various strain rates. The relative reduction in area (RRA), one of the ductility parameters, was determined. The hydrogen content in the hydrogen-charged specimen was the same as the equilibrium hydrogen content on the specimen surface at 150 °C in 70 MPa hydrogen gas. The strain rate dependence of RRA was smaller than that of RRA obtained in 70 MPa hydrogen gas at 150 °C. All the hydrogen-charged specimens showed slip-plane fractures in the grains in their cores. However, the specimens in 70 MPa hydrogen gas at 150 °C showed fracture surfaces morphology ranging from dimples to quasi-cleavages and intergranular fractures with decreasing strain rate. These dissimilarities are expected to arise from differences in the hydrogen concentration behaviors of the specimens during the deformation process.     

电网电压故障下向无源网络供电的MMC电力电子变压器的控制策略

电力电子变压器(PET)具有瞬时功率调节、谐波抑制等优点,输电线路经过PET向无源网络供电是柔性输电的一个重要应用领域.将模块化多电平变换器(MMC)技术与PET相结合,使得PET应用于高电压、大容量的输电和配电系统成为了可能.首先,本文针对MMC-PET输入级在电网故障时产生的正负序电流,推导出基于欧拉-拉格朗日(E...     

Optimisation of solar-hydrogen power system for household applications

A numerical method was developed for optimising solar–hydrogen energy system to supply renewable energy for typical household connected with the grid. The considered case study involved household located in Diyala Governorate, Iraq. The solar–hydrogen energy system was designed to meet the desired electrical load and increase the renewable energy fraction using optimum fuel cell capacity. The simulation process was conducted by MATLAB based on the experimental data for electrical load, solar radiation and ambient temperature at a 1-min time-step resolution. Results demonstrated that the optimum fuel cell capacity was approximately 2.25 kW at 1.8 kW photovoltaic power system based on the average of the daily energy consumption of 6.8 kWh. The yearly renewable energy fraction increased from 31.82% to 95.82% due to the integration of the photovoltaic system with a 2.25 kW fuel cell used as a robust energy storage unit. In addition, the energy supply, which is the economic aspect for the optimum system, levelised electricity cost by approximately $0.195/kWh. The obtained results showed that the proposed numerical analysis methodology offers a distinctive property that can be used effectively to optimise hybrid renewable energy systems.     

哈锅660MW高效超超临界循环流化床锅炉方案研究

在传统能源的清洁高效开发、转化、利用为主要发展的趋势下,更低供电煤耗和超低污染物排放将是火电机组未来发展方向,开发更高蒸汽参数的循环流化床锅炉是流化床技术发展的客观需求.本文论述了哈锅开发的660MW高效超超临界循环流化床锅炉的技术路线和技术方案,重点对锅炉的炉型选择、布置特点、系统配置、以及水动力、外置床、循环回路均...     

SHVC中帧内预测快速算法的研究

可分级高效视频编码(SHVC)可实现对视频序列的分层编码,正是因为实现了分层编码,编码的时间复杂度也会大大增加,尤其是在帧内预测过程中,需要从35种模式中通过率失真优化(RDO)选出最佳预测模式。为了加速增强层(EL)帧内预测模式的决策进程,基于当前预测单元(PU)与基本层(BL)相同位置PU,以及与BL中相同位置或EL中当前PU空间上相邻的PU的帧内预测模式的相关性,提出帧内预测模式快速决策算法。实验结果表明:在保证视频质量基本不变的情况下,相比较于SHVC的标准SHM-9.0而言,能减少大约40%~50%的时间。     

Effect of Substrate Temperature on Electroluminescence of SrS:HoF3 Thin Film

The SrS:HoF3 Electroluminescent (EL) thin films are prepared at the different substrate temperature by electron beam evaporation. The crystallinity and EL characteristics of the samples are analyzed. It is found that the main diffraction peak is (200) at the higher substrate temperature and the main diffraction peak is (111) at the lower substrate temperature. The blue emission intensity and EL brightness of the SrS∶HoF3 thin films increase with the increase of the substrate temperature. Annealing the samples can change the cyrstal phase and strengthen the blue emission of EL thin film.     

临机加热疏水系统的简化改进分析

为解决临机加热系统复杂和推广困难的问题,对临机加热系统的改进方法进行研究。以660 MW超超临界机组临机加热系统实际运行数据为基础,提出通过取消疏水系统简化临机加热系统的改造方法,并对其进行能耗及技术经济分析。研究表明:临机加热系统取消2号高压加热器至除氧器的正常疏水系统可以使系统大幅简化,示例机组投资减少约48%,能耗提高约7%～14%;示例机组在标煤单价800元/t、全年系统投入运行20次条件下,正常疏水系统的投资回收年限为23.63 a;总体来看,简化系统是一种更为经济可行的系统型式。     

有机电致发光屏显示模块研究

通过对有机电致发光器件的结构以及发光机理的分析，介绍了一种以内藏式图形控制器T6963C为主控制芯片的0LED显示模块，并给出了该显示模块与单片机的接口以及软件控制流程。     

Fabrication and performance characteristics of black‐dielectric electroluminescent 160 × 80‐pixel displays

Abstract— We report on recent technological progress in black‐dielectric electroluminescent (BDEL) displays. Fabrication of the first monochrome BDEL 160 × 80‐pixel 4‐in. displays driven with commercial low‐power (<5 W) drive circuitry is presented. Preliminary results on blue‐dielectric EL full‐color displays are also reported. Improvements in both BDEL display performance and display manufacturability underscore the recent development path.     

炼铁生产环境负荷分析和预测研究

利用寿命周期评价的思想，计算了炼铁生产过程中的环境负荷，并分析了各因素对环境负荷的影响，运用神经网络对炼铁生产过程环境负荷进行了预测。