复合板爆炸焊接参数计算窗口开发

系统地梳理了爆炸焊接中静态参数、动态参数之间相互关系.针对爆炸焊接工艺参数多、经验计算公式复杂、计算过程逻辑复杂、人工计算易出错的困难,利用Visual Basic软件进行编程,开发适合双金属爆炸焊接参数选择系统,以方便工业生产中双金属复合板爆炸焊接参数选择.所开发的系统建立了异质金属材料性能数据库,可实现任意异质或同...     

Effects of temperature on creepage discharge characteristics in oil-impregnated pressboard insulation under combined AC–DC voltage

Due to the complexity of the valve side winding voltage of the converter transformer, the insulation characteristics of the oil-impregnated pressboard (OIP) of the converter transformer are different from those of the traditional AC transformer. The study on effect of temperature on the creeping discharge characteristics of OIP under combined AC–DC voltage is seriously inadequate. Therefore, this paper investigates the characteristics of OIP creepage discharge under combined AC–DC voltage and discusses the influence of temperature on creepage discharge characteristics under different temperatures from 70°C to 110 °C. The experimental results show that the partial discharge inception voltage and flashover voltage decrease with increasing temperature. The times of low amplitude discharge (LAD) decrease and amplitude of LAD increases. Simultaneously, the times of high amplitude discharge (HAD) gradually increase at each stage of creepage discharge with higher temperature. The analysis indicates that the charge carriers easily accumulate and quickly migrate directional movement along the electric field ahead of discharging. The residual charge carriers are more easily dissipated after discharging. The ‘hump’ region of LAD moves to the direction of higher discharge magnitude. The interval time between two continuous discharges is shortened obviously. The concentration of HAD accelerates the development of OIP insulation creepage discharge. The temperature had an accelerating effect on the development of discharge in the OIP under applying voltage.     

结晶器铜板寿命的优化使用

通过几年的观察研究，总结出影响结晶器铜板寿命的几个主要因素，铜板磨损、镀层裂纹、铜板裂纹。并对问题产生的原因进行分析，制定出措施。     

太阳能技术的研究综述

新能源技术是当今世界备受关注的五大技术领域之一,作为新能源技术的中坚力量-太阳能利用技术更是受到越来越多研究者的青睐,本文主要介绍太阳能在我国的分布情况及利用技术的研究进展。     

浅析导管失效原因与预防措施

本文论述了造成导管失效的原因，分析导管加工、安装应该注意事项，提出了预防措施。     

低能耗太阳能采暖建筑实践

通过两种途径降低建筑能耗,其一是进行优化设计,采用节能性能良好的建筑材料建成节能建筑,降低建筑物自身的耗热量指标;其二是应用太阳能热水采暖系统,用可再生能源进一步降低建筑物一次能源的消耗量。     

台山EPR核电站钢筋施工管理

台山EPR核电站核岛土建施工中钢筋分项工程量巨大,涉及各种结构构件。通过采取合理的施工顺序和绑扎方法,依据合理的技术要求等一系列措施,对钢筋分项进行总体施工管理,以保证钢筋分项的工程质量和施工进度。     

钛铁矿机械活化-稀酸酸解反应耦合

采用稀酸酸解反应工艺,利用机械活化-稀酸酸解反应耦合技术,在磁驱转动的球磨反应装置上进行了钛铁矿的酸解反应。考察了反应器旋转速率、酸矿比、球料比及硫酸浓度等对酸解反应的影响。结果表明,在硫酸质量分数为60%、酸矿比1.6:1、球料比10:1及反应温度90℃条件下,与原矿浸出反应空白实验相比,采用活化-浸出耦合反应的浸出速率明显提高,浸出2 h酸解率从32%提高到49%,所得钛液的稳定性大于450 mL。扫描电镜(SEM)及X射线衍射(XRD)表征结果表明,耦合反应使得矿物颗粒不断破碎、细化和脱落,使剩余未活化芯继续活化并不断反应浸出。