全氢罩式退火炉退火热过程的研究(Ⅱ)——对流换热系数和钢卷径向等效导热系数的分析

介绍影响全氢罩式退火炉内换热的两个重要参数——对流换热系数和钢卷径向等效导热系数,详尽分析了两个参数的影响因素,并对比了氮气和氢气气氛下两参数的不同,从而在机理上阐明了全氢罩式炉相对传统混氢罩式炉的优越性,为优化炉内换热提供了理论的依据.     

Tuning the pinning direction of giant magnetoresistive sensor by post annealing process

The Internet of Things has created an increasing demand for giant magnetoresistive (GMR)sensor owing to its high sensitivity,low power-consumption and small siz...     

Interactions between hotspots and the Southwest Indian Ridge during the last 90 Ma:Implications on the formation of oceanic plateaus and intra-plate seamounts

This study investigates the relationship between the hotspot-ridge interaction and the formation of oceanic plateaus and seamounts in the Southwest Indian Ocean.We first calculated the relative distance between the Southwest Indian Ridge (SWIR) and relevant hotspots on the basis of models of plate reconstruction,and then calculated the corresponding excess magmatic anomalies of the hotspots on the basis of residual bathymetry and Airy isostasy.The results reveal that the activities of the Marion hotspot can...     

改进新息图法在地区电网AVC系统中的应用

新息图法对于坏数据、拓扑变化的辨识有着显著效果.文中针对地区电网的辐射特性,提出了新息图法的分层辨识,建立了厂站层和联络线层新息图模型.当连支出现坏数据时,采用伪量测对其进行修正,避免了传统方法更换连支后需重新生成树的不足;支路预估值的准确程度将影响新息值的准确性,对此利用自动电压控制(AVC)系统潮流验证模块k时刻的在线潮流计算值与测量值的差值△P,按系数a对k+1时刻支路预估值进行趋近补偿,补偿后的潮流推算曲线更接近真值,提高了拓扑变化辨识的准确性.将以上改进的新息图法应用于四川省多个地区电网AVC系统,运行效果良好,能准确辨识坏数据和拓扑变化.     

高速动车组网侧电流谐波特性的研究

研究了高速动车组注入牵引网电流的谐波特性。分析了两电平及三电平4象限变流器的主电路拓扑及控制策略。利用双边傅立叶级数法,给出了两种4象限变流器网侧电流的谐波公式,总结了谐波分布规律。编制了CRH2和CRH5型动车组4象限变流器的仿真软件,研究了不同牵引和制动功率下,网侧电流的THD及各次谐波电流大小,验证了理论分析的正确性。     

电能质量及谐波测控技术与应用

电能作为现有最清洁的能源之一,电力部门对其输送的实时质量测控及电网谐波的防治高度重视.本文就电力系统电能质量的突变成因、评价指标、自动调节、测控技术与应用等方面进行论述,仅供同行们参考.     

Conceptual models for fracturing in fault related folds

Fault related folds and fractures, which always improve reservoirs and trap capacity, especially in the oil and gas fields in western China, are of extreme importance for oil and gas exploration. Based on four assumptions and fault related fold theory, we propose four conceptual models for fracturing in fault related folds, i.e., a simple-step parallel fault bend anticline, a simple-step parallel fault propagation anticline, a multiple-bend fault-bend fold and a break-forward imbricate. Fracture conditions depend on structural evolution and specific site conditions. A case study of the Kulongshan Anticline in the Jiuquan Basin shows that our conceptual models match reality data very well.     

3PE防腐技术在洞头引水工程中的应用

长距离、中大口径的城市输水管道是供水系统的关键环节,管道外防腐技术的选择至关重要.温州洞头引水一期工程(包括陆地段和跨海段)供水线路长,覆盖范围大,管线路由情况复杂,为确保管线运行安全,管道外防腐采用挤压聚乙烯防腐层三层结构(即3PE)加强级.以该工程为例,重点介绍三层PE防腐蚀技术的应用参数及技术要点,并说明了施工过程中需注意的几个问题.