荧光法测定茶叶铝含量及不确定度评定

铝在一定条件下对苯基荧光酮的自体荧光有显著的猝灭作用,由此建立了测定铝含量的方法。同时,对该体系进行了方法不确定度评定,计算出该方法扩展不确定度up为24μg·g-1,茶叶中铝含量为(277±24)μg·g-1。     

A Self-Adapting and Efficient Dandelion Algorithm and Its Application to Feature Selection for Credit Card Fraud Detection

A dandelion algorithm (DA) is a recently developed intelligent optimization algorithm for function optimization problems. Many of its parameters need to be set by experience in DA, which might not be appropriate for all optimization problems. A self-adapting and efficient dandelion algorithm is proposed in this work to lower the number of DA’s parameters and simplify DA’s structure. Only the normal sowing operator is retained; while the other operators are discarded. An adaptive seeding radius strategy is designed for the core dandelion. The results show that the proposed algorithm achieves better performance on the standard test functions with less time consumption than its competitive peers. In addition, the proposed algorithm is applied to feature selection for credit card fraud detection (CCFD), and the results indicate that it can obtain higher classification and detection performance than the-state-of-the-art methods.

     

储层裂缝的观测内容和探测方法

针对储层裂缝研究中存在的欠缺多学科结合的现状,总结归纳了裂缝观察内容和探测方法。综述了利用露头、岩心资料来研究裂缝和利用生产动态资料、测井以及地震资料探测裂缝的方法原理,并比较了各种资料的优缺点。提出了开展储层裂缝研究应注意综合多个学科,应用多种手段的思想,主张以区域地质背景研究为出发点,发挥各种资料的优势,开展从点线面到体的全方位裂缝预测研究。开展裂缝研究对于寻找裂缝性油气藏具有一定的指导意义。     

非晶态Ni-P合金在碱性介质中的阳极行为

用动电位极化方法研究了3种不同化学镀工艺得到的Ni-P非晶态合金镀层,在1mol/1NaOH碱性介质中的阳极极化行为,并通过XPS分析了不同极化电位下的表面膜.结果表明:在所研究的体系中不存在随P增加阳极溶解电流下降的规律;尽管合金表面存在H₂PO₂^-和PO₄^-离子,但并没有有效地抑制Ni-P合金的阳极溶解。P的强烈的水化作用可能是导致非晶态Ni-P合金的阳极溶解电流比纯Ni更大的主要原因。     

新型电流型变频调速装置——GTO'S应用之三

研制采用 1支 GTO'S和 6支SCR组成的1种新型变频调速装置。用来控制逆变器中的SCR 换向时刻,并在交流输出端并联3个电容器,其作用是为了提供换向条件,吸收过电压尖峰和减少输出电流的谐波。用变频调速装置拖动2 kW感应电动机,测定电动机的电压和电流波形。通过与普通电流型变频调速装置的电机电压和电流波形相比较,该装置适用于风机或泵类负载的交流调速装置。     

Scheduling Dual-Arm Multi-Cluster Tools With Regulation of Post-Processing Time

As wafer circuit width shrinks down to less than ten nanometers in recent years, stringent quality control in the wafer manufacturing process is increasingly important. Thanks to the coupling of neighboring cluster tools and coordination of multiple robots in a multi-cluster tool, wafer production scheduling becomes rather complicated. After a wafer is processed, due to high-temperature chemical reactions in a chamber, the robot should be controlled to take it out of the processing chamber at the right time. In order to ensure the uniformity of integrated circuits on wafers, it is highly desirable to make the differences in wafer post-processing time among the individual tools in a multi-cluster tool as small as possible. To achieve this goal, for the first time, this work aims to find an optimal schedule for a dual-arm multi-cluster tool to regulate the wafer post-processing time. To do so, we propose polynomial-time algorithms to find an optimal schedule, which can achieve the highest throughput, and minimize the total post-processing time of the processing steps. We propose a linear program model and another algorithm to balance the differences in the post-processing time between any pair of adjacent cluster tools. Two industrial examples are given to illustrate the application and effectiveness of the proposed method.

     

电渣铸铁—现状和展望

六十年代末,七十年代初,苏联冶金学者开始了电渣铸铁的研究工作。电渣重熔和电渣精炼过程的脱硫,脱磷、除夹杂、除气等作用对获得优质铁水,提高铸件质量有明显效果。特别是在直流制度下熔炼,有可能发挥电化学作用。有目的地从熔体中排除有害元素或从熔渣中获得合金化元素,因此,试图采用电渣重熔或电渣精炼进行变性处理和合金化取代添加球化剂直接得到球墨铸铁的生产技术引起人们极大的兴趣。
虽然电渣铸铁工艺和生产技术本身尚有改进的方面,而且对某些基本理论的研究仍处于探讨阶段。然而,作为一种铸铁精炼的新方法,有可能从根本上改革现行的生产工艺。
本文收集了十多年来有关电渣铸铁的文献资料,概括了国外有关电渣生铁熔炼的研究内容和成果。结合我国资源条件及工业发展特点,对开展电渣铸铁工艺和理论研究工作提出一些建议。