煤基SN级5W-30汽油机油行车试验研究

行车试验是全面评价汽油机油（润滑油）性能的重要方法。分别对自研煤基5W-30汽油机油和市售SN 5W-30汽油机油进行10 000 km行车试验研究,依据国家标准GB/T 8028—2010《汽油机油换油指标》对不同行驶里程下的旧油进行理化性能分析。结果表明：10 000 km行车试验后,2种汽油机油性能指标均未超过换油指标要求,仍有较大性能余量;相比市售SN 5W-30汽油机,自研煤基汽油机油行车试验后铁含量和酸值增加更小,碱值余量更大,表现出更优异的润滑性能、抗氧化性能、抗磨损性能和清洁分散性能。     

Moments and points in an interval-based temporal logic

This paper develops and explores a first-order theory of time that appears useful as an underlying framework for a wide range of practical applications in artificial intelligence (AI). In particular, it presents a concise, formal axiomatization of "interval-based" time as described by Allen and then explores the relationship between interval-based and point-based temporal theories in detail. This analysis should be useful to both theoretical and practical work in AI that involves the representation of time, since it shows what distinctions are actually substantive and what arise merely from formalisms being notational variants of one another.     

周期自动换向金电解新工艺

自１９０８年以来，世界上进行金的电解精炼，大多采用沃耳维尔法。但由于沃耳维尔法的整流装置复杂、投资大，不适于中小矿山及首饰加工业采用。我们提出周期自动换向金电解新工艺，以代替沃耳维尔法，现已获得专利权。并在某矿进行实用，效果较好。本文将对周期自动换向金电解精炼新工艺的原理、装置及特点加以介绍。     

Standard bootstrap confidence interval estimates of CPK

The interpretation of C_pk, a common measure of process capability and confidence limits for it, is based on the assumption that the process is normally distributed. The non-parametric but computer intensive method called Bootstrap is introduced and the standard Bootstrap confidence interval estimate for C_pk is defined. An initial simulation of two processes (one normal and the other highly skewed) is presented and discussed.     

用PDSC法研究内燃机油换油周期

应用内燃机油换油周期指标的一种简易测试方法——压力式差示扫描量热仪(PDSC)测试法，对CD／SF5W／30内燃机油进行换油周期研究，利用红外光谱的氧化值、硝化值、硫化值推出了所试验的内燃机油的PDSC换油指标OIT值(氧化诱导期)。在氧气压力为0．5MPa、氧流速90mL／min、恒温210℃的条件下，CD／SF5W／30通用内燃机油在柴油车上的换油指标OIT值为1min，在汽油车上的换油指标OIT值为4min。     

An approximate nondominated sorting genetic algorithm to integrate optimization of production scheduling and accurate maintenance based on reliability intervals

With the development of intelligent manufacturing, production scheduling and preventive maintenance are widely applied in industry to enhance production efficiency and machine reliability. Therefore, according to the different processing states and the physical degradation phenomena of the machine, this paper proposes an accurate maintenance (AM) model based on reliability intervals, which have different maintenance activities in diverse intervals and overcome the shortcoming of the single reliability threshold maintenance model used in the past. Combining the flexible job-shop scheduling problem (FJSP), an integrated multiobjective optimization model is established with production scheduling and accurate maintenance. To strengthen the ability of the evolutionary algorithm to solve the presented model/problem, we propose a novel genetic algorithm, named the approximate nondominated sorting genetic algorithm III (ANSGA-III), which is inspired by NSGA-III. To improve the performance of the Pareto dominance principle, the local search, the elite storage for the original algorithm, the approximate dominance principle, the variable neighborhood search, and the elite preservation strategy are proposed. Then, we employ a scheduling example to verify and evaluate the availability of the above three improved operations and the proposed algorithm. Next, we compare ANSGA-III against five recently proposed algorithms, representing the state-of-the-art on similar problems. Finally, we apply ANSGA-III to solve the integrated optimization model, and the results reveal that the machine can maintain higher availability and reliability when compared to other models in our experiments. Consequently, the superiority of the proposed model based on accurate maintenance of reliability intervals is demonstrated, and the optimal reliability threshold between the yellow and red areas is found to be 0.82.     

部分线性EV模型中参数的经验似然置信域

本文研究了具有测量误差的部分线形EV回归模型, 利用经验似然方法构造了未知参数的对数经验比统计量, 在一定的正则条件下证明了所提出的统计量渐分布,所得结果可用于构造未知参数的经验置信域.     

关于短区间上Dedekind和的均值研究

本文的主要目的是利用Dirichlet L-函数的均值定理研究了Dedekind和在短区间[1,p/8]上的均值性质,并给出一个有趣的渐近公式。     

单调区间列的极限

将单调集合列极限的形式运用于单调区间列,并结合单调数列极限的性质得出了单调区间列的极限表达式.     

名优绿茶仿生采摘指研制

提出了一种能够模仿人工"提手采"动作的仿生采摘指结构,并完成了采摘指的结构设计。为了提高采摘指的灵巧性和结构紧凑性,对采摘指进行了运动学和静力学分析,通过遗传算法对结构几何参数进行了优化,使得驱动力的传递效率提高了26.6%。在此基础上制作了采摘指原理样机,并完成了气力驱动与控制系统的设计,室内初步试验结果表明:采摘成功率近70%,能够实现预期动作。