空心铝型材挤压过程计算机仿真系统

试开发了一套基于计算机辅助设计和数值模拟的空心铝型材挤压过程计算机仿真系统,它涵盖了模具工艺设计的全过程,可以集成原有的和新建立的工艺设计知识。该系统包括空心型材挤压模具及坯料的参数化几何造型模块,并能分析分流桥的截面形状、分流孔的布置、焊合室的高度、工作带长度和阻流或者助流结构对金属流速分布的影响,模具的弹性变形对工作带有效长度和模孔尺寸的影响。     

操作参数对煤泥脱水效果的影响

探究不同操作参数对煤泥脱水效果的影响,通过改变操作参数进行单因素试验,分别探究入料浓度、入料流量、转鼓转速对煤泥脱水效果的影响,并通过正交试验确定三者的主次序列.结果表明,随着入料浓度的增加,煤泥的脱水效果越来越好,产品的含水率逐渐降低;在一定的入料流量范围内,随着入料流量的增加,产品的含水率降低,但是超过某一流量后,含水率会有所增加;在转鼓最大允许范围内,产品水分随着转速的增加而降低.通过正交试验可以得知影响脱水效果的主次因素依次为转鼓转速、入料流量、入料浓度.     

高压交流线路避雷器劣化状态数值仿真

高压交流线路避雷器的劣化分析是保障其运行安全的重要评估技术.针对避雷器出现的劣化问题,提取其伏安特性中的小电流区间,建立数学表征模型,并以模型中的时间常数表征氧化锌的劣化程度.结合晶粒物理结构、Voronoi网格分析晶粒及晶粒间的电气连接特性,推演RC等效电路模型并简化电路.开展数值仿真计算,获得不同劣化程度下避雷器的伏安特性曲线以及交流电压作用下的阻性电流变化规律,分析了容性电流分量与谐波电压对总泄漏电流的影响.泄漏电流波形的畸变率可判断避雷器的劣化程度,模型可辅助优化基于泄漏电流的避雷器在线监测与诊断技术.     

Analysis of D.C Parameters of Short-Channel Heterostructure Double Gate Junction-Less MOSFET Circuits Considering Quantum Mechanical Effects

Silicon - In this article, the electrical behavior of short channel SiGe Heterostructure Junction-Less DG-MOSFET have been studied by incorporating the quantum mechanical effect and short channel...     

边缘AI的霜雪识别系统设计与实现

为提高霜雪识别系统的识别率,开展了基于边缘AI的霜雪识别系统设计。综合海思嵌入式处理器Hi3559A高算力、低功耗特点,硬件部分采用模块复用的方法降低功耗和资源消耗,软件部分,从模型训练、模型量化、模型部署入手对MobileNetV2图像分类网络和ISP自适应处理算法进行改进,最终识别率99.7%,预处理时间0.3 s,图像分类时间0.8 s,模组平均功率2 W,鲁棒性好、性能稳定。由此可见Hi3559A智能相机模组可有效纠正雪深探测仪的疑误数据。     

Quantum DCS系统及其应用体会

中国联合水泥公司3000t／d熟料生产线电气控制系统采用了法国施耐德公司的Quantum DCS系统，实现对全厂所有设备的工艺操作和控制。全面介绍了QuantumDCS系统的特点、功能系统构成网络，并详细总结了确保该系统稳定可靠运行的使用和维护的经验。     

A Simple D 2-Sampling Based PTAS for k-Means and Other Clustering Problems

Given a set of points \(P \subset\mathbb{R}^{d}\) , the k-means clustering problem is to find a set of k centers \(C = \{ c_{1},\ldots,c_{k}\}, c_{i} \in\mathbb{R}^{d}\) , such that the objective function ∑ _x∈P e(x,C)², where e(x,C) denotes the Euclidean distance between x and the closest center in C, is minimized. This is one of the most prominent objective functions that has been studied with respect to clustering. D ²-sampling (Arthur and Vassilvitskii, Proceedings of the Eighteenth Annual ACM-SIAM Symposium on Discrete Algorithms, SODA’07, pp. 1027–1035, SIAM, Philadelphia, 2007) is a simple non-uniform sampling technique for choosing points from a set of points. It works as follows: given a set of points \(P \subset\mathbb{R}^{d}\) , the first point is chosen uniformly at random from P. Subsequently, a point from P is chosen as the next sample with probability proportional to the square of the distance of this point to the nearest previously sampled point. D ²-sampling has been shown to have nice properties with respect to the k-means clustering problem. Arthur and Vassilvitskii (Proceedings of the Eighteenth Annual ACM-SIAM Symposium on Discrete Algorithms, SODA’07, pp. 1027–1035, SIAM, Philadelphia, 2007) show that k points chosen as centers from P using D ²-sampling give an O(logk) approximation in expectation. Ailon et al. (NIPS, pp. 10–18, 2009) and Aggarwal et al. (Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques, pp. 15–28, Springer, Berlin, 2009) extended results of Arthur and Vassilvitskii (Proceedings of the Eighteenth Annual ACM-SIAM Symposium on Discrete Algorithms, SODA’07, pp. 1027–1035, SIAM, Philadelphia, 2007) to show that O(k) points chosen as centers using D ²-sampling give an O(1) approximation to the k-means objective function with high probability. In this paper, we further demonstrate the power of D ²-sampling by giving a simple randomized (1+?)-approximation algorithm that uses the D ²-sampling in its core.     

Preparation and characterization of low-halogen and nonhalgoen fire-resistant low-smoke (FRLS) cable sheathing compound from blends of functionalized polyolefins and PVC

An attempt is made to develop a novel series of cable sheathing compounds with variation in chlorine content and sufficient fire retardance and unique low-smoke characteristics. These are prepared by blending PVC and functionalized polyolefins in different compositions. PE and EPDM have been functionalized by grafting dibutyl maleate (DBM) using DCP as initiator. FRLS compounds made from PVC-functionalized polyolefin blends possess the special characteristics of low-smoke, low-acid-gas generation, increased fire retardance, and improved volume resistivity, which are much better in comparison with a typical PVC sheathing compound. Thermoplastic elastomer (TPE) based nonhalogen FRLS compounds are also reported. The mechanisms for grafting, polymer-polymer and polymer-filler interactions have been presented.     

混凝沉淀-ABR-SBR法对造纸废水的处理

对草浆造纸混合废水,分别进行了混凝厌氧折流板反应器（ABR）、序批式反应器（SBR）过程的运行及组合工艺处理的研究,结果表明：当混凝沉淀加药量PAM为4mg/L、PAC为30mg/L、ABR的HRT为9h时,废水可生化性由0.25增加到0.43,SBR最佳HRT为8h,分别运行时,COD去除率60%左右;而组合工艺中SBR处理效果明显提高,系统COD去除率达90%以上,出水完全满足国家二级排放标准。     

文化富思特——富思特制漆(北京)有限公司董事长郭祥恩解读企业文化真谛

几次作为听众,聆听了富思特制漆(北京)有限公司董事长郭祥恩关于“推动精细化管理,打造精英化团队”的精彩演讲;在富思特成立十周年之际,又不经意间拜读了《富思特2005时代的音符》——一本耐人寻味的小册子。无论是郭总慷慨激昂的演讲,还是充满哲理的字里行间,无不透露着一股浓浓的文化氛围。而对于作为富思特公司决策者的郭祥恩,更能感觉到他是一位充满智慧与激情的文化引领者。论及企业文化,人们并不陌生,大至实力强大的世界级顶尖公司,小至名不见经传的小企业,都会有自己的企业文化,有自己的文化架构。但把文化作为一种信念、一种价值观…