比利时变垃圾为"宝"

在比利时,“回收垃圾,保护坏境”已成为国民的共识,“从我做起,提高垃圾的再利用率”变成了人们的自觉行动。公众越来越清楚地认识到,离开了垃圾的科学分类,垃圾减量化、无害化和资源化的实现将无从谈起,分装垃圾是生活中不可或缺的大事之一。     

风往哪吹

在开放多元的时代里,唯一不变的就是变化。目前,中国服装产业正站在新的十字路口,新风口下如何满足消费者多样化需求,与消费者更进一步,成为服装企业及品牌考虑的问题。直面当下,才能洞悉未来。近日,艾瑞咨询发布《服装行业七大风向》,报告总结了通过联名款焕新拓品的胶囊系列、以残疾人为目标但健全人也可以穿着的适应性服装、从小众潮流变成大众流行的山系/户外风、基于植物纤维的可降解的纯素皮革、帮助品牌与消费者建立更紧密联系的虚拟服装、集合功能性和亲子需求的宠物服装、以国为基础潮和为核心的国潮服饰将成为未来服装行业的风向,为服装行业相关企业和品牌呈现了新的思路。     

Delay Analysis and Formulation Inference of Signalized Intersection for Traffic Congestion Conditions

Vehicle delay is an important measure to evaluate the signal timings of signalized intersections.When optimization the signal control parameters, delays of vehicles from all approach directions of an intersection should be considered. Based on the analysis of the vehicle delay on an approach of intersection, directed against the typical condition of a congested intersection——over-saturated condition, the paper has analyzed and inferred the intersection delay dynamic formulation, and has established the relation between intersection delay,the signal timings, vehicle arrival rate and the queue lengths, and that provides useful information for understanding vehicle delay of signalized intersection and for establishing performance index function of signal timing optimization.     

西门子PLC的顺序控制系统设计及实例

探讨西门子1200 PLC的顺序控制方法，即启-保-停编程方法和基于置位/复位指令的编程方法。这两种编程方法都能够直观清晰地将顺序功能图转化成梯形图，但在实际转化过程中启-保-停编程方法存在一定的问题。最后，基于置位/复位指令的编程方法，通过流程图、波形图分析，设计了十字路口交通灯控制系统。该系统简单清晰，易于调试，可靠性高，并通过SIM仿真表和人机界面（HMI）验证了其可行性。