20%东旺百杀杀虫剂防治烟青虫试验初报

2000年7月用20%东旺百杀杀虫剂对烟青虫(Heliothis assulta Guenee)进行室内和田间的防治试验.结果表明,东旺百杀杀虫剂1000倍液、800倍液用药5d后至15d防效均达100%.药持效期在15d以上.该药剂具有较好的安全性,对烟叶不造成药害,对天敌杀伤力低,可作为一种新农药推广应用.     

China textile machinery: taking off in progress

正Among the 1600 exhibitors who take apart in the ITMA ASIA+CITME2014 2/3 are Chinese manufactures.If the numerous figures failed to attract your attention,the increase of quality should draw your focus.To adopt the demand of developing textile machine market,domestic textile machinery enterprises now follow the slogan of"technology drives development"to enhance product competitiveness.Our domestic sellers will showcase product ranging from spinning,weaving,dyeing and printing,     

Mathematical treatment of plates with colony counts outside the acceptable range

The exclusion of plate counts outside of an acceptable range can bias the estimation of concentration. If these plates are too numerous to count (TNTC), then their microbes may be inhibited. If inhibition of the microbes on a plate is suspected, then its count may be best treated as a lower bound. When these lower bounds replace counts for some plates, the estimate and confidence interval must be calculated accordingly. Also, a measure of unusualness for plate counts is discussed.     

Simulation on random motion of numerous spheres with collision-event-driven approach

Computer simulation on random motion of numerous moving spheres is widely used. This paper presents a collision-event-driven approach that efficiently implements the simulation of numerous moving spheres. For each sphere in a system with n spheres, only the detected latest collision events are saved in the event queue, making the queue only sized O（n）. Driven by the collision events in the queue, the sphere system moves forward with a running efficiency of nc（ko ＋kin）. Applying the above method to simulate the random thermal motion of numerous gas molecules in the gravity field and without the gravity field, we get an ideal simulation result.     

传统文化元素在标志设计中的体现

目的 探索标志设计中对传统文化元素的提取与运用.方法 从标志设计的设计要点及其发展需求开始,分析其对传统文化的迫切需求,并结合传统文化的特点所赋予的标志设计的审美及文化的丰富与提升,探索两者的融合可行性及主要方向,如找准契合点、把握好度、化繁为简、突出求异等方面的注意要点,然后选取了传统文化元素中的图形、字体和篆刻等元素,就其与标志设计的种种契合与科学融合展开探索,同时挖掘各领域的相关设计实例进行了深入分析与总结.结论 将标志设计与传统文化元素相结合,不仅可以对标志中所要表达的信息与形象进行展示,还能以独特的美感与文化优势实现更大意义上的价值意义,这有益于标志设计的创新与发展,同时有利于民族传统文化的传承,有着极强的应用价值与社会价值.     

规模化电动汽车参与电力系统二次调频研究综述

大规模可再生能源并入电网使电力系统频率稳定支撑能力下降,给电力系统二次调频带来新的问题与挑战,电动汽车由于集群庞大且具有准确快速的动态响应能力而成为新型调频资源。首先,对规模化电动汽车参与调频辅助服务系统框架进行总结,从可调节容量直接量化和能量可行域两方面对电动汽车集群可调节容量量化方法进行归纳;然后,从模型、方法和应用等多个角度,对电动汽车参与电力系统二次调频的日前优化调度和实时控制过程展开综述;最后,对规模化电动汽车参与电力系统二次调频未来的研究方向和关键技术进行了展望。