The cotton bollworm had not been the domiant pest in transgenic bt cotton field , but the number of aphids , ded spider mite , whitefly and so on , increased obviously 害虫优势种是棉铃虫、花蓟马、棉蚜、朱砂叶蜻,天敌优势种类为蜘蛛类、七星飘虫、龟纹飘虫。
Deds theory reflects dynamical law of all kinds of man - made systems . with going deep study , people start knows a few important problems w hich discrete event interacting with continuous variable that so called hybrid system 离散事件动态系统( deds )理论是一类新的系统理论,反映了各种人造系统运行的内部规律。
So the research of the total process time and the optimal scheduling of the workstation can be regarded as that of relevant random variables . the traditional methods for modeling and analysing are mostly based on mathematical methods 传统的建模和分析方法大多基于数学抽象,由于deds所具有的离散性、随机性等特点,有时很难用解析方法描述。
Because of its discrete and stochastic charactet , it ' s hard to study deds only in terms of analytical approach . therefor the paper discusses the character of the serial production line of the production system by the method of stochastic ana1ogue and numerical simulation 本文针对制造系统中的串行生产线,用随机模拟和数字仿真试验方法进行研究,并编写了一套仿真软件进行试验,以概率统计等数学工具进行分析,得出了生产线总加工时间的一些性能特征。
Unlike the continuous variable dynamical system ( cvds ) or discrete event dynamical system ( deds ) , hybrid system contains not only continuous dynamical system subject to newton ' s law of causation but also discrete event system satisfied the optimal decision logic principle , and both of them accord with the strong interaction condition 与单一的连续变量动态系统( cvds )或离散事件动态系统( deds )不同,在混杂系统中既包含了服从物理学定律的连续变量动态系统又包含了遵从优化决策信息逻辑原则的离散事件动态系统,而且两者处在一种强相互作用的制约机制中。
The behaviors of the inflow and sediment , the recent evolution rules and trend of the river channel in this section as well as the changing rules and causes of the change of the hechangzhou brai - ded channel are analyzed and the scheme researches , engineering design , construction and the effects of the control works at the entrance of the left branch of the hechang sandbar are presented in the paper 根据镇扬河目前的情况分析了该河段来水来沙特点、近期河道演变规律及演变趋势,介绍了该河段二期整治工程的基本情况,并着重介绍了和畅洲左汊口门控制工程方案研究、设计、施工及工程效果等内容。
This paper propose a improvement method of mzte , adopted in mpeg - 4 for encoding stilltexture . firstly , the basic conception of image / video compression is provi - ded , and then the conception of wavelet decomposing and fractal predictive encoding , lastly , mzte and it ' s improvement is illuminated detailedly 首先分析了图像及视频压缩的技术现状,论述了小波分解及在图像压缩中的应用、分形预测编码的理论和方法,然后重点对mzte进行了深入的论述分析,最后对mzte的改进作了详细说明。
The discrete production system is an important part of the deds research . in the scheduling of the discrate production system , a lot of problems can be described as that of the following serial production line : n workpieces are processed through m workstations in turn , the process time for the workpiece varies with the workstation . in most practicai subject , the process time for the workpiece is random , which can be taken as different random variable 离散制造系统是离散事件动态系统( deds )研究的一个重要内容,离散制造系统中调度的许多问题,可以描述为下列串行生产线的问题,其模型可看成为n个工件依次通过m个工作台进行加工的典型问题,不同工件在各工作台的加工时间各异,在实际大多数对象中,工件通过工作台的加工时间是随机的,应看成是不同的随机变量,因此加工总时间与工作台的优化调度问题就成为随机变量之间的演算。
Firstly , transfer the research study theory to physics education . the conception , meaning and possibility of the research study in physics education have been discussed , the difference between it and the tradition physics teaching explored , and the reason for building up energy knowledge framework as the subject of research study expoun ded . secondly , general teaching design being combined with characteristic of physics , the conception , characteristic , meaning , principles , preparation and basic factors of the research study teaching design in physics explored based on constructivism , humanism , scientific philosophy theory , curriculum and new education philosophy , the theory of lifetime education 从理论层面上研究了两方面的问题,第一,把研究性学习的基本理论迁移到物理学科教学之中,对物理学科教学中研究性学习的概念、特点、特征、意义、物理教学中开展研究性学习的可能性、它与传统物理教学的区别等问题作了探讨,并阐述了本课题选择建构能量知识结构作为研究性学习主题的理由;第二,以建构主义学习理论、人本主义学习理论、系统科学、新的教育哲学观,科学哲学理论、终生教育理论为依据,结合常规教学设计理论和物理学科的特点探讨了物理学科研究性学习教学设计的概念、特点、意义、遵循的原则、设计前的准备工作、教学设计的基本要素等理论问题。
The typi ca1 symptom j s fold and b1 istering , even d istortj on , 1ops i ded j ] ] - - ] eaf , shorti ng p ] ant , there are motley with 1ight green and deep green , and some of the mot ] ey are ye1wt mm 1eave m tny : the i ] . 1 - - 1ed has arias mosai c , 1ops i ded , and the tissue of the i11 - - 1eaf has deteriorated exceeding1y , with s1ender pteridophyte 1 . eaves , i l1 p1ant is green - - yei 1ow , obvious1y shortened in joint , the who1e p1ant serious1y shortened and grows thickly 南瓜病毒病的典型症状为皱缩有疱斑、甚至扭曲,病叶畸形,植株矮化;花叶叶片上出现淡绿色和深绿色相间的斑驳,有的斑驳明显黄化;蕨叶丛枝型:病叶不但严重花叶、畸形,而且叶肉组织极度退化,纤细呈蕨叫叶状,病株黄绿色,节间明显缩短,整个植株严重矮化丛枝状。