变幅

And Genetic Algorithms has some advantage which traditional method don"t have,for example,in Genetic Algorithms we didn"t need the calculation of grade.The optimization design of portal crane luffing system is a good example in which optimization design is applied in engineering design.

门座起重机变幅系统优化设计是将优化设计方法应用于工程设计的典型例子，但由于设计工程问题的复杂性，采用传统的优化设计方法优化的成功率及效果并不理想。

Luffing mechanism is driven by single cylinder which simplifies structure and reduces weight.

Oslash；变幅机构单油缸驱动，简化结构，减轻重量。

Tak ing 80 t crane as an optimum example,thecalculated results show as follows :the luffing path is improved;the in...

对变幅轨迹的高度差和曲线形状影响较大的多数是G、F、L＿1和a。

Traditional modle is farther attention luffing mechanism power size ,while neglect metal construction stressed stand or fall.

探寻物品在变幅过程中水平移动与臂架系统结构静态受力之间的关系，研究臂架自重平衡系统的设计与臂架系统动力响应之间的关系以及对改善该类门机的设计软件的分析手段。

To design the size of luffing systemic primary structure of the four-bar linkages" suit jib,what is mostly segment to impact these same type crane" whole-work well or bad .

传统的作法是更多的关注变幅机构功率的大小，而忽视了金属结构受力的好坏。

According to the idiographic math model of the brachial-bridge luffing system and the applying range and specialty of many kinds of optimization methods, decides touse Sequential Unconstrained Minimization Technique to optimize the model.

结合臂桥架变幅系统的具体数学模型和各种优化设计方法的适用范围与易用性，决定采用惩罚函数算法对模型进行优化设计。

According to the technological data of the large lorry crane's pictures in foreign countries, we use the method of photo-view anti-processing, gain the luffing mechanism's structural measure parameter.

摘要根据国外大型随车起重机的图片等技术资料，运用影像反求图解的方法，得出其变幅机构的近似尺寸。

A mechanics model of the No. 1 and 2 boom lulling mechanism of the 68 m platform fire truck is built and the related optimization calculation is conducted.

本文针对68m登高平台消防车折叠臂1、2号臂变幅机构建立力学模型，确定其优化目标函数，并进行优化设计。

Author was menstruated content of boron and researched the status of lack of Boron and researched relativity of its Influencing facto, the results showed that the average content of available boron in the yellow soil was 0.39±0.27 mg/kg, 80 percent of its was under 0.5mg/kg which was lack for boron and 17.44 percent of its was under 0.2mg/kg which was especially lack for boron; The distribute frequencies of available boron contents of yellow soils in Chongqing was dispersedly, its range of 0.07mg/kg to 1.99mg/kg. The diversity of different zoology area was distinct. The result of pertinence analyses showed that available boron contents had correlativity with the pH(r=0.181** n=281) and CEC（r=0.124** n=281 and It had correlativity with Organic matte When the content of organic matte is high; in addition, soil granule、clime was the Influencing factor of availability of boron in Yellow Soils in Chongqing.

笔者通过调查取样对重庆市黄壤硼的含量进行测定并分析了缺硼的程度，对其影响因素进行了相关性分析，研究结果表明：重庆市黄壤有效硼的平均含量为0.39±0.27mg/kg，其中近80%的土壤样品有效硼含量低于0.5mg/kg，属于低硼或缺硼土壤，还有17.44%的土壤样品有效硼含量低于0.2mg/kg，属于极度缺硼的土壤；而有效硼含量的分布频率比较分散，变幅较大，从0.07mg/kg~1.99mg/kg，变异系数达到69.41%，不同生态类型区土壤有效硼含量的差异十分明显；而相关性分析结果表明：土壤有效硼与土壤pH值(r=0.181** n=281)和CEC（r=0.124** n=281呈正相关，在有机质含量较高的条件下与其相关性也较为显著（r=0.347** n=90，而土壤质地以及气候也对重庆市黄壤硼的有效性有很大的影响

The results show that the cyclic softening is featured in bothvariedly hardened steels under strain controlled in the amplitude range of Δε_t,/2=0.6 - 1.8×10~(-2). The softening effect is mainly gathered in the prior some cycles.And the stress amplitude varies slightly in the sequential cycles, i. e. the softeningeffect is minified.

结果表明：在应变幅为Δεt/2=0.6—1.8×10~(-2)范围内，不同硬化状态的试验钢均表现为循环软化特性；软化效应主要集中在前几周，在随后的循环过程中应力幅变化较小，软化效应减弱；整个循环过程中，未观察到明显的应力饱和现象。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。