查询词典 three-body problem

The paper gives stiffness matrix and mass matrix in finite element analysis of the ground vibration problem caused by track traffic by using three-dimension finite element method. Because three-dimension finite element analysis is very difficult, it is transmitted into a quadratic programming, which can be calculated by neural network.

本文融合神经网络技术和遗传算法，对轨道交通引起的地面振动进行了正分析和反演，并利用计算机技术实现了地面振动的三维动画模拟，这主要包括：(1)研究了压缩映射遗传算法，利用Banach空间的不动点定理证明了压缩映射遗传算法可以收敛到全局最优值，弥补了标准遗传算法不能收敛至全局最优值的不足。

Three optimization algorithms such as linear programming, complex algorithm and genetic algorithm, corresponding to three kinds of models were used to solve the optimization problem according.

针对装置不同的数学模型我们分别采用线性规划、复合形调优法、遗传算法作为优化方法，又对复合形调优法、遗传算法进行了相应的改进得到了相应的计算结果。

In order to solve this problem and dismantle the fuses automatically, the detonators are classified into three types, i. e. slot type, hole type, nut locking and smooth cylinder type. Three types of tools used to dismantle the fuses are designed, which are bit type, pin type and jaw type.

针对这一问题和引信自动分解的要求，将传爆管分为槽型、孔型、锁紧螺母和光滑圆柱面型等三种类型，相应地设计了刀片型、卡针型和卡爪型三种旋卸头，重点研究了卡爪型及其卡爪曲线设计计算方法。

And the other problem is, you're turning over your laptops every two-three years, your desktops every two-three years and then loading it up with software and then again running it at a very low utilization rate.

另一个问题是，你每隔两三年更新你的手提电脑和台式电脑，然后重装系统，再以一个很低的利用率运行。

The paper investigates the problem of three-phase and three-line shunt APF with simulation and experiment.

本文分别采用了仿真和实验的方法对三相三线并联型有源电力滤波器各个方面的问题进行了研究。

Theory basis provided to solve the problem of vibrationof the universl coupling of three-crank type and to increase the transmission of the universalcoupling of three-crank type.

由于三曲柄式万向联轴器的输人构件上各曲柄杆的轴线分别与输出构件上相应的导向滚道槽轴线相交，所以可根据其相交条件分析其运动关系。图1和图2分别表示三个曲柄杆及三条导向滚道槽轴线在图中所建立的坐标系中的位置tl。

He said that on the stock headlamps assembly problem, the inspection station also conducted a survey, the market there is only Wuyang Honda and Yamaha have a "three-card" products, need to go through distributors by Agents from the manufacturers wholesale, wholesale prices up to 250 yuan, Fuzhou market can not find other "three-card" products.

他说，关于大灯总成的进货问题，该检测站也进行了调查，市场上只有五羊本田和雅马哈有&三证&产品，需要经过经销商经代理向厂家批发，进货价格就高达250元左右，福州市场找不到其他有&三证&的产品。

In studies of interaction among pile, platform that above it and surrounding soil, this paper employ the concept of plate element to simulate the loading character of platform, and employ the concept of solid element to simulate the character of pile and soil, using the finite element method after understanding the geometry properties of pile, soil and the platform. Analyzing the loading properties of the three entities above and their deformation, this paper also employ a special element, Penalty Element. The introduction of penalty element of this kind has served to guarantee the join harmony of displacement between solid element and plate element, thereby effectively resolving the join problem between platforms, pile that support it and surrounding soil.Considering significant property difference between pile material and its surrounding soil, there may be much shear stress on their contact interface produced under vertical load, thus causing displacement or fission. Therefore it is necessary to adopt one special constitutive law of this kind of contact interface, which can reflect its feature of loading and deformation thoroughly. On the basis of the deformation feature and constitutive laws of some contact interface obtained by Zhang Dongji and people concerned through some single-shear experiments on contact interface between structure and soil, this paper employ one pile-soil three-dimensional constant thickness contact interface model to simulate the " slide" taken place on the interface between pile and its surrounding soil. With this kind model, this paper has also created one finite element model, which can be applied to perform finite element calculation and analyze the pile-loading feature, and deduced its element stiffness matrix.

在承台-桩-土共同作用中，考虑桩与承台的几何特性，采用有限元方法，用实体单元模拟桩土，用板单元模拟承台，更具体地分析桩和承台的受力特性和变形，而且还采用罚单元—既实体单元与板单元之间连接必须满足变形协调条件，来有效地解决了承台与桩土的连接问题，且在桩土共同作用中，由于桩体结构的材料性能与周围土层性质相差较大，在竖向荷载下有可能在其接触面上产生较大的剪应力从而导致错动或开裂，因此，为了充分反映桩土接触面上的受力及变形特征，应采用一种桩土接触面特有的本构关系，即利用张冬霁等人关于结构与土体接触面单剪试验所得到的接触面变形特征及其本构关系，引入桩-土三维等厚度接触单元来模拟桩与桩侧土之间的&滑移&，在此基础上建立可用于桩基承载性状分析的有限元计算单元模型，并推导出了各单元的刚度矩阵。

This algorithm uses binary tree to construct the multiclass frame by decomposing the problem into three 2class classification problems, then uses Support Vector Machine optimizing the three hyperplanes.

该算法首先使用二叉树进行多类决策，将原始分类数据分解成3个二类分类问题，然后利用SVM进行二类分类，使3个分类超平面得到优化。

Shading experiments were designed according to low light intensity problem caused by intercropping system of peanut with maize or wheat et al. Fenghua1 and Fenghua2 were adopted in the experiment of four light intensity levels (CK in which the plants were grown under natural light, 27% shading, 43% shading and 77% shading), which carried out at three growth stage using black sunshade net. And the three stages were seedling phase, pod-setting phase and pod-maturing phase. The aim of this study was to investigate the effects of low light on the photosynthetic characteristics, luminous energy distribute of PSⅡ, RuBPCase activitiy, plant morphogenesis, dry matter production, pod yield and quality of peanut at different stages, defined the relationship between dry matter accumulation and PAR, relationship of efficiency for solar energy utilization and PAR, and then set up the ...dry matter production and yield formation model on the basis of the experimental data.

针对花生与玉米、小麦等作物间作、套种造成遮光问题，选用大花生品种丰花1号和小花生品种丰花2号做为供试材料，在花生苗期、结荚期和饱果期分别用不同透光率的遮阳网进行遮光处理模拟弱光条件，设置自然光、遮光27%、遮光43%和遮光77%四种光强水平，研究了光强处理对花生光合特性、光系统Ⅱ光能分配、RuBPCase活性、植株形态建成、物质生产和产量以及品质的影响，明确了不同时期干物质积累及光能利用率与光合有效辐射的关系，以此为基础采用2种方法建立了花生干物质生产动态模型和花生产量形成模拟模型，并对各模型的模拟精度进行了比较。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。