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Dominant role in the teaching of college English, it needs gradual systemization to

能成为英语教学的主导内容,但也需要逐渐地系统化,使之成为优化教学效果的不可缺少

Based on the analysis of the stability of the nature tailless UAV, The control system of the tailless UAV is designed by using the classical control method and a time-based method is used that can tune up control law parameters automatically by virtue of optimizing.

为了使所设计的控制器参数较优,本文以滚转保持与控制模态为例,采用了一种带有时域约束的优化控制方法设计出这些回路的基本控制律参数,并针对各控制模态在频域内进行稳定性分析,证实了该调参方法在工程上可以得到很好的应用; 4。

In the algorithm, tangent plane of the surface at each point is first calculated according to the point and its neighbor points. In an optimized sequence, normal vectors of the tangent planes are oriented to the outside of the surface. Finally, marching cube method is used to output the triangular representation of the surface.

该算法首先根据测点的邻近测点估算曲面在该测点处的法矢,并采用优化的顺序对法矢方向进行调整以使各测点处的法矢都指向曲面外侧,最后用步进立方体算法输出三角网格模型。

Union Kudzu root own characteristic, before the fermentation increases the few amylases, the maltogenic amylase carries on a series of optimized processing to the Kudzu root, the acceleration microorganism fermentation, causes in the black glutinous rice, the Kudzu root the flavanone and so on the beneficial material full dissolution inside the fermented alcohol fluid, develops the wine taste tastily, unique, does not have the unusual smell, and includes certain flavanone material black glutinous rice Kudzu root liquor.

结合葛根自身特性,发酵前添加少量淀粉酶、糖化酶对葛根进行一系列优化处理,加速微生物发酵作用,使黑糯米、葛根中黄酮等有益物质充分溶解在发酵酒液里面,研制出酒味爽口、独特、无异味,并含有一定黄酮物质的黑糯米葛根酒。

Some models were designed where the unique tetragon and hexagon grids borrowed from the wing structure were used as the basic elements, these models were analyzed numerically, it is shown that the model consisting of tetragon grids is much stiffer than that consisting of hexagon grids, while, more material is used in the first model;crinkling models based on tetragon grids or arched models consisting of hexagon grids become more stiffer than flat ones;hybrid models consisting of tetragon grids and hexagon grids can realize a proper balance between material saving and stiffness improving.

分别提取四边形、六边形的基本网格,建立结构模型,并对它们进行非线性数值分析。研究发现:四边形网格结构刚度大,六边形网格结构刚度小;而从材料利用率角度来讲,六边形网状结构更省材料;起皱对四边形网格结构刚度有加强,而起拱对六边形网格结构刚度有提高;如果将四、六边形的网格进行合理搭配,可以使结构刚度和材料利用率得到优化。

It will expose the design problem of maintainability of civil airplane to the early stage of design. This paper discusses the composing of the virtual maintenance environment, builds non-immersion virtual maintenance environment of undercarriage, and establishes a part library management system. The characteristic of maintainability models and maintainability analysis based on virtual technique is researched to give the maintainability frame model of civil airplane virtual maintainability analysis. All levels of maintenance time model and maintenance man-hour model are established. Analog-Huffman code is proposed to optimize space partition method in traditional collision detection arithmetic."Maintenance therblig"is brought into the broken down of maintenance tasks, and the new maintenance tasks broken down method is proposed. The demands of human measure, position, and equipment layout in human engineering are discussed, and the verification methods of human measure, position and equipment layout in virtual maintenance are given. Basic principle and verification procedure of maintainability virtual verification is developed primarily, and the reachablity, the visibility, and posture-comfortability are verified.

本文论述了虚拟维修环境的组成,构建了某型飞机主起落架非沉浸式虚拟维修环境,建立了维修对象的零件库管理系统;研究了基于虚拟技术的维修性模型特点及维修性分析流程,给出了基于虚拟技术的民机维修性分析框架模型,并结合传统维修性模型,建立了各级维修时间模型和维修工时模型;提出类HUFFMAN编码,结合人因工程的要求,优化了传统碰撞检测算法中的空间分割法,使之适用于柔体;在维修性分解中引入"维修动素",给出了与CATIA、DELMIA等应用软件结合紧密的维修任务分解方法;论述了人因工程中对人体尺寸、姿势、设备布局的要求,给出了虚拟维修中人体尺寸、姿势分析、民机内设备布局的验证方法;初步制订了维修性虚拟验证的基本原则和验证程序,并结合具体实例对可达性、可视性、干涉性以及人体姿态舒适性进行了验证,较清晰、真实地反映了维修人员的维修状态。

The optimized structure can more reduce thrust tipple, which provides ideal condition for precision machining and high dynamic response of servo system.

并且其优化后的结构使电机推力波动进一步减小,为伺服系统的超精密加工和高动态响应提供了理想的条件。

Based on above results, the fermentation medium and cultivation conditions were investigated and the uniform design method was used in the optimization of fermentation medium. The techniques of fed-batch culture were also investigated in this paper, with this techniques acarbose fermentation titre increased from 1416 μg/ml to 2700 μg/ml, basically reached the level of industrial production.

在此基础上,又对发酵培养基的组成及发酵条件等方面进行考察,并采用均匀设计的方法对发酵培养基的组成进行了优化;对补料等发酵工艺进行了考察,使发酵单位由原来的1416μg/ml提高到2700μg/ml,基本上达到了工业化发酵的水平。

The process flow and plane disposal ofheavy raw material MEK toluol unit and solvent recovery system have beenoptimized in this project to meet present production demand, moreover there still isspace left to be extended and developed for the future.

本项目优化重质酮苯脱油装置及溶剂回收系统的工艺流程和装置平面布置,使之满足目前生产,并留有今后扩建和发展余地。

According to the three criteria, an appropriate doorsill is found by adaptively adjusting a discount factor in the process of iteratively solving. 2. 3 Method of Processing the Deleted Elements According to the doorsill, the continuous topological variables can be regressed to the 0-1 type discrete topological variables.

2.2 调整折减系数搜索最佳阈值为了能使程序快速准确的得到满足约束的最优拓扑结构,根据框架结构的特性引入结构非奇异、结构响应不被违背和结构重量不改变三个准则判断迭代收敛,并根据这三个准则的满足情况,在优化迭代过程中自适应的调整折减系数来搜索最佳阈值。

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推荐网络例句

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性,但我大喊,并在他们的方向扔石头让他们过的线索,远离我,以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。

Store this product in a sealed, lightproof, dry and cool place.

密封,遮光,置阴凉干燥处。