查询词典 optimum

The discriminance methods and expression of generalized alternative optimum solutions of linear programming is given by proving that the equivalent of optimum extreme point and extreme point of optimum solution sets of linear programming and applying the theorem of convex polyhedron.

通过证明线性规划最优解集的极点与线性规划最优极点的等价性，利用凸多面体的表达定理，给出了广泛意义下线性规划无穷多最优解的判别方法及表达式。

As a result, it shows thatthe static or dynamic subsystem optimum alone is not equal to the system optimum. Three initial value problems met in the optimal design of flying vehicle are studied andconclusions are derived that: orthogonal test method can be adopted to decide the initial valueof static optimization problem, some mathematical techniques can be used to deal with thecostate variables of Maximum Principle and decide the initial value of the costate variable,the indirect method can be used to get the analytical solution under ideal case to guide thechoice of the initial control curve in the direct method. With some numerical examples oftrajectory optimization, it shows that all these methods are useful not only in accelerating theconvergence but also in converging to the global optimum.

针对飞行器优化设计中的三种初始值问题进行了研究，以远程弹道导弹弹道的工程优化为例说明，对于静态优化问题，采用正交试验法选取初始值，不仅可以大大加快收敛的速度，而且更有可能收敛到全局最优解；以气动力辅助变轨问题为例说明，用共态变量的一阶泰勒级数展开可以解决极大值原理中共态变量初值难于确定的问题；以二级弹道导弹的主动段弹道优化为例说明，利用间接法在理想情况下得到的解析解来指导直接法初始控制曲线的选择，将大大有利于提高直接法的收敛速度。

In this paper, based on an optimum difference operator for spatial differential given by Holberg, an optimum difference method of modeling crosswell elastic wavefield is put forward, which adopts the staggered-grid technique and calculates the wavefield at different grid points. When the half length of optimum difference operator is taken as four to six points, the required number of grid points per wavelength equals to three, crosshole elastic wavefield numerical modeling can attain satisfied accuracy.

本文以Holberg提出的一种空间微分的最佳差分算子为基础，采用交错网格技术，提出了一种模拟井间弹性波场的最佳差分法，该方法能在大空间网格点上得到精确的波场值，当最佳差分算子的半长度取4～6个点，每个波长只采3个样点时，井间弹性波场的模拟就可以得到满意的精度，其计算速度比常规有限差分法至少快一个数量级。

This paper also gave a method to solve the optimum red time of two-phase signalized intersection.According to the relationship between the optimum red time and the bus arrival time,bus stopping time loss and the green time loss by bus stopping,the optimum distance between the bus stop and the stop line of the signalized intersection was determined.

给出了两相位十字交叉口最佳红灯时间的解法，并根据最佳红灯时间与公交到达时间、停靠服务损失时间及其引起的绿灯损失时间之间的关系，得出公交停靠站与信号交叉口停车线之间的最佳距离。

The optimum temperature for paramecium culture was 25 ℃ and optimum propagation temperature was 10-30 ℃. The growth condition of paramecium was better when the pH value was in the range of 5.0-10.0, but the optimum growth environment was neutral or near to alkalescence.

草履虫生长的最适温度是25℃，最适繁殖温度在1030℃。pH值在5.0~10.0的范围内，草履虫的生长状况都较好，但最适合于在中性略偏酸的环境中生长。

Then through optimum thrust force acceleration governing equation obtained by Pontryagin maximum principle and the reasonable simplification, the optimum low thrust under the orbit elements is obtained. Finally, the optimum transfer orbit analytic solution is obtained by integrating the equations.

应用Pontryagin极大值原理建立航天器最优推力加速度的控制方程，对方程进行合理的简化，只考虑它们的一次项，忽略其它的高次项，从状态方程中得出小推力对轨道根数产生的摄动影响，然后分别对它们进行积分，从而得到最优转移轨道的解析解。

C. There are great differences among trades: the optimum trade in COEs is alcohol-making, grain processing and meat processing etc.; the optimum horizontal in POEs is leather processing, clothes-making, grain processing, alcohol-making etc.; the optimum horizontal in SOEs is food processing, meat processing and refrigerative warehouse etc..

由于不同产权不同行业的企业之间的经济效益存在着差别，所以区域经济存在着巨大的经济效益潜力，以经济效益较好的民营企业为参照，通过计算，在转换机制的情况下可使得该区的经济效益提高几十倍，预言随着经济的进一步发展，国有企业民营化将会成为必然。

In the traditional reservoir operation system, in general, we use the rule curve as a method of operation, and the reservoir rule curve is the result of system simulation method. Due to the regular and simple rule curve operation unable to satisfy the actual demand effectively. In order to improve the defect, there are many system planning theories and optimum seeking methods to find the optimum operation strategies. The reservoir operators are uncomfortable with the complicated optimum operation strategies. In this article the fuzzy inference model is used to establish a simple and effective operation rule for the reservoir operator.

在传统的水库操作系统中，一般都使用操作规线为操作方式，水库操作规线是系统模拟法所获得的结果，由於规律、简单的规线操作方式往往无法有效满足实际需求，为了改善传统操作上的缺点，近多有利用系统规划之理论，应用各种优选方法求取最佳操作策略，系统最佳操作策略其模式复杂，水库操作人员不易接受，故本文即以模糊推论系统建立一简单有效之操作规则予水库操作人员，作为水库操作放水之依据。

Making use of Marshall to ascertaine the grading of mixture and the optimum pitch dosage, to the bitumen asphalt, the optimum proportion of oil to stone is 4.6%; to. the modified bitumen mix the optimum proportion of oil to stone is 5.0%.

2利用马歇尔试验法确定了混合料的级配及最佳沥青用量，对基质沥青混合料的最佳油石比为4.6%，改性沥青混合料的最佳油石比为5.0%。

In order to understand the adaptation of the microorganisms under the extreme cold environment conditions, the physiological characteristics of the 5 bacterial isolates from the Muztag Am ice core under the different temperatures were investigated. The csp gene was also amplified by PCR technique and the specific primer targeted for the cold shock protein. The observation results showed that there were three phenotypes of microorganisms: psychrophiles growing from 0~23°С(the optimum temperature at 15°C), psychrotolerant with growth range at 0~40°C (the optimum temperature at 23°С), and the thermophile with growth range at 0~45°C(the optimum temperature at 30°C).

为了解冰川微生物的生理生长特征及其在极端寒冷环境条件下的冷适应特性，从慕士塔格冰芯分离菌株中选取了5个代表菌株，分别对这些菌株的生长温度和酸度范围进行了观测，并利用微生物冷诱导蛋白的保守氨基酸序列，设计了1对冷诱导基因csp的特异引物，并对其进行了PCR扩增。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。