查询词典 optimal position

Optimal control of DSS formation adjusting based on Hamilton Mechanics and generating function method was investigated. An iterative way of solving the two-point boundary value problem induced by optimal control by relative motion generating function approximation was proposed.

基于考虑J_2项的DSS相对运动Hamilton力学模型和生成函数方法研究了DSS构形调整的最优控制问题，提出了求解最优控制两点边值问题的相对运动生成函数近似迭代方法。

The stability problems are analyzed and discussed. The optimal control problem is formulated to determine the necessary conditions for optimality in networks. Three theorems about the properties of the steady state-costate solution in Hamilton function are confirmed leading to the natrual meaning and the optimal policy which can be implemented in practice. In chapter Ⅴ, the methods for nonstationary simulation of computer networks are discussed.

第四章表述了计算机通信网动态特性研究的主要数字方法；提出了排队与随机存取机制、网络链路传输和节点分流的状态空间模型，并作了稳定性研究；应用最优控制理论得到网络最优控制的必要条件，证明了哈密尔顿函数协状态变量的稳定解性质，据此研究分析了网络最优控制的本质意义及实现途径，并给出计算及建模实例。

The method combing harmonic linearization and integral time absolute error optimal control to realize the PWM converters' optimal control is proposed according to the hysteresis current control's characteristics.

根据滞环电流控制的特点，提出了将谐波线性化方法与ITAE优化控制律相结合的方法，以实现对PWM变换器的优化控制。

Meanwhile, on the basis of simulation model, the paper introduces the concepts of the combination of ship types, combination of berths, hectometer coastline throughput capability and coastline utilization ratio. By using curve fitting, the function between Tw/Tb and hectometer throughput capacity is achieved. Further more, the analysis of the optimal and suboptimal ship types combination and berths combination correspond to the fixed coastline and the optimal coastline length to the fixed ship types combination and berths combination is obtained.

同时，基于仿真模型，本文引入了船型组、泊位组、百米岸线通过能力及岸线利用率四个新的规划指标，拟合分析了到港船舶的待泊时间与靠泊时间比值Tw/Tb与百米岸线通过能力的函数关系，并进一步分析了在固定岸线长度下与其相适应的最优、次优的船型组合及泊位组合，确定船型组合、泊位组合情况下的最优岸线长度。

By using curve fitting, the function between Tw/Tb and hectometer throughput capacity is achieved. Further more, the analysis of the optimal and suboptimal ship types combination and berths combination correspond to the fixed coastline and the optimal coastline length to the fixed ship types combination and berths combination is obtained.

同时，基于仿真模型，本文引入了船型组、泊位组、百米岸线通过能力及岸线利用率四个新的规划指标，拟合分析了到港船舶的待泊时间与靠泊时间比值Tw/Tb与百米岸线通过能力的函数关系，并进一步分析了在固定岸线长度下与其相适应的最优、次优的船型组合及泊位组合，确定船型组合、泊位组合情况下的最优岸线长度。

Then the great loss risk of hedger is avoided. based on expected-variance optimal model,the optimal model is set up by using the skewness parameter.

通过偏度约束控制了当收益分布向右偏斜时的重大损失发生的概率，解决了套保者遭受重大损失的问题。

Considering transaction cost, Hedger's attitude to risk, variance of foreign exchange rate , with Von Neumann Morgenstern utility function and Bernoulli principle, this paper analyses optimal hedging of the foreign exchange risk during the import/export with forward/future contracts, and the influence of the above mentioned factors on the optimal hedge rate.

本文在前人研究基础上，考虑交易费用，决策人对风险的态度，汇率相对风险大小等因素，用Von Neumann- Morgenstern效用函数和 Bernoulli决策法则建立了研究利用远期/期货和约做外汇套期保值问题的一般模型，然后具体分析了一种典型情况下的最优套期保值率的性质。

We investigate similar questions for other elliptic operators, such as the Schrodinger operator, non homogeneous membranes, or the bi-Laplacian, and we look at optimal composites and optimal insulation problems in terms of eigenvalues.

我们对相似的问题进行其他椭圆的操作者的研究，例如薛定鄂算子，非同类的膜或者双Laplacian，并且我们就eigenvalues而言看最佳的混合物和最佳的绝缘问题。

Isolation, purification and characteristics of D-hydantoinase were carried out. The experiment results showed that the optimal pH and temperature of pure D-hydantoinase were pH 8. 5 and 35℃, respectively. D-hydantoinase activity could be increased significantly by Mn〓 and Fe〓. Substrate specificity of D-hydantoinase on various hydantoin derivatives showed the optimal substrate of D-hydantoinase was 5-phenylhydantoin, but hydantoin, 5-methylthioehylhydantoin, 5-hydroxyphenylhydantoin, 5-methylhydantoin, 5-benzylhydantoin could also be hydrolyzed by D-hydantoinase.

本文还进行了海因酶的分离纯化及性质研究，发现酶的最适反应温度为35℃，最适pH为8.5，金属离子Mn〓和Fe〓能显著提高D-海因酶活力。D-海因酶的特异性实验表明，D-海因酶的最适底物为D，L-苯海因，其次为海因，D，L-对羟基苯海因和D，L-甲硫乙基海因，对D，L-甲基海因和D，L-苯甲基海因也有一定的作用。

The results showed that the optimal compositions of medium were 15 sweet potato starch hydrolyte, 0.40 (NH4)2SO4, 0.03 KH2PO4, 0.044 ZnSO4-7H2O, 0.025 MgSO4-7H2O, and that the optimal culture temperature and rotation rate were 32 癈 and 220 r/min respectively.

摇瓶发酵最佳培养基：甘薯淀粉15，(NH_4)_2SO_4 0.4，KH_2PO_4 0.03，ZnSO_4·7H_2O 0.044，MgSO_4·7H_2O 0.025。最佳培养条件为32℃，摇床转速220 r／min，装液量100mL／500mL三角瓶，发酵16h后一次性添加CaCO_370g/L。

The witness also told the jury at the Royal Courts of Justice in London that he saw a paparazzo fighting with a member of the public who was trying to stop him taking pictures in the minutes before the emergency services arrived.

他还告诉在伦敦皇家法庭的陪审团，在急救服务到来之前，他当时看见一个狗仔队正和一群阻止他拍照的人打架。

The entire N／C program on a tape is made up of an accumulation of these successive data blocks.

纸带上的整个数控程序由这些连续数据单元连接而成。