查询词典 necessary condition

The system of acquisitive prescription is a rational and necessary system under the condition of market economy.

取得时效制度在市场经济条件下有其存在的合理性与必要性。

Moreover, based on the symmetric Rouche's theorem, a necessary and sufficient condition for the Hurwitz stability of the convex combinations of polynomials is proposed. This condition is simple and can be easily applied to the Hurwitz stability analysis of the convex combinations of polynomials.

而且基于对称Rouche定理给出了多项式凸组合Hurwitz稳定的一个充要条件，该充要条件直观简明，用于分析多项式凸组合的Hurwitz稳定性十分方便。

By combinatory counting process to enumerate data of work condition of each generators, thus makes sure the searching and solver in optimal condition.3. Set up the power equilibrium equation and flow equilibrium equation according to the slack variable. It is not necessary to adjust the optimization any more and guarantee the optimal precision of the solution.4. Digitalize the composite characteristic curve, such as the digital input and accurate extraction of data during the performing.The above mentioned is an expanding for optimal performing of hydropower station in theory. It has good engineering applicability.

在水轮机专业领域和水电站运行领域主要成果是：(1)用人工智能的方法解决了水电站机组间负荷动态最优调度问题，且用数学方法严格证明了解的最优性；(2)用组合计数对并联机组的每个组合工况进行无遗漏枚举，从而保证搜索策略的作用范围和解的最优性；(3)利用松弛变量建立了功率平衡方程和流量平衡方程，使优化结果不再需要二次调节，保证了解的优化精度；(4)综合特性曲线的数字化，包括曲线的数字化输入和在程序运行过程中对曲线信息的精确提取。

A necessary and sufficient condition for the existence of guaranteed cost control is derived. Furthermore, it is shown that this condition is equivalent to the solvability of a system of linear matrix inequalities, and its solution provides a parameterized representation of guaranteed cost controllers. Based on that, the design of the optimal guaranteed cost controller is formulated as a convex optimization problem, which can be solved by the existing convex optimization techniques.

通过采用线性矩阵不等式的方法，导出了存在保性能控制律的一个充要条件，进而，证明了该条件等价於一组线性矩阵不等式的可解性问题，并用这组线性矩阵不等式的可行解给出了保性能控制律的一个参数化表示。

The problems of robust stability and robust stabilization for interval systems were discussed. A necessary and sufficient condition for the robust stability of a line segment polynomial was proposed. The tested results of robust stability of a polynomial polytope and robust stabilization of an interval system were obtained in terms of the condition.

讨论了区间系统的鲁棒稳定性和鲁棒镇定性的有限检验问题，给出了线段多项式鲁棒稳定性的充分必要条件，利用该条件对多项式多面体鲁棒稳定性和区间系统鲁棒镇定性进行了有限检验，并给出了相应的检验结果。

For reflecting a basic circumstance of the forest resources management and the ecosystem variety completely, monitoring of the forest health condition strengtheningly, and realizing the comprehensive evaluation of the forest resources and the ecosystem condition,it is necessary to building up an efficient, convenient information service system in the forestry section.

为了全面反映森林资源管理和生态变化的基本情况，加大对森林健康状况的监测，实现对森林资源和生态状况的综合评价，需要在林业部门建立一套高效、便捷的信息服务系统。

Mark J1C at theintersection of the two lines.It is necessary to use a new standard specimen to do J-integral test. The dimension of standard specimen is 10 mnx20 nsnxiOO mm .The results from this specimen are satisfied with the condition of validness of J-integral as well as the condition of plane-strain. The reason is explained.

通过对J积分测试中的有效性条件及平面应变条件的分析，提出用尺寸为10mm×20mm×100mm的试样作为标准试样进行J积分试验，该试样既能满足有效性条件又能满足平面应变条件，并解释了其原因。

On the basis of numeral material and field investigations, this paper analyses the natural condition of cultivated land, social and economic condition of cultivated land, stages of cultivated land utilization, productive potentiality of cultivated land, and studies on the agriculture with regional features, intensive faming of cultivated land, a grand gathering of faming, plan faming, taking part in WTO, witch tightly related to the necessary and important of quality utilization of cultivated land.

本研究在大量收集资料和实地调查的基础上，对福建省耕地利用的自然条件、社会和经济条件、耕地利用阶段、耕地生产潜力等进行分析研究。从特色农业、耕地集约经营与规模经营、耕地计划利用、加入WTO等方面探索耕地优化利用的必要性和重要性，寻找适合福建省不同区域耕地优化利用的途径，提出区域耕地优化利用的模式。

Firstly,capitalist system and highly industrialized societyhas human survival been confronted with fearful challenge,globally ecological crisisconstituted the realistic condition of the engendering and development of"Eco-socialism";Secondly,it is a theory modality and practice format which is more than one century sinceworld socialist movement in developed countries carried through considering andexceeding;Lastly,human being has been stepping"Eco-civilization",natural science andliteral humanities has intercrossed,the synthesizing of ecology and socialist theory becamethe scientific and technological background of the engendering of"Eco-socialism","greenpolitics"and ecological movement became a necessary and realistic condition.

首先，资本主义制度和高度工业化的社会使人类自身的生存面临着严重的挑战，全球性的生态危机构成了生态社会主义产生与发展的最为现实的历史条件；其次，它是一个多世纪以来世界社会主义运动在二十世纪末期这个特定的历史时刻出现的一种理论形态和实践形式，它是发达国家社会主义运动进行自我反思和超越的理论结果；再次，人类正在步入&生态文明&，自然科学和人文科学的交叉、生态科学和社会主义思想的结合成为生态社会主义产生的科技和人文背景，&绿色政治&和生态运动又成为生态社会主义产生和发展的一个必要的现实条件。

Via basic and descriptor adverse transformation of matrix, an equivalent standard linear system is derived. Sufficient and necessary conditions are established for observers with disturbance decoupling and LTR in systems. Analysis showed that the necessary and sufficient condition for observers with LTR is disturbance decoupling to any undnown inputs. So it is con verted to the problem that observers are designed with disturbance decoupling.

通过矩阵的初等变换和广义逆变换，将非方广义系统等价地转化为正常状态空间的广义线性系统，并运用有关定理给出观测器具有干扰解耦和环路复现特性的充要条件，经分析可知，系统具有环路复现特性的充要条件是系统对于任何未知输入干扰解耦，则具有环路复现特性的干扰解耦观测器的设计问题转化为系统关于任何扰动都是解耦的。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。