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On the basis of the conclusion above, the nonlinear weak controllable vectors can be obtained, which compose the second class of weak controllable matrix, by means of matrix transfermations of the first class of weak controllable matrix. Furthmore the second criterion of weak controllability, accessibility and strong accessibility, which is more standard, more succinct and more practical, is obtained. On the basis of the first criterion and the second criterion, several important problems about nonlinear controllability are discussed, which include 1 local controllability; 2 three classes of local controllable decomposition, separately by means of local coordinate changes in the neighborhood of a nonsingular point, a point on a singular surface or a designated point x〓 with a designated input u〓; 3 the character of controllability of the ith state variable x〓 in different controllable areas and their boundaries.
在第一判别定理和第二判别定理的基础上,我们分析了非线性系统受控性质中的几个重要问题,所得到的结论包括i得到了非线性系统在可平衡点附近的能控性判别定理;ii分别给出了非线性系统在非奇异点、s阶奇面以及在状态空间内给定的一点x〓和输入u〓上的三种状态分解形式以及相应的求解方法;利用系统的Ⅰ型弱能控矩阵与Ⅱ型弱能控矩阵秩相等的条件,得到了只用系统的前n个弱能控向量来判断系统的弱能控性的判别定理;iii通过引入系统状态分量的三类受控区域边界的定义及相应的求解方法,初步探讨了非线性系统各个状态分量在不同的受控区域及其边界上的受控性质。
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The second chapter is the main part of this paper, in which the formulation of the Riemann boundary value problem of non-normal type on the real axis, the solution method of homogeneous problem, the relation between the two kinds of different derivatives and the inhomogeneous problem will be thoroughly given. In this paper, the solution and the solvability of the Riemann boundary value problem of non-normal type on the real axis will be given. Furthermore, it is shown that the twokinds of derivatives of the function Ψ are existing and equivalent in the case ofthe solution about the original problem, therefore, we get uniformly Hermite interpolatory polynomial. The relation between the two kinds of different derivativesof the function Ψ are similar for smooth closed contours by means of the same proof.
第二章是本文的主要部分,分别给出了实轴上一类非正则型Riemann边值问题的提法、齐次问题的解法、两种导数的关系及非齐次问题的求解,本文运用杜金元教授[11]的方法获得了实轴上非正则型Riemann边值问题的封闭解及可解性条件,且在问题可解的情况下论证了函数Ψ的非切向极限导数和Peano导数存在且相等,从而获得了统一的Hermite插值多项式,同样关于封闭曲线上非正则型Riemann边值问题,采用本文论证方法证得了函数Ψ的非切向极限导数和Peano导数存在且相等,从而较好地统一了[10]、[11]中的Hermite插值多项式。
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Type IB: Isocline is convergent towards inner arc at a right angle to the fold.
根据等斜线的收敛层度,再细分为三个亚型:IA型:等弧线向内弧强烈收敛,各线长短判别极大,内弧曲率远大于外弧曲率,为典型的顶薄褶皱;IB型:等倾斜线向内弧收敛,并与褶皱面垂直,各线长短大致相等,褶皱层真厚度不变,内弧曲率仍大于外弧曲率,为典型的平行褶皱;IC型:等斜线相内弧轻微收敛,转折端等倾斜线比两翼附近的要略长一些,反应两翼厚度有变薄的趋势,内弧曲率略大于外弧曲率。
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Objective To study the treatment of V pattern caused by unequal bilateral overaction of the inferior oblique.
目的探讨由不相等的下斜肌亢进引起的V型斜视的治疗。
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In the formulas of stochastic input and output, when the coefficient of direct consumption and final demand are exponentially distributed, the interrelationship between parameters of stochastic variables can be divided into three types: all the parameters are the same; parameters are inequivalent to each other; some of the parameters are the same, but the rest are inequivalent to each other.
在随机投入产出方程中,当直接消耗系数和最终需求为指数型随机变量时,方程中随机变量分布中参数间的关系有3种基本情况:所有参数都相等、所有参数两两不相等、有部分相等而其余则两两不相等。实际上,前2种情况是第3种情况的特殊形式。
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Distribution of an ionizable drug across a membrane at equilibrium is determined by the drug's pKa (the pH at which concentrations of un-ionized and ionized forms of the drug are equal) and the pH gradient, when present.
一种能解离的药物透过生物膜到达分布平衡取决于药物的pKa(药物的非解离型和解离型浓度相等时的pH)和当时的pH梯度。
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Distribution of an ionizable drug acro a membrane at equilibrium is determined by the drug's pKa (the pH at which concentratio of un-ionized and ionized forms of the drug are equal) and the pH gradient, when present.
一种能解离的药物透过生物膜到达分布平衡取决于药物的pKa(药物的非解离型和解离型浓度相等时的pH)和当时的pH梯度。
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In functional programming,equality function is a very common operator for comparing two values of the same data type,we use this concrete example to explain the basic method of constrcuting generic programs and polytypic values.
本文以相等函数为例阐述了泛型程序设计的基本方法,并利用直积和直和给出了构造多型值的方法。
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Firstly,based on the WR Sexton method,the method and mathematic models of supplementing the sub-idle rotating component characteristics is presented.Secondly,the turbofan windmilling high-low pressure rotor co-working equations and the whole engine co-working equations are established.lastly,a turbofan engine windmilling characteristics under various windmilling conditions are simulated and analyzed.
首先,基于不可压流理论,附以可压缩效应修正的指数法发展了补充慢车转速以下部件特性的计算模型和计算程序;其次,根据流量连续、压力平衡、功率平衡、燃烧室进出口总温相等及转速相等等约束条件建立了风车状态时涡扇发动机高低压转子及整机的共同工作方程;最后发展了具有一定计算精度的涡扇发动机风车状态特性计算模型和程序,并以某型涡扇发动机为例,计算分析了不同飞行条件下发动机的风车特性,从计算结果看,其趋势是合理的。
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This kind of configuration suits the multi-nucleotide chain's purine pyrimidine alternate area. in 1989, the American scientists with scanning tunnel electron microscope law visual observation double helix DNA double helix DNA ︰ in 1952, Austrian lineage US biology chemist Zha Qiefu (E.chargaff,1905-) have determined in DNA 4 kind of basic group content, the discovery gland fat ling and thymine quantity are equal, the bird fat ling and cytosine quantity is equal.
这种构型适合多核苷酸链的嘌呤嘧啶交替区。1989年,美国科学家用扫描隧道电镜法直接观察到双螺旋DNA 双螺旋DNA︰1952年,奥地利裔美国生物化学家查伽夫(E.chargaff,1905—)测定了DNA中4种碱基的含量,发现其中腺膘呤与胸腺嘧啶的数量相等,鸟膘呤与胞嘧啶的数量相等。
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counterturn:相反转向
countertide 逆潮 | counterturn 相反转向 | countertype 相等型
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counterturn:相反转向, 逆转
countertube | 计数管, 电子计数管, 定标管 | counterturn | 相反转向, 逆转 | countertype | 相等型, 相等物
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countertype:相等型
counterturn 相反转向 | countertype 相等型 | countervail 补偿
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countertype:相等型, 相等物
counterturn | 相反转向, 逆转 | countertype | 相等型, 相等物 | countervail duty | 报复税
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countervail duty:报复税
countertype | 相等型, 相等物 | countervail duty | 报复税 | countervail | 补偿, 抵销 抵销
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Directional:方向性
以偶极天线的水平面场型来看,电磁波强度在任意方向上都相等,这就是所谓的全向性(Omni-directional)辐射场型;但在垂直面场型中,电磁波强度则是在θ 等于90 度的方向上有最大值,是属于具有方向性(Directional)的辐射场型.
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SASA:赤竹属
箬竹属(Indocalamus)、赤竹属(Sasa)等的竹种属单枝型,竹秆每节仅有1枚主枝. 其粗度几乎与竹秆相等. 刚竹属(Phyllostachys)的竹种则为双枝型,每节有2枚主枝. 唐竹属(Sinobambusa)和大节竹属(Indosasa)等的竹种为3枝型,每节有3枚主枝.
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enumerators:列举元(enum型别中的成员) 枚举成员、枚举器
enclosing class 外围类别(与巢状类别 nested class有关) 外围类 | enumerators 列举元(enum型别中的成员) 枚举成员、枚举器 | equal 相等 相等
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enumerators:列举元(enum 型别中的成员) 枚举成员、枚
enclosing class 外围类别(与巢状类别 nested class 有关)外围类 | enumerators 列举元(enum 型别中的成员) 枚举成员、枚 | equal 相等 相等
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enumerators:列举元(enum 型别中的员) 枚举员、枚举器
enclosing class 外围类别(与巢状类别 nested class 有关)外围类 | enumerators 列举元(enum 型别中的员) 枚举员、枚举器 | equal 相等 相等