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天然气稳态运行优化问题的难点在于网络结构复杂、规模大、目标函数及约束高度非线性. 针对其混合整数非线性规划模型, 基于网络约简和线性化技术, 建立了线性近似模型, 并提出一种新的求解算法. 将新算法用于优化我国西部天然气管网系统, 结果表明所提算法是有效的.
对在正对称Pratt 桁架中出现的直腹杆受压大偏心N 型圆钢管节点的静力性能进行了单调加载的实验研究。实施了4 个负向大偏心、4个正向大偏心和1个无偏心直腹杆受压N型圆钢管节点实验。该文介绍了节点实验方案,考察了直腹杆受压大偏心圆钢管节点破坏现象,给出了竖向荷载-端位移曲线以及应变强度分布曲线,并将偏心率对节点极限承载力、刚度和延性的影响进行了讨论。实验研究结果表明:节点实验值基本接近刚接理论值,...
This paper deals with the veri cation and the synthesis of polytopic invariant sets for polynomial dynamical systems. An invariant set of a dynamical system is a subset of the state space such that ...
Let f be a homeomorphism of the closed annulus A isotopic to the identity, and let X  IntA be an f-invariant continuum which separates A into two domains, the upper domain U+ and the lower domain U&#...
Изучаются особые периодические движения (критические точки ранга 1 интегрально- го отображения), найденные в работе М.П.Харламова (Механика твердого тела, вып. 37, 2007) в интегрируемой задаче о дви...
We propose a system of ordinary differential equations which defines Jacobi’s theta-constant series. The relations of this system to the classical Darboux–Halphen equations and equations introduced by...
We present a model of synchronization in networks of autonomous agents where the topology changes due to agents motion. We introduce two time scales, one for the topological change and another one f...
In this paper we analyze the quasi-stationary workload of a L´evy-driven storage system. More precisely, assuming the system is in stationarity, we study its behavior conditional on the event t...
Generating sets for closed surfaces are either reducible or Nielsen equivalent to a standard generating set.
We use semigroup theory to describe the group of automorphisms of some semigroups of interest in holomorphic dynamical systems. We show,with some examples, that representation theory of semigroups is ...
Whereas it is easy to reduce the translational symmetry of a molecular system by using, e.g., Jacobi coordinates the situation is much more involved for the rotational symmetry.
We show that the integer quantum Hall effect systems in plane, sphere or disc, can be formulated in terms of an algebraic unified scheme. This can be achieved by making use of a generalized Weyl–Heise...
We prove that, under certain conditions, uniform weak mixing (to zero)of the bounded sequences in Banach space implies uniform weak mixing of its tensor product. Moreover, we prove that ergodicity of ...
We obtain two-sided bounds on kinetic and potential energies of a bound state of a quantum particle in the semiclassical limit, as the Planck constant ~ ! 0. Proofs of these results rely on the genera...
We prove existence of solution of a p-curl type evolutionary system arising in electromagnetism with a power nonlinearity of order p, 1 < p < 1,assuming natural tangential boundary conditions. We cons...

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