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天然气稳态运行优化的混合整数模型及其算法
天然气管网运行优化 混合整数非线性规划 线性化 混合整数线性规划
2018/3/12
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，...
Polytopic Invariant Verification and Synthesis for Polynomial Dynamical Systems via Linear Programming
Polytopic Invariant Verification Synthesis for Polynomial Dynamical Systems Linear Programming
2011/1/18
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 ...
Prime end rotation numbers of invariant separating contunua of annular homeomorphisms
continuum rotation set prime end rotation number Brouwer line
2011/1/18
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&#...
The existence conditions for periodic motions of the Kowalevski gyrostat in double force field
periodic motions Kowalevski gyrostat double force field
2010/12/28
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...
A note on dynamical systems defining Jacobi's theta-constants
Jacobi’s theta-constants modular forms Poisson structures
2011/1/19
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...
Synchronization in networks of mobile oscillators
Synchronization networks of mobile oscillators
2010/12/28
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...
Quasi-stationary workload in a Lévy-driven storage system
L´ evy processes storage systems quasi-stationary distribution Laplace transforms
2011/1/21
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...
Nielsen equivalence of generating sets for closed surface groups
Nielsen equivalence of generating sets closed surface groups
2010/11/29
Generating sets for closed surfaces are either reducible or Nielsen equivalent to a standard generating set.
Semigroup representations in holomorphic dynamics
Semigroup representations holomorphic dynamics
2010/12/7
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 ...
Holonomy reduced dynamics of triatomic molecular systems
Holonomy reduced dynamics triatomic molecular systems
2010/11/29
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.
Symplectic Fluctuations for Electromagnetic Excitations of Hall Droplets
Symplectic Fluctuations Electromagnetic Excitations Hall Droplets
2010/12/15
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...
On tensor products of weak mixing vector sequences and their applications to C*-dynamical systems
Uniform weak mixing weak mixing ergodicity
2010/11/29
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 ...
A generalized virial theorem and the balance of kinetic and potential energies in the semiclassical limit
Virial theorem semiclassical limit classically forbidden region
2010/12/1
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...
On a p-curl system arising in electromagnetism
Electromagnetic problems variational methods variational inequali-ties superconductivity models
2010/11/29
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...