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Existence of weak solutions for a $p(x)$-Laplacian equation via topological degree p(x) -拉普拉斯方程的拓扑度弱解的存在性
IF 0.4 Q3 Mathematics Pub Date : 2022-05-01 DOI: 10.35634/2226-3594-2022-59-02
M. Ait Hammou, E. Rami
We consider the $p(x)$-Laplacian equation with a Dirichlet boundary value condition $$ begin{cases} -Delta_{p(x)}(u)+|u|^{p(x)-2}u= g(x,u,nabla u), &xinOmega, u=0, &xinpartialOmega. end{cases} $$ Using the topological degree constructed by Berkovits, we prove, under appropriate assumptions, the existence of weak solutions for this equation.
考虑具有Dirichlet边值条件的$p(x)$ - laplace方程$$ begin{cases} -Delta_{p(x)}(u)+|u|^{p(x)-2}u= g(x,u,nabla u), &xinOmega, u=0, &xinpartialOmega. end{cases} $$,利用Berkovits构造的拓扑度,在适当的假设下,证明了该方程弱解的存在性。
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引用次数: 0
The Savage principle and accounting for outcome in single-criterion nonlinear problem under uncertainty 不确定单准则非线性问题的Savage原理及结果的计算
IF 0.4 Q3 Mathematics Pub Date : 2022-05-01 DOI: 10.35634/2226-3594-2022-59-03
V. Zhukovskiĭ, L. Zhukovskaya, S. P. Samsonov, L. Smirnova
In the middle of the last century the American mathematician and statistician professor of Michigan University Leonard Savage (1917-1971) and the well-known economist, professor of Zurich University (Switzerland) Jurg Niehans (1919-2007) independently from each other suggested the approach to decision-making in one-criterion problem under uncertainty (OPU), called the principle of minimax regret. This principle along with Wald principle of guaranteed result (maximin) is playing the most important role in guaranteed under uncertainty decision-making in OPU. The main role in the principle of minimax regret is carrying out the regret function, which determines the Niehans-Savage risk in OPU. Such risk has received the broad extension in practical problems during last years. In the present article we suggest one of possible approaches to finding decision in OPU from the position of a decision-maker, which simultaneously tries to increase the payoff (outcome) and to reduce the risk (i.e., “to kill two birds with one stone in one throw”). As an application, an explicit form of such a solution was immediately found for a linear-quadratic variant of the OPU of a fairly general form.
上世纪中叶,美国密歇根大学数学家、统计学家Leonard Savage教授(1917-1971)和著名经济学家、瑞士苏黎世大学教授Jurg Niehans(1919-2007)分别提出了不确定条件下单准则问题(OPU)的决策方法,称为极大极小后悔原则。该原理与沃尔德保证结果(最大值)原理在OPU不确定条件下的保证决策中起着重要的作用。极小极大后悔原则的主要作用是执行后悔函数,该函数决定了OPU中的Niehans-Savage风险。近年来,这种风险在实际问题中得到了广泛的推广。在本文中,我们从决策者的角度提出了一种寻找OPU决策的可能方法,这种方法同时试图增加收益(结果)并降低风险(即“一箭双雕”)。作为一种应用,对于一般形式的OPU的线性二次变量,立即找到了这种解的显式形式。
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引用次数: 0
One task of routing jobs in high radiation conditions 在高辐射条件下布线作业的一个任务
IF 0.4 Q3 Mathematics Pub Date : 2021-11-01 DOI: 10.35634/2226-3594-2021-58-06
A. G. Chentsov, A. Chentsov, A. Sesekin
The problem of sequential bypass of megalopolises is investigated, focused on the problem of dismantling a system of radiation hazardous objects under constraints in the form of precedence conditions. The radiation impact on the performers is assessed by the doses received during movements and during the performance of dismantling works. The route problem of minimizing the dose load of workers carrying out dismantling in one or another sequence of operations is considered. The procedure for constructing an optimal solution using a variant of dynamic programming is investigated. On this basis, an algorithm is built, implemented on a PC. Examples of the numerical solution of a model problem for the minimum dose load are given.
研究了特大城市的顺序绕过问题,重点讨论了在优先条件形式的约束下拆除辐射危险物体系统的问题。对表演者的辐射影响是根据他们在移动和拆卸工作期间所受的剂量来评估的。考虑了在一种或另一种作业顺序中使拆除工人的剂量负荷最小化的路线问题。研究了用动态规划的一种变体构造最优解的过程。在此基础上,建立了一个算法,并在PC上实现。给出了最小剂量负荷模型问题数值解的实例。
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引用次数: 0
On a discrete game problem with non-convex control vectograms 一类具有非凸控制向量的离散博弈问题
IF 0.4 Q3 Mathematics Pub Date : 2021-11-01 DOI: 10.35634/2226-3594-2021-58-03
I. V. Izmestyev, V. I. Ukhobotov
In a normed space of finite dimension, a discrete game problem with fixed duration is considered. The terminal set is determined by the condition that the norm of the phase vector belongs to a segment with positive ends. In this paper, a set defined by this condition is called a ring. At each moment, the vectogram of the first player's controls is a certain ring. The controls of the second player at each moment are taken from balls with given radii. The goal of the first player is to lead a phase vector to the terminal set at a fixed time. The goal of the second player is the opposite. In this paper, necessary and sufficient termination conditions are found, and optimal controls of the players are constructed.
在有限维的赋范空间中,研究了一类具有固定持续时间的离散博弈问题。终端集由相向量的范数属于端为正的段的条件确定。在本文中,由这个条件定义的集合称为环。在每个时刻,第一个玩家的控制向量是一个特定的环。第二名球员在每个时刻的控制都来自给定半径的球。第一个玩家的目标是在固定时间将相位矢量引入终端集。第二个玩家的目标正好相反。本文找到了终止的充分必要条件,构造了参与者的最优控制。
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引用次数: 0
On the construction of resolving control in the problem of getting close at a fixed time moment 论在固定时刻接近问题中解决控制的构建
IF 0.4 Q3 Mathematics Pub Date : 2021-11-01 DOI: 10.35634/2226-3594-2021-58-05
V. Ushakov, A. Ushakov, O. Kuvshinov
The problem of getting close of a controlled system with a compact space in a finite-dimensional Euclidean space at a fixed time is studied. A method of constructing a solution to the problem is proposed which is based on the ideology of the maximum shift of the motion of the controlled system by the solvability set of the getting close problem.
研究了有限维欧氏空间中具有紧致空间的被控系统在固定时间的逼近问题。基于被控系统运动最大位移的思想,利用逼近问题的可解集,提出了一种构造该问题解的方法。
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引用次数: 0
On the route construction in changing environments using solutions of the eikonal equation 利用eikonal方程解研究变化环境下的路线建设
IF 0.4 Q3 Mathematics Pub Date : 2021-11-01 DOI: 10.35634/2226-3594-2021-58-04
A. Kazakov, A. Lempert
The article deals with the vehicle routing problem in an environment with dynamically changing properties. The problem is relevant in current conditions when the delivery cost has a steady upward trend and is often comparable to the cost of the product itself. A central feature of the study is that the optimality criterion is the minimum delivery time, but not the distance traveled. The optical-geometric approach developed by the authors, based on the analogy between the propagation of light in an optically inhomogeneous medium and the minimization of the integral functional, is used as a research tool. We use exact and approximate solutions of the eikonal equations to describe wave fronts. Two original numerical algorithms for route construction are proposed and implemented as software. A computational experiment is performed that justified the effectiveness of the proposed model-algorithmic tools.
本文研究了动态变化环境下的车辆路径问题。这个问题在目前的情况下是相关的,因为交货成本有稳定上升的趋势,而且往往与产品本身的成本相当。该研究的一个中心特征是,最优性准则是最短交货时间,而不是行驶距离。基于光在光学非均匀介质中的传播与积分泛函的最小化之间的类比,作者开发的光学几何方法被用作研究工具。我们用eikonal方程的精确解和近似解来描述波前。提出了两种原始的路线构建数值算法,并以软件形式实现。计算实验证明了所提出的模型算法工具的有效性。
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引用次数: 0
A method for estimating the statistical error of the solution in the inverse spectroscopy problem 反演光谱问题解的统计误差估计方法
IF 0.4 Q3 Mathematics Pub Date : 2021-11-01 DOI: 10.35634/2226-3594-2021-58-01
T. M. Bannikova, V. Nemtsov, N. Baranova, G. Konygin, O. Nemtsova
A method for obtaining the interval of statistical error of the solution of the inverse spectroscopy problem, for the estimation of the statistical error of experimental data of which the normal distribution law can be applied, has been proposed. With the help of mathematical modeling of the statistical error of partial spectral components obtained from the numerically stable solution of the inverse problem, it has become possible to specify the error of the corresponding solution. The problem of getting the inverse solution error interval is actual because the existing methods of solution error evaluation are based on the analysis of smooth functional dependences under rigid restrictions on the region of acceptable solutions (compactness, monotonicity, etc.). Their use in computer processing of real experimental data is extremely difficult and therefore, as a rule, is not applied. Based on the extraction of partial spectral components and the estimation of their error, a method for obtaining an interval of statistical error for the solution of inverse spectroscopy problems has been proposed in this work. The necessity and importance of finding the solution error interval to provide reliable results is demonstrated using examples of processing Mössbauer spectra.
提出了一种求光谱反演问题解的统计误差区间的方法,用于估计适用正态分布规律的实验数据的统计误差。借助对反问题数值稳定解得到的部分谱分量统计误差的数学建模,可以指定相应解的误差。由于现有的解误差评价方法是基于对可接受解区域(紧性、单调性等)的光滑泛函依赖性的分析,因此求逆解误差区间的问题是实际存在的。它们在计算机处理真实实验数据时极为困难,因此通常不应用。本文在提取部分光谱分量及其误差估计的基础上,提出了一种反演光谱问题统计误差区间的计算方法。通过处理Mössbauer光谱的实例,说明了找出解误差区间以提供可靠结果的必要性和重要性。
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引用次数: 0
On the spectrum of a multidimensional periodic magnetic Shrödinger operator with a singular electric potential 具有奇异电位的多维周期磁Shrödinger算子的谱
IF 0.4 Q3 Mathematics Pub Date : 2021-11-01 DOI: 10.35634/2226-3594-2021-58-02
L. I. Danilov
We prove absolute continuity of the spectrum of a periodic $n$-dimensional Schrödinger operator for $ngeqslant 4$. Certain conditions on the magnetic potential $A$ and the electric potential $V+sum f_jdelta_{S_j}$ are supposed to be fulfilled. In particular, we can assume that the following conditions are satisfied.(1) The magnetic potential $Acolon{mathbb{R}}^nto{mathbb{R}}^n$ either has an absolutely convergent Fourier series or belongs to the space $H^q_{mathrm{loc}}({mathbb{R}}^n;{mathbb{R}}^n)$, $2q>n-1$, or to the space $C({mathbb{R}}^n;{mathbb{R}}^n)cap H^q_{mathrm{loc}}({mathbb{R}}^n;{mathbb{R}}^n)$, $2q>n-2$.(2) The function $Vcolon{mathbb{R}}^ntomathbb{R}$ belongs to Morrey space ${mathfrak{L}}^{2,p}$, $pin big(frac{n-1}{2},frac{n}{2}big]$, of periodic functions (with a given period lattice), and$$limlimits_{tauto+0}suplimits_{00$ centered at a point $xin{mathbb{R}}^n$, $B^n_r=B^n_r(0)$, $v(B^n_r)$ is volume of the ball $B^n_r$, $C=C(n,p;A)>0$.(3) $delta_{S_j}$ are $delta$-functions concentrated on (piecewise) $C^1$-smooth periodic hypersurfaces $S_j$, $f_jin L^p_{mathrm{loc}}(S_j)$, $j=1,ldots,m$. Some additional geometric conditions are imposed on the hypersurfaces $S_j$, and these conditions determine the choice of numbers $pgeqslant n-1$. In particular, let hypersurfaces $S_j$ be $C^2$-smooth, the unit vector $e$ be arbitrarily taken from some dense set of the unit sphere $S^{n-1}$ dependent on the magnetic potential $A$, and the normal curvature of the hypersurfaces $S_j$ in the direction of the unit vector $e$ be nonzero at all points of tangency of the hypersurfaces $S_j$ and the lines ${x_0+tecolon tinmathbb{R}}$, $x_0in{mathbb{R}}^n$. Then we can choose the number $p>frac{3n}{2}-3$, $ngeqslant 4$.
证明了周期$n$维Schrödinger算子对于$n geqslant4 $的谱的绝对连续性。假定磁势A和电势V+sum f_jdelta_{S_j}$满足一定条件。特别地,我们可以假设满足以下条件:(1)磁势$A冒号{mathbb{R}}^n到{mathbb{R}}^n$具有绝对收敛的傅里叶级数或属于$H^q_{ mathbb{loc}}({mathbb{R}}^n;{mathbb{R}}^n)$空间,$2q>n-1$,或属于$C({mathbb{R}}^n;{mathbb{R}}^n) $空间,$2q>n-2$。(2)函数$V冒号{mathbb{R}}^n到mathbb{R}} $属于Morrey空间${mathfrak{L}}^ 2,p}$,$pin big(frac{n-1}{2},frac{n}{2}big]$,和$$limlimits_{tau到+0}suplimits_{00$,中心在点$xin{mathbb{R}}^n$, $B^n_r=B^n_r(0)$, $v(B^n_r)$是球的体积$B^n_r$, $C=C(n,p; a)>0$.(3) $delta_{S_j}$是$delta$-函数集中在(分段)$ C^1$-光滑周期超曲面$S_j$, $f_jin L^p_{math_m {loc}}(S_j)$, $j=1, $ ldots,m$。在超曲面$S_j$上附加了一些几何条件,这些条件决定了数字$pgeqslant n-1$的选择。特别地,设超曲面$S_j$是$C^2$-光滑的,单位向量$e$从单位球$S^{n-1}$的依赖于磁势$A$的密集集合中任意取,并且超曲面$S_j$在单位向量$e$方向上的法曲率$S_j$与线${x_0+t In mathbb{R} $, $x_0 In {mathbb{R}}}^n$的所有切点处都是非零的。然后我们可以选择数字$p>frac{3n}{2}-3$, $ngeqslant 4$。
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引用次数: 1
Numerical method for fractional diffusion-wave equations with functional delay 具有泛函时滞的分数阶扩散波方程的数值方法
IF 0.4 Q3 Mathematics Pub Date : 2021-05-01 DOI: 10.35634/2226-3594-2021-57-07
V. Pimenov, E. Tashirova
For a fractional diffusion-wave equation with a nonlinear effect of functional delay, an implicit numerical method is constructed. The scheme is based on the L2-method of approximation of the fractional derivative of the order from 1 to 2, interpolation and extrapolation with the given properties of discrete prehistory and an analogue of the Crank-Nicolson method. The order of convergence of the method is investigated using the ideas of the general theory of difference schemes with heredity. The order of convergence of the method is more significant than in previously known methods, depending on the order of the starting values. The main point of the proof is the use of the stability of the L2-method. The results of comparing numerical experiments with other schemes are presented: a purely implicit method and a purely explicit method, these results showed, in general, the advantages of the proposed scheme.
对于一类具有非线性泛函时滞效应的分数阶扩散波方程,构造了一种隐式数值方法。该方案基于1到2阶分数阶导数的l2逼近方法、具有离散史前性质的内插和外推以及类似的Crank-Nicolson方法。利用具有遗传的差分格式的一般理论,研究了该方法的收敛阶。该方法的收敛顺序比以前已知的方法更重要,这取决于起始值的顺序。证明的要点是利用l2法的稳定性。给出了与其他格式的数值实验结果:纯隐式方法和纯显式方法,这些结果表明,总的来说,该格式的优点。
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引用次数: 0
Spectrum assignment in linear systems with several commensurate lumped and distributed delays in state by means of static output feedback 基于静态输出反馈的具有若干相应集中和分布状态延迟的线性系统的频谱分配
IF 0.4 Q3 Mathematics Pub Date : 2020-11-01 DOI: 10.35634/2226-3594-2020-56-01
V. Zaitsev, I. G. Kim
A linear control system defined by a stationary differential equation of nth order with several commensurate lumped and distributed delays in state is considered. In the system, the input is a linear combination of m variables and their derivatives of order not more than n−p and the output is a k-dimensional vector of linear combinations of the state and its derivatives of order not more than p−1. For this system, a spectrum assignment problem by linear static output feedback with commensurate lumped and distributed delays is studied. Necessary and sufficient conditions are obtained for solvability of the arbitrary spectrum assignment problem by static output feedback controller. Corollaries on stabilization of the system are obtained.
研究一类由n阶平稳微分方程定义的线性控制系统,该系统具有若干相称的状态集总时滞和分布时滞。在系统中,输入是m个变量及其导数阶数不大于n−p的线性组合,输出是状态及其导数阶数不大于p−1的k维向量的线性组合。针对该系统,研究了具有相应集总延迟和分布延迟的线性静态输出反馈的频谱分配问题。得到了静态输出反馈控制器可解任意频谱分配问题的充分必要条件。得到了系统稳定性的一些推论。
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引用次数: 2
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Izvestiya Instituta Matematiki i Informatiki-Udmurtskogo Gosudarstvennogo Universiteta
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