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Andreev reflection in the p-wave superconductor–normal metal contact p波超导体-正常金属接触中的Andreev反射
IF 0.4 Q4 MATHEMATICS Pub Date : 2019-11-01 DOI: 10.20537/2226-3594-2019-54-05
T. Tinyukova, Y. Chuburin
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引用次数: 2
Spectral singularities of solutions to a boundary-value problem for the Fredholm integro-differential equation of the second order with reflection of argument 具有参数反射的二阶Fredholm积分微分方程边值问题解的谱奇异性
IF 0.4 Q4 MATHEMATICS Pub Date : 2019-11-01 DOI: 10.20537/2226-3594-2019-54-09
T. Yuldashev
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引用次数: 1
On one addition to evaluation by L. S. Pontryagin of the geometric difference of sets in a plane 关于L. S.评价的一个补充。平面上集合的几何差的庞特里亚金
IF 0.4 Q4 MATHEMATICS Pub Date : 2019-11-01 DOI: 10.20537/2226-3594-2019-54-06
V. Ushakov, A. Ershov, M. Pershakov
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引用次数: 1
On a problem related to second-order Diophantine equations 关于二阶丢番图方程的一个问题
IF 0.4 Q4 MATHEMATICS Pub Date : 2019-11-01 DOI: 10.20537/2226-3594-2019-54-03
A. Lipin
{"title":"On a problem related to second-order Diophantine equations","authors":"A. Lipin","doi":"10.20537/2226-3594-2019-54-03","DOIUrl":"https://doi.org/10.20537/2226-3594-2019-54-03","url":null,"abstract":"","PeriodicalId":42053,"journal":{"name":"Izvestiya Instituta Matematiki i Informatiki-Udmurtskogo Gosudarstvennogo Universiteta","volume":"262 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86134731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the continuous dependence on the parameter of the set of solutions of the operator equation 算子方程解集参数的连续依赖性
IF 0.4 Q4 MATHEMATICS Pub Date : 2019-11-01 DOI: 10.20537/2226-3594-2019-54-02
E. Zhukovskiy, W. Merchela
{"title":"On the continuous dependence on the parameter of the set of solutions of the operator equation","authors":"E. Zhukovskiy, W. Merchela","doi":"10.20537/2226-3594-2019-54-02","DOIUrl":"https://doi.org/10.20537/2226-3594-2019-54-02","url":null,"abstract":"","PeriodicalId":42053,"journal":{"name":"Izvestiya Instituta Matematiki i Informatiki-Udmurtskogo Gosudarstvennogo Universiteta","volume":"12 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73338945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Modality analysis of patterns in reaction-diffusion systems with random perturbations 随机扰动下反应扩散系统模式的模态分析
IF 0.4 Q4 MATHEMATICS Pub Date : 2019-07-05 DOI: 10.20537/2226-3594-2019-53-07
A. Kolinichenko, L. Ryashko
In this paper, a distributed Brusselator model with diffusion is investigated. It is well known that this model undergoes both Andronov-Hopf and Turing bifurcations. It is shown that in the parametric zone of diffusion instability the model generates a variety of stable spatially nonhomogeneous structures (patterns). This system exhibits a phenomenon of the multistability with the diversity of stable spatial structures. At the same time, each pattern has its unique parametric range, on which it may be observed. The focus is on analysis of stochastic phenomena of pattern formation and transitions induced by small random perturbations. Stochastic effects are studied by the spatial modality analysis. It is shown that the structures possess different degrees of stochastic sensitivity.
本文研究了一类具有扩散的分布Brusselator模型。众所周知,这个模型同时经历了Andronov-Hopf和Turing分岔。结果表明,在扩散不稳定的参数区,模型产生了多种稳定的空间非均匀结构(模式)。该系统表现出稳定空间结构多样性的多稳性现象。同时,每种模式都有其独特的参数范围,可以在该范围上观察到它。重点是分析由小的随机扰动引起的模式形成和转变的随机现象。通过空间模态分析研究了随机效应。结果表明,结构具有不同程度的随机敏感性。
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引用次数: 6
Structural theorem for gr-injective modules over gr-noetherian G-graded commutative rings and local cohomology functors g -noether g -梯度交换环和局部上同函子上的g -内射模的结构定理
IF 0.4 Q4 MATHEMATICS Pub Date : 2019-07-05 DOI: 10.20537/2226-3594-2019-53-11
Ли Лу
It is well known that the decomposition of injective modules over noetherian rings is one of the most aesthetic and important results in commutative algebra. Our aim is to prove similar results for graded noetherian rings. In this paper, we will study the structure theorem for $gr$-injective modules over $gr$-noetherian $G$-graded commutative rings, give a definition of the $gr$-Bass numbers, and study their properties. We will show that every $gr$-injective module has an indecomposable decomposition. Let $R$ be a $gr$-noetherian graded ring and $M$ be a $gr$-finitely generated $R$-module, we will give a formula for expressing the Bass numbers using the functor $Ext$. We will define the section functor $Gamma_{V}$ with support in a specialization-closed subset $V$ of $Spec^{gr}(R)$ and the abstract local cohomology functor. Finally, we will show that a left exact radical functor $F$ is of the form $Gamma_V$ for a specialization-closed subset $V$.
noether环上内射模的分解是交换代数中最重要的结果之一。我们的目标是证明分级诺etherian环的类似结果。本文研究了$gr$-noetherian $G$-梯度交换环上$gr$-内射模的结构定理,给出了$gr$-Bass数的定义,并研究了它们的性质。我们将证明每个$gr$内射模块都有一个不可分解的分解。设$R$是$gr$-noether阶环,$M$是$gr$-有限生成的$R$-模,我们将给出一个用函子$Ext$表示Bass数的公式。我们将定义区段函子$Gamma_{V}$,它支持$Spec^{gr}(R)$的专门化闭子集$V$和抽象局部上同函子。最后,我们将证明对于专门化闭子集$V$,左精确基函子$F$的形式为$Gamma_V$。
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引用次数: 0
On external estimates of reachable sets of control systems with integral constraints 具有积分约束的控制系统可达集的外部估计
IF 0.4 Q4 MATHEMATICS Pub Date : 2019-05-01 DOI: 10.20537/2226-3594-2019-53-06
I. Zykov
In this paper, we consider the problem of constructing external estimates of reachable sets as a level set of a certain differentiable Lyapunov-Bellman function (depending only on the state vector) for a control system with an integral control constraint. In particular, with its suitable choice, one can obtain ellipsoidal and rectangular estimates. The proposed constructions are based on integral estimates, the maximum solution, and the comparison principle for systems of differential inequalities. By using time in the arguments of the Lyapunov-Bellman function, it is possible to obtain more accurate estimates. In the linear nonstationary case, the latter can coincide with the set of reachability. A number of illustrative examples for nonlinear systems are given.
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引用次数: 1
Construction of a solution to a velocity problem in the case of violation of the smoothness of the curvature of the target set boundary 构造目标集边界曲率不光滑情况下速度问题的解
IF 0.4 Q4 MATHEMATICS Pub Date : 2019-05-01 DOI: 10.20537/2226-3594-2019-53-09
P. Lebedev, A. A. Uspenskii
For the development of analytical and numerical algorithms for constructing nonsmooth solutions of optimal control problems, procedures are proposed for constructing scattering curves for a single class of control velocity problems. We consider the reduction problems for a minimal time of solutions of a dynamical system with a circular velocity vectogram for the case where the target set is generally nonconvex, and its boundary has points at which the curvature smoothness is violated. These points are referred to as pseudovertices, the characteristic points of the target set, which are responsible for the occurrence of the singularity of the optimal result function. When forming a proper reparameterization (in this case, taking into account the geometry of the velocity vector diagram) of the arc of the boundary of the target set containing a pseudovertex, the scattering curve is constructed as an integral curve. Moreover, the initial conditions of the corresponding Cauchy problem are determined by the properties of the pseudovertex. One of the numerical characteristics of the pseudovertex, the pseudovertex marker, determines the initial velocity of the material point describing a smooth portion of the scattering curve. This approach to the identification and construction (in analytical or numerical form) of singular curves was previously substantiated for a number of cases of a target boundary that are different in the order of smoothness. It should be emphasized that the case considered in this paper is the most specific, in particular, because of the revealed connection between the dynamic problem and the problem of polynomial algebra. It is proved that the pseudovertex marker is the nonpositive root of some third-order polynomial whose coefficients are determined by the one-sided derivatives of curvatures of the pseudovertex of the target set. The effectiveness of the developed theoretical methods and numerical procedures is illustrated by specific examples.
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引用次数: 2
Resource efficient finite element computing on multicore architectures 基于多核架构的资源高效有限元计算
IF 0.4 Q4 MATHEMATICS Pub Date : 2019-05-01 DOI: 10.20537/2226-3594-2019-53-08
S. Kopysov, I. Kadyrov, A. Novikov
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引用次数: 1
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Izvestiya Instituta Matematiki i Informatiki-Udmurtskogo Gosudarstvennogo Universiteta
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