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Air Quality Estimation Using Nonhomogeneous Markov Chains: A Case Study Comparing Two Rules Applied to Mexico City Data
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作者 Eliane R. Rodrigues Juan A. Cruz-Juárez +1 位作者 Hortensia J. Reyes-Cervantes Guadalupe Tzintzun 《Journal of Environmental Protection》 2023年第7期561-582,共22页
A nonhomogeneous Markov chain is applied to the study of the air quality classification in Mexico City when the so-called criterion pollutants are used. We consider the indices associated with air quality using two re... A nonhomogeneous Markov chain is applied to the study of the air quality classification in Mexico City when the so-called criterion pollutants are used. We consider the indices associated with air quality using two regulations where different ways of classification are taken into account. Parameters of the model are the initial and transition probabilities of the chain. They are estimated under the Bayesian point of view through samples generated directly from the corresponding posterior distributions. Using the estimated parameters, the probability of having an air quality index in a given hour of the day is obtained. 展开更多
关键词 Air Quality Index Air Pollution Mexico City nonhomogeneous Markov Chains Bayesian Inference
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SOLUTIONS FOR A NONHOMOGENEOUS ELLIPTIC PROBLEM INVOLVING CRITICAL SOBOLEV-HARDY EXPONENT IN R^N 被引量:10
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作者 王征平 周焕松 《Acta Mathematica Scientia》 SCIE CSCD 2006年第3期525-536,共12页
For the following elliptic problem {-△u-μu/|x|^2=|u|^2^*(s)-2u/|x|^s+h(x), on R^N u∈D^1,2(R^N), N≥3, 0≤μ〈μ^-=(N-2)^2/4, 0≤s〈2, where 2^*(s)=2(N-s)/N-2 is the critical Sobolev-Hardy expon... For the following elliptic problem {-△u-μu/|x|^2=|u|^2^*(s)-2u/|x|^s+h(x), on R^N u∈D^1,2(R^N), N≥3, 0≤μ〈μ^-=(N-2)^2/4, 0≤s〈2, where 2^*(s)=2(N-s)/N-2 is the critical Sobolev-Hardy exponent, h(x) ∈ (D^1,2(R^N))^*, the dual space of (D^1,2(R^N)), with h(x)≥(≠)0. By Ekeland's variational principle, subsuper solutions and a Mountain Pass theorem, the authors prove that the above problem has at least two distinct solutions if ||h||*〈CN,sAs^N-s/4-2s(1-μ/μ)^1/2, CN,s=4-2s/N-2(N-2/N+2-2s)^N+2-2s/4-2s and As = inf u∈D^1,2(R^N)/{0}∫R^N(|△↓u|^2-μu^2/|x|^2)dx/(∫R^N|u|^2^*(s)/|x|^sdx)^2/2^*(s). 展开更多
关键词 Critical Sobolev-Hardy exponent elliptic equation Mountain Pass theorem subsuper solutions nonhomogeneous
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Nonhomogeneous(H,Q)-Process:The Backward and Forward Equations
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作者 陈柳鑫 李俊平 《Journal of Southeast University(English Edition)》 EI CAS 2002年第2期180-183,共4页
As for the backward and forward equation of nonhomogeneous(H, Q) -processes,we proof them in a new way. On the base of that, this paper gives the direct computational formalfor one dimensional distribution of the nonh... As for the backward and forward equation of nonhomogeneous(H, Q) -processes,we proof them in a new way. On the base of that, this paper gives the direct computational formalfor one dimensional distribution of the nonhomogeneous(H, Q) -process. 展开更多
关键词 nonhomogeneous(H Q)-process backward and forward equations one-dimensional distribution
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THE INVISCID AND NON-RESISTIVE LIMIT IN THE CAUCHY PROBLEM FOR 3-D NONHOMOGENEOUS INCOMPRESSIBLE MAGNETO-HYDRODYNAMICS 被引量:3
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作者 张剑文 《Acta Mathematica Scientia》 SCIE CSCD 2011年第3期882-896,共15页
In this paper,the inviscid and non-resistive limit is justified for the local-in-time solutions to the equations of nonhomogeneous incompressible magneto-hydrodynamics (MHD)in R3.We prove that as the viscosity and r... In this paper,the inviscid and non-resistive limit is justified for the local-in-time solutions to the equations of nonhomogeneous incompressible magneto-hydrodynamics (MHD)in R3.We prove that as the viscosity and resistivity go to zero,the solution of the Cauchy problem for the nonhomogeneous incompressible MHD system converges to the solution of the ideal MHD system.The convergence rate is also obtained simultaneously. 展开更多
关键词 3-D nonhomogeneous incompressible MHD ideal MHD inviscid and non-resistive limit local-in-time solution convergence rate
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THE CONVERGENCE OF NONHOMOGENEOUS MARKOV CHAINS IN GENERAL STATE SPACES BY THE COUPLING METHOD 被引量:1
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作者 Zhifeng ZHU Shaoyi ZHANG Fanji TIAN 《Acta Mathematica Scientia》 SCIE CSCD 2021年第5期1777-1787,共11页
We investigate the convergence of nonhomogeneous Markov chains in general state space by using the f norm and the coupling method,and thus,a sufficient condition for the convergence of nonhomogeneous Markov chains in ... We investigate the convergence of nonhomogeneous Markov chains in general state space by using the f norm and the coupling method,and thus,a sufficient condition for the convergence of nonhomogeneous Markov chains in general state space is obtained. 展开更多
关键词 f norm COUPLING nonhomogeneous Markov chains CONVERGENCE
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MULTIPLE SOLUTIONS FOR NONHOMOGENEOUS SCHRDINGER-POISSON EQUATIONS WITH SIGN-CHANGING POTENTIAL 被引量:1
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作者 王丽霞 马世旺 许娜 《Acta Mathematica Scientia》 SCIE CSCD 2017年第2期555-572,共18页
In this article, we study the following nonhomogeneous Schrodinger-Poissone quations{-△u+λV(x)u+K(x)Фu=f(x,u)+g(x),x∈R^3,-△Ф=k(x)u^2, x∈R^3}where λ 〉 0 is a parameter. Under some suitable assumpt... In this article, we study the following nonhomogeneous Schrodinger-Poissone quations{-△u+λV(x)u+K(x)Фu=f(x,u)+g(x),x∈R^3,-△Ф=k(x)u^2, x∈R^3}where λ 〉 0 is a parameter. Under some suitable assumptions on 11, K, f and g, the existence of multiple solutions is proved by using the Ekeland's variational principle and the Mountain Pass Theorem in critical point theory. In particular, the potential V is allowed to be signchanging. 展开更多
关键词 nonhomogeneous sign-changing potential SchrOdinger-Poisson equations Eke-land's variational principle Mountain Pass Theorem
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GLOBAL STRONG SOLUTION AND EXPONENTIAL DECAY OF 3D NONHOMOGENEOUS ASYMMETRIC FLUID EQUATIONS WITH VACUUM 被引量:1
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作者 Guochun WU Xin ZHONG 《Acta Mathematica Scientia》 SCIE CSCD 2021年第5期1428-1444,共17页
We prove the global existence and exponential decay of strong solutions to the three-dimensional nonhomogeneous asymmetric fluid equations with nonnegative density provided that the initial total energy is suitably sm... We prove the global existence and exponential decay of strong solutions to the three-dimensional nonhomogeneous asymmetric fluid equations with nonnegative density provided that the initial total energy is suitably small.Note that although the system degenerates near vacuum,there is no need to require compatibility conditions for the initial data via time-weighted techniques. 展开更多
关键词 nonhomogeneous asymmetric fluid equations global strong solution exponential decay VACUUM
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Free vibrations of simply supported nonhomogeneous isotropic rectangular plates of bilinearly varying thickness and elastically restrained edges against rotation using Rayleigh-Ritz method 被引量:1
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作者 Yajuvindra Kumar 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2012年第2期273-280,共8页
This paper addresses the free transverse vibrations of thin simply supported nonhomogeneous isotropic rectangular plates of bilinearly varying thickness with elastically restrained edges against rotation. The Gram-Sch... This paper addresses the free transverse vibrations of thin simply supported nonhomogeneous isotropic rectangular plates of bilinearly varying thickness with elastically restrained edges against rotation. The Gram-Schmidt process has been used to generate two-dimensional boundary characteristic orthogonal polynomials, which have been used in the Rayleigh-Ritz method to study the problem. The lowest three frequencies have been computed for various values of nonhomogeneous parameters, thickness parameters, aspect ratio and flexibility parameters. A comparison of the results with those available in the literature has been made. Three-dimensional mode shapes for the specified plate have been presented. 展开更多
关键词 nonhomogeneous RECTANGULAR bilinearly varying thickness elastically restrained
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LOCAL WELL-POSEDNESS OF STRONG SOLUTIONS FOR THE NONHOMOGENEOUS MHD EQUATIONS WITH A SLIP BOUNDARY CONDITIONS 被引量:1
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作者 Hongmin LI Yuelong XIAO 《Acta Mathematica Scientia》 SCIE CSCD 2020年第2期442-456,共15页
This article is concerned with the 3 D nonhomogeneous incompressible magnetohydrodynamics equations with a slip boundary conditions in bounded domain.We obtain weighted estimates of the velocity and magnetic field,and... This article is concerned with the 3 D nonhomogeneous incompressible magnetohydrodynamics equations with a slip boundary conditions in bounded domain.We obtain weighted estimates of the velocity and magnetic field,and address the issue of local existence and uniqueness of strong solutions with the weaker initial data which contains vacuum states. 展开更多
关键词 nonhomogeneous MHD equations local existence and uniqueness VACUUM t-weighted H^2 estimate Galerkin approximation
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Large time asymptotics for solutions to a nonhomogeneous Burgers equation 被引量:1
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作者 S.R.CHIDELLA M.K.YADAV 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2010年第9期1189-1196,共8页
In this article, the solutions to a nonhomogeneous Burgers equation subject to bounded and compactly supported initial profiles are constructed. In an interesting study, Kloosterziel (Journal of Engineering Mathemati... In this article, the solutions to a nonhomogeneous Burgers equation subject to bounded and compactly supported initial profiles are constructed. In an interesting study, Kloosterziel (Journal of Engineering Mathematics 24, 213-236 (1990)) represented a solution to an initial value problem (IVP) for the heat equation, with an initial data in a class of rapidly decaying functions, as a series of self-similar solutions to the heat equation. This approach quickly revealed the large time behaviour for the solution to the IVP. Inspired by Kloosterziel's approach, the solution to the nonhomogeneous Burgers equation is expressed in terms of the self-similar solutions to the heat equation. The large time behaviour of the solutions to the nonhomogeneous Burgers equation is obtained. 展开更多
关键词 nonhomogeneous Burgers equation Hermite polynomials self-similar solutions
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THE COMBINED INVISCID AND NON-RESISTIVE LIMIT FOR THE NONHOMOGENEOUS INCOMPRESSIBLE MAGNETOHYDRODYNAMIC EQUATIONS WITH NAVIER BOUNDARY CONDITIONS 被引量:1
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作者 Zhipeng ZHANG 《Acta Mathematica Scientia》 SCIE CSCD 2018年第6期1655-1677,共23页
In this paper, we establish the existence of the global weak solutions for the non-homogeneous incompressible magnetohydrodynamic equations with Navier boundary condi-tions for the velocity field and the magnetic fiel... In this paper, we establish the existence of the global weak solutions for the non-homogeneous incompressible magnetohydrodynamic equations with Navier boundary condi-tions for the velocity field and the magnetic field in a bounded domain Ω R^3. Furthermore,we prove that as the viscosity and resistivity coefficients go to zero simultaneously, these weaksolutions converge to the strong one of the ideal nonhomogeneous incompressible magneto-hydrodynamic equations in energy space. 展开更多
关键词 nonhomogeneous incompressible MHD equations Navier boundary conditions Inviscid and non-resistive limit
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Improved Multistage Wiener Filters in Nonhomogeneous Clutter Environments 被引量:2
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作者 Bin Tang Xue-Gang Wang Ke-Song Chen 《Journal of Electronic Science and Technology of China》 2008年第1期75-78,共4页
A new method combining space-time preprocessing with multistage Wiener filters(STPMWF)is proposed to improve the performance of space-time adaptive processing(STAP)in nonhomogeneous clutter scenario.The new scheme... A new method combining space-time preprocessing with multistage Wiener filters(STPMWF)is proposed to improve the performance of space-time adaptive processing(STAP)in nonhomogeneous clutter scenario.The new scheme only requires the data from the primary range bin,thus it can suppress discrete interferers efficiently,without calculating the inverse of covariance matrix.Comparing to the original MWF approach,the proposed scheme can be regarded as practical solutions for robust and effective STAP of nonhomogeneous radar data.The theoretical analysis shows that our STPMWF is simple in implementation and fast in convergence.The numeric results by using simulated data exhibit a good agreement with the proposed theory. 展开更多
关键词 Airborne early warning (AEW) radar clutter suppress multistage Wiener filters (MWF) nonhomogeneous clutter space-time adaptive processing(STAP).
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Application of Fractional Calculus to a Linear Third Order (Nonhomogeneous and Homogeneous) Ordinary Differential Equation
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作者 李春宜 《Journal of Southeast University(English Edition)》 EI CAS 1999年第2期115-120,共6页
In this paper we apply fractional calculus to solve the 3rd order ordinary differential equation of the following form: (z-a)(z-b)(z-c)φ 3+(βz 2+γz+D)φ 2+(α(2β-3α-3)z+αγ+α(α+1)(a+b+c))φ 1+α(α-... In this paper we apply fractional calculus to solve the 3rd order ordinary differential equation of the following form: (z-a)(z-b)(z-c)φ 3+(βz 2+γz+D)φ 2+(α(2β-3α-3)z+αγ+α(α+1)(a+b+c))φ 1+α(α-1)(β-2α-2)φ=f. 展开更多
关键词 fractional calculus third order differential equation LINEAR nonhomogeneous HOMOGENEOUS
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AN EXACT ELEMENT METHOD FOR BENDING OF NONHOMOGENEOUS THIN PLATES
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作者 纪振义 叶开沅 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1992年第8期683-690,共8页
In this paper, based on the step reduction method, a new method, the exact element method for constructing finite element, is presented. Since the new method doesn 't need the variational principle, it can be appl... In this paper, based on the step reduction method, a new method, the exact element method for constructing finite element, is presented. Since the new method doesn 't need the variational principle, it can be applied to solve non-positive and positive definite partial differential equations with arbitrary variable coefficient. By this method, a triangle noncompatible element with 6 degrees of freedom is derived to solve the bending of nonhomogeneous plate. The convergence of displacements and stress resultants which have satisfactory numerical precision is proved. Numerical examples are given at the end of this paper, which indicate satisfactory results of stress resultants and displacements can be obtained by the present method. 展开更多
关键词 ALGORITHM nonhomogeneous thin plate BENDING exact element method
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Scattering of SH Wave by a Crack in Nonhomogeneous Interlayer
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作者 盖秉政 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 1997年第3期99-102,共4页
Regarding an interface as a Brekhovskisk’s nonhomogeneous interlayer,the scatteringproblem of SH wave by a crack at the interlayer has been discussd.It is found that the solutionof the wave fields in the vicinity of ... Regarding an interface as a Brekhovskisk’s nonhomogeneous interlayer,the scatteringproblem of SH wave by a crack at the interlayer has been discussd.It is found that the solutionof the wave fields in the vicinity of crack may be reduced to solving a singular integral equationof the first kind with Cauchy kernel,which has thoroughly been investigated theoretically andnumerically.Finally,the experssions for calculating stress intensity factor at the crack tip havebeen proposed. 展开更多
关键词 SH WAVE CRACK nonhomogeneous INTERLAYER
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Stochastic Stabilization for Nonhomogeneous Markovian Jump Discrete-Time Singular Systems
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作者 CHEN Lixiong CUI Wenxia LIU Yuhao 《Journal of Donghua University(English Edition)》 EI CAS 2018年第6期486-490,共5页
Stochastic stability analysis and control synthesis problems are studied for a class of nonhomogeneous Markovian jump discretetime singular systems( MJDSS). The time-varying character is considered to be the model in ... Stochastic stability analysis and control synthesis problems are studied for a class of nonhomogeneous Markovian jump discretetime singular systems( MJDSS). The time-varying character is considered to be the model in a polytopic sense. Based on the parameter dependent stochastic Lyapunov functional and the matrix analysis techniques, sufficient criteria are derived to ensure regularity, causality and stochastic stability of the closed-loop singular system in terms of linear matrix inequalities. Finally,one example is provided to illustrate the effectiveness of our results. 展开更多
关键词 STOCHASTIC stability nonhomogeneous LYAPUNOV FUNCTION SINGULAR system Markovian SWITCHING
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Positive solutions of second-order differential systems with nonhomogeneous boundary conditions
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作者 SUN Jin-yi YANG Bian-xia 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2012年第3期253-267,共15页
This paper is to investigate the positive solutions of the systems of second-order ordinary differential equations with nonhomogeneous multi-point boundary conditions. By the lower and upper solutions method, Schauder... This paper is to investigate the positive solutions of the systems of second-order ordinary differential equations with nonhomogeneous multi-point boundary conditions. By the lower and upper solutions method, Schauder fixed point theorem and fixed point index theory, under certain conditions, it is proved that there exist appropriate regions of parameters in which the problem has at least two, at least one or no positive solution. 展开更多
关键词 nonhomogeneous boundary condition second-order differential system positive solution lowerand upper solutions Schauder fixed point theorem fixed point index
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T1 THEOREM FOR BESOV SPACES ON NONHOMOGENEOUS SPACES
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作者 Donggao Deng Yanchang Han 《Analysis in Theory and Applications》 2005年第3期280-293,共14页
Suppose μ is a Radon measure on R^d, which may be non doubling. The only condition assumed on μ is a growth condition, namely, there is a constant Co 〉 0 such that for all x ∈ supp(μ) and r 〉 0, μ(B(x, r)... Suppose μ is a Radon measure on R^d, which may be non doubling. The only condition assumed on μ is a growth condition, namely, there is a constant Co 〉 0 such that for all x ∈ supp(μ) and r 〉 0, μ(B(x, r)) ≤ Cor^n, where 0 〈 n ≤ d. We prove T1 theorem for non doubling measures with weak kernel conditions. Our approach yields new results for kernels satisfying weakened regularity conditions, while recovering previously known Tolsa's results. We also prove T1 theorem for Besov spaces on nonhomogeneous spaces with weak kernel conditions given in [7] . 展开更多
关键词 Besov space T1 theorem nonhomogeneous space Calderón-Zygmund operator Littlewood-Paley theory
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A MOVING CRACK IN A NONHOMOGENEOUS MATERIAL STRIP
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作者 Wang Baolin Han Jiecai 《Acta Mechanica Solida Sinica》 SCIE EI 2006年第3期223-230,共8页
This paper considers an anti-plane moving crack in a nonhomogeneous material strip of finite thickness. The shear modulus and the mass density of the strip are considered for a class of functional forms for which the ... This paper considers an anti-plane moving crack in a nonhomogeneous material strip of finite thickness. The shear modulus and the mass density of the strip are considered for a class of functional forms for which the equilibrium equation has analytical solutions. The problem is solved by means of the singular integral equation technique. The stress field near the crack tip is obtained. The results are plotted to show the effect of the material non-homogeneity and crack moving velocity on the crack tip field. Crack bifurcation behaviour is also discussed. The paper points out that use of an appropriate fracture criterion is essential for studying the stability of a moving crack in nonhomogeneous materials. The prediction whether the unstable crack growth will be enhanced or retarded is strongly dependent on the type of the fracture criterion used. Based on the analysis, it seems that the maximum 'anti-plane shear' stress around the crack tip is a suitable failure criterion for moving cracks in nonhomogeneous materials. 展开更多
关键词 nonhomogeneous materials fracture mechanics moving crack
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THE GENERAL SOLUTION FOR AXIAL SYMMETRICAL BENDING OF NONHOMOGENEOUS CIRCULAR PLATES RESTING ON AN ELASTIC FOUNDATION
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作者 纪振义 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1991年第9期871-879,共9页
In this paper, a new method, the exact analytic method, is presented on the basis of step reduction method. By this method, the general solution for the bending of nonhomogenous circular plates and circular plates wit... In this paper, a new method, the exact analytic method, is presented on the basis of step reduction method. By this method, the general solution for the bending of nonhomogenous circular plates and circular plates with a circular hole at the center resting, on an elastfc foundation is obtained under arbitrary axial symmetrical loads' and boundary conditions. The uniform convergence of the solution is proved. This general solution can also he applied directly to the bending of circular plates without elastic foundation. Finally, it is only necessary to solve a set of binary linear algebraic equation. Numerical examples are given at the end of this paper which indicate satisfactory results of stress resultants and displacements can be obtained by the present method. 展开更多
关键词 exact analytic method nonhomogeneous circular thin plate general solution
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