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ON THE ASYMPTOTIC SPECTRUM OF A TRANSPORT OPERATOR WITH ELASTIC AND INELASTIC COLLISION OPERATORS
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作者 Abdul-Majeed AL-IZERI Khalid LATRACH 《Acta Mathematica Scientia》 SCIE CSCD 2020年第3期805-823,共19页
In this article,we investigate the spectral properties of a class of neutron transport operators involving elastic and inelastic collision operators introduced by Larsen and Zweifel[1].Our analysis is manly focused on... In this article,we investigate the spectral properties of a class of neutron transport operators involving elastic and inelastic collision operators introduced by Larsen and Zweifel[1].Our analysis is manly focused on the description of the asymptotic spectrum which is very useful in the study of the properties of the solution to Cauchy problem governed by such operators(when it exists).The last section of this work is devoted to the properties of the leading eigenvalue(when it exists).So,we discuss the irreducibility of the semigroups generated by these operators.We close this section by discussing the strict monotonicity of the leading eigenvalue with respect to the parameters of the operator. 展开更多
关键词 Compactness properties transport operator abstract boundary conditions asymptotic spectrum IRREDUCIBILITY leading eigenvalue
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Frost heave control of fine round gravel fillings in deep seasonal frozen regions
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作者 ZuRun Yue TianLiang Wang +1 位作者 Chao Ma TieCheng Sun 《Research in Cold and Arid Regions》 CSCD 2013年第4期425-432,共8页
Fine round gravel soil is widely employed in the subgrade of high and thawing. The lower the fines content in fine round gravel soil, but compaction difficulty increases. This study is to obtain the speed railways in ... Fine round gravel soil is widely employed in the subgrade of high and thawing. The lower the fines content in fine round gravel soil, but compaction difficulty increases. This study is to obtain the speed railways in cold regions to prevent frost heaving the smaller the quantities of frost heaving and thawing, optimum fines content and limited frost heaving and thawing. The fine round gravel soil filling (FRGSF) used in the Harbin-Qiqihaer Passenger Dedicated Line is taken as the study object. Influence of fines content on optimum water content, maximum dry density and frost heaving properties of FRGSF were studied by means of compaction and frost heaving tests. Results show that the maximum dry density of the FRGSF increases first and then decreases with an increase of fines content, namely there is an optimum fines content for easy compaction. The method of surface-vibratory instrument is fit for coarse-grained soils, and wet state of coarse-grained soil is in favor of compaction. Considering the relationship of fines content with maximum dry density and the frost heaving ratio of FRGSF, the fines content should be limited to within the range of 9%-10%, so that the frost heaving ratio is less than 1%, and the FRGSF is easily compacted. Water supply is proved to be an important factor influencing the amount of frost heaving of FRGSF. We also conclude that in the field, it is imperative to control waterproofing and drainage measures. 展开更多
关键词 cold regions fine round gravel soil filling frost heaving ratio compaction properties
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Quantitative Characterizations of Bounded Compact Approximation Property by Semi-Fredholm Operators
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作者 Dong Yang CHEN Ying Bin RUAN 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2023年第6期1115-1128,共14页
Based on a characterization of upper semi-Fredholm operators due to A.Lebow and M.Schechter,we introduce and investigate a new quantity characterizing upper semi-Fredholm operators.This quantity and several well-known... Based on a characterization of upper semi-Fredholm operators due to A.Lebow and M.Schechter,we introduce and investigate a new quantity characterizing upper semi-Fredholm operators.This quantity and several well-known quantities are used to characterize bounded compact approximation property.Similarly,a new quantity characterizing lower semi-Fredholm operators is introduced,investigated and used to characterize the bounded compact approximation property for dual spaces. 展开更多
关键词 Bounded compact approximation property compact operators upper semi-Fredholm operators lower semi-Fredholm operators
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Three-space Problems for the Bounded Compact Approximation Property
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作者 Dong Yang CHEN Ben Tuo ZHENG 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2013年第4期625-632,共8页
In this paper, the notion of the bounded compact approximation property (BCAP) of a pair [Banach space and its subspace] is used to prove that if X is a closed subspace of Eoo with the BCAP, then L∞/X has the BCAP.... In this paper, the notion of the bounded compact approximation property (BCAP) of a pair [Banach space and its subspace] is used to prove that if X is a closed subspace of Eoo with the BCAP, then L∞/X has the BCAP. We also show that X* has the A-BCAP with conjugate operators if and only if the pair (X, Y) has the A-BCAP for each finite codimensional subspace Y C X. Let M be a closed subspace of X such that M~ is complemented in X*. If X has the (bounded) approximation property of order p, then M has the (bounded) approximation property of order p. 展开更多
关键词 The bounded compact approximation property a pair the (bounded) approximationproperty of order p
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