期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
PHOTOPHYSICAL STUDY OF SULFONATED POLYSTYRENE
1
作者 ZHANGJixiang LIHexian +2 位作者 WANGGuochang WANGYuexi HEBinglin 《Chinese Journal of Reactive Polymers》 2004年第1期29-34,共6页
The photophysical properties of a series of sulfonated micromolecule (paratoluenesulfonic acid, HPTS) and macromolecules (linear and crosslinked polystyrene) have been studied by steady-state fluorescence spectra. The... The photophysical properties of a series of sulfonated micromolecule (paratoluenesulfonic acid, HPTS) and macromolecules (linear and crosslinked polystyrene) have been studied by steady-state fluorescence spectra. The results indicate that the ground sulfonated ring associations can form in both the micromolecules and the macromolecules. The fluorescence spectra of the sulfonated crosslinked copolymers appear a red-shift when the copolymers change from hydrogen-type to sodium-type, and some new emission bands appear in the long-wavelength region. These results are explained in terms of synergetic effect of hydrogen bond,π-πinteraction and crosslinking effect. 展开更多
关键词 PHOTOPHYSICS FLUORESCENCE Ground sulfonated ring association.
下载PDF
Association of edge-to-edge valve repair with artificial ring annuloplasty for severe tricuspid insufficiency
2
作者 柳克晔 《外科研究与新技术》 2011年第3期169-170,共2页
Objective To analyze whether association of edge to edge valve repair with artificial ring annuloplasty would result in better results in patients with severe tricuspid regurgitation (TR) . Methods From April,2001 to ... Objective To analyze whether association of edge to edge valve repair with artificial ring annuloplasty would result in better results in patients with severe tricuspid regurgitation (TR) . Methods From April,2001 to May, 2010,41 patients underwent tricuspid valve repair to treat severe TR were studied. Twenty-one patients were done artificial ring annuloplasty alone (group R) and twenty patients were done artificial ring annuloplasty associated with edge to edge valve repair (group E) . All the 展开更多
关键词 RING TRA Association of edge-to-edge valve repair with artificial ring annuloplasty for severe tricuspid insufficiency
下载PDF
Group inverses for some 2 × 2 block matrices over rings 被引量:3
3
作者 Chongguang CAO Yingchun WANG Yuqiu SHENG 《Frontiers of Mathematics in China》 SCIE CSCD 2016年第3期521-538,共18页
Abstract We first consider the group inverses of the block matrices(AB0C)over a weakly finite ring. Then we study the sufficient and necessary conditions for the existence and the representations of the group invers... Abstract We first consider the group inverses of the block matrices(AB0C)over a weakly finite ring. Then we study the sufficient and necessary conditions for the existence and the representations of the group inverses of the block matrices(ABCD)over a ring with unity 1 under the following conditions respectively: (i) B = C, D = 0,B#and(BπA0#both exist; (ii) B is invertible and m = n;(iii)A#and (D - CA#B)# both exist, C = CAA#, where A and D are m × m and n × n matrices, respectively. 展开更多
关键词 Group inverse block matrix right Ore domain associative ring
原文传递
Integrally Closed Ideals of Reduction Number Three
4
作者 Shinya Kumashiro 《Algebra Colloquium》 SCIE CSCD 2023年第2期315-324,共10页
In a Cohen-Macaulay local ring(A,m),we study the Hilbert function of an integrally closed m-primary ideal I whose reduction number is three.,With a mild assump-tion we give an inequality ιA(A/I)≥e0(I)-e1(I)+(e2(I)+l... In a Cohen-Macaulay local ring(A,m),we study the Hilbert function of an integrally closed m-primary ideal I whose reduction number is three.,With a mild assump-tion we give an inequality ιA(A/I)≥e0(I)-e1(I)+(e2(I)+lA(I^(2)/QI)/2,where ei(I)denotes the ith Hilbert coeficient and Q denotes a minimal reduction of I.The inequality is located between inequalities of Itoh and Elias-Valla.Furthermore,this inequality be-comes an equality if and only if the depth of the associated graded ring of I is larger than or equal to dim A-1.We also study the Cohen-Macaulayness of the associated graded rings of determinantal rings. 展开更多
关键词 Hilbert function Rees algebra associated graded ring Sally module Cohen-Macaulay ring
原文传递
The Classification of Torsion-free TI-Groups
5
作者 Ryszard R.Andruszkiewicz Mateusz Woronowiczt 《Algebra Colloquium》 SCIE CSCD 2022年第4期595-606,共12页
An abelian group A is called a TI-group if every associative ring with the additive group A is filial.The filiality of a ring R means that the ring R is associative and all ideals of any ideal of R are ideals in R.In ... An abelian group A is called a TI-group if every associative ring with the additive group A is filial.The filiality of a ring R means that the ring R is associative and all ideals of any ideal of R are ideals in R.In this paper,torsion-free TI-groups are described up to the structure of associative nil groups.It is also proved that,for torsion-free abelian groups that are not associative nil,the condition TI implies the indecomposability and homogeneity.The paper contains constructions of 2^(■o)such groups of any rank from 2to 2^(■o)which are pairwise non-isomorphic. 展开更多
关键词 torsion-free abelian group filial ring associative ring commutative ring additivegroupsof rings
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部