检索结果-南通市图书馆

α-decay Branching Ratios to Rotational Band of Heavy Even-even and Odd-A Nuclei

在线全文

学校读者我要写书评

暂无评论

原子核物理评论 2009年第S1期26卷 55-58页

作者： REN Zhong-zhou1,2,3,XU Chang2,3 (1 Center of Theoretical Nuclear physics,National Laboratory of Heavy Ion Research Facility in Lanzhou,Lanzhou 730000,china 2 department of physics,nanjing university,nanjing 210008,china 3 Joint Center for Particle,Nuclear physics and Cosmology,nanjing 210008,china) Center of Theoretical Nuclear physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China department of physics Nanjing UniversityNanjing 210008China Joint Center for Particle Nuclear Physics and CosmologyNanjing 210008China department of physics Nanjing UniversityNanjing 210008China Joint Center for Particle Nuclear Physics and CosmologyNanjing 210008China

By using a simple barrier penetration approach,we predict the α-decay branching ratios to members of ground-state rotational band of heavy even-even No isotopes. We also extend our approach to calculate the α-decay branching ratios to the rotational band of heavy odd-A nuclei. The theoretical branching ratios of α-decays are found in good agreement with the available experimental data.

关键词： α-decay branching ratio heavy nuclei

A GOLDSTEIN'S TYPE PROJECTION METHOD FOR A CLASSOF VARIANT VARIATIONAL INEQUALITIES

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1999年第4期17卷 425-434页

作者： Bing-sheng He(department of Mathematics, nanjing university, nanjing 210008, china) department of Mathematics Nanjing University Nanjing 210008 China

Some optimization problems in mathematical programming can be translated to a variant variational inequality of the following form: Find a vectoru*, such that This paper presents a simple iterative method for solving this class of variational inequalities. The method can be viewed as an extension of theGoldstein's projection method. Some results of preliminary numerical experiments are given to indicate its applications.

关键词： Variational inequality Goldstein projection method.

L-R smash products for bimodule algebras

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2006年第6期16卷 580-587页

作者： ZHANG Liangyun (department of Mathematics, nanjing Agricultural university, nanjing 210095, china department of Mathematics, nanjing university, nanjing 210008, china) department of Mathematics Nanjing Agricultural University Nanjing 210095 China department of Mathematics Nanjing University Nanjing 210008 China

In this paper, we prove that the L-R smash product A(?)H is exactly the twisted smash product A * H if H is a finite dimensional cocommutative Hopf algebra, and give a sufficient and necessary condition for L-R smash products to be bialgebras (Hopf algebras) . For any finite dimensional coquasitriangular Hopf algebra (H,σ), we prove that the L-R smash product H(?)H is semisimple Artinian if H is semisimple and H * is unimodular. In particular, the L-R smash product D(H)* (?)D(H)* semisimple Artinian if the Drin-fel'd double D(H) is semisimple.

关键词： bimodule algebras L-R smash products coquasitriangular Hopf algebras Long bialgebras.

A Doubly Achromatic Two-magnet Nonuniform Field Bending System of 270° in Deflection

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese journal of nuclear physics 1995年第2期17卷 179-184页

作者： Wang Houwen(department of physics,nanjing university,nanjing 210008) nanjing Univ Nanjing China

A new doubly achromatic two-magnet beam bending system is *** of two nonuniform dipoles separated by a small drift *** doublyachromatic relations are *** system showed excellent achromatic and focusingproperties and good quality of electron beam with small *** small diver-gence and axial symmetry were produced at the output of the *** system isspecially suitable for low energy electron linac beam with large energy spread.

关键词： 270° doubly achromatic deflection Two nonuniform field dipoles Small and axial symmetric beam

LIMIT CYCLES AND BIFURCATION CURVES FOR THE QUADRATIC DIFFERENTIAL SYSTEM (III)_(m=0) HAVING THREE ANTI-SADDLES (I)

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 1996年第2期17卷 167-174页

作者： YE YANQIAN department of Mathematics, nanjing university, nanjing 210008, china. 南京大学数学系江苏南京

For the quadratic system: x=-y+δx + lx2 + ny2, y=x(1+ax-y) under conditions -10 the author draws in the (a, ()) parameter plane the global bifurcationdiagram of trajectories around O(0,0). Notice that when na2+l < 0 ... 详细信息

关键词： Quadrtic systen Anti-saddle Bifurcation curve Limit cycle

Maschke-type theorem and Morita context over weak Hopf algebras

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2006年第5期49卷 587-598页

作者： ZHANG Liangyun College of Science, nanjing Agricultural university, nanjing 210095, china department of Mathematics, nanjing university, nanjing 210008, china College of Science Nanjing Agricultural University Nanjing China department of Mathematics Nanjing University Nanjing China

This paper gives a Maschke-type theorem over semisimple weak Hopf algebras,extends the well-known Maschke-type theorem given by Cohen and Fishman and constructs a Morita context over weak Hopf algebras.

关键词： weak Hopf algebra, smash product, Maschke-type theorem, Morita context.

THE UNIQUENESS OF BIFURCATION TO SEPARATRIX LOOPS IN SUPERCRITICAL CASES

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 1994年第4期15卷 493-500页

作者： SUN JIANHUA (department of Mathematics, nanjing university, nanjing 210008, china.) 南京大学数学系江苏南京

In paper[4]the existence of bifurcation to separatrir loops in supercritical cases on the planeis studied. This note is a continuation of [4].The author proves the uniqueness of limit cyclesin a neighborhood of the sa... 详细信息

关键词： Supercritical Separatrir loop Bifurcation Limit cycle Uniqueness.

SUPPLEMENT　TO“PASSAGE，BLOCKADE，SINK　AND　SOURCE　OF　A　PLANAR　DYNAMICAL　SYSTEMS”

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 1994年第4期15卷 489-492页

作者： YE YANQIAN(department of Mathematics, nanjing university, nanjing 210008,china.) 南京大学数学系江苏南京

A Theorem is given on the number of passages passing throgh a multiply-connected region,which corrects a wrong conjecture in a former paper of the author.

关键词： Passage Multiply-connected region Critical point Saddle point.

FERROMAGNETIC RESONANCE STUDIES OF Co/CoFe_2O_4 MULTILAYERS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1999年第2期12卷 181-184页

作者： B.X. Gu(department of physics, nanjing university, nanjing 210093, china)H. Wang(department of physics, Southeastern university, nanjing 210008, china)Manuscript receivedin revised form 12 October 1998) nanjing Univ Nanjing China

The Co/CoFe2O4 multilayers have been grown on the glass substrate using sputtering techniques. In these films the Co layers were measured to have the fcc structure with [11] axis perpendicular to the film plane, and the CoFe2O4 layers are amorphous. Ferromagnetic resonance measurements have been made as a function of the external magnetic field orientation in a plane perpendicular to the film. The effective magnetization, effective anisotropy constant and interface anisotropy constant have been determined. The influence of Co layers thickness on magnetic properties was discussed.

关键词： Co/CoFe_2O_4 multilayer ferromagnetic resonance magnetic property