检索结果-南通市图书馆

A specific family of cyclotomic polynomials of order three

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2010年第9期53卷 2269-2274页

作者： JI ChunGang school of mathematical sciences,Nanjing Normal university,Nanjing 210097,china school of mathematical sciences Nanjing Normal University Nanjing China

Let A(n) be the largest absolute value of any coefficient of n-th cyclotomic polynomial Φn(x).We say Φn(x) is flat if A(n) = *** this paper,for odd primes p < q < r and 2r ≡±1(mod pq),we prove that Φpqr(x) is fla... 详细信息

Let A(n) be the largest absolute value of any coefficient of n-th cyclotomic polynomial Φn(x).We say Φn(x) is flat if A(n) = *** this paper,for odd primes p 2r ≡±1(mod pq),we prove that Φpqr(x) is flat if and only if p = 3 and q ≡ 1(mod 3).

关键词： cyclotomic polynomial flat cyclotomic polynomial ternary cyclotomic polynomial

Therapeutic effect of osthole on hyperlipidemic fatty liver in rats

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2007年第3期28卷 398-403页

作者： Yan ZHANG Mei-lin XIE~2 Lu-jia ZHU Zhen-lun GU Department of Pharmacology,Medical school of Soochow university suzhou 215123,china Department of Pharmacology Medical School of Soochow University Suzhou China

Aim:To study the effects of osthole on hyperlipidemic fatty liver and investigatethe possible ***:A rat model with hyperlipidemic fatty liverwas successfully established by feeding fatty milk for 6 *** experimentalrats were then treated with 5-20 mg/kg osthole for 6 *** mouse hyperlipi-demic model was induced by feeding fatty milk when they were treated with 10-20mg/kg osthole for 3 ***:After treatment with osthole,the levels of ratserum total cholesterol(TC),triglyceride(TG)and low density lipoprotein-choles-terol significantly decreased as compared with the fatty liver model group(P20 mg/kg osthole for 3 weeks(P<0.05 or P<0.01).Importantly,the histological evaluation of rat liver demonstrated that ostholedramatically decreased lipid accumulation(P<0.01).Conclusion:Osthole wasfound to have therapeutic effects on fatty milk-induced rat fatty liver;the mecha-nisms might be associated with its anti-oxidation and the elevation of the activi-ties of LPL and HL.

关键词： osthole hyperlipidemic fatty liver pharmacology

Efficient estimation for additive hazards regression with bivariate current status data

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china Mathematics 2012年第4期55卷 763-774页

作者： TONG XingWei 1,,HU Tao 2 & SUN JianGuo 3,4 1 school of mathematical sciences,Beijing Normal university,Beijing 100875,china 2.school of mathematical sciences,Capital Normal university,Beijing 100048,china 3 school of Mathematics,Jilin university,Changchun 130012,china 4 Department of Statistics,university of Missouri,Columbia,MO 65211,USA school of mathematical sciences Beijing Normal University Beijing China school of mathematical sciences Capital Normal University Beijing China school of Mathematics Jilin University Changchun China Department of Statistics University of Missouri Columbia USA

This paper discusses efficient estimation for the additive hazards regression model when only bivariate current status data are available. Current status data occur in many fields including demographical studies and tumorigenicity experiments （Keiding, 1991; Sun, 2006） and several approaches have been proposed for the additive hazards model with univariate current status data （Linet M., 1998; Martinussen and Scheike, 2002）. For bivariate data, in addition to facing the same problems as those with univariate data, one needs to deal with the association or correlation between two related failure time variables of interest. For this, we employ the copula model and an efficient estimation procedure is developed for inference. Simulation studies are performed to evaluate the proposed estimates and suggest that the approach works well in practical situations. An illustrative example is provided.

关键词： bivariate current status data copula model counting processes efficient estimation joint survivalfunction

Global Existence of Classical Solutions for Some Oldroyd-B Model via the Incompressible Limit

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2006年第5期27卷 565-580页

作者： Zhen LEI school of mathematical sciences, Fudan university, Shanghai 200433, china school of Mathematics and Statistics, Northeast Normal university, Changchun 130024, china. school of mathematical sciences Fudan University Shanghai 200433 China school of Mathematics and Statistics Northeast Normal University Changchun 130024 China

In this paper, we prove local and global existence of classical solutions for a system of equations concerning an incompressible viscoelastic fluid of Oldroyd-B type via the incompressible limit when the initial data ... 详细信息

关键词： Incompressible limit Global existence Oldroyd model

On the error term in Weyl’s law for the Heisenberg manifolds (Ⅱ)

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2009年第5期52卷 857-874页

作者： ZHAI WenGuang school of mathematical sciences, Shandong Normal university, Jinan 250014, china school of mathematical sciences Shandong Normal University Jinan China

In this paper we study the mean square of the error term in the Weyl's law of an irrational (2l + 1)-dimensional Heisenberg manifold. An asymptotic formula is established.

关键词： Heisenberg manifold Weyl’s law error term mean square

SOBOLEV INEQUALITY ON RIEMANNIAN MANIFOLDS

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2005年第4期26卷 651-658页

作者： WANG MENG Department of Mathematics, Zhejiang university, Hangzhou 310027, china school of mathematical sciences, Pudan university, Shanghai 200433, china. Department of Mathematics Zhejiang University Hangzhou 310027 China school of mathematical sciences Fudan University Shanghai 200433 China

Let M be an n dimensional complete Riemannian manifold satisfying the doublingvolume property and an on-diagonal heat kernel estimate. The necessary-sufficientcondition for the Sobolev inequality ‖f‖q ≤ Cn,,v,p,q(... 详细信息

关键词： Sobolev inequality Complete manifold Riesz transform Potential Heat kernel

Multipliers and Herz type spaces

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2008年第10期51卷 1919-1936页

作者： LU ShanZhen school of mathematical sciences, Beijing Normal university, Beijing 100875, china school of mathematical sciences Beijing Normal University Beijing China

Hrmander condition for boundedness of multiplier operators will be replaced by a weaker condition described by certain weighted or non-weighted Herz spaces. Some results on boundedness of multiplier operators are then established. As direct corollaries of main theorems in this paper, several celebrated results on boundedness of multiplier operators will be improved or deduced.

关键词： multiplier Herz space Herz type Hardy space 42B15 42B30 42B35

Finite groups in which elements of the same order outside the center are conjugate

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2007年第10期50卷 1493-1500页

作者： Xing-zhong YOU~1 Guo-hua QIAN~2 Wu-jie SHI~(3+) ~1 school of Mathematics and Computing Science,Changsha university of Science and Technology,Changsha 410076,china ~2 Department of Mathematics,Changshu Institute of Technology,Changshu 215500,china ~3 school of Mathematics,suzhou university,suzhou 2.5006,china school of Mathematics and Computing Science Changsha University of Science and Technology Changsha China Department of Mathematics Changshu Institute of Technology Changshu China school of Mathematics Suzhou University Suzhou China

We prove that if G is a finite group in which the elements of the same order outside the center are conjugate, then either G is abelian or G ≌ S3.

关键词： finite group, rational group, conjugacy class

Structure of augmentation quotients of finite homocyclic abelian groups

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2007年第9期50卷 1280-1288页

作者： Guo-ping TANG school of mathematical sciences,Graduate university of Chinese Academy of sciences,Beijing 100049,china school of mathematical sciences Graduate University of Chinese Academy of Sciences Beijing China

Let G be a finite abelian group and its Sylow p-subgroup a direct product of copies of a cyclic group of order p r , i.e., a finite homocyclic abelian group. Let Δ n (G) denote the n-th power of the augmentation ideal Δ(G) of the integral group ring ?G. The paper gives an explicit structure of the consecutive quotient group Q n (G) = Δ n (G)/Δ n+1(G) for any natural number n and as a consequence settles a problem of Karpilovsky for this particular class of finite abelian groups.

关键词： integral group ring augmentation ideal consecutive quotient of augmentation ideal 16S34 20C05