Multiplicative Jordan Decomposition in Integral Group Ring of Group K_8×C_5

In this article,we present the multiplicative Jordan decomposition in integral group ring of group K8 × C5,where K8 is the quaternion group of order 8.Thus,we give a positive answer to the question raised by Hales A W,Passi I B S and Wilson L E in the paper 'The multiplicative Jordan decomposition in group rings II.

On the Structure of the Augmentation Quotient Group for Some Non-abelian p-groups

In this paper, we study the basis of augmentation ideals and the quotient groups of finite non-abelian p-group which has a cyclic subgroup of index p, where p is an odd prime, and k is greater than or equal to 3. A concrete basis for the augmentation ideal is obtained and then the structure of its quotient groups can be determined.

Upgrading of a Heavy Ion 1MeV ISR RFQ Accelerator

This paper presents new beam test results for O^+ beam on a high current Integral Split Ring Radio Frequency Quadruple(ISR RFQ)accelerator.After the upgrading,a new designed 2.45GHz O^+ ECR Ion Source can provide a beam with macro-puise peak current of 4mA at the injection point behind a 15ram diaphragm,whose O^+ factor is 60%—80% varied with gas flow rate and the normalized rms emittance is less than 0.15πmm·mrad.The accelerated O^+ beam current goes up to 2mA with the transmission of about 80% at 45kW RF power with duty factor 1/6(pulse duration of 1ms and repetition frequency of 166Hz).The upgraded RF power system includes low level RF pulse modulation amplifier,AGC,3W and 20W preamplifiers,1kW driver and 30kW final amplifier,which can output nearly 50kW in pulsed mode.The vacuum has been improved,too.The upgraded 1MeV ISR RFQ can be used as the beam injector of a new designed SFRFQ accelerating system,which is under the construction at Peking University.

Structure of augmentation quotients of finite homocyclic abelian groups

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.

Coleman Automorphisms of Holomorphs of Finite Abelian Groups

Let K be a finite abelian group and let H be the holomorph of K. It is shown that every Coleman automorphism of H is an inner automorphism. As an immediate consequence of this result, it is obtained that the normalizer property holds for H.

Studies on RFQ accelerators and its applications

Development activities of Radio Frequency Quadrupole （RFQ） accelerators in China are presented. A 1 MeV O＋ RFQ and a 3.5 MeV ADS proton RFQ have been constructed. A novel separated function RFQ is under beam test, a 2 MeV D＋ RFQ is under construction and a CSNS RFQ is going to be constructed. The RFQ dynamics and the simultaneous dual beam acceleration with positive and negative ions were investigated and related codes were developed. The applications of RFQ will be further promoted in China.

The Stable Behavior of the Augmentation Quotients of the Groups of Order p^5, I

In this article we describe the stable behavior of the augmentation quotients Qn （G） for the groups G of order p^5 with even numbers of generators, where p is an odd prime.

Class-Preserving Coleman Automorphisms of Finite Groups with Prescribed Centralizers

Let G be a finite group. It is proved that any class-preserving Coleman automorphism of G is an inner automorphism whenever G belongs to one of the following two classes of groups： （1） CN-groups, i.e., groups in which the centralizer of any element is nilpotent; （2） CIT-groups, i.e., groups of even order in which the centralizer of any involution is a 2-group. In particular, the normalizer conjecture holds for both CN-groups and CIT-groups. Additionally, some other results are also obtained.