期刊：
Nuclear Science and Engineering,2004年147(1):63-72 ISSN：0029-5639
通讯作者：
Fan, S
作者机构：
[Fan, S] Inst Atom Energy, Beijing 102413, Peoples R China.;Shanghai Univ, Shanghai Appl Radiat Inst, Shanghai 201800, Peoples R China.;Hunan City Univ, Dept Phys, Yiyang 413049, Peoples R China.;N China Elect Power Univ, Beijing 102206, Peoples R China.;NW Univ Xian, Dept Phys, Xian 710006, Peoples R China.
通讯机构：
[Fan, S] I;Inst Atom Energy, Beijing 102413, Peoples R China.
摘要：
To simplify the calculation, some assumptions are considered in the current work. The preequilibrium emission in the first step in the equilibrium process, which is characterized by exciton n = 3 and "never come back, " is considered in the preequilibrium emission process; the alpha emission is only completed with the neutron and proton emission, and the second particle emission is neglected. Under those assumptions, a semiempirical systematics of the cross section for the (n, a) reaction is obtained on the basis of the evaporation and exciton models for the energies ranging up to 20 Me V Within the nuclide mass region of 23 less than or equal to A < 209, a strong dependence on (N - Z + 1)/A and the incident neutron has been observed. The predictions of the semiempirical systematics with the global parameter of the excitation functions for the (n,alpha) reaction are in good agreement with the experimental data.
摘要：
A new enzyme-based amperometric biosensor for hydrogen peroxide was developed relying on the efficient immobilization of horseradish peroxidase (HRP) to a nano-scaled particulate gold (nano-Au) film modified glassy carbon electrode (GC). The nano-Au film was obtained by a chitosan film which was first formed on the surface of GC. The high affinity of chitosan for nano-Au associated with its amino groups resulted in the formation of nano-Au film on the surface of GC. The film formed served as an intermediator to retain high efficient and stable immobilization of the enzyme. H2O2,was detected using hydroquinone as an electron mediator to transfer electrons between the electrode and HRP. The HRP immobilized on nano-Au film maintained excellent electrocatalytical activity to the reduction of H2O2. The experimental parameters such as the operating potential of the working electrode, mediator concentration and pH of background electrolyte were optimized for best analytical performance of amperometry. The linear range of detection for H2O2 is from 6.1 x 10(-6) to 1.8 x 10(-3) mol L-1 with a detection limit of 6.1 mumol L-1 based on signal/noise = 3. The proposed HRP enzyme sensor has the features of high sensitivity (0.25 Almol(-1)cm(-2)), fast response time (t(90%) less than or equal to 10 s) and a long-term stability (> 1 month). As an extension, glucose oxidase (GOD) was chemically bound to HRP-modified electrode. A GOD/HRP bienzyme-modified electrode formed in this way can be applied to the determination of glucose with satisfactory performance.
摘要：
We introduce a purely anharmonic lattice model with specific double-well on-site potential, which admits traveling compacton-like solitary wave solutions by the inverse method with the help of Mathematica. By properly choosing the shape of the solitary wave solution of the system, we can calculate the parameters of the specific on-site potential. We also found that the localization of the compacton is related to the nonlinear coupling parameter Cnl and the potential parameter V0 of the on-site potential, and the velocity of the propagation of the compacton is determined by the localization parameter q and the potential parameter V0. Numerical calculation results demonstrate that the narrow compacton is unstable while the wide compacton is stable when they move along the lattice chain.
作者机构：
[Xia, QL] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Peoples R China.;Hunan City Univ, Dept Phys & Elect Sci, Yiyang 413049, Peoples R China.
通讯机构：
[Xia, QL] C;Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Peoples R China.
关键词：
非线性克莱茵-高登方程;类结致密子;非简谐格子;对称势
摘要：
We study the moving compacton-like kink in the system of a purely anharmonic lattice with symmetric onsite potential by a direct algebraic method. It is found that the localization of the compactons is related to the nonlinear coupling parameter Cnl and the potential barrier height V0 of the double well potential, and the velocity of the propagation of the compacton is determined by the localization parameter q and the potential barrier height V0. Numerical calculation results demonstrate that the compacton is stable when it moves along the lattice chain.
作者机构：
[Yingqing S.] School of Science, Nanjing University of Science and Technology, Nanjing 210094, China, Department of Mathematics, Hunan University of City, Yiyang 413000, China;[Xiaoping Y.] School of Science, Nanjing University of Science and Technology, Nanjing 210094, China;[Zhenghai L.] Department of Mathematics, Changsha University of Electrical Power, Changsha 410077, China
摘要：
The aim of this paper is to get the decomposition of distributional derivatives of functions with bounded variation in the framework of Carnot-Carathéodory spaces (C-C spaces in brievity) in which the vector fields are of Carnot type. For this purpose the approximate continuity of BV functions is discussed first, then approximate differentials of L1 functions are defined in the case that vector fields are of Carnot type and finally the decomposition Xu = ∇u · Ln + Xsu is proved, where u ∈ BVx(Ω) and ∇u denotes the approximate differential of u.
作者机构：
Hunan City Univ, Dept Phys, Yiyang 413049, Peoples R China.;Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.;Hunan Normal Univ, Inst Nonlinear Phys, Changsha 410081, Peoples R China.;[Jiaren Y.; Guanghui Z.] Physics Department, Institute of Nonlinear Physics, Hunan Normal University, Changsha 410081, China;[Liuxian P.] Department of Physics, Hunan City University, Yiyang 413049, China
通讯机构：
[Liuxian, P.] D;Department of Physics, Hunan City University, China
关键词：
KdV-MKdV equation;soliton;perturbation
摘要：
The authors develop a direct approach to the soliton perturbation based on the separation of variables. With the aid of approach, the first-order effects of perturbation on a KdV-MKdV soliton are derived, both the slow time-dependence of the soliton parameters and the first-order correction are obtained.
期刊：
Journal of Mathematical Analysis and Applications,2003年287(1):296-306 ISSN：0022-247X
通讯作者：
Song, YQ
作者机构：
Hunan City Univ, Dept Math & Calc, Yiyang 413000, Hunan, Peoples R China.;Nanjing Univ Sci & Tech, Sch Sci, Nanjing 210094, Peoples R China.;[Song, YQ] Hunan City Univ, Dept Math & Calc, Zhaoyang Rd 4, Yiyang 413000, Hunan, Peoples R China.
通讯机构：
[Song, YQ] H;Hunan City Univ, Dept Math & Calc, Zhaoyang Rd 4, Yiyang 413000, Hunan, Peoples R China.
关键词：
Bvh function;Heisenberg group;Decomposition of a radon measure;Chain rule;Compactness theorem;Perimeter;Spaces
摘要：
At first in the setting of the Heisenberg group we show the chain rule for a function u is an element of BVH (Omega) when composed with a Lipschitz function f : R --> R and prove that nu = f o u belongs to BV (H) (Omega) and D(H)nu much less than D(H)u. More precisely the following result is shown: D(H)nu = f' ((u) over tilde)del(H)uL(2n+1) + 2omega(2n-1)/omega(2n+1) (f(u(+)) - f(u(-)))nu(u)S(d)(Q-1) [J(u) + f' ((u) over tilde) D(H)(c)u. Secondly using the chain rule above we prove a compactness theorem for SBVH functions. (C) 2003 Elsevier Inc. All rights reserved. [References: 16]
摘要：
In this Letter, we study BAM (bidirectional associative memory) networks with variable coefficients. By some spectral theorems and a continuation theorem based on coincidence degree, we not only obtain some new sufficient conditions ensuring the existence, uniqueness, and global exponential stability of the periodic solution but also estimate the exponentially convergent rate. Our results are less restrictive than previously known criteria and can be applied to neural networks with a broad range of activation functions assuming neither differentiability nor strict monotonicity. Moreover, these conclusions are presented in terms of system parameters and can be easily verified for the globally Lipschitz and the spectral radius being less than 1. Therefore, our results should be useful in the design and applications of periodic oscillatory neural circuits for neural networks with delays. (C) 2003 Elsevier B.V. All rights reserved.
摘要：
We have obtained the parameter-phase diagram, which unambiguously defines the parameter region for the use of InAs/GaAs quantum dot as two-level quantum system in quantum computation in the framework of the effective-mass envelope function theory. Moreover, static electric field is found to efficiently prolong decoherence time. As a result, decoherence time may reach the order of magnitude of milli-seconds as external static electric field goes beyond 20 kV/cm if only vacuum fluctuation is taken as the main source for decoherence. Our calculated results are useful for guiding the solid-state implementation of quantum computing.
关键词：
Coupled MKdV equation;Coupled KdV equations;Exact solutions;Trigonometric function transform method
摘要：
In this Letter, more exact solutions for a new coupled MKdV equations are obtained by using a direct and efficient trigonometric function transform method based on the idea of the homogeneous balance method. The corresponding exact Solutions for a coupled KdV equations are obtained by Miura transformation, with the aid of Mathematica. (C) 2002 Elsevier Science B.V. All rights reserved.
摘要：
More new exact solutions for a class of nonlinear coupled differential equations are obtained by using a direct and efficient trigonometric function transform method based on the idea of the homogeneous balance method. (C) 2002 Elsevier Science B.V. All rights reserved.
期刊：
Nuclear Science and Engineering,2001年137(1):89-95 ISSN：0029-5639
通讯作者：
Fan, S
作者机构：
[Fan, S] Peking Univ, Dept Tech Phys, Beijing 100871, Peoples R China.;China Inst Atom Energy, Beijing 102413, Peoples R China.;Natl Lab Heavy Ion Accelerator, Lanzhou 730000, Peoples R China.;CCAST, World Lab, Beijing 100080, Peoples R China.;Yiyang Teachers Coll, Hunan 413049, Yiyang, Peoples R China.
摘要：
The analyses and results of the application of quantum molecular dynamics plus fission model to intermediate-energy-proton-induced reactions on <sup>208</sup>Pb are described. The mass distribution of residual nuclei and spallation fragments induced by protons incident on <sup>208</sup>Pb with energies of 322, 660, 759, and 1600 MeV are investigated, and the results are found to be in good agreement with experimental data.
