乳酸环丙沙星的荧光特性及其应用

本文对乳酸环丙沙星的荧光特性进行了研究,研究发现,该物质在０．１ｍｏｌ／Ｌ盐酸介质中有很强的荧光性质,其激发波长为２８５ｎｍ和３３０ｎｍ,发射波长为４５０ｎｍ,乳酸环丙沙星浓度在５×１０－９—１×１０－６ｍｏｌ／Ｌ范围内与荧光强度呈线性关系。用荧光法测定注射液中乳酸环丙沙星的含量,方法简单,快捷、灵敏度高。结果令人满意。     

络合沉淀法制备茶多酚工艺中络合剂的循环利用及Fe3+影响

络合沉淀法制备茶多酚工艺中络合剂的循环利用及Fe3+影响;茶多酚;络合沉淀法;络合剂的循环利用     

Preconditioning bandgap eigenvalue problems in three-dimensional photonic crystals simulations

To explore band structures of three-dimensional photonic crystals numerically, we need to solve the eigenvalue problems derived from the governing Maxwell equations. The solutions of these eigenvalue problems cannot be computed effectively unless a suitable combination of eigenvalue solver and preconditioner is chosen. Taking eigenvalue problems due to Yee’s scheme as examples, we propose using Krylov–Schur method and Jacobi–Davidson method to solve the resulting eigenvalue problems. For preconditioning, we derive several novel preconditioning schemes based on various preconditioners, including a preconditioner that can be solved by Fast Fourier Transform efficiently. We then conduct intensive numerical experiments for various combinations of eigenvalue solvers and preconditioning schemes. We find that the Krylov–Schur method associated with the Fast Fourier Transform based preconditioner is very efficient. It remarkably outperforms all other eigenvalue solvers with common preconditioners like Jacobi, Symmetric Successive Over Relaxation, and incomplete factorizations. This promising solver can benefit applications like photonic crystal structure optimization.     

A structure-preserving doubling algorithm for quadratic eigenvalue problems arising from time-delay systems

We propose a structure-preserving doubling algorithm for a quadratic eigenvalue problem arising from the stability analysis of time-delay systems. We are particularly interested in the eigenvalues on the unit circle, which are difficult to estimate. The convergence and backward error of the algorithm are analyzed and three numerical examples are presented. Our experience shows that our algorithm is efficient in comparison to the few existing approaches for small to medium size problems.     

地方性本科院校应用化学专业创新创业人才培养模型建构——基于扎根理论的多个案研究

从“高校教师”和“创业成功者”的视角出发,对多个对象访谈获得原始材料。采用扎根理论研究方法进行分析,得出他们对于应用化学专业创新创业人才应具备的需要和人才培养方式的建议。研究提出船式人才培养模型,即以教学反思为推动力,创新、创业为发展方向,实行“知识＋方法＋通识类”课程体系。     

激光导致等离子体空泡及高速离子产生的粒子模拟研究

 用二维半粒子模拟程序PLASIM模拟研究了超强的S极化激光束与过稠密等离子体的相互作用过程，发现等离子体在其表面形成了波纹状结构（等离子体空泡），该现象也称为类瑞利-泰勒不稳定性；发现离子得到很大加速，其相对论动能可以达到72 MeV，并研究了高速离子的分布特点及其产生原因。     

A fast spectral/difference method without pole conditions for Poisson-type equations in cylindrical and spherical geometries

A simple and efficient FFT-based fast direct solver for Poisson-typeequations on 3D cylindrical and spherical geometries is presented.The solver relies on the truncated Fourier series expansion,where the differential equations of Fourier coefficients aresolved using second-order finite difference discretizationswithout pole conditions. Three different boundary conditions(Dirichlet, Neumann and Robin conditions) can be handled withoutsubstantial differences.     

Theoretical studies of the structures and properties of (Br<Subscript>2</Subscript>InN<Subscript>3</Subscript>)<Subscript><Emphasis Type="Italic">n</Emphasis></Subscript> (<Emphasis Type="Italic">n</Emphasis> = 1–6) clusters

In an attempt to find single-source precursors, a series of small clusters of inorganic azides of indium (Br₂InN₃) _n (n = 1–6) were studied using the dispersion correction density functional theory (wB97XD). The obtained (Br₂InN₃) _n (n = 2–6) clusters have the core structures of 2n-membered ring with alternating indium and α-nitrogen atoms. The influences of cluster size (oligomerization degree n) on the structures, energies, IR spectra, and thermodynamic properties of clusters were discussed. The computed binding energies indicate the stability: 3A > 3B, 4B > 4C > 4A > 4D, 5E > 5D > 5B = 5C > 5A and 6I > 6C > 6D > 6G ≥ 6H > 6F > 6E > 6B > 6A. It is also found that (Br₂InN₃)₂ and (Br₂InN₃)₄ clusters possess higher stability than their neighbor sizes judged by the calculated second-order difference of energies (Δ₂ E). Meanwhile, thermodynamic properties for (Br₂InN₃) _n (n = 1–6) clusters increase with the increasing temperature and oligomerization degree n, and the oligomerizations are thermodynamically favorable at temperatures up to 800 K.     

An inexact inverse iteration for large sparse eigenvalue problems

In this paper, we propose an inverse inexact iteration method for the computation of the eigenvalue with the smallest modulus and its associated eigenvector for a large sparse matrix. The linear systems of the traditional inverse iteration are solved with accuracy that depends on the eigenvalue with the second smallest modulus and iteration numbers. We prove that this approach preserves the linear convergence of inverse iteration. We also propose two practical formulas for the accuracy bound which are used in actual implementation. © 1997 John Wiley & Sons, Ltd.