基于面积灰关联相对贴近度模型的长三角制造业产业升级研究

借助“制造业高级化”产业升级理论, 从结构优度、价值链高度、环境保护程度三个维度构建制造业产业升级评价指标体系。根据TOPSIS思想, 以被评价对象数列和理想方案指标数列两相邻点间围成图形的面积来表征关联系数, 同时采用标准差修正G1组合赋权原理对指标赋权并进一步计算灰关联相对贴近度; 通过引入时间变量并赋予时间序列权重以实现对长三角制造业产业升级动态评价。研究结果显示:2010至2016年间, 上海市排名最高, 江苏省略高于浙江省, 安徽省最低; 安徽省是长三角制造业产业升级的短板。基于上述结论, 给出长三角制造业产业升级的政策建议。     

Desorption induced by hot electrons: wave packet calculation of CO on Cu surfaces

A quantum mechanical photodesorption model, valid for metallic substrates and sub-picosecond laser pulses, is presented. It takes into consideration the photodesorption coordinate and models the metal hot-electron mediated desorption by a three electronic states: an ionic state of the adsorbate and two effective states representing the continuum of the metal. This multiple-state picture allows the sharing of the flow of energy injected by the laser between the adsorbate and the substrate. For the first time, the present modeling introduces the hot electrons of the metal through an optical potential based on the kinetic model developed earlier by the authors. This potential, and the resulting desorption yield, depend on the laser fluence. For CO on Cu(1 0 0) or Cu(1 1 1), the results are in fair agreement with the experimental findings.     

一种显示器投影成象系统的彩色图象几何畸变校正方法

显示器投影成象系统是解决数字图象输出的一种设备,它可将显示器荧屏上的图象(可来自数码相机、光盘、计算机等)扩印在普通彩色相纸上.由于光学镜头会产生几何畸变,加之显示器表面有一定弧度,因此成象在相纸上的图象存在着非线性的畸变.本文主要介绍了如何用数字图象处理的方法对显示器投影成象系统的图象进行几何畸变校正,并对其软件实现进行了简单的讨论.     

Multi-patch model for transport properties of cuprate superconductors

A number of normal state transport properties of cuprate superconductors are analyzed in detail using the Boltzmann equation. The momentum dependence of the electronic structure and the strong momentum anisotropy of the electronic scattering are included in a phenomenological way via a multi-patch model. The Brillouin zone and the Fermi surface are divided in regions where scattering between the electrons is strong and the Fermi velocity is low (hot patches) and in regions where the scattering is weak and the Fermi velocity is large (cold patches). We present several motivations for this phenomenology starting from various microscopic approaches. A solution of the Boltzmann equation in the case of N patches is obtained and an expression for the distribution function away from equilibrium is given. Within this framework, and limiting our analysis to the two patches case, the temperature dependence of resistivity, thermoelectric power, Hall angle, magnetoresistance and thermal Hall conductivity are studied in a systematic way analyzing the role of the patch geometry and the temperature dependence of the scattering rates. In the case of Bi-based cuprates, using ARPES data for the electronic structure, and assuming an inter-patch scattering between hot and cold states with a linear temperature dependence, a reasonable agreement with the available experiments is obtained. Received 3 August 2001 and Received in final form 1st November 2001     

A first experimental approach to the 15O + α elastic scattering

The ¹⁵O(α,α)¹⁵O elastic scattering is investigated using a ¹⁵O radioactive beam and a He gas cell limited by Mylar windows. The width of a ¹⁹Ne state at an excitation energy of 5.35MeV is measured as Γ_α = 3.2±1.6keV, in agreement with charge symmetry estimate.     

一种实用化实时测温系统工作波长优化设计的进一步分析

基于Kirchhoff定律,依照测温系统的各主要技术参数与各主要技术指标(温度分辨力、测温灵敏度、相对测温灵敏度及测温准确度)之间的关系,对利用激光并采用钽酸锂热释电探测器作光电转换器件的实用化实时测温系统的工作波长进行了进一步的优化设计.实验表明,在测温范围400~1200 ℃内,系统的测温误差符合设计要求.     

密立根油滴实验数据的计算机处理

本文主要给出了利用VB编制的处理密立根油滴实验数据的程序,解决了数据处理的复杂计算的问题,利用该程序软件处理测定的电子电量值与标称值符合得较好,使该实验可以作为综合实验安排．     

On an approach to the study of the Jaynes–Cummings sum in quantum optics

A new approach to the study of the Jaynes–Cummings sum, which determines the atomic inversion in quantum model of a single two-level atom interacting with a single mode of the quantized radiation field, based on the number theory theorems on approximation of trigonometric sums is presented.      

On the graph of a function in two variables over a finite field

We show that if the number of directions not determined by a pointset of , of size q² is at least p^e q then every plane intersects in 0 modulo p^e+1 points and apply the result to ovoids of the generalised quadrangles and .