Multiphoton detachment from a zero-range potential revisited

Direct detachment of an electron bound by a regularized zero-range potential is reinvestigated. For the definition of the S-matrix amplitude for detachment, the wave function of the electron after the laser pulse has passed through is projected on an exact scattering state of the zero-range potential rather than a plane-wave state, which is normally used. The exact scattering state generates an additional contribution to the amplitude, which leads to an isotropic term in the angle-resolved energy spectrum.     

Supernova neutrino detection by terrestrial nuclear detectors

We present and discuss differential cross sections for the ^128,130Te isotopes, contents of the COBRA double beta decay detector. The response of these isotopes to energy spectra of supernova neutrinos is explored by convoluting the original results, calculated in the context of the quasi-particle random phase approximation (QRPA) using realistic two-body forces, with a two-parameter Fermi-Dirac (FD) and a Power-Law (PL) neutrino energy distributions.     

广角镜头桶形畸变的二元二次多项式修正法

为了修正广角镜头的桶形畸变,提出了一种基于二元二次多项式的修正方法,阐述了其图像的像素坐标校正和像素灰度恢复方法。该方法首先用模板对广角镜头进行对准相对标定,然后用二元二次多项式拟合畸变图像与非畸变图像像素坐标之间的规律,最后把该方法应用于某广角镜头拍摄的图像,并采用最小二乘法对校正效果进行评价。结果表明:在不考虑视觉系统具体参数的情况下,该方法能够有效地对广角镜头桶形畸变进行修正。     

最小二乘法在铜电阻测量实验数据处理中的应用

文介绍了最小二乘法的原理,给出了用最小二乘法对铜电阻测量数据处理的实例。     

质心袋模型的球腔近似与低能人-N散射

本文引入唯象的夸克禁闭4-矢势及其质心球腔近似,提出了质心袋模型.在静止质心系上它与 MIT袋模型等价;而加上所谓自由度分离规则后,它似能构成自洽的、满足平移不变与洛仑兹协变的场论.它很容易进行量子化,并可导出以前作为假设引入的有关整体口袋-夸克流的计算方法.     

An exact algorithm for solving a capacitated location-routing problem

In location-routing problems, the objective is to locate one or many depots within a set of sites (representing customer locations or cities) and to construct delivery routes from the selected depot or depots to the remaining sites at least system cost. The objective function is the sum of depot operating costs, vehicle acquisition costs and routing costs. This paper considers one such problem in which a weight is assigned to each site and where sites are to be visited by vehicles having a given capacity. The solution must be such that the sum of the weights of sites visited on any given route does not exceed the capacity of the visiting vehicle. The formulation of an integer linear program for this problem involves degree constraints, generalized subtour elimination constraints, and chain barring constraints. An exact algorithm, using initial relaxation of most of the problem constraints, is presented which is capable of solving problems with up to twenty sites within a reasonable number of iterations.     

The estimation of stochastic cost-quantity frontiers for discretionary cost and budgeted-expenditure systems

Two alternative approximating functions for representing the unknown composite residual density function of a cost-quantity frontier are examined. The frontier is one in which cost is regarded as preselected. This is appropriate for public sector economics and discretionary cost situations. One function requires the estimation of a single distribution parameter, whereas the other makes no a priori assumption on the shape of the density function.     

用不同光泽和色差等级的彩色印刷样品检验均匀颜色空间

用不同光泽纸张和不同色差等级彩色印刷样品的目视评价色差数据拟合色度椭圆,研究各均匀颜色空间在评价不同光泽度和色差样本时的表现,检验基于CIELAB,DIN99,OSA和C1ECAM02共7个颜色空间的均匀性.用局部均匀性和全局均匀性因子分别检验不司颜色空间色度椭圆的椭圆度和空间中不同位置椭圆尺寸的一致性.结果表明,其他所有颜色空间的表现均优于CIELAB和OSA颜色空间,OSA-Gp-Eu和DIN99d颜色空间在评价印刷品颜色差异的表现上较为接近,同时优于其他的颜色空间.     

模拟移动床色谱分离技术综述

本文对模拟移动床的建模、模型求解和优化进行了综述,介绍了几种常用的色谱模型以及模型的求解方法和优化策略。在结构优化方面,本文重点介绍了在模拟移动床基础上改进的间歇模拟移动床色谱分离技术。间歇模拟移动床技术通过改变色谱柱的数量来实现分离过程,和常规的模拟移动床技术相比较,它的设计结构简单、成本低,并且比常规的模拟移动床具有更高的分离性能。     

利用小行星视线矢量的火星探测光学自主导航研究

结合我国即将开展的自主火星探测计划,研究了航天器在火星探测巡航过程中利用小行星进行光学自主导航的整个过程. 根据巡航段的设计轨道,给出了导航小行星的筛选条件并筛选出可用于实际任务的导航小行星序列. 将自主导航的数据弧段长度设定为30d,数据观测周期为5d. 采用加权最小二乘滤波算法,当数据弧段长度为30d时,导航计算的位置误差在100～400km变化,速度误差不超过0.25m/s.