Magnetic Field Stabilization for Magnetically Shielded Volumes by External Field Coils

For highly sensitive magnetic measurements, e.g., a measurement of the neutron electric dipole moment (EDM), the magnetic field has to be stable in time on a level below picoTesla. One of several measures we employ to achieve this uses an external field coil system which can stabilize the ambient external field at a predefined value. Here we report on the construction and characterization of such a system in the magnetic test facility at PSI. The system actively stabilizes the field along the axis of the EDM experiment by means of four coils in a Helmholtz-like configuration. Additional coils serve to compensate for transverse ambient field components. Because of the long integration times in the EDM experiment (about 100 s or more) only slow disturbances have to be corrected for. The performance of the system has been measured using static and moving magnetic sources and suppression factors in excess of 200 have been observed.     

伦理视野中的经济制度与经济行为

任何一种经济制度或经济行为都要为社会成员提供尽可能多的利益需要,因为社会经济制度和经济行为的根本道德性原则或第一原则就是最大限度地满足社会成员的利益需要.从伦理学的视野来审视现阶段经济制度和经济行为有着重要的理论意义和现实意义.具体的经济行为有着道德的内涵,对它进行道德的评价和判断,有利于规范经济的运行秩序,促进社会主义市场经济的建设.     

基于流场数值模拟的ADS靶件结构的设计优化

采用通用的计算流体力学（CFD）软件PHOENICS 3．3和BFC计算网格生产技术，对加速器驱动次临界系统（ADS）靶件的流场进行数值模拟计算。结果表明：束窗下方导流板起引导流体沿束窗表面流动的作用，消除了束窗两侧下方较大的旋涡，对于改善束窗附近流体的流动结构、提高束窗表面及散裂靶的换热，效果显著。     

浅谈密山灌区水田典型区设计

阐述了密山灌区选择具有代表性的田块进行水田典型区设计的步骤与方法。     

含化学反应体系多相平衡计算方法的研究进展

首先给出了含化学反应体系多相平衡计算问题的数学方程，然后对国内外含化学反应体系多相平衡计算方法的现状和进展做了综述，包括经典的非化学计量系数法和化学计量系数法以及最近提出的稳定性分析法、全局最优法和遗传算法等，并具体介绍了化学计量系数法中两种常用算法-S-C算法和KZ算法以及遗传算法的算法原理和计算步骤。     

Incorporating Ancestors' Influence in Genetic Algorithms

A new criterion of fitness evaluation for Genetic Algorithms is introduced where the fitness value of an individual is determined by considering its own fitness as well as those of its ancestors. Some guidelines for selecting the weighting coefficients for quantifying the importance to be given to the fitness of the individual and its ancestors are provided. This is done both heuristically and automatically under fixed and adaptive frameworks. The Schema Theorem corresponding to the proposed concept is derived. The effectiveness of this new methodology is demonstrated extensively on the problems of optimizing complex functions including a noisy one and selecting optimal neural network parameters.     

The Influence of Magnetic Permeability on the Configuration of magnetic Field in Helimak Device

The Helimak of USA is a plasma physics experimental device designed and built by CASIPP.Its configuration of magnetic field is of very importance during the operation of this device.In this paper,the influence of magnetic permeability on configuration of magnetic field will be discussed due to the effect of weld metal in the vacuum vessel of Helimak,and some conclusion is useful for some engineering designs of the fusion experimental device.     

大型水轮发电机引进灭磁装置存在问题的探讨

本通过对我国近年引进的大型水轮发电机组灭磁装置运行与实验情况的研究，认为有的引进设备无论设计参数的选择还是自身可靠性方面或多或少地存在一些问题，应给以足够重视，在总结的基础上提出解决机组灭磁可靠性的技术方向。     

电厂启动备用变压器继电保护应用分析

针对电厂备用变压器分支较多这一特殊情况,从理论上对保护配置与整定上存在的问题进行了深入分析,提出了切实可行的保护配置和整定计算方法,具有较高的应用价值和推广意义。     

衣型结构设计模式

本文介绍了服装一体结构模式——衣型的结构特征,讨论了服装结构设计方法的发展方向。