矩形截面电磁流量计分布权值研究与分析

电磁流量计广泛的应用在各种气体，液体等流量测量场合，权值函数表征了流体在管道横截面空间各位置上的流体速度对输出电压信号的相对作用，同时也对应了磁场分布的模型建立要求。本文对矩形和圆形截面的权值分布进行分析和性能比对，提出了对传统圆形结构的改进方向。     

The effect of the longitudinal propagating waves on the electron acceleration in the reconnecting current sheet

Based upon the most efficient electron acceleration near the midplane of 3D non-neutral driven reconnecting current sheet (RCS) and the electrostatic wave excitation by the drift Maxwellian distribution of electrons in Vlasov simulation, we assume that the electrostatic waves mainly propagate opposite to the reconnecting electric field and investigated how these waves affect the electron acceleration. The main results are: (1) when the electron’s velocity equals to the phase speed of the waves, they will be trapped and have the different accelerating characteristics from the untrapped electrons through solving the momentum equations of electrons analytically; (2) the test particle simulations further prove that the number of the energetic electrons decreases with the increasing intensity of unstable waves, and the distribution of the energetic electrons takes on the double power-law.     

Estimation of Galactic Cosmic Ray exposure inside and outside the Earth’s magnetosphere during the recent solar minimum between solar cycles 23 and 24

The evidently low solar activity observed between solar cycles 23 and 24 during the years 2008–2010 led to a substantial increase in the Galactic Cosmic Ray (GCR) intensity in comparison with preceding solar minima. As the GCRs consist of highly-ionizing charged particles having the potential to cause biological damage, they are a subject of concern for manned missions to space. With the enhanced particle fluxes observed between 2008 and 2010, it is reasonable to assume that the radiation exposure from GCR must have also increased to unusually high levels. In this paper, the GCR exposure outside and inside the Earth’s magnetosphere is numerically calculated for time periods starting from 1970 to the end of 2011 in order to investigate the increase in dose levels during the years 2008–2010 in comparison with the last three solar minima. The dose rates were calculated in a water sphere, used as a surrogate for the human body, either unshielded or surrounded by aluminium shielding of 0.3, 10 or 40 g/cm².     

方向舵纸基蜂窝芯零件夹持方法研究

采用基于磁场和摩擦吸附原理的纸基蜂窝芯零件夹持方法,以某型号飞机方向舵蜂窝芯零件为对象,研究了区域划分单元的形式以及在确定的铣削条件下Z向变形与蜂窝芯高度的关系,利用实验测试和有限元方法对专用装夹平台进行了设计分析,确定了夹持点的位置以及夹持点的反力,最后给出了设计方案。     

光磁共振测量地磁场的改进方法

根据光磁共振原理,通过光抽运,形成原子的能级分布偏极化,再加入射频信号打破塞曼能级偏极化分布,形成并输出光磁共振信号。然后,同时改变扫场和水平磁场方向,调节水平电流大小,再次获得光磁共振信号。根据2次测得的水平亥姆霍兹线圈电流,计算等效磁感强度。由仪器的垂直电流,计算地磁场垂直分量。二者合成,即可得出当地磁感强度。改进后,此方法克服了以往先测定朗德因子再测定地磁场的缺点。     

磁射流抛光中磁场的分析与设计

介绍了一种新型抛光技术——磁射流抛光中磁场对磁流变液粘度的影响,设计了相适应的磁场形式,重点分析了铁磁喷嘴头部形状对磁场的影响,并通过ANSYS有限元软件仿真了结构形状对磁场空间特性的影响。     

微传感器最新发展

近年来，微传感器受到国际传感技术界的广泛关注，本文介绍十多个微传感器，包括三轴加速度计，单，双轴加速度计片，表面微机械陀螺（角速度传感器），微惯性导航系统，微磁通门传感器，磁阻传感器，纳米皮拉尼压力传感器，微科氏质量流量计，毫米波图像传感器，GPS手表（1cm^3)，二氧化碳传感器和微/超微角位移传感器，文事简要介绍它们的基本结构。敏感机理，特点等，从中可以看出微传感器已成为传感技术中有重要应用前景的组成部分。     

磁悬浮多电发动机的研究

多电发动机是一个新概念的航空动力装置,是现代科技与航空动力科技相结合的方向。本文通过无人机用磁悬浮多电发动机的设计、转子模拟试验研究、辅助轴承试验研究等有关多电发动机部分关键技术的研究和发动机台架试车情况的描述,介绍了磁悬浮多电发动机试验研究概况。     

浅谈电磁兼容技术

本文简单介绍了电磁兼容基本原理、电磁干扰与消除办法。     

磁头加工表面质量与研抛液粒度的关系

研究了纳米金刚石研抛液对磁头进行表面研抛时,纳米金刚石悬浮液的粒度对磁头表面形貌的影响,评价了由该种研抛液抛光所形成的磁头基体表面质量。