Analysis of magnetotail flux rope events by ARTEMIS observations

Three earthward flowing magnetic flux ropes observed in the duskside plasma sheet at geocentric solar magnetospheric coordinate X~–55 Re by P1 and P2 of acceleration,reconnection,turbulence and electrodynamics of moon’s interaction with the sun mission during 13:00–15:00 UT on July 3,2012,were studied.The morphologies of the flux ropes were studied in detail based on Grad-Shfranov reconstruction method and electronic pitch angle distribution data.It is found that(1)the flux rope cross-sectional dimensions are 1.0 Re×0.78 Re,1.3 Re×0.78 Re,and 2.5 Re×1.25 Re,respectively.The magnetic field lines were asymmetric about the center with field line compression on both sides of the current sheet at the leading region;(2)the electron energy flux data presented asymmetry with larger electron flux and lower temperature in the precursor region.The flux ropes were blocked by the resistance of compressed particle density in the front central plasma sheet and the enhanced magnetic field on its sides;and(3)it is found that the flux rope has a layered structure.From inside out,event 1 can be divided into three regions,namely electronic depletion core region,closed field line region,and the caudal area possible with fields connected with the ionosphere.It suggests that the flux ropes cannot merge with the tail magnetic field lines near the lunar orbit.Especially,the flux rope asymmetrical shape reflects the different reconnection processes that caused it on both sides of the magnetic structure.The events shown in this paper support the multiple X-line magnetic reconnection model for flux ropes with in situ observations.     

Regularization of B-Spline Objects

By a d-dimensional B-spline object (denoted as Od), we mean a B-spline curve (d=1), a B-spline surface (d=2) or a B-spline volume (d=3). By regularization of a B-spline object Od we mean the process of relocating the control points of Od such that it approximates an isometric map of its definition domain in certain directions and is shape preserving. In this paper we develop an efficient regularization method for Od, d=1,2,3, based on solving weak form L²-gradient flows constructed from the minimization of certain regularizing energy functionals. These flows are integrated via the finite element method using B-spline basis functions. Our experimental results demonstrate that our new regularization methods are very effective.     

一种新的构建GS曲线砂岩储层地震预测的方法

目前描述砂岩储层主要是基于测井约束反演的方法,而实际应用中由于地下地质条件的复杂程度导致了测井声波不能较好的识别砂岩,即储层与围岩的速度相当,利用这种测井声波进行约束反演时,获得的声波阻抗难于识别砂岩储层的分布,预测结果存在着较大的误差;当地层不含泥质以外的放射性物质时,自然伽玛能够较好的识别砂岩,本文提出利用改造的Z-score法结合自然伽玛重新刻度的声波曲线GS(Gamma Sonicwave简称GS曲线)可以较好的识别砂岩。实际应用表明,用GS曲线做约束反演,反演结果可以较为准确的预测砂岩储层。     

重组HIV-1 CN54 Nef抗原的制备及鉴定

目的原核表达HIV-1CN54调控蛋白Nef,并进行纯化、复性及鉴定。方法将CN54 Nef基因克隆至pThio-HisA载体,构建非融合表达载体,转化大肠杆菌BL21 Codonplus-RIL,IPTG诱导表达,通过尿素梯度洗涤包涵体纯化Nef蛋白,透析复性。Western blot检测目的蛋白的特异性。结果Nef蛋白以包涵体的形式表达,表达量占菌体总蛋白的40%以上。用尿素洗涤法可直接纯化Nef,纯度达到90%以上。Nef蛋白透析后溶解于PBS缓冲液中。Western blot检测显示了良好的特异性。结论HIV-1 CN54 Nef抗原蛋白可在大肠杆菌中高效表达,采用的纯化和复性Nef蛋白的工艺简便、快捷,为开发针对Nef基因的HIV-1疫苗奠定了基础。     

生长液滴法Lix54-100萃铜的动力学

采用改进的生长液滴法,研究氨性条件下Lix54-100萃铜的动力学,考察了萃取剂浓度、水相铜离子浓度、pH值等对萃取初速的影响,Lix54-100萃铜的动力学方程为:R0=k[HL]o. 萃取剂进入水相发生构型改变,速度较慢,是整个萃取过程的控制步骤.     

TMS320C54X DSP软件实现UART技术

基于目前TMS320C54X高速DSP芯片缺少UART标准接口,与带UART的外设直接进行异步通信比较困难的问题.介绍了一种用软件模拟实现UART方法,该方案采用最少的外部硬件电路,简单方便,灵活可靠;根据实际经验,给出了利用示波器观察UART收发数据的波形,并根据观察的结果,提出了对UART进行调试的两种方法.     

应用GS1系统,实现玩具产品跟踪与追溯

本文介绍了利用GS1系统,通过在玩具产供销中的各个节点及参与方进行有效的标识应用,从而实现玩具产品的跟踪与追溯,有效实现了玩具产品内部质量控制及责任回查,确保质量事故产品召回的实施.     

太阳能跟踪控制器硬件设计

为了实现对太阳能全面而且有效率的使用,常用的方法是跟踪太阳的方位角,从而增加太阳能吸收的输出功率。这篇文章描述了太阳能跟踪控制器的控制思想,以及系统硬件组成控制算法。通过这种简易跟踪控制器的设计以及双轴太阳能跟踪控制器的可靠控制,可以实现太阳能利用率的提高。而且,通过手电筒模拟太阳光源,可以证明的是这个系统可以可靠的工作。整个系统主要由硬件和软件组成,硬件部分包括：单片机89C54RD＋外围电路,8位模数转换电路,光电检测电路,EEPROM电路,LED信号显示电路,供电电路,串行通讯电路等。此外,软件中单片机的控制和主监控程序是基于KeiluVision2．0平台编写的。最后,两个电动的舵机拖动双轴机械装置对太阳光源进行方位角和高度角两个方向的跟踪。     

TMS320C54X软件模拟实现UART技术

ＴＭＳ３２０Ｃ５４Ｘ高速ＤＳＰ芯片由于缺少ＵＡＲＴ标准接口,与带ＵＡＲＴ的外设直接进行异步通信比较困难。本文介绍了一种用软件模拟实现ＵＡＲＴ方法,可以较好解决这个问题。该方法无须额外硬件开销,实验表明：简单文便,灵活可靠。     

利用单片机实现罗经监视器系统的管理

随着电子技术的飞速发展,电子集成化越来越高,许多功能可以集成到一个由单片机控制的小的系统里,从而实现方便科学的管理方法。本文所实现的罗经监视器系统是驾驶台综合导航系统(IBS)的一个子系统,其功能主要是集中显示IBS所接罗经的航向信息并进行实时监控和管理,此系统选用STC 89C54RD 型单片机,通过行列扫描键盘控制一块内置字符的点阵式LCD的显示,并通过RS422进行串口通信,其通信协议为NMEA0183,从而实现对罗经的控制和管理,此系统即罗经监视器系统。