Design and Research of a Maglev Ball Control System Based on DSP

磁悬浮技术是集电磁学、电子技术、控制工程、信号处理、机械学、动力学等为一体的典型机电一体化技术。当前，进行磁悬浮技术的研究，可以实现各个学科间的交叉与渗透，推动磁悬浮高新技术产品的开发与应用，因而，具有十分重要的理论和现实意义。 本论文所研究的磁悬浮球控制系统，是常导型磁悬浮系统的一种，也是研究其它常导型磁悬浮系统的基础。论文介绍了磁悬浮球控制系统的组成，分析了其工作原理。为了便于分析与设计，文中建立了控制系统的数学模型。一方面，从经典控制理论的角度，求出了控制系统的传递函数；另一方面，从现代控制理论的角度，建立了被控对象的状态空间表达式。根据数学模型，文中借助MATLAB/Simulink...Maglev technology is a typical electromechanical integration technology which sets electromagnetics, electronics, control engineering, signal processing, mechanics and dynamics of integration. At present, research of maglev technology can achieve cross-infiltration of many disciplines and promote development and application of maglev high-tech products, thus, is of great theoretical and practical ...学位：工学硕士院系专业：物理与机电工程学院机电工程系_测试计量技术及仪器学号：20042902

Effect of ashitaba chalcone on oxidative stress in diabetic rats

目的探讨明日叶查尔酮(AC)对2型糖尿病大鼠氧化应激水平的影响。方法雄性WISTAr大鼠高脂饲料喂养加链脲佐菌素腹腔注射建立2型糖尿病模型,将造模成功大鼠随机分为糖尿病模型组、AC 30、10、5 Mg/kg组及对照组,每日经口灌胃AC连续4周,检测空腹血糖、血清胰岛素、超氧化物歧化酶(SOd)、丙二醛(MdA)、总抗氧化能力、氧化型低密度脂蛋白(OX-ldl)和胰腺组织病理改变等指标。结果糖尿病模型组大鼠血糖与胰岛素水平分别为(17.30±3.57)MMOl/l和(38.28±4.97)Mu/l,MdA和OX-ldl含量分别为(12.00±1.32)nMOl/Ml和(23.05±2.87)ng/Ml,均明显高于对照组(P<0.05),与糖尿病模型组比较,AC 30 Mg/kg组大鼠血糖[(7.00±2.55)MMOl/l]、胰岛素[(29.50±5.31)Mu/l]、MdA[(9.96±0.65)nMOl/Ml]和OX-ldl[(15.36±1.70)ng/Ml]均明显降低,差异均有统计学意义(P<0.05),胰岛细胞损伤程度减轻。结论 AC对2型糖尿病大鼠氧化应激和胰岛细胞损伤有一定抑制作用。Objective To explore the effect of ashitaba chalcone( AC) on oxidative stress in type 2 diabetic rats.Methods Type 2 diabetic rat model was set up in male Wister rats by feeding high-fat diet and streptozotocin( STZ) injection.Rats in AC treatment groups( at dosages of 5,10,and 30 mg / kg) were treated with gavage AC daily.Four weeks later,the fasting blood glucose( FBG),insulin,superoxide dismutase( SOD),malondialdehyde( MDA),total antioxidative capacity( T-AOC),and oxidized low density lipoprotein( ox-LDL) were measured and the morphology of islet cellulars was observed.Results In diabetic model group,the levels of FBG( 17.30 ± 3.57 mmol /ml),insulin( 38.28 ± 4.97 mU /L),MDA( 12.00 ±1.32 nmol/ml),and ox-LDL( 23.05 ±2.87 ng/ml) were significantly elevated compared with those of the control group( P < 0.05 for all).In 30 mg / kg AC group,the levels of FBG( 7.00 ± 2.55 mmol / ml),insulin( 29.50 ± 5.31 mU /L),MDA( 9.96 ± 0.65 nmol / ml),and ox-LDL( 15.36 ± 1.70 ng / ml) were significantly lower than those of diabetic model group( P < 0.05 for all) and the magnitude of morphological damage in islets cellular was also alleviated.Conclusion Ashitaba chalcone could inhibit oxidative stress and injury of islet cells in type 2 diabetic rats.山东省医药卫生科技发展计划项目(QNW001

Research on Designing a Maglev Ball Control System

为了更好地研究磁悬浮技术,根据电磁学理论,对磁悬浮球控制系统的原理进行了分析,建立了控制系统的数学模型,进行了控制系统的稳定性分析;针对磁悬浮球控制系统的滞后特性,提出了PD超前补偿控制方法,组成了闭环反馈控制系统,并在MAT-LAB下进行了控制系统的软件仿真;在此基础上,根据电子学和自动控制理论,设计了一个基于PD控制器的磁悬浮球控制系统,实现了钢球的稳定悬浮;控制系统的电路部分完全由模拟电子电路实现,既简单又实用。In order to research the maglev technique well,the principle of a maglev ball control system is analyzed,including deducing its math model and analyzing its stability.Aiming at the lag characteristic of the control system,a PD lead compensation control method is advanced to compose a closed loop feedback control system,which is simulated by using the MATLAB.Then on the basis of electronics and automation theories,a maglev ball control system based on PD controller is designed which can suspend a steel ball stably.The circuit of the control system is achieved by analog circuit completely,which is simple and practical

SFC引出磁通道

在原有的ＨＩＲＦＬＳＦＣ引出系统基础上，设计了两个无线圈磁通道。一个通道将ＳＦＣ边缘场改变成正梯度的线性分布场，使引出束流在径向聚焦；另一个通道屏蔽一部分边缘场，使引出束向大半径方向偏转；此外，还设计了１２０°对称的假磁通道，以平衡磁通道给ＳＦＣ带来的一次谐波扰动场。实际的测磁结果表明，磁通道达到了设计的理论要求。此设计完善了ＳＦＣ束流引出系统

A Micro High-Speed 1×2 Magneto-Optic Switch

设计和分析了一种新型的用于全光通信网络的高速微型1×2磁光开关,包括光学光路和高速控制.纳秒脉冲发生器的纳秒脉冲电流用于控制传输1550nm光束的磁光晶体的磁化强度.对纳秒脉冲发生器的电路设计方案和纳秒脉冲磁场设计方案分别进行计算机仿真和实验验证.结果表明:纳秒脉冲发生器能够输出上升沿1.9~3.2ns、上升幅度10~90V和脉宽4~100ns的脉冲.在单片机MCU的控制下,可以实现光束的平稳切换,目前的开关时间小于1μs.A novel micro high-speed 1×2 magneto-optic switch, which is used in high-speed all-optical communication network, is designed and analyzed.The study of micro high-speed magneto-optic switch mainly involves the optical route and high-speed control technique design.Nanosecond pulsed current transients from nanosecond impulser are used to switch the magnetization of the magneto-optic crystal,which propagates a 1550nm optical beam. The electronic circuits of nanosecond impulser and the pulsed magnetic field design schemes are both simulated on computer and tested by the experiments respectively.The experiment results state that the nanosecond impulser can output the pulse,with rising edge time 1.3~3.2 ns,voltage amplitude 10~90 V and pulse width 4~100 ns.Under the control of MCU singlechip,the optical beam can be stably switched and the switching time is less than 1μs currently

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兰州放射性核束流线的磁铁与电源

:描述了兰州重离子加速器国家实验室最近建成的兰州放射性核束流线(RIBLL)的磁铁和电源系统的物理设计和性能特点。考虑高阶分量的影响,二级偏转磁铁的入口和出口极面采用二次曲面形状,除使磁铁起偏转作用外,还有聚焦和发散的功能。RIBLL中首次采用大功率开关电源,并获得成

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描述了兰州重离子加速器国家实验室最近建成并已投入运行的新装置———兰州放射性核束流线 (RIBLL) .RIBLL是PF型双消色差反对称结构放射性核束分析设备 ,它的立体角接收度≥ 6 .5msr,动量接受度± 5 % ,最大磁刚度 4 2Tm ,元素分辨>1 5 0 ,质量分辨 >30 0 ,最短分辨时间 <1 μs.初级束流的入射角在 0°～ 5°范围可调 .RIBLL已为第一批物理实验提供17N ,8He等多种放射性核束流 .国家自然科学基金! (批准号 :196 75 0 5 5

塔里木河流域适应气候变化的水热调节技术研究

本成果来自于国家科技支撑计划项目“全球环境变化应对技术研究与示范”之06课题“典型脆弱区域气候变化适应技术示范”之04专题“西北生态脆弱区适应气候变化技术示范”(2007BAC03A06-04)。课题于2007年11月立项,于2010年11月30日通过国家科技部的验收。针对塔里木河流域气候变化影响关键科学问题,建立了山区水库—平原水库联合调节、绿洲地表水—地下水联合开发、膜下滴灌的作物立体种植模式、下游生态恢复与洪水(融雪水)沙漠造林生物固碳等大型原位可控的技术示范基地;构建了区域气候变化优势适应技术筛选与评估流程,集成了塔里木河流域气候变化适应技术行动实施方案与功能区划图,首次提出了塔里木河..