Study of Position System Based on Acceleration Sensor

随着微机电技术的发展，微型惯性测量组合(MIMU：Micro-inertialmeasurementunit)已经显现出了其优异的性能，而加速度测量在微惯性测量组合中具有极其重要的作用。通过加速度计可以得到载体的运动速度和位置等导航信息，因此开展微惯性测量组合的研究具有十分重要的意义。本文针对以微加速度计ADXL203为核心组成的微惯性测量组合的平面定位系统进行了研究，探讨此微惯性组合的特性和信号。本文主要包括以下几个方面的内容：一、根据加速度计ADXL203的特性，设计了其外围电路。主要有加速度计带宽的设定、加速度计与后续电路的阻抗匹配和加速度计输出信号的滤波处理。二、完成并优化了系统的算法...With the development of MEMS (Micro Electrical Mechanical System), Micro-Inertial Measurement Unit (MIMU) has gradually showed its excellent performance. The measurement of acceleration plays a very important part in the field of Inertial Measurement. By measuring the acceleration of the carrier, the navigation information such as the speed and position of the carrier can be obtained. So it is ...学位：工学硕士院系专业：物理与机电工程学院机电工程系_精密仪器及机械学号：20032900

MEMS-based Micro Inertial Measurement Unit

【中文文摘】叙述了基于MEMS技术的微型惯性测量组合(MIMU)在国内外的发展状况及其应用,简要阐述了MIMU的基本原理和结构并对其优缺点进行了分析,同时也对其发展作了总结与展望。 【英文文摘】This paper describes the development and application of MIMU based on MEMS in and out of the country and investigates its fundamental principle and structure.The advantage and disadvantage of MIMU are analyzed,and at the same time the prospect of MIMU is also discussed

Design of self-test electrode for tunneling-based gyroscope with vibrating cantilever

在微机电系统内建立自检系统是提高系统运行可靠性、安全性的重要手段之一。陀螺仪中的Coriolis力和其他惯性力存在一定的差别,即使在恒定的角速度输入下,Coriolis力也是一种动态变化的力。通过一对平板电极,其中,一个平板电极的边缘按照一定的函数变化,当陀螺仪的悬臂梁振动时,其平板间的静电力的变化能很好地模拟陀螺仪中的Coriolis力,有限元分析结果也表明:应用该方法完全能实现陀螺的自检和测试。One of important way to improve the reliability and safety of MEMS is to use a built-in self-test.There are some differences between Coriolis force and other inertial force in gyroscope.The Coriolis force is dynamic,although the angular rate is constant.A pair of plate electrodes is used,the boundary of one of them changes according to a special function.When the gyroscope's cantilever oscillates,the electrostatic force between the two plate electrodes can perfectly simulate the Coriolis force in qyrosoope.The result of finite element analysis(FEA) also indicates this design can be used to realize the aim of self-testing in the gyroscope.国家自然科学基金资助项目(50275127);; 福建省自然科学基金资助项目(A0110003);; 福建省科技计划重点资助项目(2002H022

Study on the risk factors for intrauterine infection of hepatitis B virus among pregnant women

目的探讨厦门市孕妇乙型肝炎病毒(hepatitis B virus,HBV)感染情况和HBV宫内感染的影响因素。方法在1; 064名孕妇第一次到医院建立孕产妇保健卡时进行问卷调查并检测其血清乙肝标志物,根据检测结果选择外周血乙型肝炎表面抗原(hepatitis B; surface antigen,HBsAg)阳性的产妇179例随访至其分娩,并采集其分娩时的脐血和胎盘组织。对脐血进行HBsAg和HBV; DNA的检测,对胎盘组织进行HBsAg的检测。采用chi~2检验和非条件Logistic回归分析相关因素与HBV宫内感染的关系。结果被调查的1; 064名孕妇中,HBsAg阳性的孕妇共179名,感染率为16.8%。对179名HBsAg阳性的孕妇的脐血进行检测发现,发生HBV宫内感染的孕妇共; 34名,感染率为19.0%。孕妇HBV宫内感染的危险因素为胎盘HBsAg阳性、孕妇血清乙型肝炎E抗原(hepatitis B e; antigen,HBeAg)阳性、孕前超重,OR分别为5.123(95% CI:1.422 ~ 18.413)、4.619(95%; CI:1.225 ~ 17.534)、 3.343(95% CI:1.233 ~; 9.092)。结论对于HBsAg和HBeAg双阳性的超重/肥胖孕妇,其新生儿可能发生HBV宫内感染,应加强自身防护措施,合理规避HBV宫内感染风; 险。Objective To investigate the prevalence of hepatitis B virus (HBV); infection in pregnant women and the risk factors for Intrauterine; infection of HBV among pregnant women in Xiamen. Methods Total 1 064; pregnant women were included in this study. A questionnaire was; performed to collect the general information of the subjects and HBV; infection status was tested on the first day when they came to the; hospital. Then HBsAg positive pregnant women were selected and followed; until delivery. We collected their cord blood and placenta tissue when; they delivery. HBsAg and HBV DNA in cord blood and HBsAg in placental; tissue were detected. Chi-square test and the non-conditional Logistic; regression analysis were conducted to investigate the correlation; between HBV intrauterine infection and risk factors. Results 179 out of; the 1 064 pregnant women were HBsAg positive. The infection rate was; 16.8%. 34 out of 179 HBsAg positive pregnant women were found; intrauterine transmission with a rate of 19.0%. The risk factors for the; occurrence of HBV intrauterine transmission were placenta HBsAg positive; (OR = 5.123, 95% CI:1.422-18.413),mothers with hepatitis B e; antigen(HBeAg) positive (OR = 4.619, 95% CI:1.225-17.534) and; overweight(OR = 3.343, 95% CI:1.233-9.092), respectively. Conclusions; Placenta HBsAg positive,mothers with HBeAg positive and overweight are; independent risk factors for the occurrence of HBV intrauterine; transmission.国家自然科学基金; 厦门市科技计划项

血管内皮生长因子表达与肝癌患者临床病理特征及预后的关系研究

目的:研究肝细胞肝癌(HCC)组织中血管内皮生长因子(VEGF)表达与患者临床病理特征及预后的关系。方法:采用免疫组织化学染色法检测79例在广西医科大学附属肿瘤医院行肝癌根治性切除术的HCC患者癌组织中VEGF的表达情况,分析VEGF表达与树突状细胞(DC)浸润程度、肿瘤大小、癌栓、包膜、血清AFP水平及术后肝外转移的关系,随访患者术后生存情况及肿瘤复发情况。结果:79例HCC患者中,VEGF低表达43例(54.4%),高表达36例(45.6%)。VEGF表达与DC浸润程度、肿瘤直径及血清AFP水平有关(P0.05)。VEGF高表达组2年内复发率为83.3%(30/36),明显高于VEGF低表达组的60.5%(26/43),差异有统计学意义(P0.05)。结论:VEGF与癌组织DC浸润程度、肿瘤直径及血清AFP水平有关,其在HCC组织中高表达可能增加肝癌术后短期复发风险,可作为肝癌早期复发预警指标

基于均匀设计的祛湿化瘀方防治脂肪肝不同作用环节的主效应中药剖析

目的:以对实验性脂肪肝有显著防治作用的祛湿化瘀方为切入点,探索中药复方多途径、多环节药理作用的相应物质基础的研究方法。方法:采用CCl4复合高脂低蛋白饮食诱导的大鼠脂肪肝模型,运用"均匀设计法",根据复方中的5味中药(茵陈、栀子、虎杖、田基黄、姜黄),选用U11(1110)表进行组方设计所得10种组合进行干预,分别以肝甘油三酯(triglyceride,TG)、血清丙氨酸氨基转移酶(alanine aminotransferase,ALT)、丙二醛(malonyl-dialdehyde,MDA)为不同病理环节的考察指标,根据回归方程获得针对上述不同指标所提示的最佳效应中药或某种配伍组合,并根据其提示的效应中药或组合,重新分组实验进行验证。结果回归方程显示,降低肝脏TG的最佳效应组合是茵陈0.07g、田基黄0.05g、栀子0.17g、姜黄0.03g,降低ALT的最佳效应组合是茵陈0.33g、虎杖0.25g、田基黄0.25g、姜黄0.17g。而针对MDA未获得回归方程。验证实验证实了上述"筛选"结果的可靠性。结论:①均匀设计是可靠的剖析某一病理环节主效应中药或配伍组合的分析方法;②在整体实验水平,针对某一指标环节的最佳效应中药仍以中药配伍组合方式出现,也说明了中药配伍复方针对复杂病理变化的科学性

木麻黄基干林带后的风速变化规律和空间分布

以木麻黄基干林后沿风速为研究对象,从2006年11月到2007年3月在东山岛调查了不同发育阶段的木麻黄基干林后有效防护距离内的风速。结果表明:基干林带后风速总体上呈上升趋势,但在5h-10h有所下降,10h后风速一直上升,直到25h处接近于空旷地;空间分布呈平滑的上升曲面,局部有凸起和下凹区域,等值线分布疏密相间,局部区域弯曲不直。国家“十一五”科技支撑计划项目(2006BAD03A14-01);; 福建省重大科技专项(2006NZ0001-2

螺内酯联合贝前列腺素钠对2型糖尿病肾病患者肾功能的影响

目的探讨贝前列素钠联合螺内酯治疗2型糖尿病肾病的临床研究。方法选取2型糖尿病肾病患者94例,按照随机数字表法随机分为观察组47例与对照组47例。对照组采取单用贝前列素钠治疗,观察组在对照组基础上结合螺内酯联治疗。比较两组治疗前后尿素氮、血肌酐、24 h尿微量清蛋白(m ALB)和肾小球滤过率(GFR)变化。结果观察组总有效率(93.62%)高于对照组(72.34%)(P <0.05)。两组治疗后尿素氮和血肌酐水平均降低(P <0.05);观察组治疗后尿素氮和血肌酐水平低于对照组(P <0.05)。两组治疗后mALB降低而GFR上升(P <0.05);观察组治疗后m ALB低于对照组而GFR高于对照组(P <0.05)。结论贝前列素钠联合螺内酯治疗2型糖尿病肾病患者疗效显著,能改善患者肾功能

汞和铬对黄鳝的急性毒性研究

于水族箱内进行汞和铬对黄鳝(Monopterus albus)的急性毒性试验。Hg2+的48 h、96 h LC50分别为1.20、0.67 mg/L;Cr6+的48 h、96 h LC50分别为88.21、60.55 mg/L;安全浓度分别为0.067 mg/L和6.055mg/L,汞的毒性远大于铬。泉州师范学院校自选科研项目(2004KJI04);; 国家自然科学基金(40476040);; 福建省自然科学基金(D0410006

Survey and Evaluation of Heavy Metals, Nitrate and Nitrite Contamination in Vegetables in Xiamen's Market

为了解厦门市蔬菜中有害重金属、硝酸盐和亚硝酸盐的污染情况,于2004年8月至2005年12月从厦门市各超市、农贸市场、蔬菜批发市场和蔬菜产地上采集46个品种532份蔬菜样品,用国标法(GB/T5009.11-17-1996、GB/T5009.33-2003)分别分析蔬菜中的重金属、硝酸盐和亚硝酸盐的含量。结果表明,检测样品中Pb、Cd、As、Hg、硝酸盐和亚硝酸盐的平均值分别为0.0099、0.083、0.056、0.003、1090.3、0.59mg/kg;根据国家标准1-2,仅部分品种如菠菜、甘蓝、花菜、萝卜的铅超标,有潜在污染风险;大部分蔬菜中砷、汞、镉三种重金属的含量都较低,潜在的污染风险不大。硝酸盐污染程度严重的占36.5%;中、重度污染的占20.2%;轻度的占43.3%,硝酸盐含量依次为嫩茎叶菜类>根茎类>花菜类>瓜菜类>鲜豆菜>茄果类>水生蔬菜类,各样品间含量差别较大;而蔬菜中亚硝酸盐含量相对较低。The contents of heavy metal (Pd, Cd, As, Hg), nitrate and nitrite in vegetables from the markets and plant fields were investigated in Xiamen. The vegetable samples supplied seasonally were collected during August 2004 and December 2005. 532 samples in 46 groups of vegetables were analyzed according to GB/T5009.11-17-1996 and GB/T 5009.33-2003 to evaluate the status of the contamination. The results showed that the average contents are 0.0099, 0.083, 0.056, 0.003, 1090.3, 0.59 mg/kg for Pb, Cd, As, Hg, NO3-, NO2-, respectively. According to national standards[1-2], the samples of standard exceeding lead contents were found only in some limited vegetables. The potential trend of lead pollution was little. The contents of arsenic, mercury and cadmium in the most samples were very low, the pollution hazards of these three heavy metals were not serious. The prevalence of severe nitrate contamination was 36.5% in samples analyzed, the prevalence of heavy and medium nitrate contamination was 20.2%, the prevalence of mild contamination was 43.3%. The content of nitrate in vegetables was ranked in the following descent order, tender stem and leaf vegetables>root and stem vegetables>inflorescent vegetables>melon vegetables>beans>eggplant and fruit vegetables>water plant vegetables. However the contents in diferent species differed greatly. The nitrite in vegetables was comparably low