Screeing for Inducement Factors of Bursaphelenchus xylophilus and Nematicides against Bursaphelenchus xylophilus

松材线虫病是松树的一种毁灭性流行病。该病自发生以来,一直扩散蔓延，科研始终没有取得突破性进展，目前尚无行之有效的治疗方法，仍以贯彻“以防为主”的方针。因此对松材线虫病的早期诊断就显得尤为重要。所以作者力图筛选松材线虫的有效引诱物质，以提高松材线虫病早期检测管效能；同时试验各种杀线虫物质，为杀灭感病树体内的松材线虫和处理疫木寻找有效的药剂。1松材线虫有效诱引物质的筛选本实验选取马尾松(Pinusmassoniana)、苦楝(Meliaazedaeach)、桑树(Morusalba)和蒲葵(Livistonaaltissima)4种植物，各取其叶、枝和果，分别采用研磨、浸泡或煮沸的方法提取其中的有...Pine wilt disease is a fatal epidemic disease for pine trees and it has continuously spread since it took place. However, there hasn’t been any breakthrough and the most effective measure for now is focusing on prevention. So, the early diagnosis for pine wilt disease is of paramount importance. Therefore, this study aimed to screen Bursaphelenchus xylophilus-inducing substances in order to enhanc...学位：理学硕士院系专业：生命科学学院生物学系_动物学学号：2012005130199

网格计算中基于信任机制的动态任务调度

提出了一种基于信任机制的动态任务调度模型, 该模型通过MDS (Monitoring and Discovery Service)和NWS(NetworkWeather Service)组件完成资源信息的收集与反馈, 并借鉴现实人 类社会中人与人之间的信任关系模型引入信任机制, 对数据存储系统采用DSRL ( Dynamic Self-adaptive distributed Replica Location)方法, 对出错节点上的任务采用动态迁移方法。在任务调度策略 中对Min-min算法进行改进, 提出了基于信任机制的Trust-Min-min算法, 提高了网格计算的有效性。 最后, 采用SimGrid工具包对该模型和算法进行了仿真, 验证了算法的合理性和高效性

Design and measurements of the high gradient accelerating structures

The purpose of this thesis was to study on design and measurements of the high gradient accelerating structures. After introducing the main parameters to characterize Linacs we explained the application of the periodic accelerating structure. Then we studied TW accelerating structure operating at K-band frequency in order to linearize longitudinal space phase to increase beam brightness in the framework of the Compact Light XLS project in order to produce hard x-ray. We estimated group velocity as a function of frequency both analytically and numerically. Analytical results have a good agreement with the numerical results. The main parameters such as shunt impedance, quality factor (Geometric factor) and R/Q independently from the operating frequency for the TM010, TM110 and TM011 for a single cylindrical “pill-box” have been determined analytically as they provide accurate model for the accelerating structures. In order to characterize a normal conducting high accelerating structure with maximum gradients operating at X-band with extremely low probability of RF breakdown, an electroformed SW structures has been fabricated and characterized by SLAC and INFN with collaboration of other institute around the world at 11.424 GHz, coated with Au-Ni. We designed a gold plate RF high gradient structure operating at the X- band coated with Au-Ni. Bench measurements have been performed in the Department of SBAI of the University of Rome “La Sapienza”. The Slater method for the SW cavity has been employed in order to quantify the electric field inside the structure. Comparing the results with the results exposed from HFSS we report the features that have been quantified, showing good agreement. We continued working on the perturbation effect due to the aperture coupled between a waveguide and a cavity but for our application in SW multi-cell high gradient accelerating structure we studied on theoretical approach for reflection coefficient calculation in a SW cavity coupled to a waveguide. One method was based on circuit theory in which we found the overall Q of a resonant circuit for a cavity coupled to an external waveguide containing the RF generator. Q calculation led to the determining of the shunt impedance and consequently the reflection coefficient calculation. Comparison of the results shows a good agreement with the numerical results carried out by using the numerical code, HFSS. Another method of reflection coefficient calculation has been accomplished. We applied the modified Bethe’s theory presented by Collin and developed by De santis, Mostacci and L.Palumbo for TM01 mode cavities coupled by a small hole with a thickness size comparable to the wavelength. The amplitudes of forward and backward waves due to polarizabilites have been determined and we found equations for reflection and transmission coefficients. We demonstrated that our equation for reflection coefficient calculation is an analogous of the reflection coefficient obtained by Collin for TE10 using the circuit theory

全固化Nd:YVO_4绿光激光器

本文介绍了一种新型微型全固化绿光激光器。采用激光二极管端面泵浦nd：yVO4激光晶体，用kTP作为非线性倍频晶体，当泵浦光功率为360MW时，获得530nM波长、93MW的基横模绿光输出，总的光-光转换效率为24%

智能教学系统研究综述

介绍了智能教学系统的发展历史和国内外发展情况,对于智能教学系统研究存在的问题进行了探讨, 并就智能教学系统的发展趋势提出了自己的看法。福建省科技厅青年科技人才基金资助项目(2007F3103) ;福建省教育厅资助 项目( JA08222) ;厦门市科技计划指导性项目(3502Z20089040

Determination of 24 Trace Level of Rare Earth and Metal Elements in Coastal and Estuarine Seawater by Polymer Complexation-Ultrafiltration Technique and Inductively Coupled Plasma Mass Spectrometry

建立了聚丙烯酸螯合-超滤(PCP-uf)分离富集、电感耦合等离子体质谱(ICP-MS)测定海水中痕量稀土及金属元素的方法。PH值高于7.5时,海水中的稀土离子、Cu2+、Pb2+、Cd2+、CO2+、nI2+等与聚丙烯酸(PAA)形成稳定的高分子螯合物,经超滤截留、硝酸解离后,实现了稀土及金属元素从海水中的分离、富集;采用ICP-MS的全定量数据采集模式、内标校正的标准校正曲线法对待测元素进行定量分析。在优化实验条件下,方法的相对标准偏差(rSd)为1.7%~7.3%,加标回收率为73%~96%;方法的定量下限(lOQS,10σ)为0.23~13.9 ng/l,方法空白为0.09~8.38 ng/l。建立的方法可用于近岸及河口海水中痕量稀土及金属元素的同时测定。A method of polyacrylic acid-complexation and ultrafiltration for matrix modification and inductively coupled plasma mass spectrometry(ICP-MS)was developed for the determination of 24 trace level of rare earth elements(REEs) and metal elements in coastal and estuarine seawater.REEs ions,Cu2+,Pb2+,Cd2+,Co2+,Ni2+ could reacted with polyacrylic acid(PAA) to form stable complexes when the pH value was above 7.5,which could be separated and enriched absolutely after trapped and eluted from the ultrafilter.Full quantitative data collection mode and internal standard calibration curve were used for the ICP-MS determination.Under the optimized conditions,the relative standard deviations(RSDs) were in the range of 1.7%-7.3%,and the spiked recoveries were between 73% and 96%.The limits of quantitation(LOQs,10σ) ranged from 0.23 ng/L to 13.9 ng/L.The method blank ranged from 0.09 ng/L to 8.38 ng/L.The developed method could be applied in the simultaneous determination of REEs and metal elements in coastal and estuarine seawater.厦门大学近海海洋环境科学国家重点实验室自主创新项目(MELRI0703

Numerical modeling and biomechanical analysis of the human mitral valve

目的建立人体心脏二尖瓣仿真模型,模拟二尖瓣闭合的工作过程,分析二尖瓣各组件应力分布,探讨二尖瓣瓣叶和腱索的相互作用,并探寻腱索受力大小与腱索粗细之间的相关性。方法构建二尖瓣几何模型,在此基础上定义模型单元类型、材料属性、接触、载荷及约束,建立有限元模型,计算模型的应力、速度和位移等参数。结果瓣膜上的应力分布不均匀,后瓣叶亚区之间的裂口位置所受应力最大;不考虑腱索连接至瓣叶时,瓣叶负载后外翻至心房一侧;考虑腱索连接至瓣叶时,前、后瓣叶关闭良好;各腱索受力不同,与前瓣叶相连的支持腱索受力最大,腱索受力大小与腱索粗细之间的线性相关系数为0.954。结论瓣叶中心和后瓣叶亚区之间的裂口两处应力较大区域是临床上二尖瓣裂的常发生部位;与瓣叶相连的腱索可在瓣叶负载时,施加牵拉力使瓣叶不致发生翻转,前、后瓣叶恰好关闭;解剖结构粗壮的腱索受力较大。Objective To establish a numerical model of human mitral valve and simulate its closing process,so as to analyze stress distributions on the valve apparatuses,study the interaction between leaflets of mitral valve and chordae tendineae,and explore the relationship between the force of chordae tendineae and their thickness.Methods A geometric model of human mitral valve was constructed.On the basis of the geometric model,the finite element model was established by defining the element type,material attributes,contacts,loads and constraints.Parameters such as stress,velocity and displacement were calculated after solving the model.Results The stress distribution on the valve was non-uniform.The clefts between the scallops in the posterior leaflet were always under the highest load.When no chordae tendineae were attached,the leaflets turned over to the side of the atrium.When chordea tendineae were attached,the anterior and posterior leaflet could close up successfully.Different chordae tendineae applied different forces to the valve.The strut chorea tendineae attached to the anterior leaflet applied highest force among all the chordea tendineae.The correlation coefficient between the thickness of chordae tendineae and their force was 0.954.Conclusions The two zones with higher stresses,namely the center of the leaflet and the clefts between the three scallops in the posterior leaflet,are also the positions of mitral valve cleft in clinic.Chordea tendineae can apply the pulling force on the leaflets while the mitral valve is under load,thus the leaflets won't turn over to the side of atrium and the valve can close up in time.Chordea tendineae with thicker anatomic structure always apply a higher force on the leaflets.国家自然科学基金资助项目(61102137); 福建省自然科学基金资助项目(2011J01366); 福建省创新医学科研基金(2009-CXB-59

LED Color Analysis

主要对蓝光、绿光、白光lEd的色度特性进行分析,首先通过单色仪,分别测得蓝光、绿光、白光lEd的相对光谱功率分布并以色度学理论为基础,计算出光源主波长、色纯度、色温和显色指数.计算结果表明:蓝光lEd和绿光lEd主波长随标准光源的不同变化不大,色纯度比较高,分别在0.64和0.87左右,一般显色指数为-29和-14,显色性很差,不适合用来做照明光源.白光lEd主波长随标准光源的不同变化较大,色纯度相当低,接近0,一般显色指数为82,显色性很好,完全符合照明光源的要求.In order to study the color characteristics of light-emitting diode,the characteristics of blue,green and white LED colors are analyzed.Firstly,the spectral power distribution of blue,green,white LED is respectively measured by using the monochromator,and then on the basis of the theory chroma,the main light source wavelength,color purity,color temperature and color rendering index are calculated.The results show that blue LED and green LED dominant wavelengths change little with different standard light sources,and the color purities are relatively high,at 0.64 and 0.87,respectively,the general color-rendering is very poor for the index of-29 and-14,so these blue and green LED are not suitable to be used as lighting source.White LED dominant wavelength largely change with different standard light sources,and color purity is relatively low,near 0,color rendering is good for the general color-rendering index of 82, so white LED is in full conformance with the lighting requirements

沙格列汀治疗2型糖尿病病人致心衰风险的荟萃分析

目的:系统评价2型糖尿病病人用沙格列汀治疗与心衰风险的相关性。方法:检索中文科技期刊全文数据库(维普)、万方数据-数字化期刊群、中国期刊全文数据库(中国知网)、PubMed和Cochrane library建库至2017年12月的相关文献。按Cochrane系统评价法筛选沙格列汀致心衰的所有随机、对照临床试验(RCT),将纳入的文献进行数据提取和质量评价后,应用RevMan 5.3软件进行meta分析。结果:共纳入11篇文献,meta分析结果显示:沙格列汀致心衰的风险高于对照组,差异有统计学意义[RR=1.20,95%CI(1.02,1.42),P=0.03]。进一步研究发现,5mg/d沙格列汀单药或联合治疗致心衰的风险高于对照组,差异有统计学意义[RR=1.24,95%CI(1.05,1.46),P=0.01];2.5、10mg/d沙格列汀无论单药或联合治疗致心衰的风险与对照组比较均无显著性差异[2.5mg/d沙格列汀RR=0.69,95%CI(0.31,1.55),P=0.37;10mg/d沙格列汀RR=0.18,95%CI(0.02,1.67),P=0.13]。结论:使用5mg/d沙格列汀治疗可增加心衰风险,而其他剂量的沙格列汀均未发现增加心衰的风险。沙格列汀治疗2型糖尿病的远期安全性需进行更多大样本、高质量、长期随访的RCT加以验证