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Search Results: 1 - 10 of 118576 matches for " 徐佳龙 "
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目标跟踪相关研究综述
A Survey on Object Tracking
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Artificial Intelligence and Robotics Research (AIRR) , 2015, DOI: 10.12677/AIRR.2015.43003
Abstract:
目标跟踪就是在视频序列的每幅图像中找到所感兴趣的运动目标的位置,建立起运动目标在各幅图像中的联系。本文分类总结了目标跟踪的相关工作,并进行了分析和展望。
Object tracking is a process to locate an interested object in a series of image, so as to reconstruct the moving object’s track. This paper presents a summary of related works and analyzes the characteristics of the algorithm. At last, some future directions are suggested.
用于电动微流体计算模拟的自由界面重构技术比较
Comparison of VOF Free Interface Reconstruction Tracking Techniques for Simulation of Electrokinetic Microfluidics
 [PDF]

, 森本,, 胡帅, 王林刚
International Journal of Mechanics Research (IJM) , 2014, DOI: 10.12677/IJM.2014.32002
Abstract:

电动微流体是微全分析系统中样品输运的主要形式,数值模拟是计算和分析电动微流体样品输运特性的重要手段。由于微通道中区带样品在流体内存在大浓度梯度的界面,在计算时很容易引起数值耗散,对计算精度影响严重。本文探讨了电动微流体样品输运计算中数值耗散的产生原因和消除措施,利用有限体积法求解电场分布和流场分布,在此基础上应用自由界面重构技术对数值流向量进行了处理并求解微通道中样品传输,有效消除了界面处数值耗散的影响,并给出微通道中电泳分离和电致混合增强的计算模拟结果,研究结果表明:采用FCT-VOF和基于积分平均型TVD格式的VOF方法对上述算例的样品界面进行重构,能够保持界面平滑的同时,有效抑制了数值耗散,获得较好的计算精度。
Electrokinetic microfluidics is one of the main subcategories for sample transport in Micro-Total- Analysis-System. Numerical simulation is an efficient method for calculating and analyzing trans- port properties of samples in electrokinetic microfluidics. However, since the strong discontinuity exists at the interface of sample zone, the numerical dissipation near the interface becomes a key problem that can seriously influence the computational accuracy. In this paper, the reasons of numerical dissipation are theoretically analyzed and the techniques based on free interface reconstruction are provided to weaken the numerical dissipation. Firstly, the electric field and the flow field are solved by using the finite volume method. Then, in order to constraint the numerical dissipation, several techniques based on the volume of fluid (VOF) are utilized to reconstruct the flow vectors and solve the sample transport. Lastly, with the developed algorithm, capillary electrophoresis and electrokinetically driven enhanced mixing in microchannels are simulated. The results show that both FCT-VOF and TVD-VOF can significantly constraint the numerical dissipation while keeping the interface smoothing and are suitable for the simulation of electrokinetic microfluidics and other applications.

基于发展权价值评估的太湖东部水源保护区生态补偿标准
陈江,,梦月,陈雯
湖泊科学 , 2012, DOI: 10.18307/2012.0415
Abstract: 生态补偿是协调环境保护与区域发展机会公平的重要手段.太湖东部湖区是苏州市、嘉兴市和上海市重要饮用水源供给地.本文分析了苏州市滨湖地区水源地水质保护行为与发展权价值损失的关系.应用区域比较法,在地理要素修正的基础上评价了太湖东部水源保护区发展权价值损失,以此作为生态补偿的标准.研究表明,2009年太湖东部地区水质保护行为的发展权损失为42.39亿元,地方财政收入损失占75.88%;农民收入损失占13.58%;城镇居民收入损失占10.53%.为了缩小城乡居民的收入差距,应优先对农民实施生态补偿.水质保护行为产生的外部收益超出了水源供给价值,需要在更大范围内统筹生态补偿问题.
粒子的横向运动对环形质谱仪性能的影响
建铭,詹文,,
强激光与粒子束 , 1999,
Abstract: ?分析了粒子的横向运动对环形质谱仪的分辨本领及测量精度的影响,给出了计算这些影响的方法。
饱水对岩溶灰岩力学性质与纵波波速的影响
Influence of water-saturated state on mechanical properties and longitudinal wave velocity of karst limestone

,,李宏飞
- , 2015, DOI: 10.11835/j.issn.1674-4764.2015.02.010
Abstract: 为研究饱水对岩溶灰岩力学性质和纵波波速的影响,进行自然和饱水状态下岩样的力学性能和弹性波测试。试验结果表明:饱水对岩溶灰岩的单轴抗拉强度、抗拉强度和弹性模量有明显的软化作用,饱水状态试样的峰值应变和泊松比整体上大于自然状态的对应值;岩溶灰岩试样在饱水条件下的纵波波速均明显高于自然状态下的纵波波速,试样的单轴抗压强度和抗拉强度与纵波波速具有较高的线性相关性。基于目前的研究现状,阐述了研究成果在隧道与周边高压充填隐伏溶腔间防突岩层稳定性评价及最小防突厚度确定中的应用。
In order to investigate the influence of saturation on mechanical properties and longitudinal wave velocity of karst limestone,the experiment to on the mechanical property and the elastic wave velocity of karst limestone under natural and saturated condition was conducted. The results are as follows: Saturation has a significant influence on the softening of uniaxial compressive strength,tensile strength and elastic modulus of karst limestone,and peak strain and poisson's ratio of saturated sample are larger than corresponding values of natural specimen on the whole.The longitudinal wave velocity of water-saturated sample is significantly higher than that under natural condition,and the uniaxial compressive strength and tensile strength of specimen under two condition have a significant linear relationship with elastic wave velocity. Based on the current studies,he results are used to assess the stability of rock pillar between tunnel and concealed karst cave with high pressurized water,and calculate the minimum anti-inrush thickness.
湖泊型水源地管理研究——以苏州市太湖水源地为例
陈江,梦月,魏文,
长江流域资源与环境 , 2012,
Abstract: 饮用水安全是最大的民生工程,也是自然资源管理研究的热点。基于实地调研、部门访谈和制度条文的梳理与分析,以苏州市太湖水源地为例研究湖泊型水源地管理体制。研究表明我国水源地管理由国家、省、市、县的法律法规、规章和规范性文件构成相对完善的制度体系,具有水资源和水环境分割管理、流域管理和行政区管理交错的制度特征,初步具备了综合管理的架构;水源保护缺乏流域管治的思维,农村面源污染治理制度支撑不足;在管理手段上以命令控制型手段为主,经济激励与公众参与不足。建立水源地综合管理协调机制,完善经济激励手段,推进公众参与,实施水源地管理共同责任机制将有利于提高水源地管理效率
潜水减压病猪模型的建立及评估
,衣洪杰△,周全,王晔炜,DineshKshemendraAriyadewa,,伟刚
- , 2016, DOI: 10.16781/j.0258-879x.2016.05.0626
Abstract: 目的 建立潜水减压病(DCS)猪模型,用于应用基础研究。方法 选用6头巴马小型猪,采用DWC150型动物实验舱模拟潜水方案处理,以压缩空气加压至600 kPa,停留30 min后,以600~500 kPa 1 min、500~400 kPa 1.5 min、400~300 kPa 2 min、300~200 kPa 2.5 min、200~100 kPa 3 min的方案减压。用动物跑步机评测肢体运动功能,诱发电位仪检测脊髓诱发电位联合确定DCS脊髓损伤;超声评估右心气泡量和心肺功能;观察皮肤症状演变并检测血液指标。通过整体行为学、组织病理学、循环和神经生理学、气泡生成、炎症反应等方面筛选建立评估指标体系。结果 模型DCS发病率100%,死亡率0%。运动功能和诱发电位在减压前后发生明显变化;超声检测出减压后静脉系统气泡量显著,肺动脉指标改变;同时出现典型皮肤损伤;白细胞、血小板数量减少,D-二聚体量增高,肺、脊髓发生淤血、出血等病理改变。上述各类指标能够客观反映模型损伤,可以组成衡量模型发病的评估体系。结论 巴马猪是制备DCS大动物模型的理想动物。
Objective To establish a swine model of diving decompression sickness (DCS) for applied basic research. Methods Six Bama miniature pigs underwent a simulated diving in DWC150 animal chamber with the profile of 600 kPa (30 min) exposure, followed by 600-500 kPa (1 min), 500-400 kPa (1.5 min), 400-300 kPa (2 min), 300-200 kPa (2.5 min) and 200-100 kPa (3 min) decompression. The limb motor function was detected by animal treadmill and the evoked potential of spinal cord was tested jointly to evaluate spinal cord injury of DCS. The amount of bubbles and cardio-pulmonary function were assessed by ultrasonography. The evolution of skin symptoms was observed and blood index was collected. A set of evaluating parameters were screened considering the overall behavior, histopathology, circulation and neurophysiology, bubble generation and inflammation response. Results The DCS incidence was 100% (6/6) in the present research and there was no animal death. Evoked potential and motor function underwent significant change after decompression. Cardiac ultrasonography detected substantial amount of bubbles in the venous system and the pulmonary artery index was changed. Typical skin lesions appeared. White blood cells and platelets were reduced, and the amount of D-dimer was increased. Congestion and bleeding were noticed in the lung and spinal cord. The changes of the above indicators could objectively reflect the DCS injuries, and could be used to set up an evaluation system for swine model of DCS. Conclusion Bama miniature pigs are ideal animals for DCS modelling
生物膜中不同种属微生物的交流与合作
辛秉昌, , 李艳莉, 刘天, 杨德琴
中国科学 生命科学 , 2010,
Abstract: 自然界中的微生物可附着于载体表面形成高度组织化、系统化的微菌落膜性聚合物,即生物膜.与浮游状态的微生物不同,生物膜中不同种属微生物进行着复杂的交流与合作,产生“1+1>2”的非线性相互作用,从而使生物膜在整体上表现出一系列新的生物学特征.生物膜给人们的生活生产带来很多不利的影响,如引起顽固性感染性疾病威胁人类健康、破坏输水管道系统导致工业损失等;但另一方面,生物膜也可发挥积极作用,如降解污染物修复环境,形成生物屏障保护生态等.如何认识生物膜、如何趋利避害使生物膜造福于人类已成为当今世界多领域关注和研究的重要课题.从生物膜的形成、代谢产物与信号分子、水平基因转移及其与外界环境的关系等方面对生物膜中交流与合作的研究进展及意义进行了综述,并提出应从“微生物组学”的高度整体认识生物膜.
一个新的水稻温敏感叶色突变体基因定位分析
祁鲁,刘晓,,林冬枝,董彦君,
核农学报 , 2010,
Abstract: 粳稻品种嘉花1号种子经60Coγ射线辐照后,筛选得到一个温敏感叶色突变体MR20。该突变体的幼苗叶色在较低温度(20℃)下呈黄白色,并随着温度升高叶色由黄白逐渐转绿,其临界温度约为22.5℃,在低温(20℃)和高温(32℃)条件下叶绿素含量也存在显著差异,表明该突变体为低温导致叶绿素合成受阻的温敏感叶色突变体。遗传分析表明该突变体性状受一对隐性核基因控制,暂命名为tsc(t)。以该突变体与籼稻9311杂交的F2群体作为定位群体,利用SSR分子标记将tsc(t)基因初步定位在水稻第3染色体短臂上的分子标记RM231和RM14407之间,其遗传距离分别为1.5cM和0.5cM。随后,进一步扩大F2群体将该tsc(t)基因定位在分子标记MM0541和RM14407之间的约440kb内。
MgO/LDPE纳米复合材料抑制空间电荷及电树枝化特性
赵洪,明忠,,张文,王暄,雷清泉
中国电机工程学报 , 2012,
Abstract: 应用经硅烷偶联处理后的纳米氧化镁(MgO)粉末与低密度聚乙烯(lowdensitypolyethylene,LDPE)共混,制得MgO/LDPE复合介质。高成分衬度扫描电镜(scanningelectronmicroscope,SEM)中图像表明,粒径为100?nm左右的MgO纳米粒子均匀的分散于介质中。通过电声脉冲法(pulsedelectro-acoustic,PEA)测试发现,当纳米MgO填料的质量分数为4%时,可以有效抑制空间电荷的注入,伏安特性的实验结果表明,复合介质拥有更高的空间电荷注入阈值场强。通过电树枝实验,发现复合介质可以抑制电树枝的引发和生长。最后,对实验结果进行了分析,探讨了纳米复合介质抑制空间电荷和树枝化生长的机制。纳米颗粒与基体材料界面电荷行为可能是复合介质电学性能改善的原因。
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