A New Implementation of the Post-Stage Tasks of Motion Estimation Using SIMD Architecture

IntroductionThe MPEG2 [1] video compression standard is oneof the key technologies for applications such asdigital broadcasting,storage media,etc.Recently,some single chip video encoders havebeen developed for the MPEG2 standard. Thedevelopment of hardware architecture suitable forsystem integration is the key to single chipimplementation.Motion estimation/compensation is the keypart of a single MPEG2 video encoder chip. It hasa great impact on the chip size,the powerdissipation,and the …     

Efficient and Low-Latency Systolic Array Architecture for Full Searches in Block-Matching Motion Estimation

IntroductionEmerging applications such as interactive videocommunication,digital broadcasting,and digitalstorage media require video compression.Thecomputational complexity requires hardware forreal time processing.A central component of video compression isthe motion estimation unit,which exploits thetemporal redundancy of a video sequence.Block-matching,the most popular motion estimationmethod,searches for a motion vector thatminimizes the distortion error between amacroblock of a frame to b…     

活性炭负载纳米零价铁去除溴酸盐的研究

实验采用液相还原法制备活性炭负载纳米零价铁材料(nZVI/AC),并利用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)等对其结构进行表征.考察了不同反应条件下nZVI/AC对BrO3-的去除效率,并研究其去除机理.结果表明nZVI/AC具有很高的表面反应活性,且nZVI和活性炭(AC)之间存在协同作用. BrO3-的去除效率随 pH 值的减小而增大, 共存离子NO3-和SO42-对其去除率影响不大但降低了去除速率.机理分析表明BrO3-被nZVI/AC吸附而使局部BrO3-浓度升高,并被nZVI迅速还原为无毒的Br-.     

盐酸戊乙奎醚对大鼠心肌微血管内皮细胞缺氧/复氧后的保护作用

目的：从细胞水平建立大鼠心肌微血管内皮细胞缺氧/复氧模型，观察了盐酸戊乙奎醚对心肌微血管内皮细胞的H/R损伤的保护作用。方法：实验采用酶消化法进行细胞的原代培养，1：2传代。采用荧光标记乙酰化Dil-Ac-LDL的方法鉴定。培养的细胞随机分为4组，①对照组，常氧环境下培养，不给予任何处理；②H/R组，改培养液为D-Hank,s液，于37℃、5%CO2、95%N2 密闭缺氧鑵内培养2h后，弃D-Hank,s液，改为完全培养液，放入常氧培养箱中继续培养4h;③PHC预处理组，在细胞缺氧2h前给予PHC（终浓度为0.1μm•L-1）预处理，④H/R +PHC组，在细胞H/R后，给予PHC（终浓度为0.1μm•L-1）孵育2h。MTT自动比色法测细胞活力，流式细胞法检测细胞凋亡。结果：①成功培养大鼠心肌微血管内皮细胞，用荧光标记乙酰化Dil-Ac-LDL的方法鉴定为微血管内皮细胞。②成功制备出微血管内皮细胞的H/R模型 将试验细胞培养液改为D-Hank,s 液，置于37℃、5%CO2、92%N2 密闭缺氧罐中环缺氧2h，后改为完全培养液放入常氧培养箱中继续培养4h可制备出微血管内皮细胞的I/R模型。③. H/R组细胞死亡率和凋亡率与对照组相比明显增高，差异有统计学意义（P<0.01），PHC+H/R组的细胞死亡率和凋亡率下降，差异有统计学意义（P<0.05）,H/R+PHC组与对照组相比，虽然细胞的死亡率和凋亡率有所下降，但差异没有统计学意义（P>0.05）。结论：PHC预处理对大鼠微血管内皮细胞的H/RI有保护作用。 关键词：盐酸戊乙奎醚；心肌微血管内皮细胞；缺氧/复氧     

Universal Distributed Estimation Scheme for a Bandwidth Constrained Ad Hoc Sensor Network

This paper describes a distributed estimation scheme (DES) for a bandwidth constrained ad hoc sensor network.The DES is universal in the sense that operations on all sensors are identical and independent of noise distribution.The scheme requires each sensor to transmit just a 1-bit message per observation.Simulation results show that the scheme achieves much better mean-squares error (MSE) performance than the simplified isotropic universal DES and even outperforms the isotropic universal DES which requires more than twice the bandwidth of this scheme.     

尿液中氯胺酮的固液提取方法比较

研究了液-液提取法和固相提取法对尿液中氯胺酮提取的差异,并明确了两种提取方法的适用条件.结果表明,两种提取方法均能有效地将氯胺酮从尿液中提取,但液-液提取法操作简单,省时高效,适合于筛选检验;而固相提取法污染少,操作人员与试剂接触少,但操作时间相对较长,适用于氯胺酮的定量分析.     

应用〔G＇/G＋G＇〕展开法求EqualWidth方程的精确解

应用〔G＇/G＋G＇〕展开法,求出了EqualWidth方程的精确解,并对解的性质进行了相应的分析.     

应用程序存储设计研究与实现

文章在对影响磁盘性能的关键因素进行分析的基础上,重点研究了基本输入输出对应用程序存储容量设计的影响,给出了应用程序存储容量设计的基本方法.     

基于 PRO/E 的风力发电机叶片复杂曲面建模

以涡流理论为基础,基于点坐标的空间几何变换理论,按照风力发电机叶片设计的实际过程,对风力发电机叶片的空间截面坐标进行求解,提出了一种通用设计方法,并运用 PRO/E 软件,实现了风力发电机叶片三维实体的精确建模.该方法对于风机的优化建模具有指导意义.     

XXXIX.—The Hippoboscidæ (Diptera) recorded from Ceylon

Summary

The most profitable ways of collecting chalcids are discussed, namely by sweeping, suction sampler, beating, pyrethrum spray, rearing, Malaise traps, yellow pan traps, suction traps, pitfall traps and extraction from leaf litter or grass tussocks. Methods of preserving chalcids are also outlined, with particular emphasis on storing all unmounted material dry rather than in alcohol. The techniques of sweeping, card mounting specimens and slide preparation are described in detail.