音乐喷泉控制的计算机监控系统

结合音乐喷泉工程的控制，介绍了计算机监控系统的结构，通信软件中所用的数据格式，ＰＣ机与ＭＣＳ－５１单片机间通信原理及通信软件的设计方法     

音乐喷泉控制的计算机监控系统

结合音乐喷泉工程的控制，介绍了计算机监控系统的结构，通信软件中所用的数据格式，ＰＣ机与ＭＣＳ－５１单片机通信原理及通信软件的设计方法。     

变频器在音乐喷泉中的应用探讨

音乐喷泉系统以声、光、水、色结合的独特效果成为城市景观建设的重要组成部分,目前在各大城市的广场或公园内都采用音乐喷泉来美观设计.该文从介绍音乐喷泉系统的构成入手,探讨了变频调速技术在音乐喷泉控制系统中的应用,并以“古冶幸福广场”喷泉为实例,阐述了变频器在音乐喷泉中应用一些特殊要求.     

基于音乐情感的音乐喷泉CAD系统

本文介绍一种基于音乐情感的音乐喷泉CAD系统。根据乐曲的音乐要素,乐曲情感的可划分成八种音乐情感模式。设计与每种音乐情感模式匹配的喷泉模型,并利用音乐喷泉三维动画仿真显示来反映喷泉设计,能将喷泉水景在计算机屏幕上实时显示并调试到效果满意为止,最后再交由控制系统去实现。这样可以节省大量的人力、物力和财力,体现了先进的音乐喷泉设计技术水平。     

基于单片机的音乐喷泉系统

本文介绍了基于单片机的音乐喷泉系统,本系统是PC机将数据通过RS-232总线传输到单片机,然后应用单片机实现音乐播放、电机转速等功能,实现远距离调控及水、光、电的完美结合,本系统功能强,成本低,具有很高的实用价值。     

基于STC89C52单片机音乐喷泉控制的设计

本文从系统方案、芯片选择、硬件电路搭建原理和软件设计原理等方面介绍了音乐喷泉的设计过程。通过A／D转换芯片对音频信号进行采样和处理,系统分级控制单相电动机,最终达到控制喷头流量的目的。还加以彩灯控制模块,实现音频信号对灯光的控制。实现在播放不同的音乐时,灯光色彩和喷泉水姿随音乐的节奏而变化。最后设计出一个采用单片杌作为以STC89C52单片机为主控制器的小型音乐喷泉控制系统。     

微处理器在喷泉中的应用

本文简要地介绍利用微处理器在一个旧的喷泉控制系统中的应用,完成音乐喷泉、程序式喷泉、保护等功能;水型按设定的程序变化,出现不同的造型,使喷泉的表演与音乐的情感和意境相吻合;系统显示运行状态、音乐信号采集、故障判断、保护、报警功能;简单人机界面设定与RS485远程通讯;8位微处理器MC68HC908SR12。     

设计模式在音乐喷泉控制系统中的应用

本文通过分析一个具体的音乐喷泉实例,介绍一种易于维护的音乐喷泉控制系统。提出了音乐喷泉控制系统的一种软件设计模式。     

基于预测算法的计算机音乐喷泉控制

目的 使用先进的数字预测控制算法,建立以工控机为核心的音乐喷泉计算机控制处理系统,改善传统控制方法的滞后效应。方法 采用预测补偿控制和软件信号延迟方法,作为研究克服系统滞后的途径。结果 预测补偿和延迟控制方案大大提高了音乐与水流配合的同步性。结论 计算机控制系统与预测补偿控制方法提供了一种新的先进的音乐喷泉控制途径。     

基于CAN总线与单片机的音乐喷泉控制系统

介绍了一种基于CAN总线的分布式音乐喷泉控制系统的设计, 各喷泉点采用AT89S52单片机作为控制核心.该系统设计的有效控制范围大约为1 km内,通信位速率约为75 Kbit/s,喷泉点可达数十个.设计了系统硬件构成,建立了CAN多帧控制协议并对帧结构进行了扩展,对软件实现作出了分析.     

Evolution of complex life cycles in helminth parasites

The fundamental question of how complex life cycles--where there is typically more than one host-evolve in host--parasite systems remains largely unexplored. We suggest that complex cycles in helminths without penetrative infective stages evolve by two essentially different processes, depending on where in the cycle a new host is inserted. In 'upward incorporation', a new definitive host, typically higher up a food web and which preys on the original definitive host, is added. Advantages to the parasite are avoidance of mortality due to the predator, greater body size at maturity and higher fecundity. The original host typically becomes an intermediate host, in which reproduction is suppressed. In 'downward incorporation', a new intermediate host is added at a lower trophic level; this reduces mortality and facilitates transmission to the original definitive host. These two processes should also apply in helminths with penetrative infective stages, although the mathematical conditions differ.     

“白岩松风格”透视

随着社会大众对电视节目的艺术审美、价值取向、思想深度等方面的不断追求,电视节目的风格日渐成为决定该节目成败的关键因素之一。优秀的电视节目主持人正是凭借其突出的个性魅力和深厚的知识素养所折射的风格特色吸引着受众的关注。中央电视台新闻评论节目主持人白岩松的＂白岩松风格＂辐射出特有的光彩,其主持艺术、直播艺术、采访风格、评论艺术和生活艺术因为独具特色而备受好评。     

宿主细胞泛素系统与病毒相互作用的研究

真核细胞中,泛素系统执行对大多数短周期寿命蛋白的选择性降解,且已发现由泛素介导的对蛋白的降解调控在细胞的多种生命过程中起重要作用。病毒侵染宿主细胞后,细胞的泛素系统与一些重要的病毒蛋白相互作用,参与调节病毒的生活周期,如病毒迁移,核酸复制,免疫逃避,出芽等过程。     

不同宿主植物对丹参根围土著AM真菌生长发育的影响

利用盆栽实验在灭菌条件下研究了玉米(Zea mays)、葱(Allium fistulosum)、黑麦草(Loliumperenne)和三叶草(Trifolium repens)等4种宿主植物对丹参(Salviamiltiorrhiza)根围土著AM真菌生长和繁殖特性的影响.结果表明,4种供试植物都能与AM真菌形成共生关系,但不同宿主植物形成的菌根特性和程度有明显差异.以三叶草为宿主植物对AM真菌生长最为有利,其根内菌丝SDH活性、孢子数均高于其他3种植物.     

Phylogenetic relationships of host insects of Cordyceps sinensis inferred from mitochondrial Cytochrome b sequences

This study used the sequence of the mitochondrial Cytochrome b(Cytb)to estimate phylogenetic relationships among host Hepialidae insects of Cordyceps sinensis.Genome DNA of host insect was extracted from the dead larva head part of 18 cordyceps populations and 2 species of Hepialus,and the Cytb fragment of host insect was amplified with PCR technique.The nucleotide sequence alignments and their homologous sequences of 24 species host Hepialidae insects of Cordyceps sinensis were obtained from GenBank and were used to construct phylogenetic trees based on neighbor-joining method.The results showed that genus Bipectilus diverged earlier than genus Hepialus and Hepialiscus.Hepialus host insects of Cordyceps sinensis have multitudinous species with different morphological characteristics and geographical distributions.The interspecific genetic differentiations are obvious in Hepialus.Thus,the genus Hepialus might be considered as polyphyletic origin.Cytb sequences have abundant variations among the host insects of Cordyceps sinensis on spe- cific and generic level.The divergence rate of Cytb sequences among the species in Hepialus ranged from 0.23% to 9.24%,except that Hepialus pratensis and Hepialus jinshaensis have the same sequence.Cytb sequence can be used for species identification of host insects of Cordyceps sinensis,but further confirmation in more host insect species is needed.To obtain the Cytb sequence of host insect by ampli- fying DNA extracted from the head part of dead larva in cordyceps turns out to be an effective and accurate approach,which will be useful for studies on phylogeny and genetic structure of host insects of cordyceps populations,especially for analyzing relationships between C. sinensis and its host insects.     

蒙自桤木根瘤的显微结构

蒙自桤木（Alnus nepalensis)根瘤内生菌－Frankia菌感染寄主根部后能形成一个围绕中柱维管束的含菌组织，在受感染的寄主细胞内，Frankia菌的菌丝从寄主细胞中央开始生长，菌丝生长的同时，受感染细胞的体积也随之增大，最后，菌丝顶端膨大，在靠近寄主细胞壁的区域形成泡囊从而成为成熟的固氮根瘤。     

活动主机探测

活动主机探测是一些扫描技术的首要步骤,它的准确性对这些扫描技术有很重要作用.为了提高活动主机探测的准确性,本文分析了当前的活动主机探测技术,在此基础上,给出了一种采用多种活动主机技术,并行探测的方法.然后详细地说明了此方法对应的程序设计和程序实现.     

Phylogenetic relationships of host insects of Cordyceps sinensis inferred from mitochondrial Cytochrome b sequences

This study used the sequence of the mitochondrial Cytochrome b (Cytb) to estimate phylogenetic relationships among host Hepialidae insects of Cordyceps sinensis. Genome DNA of host insect was extracted from the dead larva head part of 18 cordyceps populations and 2 species of Hepialus, and the Cytb fragment of host insect was amplified with PCR technique. The nucleotide sequence alignments and their homologous sequences of 24 species host Hepialidae insects of Cordyceps sinensis were obtained from GenBank and were used to construct phylogenetic trees based on neighbor-joining method. The results showed that genus Bipectilus diverged earlier than genus Hepialus and Hepialiscus. Hepialus host insects of Cordyceps sinensis have multitudinous species with different morphological characteristics and geographical distributions. The interspecific genetic differentiations are obvious in Hepialus. Thus, the genus Hepialus might be considered as polyphyletic origin. Cytb sequences have abundant variations among the host insects of Cordyceps sinensis on specific and generic level. The divergence rate of Cytb sequences among the species in Hepialus ranged from 0.23% to 9.24%, except that Hepialus pratensis and Hepialus jinshaensis have the same sequence. Cytb sequence can be used for species identification of host insects of Cordyceps sinensis, but further confirmation in more host insect species is needed. To obtain the Cytb sequence of host insect by amplifying DNA extracted from the head part of dead larva in cordyceps turns out to be an effective and accurate approach, which will be useful for studies on phylogeny and genetic structure of host insects of cordyceps populations, especially for analyzing relationships between C. sinensis and its host insects.     

Windows虚拟主机的数据库安全与防范

随着计算机网络的普及与发展,虚拟主机的用户越来越多,数据库的安全性也越来越受到人们的广泛重视。分析数据库安全隐患,提出防范措施对提高虚拟主机数据库的安全性有着重要的意义。     

Global landscape of HIV-human protein complexes

Human immunodeficiency virus (HIV) has a small genome and therefore relies heavily on the host cellular machinery to replicate. Identifying which host proteins and complexes come into physical contact with the viral proteins is crucial for a comprehensive understanding of how HIV rewires the host's cellular machinery during the course of infection. Here we report the use of affinity tagging and purification mass spectrometry to determine systematically the physical interactions of all 18 HIV-1 proteins and polyproteins with host proteins in two different human cell lines (HEK293 and Jurkat). Using a quantitative scoring system that we call MiST, we identified with high confidence 497 HIV-human protein-protein interactions involving 435 individual human proteins, with ～40% of the interactions being identified in both cell types. We found that the host proteins hijacked by HIV, especially those found interacting in both cell types, are highly conserved across primates. We uncovered a number of host complexes targeted by viral proteins, including the finding that HIV protease cleaves eIF3d, a subunit of eukaryotic translation initiation factor 3. This host protein is one of eleven identified in this analysis that act to inhibit HIV replication. This data set facilitates a more comprehensive and detailed understanding of how the host machinery is manipulated during the course of HIV infection.