C语言和PASCAL语言的对比学习     

黄晓因 《思茅师范高等专科学校学报》2003,19(3):27-29

掌握了一门程序设计语言后学习其它的语言课程，应有意识地进行对比。文中重点从数据结构、语言工具两个方面比较了C语言和PASCAL语言的异同并进一步指出：在学习进程中贯穿对比思维，可达到事半功倍、温故知新的效果。  相似文献   

单边极大算子的加权弱型不等式     

刘宗光 《怀化学院学报》1996,(5)

本文讨论了单边极大算子的加权弱型不等式．得到了加权弱型混合Φ—不等式及加权弱型（p，q）不等式成立的充分必要条件。  相似文献   

基于P2P技术的网格资源管理方法     

伍红华  吴桂芳 《阿坝师范高等专科学校学报》2007,24(2):123-125

网格计算的关键技术是资源管理,如何有效地对网格资源进行管理调度是一个网格系统是否可用的关键问题。基于网格资源的特点,文本试图在网格环境中引入对等思想,利用P2P技术来有效地管理动态的网格计算资源。  相似文献   

Hybrid ants-like search algorithms for P2P media streaming distribution in ad hoc networks     

ZUO Dong-hong DU Xu YANG Zong-kai 《浙江大学学报(A卷英文版)》2007,8(8):1191-1198

Media streaming delivery in wireless ad hoc networks is challenging due to the stringent resource restrictions,po-tential high loss rate and the decentralized architecture. To support long and high-quality streams,one viable approach is that a media stream is partitioned into segments,and then the segments are replicated in a network and served in a peer-to-peer(P2P) fashion. However,the searching strategy for segments is one key problem with the approach. This paper proposes a hybrid ants-like search algorithm(HASA) for P2P media streaming distribution in ad hoc networks. It takes the advantages of random walks and ants-like algorithms for searching in unstructured P2P networks,such as low transmitting latency,less jitter times,and low unnecessary traffic. We quantify the performance of our scheme in terms of response time,jitter times,and network messages for media streaming distribution. Simulation results showed that it can effectively improve the search efficiency for P2P media streaming distribution in ad hoc networks.  相似文献   

对P2P技术传播涉及相关法律问题的分析     

林鸿  陈石 《莆田学院学报》2006,13(4):5-8

先简要介绍了一种新兴的互联网技术P2P技术的工作原理和应用,以及其带来的主要法律问题,然后结合全球首宗因P2P应用软件——BT下载侵权行为被法院裁定罪名成立的案例,分析其对现行版权制度的冲击和影响,提出保障其健康发展的法律建议。  相似文献   

完全立方型三次函数为系数的线性微分方程   总被引：4，自引：0，他引：4  

孙长军  李焕茜 《喀什师范学院学报》2004,25(3):9-11

通过把线性微分方程化为可逐次积分的线性微分方程，找出了求这类方程通解的方法与理论，并给出了严格的证明和应用实例。  相似文献   

Should Science be Taught in Early Childhood?     

Haim?EshachEmail author  Michael?N.?Fried 《Journal of Science Education and Technology》2005,14(3):315-336

This essay considers the question of why we should teach science to K-2. After initial consideration of two traditional reasons for studying science, six assertions supporting the idea that even small children should be exposed to science are given. These are, in order: (1) Children naturally enjoy observing and thinking about nature. (2) Exposing students to science develops positive attitudes towards science. (3) Early exposure to scientific phenomena leads to better understanding of the scientific concepts studied later in a formal way. (4) The use of scientifically informed language at an early age influences the eventual development of scientific concepts. (5) Children can understand scientific concepts and reason scientifically. (6) Science is an efficient means for developing scientific thinking. Concrete illustrations of some of the ideas discussed in this essay, particularly, how language and prior knowledge may influence the development of scientific concepts, are then provided. The essay concludes by emphasizing that there is a window of opportunity that educators should exploit by presenting science as part of the curriculum in both kindergarten and the first years of primary school.  相似文献   

虫媒登革病毒的研究——Ⅱ.登革病毒非结构蛋白NS1的纯化、鉴定及其在临床检测应用     

许琳  郭辉玉 《中山大学学报论丛》1995,(2)

本文从纯化Den2 NS1,Mab入手,自制了Mab亲和层析系统,从感染Den2的细胞膜中,分离提取了天然的Den 2 NS1双体,比较其NGC株与我国地方株(H-87)NS1的理化性质及组成,并对某些重要的生物学性质进行了综合性研究。同时,利用上述研究结果建立了检测DF病人血清特异NS1抗体的新方法,探索其协助临床诊断及研究的可能性。  相似文献   

J2EE平台在行政审批服务系统中的应用     

韦鹏程  杨德刚  杨华千 《重庆第二师范学院学报》2006,19(6):46-49

本文分析了电子政务对国民经济所起的重大作用,简要介绍了当前流行的J2EE架构的分布式对象结构特点。设计了一个J2EE架构下的行政审批服务系统,它由客户层、中间层和企业信息系统层等三个层次组成。同时,对系统的设计方法、软件结构及实现技术进行了探讨。  相似文献   

Thermodynamic Analysis and Comparison on Low Temperature CO_2-NH_3 Cascade Refrigeration Cycle     

查世彤  马一太  申江  李敏霞 《天津大学学报(英文版)》2003,9(3)

Intheapplicationsofindustrialandcommercialrefrig erationsystem ,iftherequiredrefrigerationtemperatureisverylow ,theconventionalvaporcompressionsystemisdiffi culttomeettherequirementbecausewhenthedifferencebe tweentheevaporatingtemperatureandthecondensingtemper atureissohighthatitishardtofindarefrigeranttomeettheneedsasthecondensingpressureisnottoohighandtheevap oratingpressureisnottoolow .Whentherefrigeratingtemper atureisverylow ,thecascaderefrigerationcycleissuitabletobeused .Itcannotonlysat…  相似文献