Research and Design of a Routing Protocol in Large-Scale Wireless Sensor Networks

无线传感器网络，作为全球未来十大技术之一，集成了传感器技术、嵌入式计算技术、分布式信息处理和自组织网技术，可实时感知、采集、处理、传输网络分布区域内的各种信息数据，在军事国防、生物医疗、环境监测、抢险救灾、防恐反恐、危险区域远程控制等领域具有十分广阔的应用前景。 本文研究分析了无线传感器网络的已有路由协议，并针对大规模的无线传感器网络设计了一种树状路由协议，它根据节点地址信息来形成路由，从而简化了复杂繁冗的路由表查找和维护，节省了不必要的开销，提高了路由效率，实现了快速有效的数据传输。 为支持此路由协议本文提出了一种自适应动态地址分配算——ADAR（AdaptiveDynamicAddre...As one of the ten high technologies in the future, wireless sensor network, which is the integration of micro-sensors, embedded computing, modern network and Ad Hoc technologies, can apperceive, collect, process and transmit various information data within the region. It can be used in military defense, biomedical, environmental monitoring, disaster relief, counter-terrorism, remote control of haz...学位：工学硕士院系专业：信息科学与技术学院通信工程系_通信与信息系统学号：2332007115216

Spontaneous Ignition of a Single Fuel Droplet in High Temperature and High Pressure Surroundings

報告番号: 甲11808 ; 学位授与年月日: 1996-03-29 ; 学位の種別: 課程博士 ; 学位の種類: 博士(工学) ; 学位記番号: 博工第3606号 ; 研究科・専攻: 工学系研究科航空宇宙工学専

高温高圧雰囲気中における単一燃料液滴の自発点火

University of Tokyo (東京大学

Development of a Small Jet Engine Test System for University Education IGTC2003Tokyo TS-113

ABSTRACT For an effective understanding of the characteristics of gasturbine engines and of jet engines, a project is made to develop a small jet engine test system by university students. A commercial turbo-charger for automotive use is employed and a combustor and nozzles are designed to match it. Auxiliary components such as fuel or lubricant or cooling water supplies are also selected for operation. Diagnosis system to monitor the operating conditions is designed. Most of these components are mass production parts for automobiles that meet the educational requirement of low-cost and heavy-duty. The first firing was achieved in the first year of the project. By improving components performance and matching, the engine achieved the maximum thrust of 42 N at an engine speed of 170,000 rpm and efficiency of 8 % at 160,000 rpm, finally

Reaction, Mechanism and Application of Various Zeolite Syntheses from Coal Fly Ash

The hydrothermal syntheses of zeolites from coal fly ash were carried out using NaOH and KOH as an alkali source in order to clarify the reaction mechanism of zeolitization. The physical properties such as surface structure, crystal structure and cation exchange capacity (CEC), and the ion exchange properties were measured for the zeolites synthesized by hydrothermal treatment. From these results, the effective usage was investigated for various zeolites derived from coal fly ash. Zeolite P, HS (hydroxysodalite) and K-CHA (potassium-chabazite) are mainly formed as zeolite species in NaOH or KOH solution at 393 K. The zeolite P and K-CHA have a large exchange capacity as a cation exchanger. There are three reaction steps; the dissolution, deposition and crystallization reactions in a series of conversion process from coal fly ash to zeolitic materials. The selectivity of cation exchange of various zeolites is explained by the Coulomb's attractive force between the ionic charge of metal ions and the surface charge of zeolites. The obtained zeolites can be used as a cation exchanger and a soil improvement agent. The usage of the synthesized zeolites as soil improvement makes a contribution to return coal residue to soil environmentally friendly