Eu:Y2O3 nano-phosphor prepared by novel energy-saving solution combustion method

A novel energy- and time-saving solution combustion method has been developed to prepare Eu:Y2O3 nano-crystal line phosphor. This novel method employs anhydrous ethanol as solvent and fuel. The prepared nano-crystals after heat-treatment own narrow size distribution, well dispersibility and sinterability, confirmed by XRD, TEM and FTIR. The emission spectra of nano-Eu:Y2O3 Samples show clear nano-size related phenomena. (c) 2007 Elsevier B.V. All rights reserved.

智能玻璃建筑节能特性分析

智能玻璃能够根据人的意愿或者外界环境的变化动态的调节太阳光的输入，是新一代的建筑节能玻璃，目前引起广泛的关注。本文选取了两种典型的智能玻璃——电致变色玻璃和VO2热色玻璃，采用动态能耗分析软件EnergyPlus分别对其建筑节能特性进行了分析，具体研究内容如下： （1）讨论了电致变色玻璃不同控制方式对其节能效果的影响。结果表明，电致变色玻璃选用合适的控制方式可以显著降低建筑的能耗，但如果控制方式选用不当，采用电致变色玻璃后建筑的能耗反而会高于采用普通白玻的能耗。此外，无论在何种控制方式下，采用电致变色/LOW-E的节能效果都要优于电致变色/白玻中空玻璃。 （2）对VO2光学薄膜的膜系结构进行了优化，研究了外观颜色与膜层厚度的关系，设计出的TiO2(135nm)/VO2(50nm)/ITO(45nm)/glass三层膜结构相对于VO2(50nm)/glass的单层膜结构，太阳能调节量提高了从3.7%提高到9.8%，半导体状态时的可见光透过率从33.6%提高到55.5%，金属状态时的可见光透过率从34.0%提高到50.0%，同时半导体与金属状态时的膜面发射率都有很大程度的降低。 （3）研究了VO2热色玻璃的热学性能和建筑节能特性，重点分析了膜层结构、膜面位置、建筑的地理位置等因素对VO2热色玻璃建筑节能效果的影响。结果表明，对于单层VO2热色玻璃，其功能膜面朝向室内比朝向室外可以获得更好的节能效果，而对于由VO2热色玻璃与白玻组成的双层玻璃，其功能膜面位于室内玻璃的外侧时VO2很难起到相应的调节作用。另外，与其他类型的玻璃相比，虽然一定膜层结构下VO2热色玻璃在不同地区的建筑能耗低于白玻，但是在全年以采暖为主的严寒地区和全年以空调为主的夏热冬暖地区，VO2热色玻璃的节能效果分别不及高透型和遮阳型LOW-E玻璃。

A power-saving scheme for IEEE 802.11 Ad hoc networks

In the Wireless Local Area Networks (WLANs), the terminals are often powered by battery, so the power-saving performance of the wireless network card is a very important issue. For IEEE 802.11 Ad hoc networks, a power-saving scheme is presented in Medium Access Control (MAC) layer to reduce the power consumption by allowing the nodes enter into the sleep mode, but the scheme is based on Time-Drive Scheme (TDS) whose power-saving efficiency becomes lower and lower with the network load increasing. This paper presented a novel energy-saving mechanism, called as Hybrid-Drive Scheme (HDS), which introduces into a Message.-Drive Scheme (MDS) and combines MDS with the conventional TDS. The MDS, could obtain high efficiency when the load is heavy; meanwhile the TDS has high efficiency when the network load is small. The analysis shows that the proposed HDS could obtain high energy-efficiency whether the network load is light or heavy and have higher energy-saving efficiency than conventional scheme in the IEEE 802.11 standard.

Experimental investigation on TBAB clathrate hydrate slurry flows in a horizontal tube: Forced convective heat transfer behaviors

Tetra-n-butyl-ammonium bromide (TBAB) clathrate hydrate slurry (CHS) is one kind of secondary refrigerants, which is promising to be applied into air-conditioning or latent-heat transportation systems as a thermal storage or cold carrying medium for energy saving. It is a solid-liquid two phase mixture which is easy to produce and has high latent heat and good fluidity. In this paper, the heat transfer characteristics of TBAB slurry were investigated in a horizontal stainless steel tube under different solid mass fractions and flow velocities with constant heat flux. One velocity region of weakened heat transfer was found. Moreover, TBAB CHS was treated as a kind of Bingham fluids, and the influences of the solid particles, flow velocity and types of flow on the forced convective heat transfer coefficients of TBAB CHS were investigated. At last, criterial correlations of Nusselt number for laminar and turbulent flows in the form of power function were summarized, and the error with experimental results was within 20%.

Combined Effects of Hot Curing Conditions and Reaction Heat on Rubber Vulcanization Efficiency and Vulcanizate Uniformity

A mathematical model of the chemical kinetics of silicone rubber Vulcanization is developed, with the thermal effects being computed using the increment method, and the hot Vulcanization process estimated with the finite element method. The results show that the reaction heat of rubber vulcanization is important for energy saving, and that a proper curing medium temperature is important when considering both vulcanization efficiency and vulcanizate uniformity. The results also indicate that increases in the forced convective heat transfer coefficient have no significant effect above a certain level. The validity of the numerical model is indirectly proven by comparison with existing data.

甲壳单糖、寡糖、低聚糖制备方法的优化与比较研究

该文通过大量实验,确定了制备单糖、寡糖及低聚糖的最佳生产工艺,并对几种制备方法做了比较研究.该文采用氧化降解和微波降解等不同技术对甲壳低聚糖的制备工艺进行了研究.H<,2>O<,2>作为氧化剂,在酸性条件下,采用4因素3水平进行正交实验,得到了制备分子量2000以下的寡糖的最佳条件.微波降解制备低聚糖目前尚未见报道,经过该实验证明此方法可降低能耗,减小污染,节省时间和原料,是一个具有产业化前景和市场潜力的好方法.通过以不同的壳聚糖为原料,探讨了在微波场作用下纯溶剂及盐效应对分子量变化的影响,最终产物的分子量均在1×10<'5>～10×10<'5>之间.根据IR光谱,壳聚糖降解前后主要峰的位置都无变化,只是随壳聚糖相对分子质量的降低各峰峰强有所变化,证明了壳聚糖氧化降解及微波降解制备寡糖、低聚糖是以开裂壳聚糖的β-1.4糖苷键来进行.该项研究对更好的开发利用甲壳质资源,促进中国海洋生物制品的发展具有十分重要的意义.

WIA建筑能耗测量与优化运行系统

在分析建筑高能耗原因的基础上,提出了一个基于WIA的建筑能耗测量与优化运行方案,详细介绍了该方案的结构组成和原理。

基于ZigBee的无线智能灯光墙控器的设计

介绍了一种基于ZigBee协议栈的智能灯光墙控器的工作原理,给出了智能灯光墙控器的结构原理及其应用电路,这种电路利用人体发出的红外线,传感器外加菲涅尔透镜,很容易检测出传感器所覆盖的区域是否有人员存在,来控制灯的开关状态,以达到节能的目的。同时,还可以通过上位机进行远程控制,对同一个网络的各个终端设备进行监控。

异步电机非侵入式效率检测与节能控制

异步电机结构简单、坚固耐用，是主要工业动力设备。异步电机的运行节能问题是工业节能研究的重要内容和热点之一。本文分析了异步电机运行性能，对异步电机的转速和效率检测的非侵入式方法、各种运行方式下的节能控制方法进行了研究，主要贡献有： 对比研究异步电机转速检测的各种方法，采用高分辨率谱估计和混叠采样处理实现了准确的转速检测，给出了转速自动判断方法，为非侵入式效率检测提供了重要的支撑技术。 研究了异步电机的低成本非侵入式效率检测方法，研制了相应的测试装置并进行了相关实验，对检测方法进行精度分析并提出了减小误差的措施。 在非侵入式效率检测的基础上，对于异步电机工频运行、转速开环变频调速和转速闭环转差频率控制变频调速三种运行方式进行了基于效率反馈的节能控制研究。通过专门设计的效率优化模糊控制器实现这三种运行方式下的节能控制，仿真分析表明了所提方法是合理有效的。 针对矢量控制异步电机的效率优化问题，对比分析了模糊搜索和黄金分割法这两种主要效率优化策略的特性，提出了一种混合搜索效率优化方法。这种新方法发挥了前两种寻优策略的互补优势，既保证了收敛的确定性，又降低了对电机输出转矩的影响。仿真分析表明了这种混合搜索方法的可行性。同时，在对输入功率的精确检测条件下，提出了一种全新的效率优化方法，该方法能够在更短时间内实现效率寻优。 探讨了基于无线网络技术的工厂电能管理系统。本文说明了工业无线网络技术的优势，阐述了能够实现系统节能的电能检测与管理技术，如异步电机能效分析模型、异步电机状态监测与预测技术等，分析了基于IEEE802.15.4无线传输协议构建异步电机能效监测系统的可行性。

新型数字液压驱动单元流动状态及补偿液控阀设计研究

根据数字液压驱动单元的运行原理,分析了在空载与加载情况下该数字驱动单元的内部液体流动状态,并以这一流动状态原理为依据,改进设计了传统的液控单向阀。数字液压驱动单元样机及试验结果表明:该数字液压驱动单元与应用传统液控单向阀体的驱动单元相比,具有更加紧凑的体积、更高的响应速度及运行可靠性和显著的节能效果。

A novel method to determine the FOCAL energy range

Determination of the energy range is an important precondition of focus calibration using alignment procedure (FOCAL) test. A new method to determine the energy range of FOCAL off-lined is presented in this paper. Independent of the lithographic tool, the method is time-saving and effective. The influences of some process factors, e.g. resist thickness, post exposure bake (PEB) temperature, PEB time and development time, on the energy range of FOCAL are analyzed.

Fluorene-Based Copolymers Containing Dinaphtho-s-indacene as New Building Blocks for High-Efficiency and Color-Stable Blue LEDs

By incorporating a new building block, 7,7,15,15-tetraoctyldinaphtho-s-indacene (NSI), into the backbone of poly(9,9-dioctylfluorene) (PFO), a novel series of blue light-emitting copolymers (PFO-NSI) have been developed. The insertion of the NSI unit into the PFO backbone leads to the increase of local effective conjugation length, to form low-energy fluorene-NSI-fluorene (FNF) segments that serve as exciton trapping sites, to which the energy transfers from the high-energy PFO segments. This causes these copolymers to show red-shifted emissions compared with PFO, with a high efficiency and good color stability and purity. The best device performance with a luminance efficiency of 3.43 cd . A(-1), a maximum brightness of 6 539 cd . m(-2) and CIE coordinates of (0.152, 0.164) was achieved.