使用IEEE802.1X技术优化校园网计费管理

通过对IEEE 80 2 .1X技术的认证计费系统的分析 ,论述如何用其解决校园网计费管理中现存的问题 ,优化校园网的计费管理     

玉米乳的加工工艺优化设计

对玉米乳饮料的工艺流程和方法进行阐述，采用正交试验、线性回归和分析比较法确定了玉米在７０℃下用０．４％Ｎａ２ＣＯ３溶液及液固比为３１的条件下浸泡３５ｍｉｎ，获得了最佳浸泡效果．确定了其它各单元操作的适宜工艺条件，并对玉米乳中的沉淀问题提出了相应的解决方法．     

窖水中主要无机离子对光催化灭除大肠杆菌(E.coli)的影响研究

采用自主开发的N-TiO_2作为光催化剂,在流动相光催化反应装置中,对窖水中所含Ca~(2+)、Cl~-、CO_3~(2-)、HCO_3~-、SO_4~(2-)等主要无机离子对光催化剂灭除E.coli的影响,以及复配模拟窖水和实际窖水对光催化灭除E.coli的影响进行了实验研究,并分析了其影响机理。实验结果表明:Ca~(2+)、HCO_3~-对光催化灭除E.coli有抑制作用,CO_3~(2-)对光催化灭除E.coli有明显的促进作用,而SO_4~(2-)、Cl~-对光催化灭除E.coli无影响。在对实际窖水进行光催化灭除E.coli菌落总数的实验中,经60min反应,窖水中菌落总数和总大肠菌群均为零,达到国家饮用水卫生标准,说明自主开发的NTiO_2光催化剂在农村窖水深度处理灭除E.coli效果好,可推广应用。     

晶体点缺陷的定向跳跃率和跳离跳跃率

本文区分了晶体点缺陷的定向跳跃率与跳离跳跃率这两个概念,并且由此讨论了点缺陷的运动与复合以及晶体中原子扩散的微观机构,所得理论估算值更接近了实验值。     

Fuel design real-time to control HCCI combustion

In order to achieve lower emissions and extensive load in the homogeneous charge com- pression ignition (HCCI) engine system, a novel fuel design concept that high-octane number fuel and high-cetane number fuel are mixed real-time to con- trol HCCI combustion is proposed in this study. HCCI combustion fueled with iso-octane/n-heptane mix- tures controlled real-time on a single-cylinder HCCI combustion engine is studied. The test results show that the equivalence ratio of n-heptane in mixtures decides ignition and controls the combustion phase of HCCI combustion. The addition of iso-octane ex- tends knocking limit in equivalence ratio somewhat, but knocking occurrence mainly depends on the total concentration of mixture. Although operating range in equivalence ratio becomes narrow with the increas- ing proportion of iso-octane, the maximum load of HCCI combustion fueled with iso-octane/n-heptane mixtures controlled real-time is increased about 80% more than that of pure n-heptane. When iso-octane/ n-heptane mixtures are controlled in optimized method, it is proved that the load of HCCI combustion can be fully extended and emissions can be de- creased remarkably, while at the same time the higher indicated thermal efficiencies are obtained over the extensive operation range.     

赝三元半导体致冷材料的研究

研究出高优值系数的P型和N型赝三元系Bi_2Te_3-Sb_2Te_3-Sb_2Se_3半导体致冷材料,在室温附近最高优值可达到3.2×10~(-3)/K以上。讨论了晶体结构特点和生长条件对材料温差电特性的影响。     

Spatio-temporal characteristics of standardized precipitation index in the Taihu basin during 1951–2000

Spatial and temporal characteristics of standardized precipitation index (SPI), which is widely used for drought/flood monitoring, are investigated in this study. The purpose is to obtain a reasonable primary scheme of zoning on the basis of drought/wetness conditions in the study area. Spatio-temporal distributions of SPI with the time scales of 3 months and 12 months are investigated with the datasets of precipitation in the Taihu basin during past decades (1951–2000). Results indicate that SPI series of 3 months show random fluctuation while that of 12 months behaves like 1/f noise. SPI series of 3 months show little trend while that of 12 months show significant trend at several stations. Drought magnitude (DM) is also estimated on the basis of SPI values to assess drought condition. No trend is detected in DMs with time scales of both 3 months and 12 months. Spatial variability of DM is analyzed by mapping the DM with 12 months for extreme drought and wetness, and regional characteristics are analyzed for DM.     

平面波入射下带电椭球体的内外场强分布

颗粒内部场强决定了粒子散射场强度及其对入射电磁波的吸收作用.借助椭球面的等效球面微元半径及带电球体粒子的Mie散射理论讨论了平面波入射下局部带电椭球体内外场强分布,并与不带电椭球粒子的结果进行了比较.数值结果表明:颗粒表面电荷显著改变了颗粒内外电磁场的分布规律及其强度,从而影响粒子的电磁散射性质.     

(pph_3)_2pt[Sn_2(OH)_xCl_(4-x)](x=1,2,3,4)原子簇化合物的合成与结构研究

本文报导通过Pt(pph_3)_4与SnCl_2·2H_2O反应合成四种新的铂锡簇化物,其化学式为(pph_3)_2pt[Sn_2(0H)_xCl_(4-x)](x=1,2,3,4)利用IR,UV,HNMR等对这些簇化物进行表征,并用VB理论对其结构进行预测,提出两种可能骨架结构: