纳米SnO_2薄膜的制备、结构和性能研究

在真空度为 1 3 3 .3μPa时 ,用真空气相沉积方法在玻璃衬底上沉积 Sn O2 薄膜 .通过XRD、SEM等测试分析 ,研究了杂质掺杂及热处理前后的 Sn O2 薄膜的结构、晶粒尺寸、电学特性以及不同工艺条件对薄膜性能的影响 .结果表明 ,掺 Bi有效地抑制了晶粒生长 ,提高了薄膜的稳定性 .掺 Bi后 ,薄膜的电学特性增强 ,而掺 In、Cd则影响不大 .     

吸收型光学双稳态方程的尖点突变

利用为理论的方法对吸收光学双稳态的状态方程进行分岔分析,经过推导得到尖点突变的形式,并导出了尖点突变的分岔集。     

[Co(2，3tri)(pz)Cl]2+体系配合物水解-重排机理研空

本文提出了一个「Ｃｏ（三元胺）（二元胺）Ｃｌ」＾２＋型的配合物及其异构体的重排机理模型,它包含了所有异构体间的转换关系,这一模型表面式异构体在重排过程中的重要性,利用对映异构体旋光性质及其可能的变化提出了可能存在一与经典模式不同的中间体假设。     

薄板坯连铸结晶器内流场的三维数值模拟

针对薄板坯连铸结晶器中钢液的紊流流动特征,利用商业软件ＣＦＸ４．２建立了一个三维有限差分模型,计算这一限定空间射流的紊流时均场,采用均相流模型,模拟了结晶器内钢液液面形状及速度场,通过计算,分析了浸入式水口形状、拉速等工艺参数对薄板坯连铸结晶器流场的影响,同时,研究了结晶器出口处速度分布对结晶器内钢液流动的影响。     

CVD金刚石薄膜的织构分析

采用极图和取向分布函数法分析ＣＶＤ金刚石江膜的不同织构,分析表明,高的多重性因子使得｛１１０｝面织构有更高的出现概率,具体分析了｛２２１｝面织构出现的孪生机制,强调了织构与性能关系研究的重要性,并推荐使用先进织构分析手段。     

薄板坯连铸液芯铸轧过程铸坯的应力应变分析

采用三维弹塑性大变形热力耦合有限元法,模拟薄板坯连铸液芯铸轧过程中的铸坯变形,并研究液芯铸轧时坯亮中应力应变场。分析影响坯壳中应力应变场的主要因素的基础上,给出压下率和坯壳厚度对应力应变场的影响规律。     

光学系统热效应及分析软件研制

研究温度对光学系统的影响,讨论无热设计方法。采用温度热膨胀系统和光线追迹分析温度变化对光学系统结构参数的影响及成像质量的变化。研究表明,温度对光学系统的影响是明显的,无热设计是可行的。温度的热效率不可忽视,利用热效应分析光学设计软件可对光学系统的热效应进行有效分析。     

Characteristics of atmospheric aerosol optical depth variation over China in recent 30 years

This note retrieves the annual and monthly mean 0.75 μm aerosol optical depth (AOD) by using the daily direct solar radiation and sunshine duration data of 47 solar stations from 1961 to 1990. The characteristic of AOD variation over China in recent 30 years was analyzed. The results indicate that AOD increased obviously over China from 1961 to 1990. AOD increased most rapidly over the east part of Southwest China, the middle-and-lower reaches of the Yangtze River and the Tibetan Plateau. The increasing trend of AOD is also relatively distinct in North China, the Shandong Peninsula, east part of Qinghai Province, and coastal areas of Guangdong Province. However, in most parts of Northwest China and Northeast China, the increase of AOD is less significant, while in the west part of the Xinjiang Uygur Autonomous Region and some parts of Yunnan Province, AOD shows decreasing tendency. Generally, AOD reaches its maximum in spring and the minimum appears in summer. As to the linear trend, the maximum occurs in spring but the minimum in winter. Among the 47 stations selected in this note, the largest three stations of AOD are Chengdu, Chongqing and Nanchong, respectively, which all lie in the Sichuan Basin, and the smallest value of AOD occurs in Jinghong located in Yunnan Province.     

Synthesis of N-acetamide C60 nitride and its performance of optical limiting

N-acetamide C₆₀ nitride (N-acetamide-1,2-dihydro-1,2-aza-fullerene [60]) has been synthesized by the reaction of C₆₀ and azidoacetamide and initially characterized. Its mechanism was that the objective product is formed through intermediate triazoline. The computational study shows that N-nitride structure is thermodynamically more stable by using the semi-empirical AM1 SCF-MO method. The properties of optical limiting were tested by using double frequency Nd: YAG pulse laser system and showed that the optical limiting mechanism is reverse saturation absorption. At wavelength of 532 nm, compared with optical limiting for ns pulse, this new material has good optical limiting character for ps pulse. At wavelength of 707 nm, the capacity of optical limiting of the derivative is prior to C₆₀.     

Hydrothermal synthesis,characterization and nonlinear optical effect of orthorhombic phase Ca2B6O11·H2O

Hydrothermal treatment of calcium oxide and boric acid mixtures at temperatures between 234℃ and 300℃ has produced a colorless,transparent,orthorhombic compound Ca2B6O11.H2O.Of the seven known members of the series of hydrated dicalcium hexaborate containing boron-oxygen six-membered ring anionic group (B3O8)7-,only the title compound has been found to have the nonlinear optical effect.The second harmanic generation (SHG) effect of its crystal is larger than that of KH2PO4 (KDP).The reflection spectrum has shown that this compound has no absorption in the experimental wavelength range (800-240 nm).Its crystal structure is favorable for generating the nonlinear optical effect.