氧化物晶体与薄膜最新研究进展

在工业发展的进程中,氧化物材料在电子学领域中应用最为广泛.到目前为止,即使是对于氧化物晶体材料,从纳米科技角度来说,研究的趋势是降低尺寸直到很小的尺度.近年来,氧化物的研究目标也发生了显著的变化.本文介绍了作者课题组的与氧化物晶体及薄膜有关的三个研究方向.     

基于可供选择的技术的电能计量与控制系统的设计与计算机仿真

设计了一个基于可供选择的技术上的电能计量与控制系统的结构图,推出了一种新型电能表,建立了描述该系统的数学模型,实现了系统的Matlab仿真并对自动抄表系统进行了必要的研究.     

新型高效杀虫剂甲氰菊酯及其制剂的气相色谱分析

甲氰菊酯(Fenpropathrin),商品名为Meotherm,是一种合成的广谱、高效的拟除虫菊酯类杀虫剂。为了配合甲氰菊酯的合成研究及工业开发,我们在国内首次建立了反相高效液相色谱法。本文报告我们建立的适于工业生产检测的气相色谱定量分析方法。     

化学反应的内禀反应坐标法I:甲硫醛脱氢反应的IRC解析

本文用内禀反应坐标法讨论了甲硫醛分子的脱氢反应机理. 在4-31G基组上对此反应做了量子化学从头计算和反应路解析, 得出过渡态结构, 反应势能曲线, 活化能, 反应热以及沿反应坐标反应系的一些物理量的变化, 并对过渡态做了振动分析. 所得结果与甲醛,甲硫醇和甲醇等分子的脱氢反应结果做了对比. 还给出沿反应坐标分子间弹性碰撞阶段和最佳碰撞角等信息. 同时, 计算了反应的频率因子A,讨论了反应速率常数k值与温度的关系.     

Flow and fracture of rocks under general triaxial compression

Recent laboratory studies of the flow and fracture of rocks under general triaxial compression are reviewed. New developments in laboratory techniques have made it possible to measure three principal stresses and strains under general triaxial stress states, in which all three principal stresses are different.Strength and ductility of isotropic rocks are markedly affected not only by the least compression ₃, but also by the intermediate compression ₂, although these two effects are rather additional in strength, but opposite in ductility. The experimental results show that dilatancy is highly anisotropic under the general triaxial stress states.Deformational properties of anisotropic rocks have been also measured under the general triaxial compression. In this case, the effect of the intermediate compression markedly depends on the orientations of the weak planes.     

乙丙共聚物制润滑油粘度指数改进剂的研究

本文报导了一种用于乙丙共聚的高活性负载型催化剂(TiCl₄-FCl₃)/MgC1₂-Al(C₂H₅)₃利用催化剂中PCl₃的配体效应和反应过程中的氢调作用,得到低分子量,窄分子量分布的乙丙共聚物,适宜于用作润滑油的粘度指数改进剂。它在粘度指数、增稠能力、低温粘度、热安定性、氧化安定性以及剪切稳定性等使用性能上具有较好的综合指标。     

两相滴定法研究RE(Ⅲ)-HTTA-TBPO协萃体系

HTTA与中性膦类萃取剂协同萃取稀土元素的报导多数采用分配比法。用两相滴定法研究HTTA-TBPO协同萃取稀土元素,尚未见报导。本文用pH计测出滴定过程平衡水相的pH值,根据文献[1]的计算原理,求出HTTA的两相电离常数K_aE及HTTA-TBPO在有机相中的缔合常数K,并确定有机相中稀土萃合物的组成及其稳定常数。两相滴定法省去了测定两相中稀土离子平衡浓度的繁杂手续,仪器和试剂简单,不仅节约时间,还可得到与分配法同样可靠的结果,是研究协萃体系的一种简便方法。     

运动纠缠双原子与二项式光场相互作用的纠缠特性

本文主要利用量子熵理论,讨论运动纠缠双原子与二项式光场的量子纠缠特性随时间的演化规律,结果表明:光场与原子纠缠度依赖于场模结构参数、光场的调节参量以及光子数.场模结构参数改变,影响纠缠周期性的变化且纠缠度随其增大而降低;当场调节参数处于中间值时,场熵呈明显周期性变化,系统纠缠度最大,退纠缠持续时间最短;光子数的改变不影响场熵演化的周期性,但是会影响周期内振荡频率和纠缠度的最大值.     

Solar energy full-spectrum perfect absorption and efficient photo-thermal generation

Designing and manufacturing cost-effective absorbers that can cover the full-spectrum of solar irradiation is still critically important for solar harvesting. Utilizing control of the lightwave reflection and transmission, metamaterials realize high absorption over a relatively wide bandwidth. Here, a truncated circular cone metasurface (TCCM) composed of alternating multiple layers of titanium (Ti) and silicon dioxide (SiO₂) is presented. Enabled by the synergetic of surface plasmon resonances and Fabry-Pérot resonances, the TCCM simultaneously achieves high absorptivity (exceed 90%), and absorption broadband covers almost the entire solar irradiation spectrum. In addition, the novel absorber exhibits great photo-thermal property. By exploiting the ultrahigh melting point of Ti and SiO₂, high-efficiency solar irradiation absorption and heat release have been achieved at 700℃ when the solar concentration ratio is 500 (i.e., incident light intensity at 5×10⁵ W/m²). It is worth noting that the photo-thermal efficiency is almost unchanged when the incident angle increases from 0° to 45°. The outstanding capacity for solar harvesting and light-to-heat reported in this paper suggests that TCCM has great potential in photothermal therapies, solar desalination, and radiative cooling, etc.