TiO_2-ZrO_2-Bi_2WO_6催化剂的制备及其对苯的降解性能

采用共沉淀法,于600℃焙烧合成了催化剂TiO2-ZrO2(Cat600TZ)和Bi2WO6(Cat600BW);于不同温度(T)焙烧合成了系列具有可见光响应的复合催化剂TiO2-ZrO2-Bi2WO6(CatTTZBW),其结构和性能经UV-Vis,FT-IR,XRD,BET和XPS表征。实验结果表明,随T升高,CatTTZBW的比表面积降低,表面羟基含量减小;于600℃焙烧的Cat600TZBW,Bi2WO6与ZrO2-TiO2相互作用较强,有利于其可见光催化活性提高。以苯为降解模型,分别在紫外光和可见光照射下,考察T对CatTTZBW催化活性的影响。实验结果表明,Cat600TZBW的紫外和可见光活性最高,分别为Cat600TZ的7.5倍,Cat600BW的1.5倍。     

Bright 547-dimensional Hilbert-space entangled resource in 28-pair modes biphoton frequency comb from a reconfigurable silicon microring resonator

High-dimensional entanglement provides valuable resources for quantum technologies,including quantum communication,quantum optical coherence tomography,and quantum computing.Obtaining a high brightness and dimensional entanglement source has significant value.Here we utilize a tunable asymmetric Mach–Zehnder interferometer coupled silicon microring resonator with 100 GHz free spectral range to achieve this goal.With the strategy of the tunable coupler,the dynamical and extensive tuning range of quality factors of the microring can be obtained,and then the biphoton pair generation rate can be optimized.By selecting and characterizing 28 pairs from a more than 30-pair modes biphoton frequency comb,we obtain a Schmidt number of at least 23.4 and on-chip pair generation rate of 19.9 MHz/m W;under a low on-chip pump power,which corresponds to 547 dimensions Hilbert space in frequency freedom.These results will prompt the wide applications of quantum frequency comb and boost the further large density and scalable on-chip quantum information processing.     

导光板底面熔合微棱镜出射亮度规律研究

基于导光板底面直接熔合微棱镜取代目前背光系统平面反射膜和网点两层结构,推导了棱镜底角和出射亮度方向角之间的关系,提出导光板出射亮度方向角与棱镜远近光源底角的解析公式.用LightTools软件对导光板进行建模仿真,通过改变棱镜两个底角,得到出射亮度峰值方向和底角之间的变化规律.理论值与模拟仿真值基本符合,为背光模组一体化的研究提供理论和实验依据.依据上述规律,设计出一体化导光板结构,其中,微棱镜近光源角为86°,远光源角为37°,亮度达到现行3M背光系统指标.     

探究曲线运动的图像描述

从教材和案例两个方面对曲线运动的图像描述进行了探究.     

Heralded path-entangled NOON states generation from a reconfigurable photonic chip

Maximal multi-photon entangled states, known as NOON states, play an essential role in quantum metrology. With the number of photons growing, NOON states are becoming increasingly powerful and advantageous for obtaining supersensitive and super-resolved measurements. In this paper, we propose a universal scheme for generating three- and four-photon path-entangled NOON states on a reconfigurable photonic chip via photons subtracted from pairs and detected by heralding counters. Our method is postselection free, enabling phase supersensitive measurements and sensing at the Heisenberg limit. Our NOON-state generator allows for integration of quantum light sources as well as practical and portable precision phase-related measurements.     

利用手工制作突破电磁学难点的探索与思考

介绍了利用手工制作突破电磁学教学难点的有关探索.     

弹性波在准饱和土和弹性土界面的反射与透射

考虑土颗粒和孔隙流体的压缩性,根据准饱和土体的变形连续条件和平衡条件,推导了P1波(快压缩波)、P2波(慢压缩波)和S波的计算公式．根据Snell定理,研究了平面P1波从准饱和土体入射到弹性土层时在界面上的反射和透射,并绘制了反射系数、透射系数和界面应力、位移随入射角的变化曲线,结果表明:饱和度是影响界面效应的一个重要因素,当饱和度低于99％时,反射和透射系数以及应力和位移基本相等,变化不大,但当饱和度为100％时,虽然饱和度比99％提高了1％,但反射和透射系数以及应力和位移值比饱和度为99％时明显降低．     

迈克耳孙干涉仪用于SFM/SNOM实验

以迈克耳孙干涉仪作为基本操作平台建立了扫描力显微镜/扫描近场光学显微镜(SFM/SNOM)实验系统.该系统可以用于扫描力显微镜和近场光学显微镜的原理性实验,有助于学生深入了解扫描探针显微镜的基本结构和工作原理.     

预硬化明胶酶蚀成像特性的研究

从预硬化重铬酸盐明胶光致抗酶蚀的成像机理出发，分析和推导了酶蚀成像特性曲线，并从实验上考察了几个主要因素对其线性动态范围的影响，其结果对于明胶酶蚀成像技术的应用，特别是对保真沟形微结构光学元件的制作具有指导意义。     

驱动光束不均匀性研究中的硅平面薄膜

 介绍以氧化、扩散、光刻等现代半导体技术结合化学腐蚀工艺实现对Si片的定向自截止腐蚀,制备获得用于研究驱动光束不均匀性的自支撑Si平面薄膜的工艺。通过台阶仪测量厚度在3~4 μm的Si平面薄膜,在扫描范围为1000 μm时,它的表面粗糙度在几十nm;SEM测量表明,Si薄膜表面颗粒度在纳米量级;探讨采用控制扩散、腐蚀参数和表面修饰处理来降低Si膜表面粗糙度的方法。