Excited-state absorption of meso-tetrasulfonatophenyl porphyrin: Effects of pH and micelles

The influence of the environment on the excited state transitions of meso-tetrakis(p-sulfonatophenyl) porphyrin (TPPS) is reported. TPPS was investigated in protonated and non-protonated forms, and in the presence of the cationic cetyltrimethylammonium bromide (CTAB) micelles. The singlet excited-state absorption spectra were measured by using the white-light continuum Z-scan technique and the triplet–triplet absorption spectra were acquired employing an association of laser flash photolysis and Z-scan techniques. Our results show that the perseveration of the molecular symmetry, upon excitation, depends on the state of multiplicity of the molecules, as well as on the environment and structural characteristics of the porphyrin. Additionally, it was observed that for excited molecules, the ring distortion caused by the protonation of porphyrin ring has great influence on the changes observed for the symmetry and vibronic structure. The results clearly show that the porphyrin investigated is a promising candidate for optical limiting applications for all investigated environments.     

圆形超细金属／合金丝研究进展及其在Z箍缩研究中的应用

介绍了圆形超细金属／合金丝制备技术基本原理、技术特点及基本性能，主要包括拉拔技术、电解腐蚀技术及熔融快速凝固技术。回顾了超细W、Mo、Al丝等在Z箍缩丝阵负载材料中的应用。     

一种快速的固体核径迹图像分割方法

针对有效测量中需解决的问题,提出了一种快速的固体核径迹图像分割算法,分初始分割与粘连分离两个过程。初始分割通过数学形态学开操作快速去除背景后,迭代阈值分割法实现;粘连分离采用复合距离变换计算核心膨胀半径,一次膨胀重建单个径迹轮廓。实验结果表明,算法具有较强的抗噪能力,可有效对半径≥2μm径迹进行快速分割,准确率>90%。目前已成功运用于实际项目中。     

Electrochemical insertion of lithium into a doped diamond film grown on carbon felt substrates

This paper summarizes the preliminary results obtained from lithium electrochemical intercalation into boron-doped diamond films grown on carbon felt (BDD/CF electrode). BDD films have been grown by Hot Filaments Chemical Vapor Deposition (HFCVD) and have been characterized by Scanning Electron Microscopy (SEM) and Raman Scattering spectroscopy. BDD/CF composite electrodes, which contain a diamond layer, lead to higher conductivity and smaller grain sizes. In turn, they are richer in boundary or sp² sites, and present a reversible specific capacity that is much larger than that of the substrate alone, indicating that the diamond layer effectively participates in lithium storage. Diamond layers displaying boron doping levels of 10¹⁹ and 10²¹ part cm^− 3 provide a specific capacity of 160 and 370 mA h g^− 1, respectively, which is associated with lithium storage.     

小型化快响应软X射线探测器研究

研制了用于探测脉宽为亚纳秒级软X射线脉冲的小型化X射线探测器,对该类结构的X射线探测器的响应时间参数进行了理论分析与计算。根据理论分析与计算结果,采用基于有限元法的电磁场仿真软件HFSS10.0对该探测器的探测二极管进行了电磁场建模与仿真,并根据传输线理论对传输超宽带信号的同轴输出通路进行了优化设计,采用超薄高介电强度薄膜构成大存储电容的新方式,解决了设计该类高速探测器中存在的大存储电容与耐高压的技术难题。在“神光Ⅲ原型激光装置”上对该探测器进行了实验考核。实验结果表明,探测器的响应时间可达51 ps。此外,还对设计该类高速响应探测器时某些物理学方面的考虑进行了讨论。     

Growth and characterization of indium doped zinc oxide films sputtered from powder targets

Indium doped Zn O films were grown on quartz glass substrates by radio frequency magnetron sputtering from powder targets. Indium content in the targets varied from 1at% to 9at%. In doping on the structure, optical and electrical properties of Zn O thin films were studied. X-ray diffraction shows that all the films are hexagonal wurtzite with c-axis perpendicular to the substrates. There is a positive strain in the films and it increases with indium content. All the films show a high transmittance of 86% in the visible light region. Undoped Zn O thin film exhibits a high transmittance in the near infrared region. The transmittance of indium doped Zn O thin films decreases sharply in the near infrared region, and a cut-off wavelength can be found. The lowest resistivity of 4.3×10~(-4) Ω·cm and the highest carrier concentration of 1.86×10~(21) cm~(-3) can be obtained from Zn O thin films with an indium content of 5at% in the target.     

熔石英元件抛光加工表面残余应力的计算方法

为解决传统检测方法无法直接定量检测非晶体熔石英玻璃表面残余应力的问题,基于脆性固体断裂力学理论,推导残余应力的理论计算公式,提出光学元件抛光加工表面残余应力计算新方法.采用尖锐压头进行纳米印压实验,提取压痕过程中对残余应力敏感的参数,并对实验数据进行线性拟合,确定拟合线的斜率,通过测量残余应力引起其他物理参数的变化计算残余应力.对比分析结果表明,计算得到残余应力值与应力双折射仪检测得到的数据基本吻合,验证了提出残余应力计算方法的正确性.     

基于PowerBuilder DataWindow的项目进度管理的设计与实现

介绍在PowerBuilder 10环境下,利用数据窗口对象(DataWindow)实现项目进度管理的设计思路和实现方法。传统的进度管理界面多以数据列表为载体,用数字展示项目的进展情况,本文设计的进度管理功能界面以甘特图为设计思路,将数据转化为条形图,直观地表现了项目的进展情况。