基于磷光Cu(Ⅰ)配合物的可见盲区有机紫外探测器

采用真空沉积法制备了结构为ITO/PEDOT∶PSS(60nm)/m-MTDATA(20～60nm)/Cu(Ⅰ)-complex(20～60nm)/LiF(1nm)/Al(100nm)的有机光伏(OPV)器件,其中m-MTDATA作为电子给体,Cu(phen)((DPEphos))BF4是一种作为电子受体磷光Cu(Ⅰ)配合物.该OPV器件在可见区几乎没有响应仅仅在长波紫外区有响应, 这种可见盲区OPV器件在1.5mW/cm2的365nm紫外光从ITO玻璃方向垂直照射下的开路电压Voc,短路电流Isc和填充因子FF分别为1.95V,107.9μA/cm2和0.283,能量转化效率达到3.97%.还研究了不同紫外光照射强度对器件主要PV性能与照射强度的倚赖关系.     

173 nm真空紫外光源的研制

非相干紫外或真空紫外光源的应用已成为众多工业部门中一项基础性和关键性的技术.本文着重介绍了介质阻挡放电产生173 nm紫外光的原理,并设计制作了利用此方法获得173 nm真空紫外光的装置.试验结果表明,用石英玻璃作介质阻挡层,Xe气体作为放电气体,能够获得峰值波长为175 nm,半高宽为12 nm的窄带大面积真空紫外光,并对其输出光谱进行分析.     

173 nm真空紫外光源的测试及分析

通过自行设计的测量装置,用专用探测器对173 nm介质阻挡放电产生的紫外光进行辐照度的测试.对着火电压与pd值、紫外光源的辐照度之间的关系进行测量分析,并对试验中所用MgF2晶体的透过率进行测量和计算.实验结果表明对于单个的紫外灯,当介质的厚度、气体气压均为常量的时候,介质阻挡放电强度随电压的增加而增加,放电强度呈非线性增加;在气体种类、介质材料的种类和厚度、电极材料的种类确定的情况下,紫外灯的点火电压与pd值会有一个最小值;在大气压下,通过特殊方法测得厚度为2 mm的MgF2晶体对173 nm真空紫外光的透过率为88%.     

纳米沟道真空场发射三极管的制备及其特性研究

基于表面传导电子发射源制备技术制备了一种平面底栅型真空场发射三极管(VFET),器件在真空中实现了良好的栅控特性和场发射特性,并初步获得了在大气环境中的电学性能。采用不同厚度的氧化钯(PdO)作为导电薄膜,通过电形成工艺使导电薄膜龟裂制备真空沟道,研究分析了导电薄膜厚度对真空沟道形成、真空及大气环境下器件电子发射性能的影响。结果表明,PdO薄膜过薄会因其电阻较大而无法聚集足够的焦耳热使薄膜龟裂形成真空沟道,过厚则不能使薄膜完全断裂形成真空沟道;在保证可形成真空沟道的情况下,选择更薄的PdO薄膜有利于降低电形成电压并获得更窄的真空沟道;当PdO厚度为60 nm时,可通过更低的电形成电压获得更窄的真空沟道,使器件拥有更好的电学性能。     

一种新型的紫外光源--准分子紫外灯

非相干性紫外或真空紫外光源的应用已成为众多工业部门中一项基础性和关键性的技术.本文着重介绍一种使用介质阻挡放电激发紫外或真空紫外辐射的新型光源--准分子紫外灯,包括准分子的形成以及光源的紫外辐射效率.最后,对影响准分子辐射的因素如气压、气体组成、温度及电源频率和电压进行了初步的分析.     

电晕放电等级的光学测量

近几年紫外探测技术在电晕放电检测以及局部放电故障诊断方面的作用越来越突出.然而电晕放电过程中的电光特性,以及紫外辐射强度与电晕电流强度之间的量化关系仍然是一个值得深入研究的问题.在不同交流电压和湿度下,通过对电晕电流强度和紫外探测器响应的光脉冲数的测量,发现电晕电流强度和光脉冲教随极间电压的升高而显著升高,并且随着相对...     

新型铝基共面微腔等离子体阵列在氖气中放电的光特性研究

在厚度为100μm的铝基底上,制作了一种由隙缝相连的六边形共面微腔阵列,研究了方波驱动下,该微腔阵列在氖气中的放电发光分布与气压的关系,光谱分布及放电的演变过程。结果表明:这种隙缝相连的六边形共面微腔阵列放电时,随气压的升高,发光光强分布从腔体中心位置逐步向腔体侧壁移动,其发光光谱为588 nm的可见光和312 nm的紫外光。增强电荷耦合器件拍摄的阵列放电瞬时状态表明,在一个方波驱动周期的两次放电中,共面微腔等离子体阵列放电演变呈现出等离子波动传播的现象,且这两次传播方向相反,传播速度均为10~15 km/s。     

一种新型的紫外光源—准分子紫外灯

非相干性紫外或真空紫外光源的应用已成为众多工业部门中一项基础性和关键性的技术,本着重介绍一种使用介质阻挡放民激发紫外或真空紫外辐射的新型光源－－准分子此外灯,包括准分子的形成以及光源的紫外辐射效率,最后,对影响准分子辐射的因素如气压,气体组成,温度及电源频率和电压进行了初步的分析。     

纳米TiO2薄膜微阵列电极的制备与紫外光电阻特性表征

采用溶胶凝胶法在叉指型微阵列电极表面制备了TiO2纳米薄膜，并对薄膜形貌、厚度以及溶胶粒子尺寸进行了表征，研究了温度、紫外光照对纳米TiO2薄膜微阵列电极的电阻的影响。结果表明，溶胶粒子平均粒径在9nm，单次提拉制备的TiO2纳米薄膜膜厚为120nm，两次提拉薄膜厚度200nm，纳米TiO2薄膜微阵列电极电阻呈现半导体特性，大气环境中，紫外光照下纳米薄膜微电极的低温电阻较无光照时明显减小，表现出紫外光敏感特性。随着温度的升高，紫外光照下的电阻与无光照时电阻差值逐步减小，表明温度对纳米薄膜电阻有更大的影响。     

CsI/Ni/LiF半透明真空紫外光阴极“日盲”效应的验证

CSI／Ni／LiF半透明真空紫外光阴极，由于CSI的长波阈值为200nm，即有很好的“日盲”效应。通过对照测试，得到验证。用氢真空紫外辐射源作检测光源，在专用的真空紫外光电发射特性测试系统中，测得CSI／Ni／LiF半透明真空紫外光阴极在105～165nm波长范围内平均量子产额为0．16～0．21电子／入射光子，而在200～365nm紫外辐射下，其量子产额仅为10－6～10－5电子／入射光子。可见对200nm以上波长的紫外光不灵敏，即具有良好的“日盲”效应。     

Estimation of Parameters of Universal Distribution of Moments of Failure of Products

A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling.     

Assessment of intakes of mixtures of radionuclides

Australia has several uranium mines and a large number of mineral sand mines, with associated processing facilities. Exposures resulting from these mining and processing operations usually involve intakes of mixtures of radionuclides. This work describes the development of a suite of first order, linear compartment models, based on the ICRP Publication 66 respiratory tract model, and an analytical solution to the decay equations, for assessing the consequences of such intakes. The computer programs based on these models directly compute excretion, organ retention and organ and whole-body doses for intakes of either single radionuclides or any mixture of radionuclides belonging to the same radioactive decay chain. The intake can be via inhalation, ingestion or injection, and can be acute, chronic or of limited duration. The starting concentration and degree of secular (dis)equilibrium can be specified for each radionuclide. No assumptions need to be made about the relative magnitudes of the radioactive half-lives of the different nuclides.     

卧式金属罐容量的测量结果不确定度

本文根据多年的实践检定经验 ,参照JJF1 0 59- 1 999《测量不确定度评定与表示》以及《测量不确定度表达 1 0讲》 ,对卧式金属罐容量的测量结果不确定度进行了评定。     

盐酸浓度不确定度的评估

通过对盐酸浓度标定的过程分析，找出影响结果的各个分量，进行不确定度的评定，按照计量技术规范给出标准的表示法。     

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue.     

Analysis of anisotropy of properties on the basis of studies of texture of coarse-grained ingots of thermoelectric materials

An analysis of anisotropy of the properties of a Bi₂Se_0.3Te_2.7 solid solution was carried out using construction of demonstrative surfaces for thermoelectric effectiveness and thermal expansion coefficients. It is shown that the texture is an important factor forming anisotropy of properties and technological fitness of ingots for manufacturing modules. Anisotropy of properties based on the studies of the ingot textures obtained using the float-zone method and Bridgman method (growing thermoelectric plates in a flat cavity) was studied.