放射性同位素XRF技术中一种与“特散比”法等效的新方法

在一定的条件下,待测元素特征X射线和康普顿散射强度比值,与待测元素特征X射线强度和带吸收滤片所测量的强度比值之间有着简单的双曲函数关系。利用这一函数关系,很容易在单道携带式放射性同位素X射线荧光分析仪上实现“特散比”法改善基体效应。用这种方法所得到的分析结果和用“特散比”法得到的分析结果,二者吻合很好,而且不需要增加任何设备,节省了测量时间和成本。已经测量了几种类型的锡矿样品和某些铜矿样品。     

超高压汞灯配光曲线的自动测量

为了准确获得超高压汞灯配光曲线数据，通过分析光源尺寸以及光源与探测器距离对测量结
果的影响，利用计算机接口技术和光电转换技术构建一套自动测量装置对超高压汞灯的配光曲线进行自动
测量。利用程序延时以及软件滤波消除超高压汞灯驱动电流、电压、测量装置机械振动对测量结果的影响
，从而提高了测量数据的准确性和稳定性。装置测量所得数据不仅可以满足投影系统仿真对配光曲线精度
的要求，而且可以为超高压汞灯的泡壁和电极设计提供参考。     

交通灯控制系统中黄灯时间的确定

介绍了电灯的由来,探讨了黄灯时间的长短对交通安全正负两方面的影,在应用力学和运动学原理的基础上,提出了一种计算黄灯时间的模型.分析了模型建立的全部过程,最后列出了黄灯时间的求解公式.     

Incident Light Metering in Computer Graphics

Every rendering process consists of two steps. The first is the computing of luminance values by methods like ray tracing or radiosity, and the second step is the mapping of the computed values to values appropriate for displaying. In the last years, as alternative to simple linear scaling which maps the average value to the medium luminance, some new ways of mapping were introduced. These new methods are based on photography analogies and on human vision models. All existing methods follow, implicitly or explicitly, the reflected light metering principle. The method introduced in this paper is the first that follows the incident light metering used in professional photography and in the movie industry. Actually the irradiances are measured using a set of diffusors, which are placed automatically in the scene, and a linear scale factor based on these measurements is used to map the computed radiances to the display device. The diffusors act as half space integrators, they collect the light energy from all half space directions. The light comes from the primary light sources, or it is the result of various interreflections. The newly introduced method reproduces original colors faithfully even for scenes with very low or very high average reflectivity.     

Integrated data analysis on the electron temperature profile of HL-2A with the Bayesian probability inference method

Data analysis on tokamak plasmas is mainly based on various diagnostic systems, which are usually modularized and independent of each other. This leads to a large amount of data not being fully and effectively exploited so that it is not conducive to revealing the deep physical mechanism. In this work, Bayesian probability inference with machine learning methods have been applied to the electron cyclotron emission and Thomson scattering diagnostic systems on HL-2A/2M, and the effects of integrated data analysis (IDA) on the electron temperature of HL-2A with Bayesian probability inference are demonstrated. A program is developed to infer the whole electron temperature profile with a confidence interval, and the program can be applied in online analysis. The IDA results show that the full profile of the electron temperature can be obtained and the diagnostic information is more comprehensive and abundant with IDA. The inference models for electron temperature analysis are established and the developed programs will serve as an experimental data analysis tool for HL-2A/2M in the near future.     

Ultraviolet-visible and surface-enhanced Raman scattering spectroscopy studies on self-assembled films of ruthenium phthalocyanine on organic monolayer-modified silver substrates

A self-assembled film of ruthenium phthalocyanine (RuPc) fabricated on a silver substrate pre-modified with a monolayer of 4-mercaptopyridine (PySH) or 1,4-bis[2-(4-pyridyl)ethenyl]-benzene (BPENB) was studied by ultraviolet-visible (UV-Vis) and surface enhanced Raman scattering (SERS) spectroscopy. PySH or BPENB was used as a ligand to link RuPc since they not only modify the silver substrate, but also deliver a pyridyl group pointing out from the silver surface. Therefore, we can explore the relationship between the structure and orientation of metallophthalocyanine and the substrate modified by the two kinds of organic-monolayers with the different conjugates and molecular lengths. UV-Vis bands due to the organic-monolayer (PySH or BPENB) modified silver films shift to longer wavelengths and a new band arising from the metallophthlocyanine appears, suggesting the binding of RuPc to PySH/BPENB, as well as the interaction between the marcocycle of RuPc and the ring of PySH/BPENB. Vibrational bands arising from both the RuPc and PySH/BPENB moieties appear clearly in the SERS spectra of the RuPc-PySH/BPENB composite films, indicating that RuPc is successfully assembled on the top of PySH/BPENB film. The shifts and relative intensity changes of bands due to PySH or BPENB in the SERS spectra imply the binding of the metallophthalocyanine to the pyridyl group in the composite films. Furthermore, the comparison of the SERS spectra revealed that the orientations of PySH and BPENB in the two kinds of composite films are different; the BPENB moiety in the RuPc-BPENB composite film is more perpendicular to the silver surface compared with the PySH moiety in the RuPc-PySH composite film.     

Selective Coloration of Melanin Nanospheres through Resonant Mie Scattering

Black melanin inks are prepared to selectively exhibit colors under strong light, inspired by human hair. High absorbance of melanin suppresses multiple scattering, causing resonant Mie scattering predominant. Various colors can be developed as the resonant wavelength dictated by nanosphere diameter. Therefore, the melanin inks can be used to encrypt and selectively disclose multicolor patterns for anticounterfeiting applications.     

汽车挡风玻璃刮雨器的控制

本拟设计了一种用于汽车挡风玻璃上的自动雨点检测器及刮雨器控制装置,其原理利用了挡风玻璃中的光波导作用,并经模拟实验证实此方案可行。     

双摄像机光笔式三维坐标测量系统研究

基于双目立体视觉传感器三维测量模型和空间坐标变换原理,采用最小二乘冗余算法,讨论了双摄像机测量空间三维点坐标的基本原理,建立了视觉测量系统的非线性测量方程.通过实验验证了双摄像机光笔式三维坐标视觉测量系统建立的可行性.     

河湖管理范围内渔光互补项目存在的问题与对策

本文通过调研江西省河湖管理范围内渔光互补光伏发电项目开展的实际情况,针对存在的问题,提出相应的对策和建议,为有效开展河湖管理范围内光伏发电项目提供一定的参考依据。