自来水中的TOC、UV254和浊度的相关性研究

通过应用回归分析方法,对西安市某水厂的出水、管网中间水和管网末梢水的TOC、UV254和浊度的监测数据进行了相关性分析。结果表明：随着供水管网的延长,浊度和UV254的线性相关系数明显增加;随着供水管网的延长,浊度和TOC的线性相关系数明显降低。     

氧化物玻璃中 Eu￣(3+) 离子的敏化发光与能量传递

研究了氧化物玻璃中Ｅｕ３＋离子的敏化发光。结果表明,硅酸盐玻璃中Ｂｉ３＋向Ｅｕ３＋离子产生共振能量转移而对Ｅｕ３＋发光起敏化作用;磷酸盐玻璃中,Ｐｒ３＋,Ｓｍ３＋对Ｅｕ３＋离子产生特征激发敏化发光,提出了声子支助的共振能量转移模型,解释了Ｅｕ３＋的敏化发光。     

强激波背后发光形态观测及其结果的图像处理

本研究是用实验观测的方法判明低密度空气中发生的强激波的构造并进而分析其特性。为此,首先利用自由活塞二段隔膜激波管获得强激波,并以新型高速照相机拍摄激波背后的发光域,然后以SPICCA图像处理机对拍摄的照片进行等辉度线和浓度变换等处理。研究结果表明:(1)激波背后的发光受其速度影响很大,当激波速度U_s超过11.0km/s时,发光强度将出现两次峰值;(2)空气中氧元素对激波背后的发光情况有重要影响;(3)初压不同时,发光形态不同,当初压增高时,发光时间和强度都增加。这些结论为从理论上分析与研究强激波背后发光的形态与特性提供了可贵的参考资料。     

Plant mineral nutrition,gas exchange and photosynthesis in space: A review

Successful growth and development of higher plants in space rely on adequate availability and uptake of water and nutrients, and efficient energy distribution through photosynthesis and gas exchange. In the present review, literature has been reviewed to assemble the relevant knowledge within space plant research for future planetary missions. Focus has been on fractional gravity, space radiation, magnetic fields and ultimately a combined effect of these factors on gas exchange, photosynthesis and transport of water and solutes.     

天基导弹紫外预警及紫外预警探测仪

文章简单介绍了国外导弹紫外预警的研究现状,分析了紫外预警的关键要素。     

飞机复合材料修理中固化技术的探讨

对飞机复合材料固化工艺中热固化、微波固化、电子束固化、紫外光固化等技术的机理和研究现状进行了分析对比。     

Method of the HF wave absorption evaluation based on GIRO network data

High frequency (HF) communication is strongly dependent on the state of the ionosphere, which specifies the mode structure of the radio wave propagating in ionosphere. Another core factor defining the strength of the HF signal at the receiving site is the ionospheric absorption. Accurate modelling the effect of absorption is an essential part of many studies of the HF propagation in the ionosphere.This paper proposes a method for estimating the absorption. The method is based on analysis of vertical sounding ionograms. The main idea of the approach is to compare the main parameters retrieved from measured and simulated ionograms. The combination of Global Ionospheric Radio Observatory (GIRO, http://giro.uml.edu) data and ionograms modelling allows for developing the empiric absorption model available at near real-time. The ionogram simulation taking into account absorption utilizes the NIM-RT (North Ionospheric Model and Ray Tracing) software. As a result, the proposed technique provides more reliable and accurate evaluation of minimum frequency at which echoes are observed in vertical incidence ionosonde soundings. The values of these frequencies should be used in the following simulation to optimize parameters in the empirical formulae for defining absorption HF wave in ionosphere.The ultimate objective of this work is the designing the method, which allows the simulating of HF radio channel accounting for regular absorption due to UV radiation of the Sun. Eventually it could be considered as some kind of the HF propagation forecasting.     

掺Ce^3＋的碱土氟化物的紫外发光特性研究

研究了掺杂稀土离子Ce^3＋的碱土氟化物发光体LiXAlF6：Ce^3＋（X=Ca^2＋,Sr^2＋或Ba^2＋）,XBaAlF6：Ce^3＋（X=Li6＋,Na^＋或K^＋）及LiBaXF6：Ce^3＋（X=Al^3＋,Ga^3＋或In^3＋）的紫外发光特性。实验发现,在LiXAlF6=Ce^3＋中,随着X元素原子序数的增大,Ce^3＋的发光峰就向短波方向移动。首次研究了在XBaAlF6：Ce^3＋与LiBaXF6：Ce^3＋中的X元素的一价与三价离子对Ce^3＋发光的影响,发现这些一价与三价离子的原子序数的变化并不影响Ce^3＋的发射光谱的峰值,它们只在晶格中起着填隙和电荷补偿作用,这有利于Ce^3＋的发光,使发光强度有所增强。这些紫外发光可用来增强X射线影像板中所包含的储存辐射的发光体BaFBr：Eu“的发光,使X射线影像板的显像增强。     

高精度紫外探测器定标测试方法

文章研究分析了紫外电学定标探测器的主要光电不等效因素,并建立了基于紫外电学定标探测器的紫外辐射定标系统。在此基础上,利用紫外探测器定标测试平台,开展了紫外探测器的测试方法研究,响应率定标的总不确定度为3%～5%,相对光谱测试的总不确定度为3%。     

TiO2光催化薄膜在空间污染防护 应用中的探索

文章采用溶胶凝胶法在JGS1石英玻璃上制备了TiO₂薄膜,并对其晶体结构与光催化性能之间的关系进行了研究,探讨了紫外光辐照下TiO₂薄膜对大分子链硅油光催化效果。结果表明:经500 ℃热处理后的TiO₂薄膜为锐钛矿结构,具有较高的光催化活性;在253 nm紫外光辐照下,TiO₂薄膜对大分子链硅油表现出较好的光催化降解效果。该研究将为空间环境下飞行器光学表面污染净化材料的开发提供有益参考。