TiO2-x(V2O5)纳米复合薄膜的光吸收

采用溶胶 -凝胶技术 ,以Ti(C4H9O) 4 和V2 O5粉末为原材料制备了纳米结构的TiO2 -x(V2 O5) (x为V2 O5的质量分数 ,分别为 10 % ,2 0 % ,30 % ,10 0 % )复合薄膜 .采用原子力显微镜观察薄膜的表面形貌 ;使用UV VIS NIR分光光度计测量了复合薄膜在紫外 -可见光波段的透射率和反射率光谱 ,研究其光吸收特性 .实验结果表明 :复合薄膜具有纳米颗粒结构 ;随着V2 O5用量的增加 ,复合薄膜在紫外光区的吸收逐渐增加 ,(αhv) 1/ 2 与hv存在线性关系 ,光学带隙由纯TiO2 的 3.36eV减小为x =30 %时的 2 .83eV ,光学带隙与x满足Eg(x) =Eg(0 ) [Eg(1)-Eg(0 ) -b]x bx2 关系式 ;复合薄膜光吸收边缘红移起因于V2 O5复合后薄膜中定域态宽度的增加 .     

热处理对Y2O3:Eu荧光薄膜结晶性能的影响

运用热处理方法对电子束蒸发制备的Y2O3:Eu荧光薄膜进行不同条件下的退火处理.用X射线衍射等手段表征Y2O3:Eu荧光薄膜的成分、结构、表面形貌.实验表明随着温度的升高,薄膜的结晶状况得到改善,提高了薄膜的结晶性能.     

基于InSAR的宁夏黄土丘陵区(西吉县)滑坡隐患早期识别

滑坡灾害突发性强,隐蔽性高,传统的排查手段已无法满足新形势下摸清地质灾害风险隐患底数的要求。随着雷达观测数据精度与质量的发展,合成孔径雷达干涉测量(interferometric synthetic aperture radar, InSAR)成为监测地表变化的有效手段。利用InSAR技术对宁夏黄土丘陵区固原市西吉县进行面状监测,获取了2019年12月25日—2020年1月18日内的形变结果,结合光学遥感影像目视解译对潜在滑坡隐患进行综合遥感识别,共识别出8处隐患点,经实地核查验证,与实际情况吻合。结果表明：InSAR技术在该地区具有很好的适用性,可为当地防灾减灾行动提供数据参考,并为黄土丘陵区滑坡隐患早期识别提供方法借鉴。     

有序分子膜的摩擦学特性研究进展

有序分子膜优良的润滑性能使其在解决摩擦学问题中有潜在的应用价值。文中论述了有关Langmuir Blodgett(LB)膜、自组装 (SA)膜和分子沉积 (MD)膜在实验研究及理论研究方面取得的进展 ,介绍了 3种有序分子膜各自的特点及其摩擦学性能的影响因素。目前对LB膜的研究最广泛 ,对SA膜和MD膜的研究起步较晚 ,并对它们性能的优缺点进行了比较 ,同时对有序分子膜在纳米摩擦学方面的应用前景进行了分析。     

彩色显象管铝膜厚度的数值计算与测试分析

针对彩色显象管的蒸铝，建立了铝膜厚度计算的数学模型，在此基础上，详细地给出了采用点蒸发源和长槽形蒸发源时屏上铝膜厚度的计算方法。用ＦＯＲＴＲＡＮ语言编写了完整的计算程序，针对不同结构尺寸的蒸发源进行了计算，并与实际测试结果进行了比较，最后进行了误差分析。     

电致变色WO3薄膜的结构与光电性能研究

对电致变色ＷＯ３薄膜的结构与光电性能进行了研究．首先从ＷＯ３薄膜的微观结构、电子能态出发，分析了电化学反应导致ＷＯ３薄膜光吸收并着色的机理；其次介绍了ＷＯ３薄膜的制作方法和过程．采用真空电子枪将热压块状ＷＯ３（纯度９９．９％）蒸镀在普通玻璃衬底上，然后用多种物理手段测试了ＷＯ３薄膜的性能与工艺参数的关系，如ＸＲＤ、ＸＰＳ．选择适当的工艺参数可使得膜层的特性达到最佳．最后指出ＷＯ３薄膜最有希望应用在光电子学和太阳能应用领域     

基于大数据挖掘的电力变压器差异预警规则

考虑到模糊边界问题以及变压器个体之间的差异性特征,提出了一种基于大数据挖掘的电力变压器健康状态差异预警规则策略.应用模糊C-均值法辨识变压器的最优特性,通过概率图验证所提方法能最大限度地反映变压器的个性化特征,且所选特特征下的全套溶解数据符合Weibull模型.然后对溶解气体分布特征与缺陷/故障率进行关联分析,计算出相应的报警阈值.将气体浓度和气体增加率与已建立的警告相关联,可以识别变压器的运行状态,在此基础上,提出了基于不同阈值的预警规则,并将其应用于现场运行的变压器.试验结果表明:提出的方法准确率高达98.21％,证明了本文方法具有良好的状态监测性能.     

Influence of growth conditions on the electrochemical synthesis of SnS thin films and their optical properties

Tin sulfide (SnS) thin films were prepared by electrodeposition onto fluorine-doped tin oxide (FTO) glass substrates using an aqueous solution containing SnCl₂ and Na₂S₂O₃ at various deposition potentials (E) and bath concentrations. The pH value and temperature of the solution were kept constant. The deposited films were characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), photoluminescence (PL), and ultraviolet–visible (UV–Vis) spectroscopy. The FESEM images demonstrated that changes in the deposition potential (E) and solution concentration led to marked changes in the morphology of the deposited SnS films. Energy-dispersive X-ray analysis (EDXA) results showed that the Sn/S atomic ratio strongly depended on both the solution concentration and the deposition potential. To obtain an Sn/S atomic ratio approximately equal to 1, the optimal Sn2+/S₂O₃2- molar ratio and E parameter were 1/8 and -1.0 V, respectively. The XRD patterns showed that the synthesized SnS was obviously polycrystalline, with an orthorhombic structure. The effects of the variations of bath concentration and deposition potential on the band-gap energy (E_g) were studied using PL and UV–Vis experiments. The PL spectra of all the SnS films contained two peaks in the visible region and one peak in the infrared (IR) region. The UV–Vis spectra showed that the optical band-gap energy varies from 1.21 to 1.44 eV.     

幼儿的阅读心理及其对图书馆早期阅读服务的启示

早期阅读推广是少儿图书馆的重要工作,如何满足幼儿的阅读需求是图书馆应认真思考的问题。介绍了幼儿心理发展领域的研究成果,探讨了图书馆如何有区别性、有针对地开展早期阅读服务的措施。     

Tribological performance and chemistry of films for di-n-butyl dithiocarbamate derivatives in rapeseed oil

Two di-n-butyl dithiocarbamate derivatives were easily synthesized. Their tribological performances as lubricating oil additives in rapeseed oil were evaluated using a four-ball machine, and their chemistry of films was analyzed with X-ray absorption near-edge spectroscopy (XANES). The results indicate that the two compounds possess excellent anti-wear property and good load-carrying capacity. According to the XANES results, for the thermal films, the outer surfaces are mainly composed of N, S-containing polymer and ferric sulfate, and the near-surface and the bulk are composed of ferrous sulfate, while for the anti-wear films, the outer surfaces are only composed of ferric sulfate, but the near-surface and the bulk are mainly composed of ferrous sulfate.