Study of the optical properties of a reflecting coating prepared from a Kapton film with deposited aluminum

The effect of the flux density, the flux, and the energy of electrons on the change in reflection spectra and the total solar radiation absorption by the reflecting coating of a space vehicle fabricated from a Kapton film with deposited aluminum in the People's Republic of China is investigated. Tomsk Polytechnic University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 29–34, July, 2000.     

Influence of the Flux Density,the Flux,and the Energy of Electrons on the Change in the Optical Properties of ZnO + K2SiO3 Coatings

The change in the diffusion reflection spectra and the total solar radiation absorption coefficient as by a reflecting heat-regulating coating (HRC) fabricated from ZnO pigment and K₂SiO₃ liquid potash glass in the People's Republic of China is investigated as a function of the flux density , the flux , and the energy E of electrons. The established regularities in the changes of a _s and under irradiation provide additional information on the formation of color centers (CC) in these systems and correlate with the results obtained previously for coatings fabricated in Russia.     

一种工业CT测量精度评估方法

为了验证工业CT系统对检测件的测量精度,设计了一套评估方法,针对由国家X射线数字化成像仪器中心自主研发的9 MeV 高能工业CT系统和450 kV工业CT系统,设计制作了标准测量试块,以三坐标测量机为辅助测量手段,对CT图像的线性尺寸、球面尺寸、角度尺寸、孔径尺寸和定位尺寸等进行对比测量,得到不同尺寸类型的测量误差。在不考虑尺寸类型的影响下,分别对铝、不锈钢和尼龙三种材料做了CT测量误差对比,结果表明,对于这三种材料来说,材料密度越大测量精度越高。实验结果表明,可验证工业CT系统对不同类型尺寸测量的精度,工业CT系统可完成精度较高的尺寸测量工作,特别对复杂结构的内部尺寸测量有一定的优势。     

Optical Degradation of a Fluoroplastic Coating Placed in a Geostationary Orbit

The results of ground-based tests of coatings under separate irradiation by electrons and protons with energies of several tens of kiloelectronvolts and under simultaneous irradiation by electromagnetic radiation with spectrum close to the solar one and by electrons, which imitate field conditions, are presented. Changes in the total solar radiation absorption coefficient have been predicted for a 30-year period of operation of the reflecting heat-regulating coating prepared from F4MB-grade fluoroplastic with deposited aluminum and placed in a geostationary orbit. The prediction is made under a special program which allows an optimal solution to be chosen from a set.     

Effects of synthesis condition and atomic group on conductivity of V2O5-doped ceria-based ceramics

The relationship between conductivity and activation energy was discussed in ceria-based ceramics. The conductivity of La-doped ceria solid solution with or without V₂O₅ additive was measured by AC impedance method and concluded that the conductivity and activation energy could be affected by a slight doping with extra atoms. The addition of V₂O₅ greatly improved the sintering characteristic of ceria solid solution and elevated about 15 % of relative density. The value of activation energy was also variable with the content of V₂O₅ addition. However, the minimum activation energy is consistent with the maximum conductivity not at random temperature. The intersection of the Arrhenius plot is moved to a lower temperature with increasing content of V₂O₅ below 0.05 mol% between the V₂O₅-doped and undoped samples. The total conductivity was lower than that of undoped sample at the low temperature but larger at a high temperature. Selecting suitable additive is considered as a useful method to prepared high-density and conductive ceramics.