Karibibite,a new FeAs mineral from South West Africa     

Oleg V Knorring  Th.G Sahama  Pentti Rehtijärvi 《Lithos》1973,6(3):265-271

Karibibite (ideally, Fe₂As₄O₉) occurs in vugs in massive loellingite of the Karibib pegmatite area, South West Africa. It is brownish yellow and finely fibrous. The thickness of the soft, single fibers is less than 1 micron, unsuitable for single-crystal X-ray study. Electron diffraction and X-ray powder pattern indicate that the mineral is orthorhombic, with $\text{a}{}_0\text{= 27.91}\text{A}\text{?}\text{, b}{}_0\text{= 6.53}\text{A}\text{?}\text{and c}{}_0\text{(}\text{fiber axis}\text{) = 7.20}\text{A}\text{?}$. The space group cannot be given. The mineral is paramagnetic with yellow fluorescence and is pleochroic with γ > 2.10, α = 1.96, 2V_α large, d = 4.07. It is soluble in acids and alkali hydroxide. Decomposition starts around 320 °C. The infra-red absorption spectrum indicates absence of AsO₄ groups. The mineral is classified tentatively as an oxide or arsenite.  相似文献   

Designing laboratory wind simulations using artificial neural networks     

Josip Križan  Goran Gašparac  Hrvoje Kozmar  Oleg Antonić  Branko Grisogono 《Theoretical and Applied Climatology》2015,120(3-4):723-736

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Condor-E Spacecraft with a Synthetic Aperture Antenna and Its Capabilities     

Babokin  M. I.  Efimov  A. V.  Zaytsev  S. E.  Karpov  O. A.  Savosin  G. V.  Titov  M. P.  Tolstov  E. F.  Turuk  V. E.  Tsvetkov  O. E. 《Izvestiya Atmospheric and Oceanic Physics》2017,53(9):1205-1215

Izvestiya, Atmospheric and Oceanic Physics - The main parameters of a small spacecraft (SSC) (Condor-E) and its onboard radar with a synthetic aperture antenna (SAR) are presented in the paper. Two...  相似文献