Tsinghua University

Chinese Academy of Sciences

Ke Zheng

Zheng Zhang

Hongyi Li

Ping Tang

Changmiao Hu

Xiaojun Shan

Yiheng Dai

Wentian Xiang

Huaping Xu

A remote sensing image geometric normalization method and apparatus. The method comprises: constructing a pyramid tile structure for a reference image, and releasing reference tile data; calculating the level of a tile to be downloaded and the name of the tile to be downloaded, and downloading corresponding data from the reference tile data to obtain a standard tile set; performing first geometric correction on the image to be subjected to geometric normalization and tiles in the standard tile set to obtain a first image processing result; matching the first image processing result with the tiles in the standard tile set to obtain a plurality of control points, and calculating a result evaluation precision; and determining whether to perform second geometric correction on the first image processing result.

Remote sensing image geometric normalization method and apparatus

A method for extracting and enriching gold with a selenide includes: mixing an isocyanate and a selenium-containing compound of a formula of HO&#x2014;R&#x2014;Se&#x2014;R&#x2014;OH in a solvent to obtain a mixture system, where R is selected from linear or branched Cto Calkylene groups; adding a tin-based catalyst into the mixture system to activate a reaction, drying the mixture system after the reaction, and obtaining a powdery selenium-containing polymer by grinding; immersing the selenium-containing polymer in an aqueous solution containing gold ions to allow gold to be extracted from the aqueous solution; and removing the selenium-containing polymer attached to a surface of extracted gold, thereby obtaining an extracted and enriched gold.

Method for extracting and enriching gold with selenide

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Beijing, China

Ke Zheng