Beijing Boe Technology Development Co., Ltd.

China Institute of Water Resources and Hydropower Research

Changjun Liu

Tianyue Zhao

Long Chen

Xianzhen Li

Zhichao Li

Tianxiao Zhao

Yun Liu

Lang Yu

Wenjing Lu

Wenlong Song

Yizhu Lu

Pu Zhou

Xiuhua Chen

Mengyi Li

A rapid monitoring and discrimination method for drought conditions in summer maize based on chlorophyll content includes: 1) Obtaining multi-spectral imagery through UAV multi-payload low-altitude remote sensing technology and measuring chlorophyll content on the ground. Additionally, calculating vegetation indices including Normalized Difference Vegetation Index (NDVI), Soil-Adjusted Vegetation Index (SAVI), and Renormalized Difference Vegetation Index (RENDVI). 2) Selecting vegetation indices and constructing regression equations with measured chlorophyll content during different growth stages. The regression equation with the highest correlation for each growth stage is chosen as the optimal model equation for that particular stage. 3) Using the optimal model equations to retrieve chlorophyll content for each period and determining thresholds for chlorophyll content across different drought levels through calibration. 4) Calculating the required vegetation indices from real-time multi-spectral imagery of the field under test, retrieving chlorophyll content, and comparing it with the established thresholds to assess the real-time drought level.

Rapid UAV-based monitoring and discrimination method for drought in summer maize based on chlorophyll content

A bone repair material, a preparation method of the bone repair material, and a biological composite scaffold are provided. The bone repair material includes: a base material, and a carbon nanomaterial and a polypeptide both mixed with the base material; and the carbon nanomaterial and the polypeptide are bonded by chemical bonds. The preparation method includes: bonding a carbon nanomaterial with a polypeptide by chemical bonds; and mixing the carbon nanomaterial and the polypeptide bonded by the chemical bonds with a base material, and performing a molding treatment.

Bone repair material and preparation method thereof, and biological composite scaffold

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Beijing, China

Changjun Liu