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Some animals like geckos have evolved attachment organs that allow them to generate attractive force while negotiating their surroundings. It has been found that biological adhesion is related to the contact area. The adhesion originated from van der Waals interactions may be affected by external electric fields， including the electric field caused by triboelectrification. The triboelectrification has been confirmed in geckos， and the measurement of reaction force and real contact area is also successfully carried out. Whereas，there is no simultaneous measurement and comprehensive studies of the above three parameters because there are conflicts among the requirements of their measurement technologies. After comprehensively considering the test requirements，we develop a new sensor to measure the above three parameters at the same time. An experiment with geckos is also conducted to verify the availability and reliability of the newly developed sensor，laying an equipment foundation for future studies on biological and bio⁃inspired adhesion. [ABSTRACT FROM AUTHOR]

The charging system of COREX melter gasifier consists of one coal-gimbal distributor and eight DRI-flap distributors. As the DRI-flag distributor is a new type of distributor， few research is found to help to understand the charging process of DRI-flap distributor in depth. In this study， a mathematical model of charging process of the DRI-flag distributor was developed based on discrete element method and was used to investigate the effect of operating parameters during charging process. The relationship between the flap angle and radial position was obtained when studying the effect of flap angle on the landing position. After examing the formation process and internal segregation of the stock pile， the size segregation in the radial direction was revealed. Meanwhile， the distribution of ore and coke in the radial direction was given during their mixture charging process. These modeling results can guide us to adjust charging mode in COREX production field. [ABSTRACT FROM AUTHOR]