The feasibility of utilizing molybdenum tailing and diatomite as siliceous materials to prepare calcium silicate board was explored.The influences of molybdenum tailing/diatomite proportion on hydration characteristic...The feasibility of utilizing molybdenum tailing and diatomite as siliceous materials to prepare calcium silicate board was explored.The influences of molybdenum tailing/diatomite proportion on hydration characteristics,thermal conductivity,water absorption,flexural strength and moisture adsorption-desorption property of calcium silicate board were investigated in detail.The experimental results reveal that molybdenum tailing is environmentally friendly to prepare building materials.The main hydration products in calcium silicate board under autoclaved condition are C-S-H with low crystallinity and tobermorite.Molybdenum tailing is favorable to the formation of tobermorite.The flexural strength and bulk density of the calcium silicate board gradually increase when the content of molybdenum tailing increases.Netlike C-S-H is formed with the increase of diatomite content during autoclaved curing process,resulting in the enhancement of moisture adsorptiondesorption performance and the reduction of thermal conductivity.The optimal content of molybdenum tailing is 20%,furthermore,the flexual strength and thermal conductivity of calcium silicate board at this content meet the Chinese standard JC/T564.1-2008.展开更多
Chalkboard erasers that are commonly used in many schools and education organizations have <span>the </span><span>poor ability in removing the dust off the chalkboard and collect them. The dust that ...Chalkboard erasers that are commonly used in many schools and education organizations have <span>the </span><span>poor ability in removing the dust off the chalkboard and collect them. The dust that is not collected will be taken into human bodies via inhalation, which will lead to respiratory diseases. Therefore, it is crucial to design a chalkboard eraser that can collect the dust effectively. If the eraser can be controlled both remotely and manually by people, it can further reduce the amount of dust taken in by human bodies. To achieve remote control, a micro-controller is needed to transfer the infrared radiation (IR) into signals that can control electric motors to move around on the chalkboard. Furthermore, the microfiber is also used as the cleaning material to improve the performance of dust cleaning and collecting. A vacuum pump is needed to create negative pressure between the eraser and the chalkboard so that the eraser can stick to it. The result shows a stronger ability in removing and collecting dust. With the help of the Arduino UNO board, the remote control is successfully achieved, and the eraser can move on the chalkboard freely according to the order.</span>展开更多
基金Funded by the National Key R&D Program of China(No.2017YFC0703206).
文摘The feasibility of utilizing molybdenum tailing and diatomite as siliceous materials to prepare calcium silicate board was explored.The influences of molybdenum tailing/diatomite proportion on hydration characteristics,thermal conductivity,water absorption,flexural strength and moisture adsorption-desorption property of calcium silicate board were investigated in detail.The experimental results reveal that molybdenum tailing is environmentally friendly to prepare building materials.The main hydration products in calcium silicate board under autoclaved condition are C-S-H with low crystallinity and tobermorite.Molybdenum tailing is favorable to the formation of tobermorite.The flexural strength and bulk density of the calcium silicate board gradually increase when the content of molybdenum tailing increases.Netlike C-S-H is formed with the increase of diatomite content during autoclaved curing process,resulting in the enhancement of moisture adsorptiondesorption performance and the reduction of thermal conductivity.The optimal content of molybdenum tailing is 20%,furthermore,the flexual strength and thermal conductivity of calcium silicate board at this content meet the Chinese standard JC/T564.1-2008.
文摘Chalkboard erasers that are commonly used in many schools and education organizations have <span>the </span><span>poor ability in removing the dust off the chalkboard and collect them. The dust that is not collected will be taken into human bodies via inhalation, which will lead to respiratory diseases. Therefore, it is crucial to design a chalkboard eraser that can collect the dust effectively. If the eraser can be controlled both remotely and manually by people, it can further reduce the amount of dust taken in by human bodies. To achieve remote control, a micro-controller is needed to transfer the infrared radiation (IR) into signals that can control electric motors to move around on the chalkboard. Furthermore, the microfiber is also used as the cleaning material to improve the performance of dust cleaning and collecting. A vacuum pump is needed to create negative pressure between the eraser and the chalkboard so that the eraser can stick to it. The result shows a stronger ability in removing and collecting dust. With the help of the Arduino UNO board, the remote control is successfully achieved, and the eraser can move on the chalkboard freely according to the order.</span>
