Abstract: A lifting/lowering underframe and a load-bearing device having same. The lifting/lowering underframe comprises a lifting/lowering mechanism (2) which comprises a first lifting/lowering frame (21), a second lifting/lowering frame (22) and a driving member (23). The two ends of the driving member (23) are connected to the first lifting/lowering frame (21) and the second lifting/lowering frame (22) respectively; the driving member (23) is an electric push rod, and the driving member (23) kept between the first lifting/lowering frame (21) and the second lifting/lowering frame (22) can electrically drive the first lifting/lowering frame (21) and the second lifting/lowering frame (22) to move relative to each other. The lifting/lowering mechanism (2) is easy to maintain, has low noise and can work normally in high/low temperature and anticorrosion/explosion-proof harsh environments.

Abstract: The present application relates to a luminescent material and a preparation method thereof. The luminescent material having a chemical formula of M1-x-y-zNbO3:xPr,yEr, where M is alkali metal element, 0.001?x?0.05, 0.001?y?0.1, and ?0.05?z?0.05. The luminescent material is a dual-lifetime (fluorescence and long-lasting luminescence) and colorful (red, orange, yellow, yellow green and green) renewable luminescent material that respond to multiple stimulation (heat, force and light), and has a characteristic of multidimensional identifiability such as excitation mode, luminescence lifetime and luminescence color.

Abstract: The present application relates to a luminescent material and a preparation method thereof. The luminescent material having a chemical formula of M1-x-y-zNbO3:xPr,yEr, where M is alkali metal element, 0.001?x?0.05, 0.001?y?0.1, and ?0.05?z?0.05. The luminescent material is a dual-lifetime (fluorescence and long-lasting luminescence) and colorful (red, orange, yellow, yellow green and green) renewable luminescent material that respond to multiple stimulation (heat, force and light), and has a characteristic of multidimensional identifiability such as excitation mode, luminescence lifetime and luminescence color.