Abstract: A vapor chamber includes a first cover plate, a second cover plate, and a capillary structure. The first cover plate and the second cover plate form a closed cavity between the first cover plate and the second cover plate. The capillary structure is located in the cavity, and the capillary structure is configured to guide flow of liquid in the cavity. The cavity includes a first cavity and a second cavity that coupled to each other, the first cavity is located in a first area of the vapor chamber, the second cavity is located in a second area of the vapor chamber, and the first area is configured to couple to a heating element of the electronic device. A size of the second cavity in thickness direction is greater than a size of the first cavity in thickness direction.

Abstract: A regulating cementitious material for promoting hydration of Portland cement is provided. The regulating cementitious material may include ingredients by weight as follows: ye'elimite, 27˜68 parts; anhydrite, 29˜68 parts; lithium nitrite, 2˜5 parts; ethylene glycol monoisopropanolamine, 0.14˜0.29 parts; triethanolamine acetate, 0.04˜0.09 parts; and polyglycerol, 0.04˜0.09 parts. An early strength of Portland cement can be improved through a cooperative hydration between minerals and an enhanced solubilization of a complexing agent.

Abstract: A regulating cementitious material for promoting hydration of Portland cement is provided. The regulating cementitious material may include ingredients by weight as follows: ye'elimite, 27˜68 parts; anhydrite, 29˜68 parts; lithium nitrite, 2˜5 parts; ethylene glycol monoisopropanolamine, 0.14˜0.29 parts; triethanolamine acetate, 0.04˜0.09 parts; and polyglycerol, 0.04˜0.09 parts. An early strength of Portland cement can be improved through a cooperative hydration between minerals and an enhanced solubilization of a complexing agent.