Abstract: A crystal growth device and a crystal growth method of a silicon carbide single crystal are provided. The growth device includes a crucible portion including first and second crucible portions coaxially provided; and a heating portion including first, second, and third heating portions. A seed crystal accommodation portion is provided in the middle of a top of the first crucible portion. The second crucible portion is provided with a cavity as a raw material accommodation portion. The first crucible portion's outer diameter is smaller than the second crucible portion's. A concavity recessed towards the first crucible portion is provided in the middle of a bottom of the second crucible portion. The first, second, and third heating portions are circumferentially provided in the concavity, the second crucible portion, and outside the first crucible portion respectively. The third heating portion's inner diameter is smaller than the second crucible portion's outer diameter.

Abstract: This invention discloses an adaptive low-power method, device, and medium for the MAC layer of a wireless sensor network. The method includes: determining the environmental traffic based on the number of packets sent and received by nodes within a set timeframe; obtaining the remaining battery energy percentage; establishing the average node frequency based on the power of all nodes; setting the maximum duty cycle frequency (RDCmax) and minimum duty cycle frequency (RDCmin). When the remaining battery energy percentage is above 50%, adjusting the current duty cycle frequency based on the environmental traffic; when the remaining battery energy percentage is approximately 20% to 50%, reducing the maximum duty cycle frequency (RDCmax) to limit the maximum change in duty cycle frequency while adjusting the current duty cycle frequency based on environmental traffic.

Abstract: Provided in the present invention is a novel diaroyl carbazole compound, used together with a carbazolyl oxime ester photoinitiator to show a significant synergistic initiation effect in a photoresist composition; the best sensitising effect is shown when the molar ratio of the diaroyl carbazole compound and the carbazolyl oxime ester photoinitiator is 0.1-1.4.

Abstract: Provided is a photoinitiator composition containing an acylcarbazole derivative and a carbazolyl oxime ester. The photoinitiator composition is used in a photocurable composition, especially a photoresist formulation, and exhibits the best sensibilization effect when the molar ratio of the acylcarbazole derivative to the carbazolyl oxime ester photoinitiator is between 0.1 and 1.4.

Abstract: A diketone oxime ester compound shown in formula I and a manufacturing method therefor, and a photo-curable composition using the compound of formula I as a photoinitiator. The composition has extremely high light sensitivity and relatively low yellowing resistance when applied to prepare a color filter for a light resistance device such as a display screen.

Abstract: A polyacrylate macromolecular photoinitiator, a synthesis method therefor, and the use thereof. The polyacrylate macromolecular photoinitiator is free of a component having a molecular weight of less than 1000, and can effectively avoid the introduction of a material having a mall molecular weight in the photoinitiator and the odor and migration contamination produced thereby, the general formula thereof being as shown in formula I.

Abstract: The disclosure discloses an optical imaging system, which sequentially includes from an object side to an image side along an optical axis: a diaphragm; a first lens with a positive refractive power; a second lens with a refractive power; a third lens with a refractive power; a fourth lens with a refractive power; a fifth lens with a refractive power; a sixth lens with a refractive power, an object-side surface thereof is a convex surface; and a seventh lens with a positive refractive power, wherein an effective focal length f of the optical imaging system and an entrance pupil diameter (EPD) of the optical imaging system satisfy: f/EPD<1.3; and TTL is an on-axis distance from an object-side surface of the first lens to an imaging surface, Semi-FOV is a half of a maximum field of view of the optical imaging system, and TTL and Semi-FOV satisfy: 3.0 mm<TTL×Tan(Semi-FOV)<4.0 mm.

Abstract: Provided in the present invention is a novel diaroyl carbazole compound, used together with a carbazolyl oxime ester photo initiator to show a significant synergistic initiation effect in a photoresist composition; the best sensitising effect is shown when the molar ratio of the diaroyl carbazole compound and the carbazolyl oxime ester photoinitiator is 0.1-1.

Abstract: Provided is a photoinitiator composition containing an acylcarbazole derivative and a carbazolyl oxime ester. The photoinitiator composition is used in a photocurable composition, especially a photoresist formulation, and exhibits the best sensibilization effect when the molar ratio of the acylcarbazole derivative to the carbazolyl oxime ester photoinitiator is between 0.1 and 1.4.

Abstract: Involved are a diketone oxime ester compound shown in formula I and a manufacturing method therefor, and a photo-curable composition using the compound of formula I as a photoinitiator. The composition has extremely high light sensitivity and relatively low yellowing resistance when applied to prepare a color filter for a light resistance device such as a display screen.

Abstract: A polyacrylate macromolecular photoinitiator, a synthesis method therefor, and the use thereof. The polyacrylate macromolecular photoinitiator is free of a component having a molecular weight of less than 1000, and can effectively avoid the introduction of a material having a mall molecular weight in the photoinitiator and the odor and migration contamination produced thereby, the general formula thereof being as shown in formula I.

Abstract: The present invention provides a photocurable composition prepared using mercapto benzophenone compounds as key raw materials. The present invention aims to solve the problems existing in the prior photo-curing technology that low-molecular photoinitiators are easy to remain and migrate, while macromolecular photoinitiators has low initiation efficiency due to a low content of effective components and also has the problem of certain migration. The photocurable composition in the present invention can be easily prepared and has high addition efficiency with ethylenically unsaturated compounds, and the photocurable composition obtained by addition has no residual mercapto and has features of high initiation activity and zero migration rates when it is used in photocurable coatings, binder and ink formula.

Abstract: The present invention provides a photocurable composition prepared using mercapto benzophenone compounds as key raw materials. The present invention aims to solve the problems existing in the prior photo-curing technology that low-molecular photoinitiators are easy to remain and migrate, while macromolecular photoinitiators has low initiation efficiency due to a low content of effective components and also has the problem of certain migration. The photocurable composition in the present invention can be easily prepared and has high addition efficiency with ethylenically unsaturated compounds, and the photocurable composition obtained by addition has no residual mercapto and has features of high initiation activity and zero migration rates when it is used in photocurable coatings, binder and ink formula.

Abstract: The present invention provides a photocurable composition prepared using mercapto benzophenone compounds as key raw materials. The present invention aims to solve the problems existing in the prior photo-curing technology that low-molecular photoinitiators are easy to remain and migrate, while macromolecular photoinitiators has low initiation efficiency due to a low content of effective components and also has the problem of certain migration. The photocurable composition in the present invention can be easily prepared and has high addition efficiency with ethylenically unsaturated compounds, and the photocurable composition obtained by addition has no residual mercapto and has features of high initiation activity and zero migration rates when it is used in photocurable coatings, binder and ink formula.