Abstract: Disclosed herein is a polyurethane prepolymer composition, including a reaction product of an isocyanate component and a polyol component, where the reaction product includes isocyanate groups at an amount of from 5.0 to 13.0 wt %, based on the total weight of the isocyanate component and the polyol component, and the polyol component has a functionality in a range of from 1.5 to 3.0. Further disclosed herein is a laminate including the polyurethane prepolymer composition. Additionally disclosed herein are a process of preparing the polyurethane prepolymer composition, the laminate, and a method of using the laminate.

Abstract: The invention relates to respirator technology, in particular to an adaptive auxiliary air supply respirator and a control method thereof. The respirator comprises: a sealing face shield covering the area of the mouth and nose, an internal chamber being formed within the sealing face shield; an exhalation valve connected to the sealing face shield, communicating with the internal chamber, and configured to open unidirectionally during exhalation; an intake chamber located inside the sealing face shield and equipped with an inhalation valve which opens unidirectionally during inhalation; a filter mounted on the sealing face shield and communicating with the intake chamber; and an auxiliary air supply mechanism comprising a fan extending into the intake chamber, a controller for controlling a speed of the fan, and a sensor arranged inside the sealing face shield. The fan draws external air, accelerating during inhalation and decelerating during exhalation, improving user experience.

Abstract: The invention relates to respirator technology, in particular to a method and system for controlling the pressure in a mask, and a respirator. The method comprises: arranging a fan on a mask, wherein the fan, after being started, continuously supplies air into the mask; determining a correlation between a fan speed, a pressure in the mask and respiratory behaviors of a user; and controlling, in an operating process of the fan, the fan speed according to the pressure acquired in real time and the correlation. The fan, after being started, continuously supplies air into the mask, the fan speed is dynamically controlled according to the acquired pressure and the determined correlation, and the system can control the air supply according to real-time requirements of users to minimum the respiratory resistance. The method offers a personalized, real-time ventilation solution that adjusts to users' respiratory needs, effectively reducing respiratory resistance.

Abstract: Disclosed is a method for enhancement of a low-light image based on reinforcement learning and aesthetic evaluation. The method include: generating images of non-normal luminance under different lighting scenes, and constructing a training dataset for a reinforcement learning system based on the images; initializing the training dataset, a policy network, and a value network; updating, based on a no-reference reward score and an aesthetic assessment reward score, the policy network and the value network; completing model training and outputting an enhanced image result. By expanding the action space range defined in reinforcement learning, the enhancement operations for the input low-light image gain a greater dynamic range, offering higher flexibility for real-world scenarios and better meeting low-light image enhancement needs.

Abstract: The invention relates to respirator technology. in particular to an atmospheric pressure compensation control system for a powered air-purifying respirator and a method. The atmospheric pressure compensation control system comprises a main unit and a battery pack, wherein a waterproof breathable membrane is installed over a through hole formed in an outer shell of the main unit or the battery pack; A collection module inside the main unit or battery pack detects atmospheric pressure in real time, while the chamber contains conversion, comparison, and control modules. The conversion module converts atmospheric pressure into an electrical signal, which is then processed by the comparison module to calculate and compare the pressure difference with a standard. The control module adjusts the fan speed in real time based on the pressure difference to maintain a constant internal-external pressure differential, ensuring stable airflow and the normal operation of the respirator.

Abstract: A giant cavity surface-emitting laser includes a giant cavity, a lower Bragg reflector, and an upper Bragg reflector. The giant cavity includes a multi-junction active region containing at least two active layers, and the giant cavity includes at least one of: an anti-reflection light reservoir located between the multi-junction active region and the lower Bragg reflector or an anti-reflection light reservoir located between the multi-junction active region and the upper Bragg reflector, where the anti-reflection light reservoir is configured to increase an optical field intensity peak of the anti-reflection light reservoir to a value higher than an optical field intensity peak of the multi-junction active region and store optical field energy, and a current confinement layer defining a light-emitting region is disposed within the multi-junction active region or near the outer side of the multi-junction active region.

Abstract: Disclosed is a method for enhancement of a low-light image based on reinforcement learning and aesthetic evaluation. The method include: generating images of non-normal luminance under different lighting scenes, and constructing a training dataset for a reinforcement learning system based on the images; initializing the training dataset, a policy network, and a value network; updating, based on a no-reference reward score and an aesthetic assessment reward score, the policy network and the value network; completing model training and outputting an enhanced image result. By expanding the action space range defined in reinforcement learning, the enhancement operations for the input low-light image gain a greater dynamic range, offering higher flexibility for real-world scenarios and better meeting low-light image enhancement needs.

Abstract: The present disclosure relates to the technical field of magnesium metallurgy, and in particular to a device and method for magnesium smelting by vacuum carbothermal reduction of calcined dolomite. The device includes a reaction chamber, a condensation chamber, a first temperature regulation module and an air pressure regulation module, and the reaction chamber is communicated with the condensation chamber via a gas-guide tube. In the present disclosure, different condensation zones are utilized to sequentially condense gaseous products based on dew points, effectively preventing impurities from entering the condensation process of magnesium.

Abstract: A trigger driving apparatus and hand-held terminal having said apparatus are provided. Wherein the trigger driving apparatus comprises a bracket (8) and a movable trigger housing arranged on the bracket, and further comprises: a drive device, wherein a drive shaft of the drive device is connected to one end of a link rod mechanism, the other end of the link rod mechanism is connected to the trigger housing, and the drive shaft is configured to drive the trigger housing to move; a detection device is configured to detect the state of the trigger housing; a control device is configured to receive the state signal detected by the detection device, and control the output torque of the drive device according to the state signal.

Abstract: A gamepad and a joystick feedback force apparatus thereof are disclosed. The joystick feedback force apparatus comprises a joystick that is configured to accept a user's operation and is rotatably installed in a casing of the gamepad. It further comprises a torque output device and a deceleration device. An output shaft of the torque output device is connected with an input end of the deceleration device, an output end of the deceleration device is connected with a rotating shaft of the joystick to apply a torque output by the torque output device to the rotating shaft. When the user operates the joystick to rotate, a certain torque is applied to the rotating shaft after being decelerated by the deceleration device, namely, the corresponding torque is applied to the joystick to form a feedback force to the user.

Abstract: Described herein is a process for preparing polyurethane sheet/laminate with reduced bubbles, including the steps of applying a polyurethane system obtained by mixing an isocyanate component (A) and a polyol composition component (B) to form a base coat layer, where the components (A) and (B) are kept separately in tanks under vacuum before mixing, and the application of the polyurethane system is implemented via knife coating under relative humidity of 65% or below. Further described herein are a polyurethane sheet/laminate prepared by the described process and a synthetic leather made from the polyurethane sheet/laminate.

Abstract: A medical image processing method and processing apparatus, and a computer readable storage medium. The method includes: obtaining a to-be-processed image; performing a feature extraction on the to-be-processed image to obtain a corresponding feature image; and re-determining a pixel value of each pixel in the to-be-processed image based on first information and second information of a corresponding pixel in the feature image, and processing the to-be-processed image; wherein the first information is information of a pixel adjacent to the corresponding pixel in the features image, and the second information is information of a pixel that is not adjacent to and is similar to the corresponding pixel in the features image.

Abstract: A gamepad and a joystick feedback force device therefor are disclosed. The joystick feedback force device comprises a joystick that is configured to accept a user's operation and is rotatably installed in a casing of the gamepad. The joystick feedback force device further comprises a torque output device, and an output shaft of the torque output device is connected with a rotating shaft of the joystick, so that a torque is applied to the rotating shaft to form a feedback force to the joystick.

Abstract: A method for preparing a construction material for a roadbed and a pavement by using construction solid waste-based geopolymers includes: preparing a construction solid waste-based geopolymer cementitious material and construction solid waste-based recycled sand by using construction solid wastes, and then preparing the construction material by batching, stirring, molding, and curing the cementitious material and the recycled sand with aggregates and water. Barium hydroxide is determined as a main activator and a high-pressure activation is performed, thereby promoting a dissolution efficiency of active silicon and aluminum in the construction solid wastes; and a compensator is added to promote polymerization to obtain the cementitious material with a compact three-dimensional network structure.

Abstract: Methods and apparatuses for training a magnetic resonance imaging model, electronic devices and computer readable storage media are provided.

Abstract: The present disclosure relates to a device and method for recovering arsenic and gallium. A closed furnace body is in communication with a vacuuming pipe, and the vacuuming pipe is connected to a vacuuming mechanism. The closed furnace body includes a first furnace body, a second furnace body and a third furnace body. A first heating mechanism and a graphite crucible are arranged inside the first furnace body, the first heating mechanism being used for heating the graphite crucible. A first collection cylinder is in communication with a second collection cylinder. The device for recovering arsenic and gallium of the present disclosure is arranged with a structure for realizing directional condensation of gallium arsenide clusters and arsenic vapor, respectively, to realize high-purity recovery of arsenic and gallium.

Abstract: A method for processing positron emission tomography data is provided, this method includes: obtaining a first coordinate and a second coordinate respectively corresponding to two ends of a response line to be processed; determining corresponding dimensional coordinates of the response line to be processed in a sinogram based on the first coordinate and the second coordinate; and generating the sinogram corresponding to the response line to be processed based on the dimensional coordinates. According to this method, the amount of calculation of system matrix is reduced, the accuracy of position information of the generated response line is improved, and the accuracy of generated sinogram is improved accordingly.

Abstract: The technology of this application relates to a signal processing apparatus having functions of communication and positioning and sensing, so that complexity of a photoelectric detector array is reduced. The apparatus includes N photoelectric detector unit subarrays and M output ports respectively connected to the N photoelectric detector unit subarrays, where at least two of the N photoelectric detector unit subarrays are different, a quantity of photoelectric detector units included in at least one of the N photoelectric detector unit subarrays is greater than or equal to 2, N is an integer greater than or equal to 2, and M is an integer less than or equal to N. A photoelectric detector unit in the N photoelectric detector unit subarrays is configured to perform photoelectric conversion on an optical signal, to obtain a first electrical signal, and the M output ports are configured to output the first electrical signal.

Abstract: The present invention relates to a one-pot process for the production of poly carbodiimide cured polymers. comprising a reaction of (a) at least one polycarbodiimide with two or more carbodiimide functionalities per molecule. (b) at least one polyol with two or more hydroxyl functionalities per molecule, and (c) at least one cyclic carboxylic anhydride.

Abstract: Provided are a vacuum distillation furnace, and a method for preparing high-purity copper particles. In view of the fact that high-purity copper prepared by the traditional method in the current industrial production has an unsatisfactory purity, a high impurity content, and a complicated composition, a vacuum distillation method is adopted. During the vacuum distillation method, most of valuable metals in a copper matrix are volatilized and enter into a gas phase, such that the metals are separated from the copper matrix, thereby allowing the purification of copper; and copper powder particles volatilized to a condensation plate have a smooth surface and a purity of 5 N grade or more.