Abstract: The device includes a beam source for generating an electron beam, a beam guiding tube passed through an objective lens, an objective lens for generating a magnetic field in the vicinity of the specimen to focus the particles of the particle beam on the specimen, a control electrode having a potential for providing a retarding field to the particle beam near the specimen to reduce the energy of the particle beam when the beam collides with the specimen, a deflection system including a plurality of deflection units situated along the optical axis for deflecting the particle beam to allow scanning on the specimen with large area, at least one of the deflection units located in the retarding field of the beam, the remainder of the deflection units located within the central bore of the objective lens, and a detection unit to capture secondary electron (SE) and backscattered electrons (BSE).

Abstract: Disclosed is a method for clean metallurgy of molybdenum, including steps: 1) roasting molybdenite with calcium to obtain calcified molybdenum calcine, and leaching the calcified molybdenum calcine with an inorganic acid to obtain a molybdenum-containing inorganic acid leachate; 2) extracting molybdenum in the leachate with a cationic extractant to obtain an organic phase loaded with molybdyl cations and a raffinate; 3) using a hydrogen peroxide solution as a stripping agent to obtain a molybdenum stripping liquor; and 4) heating the molybdenum stripping liquor to dissociate peroxymolybdic acid therein so as to form a molybdic acid precipitate, and then calcining to obtain a molybdenum trioxide product. The method solves the problem of ammonia nitrogen wastewater production and can also be used for the enrichment and recovery of rhenium.

Abstract: The present disclosure provides automated equipment for drilling and workover operations of oil field, and an oil field workover operation device, an integrated hydraulic clamp, a buckling apparatus and a string automated operating apparatus, and a derrick floor pipe handling manipulator for use in the automated equipment. The automated equipment comprises a workover rig, a derrick floor, an elevator, a monkey-board string automatic placement apparatus, a slip, an oil field workover operation device, a power clamp, and a derrick floor pipe handling manipulator, and the workover rig, the derrick floor, the elevator, the monkey-board string automatic placement apparatus, the slip, the oil field workover operation device, the power clamp, and the derrick floor pipe handling manipulator cooperate with each other to realize a lifting operation and a lowering operation of a string at a wellhead.

Abstract: The technology disclosed includes systems and methods for using a deep learning trained classifier to detect obstacles and pathways in an environment in which a robot moves. The system includes logic to receive image information captured by at least one visual spectrum-capable camera and location information captured by at least one depth measuring camera located on a mobile platform. The system includes logic to determine a three-dimensional 3D point cloud of points having 3D information. The system can determine, using an ensemble of trained neural network classifiers, an identity for objects. The system includes logic to determine an occupancy map of the environment. The system includes logic to provide the occupancy map to a process for initiating robot movement to avoid objects in the occupancy map of the environment.

Abstract: The technology disclosed includes systems and methods for preparing a segmented occupancy grid map based upon image information of an environment in which a robot moves. The image information is captured by at least one visual spectrum-capable camera and at least one depth measuring camera. The system includes logic to receive image information captured by at least one visual spectrum-capable camera and location information captured by at least one depth measuring camera located on a mobile platform. The system includes logic to extract from the image information, features in the environment. The system includes logic to determine a 3D point cloud of points having 3D information. The system includes logic to determine, from the 3D point cloud, an occupancy map of the environment. The system includes logic to segment the occupancy map into a segmented occupancy map of regions that represent rooms and corridors in the environment.

Abstract: Current kidney organoids model development and diseases of the nephron but not the con-tiguous epithelial network of the kidney's collecting duct (CD) system. Here, we report the generation of an expandable, 3D branching ureteric bud (UB) organoid culture model that can be derived from primary UB progenitors from mouse and human fetal kidneys, or gen-erated de novo from human pluripotent stem cells. In chemically-defined culture conditions, UB organoids generate CD organoids, with differentiated principal and intercalated cells adopting spatial assemblies reflective of adult kidney's collecting system. Aggregating 3D-cultured nephron progenitor cells with UB organoids results in a reiterative process of branching morphogenesis and nephron induction, similar to kidney development. Applying a gene editing strategy to remove RET activity, we demonstrate genetically modified UB organoids can model congenital anomalies of kidney and urinary tract (CAKUT).

Abstract: A truss system may include a plurality of beams. Each beam of the plurality of beams may have various cross-sectional sizes in a same plane. Additionally, the plurality of beams may have a geometric arrangement such that a structural weight at required strength level may be reduced to achieve optimal design.

Abstract: Embodiments of this application disclose a video highlight determination method. The method includes: obtaining operation records of a target video, each operation record indicating a first play moment and an operation performed on the target video at the first play moment, and the first play moment being a play moment of the target video; obtaining, from the operation records, a quantity of operations of a target type that are performed on the target video at each play moment of the target video; and determining a target segment in the target video according to the quantity of operations. A ratio of a total quantity of operations of the target type performed on the target segment to a duration of the target segment is greater than a ratio of a total quantity of operations of the target type performed on the target video to a duration of the target video.

Abstract: A method to effectively share a message includes: establishing an association relationship between a first electronic device and a device account thereof; controlling the first electronic device to play first multimedia data by using the device account, sending an invitation link to a client corresponding to a second account; receiving, by using the device account, second message data sent by the client corresponding to the second account when the client corresponding to the second account accepts the invitation link; and sending first message data sent by a client corresponding to the first account and received by the device account and the second message data to the first electronic device, so as to display the message data on the first multimedia data.

Abstract: Provided are a method, an apparatus and a system for displaying bullet screen information. The method includes playing a target video, and displaying bullet screen information of the target video during the playing of the target video; displaying a reply window corresponding to currently displayed first screen information when a selection instruction corresponding to the first screen information is received; and receiving an information sending instruction corresponding to the reply window, obtaining second screen information input by a user in the reply window, displaying the second screen information corresponding to displaying of the first screen information, and transmitting, to a server, a reply information adding request corresponding to the first screen information, with the second screen information and an identifier of the first screen information being carried in the reply information adding request.

Abstract: Embodiments of this application disclose a video highlight determination method. The method includes: obtaining operation records of a target video, each operation record indicating a first play moment and an operation performed on the target video at the first play moment, and the first play moment being a play moment of the target video; obtaining, from the operation records, a quantity of operations of a target type that are performed on the target video at each play moment of the target video; and determining a target segment in the target video according to the quantity of operations. A ratio of a total quantity of operations of the target type performed on the target segment to a duration of the target segment is greater than a ratio of a total quantity of operations of the target type performed on the target video to a duration of the target video.

Abstract: The present disclosure relates to a common message sending method, an electronic device, and a non-transitory storage medium. According to user numbers on a platform, followers of a first user are acquired to construct a first subset, followers of a second user are acquired to construct a second subset. Common followers in the first subset and the second subset are acquired. A common message is sent to the common followers. The present disclosure further relates to an electronic device and a non-transitory storage medium. The common message sending method, the electronic device, and the storage medium according to the present disclosure achieve efficient, fast sending of a common message by massive, comparison of followers to send a common message.

Abstract: A solar water source heat pump air conditioning system includes an air-water heat exchange system, an aqueous solution heat exchange system, a heat pump main engine, a concentration system, an energy recovery system and a condensate water recovery system. According to the present invention, solar energy in air is absorbed by utilizing the air-water heat exchange system and is provided for a heat pump. Cold-heat transfer is performed between the air-water heat exchange system and the heat pump main engine by adopting the aqueous solution heat exchange system, thereby avoiding frosting and pipeline pollution. Cold energy of air-conditioning condensate water is collected by utilizing the condensate water recovery system and then is used, thereby increasing efficiency of the heat pump main engine. Air flowing through the air-water heat exchange system is purified by adopting a haze purification system, thereby improving air quality.

Abstract: The present invention relates to a wet evaporation-based cold concentration system, which is mainly applied to the technical field of air conditioners, and particularly applied to the technical field of heat-source tower heat-pump air conditioners. By utilizing a wet evaporation theory, a low-temperature low-concentration anti-freezing solution is enabled to contact low-temperature air in a wet evaporator to perform the heat and mass transfer, and water in the anti-freezing solution is vaporized at a low temperature into the air, thereby obtaining the high-concentration anti-freezing solution.

Abstract: The invention discloses a method and apparatus for retrofitting air conditioning system using all-weather solar heating. In air conditioning system in which original single cold host is equipped with a cooling tower and a boiler, plate heat exchanger, solar collector plate, energy storage tank and circulating pipelines are provided. The cooling tower is used to absorb the heat in the winter air. The solar collector plate is used to absorb solar thermal heat and transfer to the plate heat exchanger. The single cold machine is used to absorb the heat of the antifreeze liquid. The plate heat exchanger is provided to form a secondary cycle so as to avoid icing risk of the antifreeze liquid. At the outdoor temperature more than five degrees, the indoor users is heated without operating the boiler, which maintains summer operation performance and meanwhile increases winter heating function without changing the original system.

Abstract: Provided are a method, an apparatus and a system for displaying bullet screen information. The method includes playing a target video, and displaying bullet screen information of the target video during the playing of the target video; displaying a reply window corresponding to currently displayed first screen information when a selection instruction corresponding to the first screen information is received; and receiving an information sending instruction corresponding to the reply window, obtaining second screen information input by a user in the reply window, displaying the second screen information corresponding to displaying of the first screen information, and transmitting, to a server, a reply information adding request corresponding to the first screen information, with the second screen information and an identifier of the first screen information being carried in the reply information adding request.

Abstract: Provided are a method, an apparatus and a system for displaying bullet screen information. The method includes playing a target video, and displaying bullet screen information of the target video during the playing of the target video; displaying a reply window corresponding to currently displayed first screen information when a selection instruction corresponding to the first screen information is received; and receiving an information sending instruction corresponding to the reply window, obtaining second screen information input by a user in the reply window, displaying the second screen information corresponding to displaying of the first screen information, and transmitting, to a server, a reply information adding request corresponding to the first screen information, with the second screen information and an identifier of the first screen information being carried in the reply information adding request.