Abstract: Disclosed is a coated rubber particle, preparation thereof and its application as a plugging material in drilling fluids. The coated rubber particle comprises a rubber core and a coating layer, wherein the core has a fluorine content (at %) of 0-15%, the coating layer has a fluorine content (at %) of 30-80%, and the coated rubber particle has a 24-hour oil absorption rate of 4% or less. The coated rubber particle has good oil resistance, and is particularly suitable for use as a plugging material in drilling fluids, particularly oil-based drilling fluids.

Abstract: A hinge mechanism and a foldable electronic device are provided. The hinge mechanism is disposed in a foldable electronic device. When one rotation portion of the foldable electronic device moves, the hinge mechanism drives the other rotation portion to move. The hinge mechanism includes a fastening support, a transmission assembly, two first transmission shafts, a clamping assembly, and a first elastic portion. The fastening support is configured to be fastened to a base of the foldable electronic device, and the fastening support is coupled to the first transmission shaft to limit relative positions of the first transmission shaft and the fastening support. The first transmission shaft is coupled to the clamping assembly and the first elastic portion. The first elastic portion provides an elastic force for the clamping assembly such that friction between the clamping assembly and the transmission assembly generates damping.

Abstract: An ultra-high-speed fully automatic precision spectral analysis system for rare earth metals and its working method is disclosed. The system includes a central control server, a precision numerical control rotary table communicatively connected with the central control server, a sample loading-clamping device, an automatic weighing device, an automatic ranging device, an analyzing surface machining device, a rare-earth spark emission spectrometer, and an automatic marking device; the sample loading-clamping device is arranged to fix a test sample of a rare earth metal, the automatic weighing device is arranged to weigh the test sample in real time, and the automatic ranging device, the analyzing surface machining device, the rare-earth spark emission spectrometer, and the automatic marking device are set up around the precision numerical control rotary table to perform the corresponding work processes respectively.

Abstract: A single pulse spectral statistical analysis method for particle size distribution of inclusions on a surface of a metal material is provided.

Abstract: The present disclosure relates to a composite fin structure for a radiator, comprising a plurality of elongated corrugated fins arranged in parallel and spaced apart from each other. Air flow channels are defined between the opposing main side surfaces of adjacent fins, allowing cooling air to flow therethrough along a longitudinal direction of the fins. It is characterized in that each fin comprises a first corrugated fin section having a first waveform and a second corrugated fin section having a second waveform, with extending directions of the first and second waveforms being consistent with the longitudinal direction of the fin. A fin density of the first waveform is greater than that of the second waveform, and the first corrugated fin section extend at least in an inlet side region of each air flow channel. This invention also relates to a radiator with the composite fin structure, as well as a fuel cell cooling system comprising the radiator.

Abstract: The present disclosure relates to a fin structure for a radiator, comprising a plurality of elongated fins arranged in parallel and spaced apart from each other, wherein an air flow channel is defined between opposing main side surfaces of adjacent two fins for allowing cooling air to flow therethrough along a fin longitudinal direction; a corrugated section extending in the fin longitudinal direction is formed on each fin; and the fins are arranged such that for adjacent fins, the peaks of the corrugated sections are aligned in the arranging direction of the fins and troughs of the corrugated sections are aligned in the arranging direction of the fins, characterized in that, in each wavy unit of the corrugated section, the wave peak is offset from a central plane between two adjacent wave troughs and approaches an inclined slope extending between a wave peak and a wave trough in an adjacent wavy unit of a corrugated section of an adjacent fin.

Abstract: This application aims to provides a method for controlling an air conditioning system, an air conditioning system, a computer-readable storage medium, a mobile terminal device and a server so as to at least solve or alleviate part of the problems in the prior art. In the first aspect, this application provides a method for controlling an air conditioning system, the air conditioning system including a plurality of indoor units arranged in different regions. The control method includes: a step for acquiring occupancy information, acquiring occupancy information of the region; a step for acquiring electric energy information, acquiring electric energy information containing an electric energy characteristic; and a step for generating an energy storage instruction, generating an energy storage instruction for a specific region on the basis of the occupancy information when the electric energy information satisfies a predetermined energy storage condition.

Abstract: Disclosed is a temperature controller, a server, an air conditioning system and a temperature setting method. The temperature controller may be configured to operate in a carbon saving mode, and when operating in the carbon saving mode, the set temperature of the temperature controller is adjusted according to a green electricity index, and the green electricity index is the proportion of green electricity in a power grid to which the temperature controller is connected. When the proportion of the green electricity is high, i.e., the electric energy used is mainly from renewable energy sources, the set temperature is adjusted to produce more cold energy or heat energy for storage; and when the green electricity index decreases, the stored cold energy or heat energy can be used to meet the demand for cooling or heating, thereby reducing carbon emissions.

Abstract: A building chiller/heat pump system includes a chiller/heat pump system for supplying a conditioned fluid to change a temperature of air being delivered into a building. The chiller/heat pump system is provided with a control to achieve a desired setpoint of the air delivered into the building. The control is programmed to receive a prediction of expected remission levels in energy that will be delivered to power the chiller/heat pump system. The control is programmed to change the setpoint such that an energy level required to operate the chiller/heat pump system to achieve the setpoint will drop when the expected emissions level increases, and adjusts the setpoint in an opposed direction when the expected emissions drops. A method is also disclosed.

Abstract: An electrochemical apparatus includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte. The negative electrode includes a negative electrode current collector and a negative electrode active material layer disposed on a surface of the negative electrode current collector, where the negative electrode active material layer includes a negative electrode binder with structural formula I. In the technical solution of this application, the negative electrode binder has the structural formula I, which provides a large number of lithium ion exchange sites to enhance ionic conductivity of the negative electrode binder, thereby improving fast charging performance and discharging performance of the electrochemical apparatus in a low-temperature environment.

Abstract: This application provides a hinge mechanism and an electronic device. One example hinge mechanism includes a base, and a first rotating assembly and a second rotating assembly that are respectively disposed on two sides of the base. When the first rotating assembly and the second rotating assembly rotate toward each other, a length of the hinge mechanism may be increased; or when the first rotating assembly and the second rotating assembly rotate opposite to each other, a length of the hinge mechanism may be shortened, and a support surface for supporting a flexible display can be formed.

Abstract: A preparation method for optically active citronellal, which can obviously enhance the catalytic stability of an optically active transition metal catalyst for asymmetric hydrogenation of homogeneous catalysis and thereby achieve higher turnover numbers. In the preparation method for optically active citronellal, a substrate is subjected to an asymmetric hydrogenation reaction in the presence of the transition metal catalyst to generate the optically active citronellal, wherein the transition metal catalyst is obtained by reacting a transition metal compound with an optically active ligand containing two phosphorus atoms, and the raw material of the substrate is one of neral and geranial or a combination thereof to control the hydroxyl value to be less than or equal to 6 mgKOH/g and/or the iron content to be less than or equal to 50 ppm in the raw material of the substrate for the asymmetric hydrogenation reaction.

Abstract: A spark spectrometry for inclusions content distribution on the surface of large size metallic materials, comprising the following steps: analyzing the surface of large-size metallic materials by spark discharge continuous excitation scanning, obtaining a mixture intensity distribution data of the solid solution and inclusions of an element on the surface of the large-size metallic materials; the relative frequency distribution diagram of spectral intensity is subjected to peak fitting of normal distribution and Gumbel distribution, obtaining an extreme value distribution data of spectral intensity of the inclusions; a size information of the inclusions in a small sample and that of the largest inclusions are correlated with the spectral intensity distribution data of inclusions, obtaining a result of content distribution of the inclusions on the surface of the large size metallic materials.

Abstract: A cell electrode plate feeding device includes a conveying device and a vacuum suction device. The conveying device is configured to convey an electrode plate to be wound and comprises a support base and a conveying body, the support base comprising an accommodating cavity, the conveying body being mounted on the support base, and the conveying body being provided with a communicating portion, by means of which a space of the conveying body on a side away from the accommodating cavity is in communication with the accommodating cavity. The vacuum suction device is in communication with the accommodating cavity, and the vacuum suction device is configured to suck air between a conveying surface of the conveying body and the electrode plate, so as to enable the electrode plate to be attached to the conveying surface of the conveying body.

Abstract: A system and method for controlling a system, comprising estimating an optimal control policy for the system; receiving data representing sequential states and associated trajectories of the system, comprising off-policy states and associated off-policy trajectories; improving the estimate of the optimal control policy by performing at least one approximate value iteration, comprising: estimating a value of operation of the system dependent on the estimated optimal control policy; using a complex return of the received data, biased by the off-policy states, to determine a bound dependent on at least the off-policy trajectories, and using the bound to improve the estimate of the value of operation of the system according to the estimated optimal control policy; and updating the estimate of the optimimal control policy, dependent on the improved estimate of the value of operation of the system.

Abstract: A communication device detection method includes: broadcasting first information by a first communication device, where the first information includes a first identifier (ID) associated with a second communication device and a public key of the first communication device; receiving second information; decrypting the second information by using a private key of the first communication device; and determining that the second communication device is detected in response to determining that the second information is successfully decrypted and a second ID included in the second information has a predetermined corresponding relation with the first ID.

Abstract: Mechanisms for performing intelligent federated machine learning (ML) model updates are provided. A plurality of ML model updates, and a plurality of dataset sketch commitment data structures (sketches), are received from a plurality of participant computing systems. Each sketch provides statistical characteristics of a corresponding local dataset used by a corresponding participant to train a local ML model. A potentially malicious participant identification operation is performed based on an analysis of the plurality of sketches to identify one or more potentially malicious participants based on differences in sketches. ML model updates received from participant computing systems identified as potentially malicious participants are discarded to thereby generate a modified set of updates. The federated ML computer model is updated based on the modified set of updates.

Abstract: Embodiments of the present disclosure provide a ranging method. The method includes: broadcasting a first message, the first message being used to indicate a first public key of the first terminal; receiving a second message sent from a second terminal, the second message being used to indicate a second public key of the second terminal encrypted by the first public key; and sending a third message encrypted by the second public key to the second terminal, the third message being used to indicate a first time difference between a sending time of the first message and a receiving time of the second message.

Abstract: Embodiments of the present disclosure provide an operating system startup method, apparatus and electronic device. A specific implementation of the method comprises: determining at least one target mirror server from a mirror server cluster based on a LinuxBoot on a diskless server, wherein a mirror file stored in a mirror server comprises a system kernel and a file system; downloading mirror file fragments from a target mirror server of the at least one target mirror server based on the LinuxBoot; assembling a plurality of downloaded mirror file fragments into a target mirror file; and booting an operating system of the diskless server based on a target system kernel and a target file system comprised in the target mirror file. Therefore, the efficiency and success rate of diskless boot-up of an operating system of the diskless server can be improved when booting the operating system based on the LinuxBoot.

Abstract: The present disclosure provide a policy coordination method for a group of user equipment (UEs), the method includes receiving a policy request, where the policy request is related to a group policy for the group of UEs; and performing, according to the policy request and pre-stored group policy information, policy coordination on the group of UEs, where the pre-stored group policy information indicates a policy required to be adopted by each UE in the group of UEs for various group policies of the group of UEs.