Abstract: The embodiments of the present disclosure provide a method and an Internet of Things (IoT) system for operation and management of a smart gas data center. The method is implemented by a smart gas management platform, comprising: obtaining gas data to be stored and downstream user features corresponding to the gas data to be stored; determining a data redundancy level of the gas data to be stored based on the gas data to be stored and the downstream user features; generating redundant data blocks of the gas data to be stored based on the data redundancy level; and storing the gas data to be stored and the redundant data blocks in at least one target region of the smart gas data center.

Abstract: The embodiments of the present disclosure provide methods and systems for energy measuring based on natural gas data of a smart gas meter, including establishing the gas IoT. The object platform obtains consumed gas volume data and location data of the smart gas meter as first data and second data, and sending them to the management platform through the sensor network platform. The management platform generates consumed gas preprocessing data based on the first data and the second data, and generates energy measurement data after performing the computation outside the gas IoT on the consumed gas preprocessing data by the cloud platform outside the gas IoT. The management platform sends the energy measurement data to the user platform configured in a regional pipeline network center through the service platform. The user platform performs gas energy measurement of the smart gas meter based on the energy measurement data.

Abstract: A Helmholtz resonator and a low-frequency broadband sound-absorbing and noise-reducing structure based on the same is provided. The Helmholtz resonator includes a Helmholtz resonator body, at least one embedded tube is disposed in the Helmholtz resonator body, and an inner surface of an opening of the Helmholtz resonator body wraps around an outer side of one of the embedded tubes; and all the embedded tubes are not in contact with each other. The low-frequency broadband sound-absorbing and noise-reducing structure includes a rigid framework, and at least two Helmholtz resonators are disposed in parallel in the framework. The Helmholtz resonator not only achieves a better low-frequency broadband sound absorption and noise reduction effect, but also reduces a thickness of the Helmholtz resonator more effectively.

Abstract: A plant sterility-related gene is disclosed, in particular to a dominant male sterility-related gene from rice and application of an encoding protein thereof in creating a rice dominant male sterile line. The present invention provides a rice dominant male sterile gene SMS and application thereof. The rice dominant male sterility-related gene SMS may be used for creating a new dominant male sterile line, thereby strengthening use of the advantages of a rice hybrid. The TO generation of transgenic plant line with overexpression of the rice dominant male sterility related gene SMS shows pollen abortion or no pollen, which indicates that the transgenic plant overexpressing this gene can obtain a new sterile material. Creation of the dominant male sterile line can promote wide application of a recurrent selection breeding method, enrich the genetic diversity of a new breeding variety, and solve the problem of a single variety of the rice.

Abstract: The present disclosure provides an ultra-high temperature resistant cement slurry system for cementing and the preparation method and use thereof. The cement slurry system comprises cement, an ultra-high temperature strength stabilizer, an ultra-high temperature reinforcing material, a density regulator, an ultra-high temperature suspension stabilizer, a dispersant, a fluid loss additive, a retarder, a defoaming agent and water, wherein the ultra-high temperature suspension stabilizer comprises an ether-based starch, an aluminosilicate and a polyalcohol polymer. The method for preparing the cement slurry system includes dry mixing and wet mixing raw materials homogeneously, respectively, and then homogeneously mixing the dry mix and wet mix to obtain the cement slurry system. The present disclosure further provides use of the cement slurry system for cementing in deep wells and ultra-deep wells at high and ultra-high temperatures.

Abstract: The present disclosure discloses a prelithiation reagent for a lithium-ion battery (LIB), and a preparation method therefor and use thereof. The prelithiation reagent for the LIB has a chemical formula of Li5FeO4@C; and the prelithiation reagent for the LIB has a structure of secondary particles generated from the agglomeration of Li5FeO4 primary particles, and carbon is coated on a surface of the Li5FeO4 primary particles. In the present disclosure, a carbon source is mixed with a soluble salt of Fe, such that Fe ions are attached to the carbon source; then aqueous ammonia is added, such that a hydroxide with small particles and high dispersibility is generated; and then a solvothermal reaction is conducted to obtain a nano-scale oxide.

Abstract: Disclosed is a municipal sewage nitrogen removal treatment device, comprising a reaction pool. A water inlet pipeline, a water outlet pipeline and a reflux pipeline are connected to the reaction pool, and the reflux pipeline communicates with the water inlet pipeline by using a reflux element. A surface aerator is arranged in the reaction pool. The reaction pool comprises a reaction zone and a settling zone, the settling zone is located at the bottom of the reaction zone, and the reaction zone is provided with a flow deflector. The flow deflector is provided with a plurality of flow deflecting channels, the sidewall of the flow deflecting channel is a rough surface, and microorganisms in the reaction pool are able to attach to the sidewall of the flow deflecting channel. The present disclosure further provides a treatment method using the municipal sewage nitrogen removal treatment device above.

Abstract: A signal delay method, including: generating a target spatial filter according to received indication information, where the indication information is used to indicate a coefficient of M spatial filters, and M is an integer greater than 1; and relaying a signal between a first network element and a second network element through the target spatial filter.

Abstract: Cleaning tools for cleaning the pull cable of an ingot puller apparatus and methods for cleaning the pull cable are disclosed. The cleaning tool includes a chamber for receiving the pull cable. Pressurized fluid is discharged through one or more nozzles to detach debris from the pull cable. The fluid and debris are collected in an exhaust plenum of the cleaning tool and are expelled through an exhaust tube. The cleaning tool includes one or more guides that guide the cleaning tool in an upper segment of the ingot puller apparatus.

Abstract: A DNA methylation profile of a few of trophectoderm cells in a blastocyst is detected, and the average methylation 5 level and the methylation pattern of embryos identified as having a good morphology in Gardner morphological blastocyst grading process are used as the standard for screening for well-developed blastocysts. The nearer the methylation level of the trophectoderm cells of the blastocyst to be tested approaches the methylation level or state of the good embryo, the better the embryo development is and the higher the 10 suitability for being implanted into a maternal subject is.

Abstract: A preparation method comprises the following steps: (1) in a protective atmosphere, mixing a graphite powder with a metal peroxide and/or alkali metal superoxide, and leaving same to stand to obtain a mixed graphite-metal peroxide and/or graphite-alkali metal superoxide composite material; (2) putting the composite material prepared in step (1) into a liquid medium, which can react with the metal peroxide and/or the alkali metal superoxide, for a reaction to obtain intercalated graphite; and (3) heating the intercalated graphite prepared in step (2) to prepare the expanded graphite. The preparation method can effectively avoid the generation of harmful impurities such as sulfur and sulfides during the preparation process of the expanded graphite, thereby reducing environmental pollution.

Abstract: The disclosure provides a catenary icing detection method based on infrared imaging and meteorological monitoring. In the disclosure, infrared illumination is used to detect the target, real-time images of the target are obtained through an infrared imaging sensor, and meteorological data are synchronously obtained through a meteorological monitoring unit, and normalized fusion processing is performed; the data are stored in a front-end edge computing unit, and through the deep learning model, the states of water accumulation, snow accumulation and icing of the target are automatically identified, and then sent to a background system through a transmission unit.

Abstract: Embodiments of this application disclose a noise reduction headset. A branch pipe is disposed in the headset to connect a sound cavity inside the headset and an external environment. The branch pipe has a low-pass filter function to filter out high-band noise entering the sound cavity from the external environment, so that impact on sound quality inside the sound cavity that is caused by noise in the external environment is reduced, thereby implementing passive noise reduction.

Abstract: A video processing method, apparatus, and device and a storage medium are provided. The method includes: monitoring an operation indication inputted by a user through a personal homepage on a social platform, the personal homepage being used for displaying personal information of the user; obtaining, when the operation indication is a shooting indication for shooting a personal status video, the personal status video; uploading the personal status video to a back-end server of the social platform; and displaying indication information of the personal status video in a personal-information display region of the personal homepage.

Abstract: The embodiments of the present disclosure provide a method for recommending a parking lot in a smart city and an Internet of Things system, implemented based on a management platform of an Internet of Things system for recommending a parking lot in a smart city. The method includes: determining an arrival duration of a user reaching at least one candidate parking lot and a prediction time period corresponding to each candidate parking lot in the at least one candidate parking lot based on a user request; determining an occupation rate of the candidate parking lot during the prediction time period; and determining a recommended parking lot at least based on the occupation rate of the candidate parking lot during the prediction time period and parking lot information of the candidate parking lot.

Abstract: A counter substrate is provided. The counter substrate includes a bank layer on a base substrate and defining a plurality of bank apertures; a quantum dots material layer on the base substrate, the quantum dots material layer including a plurality of quantum dots blocks respectively in at least some of the plurality of bank apertures; and a support layer on a side of the quantum dots material layer and the bank layer away from the base substrate. The support layer includes one or more support portions, orthographic projections of which on the base substrate adjacent to a periphery of an orthographic projection of a respective one of the plurality of bank apertures on the base substrate. An orthographic projection of the bank layer on the base substrate at least partially overlaps with an orthographic projection of the support layer on the base substrate.

Abstract: The present disclosure provides a reinforcing part for a speaker diaphragm, the reinforcing part being an overlapped multilayer structure, the reinforcing part includes a heat dissipation layer as well as a first support layer and a second support layer that are fixed and bonded on surfaces of two sides of the heat dissipation layer respectively, and the first support layer and the second support layer each includes through holes penetrating the surfaces of two sides thereof, and the reinforcing part further includes fillers located within the through holes and configured for heat conduction, the fillers having thermal conductivity higher than that of the support layers.

Abstract: A modular spring bias cavity device which includes a base and side external walls extending from the base. A cover fits over the side external walls. A support structure has a support structure first cavity. The support structure is mounted to the base. A suspension frame has a first suspension frame cavity that fits over the support structure first cavity. The suspension frame is formed as a resilient and flexible structure. A suspension frame overlap extends downwardly at a periphery of the extension frame. The suspension frame overlap overlaps the support structure. A channel frame is mounted to the support structure around a support structure sidewall. The channel frame fits within a channel formed between the suspension frame overlap and the support structure.

Abstract: The present disclosure provides a method and apparatus for DBNG-UP redundancy. The method includes: configuring a redundancy group instance on a DBNG-CP, wherein redundancy group members managed by the DBNG-CP at least include a first DBNG-UP and a second DBNG-UP; and performing, by the DBNG-CP, UP redundancy capability negotiation with the first DBNG-UP and the second DBNG-UP respectively, to complete active/standby election between the first DBNG-UP and the second DBNG-UP. In the present disclosure, a DBNG-CP performs UP redundancy capability negotiation with DBNG-UPs managed by the DBNG-CP, so as to complete active/standby election of the DBNG-UP, thereby solving the problem of UP redundancy capability negotiation, and increasing the flexibility of DBNG-UP redundancy protection.