Abstract: Three-dimensional (3D) memory devices and fabricating methods thereof are disclosed. In certain aspects, a disclosed 3D memory device comprises a first semiconductor structure including a core region, a spacer region, and a periphery region, and a second semiconductor structure including a second periphery circuit on a substrate. The first semiconductor structure comprises a memory stack on a semiconductor layer in the core region, a first periphery circuit on the semiconductor layer in the periphery region, and a spacer structure in the spacer region to separate the memory stack and the first periphery circuit. The second semiconductor structure is connected to the first semiconductor structure.

Abstract: The present invention relates to a SCR catalytic article, comprising —a substrate and —a copper-containing small pore zeolite, having a crystal structure characterized by a decrease of unit cell volume upon sulfurization and desulfurization of less than ?3 as determined by an X-ray powder diffraction, wherein the sulfurization and desulfurization are carried out in accordance with the processes as described in the specification, and to an exhaust treatment system comprising the same. The present invention also relates to a method for determining whether a metal-promoted small pore zeolite is resistant to irreversible sulfur poisoning and a method for evaluating whether a metal-promoted small pore zeolite is qualified for resistance to irreversible sulfur poisoning.

Abstract: The present invention relates to the technical field of mine fire prevention and extinguishing, in particular to a liquid nitrogen direct injection and low-temperature foaming intelligent filling system based on mine fire area characteristics and an application method, comprising a liquid nitrogen storage tank, a liquid nitrogen direct injection system and a low-temperature foaming system, wherein the liquid nitrogen storage tank communicates with a liquid nitrogen pressurizing device through a main pipeline; a temperature control unit is arranged on the main pipeline; and the liquid nitrogen pressurizing device is connected with the liquid nitrogen direct injection system and the low-temperature foaming system, respectively, liquid nitrogen is directly injected into a foam liquid, to prepare a low-temperature foam type fire preventing and extinguishing material by means of forced convection, membrane boiling, explosion boiling and nucleate boiling between the liquid nitrogen and water.

Abstract: This disclosure provides a radiating element, an antenna array, and a network device, to improve polarization self-isolation inside a dipole in an antenna, and improve radiation performance of the antenna. The radiating element includes at least one dipole and a reflection plate, where the at least one dipole is disposed on a surface of the reflection plate; and each of the at least one dipole includes a radiation surface, the radiation surface includes a plurality of metal sheets forming a ring shape, at least two of the metal sheets of the at least one dipole are covered with a metal protrusion structure, and a length of the metal protrusion structure is less than lengths of the covered metal sheets.

Abstract: This application discloses a method for implementing audio and video conference, an audio and video conference system, and a related apparatus. The method includes receiving, by a retrieval device in a first device group, an application to pull data stream from a first interface machine in the first device group, the application to pull data stream comprising first identification information; and forwarding, by the retrieval device in the first device group, the media data stream corresponding to the first identification information to the first interface machine, the first interface machine forwarding the media data stream to the data accessing terminal; the media data stream being obtained by the retrieval device in the first device group from a second interface machine in a second device group, a data generating terminal that generates the media data stream accessing the conference room by using the second interface machine.

Abstract: Embodiments of the present disclosure disclose a live streaming method and system, a server, and a computer storage medium. The method includes: providing, by a first end for information interaction, a first audio/video live stream for a server, and providing, by a second end for information interaction, a second audio/video live stream for the server. The method further includes performing, by the server, coding and processing on the first audio/video live stream and the second audio/video live stream, to obtain a third audio/video live stream, and pushing the third audio/video stream to a third end for information interaction; and receiving, by the third end, audio/video content of the first end and the second end according to the third audio/video live stream.

Abstract: Provided is a multi-functional plugging agent for a coal mine and a preparation method thereof. The preparation method comprises: by taking Ecklonia Kurome Okam as a raw material, mixing an Ecklonia Kurome Okam suspension with phosphorus pentoxide for reaction, then performing biodegradation to obtain an Ecklonia Kurome Okam biological extract, adding urea for neutralization, mixing a neutralization product with an inorganic catalyst and melamine for reaction to obtain a bio-based plugging synergist solution, finally cooling the bio-based plugging synergist solution, and mixing the cooled bio-based plugging synergist solution with a certain amount of pentaerythritol and ammonium polyphosphate to obtain the multi-functional plugging agent for the coal mine based on the Ecklonia Kurome Okam biological extract.

Abstract: Embodiments of the present disclosure disclose a live streaming method and system, a server, and a computer storage medium. The method includes: providing, by a first end for information interaction, a first audio/video live stream for a server, and providing, by a second end for information interaction, a second audio/video live stream for the server. The method further includes performing, by the server, coding and processing on the first audio/video live stream and the second audio/video live stream, to obtain a third audio/video live stream, and pushing the third audio/video stream to a third end for information interaction; and receiving, by the third end, audio/video content of the first end and the second end according to the third audio/video live stream.

Abstract: Accuracy of vital signs monitoring systems depend on the quality of the measurements by the sensors. Crude techniques are applied to discard measurements which have a low signal-to-noise ratio or are saturated. A more accurate and flexible technique enables more measurements to be kept, more meaningful signal quality information to be extracted, more accurate vital signs extraction and more systems to readily embed signal quality assessment in the signal processing pipeline. Improvements include preprocessing of the signal that is independent of variations of underlying hardware, use of features with low computational complexity and high predictive power, cross-channel feature extraction, application of a trained machine learning model, and flexible translation of signal quality classification information into a continuous metric for signal quality.

Abstract: Provided is a multi-functional plugging agent for a coal mine and a preparation method thereof. The preparation method comprises: by taking Ecklonia Kurome Okam as a raw material, mixing an Ecklonia Kurome Okam suspension with phosphorus pentoxide for reaction, then performing biodegradation to obtain an Ecklonia Kurome Okam biological extract, adding urea for neutralization, mixing a neutralization product with an inorganic catalyst and melamine for reaction to obtain a bio-based plugging synergist solution, finally cooling the bio-based plugging synergist solution, and mixing the cooled bio-based plugging synergist solution with a certain amount of pentaerythritol and ammonium polyphosphate to obtain the multi-functional plugging agent for the coal mine based on the Ecklonia Kurome Okam biological extract.

Abstract: System and apparatus for pulse oximetry. Systems, methods, and devices are presented for placement of the hardware on a body part where detracting signals are strong. In one example, detracting signals include signals from respiration. In various examples, the body part the oximeter is placed on is a wrist, chest, or arm. A computationally efficient pipeline is presented that allows for reliable and robust SpO2 estimation.

Abstract: Embodiments of the present disclosure disclose a live streaming method and system, a server, and a computer storage medium. The method includes: providing, by a first end for information interaction, a first audio/video live stream for a server, and providing, by a second end for information interaction, a second audio/video live stream for the server. The method further includes performing, by the server, coding and processing on the first audio/video live stream and the second audio/video live stream, to obtain a third audio/video live stream, and pushing the third audio/video stream to a third end for information interaction; and receiving, by the third end, audio/video content of the first end and the second end according to the third audio/video live stream.

Abstract: Embodiments of the present disclosure disclose a live streaming method and system, a server, and a computer storage medium. The method includes: providing, by a first end for information interaction, a first audio/video live stream for a server, and providing, by a second end for information interaction, a second audio/video live stream for the server. The method further includes performing, by the server, coding and processing on the first audio/video live stream and the second audio/video live stream, to obtain a third audio/video live stream, and pushing the third audio/video stream to a third end for information interaction; and receiving, by the third end, audio/video content of the first end and the second end according to the third audio/video live stream.

Abstract: This application discloses a method and an apparatus for multimedia communication. A session page is loaded by using a browser kernel integrated in a local client, and a script on the session page is executed by using the browser kernel, to perform the following operations: exchanging a control parameter with a peer client by using a signaling server; establishing a data channel between the local client and the peer client; collecting multimedia data and transmitting the multimedia data to the peer client through the data channel, so that the peer client plays the multimedia data by using a media stream parameter of the local client; and receiving, through the data channel, the multimedia data collected by the peer client, and playing the multimedia data on the session page according to a media stream parameter of the peer client. In this way, cross-client multimedia communication is implemented.

Abstract: A plastic gel material for preventing spontaneous combustion of coal, including water, a crosslinking agent, a toughener, a coagulant, an aggregate and a water glass. The crosslinking agent (AlCit) is prepared by mixing a polyaluminum chloride solution and a citric acid solution then neutralizing the mixture with a sodium hydroxide solution. The coagulant is one or more of potassium bicarbonate, sodium bicarbonate, ammonium bicarbonate, sodium carbonate or glucono-?-lactone (GDL). The toughener is one or more of pregelatinized starch, sodium alginate, carboxymethyl cellulose or polyacrylamide. The aggregate is coal ash or bentonite. The plastic gel has good water retention, toughness and inhibition performance, and helps avoid easy cracking and pulverization in inorganic silica gel consolidating bodies after losing water. The plastic gel can cover the surface of burning coal mass, reduce the temperature of the ignition source, heat radiation and production amount of CO, and have a fire extinguishing effect.

Abstract: A microcapsule of sustainable self-healing coal mine ventilation sealing material crack. The microcapsule includes a microcapsule core material and a microcapsule wall material. The microcapsule core material is prepared using a bacterial lyophilized powder and a substrate. By using urease-producing bacteria, there is provided a method of protecting bacteria to survive a long time in the cement-based material, supplying sufficient nutrient substances and reducing the impact of the doping of bacteria on the mechanical property of the cement-based material. The bacterial lyophilized powder and substrate are prepared into microcapsules which are added into the cement-based material when the cement-based material is mixed. In this case, once concrete cracks, the microcapsules breaks and the spores in the material are activated to perform normal metabolism so as to induce precipitation of calcium carbonate continuously, thereby continuously realizing self-healing of coal mine ventilation sealing material cracks.

Abstract: One embodiment is a method comprising collecting photoplethysmography (“PPG”) data associated with a user using a biometric monitoring device; extracting a signal quality metric (“SQM”) from the collected PPG data; classifying the PPG data signal based on the extracted SQM into one of a plurality of signal quality levels; and determining based on the classification whether to increase, decrease, or maintain a power level of an LED of the biometric monitoring device.

Abstract: The present disclosure discloses a method, an apparatus, and a system for providing a specified communications service, and a terminal, and belongs to the field of network technologies. The method includes: sending a specified communications service request to a signaling access server, the specified communications service request carrying a third-party application identifier and a first user identity of a local end, and the signaling access server being configured to provide a specified communications access service; if verification on the third-party application identifier and the first user identity is successful, establishing a signaling path to the signaling access server, the signaling path being configured to provide a signaling transmission interface to the signaling access server; and performing specified communication based on the signaling path.

Abstract: A method, system and server for pushing information are disclosed in the embodiments of the present invention. In the method, corresponding to position information, the server presets contacts used for pushing information as communication robots. The method comprises: receiving, by the server, a nearby contact search request from a client, wherein the search request includes current position information of the client; searching the contacts nearby the current position included in the information; returning the searched contacts to the client, wherein the searched contacts includes communication robots; receiving, by the server, a query request from the client for querying the communication robots, obtaining recommendation information corresponding to the query request and pushing the recommendation information to the client.

Abstract: This application discloses a method and an apparatus for multimedia communication. A session page is loaded by using a browser kernel integrated in a local client, and a script on the session page is executed by using the browser kernel, to perform the following operations: exchanging a control parameter with a peer client by using a signaling server; establishing a data channel between the local client and the peer client; collecting multimedia data and transmitting the multimedia data to the peer client through the data channel, so that the peer client plays the multimedia data by using a media stream parameter of the local client; and receiving, through the data channel, the multimedia data collected by the peer client, and playing the multimedia data on the session page according to a media stream parameter of the peer client. In this way, cross-client multimedia communication is implemented.