Abstract: A key-value engine may perform garbage collection for a tree or hierarchical data structure on an append-only storage device with page mappings. The key-value engine may separate hot and cold data to reduce write amplification, track extent usage using a restricted or limited amount of memory, efficiently answer queries of valid extent usage, and adaptively or selectively defragment pages in snapshots in rounds of garbage collection.

Abstract: An atomizer for adaptively generating pharmaceutical aerosols of different particle sizes is illustrated, which comprises a sensor module, a waveform pattern determination module, a high-frequency oscillation circuit, a signal modulation module, a piezoelectric device and a porous screen. The sensor module senses a body state of the patient, wherein the body state includes a breathing state. The waveform pattern determination module generates a modulation control signal according to the body state. The high-frequency oscillation circuit provides a high-frequency oscillation signal. The signal modulation module modulates the high-frequency oscillation signal by using the modulation control signal to generate a vibration signal. The piezoelectric device vibrates according to the vibration signal. According to vibration of the piezoelectric device, the porous screen presses the liquid medicine through a plurality of holes of the porous screen to generate a plurality of pharmaceutical aerosols.

Abstract: An optical imaging lens system includes five lens elements which are, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element has positive refractive power. The second lens element has negative refractive power. The third lens element has positive refractive power. The fourth lens element has negative refractive power. The fifth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof.

Abstract: The present invention provides a method for OSA (Obstructive Sleep Apnea) severity classification by using recording-based Peripheral Oxygen Saturation Signal. The major feature of the present invention emphasizes on using a recording-based Peripheral Oxygen Saturation Signal (SpO2 signal) as an input, which is different from the deep learning-based prior art of using segment-based signals as an input to a model, and the segment-based signals has only two classification results, i.e. normal or apnea.

Abstract: The present invention provides a method for OSA (Obstructive Sleep Apnea) severity detection using recording-based electrocardiography (ECG) Signal. The major feature of the present invention emphasizes on using a recording-based ECG Signal as an input, which is different from the deep learning-based prior art of using segment-based signals as an input to a model, and the segment-based signals has only two classification results, i.e. normal or apnea. The present invention provides a method for a model to detect and output directly a value of apnea-hypopnea index (AHI) for the OSA Severity.

Abstract: A photographing optical lens assembly includes seven lens elements, which are, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The second lens element has positive refractive power. The sixth lens element with positive refractive power has an image-side surface being convex in a paraxial region thereof. The seventh lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof and including at least one convex critical point in an off-axis region thereof.

Abstract: An optical lens assembly includes seven lens elements which are, in order from object side to image side: first lens element, second lens element, third lens element, fourth lens element, fifth lens element, sixth lens element and seventh lens element. The first lens element has object-side surface having at least one convex shape in off-axis region thereof. The second lens element with positive refractive power has object-side surface being convex in paraxial region thereof. The third lens element has image-side surface being convex in paraxial region thereof. The sixth lens element with positive refractive power has object-side surface being convex in paraxial region thereof. The seventh lens element has image-side surface being concave in paraxial region thereof, and the image-side surface of the seventh lens element has at least one convex critical point in off-axis region thereof. The optical lens assembly has a total of seven lens elements.

Abstract: A key-value engine of a storage system may perform a restart recovery after a system failure. The key-value engine may read a metadata log to locate a latest system checkpoint, and load a page mapping table from the latest system checkpoint. The key-value engine may replay to apply changes to the page mapping table from a system transaction log starting from a system transaction replay starting point. The key-value engine may further form one or more read-only replicas using an underlying file stream opened in a read-only mode during the recovery after the system failure to further facilitate fast recovery and provide fast response to user transactions that conduct read only transactions after the system failure.

Abstract: A voice question and answer method and device, a computer readable storage medium, and an electronic device are described. The method comprises: receiving question voice information, and obtaining question text information according to the question voice information; performing at least one of general semantic analysis processing and dedicated semantic analysis processing on the question text information to generate an analysis result; and obtaining answer information according to the analysis result. The general semantic analysis is used for semantic analysis in the general field, and the dedicated semantic analysis is used for semantic analysis in the art field.

Abstract: An electrode and system for electrocatalytic water splitting. The electrode for overall water splitting comprises a conductive substrate, and a bifunctional electrocatalyst comprising primarily metallic phosphides disposed on a surface of the substrate. The system comprises an anode and a cathode. Each of the anode and the cathode comprises a uniform distribution of a bifunctional electrocatalyst comprising metallic phosphides on a conductive substrate. The metallic phosphides can comprise iron phosphide (FeP) and dinickel phosphide (Ni2P). The bifunctional electrocatalyst promotes hydrogen evolution reaction (HER) at the cathode, and oxygen evolution reaction (OER) at the anode.

Abstract: Systems and methods discussed herein, based on a key-value data store including multiple-tiered sorted data structures in memory and storage, implement granularly timestamped concurrency control. The multiple-tiering of the key-value data store enables resolving the snapshot queries by returning data record(s) according to granularly timestamped snapshot lookup instead of singularly indexed snapshot lookup. Queries return a merged collection of records including updates from data structures in memory and in storage, such that a persistent storage transaction may refer to non-committed updates up to a timeframe defined by the snapshot read timestamp. This way, inconsistency is avoided that would result from merely reading data records committed in storage, without regard as to pending, non-committed updates thereto.

Abstract: The present disclosure provides a high-pressure common rail fuel injector capable of achieving highly stable injection based on the throttling damping-accommodating effect in the present disclosure, comprising a fuel injector housing, a fuel pipe connector, an accumulator chamber, a fuel chamber control valve, a pressure fluctuation absorption assembly, a control valve assembly and a nozzle assembly; the accumulator chamber is installed in the fuel injector housing, and the fuel pipe connector is installed above the accumulator chamber; the fuel chamber control valve, the pressure fluctuation absorption assembly and the control valve assembly are installed in the fuel injector housing, and the nozzle assembly is arranged below the control valve assembly; and the accumulator chamber is separated into a main accumulator chamber, an auxiliary accumulator chamber and a fuel-return accumulator chamber.

Abstract: The present invention provides a caption service system for remote speech recognition, which provides caption service for the hearing impaired. This system includes a speaker and a live broadcast equipment at A, a listener-typist and a computer at B, a hearing impaired and a live screen at C, and an automatic speech recognition (ASR) caption server at D. Connect the live broadcast equipment, the computer, the live screen and the ASR caption server with a network. The speaker's audio is sent to the automatic speech recognition (ASR) caption server to be converted into text, which is corrected by the listener-typist, and then the text caption is sent to the live screen of the hearing impaired together with the speaker's video and audio, so that the hearing impaired can see the text caption spoken by the speaker.

Abstract: This application provides a data transmission method. The method includes: An electronic device first establishes an MPTCP connection to an application server, where the MPTCP connection includes two TCP connections. Then, the electronic device receives indication information from an application server, where the indication information includes a type identifier and a parameter. When the type identifier indicates a low data transmission delay requirement, the electronic device receives, in a first time period after the electronic device receives the indication information, the data stream by using a first TCP connection. When an accumulated data amount actually received by the electronic device in the first time period is less than a product of the parameter and duration corresponding to the first time period, the electronic device receives the data stream in a second time period by using both the two TCP connections.

Abstract: A method of electrocatalytic water splitting by providing an anode and a cathode; and utilizing the anode and the cathode for alkaline water electrolysis. Each of the anode and the cathode comprises a uniform distribution of a bifunctional electrocatalyst comprising metallic phosphides on a conductive substrate. The metallic phosphides comprise arion phosphide (FeP) and dinickel phosphide (Ni2P). The bifunctional electrocatalyst promotes hydrogen evolution reaction (HER) at the cathode, and oxygen evolution reaction (OER) at the anode.

Abstract: The present disclosure provides a high-pressure common rail fuel injector capable of achieving highly stable injection based on the throttling damping-accommodating effect in the present disclosure, comprising a fuel injector housing, a fuel pipe connector, an accumulator chamber, a fuel chamber control valve, a pressure fluctuation absorption assembly, a control valve assembly and a nozzle assembly; the accumulator chamber is installed in the fuel injector housing, and the fuel pipe connector is installed above the accumulator chamber; the fuel chamber control valve, the pressure fluctuation absorption assembly and the control valve assembly are installed in the fuel injector housing, and the nozzle assembly is arranged below the control valve assembly; and the accumulator chamber is separated into a main accumulator chamber, an auxiliary accumulator chamber and a fuel-return accumulator chamber.

Abstract: An optical lens assembly includes seven lens elements which are, in order from object side to image side: first lens element, second lens element, third lens element, fourth lens element, fifth lens element, sixth lens element and seventh lens element. The first lens element has object-side surface having at least one convex shape in off-axis region thereof. The second lens element with positive refractive power has object-side surface being convex in paraxial region thereof. The third lens element has image-side surface being convex in paraxial region thereof. The sixth lens element with positive refractive power has object-side surface being convex in paraxial region thereof. The seventh lens element has image-side surface being concave in paraxial region thereof, and the image-side surface of the seventh lens element has at least one convex critical point in off-axis region thereof. The optical lens assembly has a total of seven lens elements.

Abstract: The invention, belonging to the field of membrane technology, presents a method for the direct growth of ultrathin porous graphene separation membranes. Etching agent, organic solvent and polymer are coated on metal foil, and then they are calcined at high temperature in absence of oxygen; after removal of metal substrate and reaction products, single-layered or multi-layered porous graphene membranes are obtained. Alternatively, the dispersion or solution of etching agent is coated on metal foil, on which a polymer film is then overlaid. The obtained sample is subsequently calcined at high temperature in absence of oxygen; after removal of metal substrate and reaction products, single-layered or multi-layered porous graphene membranes are obtained. The method involved in this invention is simple and highly efficient, and allows direct growth of ultrathin porous graphene separation membranes, without needing expensive apparatuses, chemicals and graphene raw material.

Abstract: An aspect of the present disclosure provides time and energy-efficient synthesis of catalysts for water electrolysis. An exemplary synthesis method includes dissolving amounts of Fe(NO3)3.9H2O and Na2S2O3.5H2O in deionized water at ambient temperature to form a solution, placing Ni foam into the solution where the Ni foam serves as a substrate and a Ni source for growth of sulfur-doped (Ni,Fe)OOH (S—(Ni,Fe)OOH) catalysts, leaving the Ni foam in the solution at ambient temperature for a duration between one minute and five minutes to provide a treated foam where the S—(Ni,Fe)OOH catalysts grow on the substrate during the duration, and removing the treated foam from the solution after the duration.

Abstract: An electronic device includes at least one optical lens assembly. The optical lens assembly includes four lens elements, and the four lens elements are, in order from an outside to an inside, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has an outside surface being convex in a paraxial region thereof. The second lens element has an inside surface being convex in a paraxial region thereof. The fourth lens element has an inside surface being concave in a paraxial region thereof, wherein at least one of an outside surface and the inside surface of the fourth lens element includes at least one critical point in an off-axis region thereof.