Abstract: The present disclosure discloses a preparation method of an aluminum nitride (AlN) composite structure based on a two-dimensional (2D) crystal transition layer. The preparation method of the present disclosure includes: transferring the 2D crystal transition layer on a first periodic groove of an epitaxial substrate; forming a second periodic groove staggered with the first periodic groove on the 2D crystal transition layer; depositing a supporting protective layer; depositing a functional layer of a required AlN-based material; and removing the 2D crystal transition layer through thermal oxidation to obtain a semi-suspended AlN composite structure. The preparation method of the present disclosure has low difficulty and is suitable for large-scale industrial production.

Abstract: A method for allocating resource and accessing in open wireless channels includes: covering multiple types of user terminal stations in open wireless channels; making dynamic adaptive matching according to comprehensive change factors of a transmitting end and a receiving end in each communication process. The factors of the transmitting end mean that a type and transmitting capacity of a transmitting station are changed, a current state of the wireless channel between the transmitting station and a relay node is changed, a working state of a receiving end of the relay node is changed, and user services to be transmitted are changed; the factors of the receiving end mean that a type and receiving capacity of a receiving station are changed, a current state of the channel from the relay node to the receiving station is changed, and a working state of a transmitting end of the relay node is changed.

Abstract: The present disclosure provides a compound function prediction method based on a neural network and a connectivity map (CMAP) algorithm. The compound function prediction method is used to predict an efficacy of a compound, and the compound function prediction method includes the following steps: constructing a compound molecule—encoding vector neural network; constructing and training an encoding vector—marker gene expression variation deep neural network; constructing and training a marker gene expression level or gene expression variation—whole genome gene expression level or gene expression variation neural network; constructing upregulated and downregulated gene sets of a disease or a phenotype; and evaluating a correlation between the compound and the disease or the phenotype.

Abstract: A quantitative source apportionment method based on nontarget high-resolution mass spectrometry (HRMS) data of pollution sources and pollution receptors includes: acquiring samples of pollution sources and receptors, pre-processing samples to extract trace organic pollutants; acquiring chromatography-HRMS nontarget data; pre-processing raw data to obtain a HRMS dataset including a mass-to-charge ratio, a retention time, and a peak area; determining a source-sink relationship based on positions of pollution sources and receptors; constructing an input matrix by combining the HRMS dataset and using each sink as a group; adopting an expectation-maximization method or a Bayesian method to calculate contribution of each source based on a standardized input matrix. Beneficial effects at least include the follows.

Abstract: A device and method for preparing a thermosetting bonded magnet are provided, the device includes a compressed air glue feeding tank and a composite-function mold. A feeding end of the compressed air glue feeding tank is connected to the composite-function mold. The composite-function mold includes a housing, the housing is disposed at an upper end and a lower end of the composite-function mold, and the housing includes a polytetrafluoroethylene upper cover and a polytetrafluoroethylene lower cover; the polytetrafluoroethylene upper cover and the polytetrafluoroethylene lower cover are respectively disposed at the upper end and the lower end of composite-function mold. The method uses a silica gel material as a binder for anisotropic magnets, and the selected raw materials and process are suitable for quickly obtaining a uniform magnet slurry. The curing process is controllable, and there is no organic solvent or heating during the mixing process.

Abstract: Disclosed by the present application are a system and method for multi-device media data management, and a robot device. A detection module detects a device located within a detection range, and determines according to a detection result whether to add the device to a device management list. A storage module obtains media data generated by each device in the device management list and stores the media data in a backup system in association with a corresponding tag. An instruction module receives an instruction of a user and analyzes the content of the instruction, the content comprising a tag and management type corresponding to the media data. A management module performs a management operation on corresponding media data according to the analyzed content.

Abstract: A natural gas separation and purification and mercury collection system for oil and gas wells includes a cyclone separator, a condensation purification and separation mechanism, pressure buffer mechanisms, mercury collection and separation mechanisms, and natural gas storage tanks. An inlet end of the cyclone separator is communicated with an external gas source through a pressure buffer mechanism, and an outlet end of the cyclone separator is communicated with the condensation purification and separation mechanism through a pressure buffer mechanism. The condensation purification and separation mechanism is communicated with the mercury collection and separation mechanism through a pressure buffer mechanism. The mercury collection and separation mechanism is communicated with the natural gas storage tank through a guide tube. A method of use of the natural gas separation and purification and mercury collection system includes gas collection, gas purification, mercury separation, and mercury analysis.

Abstract: Embodiments of the present disclosure provide a method and device for selecting a context model of a quantized coefficient end flag. The method comprises: obtaining a scanning position POS of a non-zero coefficient corresponding to current quantized coefficient end flag in a specific scanning order; wherein the scanning position POS is a subscript of the non-zero coefficient in the scanning order; configuring a first context model array, and using a fixed value as the base to calculate the logarithmic value of the value of the scanning position POS plus 1, and according to the logarithmic value, selecting a first context model from the first context model array; and using the first context model to encode or decode a binary symbol of the current quantized coefficient end flag. According to the technical solution of the present application, it is able to improve encoding and decoding efficiency for a quantized coefficient end flag, thereby further improve the efficiency of video encoding and decoding.

Abstract: Disclosed are a method for preparing a carboxyl cyclic acid anhydride and a prepared product thereof. The disclosed method includes the steps of reacting a compound of formula (I) with a cyclization reagent to produce the compound of formula (II) and an acid, and using an epoxy compound as an acid scavenger. The disclosed method is low in cost, and has low requirements for reagents, places and equipment required for experiments, mild conditions, a wide application range of substrates and a high tolerance of functional groups. The synthesis route can recycle some solvents and other high value-added by-products, with less waste liquid discharge and easy amplification. It also has extremely high industrial and academic value, and can greatly promote the rapid mass production and application of products such as polyamino acid, polyhydroxy acid (polyester), and polymercaptic acid (polysulfide).

Abstract: An organic field-effect transistor and a fabrication method therefor, including: providing a gate; depositing polymer material onto the gate to form a dielectric layer; performing supercritical fluids treatment on the gate having the dielectric layer deposited; depositing organic semiconductor layer material on the dielectric layer having been processed, to form an organic semiconductor layer; depositing electrode layer material on the organic semiconductor layer and forming an electrode layer. The dielectric properties of the dielectric layer after adopting the supercritical fluids treatment have been significantly improved. While the hysteresis effect of the dielectric layers in the OFET devices has been basically eliminated, the sub-threshold slope of the OFET is also significantly reduced, the carrier mobility is effectively improved. Additionally, an OFET switching rate after being processed is improved, and, by connecting the LEDs in series, the switching rate of the LED is increased.

Abstract: The present invention relates to the field of tumor grade detection. Specifically disclosed are a gene combination for human tumor grading, and a use thereof. The gene combination for human tumor grading consists of a gene set A and a gene fragment set B. The gene combination for human tumor grading is obtained from high-throughput sequencing data of an actual renal cancer case of the Peking University First Hospital by means of specific pairing and clustering, is derived from real data, and can be used for malignancy degree grading and prognosis prediction for renal cancer and pan-cancer.

Abstract: The present disclosure provides a method for improving stability of an electrochemical sensor. The method includes the following steps: S1, manufacturing an electrochemical sensor; S2, immobilizing a biosensitive molecular enzyme on a working electrode of the electrochemical sensor; S3, setting a immobilization agent on a surface of the biosensitive molecular enzyme; and S4, adding a protective film on a surface of the immobilization agent, such that the protective film is deposited on the working electrode to improve the stability of the electrochemical sensor. In the present disclosure, glutaraldehyde (GA), polyvinyl alcohol (PVA), and polyethylene glycol (PEG), or polyaniline (PANI), the GA, the PVA, the PEG, and polyurethane (PU) are arranged on a surface of the biosensitive molecular enzyme. Therefore, the surface of the biosensitive molecular enzyme forms a composite protective film, which reduces a probability of direct exposure of an enzyme layer to the air.

Abstract: Disclosed are a GaN power device and a manufacturing method thereof. The GaN power device includes a substrate, and a buffer layer, a GaN channel layer and a barrier layer sequentially stacked on the substrate from bottom to top. The barrier layer is provided with a p-GaN cap layer and a p-GaN thin layer, and the p-GaN thin layer is configured to cover the surface of the barrier layer and is connected to the p-GaN cap layer; the upper surface of the barrier layer is also provided with an input electrode and an output electrode, and a control electrode is provided on the upper surface of the p-GaN cap layer. The control electrode and the p-GaN thin layer are located between the input electrode and the output electrode.

Abstract: A flexible peristaltic robot with a built-in bidirectional gas pump for self-regulating gas flow. The robot includes a head-end airbag, an extension-retraction airbag, a tail-end airbag, a power module, a control module and a bidirectional gas pump. When there is harmful gas or less gas in the external environment, an additional airbag is provided in the flexible peristaltic robot to form a closed internal circulation of air flow. Otherwise, the robot directly exchanges gas with the external environment to form an open external circulation of air flow. The flexible peristaltic robot can either use multiple bidirectional air pumps or use a single bidirectional air pump and multiple electrically-controlled switches to control the expansion and contraction of the airbags to enable the robot to move forward.

Abstract: An embodiment of the present description provides a decoding method and device for a quantization block as well as an electronic device.

Abstract: RVDs with recognition preferences for 5mC, 5hmC and 6 mA and different binding properties to these epigenetic modifications are identified in this present invention. Methylation-dependent gene activation, efficient genome editing, targeted detection of 5hmC and other applications can be achieved by using these RVDs. The present invention therefore provides an isolated DNA binding polypeptide containing TALEs, a fusion protein, a polynucleotide, a vector comprising the polynucleotide and a host cell, and the use of the protein comprising TALE repeats domain in the preparation of a reagent for detecting a methylated base in a target sequence of a gene of interest, as well as a method for targeting and binding to a target sequence of a gene of interest in a cell.

Abstract: A method for piloting from bypass in a network with open wireless channels is disclosed. The method includes: 1) selecting a terminal station as a reference in open wireless channels, and sending a pilot signal, in which all or some frequency bands of open wireless channels occupied by the pilot signal are pilot frequency bands, and the proportion of power of the pilot signal to the total power of the pilot frequency bands is 0.1‰-5%; 2) spreading the pilot signal with a spread spectrum code when it is transmitted, and then superimposing on a communication signal in the pilot frequency bands in a low power spectrum signal mode similar with noise; and 3) providing pilot, carrier wave and clock synchronization, standard timing and indication information for network construction and mutual communication of multiple types of terminal stations in channels by the pilot signal.

Abstract: A self-adaptive point cloud stripe division method. The method comprises: firstly, carrying out space division with a certain depth on a point cloud to obtain a plurality of local point clouds; then, counting the number of points in each of the local point clouds, comparing same with an upper and lower limit for the number of stripe points, and determining whether the number of points satisfies a requirement; and after a series of re-segmentation or re-fusion operations on the local point clouds, adjusting the number of points in each of the local point clouds until the number of points satisfies a range, thereby obtaining a final point cloud stripe. A plurality of local structures capable of being independently coded and decoded are obtained by means of division of a point cloud stripe, and this supports parallel processing, enhances system fault tolerance, and improves coding efficiency.

Abstract: Provided is a Pt(IV) complex. As a prodrug, the Pt(IV) complex is activated by irradiation to release a Pt(II) complex for the treatment of tumors. Also provided is a pharmaceutical composition including the Pt(IV) complex, and the use of the Pt(IV) complex in the preparation of a drug for treating tumors by means of irradiation activation. Further provided is a kit including the Pt(IV) complex and the description, wherein the description indicates that radiotherapy is performed after administration to treat tumors.

Abstract: A method, system, device and computer-readable storage medium for inverse quantization. The method comprises: determining an initial weighted inverse quantization matrix, wherein, the initial weighted inverse quantization matrix is the same as the quantized block in size; setting some matrix elements in the initial weighted inverse quantization matrix to zero to obtain a weighted inverse quantization matrix, wherein, determining the matrix elements that need to be zeroed according to the size of the quantized block; weighted inverse quantizing the quantized coefficients in the quantized block to generate corresponding inverse transform coefficients, wherein, the value of the matrix element corresponding to the position of the quantized coefficient in the weighted inverse quantization matrix is used as a weight coefficient of the weighted inverse quantization.