Abstract: A method, device and equipment for reconstructing a PET image are provided. The method includes acquiring a prior image comprising an anatomical image and an autocorrelation feature image, the autocorrelation feature image being determined based on gray-level co-occurrence matrix of the anatomical image; and acquiring a feature value of the prior image; reconstructing the PET image according to the feature value and an iterative algorithm.

Abstract: This disclosure relates to a composition comprising (a) 4,4?-methylene diphenyl diisocyanate (4,4?-MDI), and (b) at least one heterocyclic compound comprising as ring moiety at least one structure of formula (I) as defined in the description. The heterocyclic compound can suppress the formation of 4,4?-MDI dimer and thus prevent the formation of insoluble solids and extend the shelf life of 4,4?-MDI.

Abstract: Provided VCSEL including substrate, emitters arranged in m×n array, and first ohmic metal layer. Surface of substrate includes light-emitting regions in array of m rows and n columns and non-light-emitting region surrounding each light-emitting region, m×n?2. Each emitter includes first DBR on surface of substrate, active layer on side of first DBR away from substrate, and second DBR on side of active layer away from substrate, at least part of first DBR disposed in respective light-emitting region, active layer and second DBR disposed in respective light-emitting region. First ohmic metal layer disposed on surface of first DBR away from substrate and disposed in non-light-emitting region, projection of first ohmic metal layer on substrate doesn't overlap projections of first and second connecting lines on substrate, first and second connecting lines respectively connects centers of emitters in same row, connects centers of emitters in same column.

Abstract: An apparatus and method for preparing high-purity spherical magnesium and/or high-purity magnesium powder are provided. The apparatus includes a vertical furnace body, a heating zone, and a condensing zone, where a periphery of the condensing zone is provided with a first thermal insulation device and a second thermal insulation device sequentially from bottom to top, and each of the first thermal insulation device and the second thermal insulation device is removably arranged; the periphery of the condensing zone is further provided with a liquid cooling device; a gas inlet and a gas outlet are formed in the condensing zone; and an inner wall of the condensing zone is provided with an arrangement structure configured to arrange a collection device. A heating temperature of a material and condensation conditions in the condensing zone are controlled to make an evaporated magnesium vapor condensed on the collection device in the condensing zone.

Abstract: A high-frequency transformer, includes: an iron core, primary windings and secondary windings, wherein the iron core is of an integrated equilateral triangle structure, the primary windings and the secondary windings are uniformly wound around three sides of the iron core, and the primary windings and/or the secondary windings are symmetrically distributed on the three sides.

Abstract: A concentration gradient fluorescence calibration sheet has a glass substrate and an inorganic nano fluorescent liquid lattice disposed on a surface of the glass substrate. The inorganic nano fluorescent liquid lattice has a plurality of inorganic nano fluorescent liquid sub-lattices. Inorganic fluorescent mixed liquid droplets of each inorganic nano fluorescent liquid sub-lattice are arranged in A rows×B columns. The solution concentration of the same row of inorganic nano fluorescent liquid droplets in the inorganic nano fluorescent liquid sub-lattices is the same, and the solution concentrations of two adjacent rows of inorganic nano fluorescent liquid droplets change in multiples. The concentration gradient fluorescence calibration sheet for the laser microarray chip scanner is utilized to calibrate a scanner under test and a first row of inorganic nano fluorescent liquid droplets in the inorganic nano fluorescent liquid sub-lattices are taken as index marks.

Abstract: The fluorescent antenna includes at least one layer of fluorescent array, the fluorescent array includes a plurality of fluorescent units, and an isolation layer used to isolate emergent optical signals converted by adjacent fluorescent units is included between adjacent fluorescent units. The fluorescent units include at least one fluorescent region; and when the fluorescent antenna includes one layer of fluorescent array, the fluorescent units are all fluorescent regions; or when the fluorescent antenna includes at least two layers of fluorescent arrays, the fluorescent unit further includes at least one transparent region. In two adjacent layers of fluorescent arrays, a transparent region of the first layer overlaps a fluorescent region of the second layer, and an incident optical signal arrives at the fluorescent region of the second layer through the transparent region of the first layer.

Abstract: A magnetic resonance imaging method includes: obtaining three-dimensional under-sampling data of a target object based on a first three-dimensional magnetic resonance imaging sequence; obtaining a three-dimensional point spread function based on the three-dimensional under-sampling data or a two-dimensional mapping data of the target object; obtaining a sensitivity map of the target object based on the data collected by three-dimensional low-resolution complete sampling; performing imaging reconstruction to the three-dimensional under-sampling data based on the three-dimensional point spread function and the sensitivity map to obtain a reconstructed magnetic resonance image. The first three-dimensional magnetic resonance imaging sequence has a first sinusoidal gradient field on a phase direction and a second sinusoidal gradient field on a layer selection direction. 0-order moments of the first and the second three-dimensional magnetic resonance imaging sequences are 0.

Abstract: An apriori guidance network for multitask medical image synthesis is provided. The apriori guidance network includes a generator and a discriminator, wherein the generator includes an apriori guidance module configured to convert an input feature map into a target modal image pointing to a target domain according to an apriori feature, and the apriori feature is a deep feature of the target modal image. The generator is configured to generate a corresponding target domain image by taking the apriori feature of the target modal image and source modal image data as an input. The discriminator is configured to discriminate an authenticity of the target domain image outputted by the generator.

Abstract: A low-dose PET image restoration method and system, a device, and a medium are provided. The method includes: S1, performing blocking processing on a training image comprising a low-dose PET image, an MR image, and a standard-dose PET image to obtain a first patch, and performing first preprocessing on the first patch to obtain a second patch; S2, obtaining, according to the second patch, a first joint dictionary by means of sparse coding and dictionary updating; and S3, restoring the low-dose PET image to a restored image of the standard-dose PET image according to the first joint dictionary.

Abstract: A VCSEL includes a lower Bragg reflection layer, an active layer and an upper Bragg reflection layer. The active layer is located on a side of the lower Bragg reflection layer. The upper Bragg reflection layer is located on a side of the active layer away from the lower Bragg reflection layer. A current limiting layer is disposed inside or outside the active layer, and the current limiting layer has an opening for defining a light-emitting region. An extended cavity layer is disposed at least between the lower Bragg reflection layer and the active layer or between the upper Bragg reflection layer and the active layer, the extended cavity layer includes at least one resonant cavity inside, and the at least one resonant cavity is configured to increase the optical field intensity in the extended cavity layer.

Abstract: An information handling system includes a processor configured to process a training data file to determine an optimal data compression algorithm. The processor may also perform a compression ratio analysis that includes compressing the training data file using data compression algorithms, calculating a compression ratio associated with each of the data compression algorithms, determining an optimal compression ratio from the compression ratio associated with the each data compression algorithm; and determining a desirable data compression algorithm associated with the training data file based on the optimal compression ratio.

Abstract: An item sorting system includes a control server, a first robot, and a second robot, which respectively communicate with the control server and run in a storage area of the item sorting system. The storage area is deployed with at least one item-collecting container, each including at least two sub-compartments. The control server determines a target sub-compartment of the item-collecting container, and sends a sorting instruction to the first robot. The control server sends a transport instruction to the second robot when the target sub-compartment is a first sub-compartment of a first item-collecting container and items accommodated in the first sub-compartment reach a first preset threshold. The first robot delivers an item to the first sub-compartment in response to the sorting instruction. The second robot travels to a position of the first item-collecting container and transports the first item-collecting container to a packaging station in response to the transport instruction.

Abstract: Provided are a method and device for magnetic resonance parameter imaging, medical equipment, and a storage medium. The method comprises: performing acceleration sampling with respect to an image to be reconstructed of an observation target in a preset parameter direction to acquire K-space data corresponding to the image to be reconstructed, calculating, on the basis of the K-space data and of a parameter relaxation model, a parameter value and a compensation coefficient of the image to be reconstructed, generating, on the basis of the compensation coefficient, a compensation image corresponding to the image to be reconstructed, calculating, on the basis of the compensation image, respectively a low-rank part and a sparse part of the image to be reconstructed so as to update the compensation image.

Abstract: The invention relates to the technical field of industrial robots, and particularly relates to a coordinate system calibration method, a device, and a computer readable medium.

Abstract: A computer system provides online state estimation (SE) and topology identification (TI) using advanced metering infrastructure (AMI) measurements in a distribution network. The computer system obtains input data including the AMI measurements, a network configuration, and line parameters; solves an SE and TI problem formulated from the input data and power equations of the distribution network; and periodically updates states and topology of the distribution network during power system operation. To solve the SE and TI problem, the computer system constructs a mixed-integer convex approximation programming (MICP) model to obtain an initial topology; generates neighboring spanning trees according to the MICP model and the initial topology; evaluates performance of each neighboring spanning tree with a matching index that is an indication of power flow performance; and chooses a tree topology of a neighboring spanning tree having a minimum matching index as a final network topology of the distribution network.

Abstract: A wired transceiver includes an output stage circuit and an input stage circuit. The output stage operates in one of a first mode and a second mode according to a mode control signal, and transmits multiple output signals to multiple output pads and receives a first set of bias voltages to provide a first overvoltage protection in the first mode, and stops transmitting the output signals and receives a second set of bias voltages to provide the overvoltage protection in the second mode. The input stage circuit receives multiple input signals from the output pads when the output stage circuit operates in the second mode, and attenuates the input signal to provide a second overvoltage protection.

Abstract: Provided are a semiconductor light source and a driver circuit thereof. The semiconductor light source includes an active layer, a first semiconductor layer, a second semiconductor layer, a first electrode, a second electrode, and a third electrode. The first semiconductor layer and the second semiconductor layer are located on two opposite sides of the active layer. The first electrode is in ohmic contact with the first semiconductor layer. The third electrode is in ohmic contact with the second semiconductor layer. A first dielectric layer is disposed between the first electrode and the second electrode. The first semiconductor layer is a p-type semiconductor layer, and the second semiconductor layer is an n-type semiconductor layer. Alternatively, the first semiconductor layer is an n-type semiconductor layer, and the second semiconductor layer is a p-type semiconductor layer.

Abstract: The present invention is directed to a liquid, storage stable isocyanate composition (Q) comprising monomeric diphenyl methane diisocyanate (MDI) as component (q1) and an amide with a molecular weight of less than 200 g/mol as component (q2) in an amount of 0.1 to 5 wt.-% based on the sum of the weight of components (q1) and (q2) which adds up to 100 wt.-%, wherein the NCO-content is in the range of from 29.5 to 40.0 wt.-% based on the total weight of the respective isocyanate composition (Q). The present invention is also directed to a process for the manufacture of said liquid, storage stable isocyanate composition (Q) as well as the use of an amide with a molecular weight of less than 200 g/mol for the liquification of at room temperature solid isocyanates. Further, the present invention is directed to the use of an isocyanate composition (Q) of the invention for the synthesis of polyurethane foams, compact polyurethane elastomers or thermoplastic polyurethanes.

Abstract: A method for magnetic resonance imaging and plaque recognition includes: obtaining magnetic resonance undersampled K-space data; transforming the magnetic resonance undersampled K-space data to an image domain through inverse Fourier transform to obtain a preprocessed image; reconstructing the preprocessed image through a pre-established deep learning reconstruction model to obtain a high-resolution imaging image of a blood vessel wall; and recognizing plaques in the high-resolution imaging image of the blood vessel wall through a pre-established deep learning plaque recognition model. A neural network corresponding to the pre-established deep learning reconstruction model is a dense connection network. The magnetic resonance undersampled K-space data is head-and-neck combined magnetic resonance undersampled K-space data of the blood vessel wall.