Abstract: Disclosed are a detection collimation unit, a detection apparatus and a SPECT imaging system. The detection collimation unit includes: a scintillation crystal array configured to receive a gamma photon emitted by a radioactive source in a detected object; and a number of photoelectric devices configured to receive the gamma photon and converting the gamma photon into a digital signal. The scintillation crystal array includes a number of scintillation crystals. The number of scintillation crystals are arranged substantially in parallel and are spaced from each other. Each scintillation crystal has a side face configured to receive a ray emitted by the radioactive source and an end face. The number of photoelectric devices are coupled to the end faces of the number of scintillation crystals.

Abstract: A system and a method for performing hierarchical domain routing and intent classification on user queries in order to improve accuracy in responding to such queries and to create smoother conversations between virtual voice assistants and users are provided. The method includes: receiving an utterance from a user; analyzing the utterance in order to make an initial determination of user intent and a confidence level that relates thereto; when the confidence level is less than a threshold, applying an artificial intelligence (AI) model that is configured to assign the received utterance to one or more domains; outputting, based on the assigned domain(s), information that prompts the user to provide additional input that relates to the user intent; receiving the additional input; and secondarily determining, based on the additional input, the user intent.

Abstract: Disclosed are a detection collimation unit, a detection apparatus and a SPECT imaging system. The detection collimation unit includes: a scintillation crystal array configured to receive a gamma photon emitted by a radioactive source in a detected object; and a number of photoelectric devices configured to receive the gamma photon and converting the gamma photon into a digital signal. The scintillation crystal array includes a number of scintillation crystals. The number of scintillation crystals are arranged substantially in parallel and are spaced from each other. Each scintillation crystal has a side face configured to receive a ray emitted by the radioactive source and an end face. The number of photoelectric devices are coupled to the end faces of the number of scintillation crystals.

Abstract: The present disclosure provides a gamma ray imaging device and an imaging method, where the imaging device includes a plurality of separate detectors. The plurality of separate detectors are provided at an appropriate spatial position, in an appropriate arrangement manner and are of an appropriate detector material, such that when rays emitted from different positions in an imaging area reach at least one of the plurality of separate detectors, at least one of the thicknesses of the detectors, the materials of the detectors, and the numbers of the detectors though which the rays pass are different, thereby achieving the effect of determining the directions of rays.

Abstract: Load balancing is described for a distributed computing system. For instance, resource usage information of devices in a distributed system is collected at a target device in the distributed system. Further a first work task for the target device is determined to be stopped based on the resource usage information, the target device having a first authority to execute the first work task. The first authority is then caused to be released. Beneficially, each node in the distributed system can individually balance different task loads and the use of resources by different operations of the task, thereby improving the performance of the distributed system.

Abstract: Event ordering is provided in a distributed file system. For instance, events are generated that are associated with an object collected from nodes in the distributed file system, and an event loop indicates causal dependencies among the events, and comprises one or more reliable edges and unreliable edges. Degrees of reliability of the unreliable edges in the event loop are determined, and then at least one unreliable edge is removed from the event loop based on the determined degrees of reliability. Causal dependencies among the events in the distributed file system are analyzed by using a statistical method, and the most unreliable edge in the event loop can be removed by computing a degree of reliability of each unreliable edge, thereby avoiding the occurrence of the event loop.

Abstract: Load balancing is described for a distributed computing system. For instance, resource usage information of devices in a distributed system is collected at a target device in the distributed system. Further a first work task for the target device is determined to be stopped based on the resource usage information, the target device having a first authority to execute the first work task. The first authority is then caused to be released. Beneficially, each node in the distributed system can individually balance different task loads and the use of resources by different operations of the task, thereby improving the performance of the distributed system.

Abstract: The present disclosure provides a gamma ray imaging device and an imaging method, where the imaging device includes a plurality of separate detectors. The plurality of separate detectors are provided at an appropriate spatial position, in an appropriate arrangement manner and are of an appropriate detector material, such that when rays emitted from different positions in an imaging area reach at least one of the plurality of separate detectors, at least one of the thicknesses of the detectors, the materials of the detectors, and the numbers of the detectors though which the rays pass are different, thereby achieving the effect of determining the directions of rays.

Abstract: Embodiments of the present disclosure provide a method, an electronic device and a computer program product of load balancing. The method comprises collecting, at a target device in a distributed system, resource usage information of a plurality of devices in the distributed system. The method further comprises determining a first work task for the target device to be stopped based on the resource usage information, the target device having a first authority to execute the first work task. The method further comprises causing the first authority to be released. With the embodiments of the present disclosure, each node in the distributed system can individually balance different task loads and the use of resources by different operations of the task, thereby improving the performance of the distributed system.

Abstract: Provided are an imaging system and method based on multiple-gamma photon coincidence events. The imaging system includes: a plurality of detector assemblies arranged in a non-parallel manner, a time coincidence module and a computer platform. Each detector assembly includes a collimator and a detector configured to measure time and to detect a multiple-gamma photon coincidence event constituted by a plurality of single-gamma photon events cascade-emitted by a radionuclide within a short time. The method is configured to determine validity of the multiple-gamma photon coincidence event, calculate a plurality of non-parallel projection lines where the decay of the radionuclide takes place, determine a location where the decay of the radionuclide takes place according to the non-parallel projection lines, and obtain a distribution of the radionuclide in the subject according to the location where the decay of the radionuclide takes places.

Abstract: Embodiments of the present disclosure provide a method, an electronic device and a computer program product of load balancing. The method comprises collecting, at a target device in a distributed system, resource usage information of a plurality of devices in the distributed system. The method further comprises determining a first work task for the target device to be stopped based on the resource usage information, the target device having a first authority to execute the first work task. The method further comprises causing the first authority to be released. With the embodiments of the present disclosure, each node in the distributed system can individually balance different task loads and the use of resources by different operations of the task, thereby improving the performance of the distributed system.

Abstract: Event ordering is provided in a distributed file system. For instance, events are generated that are associated with an object collected from nodes in the distributed file system, and an event loop indicates causal dependencies among the events, and comprises one or more reliable edges and unreliable edges. Degrees of reliability of the unreliable edges in the event loop are determined, and then at least one unreliable edge is removed from the event loop based on the determined degrees of reliability. Causal dependencies among the events in the distributed file system are analyzed by using a statistical method, and the most unreliable edge in the event loop can be removed by computing a degree of reliability of each unreliable edge, thereby avoiding the occurrence of the event loop.

Abstract: Provided are an imaging system and method based on multiple-gamma photon coincidence events. The imaging system includes: a plurality of detector assemblies arranged in a non-parallel manner, a time coincidence module and a computer platform. Each detector assembly includes a collimator and a detector configured to measure time and to detect a multiple-gamma photon coincidence event constituted by a plurality of single-gamma photon events cascade-emitted by a radionuclide within a short time. The method is configured to determine validity of the multiple-gamma photon coincidence event, calculate a plurality of non-parallel projection lines where the decay of the radionuclide takes place, determine a location where the decay of the radionuclide takes place according to the non-parallel projection lines, and obtain a distribution of the radionuclide in the subject according to the location where the decay of the radionuclide takes places.

Abstract: A type of sintered Nd—Fe—B permanent magnet with high corrosion resistance is produced by dual alloy method. The method comprises the following steps: preparing the powders of master phase alloy and intergranular phase alloy respectively, mixing the powders, compacting the powders in magnetic field, sintering the compacted body at 1050˜1125° C., and annealing at 920-1020° C. and 500-650° C. successively.

Abstract: A type of sintered Nd—Fe—B permanent magnet with high intrinsic coercivity of about 30KOe or more is produced by dual alloy method. The method comprises the following steps: preparing the powders of master phase alloy and intergranular phase alloy respectively, mixing the powders, compacting the powders in magnetic field, sintering the compacted body at 1050˜1125° C. and annealing at 890-1000° C. and 500-650° C. successively. In the process of preparing the powder of intergranular phase alloy, the nano-powder additive selected from the group consisting of NiAl, TiC, SiC, AlN, TiN, ZrN and the combination thereof is used to modify the powder of intergranular phase alloy.

Abstract: A type of sintered Nd—Fe—B permanent magnet with high intrinsic coercivity of about 30KOe or more is produced by dual alloy method. The method comprises the following steps: preparing the powders of master phase alloy and intergranular phase alloy respectively, mixing the powders, compacting the powders in magnetic field, sintering the compacted body at 1050˜1125° C. and annealing at 890-1000° C. and 500-650° C. successively. In the process of preparing the powder of intergranular phase alloy, the nano-powder additive selected from the group consisting of NiAl, TiC, SiC, AlN, TiN, ZrN and the combination thereof is used to modify the powder of intergranular phase alloy.

Abstract: A type of sintered Nd—Fe—B permanent magnet with high corrosion resistance is produced by dual alloy method. The method comprises the following steps: preparing the powders of master phase alloy and intergranular phase alloy respectively, mixing the powders, compacting the powders in magnetic field, sintering the compacted body at 1050˜1125° C., and annealing at 920-1020° C. and 500-650° C.