Abstract: A cutting stock method for a rectangular sheet with defects includes: acquiring information of the rectangular defective sheet, including dimension information of the rectangular sheet and target blocks, and location information of the defects; acquiring a cutting position discrete set of the rectangular sheet; cutting the rectangular sheet according to the cutting position discrete set into a plurality of target blocks; calculating a sum of values of the target blocks, and selecting an optimal cutting solution with the largest sum of values; and cutting the rectangular sheet according to the optimal cutting solution.

Abstract: The present invention relates to a frequency-stable low-dielectric microwave dielectric ceramic material and a preparation method thereof. The material is prepared from the following components in percentage by mass: 70-90% of a main-phase ceramic material A, 10-30% of an auxiliary-phase ceramic material B and 0-1.0% of an oxide sintering aid C. The main-phase ceramic material A is MgxMeySiO2+x+y; the auxiliary-phase ceramic material B is composed of ?RO-bRe2O3-cTiO2, R is at least one of Ca or Sr, Re2O3 is at least two of Sm2O3, Nd2O3, Y2O3, Al2O3 and La2O3; and the oxide sintering aid C is at least one of MnO2, WO3 and CeO2.

Abstract: An electrode sheet oven drying apparatus includes an oven provided with an oven drying chamber, an oven drying assembly positioned in the oven drying chamber, an air discharge pipe connected to the oven drying chamber, a first air volume regulating valve installed at one end of the air discharge pipe connected to the oven drying chamber, a humidity detection module installed in the oven drying chamber and configured to detect a humidity in the oven drying chamber, and a control module communicatively connected to the humidity detection module and configured to regulate the first air volume regulating valve according to the humidity in the oven drying chamber.

Abstract: A minimal-copy-ratio of templates is a problem in detecting early stage cancer where minimal copies of somatic cancer-specific mutations are targeted in the presence of large copies of wildtype genome DNA, commonly a 1/10,000 or even less minimal-copy-ratios between the mutant target and wildtype control templates. To overcome this problem, delayed pyrophosphorolysis activated polymerization (delayed-PAP) was developed which can delay product accumulation of the wildtype control to a much later time or cycle, such as by 15 cycles or by 30,000 folds. In the multiplex format, delayed-PAP is particularly useful to amplify not only the wildtype control but also mutant target templates accurately and consistently in the minimal-copy-ratio situation.

Abstract: A base station antenna comprises a reflector assembly and a first radiating element having a first feed stalk and a first radiator. A base of the first feed stalk is adjacent the reflector assembly and the first radiator is adjacent a distal end of the first feed stalk. A center of the first radiator is offset from the base of the first feed stalk in a longitudinal direction that is parallel to a longitudinal axis of the base station antenna.

Abstract: A packing method for a defective sheet based on branch-and-cut algorithm, including: acquiring sheet information, where the sheet information includes size information of the defect sheet, size information of a target block and position information of a defect; based on actual cutting requirements, establishing constraints; and establishing a primal problem model according to the constraints; converting the primal problem model into a relaxed problem model; checking and verifying the obtained solution by x-check method to determine whether the obtained solution meets the constraints of the primal problem model; outputting the optimal solution to obtain an optimal cutting plan that meets the actual cutting requirements; and cutting the defective sheet according to the optimal cutting plan. A system for implement the packing method is also provided.

Abstract: A compliant mechanical system for Mini/Micro chip mass transfer and packaging comprises a flexure-based continuous ejector pin mechanism including a drive support plate, a mounting base, first thorn die attach drive devices, second thorn die attach drive devices, first flexible hinges, second flexible hinges, and a pricking pin. The first thorn die attach drive devices and the second thorn die attach drive devices are mounted on the drive support plate. A drive end of the first thorn die attach drive device horizontally passes rightward through the first flexible hinge at a corresponding position; a drive end of the second thorn die attach drive device horizontally passes leftward through the first flexible hinge at a corresponding position; and the mounting base is hinged to the drive ends of the two thorn die attach drive devices through the second flexible hinges.

Abstract: A self-moving robot includes a shell, a driving module, driving the self-moving robot to move on the ground; a mowing module, executing mowing work; an energy module, providing energy for the self-moving robot; a control module, controlling the self-moving robot to automatically move and execute work, the self-moving robot further includes a cleaning module executing ground cleaning work; the self-moving robot has a mowing mode and a cleaning mode, under the mowing mode, the control module controls the self-moving robot to execute mowing work, and under the cleaning mode, the control module controls the self-moving robot to execute cleaning work.

Abstract: Embodiments of the disclosure provide an ultrasound beamforming method and device. The method includes: obtaining channel data of a target tissue; and processing the channel data using at least two different ultrasound beamforming methods to obtain image data of the target tissue corresponding to the different ultrasound beamforming methods, where the at least two different ultrasound beamforming methods are different in at least one of principle, step, and parameter.

Abstract: A laser cutting method for irregular parts based on machine vision includes: (A) obtaining and numbering vertices of all parts on the layout diagram; (B) planning a part vertex set and an empty cutting path vertex set; (C) obtaining a shortest empty cutting path and the empty cutting path vertex set with the shortest empty cutting path; (D) cutting the parts one by one according to an order obtained by the CPLEX algorithm. This application further provides a laser cutting system.

Abstract: The present invention relates to a preparation method for acetylated sodium hyaluronate, which pertains to the field of organic chemical synthesis, characterized in that, the preparation method includes the following steps: in the protective atmosphere of inert gas, subjecting a hyaluronate and an acetic anhydride to a catalytic reaction in an organic solvent with a catalyst added, adding a water absorbent during the reaction, obtaining a reaction liquid, subjecting a reaction liquid to post treatment, separation, purification, and drying to obtain a product. A too high or too low degree of substitution is effectively avoided in the present invention, so as to obtain a product with a degree of substitution of acetyl groups ranging from 2.7 to 3.2, with mild reactive materials and reacting conditions, and simple separation and purification steps.

Abstract: A compliant mechanical system for Mini/Micro chip mass transfer and packaging comprises a flexure-based continuous ejector pin mechanism including a drive support plate, a mounting base, first thorn die attach drive devices, second thorn die attach drive devices, first flexible hinges, second flexible hinges, and a pricking pin. The first thorn die attach drive devices and the second thorn die attach drive devices are mounted on the drive support plate. A drive end of the first thorn die attach drive device horizontally passes rightward through the first flexible hinge at a corresponding position; a drive end of the second thorn die attach drive device horizontally passes leftward through the first flexible hinge at a corresponding position; and the mounting base is hinged to the drive ends of the two thorn die attach drive devices through the second flexible hinges.

Abstract: A nuclear island base slab of a nuclear power plant and a manufacturing method therefor, and a nuclear island of a nuclear power plant. The nuclear island base slab of a nuclear power plant includes a concrete base slab body and a plurality of air ducts embedded in the concrete base slab body. The air duct has an internal-penetrating bent pipe structure. A first end of the air duct is exposed on an upper surface of the concrete base slab body. A second end of the air duct is exposed on a side surface or the upper surface of the concrete base slab body.

Abstract: Mechanisms for analyzing a structured file for malicious content are provided, comprising: parsing the structured file into a plurality of portions; selecting a selected portion of the portions; checking the selected portion to determine if at least one pre-condition is met; and in response to determining that the at least one pre-condition is met: decoding the selected portion to form a decoded portion; and checking the decoded portion to determine if it is malicious. In some embodiments: the at least one pre-condition can be changed; the structured file is a MICROSOFT OFFICE XML file; the selected portion is a file; the at least one pre-condition checks at least one attribute of the selected portion; decoding the selected portion comprises decompressing the selected portion; and/or checking the decoded portion to determine if it is malicious comprises checking whether a previously decoded portion of the structure file meets at least one condition.

Abstract: Provided is a method for preventing the accumulation of cylinder oil at scavenging ports of low-speed marine engines. An oil passage is provided on a cylinder wall inside a cylinder. The oil passage includes multiple oil storage grooves processed in a circumferential direction of the cylinder wall. The oil passage is formed by obliquely extending from the inner side of the cylinder wall to the outside of the cylinder in a radial direction of the cylinder. The scavenging ports are uniformly distributed in a circumferential direction of the cylinder wall, and each of the oil storage grooves is correspondingly processed at an upper portion of the scavenging port upper edge of the scavenging port. Each of the oil storage grooves has a shape matching the curved surface of the scavenging port upper edge.

Abstract: A self-propelled towing simulator for a hydraulic lift system carries a gyro pose control system and a six-degree-of-freedom (DOF) platform to control the overall pose of the simulator, so that the simulator simulates six-DOF motion states including swaying, surging, yawing, rolling, pitching and heaving generated by a mining vessel under the combined action of waves and flows and required by the experimental working conditions; interventions in the pose of the simulator may be positive or negative, so that the simulator may be applied to the uncontrollable natural water bodies so as to approximate to the working conditions of the experimental requirements. The simulator may carry out experiments in open natural water bodies by use of its own autonomous sailing capability under remote wireless control and may acquire parameters such as dynamic characteristics and spatial configuration and the like of a deep-sea mining hydraulic lift subsystem in real time.

Abstract: A flexure-based continuous ejector pin mechanism for Mini/Micro chip mass transfer includes a first drive frame, a second drive frame, a mounting base, a first thorn die attach drive device, a second thorn die attach drive device, first flexible hinges, second flexible hinges, and a pricking pin. The second drive frame and the first drive frame are connected through the first flexible hinge. The mounting base is connected to a left side and a right side of the second drive frame through the second flexible hinges. Compared with a laser transfer technology, the flexible movable thorn die attach device has lower cost and higher accuracy; compared with a vacuum nozzle transfer technology, the flexible movable thorn die attach device has higher transfer efficiency and quality; and compared with a conventional thorn die attach device, the flexible movable thorn die attach device has higher transfer efficiency and precision.