Abstract: A BTA drilling quick-stop device (QSD) and a method, wherein the BTA drilling QSD includes a base. The base includes a hollow cavity. A side portion of the base has an opening communicating with the hollow cavity. The opening is closed by a through cover. A horizontally movable fixture is disposed in the hollow cavity. A stopper is disposed at a top portion of the base. A bottom portion of the stopper is disposed lower than a top portion of the fixture to stop the fixture from moving during processing. An elastic element is disposed between the through cover and a side portion of the fixture to push the fixture to move after processing.

Abstract: A three-dimensional ultrasonic imaging method includes transmitting an ultrasonic wave to a fetal head; receiving an ultrasonic echo, obtaining an ultrasonic echo signal, and obtaining the three-dimensional volume data of the fetal head according to the ultrasonic echo signal; according to the characteristics of a median sagittal section of the fetal head, detecting the median sagittal section in the three-dimensional volume data; and displaying the median sagittal section.

Abstract: A method for preparing a shell-bionic ceramic tool and a shell-bionic ceramic tool, wherein the shell-bionic ceramic tool includes alternating stacks of ceramic powders with different components, pressing a ceramic green body using a cold briquetting method, carrying out pre-pressing once using a graphite indenter on a working surface thereof after each layer of the ceramic powder being loaded, and pressing a last layer using a graphite rod, and then pressing a whole ceramic green body with a certain pressure to promote a bonding of the layers of ceramic powder, which in turn gives a complex shape to an interface between the layers, increases a bonding area between the layers, and plays the role of hindering crack expansion, extending the crack expansion path, and improving the bonding strength of the interface; after then, hot-pressed sintering is used to densify the ceramic green body to obtain the shell-bionic ceramic tool.

Abstract: A cleaning device includes a base, a positioning component, and a cleaning component, all mounted on the base. The positioning component includes a fixture and a side pushing member, the side pushing member located alongside the fixture. The side pushing member is used to push a workpiece into a limiting area of the fixture, where the fixture secures the workpiece in place. The cleaning component includes an exhaust member and a suction member. The exhaust member blows gas into contaminated holes, the gas is then sucked by the suction member.

Abstract: The present disclosure provides a method for preparing lithium iron phosphate from ferric hydroxyphosphate, including: purifying ferrous sulfate to form a ferrous sulfate solution, adding hydrogen peroxide, phosphoric acid, an ammonium dihydrogen phosphate solution and ammonia water into the ferrous sulfate solution and then reacting to form a mixed slurry, holding the mixed slurry at a temperature for a period of time, and then washing with water and subjecting to press filtration to form ferric hydroxyphosphate precursors with different iron-phosphorus ratios; then flash drying, sintering at a high temperature, and pulverizing to obtain ferric hydroxyphosphate precursors with different iron-phosphorus ratios and different specific surface areas.

Abstract: A hydrogel for cell-laden bioprinting, bioink, and a preparation method and an application thereof, relates to the technical field of biomedical polymer hydrogels. The hydrogel for cell-laden bioprinting is polymer gel formed by adding a cell-specific material into a matrix of alginate and gelatin and crosslinking and curing, wherein the cell-specific material is polypeptide selected according to different laden cells. The structures printed using the hydrogel may have the advantages such as adjustable mechanical properties, adjustable porosity, high biocompatibility, high printing accuracy, and high customizability, which may widely support the printing of human tissues and organs such as spinal cord, cartilage, and heart, and has good prospects for applications in tissue repair, organ transplantation and so on.

Abstract: Disclosed are compounds of Formula I, methods of using the compounds for inhibiting KRAS activity and pharmaceutical compositions comprising such compounds. The compounds are useful in treating, preventing or ameliorating diseases or disorders associated with KRAS activity such as cancer.

Abstract: The present invention relates to the fields of microorgan-isms, feed, food and ecological restoration, in particular to a strain for degrading deoxynivalenol (DON) and the use thereof. The strain has the deposit number CCTCC No. M 2020565. The strain can grow by means of taking the toxic compound DON as a sole carbon source, and convert the DON into chemical components for itself. The reaction process is irreversible, the reaction conditions are moderate, and secondary pollu-tion cannot be caused. The strain provided in the present invention can be used for preparing a biological detoxification preparation for DON. The strain provided in the present invention can be used for degrading DON in feed and food raw materials, primary processing products, deep processing products and related processing byproducts. The strain provided in the present invention can be applied to various ecosystems such as soil or bodies of water polluted by DON to achieve the purposes of DON degradation and ecological restoration.

Abstract: An alumina-based ceramic tool material with low thermal expansion and a preparation process thereof, accordingly, the ceramic tool material may have both the high hardness of alumina ceramics after the hot pressing sintering, and reduces the thermal expansion coefficient of the overall ceramic material by adding the Sc2W3O12 as the negative thermal expansion phase, which improves the thermal shock resistance of ceramic tools in high-speed cutting engineering and meets the requirements of large temperature range during the machining of nickel-based superalloys. Moreover, the composite material does not use metal binder and has strong thermal stability even in the high-speed machining under extreme heat-force-chemistry coupling, so it has a high machining compatibility for nickel-based superalloys.

Abstract: A method for automatic identification of a measurement item includes: acquiring gray values of pixels of a specified section image, where the gray values of the pixels correspond to ultrasound echoes generated by reflection of ultrasound waves by a tissue under examination; determining a section type of the specified section image based on one or more characteristics defined by the gray values of the pixels, the section type identifying a particular section of a particular area of the tissue from which the specified section image is acquired; identifying at least one measurement item which is measurable in the specified section image according to the section type of the specified section image; and obtaining a value of the identified at least one measurement item according to the specified section image.

Abstract: An electrode assembly may comprise a positive electrode plate and a negative electrode plate, wherein a positive electrode active material layer of the positive electrode plate may comprise a positive electrode active material and a quinone compound; and a negative electrode active material layer of the negative electrode plate may comprise a negative electrode active material and a conductive polymer material, wherein based on the mass of the positive electrode active material layer, the mass content of the quinone compound mc % may be 0.5% to 3%; the capacity per gram of the quinone compound may be Capc; the capacity per gram of the positive electrode active material may be Cap; and based on the mass of the negative electrode active material layer, the mass content of the conductive polymer material may be mA %, satisfying the relationship of: 0 . 2 ? C ? a ? p C - Cap Cap × m C / m A ? 5 .

Abstract: An intervention guidance device (10) includes a main body portion (100) and a guidance portion (200). The guidance portion (200) has a contracted configuration and an expanded configuration. In the expanded configuration, the guidance portion (200) has a central area (201) and a closed outer edge (202). In the contracted configuration, the outer edge (202) is farther away from the main body portion (100) than the central area (201), and the guidance portion (200) is restorable from the contracted configuration to the expanded configuration. In the intervention guidance device (10), the radial dimension of the guidance portion (200) is larger than the distance between the chordae tendineae, so that an effective access path that does not cross the chordae tendineae can be established, the subsequent implantation of a heart valve prosthesis does not pass through the chordae tendineae, and the success rate of a heart valve prosthesis implantation surgery can be improved.

Abstract: An electrode assembly may comprise a positive electrode plate and a negative electrode plate, wherein a positive electrode active material layer of the positive electrode plate may comprise a positive electrode active material and a quinone compound; and a negative electrode active material layer of the negative electrode plate may comprise a negative electrode active material and a conductive polymer material, wherein based on the mass of the positive electrode active material layer, the mass content of the quinone compound mc % may be 0.5% to 3%; the capacity per gram of the quinone compound may be CapC; the capacity per gram of the positive electrode active material may be Cap; and based on the mass of the negative electrode active material layer, the mass content of the conductive polymer material may be mA %, satisfying the relationship of: 0.2 ? Cap C - Cap Cap × m C / m A ? 5.

Abstract: A method for automatic identification of a measurement item is provided. The method comprises acquiring, via an image acquisition module, gray values of pixels of a specified section image corresponding to ultrasonic echoes generated by reflection of ultrasound waves by a tissue under examination; identifying, via an identification module, at least one measurement item corresponding to the specified section image based on the gray values of the pixels; and measuring, via a measuring module, a measurement item parameter of the specified section image based on the measurement item identified. Because the measurement item of a specified section image can be automatically identified based on the content thereof, the user does not need to move a trackball to select measurement items, and therefore efficiency is increased.

Abstract: This application provides a secondary battery, including a negative electrode plate, where the negative electrode plate may include: a negative electrode current collector; a first negative electrode film layer disposed on at least one surface of the negative electrode current collector, where the first negative electrode film layer may include a first negative electrode active material and a first conductive polymer, a mass percentage of the first conductive polymer in the first negative electrode film layer is recorded as A, and A?6%; and a second negative electrode film layer disposed on a surface of the first negative electrode film layer, where the second negative electrode film layer may include a second negative electrode active material and a second conductive polymer, and a mass percentage of the second conductive polymer in the second negative electrode film layer is recorded as B; where the negative electrode plate may satisfy A>B.

Abstract: The present invention relates to the field of genetic engineering, particularly to a glucose oxidase mutant having improved thermal stability, gene and application thereof. The present invention provides several glucose oxidase GOD mutants with high catalytic efficiency and improved thermal stability, which breaks the barrier of low enzyme activity and poor stability and is suited well to meet the requirements of application to the fields of food, medicine, feed and textile industry, and has a very broad application prospect.

Abstract: The present invention relates to the field of genetic engineering, particularly to a glucoamylase TIGa15, gene and application thereof. Said glucoamylase comprises the amino acid sequence of SEQ ID NO:1 or SEQ ID NO:2 and has the excellent enzymic properties, which can be applied to feed, food, and medicine industries, can be industrially produce with the genetic engineering technics.

Abstract: The present invention provides use of a manganese peroxidase in the detoxification of mycotoxins, and specifically, the present invention provides five manganese peroxidases (MnP-1, MnP-2, MnP-4, MnP-5, and MnP-6), genes thereof, and uses thereof. The present invention provides five manganese peroxidases (MnP-1, MnP-2, MnP-4, MnP-5, and MnP-6) derived from lignocellulose degradation bacteria, the amino acid sequences thereof being as set forth in SEQ ID NO: 1, SEQ ID NO: 4, SEQ ID NO: 7, SEQ ID NO: 10, and SEQ ID NO: 13.

Abstract: A negative electrode current collector includes a first metal layer, a second metal layer, and a prelithiation layer disposed between the first metal layer and the second metal layer. At least one of the first metal layer or the second metal layer has a porous structure.