Abstract: A single-stage three-phase voltage source inverter circuit structure with a cascaded magnetic integrated switching inductor-capacitor network includes an input DC power supply, a magnetic integrated switching inductor-capacitor network, a three-phase inverter bridge, a three-phase filter, a three-phase AC load or a three-phase AC grid successively connected in cascade. The magnetic integrated switching inductor-capacitor network includes an energy storage inductor, and two identical SLCC type two-port switching inductor-capacitor network units which are successively connected in cascade and connected in series. A magnetic integration structure of the three energy storage inductors is configured to have magnetic coupling of the three inductors, magnetic decoupling of the three inductors, or magnetic coupling of each inductor with the other two inductors, which are respectively realized by an EE type magnetic core, a four-leg type magnetic core, and an EE type magnetic core.

Abstract: The disclosure provides a milling system and method under different lubrication conditions. The system uses a tool to mill the workpiece, a force measuring system to measure the milling force, a tool change system to replace the tools, a tool storage to store the tools. It can store the tools, provide the lubricating oil to the milling surface, select different tools according to different processing conditions, select the best angle differences of the unequal spiral angle tools according to different conditions comprising dry cutting, casting-type lubrication, minimal quantities of lubrication or minimal quantities of nanofluid lubrication, and/or choose the optimal tool according to different cutting parameters in order to obtain the minimum milling force.

Abstract: The disclosure provides a method and system for injecting cutting fluid during milling under different working conditions. By analyzing influence of an airflow field in a milling area under different working conditions on injection of cutting fluid, an influence rule of a helical angle and a rotation speed of a cutter on the flow field is quantitatively analyzed, an optimal target distance of a nozzle, an angle between the nozzle and a milling cutter feeding direction and an angle between the nozzle and the surface of a workpiece are comprehensively determined, the nozzle is set according to a determined setting manner, and lubricating oil is sprayed to the milling area by utilizing the nozzle.

Abstract: A double-steel tube concrete beam-column joint with internal FRP bar connectors is provided. The double-steel tube concrete beam-column joint includes double-steel tube columns, I-beams, a joint connector, an internal support member and external ring plates. Each double-steel tube column includes an internal steel tube and an external steel tube. The joint connector includes an internal connecting tube and an external connecting sleeve which are both circular steel tubes. The internal support member is a columnar structure and has two ends regularly formed with bolt holes in a circumferential direction. Each external ring plate comprises a horizontal portion and an annular portion perpendicular to the horizontal portion. Upper and lower double-steel tube columns are connected through the joint connector and the internal support member, the two ends of the internal support member are inserted into an upper internal steel tube and a lower internal steel tube, respectively.

Abstract: A carbon nanotube (CNT) assembled thin film modified steel wire array electrode, a preparation method and application thereof. The array electrode includes: a surface of a steel wire is negatively modified, and the surface of the steel wire is assembled with a plurality of layers of CNT thin films; one end of the steel wire is welded to a conductor, and a welding position between the steel wire and the conductor is wrapped with an insulating heat shrinkable tube; and the insulating template and the steel wire are encapsulated and cured by using an epoxy resin. The preparation method of the array electrode of the invention mainly includes the following steps: first, performing negative modification on a steel wire, then, assembling CNT thin films on the steel wire, and preparing the modified array steel wire into the CNT assembled thin film modified steel wire array electrode.

Abstract: A nano-modified material for cavity wall with insulation for prefabricated building, preparation method and application thereof, belonging to the technical field of building materials. The material includes splicing structures and a nano-modified silane waterproof coating, wherein the splicing structure includes a recycled concrete structure layer and a nano-modified foam concrete thermal insulation core layer, the recycled concrete structure layer is a hollow cuboid structure with openings at both ends, the nano-modified foam concrete thermal insulation core layer is a structure formed by casting inside the recycled concrete structure layer, and the nano-modified silane waterproof coating is applied at a butt joint of two of the splicing structures.

Abstract: A performance-level seismic motion hazard analysis method includes: (1) extracting seismic motion data and denoising the data; (2) extracting feature parameters from the data, and carrying out initialization; (3) generating a training set, an interval set and a test set; (4) training a multi-layer neural network based on the training set; (5) training output values of the neural network based on the interval set, and calculating a mean and a standard deviation of relative errors of the output values; (6) training the neural network based on the test set to determine output values, and calculating a magnitude interval based on an interval confidence; (7) carrying out probabilistic seismic hazard analysis to determine an annual exceeding probability and a return period of a performance-level seismic motion; and (8) determining a magnitude and an epicentral distance that reach the performance-level seismic motion based on the performance-level seismic motion and consistent probability.

Abstract: A multi-winding single-stage multi-input boost type high-frequency link's inverter with simultaneous/time-sharing power supplies, having the circuit structure formed by connecting a plurality of mutually isolated high-frequency inverter circuits having an input filter and an energy storage inductor, a common output cycloconverter and filter circuit by a multi-input single-output high-frequency transformer. Each input end of the multi-input single-output high-frequency transformer is connected in one-to-one correspondence to the output end of each high-frequency inverter circuit. The output end of the multi-input single-output high-frequency transformer is connected to the input end of the output cycloconverter and filter circuit. The inverter has the following characteristics: multiple input sources are connected to a common ground or a non-common ground. The multiple input sources supply power to load in a simultaneous/time-sharing manner. The output and input high-frequency isolation is performed.

Abstract: A method for preparing a dual-functional hybrid thin-film for self-calibration detection of tumor-derived exosomes is disclosed. A dual-functional hybrid thin-film, aptamer-BPNSs/Fc/ZIF-67/ITO, is constructed by facile self-assembly of a cobalt-based metal-organic framework (ZIF-67) composite doped with black phosphorus nanosheets (BPNSs), an aptamer and ferrocene (Fc) on an indium tin oxide (ITO) electrode. Methylene blue (MB) labeled aptamer specifically binds to CD63 protein to precisely capture protein. The protein is a specific biomolecule carried by breast cancer MCF-7 cell exosome, and realizes the detection of the tumor cell exosome. A self-calibration sensor for quantitative detection of the tumor exosome is constructed by using MB as a response signal and Fc as a reference.

Abstract: A method for preparing a ratiometric electrochemical miR3123 aptasensor based on a copper-based metal-organic framework (Cu-MOF) composite doped with black phosphorus nanosheets (BPNSs) and thionine (TH) is provided. TH/Cu-MOF is prepared by reacting TH with Cu-MOF precursor, and BPNSs/TH/Cu-MOF is prepared by drop coating the BPNSs and drop coated onto an electrode. A ferrocene (Fc)-labeled single-stranded DNA aptamer is adsorbed on the BPNSs to prepare aptamer-BPNSs/TH/Cu-MOF. Target molecule miR3123 is bonded with the single-stranded DNA aptamer Fc-DNA, Fc-DNA is forced to escape from the BPNSs. Electrochemical signals of Fc are, therefore, weakened while TH signals are slightly affected. The ratiometric electrochemical miR3123 aptasensor is constructed by fitting a linear relationship between peak current intensity ratios IFc/ITH and concentrations of the miR3123.

Abstract: A method for preparing a dual-functional hybrid thin-film for self-calibration detection of tumor-derived exosomes is disclosed. A dual-functional hybrid thin-film, aptamer-BPNSs/Fc/ZIF-67/ITO, is constructed by facile self-assembly of a cobalt-based metal-organic framework (ZIF-67) composite doped with black phosphorus nanosheets (BPNSs), an aptamer and ferrocene (Fc) on an indium tin oxide (ITO) electrode. Methylene blue (MB) labeled aptamer specifically binds to CD63 protein to precisely capture protein. The protein is a specific biomolecule carried by breast cancer MCF-7 cell exosome, and realizes the detection of the tumor cell exosome. A self-calibration sensor for quantitative detection of the tumor exosome is constructed by using MB as a response signal and Fc as a reference.

Abstract: A method for preparing a ratiometric electrochemical miR3123 aptasensor based on a copper-based metal-organic framework (Cu-MOF) composite doped with black phosphorus nanosheets (BPNSs) and thionine (TH) is provided. TH/Cu-MOF is prepared by reacting TH with Cu-MOF precursor, and BPNSs/TH/Cu-MOF is prepared by drop coating the BPNSs and drop coated onto an electrode. A ferrocene (Fc)-labeled single-stranded DNA aptamer is adsorbed on the BPNSs to prepare aptamer-BPNSs/TH/Cu-MOF. Target molecule miR3123 is bonded with the single-stranded DNA aptamer Fc-DNA, Fc-DNA is forced to escape from the BPNSs. Electrochemical signals of Fc are, therefore, weakened while TH signals are slightly affected. The ratiometric electrochemical miR3123 aptasensor is constructed by fitting a linear relationship between peak current intensity ratios IFc/ITH and concentrations of the miR3123.

Abstract: The disclosure provides a method and system for milling injected cutting fluid under different working conditions. By analyzing influence of airflow fields in a milling area under different working conditions on injection of cutting fluid, an influence rule of a helical angle and a rotation speed of a cutter on the flow field is quantitatively analyzed, an optimal target distance of a nozzle, an angle between the nozzle and a milling cutter feeding direction and an angle between the nozzle and the surface of a workpiece are comprehensively determined, the nozzle is set according to a determined setting manner, and lubricating oil is sprayed to the milling area by utilizing the nozzle.

Abstract: An electrostatic nozzle and a minimal quantity lubricating and grinding system for a controllable jet. An electrostatic nozzle includes a nozzle core, an upper nozzle body being connected above the nozzle core; an empty space being formed between the upper nozzle body and the nozzle core for storing compressed air and decompression; a lower nozzle body being connected below the nozzle core; a gas-liquid mixing chamber, an acceleration chamber, and a nozzle outlet being sequentially disposed inside the nozzle core from top to bottom; and micro-convex bodies being evenly arranged on an inner wall of the acceleration chamber.

Abstract: A method for preparing a nanohybrid used for ratiometric fluorescence and ratiometric electrochemical sensing simultaneously is provided. Surface-aminated (—NH2) SiO2 nanospheres encapsulating an electroactive material A or B are prepared and conjugated with surface-carboxylated (—COOH) carbon dots (CDs) or gold nanoclusters (AuNCs) to prepare a conjugate, and the conjugate is conjugated with a DNA aptamer terminated with —NH2. Ions or biomolecules are added to two types of DNA-conjugate dispersions, and ratiometric florescence sensing is realized by fitting the linear relationship between ratiometric fluorescent peak intensity ICDs/IAuNCs and a specific ion concentration or a specific biomolecule concentration.

Abstract: A method for preparing a nanohybrid used for ratiometric fluorescence and ratiometric electrochemical sensing simultaneously is provided. Surface-aminated (—NH2) SiO2 nanospheres encapsulating an electroactive material A or B are prepared and conjugated with surface-carboxylated (—COOH) carbon dots (CDs) or gold nanoclusters (AuNCs) to prepare a conjugate, and the conjugate is conjugated with a DNA aptamer terminated with —NH2. Ions or biomolecules are added to two types of DNA-conjugate dispersions, and ratiometric florescence sensing is realized by fitting the linear relationship between ratiometric fluorescent peak intensity IcDs/IAuNcs and a specific ion concentration or a specific biomolecule concentration.

Abstract: A method and apparatus for mass production of AR diffractive waveguides. Low-cost mass production of large-area AR diffractive waveguides (slanted surface-relief gratings) of any shape. Uses two-photon polymerization micro-nano 3D printing to realize manufacturing of slanted grating large-area masters of any shape (thereby solving the problem about manufacturing of slanted grating masters of any shape on the one hand, realizing direct manufacturing of large-size wafer-level masters on the other hand, and also having the advantages of low manufacturing cost and high production efficiency). Composite nanoimprint lithography technology is employed (in combination with the peculiar imprint technique and the composite soft mold suitable for slanted gratings) to solve the problem that a large-slanting-angle large-slot-depth slanted grating cannot be demolded and thus cannot be manufactured, and realize the manufacturing of the slanted grating without constraints (geometric shape and size).

Abstract: A method for measuring corrosion-expansion force during cracking of concrete due to corrosion and expansion of reinforcing steel; wherein, deformation on a surface of reinforced concrete is photographed based on a digital image correlation (DIC) method, a full-field displacement and a full-field strain on a surface of the concrete are analyzed and calculated, a relationship between corrosion-expansion force and the strain on the surface of the concrete is found through an established theoretical model, and corrosion-expansion force of reinforcing steel and a change rule of the corrosion-expansion force are calculated. Therefore, the method is simple and includes with safe and reliable operations, scientific principles, and low costs, so that a change in corrosion-expansion force during corrosion and expansion of reinforced concrete can be monitored in real time.

Abstract: A circuit structure of a voltage type single-stage multi-input low-frequency link inverter with an external parallel-timesharing select switch is formed by connecting a plurality of input filters connected to ground and a common output low-frequency isolation voltage-transformation filter circuit through a multi-input single-output high-frequency inverter circuit. Each input end of the multi-input single-output high-frequency inverter circuit is connected to an output end of each of the input filters in a manner of one-to-one correspondence. An output end of the multi-output single-input high-frequency inverter circuit and the output low-frequency isolation voltage-transformation filter circuit are connected. The multi-input single-output high-frequency inverter circuit includes an external multi-path parallel-timesharing select four-quadrant power switch circuit and a bidirectional power flow single-input single-output high-frequency inverter circuit successively connected in cascade.

Abstract: A method for preparing an upconversion-luminescence flexible hybrid membrane for visual detection of tumor markers is provided. Metal ion doped black phosphorus quantum dots (M-BPQDs) are prepared by adopting ultrasonic and solvothermal processes; mesoporous SiO2 grows on the surfaces of the M-BPQDs and amination modification is performed; the M-BPQDs are connected with carboxylated single-stranded DNA1; receptor molecules enter pores; single-stranded DNA2 aptamers and the DNA1 are combined due to base complementation to encapsulate receptors in the pores; and an M-BPQDs probe is prepared. DNA1 terminal-SH and a composite membrane are formed by assembling polymethyl methacrylate-polyimide-gold nanoparticles in a layer-by-layer manner bound by Au—S bonds, and the membrane and the probe are connected to construct the flexible hybrid membrane. The new flexible hybrid membrane is simple and inexpensive to prepare and is highly sensitive.