Abstract: The invention relates to a Novosphingobium sp. SJB007 and an application thereof in removal of phosphorus from wastewater, belonging to the technical field of environmental microorganisms. One aspect of the invention provides a Novosphingobium sp. SJB007 with an access number of CGMCC (China General Microbiological Culture Collection Center) No. 21177. Another aspect of the invention provides an application of the Novosphingobium sp. SJB007 in removal of phosphorus from wastewater. The efficient phosphorus-accumulating strain Novosphingobium sp. SJB007 provided by the invention has a high removal rate of more than 97% when the concentration of phosphorus in the wastewater is 10-30 mg/L under an appropriate condition.

Abstract: A method for assembling a dual-head pulling rod involves attaching pulling heads to two ends of a rod body through threaded connection using a system that includes a foundation, on which a rod dispensing device, an inclined guiding plate, a conveying flap, a head dispensing device, a head mounting unit, a clamping device, an assembling device and a V-shaped output channel are provided. The inclined guiding plate is inclined and uses its ramp to guide a rod body falling thereon. The conveying flap is swingable between an input position and an output position. The conveying flap at the input position receives the rod body coining from the inclined guiding plate and outputs the rod body to the clamping device.

Abstract: A strong and weak hybrid PUF circuit comprises N switch units and an arbiter. Each switch unit consists of two delay modules and two 2:1 multiplexers. The N switch units constitute two completely symmetrical delay paths. Each delay module consists of six stages of delay cells. During the operating process, a transmission signal selects a turn-on path of the corresponding 2:1 multiplexers according to activation signals; the switch units in the PUF circuit are in a valid state (if the delay modules are turned on) or in an invalid state (if the delay modules are not turned on) according to whether the delay modules are turned during the operating process; and the strong and weak hybrid PUF circuit can be flexibly configured to be of two different types (a strong PUF circuit and a weak PUF circuit) according to changes of the Hamming weight of input activation signals.

Abstract: A control flow attacks based on return address signatures comprises: using a return address as a push return address when a response is given to an interrupt service routine; generating an encrypted push return address by an XOR encryption circuit by means of an n-bit binary key generated by a pseudo random number generator; then, generating a push_address signature value by an MD algorithm signature circuit; when the response to the interrupt service routine is over, reading an n-bit binary address out of a stack to serve as a pop return address; generating an encrypted pop return address by the XOR encryption circuit; generating a pop address signature value by the MD algorithm signature circuit; comparing the push_address signature value with the pop address signature value; and determining whether or not a data processor is under a control flow attack according to a comparison result.

Abstract: The present invention provides an optimizing growth method for improving quality of MOCVD epitaxial thin films, including the following method: step 1, putting a substrate and a thin film A to a reaction chamber of an MOCVD equipment; and feeding a compound containing an element X as an X source under the condition that the reaction chamber is filled with H2; configuring a temperature, reaction chamber pressure and deposition time within a parameter range where the gaseous compound can decompose X atoms; pre-depositing an X atomic layer on a surface of the substrate or the thin film A; the X atomic layer is adsorbed on the substrate or thin film A at this time; and the X atomic layer can be reacted with other compounds to generate a thin film B component in the follow-up process, or can directly form a thin film B component with the thin film A.

Abstract: The present invention provides an online laser leveling detection method of a 3D printer. The method comprises: (1), arranging a bar-shaped triangular reflecting prism and a bar-shaped photoelectric receiver; (2), fixedly mounting a laser emitter and a plane mirror on the side face of a printer head; (3), with the aid of a detection laser beam, fine tuning the mounting azimuths of an X-axis guide rail, a Y-axis guide rail, and the printer head till the motion levelness of the printer head is adjusted to meet requirements of the design accuracy of the printer; (4), with the aid of the detection laser beam, fine tuning the mounting azimuth of a printing platform till the mounting levelness of the printing platform is adjusted to meet the requirements of the design accuracy of the printer; (5), starting the 3D printing program; (6), in the printing process, detecting in real time whether a nozzle of the printer head generates faults including material blockage, shortage, and breakage.

Abstract: A system synchronization method includes: connecting synchronization modules of a plurality of devices together through a synchronization bus. The synchronization modules include a signal generation module, a switch control module, a synchronization bus monitoring module, and a switch S1. A signal output terminal of the signal generation module is connected to a first terminal of the switch S1, and a timing overflow terminal of the signal generation module is connected to the switch control module configured to control the switch S1. The switch control module is connected to the synchronization bus monitoring module. A second terminal of the switch S1 is connected to the switch control module and the synchronization bus monitoring module. The system synchronization method has the advantages of simple structure, low cost, high reliability, and good practicability.

Abstract: A device for extracting polysaccharide from acaudina molpadioides is provided, which includes a mixing box, a blocking cover, a feed pipe group, a discharge pipe, a bottom plate, a side plate, a first motor, a first transmission shaft, two drive shafts, a first circular gear, two second circular gears, two rotary discs, two connecting frame groups, two semiarc rotary discs, a slide bar, a stop collar, a fixed link, a baffle, a first bushing group and a first sleeve spring group. A top side wall and a rear lower side of the mixing box are communicated with the feed pipe group and the discharge pipe, respectively. Front side and rear sides of the slide bar are longitudinally connected with multiple first engaging teeth. Both the two semiarc rotary discs are connected with multiple second engaging teeth. The fixed link is connected between the stop collar and the slide bar.

Abstract: The present disclosure discloses a monitoring device for internal deformation and fine particle loss of a railway subgrade, relating to the field of monitoring devices. The monitoring device includes an internal damage monitoring device arranged in a subgrade ballast layer. The internal damage monitoring device is connected to a resistance acquisition instrument through a wire. The resistance acquisition instrument is in wireless connection with a resistance signal receiver. The monitoring device for internal deformation and fine particle loss of a railway subgrade provided by the present disclosure can remotely realize real-time continuous monitoring of the deformation and fine particle loss inside the railway subgrade under a rail transit load, is economical and convenient, and has high practice value.

Abstract: Disclosed is a combined treatment method for improving corrosion resistance of metal component in chlorine-containing solution. First, the metal component is placed in the chlorine-containing solution. Large-area overlapping laser shock peening without an absorbing layer is used, when laser pulses are irradiated on the target metal component, the metal matrix surface absorbs the laser energy, vaporizes and expands to form a high-temperature and high-pressure plasma, a chlorine-containing passivation film is formed, to improve the surface corrosion resistance of the metal component. After that, the surface layer of the metal component is subjected to surface polishing, followed by large-area overlapping laser shock peening with an absorbing layer at room temperature, to further improve the corrosion resistance of the metal component.

Abstract: A method for integrated optimization of a ternary FPRM circuit comprises: establishing an area estimation model, a power consumption estimation model and a delay estimation model of a ternary FPRM circuit under a p polarity; constructing a correlation between a multi-objective teaching-learning optimization algorithm and optimization of an area, power consumption and a delay of the ternary FPRM circuit; expressing positions of the individuals in the multi-objective teaching-learning optimization algorithm as polarities of the ternary FPRM circuit, and expressing a search space as a space for polarity selection of the ternary FPRM circuit; and finally, searching for a set of Pareto optimum polarity solution for the area, power consumption and delay of the ternary FPRM circuit by means of the multi-objective teaching-learning optimization algorithm to complete the optimization of the area, power consumption and delay for the ternary FPRM circuits.

Abstract: A drilling device with a controllable femtosecond laser processing taper includes a femtosecond laser and a precision motion table. A support mechanism is provided along the central axis of the precision motion table, and a clamp is provided on the top of the support mechanism. The output end of the femtosecond laser is provided with a beam expander. The output end of the beam expander is provided with a reflection mirror. The output end of the reflection mirror is provided with a beam scanning module. The output end of the beam scanning module is provided with a semi-focusing mirror. The output end of the semi-focusing mirror is provided with a semi-transmissive reflection mirror arranged at 45 degrees. The reflection output end of the semi-transmissive reflection mirror is provided with a high-precision three-dimensional on-line monitoring module, and the transmission output end of the semi-transmissive reflection mirror faces the clamp.

Abstract: Disclosed is a combined treatment method for improving corrosion resistance of metal component in chlorine-containing solution. First, the metal component is placed in the chlorine-containing solution. Large-area overlapping laser shock peening without an absorbing layer is used, when laser pulses are irradiated on the target metal component, the metal matrix surface absorbs the laser energy, vaporizes and expands to form a high-temperature and high-pressure plasma, a chlorine-containing passivation film is formed, to improve the surface corrosion resistance of the metal component. After that, the surface layer of the metal component is subjected to surface polishing, followed by large-area overlapping laser shock peening with an absorbing layer at room temperature, to further improve the corrosion resistance of the metal component.

Abstract: The present invention provides an online laser leveling detection method of a 3D printer. The method comprises: (1), arranging a bar-shaped triangular reflecting prism and a bar-shaped photoelectric receiver; (2), fixedly mounting a laser emitter and a plane mirror on the side face of a printer head; (3), with the aid of a detection laser beam, fine tuning the mounting azimuths of an X-axis guide rail, a Y-axis guide rail, and the printer head till the motion levelness of the printer head is adjusted to meet requirements of the design accuracy of the printer; (4), with the aid of the detection laser beam, fine tuning the mounting azimuth of a printing platform till the mounting levelness of the printing platform is adjusted to meet the requirements of the design accuracy of the printer; (5), starting the 3D printing program; (6), in the printing process, detecting in real time whether a nozzle of the printer head generates faults including material blockage, shortage, and breakage.

Abstract: A true random number generator with a dynamic compensation capacity comprises a loop control logic, a shift register, a sensitive amplifier and a load matching unit. The sensitive amplifier comprises a first PMOS transistor, a second PMOS transistor, a third PMOS transistor, a fourth PMOS transistor, a first NMOS transistor, a second NMOS transistor and two NMOS arrays. Each NMOS array comprises a third NMOS transistor, a fourth NMOS transistor, a fifth NMOS transistor, a sixth NMOS transistor, a seventh NMOS transistor, an eighth NMOS transistor, a ninth NMOS transistor, a tenth NMOS transistor, an eleventh NMOS transistor, a twelfth NMOS transistor and a thirteenth NMOS transistor. The load matching unit comprises a first D flip-flop and a second D flip-flop and is connected at an output terminal and an inverted output terminal of the sensitive amplifier. The true random number generator has the advantages of simple feedback regulation and high robustness.

Abstract: A control flow attacks based on return address signatures comprises: using a return address as a push return address when a response is given to an interrupt service routine; generating an encrypted push return address by an XOR encryption circuit by means of an n-bit binary key generated by a pseudo random number generator; then, generating a push_address signature value by an MD algorithm signature circuit; when the response to the interrupt service routine is over, reading an n-bit binary address out of a stack to serve as a pop return address; generating an encrypted pop return address by the XOR encryption circuit; generating a pop address signature value by the MD algorithm signature circuit; comparing the push_address signature value with the pop address signature value; and determining whether or not a data processor is under a control flow attack according to a comparison result.

Abstract: A true random number generator with stable node voltage comprises a loop control logic, two inverters identical in structure, two D flip-flops identical in structure, a first PMOS transistor, a second PMOS transistor, a first NMOS transistor, a monitoring module and a post-processing module. Each inverter comprises a second NMOS transistor, a third NMOS transistor, a fourth NMOS transistor, a fifth NMOS transistor, a sixth NMOS transistor, a seventh NMOS transistor, an eighth NMOS transistor, a ninth NMOS transistor, a tenth NMOS transistor, a third PMOS transistor, a fourth PMOS transistor, a fifth PMOS transistor, a sixth PMOS transistor, a seventh PMOS transistor, an eighth PMOS transistor, a ninth PMOS transistor, a tenth PMOS transistor and an eleventh PMOS transistor. The true random number generator has the advantages of being able to eliminate the capacitive coupling effect and has high randomness.

Abstract: A method for synthesizing a chiral ?-hydroxy acid ester compound is disclosed. The method includes the steps of: using an aldehyde compound and a monoalkyl malonate as raw materials, using a metal and a chiral ligand as a catalyst to make the raw materials be directly and fully reacted in an organic solvent and form a reaction solution, and separating and purifying the reaction solution to obtain the highly stereoselective ?-hydroxy acid ester compound. The beneficial effects are mainly embodied in: 1. simple operation; 2. rapidly constructing a highly stereoselective ?-hydroxy acid ester skeleton structure molecule; 3. high reaction yield and good stereoselectivity. Therefore, the invention has high basic research significance, industrial production value and social economic benefit.

Abstract: The present invention discloses a large-current power supply and a constant-current control method and system thereof. The large-current power supply provided by the present invention includes: a primary power supply, an energy-feedback circuit and a direct-current (DC) large-current generator; the energy-feedback circuit includes a freewheel diode and a magnetic reset winding; and a secondary coil of the DC large-current generator is connected to a load. Without an output rectifier diode and a filter capacitor at a load end of the large-current power supply provided by the present invention, the power consumption problem of the output rectifier diode at a large current is unnecessarily considered, and an electrolytic capacitor does not need to be used for filtration; and therefore, the service life of the power supply is greatly prolonged, a larger current is output easily by extending, and the power supply has the advantages of simple circuit, small size, easy control and high working reliability.

Abstract: The present invention discloses a quick start control method and system for a Buck circuit. According to the control method and system provided by the present invention, by controlling a duty ratio of a switch of the Buck circuit within an initial start time period, i.e., a total-on (Ton) time period, at 1, an output voltage can rise at a fastest rate and a capacitor can be charged; and then, by controlling the duty ratio of the switch of the Buck circuit within a Toff time period at 0, the output voltage keeps to rise and simultaneously is stabilized at an expected value. With the adoption of the control method and system provided by the present invention, the overshoot and oscillation caused by the output voltage in a start process of the Buck circuit can be effectively reduced, and the start time of the Buck circuit is shortened.