Abstract: A vehicle-mounted in-situ magnetic field decontamination device for heavy metal contaminated soil with a retractable baffle is provided and includes a mounting frame, a plurality of magnetic rods circumferentially move along the mounting frame, the mounting frame and a lifting regulator are hinged with an agricultural machinery frame body, and an upper end of the mounting frame is supported by the lifting regulator. A magnetic particle recovery assembly is arranged below the upper end of the mounting frame. A retractable baffle assembly includes baffle springs and non-magnetic baffles, which each sleeve a corresponding magnetic rod. A turn-over channel for the retractable baffle assembly to move is provided at a middle part of mounting frame. Compression flaps are provided at both sides of turn-over channel, and an ejection flare for the ejection of the non-magnetic baffles is formed between free ends of the compression flaps at both sides.

Abstract: An imaging assembly includes a first lens, a second lens, and a third lens. The imaging assembly satisfies the following relational expressions: 0.9<|f2/f|<2.4 and 0.23<?11/TTL<0.45. The illumination and projection apparatus includes the imaging assembly, a housing with a light inlet and a light outlet, and an illumination assembly disposed in a first accommodating space of the housing. The imaging assembly is clamped in a second accommodating space of the housing. The imaging assembly blocks the light outlet, and the illumination assembly blocks the light inlet, which improves sealing performance of the illumination and projection apparatus. An aperture of the second accommodating space is smaller than an aperture of a first accommodating space, which facilitates installation of the imaging assembly and the illumination assembly, and improves convenience of installing the illumination and projection apparatus.

Abstract: A Phyllobacterium myrsinacearum strain N1N2-2 for efficient degradation of diphenylarsinic acid (DPAA) and use thereof are provided, relating to the technical field of microorganisms. The Phyllobacterium myrsinacearum strain N1N2-2 shows high tolerance and degradation efficiency to the DPAA, provides a microbial strain resource for the remediation and treatment of DPAA-contaminated soil and water environments, and has broad application prospects.

Abstract: A Phyllobacterium myrsinacearum strain N1N2-2 for efficient degradation of diphenylarsinic acid (DPAA) and use thereof are provided, relating to the technical field of microorganisms. The Phyllobacterium myrsinacearum strain N1N2-2 shows high tolerance and degradation efficiency to the DPAA, provides a microbial strain resource for the remediation and treatment of DPAA-contaminated soil and water environments, and has broad application prospects.

Abstract: Provided is a preparation system with rotary valves for magnetic particles for heavy metal contamination reduction and remediation of contaminated farmland soil. A raw material modifying tank and a mixed liquid pre-stirring tank are respectively in communication with a mixed liquid preparation tank. The mixed liquid preparation tank, a mixed liquid degassing tank and a dropping device are serially connected in sequence. A magnetic particle solidification device is arranged below the dropping device. Rotary valve cavities, and a piston mounting seat with piston cavities are arranged inside a dropping seat body of the dropping device. The rotary valves are rotatably arranged in the rotary valve cavities. Material sucking pipes and material passing pipes axially perpendicular to the material sucking pipes are arranged inside each of the rotary valves. A dropping plate with feeding pipes and dropping holes are arranged below the rotary valve cavities.

Abstract: The present application discloses an optical system, a camera module, and a terminal device. The optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has negative refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has refractive power, the fifth lens has refractive power, and the sixth lens has refractive power. The optical system satisfies the following relational expression: 1.2<IMGH/EPD<1.4. Wherein, IMGH is half of an image height corresponding to a maximum field of view of the optical system, and EPD is an entrance pupil diameter of the optical system. The optical system of the present application may have large aperture and high imaging quality while maintaining a lightweight and compact design.

Abstract: Provided are a mercapto group-loaded layered double hydroxide (LDH)-based magnetic composite particle, and a preparation method and use thereof. The method includes: dissolving a water-soluble divalent magnesium salt and a water-soluble trivalent aluminum salt in water to obtain a mixed salt solution; pumping ammonia water into the mixed salt solution, and performing reaction I under stirring, subjecting an obtained product to centrifugation, and washing product obtained with deionized water; mixing the product with water, ethanol, and a coupling agent KH-580 to obtain a mixture, subjecting the mixture to reaction II while stirring to obtain mercapto group-loaded LDH; mixing the mercapto group-loaded LDH with ferroferric oxide and sodium alginate, adding deionized water thereto, and stirring to obtain a homogeneous mixed solution; adding the homogeneous mixed solution into a calcium chloride solution dropwise to form a magnetic bead; and leaving the magnetic bead to harden, and then washing and drying.

Abstract: A model for predicting bioavailability of arsenic in site soil and a construction method and an application thereof, includes steps of: leveling soil after selecting a measuring point, vertically placing a measuring sleeve, fully supplying water to site soil to be measured, balancing for 20-40 min, measuring a water content in a soil volume not less than 40%, placing a piston DGT device into the measuring sleeve and pressing the device into soil, covering a top of the measuring sleeve with a wind shield, cleaning the piston DGT device after the measurement, analyzing a concentration of available arsenic by ICP-MS, and measuring available arsenic of soil; linearly fitting the available arsenic measured by a DGT method with human bioavailable arsenic measured by a UBM method, and obtaining a model for predicting bioavailability of arsenic in site soil.

Abstract: A vehicle-mounted in-situ magnetic field decontamination device for heavy metal contaminated soil with a retractable baffle is provided and includes a mounting frame, a plurality of magnetic rods circumferentially move along the mounting frame, the mounting frame and a lifting regulator are hinged with an agricultural machinery frame body, and an upper end of the mounting frame is supported by the lifting regulator. A magnetic particle recovery assembly is arranged below the upper end of the mounting frame. A retractable baffle assembly includes baffle springs and non-magnetic baffles, which each sleeve a corresponding magnetic rod. A turn-over channel for the retractable baffle assembly to move is provided at a middle part of mounting frame. Compression flaps are provided at both sides of turn-over channel, and an ejection flare for the ejection of the non-magnetic baffles is formed between free ends of the compression flaps at both sides.

Abstract: An imaging assembly includes a first lens, a second lens, and a third lens. The imaging assembly satisfies the following relational expressions: 0.9<|f2/f|<2.4 and 0.23<?11/TTL<0.45. The illumination and projection apparatus includes the imaging assembly, a housing with a light inlet and a light outlet, and an illumination assembly disposed in a first accommodating space of the housing. The imaging assembly is clamped in a second accommodating space of the housing. The imaging assembly blocks the light outlet, and the illumination assembly blocks the light inlet, which improves sealing performance of the illumination and projection apparatus. An aperture of the second accommodating space is smaller than an aperture of a first accommodating space, which facilitates installation of the imaging assembly and the illumination assembly, and improves convenience of installing the illumination and projection apparatus.