Abstract: A computer-vision-based safety monitoring and early warning method and system for a transmission line. The method includes: acquiring a scene image of the transmission line; identifying a transmission channel area and dynamic targets on the scene image; determining an interference result between the dynamic targets and the transmission channel area based on an identification result of the transmission channel area and the dynamic targets, specifically including: overlapping and comparing trajectory information of the dynamic targets with the transmission channel area to give an overlapping result; based on the overlapping result, screening out a dynamic target of which the trajectory information overlaps with the transmission channel area; and determining alarm information based on the interference result.

Abstract: The present disclosure provides a GalNAc monomer comprising a ribose ring or a derivative structure thereof and a use thereof in liver-targeted delivery of small nucleic acid drugs. Specifically provided is a compound of formula (I) or a pharmaceutically acceptable salt thereof. The GalNAc-conjugated oligonucleotide prepared from the GalNAc compound provided by the present disclosure can achieve efficient liver-targeted delivery and enhance drug efficacy.

Abstract: A handheld electric sprayer with a negative-pressure soft liquid bag includes a sprayer body, wherein a motor and a plunger pump assembly are arranged in the sprayer body, a transmission mechanism rotatably connected with the motor is arranged in the sprayer body, a slider is arranged between the transmission mechanism and the plunger pump assembly, and limiting parts are arranged between the slider and the sprayer body; the plunger pump assembly includes a piston rod, and when the motor drives the transmission mechanism to rotate, the slider drives the piston rod to stretch and retreat; a storage device detachably is arranged on an outer side of the sprayer body, and the storage device is connected with the plunger pump assembly; and a pressure relief device is arranged on the plunger pump assembly, and a return passage is arranged between the pressure relief device and the storage device.

Abstract: Provided are compounds and salts having a structure of Formula (I) or (II): (I), and (II) wherein: both of the chiral carbon atoms denoted by “*” are both in the R configuration or both in the S configuration. Compounds and salts of Formulae (I) and (II) are useful in the preparation of enantiomerically pure amino acids. Conversion of amino acids to D-form from any of L-form, racemate or other enantiomerically impure mixtures or conversion of amino acids to L-form from any of D-form, racemate or other enantiomerically impure mixtures is disclosed.

Abstract: A permeable cement stone fracturing exploitation method for non-conventional oil and gas layer comprising the following processes: transporting and storing a supercritical carbon dioxide to a well site; selecting, transporting, and storing an oil well cement and admixtures to the well site; mixing the oil well cement and the admixtures into a first mixture, forming a cement slurry; pumping the supercritical carbon dioxide and the cement slurry respectively into a high pressure mixer; automatically mixing the supercritical carbon dioxide and the cement slurry into a second mixture by the high pressure mixer; continuously on-line monitoring and temporarily storing the second mixture; and injecting the second mixture into the non-conventional oil and gas layer for fracturing to form a reticulate artificial fracture; the second mixture is automatically heated, pressure reduced, gasified, solidified, carbonic acid dissolved and eroded, leached to form the a permeable cement stone.

Abstract: Disclosed is a permeable cement stone fracturing exploitation method for non-conventional oil and gas layer such as tight oil and gas, shale gas, coal-bed gas, combustible ice and so on. The method comprises the following complementary processes and embodiments: transporting, storing and pumping process for supercritical carbon dioxide; transporting, storing, preparing and pumping process for fracturing cement slurry; process for mixing the supercritical carbon dioxide and the cement slurry; process of fracturing the supercritical carbon dioxide and the cement slurry on ground; process of forming a permeable cement stone under the ground; and so on.