8results about How to "Optimize the extraction process" patented technology

The invention provides a detection method and application of amphoteric and cationic perfluorinated and polyfluoroalkyl compounds, the method optimizes an extraction agent, can more comprehensively detect, qualitatively and quantitatively analyze amphoteric and cationic PFAS in solid samples such as biological solids, soil and the like, has high accuracy and detection precision, and can be widely applied to detection of amphoteric and cationic perfluorinated and polyfluoroalkyl compounds. The amphoteric and cationic PFAS with more unknown structures can be identified and analyzed, the blank of the prior art in the aspect of extracting and detecting amphoteric and cationic perfluorinated and polyfluoroalkyl compounds is filled, the occurrence level and fate-to-transition behavior of the amphoteric and cationic PFAS in the environment can be accurately analyzed, traditional and novel amphoteric and cationic PFAS in the environment can be identified, and the detection accuracy of the amphoteric and cationic perfluorinated and polyfluoroalkyl compounds is improved. And a scientific basis is provided for new pollutant treatment in China.

This invention relates to the technical field of plastic recycling, and more particularly to a centralized processing device for polyethylene waste, comprising side plates, a first connecting plate, a first hydraulic telescopic cylinder, a second connecting plate, limiting rods, an extrusion assembly, and a drive assembly; several side plates are connected to a support block; a first connecting plate is disposed above the support block; a first hydraulic telescopic cylinder is fixedly connected to the first connecting plate; the telescopic end of the first hydraulic telescopic cylinder is fixedly connected to the second connecting plate; several limiting rods are fixedly connected to the second connecting plate; under the limiting action of the limiting rods, four through holes are formed inside the film block package. After inserting a PE tube into the through holes, the heat in the film block package can diffuse to the inside of the PE tube, and then diffuse from the inside of the PE tube to the external environment, avoiding heat accumulation and spontaneous combustion. At the same time, the limiting rods are also used to fix the middle of the film block package, preventing the film block package from shifting during the opening of the side plates, thereby avoiding affecting the gripping and positioning operation of the robotic arm.

The utility model discloses a fire-fighting steel chisel anchor point recovery device which comprises a straight hand lever, a rotatable U-shaped clamping piece is arranged at the front end of the straight hand lever, and the opening direction of the U-shaped clamping piece is perpendicular to the straight hand lever; a supporting rod is further included, a rotatable sleeve is arranged at the top end of the supporting rod, the straight hand rod is sleeved with the sleeve in a penetrating mode and fastened through a T-shaped screw, and a base is arranged at the bottom of the supporting rod. The base comprises a ball groove and a bottom plate which are fixed into a whole, and a ball head is arranged at the bottom end of the supporting rod and rotates in the ball groove. And the sleeve is provided with two T-shaped screw rods which are in threaded connection. And the rotating surfaces of the U-shaped clamping piece and the sleeve are overlapped. Compared with the prior art, the steel chisel pulling-out device has the advantages that the straight hand rod is connected with the supporting rod in a lever mode, the fulcrum can be adjusted, the base can adapt to uneven terrains, operation is labor-saving, a steel chisel can be pulled out quickly and easily, and the workload of firemen is reduced.

The utility model belongs to the technical field of tunnel primary support detection equipment, and particularly relates to a detection hole reserving device for tunnel primary support detection, which comprises a mounting seat, a steel arch frame, a straight pipe, geotechnical cloth and a fixing component, the mounting seat is detachably connected with the steel arch frame, and the two ends and the outer wall of the straight pipe are wrapped with multiple layers of geotechnical cloth. The straight pipe is arranged on one side of the steel arch frame, the two ends of the straight pipe extend out of the front surface and the rear surface of the steel arch frame correspondingly, and the straight pipe wrapped by the geotechnical cloth is fixed to the mounting base through the fixing assembly; the inner channel of the straight pipe or the cavity formed after the straight pipe is pulled out is the preformed hole for tunnel primary support cavity detection, the treatment procedure after concrete spraying is completed can be simplified, the straight pipe is wrapped with the geotechnical cloth, the structure is simple, installation is convenient, impurities such as silt and chippings in the concrete spraying process can be prevented from entering the inner channel of the straight pipe, and the construction efficiency is improved. Excellent water permeability is achieved, and drainage of the inner wall of the tunnel is facilitated.

The objective of this invention is to provide a steering wheel that allows the driver to easily remove their fingers from a hole provided in the connecting portion, even if the driver's fingers become stuck in the hole. A hub is fixed to the steering shaft. Furthermore, when viewed axially along the hub, a rim portion for the driver to grip is disposed on the outer periphery of the hub, and the hub and rim portion are connected by a connecting portion. Holes with openings on the front side of the steering wheel are provided in the left and right connecting portions. The left and right connecting portions have inclined surfaces on the inner peripheral surfaces forming the holes, and these inclined surfaces are inclined such that the holes enlarge as they face the front side.

The utility model discloses a two-wheeled vehicle transportation quick-assembly self-locking tensioning and fastening device, including footstep hanging seat, pull handle assembly, long quick-release safety pin and short quick-release safety pin, footstep hanging seat includes insertion part and connecting portion, and insertion part is equipped with first insertion hole, and connecting portion is equipped with second insertion hole, pull handle assembly includes pull assembly and handle assembly, and one end of pull assembly is hinged with handle assembly, and pull assembly is equipped with pull clamping, and handle assembly is hinged with connecting portion, and handle assembly is equipped with third insertion hole, long quick-release safety pin can be detachably inserted into first insertion hole, the position of pull assembly and handle assembly hinged and the position of handle assembly and connecting portion hinged are interval arrangement, handle assembly has opening state position and closed state position relative to connecting portion, and short quick-release safety pin can be detachably inserted into second insertion hole and third insertion hole in closed state position, is used for quick fixed connection two-wheeled vehicle and is quick to release the state of being taut when disassembling.

The application discloses a kind of for mathematical formula identification and extraction method and system, method includes: obtaining input original text data;The original text data is preprocessed, and the text information after preprocessing is obtained;Formula identification extraction method is used to extract mathematical formula to the text information after preprocessing, and extraction result is obtained;Output extraction result.The method can accurately improve the accuracy and adaptability of mathematical formula extraction, and extraction efficiency is high, improve the efficiency of processing a large amount of text.