42results about How to "Environmental impact factors are small" patented technology

The invention provides a carbon quantum dot fluorescent microsphere standard substance, which is composed of aminated polystyrene microspheres and fluorescent substances loaded on the surface of the aminated polystyrene microspheres, and the fluorescent substance is carboxylated carbon quantum dots. The present invention also provides a method for preparing the carbon quantum dot fluorescent microsphere standard substance, comprising the steps of: (1) preparation of polystyrene microspheres; (2) preparation of nitrolated polystyrene microspheres; ( 3) Preparation of aminated polystyrene microspheres; (4) Preparation of carboxylated graphene quantum dots; (5) Preparation of standard substances of carbon quantum dot fluorescent microspheres. The carbon quantum dot fluorescent microsphere standard substance prepared by the present invention has the characteristics of not easy to fall off the fluorescence, short reaction time, long fluorescence activity, etc.; the particle size is uniform, strictly monodisperse, and has excellent stability; the method of the present invention is simple and can be operated at room temperature. The environmental impact factors are small and the cost is low, which is of great significance for the study of fluorescent standard substances.

The invention provides a frost-weathering construction method of channel lining concrete. The frost-weathering construction method comprises the following steps of: leveling a concrete surface; vibrating the concrete by using a plate vibrator until grout is formed on the surface; removing excess water in the concrete by using a vacuum hydro-exhaustion machine; stopping the vacuum hydro-exhaustion machine; revibrating the concrete by using the plate vibrator; revibrating the concrete to extract the grout before the initial condensation of the concrete; manually plastering to finish the surface; covering a moisturizing film on the surface; heating and maintaining the concrete surface by adopting a mobile infrared ray heating beam; and watering to moisturize and maintain the concrete surface so as to complete the frost-weathering construction of the channel lining concrete of the channel. The frost-weathering construction method is applicable to the channel lining concrete with large area and thin thickness; and when the frost-weathering construction method is adopted, both frost thawing resistance and frost heaving resistance of the channel lining concrete can be improved, the time of peeling the frosted surface of the concrete can be prolonged, and compactness and strength of the concrete can also be increased; and moreover the frost-weathering construction method has the advantages of simplicity in operation as well as low difficulty and quickness in construction, can be used for greatly accelerating the construction progress, and is slightly affected by environmental factors as a construction process in a special season.