6results about How to "Improve precipitation efficiency" patented technology

The construction method comprises the following steps that when a foundation pit is excavated, temporary drainage ditches and water-collecting wells are arranged, the drainage ditches are arranged on the periphery of the bottom of the foundation pit, one water-collecting well is arranged at each corner of the drainage ditches, and drainage pumps are arranged in the water-collecting wells to pump and drain water; after excavation of the slope of the foundation pit is completed, an intercepting ditch and a top drainage well are arranged at the top of the foundation pit; the drainage ditches and the water collecting wells are staggered in the width direction; auxiliary drainage wells are excavated at the corners of the drainage ditches, auxiliary drainage pumps are arranged in the auxiliary drainage wells, and the auxiliary drainage wells are communicated with the parts, outside the distribution range of the water collecting wells, of the drainage ditches; continuously pumping water during the construction period of the inner side of the foundation pit until the dead weight of the building is greater than the buoyancy generated by underground water. The problem that existing foundation pit surface drainage precipitation is insufficient in drainage capacity when coping with working conditions such as heavy rainfall can be solved.

This invention provides an ultra-high strength, low density Al-Mg-Zn-Sc-Zr-based alloy and its preparation method, belonging to the field of aluminum alloy material technology. The ultra-high strength, low density Al-Mg-Zn-Sc-Zr-based alloy provided by this invention, by mass fraction, has the following chemical composition: Mg 3.0~8.0%, Zn 1.0~5.0%, Cu 0.4~1.0%, Mn 0.1~0.8%, Ag 0.05~0.3%, Sc 0.01%~0.3%, Zr 0.05~0.3%, with the balance being Al. This invention achieves this by precisely controlling the elemental ratios of Mg, Zn, Cu, and Ag, resulting in an alloy that maintains its low density while exhibiting a strong age-hardening effect. Simultaneously, the reasonable addition of trace elements such as Mn, Sc, and Zr enables the alloy to possess a dispersion strengthening effect. Combined with heat treatment and hot deformation processes, this further improves the strength and ductility of the aluminum alloy.

The invention relates to the technical field of foundation pit construction, in particular to a pipe-in-pipe double-layer filter material artesian well dewatering structure and a construction method.The pipe-in-pipe double-layer filter material artesian well dewatering structure comprises a first filter pipe, a second filter pipe, a first filter material layer and a second filter material layer, first water permeable holes are formed in the first filter pipe at intervals, and second water permeable holes are formed in the second filter pipe at intervals; the periphery of the second filter pipe is sleeved with the first filter pipe, an avoiding distance is formed between the first filter pipe and the side wall of the precipitation drill hole, the space between the side wall of the precipitation drill hole and the first filter pipe is filled with the first filter material layer, an avoiding distance is formed between the first filter pipe and the second filter pipe, and the space between the first filter pipe and the second filter pipe is filled with the second filter material layer; the diameter of the coarse filter material of the first filter material layer is greater than that of the fine filter material of the second filter material layer. According to the invention, surrounding underground water is in contact with the coarse filter material in the first filter material layer and the fine filter material in the second filter material layer in sequence; therefore, the condition that soil particles are deposited in the precipitation drilling well is reduced, and the foundation pit precipitation effect is improved.

The application discloses an oral care toothpaste containing snake lily original medicinal material powder and a preparation method thereof, and belongs to the oral care preparation field. The core innovation is that the snake lily original medicinal material superfine powder prepared by a specific process is used as a core component, and a plurality of auxiliary materials are compounded to form a synergistic system, so that the effects of analgesia, anti-inflammation, caries prevention and anti-allergy are achieved; the snake lily original medicinal powder is treated through raw material screening, vinegar preparation detoxification, superfine crushing and multi-step coating embedding process, so that the toxicity and bitterness are effectively reduced, and the active component extraction efficiency is improved. The application solves the problems of the existing anti-inflammatory and analgesic toothpaste, such as large side effects and limited effects, and provides a new scheme for oral care.

The utility model is suitable for the technical field of dewatering equipment, and provides a vacuum dewatering and drainage device which comprises a pressing plate, a vertical pipe used for dewatering a soft soil foundation is arranged on the pressing plate, and water seepage holes are formed in the vertical pipe. The cover body is arranged on the vertical pipe, a shell is fixedly mounted on the cover body, a discharge pipe is fixedly mounted on the shell, a hose is fixedly mounted on the discharge pipe, and a water-gas dual-purpose pump is fixedly mounted at one end of the hose; and the pulling mechanism is assembled on the shell and is used for lifting the water-gas dual-purpose pump. According to the vacuum dewatering and drainage device, the technical problems that an existing dewatering well is low in dewatering efficiency, and the construction progress is affected are solved.

The invention provides an on-line purging-proton transfer reaction time-of-flight mass spectrometry system for detecting volatile organic compounds in water, which comprises an inert carrier gas source, an on-line purging automatic sampling device, a four-way joint and a proton transfer reaction time-of-flight mass spectrometer, the three-way valve is respectively connected with a first mass flow controller and a second mass flow controller; the gas inlet end of the on-line purging automatic sampling device is connected with the first mass flow controller; the four-way connector is respectively connected with the on-line purging automatic sampling device, the second mass flow controller, and the atmosphere and the proton transfer reaction time-of-flight mass spectrometer. According to the device, inert carrier gas is in full contact with a liquid sample through the on-line purging automatic sampling device, the precipitation efficiency of volatile or semi-volatile organic compounds is improved, complex pretreatment and chromatographic separation are not needed, the sample is directly subjected to soft ionization detection after being purged, the analysis time is remarkably shortened, and the operation and maintenance cost is greatly reduced.