43results about How to "Effective cohesion" patented technology

The invention provides an expansive soil direct shear test device and a shear strength measurement method. The device comprises a strain type direct shear instrument and a loading plate, wherein the loading plate is provided with a limiting structure and a pressure sensor; a larger overlying load is applied before a sample is soaked in water, the limiting structure controls the bottom surface of the loading plate to be contacted with the top surface of porous stone at the upper part of the sample, and the sample is not affected by the overlying load. The measurement method comprises steps as follows: static-pressure sample preparation is carried out according to geotechnical test rules of roads, the sample is soaked in water in constant volume, vertical expansive force is measured, a direct shear test is performed with the vertical expansive force as the overlying load, and effective cohesion and effective internal friction angle of experimental expansive soil are obtained. The test device and the method have the advantages of being simple, convenient to operate, reasonable in structure and economical and guarantee consistent micro-structure before sample shear under the action ofdifferent overlying loads in the direct shear test, so that the problem that shear strength parameters of expansive soil cannot be accurately obtained for a long time in the field is solved, and accurate design parameters are provided for civil engineering structure design of the expansive soil.

The invention discloses an air cleaner. The air cleaner is characterized by comprising a plasma module and a water filter module. The plasma module comprises a discharge electrode which generates plasma through high voltage discharge. The water filter module comprises a humidifying plate and a water tank, wherein part of the humidifying plate is immersed in water and rotates, then air is taken into the water, and the functions of humidifying and filtering are achieved. By means of the air cleaner, the plasma generated through electric discharge is combined with the water filtering so that the humidified air can carry rich negative oxygen ions; the plasma can achieve the effects of sterilization and disinfection, effectively remove volatile organic compounds and allow dust particulate matter to be charged and accumulated, so that the water filtering efficiency is greatly improved, and the water changing period is prolonged.

The invention provides a delta-valerolactone-based polymer. The structure of the delta-valerolactone-based polymer is subjected to infrared, nuclear magnetism and gel permeation chromatography characterization. The invention further discloses a preparation method and application of the delta-valerolactone-based polymer. The delta-valerolactone-based polymer is prepared through a Click reaction and a ring-opening polymerization, the reaction is simple and convenient, and the yield is high. The delta-valerolactone-based polymer is degradable under a certain condition, and acts with nucleic acid to form nano-particles easy to adsorb by cells; green fluorescent protein (GFP) and luciferase (Luciferase) expression experiments testify that the polymer can serve as a degradable non-viral gene vector and has high transfection efficiency; and the preparation method of the polymer and a preparation method of a transgenic vector are simple, mature and easy to learn.

The invention provides an adsorption/flocculation/photocatalysis composite dye wastewater treatment agent and a wastewater treatment method, and relates to the technical field of wastewater treatment.The adsorption/flocculation/photocatalysis composite dye wastewater treatment agent is prepared from the following raw materials (by weight): 0.1-0.5 part f cerium and gadolinium codoped nano-TiO2, 60-80 parts of PDMDAAC modified diatomite and 20-35 parts of an inorganic polymer flocculant. By combining adsorption, flocculation and photocatalysis and selecting appropriate raw materials, the prepared wastewater treatment agent has excellent treatment effect on dye wastewater, and has high decolorization rate, high COD removal rate and good degradation effect.

The invention discloses a tannic acid modified polyethyleneimine compound, a preparation method thereof and a gene vector, and relates to the technical field of biological medicine. The tannic acid modified polyethyleneimine compound has a structure shown as the following structural formula (I). According to the invention, tannic acid is used as a modification group to modify polyethyleneimine soas to obtain a tannic acid modified polyethyleneimine compound with a structure shown as the structural formula (I). The tannic acid modified polyethyleneimine compound can effectively coagulate DNA to form a nano-composite, can be used as a gene vector to transport DNA, and has the advantages of low toxicity, good biocompatibility and good water solubility due to the adoption of natural polyphenol tannic acid with good biocompatibility and low cytotoxicity as the modification group. Besides, the compound can be obtained through two-step reaction, the synthesis steps are few, the reaction operation is simple, and the synthesis cost is reduced.

The invention relates to a high-efficiency absorption hemostatic dressing and a preparation method thereof, and belongs to the technical field of medical consumables. The high-efficiency absorption hemostatic dressing of the invention includes a hemostatic layer, an absorption core layer, an antibacterial layer, a waterproof layer and a bottom layer in order. Preparation raw materials of the absorption core layer include fluff pulp and super absorbent resin. The absorption core layer of the invention adopts an absorption structure composed of the super absorbent resin and the fluff pulp, and so a large amount of blood can be quickly and fully absorbed and effectively coagulated without leaking back, thereby ensuring anti-seepage and anti-leakage. Meanwhile, the high-efficiency absorption hemostatic dressing has waterproof, breathable, antibacterial and hemostatic effects, promotes rapid healing of wounds, and is widely used in patients with moderate and severe bleeding.

The invention discloses a method for pretreating industrial waste water. The method comprises the following steps of: performing micro-electrolysis on an iron-carbon alloy, oxidizing the iron-carbon alloy by ozone, chemically precipitating calcium oxide and calcium chloride, stripping off ammonia and absorbing by acid. The BOD5/CODCr(B/C) of the industrial waste water treated by using the method is increased by over 45 percent, the chemical oxygen demand (COD) removal rate is more than 75 percent, the SO4<2-> removal rate is more than 90 percent, and the (NH3-N) removal rate is more than 93 percent.

The invention provides a low-carbon source high-ammonia nitrogen high-organic phosphor waste water combined type biological bed treatment technology. Five steps of raw water regulation, iron-carbon-internal Fenton treatment, struvite treatment, A2O treatment and Fenton deep processing are included, a first flocculating agent and a second flocculating agent are added to the iron-carbon-internal Fenton treatment and the Fenton deep treatment steps respectively. The low-carbon source high-ammonia nitrogen high-organic phosphor waste water combined type biological bed treatment technology is takenas the primary treatment manner of low-carbon source high-ammonia nitrogen high-phosphor waste water, the biochemical treatment efficiency is greatly improved, the problem of standard meeting emission of the low-carbon source high-ammonia nitrogen high-phosphor waste water is solved, and the technology has better social benefits and economical benefits; the Fenton effect is improved by the combination of internal Fenton, iron-carbon, micro electrolysis and Fenton, and the operation cost and operation working intensity are reduced.