149results about How to "Low temperature" patented technology

The invention relates to a high-precision and constant temperature and humidity cabinet, which is used for storing special articles. The temperature and humidity in the cabinet can be controlled within designated scope automatically and constantly. In the invention, a cooling/heating semiconductor high-temperature stacking is used as a temperature control and dehumidification executive component, an ultrasonic wave humidifier is used as a humidification executive component, and an electric temperature/humidity sensor, a series of fans, keys, a display, a controller and the like are mounted, thereby realizing constant temperature and humidity. When temperature inside the cabinet is higher than preset target temperature, the temperature control semiconductor high-temperature stacking generates forward current to reduce the temperature inside the cabinet; when temperature inside the cabinet is lower than the preset target temperature, the temperature control semiconductor high-temperature stacking generates reverse current to raise the temperature inside the cabinet to the preset target temperature; when humidity inside the cabinet is higher than preset target humidity, the dehumidification semiconductor high-temperature stacking generates forward current to reduce the temperature of a condensation block in the cabinet to be below the dew point, so as to enable moisture in the cabinet to condensate and flow into a water tank to realize dehumidification effect; and when humidity inside the cabinet is lower than preset target humidity, an ultrasonic wave humidifier sprays water mist to raise the humidity in the cabinet to the preset target humidity.

A gas sensor element designed to measure the concentration of gas such O₂ is provided. The gas sensor element is formed by a laminate of an oxygen ion conductive solid electrolyte layer made of zironia, a reference gas-exposed electrode, and a measurement gas-exposed electrode. The measurement gas-exposed electrode is made of a laminate of an outer electrode layer and an intermediate electrode layer. The outer electrode layer is made of metal or a mixture of the metal and zirconia. The metal is Pt, Ag, Rh, or Pd. The intermediate electrode layer is made of a mixture of zirconia and Pt, Ag, Rh, or Pd and greater in content of zirconia than the outer electrode layer. This structure results in increased reaction interfaces where the gas reacts with platinum particles and zirconia particles in the measurement gas-exposed electrode and the solid electrolyte layer, thereby ensuring higher catalytic activity and electrical conductivity.

A comprehensive localized therapy method and equipment for tumor features that various endoscopes are used to inject the magnetic immune microspheres carrying biologic medicine and the antineoplastic magnetic chemical medicine into tumor focus, the liquid radioactive source is poured in the inner cavity of catheter, and an alternative magnetic field is generated around the tumor focus to induce the microspheres to generate heat and adsorbing the antineoplastic medicine to round the tumor focus. Its advantage is the combination of biotherapy, chemicotherapy, radiotherapy and thermotherapy.

The invention discloses a rapid construction method of an arched pipe truss. The rapid construction method comprises the following steps that (1) a BIM structural model of the arched pipe truss is established; (2) horizontal integrated pre-assembly and segment welding are performed in a factory for the pipe truss to form truss bodies to be transport to a site; (3) the truss bodies are assembled to form two main trusses; (4) in-span brackets are installed; (5) the two main trusses are lifted and welded to connect the two main trusses into the pipe truss; (6) the assembled pipe truss is lifted in place to complete installation of the pipe truss; (7) the steps 2-6 are repeated to form two pipe trusses, a secondary truss and a roof support are installed, so that the installed part forms a whole force system; and (8) the steps 2-7 are repeated until all pipe trusses are installed. According to the rapid construction method of the arched pipe truss, in-span vertical one-time splicing rapid construction of the arched pipe truss can be completed in the case of poor on-site site conditions, the risks of working at height are reduced, the construction period is ensured, the construction cost is saved, and multiple purposes are achieved at one stroke.

The invention discloses a dephosphorization flocculating agent and a preparation method thereof. The dephosphorization flocculating agent is formed by compounding an inorganic flocculating agent and an organic flocculating agent. The raw materials of the inorganic flocculating agent comprise sodium ferrate, borax, ferrous sulfate, silicate or aluminate; the raw materials of the organic flocculating agent comprise modified chitosan or modified polyacrylamide. The preparation process comprises the following steps: firstly adding a non-oxidizing acid into the silicate or aluminate to obtain a polysilicate colloid or an aluminum hydroxide colloid, then adding a borax solution and a sodium ferrate solution sequentially while stirring, further dropping a ferrous sulfate solution, mixing to form the inorganic flocculating agent, standing, then adding the modified polyacrylamide or modified chitosan into the inorganic flocculating agent, curing and adding the acid till the pH value is less than 7 to obtain the finished dephosphorization flocculating agent. The flocculating agent is suitable for a wide range of water quality, is little affected by co-existing salts, the pH value of sewage and temperature and is particularly effective for dye wastewater, oilfield sewage and the like.

The invention relates to an acidic and transparent silicone weather-resistant sealant for construction, and belongs to the technical field of adhesives. The acidic and transparent silicone weather-resistant sealant is prepared from the following components in parts by weight: 50-150 parts of hydroxyl terminated polydimethylsiloxane, 20-140 parts of methyl terminated polydimethylsiloxane, 10-60 parts of fumed silica, 5-40 parts of a cross-linking agent, 0.05-0.5 part of a catalyst and 0.05-5 parts of a composite anti-yellowing agent. The acidic and transparent silicone weather-resistant sealant has the advantages of high strength, good adhesive performance, excellent weather resistance, quick crosslinking curing at room temperature and the like, and can be widely applied to weather-resistant sealing of glass curtain walls, glass daylighting roofs and other constructional engineering.

The invention relates to a preparation technology of efficient polymeric aluminum chloride for wastewater treatment. The preparation technology is mainly technologically characterized by comprising the following steps: with hydrochloric acid, aluminum hydroxide and a polymerization regulator as main raw materials, producing a liquid solution by a high-temperature, low-pressure and alkaline adjustment two step method; and producing powdery solid by a centrifuging or pressure spray drying and curing environment-friendly technology. The preparation technology disclosed by the invention is advanced in process, high in production efficiency, fast in purification speed, good in treatment effect, wide in application field, low in treatment cost, energy-saving and environment-friendly, and has important application and popularization values by adjusting the raw material ratio in production.

The invention discloses a chitosan/polyvinyl alcohol/ferroferric oxide composite magnetic particle as well as preparation and application thereof, and relates to a composite magnetic particle, which is formed by the following components in percentage by mass: 20-80% of chitosan, 10-75% of polyvinyl alcohol and the balance of ferroferric oxide. The particle diameter is 500-4000 micrometers and is controllable. The preparation method comprises the following steps: mixing a chitosan acid solution with a polyvinyl alcohol water solution; adding ferroferric oxide powder; dispersing ferroferric oxide powder in the mixed liquid to obtain a mixed liquid; adding a NaOH solution into the mixed solution; curing to ball-shaped particles; collecting the obtained ball-shaped particles through an outside magnetic field and adding the particles into ethanol; swelling and standing; soaking and washing, and drying to obtain the chitosan/polyvinyl alcohol/ferroferric oxide composite magnetic particle. As shown in experiment, the chitosan/polyvinyl alcohol/ferroferric oxide composite magnetic particle can be used in preparation of agents for removing heavy metal in water.

The invention relates to a servo acceleration meter based on differential infrared displacement sensing. The differential infrared displacement sensing servo acceleration meter is characterized in that: a shell is made of a soft magnetic material; a cylindrical detection quality block is sleeved outside a cylindrical permanent magnet; the cylindrical detection quality block is fixed on the shell by a spring; a plurality of magnetic driving coils are wound outside the cylindrical detection quality block; two ends of each magnetic driving coil are connected with a feedback current input port which is formed on the shell; a light blocking sheet is fixed on the cylindrical detection quality block; a light transmission hole is formed on the light blocking sheet; two sheet-like infrared receiving tubes are arranged on a supporting plate in parallel from up to down; the supporting plate is fixed on the shell; infrared transmitting tubes are arranged on the shell; the light transmission hole on the light blocking sheet is positioned between the infrared transmitting tubes and the infrared receiving tubes; and output terminals of the infrared receiving tubes are connected with an infrared displacement sensing signal output port through signal lines. The servo acceleration meter based on the differential infrared displacement sensing is characterized by simple structure, good low-frequency property, high measurement accuracy and high sensitivity.

The invention discloses a cylindrical air medium high-temperature thermostatic bath which comprises a shell, an insulating layer, an inner tank, an insulation cover plate, a temperature sensor, a heater, a motor and a temperature controller; the key points of the thermostatic bath lie in that: the internally lower part of the shell is provided with the motor and the temperature sensor; the upper middle part of the shell is provided with the inner tank; an output shaft of the motor runs through the insulating layer and the bottom of the inner tank, and is fixedly connected with a centrifugal fan blade at the bottom of the inner tank; the middle of the inner tank is fixedly provided with a porous uniform-temperature cylinder; a cylindrical air deflector and the heater are arranged between the inner tank and the porous uniform-temperature cylinder; the working medium of the inner tank is an air medium; the temperature sensor is arranged between the porous uniform-temperature cylinder and the cylindrical air deflector; the insulation cover plate covers an upper opening of the inner tank and is provided with small through holes used for inserting a standard thermometer and a thermometer to be detected. The bath successfully realizes the high-temperature thermostatic bath taking the air medium as the working medium and has the advantages of safety, environmental protection, multiple purposes, being economical and wide working temperature range.

The present invention discloses a constant-temperature groove, which comprises a groove body (1) and is characterized in that the groove body (1) is divided into 2 cavities (2) including a left one and a right one, wherein circulation channels (3) are arranged on the upper end and the lower end between the cavities (2), a stirring oar (4) is arranged inside one of the cavities (2) and connected with an electrical machine (5). The groove body provided by the present invention is divided into 2 cavities, one of which is adopted as the working area, and the other is provided with the stirring oar inside to form a single circulation of the medium, thereby having simple structure, higher technical standard, and the temperature which is much more stable and even. As proved by the test carried out by National institute of metrology, the technical index of the present invention is superior to or meet the national standard, meanwhile the present invention adopts the stirring on the lateral of the working area, thereby preventing the stirring oar of the constant-temperature groove from being damaged by the fallen thermometer used to measure the temperature. The present invention has the advantages of a simple structure, small fluctuation of both the temperature and the maximum temperature difference, and the technical index superior to the national standard, etc.

The invention provides a method for growing thallium bromide monocrystal by spontaneous nucleation, comprising the following steps of: 1) filling a thallium bromide material into a cylindrical ampoule with diameter of 8 to 15mm, vacuumizing, sealing, and processing one end of the ampoule into a cone with the cone angle between 15 and 45 degrees; 2) placing the ampoule into a vertical tube furnace with the conical end towards the bottom of the furnace, heating the vertical tube furnace to enable the temperature of the thallium bromide material in the conical tip not to be lower than the melting point of thallium bromide, raising the temperature from the conical tip upward to the inside of a top area of the thallium bromide material with the temperature gradient between 1.0 and 1.5 DEG C/mm, and then, insulating; 3) reducing the temperature of the tube furnace to between 450 and 460 DEG C at the speed between 1 and 5 DEG C/h; and 4) cooling the ampoule to room temperature along with the furnace. Because a heater and the ampoule are not required to be moved, the invention saves the complicated mechanical transmission device, simplifies the technology and reduces cost. The ampoule and the heater are both fixed, the temperature field is stable, heat inside the crystal and molten mass is uniformly distributed, a convex growth interface can be easily acquired, and the thallium bromide with good integrity and considerable size can be grown.