585 results about "Cold area" patented technology

The invention discloses a hydrogen fuel cell vehicle ultralow temperature cold start thermal management system, and relates to the technical field of hydrogen fuel cell vehicle thermal management, the hydrogen fuel cell vehicle ultralow temperature cold start thermal management system comprises a thermal management platform, the thermal management platform is in communication connection with the following modules: a temperature monitoring and predicting module, and the temperature prediction module is used for monitoring the temperature of key parts in the hydrogen fuel cell by using the temperature sensor and predicting the change trend of the temperature in the fuel cell in combination with the temperature prediction model. By utilizing the high-precision temperature sensor and the long-short-term memory network model, the internal temperature change trend of the fuel cell is pre-judged in advance, the heating power is dynamically adjusted, it is ensured that the temperature of the cell is rapidly increased to the proper working temperature in the ultralow-temperature environment, starting difficulty caused by local supercooling is avoided, the low-temperature starting time is remarkably shortened, and the starting efficiency is improved. The reliability and the stability of the system in an extreme environment are improved, and the normal operation of the hydrogen fuel cell vehicle in a cold region is guaranteed.

The invention discloses an analogue simulation system for operation of a ground source heat pump and a gas boiler in a severe cold area. The analogue simulation system comprises a heat supply correction model building module, a ground source / gas heat supply estimation module, a heat supply dispatching distribution module and a correction model optimization module. According to historical operation data of a ground source heat pump subsystem, heat supply correction models associated with soil geology and environmental climate are constructed based on a single variable principle, a heat supply amount estimated value of the ground source heat pump subsystem is dynamically corrected, heat supply amount of a gas boiler subsystem and heat load required by a building group are estimated, heat supply output of the two subsystems is intelligently distributed, and heat supply efficiency is improved. And the heat supply amount correction model is optimized through the actual heat supply amount deviation. The method can effectively overcome the problem of ground source heat pump heat supply amount deviation caused by soil heat unbalance and climate fluctuation in a severe cold area, further improves the energy efficiency estimation precision of a heat supply system, facilitates optimization of a scheduling strategy, has dynamic compensation and model self-evolution capabilities, and can adapt to complex environmental changes.

The invention relates to the technical field of snow melting disaster early warning, in particular to a snow surface rain disaster identification method based on a high and cold mountainous area and a related product, and the method comprises the steps: constructing a snow surface rain disaster single-point identification rule capable of being physically explained by using meteorological observation data and remote sensing inversion data of a small amount of weather stations in the high and cold mountainous area; the method is advantaged in that classification is carried out without depending on a black box model, precision and interpretability of single-point snow surface rain event discrimination are improved, regional popularization is carried out through dynamic downscaling simulation of a regional climate mode WRF coupling land surface process model Noah-MP, a point-surface fusion snow surface rain disaster discrimination and identification system is constructed, and the method is advantaged in that the method is simple and convenient to operate. The method is suitable for identifying snow rain disasters in complex terrain areas with high and cold areas, high altitude, large gradient, lack of data, even no data and the like, and solves the technical problems of insufficient snow rain disaster space identification capability and low precision caused by sparse observation data in the high and cold mountainous areas in the prior art.

The invention relates to the field of data storage, in particular to a storage and calculation separation multi-dimensional data block indexing method based on adaptive learning. Comprising the steps of receiving original multi-dimensional data and a query load, and outputting a low-dimensional key set through a first model; the low-dimensional key set and the historical query load generate a partitioning scheme through a second model, and the partitioning scheme performs physical recombination on the original multi-dimensional data to output a plurality of physical data blocks; constructing a learning type index through the physical data blocks and the corresponding partitioning schemes; identifying hot spot and cold spot areas through the query frequency of each node of the learning type index and the real-time query load continuous monitoring index; when the access mode changes, adjusting the index structure, and outputting a self-adaptive index; and quickly positioning and reading the target data block through the self-adaptive index to complete access. According to the method, the index of adaptive learning is provided, and the index structure and the physical data layout are adjusted, so that the query accuracy and efficiency in a complex scene are improved, and the data storage overhead is reduced.

The invention discloses an alpine meadow aboveground biomass monitoring method based on PROSAIL-BP, and belongs to the field of ecological remote sensing information processing. In order to overcome the defect that samples in the alpine region are insufficient and have high precision and high reliability, the method comprises the steps that an alpine meadow mask, remote sensing images and field biomass data in a target region are obtained, the remote sensing images are spliced, the wave band reflectivity is normalized, and the grassland region reflectivity is reserved in combination with mask cutting; predefining a PROSAIL model matched with the region features; performing Sobol global sensitivity analysis to obtain a first-order sensitivity index and a total-order sensitivity index of the parameter; screening a key wave band and four high-sensitivity parameters; uniformly sampling to generate a parameter group, simulating a hyperspectrum through PROSAIL, extracting the reflectivity of a key wave band, and constructing a data set by multiplying a leaf area index by a dry matter content as a target variable; and training a three-layer BP neural network, and processing the reflectivity output pixel biomass of the remote sensing key wave band. The method is applied to a remote sensing information processing system and has high precision and high reliability.

The invention relates to the technical field of concrete, and particularly discloses high-strength low-heat-conductivity self-compacting concrete and a preparation method thereof. The high-strength low-heat-conductivity self-compacting concrete can maintain ideal strength performance while improving the heat insulation performance, so that the high-strength low-heat-conductivity self-compacting concrete is more suitable for being applied to occasions sensitive to temperature, such as underground spaces and external walls in severe cold areas. In addition, the ceramsite provided by the invention also provides a new consumption way for the vanadium slag, and can effectively realize recycling of wastes.

The invention discloses a vapor chamber and a manufacturing method thereof. The vapor chamber comprises an upper cover, a lower cover and a metal foil, the lower cover is connected with the upper cover, a containing cavity is formed between the lower cover and the upper cover, and a cooling medium is contained in the containing cavity; the metal foil is arranged in the containing cavity, a condensation cavity is formed between the metal foil and the upper cover, an evaporation cavity is formed between the metal foil and the lower cover, and a plurality of capillary holes are distributed in the metal foil and communicated with the condensation cavity and the evaporation cavity. According to the vapor chamber, the metal foil is arranged between the upper cover and the lower cover, backflow of a liquefied cold area medium in the condensation cavity into the evaporation cavity is achieved through the capillary holes formed in the metal foil, and the overall thickness of the whole vapor chamber can be set to be smaller due to the arrangement of the metal foil.

The invention relates to the technical field of stamping dies, in particular to a cooling system of a stamping die and the stamping die, the cooling system comprises a cooling liquid tank, and further comprises a water pump mounted in the cooling liquid tank; the fixed pipe is fixedly communicated with the side wall of the cooling liquid tank; the first connecting pipe is fixedly communicated between the water pump and the fixed pipe; the telescopic spraying assembly is installed in the fixing pipe and used for spraying cooling liquid on the surfaces of a lower die and an upper die of the stamping die body when the stamping die body conducts stamping part transposition; the telescopic spraying assembly further comprises an airflow driving assembly, and when the telescopic spraying assembly is started, the airflow driving assembly is started synchronously. According to the device, through the arrangement of the telescopic spraying assembly, an atomized cold area is driven to diffuse to the periphery, the flowing and evaporation effect of atomized cooling liquid can be accelerated, the cooling effect of the cooling liquid on a mold is improved, and the cooling efficiency is improved.

The invention belongs to the technical field of corrugated pipes, and discloses a low-temperature-resistant PVC corrugated pipe and a preparation method and application thereof.The low-temperature-resistant PVC corrugated pipe is prepared from, by weight, 90-100 parts of PVC, 20-30 parts of HPVC, 15-25 parts of HNBR, 10-15 parts of functional additive, 8-12 parts of cold-resistant agent, 2-3 parts of antioxidant, 2-4 parts of stabilizer and 1-2 parts of lubricant; wherein the functional additive is obtained by grafting diethyl allyl phosphate and glycidyl methacrylate on an ethylene-vinyl acetate copolymer. In a specific PVC / HPVC / HNBR / functional additive system, through the synergistic effect of interface compatibility optimization, low-temperature resistance complementation and mechanical property balance, the PVC corrugated pipe still has excellent performance in a low-temperature environment, and application and popularization in cold regions or seasonal low-temperature time regions are facilitated.

The invention provides a phase change-moisture absorption and drainage composite roadbed structure in a seasonal frozen region and an intelligent regulation and control method, and relates to the technical field of roadbed design and renovation. The roadbed structure is characterized in that a plurality of gradient phase change material layers are arranged on the top surface of a roadbed surface layer; the multi-layer gradient phase change material layer, the high moisture absorption and drainage geotextile layer and the drainage pipe system are arranged from top to bottom; the phase change temperature intervals and the phase change latent heat of the phase change layers in the multiple gradient phase change material layers are different; the high moisture absorption and drainage geotextile layer is used for guiding water in the soil body into the drainage pipe system; the drainage pipe system is of a porous structure with the inclination angle within the set angle range and is used for guiding water in the soil into the drainage ditch. And the intelligent regulation and control system is used for dynamically regulating the thermal resistance of each phase change layer and the opening degree of the drainage pipe. According to the invention, the time of the roadbed in a relatively stable physical state can be prolonged, so that the purpose of preventing and treating winter frost heaving, frost boiling and mud rising in a spring melting period and other diseases caused by temperature change of the roadbed in severe cold areas is achieved.

A system and method for controlling motorized vents of an HVAC system of a vehicle including at least one motor to move air louvers of an HVAC vent of the HVAC system, at least one thermal sensor to sense hot / cold areas inside the vehicle, and a position and motion control to control movement of the at least one motor, wherein position and motion control determines a targeted positioning of airflow based on hot / cold areas sensed by the thermal sensor.

The invention relates to the technical field of circulating water anti-freezing, and discloses a power plant circulating water anti-freezing system suitable for a cold region, and the system comprises a temperature sensing module, an anti-freezing heating module, a water flow disturbance module, an ice layer processing module, an intelligent regulation and control center and a fault safety module; when the circulating water system of the power plant operates in a cold region, the internal water temperature and external environment parameters of key nodes of a circulating water pipe network are monitored in real time, and a low-temperature early warning signal is generated based on a temperature field reconstruction algorithm of machine learning, so that abnormal temperature fluctuation can be recognized in time, early warning delay and false alarm caused by wind speed and humidity interference are avoided, and the working efficiency is improved. And in the circulating water anti-freezing process, the output power of the flexible electric heating body is dynamically adjusted through a graded heating mechanism, and the turbulence generator is linked to optimize water flow distribution, adapt to thermal inertia change of a pipeline and prevent the risk of local icing caused by sudden temperature drop.

The invention discloses a method for preserving heat of a urea NaOH and Mg (OH) 2 storage cabin, and aims at a ship which is provided with an SCR (Selective Catalytic Reduction) system, an EGR (Exhaust Gas Recirculation) system, an iCER (Initial Continuous Emission Reduction) system and a desulfurization system and needs to store urea, NaOH or Mg (OH) 2. Condensed water of the air conditioning unit is collected and then introduced into the storage cabin in a gravity mode, and the condensed water generation amount and the condensed water temperature of the air conditioning unit are analyzed and calculated. On the premise that the cabin capacity meets the condition, condensate water is used for cooling the urea cabin and then discharged into the clean cabin bottom water cabin, and the cooling capacity of the condensate water is utilized to the maximum extent. In winter or in a cold area, when the air conditioning unit does not need to operate, in order to avoid too low temperature of the solution cabin, the storage cabin can be heated by using the discharged water in the clean cabin bottom water cabin before discharging, so that the storage temperature of the urea, NaOH or Mg (OH) 2 solution is ensured to be 10-35 DEG C.

The invention discloses an anti-freezing device for a winter hydrological monitoring system in a severe cold area, and the anti-freezing device comprises water disturbance equipment which is provided with a water outlet located in water in a hydrological monitoring cylinder. And the water disturbance equipment continuously conveys water to water in the hydrological monitoring cylinder through the water outlet so as to disturb the water in the hydrological monitoring cylinder. According to the device, disturbance equipment, such as a submersible pump or a centrifugal pump, is integrated in a hydrological monitoring cylinder through an integrated frame; the disturbance equipment goes deep into a certain water level and then continuously disturbs a water body so as to achieve the anti-icing effect.

The invention discloses a hydrolysis-resistant low-temperature-resistant bi-component nano acrylate grouting plugging material and a preparation method thereof. The plugging material is prepared by mixing a component A and a component B according to a volume ratio of 1: 1, the component A is prepared from the following components in parts by mass: 25 to 40 parts of acrylate, 12 to 20 parts of hydrolysis-resistant modified component, 3 to 8 parts of low-temperature-resistant functional component, 8 to 15 parts of nano modified filler, 0.3 to 0.8 part of cross-linking agent, 1.5 to 3.0 parts of accelerant, 0.3 to 0.6 part of pH regulator and 40 to 50 parts of deionized water; the component B is prepared from the following components in parts by mass: 1.5 to 2.5 parts of a composite initiator, 0.2 to 0.5 part of a low-temperature catalyst, 0.8 to 1.5 parts of a dispersion stabilizer, 0.3 to 0.8 part of a hydrolysis-resistant auxiliary agent and 90 to 100 parts of deionized water; the plugging material meets the following performance indexes: the 28d compressive strength is greater than or equal to 6.5 MPa, the strength retention rate is greater than or equal to 85% when the plugging material is soaked in distilled water at 50 DEG C for 30 days, the strength loss is less than or equal to 10% when the plugging material is frozen and thawed for 30 times at-30 DEG C, the 28d bonding strength with a concrete base material is greater than or equal to 2.5 MPa, the 0.1 mm micro-crack penetration depth at 25 DEG C is greater than or equal to 60 mm, and the setting time at 25 DEG C is 30 seconds to The method can effectively meet the requirement for leakage water treatment in the high-humidity and high-water-pressure environment of underground engineering in the cold region.

The invention relates to the technical field of building materials, and discloses a self-repairing microcapsule-based composite waterproof material and a preparation method thereof, and the self-repairing microcapsule-based composite waterproof material comprises the following components by weight: 60-80 parts of modified organic silicon resin, 5-15 parts of nano clay (modified montmorillonite), 3-8 parts of a self-repairing microcapsule, 2-5 parts of a water-based cross-linking agent, and 0.5-2 parts of a dispersing aid. Stress generated by settlement and temperature change of a building structure can be effectively resisted, and cracks are reduced fundamentally; meanwhile, the material still keeps flexibility at the low temperature of-30 DEG C (without cracks when bent), and the technical bottleneck that a traditional material is prone to embrittlement in a cold region is broken through; more importantly, the 24-hour self-repairing rate is up to 92%, self-healing of cracks can be achieved without manual intervention, the service life of waterproof engineering is prolonged to more than two times that of a traditional material, the full-life-cycle maintenance cost is remarkably reduced, and a long-acting and reliable solution is provided for the field of building waterproofing.

The invention provides a thermoelectric coupling-based multi-target energy-saving scheduling method for a thermal power generating unit in an alpine region. The method comprises the steps of obtaining historical unit operation data, historical heat supply network operation data and historical meteorological data; constructing a training sample based on the historical unit operation data, the historical heat supply network operation data and the historical meteorological data, and performing offline training by adopting a regression algorithm to obtain a thermoelectric coupling scheduling model; the thermoelectric coupling scheduling model is used for mapping the input feature into a target scheduling control quantity; in the operation process, unit operation data, heat supply network operation data and external weather prediction data which are collected in real time are input into the thermoelectric coupling scheduling model, and prediction scheduling control quantity is generated; and generating a scheduling execution instruction based on the predicted scheduling control quantity, and issuing the scheduling execution instruction to a unit control system for execution. According to the method, combined optimization of the power generation process and the heat supply process can be achieved, the method can well adapt to weather changes in the alpine region, energy consumption can be reduced, and the stability of unit operation can be improved.

The utility model discloses a double-heating type diesel oil filter assembly which comprises a base located at the top, a middle shell and a lower shell are sequentially connected to the base downwards, a cylindrical filter element is arranged in the middle shell, an annular oil inlet cavity is defined by the circumferential surface of the filter element and the middle shell, a base inner cavity communicated with the oil inlet cavity is formed in the base, and the lower shell is arranged in the base. A bottom cavity is formed in the lower shell and is communicated with the oil outlet cavity through a hydrophobic net; an upper heater is arranged in an inner cavity of the base, a lower heater is arranged in a bottom cavity of the base, the upper heater is connected with an upper connector, and the lower heater is connected with a lower connector; the upper heater is connected with a vehicle-mounted circuit through an upper connector, and the lower heater is connected with the vehicle-mounted circuit through a lower connector. The diesel oil heater is simple in structure, diesel oil is heated at the upper end and the lower end at the same time through the upper heater in the inner cavity of the base and the lower heater in the bottom cavity, the oil temperature can be effectively increased, the heating requirement of a diesel oil filter in a high cold area is met, and it is guaranteed that the diesel oil has low viscosity and good fluidity; and the fuel supply requirement of the diesel engine is met.

The invention discloses a thermal insulation photovoltaic-thermoelectric coupling system for severe cold areas, which comprises a photovoltaic cell, a phase change container, a phase change material and a thermoelectric power generation sheet, and is characterized in that the phase change container filled with the phase change material and the thermoelectric power generation sheet are sequentially arranged below the photovoltaic cell; the bottom of the photovoltaic cell is connected with the upper side of the phase change container through heat-conducting glue, the lower side of the phase change container is connected with the thermoelectric power generation sheet through heat-conducting glue, phase change materials in the phase change container utilize and transfer heat generated by the photovoltaic cell in the whole process, the effect of keeping and slightly increasing the temperature of the photovoltaic panel is achieved, and meanwhile large heat flow input is provided for the hot end of the thermoelectric sheet. Effective utilization of solar energy is ensured through the two effects, and the conversion efficiency of the coupling system is improved. In addition, the cold ends of the thermoelectric pieces make contact with the external environment, waste heat is dissipated into the cold environment through convection and radiation heat dissipation, and thermoelectric conversion is maintained.

The invention belongs to the technical field of ground source heat operation management, and particularly discloses an intelligent operation management system for geothermal energy in a severe cold area. The system comprises an acquired data verification module, a soil dynamic analysis module, a thermal imbalance risk prediction module and a control priority determination module. According to the method, geothermal operation data are collected and verified in real time, key indexes such as heating power, soil accumulated heat taking capacity and heat recovery rate are calculated, meteorological prediction data are combined to drive a soil heat transfer model to conduct prospective simulation, and a heat imbalance risk index is output. And the control priority of the heat supply quality and the soil heat imbalance is dynamically determined and output based on the risk index and the change trend thereof, so that the heat recovery capability of the soil is effectively maintained while the heat supply requirement is met, and meanwhile, the priority management direction between the heat supply quality guarantee and the soil heat imbalance prevention and control is defined; and therefore, effective balance is realized between maintaining the heating demand of the user and protecting the sustainability of terrestrial heat.

A shotcrete interface reinforcement mortar for use in cold-region tunnel water seepage conditions, and its preparation method and application, belong to the field of shotcrete technology. Its raw materials are as follows: cement, water, calcium salt, phase-change temperature control component, modified silane coupling agent, fine aggregate, liquid alkali-free quick-setting agent and water reducer, wherein the phase-change temperature control component is a mixture of emulsion polymer powder and adhesive, and the modified silane coupling agent is a nanomaterial-modified silane coupling agent. The present invention is specifically aimed at how to effectively improve the bonding strength and water penetration resistance of shotcrete in low-temperature environments when cold-region tunnels are facing low-temperature water seepage construction environments. This new idea not only focuses on solving key problems such as the decrease in concrete bonding strength and susceptibility to freeze-thaw damage, which are common in tunnel construction in cold regions, but also aims to fundamentally improve the bonding condition between concrete and construction surface through refined surface treatment technology, and enhance its ability to resist structural damage caused by low temperature and water penetration.

The invention belongs to the technical field of building materials, and particularly relates to composite concrete containing nano silicon dioxide modified rubber powder and a preparation method, the composite concrete comprises the following raw material components by weight: 400-500 parts of 52.5 grade cement, 60-80 parts of fly ash, 600-700 parts of slag, 30-40 parts of silicon powder, 900-1000 parts of pebbles with a particle size of 5-25 mm, 200-300 parts of water, and 0.5-1.0 part of a water reducer. 2 to 20 parts of nano silicon dioxide modified rubber powder and 0.08 to 0.12 part of basalt fiber. The compatibility and interfacial strength between the rubber powder and a concrete matrix are greatly improved, the problem that existing rubber concrete is insufficient in freeze-thaw resistance is solved, meanwhile, the microstructure and compactness of the composite concrete are improved through the unique nano effect, and therefore the freeze-thaw cycle resistance of the composite concrete is remarkably improved, and the service life of the composite concrete is prolonged. The application scene of the rubber concrete is obviously widened, and the rubber concrete has more advantages especially in cold regions or constructional engineering needing to bear extreme weather conditions.

Various illustrative systems, devices, and methods for face masks are provided. In general, a face mask is configured to provide cooling therapy to a user wearing the face mask. In an exemplary implementation, the face mask includes a thermoelectric cooling device, such as a Peltier device, a thermoelectric cooler (TEC), or other thermoelectric cooling device. The thermoelectric cooling device is configured to generate heat through a thermoelectric effect where a heat flux is created at a junction of two different types of materials. The heat flux creates a cold area and a hot area. The cold area is configured to face toward the user's face to provide cool energy to the user's skin.

The utility model provides an energy storage battery thermal management system based on a shallow underground cold source in a high-altitude severe cold region, the system comprises a battery box, a liquid cooling pipeline, an air pipeline and a control system, the battery box is internally provided with a battery module, a PTC heating film, a liquid cooling plate and a phase change material; the liquid cooling pipeline takes shallow underground soil in the severe cold area as a cold source for heat dissipation through the underground liquid cooling tank; the air pipeline can introduce low-density and low-heat-conductivity-coefficient air in a high-altitude area into the interlayer of the battery box to form large thermal resistance, so that the heat insulation and heat preservation functions of the battery box are realized. According to the system, heat is provided for low-temperature preheating of the battery module through the PTC heating film and the electric heater in the liquid cooling pipeline, heat insulation and heat preservation are achieved through the air interlayer of the battery box, and rapid heating is achieved; coolant in the liquid cooling pipeline exchanges heat through the shallow underground cold source and absorbs heat of the battery module in the interlayer of the battery box and the liquid cooling plate, so that effective heat dissipation is realized.

A method for improving the temperature uniformity of microwave heating is characterized by adding auxiliary materials containing temperature-sensitive electromagnetic materials simultaneously inside, outside, or both inside and outside the material. This causes the heating capacity of the material as a whole or a specific local area within a desired temperature range to decrease as the temperature increases, thereby making the temperatures of hot and cold areas within this temperature range more similar. This invention can significantly improve the temperature uniformity of microwave heating, eliminates the need for complex temperature monitoring methods, and has a wide range of applications.

The utility model discloses an integrated heat dissipation decoration ring structure which comprises an inner lampshade and an outer lampshade which are arranged inside and outside, an LED module is arranged on the back side of the inner lampshade, and a heat dissipation decoration ring is further arranged between the outer lampshade and the inner lampshade. The radiating decorative ring comprises a radiating fin body arranged on the back of the LED module, a plurality of radiator connecting ribs connected with the radiating fin body and located on the side of the inner lampshade, a connecting plate connected with the radiator connecting ribs and located on the front side of the inner lampshade, and a plurality of radiating fins arranged on the connecting plate and bent towards the outer lampshade. The heat dissipation structure can be combined with the decoration ring in a limited space, the number of parts is reduced, meanwhile, the heat dissipation performance can be guaranteed, and the problem of mist generated by a local cold area of the outer lampshade can be solved.

The utility model provides a prestressed reinforced concrete pier reinforcing device, which relates to the technical field of bridge engineering and comprises a pier body, a first limiting block arranged on one side of a first hoop, a first bolt arranged on one side of the first limiting block, a fourth limiting block arranged on one side of the first hoop and a third limiting block arranged on one side of a second hoop. The protection pads are arranged at the two corners of the interior of the first hoop and the two corners of the interior of the second hoop respectively, the five water leakage holes are formed in the protection pads, in this way, rainwater cannot form accumulated water at the tops of the first hoop and the second hoop during use, the corrosion effect of the accumulated water on the pier is reduced, and in a cold region, the bridge pier is protected from being damaged. The damage of frost heaving caused by accumulated water freezing to the bridge pier can be reduced without accumulated water, so that rainwater can be drained in time to prevent the hoop from bearing the weight of the accumulated water for a long time, the reinforcing effect of the hoop on the bridge pier is guaranteed, the hoop can play a role more stably, and the service life of the bridge pier is greatly prolonged.

The invention discloses a roller compacted concrete construction method in a cold region, which comprises the following steps: heating coarse and fine aggregates in a closed preheating bin until the internal temperature is 5-10 DEG C, mixing by adopting a double-horizontal-shaft forced mixer, controlling the water temperature to be 25-35 DEG C, and adding a retarding water reducing agent; the mixed concrete is loaded into a dumper with an interlayer thermal insulation layer (filled with a polyurethane foaming material), and the transportation time is controlled within 40 minutes; after warehousing, paving in layers (each layer is 30-40cm) and rolling, pre-burying temperature sensors (arranged according to a 10m * 10m grid), and covering three layers of thermal insulation materials (a bottom layer polyethylene film, a middle flame-retardant polystyrene thermal insulation board and a surface layer waterproof canvas); when the temperature is lower than 5 DEG C, starting the fuel hot air unit to supply hot air through the galvanized steel pipe; warm water of 5-10 DEG C is automatically sprayed during curing, the curing time is corrected according to the temperature, and a curing agent is brushed after mold removal. The method is suitable for roller compacted concrete construction in cold regions, and the freezing injury risk and the crack occurrence rate can be comprehensively reduced.

Various illustrative systems, devices, and methods for face masks are provided. In general, a face mask is configured to provide cooling therapy to a user wearing the face mask. In an exemplary implementation, the face mask includes a thermoelectric cooling device, such as a Peltier device, a thermoelectric cooler (TEC), or other thermoelectric cooling device. The thermoelectric cooling device is configured to generate heat through a thermoelectric effect where a heat flux is created at a junction of two different types of materials. The heat flux creates a cold area and a hot area. The cold area is configured to face toward the user's face to provide cool energy to the user's skin.

The utility model provides a tunnel heating air supply device suitable for a cold region, which comprises a fan, the fan is connected with air duct cloth in a tunnel through an air duct, the air duct is formed by rolling an iron sheet or an aluminum sheet, a heating assembly is arranged in the air duct, and the heating assembly comprises a heating element, a temperature sensor and a controller. The temperature sensor and the heating element are electrically connected with the controller, a maintenance window corresponding to the temperature sensor is formed in the side wall of the air duct, and heat preservation and insulation layers are arranged outside the air duct and the maintenance window; the draught fan brings hot air into the tunnel, the temperature in the tunnel is guaranteed, and the problems that air fluidity becomes poor in the low-temperature environment, cold air accumulation, humidity increase and damage to the tunnel structure are caused, and the construction efficiency of constructors in the low-temperature environment is reduced are avoided. Therefore, it is guaranteed that the temperature in the tunnel is appropriate, and the situation that the tunnel air duct cloth is affected by too high temperature or workers are affected by too low temperature is avoided.