134 results about "Specific heat" patented technology

The invention relates to the field of thermal flow guide path optimization, and discloses an electronic communication equipment heat dissipation method based on thermal flow guide path optimization, which comprises the following steps: arranging a plurality of thermal paths between a chip and a radiator, combining the thermal paths into a network structure in parallel and series modes, and constructing a selectable thermal flow path network structure; collecting real-time temperature and load data of each module, and constructing a multi-dimensional thermal state database in combination with historical operation records and environmental parameters; thermal resistance and module temperature of each thermal path are analyzed, priority is set according to module types and power loads, key modules correspond to specific thermal flow paths, non-key modules distribute thermal flow through remaining paths, and a thermal flow planning scheme is generated; the thermal resistance of each path is adjusted through the phase change material, and a target thermal resistance value is generated; in the chip operation process, the temperature, load and thermal resistance state of each thermal path are continuously collected, and a thermal resistance adjusting instruction is generated; the method has the advantage that the thermal management efficiency and the temperature control precision are improved.

A cold storage material according to an embodiment contains a rare earth aluminum oxide containing at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, in which a Group 1 element is contained in an amount of 0.001 atom % or more and 10 atom % or less, and a maximum volumetric specific heat value in a temperature range of 2 K or more and 10 K or less is 0.5 J / (cm3·K) or more.

The invention relates to an anti-overtemperature control method and system for an aluminum alloy sheet heating furnace, and the method comprises the following steps: arranging a plurality of thermocouples in the length direction and the width direction in the heating furnace, forming a temperature matrix, and collecting the temperature distribution data of a working area in the furnace in real time; a transient heat conduction prediction model of the aluminum alloy sheet is established, and the model is combined with physical property parameters of aluminum alloy and comprises the relation that the specific heat capacity, the heat conductivity coefficient, the density and the emissivity change along with the temperature; based on the temperature matrix and the transient heat conduction prediction model, predicting a temperature rise curve of the thin plate in a future set time; and when the predicted temperature exceeds the preset safety threshold value, the heating power or the start-stop state of the corresponding heating area is adjusted in advance, and active anti-overtemperature control is achieved.

The invention provides a nondestructive testing method and system for a coarse grain layer on the surface of an aluminum alloy forge piece, and relates to the technical field of nondestructive testing. First surface temperature field time sequence data corresponding to a standard workpiece are collected, and according to the environment temperature, the workpiece heat conductivity, the workpiece specific heat capacity and detection environment parameters, the first surface temperature field time sequence data are obtained; generating a thermal response difference threshold calibration curve corresponding to the standard workpiece; performing eddy current induction heating on the to-be-detected workpiece at the same heating time as the standard workpiece and the preset workpiece interval, and collecting second surface temperature field time sequence data corresponding to the to-be-detected workpiece; comparing the temperature of each moment in the second surface temperature field time sequence data with the temperature of the moment corresponding to the thermal response difference threshold value calibration curve, and if the temperature difference value between the second surface temperature field time sequence data and the thermal response difference threshold value calibration curve exceeds a preset temperature threshold value, determining that the thermal response difference threshold value calibration curve does not exceed the preset temperature threshold value; and if so, determining that the coarse grain layer exists on the surface of the to-be-detected workpiece or the depth of the coarse grain layer on the surface of the to-be-detected workpiece exceeds the limit. According to the invention, the nondestructive detection precision of the metal workpiece can be improved.

The invention discloses a temperature field estimation method for a liquid cooling-phase change hybrid cooling structure of a permanent magnet motor. The method comprises the steps that a motor cooling structure is divided into independent areas, and a three-dimensional heat conduction model is constructed under overload working condition operation; setting temperature nodes in the independent areas of the stator and the phase change material along the circumferential direction, taking the other independent areas as the temperature nodes, and taking motor loss as a heat source, so as to construct a thermal network topological structure; a convective heat transfer coefficient is obtained, the heat capacity of cooling oil in the circumferential direction and the equivalent specific heat capacity of a phase change material are applied to temperature nodes, motor loss is applied to a heat source, and an equivalent transient heat network model is constructed; and obtaining the temperature rise of each temperature node until the overload condition is finished, and obtaining an estimated temperature field. The phase-change material effectively inhibits the instantaneous large temperature rise of the permanent magnet under the overload working condition; the model can completely represent the circumferential temperature gradient distribution, reflect the temperature space distribution difference of the stator winding under the overload condition, and improve the estimation speed of the temperature field.

The invention discloses a deep mine filling body heat storage performance prediction method and system based on PINN and Transformer, and the method comprises the steps: arranging a multi-point temperature sensor in a deep mine filling body heat storage system, and combining key control factors to predict the heat storage performance of a deep mine filling body; obtaining sequence data of temperature of multiple points in the filling body along with time and sequence data of temperature of a pipeline outlet along with time, so as to establish a first training sample and a second training sample; respectively training the thermal physical property parameter inversion model based on the physical information neural network and the optimized Transform neural network prediction model, obtaining the predicted thermal conductivity coefficient and specific heat capacity of the filling body through the trained thermal physical property parameter inversion model based on the physical information neural network, and predicting the thermal conductivity coefficient and specific heat capacity of the filling body by adopting the trained optimized Transform neural network prediction model to obtain the thermal conductivity coefficient and specific heat capacity of the filling body. And obtaining the predicted outlet temperature of the heat exchange tube of the deep mine so as to predict the heat storage performance of the filling body of the deep mine.

The embodiment of the invention provides a nuclear reactor melt physical property parameter determination method and device, and relates to the technical field of nuclear reactors. The method comprises the following steps: receiving a physical property parameter acquisition request, wherein the physical property parameter acquisition request comprises the type of a target substance in a nuclear reactor melt; in response to the physical property parameter acquisition request, acquiring a base class pointer corresponding to the target substance according to the type of the target substance; based on the base class pointer, a physical property calculation relation related to the target substance is called, and the physical property calculation relation comprises a mapping relation or a function calculation relation; according to the physical property calculation relation, physical property parameters of the target substance are determined, and the physical property parameters comprise at least one of density, specific heat capacity, emissivity and heat conductivity. According to the embodiment of the invention, the reliability of physical property parameters can be improved.

The invention discloses a gas specific heat ratio measuring device and a gas specific heat ratio measuring method, particularly relates to the technical field of gas specific heat ratio measurement, and solves the technical problems of low measuring precision, inconvenience in operation, poor safety and narrow application range of a traditional gas specific heat ratio measuring experimental device in the prior art. According to the technical scheme, an air pressure sensor measures changes of air pressure and temperature in a bottle, and data can be displayed in real time by being connected with a computer; by optimizing sensor design and a signal processing algorithm, the measuring device can respond to air temperature and pressure changes more quickly; the stepping motor is used for controlling opening and closing of the piston, and errors caused by human factors are reduced; the change of the air specific heat ratio at different temperatures can be explored by changing the temperature; according to the invention, intelligent and automatic measurement is realized, errors caused by manual operation are reduced, and data change visualization in the whole experiment process is provided, so that students can intuitively analyze the change of each physical quantity.

The invention discloses an ORC working medium optimization method and framework based on Jacob number and critical temperature, and relates to the technical field of energy engineering, and the method comprises the following steps: A1, inputting heat source parameters, cold source parameters and a candidate working medium database; a2, calculating thermophysical parameters such as critical temperature, critical pressure and specific heat of each working medium and Jacob number under a design working condition; and A3, defining a dynamic working condition spectrum, analyzing the matching characteristics of the working medium critical temperature and the heat source at different heat source temperatures, simulating the evolution law of the system power and efficiency when the evaporation temperature changes, and tracking the Jacob number and time system performance in real time when the evaporation temperature of different working media changes by constructing the dynamic working condition spectrum. Therefore, a universal working medium optimization criterion is constructed from the perspective of thermodynamics, the problems that the ORC working medium optimization criterion is not uniform and the correlation mechanism of the working medium physical property and thermal performance is not clear are solved, and efficient optimization of the ORC working medium is achieved.

The invention discloses a mechanical friction spark temperature testing method based on multiple thermocouples and particle size analysis, which comprises the following steps of: 1, preparing a test piece, processing the surface of a friction test piece, and fixing an embedded thermocouple array in the test piece; secondly, dynamic pressure loading is conducted, and friction pressure is adjusted through a high-pressure air bottle and a piston type air cylinder; 3, synchronously monitoring multiple thermocouples, and arranging the thermocouples to synchronously acquire data; step 4, spark particle size capturing: a high-speed camera and a laser particle size analyzer are adopted to acquire particle size distribution and speed track of spark particles in real time; 5, temperature-particle size correlation correction is carried out, and a temperature attenuation model is established based on the specific heat capacity and the heat conductivity coefficient of spark particles; and step 6, data fusion output: fusing and outputting analysis results. A plurality of thermocouple arrays are arranged at the center and the edge of a friction interface and on a spark splashing path, and temperature data in the friction heat and spark cooling process are synchronously collected.

In a computer-implemented method for ascertaining a temperature curve of a layer, which is a cross-section of an object, for selective solidification of the layer by a laser or electron beam for a powder-based additive manufacturing process, exposure vectors are provided for the layer. A model of the layer is provided, wherein the model represents the layer and a portion of the object lying below the layer as the cross-section of the object, and takes into account a portion of the object lying below the layer as a location-dependent specific heat capacity and a location-dependent thermal resistance. The temperature curve is ascertained by thermally simulating a scan of the layer with the exposure vectors using the model.

This invention discloses an evaporation boat with thermal compensation function, comprising a main body, an insulation layer, a phase change layer, and thermocouples. The main body is a split type, with the insulation layer surrounding it, and the phase change layer surrounding the insulation layer. The phase change layer is also split and correspondingly positioned to the main body, with thermocouples positioned outside the phase change layer. This patent aims to solve the problem of uneven temperature distribution in the evaporation boat caused by structural issues and varying heat dissipation at different locations along its length. By setting phase change layer segments with different specific heat capacities, and utilizing the differences in material properties of these segments, the temperature rise differs when different phase change layer segments absorb the same amount of heat, resulting in different temperature differences between them and the corresponding main body. This alters the heat dissipation rate of the corresponding main body, achieving a uniform temperature distribution of the material inside the main body.

A water-cooled heat dissipation and monitoring system includes a pump, water-cooled piping, a water-cooling block, a water-cooling radiator, multiple temperature sensors, and a microcontroller. The pump and water-cooled piping are used to transfer the coolant. The water-cooling block is in thermal contact with a power element. The water-cooling radiator is used to facilitate heat exchange between the coolant and the surrounding environment. Multiple temperature sensors are located at at least two different points along the water-cooling path. The microcontroller is connected to the multiple temperature sensors and the pump, and is used to obtain at least one temperature difference at at least two different points and a measured flow rate of the coolant. Based on the at least one temperature difference, the measured flow rate, the specific heat capacity and density of the coolant, the microcontroller obtains an estimated power consumption and an estimated temperature of the power element, and controls the pump's rotation speed to adjust the coolant flow rate based on the estimated temperature.

The invention relates to the technical field of nuclear reactor control, and discloses a self-adaptive predictive control method and system for a main pump of an integrated pressurized water reactor, and the method comprises the following steps: S101, arranging a flow sensor, a temperature sensor, a pressure stabilizer liquid level sensor, a neutron flux sensor and the like in the integrated pressurized water reactor; s201, acquiring measurement values of the sensor in the step S101, such as primary loop coolant flow, reactor core inlet and outlet temperature, main pump inlet and outlet flow, voltage stabilizer liquid level value, reactor power and the like; s301, establishing a self-adaptive predictive control model of the reactor coolant main pump; and S401, the measured value in the S201 is substituted into the mathematical model in the S301, and the precise control quantity of the rotating speed of the main pump is obtained. A CNN-BILSTM-Attention prediction model is developed and is used for predicting physical quantities which are difficult to measure or cannot be measured in actual operation, such as a heat transfer coefficient, specific heat capacity, fuel temperature and the like. Through the control strategy of'prediction + advanced intervention ', the prediction model enhances the stability and safety of the system, and improves the safety margin of the system.

The invention discloses a concrete specific heat capacity measuring device and method based on a gradient temperature control circulation method. The system adopts an innovative double-layer heat insulation structure water tank design. The test method comprises three stages: firstly, carrying out an empty box heating test to determine the background heat capacity of the system; then a pre-balanced standard curing test block is put in for a main heating stage; and finally, accurately measuring the heat capacity of the test block through a dynamic balance stage. According to the method, the double-layer heat insulation design and the dynamic equilibrium criterion are creatively combined, the real effective specific heat capacity of the MPCM concrete can be obtained in a complete test block state, the effective specific heat capacity of the MPCM concrete can be directly and accurately quantified on the premise that the real engineering structure form (standard curing test block) of the MPCM concrete is kept, the test precision is improved compared with that of a traditional method, and the method is suitable for popularization and application. The single test time is short, a reliable and efficient test means is provided for thermal performance research and engineering application of the phase change concrete, and the method has universality for testing the specific heat capacity of the concrete material.

The invention relates to the technical field of thin-strip continuous casting, in particular to a method for measuring interface thermal resistance in the molten steel solidification process, which comprises the following steps: calculating temperature distribution in the molten steel cooling process by using a mathematical modeling method, and accurately calculating the change condition of the interface thermal resistance in the molten steel solidification process by combining experimental data of a molten drop solidification device. The method specifically comprises the following steps: controlling the dripping temperature of molten steel, obtaining temperature measurement data of two thermocouples according to a thermal simulation experiment, obtaining the height and room temperature of a steel drop, and obtaining a heat flow of a steel sample and a copper substrate interface and the surface temperature of a copper mold based on the temperature measurement data of the two thermocouples; establishing a one-dimensional heat transfer model, and calculating the overall temperature distribution of the molten steel by combining the density, specific heat capacity and other parameters of the steel sample; the interface thermal resistance of the molten steel in the copper mold surface heat transfer process is calculated by adopting the following formula based on the overall temperature distribution of the molten steel, so that the interface thermal resistance can serve as a thermal resistance parameter of a heat transfer interface to be applied to a numerical simulation calculation process, and production is guided.

In the method according to the application, the substance to be tested (FL) is allowed to flow through the pipeline in the specified flow direction, and the wall temperature value X Tw is ascertained, which represents the wall temperature T w of the wall of the lumen of the pipe, which encloses the pipeline. Furthermore, the density value X p of the density p of the substance to be tested flowing in the pipeline, the viscosity value X μ of the viscosity μ of the substance to be tested flowing in the pipeline, the thermal conductivity value X λ of the temperature conductivity λ of the substance to be tested, the heat capacity value X p of the specific heat capacity c cp of the substance to be tested, and the pressure difference value X Δρ of the pressure difference Δρ generated in the substance to be tested flowing in the pipeline in the flow direction are ascertained and then used to ascertain the characteristic number value X V of the characteristic number V of the substance to be tested, which characterizes the heating of the substance to be tested flowing in the pipeline as a result of dissipation, wherein the characteristic number V of the substance to be tested corresponds to the calculation formula: V = f(Δp, p, μ, λ, c p ) = Pr a · ec b · ζ c , which is determined by the Eckert number Ec of the substance to be tested flowing in the pipeline, the Prandtl number Pr of the substance to be tested flowing in the pipeline and the pressure loss coefficient ζ of the pipeline, and by the pipeline-specific first exponent a, the pipeline-specific second exponent b and the pipeline-specific third exponent c. Finally, the temperature value X V representing the temperature T Tw of the substance to be tested is ascertained using the characteristic number value X M and the wall temperature value X TM . For this purpose, the measuring system according to the application additionally comprises a temperature sensor, which is thermally coupled to the lateral surface of the wall for generating a temperature measurement signal, which corresponds to a change in the temperature T w of the wall as a function of a change in at least one signal parameter, and a measuring and operating electronics system, which is electrically connected to the temperature sensor.

This invention discloses an apparatus and method for measuring the specific heat of solid test samples. The apparatus includes a container, a data acquisition and processing system, a storage compartment, and a heater. Based on the 3ω method, this invention constructs an apparatus for measuring the specific heat of solid test samples, which solves the technical problems of measurement interference from conductive materials in molten samples, the impact of oxidation on accuracy during measurement, and damage to the measuring wire during the addition and melting of molten samples. Specifically, separating the storage compartment and the container, and then using a protective gas to transport and inject the solid test sample into the first chamber after melting in the storage compartment, reduces disturbance to the measuring wire and ensures that the experiment is conducted under a protective gas atmosphere, thereby improving the success rate of the experiment.

The utility model belongs to the technical field of flat cables, and particularly relates to a flat colored flat cable, which comprises a perspective shell, colored leads arranged at equal intervals are clamped on the inner wall of the perspective shell, two flow guide pipe frames are arranged in the perspective shell, and the side surfaces, close to each other, of the two flow guide pipe frames are in contact with the outer surfaces of the colored leads. The front face and the back face of the perspective shell are each provided with a three-way pipe, the ends, close to each other, of the two three-way pipes penetrate through the perspective shell and fixedly communicate with the outer surfaces of the two flow guide pipe frames, and the right end of each three-way pipe fixedly communicates with a telescopic hose. Heat generated by the colored wires can be absorbed through contact between the flow guide pipe frame and the colored wires, and meanwhile, the heat can be transferred from the colored wires to the flow guide pipe frame through heat conduction by utilizing the fact that water has high specific heat capacity and can absorb a large amount of heat, the temperature rise of the water is relatively small, and therefore the temperature of the colored wires is reduced.

The present application belongs to the technical field of natural gas hydrate exploitation, and discloses a device and method for real-time nondestructive calculation of equivalent specific heat in hydrate decomposition process. The device comprises a visual flat reaction kettle, a nondestructive high-precision phase state identification system, a gas and liquid inlet and exhaust system, and a computer acquisition system. The principle of the present application is that: through the method of providing uniform heat source by heat conduction outside the reaction kettle, hydrate decomposition is promoted, and internal heat convection can be ignored. Real-time volume fraction of each component is obtained by the nondestructive high-precision phase state identification system, Newton interpolation calculation is used for the volume fraction, latent heat of phase transition of hydrate deposit at adjacent temperature is calculated, and equivalent specific heat of hydrate deposit is obtained. The present application realizes real-time nondestructive calculation of equivalent specific heat field in hydrate decomposition process. The method is environmentally friendly and economical, and the device is clear and visual, which provides technical support for the research on latent heat of phase transition and equivalent specific heat in the process of hydrate exploitation.

The invention discloses a Fe-B-P-C-Cu-Co series amorphous-nanocrystalline transition state structure alloy with an excellent magnetic-electric synergistic effect and a preparation method of the Fe-B-P-C-Cu-Co series amorphous-nanocrystalline transition state structure alloy, and belongs to the field of metal material processing and manufacturing, the chemical components of the alloy comprise, by atomic percent, Fe B Pc < d > Cu < e > Co < f >, a is equal to 80-85, b is equal to 10-15, c is equal to 1-5, d is equal to 0.5-2, e is equal to 0.2-1, f is equal to 0-5, and the balance is inevitable impurities; the mother alloy is prepared by melting raw materials through vacuum induction, and an amorphous alloy thin strip is prepared by adopting a single-roller rapid quenching method; after the amorphous alloy is treated by a specific heat treatment process, the saturation magnetization of the amorphous alloy is 1.81 T, the coercive force is 3.8 A / m, and the resistivity is 117.2 [mu] omega.cm. The method has important theoretical and practical significance for developing amorphous-nanocrystalline transition-state structure alloy with an excellent magnetic-electric synergistic effect.

The invention relates to the technical field of building thermal engineering, solves the problems of inaccurate and incomplete evaluation of the heat storage performance of a building envelope and poor environmental adaptability in the prior art, and provides a method, a device and equipment for evaluating the heat storage efficiency of the building envelope and a storage medium to prepare a target test piece containing a functional material; carrying out a cross-characteristic change temperature interval experiment by utilizing the dynamic thermal and humid climate wind tunnel to obtain nonlinear thermal response data; constructing an enthalpy method discrete numerical model, and performing parameter inversion by taking the minimum root-mean-square error of theoretical surface heat flow and actually measured heat flow as a target to obtain thermophysical parameters and an effective specific heat capacity curve; and constructing a thermal network model based on the inversion parameters, and simulating hourly heat flow of each node of the test piece, so as to calculate a multi-dimensional heat storage efficiency evaluation index of the enclosure structure. According to the method, the high-precision wind tunnel experiment, the nonlinear heat transfer model and the inversion algorithm are coupled, the dynamic heat storage performance of the enclosure structure is accurately quantified, and an accurate and practical solution is provided for evaluating the heat storage efficiency of the functional enclosure structure.

The embodiment of the present application provides a road disease identification method, when road ponding is scanned, a scanning image and an infrared thermal image of the road ponding are acquired; the scanning image and the infrared thermal image are subjected to image generation processing through a trained image generation model, and a target image without road ponding is obtained; and road diseases under the road ponding are identified based on the target image. The target image without road ponding is generated through the scanning image and the infrared thermal image of the road ponding, the target image is used to identify road diseases corresponding to the road ponding, because the specific heat capacity of the ponding and the road is different, the heat dissipation modes of the road and the ponding are also different, the infrared thermal images of different roads and different ponding are different, the infrared thermal image can implicitly have the difference between the road and the ponding in terms of heat, therefore, the implicit information of the infrared thermal image and the texture of the scanning image can be used to generate the image without ponding, and the accuracy of road disease identification is further improved.

The invention discloses a heat conductivity coefficient measuring device and a measuring method, the heat conductivity coefficient measuring device comprises a sample heating copper disc a, a sample heating copper disc b, a height-adjustable clamp and a reading and measuring device, the sample heating copper disc a and the sample heating copper disc b are connected through the height-adjustable clamp and are arranged at two sides of the clamp, and the height can be adjusted through a knob; and the reading and measuring device can respectively or simultaneously measure the temperatures of the upper and lower experiment discs in the sample heating copper disc a and the sample heating copper disc b, and is provided with a timing device. The heat conductivity coefficients of two samples can be measured at the same time, the heat conductivity coefficient of the other sample can be measured through one given heat conductivity coefficient, the mass, the diameter, the specific heat capacity and the like of a copper disc do not need to be measured, asbestos gloves do not need to be worn in the operation process, and experiment loss is effectively reduced.

This invention relates to a method and system for simultaneously measuring thermal conductivity, specific heat capacity, and interfacial thermal resistance, belonging to the field of thermophysical property measurement technology. First, a TDTR (Transient Thermal Resonance) measurement is performed on the sample under test using a preset laser spot size and modulation frequency that meet preset criteria, obtaining a measurement signal. Then, the initial parameter values ​​of the sample are input into a heat transfer model to obtain a simulated signal. The initial parameter values ​​are continuously adjusted until the deviation between the simulated signal and the measured signal is less than a preset value. At this point, the initial parameter values ​​are used as the measured parameter values ​​of the sample. Both the measured signal and the simulated signal include a negative delay time period of -20 to -5 ps and a positive delay time period of 0.1 to 4 ns. A single TDTR measurement can simultaneously determine the thermal conductivity, specific heat capacity, and interfacial thermal resistance of the sample, greatly expanding the measurement capabilities of TDTR technology.

The invention provides a rapid prediction method for high-temperature yield strength of an orthotropic metal material. The method comprises the following steps: establishing an expression of material distortion energy density based on an equivalent energy method; deducing a specific expression of distortion energy density based on a stress-strain component by considering a uniaxial tensile stress state and orthoanisotropy of the material; calculating to obtain a key constant value under a uniaxial tensile stress state and a material melting temperature; and finally, deriving a high-temperature yield strength expression of the material in different directions. According to the method, a small number of parameters such as the elastic constant and the specific heat capacity which can be quickly obtained through table look-up are used as input, the yield strength values of the orthotropic material at different temperatures can be quickly predicted, and high cost caused by high-temperature tests of a large number of materials can be avoided; and a fast and efficient yield strength prediction mode is provided for material high-temperature performance prediction and structure high-temperature strength check in practical engineering.

This invention provides a method, device, electronic device, and storage medium for continuous casting and rolling temperature monitoring. The method includes determining the current values ​​of multiple first monitoring parameters and multiple second monitoring parameters based on the current temperature distribution and multiple preset mapping relationships. Each first monitoring parameter includes a two-phase composition ratio, and each second monitoring parameter includes a weighted specific heat capacity determined based on the two-phase composition ratio. The two-phase composition ratio is determined based on the current temperature distribution, the length of the temperature range for the austenite-ferrite phase transformation, and the average temperature of the temperature range. Based on the current temperature distribution, the current value of the weighted enthalpy, the current values ​​of each second monitoring parameter, and a preset finite difference heat conduction equation, the estimated enthalpy for the next moment is determined. The current value of the two-phase composition ratio is used as the estimated ratio value for the next moment, and the estimated temperature value for the next moment is determined based on the estimated enthalpy for the next moment. This invention introduces the thermodynamic effects of the austenite-ferrite phase transformation to improve the accuracy of temperature monitoring.

The invention belongs to the technical field of testing of physical properties of rock and soil, and particularly relates to a device and a method for testing thermal physical properties of expansive rock and soil, which ensure that a rock and soil sample is in a required humid and hot condition by accurately adjusting the temperature and humidity of an experimental environment. The expansion change of the rock and soil sample is synchronously recorded by acquiring displacement data. And all monitoring data are transmitted to a computer in real time for processing and storage. And the computer analyzes the thermophysical properties (such as heat conductivity coefficient, specific heat capacity, thermal diffusivity and the like) of the rock-soil sample in real time according to the collected data, and finally outputs an accurate test result. The whole working process ensures accurate measurement and efficient test of the thermal physical properties of the expansive rock and soil in a complex humid and hot environment.

The present application relates to the technical field of cold storage. Specifically disclosed are a cold storage material, and a preparation method therefor and the use thereof. The cold storage material comprises a Gd2O2Se crystal. The cold storage material in the present application comprises the Gd2O2Se crystal, and the Gd2O2Se crystal has a phase transformation near 6.22 K, a relatively large specific heat in a temperature range of 1-10 K, and an obvious magnetothermal effect and can be used as a cold storage material at a liquid helium temperature.

A method for determining the adiabatic temperature rise of high fly ash concrete, which can accurately reflect the temperature change of high fly ash concrete, take into account the early age and later period, and more flexibly and accurately simulate the actual hydration heat process of high fly ash concrete. It comprises: (1) obtaining the thermal conductivity, temperature conductivity, bulk density, specific heat, linear expansion coefficient and Poisson's ratio of high fly ash concrete through experiments, and obtaining the initial adiabatic temperature rise parameters of high fly ash concrete through adiabatic temperature rise test; (2) determining the first part of the model first, using the measured data of the dam body and combining with simulation calculation to obtain the first part of the model; (3) using the thermometer pre-buried in the structure to measure the temperature rise value of the concrete after reaching the minimum temperature in the actual project, and according to the relationship between the data and the age, the second half of the model is analyzed by regression analysis to obtain the adiabatic temperature rise parameters of the second half of the model formula; (4) obtaining the complete formula, and calculating the concrete temperature field according to the formula.