68 results about "Thermal instability" patented technology

The invention relates to the technical field of computer-aided monitoring and simulation, in particular to a thermal imaging monitoring system based on digital twinning, which comprises a sensing and edge calculation module used for acquiring a temperature matrix from a thermal imaging sensor and calculating the temperature matrix to obtain a regional-level thermal instability index; the data processing module is also used for judging a risk level corresponding to the regional-level thermal instability index, and generating a thermal anomaly feature vector when the risk level is greater than a preset normal level; and the twinborn platform quick response module is used for receiving the thermal anomaly feature vector, positioning virtual assets in the digital twinborn scene according to the thermal anomaly feature vector, and then executing a hierarchical response decision on the virtual assets according to a risk level in the thermal anomaly feature vector. And the method is converted into an autonomous safety guarantee capability with perspectiveness and instantaneity.

The invention relates to the technical field of optical fiber communication and optical measurement, in particular to an all-glass single-mode polarization-maintaining optical fiber collimator and a preparation method thereof.The all-glass single-mode polarization-maintaining optical fiber collimator comprises a collimating lens, a glass sleeve, a quartz ferrule and a single-mode polarization-maintaining optical fiber which are sequentially arranged along an optical path; the collimating lens and the glass sleeve are bonded and fixed through an oxyhydrogen catalytic bonding solution; an optical fiber core of the single-mode polarization maintaining optical fiber extends into the quartz ferrule, and one end of the quartz ferrule extends into the glass sleeve and is bonded and fixed with the glass sleeve through an oxyhydrogen catalytic bonding solution; the optical fiber collimator is prepared into a full-glass structure, stable collimation performance is ensured, meanwhile, the hydrogen-oxygen catalytic bonding technology is adopted for bonding and fixing all parts of the optical fiber collimator, high-strength and glue-free bonding can be achieved, the problem of thermal instability caused by poor thermal conductivity is effectively avoided, and long-term stable optical performance is ensured.

The invention relates to the technical field of laser line width adjustment, and discloses an excimer laser and a line width narrowing module thereof, and the line width narrowing module comprises a housing, an accommodating cavity is formed in the housing, and the housing is provided with a light through hole for light to enter the accommodating cavity; the prism is arranged in the accommodating cavity and right faces the light through hole; the optical grating is also arranged in the accommodating cavity, and the light through hole, the prism and the optical grating are sequentially arranged in the incident direction of the light; and the blowing mechanism comprises a plurality of gas flow uniformizing devices arranged on one side of the prism and one side of the grating, and the gas flow uniformizing devices conduct blowing towards the prism and the grating. Water molecules and other factors causing optical component degradation can be effectively isolated, and the service life of the optical component is prolonged; and a large amount of heat is taken away through convection heat dissipation, so that the heat dissipation of the light-passing surface is better, the phenomenon of thermal instability is more difficult to occur, and the stability of excimer laser wavelength screening is more easily ensured.

The invention discloses a triplex nested logic-based park energy storage and load cooperative scheduling method, system and device and a medium, and belongs to the technical field of intelligent power grid and energy storage operation control, and the method comprises the steps: obtaining park operation data, and generating first scheduling prediction information; generating an executable power candidate scheme based on the prediction information and the real-time operation data; action frequency constraint processing is executed, and an action recovery mechanism is established and verified; cooling window control is implemented, and the execution time, the power change amplitude and the power change sequence of actions are limited; and then comprehensive judgment is carried out, a final scheduling instruction is generated, and scheduling parameters are adaptively corrected according to execution feedback. Through triple nested logic, the number of times of start and stop, direction switching and power climbing can be limited in real time under the conditions of high-proportion new energy access and rapid load fluctuation, a cooling window is actively planned, the action sequence is optimized, and thermal instability and voltage impact caused by frequent charging and discharging or continuous high-power operation are avoided.

The invention belongs to the field of space electric propulsion, and particularly relates to a working medium-free cathode heating method, which comprises the following steps: heating a working medium-free cathode by adopting a constant voltage mode and a constant power mode, dividing the heating process into a plurality of stages, calculating the heating voltage according to the expected power of each stage, and heating for a period of time under corresponding heating; after multi-stage constant-voltage heating is completed, a constant-power heating mode is switched to, the working-medium-free cathode heating voltage is adjusted, and the adjusted working-medium-free cathode heating power is made to be equal to the set rated heating power; according to the method, the thermal instability of working medium-free cathode heating can be effectively reduced, and the working performance of the cathode is enhanced; in the constant-power heating mode, as the input heating power is always a constant value, the temperature of the working-medium-free cathode tends to be stable due to the zeroth law of thermodynamics, namely the thermal equilibrium law, as time goes on, and then thermal instability and noise caused by the thermal performance of the working-medium-free cathode are reduced.

The invention discloses a growth method for reducing a Pit defect on a silicon carbide epitaxial surface, which comprises the following steps of: after epitaxial growth is completed, increasing the air flotation flow of a base, increasing the temperature in a reaction chamber, reducing the pressure in the reaction chamber and increasing the hydrogen flow, and entering an etching stage; hydrogen chloride gas is introduced discontinuously in the etching stage, and at least one introduction time period and an interruption time period after the introduction time period are included; the thermal instability of SiC at high temperature / low pressure is utilized, efficient decomposition is achieved through an H2 / HCl synergistic etching system, sub-damage and dislocation are reduced while the etching rate is increased, the thickness of the removed epitaxial layer can be accurately controlled, the Pit defect of the surface layer of the epitaxial layer is reduced, the crystallization quality of the epitaxial layer is kept, and the subsequent power device preparation requirement is met.

The invention relates to the field of automobile safety, and discloses a trailer axle intelligent temperature monitoring and intelligent fire extinguishing system which is characterized in that a temperature sensor is used for collecting axle operation temperature data in real time, whether local temperature rise rate abnormity is detected or not is judged, and a data analysis module is entered; performing multi-parameter fusion analysis on the temperature state flow, and calculating a temperature change gradient by adopting a sliding window algorithm; based on axle temperature distribution characteristics and historical working condition data, evaluating a thermal instability risk level, dynamically adjusting an alarm threshold value and a response strategy, judging whether the risk level reaches an early warning standard or not, and if yes, starting sound-light alarm and cockpit prompt; communication connection with the main control terminal is established through a vehicle-mounted bus, whether an emergency fire extinguishing instruction is received or not is judged, and if yes, the instruction is synchronously transmitted to the fire extinguishing execution module; the spraying area and the spraying intensity are automatically selected according to an emergency fire extinguishing instruction issued by the communication management module. The method has the advantage that the operation safety of the trailer is improved.

The invention relates to an atmospheric pressure photo ionization rapid desolventizing device and method, and the device comprises a sampling valve which is installed on a sampling pipe of a high-pressure reactor and can be opened and closed according to a preset frequency; the atomizing unit is mounted on the sampling pipe at the downstream of the sampling valve and is used for atomizing a sample solvent; an inlet of the laval spray pipe is connected with an outlet of the sampling pipe, and an outlet of the laval spray pipe is led to a normal-pressure photo ionization area, so that a solvent is subjected to flash evaporation removal, and a product flows to the photo ionization area to realize ionization; wherein the Laval nozzle is provided with a temperature control system which is used for controlling the temperature of the Laval nozzle. According to the method, the solvent can be quickly removed, the integrity of thermal instability components is ensured, and the analysis accuracy is improved.

The present invention provides an electrolyte and a preparation method and application thereof. The electrolyte includes a lithium salt, an organic solvent and an additive, wherein the additive includes a fluorine-containing compound and fluoroethylene carbonate as shown in Formula 1, wherein 0≤n≤6, and R1, R2 and R3 are independently hydrogen atoms or fluorine atoms. The present invention partially replaces fluoroethylene carbonate with a fluorine-containing compound, reduces the amount of fluoroethylene carbonate, can mitigate the negative impact caused by the thermal instability of fluoroethylene carbonate, and improves the high temperature stability of the battery while ensuring the cycle performance.

The present invention provides a fusidic acid cream preparation, comprising an active ingredient fusidic acid, an aqueous phase part and an oil phase part, wherein the aqueous phase part comprises glycerol, a preservative and purified water; the oil phase part comprises an oily base and an emulsifier; further, in order to avoid the increase of impurities caused by the addition of antioxidants to the excipients due to their thermal instability, the cream does not contain antioxidants. After testing, the stability of the fusidic acid cream of the present application is better than that of the commercially available reference preparation, and it can maintain the stability of the paste properties and active ingredients under high temperature, high humidity, low temperature, freeze-thaw and light conditions. The maximum single impurity and total impurity content in the product do not increase significantly, and the quality is controllable. At the same time, the preparation process of the fusidic acid cream disclosed in the present application is simple and easy to industrialize.

This invention discloses a dynamic temperature rise diagnosis and alarm method for high-voltage switchgear, comprising: collecting operating status data of thermal response structural nodes and constructing a multi-measurement point time-series data sequence; constructing a node association structure based on the multi-measurement point time-series data sequence to form a thermal potential constraint inversion map; constructing an improved SOFTS model that integrates thermal potential constraint weights and outputting baseline prediction and collaborative embedding vectors; stripping normal temperature rise components based on the difference between baseline prediction and actual measurement, and extracting abnormal temperature rise components to determine the number of fault embryos; constructing local candidate regions to extract thermal evolution coupling features, generating local thermal instability judgment indicators, and identifying abnormal temperature rise self-activation threshold kernels; generating dynamic temperature rise diagnosis results and outputting corresponding alarm information based on the execution mechanism and evolution judgment of abnormal temperature rise self-activation threshold kernels. This invention achieves early and accurate diagnosis and forward alarm of abnormal temperature rise in high-voltage switchgear through thermal potential constraint modeling and improved SOFTS fusion analysis.

The utility model discloses a heating device for an axial non-uniform thermal destructive test of a nuclear fuel rod cladding, which is characterized by comprising an inner sleeve and an outer sleeve which are matched with the cladding in length and are coaxially arranged, the inner diameter of the inner sleeve is larger than that of the cladding, and the inner sleeve is inserted and connected during the test; a spiral electric heating wire is arranged at the middle position in a cavity between the inner sleeve and the outer sleeve and wound around the inner sleeve, the spiral electric heating wire is at least composed of two sections with different heating power specifications in the axial direction, and the two ends of the spiral electric heating wire are each connected with an armored cable. The outer ends of the two armored cables penetrate out of the circumferential surfaces, close to the two ends, of the outer sleeve and are connected with positive and negative electrode leads, and a cavity between the inner sleeve and the outer sleeve is further filled with an insulating material in a sealed mode. According to the utility model, the thermal instability of nuclear reaction during the working of the cladding can be better simulated to detect the thermal destruction performance of the cladding, and the quality safety of products can be better ensured.

The utility model discloses a heating device for a circumferential non-uniform thermal destructive test of a nuclear fuel rod cladding, which is characterized by comprising an inner heating tube with the length matched with that of the cladding, a connector is arranged at the incoming end of the inner heating tube, and a plug is arranged at the outgoing end of the inner heating tube. Two linear electric heating wires which are arranged in the axial direction are arranged in the middle position in the inner heating tube in parallel at intervals in the diameter direction, and the two linear electric heating wires are the same in length but different in heating power specification. According to the utility model, the thermal instability of nuclear reaction during the working of the cladding can be better simulated to detect the thermal destruction performance of the cladding, and the quality safety of products can be better ensured.

This invention discloses an encapsulation and molding technology for inorganic solid-liquid phase change materials. It enhances the photothermal conversion capability of inorganic hydrated salts through a two-stage encapsulation and molding process using a porous support material at the micro-pore stage, followed by shaping and a two-stage macro-encapsulation and molding process using commercial sealant and carbon materials. This two-stage encapsulation method plays a crucial role in maintaining the shape stability of the inorganic hydrated salt phase change material, resulting in a composite phase change material with a certain photothermal conversion capability. This multi-stage encapsulation and molding method is very simple, using low-cost porous matrix and commercial adhesives. It is highly effective in solving the problems of liquid leakage and thermal instability in inorganic hydrated salt phase change materials and can be extended to the multi-stage encapsulation and molding of other inorganic hydrated salt phase change materials. This simple, inexpensive, and efficient method will facilitate the application of inorganic hydrated salt phase change materials in practical applications.

The application discloses a welding positioning tool applied to sheet metal parts of engineering machinery, and belongs to the technical field of welding, which comprises a measurement comparison module, a prediction and distribution clamping force module, a clamping execution mechanism, a load sensor and a cooperative compensation controller. The tool extracts the spatial posture deviation and the non-rigid deformation force characteristics of the workpiece, combines the thermal expansion and material phase change characteristics, calculates and dynamically distributes the clamping force for constraining the thermal instability of the workpiece. During the welding process, the load sensor is used to monitor the load fluctuation of each clamping point in real time, the cooperative compensation controller synchronously adjusts the output force of the clamping mechanism according to the load fluctuation, and the spatial motion posture of the welding end is corrected, so that the thermal deformation displacement of the workpiece is effectively offset.

The invention discloses a spacecraft heat balance dynamic simulation evaluation method, and particularly relates to the technical field of spacecraft heat balance. Constructing a spacecraft kinematics model with an expandable structure and a thermal network model; establishing a thermal-structure-motion multi-field coupling interface, and realizing dynamic driving of a structure deployment state on thermal connection parameters; in the joint simulation process, the thermal coupling matrix is updated in real time, so that the thermal connection state continuously changes along with structure deployment; key thermal node temperature sequence data are recorded, thermal response characteristics of the key thermal node temperature sequence data in the whole deployment process are evaluated, and the problems of temperature anomaly and thermal instability are identified; reversely positioning a potential thermal control defect area and a deployment strategy risk point by combining the deployment state and the thermal connection state change, and outputting a thermal response map and a design optimization suggestion; according to the method, the accuracy and responsiveness of thermal simulation in the structure deployment process are improved, thermal connection dynamic modeling and risk diagnosis in the deployment process are achieved, and the method is suitable for thermal control design and thermal safety evaluation of the spacecraft with the deployable structure.

The present invention pertains to a polytetrafluoroethylene resin powder that can be used as a binder for a secondary battery, said polytetrafluoroethylene resin powder having an ethanol penetration rate coefficient, as measured by the Lucas-Washburn method, of 0.015 g2 / s and a thermal instability index of 34 or lower.

The application provides a kind of evaluation method of lithium ion battery ternary positive electrode material thermal instability, in-situ X-ray diffraction technique is used to evaluate lithium ion battery ternary positive electrode material thermal instability, comprising the following steps: providing lithium ion battery of ternary positive electrode material, the lithium ion battery is charged to different SOC state;After charging, the lithium ion battery is disassembled, and the ternary positive electrode material on the positive electrode sheet is collected;The ternary positive electrode material is placed on the sample stage of in-situ X-ray diffractometer, the sample is heated at a heating rate of 0.5-1.5 ℃ / min in a vacuum environment, the scanning speed of in-situ X-ray diffractometer is set to 2.8-4.8 ° / min, the scanning angle 2 theta is at least 15-72 °, the ternary positive electrode material is subjected to full scanning treatment, and a scanning spectrum is obtained;The thermal stability range of the ternary positive electrode material is determined according to the scanning spectrum.

The present invention provides a thermally stable inorganic perovskite film and a preparation method thereof. The inorganic perovskite film is an inorganic perovskite that undergoes a continuous phase transition from α→δ→α and is uniformly and densely covered on a substrate surface. The inorganic perovskite chemical formula is ABX3, wherein A is selected from Cs + , Rb + One or a combination of two of the above, preferably Cs + ; B is selected from Pb 2+ , Sn 2+ etc., or a combination of two thereof, preferably Pb 2+ ; X is selected from Cl ‑ ,Br ‑ , I ‑ One or a combination of two or more of the following, preferably Br ‑ and I ‑ The inorganic perovskite film of the present invention has excellent thermal stability and will not decompose at 280°C, which fundamentally solves the thermal instability problem of organic-inorganic hybrid perovskite films; in addition, the solar cell based on the prepared inorganic perovskite film achieves excellent photoelectric conversion performance and has a very high open circuit voltage, providing important guidance for the development of semi-transparent cells and stacked cells.

The disclosure provides a modified polytetrafluoroethylene having a low extrusion pressure despite having a high tensile strength at break, and an expanded article including the same. Provided is a modified polytetrafluoroethylene including: a tetrafluoroethylene unit; and a hexafluoropropylene unit, the hexafluoropropylene unit being contained in an amount of 1.0% by mass or less in all polymerized units, the modified polytetrafluoroethylene having a tensile strength at break of 20.0 N or higher and a thermal instability index of lower than 40.

The invention discloses an application method, system, equipment and medium of a 10 kV bypass cable adapter universal structure box, and relates to the technical field of intelligent access of a power distribution network, and the method comprises the steps: collecting cable structure data and operation parameters, and constructing a cable feature object; performing finite element calculation based on the cable feature object to generate a design scheme of a joint and terminal structure; inputting the design scheme of the joint and the terminal structure into an adaptive matching engine, generating an optimal access configuration and forming an execution control instruction; executing load balancing control based on the real-time operation data and generating a load balancing control vector; and performing short-time overload risk prediction based on the prediction model and generating a short-time overload protection instruction. By introducing a design feature-performance result contrast database and an adaptive optimization mechanism, an access structure can synchronously reach the optimum on the electric field peak value and the temperature rise index, so that the risks of cable local electric field concentration and short-time thermal instability are reduced.

This utility model relates to a cable conduit burial structure in the field of cable conduit laying. It includes two sets of positioning pipes respectively fitted onto both ends of the cable conduit. Each positioning pipe includes two mounting pipes symmetrically distributed and fixedly connected by bolts. A sealing ring is fixedly connected inside each mounting pipe, and an insert pipe is fixedly connected to the outer surface of each mounting pipe. A collection hopper is fixedly connected to the end of the insert pipe furthest from the mounting pipe, and a filter screen is fixedly connected inside the collection hopper. Two irrigation components are provided between the two sets of positioning pipes. Rainwater is collected during rainy weather via the collection hopper and insert pipe, allowing it to be stored in the mounting pipes and the collection pipe. When the soil around the cable conduit is relatively dry, the collected rainwater can be used for drip irrigation of the surrounding soil, effectively increasing soil moisture, preventing soil thermal instability, and improving the power supply reliability of the power system.

A pressure measuring cell (20) for use in a battery pack (10), comprising several linearly stacked battery cells (12, 14, 16), is provided. The pressure measuring cell (20) comprises a fluid-tight, flexible pouch container (22) with several electrical feedthroughs (34), at least one pressure-sensitive element (30) comprising several electrical pins (32) arranged within the flexible pouch container (22), and several electrical leads (38) electrically connecting the several electrical feedthroughs (34) and the several electrical pins (32). A battery pack (10) is provided, comprising several linearly stacked battery cells (12, 14, 16) and at least one such pressure measuring cell (20).A method for at least one of detecting an impending thermal instability state, supporting the assessment of a safety state and supporting the assessment of a health state of a battery pack (10) comprising several linearly stacked battery cells (12, 14, 16) uses at least one such pressure measuring cell (20).

The present application provides a method for manufacturing a field effect transistor and a field effect transistor. When forming a first conductivity type semiconductor source region by ion implantation, the manufacturing process and cost of the field effect transistor are not increased, so that the doping concentrations of the first conductivity type semiconductor source regions in different regions are different. Since the channel density of the field effect transistor is reduced, the base voltage drop of the parasitic triode is effectively reduced, the risk of the parasitic triode being turned on is reduced, the thermal instability resistance and the safe operating area of the field effect transistor are enhanced, and compared with the device having a virtual cell, its on-resistance is significantly reduced.

The present invention discloses a thermal compensation module for a high-precision constant temperature environment and a control method thereof. The thermal compensation module comprises a temperature sensor, a flow sensor, a controller, a PID regulator, a relay, a refrigeration device and a heating device; the signal output end of the temperature sensor is connected to the first signal input end of the controller, the flow sensor is connected to the second signal input end of the controller, the first signal output end of the controller is connected to the signal input end of the PID regulator, the second signal output end of the controller is connected to the signal input end of the refrigeration device, and the third signal output end of the controller is connected to the signal input end of the heating device. The control method is a control means for cooling the heat dissipation device and heating the heat absorption device. The present invention performs real-time thermal compensation on the heat-sensitive device that causes thermal instability and thermal unevenness in the constant temperature clean room, so that it is always in a thermal equilibrium state, thereby improving the uniformity and stability of the environmental temperature of the entire clean room.

The invention discloses a functional regulation type thermal shock resistant and alkali resistant castable based on silica sol cooperating with aluminum titanate and a preparation method and application thereof. The castable is prepared from 50 to 60 percent of mullite, 10 to 13 percent of silicon carbide, 8 to 10 percent of andalusite micro powder, 0.5 to 1.5 percent of boron nitride nanosheet, 1 to 3 percent of rare earth oxide, 10 to 14 percent of silica sol (dry basis), 8 to 12 percent of function regulator (containing metakaolin and aluminum titanate) and 0.1 to 0.3 percent of dispersing agent. The invention breaks through the technical prejudice of thermal instability of aluminum titanate, realizes multiphase synergistic enhancement, and is suitable for high damage areas such as kiln mouths of rotary cement kilns, coal injection ducts and the like.

The invention relates to the technical field of material drying, and discloses a high-voltage electric field thin film drying system, comprising a membrane assembly, a dryer and a vacuum pump; the hot side membrane surface of the membrane assembly is used to pass hot water of a preset temperature, and the cold side membrane surface of the membrane assembly is connected to the dryer and the vacuum pump in sequence through a first pipeline; a high-voltage electric field is arranged in the dryer; the invention cleverly couples the high-voltage electric field drying technology with the membrane distillation technology, and jointly dries the material, which is not only low-cost, but also greatly improves the drying efficiency and drying quality of the material, and is particularly suitable for drying high-value-added materials containing thermally unstable active components.

The invention relates to the technical field of numerical control system control, in particular to a numerical control system thermal error intelligent compensation method based on multi-source temperature sensing. The method comprises the following steps: respectively training two prediction models according to collected data; the predicted instantaneous temperature residual output by the loss temperature residual prediction model can ensure the reference, and meanwhile, the problem of control lag cannot be generated; the machine tool background temperature prediction model is a low-frequency model with a sampling period as a time unit, planned injection energy and the open-loop thermal instability degree serve as driving characteristics of machine tool heat source physical attributes in the sampling period, and the predicted machine tool background temperature in the future period is predicted. And compensation control can be performed on the laser power and the machine tool feed amount according to prediction results of the two models. According to the method, through effective training and application of the two prediction models, the technical problems that transient overheating control lags behind, and a strong heat source in the load increasing process is not considered for machine tool thermal drift compensation are solved.

The present invention discloses a multi-layer hybrid configuration high temperature resistant composite lithium negative electrode and its preparation method and application, belonging to the technical field of battery negative electrode materials. The present invention realizes the composite of inorganic high melting point material and lithium metal by making a colloidal solution of inorganic high melting point material and coating it on the surface of lithium foil, and then rolling and pressing it, and at the same time forms a multi-layer hybrid structure, so as to achieve the purpose of increasing the melting point of the composite lithium negative electrode, fundamentally solve the problem of thermal instability of lithium negative electrode at high temperature, and expand the operating temperature of lithium metal batteries (LMBs) to 200°C, effectively alleviating the electrode side reactions and safety problems caused by collision and extrusion at high temperature.

A laser system may include a compensation component to receive a control signal indicating a target output power of an output laser pulse to be provided by the laser system, and generate a compensated current signal based on the control signal. The compensated current signal may be generated to reduce a difference between the target output power of the laser pulse and an actual output power of the laser pulse over a period of time during the laser pulse. The laser system may include a diode pump drive circuit to generate a drive current based on the compensated current signal. The laser system may include a diode pump module to generate pump light based on the drive current. The laser system may include an optical output to provide the output laser pulse.