16 results about "Heat pulse" patented technology

Circuits and methods that enable stacking of phase change material (PCM) switches and that accommodate variations in the resistance of the resistive heater(s) of such switches. Stacking is enabled by providing isolation switches for the resistive heater(s) in a PCM switch to reduce parasitic capacitance caused by the proximity of the resistive heater(s) to the PCM region of a PCM switch. Variations in the resistance of the resistive heater(s) of a PCM switch are mitigated or eliminated by sensing the actual resistance of the resistive heater(s) and then determining a suitable adjusted electrical pulse profile for the resistive heater(s) that generates a precise thermal pulse to the PCM region, thereby reliably achieving a desired switch state while extending the life of the resistive heater(s) and the phase-change material.

Systems may include a hot solution supply and a cold solution supply utilizing flow controllers, temperature control units, valve systems, various temperature and pressure sensors, an inspection zone and recirculation systems. A method for thermal management and thermal impulse testing may include configuring a hot and cold solution system and monitoring temperature profiles in each system and alternating the flow of the hot and cold cycles then monitoring the components tested in the inspection zone.

This invention discloses a method, system, device, and medium for early warning of hydrogen sulfide concentration based on sedimentary layer metabolic thermal deviation, belonging to the field of sedimentary layer gas monitoring technology. The method includes: sequentially applying a first thermal micro-perturbation and a second thermal micro-perturbation to the physical center of the interface to construct a nonlinear instability coefficient and record the critical deceleration determination time; latching a reference state in response to the physical center of the interface meeting preset evolution conditions and recording the interface structure triggering time; constructing a biological amplification factor based on the reference state by applying isoparametric thermal pulses to determine activity-enhanced interface erosion; applying controlled hydrodynamic pulses to diagnose the reservoir driving type using gradient peak migration characteristics; and outputting a graded early warning based on the reservoir driving type when the causal leading time sequence conditions are met. This invention eliminates pore structure interference through dual-amplitude thermal micro-perturbations, distinguishes the causes of interface erosion through self-referenced causal discrimination, and adaptively identifies the reservoir driving mechanism through dynamic thermal diffusion reference cycle number, thus achieving advanced graded early warning.

A device and method for high speed metamagnetic resistive switching provides a metamagnetic phase transitioning (MPT) portion formed on a substrate between terminals. The MPT portion is tuned for temperature-responsive transitions between magnetic phases through a transition phase. The phases are delineated by phase boundaries each traversed at different critical temperatures depending on direction of traversal. The critical temperatures of each phase boundary are mutually offset by a hysteretic shift. The MPT portion is boosted across one phase boundary responsive to thermal actuation pulsed in a first direction to reach or exceed both critical temperatures of that phase boundary in the first direction, and boosted across the other phase boundary responsive to thermal actuation pulsed in a second direction to reach or exceed both critical temperatures of that phase boundary in the second direction. The electrical conduction path is thereby adjusted in resistivity for switching between ON and OFF states.

The present application relates to the field of screw detection equipment, specifically is a kind of bulking machine screw detection equipment, including base, and for limiting screw and driving its rotation drive assembly, base is provided with the detection mechanism for detecting the outer diameter of screw, heating mechanism for the local shaft section of screw is radiated heating, friction mechanism for simulating the physical contact and friction of the material of simulation accumulation screw, the temperature gradient in the actual working condition of the present application is simulated using two heating covers;Through several grinding blocks, simulate the physical contact and friction heat of screw in actual working condition, while using the periodic contact of grinding block when screw rotates, simulate the transient radial heat pulse of screw when working;Finally, use range finder to monitor screw in real time, by detecting the expansion degree, jumping condition and bending condition of screw, the thermal expansion performance of screw under simulated actual working condition is comprehensively judged, so that the detection result is closer to the real working condition.

The present application relates to the technical field of fluid measurement, and discloses a rock fracture seepage velocity detection method and system based on optical fiber sensing, which comprises the following steps: constructing a sensing detection network based on optical fibers and auxiliary heat sources of a sensing monitoring network; injecting a thermal pulse into rock fractures based on the sensing detection network to obtain a thermal disturbance field; exciting the rock fractures based on the thermal disturbance field; demodulating sensing optical fiber signals to obtain multi-physical field coupling response data; jointly analyzing the multi-physical field coupling response data based on a multi-physical field coupling forward model to obtain seepage characteristic strain components; performing velocity inversion on the seepage characteristic strain components based on the spatial distribution of the multi-physical field coupling forward model to obtain fracture seepage velocity; and performing difference integration on the fracture seepage velocity to generate seepage velocity distribution monitoring results of the rock fractures.

This invention relates to the field of semiconductor heat dissipation control technology, specifically a silicon carbide multilevel converter control method and system based on embedded microchannel heat dissipation. The method includes: calculating the thermal wake coupling potential index of each SiC power transistor under the current power level based on an embedded flow path thermal wake coupling risk assessment strategy; dynamically evaluating the local thermal boundaries of all power modules in the multilevel system based on the thermal wake coupling potential index to obtain a first set of thermally hazardous module modes; obtaining real-time fluctuation tracking data involving fluid transport characteristics to construct an electro-current coupling analysis model; outputting the heat dissipation uniformity of each power module based on this model; outputting the deviation ratio of module thermal aging; and performing carrier phase shift compensation control on the carrier scheduling sequence of the multilevel converter based on the deviation ratio. This invention solves the problem in the prior art of being unable to perceive the physical delay of the thermal pulse generated by the upstream switching transistor propagating in the microchannel.

The application discloses a roller coaster track thermal deformation monitoring method based on infrared feature extraction, and through the construction of each track section reference temperature field model, the track surface infrared image is collected in real time during train operation, and a thermal radiation distribution map is obtained by processing; macro temperature gradient features, local thermal spot topological features and thermal pulse response features are extracted from the thermal radiation distribution map, input into a temperature strain conversion model, and the real-time thermal deformation amount and direction vector of each node are inferred; an anomaly detector combined with an isolated forest algorithm and a long short-term memory network is used to identify thermal deformation anomalies and calculate a comprehensive risk index, and yellow, orange and red three-level early warnings are triggered according to an adaptive threshold. The application realizes full-section non-contact, real-time and high-precision thermal deformation monitoring and adaptive graded early warning of the roller coaster track, and significantly improves the operation safety level of the amusement facilities.

The present application relates to terephthalic acid hydrorefining catalyst preparation technical field, specifically to a kind of preparation and application of supported palladium catalyst of plasma cooperation.This application overcomes the problems that active component of supported palladium catalyst is easy to agglomerate, poor in anti-poisoning ability and metal is easy to peel off and deactivate under high temperature environment.By liquid plasma, surface energy excitation is carried out on non-carbon carrier, and nano-defects with quantum trap effect are constructed;Then, using polyethyleneimine or phytic acid and other bifunctional organic ligand chelate palladium precursor solution, combined with ultrafast joule heat pulse flash process, ligand is induced to carbonize in situ on metal surface;Finally, assisted by plasma directional crystal face induced reduction;The dispersion of active center is effectively improved, the space confinement and shape selection shielding of active site are realized, the metal loss rate and the residual amount of carboxybenzaldehyde are reduced, and the anti-poisoning performance and service life of the catalyst under industrial conditions are enhanced.

The technology described herein is directed towards a reconfigurable intelligent surface (metasurface) design and implementation in which phase change (chalcogenide) material is (e.g., monolithically) integrated in each unit cell of the reconfigurable intelligent surface. The conductive or nonconductive states of the phase change (chalcogenide) material can be individually controlled (thermally-pulsed) per unit cell, which determines the phase of the unit cell based on the unit cell's conductive or nonconductive phase change material until subsequently pulsed, without needing continuous applied power. For example, with three phase change elements per unit cell, eight different state combinations can be controllably achieved, whereby dynamic reconfiguration of the reconfigurable intelligent surface to a given phase profile can be used to beamform a reflected beam in one shape and direction, and then to a different phase profile that changes the unit cells' states to beamform another reflected beam in another shape and / or direction.

This invention relates to the field of semiconductor heat dissipation control technology, specifically a silicon carbide multilevel converter control method and system based on embedded microchannel heat dissipation. The method includes: calculating the thermal wake coupling potential index of each SiC power transistor under the current power level based on an embedded flow path thermal wake coupling risk assessment strategy; dynamically evaluating the local thermal boundaries of all power modules in the multilevel system based on the thermal wake coupling potential index to obtain a first set of thermally hazardous module modes; obtaining real-time fluctuation tracking data involving fluid transport characteristics to construct an electro-current coupling analysis model; outputting the heat dissipation uniformity of each power module based on this model; outputting the deviation ratio of module thermal aging; and performing carrier phase shift compensation control on the carrier scheduling sequence of the multilevel converter based on the deviation ratio. This invention solves the problem in the prior art of being unable to perceive the physical delay of the thermal pulse generated by the upstream switching transistor propagating in the microchannel.

The application discloses a kind of fluorescent optical fiber temperature measurement systems and AI intelligent temperature measurement methods for electric power equipment, including intelligent sensor, temperature sensor and optical fiber link, intelligent sensor, temperature sensor and optical fiber link;Intelligent sensor includes temperature measurement demodulation device and data processing device;Temperature sensor is fluorescent optical fiber temperature measurement probe, contains temperature measurement fluorescent area and light absorption heating area and both are mutually contacted;Temperature measurement demodulation device exports excitation light to obtain fluorescent signal demodulation temperature measurement temperature, and exports heating light to generate self-checking heat pulse;Data processing device is based on temperature change after pulse to obtain temperature drop rate, rate is less than threshold value alarm, rate is greater than or equal to threshold value timing after re-measurement temperature, the present application solves the problem of temperature measurement reliability decline caused by probe adhesion contact degradation in electric power equipment temperature measurement.

A measurement device and method for thermal characteristics of frozen soil based on a thermal pulse method, comprising heating the cylindrical heating probe with the heater at a constant power; the first temperature probe detects the temperature of the cylindrical heating probe and uploads it to the cloud via the transmission unit, while data recorder displays the temperature data of the first temperature probe and the second temperature probe in real-time; the temperature of the cylindrical heating probe is maintained at a constant level; by heating the frozen soil sample with the cylindrical heating probe, the temperature breakthrough curve of the frozen soil sample is obtained, then the volumetric diffusivity and volumetric thermal conductivity of the frozen soil sample is obtained. This invention can effectively keep the maximum spatial temperature below the freezing point, thereby enabling the estimation of the overall thermal characteristics of quartz sand and ice content.

This invention discloses an MPCVD growth method for peelable polycrystalline diamond with a weakly bonded interface structure, belonging to the field of diamond material preparation technology. By constructing a slow-release interface layer, low-temperature high-methane concentration nucleation, and high-temperature low-methane gradient growth, a diamond film thickness of 100-1000 µm can be achieved. By controlling the cooling stress through a mechanical model and supplementing it with laser cutting or thermal pulse induction, the diamond film can be automatically peeled from the silicon substrate with a peel surface roughness ≤1 nm, requiring no polishing. This process eliminates the need for chemical etching of the silicon wafer, is simple, environmentally friendly, and produces a self-supporting thick diamond film with high thermal conductivity and high surface quality, suitable for applications such as chip heat dissipation, optical windows, and quantum devices.

This application relates to a method, apparatus, and computer equipment for de-icing wind turbine blades. The method includes: acquiring a temperature change curve of the wind turbine blades under a heat pulse; determining the icing type of the blades based on the temperature change curve; the icing type includes either frost-like ice or open ice; and performing de-icing treatment on the blades according to a de-icing scheme corresponding to the icing type; the de-icing scheme includes a first synergistic scheme corresponding to the frost-like ice type, or a second synergistic scheme corresponding to the open ice type. This method can avoid energy waste and secondary freezing of water accumulated from melting open ice.

This invention discloses a user identity management method and related equipment based on a smart wearable device. The method includes: applying weak thermal pulses to local skin within a preset time window using sheet-like micro-heating elements positioned at corresponding locations on the inner side of a smart bracelet and the inner side of the wrist; continuously acquiring the local skin temperature output by a temperature sensor at a first sampling frequency throughout the heating and cooling process, constructing a temperature-time response curve; and performing normalization and fitting processing on the response curve to obtain at least one dynamic parameter characterizing the individual's local microcirculation and heat capacity characteristics for user identification. This method solves the problem that conventional identification methods such as keys or fingerprints require active user input, which is cumbersome and inconvenient.