7 results about "Relaxation behavior" patented technology

The invention discloses a high-entropy relaxation type lead-free perovskite ceramic and a preparation method thereof. The high-entropy relaxation type lead-free perovskite ceramic is a solid solution of Na < 0.2 > Bi < 0.2 > Ba < 0.2 > Sr < 0.2 > Ca < 0.2 >) TiO3 and (K < 0.5 > Na < 0.5 >) NbO3; the content of the (K0. 5Na0. 5) NbO3 accounts for 5 to 15 mol percent of the high-entropy relaxation type lead-free perovskite ceramic. By introducing (K0. 5Na0. 5) NbO3, energy band regulation and relaxation behavior adjustment are effectively realized, the breakdown electric field intensity is remarkably improved, the energy storage performance is improved, good stability is kept under the conditions of temperature, frequency and a circulating electric field, and the actual requirements of a pulse power capacitor on a high-performance and long-life energy storage dielectric material are met.

This invention belongs to the field of reactor structural mechanics technology, specifically relating to a method for analyzing and evaluating high-temperature bolted connection sealing structures. The invention includes the following steps: selecting the location of the reactor pressure vessel flange and main bolt connection as the object of sealing structure analysis; analyzing and summarizing the influence of gasket data on the deformation and contact surface pressure of various components of the flange bolted connection structure; researching current standards and analyzing their limitations; using the finite element software ANSYS to perform finite element modeling of the reactor pressure vessel flange and main bolt structure; applying loads and constraints to the finite element model of the reactor pressure vessel flange and main bolt structure; calculating the deformation and stress of the structure using different creep and relaxation models; analyzing the relaxation behavior of the high-temperature flange bolted connection structure using experimental methods; and comparing and analyzing the results of the finite element method, the standard method, and the experimental method. This invention enables the analysis and evaluation of the sealing performance of flange bolted connection structures under high-temperature environments.

The invention discloses an Er (III)-based dissimilar metal monomolecular magnet material as well as a preparation method and application thereof. The structural formula of the material is [ZnEr (H2L) (MeOH) 2 (NO3) 2] (NO3). MeOH, the material is crystallized in a monoclinic system, the space group is P21 / n, and the cell parameters are as follows: # imgabs0 # imgabs1 #, alpha is equal to 90 degrees, beta is equal to 100.855 (6) degrees, and gamma is equal to 90 degrees. The erbium-based dissimilar metal 3d-4f single-molecule magnetic material has the characteristics of cheap and easily available raw materials and stable structure and performance, shows obvious temperature dependence and frequency dependence phenomena under the induction of an external field, generates typical slow relaxation behaviors, has the characteristics of a single-molecule magnet, and can be applied to the field of ultrahigh-density information storage.

Embodiments of the present disclosure provide a visual fatigue intervention method based on effective working hour accumulation and safety fusing, applied to the technical field of intelligent wearable devices. The method comprises real-time collection of motion state data and gaze state data of the wearer, based on the joint determination result, performing accumulation or holding operation on the effective working hour counter; when the accumulated value reaches the preset intervention trigger threshold, the current scene risk level and the real-time motion state of the wearer are combined to determine the intervention execution opportunity, the optical modulation lens of the spectral intervention glasses is switched to a specific spectral intervention state, and the external interaction signal is shielded; during the duration of the specific spectral intervention state, the physiological rest behavior characteristics of the wearer are monitored in real time, and when the behavior characteristics that meet the preset relaxation conditions are detected, the optical modulation lens is driven to return to the transparent working state, the shielding of the external interaction signal is removed, and the effective working hour counter is cleared. In this way, it can ensure that the user completes the real eye relaxation behavior.

The invention relates to the technical field of ferroelectric liquid crystals, in particular to a relaxor ferroelectric / anti-ferroelectric liquid crystal material and a preparation method and application thereof. The relaxor ferroelectric / anti-ferroelectric liquid crystal material provided by the invention retains the ferroelectricity of ferroelectric nematic phase liquid crystal, generates isotropic-ferroelectric phase transition at 43.3 DEG C, and shows the specific ferroelectric hysteresis loop and dielectric relaxation behavior of the relaxor ferroelectric.

The invention provides a stress relaxation behavior prediction method, system and device and a medium, and the method comprises the steps: analyzing the microstructure morphology change of a target material before and after stress relaxation, and determining a stress relaxation mechanism of the target material; establishing a stress relaxation damage model according to a stress relaxation mechanism; performing a high-temperature accelerated stress relaxation experiment on the target material to obtain stress relaxation behavior characterization parameters of the stress relaxation damage model in a high-temperature environment; according to the stress relaxation behavior characterization parameters of the stress relaxation damage model in the high-temperature environment, stress relaxation behavior characterization parameters of the stress relaxation damage model in the low-temperature environment are calculated. According to the method, the stress relaxation behavior of the material can be well represented, and the stress relaxation response of the material can be well predicted in a relatively large temperature range. According to the high-temperature acceleration experiment, the short-time stress relaxation behavior at the high temperature is extrapolated into the long-time stress relaxation behavior at the low temperature, and the time cost required by the experiment can be reduced to a great extent.

The invention relates to the technical field of stress relaxation tests, in particular to a high polymer material long-time stress relaxation test device and method based on a contact load, the device comprises a structural support, a pressure bearing assembly, a limiting assembly, a pressure head assembly and a measuring assembly, and the method comprises a calibration step, a loading step, a measuring step, a calculation step and a load determining step. Through the combined structure design of variable compression amount limiting and different interface contact load decoupling, the problems of load sensor test result drifting, human discrimination errors, pre-tightening state change and the like in the existing long-time stress relaxation technology are avoided; more accurate and reliable stress relaxation performance data of the high polymer material under long-time pre-tightening storage are obtained, and test support is provided for long-time stress relaxation behavior assessment and evaluation of the corresponding high polymer material / structure.