78 results about "Relaxation process" patented technology

The invention relates to a high temperature creep life accelerated test method of a material, which comprises: a plurality of groups of short time stress relaxation tests of the material at the same temperature, acquiring a relaxation rate-stress curve based on the numerical differentiation principle, forming a relaxation creep rate-stress curve by utilizing a relaxation equation, calculating creep data to build a creep curve, and building a steady state creep rate curve and a Norton creep equation. The method starts from the physical relation between relaxation and creep, covers rather broad properties of creep strain rate by utilizing the short time relaxation process, and educes broader creep data than that educed from general creep tests by above ten times, thereby effectively reducing the amount of high temperature creep tests and time of tests and providing basic data for development of new material and engineering application.

A method and system for reducing a number of paths to be analyzed in a multi-corner static timing analysis. An estimated upper slack variation based on a non-common path delay for a racing path is utilized in determining if a multi-corner static timing analysis may be bypassed for a racing path. In another example, an estimated maximum RSS credit based on a total delay for a racing path is utilized in determining if a multi-corner static timing analysis may be bypassed for a racing path.

The invention discloses a production process of using a steckel mill to produce wear-resistant steels and produced steel plates thereof. Selected components of the invention are that C<=0.30%, Mn<= 2.5%, P <= 0.015%, S <= 0.005% and Si <= 2.2%. Continuous casting slab of alloys which includes Cr, Mo, Nb, V and the like (Cr <= 1.3%, Mo <= 0.9%, Nb <= 0.05%, V <= 1.0%) is moderately added. The invention employs warm loading and delivery. Steel plates of medium thickness are flatly rolled on the steckel mill with the employment of TMCP + off-line tempering processes, thin steel plates utilize coil rolling + cooling control + off-line tempering processes, and the uniformity, thinning and intensification of tissue are realized by controlling dynamic recrystallization and meta-dynamic recrystallization in the rough rolling stage, strain accumulation and relaxation process in the finely rolling stage, cooling rate within the range of producing lower bainite, and final cooling temperature between the formation temperature of lower bainite and the formation temperature of martensite by employing the off-line low tempering temperature which is equal to or less than 350 DEG C(<= 350 DEG C), thereby ensuring high-intensity, high ductility and abrasion resistant combination property of the steel plates.

The invention relates to a method for converting creep data into material high-temperature stress relaxation data, which comprises the following steps: a method and a step for acquiring the material creep property data of a high-temperature component material at certain temperature and performing normalization processing on the material creep property data, a method for dividing the process of relaxation, and a process of creep-relaxation conversion. The method comprehensively considers the influences at different creep stages, improves the precision of data conversion from creep to relaxation, can acquire the relaxation property data satisfying the design requirements on engineering structures, and can be expected to replace relaxation tests having high requirements on experimental installations.

The invention discloses a logarithmic derivative analysis method based insulation aging state evaluation method of an XLPE cable. The XLPE cable is sliced in an insulated manner to prepare different objective samples, electrodes are prepared from the objective samples, the objective samples are then placed in a dielectric spectrum tester to obtain a dielectric constant real part epsilon' and a dielectric constant imaginary part epsilon''; and a curve that the dielectric constant real part epsilon' and the dielectric constant imaginary part epsilon'' change with the frequency is obtained, mathematical calculation is carried out on the dielectric constant real part epsilon' to obtain change of a first-order derivative of the logarithm of the diagonal frequency omega of the dielectric constant real part epsilon' with the frequency, and the insulated aging state of the XLPE cable is represented. According to the method, influence of DC in the low-frequency range on the dielectric relaxation process is avoided effectively, compared with traditional dielectric constant real and imaginary pars, the change rule is more obvious, the aging state is indicated more clearly, the method is simple in operation, and an evaluation result is accurate.

The invention provides a numerical simulation method for thermal composite forming of titanium alloy. The numerical simulation method includes the steps of 1), subjecting the titanium alloy to a thermal unidirectional tensile test in a material testing machine; 2), drawing titanium alloy constitutive curves and identifying material parameters; 3), inputting the parameters determined in the step 2) into an analysis module on the basis of finite element software and analyzing the thermal tensile deformation process I; 4), performing material thermal stress relaxation test on the material testing machine; 5), drawing titanium alloy stress relaxation curves; 6), selecting proper creep deformation constitutive function and determining relaxation parameters of materials; 7), substituting the relaxation parameters determined in the step 6) into a creep deformation analysis module on the basis of taking simulation results in the step 3) as an initial state of the relaxation process II; 8), performing springback analysis by taking relaxation simulation data as the initial state of springback unloading. The results show that the titanium alloy subjected to stress relaxation is lowered in stress and reduced in springback, and parts are high in forming accuracy.

The invention discloses a method for measuring a multi-mode relaxation process of a mixed gas molecule. The method comprises the following steps: establishing an acoustic spectrum expression of a single relaxation; when omega tau=1, acquiring a general expression form of the single relaxation process of the acoustic spectrum, thereby acquiring an expression form of valid heat capacity of the multi-mode relaxation process; measuring a sound absorption coefficient alpha r(omega) and a sound velocity c(omega) of 2*N frequency points, thereby acquiring 2*N non-dimensional sound relaxation absorption coefficient mu m(omega); and solving N epsilon i and tau i values from 2*N equations, substituting N epsilon i and tau i values into an original equation, thereby acquiring a spectral line of the mu m(omega) about omega=2 pi f, namely, reconstructing the multi-mode relaxation process. The method for measuring the multi-mode relaxation process of the mixed gas molecule, disclosed by the invention, not only is simple in operation but also is capable of accurately reconstructing a complete spectral line of the multi-mode relaxation process. An acoustic spectrum measuring method with higher adaptability and practicability is supplied for an accurate measuring technique for a gas sensor based on acoustic spectrum decomposition.

The invention discloses a simulation method of an elastic curve in cardiopulmonary resuscitation external chest compression, which has the main content that: 1. adopting an unequal deformation juxtaposed linear compression spring group to simulate the non-linear elastic force of the thorax; 2. adopting a damper (a buffer, a reducer) to simulate the damping force of the thorax, and the average value (2.93Ns/cm) of the damping coefficient of the damper between 0 to 5cm being equal; 3. respectively installing and fixing the damper and two ends of the spring group on the front and back walls of a simulation thorax which simulate the thoracic walls of the human body to form a thoracic simulating mechanism. The method adopts the combination of the spring and buffing equipment among the similar methods for the first time, thus the hysteretic curve in the process of pressing and releasing is in line with the typical hysteretic curve of the thorax of the human body in published literatures, therefore pressing hand feeling which is closer to a real human body can be acquired in the simulating mechanism and the effects of practicing cardiopulmonary resuscitation external chest compression techniques on the mechanism can be improved.

The invention provides a decomposing and synthetic method of quasi-saturated water nuclear magnetic resonance spin echo signals. According to known saturation data and corresponding relaxation signals, influence coefficients of different oil sample saturation on the relaxation process are fixed in an optimizing and fitting mode. In terms of the relaxation signals with different oil saturation, salt water of the same size replaces oil samples, the influence coefficients are led in so as to represent influences of the oil samples with different oil saturation on the relaxation signals, and accordingly quasi-saturated water nuclear magnetic resonance relaxation signals under different oil saturation are written. Spin echo relaxation signals of a quasi-saturated water rock core are inverted, influences of different fluid types and different saturation can be removed in a certain degree, and the identification capacity of the nuclear magnetic resonance signals for a rock pore structure and fluids can be improved. According to the method, synthesis and decomposing of the quasi-saturated water rock core nuclear magnetic resonance spin echo signals are achieved, and accuracy and reliability of nuclear magnetic resonance data for assessment of the rock pore structure and fluid identification are improved.

The invention provides hydrochloric acid and sulfuric acid corrosion resistant steel and a preparation method thereof. The hydrochloric acid and sulfuric acid corrosion resistant steel comprises, by mass, 0.02-0.04% of C, 0.2-0.4% of Si, 0.8-1.0% of Mn, less than or equal to 0.01% of P, 0.005-0.015% of S, 0.25-0.35% of Cu, 0.3-0.4% of Cr, 0.1-0.2% of Ni, 0.05-0.15% of Sb, 0.05-0.15% of Sn, 0.05-0.15% of Mo and the balance Fe and inevitable impurities. According to the steel and the method, the low-carbon component design is adopted, and a proper amount of copper, antimony, tin and molybdenumare added to improve the corrosion the hydrochloric acid and the sulfuric acid resistance; and the solid solution strengthening is adopted as a main mode, the steel with the yield ratio being less than or equal to 0.70 and the elongation percentage being larger than or equal to 40% is prepared through the low-temperature rolling and relaxation processes, and a hydrochloric acid and sulfuric acid corrosion resistant hot-rolled steel plate with excellent plasticity is prepared.

The invention discloses a novel technology capable of tension and extension of a straight line rib and a crease line rib at the same time. The technical proposal lies in that after a pre-stress steel wire is lashed, a mode of synchronous classified tension of both ends is adopted, to first initially set a straight line rib, and then initially set and tension a crease line rib, and finally tension the straight line rib; a large ton hydraulic jack is adopted for overall classified extension and a spiral support is adopted to follow up and protect the extension process; the crease line rib is first extended, followed by the straight line rib. The invention selects the large ton jack, adopts the initial setting of the single pre-stress, classified overall tensioning of the jack, and follow-up and protection with a spiral support tensioning and extending technologies, which can prevent low efficiency and unsafety, etc brought by single tensioning, ensure balance stress on box beams and safety extension, improve the extending efficiency, and is applicable to tensioning and extending of pre-tensioning method pre-stress concrete box beams with the extending ton up to 52000Kn.

The invention discloses a method for calculating and evaluating a pre-tightening relaxation law of a composite material interference connection structure. The method comprises the following steps: considering the influence of temperature and time in a service environment; respectively describing an instant response behavior and a delayed response behavior of a composite material in the pre-tightening and loosening processes by using a linear elastic model and a viscoelastic model; constructing corresponding pre-tightening and relaxation models; calibrating model parameters according to experimental data; and using a parameter model with visual physical significance to reflect the pre-tightening action mechanism and relaxation attenuation law of the composite material interference connection structure. The pre-tightening action mechanism and the relaxation attenuation law of the composite material interference connection structure can be accurately quantified, a foundation is laid for researching interference connection damage and structural strength, and guidance is provided for optimization design of interference fit connection of the composite material structure.

The invention relates to a heterojunction resistive switching memory and a manufacturing method thereof. The method comprises steps: a semi-insulating substrate is manufactured; an adhesion layer, a bottom electrode and a Ga2O3 film grow on the surface of the semi-insulating substrate sequentially; a spin coating process is used to grow a CH3NH3PbI3 film on the surface of the Ga2O3 film; and a point-shaped top electrode grows on the surface of the CH3NH3PbI3 film, and the heterojunction resistive switching memory is finally formed. as the resistive switching layer adopts the heterojunction, modulation is easy, the memory and relaxation process of a resistor is regulated by factors such as the width of a depletion layer and the strength of an internal electric field, and the memristor performance regulation flexibility is enhanced; and selectivity for materials is weak, the performance of the memristor behavior is stable, semi-quantification research on the memristor is facilitated, and a basis is laid for device design and further development.

The invention relates to a system for conveying therapeutic drugs. The system comprises an injection catheter, an injection needle and an operating handle. The injection needle is communicated with the injection catheter via fluid, the operating handle is fixedly connected to the near end of the injection catheter, a buffer device is arranged at the far end of the injection catheter, and the injection needle is partially or completely arranged in the buffer device. When the far end of the buffer device is pressed, the axial length of the buffer device is reduced, and the needle tube of the injection needle stretches out of the buffer device. By means of the system, the risk of leakage of injection drugs is significantly lowered, the fit adaptability in the cardiac contraction and relaxation process is improved, and the probability of breakage of the injection needle is reduced; the system is simple in overall design, safe and convenient to operate and easy to use.

The invention discloses an efficient preparation method of a high-strength and high-toughness degradable polyester polymer, specifically comprising the following steps: adding an active chain extenderto a polymer system in advance, and realizing fusion of the chain extender and the polymer system and formation of a polymer chain branching and cross-linking structure in the polymer system throughhigh temperature treatment; realizing delay and reversibility of physical aging and structure relaxation process of a polymer through low temperature treatment; triggering physical aging of the activechain extender and linear polyester by radiation and simultaneously carrying out cross-linking and branching reaction to control the reforming, arrangement and folding of the polymer molecular chain,thereby increasing the entanglement density of an amorphous molecular chain in the polymer system and reducing the formation of a secondary ordered structure during the physical aging process. According to the degradable polyester polymer prepared by the above method, the original strength is kept, and toughness is greatly improved by 1-5 times. The method is of great significance for the actualprocessing and application of the degradable polyester polymer.

The invention belongs to the technical field of conveying devices, and particularly relates to a base paper logistics conveying system. The base paper logistics conveying system comprises a base; eccentric wheels are arranged on the front and back sides of the outer wall of a rotating shaft; adjusting roller supports are arranged on the tops of eccentric bearings; the tops of the adjusting rollersupports penetrate through a guide plate, and adjusting rollers are arranged on the adjusting roller supports; drive rollers and extrusion rollers are arranged on drive roller supports; driven rollersare arranged on driven roller supports; the outer walls of the drive rollers and the driven rollers are sleeved with driving belts; the tension of the base paper can be detected by a tension detection device in the base paper conveying process; when the base paper is tense in the relaxation process, a control device is used for controlling the rotation of the eccentric wheels of an adjusting motor to achieve the expansion and contraction of the adjusting rollers, thus, the tension adjustment of the base paper is realized, and the base paper is prevented from being torn; and the centering adjustment of the base paper can be realized by adjusting the distance between two centering adjusting plates, and the base paper can be prevented from skewing.

A therapy device includes a chair, a helmet, and a number of programmable relaxing processes carried out on a passive user. The helmet is pivotally connected to the chair and can provide music and an eye massage. The device also applies an automatic back massage. These relaxing processes, to relieve fatigue in a user, can be started and finished automatically and run for any selected period.

The invention discloses a music relaxing chair. The music relaxing chair comprises a chair base, a multimedia player, a music player, a leg support frame, a microprocessor, a wireless communication module, a wireless remote controller, a mobile terminal, a voice controller and a low-frequency music body sensing device, wherein the low-frequency music body sensing device comprises an amplifying circuit, a low-pass filter circuit, a low-frequency energy converter and a vibration cushion; the music player, the multimedia player, a chair back linkage adjusting device, a supporting leg linkage adjusting device and the low-frequency music body sensing device are in communication connection with the microprocessor respectively; the wireless communication module is connected with the microprocessor; and the wireless remote controller, the mobile terminal and the voice controller are connected with the wireless communication module respectively. The music relaxing chair can be adjusted automatically in various convenient modes, the relaxation process is smooth, and the relaxation effect is improved; the low-frequency music body sensing device is used for processing parts of low-frequency sound waves and then acting the processed sound waves to the skeletons of a human body, the processed sound waves are conducted to the physiology and the psychology of the human body through nerves, deep relaxation is reached, voice frequency can be output, and auditory sensation is brought.

The invention discloses an optical fiber measurement based three-dimensional heart chip. According to the chip, elastic cantilevers serve as a support for three-dimensional myocardial tissue and can be continuously deformed and displaced in the contraction and relaxation processes of the three-dimensional myocardial tissue so as to be detected by optic fiber probes in the elastic cantilevers; under the action of contraction and relaxation behaviors of the three-dimensional myocardial tissue, the two cantilevers repeatedly get close and move far away, the distance between the two cantilevers ischanged and the characteristics of the beating frequency, the contraction force and the like of the myocardial tissue are reflected by the change frequency and the displacement amplitude; the changeof the elastic cantilevers in which optical fiber is wrapped is monitored by utilizing the characteristics of sensitivity, accuracy and the like of optical fiber measurement technology, thereby realizing the detection of important indexes such as the myocardial beating frequency, the contraction force and the like; and after a drug is added, the indexes such as the beating frequency, the contraction force and the like of the three-dimensional myocardial tissue are changed, drug evaluation and screening can be carried out by utilizing the data obtained by the optical fiber monitoring, the effect of the drug on myocardium can be observed in real time and a good visualization effect is provided.

The invention discloses a low-stress lithium-ion battery separator and a preparation method thereof and belongs to the technical field of lithium batteries. The low-stress lithium-ion battery separator is prepared from the following components in parts by weight: 50-60 parts of polyethylene, 30-50 parts of polypropylene, 20-30 parts of polyolefin and 0.5-2 parts of a pore-forming agent. The invention further provides a preparation method of the low-stress lithium-ion battery separator. According to the low-stress lithium-ion battery separator, residual stress is relaxed to be removed through an internal local plastic deformation or local relaxation process of the separator at certain temperature during low-temperature destressing. The low-stress lithium-ion battery separator is slowly heated to relatively low temperature in general during destressing and is slowly cooled after being kept for a period of time to prevent generation of new residual stress. The prepared low-stress lithium-ion battery separator is an ultrathin high-strength separator material and is suitable for promotion and application.

The invention discloses a stability maintaining device used after mandibular face plastic surgery. The device comprises a displacement plate, the displacement plate is slidably connected to symmetrical left and right connection blocks, a fixing device is arranged on the front side of the connecting blocks, and the fixing device comprises an arc-shaped neck ring fixed at the front end of the connecting blocks, a supporting rod fixed at the side, close to the symmetric center, of the arc-shaped neck ring, and a sponge mat fixed on the supporting rod. The invention device adopts a necklace type wearing mode, abandons a mode of an elastic head sleeve, is convenient to wearing and taking process, reduces the pain in the required relaxation process every two hours, adopts the neck ring with theadjustable horizontal distance, meets the requirements for different neck thicknesses, utilizes a double-face clamping plate which is provided with massage balls with the elasticity, gives a reactingforce to the face while adapting to the concave-convex positions of the face, conducts stable keeping, and accelerates muscle reattachment.