4 results about "Membrane stress" patented technology

The invention is applicable to the field of nuclear power, and discloses a nuclear safety level cabinet shock resistance improving method, which comprises the following steps: modeling after a first cabinet, a second cabinet and two cabinets are connected in a combined cabinet mode, applying constraints to a model, calculating inherent frequencies of the first cabinet, the second cabinet and the first cabinet and the second cabinet after the combined cabinet is connected, and calculating the shock resistance of the first cabinet and the second cabinet after the first cabinet and the second cabinet are connected in a combined cabinet mode; through material physical performance data in the step S1, modeling in the step S2 and constraint and seismic load applying in the step S3, the overall primary film stress and local film bending stress of a first cabinet, a second cabinet and a plate-shell type supporting piece after cabinet combination, the tensile stress, shear stress and bending stress of a linear supporting piece and relative displacement between the cabinets are calculated, and the overall primary film stress and local film bending stress of the first cabinet, the second cabinet and the plate-shell type supporting piece after cabinet combination are calculated. And calculating the deformation of the first cabinet and the second cabinet which are influenced by the seismic load after the first cabinet and the second cabinet are independently placed and connected and the relative displacement after the cabinet combination connection, thereby judging whether the cabinet combination connection can avoid the cabinet collision or not and avoiding the influence on the realization of the safety function of the cabinet.

This invention provides a highly reliable MEMS sensor and a method for manufacturing the same, which have a capacitive transducer structure with a membrane containing metallic glass, exhibiting high impact resistance and fracture toughness, suppressing membrane stress fluctuations after substrate mounting and reflow, and being particularly suitable for the acoustic characteristics of microphones. [Solution] In a MEMS sensor 1 having a capacitive transducer structure in which a membrane MB and a back plate BP face each other with an air gap AG in between, the membrane MB is formed of a laminated film of a metal thin film X and a metallic glass MG having different stresses, and the stress of the metal thin film X cancels out the stress of the metallic glass MG, thereby reducing the overall stress of the membrane MB as a laminated film.

The invention discloses construction and application of an engineering strain capable of normally growing at 35 DEG C and realizing high yield of xanthan gum. The method comprises the following steps: by taking xanthomonas campestris XC1 as an initial strain, carrying out ARTP mutagenesis treatment, and screening a mutant strain which can normally grow under the condition of 35 DEG C; the mutant strain is subjected to multiple rounds of superposition transformation, and multiple physiological restrictions under high temperature stress are systematically broken by sequentially strengthening a protein folding system (grpE-ATGA-dnaK), activating outer membrane stress regulation (rpoE), constructing an anti-oxidation barrier (katB) and strengthening a cell membrane structure (polCDE); the finally obtained engineering strain shows the performance far better than that of an initial strain under the condition of 35 DEG C; the biomass of the strain is increased by 207.7% compared with that of an initial strain XC1, and the yield of xanthan gum is increased by 75.5% and reaches 25.8 g / L, which is consistent with the yield of xanthan gum under the fermentation condition of 28 DEG C.

The present application belongs to the technical field of welding, and discloses a T-shaped intermittent welding weld verification method and related equipment, the method comprising: obtaining the element size of a to-be-welded element and welding conditions, determining the weld parameters of the weld according to the element size and welding conditions; constructing a finite element model of the to-be-welded element according to the element size, determining the transfer load of the weld according to the finite element model; determining the cross-section coefficient of the weld according to the element size and weld parameters; determining the normal stress and shear stress of the weld according to the transfer load, weld parameters and cross-section coefficient; determining the membrane stress and the sum of the membrane stress and bending stress of the weld according to the normal stress and shear stress; calculating the safety factor of the weld according to the membrane stress and the sum of the membrane stress and bending stress, and verifying the weld parameters according to the safety factor.