4results about How to "Reduce surface stress" patented technology

The invention relates to a photovoltaic module and a preparation method thereof. The photovoltaic module comprises first packaging front plate glass, a front layer packaging adhesive film layer, a semi-finished product laminated piece, a rear layer packaging adhesive film layer and first packaging cover plate glass which are stacked in sequence, the semi-finished product laminated piece comprises second packaging front plate glass, a first adhesive film layer, a battery piece array layer, a second adhesive film layer and second packaging cover plate glass which are stacked in sequence; the second packaging front plate glass is attached to a front packaging adhesive film layer; the second packaging cover plate glass is attached to a rear packaging adhesive film layer; the second packaging front plate glass and the second packaging cover plate glass are made of non-tempered glass; the first packaging front plate glass and the first packaging cover plate glass are made of at least one of tempered glass or semi-tempered glass. According to the invention, the edge of the module has no overpressure phenomenon, the glass and the adhesive film have no stress concentration phenomenon, the thickness distribution is uniform, the phenomena of delamination, relaxation and the like caused by stress release of the edge of the module in an outdoor actual use environment can be prevented, and the reliability of the module is improved.

The application provides a method for improving the bonding force of a neodymium iron boron deposition layer based on a reinforced ion exchange deposition technology, and belongs to the technical field of rare earth permanent magnet material preparation. The method comprises the following steps: neodymium iron boron magnet cleaning pretreatment, removing contaminants and metal oxides on the surface of the magnet; activating the neodymium iron boron magnet by acid corrosion to obtain a pretreated magnet with a rough surface; soaking the pretreated magnet in an electrolyte and connecting the magnet to a negative electrode; and performing ion exchange deposition on the surface of the magnet to be deposited by applying a pulse variable frequency electric field on the surface of the magnet to prepare a deposition layer; wherein, the surface of the magnet is first modified by micro-electrolysis, and then the ion exchange deposition is performed by applying a variable frequency electric field. In the initial stage, the surface of the magnet is continuously subjected to micro-electrolytic corrosion by a stable current to regulate the interface state and then realize surface modification, which is beneficial to the effective bonding of the deposition layer formed by the subsequent ion exchange deposition.

The invention discloses a 3D printing cavernous body organ-like model capable of simulating an erectile physiological process, and belongs to the technical field of tissue engineering and regenerative medicine. The hydrogel is formed by photo-curing 3D printing of a dual-network hydrogel material formed by blending a pig cavernous body acellular extracellular matrix pregel solution and polyethylene glycol diacrylate, and has a bionic sine curve expansion structure; micron-sized grooves for guiding the directional arrangement of smooth muscle cells are formed in the surface of the micro-sphere, and an elliptical cavity for providing structural support is formed in the micro-sphere. A pig cavernous body dECM pre-gel solution is used as a base material, so that a microenvironment for living of cells in a body can be effectively simulated; by regulating and controlling the proportion of PEGDA, the mechanical property of the model is matched with that of a natural cavernous body tissue. The organ model can reproduce the NO-mediated smooth muscle cell relaxation and tissue expansion physiological process in vitro, and provides an effective in-vitro platform for researching the pathological mechanism of erectile dysfunction, screening drugs and developing a novel treatment method.

The invention discloses a process optimization method for improving surface cracking of a large steel ingot based on a finite element model, and belongs to the technical field of computer aided design optimization casting processes. The method comprises the following steps: S1, acquiring at least one group of thermophysical parameters of a steel ingot material according to chemical components of the steel ingot material; s2, establishing a casting three-dimensional model of the steel ingot; s3, grid division and parameter setting are conducted on the casting three-dimensional model, wherein parameters comprise at least one set of thermophysical parameters obtained in the step S1; s4, performing simulation calculation of a temperature field and a stress field in the casting process on the casting three-dimensional model to obtain surface stress when the solidification of the steel ingot is finished; and S5, the structure of the cast three-dimensional model of the steel ingot is optimized, the step S2 to the step S5 are repeated till the optimization termination condition is met, and the stress of the edge of the steel ingot is reduced. By means of the method, the edge surface stress generated when steel ingot solidification is finished can be reduced, and longitudinal cracks on the edge surface of the steel ingot are reduced.