4 results about "Diffusion theory" patented technology

The invention discloses a novel photovoltaic cell model seven-parameter solving method, which comprises the following steps of: simplifying seven parameters in a double-diode into five parameters according to the portrait diffusion theory to obtain a simplified model; the method comprises the following steps: deriving a solution formula of each unknown parameter under various specific conditions; after a solution formula of each unknown parameter is deduced, the parameters of the simplified model are solved, and an output characteristic curve of the component under the standard test condition is drawn; deriving according to a formula under a standard test condition to obtain a solution formula of each parameter under a real environment condition, solving unknown parameters, and drawing an output characteristic curve of the component under the real environment condition; and finally, carrying out accuracy verification on the novel photovoltaic cell model seven-parameter solving method. According to the method, the problem that all unknown parameters are difficult to solve from form data provided by a component manufacturer in the prior art is solved, and the method has enough accuracy for estimating the output power of the photovoltaic array in different environments.

The invention discloses a gas diffusion coefficient testing device and method based on a multi-component gas diffusion theory. The device comprises diffusion double chambers, a heat preservation box, a temperature sensor, a gas pipe, a gas cylinder and the like. The multi-component gas diffusion coefficient testing method comprises the following steps: placing sample soil in diffusion double chambers, controlling the temperature through a heat tracing band and a temperature sensor, injecting to-be-tested gas, sampling and detecting the concentration of each component gas at regular time, obtaining the diffusion coefficient through a multi-component gas model, and simulating the diffusion coefficients under different gas components and working conditions. Compared with a traditional gas diffusion device and a diffusion theory based on the Fick law, the device has the advantages of being simple in structure, easy and convenient to operate, good in gas tightness, controllable in temperature and capable of detecting the diffusion coefficient of multi-component gas, and has great popularization and research value under the background of seeking economic, green and sustainable development and improving the atmospheric environment.

This invention relates to the field of computer-aided process design technology, specifically to a method and system for optimizing the formulation of biodegradable tableware materials. The method includes the following steps: generating equilibrium molecular conformations based on atomic coordinates and calculating initial formulation component parameters; converting modulus parameters to generate theoretical elastic recovery strain parameters; mapping models to calculate deformation and marking diffusion characteristic length parameters; calculating diffusion coefficients and flux parameters to update local hydrogen ion concentration indices; updating reaction rate constants and integrating them to generate finalized formulation structural parameters. In this invention, a microscopic molecular dynamics model is constructed to analyze interface voids to quantitatively assess compatibility; relaxation time spectra are used to invert elastic recovery strain to predict deformation risk; autocatalytic reaction and diffusion theories are combined to track hydrogen ion concentration evolution; a dynamic mapping between degradation and failure is established; and full life-cycle verification is completed in a virtual environment, significantly shortening the R&D cycle and reducing trial-and-error costs.

The invention discloses a method for predicting the fatigue life of a ceramic matrix composite structure in a thermal oxygen coupling environment. According to the method, non-uniformity of the internal oxidation degree of a CMC structure in a complex environment and local material performance degradation caused by the non-uniformity are fully considered. The diffusion behavior of oxygen concentration in the structure is simulated by constructing a structure oxidation diffusion coefficient model and simulating a transient heat conduction process based on a diffusion theory. Meanwhile, a high-temperature stress oxidative damage model is established in combination with a reaction-diffusion theory and is used for calculating residual rigidity and residual strength of the structure. From the perspective of different degrees of oxidation of each area in the structural member in a complex service environment, oxidative damage evolution and unit failure processes are simulated, and multi-factor coupling effects such as gas concentration distribution, material component consumption oxidation and mechanical property degradation are integrated; accurate prediction of the oxidation life of the CMC structure under different working conditions is realized.