3 results about "Effective potential" patented technology

The application relates to a kind of asteroid surface escape velocity calculation method considering rotation and terrain influence, comprising: obtaining the three-dimensional shape model of target asteroid and carrying out discrete, reading the vertex set and triangular facet set of polyhedron, carrying out gravity field modeling, establishing standard polyhedral gravity model;Define the logarithmic kernel function of each edge of each triangular facet, to determine the gravitational potential of target asteroid on any field point;Establish star-fixed coordinate system in standard polyhedral gravity model, determine the rotation speed of any point on the surface of target asteroid, thereby define the effective potential upper bound and the inertial system speed of the release instant of the particle on the surface of target asteroid;Based on the minimum escape condition that the kinetic energy of the particle on the surface of target asteroid is equal to the corresponding effective potential upper bound, determine the minimum normal escape velocity of the particle. Compared with the prior art, the application can quickly obtain accurate minimum escape velocity and corresponding escape direction at any surface point.

The invention provides a downburst maximum vertical wind speed diagnosis method and system, and the method comprises the steps: obtaining meteorological element data of a target high-voltage power transmission corridor with sparse meteorological data, extracting an environment temperature profile based on the meteorological element data, and determining the starting height and ending height of a sinking air block in downburst according to the meteorological element data; according to the initial height, the final height and the dry adiabatic rate change, a sinking air block temperature value changing along with the height is obtained; based on the initial height, the end height, the temperature numerical value set and the environment temperature profile, effective potential energy of sinking convection is calculated according to numerical integration; identifying the maximum value of sinking convection effective potential energy in a preset time sequence; based on the law of conservation of energy, the maximum value of effective potential energy of sinking convection is converted into the maximum vertical wind speed of downburst; according to the method, the diagnosis of the maximum vertical wind speed of the downburst is obtained by establishing a direct calculation method from the DCAPE to the maximum vertical wind speed of the downburst.

The present application relates to a kind of material thermodynamic parameter calculation method considering thermal expansion and phonon reorganization.The temperature-dependent effective potential (TDEP) method is used to non-perturbatively calculate phonon reorganization, independently scale asymmetric equivalent cell parameters to simulate thermal expansion, and the temperature-dependent thermodynamic data of material can be accurately calculated, which can help to quantitatively reveal the relative contribution of entropy and enthalpy to free energy, and evaluate the influence of phonon reorganization and thermal expansion on material stability.The core idea of the temperature-dependent effective potential method is to use a temperature-dependent effective harmonic potential to approximate the true atomic vibration potential, and the temperature dependence is reflected in the displacement of the atoms from their equilibrium positions due to thermal and quantum fluctuations.The use of efficient random sampling to estimate the potential energy surface can greatly reduce the computational cost compared to molecular dynamics calculations.