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2 results about "Relative Change" patented technology
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In any quantitative science, the terms relative change and relative difference are used to compare two quantities while taking into account the "sizes" of the things being compared. The comparison is expressed as a ratio and is a unitless number. By multiplying these ratios by 100 they can be expressed as percentages so the terms percentage change, percent(age) difference, or relative percentage difference are also commonly used. The distinction between "change" and "difference" depends on whether or not one of the quantities being compared is considered a standard or reference or starting value. When this occurs, the term relative change (with respect to the reference value) is used and otherwise the term relative difference is preferred. Relative difference is often used as a quantitative indicator of quality assurance and quality control for repeated measurements where the outcomes are expected to be the same. A special case of percent change (relative change expressed as a percentage) called percent error occurs in measuring situations where the reference value is the accepted or actual value (perhaps theoretically determined) and the value being compared to it is experimentally determined (by measurement).
BIM-based foundation pit support excavation quality control method and system
The application discloses a kind of based on BIM's foundation pit support excavation quality control method and system, and the present application relates to foundation pit monitoring technical field, including the following steps: by arranging monitoring point in BIM model and storing theoretical deformation curve, with fixed frequency acquisition real-time deformation data;The deformation rate in preset sliding time window is used to judge rate step event and determine candidate source point, the deformation sequence cross-correlation function value of candidate source point and other monitoring points is calculated, and the initial source point of support deformation is judged in combination with time lag value;According to the relative quantity of initial source point, using time lag value decay gradient and deformation amplitude relative change rate or time lag variance analysis method, the quality defect type of foundation pit support is divided, and BIM model parameter or support erection state is updated, and theoretical deformation curve is recalculated to guide subsequent quality monitoring, greatly reduce the security risk caused by deformation, to ensure the safety and stability of construction.
Owner:CCCC THIRD HARBOR ENGINEERING CO LTD
Multi-parameter convergence test method and system based on superconducting density functional theory
PendingCN121807713AError detection/correctionComplex mathematical operationsConvergence testsDensity functional theory
The invention provides a multi-parameter convergence test method and system based on a superconducting density functional theory, relates to the technical field of superconducting calculation, and solves the technical problem of inaccurate convergence test results in superconducting density functional theory calculation in the prior art. The method specifically comprises the following steps: acquiring a parameter set and an atomic structure; classifying the parameter set; setting a scanning range and a step length of each to-be-measured parameter in the parameter set and a reference value of a non-to-be-measured parameter; traversing each to-be-measured parameter in the scanning range, performing superconducting calculation on each to-be-measured parameter in combination with the atomic structure, and outputting a target physical quantity; aggregating the value of the to-be-tested parameter and the corresponding target physical quantity to a summary log file; calculating the relative change rate of the target physical quantity corresponding to each adjacent to-be-measured parameter value, and comparing the relative change rate with a preset threshold value; when the relative change rate is smaller than a preset threshold value, it is judged that the corresponding to-be-detected parameters are converged. The method is used for the multi-parameter convergence test of the superconducting density functional theory.
Owner:HEFEI HANHAI QUANTUM TECHNOLOGY CO LTD