Mongolia,a key partner in the Belt and Road Initiative,is fully dedicated to fostering regional cooperation and connectivity.Standardization has emerged as a vital field with far-reaching influence for regional trade cooperation.This paper makes an in-depth analysis of the standards approved in Mongolia in 2021 and 2022,offering a fresh perspective of the past two years’standardization development in the country.The primary objective is to present an updated account of Mongolia’s standardization efforts and to facilitate regional cooperation and exchange in standardization.
This paper presents an analogical study between electromagnetic and elastic wave fields,with a one-to-one correspondence principle established regarding the basic wave equations,the physical quantities and the differential operations.Using the electromagnetic-to-elastic substitution,the analogous relations of the conservation laws of energy and momentum are investigated between these two physical fields.Moreover,the energy-based and momentum-based reciprocity theorems for an elastic wave are also derived in the time-harmonic state,which describe the interaction between two elastic wave systems from the perspectives of energy and momentum,respectively.The theoretical results obtained in this analysis can not only improve our understanding of the similarities of these two linear systems,but also find potential applications in relevant fields such as medical imaging,non-destructive evaluation,acoustic microscopy,seismology and exploratory geophysics.
A modified deep convolutional generative adversarial network(M-DCGAN)frame is proposed to study the N-dimensional(ND)topological quantities in lattice QCD based on Monte Carlo(MC)simulations.We construct a new scaling structure including fully connected layers to support the generation of high-quality high-dimensional images for the M-DCGAN.Our results suggest that the M-DCGAN scheme of machine learning will help to more efficiently calculate the 1D distribution of topological charge and the 4D topological charge density compared with MC simulation alone.