Clinical Distribution Characteristics of 1439 Carbapenem-Resistant Escherichia coli Strains in China: Drug Resistance, Geographical Distribution, Antibiotic MIC50/90

Wei Zhang,1,2 Zhirong Li,3 Na Wang,1 Zhicong Yang,1 Jia Li,1 Caiqing Li,1 Xuying Han,1 Jinlu Liu,1 Liping Li,4 Shuwang Wang,4 Minghua Zhan1,5 1Microbiology Department, The First Affiliated Hospital of Hebei North University, Zhangjiakou, Hebei Province, People’s Republic of China; 2Clinical Laboratory, State Key Laboratory of Complex Severe a

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ELECTRON DENSITY PROFILE RECOVERY ACCURACY AND APPLICATION OF POLYNOMIAL APPROXIMATIONS IN THE FREQUENCY-AND-ANGULAR SOUNDING OF THE IONOSPHERE

Purpose: Analysis of the error in recovering the height profile of the electron density of the ionosphere by the frequency-andangular sounding technique in dependence on the accuracy of measuring vertical plane angles of arrival of the probe signals and inexactness of specifying the propagation path length.Development of algorithms for ionospheric

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