MICROMORPHOLOGICAL STUDY OF SOME ANNUAL POLYGONUM L. (POLYGONACEAE) IN IRAN

With 29 species in Iran, Polygonum L.is comprised of annual and perennial plants Stop Wire Harness in different habitats.P.aviculare makes a species complex, hardly distinguished from P.arenastrum and P.patulum.In the present study, po-llen grains, fruit surface and petals and leaves epidermis features were used to provide diagnostic features in or

Abstract The experiments of underwater discharges in an anechoic pool were carried out and analysis of the time-frequency characteristics of the acoustic signals was conducted based on Variational Mode Decomposition and Hilbert–Huang Transform (VMD-HHT).We propose a relative center frequency difference method to determine the decomposition number