The article considers features of creating horizontal protective shields made of steel pipes for construction of tunnel-type structures in a closed manner.Types of horizontal protective shields and methods of their construction are analyzed.Variants of modern tunnel structures arranged in difficult geological conditions with the use of lining from
Abstract Unidirectional/asymmetric transmission of acoustic/elastic waves has recently been realized by linear structures.Research related to unidirectionality of wave propagation has received intense attention due to potentially transformative and unique wave control applications.However, asymmetric transmission performance in existing devices usu
Seismic bulletin data collected by the Iranian Seismological Center are used to image crust and mantle seismic attenuation, group velocity, and phase velocities for Lg, Pg, Sn, and Pn phases.This is possible because the peak amplitude time is picked, and amplitude measurements can be associated with the phase based on travel Other Blood Sugar Suppo