Bacground/Aim.Retentive force of removable partial denture (RPD) Sleep Bottoms directly depends on elastic force of stretched retentive clasp arms (RCAs).During deflection RCA must have even stress distribution.Safety factor is the concept which can be applied in estimating durability and functionality of RCAs.This study was based on analyzing prop
Abstract Background Drug injection has been increasing over the past decades all over the world.Hepatitis B and C viruses (HBV and HCV) are two common infections among people who inject drugs (PWID) and more than 60% of new human immunodeficiency virus (HIV) cases are PWID.Thus, investigating risk factors associated with drug use transition to inje
The development of cross-border e-commerce logistics services has injected new vitality into the development of international trade, and therefore has become a new hot spot in theoretical research.In order to ensure the healthy development of cross-border e-commerce, it is urgent to build a set of scientific and effective evaluation mechanisms to s
The main Golf purpose of this study is to reveal the growth mechanism of ice lens in saturated clay.The deformation and fracturing of clay skeletons caused by ice crystal growth during the freezing process are gradually discussed, and a theoretical model for the whole process of ice lens growth considering the surface charge is proposed.Firstly, th