The chemical composition of the inner region protoplanetary disks can trace planetary building material. exact elemental disk has not yet been measured and tensions between models observations still exist. Recent advancements have shown UV-shielding to be able increase emission organics. Here, we expand on these investigate how may impact in 5 au. In this work, use model from arxiv:2204.07108 i...

Oxygen-isotope composition of the solar wind returned by GENESIS indicates that the Sun is 16 O-rich (Δ 17 O SMOW = −26±6‰) [1], supporting one of predictions of the CO self-shielding models [2−4]. The self-shielding models [3,4] assume that both the solids and gas were similarly 16 O-rich (Δ 17 O ~ −25‰), and solids subsequently evolved towards the terrestrial value as a result of CO self-shie...

A unified analysis is presented for the elastic response of a pressurized cylindrically anisotropic hollow disk under assumed conditions of plane stress, or a hollow cylinder under plane strain conditions, and a spherically anisotropic hollow sphere, made of material which is nonuniform in the radial direction according to the power law relationship. The solution for a cylinder under generalize...

CO SELF-SHIELDING IN THE EARLY SOLAR SYSTEM. Rachel L. Smith, Klaus M. Pontoppidan, Edward D. Young, Mark R. Morris, and Ewine F. van Dishoeck, Department of Earth and Space Sciences, University of California Los Angeles (UCLA) ([email protected]), Hubble Fellow, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA ([email protected]), Institu...

background: gonad shielding has been recommended during pelvic x-rays since the 1950s. the popular method of gonad shielding is placement a lead shield in the midline of the pelvis. the aim of this study was to evaluate the prevalence and utility of gonad shielding in pediatrics undergoing pelvic x-rays.materials and methodsfollowing study approval, we retrospectively retrieved data from the di...

results the results showed that the epoxy plates 6 and 2 mm thick had the highest and the lowest averages of shielding effectiveness at 4.48 db and 1.90 db, respectively. however, increasing the thickness was useful up to 4 mm. in addition, in a similar attenuation pattern, x-band frequency was divided into lower, middle, and upper sections. the lower section had the highest shielding effective...