The Physical Properties of Volcanic and Impact Melt

The emplacement mechanisms of lunar impact melt flows, that form from hypervelocity impact events, have been a subject of debate in the lunar science community, because of their unique physical properties that separate them from other geologic features. Understanding how lunar impact melt flows were emplaced on the surface of the Moon will not only grant us new information about the flow dynamics of impact melt but provide insight into the production and distribution of impact melt and how it built and modified the surfaces of planetary surfaces. Lunar impact melt flows exhibit surface roughness textures and morphologies that are analogous to terrestrial lava flows. For this reason, we seek to quantify the surface roughness of terrestrial lava flows using synthetic aperture radar (SAR) at two localities, Craters of the Moon National Monument and Preserve, Idaho and the 2014-2015 Holuhraun lava flow-field. We focus on using SAR data in this study for two reasons, (1) improve our understanding on how radar surface roughness can be connected to the emplacement mechanisms of volcanic and impact melt, and (2) to highlight the techniques capabilities and limitations for differentiating different lava flow types and lava facies. Impact melt has contrasting intrinsic properties and geologic origins to lava flows, so we include the analysis of a physical property of impact melts that influences melt behaviour. To complement our radar surface roughness analysis, we seek to constrain the temperature of the Mistastin Lake impact structure impact melt deposits by analyzing the crystallographic orientations and microstructures of zircon grains and zirconia crystals encased in melt-bearing impactites. We demonstrate in this work that without entirely understanding the capabilities and limitations of using SAR for lava flow differentiation, we will struggle to interpret the eruption dynamics and history of volcanic landforms on terrestrial bodies, which in turn limits what we can learn about impact melt emplacement. Furthermore, we discover that high temperature and pressure conditions can be constrained from an impact environment that was once superheated, which has strong implications for discovering high P-T shock indicators in other terrestrial impact structures and also in lunar impactites. In addition, our work has strong applications towards addressing high priority science goals established by research groups such as the Lunar Exploration Analysis Group

Astronautics and aeronautics, 1971: Chronology on science, technology, and policy

A comprehensive chronological reference of world wide aerospace events is presented. Policy statements, comments on the impact of technology, social concern, and biographical notes are included

12th EASN International Conference on "Innovation in Aviation & Space for opening New Horizons"

Epoxy resins show a combination of thermal stability, good mechanical performance, and durability, which make these materials suitable for many applications in the Aerospace industry. Different types of curing agents can be utilized for curing epoxy systems. The use of aliphatic amines as curing agent is preferable over the toxic aromatic ones, though their incorporation increases the flammability of the resin. Recently, we have developed different hybrid strategies, where the sol-gel technique has been exploited in combination with two DOPO-based flame retardants and other synergists or the use of humic acid and ammonium polyphosphate to achieve non-dripping V-0 classification in UL 94 vertical flame spread tests, with low phosphorous loadings (e.g., 1-2 wt%). These strategies improved the flame retardancy of the epoxy matrix, without any detrimental impact on the mechanical and thermal properties of the composites. Finally, the formation of a hybrid silica-epoxy network accounted for the establishment of tailored interphases, due to a better dispersion of more polar additives in the hydrophobic resin