OSIRIS Payload for DLR's BiROS Satellite

Direct optical communication links might offer a solution for the increasing demand of transmission capacity in satellite missions. Although direct space-to-ground links suffer from limited availability due to cloud coverage, the achievable data rates can be higher by orders of magnitude compared to traditional RF communication systems. DLR’s Institute for Communication and Navigation is currently developing an experimental communication payload for DLR’s BiROS satellite. The OSIRIS payload consists of a tracking sensor for a precise alignment between satellite and groundstation, an optical uplink channel, the two different and independent laser sources and the optical bench with the transmission optics. This paper will give an overview about the BiROS satellite, the OSIRIS payload and the performance of the system, including space-qualification of the hardware and transmission tests

Repeated Load Triaxial Testing of Recycled Excavation Materials Blended with Recycled Phyllite Materials

Recycled Excavation Materials (REM) are becoming viable alternative construction resources due to their economic benefits. However, REM may be composed of weak rocks, e.g., phyllites, limiting the use in a base layer. The present paper attempts to further the knowledge of the mechanical performance of REM by performing Repeated Load Triaxial Tests (RLTT). REM are mixed with Recycled Phyllite Materials (RPM) in systematic blends of 0%, 25%, 50%, and 100%. The batches’ resilient modulus (MR) and permanent deformation (PD) characteristics were assessed to establish the maximum RPM allowed into REM while maintaining the required performance. Hicks and Monismith’s and Uzan’s models were used to characterize the stiffness behavior. A wide variation in the stiffness between the two materials was observed. Batches comprised of 0% RPM–100% REM and 25% RPM–75% REM showed high stiffness performance. The Coulomb model assessed the PD behavior, and the results showed a similar response for all batches. Unlike the stiffness, blended mixtures did not show sensitivity to increased RPM content in the PD. This study may help end-users to understand the performance of REM given the documented threshold on the allowable quantity of RPM in REM.publishedVersio

Evaluating the effect of mineralogy and mechanical stability of recycled excavation materials by Los Angeles and micro-Deval test

This paper presents the findings of the mechanical performance of recycled excavation materials (REM). The aim was to document the stable performance of REM and to suggest its suitability for unbound applications. Test operations were performed at different schedules with the Los Angeles (LA) and micro-Deval (MD) test machine. X-ray diffraction (XRD) analysis was performed to examine the effect of mineralogy on the performance of REM. The results showed that REM showed consistent LA performance, but significant variations were observed in MD values. XRD results showed that up to 20% of chlorite and mica minerals had no influence on the LA performance of REM.publishedVersio

Evaluating the effect of mineralogy and mechanical stability of recycled excavation materials by Los Angeles and micro-Deval test

publishedVersio

Туризм как ресурс формирования социального благополучия

Социально-философское осмысления взаимосвязи и взаимовлияния туризма и благополучия актуально, поскольку туризм стал сферой жизни обществ, а социальное благополучие является фундаментальным залогом развития социума, его стабильности и процветания. По мнения автора, туризм становится одной из основ социального благополучия в объективных и субъективных его проявлениях. Благополучие, как основа личностной и социальной самореализации и успешности в достижении целей, в свою очередь, позволяет формировать жизненные стратегии глобального общества.Socio-philosophical understanding of the relationship and mutual influence of tourism and well-being is important, because tourism has become a sphere of life of societies, and social well-being is a fundamental guarantee of the development of society, its stability and prosperity. According to the author, tourism becomes one of the foundations of social well-being in its objective and subjective manifestations. Well-being, as the basis of personal and social self-realization and success in achieving the goals, in turn, allows to form the life strategies of the global society