Effects of transverse center-of-gravity displacement, afterbody geometry, and front-face curvature on the aerodynamic characteristics of Mercury-type models at a Mach number of 5.5

Effects of transverse barycenter displacement, conical afterbody, curved front face on mercury capsule supersonic aerodynamic characteristic

Ballisistic range measurements of the drag and static and dynamic stability of a recoverable space shuttle booster vehicle

An experimental study has been conducted to determine the aerodynamic characteristics of a proposed recoverable space shuttle booster vehicle. Tests were made at Mach numbers of 0.7, 1.5, and 3.5 of two configurations, one with tail panels deflected 90 deg and one with tail panels deflected 70 deg. Both configurations were found to be highly statically stable at all Mach numbers. The dynamic behavior was erratic; the models exhibited both neutral dynamic stability and dynamic instability, and the motions experienced during free flight at the subsonic Mach number were very irregular. The flow field over the models was characterized by an extensive separated flow region which largely encompassed the tail panels. The experimental drag and static stability were not well predicted by available theoretical estimates

Synthesis and catalytic activity of μ-​oxo ruthenium(IV) porphyrin species to promote amination reactions

This work describes the synthesis of ruthenium(IV) mu-oxo porphyrin complexes of general formula [Ru-IV(TPP)(X)](2)O which have been applied as catalysts in nitrene transfer reactions using aryl azides (ArN3) as nitrene sources. Collected data indicated that the catalytic efficiency of [Ru-IV(TPP)(OCH3)](2)O was comparable to that of Ru-II(TPP)CO because of their analogous reactivity towards aryl azides to give the same catalytically active bis-imido species Ru-VI(TPP)(ArN)(2). The reaction of [RuIV(TPP)(OCH3)](2)O with Ph3CN3 or (CH3)(3)SiN3 afforded [RuIV(TPP)(N-3)](2)O which was fully characterised, its molecular structure was also determined by single crystal X-ray analysis

Big data managing in a landslide early warning system: Experience from a ground-based interferometric radar application

A big challenge in terms or landslide risk mitigation is represented by increasing the resiliency of society exposed to the risk. Among the possible strategies with which to reach this goal, there is the implementation of early warning systems. This paper describes a procedure to improve early warning activities in areas affected by high landslide risk, such as those classified as critical infrastructures for their central role in society. This research is part of the project LEWIS (Landslides Early Warning Integrated System): An Integrated System for Landslide Monitoring, Early Warning and Risk Mitigation along Lifelines. LEWIS is composed of a susceptibility assessment methodology providing information for single points and areal monitoring systems, a data transmission network and a data collecting and processing center (DCPC), where readings from all monitoring systems and mathematical models converge and which sets the basis for warning and intervention activities. The aim of this paper is to show how logistic issues linked to advanced monitoring techniques, such as big data transfer and storing, can be dealt with compatibly with an early warning system. Therefore, we focus on the interaction between an areal monitoring tool (a ground-based interferometric radar) and the DCPC. By converting complex data into ASCII strings and through appropriate data cropping and average, and by implementing an algorithm for line-of-sight correction, we managed to reduce the data daily output without compromising the capability for performing