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Latest move by world’s biggest money manager to build ties and win mandates in Middle East

Mike Henry has positioned world’s largest miner for a big deal and was prepared for initial rejection by UK-listed target

Hard-right congresswoman pushes for his removal after he secured more US aid for Ukraine

Washington takes similar line to Russia and China as UN talks head towards conclusion without a deal

Israeli PM faces pressure from far-right coalition partners to proceed with assault on southern Gazan city

Environmental claims come under scrutiny, including the benefits of offsetting emissions from flying

McDonald’s and Coca-Cola among companies highlighting impact of persistent inflation

Former US president fined $9,000 for statements violating gag order and judge warns of potential jail time

Title: Computational Analysis and Regression Laws for Nozzle Erosion Prediction in Hybrid RocketsAuthors: Rotondi, Marco; Migliorino, Mario Tindaro; Bianchi, Daniele; Kamps, Landon; Nagata, HarunoriAbstract: The erosion of the nozzle throat can represent one of the major limitations against the future widespread use of hybrid rocket engines (HREs) in the space industry. In fact, nozzle erosion in HREs can be more severe and harder to predict than in solid rockets due to the higher concentration of oxidizing species in the combustion products and to mixture ratio shifts and/or throttling. Therefore, an accurate understanding of the erosion phenomenon is of fundamental importance for the technological advancement of HREs. This work is focused on the investigation of graphite nozzle erosion in HREs burning high-density polyethylene with two different oxidizers, oxygen and nitrous oxide. First, the results of a computational fluid dynamics parametric analysis are used to derive closed-form ...

2024年5月の特集「グリーン・ツーリズム」を掲載しました。