منابع مشابه
Cometary glycine detected in samples returned by Stardust
available online at http://meteoritics.org Cometary glycine detected in samples returned by Stardust Jamie E. ELSILA*, Daniel P. GLAVIN, and Jason P. DWORKIN NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA *Corresponding author: [email protected] (Received 05 June 2009; revision accepted 24 July 2009) Abstract–Our previous analysis of cometary samples returned to Earth by N...
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In the near future NASA intends to explore various regions of our solar system using robotic devices such as rovers, spacecraft, airplanes, and/or balloons. Such platforms will carry imaging devices, and a variety of analytical instruments intended to evaluate the chemical and mineralogical nature of the environment(s) that they encounter. The imaging and/or spectroscopic devices will acquire t...
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BACKGROUND Traveller's diarrhoea is among the most frequently reported problems for travellers. Prevention remains a challenge in travellers and the appropriate management of traveller's diarrhoea remains paramount. OBJECTIVE This article provides an overview of the general approach to diarrhoea in the returned traveller, including identification of common causes and management. DISCUSSION ...
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Preliminary results of the analyses of five carbonaceous materials (particle size of approximately 50 μm) from the Hayabusa spacecraft sample catcher, including their texture, chemistry, and chemical/isotopic compositions, are summarized. The carbonaceous particles underwent sequential analysis using a series of microanalytical instruments located at several research institutes and universities...
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High performance concrete (HPC) requires a low water-to-cementitious materials mass ratio (w/cm), often with the inclusion of supplemental cementitious materials such as silica fume in the mixture, thus necessitating the use of a superplasticizer. Because of the low w/cm and rapid reaction at early ages, proper curing from the earliest time possible is very essential in HPC. Internal curing has...
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ژورنال
عنوان ژورنال: Space Science Reviews
سال: 2020
ISSN: 0038-6308,1572-9672
DOI: 10.1007/s11214-020-00676-9