منابع مشابه
Deformation of grain boundaries in polar ice
– The ice microstructure (grain boundaries) is a key feature used to study ice evolution and to investigate past climatic changes. We studied a deep ice core, in Dome Concordia, Antarctica, which records past mechanical deformations. We measured a “texture tensor” which characterizes the pattern geometry and reveals local heterogeneities of deformation along the core. These results question key...
متن کاملMartian South Polar Deformation and Sublimation Processes
Introduction: The first glacial deformations of an extraterrestrial ice sheet have been discovered and documented at the Martian south polar cap in Mars Orbital Camera (MOC) images [1-4]. Within the south polar cap various structural deformational features have been found, including boudinage, folds, and faults [1-2] (Fig. 1). These features are also found in terrestrial glaciers [5-7]. Mars pr...
متن کاملDeformation-Free Single-Crystal Nanohelixes of Polar Nanowires
Ultrasmall, deformation-free, single-crystal nanohelixes/nanosprings of piezoelectric ZnO are reported. The nanohelixes are made of ∼12 nm nanowires and have a uniform mean diameter of ∼30 nm. The growth follows a hexagonal screw-coiling model, in which the growth of the nanowire is led by the Zn-terminated (0001) front surface due to self-catalysis. A sequential and periodic 60° rotation in gr...
متن کاملAnalytical Methods for Polar Pollutants
The last few decades have shown that analytical chemistry and environmental chemistry are “conjoined twins”. Neither can move significantly forward without the contribution and support of the other discipline. But in their conjoined development both disciplines have contributed much to our knowledge of environmental pollution, to the understanding of environmental processes, and to the developm...
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ژورنال
عنوان ژورنال: Annales de l’institut Fourier
سال: 1992
ISSN: 0373-0956
DOI: 10.5802/aif.1308