@article{oai:nipr.repo.nii.ac.jp:00001674,
 author = {Yamashita, Akira and Asano, Asaharu and Ohno, Takayuki and Wada, Makoto},
 journal = {Memoirs of National Institute of Polar Research. Special issue},
 month = {Dec},
 note = {P(論文), By analyzing photomicrographs, the nature of ice crystals grown at temperatures lower than -15℃ was studied first. It was found that in the initial stage of growth, the frequency of occurrence of single-crystalline ice decreases as the temperature decreases although the type of nuclei and method of seedings affects it considerably, and that at temperatures below about -17℃, the lower the temperature the greater the growth rate of polycrystalline ice as compared to that of single-crystalline ice. Second, large ice crystals were grown in an unforced air flow cloud chamber and the nature of polycrystalline ice growing at temperatures lower than about -20℃ was investigated with the following findings : the most prominent polycrystals are those with a sharp growing tip and having a few or many side branches; the most abundant polycrystals are those having a smaller growth rate than the former and being composed of a single or several radially grown branches of assemblages of plates, columns or irregular crystals; radially grown polycrystals are very fragile.},
 pages = {96--103},
 title = {Ice cyrstals grown from the vapor at temperatures lower than -15゜C},
 volume = {34},
 year = {1984}
}