منابع مشابه
Pumice-pumice collisions and the effect of the impact angle
[1] Using a high-speed video camera, we studied oblique collisions of lapilli-size pumice cylinders (with no rotation before impact) on flat pumice targets. Our results show that the rebound angle, the ratios of the components of velocities and the energy loss vary with the impact angle. In particular, in collisions with an average yaw angle approximately equal to zero, we observed relatively l...
متن کاملEvidence for Recent Large Magnitude Explosive Eruptions at Damavand Volcano, Iran with Implications for Volcanic Hazards
Damavand is a large dormant stratovolcano in the Alborz Mountains of northern Iran located in one of the most populous provinces, which could be adversely affected by tephra fall from Damavand. The youngest known eruption is a lava flow on the western flanks with an age of 7.3 ka. The volcanic products are predominantly porphyritic trachyandesite. Three major young pumice deposits, named here a...
متن کاملDecline and Fall of Activity with Age
Ages for the components of binary stars are calculated from measurements of their chromospheric activity using the HK spectrophotometer at Mount Wil-son Observatory. Binaries are useful for age calibration because bright open clusters spanning the entire solar Main Sequence lifetime are not readily available, and also because age determinations using moving groups are comparatively uncertain ow...
متن کاملRise and fall of the FEV(1).
BACKGROUND Most studies of the rate of decline in ventilatory capacity in normal subjects take into account a relatively restricted number of factors, such as age, smoking, and dust exposure. There is increasing evidence to suggest that such a limited approach is inadequate. OBJECTIVE To carry out a prospective study of those factors influencing the rate of decline of the ventilatory capacity...
متن کاملThe Rise and Fall of MAIT Cells with Age
To the Editor, We read with interest the article by Novak et al. recently published in the Scandinavian Journal of Immunology and write in support of their data. The authors describe the profound changes with age of peripheral circulating mucosal associated invariant T (MAIT) cells in a cohort of patients whose samples were obtained post-clinical analysis [1]. We conducted a similar study of a ...
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ژورنال
عنوان ژورنال: The Quaternary Research (Daiyonki-Kenkyu)
سال: 1994
ISSN: 1881-8129,0418-2642
DOI: 10.4116/jaqua.33.205