Grain size is the diameter of individual grains of sediment, or the lithified particles in clastic rocks. The term may also be applied to other granular materials. This is different from the crystallite size, which refers to the size of a single crystal inside a particle or grain. A single grain can be composed of several crystals. Granular material can range from very small colloidal particles, through clay, silt, sand,
Grain size measurements began in 1894 with the publication by Albert Sauveur who reported the grain size in terms of the number of grains per unit area. But, Sauveur did not describe his test method. Later, his graduate student, Zay Jeffries, described the approach in detail. Jeffries was a founding member of ASTM Committee E-4 on Metallography in 1916 and he incorporated the “planimetric” grain size
11.08.2009· Recent studies show that grain size distribution of ultrafine pedogenic maghemite grains within the aeolian sequences on the central Chinese Loess Plateau deposited in the last 8 Ma is consistent. However, whether the observed grain size distribution of ultrafine pedogenic maghemite grains can be observed in the western Chinese Loess Plateau and modern soils is not entirely clear.
In some schemes "gravel" is anything larger than sand (>2.0 mm), and includes "granule", "pebble", "cobble", and "boulder" in the above table. In this scheme,
A constant grain size distribution is also found in the Red Clay, which forms under a warmer climate across CLP and contains a slightly higher content of Hm [Nie et al., 2007 [Nie et al.,,2010
Regulation of grain size is crucial for improving crop yield and is also a basic aspect in developmental biology. However, the genetic and molecular mechanisms underlying grain size control in crops remain largely unknown despite their central importance. Here, we report that the MEI2-LIKE PROTEIN4 Control of Grain Size and Weight by the GSK2-LARGE1/OML4 Pathway in Rice Plant Cell. 2020
Consistent grain size distribution of pedogenic maghemite of surface soils and Miocene loessic soils on the Chinese Loess Plateau
Englisch-Deutsch-Übersetzungen für grain size im Online-Wörterbuch dict.cc (Deutschwörterbuch).
Grain size reduction seems the most attractive physical process for explaining the initial localization of the deformation. Cataclastic fracturing and recrystallization are well known mechanisms of grain size reduction and the ductile deformation in the diffusive regime is facilitated in the presence of small grains (Kelemen & Hirth 2007). However, models of localization by grain size reduction are not self
Although grain size is one of the most important components of grain yield, little information is known about the mechanisms that determine final grain size in crops. Here we characterize rice small grain1 (smg1) mutants, which exhibit small and light grains, dense and erect panicles and comparatively slightly shorter plants. The short grain and panicle phenotypes of smg1 mutants are caused by a defect in cell
01.10.2002· It shows a grain-size distribution which is consistent with that of the saltation group in hydraulic sedimentary systems as indicated in Fig. 3, and could be generated by occasional heavy storm events. Two closely overlapping components are both coarse skewed with modal grain sizes of 8–9 and 25–35 μm, respectively. These grain sizes are quite different from the typical saltation group
planar grain size, that is, characterization of the two-dimensional grain sections revealed by the sectioning plane. Determination of spatial grain size, that is, measurement of the size of the three-dimensional grains in the specimen volume, is beyond the scope of these test methods. 1.4 These test methods describe techniques performed manually using either a standard series of graded chart images
3.2.1 ASTM grain size number—the ASTM grain size number, G, was originally deﬁned as: N AE 5 2 G21 (1) where N AE is the number of grains per square inch at 100X magniﬁcation. To obtain the number per square millimetre at 1X, multiply by 15.50. 3.2.2