نتایج جستجو برای: normalization constant
تعداد نتایج: 243334 فیلتر نتایج به سال:
Preclinical PET studies of β-amyloid (Aβ) accumulation are of growing importance, but comparisons between research sites require standardized and optimized methods for quantitation. Therefore, we aimed to evaluate systematically the (1) impact of an automated algorithm for spatial brain normalization, and (2) intensity scaling methods of different reference regions for Aβ-PET in a large dataset...
this paper highlights the effect of silt content on cone tip resistance in loose silty sand. in this study, twenty-seven cone penetration tests are performed in saturated silty sand samples with several different silt contents ranging from 10 to 50 percent. the samples are consolidated at three overburden stresses including 100, 200 and 300 kpa. it is shown that, as the silt content increases, ...
BACKGROUND Data from 16S ribosomal RNA (rRNA) amplicon sequencing present challenges to ecological and statistical interpretation. In particular, library sizes often vary over several ranges of magnitude, and the data contains many zeros. Although we are typically interested in comparing relative abundance of taxa in the ecosystem of two or more groups, we can only measure the taxon relative ab...
We study the quantum deformation of the Barrett-Crane Lorentzian spin foam model which is conjectured to be the discretization of Lorentzian Plebanski model with positive cosmological constant and includes therefore as a particular sector quantum gravity in de-Sitter space. This spin foam model is constructed using harmonic analysis on the quantum Lorentz group. The evaluation of simple spin ne...
We propose a new methodology for direct evaluation of the degree fibrillation fibrillating pulp suspensions through pixel-resolved retardation distribution. Through simple normalization by just injecting suspension with certain concentration into quartz flow channel constant cross-sectional shape, (i.e., bundling cellulose molecular chains) can be directly mapped gradation, reflecting locally h...
The article examines the evolution of Vietnam–China relations in post-Cold War to identify factors that shapes its dynamics. It finds bilateral have been significantly changed overtime, from strategic antagonism ideology-shared partnership and subsequently economic sistership security rivalry. two countries’ worldviews gradually diverged. Given geographical nearness is a constant, such course d...
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