نتایج جستجو برای: s17
تعداد نتایج: 347 فیلتر نتایج به سال:
Did segmented body plans evolve just once, or repeatedly among the animals? This question has become all the more controversial, now that molecular phylogenetic trees make it clear that the three major clades of segmented animals, vertebrates, annelids and the pan-arthropoda, each lies within a different major clade of the animals. If we are to have any hope of understanding the origins of segm...
As part of our program to test the Standard Model via the unitarity of the Cabibbo-KobayashiMaskawa (CKM) matrix [1] we have measured the half-lives of Ar and Cl with the principal aim of extracting a precise ft value (±0.1% or better) for the superallowed 0 → 0 β branch of Ar. The ft value is determined from three experimental quantities: the half-life, branching ratio and QEC value. For the e...
Bound states of heavy quarks (charmonium and bottomonium) provide a rich laboratory for spectroscopy in QCD [1]. Potential models have been widely and successfully applied to charmonium and bottomonium spectra in vacuum, and the validity of the approach has received further support from lattice QCD (lQCD). It is therefore promising to extend the potential approach to finite temperatures, T. Med...
Did segmented body plans evolve just once, or repeatedly among the animals? This question has become all the more controversial, now that molecular phylogenetic trees make it clear that the three major clades of segmented animals, vertebrates, annelids and the pan-arthropoda, each lies within a different major clade of the animals. If we are to have any hope of understanding the origins of segm...
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