نتایج جستجو برای: 1632
تعداد نتایج: 502 فیلتر نتایج به سال:
OBJECTIVES To determine whether genetic polymorphisms in or near the transforming growth factor beta1 (TGFB1) locus were associated with susceptibility to or severity of ankylosing spondylitis (AS). METHODS Five intragenic single-nucleotide polymorphisms (SNP) and three microsatellite markers flanking the TGFB1 locus were genotyped. Seven hundred and sixty-two individuals from 184 multiplex f...
We present high-resolution spectroscopy of two nearby white dwarfs with inconsistent spectroscopic and parallax distances. The first one, PG 1632+177, is a 13th magnitude dwarf only 25.6 pc away. Previous observations failed to detect any radial velocity changes in this star. Here, we show that 1632+177 2.05 d period double-lined binary (SB2) containing low-mass He-core more-massive, likely CO-...
Although the use of ‘magnifying glasses’ was recorded in the first century AD by Pliny the elder, the forerunner of the modern microscope was only developed in 1590 when a pair of Dutch spectacle makers, Zaccharias Jannsen and his son, discovered that pairing lenses allowed objects to be magnified. Galileo, on hearing of this discovery, experimented and outlined the science of lenses and produc...
We report on the first realization of an ultrafast Airy beam optical parametric oscillator (OPO). By introducing intracavity cubic phase modulation to the resonant Gaussian signal in a synchronously-pumped singly-resonant OPO cavity and its subsequent Fourier transformation, we have generated 2-dimensional Airy beam in the output signal across a 250 nm tuning range in the near-infrared. The gen...
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