Study of the Simultaneous Generation of UWB Doublet and Triplet Signals Based on Nonlinear Effects of SOA

A scheme that can be used to generate UWB doublet and triplet signals simultaneously based on SOA-SGS and SOA-XGM is carried up, then the theory is analyzed. Simulated through Optisystem9.0, a UWB doublet signal whose central frequency is 6GHz and relative bandwidth is 143% and a triplet signal whose central frequency is 8GHz and relative bandwidth is 120% are generated. Then, the impacts that input pulse width and light source power impose on the results is analyzed.

Mechanisms of Ascorbyl Radical Formation in Human Platelet-Rich Plasma

Recently, many clinical reports have suggested that the ascorbyl free radical (Asc∙) can be treated as a noninvasive, reliable, real-time marker of oxidative stress, but its generation mechanisms in human blood have rarely been discussed. In this study, we used upstream substances, enzyme inhibitors, and free radical scavengers to delineate the mechanisms ofAsc∙formation in human platelet-rich plasma (PRP). Our results show that the doublet signal was detected in PRP samples by using electron spin resonance, and the hyperfine splitting of the doublet signal wasaH=1.88gauss andg-factor = 2.00627, which was determined to be theAsc∙. We observed that the inhibitors of NADPH oxidase (NOX), cyclooxygenase (COX), lipoxygenase (LOX), cytochrome P450 (CYP450), mitochondria complex III, and nitric oxide synthase (NOS), but not xanthine oxidase, diminished the intensity of theAsc∙signal dose dependently. All enzyme inhibitors showed no obvious antioxidant activity during a Fenton reaction assay. In summary, the obtained data suggest thatAsc∙formation is associated with NOX, COX, LOX, CYP450, eNOS, and mitochondria in human PRP.

Temperature Dependence of a Hydrogen Doublet Site in Light-Soaked a-Si:H From 1H NMR

We investigate the temperature dependence of an additional 1H NMR signal that appears in aSi:H at T = 7 K only after light soaking. This “doublet” signal is attributed to a pair of hydrogen atoms approximately 2.3 Å apart. We present the first lineshape of this doublet, and we examine the spin-lattice relaxation from 6.5 K to 20 K at a magnetic field of about 3.5 T. At low temperatures, the spin-lattice relaxation time of these paired hydrogen sites has a strong dependence on temperature, which is probably the result of some form of local motion.