We demonstrate a dual-wavelength passively mode-locked soliton fiber laser based on the single-wall carbon nanotube saturable absorber. By using a simple scheme of adjusting the intracavity loss, the gain profile of the erbium-doped fiber laser is effectively controlled. Besides operating at a single wavelength, the laser is able to simultaneously generate sub-picosecond pulses at both ~1532 and 1557 nm wavelength. The mode-locking wavelength can also be quickly switched from one wavelength to the other by changing the intracavity loss with a tunable attenuator.

A blue light emitting 1,6-bis(2-hydroxyphenyl)pyridine boron complex has been synthesized and used as an emitting material to fabricate electroluminescent devices.The electroluminescence (EL) of Alq 3 (q = 8-hydroxyquinolinate) and its derivatives and also of other metal chelate complexes 1-14 have attracted a great deal of attention since the first light-emitting devices (LEDs) fabricated from Alq 3 were reported by Tang and VanSlyke. 1 This report describes the synthesis and EL properties of a 1,6-bis(2-hydroxyphenyl)pyridine boron complex.The pyridine-phenol ligand dppy and its boron complex were prepared following the synthetic route shown in Scheme 1. † The dppy ligand was obtained by the reaction of 2-bromopyridine with the Grignard reagent from 2-bromoanisole in THF with [NiCl 2 (dppe)] as catalyst at room temperature, followed by demethylation in molten pyridinium chloride. 15 The reaction of dppy with 1 equivalent of BF 3 in benzene at 60 °C resulted in the formation of (dppy)BF. An X-ray diffraction study shows that in the solid state (dppy)BF molecules exhibit intermolecular p…p interactions, ‡ leading to columnar aromatic stacks as shown in Fig. 1. The average intermolecular p…p interaction distance is 3.28 Å. Our earlier report demonstrated that the higher electron mobility of tris(8-hydroxyquinolinato)-

No abstract

No abstract

• Anaemic young adults with ESRD may afford higher CBF and OEF. • Anaemic young adults with ESRD maintain a normal CMRO 2 . • Cognitive function was still impaired in young ESRD adults. • The severity of cognitive dysfunction correlated with CBF and OEF changes.