We have fabricated optical switches using Si waveguides and phase-change material. The switch is based on an asymmetric Mach-Zehnder interferometer, and thin film Ge2Sb2Te5 is deposited onto the Si waveguides. We observe the change in transmission spectra of the switch by laser pulse irradiations repeatedly. The phase change of the Ge2Sb2Te5 film with only 1-μm-square is sufficient for π-phase ...

Dihydropyrimidines are associated with wide range of biological activities. Keeping this in view 6-phenyl-4substituted phenyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-carboxylic acid ethyl ester were prepared under microwave irradiations. These were converted to S-alky/S-benzyl-1,4dihydropyrimidines for synthesizing biologically active molecules with improved activity. These are regarded as aza-a...

Germination of tomato seeds exposed to a single, saturating irradiation from light sources of different spectral energy distribution seems to be dependent upon the photostationary P(FR)/P(R) ratio established by the irradiation. Germination of tomato seeds exposed to prolonged irradiations from the same light sources does not seem to be controlled solely by the P(FR)/P(R) ratio induced and main...

A mild procedure for the reduction of electron-deficient alkenes and carbonyl compounds is described. UVA irradiations of substituted maleimides with dispersions of titania (Aeroxide P25) in methanol/acetonitrile (1:9) solvent under dry anoxic conditions led to hydrogenation and production of the corresponding succinimides. Aromatic and heteroaromatic aldehydes were reduced to primary alcohols ...

The aim of this work was to track and verify the delivery of respiratory-gated irradiations, performed with three versions of TrueBeam linac, using a novel phantom arrangement that combined the OCTAVIUS(®) SRS 1000 array with a moving platform. The platform was programmed to generate sinusoidal motion of the array. This motion was tracked using the real-time position management (RPM) system and...