K 6-Minors in Triangulations on the Nonorientable Surface of Genus 3

In this paper, we shall give a constructive characterization of triangulations on the nonorientable surface of genus 3 without K ₆-minors. Our characterization implies that every 5-connected triangulation and every 4-representative triangulation on the surface has a K ₆-minor.     

Efficient oxidation of alcohols electrochemically mediated by azabicyclo-N-oxyls

Preparation of azabicyclo-N-oxyls and the electrochemical oxidation of alcohols using them as mediators have been exploited. This oxidation was applicable to a transformation of sterically hindered secondary alcohols into the corresponding ketones in high yields.     

On the Berkovits covariant quantization of GS superstring

We study the covariant quantization of the Green–Schwarz (GS) superstrings proposed recently by Berkovits. In particular, we reformulate the Berkovits approach in a way that clarifies its relation with the GS approach and allows to derive in a straightforward way its extension to curved spacetime background. We explain the procedure working explicitly in the case of the heterotic string.     

Raman and near-IR study on proton irradiated CR-39 detector and the effect of air-leak on damage formation

Raman and near-IR spectral studies have been made on the proton irradiated CR-39 plastics with 3.4 MeV at fluences ranging from 10¹⁰ to 10¹⁴ ionscm⁻². The density of –CH₂– group began to decrease after the air leak subsequent to the irradiation. This implies an important role of the oxygen on forming the permanent damage along the latent track. Production of OH group and some types of radicals was confirmed by near-IR observations in the air.