Jun John Sakurai

The distance of Sakurai ’ s Object

Sakurai’s Object seems to be undergoing a very late Helium-flash, making it a unique observational event with very important implications for our understanding of late stellar evolution.Wepresent thefirst individual distancedetermination: using the extinction method we have derived a distance of 1.1 kpc for the planetary nebula surrounding the star. This accurate distance will be a crucial step...

Hosomi-Sakurai reactions of silacyclic allyl silanes.

Substituted silacyclohexenes, generated through silene-diene [4 + 2] cycloaddition reactions, undergo Lewis acid promoted Sakurai type reactions with acetals to afford, following oxidation of the resultant fluorosilane, 1,4-diols with four contiguous chiral centres.

غزلی بر جان کیتس(john Keats )

جان کیتس (1821-1795) یکی از مشهورترین و مبتکرترین شعرای تاریخ ادبیات انگلستان است . اولین شعری که از وی ثبت شده در تاریخ 1814سروده شده است . و عنوان آن تقلید ی از اسپنسر بوده است . در سال 1817 نخستین و در سال 1818 دومین و در سال 1820 سومین و آخرین جلد مجموعه اشعار وی منتشر شده است . کیتس با داشتن قدرت عظیم تخیل و نبوغ در نوشتن ‘ می توانست دنیای زیبای طبیعت پیرامون خود را به صورت بسیار مطبوع در...

A stellar endgame – the born - again Sakurai ’ s object

The surface chemical composition of this remarkable star shows that it is hydrogen-deficient, carbonrich and enriched in the light s-process elements. Spectra taken in May and October 1996 indicate a decrease in the surface hydrogen abundance by 0.7dex in five months along with an increase in the abundances of Li, Sr, Y and Zr. The abundance changes are in agreement with the hypothesis of the s...

GLUON CONDENSATE AND BEYOND The 1999 Sakurai Prize Lecture a