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THE STUDY OF OB STELLAR ASSOCIATIONS WITH THE GLAZAR
TOVMASSIAN H. M.,HOVHANNESSIAN R. KH.,EPREMIAN R. A.,HUGUENIN D.,NAVARRO S. G. The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
The results of observations of a dozen OB stellar associations made with the ultraviolet space telescope Glazar is presented.
Process Optimization of Biphenile Chloromethylation
( V. V. Pak ),( R. K. Karimov ),( Kh. M. Shakhidoyatov ),( D. W. Soh ) 한국동굴학회 2006 동굴 Vol.73 No.-
Optimization of the biphenile chloromethylation process with paraphormaldegide has been done in the presence of ZnCl2 with HCI gas by the Box-Wilson method of mathematical planning of experiment. The 4,4`-(dichloromethyl)-biphenile yield dependence on the biphenile-paraphormaldegide ratio, temperature and reaction duration has been studied. A mathematical model of the process has been developed and optimal conditions for the biphenile chloromethylation procedure has been determined.
Mathematical Planning for Revealing Optimal Synthetic Conditions of Naphthalene Choromethylation
( V. V. Pak ),( R. K. Karimov ),( Kh. M. Shakhidoyatov ),( L. M. Yun ),( D. W. Soh ) 한국동굴학회 2006 동굴 Vol.71 No.-
Chloromethylnaphthalene is a valuable compound for obtaining of the plant growing stimulato-napthylacetic acid. Chloromethylation of naphthalene by paraformaldehyde in the presence of glacial acetic acid, phosphoric and hydrochloric acids at temperature 80-85C and duration -6 hours the-chloromenthylnapnaphtalene yield was 55-57%. Using Box- Wilson method for mathematical planning of experiment carried out optimization of its synthesis for purpose increasing- chloromethylnaphthalene yield. Preliminary, one - factor experiments were carried out for selecting for selecting independence main parameters influencing on the synthesis. A full factor experiment of 23 with extended matrix of planning was used for optimization. Aiming to increase the-chloromethylnaphthalene yield, the obtained mathematical model was used for program of sharp raising on the reply surface. The received optimal conditions for the- chloromethylnaphthalene synthesis were selected as following: molar ratio of naphthalene-parapfsormaldehyde of 1 : 2 temperature-105C duration of the reaction - 3 hours. The yield of - chloromethylnaphthalene under these optimal conditions was 75%.
Mathematical Planning for Revealing Optimal Synthetic Conditions of Naphthalene Chloromethylation
Pak, V.V.,Karimov, R.K.,Shakhidoyatov, Kh.M.,Yun, L.M.,Soh, D.W. The Speleological Society 2006 동굴 Vol.71 No.-
Chloromethylnaphthalene is a valuable compound for obtaining of the plant growing stimulator - -napthylacetic acid. Chloromethylation of naphthalene by paraformaldehyde in the presence of glacial acetic acid, phosphoric and hydrochloric acids at temperature 80 - 85C and duration - 6 hours the -chloromethylnaphthalene yield was 55-57%. Using Box-Wilson method for mathematical planning of experiment carried out optimization of its synthesis for purpose increasing -chloromethylnaphthalene yield. Preliminary, one - factor experiments were carried out for selecting independence main parameters influencing on the synthesis. A full factor experiment of 23 with extended matrix of planning was used for optimization. Aiming to increase the -chloromethylnaphthalene yield, the obtained mathematical model was used for program of sharp raising on the reply surface. The received optimal conditions for the -chloromethylnaphthalene synthesis were selected as following: molar ratio of naphthalene parapfsormaldehyde of 1 : 2 temperature - 105C duration of the reaction - 3 hours. The yield of -chloromethylnaphthalene under these optimal conditions was 75%.
Process Optimization of Biphenile Chloromethylation
Pak, V.V.,Karimov, R.K.,Shakhidoyatov, Kh.M.,Soh, D.W. The Speleological Society 2006 동굴 Vol.73 No.-
Optimization of the biphenile chloromethylation process with paraphormaldegide has been done in the presence of $ZnCl_2$ with HCl gas by the Box-Wilson method of mathematical planning of experiment. The 4,4'-(dichloromethyl)-biphenile yield dependence on the piphenile -paraphormaldegide ratio, temperature and reaction duration has been studied. A mathematical model of the process has been developed and optimal conditions for the biphenile chloromethylation procedure has been determined.
Studies of N-Doped p-ZnO Layers Grown on c-Sapphire by Radical Source Molecular Beam Epitaxy
S. V. Ivanov,A. El-Shaer,M. Al-Suleiman,A. Bakin,A. Waag,O. G. Lyublinskaya,N. M. Shmidt,S. B. Listoshin,R. N. Kyutt,V. V. Ratnikov,A. Ya. Terentyev,B. Ya. Ber,T. A. Komissarova,L. I. Ryabova,D. R. Kh 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We report on the fabrication of p-type ZnO:N layers using radical-source molecular beam epitaxy and post-growth annealing of the samples. Plasma-activated oxygen and nitrogen fluxes are supplied via a single plasma cell. The combination of low growth temperature (350 − 400 ℃), slightly O-rich conditions, and post-growth annealing in the range of 650 − 800 ℃ results in efficient nitrogen pdoping with Hall hole concentration 3 × 1017 cm−3. The details of the structural and the electrical characterizations of the films are discussed. We report on the fabrication of p-type ZnO:N layers using radical-source molecular beam epitaxy and post-growth annealing of the samples. Plasma-activated oxygen and nitrogen fluxes are supplied via a single plasma cell. The combination of low growth temperature (350 − 400 ℃), slightly O-rich conditions, and post-growth annealing in the range of 650 − 800 ℃ results in efficient nitrogen pdoping with Hall hole concentration 3 × 1017 cm−3. The details of the structural and the electrical characterizations of the films are discussed.