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바울형 미분기 덕트베인 형상 개선이 유속 분포에 미치는 영향
박덕배(Duck Bae Park),유호선(Ho-Sun Yoo),문승재(Seung-Jae Moon),이재헌(Jae-Heon Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This study analyzed the uneven abrasion of the deflector and coal spillage due to the air velocity maldistribution in the vane wheel of a bowl-type pulverizer. In addition, air flow in the underbowl of a bowl-type pulverizer was studied to check air velocity maldistribution in the vane wheel using numerical method. In an attempt to correct the maldistribution of air velocity, air flow of the modified duct vane was studied as enlarging the length of the duct vanes installed at the air inlet duct of the pulverizer and increasing the angle of inclination. It was found that modified duct vane make the velocity distribution at the vane wheel uniform. formed by the duct vanes installed at the air inlet duct of the pulverizer, swirling flow is the major factor in making the velocity distribution of vane wheel exit uniform and can prevent the
흰쥐 뇌하수체 전엽에서 에스트로겐에 의한 에스트로겐 수용체 mRNA 발현 조절
천민석,박덕배,박용빈,감경윤,김창미,유경자 대한내분비학회 1997 Endocrinology and metabolism Vol.12 No.4
The estrogen receptor(ER) is present in a wide variety of mammalian tissues and is required for the physiological responses of estrogen, including estrogen-induced tissue-specific changes in gene expression. But most of our knowledge on the regulation of ER mRNA levels comes from in vivo steroid replacement experiments or cancer cell lines that express the ER. Thus the present study was attempted to determine 1) the anterior pituitary ER mRNA levels during rat estrous cycle 2) if estradiol itself directly modulates the ER mRNA levels in cultured rat anterior pituitary using RT-PCR method. In rats with 4 day estrous cycle, the ER mRNA levels in anterior pituitary gland reached to maximum at proestrus 11:00h just before serum estradiol concentration showed the highest. From then, the ER mRNA levels gradually declined during the rest of the proestrus. On the other hands, in cultured rat anterior pituitary cells, the ER mRNA levels were significantly decreased by the treatment of estradiol. These results indicate that the surge of estradiol was proceeded by the increase in pituitary ER mRNA levels during the proestrus and in cultured anterior pituitary cells, estrogen might be involved in the down-regulation of the ER mRNA levels. (J Korean Soc Endocrinol 12:518-527, 1997)