Infrared emissions from spherical dust, clouds are calculated using quasi-diffusion method. We have employed graphite-silicate mixture with power-law size distribution for the dust model. The grains are assumed to be heated and cooled by radiative processes only. The primary heating source is diffuse interstellar radiation field. hut the cases with an embedded source are also considered. Since graphite grains have higher temperature than silicate grains, the observed IR emission is mainly due to graphite grains, unless the fraction of graphite grains is negligibly small. The color temperature of Bok globules obtained from IRAS 60 and 100 μ m data are found to be consistent with the dust cloud with graphite-silicate mixture exposed to average interstellar radiation field. The color temperature is sensitive to the external radiation field, but rather insensitive to the size distribution of the grains. We found that the density distribution can be recovered outside the beam size using the inversion technique that assumes negligible optical depth. However, the information within the beam size is lost for if beam convolved intensity distributions are used in deriving density profile.
한국산 여치과는 현재까지 32종으로 알려져 왔으나 그들 상당수의 종이 이중으로 기록되어 왔거나 유효하지 않은 혁명을 사용해옴으로써 학명사용상 혼동이 야기되어 왔었다. 이에 저자는 그들의 초기록들을 조사함으로써 이들 학명들을 재정리하여 총 26종으로 재분류하였으며, Metrioptera koreana Mori, Paratlanticus palgongensis Rentz et Miller, 그리고 Tettigonia dolicoptera mori등 3종은 새로운 synonym으로 정리하였다.
제 2 계 2 차모벤 프 밴언 점자합 포불체 근 사법의 역파정의 연산을 구하여 신뢰성설계에 적 용할 수 있 도
록 하였으며 , 파괴 점을 二,'-하기 위한 신뢰성조낀 1선의 연산과정 을 수정하여 한계상태함수가 비선형인 경우
에도 문- 제마다 식 을 새로 수립하는 번 거로웅을 피하도록 하였다.
SOSM j RC 조합방법을 이용하면 견 파적인 파괴확률은 목표파괴확률 에 부합하며 넓은 범위의 하중비
에 대해 시 의 일정 한 부분안 전 계수릎 얻 올 수 있다.
Although Serkowski used a single value K=1.15 in representing all the observed interstellar linear polarization curves by his empirical relation p ( λ ) / P m a x =exp (-K 1 n 2 ( λ m a x / λ ) ), where p m a x is the maximum polarization at wavelength λ m a x , we have noticed a meaningful variation in K from observations of 72 stars. By comparing K's with P m a x / E B − V a n d w i t h λ m a x , we have examined how the shape of the polarization curve is related with the degree of grain alignment on one hand, and with grain sizes on the other. We have shown that correlations between K, P m a x / E B − V a n d w i t h λ m a x , are consistent with the idea of Davis-Greenstein mechanism for grain alignment.