منابع مشابه
Young Stars and Molecular Clouds in the IC 2944/2948 Complex
One of the fine clusters of the southern sky is found within the extended HII region IC 2944/2948. The cluster, which appears to be only a few million years old, contains a dozen O stars, many of which are binaries, and is surrounded by a shell of remnant molecular clouds containing embedded IRAS sources. At a distance of about 2 kpc, only a few of the faint cluster members have been identified...
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We discuss the observational characteristics of a recently proposed class of variable central stars of planetary nebulae. We summarize previous observations of the nucleus of IC 418, a prototype star of this class, and we analyze new photometry of this object, obtained in 1989 and 1991. We confirm that the characteristic timescale of the photometric variations is a fewhours.No single period can...
متن کاملC4an02357a 2944..2956 ++
By looking back on the history of Raman Optical Activity (ROA), the present article shows that the success of this analytical technique was for a long time hindered, paradoxically, by the deep level of detail and wealth of structural information it can provide. Basic principles of the underlying theory are discussed, to illustrate the technique’s sensitivity due to its physical origins in the d...
متن کاملinvestigation of thermal comfort properties of woven sport fabric using blend of estabragh fibers
امروزه لباس در نظر ورزشکاران و کسانی که برای اوقات فراغت خود و یا برای رسیدن به اندامی متعادل، ورزش می کنند؛ بسیار با اهمیت است. احساس مطلوب از لباس در زمره خصوصیات راحتی پوشش می باشد. خصوصیات انتقال رطوبت لباس، در ارزیابی راحتی حسی و حرارتی منسوجات تولید شده از آن ها بسیار مهم است. هدف از این تحقیق، معرفی پارچه جدید است که متشکل از الیاف استبرق با خواص منحصر به فرد می باشد. استبرق لیف طبیعی تو...
investigation of (meta)discourse markers in elt coursebooks
the present study aimed to investigate representation of discourse markers and metadiscourse markers in conversations and readings of general elt coursebook series used in the language centers of iran. to this aim, four elt coursebooks popularly taught in language centers of this country were analyzed based on fung and carter’s (2007) framework regarding discourse markers and hyland’s (2005) fr...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1973
ISSN: 0074-1809
DOI: 10.1017/s0074180900098995