Remarks to history of radon activity concentration metrology

The radon activity concentration – An Euromet and BIPM supplementary comparison

Some Personal Remarks on the Radon Transform

Back in 1955, I worked on extending the mean value theorem of Leifur Ásgeirsson [1937] for the ultrahyperbolic equation on Rn ×Rn to Riemannian homogeneous spaces G/K ×G/K. I was motivated by Godement’s generalization [1952] of the mean value theorem for Laplace’s equation Lu = 0 to the system Du = 0 for all G-invariant differential operators D (annihilating the constants) on G/K. At the time (...

Outdoor radon concentration in China

The annual effective dose to Chinese population from natural radiation exposure is about 3.1 mSv/y, of which 1.56 mSv/y or 50% is due to the exposure from radon and its daughters [1]. The enhanced natural radiation level results mainly from indoor radon concentrations rising by 70%, compared to the previous data in 1990s [1, 2]. Based on the research, the increase in indoor radon concentrations...

ترجمه و تحقیق کتاب an introduction to the history of mysticism

پایان نامه ی ارائه شده ترجمه ی کتاب «an introduction to the history of mysticism» نوشته ی مارگارت اسمیت که وی پژوهشگر، خاورشناس و محقق برجسته ی تصوف و عرفان می باشد. موضوع اساسی و مهم این کتاب عرفان در ادیان مختلف است. نویسنده در ابتدا این کلمه را ریشه یابی کرده و سپس تعریفی از آن ارائه داده و آن را در ادیان مختلف مورد بحث قرار داده است و در هر فصل کتاب به معرفی عرفای آن دین یا عصر خاصی پرداخته...

Variation of radon progeny concentration over a continental location

Background: The variation of the radon progeny concentration in outdoor environment and meteorological parameters at fine resolution were studied for one year at a continental location, National Atmospheric Research Laboratory, Gadanki, India.  Materials and Methods: The concentrations were measured using Alpha Progeny Meter by collecting air samples at a height of 1 m above the Earth&rsqu...