نتایج جستجو برای: effective atomic number
تعداد نتایج: 1838747 فیلتر نتایج به سال:
introduction: globally, the need for radiotherapy as a part of cancer management increases every year. thus, the shielding for megavoltage radiotherapy rooms is of great importance. materials and methods: in the present study, 14 types of developed high-density concrete with densities ranging from 2.45 to 5.11 were simulated by using monte carlo method. the linear attenuation coefficient and th...
Chemical hardness () and absolute electronegativity () have important applications in chemistry. Inthe conceptual Density Functional theory (DFT), these concepts has been associated with electronicenergy and the relationship with ionization energy (I) and electron affinity (A) of these concepts hasbeen given. In this study, graphical method was used in order to see the relationship with the ato...
Global statistics of liquid water content and effective number density of water clouds over ocean derived from combined CALIPSO and MODIS measurements Y. Hu, M. Vaughan, C. McClain, M. Behrenfeld, H. Maring, D. Anderson, S. Sun-Mack, D. Flittner, J. Huang, B. Wielicki, P. Minnis, C. Weimer, C. Trepte, and R. Kuehn NASA Langley Research Center, Hampton, VA, USA NASA Goddard Space Flight Center, ...
1 Projections of future climate change are increasingly based on the output of many 2 different models. Typically, the mean over all model simulations is considered as the 3 optimal prediction, with the underlying assumption that different models provide 4 statistically independent information evenly distributed around the true state. However, 5 there is reason to believe that this is not the b...
Recent research has given more importance on the optimization of the indexing structure; however there is a great need for research in the area of image representation for efficient retrieval. In this paper we present a method for reducing dimensions in multi-dimensional multimedia data while preserving similarities between different images. We propose to reduce the multi-dimensionality of the ...
Introduction: With the extensive application of radiation sources and radioactive materials in various fields, the study of attenuation and absorption of X-rays and gamma-rays in several materials has become an essential and interesting field of research. Glass materials are possible alternatives of concretes for radiation-shielding materials. Materials and Methods:...
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