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تسجيل مستخدم جديدWeapons Radiochemistry: Trinity and Beyond
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On July 16, 1945, the Trinity nuclear test exploded in the desert near Alamogordo, NM. A variety of new diagnostic experiments were fielded in an effort to understand the detailed performance of the nuclear device. This article describes a series of radiochemical experiments that were designed to measure the efficiency and neutron fluence of the test. These experiments, and the scientists who led them, laid the foundation of weapons radiochemistry for decades to come.
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New measurement and assessment techniques have been applied to the radiochemical re-evaluation of the Trinity Event. Thirteen trinitite samples were dissolved and analyzed using a combination of traditional decay counting methods and the mass spectro
metry techniques. The resulting data were assessed using advanced simulation tools to afford a final yield determination of $24.8 pm 2$ kilotons TNT equivalent, substantially higher than the previous DOE released value of 21 kilotons. This article is intended to complement the work of Susan Hanson and Warren Oldham, seen elsewhere in this issue.
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orana. The article he wrote was entitled The value of statistical laws in physics and social sciences. I will discuss its origin and history that has been recently discovered in the study of Stefano Roncoroni. This recent study documents the true reasons and motivations that triggered the pioneering work of Majorana. It also shows that the description of this work provided by Edoardo Amaldi was shallow and misleading. In the second part of the talk I will recollect the first years of development of econophysics and in particular the role of the International Workshop on Econophysics and Statistical Finance held in Palermo on 28-30 September 1998 and the setting in 1999 of the Observatory of Complex Systems the research group on Econophysics of Palermo University and Istituto Nazionale di Fisica della Materia.
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ew Mexico in Albuquerque, NM in 1969 is quoted. From the literature review, basic models for the Dragon experiment and for a Water Boiler type assembly (aqueous homogeneous reactor) were created that can be used for conducting multi-physics simulations for criticality excursion studies. This methodology utilizes the coupled neutronic-hydrodynamic method to perform a time-dependent dynamic simulation of a criticality excursion. MCNP was utilized to calculate important nuclear kinetic parameters that were incorporated into the models. Simulation results compared reasonably well with historic data.
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ors, creating supply chains to provide uranium oxide, heavy water and polonium to the Manhattan Project, and the direct contributions of several Canadians living the United States. These wartime efforts helped establish a legacy of nuclear research in Canada which has persisted to the present day.
Song and dance are a traditional means of strengthening culture and passing knowledge to successive generations in the Torres Strait of northeastern Australia. Dances incorporate a range of apparatuses to enhance the performance, such as dance machin
es (Zamiyakal) and headdresses (Dhari). The dances, songs, headdresses and dance machines work together to transfer important knowledge about subsistence survival, social structure, and cultural continuity. This paper explores how celestial phenomena inspire and inform music and dance.
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