منابع مشابه
Fully Relativistic ab initio Dirac-Coulomb Calculations of Atomic Properties of Rn and Element 118
Experiments on the production of elements 112-116 in Dubna, Russia, have proven the existence of the enhanced stability of their neutron-rich isotopes. Furthermore, the existence of element 118 has been demonstrated using the Ca beam and the Cf target [1]. The produced 118 isotope has half-life Tα=0.89 +1.07 -0.31 ms in agreement with the theoretical predictions and decays into 114 or 112, whic...
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The discovery during the first half of the 20th century of the link between natural fluoride, adjusted fluoride levels in drinking water and reduced dental caries prevalence proved to be a stimulus for worldwide on-going research into the role of fluoride in improving oral health. Epidemiological studies of fluoridation programmes have confirmed their safety and their effectiveness in controlli...
متن کامل118 Youn
Ontologies play a key role in realizing the full power of etechnology. Ontologies allow for machine-understandable semantics of data, and facilitate the search, exchange, and integration of knowledge for B2B (business-to-business) and B2C (business-to-consumer) e-commerce. Ontology is defined as “the specification of shared knowledge” (Waterson & Preece, 1999). By using semantic data, the usabi...
متن کاملRadium and radon exhalation studies of soil
Background: Everyone is exposed to radon because it is present everywhere with varying concentrations. Radon and its progeny are well established as lung carcinogenic. Materials and Methods: Track etch technique using LR-115 plastic track detectors has been used to measure the effective radium content and radon exhalation rates in soil samples collected from urban area of Etah district...
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Selective functionalization reactions of aromatic and heteroaromatic halides with carbon, oxygen, and nitrogen nucleophiles have attracted much attention in the last decades. In addition to typical metal-catalyzed coupling reactions, direct functionalization of aryl halides through the formation of Grignard reagents offer new ways for the efficient construction of biologically interesting carbo...
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ژورنال
عنوان ژورنال: Journal of the Chemical Society, Chemical Communications
سال: 1975
ISSN: 0022-4936
DOI: 10.1039/c3975000760b