منابع مشابه
New azidotetrazoles: structurally interesting and extremely sensitive.
The treatment of triaminoguanidinium chloride with two equivalents of sodium nitrite under acidic conditions, followed by the cyclization with stoichiometric amounts of either sodium hydroxide solution or solid sodium carbonate yielded 1-amino-5-azidotetrazole (1), 5-azido-1-diazidocarbamoyltetrazole (2), and 1-(aminoazidocarbamoyl)-5-azidotetrazole (3). The three novel compounds could be isola...
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The European Patent Organization not being a EU member state is not subject to this formal requirement of implementing the Directive. It is, however, highly desirable to have a common standard throughout Europe regarding the patenting of biotechnological inventions. The European Patent Organization recently decided to implement the rules of the Directive into the Implementing Regulations to the...
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This paper outlines a new model for understanding biological invention, based upon an extensive study of human inventiveness originating in Russia shortly after the Second World War. This science, known as the Theory of Inventive Problem Solving and referred to by the Russian acronym TRIZ, relies upon the study of human patents to reveal general principles of invention. TRIZ recognizes two dist...
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The standard algorithm for generating a random permutation gives rise to an obvious permutation statistic DIS that is readily seen to be Mahonian. We give evidence showing that it is not equal to any previously published statistic. Nor does its joint distribution with the standard Eulerian statistics des and exc appear to coincide with any known Euler-Mahonian pair. A general construction of Sk...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1916
ISSN: 0036-8733
DOI: 10.1038/scientificamerican09301916-306