منابع مشابه
Encoding Fullerenes and Geodesic Domes
Coxeter’s classification of the highly symmetric geodesic domes (and, by duality, the highly symmetric fullerenes) is extended to a classification scheme for all geodesic domes and fullerenes. Each geodesic dome is characterized by its signature: a plane graph on twelve vertices with labeled angles and edges. In the case of the Coxeter geodesic domes, the plane graph is the icosahedron, all ang...
متن کاملIcosadeltahedral geometry of fullerenes, viruses and geodesic domes
I discuss the symmetry of fullerenes, viruses and geodesic domes within a unified framework of icosadeltahedral representation of these objects. The icosadeltahedral symmetry is explained in details by examination of all of these structures. Using Euler’s theorem on polyhedra, it is shown how to calculate the number of vertices, edges, and faces in domes, and number of atoms, bonds and pentagon...
متن کاملEvaluation of one third of distal radius bone density in patients with primary osteoporosis
Background: Osteoporosis is the most common metabolic disease of the bone in the world, and has hit about 200 million people around the world and it increases the risk of fractures. More than 5 million osteoporotic fractures occur annually in the world. Bone mineral density is the standard method of diagnosis of this disease. In this method, proximal of femur (neck) and lumbar vertebra bones (L...
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Introduction IT is now widely accepted that congenital syphilis is an infection that is acquired in utero from the mother, usually in the later months of pregnancy. It is not perhaps so widely recognized that in the case of twin pregnancies it is not unusual for the twins to suffer the luetic infection unequally. One twin may be born healthy, the other diseased; or if both are diseased the symp...
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ROBERTS, B., SCHNABEL, T.G. & RAVDIN, I.S. (1954) Multiple episodes of cardiac arrest. Report of a case. J. Amer. med. Ass. 154, 581. SANSON, J., SLODKI, S. & GRUHN, J.G. (1963) Myocardial abscesses. Amer. Heart J. 66, 301. SCHERF, D. & BORNEMANN, C. (1960) Thumping of the precordium in ventricular standstill. Amer. J. Cardiol. 5, 30. SCHOTT, E. (1920) Ueber Ventrikellstillstand (AdamsStokes'sc...
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ژورنال
عنوان ژورنال: Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture
سال: 2019
ISSN: 2310-0044,1607-1859
DOI: 10.31675/1607-1859-2018-20-6-98-106