ABDURRAHMAN B. AHMED B. ALİ El-HUMEYDÎ’DE METHİYE ÖRNEKLERİ

El B-205 En La Puc-rio

This paper presents data and documents relating to Datatron Burroughs B-205, first computer for scientifical purposes to operate in a Brazilian university, installed on the campus of the Catholic University of Rio de Janeiro (PUC-Rio) in 1960. The paper attempts to understand the academic, scientific and symbolic meanings for both history and memory of computer sciences in Brazil and in particu...

SYNTHESIS OF NOVEL HETEROCYCLIC SYSTEM 4H-IMIDAZO [ 2,l -b] PYRIDO [2,3-el [I, 3,4] THIADIGZIM

Diazotization of 3-amino-2-cMoro pyridine (3) in the presence of dithizone (5) gave dphenyl-2-phenylazo-4H-pyrid[o3 ,2-e] [1,3,4] thiadiazine (6). Reaction of 2- chloro-3-nitropyridine (2, G=H) with (5) dfordd 4-phenyl -2-phenylazo -4Hpyrido [2,3-el [1,3,4] thiadiazine (7). Reduction of the latter with H gas in the presence of Raney nickel gave the corresponding amino derivative (12). One ...

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The 1976 seminal paper of Diie and Hellman is a landmark in the history of cryptography. They introduced the fundamental concepts of a trapdoor one-way function, a public-key cryptosystem, and a digital signature scheme. Moreover, they presented a protocol, the so-called Diie-Hellman protocol, allowing two parties who share no secret information initially, to generate a mutual secret key. This ...