Glass is the oldest man-made material. Its invention about five thousand years ago should be considered as one of the crucial events in the history of mankind. Glass has given man the possibility to have daylight in his protected living environment and to compensate the defects of his sight. Glass containers and tableware have played and still play an important role in man's everyday life. Glass elements in microscopes and telescopes have given us the possibility to learn the secrets of micro- and macrocosm. Glass participates in the most sophisticated technologies: glass fibers have caused a revolution in telecommunication, glass is used as a material for many modern electronic devices. Although nowadays plastics often make a strong competition to glass, for many applications glass is still the best material due to its specific properties - its hardness, good transparency, resistance to chemicals, the easiness to shape glass articles, feasibility to change the composition of the glass in order to meet new specific demands, etc. Two peculiarities of glass should be pointed out. The first is the fragility of glass - it breaks easily due to tensile stresses. The second is the fact that in every glass item there exist residual stresses due to the complicated technological process during which glass from the state of a viscous liquid at high temperature turns into solid state, while cooled down.
In just over a hundred years-from the death of Muhammad in 632 to the beginning of the Abbasid Caliphate in 750-the followers of the Prophet swept across the whole of the Middle East, North Africa, and Spain. Their armies threatened states as far afield as the Franks in Western Europe and the Tang Empire in China. The conquered territory was larger than the Roman Empire at its greatest expansion, and it was claimed for the Arabs in roughly half the time. How this collection of Arabian tribes was able to engulf so many empires, states, and armies in such a short period of time is a question that has perplexed historians for centuries. Most recent popular accounts have been based almost solely on the early Muslim sources, which were composed centuries later for the purpose of demonstrating that Photoelasticity of Glass download ebook pdf God had chosen the Arabs as his vehicle for spreading Islam throughout the world. In this ground-breaking new history, distinguished Middle East expert Robert G. Hoyland assimilates not only the rich biographical and geographical information of the early Muslim sources but also the many non-Arabic sources, contemporaneous or near-contemporaneous with the conquests.
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Author: Hillar Aben,Claude Guillemet
Number of Pages: 255 pages
Published Date: 26 Nov 2012
Publisher: Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
Publication Country: Berlin, Germany
Language: English
ISBN: 9783642500732
Download Link: Click Here
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