Why isn''t wood weaker that it is? Why isn''t steel stronger? Why does glass sometimes shatter and sometimes bend like spring? Why do ships break in half? What is a liquid and is treacle one? All these are questions about The nature of materials. All of them are vital to engineers but also fascinating as scientific problems. During the 250 years up to the 1920s and 1930s they had been answered largely by seeing how materials behaved in practice. But materials continued to do things that they..
Skin lesions are responsible for the inability to work for more years than cancer, cardiovascular diseases and vascular accidents together. Therefore, the necessity of carrying..
Materials based on pi-Conjugated molecules have attracted a considerable attention as a novel class of semi-conductors and are frequently studied because of their interesting..
The New Cambridge English Course is a four-level course for learners of English. Level 2 follows on from The New Cambridge English Course Level 1 (or another beginners'' course)..
New Headway English Course takes the successful Headway series into an exciting new era. It introduces new features to challenge adult and young adult intermediate students and..
"New Headway English Course" is a development of the highly successful multi-level Headway series. The original coursebooks have been rewritten to include new features,..
"New Interchange" is the second edition of "Interchange", one of the world''s most successful English courses for adult and young adult learners at the beginning to intermediate..