نتایج جستجو برای: boring billion
تعداد نتایج: 25415 فیلتر نتایج به سال:
Ensuring the stability of shaft structure is one key technologies for application raise boring method. In process reaming through rock formations with water disintegration characteristics, impact gushing and drenching may induce partial collapse. To solve this problem, an intelligent temporary while-boring support technology proposed in paper. Firstly, main characteristics are introduced. Utili...
Boring is an operation which converts a knot or two-component link in a 3–manifold into another knot or two-component link. It generalizes rational tangle replacement and can be described as a type of 2–handle attachment. Sutured manifold theory is used to find lower bounds for the genus of knots obtained by boring split links and unknots. Bounds on the euler characteristic of essential planar ...
The slogan of WHO in 1986 is “healthy life, victory for all”. It shows more confirmation and attention to positive personal and social activities in direction of health maintenance and health promotion. But in the world that anticipating near one billion people added to young and adolescent population up to 2000 and majority of them live in undeveloped countries and don’t access to health facil...
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