Submersibles are a large and nonhomogeneous group of vehicles that range from small unmanned autonomous vehicles such as Gavia and REMUS that can be carried by one or two men, to medium-large unmanned submersibles such as torpedoes, survey vehicles such as HUGIN and Blueﬁn, larger manned deep-diving vehicles such as the US Alvin and the Russian MIR up to naval diesel-electric submarines. With a few exceptions, all these use electrochemical power sources for propulsion.
Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học quốc tế cung cấp cho các bạn kiến thức về ngành y đề tài: Submersion, accidental hypothermia and cardiac arrest, mechanical chest compressions as a bridge to final treatment: a case report
Các tàu ngầm là các tàu mà có thể vận
hành cả bên dưới và trên mặt nước. Một
trong các tàu có thể lặn (Nd: submersible
vessels) đầu tiên đã được đóng vào
khoảng năm 1620 bởi một người Hà Lan
có tên là Cornelius van Drebbel.
In the early years of oil drilling and production, wells were primarily drilled on land to moder-
ate depths and with relatively minor horizontal offsets, and an empirical understanding of the
impact of geological forces and Earth material properties on required drilling practice was de-
veloped by region. Successful practices were defined by trial and (sometimes costly and
Classical differential geometry is the approach to geometry that takes full
advantage of the introduction of numerical coordinates into a geometric
space. This use of coordinates in geometry was the essential insight of Rene
Descartes that allowed the invention of analytic geometry and paved the way
for modern differential geometry. The basic object in differential geometry
(and differential topology) is the smooth manifold. This is a topological
space on which a sufficiently nice family of coordinate systems or "charts"