نتایج جستجو برای: rotary engine
تعداد نتایج: 81053 فیلتر نتایج به سال:
Titanium has a wide variety of applications, particularly in the aerospace industry. However, because of its low thermal conductivity and high strength, machining of titanium is very difficult. The heat generated in machining can dramatically shorten the tool life. Rotary ultrasonic machining (RUM) is a non-traditional machining process, and has been used to machine various difficult-to-machine...
AIM To compare the cleaning effectiveness and shaping ability of SafeSider, ProTaper Universal and Lightspeed rotary instruments during the preparation of curved root canals in extracted human teeth. MATERIALS AND METHODS A total of 63 roots with curved root canals were divided into three groups. Canals were prepared using SafeSider, ProTaper Universal or Lightspeed LSX. Using pre- and post-i...
Opposed rotary piston (ORP) engines have high power density and compact designs which meet the requirements of sources hybrid vehicles. Hydrogen applications to ORP can effectively decrease greenhouse gas emissions; however, hydrogen combustion in around stoichiometric ratio generated large quantities nitrogen oxides (NOx), especially for low engine speed conditions. Lean-burn as an effective m...
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