This paper describes the design and application of automatic plunge grinding device for M1080 centerless grinders, assuring the process accuracy of engine valve stem.

M 1080无心磨床的自动切入磨削装置的设计与应用，保证了汽车发动机气门杆部加工精度。

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By means of macroscopic analysis, chemical composition analysis and microstructure examination, the cracking reason of engine exhaust valve stem has been studied.

采用宏观断口分析、化学成分分析及金相检验等方法，对发动机排气门杆断裂原因进行了分析。

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The invention relates to a method for making a titanium-based automotive engine valves using powder metallurgy process, and the automotive engine valve stem, engine valve and method of producing both.

本发明涉及利用粉末冶金工艺制造钛基汽车发动机气门的方法。公开了汽车发动机气门杆、发动机气门以及二者的制造方法。

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They believe a single type of cell may be cancer's main growth engine:mutant stem cells that, though barely present, spawn other cells that then spark growth.

FORBES: Cancer Killer

Besides playing to the gallery of public opinion, it is hoping that, in the long term, stem-cell technology could become an important engine of growth.

ECONOMIST: Stem cell research