منابع مشابه
Realisation of grinding-hardening in workpieces of curved surfaces—Part 1 Plunge cylindrical grinding
This paper investigates the feasibility to achieve grinding-hardening in a plunge cylindrical grinding process. To understand the mechanisms, a temperature-dependent finite element heat transfer model incorporating a triangular moving heat source was developed to describe the temperature field, thus to predict the thickness of the grinding-hardened layer. The analysis carried out included the v...
متن کاملAn improved cryogen for plunge freezing.
The use of an alkane mixture that remains liquid at 77 K to freeze specimens has advantages over the use of a pure alkane that is solid at 77 K. It was found that a mixture of methane and ethane did not give a cooling rate adequate to produce vitreous ice, but a mixture of propane and ethane did result in vitreous ice. Furthermore, the latter mixture produced less damage to specimens mounted on...
متن کاملHow seabirds plunge-dive without injuries.
In nature, several seabirds (e.g., gannets and boobies) dive into water at up to 24 m/s as a hunting mechanism; furthermore, gannets and boobies have a slender neck, which is potentially the weakest part of the body under compression during high-speed impact. In this work, we investigate the stability of the bird's neck during plunge-diving by understanding the interaction between the fluid for...
متن کاملTaking the plunge: recreational water quality guidelines.
During the 1980s, the profile of recreational water quality at Sydney’s beaches caused concern among Sydneysiders. Monitoring of recreational water quality indicated that most Sydney beaches had poor water quality, and this condition was attributed to the disposal of partiallytreated sewage at cliff-face discharges. An epidemiological study conducted in 1989–1990 attempted to determine the prev...
متن کاملPlunge waveforms from inspiralling binary black holes.
We study the coalescence of nonspinning binary black holes from near the innermost stable circular orbit down to the final single rotating black hole. We use a technique that combines the full numerical approach to solve the Einstein equations, applied in the truly nonlinear regime, and linearized perturbation theory around the final distorted single black hole at later times. We compute the pl...
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ژورنال
عنوان ژورنال: Journal of the Japan Society for Precision Engineering
سال: 1987
ISSN: 1882-675X,0912-0289
DOI: 10.2493/jjspe.53.1453