Established in , PNGV is a research and development initiative involving seven Federal agencies and the three US automobile manufacturers to strengthen US competitiveness. By , develop and validate fuel cell power system technologies that meet vehicle requirements in terms of: cost--competitive with internal combustion engines; and performance, range, safety and reliability.
Tufaile, Alberto; Sartorelli, José Carlos An anti-bubble is a striking kind of bubble in liquid that seemingly does not comply the buoyancy, and after few minutes it disappears suddenly inside the liquid. Different from a simple air bubble that rises directly to the liquid surface, an anti-bubble wanders around in the fluid due to its slightly lesser density than the surrounding liquid.
In spite of this odd behavior, an anti-bubble can be understood as the opposite of a conventional soap bubble in air, which is a shell of liquid surrounding air, and an anti-bubble is a shell of air surrounding a drop of the liquid inside the liquid. Two-phase flow has been a subject of interest due to its relevance to process equipment for contacting gases and liquids applied in industry.
A chain of bubbles rising in a liquid formed from a nozzle is a two-phase flow, and there are certain conditions in which spherical air shells, called anti-bubbles, are produced. The purpose of this work is mainly to note the existence of anti-bubbling regime as a sequel of a bubbling system. We initially have presented the experimental apparatus.
After this we have described the evolution of the bubbling regimes, and emulated the effect of bubbling coalescence with simple maps. Then is shown the inverted slimming klubid dover as a consequence of the bubble coalescence, and finally the conditions for anti-bubble formation.
Теперь Николь тщательно осмотрела убитую мать. Две раны в животе и правом бедре свидетельствовали, что два больших осколка заставили женщину насмерть истечь кровью. Осматривая рану на бедре, Николь ощутила странную опухоль на правой ягодице женщины. Полюбопытствовав, оторвала тело от земли и провела пальцами по опухоли; похоже было, что под кожей имплантирован какой-то твердый объект. Николь извлекла свою медицинскую сумку и небольшими ножницами сделала надрез с одного края опухоли.