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Другие общетехнические дисциплины
Наименование:

Simulations using the fuels hydrogen and methane with detailed reaction mechanisms in the gas-phase and on the surface Numerical Modeling of Wall Effects in Lean Combustion.

Формат:      Страниц 68
     мягкая обложка
Автор:
Johan A.    
Издательство:
Книга по Требованию    
Год:2009
Цена:
2008 руб
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I the near wall boundary layer, transport of momentum, heat and mass are done in a manner that may affect the hundreds of elementary chemical reaction steps. The results presented in this work may be used by designers of combustors and microchannel reactors,where calculations cannot give accurate results unless the effects of the walls are accounted for. The wall effects must be analyzed with respect to the complicated nature of the combustion process. The simulations have been performed with the program CRESLAF, a part of the CHEMKIN software. In this work numerical simulations have been conducted to study different aspects of wall effects in the combustion of lean, premixed, hydrogen and methane fuel/air mixtures. In addition, the wall may be chemically active and lead to termination of radical chains, or through catalytic reactions that may emit products from the wall and retard the homogeneous reactions. Better understanding of combustion near walls has a significant interest in lean combustion using large excess of air, for example in the internal combustion engine concept Homogeneous Charge Combustion Ignition (HCCI).
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Система HLA и инфекционные заболевания
Антигены I класса, впервые найденные на лейкоцитах (отсюда термин HLA), экспрессируются (синтезируются и выводятся на клеточную поверхность) почти во всех тканях (продукт четвертого локуса I класса, HLA-G, экспрессируется только в трофобласте). Молекулы I класса играют важную роль при распознавании антигена цитотоксическими -клетками (CD8). Молекулы II класса кодируются тремя или более генными локусами (DR, DP и DQ). HLA-DR антигены известны также как Ia антигены по аналогии с антигенами иммунного ответа у мышей. В последнее время особое внимание исследователей привлекает область HLA-D, так как, по-видимому, именно эта область включает гены иммунного ответа человека (IR - гены), и, возможно, супрессивный ген (IS- ген). В 6 хромосоме между генами I и II классов находятся гены, кодирующие молекулы III класса (которые включают факторы комплемента 2, 4a и 4b) и цитокины F Reily R.J., Pollac M.S. e al. Use of HLA ge o ipicaly differe do ors i bo e marrow ra spla a io - ra spla . Proc., 1979, vol. 11, №1, p.219-224 8.Тананов А.Т. HLA и болезни крови.


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