Decaying Modes of Propagation of Detonation and Flame Front in Narrow Channel

2019 ◽  
pp. 131-137
Author(s):  
S. V. Golovastov ◽  
G. Yu. Bivol
Keyword(s):  
Flame Front ◽  
Narrow Channel

Mechanism of detonation formation as a result of free flame propagation in unconfined space

2019 ◽  
Vol 489 (5) ◽  
pp. 461-464
Author(s):  
A. D. Kiverin ◽  
I. S. Yakovenko ◽  
V. E. Fortov
Keyword(s):  
Shock Waves ◽  
Flame Front ◽  
Flame Propagation ◽  
Linear Stage ◽  
Local Formation ◽  
Stage Of Development ◽  
Detonation Transition

The problem of the detonation formation as a result of unconfined flame propagation is solved numerically. The mechanism of detonation formation is distinguished. It is related to the local formation of shock waves du- ring the linear stage of development of flame front perturbations formed on the surface of the expanding flame front. General criteria of the establishment of the conditions for the detonation transition via the proposed mechanism are formulated.

Patent Foramen Ovale, the Role of Antiplatelet Therapy Alone or Anticoagulant Therapy Alone Versus Device Closure for Cryptogenic Stroke: A Review of the Literature and Current Recommendations

2020 ◽  
Vol 18 (2) ◽  
pp. 135-150
Author(s):  
Harsha S. Nagarajarao ◽  
Chandra P. Ojha ◽  
Archana Kedar ◽  
Debabrata Mukherjee
Keyword(s):  
Patent Foramen Ovale ◽  
Cryptogenic Stroke ◽  
Narrow Channel ◽  
Paradoxical Embolism ◽  
Current Evidence ◽  
Foramen Ovale ◽  
The Right ◽  
The Relationship ◽  
Current Guidelines

: Cryptogenic stroke and its relation to the Patent Foramen Ovale (PFO) is a long-debated topic. Recent clinical trials have unequivocally established the relationship between cryptogenic strokes and paradoxical embolism across the PFO. This slit-like communication exists in everyone before birth, but most often closes shortly after birth. PFO may persist as a narrow channel of communication between the right and left atria in approximately 25-27% of adults. : In this review, we examine the clinical relevance of the PFO with analysis of the latest trials evaluating catheter-based closure of PFO’s for cryptogenic stroke. We also review the current evidence examining the use of antiplatelet medications versus anticoagulants for stroke prevention in those patients with PFO who do not qualify for closure per current guidelines.

Structure study of the chalcogens and chalcogenides by X-ray absorption fine structure

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hiroyuki Ikemoto ◽  
Takafumi Miyanaga
Keyword(s):  
Fine Structure ◽  
Covalent Bond ◽  
Narrow Channel ◽  
Structure Study ◽  
Chain Structure ◽  
Covalent Bonds ◽  
X Ray ◽  
Absorption Fine ◽  
Amorphous States ◽  
X Ray Absorption

AbstractIn this review, we make a survey of the structure studies for the chalcogen elements and several chalcogenides in liquid, amorphous and nanosized state by using X-ray absorption fine structure (XAFS). The chalcogen elements have hierarchic structures; the chain structure constructed with the strong covalent bond as a primary structure, and the weaker interaction between chains as a secondary one. Existence of these two kinds of interactions induces exotic behaviors in the liquid, amorphous and nanosized state of the chalcogen and chalcogenides. XAFS is a powerful structure analysis technique for multi-element systems and the disordered materials, so it is suitable for the study of such as liquid, amorphous and nanosized mixtures. In section 2, the structures for the liquid state are discussed, which show the interesting semiconductor-metal transition depending on their temperatures and components. In section 3, the structure for the amorphous states are discussed. Especially, some of chalcogens and chalcogenides present the photostructural change, which is important industrial application. In section 4, the structures of nanosized state, nanoparticles and isolated chain confined into the narrow channel, are discussed. The studies of the nanoparticle and the isolated chain reveal the alternative role between the intrachain covalent bonds and the interchain interaction.

Shifting of the flame front in a small-scale commercial downdraft gasifier by water injection and exhaust gas recirculation

Fuel ◽  
2021 ◽  
Vol 303 ◽  
pp. 121297
Author(s):  
A. Zachl ◽  
M. Buchmayr ◽  
J. Gruber ◽  
A. Anca-Couce ◽  
R. Scharler ◽  
...  
Keyword(s):  
Flame Front ◽  
Water Injection ◽  
Exhaust Gas Recirculation ◽  
Small Scale ◽  
Exhaust Gas ◽  
Downdraft Gasifier ◽  
Gas Recirculation

scholarly journals Combustion and Flame Front Morphology Characterization of H2–CO Syngas Blends in Constant Volume Combustion Bombs

2021 ◽  
Vol 35 (4) ◽  
pp. 3497-3511
Author(s):  
M. Reyes ◽  
F.V. Tinaut ◽  
B. Giménez ◽  
A. Camaño
Keyword(s):  
Flame Front ◽  
Constant Volume ◽  
Constant Volume Combustion ◽  
Morphology Characterization

Conductivity properties of narrow-channel polysilicon thin-film transistors

1989 ◽  
Vol 36 (11) ◽  
pp. 2622-2623 ◽  
Author(s):  
N. Yamauchi ◽  
J.-J.J. Hajjar ◽  
R. Reif ◽  
K. Nakazawa ◽  
K. Tanaka
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Narrow Channel
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