Tribocharging of Particle Contaminants Evaluated as an Ignition Source in Oxygen-Enriched Environments

2010 ◽  
pp. 389-389-40 ◽  
Author(s):  
Aditi Oza ◽  
Sudipto Ghosh ◽  
Kanchan Chowdhury
Keyword(s):  
Ignition Source ◽  
Enriched Environments ◽  
Particle Contaminants

Tribocharging of Particle Contaminants Evaluated as an Ignition Source in Oxygen-Enriched Environments

2009 ◽  
Vol 6 (8) ◽  
pp. 102317 ◽  
Author(s):  
Aditi Oza ◽  
Sudipto Ghosh ◽  
Kanchan Chowdhury ◽  
H. Barthelemy ◽  
S. W. Dean
Keyword(s):  
Ignition Source ◽  
Enriched Environments ◽  
Particle Contaminants

DEFLAGRATION-TO-DETONATION TRANSITION IN A STRATIFIED SYSTEM “GASEOUS OXYGEN-LIQUID FILM OF N-DECANE”

2020 ◽  
Author(s):  
S. M. FROLOV ◽  
◽  
V. S. AKSENOV ◽  
I. O. SHAMSHIN ◽  
◽  
...  
Keyword(s):  
Liquid Film ◽  
Ignition Source ◽  
Gaseous Oxygen ◽  
Deflagration To Detonation Transition ◽  
Operation Process ◽  
Continuous Detonation ◽  
Smooth Channel ◽  
Detonation Transition ◽  
Run Up ◽  
X 24

Deflagration-to-detonation transition (DDT) in the system “gaseous oxygen- liquid film of n-decane” ' with a weak ignition source was obtained experimentally. In a series of experiments with ignition by an exploding wire that generates a weak primary shock wave (SW) with a Mach number ranging from 1.03 to 1.4, the DDT with the detonation run-up distances 1 to 4 m from the ignition source and run-up time 3 ms to 1.7 s after ignition was observed in a straight smooth channel of rectangular 54 x 24-millimeter cross section, 3 and 6 m in length with one open end. The DDT is obtained for relatively thick films with a thickness of 0. 3-0.5 mm, which corresponds to very high values of the overall fuel-to-oxygen equivalence ratios of 20-40. The registered velocity of the detonation wave (DW) was 1400-1700 m/s. In a number of experiments, a high-velocity quasi-stationary detonation-like combustion front was recorded running at an average velocity of 700-1100 m/s. Its structure includes the leading SW followed by the reaction zone with a time delay of 90 to 190 s. The obtained results are important for the organization of the operation process in advanced continuous-detonation and pulsed-detonation combustors of rocket and air-breathing engines with the supply of liquid fuel in the form of a wall film.

Enriched Environments for Rodents and their Interaction with Nicotine Administration

2014 ◽  
Vol 6 (3) ◽  
pp. 191-200 ◽  
Author(s):  
Patricia Mesa-Gresa ◽  
Marta Ramos-Campos ◽  
Rosa Redolat
Keyword(s):  
Nicotine Administration ◽  
Enriched Environments

scholarly journals Thermal burns in electroconvulsive therapy

2021 ◽  
pp. 201010582110310
Author(s):  
Ernest Weisheng Ho ◽  
Eng Leonard ◽  
Lee Tih-Shih ◽  
Gregory James Meredith
Keyword(s):  
Case Report ◽  
Mood Disorders ◽  
Electroconvulsive Therapy ◽  
Ignition Source ◽  
Thermal Burns ◽  
High Impedance ◽  
Temporal Placement ◽  
Close Proximity ◽  
Life Threatening

Electroconvulsive therapy (ECT) is effective for mood disorders and schizophrenia. Thermal burns, while rare, are potentially sight and life threatening. The three elements necessary for a fire are often in close proximity during a session: an oxidiser (oxygen), an ignition source (faulty electrodes, poor contact with skin producing a spark) and fuel (hair, residual alcohol cleanser). This case report describes one such incident when a patient sustained a burn during ECT, with poor contact of electrode pad with skin, high impedance and an oxygen-rich environment possibly contributing. Given that ECT is conducted relatively frequently (once every 2–3 days) in a usual regimen, we make recommendations for safe application of electrode pads for temporal placement ECT.

Laser Ignition of Surgical Drape Materials in Air, 50% Oxygen, and 95% Oxygen

2004 ◽  
Vol 100 (5) ◽  
pp. 1167-1171 ◽  
Author(s):  
Gerald L. Wolf ◽  
George W. Sidebotham ◽  
Jackson L. P. Lazard ◽  
Jean G. Charchaflieh
Keyword(s):  
Carbon Dioxide ◽  
Operating Room ◽  
Oxygen Concentration ◽  
High Energy ◽  
Ignition Source ◽  
Laser Ignition ◽  
Surgical Tools ◽  
Time To Ignition ◽  
Room Fires ◽  
Surgical Laser

Background Operating room fires fueled by surgical drapes and ignited by high-energy surgical tools in air and oxygen-enriched atmospheres continue to occur. Methods The authors examined the time to ignition of huck towels and three commonly used surgical drape materials in air, 50% oxygen, and 95% oxygen using a carbon dioxide surgical laser as an ignition source. In addition, a phenol-polymer fabric was tested. Results In air, polypropylene and phenol polymer do not ignite. For polypropylene, the laser instantly vaporized a hole, and therefore, interaction between the laser and material ceased. When tested in combination with another material, the polypropylene time to ignition assumed the behavior of the material with which it was combined. For phenol polymer, the laser did not penetrate the material. Huck towels, cotton-polyester, and non-woven cellulose-polyester ignited in air with decreasing times to ignition. All tested materials ignited in 50% and 95% oxygen. Conclusion The results of this study reveal that with increasing oxygen concentration, the time to ignition becomes shorter, and the consequences become more severe. The possibility exists for manufacturers to develop drape materials that are safer than existing materials.

scholarly journals Environmental enrichment reduces aggression of pearl cichlid, Geophagus brasiliensis, during resident-intruder interactions

2010 ◽  
Vol 8 (2) ◽  
pp. 329-332 ◽  
Author(s):  
Vivian Oliveira Kadry ◽  
Rodrigo Egydio Barreto
Keyword(s):  
Habitat Complexity ◽  
Environmental Enrichment ◽  
Geophagus Brasiliensis ◽  
Prior Residence ◽  
Enriched Environments ◽  
Enrichment Condition ◽  
Resident Intruder

Among fishes, when residents and intruders fight, residents usually win, most likely because they value the residence more than intruders. We hypothesized that enriched environments increase the value of an area in dispute, causing a resident to more fiercely defend a resource-rich environment than a poor one. However, in the present study, intruder-resident tests with the pearl cichlid, Geophagus brasiliensis, showed environmental enrichment actually reduces aggression and can even lead to co-habitation without fighting. Additionally, in our experiments, the prior residence effect occurred irrespective of enrichment condition. Decreased visibility from increased habitat complexity reduces interactions between fish and consequently might explain the lower aggression observed herein.

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