scholarly journals Nitric Oxide Circumstances in Nitrogen-Oxide Seeded Low-Temperature Powling-Burner Flames

2017 ◽  
Vol 3 (3) ◽  
pp. 157
Author(s):  
M. Furutani ◽  
Y. Ohta ◽  
M. Nose
Keyword(s):  
Nitric Oxide ◽  
Low Temperature ◽  
Hydrogen Cyanide ◽  
Chemical Species ◽  
Nitrogen Monoxide ◽  
Cool Flame ◽  
Spectrum Measurement ◽  
Temperature Development ◽  
Flame Region ◽  
Blue Flame

<p>Flat low-temperature two-stage flames were established on a Powling burner using rich diethyl-ether/ air or n-heptane/air mixtures, and nitrogen monoxide NO was added into the fuel-air mixtures with a concentration of 240 ppm. The temperature development and chemical-species histories, especially of NO, nitrogen dioxide NO<sub>2</sub> and hydrogen cyanide HCN were examined associated with an emission-spectrum measurement from the low-temperature flames. Nitrogen monoxide was consumed in the cool-flame region, where NO was converted to the NO<sub>2</sub>. The NO<sub>2</sub> generated, however, fell suddenly in the cool-flame degenerate region, in which the HCN superseded. In the blue-flame region the NO came out again and developed accompanied with remained HCN in the post blue-flame region. The NO seeding into the mixture intensified the blue-flame luminescence probably due to the cyanide increase.</p>

Spectral study of the nitrogen monoxide interaction with sublimed layers of meso-mono-4-pyridyl-tri-phenyl- and meso-mono-3-pyridyl-tri-phenyl-porphyrinatocobalt(II)

2006 ◽  
Vol 10 (07) ◽  
pp. 971-977 ◽  
Author(s):  
Tigran S. Kurtikyan ◽  
Hayk A. Harutyunyan ◽  
Robert K. Ghazaryan ◽  
John A. Goodwin
Keyword(s):  
Nitric Oxide ◽  
Low Temperature ◽  
Nitrogen Monoxide ◽  
Pyridyl Group ◽  
Storage Devices ◽  
Nitrosyl Complexes ◽  
Coordination Sites ◽  
New Type ◽  
Sublimed Layers ◽  
Temperature Interaction

The low-temperature interaction of NO(15NO ) with sublimed layers of meso-mono-4-pyridyl-tri-phenyl- and meso-mono-3-pyridyl-tri-phenyl-porphyrinatocobalt(II) ( CoM4PyTPP (I) and CoM3PyTPP (II), respectively) has been investigated by means of FTIR and UV-visible spectroscopy. In addition to the stable five-coordinate nitrosyl complexes that are similar to the closely-related meso-tetraphenylporphyrinatocobalt(II)-nitrosyl Co(TPP)(NO) complex, a new type of complex with coordinated NO (15 NO ) has been found for the layers that were maintained at room temperature overnight before addition of nitric oxide at low temperature. The ν{ NO (15 NO )} in this species are more than 20 cm−1 lower than in five-coordinate compounds. These adducts are assigned to six-coordinate nitrosyl complexes, in which the fifth coordination site is occupied by the pyridyl group of the adjacent I (II) molecules. Warming the layers containing six-coordinate nitrosyl complexes of I almost completely transforms them to stable five-coordinate nitrosyl species indicating oligomers' disruption rather than loss of nitric oxide. In the case of II, however, a noticeable fraction of the six-coordinate species is left upon warming. Introducing new portions of NO to these layers at low temperature leads to formation of additional quantities of the six-coordinate species. Hence, part of six-coordinate complexes in II decomposed upon warming by releasing NO instead of by breaking Co -pyridyl bonds, therefore leaving free the sixth coordination sites in these layers. This result suggests a good possibility for creating solid state NO storage devices in which nitrogen monoxide can be kept and easily released by warming of the system.

scholarly journals Mutual Influences between Nitric Oxide and Paraoxonase 1

Antioxidants ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 619
Author(s):  
Marta Marín ◽  
Carlos Moya ◽  
Salvador Máñez
Keyword(s):  
Nitric Oxide ◽  
Chemical Species ◽  
Nitrogen Monoxide ◽  
Paraoxonase 1 ◽  
High Density Lipoproteins ◽  
Substrate Affinity ◽  
Special Focus ◽  
Loss Of Function ◽  
Oxide Synthase ◽  
Expression And Activity

One of the best consolidated paradigms in vascular pharmacology is that an uncontrolled excess of oxidizing chemical species causes tissue damage and loss of function in the endothelial and subendothelial layers. The fact that high-density lipoproteins play an important role in preventing such an imbalance is integrated into that concept, for which the expression and activity of paraoxonases is certainly crucial. The term paraoxonase (aryldialkyl phosphatase, EC 3.1.8.1) encompasses at least three distinct isoforms, with a wide variation in substrate affinity, cell and fluid localization, and biased expression of polymorphism. The purpose of this review is to determine the interactions that paraoxonase 1 has with nitric oxide synthase, its reaction product, nitric oxide (nitrogen monoxide, NO), and its derived reactive species generated in an oxidative medium, with a special focus on its pathological implications.

Lipid polymers accumulate in the epidermis and mestome sheath cell walls during low temperature development of winter rye leaves

PROTOPLASMA ◽  
1985 ◽  
Vol 125 (1-2) ◽  
pp. 53-64 ◽  
Author(s):  
Marilyn Griffith ◽  
N. P. A. Huner ◽  
K. E. Espelie ◽  
P. E. Kolattukudy
Keyword(s):  
Low Temperature ◽  
Cell Walls ◽  
Winter Rye ◽  
Sheath Cell ◽  
Mestome Sheath ◽  
Temperature Development

scholarly journals New clues for a cold case: nitric oxide response to low temperature

2014 ◽  
Vol 37 (12) ◽  
pp. 2623-2630 ◽  
Author(s):  
JULIETTE PUYAUBERT ◽  
EMMANUEL BAUDOUIN
Keyword(s):  
Nitric Oxide ◽  
Low Temperature ◽  
Cold Case

scholarly journals Modeling the regional impact of ship emissions on NO<sub>x</sub> and ozone levels over the Eastern Atlantic and Western Europe using ship plume parameterization

2010 ◽  
Vol 10 (14) ◽  
pp. 6645-6660 ◽  
Author(s):  
P. Huszar ◽  
D. Cariolle ◽  
R. Paoli ◽  
T. Halenka ◽  
M. Belda ◽  
...  
Keyword(s):  
Large Scale ◽  
Western Europe ◽  
Surface Ozone ◽  
Chemical Species ◽  
Nitrogen Monoxide ◽  
Ozone Production ◽  
Nox Emissions ◽  
Ship Emissions ◽  
Concentrated Source ◽  
The Impact

Abstract. In general, regional and global chemistry transport models apply instantaneous mixing of emissions into the model's finest resolved scale. In case of a concentrated source, this could result in erroneous calculation of the evolution of both primary and secondary chemical species. Several studies discussed this issue in connection with emissions from ships and aircraft. In this study, we present an approach to deal with the non-linear effects during dispersion of NOx emissions from ships. It represents an adaptation of the original approach developed for aircraft NOx emissions, which uses an exhaust tracer to trace the amount of the emitted species in the plume and applies an effective reaction rate for the ozone production/destruction during the plume's dilution into the background air. In accordance with previous studies examining the impact of international shipping on the composition of the troposphere, we found that the contribution of ship induced surface NOx to the total reaches 90% over remote ocean and makes 10–30% near coastal regions. Due to ship emissions, surface ozone increases by up to 4–6 ppbv making 10% contribution to the surface ozone budget. When applying the ship plume parameterization, we show that the large scale NOx decreases and the ship NOx contribution is reduced by up to 20–25%. A similar decrease was found in the case of O3. The plume parameterization suppressed the ship induced ozone production by 15–30% over large areas of the studied region. To evaluate the presented parameterization, nitrogen monoxide measurements over the English Channel were compared with modeled values and it was found that after activating the parameterization the model accuracy increases.

Prediction of CO and NOx Pollutants in a Stratified Bluff Body Burner

2017 ◽  
Author(s):  
Pascal Gruhlke ◽  
Fabian Proch ◽  
Andreas M. Kempf ◽  
Enric Illana Mahiques ◽  
Stefan Dederichs ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Carbon Monoxide ◽  
Bluff Body ◽  
Combustion Products ◽  
Combustion Model ◽  
Wide Range ◽  
Flame Region ◽  
Numerical Grid ◽  
Nitric Oxide Emissions ◽  
Heavy Duty Gas Turbine

The major exhaust gas pollutants from heavy duty gas turbine engines are CO and NOx. The difficulty of predicting the concentration of these combustion products originates from their wide range of chemical time scales. In this paper, a combustion model that includes the prediction of the carbon monoxide and nitric oxide emissions is tested. Large eddy simulations (LES) are performed using a compressible code (OpenFOAM). A modified flamelet generated manifolds (FGM) approach is applied with a thickened flame approach (ATF) to resolve the flame on the numerical grid, with a flame sensor to ensure that the flame is only thickened in the flame region. For the prediction of the CO and NOx emissions, pollutant species transport equations and a second, CO based, progress variable are introduced for the flame burnout zone to account for slow chemistry effects. For the validation of the models, the Cambridge burner of Sweeney and Hochgreb [1, 2] is employed, as both carbon monoxide and nitric oxide [3] data is available.

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