Results 41 to 50 of about 538,729 (318)

Measurements of pernitric acid at the South Pole during ISCAT 2000 [PDF]

, 2002
The first measurements of pernitric acid at the South Pole were performed during the second Investigation of Sulfur Chemistry in the Antarctic Troposphere (ISCAT 2000). Observed HO2NO2 concentrations averaged 25 pptv.
Buhr, Martin, Chen, G, Davis, D D, Dibb, Jack E., Eisele, Fred, Huey, L Gregory, Kosciuch, E, Lefer, Barry, Mauldin, R L, Nowak, J, Shetter, R E, Slusher, D, Tanner, D   +12 more
core   +2 more sources

A chemical probe technique for the determination of reactive halogen species in aqueous solution: Part 1 – bromide solutions [PDF]

Atmospheric Chemistry and Physics, 2006
Reactive halogen species (X*=X•, •X2-, X2 and HOX, where X=Br, Cl, or I) in seawater, sea-salt particles, and snowpacks play important roles in the chemistry of the marine boundary layer.
B. M. Matthew, B. M. Matthew, C. Anastasio   +2 more
doaj  

Disentangling the chemistry and transport impacts of the quasi-biennial oscillation on stratospheric ozone [PDF]

Atmospheric Chemistry and Physics
The quasi-biennial oscillation (QBO) in tropical winds perturbs stratospheric ozone throughout much of the atmosphere via changes in transport of ozone and other trace gases, as well as via temperature changes, both of which alter ozone chemistry ...
J. Xie, J. Xie, Q. Tang, M. Prather, J. Richter, S. Zhang   +5 more
doaj   +1 more source

Numerical Characterization of Corona Spark Plugs and Its Effects on Radicals Production

Energies, 2021
A mono-dimensional code for the simulation of the effects of High Frequency Ignition systems (HFI) on the production of chemical radicals was developed and here presented.
Giorgio La Civita, Francesco Orlandi, Valerio Mariani, Giulio Cazzoli, Emanuele Ghedini   +4 more
doaj   +1 more source

Spatial distribution of small hydrocarbons in the neighborhood of the Ultra Compact HII region Monoceros R2 [PDF]

, 2013
We study the chemistry of small hydrocarbons in the photon-dominated regions (PDRs) associated with the ultra-compact HII region Mon R2. Our goal is to determine the variations of the abundance of small hydrocarbons in a high-UV irradiated PDR and ...
Berné, O., Bourlot, J. Le, Cernicharo, J., Fuente, A., García-Burillo, S., Gerin, M., Goicoechea, J. R., Gonzalez-García, M., Joblin, C., Kramer, C., Montillaud, J., Ossenkopf, V., Petit, F. Le, Pety, J., Pilleri, P., Treviño-Morales, S., Viti, S.   +16 more
core   +4 more sources

Modelling the effects of the October 1989 solar proton event on mesospheric odd nitrogen using a detailed ion and neutral chemistry model [PDF]

Annales Geophysicae, 2002
Solar proton events and electron precipitation affect the concentrations of middle atmospheric constituents. Ionization caused by precipitating particles enhances the production of important minor neutral constituents, such as nitric oxide ...
P. T. Verronen, P. T. Verronen, E. Turunen, Th. Ulich, E. Kyrölä   +4 more
doaj   +1 more source

Hydroxyl radical in/on illuminated polar snow: formation rates, lifetimes, and steady-state concentrations [PDF]

Atmospheric Chemistry and Physics, 2016
While the hydroxyl radical (•OH) in the snowpack is likely a dominant oxidant for organic species and bromide, little is known about the kinetics or steady-state concentrations of •OH on/in snow and ice.
Z. Chen, L. Chu, E. S. Galbavy, E. S. Galbavy, K. Ram, C. Anastasio   +5 more
doaj   +1 more source

Cryo-EM structure of respiratory complex I at work

eLife, 2018
Mitochondrial complex I has a key role in cellular energy metabolism, generating a major portion of the proton motive force that drives aerobic ATP synthesis.
Kristian Parey, Ulrich Brandt, Hao Xie, Deryck J Mills, Karin Siegmund, Janet Vonck, Werner Kühlbrandt, Volker Zickermann   +7 more
doaj   +1 more source

Circular Stochastic Fluctuations in SIS Epidemics with Heterogeneous Contacts Among Sub-populations

, 2011
The conceptual difference between equilibrium and non-equilibrium steady state (NESS) is well established in physics and chemistry. This distinction, however, is not widely appreciated in dynamical descriptions of biological populations in terms of ...
Alonso, Anderson, Anderson, Barabási, Bauch, Beard, Bharucha-Reid, Bjornstad, Colizza, Dangerfield, Durrett, Dushoff, Ethier, Fox, Ge, Gillespie, Gross, Hethcote, Hong Qian, Hufnagel, Jacquez, Jia-Zeng Wang, Jiang, Kot, Kwon, Lajmanovich, Liljeros, Lotka, May, Min Qian, Murray, Nåsell, Nåsell, Pastor-Satorras, Pastor-Satorras, Qian, Qian, Qian, Qian, Qian, Qian, Schneeberger, Simones, van Kampen, Vellela, Wang, Wolynes, Woolhouse, Zhang, Zhou, Zhou   +50 more
core   +1 more source

Stability of racemic and chiral steady states in open and closed chemical systems

, 2008
The stability properties of models of spontaneous mirror symmetry breaking in chemistry are characterized algebraically. The models considered here all derive either from the Frank model or from autocatalysis with limited enantioselectivity.
Avetisov, Benson, Blackmond, Blackmond, Brandenburg, Brandenburg, Caglioti, Chang, Crusats, David Hochberg, Eigen, Frank, Ganti, Giaquinta, Gleiser, Gleiser, Gleiser, Gridnev, Gutman, Hochberg, Hochberg, Hochstim, Josep M. Ribó, Kawasaki, Kawasaki, Kondepudi, Lebon, Lente, Mason, Mason, Mauksch, Mauksch, Mikami, Mills, Noorduin, Plasson, Plasson, Quack, Rivera Islas, Saito, Sandars, Soai, Soai, Viedma, Wattis   +44 more
core   +1 more source