Results 271 to 280 of about 539,119 (298)
Some of the next articles are maybe not open access.
The study of soil chemistry through quasi-steady-state models: II. Acidity of soil solution
Geochimica et Cosmochimica Acta, 1990Abstract The acidity of three hypothetical soil solutions was studied with a quasi-steady-state model. Processes were assigned to one of three time scales: fast (processes at equilibrium), slow (processes for which the kinetics are specified explicitly), or very slow (processes that have a negligible effect on the steady-state solution).
Gerhard Furrer +2 more
openaire +1 more source
Canadian Journal of Chemistry, 1999
Direct photolysis of 1-phenylsilacyclobutane and 1-phenyl-, 1-(2-phenylethynyl)-, and 1-(4'-biphenylyl)-1-methylsilacyclobutane in hexane solution leads to the formation of ethylene and the corresponding 1-arylsilenes, which have been trapped by photolysis in the presence of methanol.
William J. Leigh +4 more
openaire +1 more source
Direct photolysis of 1-phenylsilacyclobutane and 1-phenyl-, 1-(2-phenylethynyl)-, and 1-(4'-biphenylyl)-1-methylsilacyclobutane in hexane solution leads to the formation of ethylene and the corresponding 1-arylsilenes, which have been trapped by photolysis in the presence of methanol.
William J. Leigh +4 more
openaire +1 more source
Journal of Geophysical Research: Atmospheres, 1985
An atmosphere model composed of a narrow band radiative‐convective (RC) code coupled with a one‐dimensional chemistry and transport code is described. The RC model, formulated in log‐pressure coordinates, includes accurate solar absorption calculations for O3, O2, H2O, and CO2.
A. J. Owens +5 more
openaire +1 more source
An atmosphere model composed of a narrow band radiative‐convective (RC) code coupled with a one‐dimensional chemistry and transport code is described. The RC model, formulated in log‐pressure coordinates, includes accurate solar absorption calculations for O3, O2, H2O, and CO2.
A. J. Owens +5 more
openaire +1 more source
Journal of Physical Organic Chemistry, 2001
AbstractThe resolution of the kinetics of the reversible consecutive second‐order reaction mechanism involving the formation of a kinetically significant intermediate, which does not reach steady state before late in the first half‐life, followed by an irreversible product‐forming reaction is discussed. It is shown that an apparent second‐order rate
Vernon D. Parker, Yixing Zhao
openaire +1 more source
AbstractThe resolution of the kinetics of the reversible consecutive second‐order reaction mechanism involving the formation of a kinetically significant intermediate, which does not reach steady state before late in the first half‐life, followed by an irreversible product‐forming reaction is discussed. It is shown that an apparent second‐order rate
Vernon D. Parker, Yixing Zhao
openaire +1 more source
Journal of Chemical Education, 2014
A numerical analysis of the free radical addition polymerization system is described that provides those teaching polymer, physical, or advanced organic chemistry courses the opportunity to introduce students to numerical methods in the context of a simple but mathematically stiff chemical kinetic system.
H. Darrell Iler +4 more
openaire +1 more source
A numerical analysis of the free radical addition polymerization system is described that provides those teaching polymer, physical, or advanced organic chemistry courses the opportunity to introduce students to numerical methods in the context of a simple but mathematically stiff chemical kinetic system.
H. Darrell Iler +4 more
openaire +1 more source
Free Radical Biology and Medicine, 2001
Apoptosis was studied under conditions that mimic the steady state of H(2)O(2) in vivo. This is at variance with previous studies involving a bolus addition of H(2)O(2), a procedure that disrupts the cellular homeostasis. The results allowed us to define three phases for H(2)O(2)-induced apoptosis in Jurkat T-cells with reference to cytosolic steady ...
F, Antunes, E, Cadenas
openaire +2 more sources
Apoptosis was studied under conditions that mimic the steady state of H(2)O(2) in vivo. This is at variance with previous studies involving a bolus addition of H(2)O(2), a procedure that disrupts the cellular homeostasis. The results allowed us to define three phases for H(2)O(2)-induced apoptosis in Jurkat T-cells with reference to cytosolic steady ...
F, Antunes, E, Cadenas
openaire +2 more sources
Fuel, 1980
Abstract The chemical reduction of SO2 with North Dakota lignite has been discovered to be a facile reaction which occurs at a relatively low temperature of 600–650 °C. Under optimum conditions, the reaction chemistry can be controlled to allow 85–90% conversion of SO2 to free sulphur in a single-stage reaction.
C RATCLIFFE, G PAP
openaire +1 more source
Abstract The chemical reduction of SO2 with North Dakota lignite has been discovered to be a facile reaction which occurs at a relatively low temperature of 600–650 °C. Under optimum conditions, the reaction chemistry can be controlled to allow 85–90% conversion of SO2 to free sulphur in a single-stage reaction.
C RATCLIFFE, G PAP
openaire +1 more source
Canadian Journal of Fisheries and Aquatic Sciences, 2002
Critical loads of acidity and the amount by which these critical loads are exceeded by atmospheric deposition (termed "exceedances") were estimated for 1469 lakes from five regions in south-central Ontario, Canada, using single lake chemistry measurements and sulphur deposition data for the period 19761999.
A Henriksen, P J Dillon, J Aherne
openaire +1 more source
Critical loads of acidity and the amount by which these critical loads are exceeded by atmospheric deposition (termed "exceedances") were estimated for 1469 lakes from five regions in south-central Ontario, Canada, using single lake chemistry measurements and sulphur deposition data for the period 19761999.
A Henriksen, P J Dillon, J Aherne
openaire +1 more source
Environmental Pollution, 1989
Data on deposition and streamwater chemistry, obtained for the upper catchment of the River Duddon in the 1970s and 1980s, are reviewed. These data, together with soil chemical data, are used to deduce key processes in the deposition-catchment interaction, the analysis being based on current concepts of acidification.
openaire +2 more sources
Data on deposition and streamwater chemistry, obtained for the upper catchment of the River Duddon in the 1970s and 1980s, are reviewed. These data, together with soil chemical data, are used to deduce key processes in the deposition-catchment interaction, the analysis being based on current concepts of acidification.
openaire +2 more sources
SPE Heavy Oil Conference Canada, 2012
Abstract This paper describes the production chemistry management process undertaken during the design, commissioning and start-up phases of the Schoonebeek redevelopment. Challenging separation issues, saline water, together with a multitude of other process conditions, resulted in complex, but robust application portfolio.
Andrew G. Shepherd +6 more
openaire +1 more source
Abstract This paper describes the production chemistry management process undertaken during the design, commissioning and start-up phases of the Schoonebeek redevelopment. Challenging separation issues, saline water, together with a multitude of other process conditions, resulted in complex, but robust application portfolio.
Andrew G. Shepherd +6 more
openaire +1 more source