Isomeric carbon dioxide gaseous dimer system: a new record isomerism contribution into heat capacity

1988 ◽  
Vol 92 (20) ◽  
pp. 5836-5839 ◽  
Author(s):  
Zdenek Slanina
Keyword(s):  
Carbon Dioxide ◽  
Heat Capacity ◽  
New Record ◽  
System A

scholarly journals STUDIES IN RESPIROMETRY

1932 ◽  
Vol 16 (1) ◽  
pp. 5-22 ◽  
Author(s):  
William R. Thompson
Keyword(s):  
Carbon Dioxide ◽  
Closed System ◽  
System A ◽  
Moist Environment ◽  
Considerable Detail ◽  
Oxygen Concentrations

A machine has been described which combines volumetric and refractometric means of observing changes in carbon dioxide and oxygen concentrations and amounts in a closed system suitable for containing a respiring system. A means of thermoregulation has been described briefly. The theory upon which estimation is based has been outlined in considerable detail and generality; indicating how dependence upon absorption of gases by reagents can be eliminated completely, although they may be used in certain instances as a means of independent check. An experiment of this nature has been reported as an illustration of one use of the machine. Data of other experiments in which a moist environment was employed for the respiring system will be given in another communication.

Bicarbonate-carbon dioxide buffer system: a determinant of the mitochondrial pH gradient

1984 ◽  
Vol 247 (3) ◽  
pp. F440-F446 ◽  
Author(s):  
D. P. Simpson ◽  
S. R. Hager
Keyword(s):  
Carbon Dioxide ◽  
Renal Cortex ◽  
Ph Gradient ◽  
Buffer System ◽  
Acid Base ◽  
Bicarbonate Buffer ◽  
Inner Membrane ◽  
System A ◽  
Intact Kidney ◽  
The Difference

The influence of the bicarbonate-carbon dioxide buffer system on the pH gradient (delta pH) across the inner membrane of mitochondria from rabbit renal cortex was studied with and without phosphate in the medium. delta pH with bicarbonate buffer or phosphate in the medium was greater at low than at high medium pH so that the difference (delta delta pH) between delta pH at pH 7.1 and at 7.6 was positive. Varying the concentration of phosphate from 0 to 10 mM had little effect on delta delta pH produced by bicarbonate buffer. Inhibition of the phosphate-hydroxyl carrier with N-ethylmaleimide abolished delta delta pH when phosphate was present in non-bicarbonate-containing media. With bicarbonate buffer present, N-ethylmaleimide increased delta delta pH. Similar effects were observed in mitochondria from liver and heart as well as from kidney. The effects of the bicarbonate buffer system on delta pH may result either from an inner membrane permeable to carbon dioxide but not to bicarbonate ion or from an active carrier for bicarbonate ion in the inner membrane. In intact kidney cells, the influence of the bicarbonate buffer system on delta pH may provide a mechanism for regulating substrate metabolism in response to acid-base changes. It may also serve in many organs to reduce fluctuations in matrix pH when alterations in cytoplasmic pH occur.

scholarly journals Review of existing and development of a novel mathematical model for supercritical CO2 cycles working fluid

2018 ◽  
Vol 240 ◽  
pp. 01036
Author(s):  
Marcin Wołowicz ◽  
Jarosław Milewski ◽  
Piotr Lis
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
Mathematical Model ◽  
Heat Capacity ◽  
Supercritical Co2 ◽  
Pressure Range ◽  
Critical Conditions ◽  
Working Fluid ◽  
Critical Properties ◽  
Area Of Interest

The paper aims to compare the models of working fluids against experimental data for carbon dioxide close to its critical conditions. Fortunately, most of the work is already done and published where the authors compared the models based on the equation of the state (EoS). There are a few other models which were not investigated, thus we would like to add a few new results here and focus only on near-critical properties where the biggest deviation between experimental and calculated properties can be observed. The area of interest was pressure range of 7.39 – 20 MPa and temperature range of 304-340 K just above fluid critical point (7.39 MPa, 304.25 K). Model validation was performed for density and heat capacity as one of the most important parameters in preliminary cycle analysis.

State Estimation Based on Nonlinear Observer for Hydrogen Production in a Photocatalytic Anaerobic Bioreactor

2017 ◽  
Vol 15 (5) ◽  
Author(s):  
Ricardo Aguilar López ◽  
Beatriz Ruiz Camacho ◽  
M. Isabel Neria-González ◽  
Eduardo Rangel ◽  
Omar Santos ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Production ◽  
Lyapunov Stability Theory ◽  
Nonlinear Observer ◽  
Sulfate Concentration ◽  
Continuous Processes ◽  
Sulfate Reducing ◽  
Continuous Bioreactor ◽  
System A ◽  
Modeling Errors

Abstract Hydrogen concentration in a photocatalytic continuous bioreactor was estimated. For the above system, a novel kinetic model of the sulfate-reducing process for hydrogen production was proposed and experimentally confirmed. In addition, we present the design of an estimator based on nonlinear observer, which is robust against modeling errors, to estimate the observable states of the bioreactor. Sulfate, biomass, sulfide, carbon dioxide, cadmium in liquid, cadmium sulfide, and hydrogen concentrations were estimated in spite of errors in the evaluation of the parameters using sulfate concentration as measurable output. The convergence of the proposed observer was analyzed using Lyapunov stability theory. Finally, maximum hydrogen production was 225 mL and 175 mL for batch and continuous processes, respectively.

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