Search Results

You are looking at 1 - 10 of 1,990 items for :

  • All content x
Clear All

Introduction In recent decades, the increase in CO 2 levels has become a burning issue because CO 2 is the primary greenhouse gas responsible for climate change [ 1 ]. On the other hand, CO 2 is a renewable source, which is

Restricted access

Merck index 1989 Moe, R. (1984): CO 2 enrichment in Scandinavia. Acta Horticulturae , 162, 217

Restricted access

Introduction The gasification of carbon in CO 2 1 is one of the main reactions when solid carbon is used as fuel and reducing agent. As early as in 1955, Von Fredersdorff [ 1 ] proposed that the gasification rate can

Restricted access

Pearce J., I. Czernichowski-Lauriol, S. Lombardi, S. Brune, A. Nádor, J. Baker, Pauwels, G. Hatziyannis, S. Beaubien, E. Faber 2004: A review of natural CO 2 accumulations in Europe as analogues for geological sequestration. A review of natural CO 2

Restricted access

Abstract  

Tetra-n-butyl ammonium bromide (TBAB) semi-clathrate (sc) hydrates of gas are of prime importance in the secondary refrigeration domain and in the separation of gas molecules by molecular size. However, there is a scarcity of dissociation enthalpies under pressure of pure gases and gases mixtures for such systems. In addition, the phase equilibrium of TBAB sc hydrates of several pure gases is not well defined yet as a function of the TBAB concentration and as a function of the pressure. In this paper, dissociation enthalpies and the phase equilibrium of TBAB sc hydrates of gas have been investigated by differential scanning calorimetry (DSC) under pressure. Pure gases such as N2 and CO2 and gases mixtures such as N2 +  CO2 and CH4 +  CO2 were studied. To our knowledge, we present the first phase diagram of TBAB sc hydrates of N2 for different pressures of gas in the TBAB concentration range from 0.170 to 0.350 wt. Enthalpies of dissociation of TBAB sc hydrates of pure gases and gases mixtures were determined as a function of the presssure for a compound with a congruent melting point whose hydration number corresponds to 26.

Restricted access

Invar® oxidation in CO2

Kinetics and mechanism of formation of a wüstite layer

Journal of Thermal Analysis and Calorimetry
Authors: S. Menecier, S. Valette, P. Denoirjean, and P. Lefort

when wüstite Fe 1− x O is formed [ 1 , 2 ] according to the reaction: 1 that requires a sample heating in CO/CO 2 mixtures or in pure CO 2 atmosphere. It was worth verifying if such a process could be applied to Invar ® . This alloy was

Restricted access
Orvosi Hetilap
Authors: Zoltán Sohajda, Ildikó Káldi, Magdolna Kiss, and Andrea Facskó

Assia, E. I., Rotenstreich, Y., Barequet, I. S., et al.: Experimental studies on nonpenetrating filtration surgery using the CO 2 laser. Graefes Arch. Exp. Ophthalmol., 2007, 245 (6

Restricted access

Introduction The increased CO 2 concentration in the atmosphere has been paid more and more attention since CO 2 is one of the major gases which cause greenhouse effect. Research shows that most CO 2 comes from combustion of

Restricted access
Acta Physiologica Hungarica
Authors: T. Yano, R. Afroundeh, R. Yamanak, T. Arimitsu, C. Lian, K. Shirkawa, and T. Yunoki

. 1999 87 332 338 Peng T, Niazy R, Payne SJ, Wise RG: The effects of respiratory CO 2 fluctuations in the resting-state BOLD signal differ between eyes open and eyes closed. Magnetic Resonance Imaging 31

Restricted access

Introduction The combustion of various carbonaceous materials has increased the amount of carbon dioxide (CO 2 ) in the atmosphere, which has consequently produced the greenhouse effect [ 1 – 3 ]. In order to solve this

Restricted access