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Search Results: 1 - 10 of 4998 matches for " Mildred Lemus Perez "
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Technico-Economical Evaluation of CO2 Transport in an Adsorbed Phase  [PDF]
Mildred Lemus Perez, Manuel Rodriguez Susa, Mario Pellerano, Arnaud Delebarre
Low Carbon Economy (LCE) , 2012, DOI: 10.4236/lce.2012.31004
Abstract: This work considers the possibility to transport CO2 in an adsorbed phase and analyzes its cost as a function of transported quantities, transport conditions and transportation means. CO2 adsorption capacities of 6 different adsorbents, comprising 4 activated carbons and 2 zeolites, were empirically evaluated in a given range of pressure and temperature. The adsorbent with the highest mass adsorption capacity (AC1), as well as another sorbent described in the literature (AC5) were selected to be used for CO2 transportation by ships, trains or trucks. Their characteristics and performances were then used to develop an economic analysis of transportation costs and CO2 emissions generated by the transport with or without storage. Economic evaluation of CO2 batch transport shows that CO2 transported in an adsorbed phase by train was seen to be almost competitive on distances between 250 and 500 km, in comparison to liquefied CO2. One of the activated carbon appeared to be competitive on short distances by truck when transport was not followed by storage. Ship transport of adsorbed CO2 on distances around 1500 km was competitive, when CO2 was used as delivered; there was an over cost of only 16%, when there was storage after the transport. The CO2 emissions generated by CO2 transport and storage when transport is carried out in an adsorbed phase were smaller than the ones generated by liquid phase transport below 1200 km, 500 km and 300 km by ship, train and truck respectively, as a function of the adsorbent used. Adsorbed CO2 transported on 1500 km by ship generated 27% less CO2 emissions than liquid phase and 17% by train for a distance of 250 km and 16% by truck on 150 km, although these differences were decreasing with the distance of transport.
On the relation between algebraic and configuration space calculations of molecular vibrations
F. Perez-Bernal,R. Bijker,A. Frank,R. Lemus,J. M. Arias
Physics , 1996, DOI: 10.1016/0009-2614(96)00612-4
Abstract: The relation between algebraic and traditional calculations of molecular vibrations is investigated. An explicit connection between interactions in configuration space and the corresponding algebraic interactions is established.
A Symmetry Adapted Approach to Molecular Spectroscopy: The Anharmonic Oscillator Symmetry Model
A. Frank,R. Lemus,R. Bijker,F. Perez-Bernal,J. M. Arias
Physics , 1996,
Abstract: We apply the Anharmonic Oscillator Symmetry Model to the description of vibrational excitations in ${\cal D}_{3h}$ and ${\cal T}_d$ molecules. A systematic procedure can be used to establish the relation between the algebraic and configuration space formulations, by means of which new interactions are found in the algebraic model, leading to reliable spectroscopic predictions. We illustrate the method for the case of ${\cal D}_{3h}$-triatomic molecules and the ${\cal T}_d$ Be-cluster.
A local anharmonic treatment of vibrations of methane
R. Lemus,F. Perez-Bernal,A. Frank,R. Bijker,J. M. Arias
Physics , 1996,
Abstract: The stretching and bending vibrations of methane are studied in a local anharmonic model of molecular vibrations. The use of symmetry-adapted operators reduces the eigenvalue problem to block diagonal form. For the 44 observed energies we obtain a fit with a standard deviation of 0.81 cm$^{-1}$ (and a r.m.s. deviation of 1.16 cm$^{-1}$).
A general algebraic model for vibrational molecular spectroscopy
A. Frank,R. Lemus,F. Perez-Bernal,R. Bijker,J. M. Arias
Physics , 1996,
Abstract: We present a symmetry-adapted version of the vibron model and discuss an application to D_{3h} triatomic molecules: H_3^+, Be_3 and Na_3^+.
Application of a symmetry-adapted algebraic model to the vibratioinal spectrum of methane
R. Lemus,F. Perez-Bernal,A. Frank,R. Bijker,J. M. Arias
Physics , 1996,
Abstract: The stretching and bending vibrations of methane are studied in the framework of a symmetry-adapted algebraic model. The model is based on the realization of the one-dimensional Morse potential in terms of a $U(2)$ algebra. For the 44 observed energies we obtain a fit with a r.m.s. deviation of 1.16 cm$^{-1}$ which is an order of magnitude more accurate than previous algebraic calculations.
A symmetry-adapted algebraic approach to molecular spectroscopy
A. Frank,R. Lemus,R. Bijker,F. Perez-Bernal,J. M. Arias
Physics , 1996,
Abstract: We apply a symmetry-adapted algebraic model to the vibrational excitations in D_3h and T_d molecules. A systematic procedure is used to establish the relation between the algebraic and configuration space formulations. In this way we have identified interaction terms that were absent in previous formulations of the vibron model. The inclusion of these new interactions leads to reliable spectroscopic predictions. We illustrate the method for the D_3h triatomic molecules, H_3^+, Be_3 and Na_3, and the T_d molecules, Be_4 and CH_4.
A general algebraic model for molecular vibrational spectroscopy
A. Frank,R. Lemus,R. Bijker,F. Perez-Bernal,J. M. Arias
Physics , 1996, DOI: 10.1006/aphy.1996.0129
Abstract: We introduce the Anharmonic Oscillator Symmetry Model to describe vibrational excitations in molecular systems exhibiting high degree of symmetry. A systematic procedure is proposed to establish the relation between the algebraic and configuration space formulations, leading to new interactions in the algebraic model. This approach incorporates the full power of group theoretical techniques and provides reliable spectroscopic predictions. We illustrate the method for the case of ${\cal D}_{3h}$-triatomic molecules.
Symmetry-adapted algebraic description of stretching and bending vibrations of ozone
F. Perez-Bernal,J. M. Arias,A. Frank,R. Lemus,R. Bijker
Physics , 1996, DOI: 10.1006/jmsp.1997.7296
Abstract: The vibrational excitations of ozone, including both bending and stretching vibrations, are studied in the framework of a symmetry-adapted algebraic approach. This method is based on the isomorphism between the U(2) algebra and the one-dimensional Morse oscillator, and the introduction of point group symmetry techniques. The use of symmetry-adapted interactions, which in the harmonic limit have a clear physical interpretation, makes it possible to systematically include higher order terms and anharmonicities. A least-square fit to all published experimental levels (up to ten quanta) of 16 O_3 and 18 O_3 yields a r.m.s. deviation of 2.5 and 1.0 1/cm, respectively.
Comment on ``Boson-realization model for the vibrational spectra of tetrahedral molecules''
R. Lemus,F. Perez-Bernal,A. Frank,R. Bijker,J. M. Arias
Physics , 1997, DOI: 10.1103/PhysRevA.56.4337
Abstract: An algebraic model in terms of a local harmonic boson realization was recently proposed to study molecular vibrational spectra [Zhong-Qi Ma et al., Phys. Rev. A 53, 2173 (1996)]. Because of the local nature of the bosons the model has to deal with spurious degrees of freedom. An approach to eliminate the latter from both the Hamiltonian and the basis was suggested. We show that this procedure does not remove all spurious components from the Hamiltonian and leads to a restricted set of interactions. We then propose a scheme in which the physical Hamiltonian can be systematically constructed up to any order without the need of imposing conditions on its matrix elements. In addition, we show that this scheme corresponds to the harmonic limit of a symmetry adapted algebraic approach based on U(2) algebras.
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