887 resultados para Van Wagoner, Murray Delos, 1898-


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This paper is devoted to an analysis of some aspects of Bas van Fraassen's views on representation. While I agree with most of his claims, I disagree on the following three issues. Firstly, I contend that some isomorphism (or at least homomorphism) between the representor and what is represented is a universal necessary condition for the success of any representation, even in the case of misrepresentation. Secondly, I argue that the so-called "semantic" or "model-theoretic" construal of theories does not give proper due to the role played by true propositions in successful representing practices. Thirdly, I attempt to show that the force of van Fraassen's pragmatic - and antirealist - "dissolution" of the "loss of reality objection" loses its bite when we realize that our cognitive contact with real phenomena is achieved not by representing but by expressing true propositions about them.

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Digital reproduction, The National Library of Finland, Centre for Preservation and Digitisation, Mikkeli

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Digital reproduction, The National Library of Finland, Centre for Preservation and Digitisation, Mikkeli

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Digital reproduction, The National Library of Finland, Centre for Preservation and Digitisation, Mikkeli

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Some handwritten text in both volumes.

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Some handwritten text in both volumes.

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Digital reproduction, The National Library of Finland, Centre for Preservation and Digitisation, Mikkeli

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A. E. Nordenskiöldin kokoelmaan kuuluva kuvitettu matkakertomus.

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Computational material science with the Density Functional Theory (DFT) has recently gained a method for describing, for the first time the non local bonding i.e., van der Waals (vdW) bonding. The newly proposed van der Waals-Density Functional (vdW-DF) is employed here to address the role of non local interactions in the case of H2 adsorption on Ru(0001) surface. The later vdW-DF2 implementation with the DFT code VASP (Vienna Ab-initio Simulation Package) is used in this study. The motivation for studying H2 adsorption on ruthenium surface arose from the interest to hydrogenation processes. Potential energy surface (PES) plots are created for adsorption sites top, bridge, fcc and hcp, employing the vdW-DF2 functional. The vdW-DF yields 0.1 eV - 0.2 eV higher barriers for the dissociation of the H2 molecule; the vdW-DF seems to bind the H2 molecule more tightly together. Furthermore, at the top site, which is found to be the most reactive, the vdW functional suggests no entrance barrier or in any case smaller than 0.05 eV, whereas the corresponding calculation without the vdW-DF does. Ruthenium and H2 are found to have the opposite behaviors with the vdW-DF; Ru lattice constants are overestimated while H2 bond length is shorter. Also evaluation of the CPU time demand of the vdW-DF2 is done from the PES data. From top to fcc sites the vdW-DF computational time demand is larger by 4.77 % to 20.09 %, while at the hcp site it is slightly smaller. Also the behavior of a few exchange correlation functionals is investigated along addressing the role of vdW-DF. Behavior of the different functionals is not consistent between the Ru lattice constants and H2 bond lengths. It is thus difficult to determine the quality of a particular exchange correlation functional by comparing equilibrium separations of the different elements. By comparing PESs it would be computationally highly consuming.

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Täydellinen nimeke: Inneming van Tavasthus in Finlant, door den Graef van Apraxin etc. nevens de groote nederlage der Zweden, met verlies hunner Trommels en Velt tekenen, en een groot getal van Krygs benden; voorgevallen den 6 van Wynmaent 1713 = Tavasthusa in Finlandia expugnata a Comite Apraxino etc. cum magna clade Suecorum, et jactura tympanorum et vexillorum, multarumque copiarum militarium 6 die Oct: an: 1713.

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