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Gatera, Simon Pierre

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About this Item: VTR Publications, 2009. Paperback. Condition: New. Seller Inventory # INGM9783941750111

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Published by VTR Publications, United States (2009)

From: nike air max 90 sale australian
(London, United Kingdom)

About this Item: VTR Publications, United States, 2009. Paperback. Condition: New. Language: French . Brand New Book ***** Print on Demand *****.Ce livre remarquable de Simon Pierre Gatera nous rappelle le fait que Jesus-Christ est venu sur cette terre pour mettre en route un mouvement de discipulat et d implantation d Eglises. Simon Pierre Gatera nous dessine Jesus-Christ comme missionnaire, envoye par son Pere pour commencer un mouvement missionnaire. Il le fait a travers la strategie d un discipulat axe sur la mission. A cet effet, Jesus-Christ a choisi douze disciples, a vecu intimement avec eux pendant trois ans, les a instruits dans la theorie de la mission et les a mis au travail, deux a deux. Bien que nous ayons l impression qu ils n aient pas compris grand chose du vivant de leur Maitre, apres Pentecote, chacun des disciples est devenu un missionnaire a son tour. Les disciples et les chretiens qui se sont convertis a travers eux ont compris que le bapteme implique un appel au partage de ce qu ils avaient vecu dans la marche intime avec le Christ. Des Eglises ont ainsi vu le jour un peu partout et ont commence a se multiplier. A la base de ces mouvements, il y a eu un travail serieux de discipulat axe sur la mission. Malheureusement, cette vision et ce serieux au travail de discipulat manquent souvent. Simon Pierre Gatera comble donc une lacune, et il le fait d une maniere tout a fait competente. Seller Inventory # AAV9783941750111

This may be contrasted with the following picture which shows a schematic of a reconstructed surface - this particular example is similar to the "missing row model" proposed for the structure of a number of reconstructed (110) fcc metal surfaces.

Since reconstruction involves a change in the periodicity of the surface and in some cases also a change in surface symmetry, it is readily detected using surface diffraction techniques (e.g. LEED RHEED ).

The overall driving force for reconstruction is once again the minimization of the surface free energy - at the atomic level, however, it is not always clear why the reconstruction should reduce the surface free energy. For some metallic surfaces, it may be that the change in periodicity of the surface induces a splitting in surface-localized bands of energy levels and that this can lead to a lowering of the total electronic energy when the band is initially only partly full.

In the case of many semiconductors, the simple reconstructions can often be explained in terms of a "surface healing" process in which the co-ordinative unsaturation of the surface atoms is reduced by bond formation between adjacent atoms. For example, the formation of a Si(100) surface requires that the bonds between the Si atoms that form the new surface layer and those that were in the layer immediately above in the solid are broken - this leaves two "dangling bonds" per surface Si atom.

A relatively small co-ordinated movement of the atoms in the topmost layer can reduce this unsatisfied co-ordination - pairs of Si atoms come together to form surface "Si dimers", leaving only one dangling bond per Si atom. This process leads to a change in the surface periodicity : the period of the surface structure is doubled in one direction giving rise to the so-called (2x1) reconstruction observed on all clean Si(100) surfaces [ nike air max 2011 leather white sneakers
].

In this section, attention has been concentrated on the reconstruction of clean surfaces. It is, however, worth noting that reconstruction of the substrate surface is frequently induced by the adsorption of molecular or atomic species onto the surface - this phenomenon is known as adsorbate-induced reconstruction (see nike air air force 1 white and black
for some examples).

Summary

The minimisation of surface energy means that even single crystal surfaces will not exhibit the ideal geometry of atoms to be expected by truncating the bulk structure of the solid parallel to a particular plane. The differences between the real structure of the clean surface and the ideal structure may be imperceptibly small (e.g. a very slight surface relaxation ) or much more marked and involving a change in the surface periodicity in one or more of the main symmetry directions ( surface reconstruction ).

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