Kommentteja Matti Virtaselle "Sukupolvi"-artikkeliin

Kommentti Matti Virtasen artikkeliin (Sosiologia 2/1999)

Effect of milk coagulation properties of herd bulk milks on yield and composition of Emmental cheese

Selostus: Tankkimaidon juoksettumisominaisuuksien vaikutus Emmental-juuston määrään ja koostumukseen

The effect of ammonium ferric hexacyanoferrate on reducing radiocaesium transfer from grass silage to sheep

Selostus: [sup 134]Cs-aktiivisuuspitoisuuden vähentäminen ferriheksasyanoferraatin avulla

Laskutaito ja numeroiden lukutaito edelleen tarpeen

Artikkeli on huomautus Timo Tossavaisen ja Tuomas Sorvalin kirjoitukseen "Matematiikka, koulumatematiikka ja didaktinen matematiikka" (Tieteessä tapahtuu 8/2003)

Koulutus ja tutkimus 2003-2008 on kehittämissuunnitelma ja osa valtioneuvoston strategiaa

Kirjoitus on vastaus professori Matti Virénin kysymykseen TT-lehdessä 5/2004

Natural development of stand structure in peatland Scots pine following drainage : results based on long-term monitoring of permanent sample plots

Abstract

Thinning intensity and growth of mixed spruce-birch stands on drained peatlands in Finland

Abstract

Impacts of different thinning regimes in the yield of uneven-structured Scots pine stands on drained peatland

Abstract

Poisoning effect of s on pd surfaces

In this study we observe the poisoning effect of S to the adsorption and dissociation of 02 molecule on Pd surfaces. To perform this study we used Viennaab initio Simulation Package (VASP) and Spanish Initiative for Electronic structure with thousands of Atoms (SIESTA) ab initio softwares. To describe all Pd surfaces we selected the (100), and (211) surfaces, because we need very reactive and simple surfaces. Before studying the poison¬ing effect of S we had to study the dissociation of 02 on the surfaces. We discovered that on the (100) surface the hollow site is the most reactive site, but at room temperature the steric hinderace effect occurs very easily. If the molecule has enough vibrational energyit will dissociate. On the (211) surface the (100) micro facet's hollow site is the most reactive site and the molecule dissociates in the site without any barrier, and the molecule drifts from the terrace to this site. An S atom sticks on the Pd (100) surface in the hollow site. It affects the d-band density of states of the nearests Pd atoms; It moves the center of the d-band downin energy, when the bond between the Pd atom and the 0 atom is more antibonding. In the hollow site the S atom also blocks the dissociation site of the molecule. On the Pd(211) surface the energetically favourable site of the S atom is the(100) microfacet's hollow site. There it blocks the most reactive site, but its effect to the Pd atoms next to it is not significant.