995 resultados para 621


Relevância:

10.00% 10.00%

Publicador:

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Archivo Fotográfico

Relevância:

10.00% 10.00%

Publicador:

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Département de linguistique et de traduction

Relevância:

10.00% 10.00%

Publicador:

Resumo:

The Lewis acidity of yttrium and dysprosium exchanged zeolite Y and ZSM-5 has been determined by titration method using Hammett indicators. The acidity of the Y form increases with increase in concentration of the rare earth cation in the Y zeolite. It is independent of the amount of the rare earth ion for ZSM-5. The data have been correlated with the activity of these zeolites for the esterification of butanol using acetic acid.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

We have measured prompt and delayed emission spectra of electrons from foilexcited Be, B^+, and Be^2+ ions at 300 keV. On the basis of recently calculated eigenvalues we identified two lines in the prompt Be^+ spectrum as transitions from 2s^22p and 2s2p^2. The delayed Be spectrum indicates that transitions from highly excited quintet states occur. We propose radiationless deexcitation with one excited spectator electron not involved in the transition.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Cuaderno de trabajo para alumnos de Ense??anza Secundaria dividido en tres grandes apartados: la historia animada de la huerta; sus se??as de identidad; su apariencia f??sica: el paisaje huertano. El cuaderno incluye una serie de actividades de experimentaci??n, vocabulario espec??fico relacionado con formas de riego y cultivo de la huerta de Murcia. Tambi??n aparecen p??ginas de vi??etas y pasatiempos.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Material fotocopiado

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Projecte de millores d'infrastructures de la urbanització de Santa Maria de Llorell (Tossa de Mar

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Resumen tomado de la publicaci??n