960 resultados para Nikitenko, A. (Aleksandr), 1804 or 5-1877.


Relevância:

40.00% 40.00%

Publicador:

Resumo:

"Aus der Chronik der Universität Kiel 1876/77."

Relevância:

40.00% 40.00%

Publicador:

Resumo:

Fine copy of al-Jaghmīnī's (d.1344) Qānūnchah, a compendium on medicine and an extract from Ibn Sīnā’s Qānūn. Brockelmann treats this author as distinct from an astronomer of the same name who died in 1221.

Relevância:

40.00% 40.00%

Publicador:

Resumo:

Mode of access: Internet.

Relevância:

40.00% 40.00%

Publicador:

Resumo:

Elegant autograph copy of the versified Persian-Turkish glossary of the müderris Osman Şakir (whose name appears in Īḍāḥ al-maknūn as ʻUthmān Shukrī, d.1818?). Apparently inspired by the popular Tuhfe-yi Vehbî (used for many years in Ottoman schools) of Sünbülzâde Vehbi Mehmet Efendi (d.1809), see opening matter on p.5-15.

Relevância:

40.00% 40.00%

Publicador:

Resumo:

Mode of access: Internet.

Relevância:

40.00% 40.00%

Publicador:

Resumo:

Nanoparticulate gold has emerged as a promising catalyst for diverse mild and efficient selective aerobic oxidations. However, the mechanism of such atom-economical transformations, and synergy with functional supports, remains poorly understood. Alkali-free Mg-Al hydrotalcites are excellent solid base catalysts for the aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA), but only in concert with high concentrations of metallic gold nanoparticles. In the absence of soluble base, competitive adsorption between strongly-bound HMF and reactively-formed oxidation intermediates site-blocks gold. Aqueous NaOH dramatically promotes solution phase HMF activation, liberating free gold sites able to activate the alcohol function within the metastable 5-hydroxymethyl-2-furancarboxylic acid (HMFCA) reactive intermediate. Synergistic effects between moderate strength base sites within alkali-free hydrotalcites and high gold surface concentrations can afford highly selective and entirely heterogeneous catalysts for aqueous phase aldehyde and alcohol cascade oxidations pertinent to biomass transformation.