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Introduction This work deals with two aspects of catalysis. The first one is the mechanism of hydrogen oxidation on silver. This reaction is essential for chemical kinetics and catalysis as a model catalytic redox reaction. It

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Abstract  

Silver from aqueous solution was preconcentrated by adsorption on activated carbon as silver xanthate. Factors influencing the adsorption of silver have been studied. Optimum conditions for the preconcentration of silver have been established.

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[ 16 ]. Raja et al. [ 17 ] reported increases of thermal and electrical conductivities of PU composites containing increasing amounts (1–5 wt%) of carbon nanotubes that were decorated with silver and copper nanoparticles but the main focus of this study

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A Silver–Russell-szindróma diagnosztikai lépései és terápiás lehetőségei egy családi halmozódást mutató eset kapcsán

Diagnostics and follow-up strategy for Silver–Russell syndrome based on a case report showing familial accumulation

Orvosi Hetilap
Authors:
Árpád Ferenc Kovács
,
Nikolett Jusztina Beniczky
,
Rita Ágnes Bertalan
, and
Ágnes Sallai

. 128–131. 2 Kaiser É, Weisenbach J, Méhes K, et al. Silver–Russell syndrome in a 5 and one half-year-old boy. [Silver–Russell-szindróma 5 és fél éves

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College on ancient strategy. How could Hannibal achieve these feats if not with economic resources that came from Iberia, not Carthage, especially when Carthage considered all these exploits “Hannibal's War”? The importance of Iberian silver, from

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The thermal decompositions of the even silver dicarboxylates from silver oxalate to silver sebacate were studied. In vacuum, the dicarboxylates decomposed to give metallic silver, CO2 and organic diradicals as primary products, and polymers as secondary products. The higher silver dicarboxylates were much more stable to thermal treatment than silver oxalate, probably due to the initiation of decomposition of all carboxylates except silver oxalate by the rupture of a Ag-O and not a C-C bond.

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Abstract  

We studied the Y–Ba–Cu–O/Ag equilibrium diagram in oxygen atmosphere around the composition YBa2Cu3Ox/Ag35 mass%. We found a high thermal effect: the peritectic decomposition temperature of Y-123 phase is lowered from 1040 to 940C. We demonstrate here that the nature of the phenomenon is not chemical. We explained it as the result of a mechanical segregation of Y-123 decomposition products from Y-123 phase, performed by silver.

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Journal of Thermal Analysis and Calorimetry
Authors:
L. Chmielarz
,
M. Zbroja
,
P. Kuśtrowski
,
B. Dudek
,
A. Rafalska-Łasocha
, and
R. Dziembaj

Abstract  

Alumina, zirconia and titania pillared montmorillonites additionally modified with silver were tested as catalysts of NO reduction with NH3 or C2H4. Ammonia was much more effective reducer of NO than ethylene. The silver containing TiO2-pillared clay has been found to be the most active catalyst for NO reduction both with NH3 or C2H4. Oxidation of the reducing agents by oxygen limited the NO conversion in the high temperature region. The ammonia and nitric oxide adsorption sites were studied by the temperature programmed desorption methods (TPD).

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Conflicting results have been reported by different workers on the thermal decomposition of silver carbonate, Ag2CO3. In the present study, the decomposition mechanism was elucidated by various analytical methods; gas analysis (differential thermal gas analyses) in helium, carbon dioxide and oxygen flows with and without a P2O5 trap or a KOH trap, DTA-TG in a carbon dioxide flow and high-temperature X-ray diffraction analysis in a carbon dioxide flow.

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Silver-magnesium alloys containing 0.04, 0.35 and 2.3 at % Mg have been investigated at 803 K. Calorimetric measurements permit explanation of the hardness and electrical resistivity caused by the dispersion of oxide particles during the process of internal oxidation. It appears that in low-concentration alloys there is no thermal effect and that the stability of dispersed oxide particles is probably due to a significant entropy Results are qualitatively the same as for Ag-Cu alloys.

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