Zobrazeno 1 - 10 of 13 pro vyhledávání: '"Ephrem G. Demissie"'
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Akademický článek
UV/VIS SPECTROMETER DETERMINATION OF CAFFEINE IN GREEN COFFEE BEANS FROM HARARGHE, ETHIOPIA, USING BEER-LAMBERT’S LAW AND INTEGRATED ABSORPTION COEFFICIENT TECHNIQUES
Autor: EPHREM G. DEMISSIE, GIRMA W. WOYESSA, ARAYASELASSIE ABEBE
Publikováno v: Scientific Study & Research: Chemistry & Chemical Engineering, Biotechnology, Food Industry, Vol 17, Iss 2, Pp 109-123 (2016)
A total of fifteen samples of green coffee (Coffea arabica L.) beans from the major producing region of Hararghe Ethiopia were studied using UV-Vis spectrometer measurement caffeine quantitative analysis from coffee beans. The number density of caffe
Externí odkaz: https://doaj.org/article/d8c2132258714dbc8f60e85bcdbc3f93
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Getting Ready for the Hydrogen Evolution Reaction: The Infrared Spectrum of Hydrated Aluminum Hydride–Hydroxide HAlOH + (H 2 O) n −1 , n= 9–14
Autor: Wai Kit Tang, Jakob Heller, Martin K. Beyer, Wing Ka Lam, Chi-Kit Siu, Milan Ončák, Christian van der Linde, Ephrem G. Demissie, Ethan M. Cunningham
Publikováno v: Angewandte Chemie International Edition. 60:16858-16863
Hydrated singly charged aluminum ions eliminate molecular hydrogen in a size regime from 11 to 24 water molecules. Here we probe the structure of HAlOH+ (H2 O)n-1 , n=9-14, by infrared multiple photon spectroscopy in the region of 1400-2250 cm-1 . Ba
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fd02891d5a70879b6ffd0100ee5e17d0
https://doi.org/10.1002/anie.202105166
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Decomposition of nitrous oxide in hydrated cobalt(i) clusters: a theoretical insight into the mechanistic roles of ligand-binding modes
Autor: Wai Kit Tang, Hayden Thompson, Chi-Kit Siu, Ephrem G. Demissie, Wing Ka Lam
Publikováno v: Physical Chemistry Chemical Physics. 23:16816-16826
Hydrated cobalt(i) cluster ions, [Co(H2O)n]+, can decompose the inert nitrous oxide molecule, N2O. Density functional theory suggests that N2O can anchor to Co+ of [Co(N2O)(H2O)n]+ through either O end-on (η1-OL) or N end-on (η1-NL) coordinate mode
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e29a36134d1009b21a7998558c8a98a
https://doi.org/10.1039/d1cp01820e
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8
Getting Ready for the Hydrogen Evolution Reaction: The Infrared Spectrum of Hydrated Aluminum Hydride-Hydroxide HAlOH
Autor: Jakob, Heller, Wai Kit, Tang, Ethan M, Cunningham, Ephrem G, Demissie, Christian, van der Linde, Wing Ka, Lam, Milan, Ončák, Chi-Kit, Siu, Martin K, Beyer
Publikováno v: Angewandte Chemie (International Ed. in English)
Hydrated singly charged aluminum ions eliminate molecular hydrogen in a size regime from 11 to 24 water molecules. Here we probe the structure of HAlOH+(H2O)n−1, n=9–14, by infrared multiple photon spectroscopy in the region of 1400–2250 cm−1
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::120dd60e9dc6f37cee058a475abfdf6d
https://pubmed.ncbi.nlm.nih.gov/34008243
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Modified solvatochromic equations for better estimation of ground and excited state dipole moments of p-aminobenzoicacid (PABA): Accounting for real shape over hypothetical spherical solvent shell
Autor: Girma W. Woyessa, E. Mengesha, Ephrem G. Demissie
Publikováno v: Journal of Photochemistry and Photobiology A: Chemistry. 337:184-191
Solvatochromic equations are critically dependent on the choice and values of the Onsager cavity radius, hence incorrect choice of the cavity radius could lead to erroneous estimates of dipole moment. The equations approximate a molecule as a point d
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::585c3c945b631cc9dd4d3411aebaecba
https://doi.org/10.1016/j.jphotochem.2016.12.034
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Spectrophotometric study on the stability constants and thermodynamic parameters of Zn2+, Cd2+ and Hg2+ complexes with Imino Thiazolidinone
Autor: Girma W. Woyessa, Ephrem G. Demissie, Tesfahun Kebede, Zewdu B. Gemechu, Solomon B. Kassa
Publikováno v: African Journal of Pure and Applied Chemistry. 9:175-183
The heterocyclic ligand (L), 3-(2-hydroxy phenyl)-2-iminothiazolidin-4-one, was synthesized by the cyclocondensation of o-hydoxy phenyl chloroacetamide with potassium thiocyanate. The stoichiometries of the title complexes were first determined by sp
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9e913451bd1e60b7c5bf3b4f83beff2b
https://doi.org/10.5897/ajpac2015.0636
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