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495  Articles
1 of 51 pages  |  10  records  |  more records»
Analysis of existing systems for expert grading of amber samples showed that their main disadvantages are, in general, consideration of only standard quality criteria  (weight, colour, inclusions), as well as the lack of evaluation of rare and unique... see more

The object of this paper is the novel Ambersons by Newton Booth Tarkington. This study focuses on the major question of how George Amberson Minafer, the major character, copes with his problem. The researcher employs a qualitative method in analyzing the ... see more

A method of copper (II) ion preconcentration and separation from other ions by using a column containing fatty hydroxamic acids - loaded Amberlite XAD 4 resin (FHA-Amb) is described. Several factors, which affect the separation and preconcentration e... see more

Synthesize of glycerol carbonate from glycerol and urea is an attractive path as glycerol carbonate has a large potential as a green solvent. The aim of the present study was to develop a kinetic model of glycerol carbonate synthesis with amberlyst-15 res... see more

The growing utilization of biodiesel as a renewable fuel has generated a large surplus of glycerol as a major byproduct. The prices of glycerol continue to drop in such an oversaturated market. Therefore, new uses are being developed for glycerol to produ... see more

The paper presents the results of an experimental study of Poleskiy amber luminescence excited by narrow band UV radiation (7 nm) at the wavelength range of 310–410 nm with step of 10 nm. The purpose of the study was to determine the relation between... see more

The increasing use of biodiesel as renewable fuels leads to the increasing of glycerol amount as a byproduct of biodiesel production. One of the glycerol derivative products that is environmentally friendly and renewable is glycerol carbonate. Glycerol ca... see more

Traditional healers in Pakistan use the herb Amberboa divaricata as tonic, aperiant, deobstruent, febrifuge, antidiarrheal, antiperiodic, antipyretic, anti-cough and in skin disorders. In vitro tissue experiments were carried out on rabbit jejunum to eluc... see more

No presente trabalho, foi estudada a síntese do TAME, em fase líquida, a partir de uma fração C5 e metanol, utilizando Amberlyst 15 como catalisador. A fração C5 utilizada possui uma diolefina, que tem uma alta tendência à formação de gomas e um alto teor... see more

1 of 51 pages  |  10  records  |  more records»