scholarly journals Characterization of surface fish-eye casting defect

2013 ◽  
Vol 66 (1) ◽  
pp. 99-103
Author(s):  
Adriano Murilo Rosário ◽  
Marcio Ferreira Hupalo
Keyword(s):  
Defect Formation ◽  
Chemical Characterization ◽  
Casting Defect ◽  
Green Sand ◽  
Cast Irons ◽  
Molding Sand ◽  
The Subject ◽  
Fish Eye ◽  
Ductile Iron Casting

Fish-eye defects are usually observed in the surface of ductile iron casting. Their formation mechanism is not fully understood and very little has been published concerning the subject. This paper investigates the sleeve material effect on fish-eye defect formation in ductile cast irons. Unburnt exothermic and insulating sleeves with different fluorine concentrations have been crushed and mixed in with green sand. These mixtures have been used as facing sands for the casting molds. The morphological and chemical characterization of the fish-eye defects have been performed by light optical microscopy (LOM) and scanning electron microscopy with energy-dispersive spectroscopy (SEM/EDS). Experimental results suggest that surface fish-eye defects on ductile cast irons are caused by the buildup of fluorine-containing sleeve materials in the molding sand.

scholarly journals Exploitation of Bentonite for Wastewater Treatment

2021 ◽  
Author(s):  
Kali Abderrahim ◽  
Loulidi Ilyasse ◽  
Amar Abdelouahed ◽  
Boukhlifi Fatima ◽  
Hadey Chaimaa ◽  
...  
Keyword(s):  
Chemical Characterization ◽  
Phenol Adsorption ◽  
Significant Percentage ◽  
Adsorption Study ◽  
The Subject ◽  
Uv Visible ◽  
Xrd Techniques ◽  
Kinetics Of ◽  
Langmuir And Freundlich Models

Bentonite is a clay with interesting surface properties (affinity for water, adsorption capacity for electro-positive compounds….). The characteristics and clarifying properties of bentonite from various companies are the subject of numerous studies. The present work focuses on the study of the efficiency of bentonite and modified bentonite to purify aqueous solutions containing organic pollutants such as phenol. First, before starting the adsorption study, a physical–chemical characterization of the clay by FTIR, BET and XRD techniques was undertaken. The specific surface of the bentonite is calculated by BET. Then, the study of isotherms and kinetics of phenol adsorption on commercial BTC showed that this pollutant can be removed from liquid effluents with a significant percentage. Langmuir and Freundlich models were applied. Finally, the kinetic study performed by UV–Visible was reproduced by FTIR spectroscopy.

Bias of the paleobotanical record as a consequence of variations in the chemical composition of higher vascular plant cuticles

Paleobiology ◽  
1991 ◽  
Vol 17 (2) ◽  
pp. 133-144 ◽  
Author(s):  
Erik W. Tegelaar ◽  
Hans Kerp ◽  
Henk Visscher ◽  
Pieter A. Schenck ◽  
Jan W. de Leeuw
Keyword(s):  
Chemical Composition ◽  
Higher Plants ◽  
Vascular Plant ◽  
Chemical Characterization ◽  
Pyrolysis Gas ◽  
Plant Cuticles ◽  
The Subject ◽  
The Impact ◽  
Curie Point Pyrolysis

The impact of the variations in the chemical composition of higher vascular plant cuticles on their fossil record is usually not considered in paleobotanical and, more particularly, taphonomic studies. Here we address the subject with reference to the chemical characterization of insoluble cuticular matrices of a large variety of recent and fossil cuticles. The cuticles were analyzed using Curie-point pyrolysis-gas chromatographic techniques. Cuticular matrices of extant higher plants consist either of the biopolyester cutin, the insoluble, non-hydrolyzable polymethylenic biopolymer cutan, or a mixture of both biopolymers. In fossil cuticles an additional cuticular matrix type consisting of cutan and cutin-derived material is recognized. On the basis of the variations in their chemical composition and the different behavior of the cuticular constituents (viz., cutin and cutan) during diagenesis, it is concluded that the paleobotanical record of cuticles will be biased toward taxa originally having a significant amount of cutan in their cuticular matrix.

scholarly journals Cryogenic Examination on Fiber Metal Laminates – A Short Critic

2019 ◽  
Vol 9 (1S4) ◽  
pp. 657-660
Keyword(s):  
Cryogenic Treatment ◽  
Chemical Characterization ◽  
Material Behavior ◽  
Heat Absorption ◽  
Fiber Metal Laminates ◽  
Materials Development ◽  
Physical Chemical ◽  
The Subject ◽  
Fiber Metal

Fiber Metal laminates (FML) have made its place in the prominence of the materials development whereby the study of its mechanical, physical, chemical characterization of the property of the material behavior have been studies and reported by various intellects. This paper delivers a scope of cryogenic treatment and the effect of the Fiber Metal laminates towards its property change and dialect behavior towards the subject of the material to the adverse cooling temperature. Every material holds a particular energy by its stances to the heat of addition which results due cause of the material heat absorption and quantum movement of the particles resulting in the energy due cause of molecular randomness.

Olfactory and Chemical Characterization of Indoor Air-Towards a Psychophysical Model for Air Quality

1981 ◽  
Author(s):  
Birgitta Berglund ◽  
Ulf Berglund ◽  
Thomas Lindvall ◽  
Helene Nicander-Bredberg
Keyword(s):  
Air Quality ◽  
Indoor Air ◽  
Chemical Characterization

PURIFICATION AND PARTIAL CHEMICAL CHARACTERIZATION OF SHEEP NEUROPHYSIN

1973 ◽  
Vol 74 (2) ◽  
pp. 226-236 ◽  
Author(s):  
Michel Chrétien ◽  
Claude Gilardeau
Keyword(s):  
Amino Acid ◽  
Polyacrylamide Gel Electrophoresis ◽  
Chemical Characterization ◽  
Terminal Amino Acid ◽  
Amino Acid Determination ◽  
Pituitary Glands ◽  
Terminal Amino ◽  
Partial Chemical ◽  
Acid Determination

ABSTRACT A protein isolated from ovine pituitary glands has been purified, and its homogeneity assessed by NH2- and COOH-terminal amino acid determination, ultracentrifugation studies, and polyacrylamide gel electrophoresis after carboxymethylation. Its chemical and immunochemical properties are closely similar to those of beef and pork neurophysins, less similar to those of human neurophysins. It contains no tryptophan (like other neurophysins) or histidine (like all except bovine neurophysin-I and human neurophysins). It has alanine at the NH2-terminus and valine at the COOH-terminus. Its amino acid composition is similar to, but not identical with those of porcine and bovine neurophysins.

Laboratory Methods for the Physico-Chemical Characterization of Recombinant Allergens as Reference Standards

Alergologia ◽  
2020 ◽  
Vol 1 (4) ◽  
pp. 7
Author(s):  
Mariana Vieru ◽  
Florin-Dan Popescu ◽  
Laura Haidar ◽  
Carmen Bunu-Panaitescu
Keyword(s):  
Chemical Characterization ◽  
Reference Standards ◽  
Recombinant Allergens ◽  
Laboratory Methods ◽  
Physico Chemical
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