Results 181 to 190 of about 4,783 (204)

Volume charge distribution in carnauba wax electrets

Journal of Applied Physics, 1973
Internal charge distribution in carnauba wax thermoelectrets was measured. It was found that substantial volume charges exist within the electrets. These charges form a characteristic permanent volume charge distribution which is essentially the same for all investigated (over 100) electrets regardless of the magnitude of the electric field used for ...
David K. Walker, Oleg Jefimenko
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On the carnauba wax eiectret

1948 Conference on Electrical Insulation, 1948
A systematic study has been made of the permanent surface charges, which can be produced on discs of carnauba wax and lead to the formation of the electret. Different electrical and thermal treatments have been used-A complete experimental cycle included a) application of the polarizing voltage concomitant with thermal treatment, b) period of short ...
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Development of bionanocomposites of pectin and nanoemulsions of carnauba wax and neem oil pectin/carnauba wax/neem oil composites

Polymer Composites, 2019
AbstractThe search for biodegradable materials motivated the development of new materials for the food industry. Biomaterials (pectin, starch, and chitosan) are considered promising biodegradable polymers for developing or improving materials. This study aimed to develop biodegradable bionanocomposite films with neem oil and carnauba wax nanoemulsion ...
Silva, Priscila de Castro e, Oliveira, Ana C. S. de, Pereira, Lívio A. S., Valquíria, Michele, Carvalho, Gabriel R., Miranda, Kelvi W. E., Marconcini, José M., Oliveira, Juliano E.   +7 more
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Subchronic feeding study of carnauba wax in beagle dogs

Food and Chemical Toxicology, 1983
Carnauba wax fed at levels of 0.1, 0.3 and 1% in the diet to beagle dogs for 28 wk did not produce evidence of toxicity or pathological effects. Body weight gain, food consumption, clinical chemical, haematological, and urine analysis data, and organ weights of animals fed carnauba wax were comparable with those of control animals.
R A, Parent, G E, Cox, J G, Babish, M A, Gallo, F G, Hess, P J, Becci   +5 more
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Production and Stability of Carnauba Wax Nanoemulsion

Advanced Science, Engineering and Medicine, 2017
The study and manufacture of nanoemulsions from regional products has the potential to develop materials with optimized properties and add value to them. In this context, we evaluated the process of obtaining and analyzing nanoemulsions of carnauba wax, a Brazilian semiarid species. The method employed was high energy by ultrasound.
Silva, Priscila de Castro e, Pereira, Lívio Antônio Silva, Carvalho, Gabriel Ribeiro de, Campelo, Pedro Henrique, Botrel, Diego Alvarenga, Oliveira, Juliano Elvis, Marconcini, José Manoel   +6 more
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Carnauba wax as a wall material for urea microencapsulation

Journal of the Science of Food and Agriculture, 2018
AbstractBACKGROUNDThe high ureolytic activity of rumen microbiota is a concern when urea is used in ruminant feed, because it leads to fast urea conversion, resulting in possible intoxication and lower nitrogen utilization. This study intended to microencapsulate urea using carnauba wax to obtain slow‐release systems in the rumen.
Tiago Tavares Brito de Medeiros, Aderbal M de Azevedo Silva, André Leandro da Silva, Leilson Rocha Bezerra, Deuber L da Silva Agostini, Diego Lomonaco Vasconcelos de Oliveira, Selma E Mazzetto, Lloyd R Viana Kotzebue, Jéssica Ribeiro Oliveira, Gabriella S Barbosa Souto, Ariádne de Barros Carvalho, Antonio J Netto, Ronaldo Lopes Oliveira   +12 more
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Adsorption of radioactive ions on carnauba-wax aerosols

The European Physical Journal A, 1998
A new method based on parallel aerosol size spectrometry and γ-spectrometry is introduced for the measurement of short-lived radioactive ions, fission products or super-heavy elements produced at accelerators. Furthermore a new aerosol generator is presented.
A. Paul, U. Keyser
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Reproduction and subchronic feeding study of carnauba wax in rats

Food and Chemical Toxicology, 1983
The reproductive performance of Wistar rats fed carnauba wax at levels of 0.1, 0.3 or 1% in the diet and the effects of subchronic administration of carnauba wax at these dose levels on the resultant progeny were studied. Reproductive indices, body-weight gain, food consumption, haematological and clinical chemical data, ophthalmic, gross and ...
R A, Parent, T A, Re, J G, Babish, G E, Cox, K A, Voss, P J, Becci   +5 more
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Carnauba wax—Product of a Brazilian palm

Economic Botany, 1952
Carnauba occupies a leading position among vegetable waxes because of its hardness, good luster and high melting point, which make it especially desirable for floor polishes. The only source region of this important vegetable wax is northeastern Brazil.
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Carnauba Wax in United States--Brazilian Foreign Trade

Economic Geography, 1943
xN OT until war-time conditions alter the customary production and shipping of commodities in foreign commerce do many people appreciate the advantages of international trade or realize their own lack of general information concerning the commodities sent from distant corners of the earth.
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