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Copyright of Avances is the property of Instituto de Informacion Cientifica y Tecnologica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

We recorded the presence of an individual of Ruddy Duck (Oxyura jamaicensis) with diluted plumage and two of the Northern Shoveler (Spatula clypeata), one with progressive graying and another one with partial leucism in Lake Nabor Carrillo, Texcoco, State of Mexico. These observations represent the first records of aberrant coloration for these species in Mexico. Documenting such cases can help to understand the frequency of chromatic aberrations, as well as mechanisms of speciation in different groups of birds. [ABSTRACT FROM AUTHOR]

Introduction: There is a problem of recovering parts with large worn surfaces in industry. Filling is applied by manual electric arc welding for this, with low productivity when using small diameters cylindrical electrodes, operated with low current intensities. Objective: To evaluate operating and melting behavior of a coated electrode with a rectangular section core and a rutile coating. Materials and methods: Rutile coating was applied by pressing in molds. Operational performance was qualitatively evaluated by applying expert criteria. In addition, the consumption parameters were determined according to the standard (ISO 2401-72, 1972). The effect of core width and current intensity on consumption and dilution parameters was experimentally determined. Statistical processing was carried out with Statgraphics software. Results and Discussion: Electrodes have good operating properties as excellent arc stability is obtained in 77.8% of them, excellent slag detachment in 100%, good appearance and cord health in 77% and 88.9% respectively. The average deposition coefficient was 0.16 g/A*min, deposition efficiency of 80.6% and dilution of 30.5%. Conclusions: Obtained electrodes showed good operating behavior during welding tests, which allows the filling process in parts affected by wear. Dilution in deposited by these electrodes metal is less than in equivalent cylindrical electrodes, which constitutes a significant advantage in recharge processes. [ABSTRACT FROM AUTHOR]

Copyright of Tropelías: Revista de Teoría de la Literatura y Literatura Comparada is the property of Prensas Universitarias de Zaragoza and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

At the paper it is reported the effect of coated factor in the behavior of coated tubular electrodes for hardfacing by SMAW of components of the sugar industry, as to consumption parameters and the geometry of the deposited metal. The electrodes were made with different coating thickness for a fixed diameter of the metal tube and coating composition, in order to value the exclusive influence that the thickness has. Each coating factor (relation between the total diameter of the electrode and the diameter of the metal tube) was evaluated as a function of the variation in welding current. Deposits over the metal plate were made, letting evaluate the geometrical dimensions of the welding bead and the consumption parameter of electrodes. Was concluded that for those electrodes the value of the coating factor have to be 1,2 and showing the best integral performance for the hardfacing of pieces around an average welding current of 100 A. [ABSTRACT FROM AUTHOR]

Copyright of Revista Fuentes, El Reventón Energético is the property of Universidad Industrial de Santander and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)