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Rese a: Elogio del texto digital, de José Manuel Lucía Megías
Sheila Lucas Lastra
Caracteres : Estudios Culturales y Críticos de la Esfera Digital , 2012,
Abstract: Review of the book "Elogio del texto digital" written by José Manuel Lucía Megías.
A Comparison Of Liberation Determinations By Particle Area Percentage And Exposed Particle Perimeter Percentage In A Flotation Concentrator  [PDF]
R. Lastra
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2002, DOI: 10.4236/jmmce.2002.11003
Abstract: To simplify programming, image analyzers commonly measure either linear intercepts or the areas of particles and grains to determine liberation based on polished section mounts. However, the concentration of minerals by flotation is based on reagents that interact with the exposed surfaces of the minerals. Thus, it is often perceived that image analyzers should measure the perimeter of the mineral of interest in the ore particles. A comparative liberation study of thirteen samples collected from a flotation plant processing a complex base metal sulfide ore showed that the liberation of the ore minerals determined by area measurements is very similar to the liberation determined by the exposed perimeters. The liberation determined by exposed perimeters is more appropriate only for those cases where the mineral texture is so complex that it is retained in the small particles generated in conventional grinding operations.
"Todo mundo conhece a gente agora": cultura e identidade de jovens rurais em Minas Gerais (Brasil)
Magno,Lucas; Doula,Sheila Maria; de Almeida Pinto,Neide Maria;
Revista Latinoamericana de Ciencias Sociales, Ni?ez y Juventud , 2011,
Abstract: the objective of this paper is to analyze the construction of identities among young people in a rural neighborhood in vi?osa (in minas gerais, a state in brazil) from the social representation that they do with the musical percussion art project "tambores do buieié" (drums of buieié) and check how they (re) signify the culture as a response to the stigma that urban society has built in relation to that community. in this research it was used as methodology the non-participant observation and interviews with a structured script. the neighborhood of buieié has a former slave's descendant population living in precarious conditions, what leads the townspeople to build an identity on them based on preconceived categories associated with the location, which turns out to settle a conflicting identity to the one the buieié residents themselves elaborate about them. the cultural project stands as an alternative for young people to the (re)construction and valorization of territorial identity from alterity.
Mineralogical Characterization of Sieved and Un-Sieved Samples  [PDF]
Rolando Lastra, William Petruk
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2014, DOI: 10.4236/jmmce.2014.21007
Abstract: Mineralogical characterization applied to mineral processing is now widespread. The first step for a mineralogi- cal characterization study is usually size fractionation. Preparation of polished sections is done on size fractions to reduce complications in making representative cross sections of particles with large size differences. A sample is commonly fractionated into five or six size intervals. The drawback of this procedure is that it makes liberation studies more expensive, because one sample actually produces five or six sub-samples that need to be studied, i.e. one from each size interval. Thus to reduce cost of liberation studies, it would be desirable to study the un-sized sample. This paper provides a comparative liberation study of a set of samples both using size fractions and using the un-sized samples. The samples studied are the feed, the concentrate and the tails of a lead rougher flotation circuit. The results consistently show significant differences between the sized and the un-sized samples. Nevertheless, the results indicate that un-corrected liberation data from un-sized samples can be used for comparative studies that involve several related samples. Thus, it is possible to improve (or further understand) a concentrator circuit by using mineralogical data from un-sized samples around such circuit.
Comentario legislativo del 9542 Real Decreto-Ley 10/2010, de 16 de junio, de medidas urgentes para la reforma del mercado de trabajo
José Manuel LASTRA LASTRA
Boletín mexicano de derecho comparado , 2011,
Abstract:
La libertad sindical
José Manuel Lastra Lastra
Boletín mexicano de derecho comparado , 2000,
Abstract:
La libertad individual y colectiva del trabajo en pugna con la Constitución?
José Manuel Lastra Lastra
Boletín mexicano de derecho comparado , 2002,
Abstract:
RESE A DE "HOMO JURIDICUS. ENSAYO SOBRE LA FUNCIóN ANTROPOLóGICA DEL DERECHO" DE SUPIOT, Alain
José Manuel LASTRA LASTRA
Boletín mexicano de derecho comparado , 2012,
Abstract: ...
El trabajo en México
José Manuel Lastra Lastra
Boletín mexicano de derecho comparado , 2001,
Abstract:
Rese a de "El despido o la violencia del poder privado" de BAYLOS GRAU, Antonio y PéREZ REY, Joaquín
José Manuel LASTRA LASTRA
Boletín mexicano de derecho comparado , 2011,
Abstract:
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