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Search Results: 1 - 10 of 17643 matches for " Helísa Naves Martins "
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Advances in the Treatment of Textile Effluents: A Review  [PDF]
Marco Antonio Covi Júnior, Andressa Graciele dos Santos, Elias de Paulo Silva, Guilherme Franqueiro Maimoni, Helísa Naves Martins, Maria Luiza de Moura Assis, Carmen Aparecida Cardoso Maia Camargo, Marcio Antonio Ferreira Camargo
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105549
The textile industry moves the economy of several countries, being of great importance for the internal market and also for the external market, but it is considered one of the industries that consume a greater volume of water in its productive process, being one of the largest producers of effluents. Effluents from the textile industries carry toxic, mutagenic and potentially carcinogenic substances, and are resistant to chemical and/or biological degradation, pre-venting traditional effluent treatment methodologies from removing significant quantities of these molecules, compromising the quality of receiving water bodies. The present work aims to demonstrate the conventional methodologies used in the treatment of effluents from textile industries and present new technologies discovered for this purpose and present a greater efficiency in the removal of the dyes used in the productive chain of these industries.
Aspectos conceituais do browsing na recupera??o da informa??o
Naves, Madalena Martins Lopes;
Ciência da Informa??o , 1998, DOI: 10.1590/S0100-19651998000300005
Abstract: concept of browsing and its importance in information retrieval. shelf access in libraries, its evolution, advantages and disadvantages to permit browsing. study of the process limited to information searching in bookshelves or computer displays that adopt subject classification. browsing on computer and automated systems that allow for it.
Simulated Coevolution in a Mutating Ecology
J. S. Sa' Martins
Quantitative Biology , 1999, DOI: 10.1103/PhysRevE.61.R2212
Abstract: The bit-string Penna Model is used to simulate the competition between an asexual parthenogenetic and a sexual population sharing the same environment. A new-born of either population can mutate and become a part of the other with some probability. In a stable environment the sexual population soon dies out. When an infestation by fastly mutating genetically coupled parasites is introduced however, sexual reproduction prevails, as predicted by the so-called Red Queen hypothesis for the evolution of sex.
Campos nativos e matas adjacentes da regi?o de Humaitá (AM): atributos diferenciais dos solos
Martins, Gilvan Coimbra;Ferreira, Mozart Martins;Curi, Nilton;Vitorino, Antonio Carlos Tadeu;Silva, Marx Leandro Naves;
Ciência e Agrotecnologia , 2006, DOI: 10.1590/S1413-70542006000200005
Abstract: at the south of amazonas state there are about 560,000 hectares of cerrado grassland which are mainly distributed in humaitá, lábrea and canutama counties. the region is not covered by continuous grasslands, but by various isolated units intermixed by forests. the primitive vegetation phases indicate peculiar environments, such as the hydric regimen, natural fertility and aeration of soil. so, this work has as objective to stablish some reasons for the environmental distinction between forest and native grassland at humaitá ( amazonas state ) region. for that, 10 soil profiles were morphologically observed and sampled, being 5 profiles under forest and 5 profiles under native cerrado grassland. the samples were collected at 0-20, 20-40, and 60-80 cm depth, through pits. the soils under native grassland and under forest have similar chemical and identical mineralogical attributes. the occurrence of soils with greater effective depth, better dreinage and higher volume of water storage, in association with a higher inclination of the plinthic horizon in the direction of the "igarapé" (narrow riverbank between two islands or between an island and the main land), increasing the water flow in this direction, favor the forest vegetation, while opposite conditions to these ones favor the native grassland vegetation.
Sérgio Gualberto Martins,Marx Leandro Naves Silva,Nilton Curi,Mozart Martins Ferreira
CERNE , 2002,
Abstract: This study aimed to evaluate the structural quality of a dystroferric Red Latosol (Oxisol) under four forest settlements at Federal University of Lavras campus. The studied forest settlements were: Pinus sp. (PP), Eucalyptus sp. (PE), Hevea brasiliensis (PHB), and native forest (PNF). The mean annual precipitation and temperature for the region are 1493 mm and 19.3°C, respectively. For each studied settlement, disturbed and undisturbed samples from 0-5 cm depth were collected. The studied physical attributes were: aggregates stability, expressed through geometric average diameter, porosity distribution, penetration resistance and permeability. The PNF revealed the highest permeability value (139 mm h-1), followed by PHB (57 mm h-1), PP and PE (40 mm h-1). The highest value for penetration resistance was verified for PP, followed by PE and PHB. The smallest value was presented by PNF. Through this study, it can be concluded that the physical attributes, permeability and soil resistance to penetration, utilized as indicators of soil structural quality, present good performance in distinguishing the effects proportionated by the introduction of fast growth species, contributing for the sustainable management of the studied soil.
El río minero: matagente, ladrón y fantasmal
Valero Helí
Maguaré , 2008,
Abstract: Desde una perspectiva émica, este artículo constituye una aproximación etnográfica al mundo de la explotación de esmeraldas en el occidente de Boyacá. Examina el complejo espectro de representaciones sociales asociadas al río Minero, cuyo carácter es el mismo de la zona y de sus gentes. El río Minero es un minero en efervescencia; reproduce los principios terribles de la lógica de la violencia y las economías extractivas en Colombia: es ladrón, es fantasmal y mata gente. Todas las narrativas que el autor explora redundan en el miedo, la fortuna, la desgracia, la riqueza y la crueldad. Así, de la mano de la experiencia de un visitante, concluye que la zona esmeraldera es el mismo infierno.
Multiplica??o de gemas axilares de Acacia mearnsii de wild. Sob diferentes meios de cultura
Disarz, Ruter;Martins Corder, Maísa Pimentel;
Revista árvore , 2009, DOI: 10.1590/S0100-67622009000400002
Abstract: the propagation of some superior black wattle individuals (acacia mearnsii de wild.) aiming the establishment of more productive, homogeneous forests, resistant to plagues and diseases, is in great need in our days. the objective of the present report is to find the best culture medium and analyze the use of activated charcoal in the in vitro multiplication of axillary buds of a. mearnsii. explants of in vitro germinated plants were inoculated in different culture media: b5, ms, sp and wpm. several concentrations of ms medium were tested: 1/4; 1/2; 3/4; 1/1 (original concentration); 5/4; 3/2; 7/4 and 2/1, with and without activated charcoal. it was used a randomized experimental design, with five, seven and four replicates, with four explants per replicate. the evaluations were performed after 30 days, through the counting of the numbers of leafs and axillary shoots and the presence of callus and chlorosis. among the media used in the original composition, the ms promoted the best multiplication of axillary shoots (3,7 buds/explants) on the thirtieth day of culture. among the ms medium macro-nutrient concentrations, the dilution to 3/4 of the original concentration with the addition of activated carbon promoted the best responses for the multiplication of black wattle axillary shoots (7,7 buds/explant) after 60 days of culture.
Edson Farias,Maria Eloísa Martins
Sociedade e Estado , 2009, DOI: 10.1590/s0102-69922009000300001
Asymmetry in hierarchy model of Bonabeau et al
D. Stauffer,J. S. Sa Martins
Physics , 2003,
Abstract: The 1995 model of Bonabeau et al. explains the emergence of social hierarchies through randomness, but gives as many leaders as followers. A simple modification allows a more realistic asymmetry with much less leaders.
Simulation of Galam's contrarian opinions
D. Stauffer,J. S. Sa Martins
Physics , 2003,
Abstract: Galam's model of people voting always against the majority is shown to give for the quenched case different results than the original annealed model. For people diffusing on a lattice, Galam's phase transitions happen only at higher concentrations of people.
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