Fossil Wood
Mostrando 1-12 de 15 artigos, teses e dissertações.
-
1. AVALIAÇÃO QUÍMICA DE LENHOS CARBONIZADOS DE Araucaria columnaris SOB DIFERENTES CONCENTRAÇÕES DE OXIGÊNIO COMO COMPARATIVO DE ANÁLISE DE charcoal FÓSSIL
In the face of environmental changes concerns, the study of climate change becomes essential to understand the life trajectory of planet earth. For this purpose, this work seeks to understand climate change and fluctuations in the amount of atmospheric oxygen across geological ages, carbonizing the Araucaria columnaris wood in varying oxygen concentrations,
Quím. Nova. Publicado em: 2021-03
-
2. Manifestações simbólicas em Santa Elina, Mato Grosso, Brasil: representações rupestres, objetos e adornos desde o Pleistoceno ao Holoceno recente
Resumo Santa Elina, na Serra das Araras, no Mato Grosso, oferece uma notável composição de dois conjuntos arqueológicos excepcionais: a) um dispositivo parietal de um milhar de pinturas, adaptando-se estreitamente à morfologia do abrigo que se encontra ao pé de uma falésia calcária; b) um conjunto de ocupações distribuídas em duas sequências estr
Bol. Mus. Para. Emílio Goeldi. Ciênc. hum.. Publicado em: 26/08/2019
-
3. Changes of wood anatomical characters of selected species of Araucaria- during artificial charring - implications for palaeontology
ABSTRACT Charcoal is widely accepted as evidence of the occurrence of palaeo-wildfire. Although fossil charcoal remains have been used in many studies, investigation into the anatomical changes occurring during charring are few. The present study analyses changes in selected anatomical characters during artificial charring of modern wood of three species of
Acta Bot. Bras.. Publicado em: 27/11/2017
-
4. Química e sustentabilidade: novas fronteiras em biocombustíveis
This contribution discusses the state of the art and the challenges in producing biofuels, as well as the need to develop chemical conversion processes of CO2 in Brazil. Biofuels are sustainable alternatives to fossil fuels for providing energy, whilst minimizing the effects of CO2 emissions into the atmosphere. Ethanol from fermentation of simple sugars and
Quím. Nova. Publicado em: 2013
-
5. Caracterização de biomassas brasileiras para fins de aproveitamento energético / Characterization of brazilian biomasses for energy recovery
New energetic alternatives have been the subject of discussion about conservation of natural resources. Such discourses are based mainly on reducing emissions of greenhouse gases and other pollutants, caused mostly by the use of fossil fuels, major source of energy today. In view of the applicability of biomass as energy input, this paper presents an experim
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
-
6. Madeiras fósseis holocênicas de Ribeirão da Mata: anatomia ecológica, relações florísticas e interpretação paleoambiental da região arqueológica de Lagoa Santa, MG / Holocene fossil woods from Ribeirão da Mata: ecological wood anatomy, floristic relationships and paleoenvironmental interpretation of the archaeological region of Lagoa Santa, MG, Brazil
Esta tese foi concebida para se integrar ao eixo nº 5 (Paleoclimas e Paleoambientes no final do Peistoceno e Holoceno na região de Lagoa Santa) da terceira versão do projeto temático Origens e Microevolução do Homem na América: uma abordagem paleoantropológica (FAPESP proc. 04/01321-6), onde a principal questão abordada é a existência de um grande
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/04/2011
-
7. Isolamento e caracterização de leveduras fermentadoras de D-xilose, L-arabinose ou D-celobiose e produtoras de celulases e xilanases associadas à madeira em decomposição
Security of a sustainable energy supply providing alternatives to fossil fuels, and market demands are controlling parameters for developing new energy systems, being bioethanol a part of the solution to this problem. The aims of this study were to isolate, identify and characterize yeasts producing exoenzymes and capable of fermenting xylose, arabinose and/
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/08/2009
-
8. BARRAMENTOS NATURAIS NO VALE DO RIO PERUAÃU: CONSEQÃÃNCIAS ECOLÃGICAS E AMBIENTAIS DE EVENTOS PRETÃRITOS E FUTUROS. / Natural barring in the PeruaÃu River Valley: ecological and environmental consequences of past and future events.
Fossil assemblage found in caves record important environmental information concerning the recent past of the surrounding area. In the karstic canyon of the PeruaÃu River, Cavernas do PeruaÃu National Park, Minas Gerais - Brazil, organic deposits suggests the occurrence of major floods resulting from natural barring in the river bed. This dissertation soug
Publicado em: 2008
-
9. Tecnologia e economia do briquete de madeira / Technology and economy of the wood briquette
Este trabalho trata do perfil industrial e do mercado do briquete de madeira e da briquetagem sob duas áreas do conhecimento: a tecnologia do adensamento ligno-celulósico e a economia. O objetivo geral foi investigar as características técnicas e contábeis-gerenciais do briquete e do processo industrial para os fluxos de massa e de energia. Além disso,
Publicado em: 2008
-
10. Estudo tecnico-economico da compactação de residuos madeireiros para fins energeticos / Technical and economic study of wood residues compression for energy use
The main purpose of this work is to demonstrate the biomass compression processes for the substitution of traditional fuels such as wood and fossil fuels. It was performed a technical and economic feasibility analysis of the deployment of a wood residue compression plant with a yearly capacity of 2,112 tons of briquettes or pellets for energy use. Four diffe
Publicado em: 2007
-
11. Biopitch produced from eucalyptus wood pyrolysis liquids as a renewable binder for carbon electrode manufacture
Interest in biomass as a clean source of fuel, chemicals and materials is growing fast. What is attractive about biomass is its renewability and that it is CO2 balanced and sulfur-free. Biomass pyrolysis produces charcoal, bio-oil and gases in different proportions, depending on the technology and raw material used. In this study biopitch, a substitute for f
Brazilian Journal of Chemical Engineering. Publicado em: 2002-04
-
12. Spirochete and protist symbionts of a termite (Mastotermes electrodominicus) in Miocene amber
Extraordinary preservation in amber of the Miocene termite Mastotermes electrodominicus has led to the discovery of fossil symbiotic microbes. Spirochete bacteria and wood-digesting protists were identified in the intestinal tissue of the insect. Fossil wood (xylem: developing vessel-element cells, fibers, pit connections), protists (most likely xylophagic a
The National Academy of Sciences.