Technological Characterization of Heavy Clay from the Caí River Valley in Brazil

2015 ◽  
Vol 64 (1-2) ◽  
pp. 14-19
Author(s):  
R. C. D. Cruz ◽  
C. A. Perottoni ◽  
J. E. Zorzi ◽  
J. V. Emiliano
Keyword(s):  
River Valley ◽  
Heavy Clay

Hydrodynamic and isotopic characterization of a site contaminated by chlorinated solvents: Chienti River Valley, Central Italy

2013 ◽  
Vol 32 ◽  
pp. 164-174 ◽  
Author(s):  
Marco Petitta ◽  
Eva Pacioni ◽  
Chiara Sbarbati ◽  
Gianni Corvatta ◽  
Marco Fanelli ◽  
...  
Keyword(s):  
Central Italy ◽  
Chlorinated Solvents ◽  
River Valley ◽  
Isotopic Characterization ◽  
A Site

scholarly journals Hydro-physical characterization of contrasting soils in a semiarid zone of the Ebro river valley (NE Spain)

2013 ◽  
Vol 486 ◽  
pp. 403-411 ◽  
Author(s):  
D. Moret-Fernández ◽  
C. Castañeda ◽  
E. Paracuellos ◽  
S. Jiménez ◽  
J. Herrero
Keyword(s):  
River Valley ◽  
Physical Characterization ◽  
Ebro River ◽  
Semiarid Zone ◽  
Ne Spain

scholarly journals Ceramic raw materials from the State of Maranhão, Brazil. Part 1: chemical and mineralogical characterization and technological properties of clays from São Luis, Rosário, Pinheiro and Mirinzal

2012 ◽  
Vol 65 (4) ◽  
pp. 513-521
Author(s):  
José Manuel Rivas Mercury ◽  
Gricirene Sousa Correia ◽  
Nazaré Socorro Lemos Silva Vasconcelos ◽  
Aluísio Alves Cabral Jr. ◽  
Rômulo Simões Angélica
Keyword(s):  
Raw Materials ◽  
Mineralogical Composition ◽  
Exchange Capacity ◽  
High Plasticity ◽  
X Ray Diffraction ◽  
Specific Mass ◽  
Mineralogical Characterization ◽  
Heat Treated ◽  
Heavy Clay

This work involved the characterization of clays collected in the municipalities of São Luis, Rosário, Pinheiro and Mirinzal (state of Maranhão, Brazil), based on specific mass, specific surface area, cation exchange capacity (CEC), particle size distribution, X-ray diffraction (XRD), differential thermal analysis (DTA), thermogravimetric analysis (TG-DTA) and Atterberg limits. Technological tests for ceramic applications were also carried out on compacts pressed under 20 MPa and heat-treated at 850, 950, 1050, 1150 and 1250ºC. Our results indicated that two of the clays composed of kaolinite, quartz, and anatase with high plasticity limits, have excellent properties and can be used in the whiteware industry. The other ones are red-firing clays and have a mineralogical composition of quartz, kaolin, feldspar, montmorillonite, hematite and goethite. The latter showed low and moderate values of plasticity, which makes them suitable for the production of heavy clay products.

Landscape Influences on Stream Habitats and Biological Assemblages

2006 ◽  
Keyword(s):  
Water Management ◽  
Prior Knowledge ◽  
Conservation Planning ◽  
Classification System ◽  
River Valley ◽  
Spatial Context ◽  
Home Ranges ◽  
Hydrologic Regime ◽  
Statewide Planning

<em>Abstract.</em>—–Describing the unique spatial context of any river unit requires integrating catchment and local valley characters. We believe that adding hydrologic regime and key fish species to standard geomorphic variables improves the delineation and characterization of river valley segments as ecological units. Valley segments constrain habitat units, and several segments together can encompass home ranges of mobile fishes. Segments can be accurately defined and characterized using maps and then analyzed across large geographic areas, making them practical for statewide planning and management. By incorporating prior knowledge from modeling landscape–river relationships, we interpreted multiple landscape maps to delineate and assign initial attributes to river valley segments. The resulting classification system provides a new, ecologically informed view of Michigan’s rivers that has helped managers better perceive and consider environmental patterns that constrain habitat and biological variation within and among individual rivers. It is being used throughout Michigan and regionally as a framework for fisheries and water management, conservation planning, and education.

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