scholarly journals Laboratory evaluation of soil geotechnical properties via electrical conductivity

Author(s):  
Fatima Zohra-Hadjadj ◽  
Nadia Laredj ◽  
Mustapha Maliki ◽  
Hanifi Missoum ◽  
Karim Bendani

In recent years, the use of electrical methods has been improved considerably in several areas such as environment, agronomy, geophysics and geotechnics. Electrical resistivity may be used as a parameter in soil characterization; it may have many advantages for the determination of geotechnical factors influencing the behavior of soil. In this research, laboratory tests were carried out on natural sodic soil from the region of Ain Nouissy (Mostaganem) to investigate the geotechnical and chemical behavior of a natural soil using electrical resistivity measurements under various conditions. This study aims therefore to identify relationships between electrical resistivity of the soil and some physical and chemical parameters such as water content, porosity, salt concentration and pH. Moreover, electrical resistivity has been measured with the addition of salts into the natural soil. The results show that electrical resistivity reduced drastically with the addition of salt. The obtained results will be used to evaluate properties needed for soil characterization, as well as to track soil behavior with respect to salt concentration for use in soil remediation.

2018 ◽  
Vol 34 (4) ◽  
pp. 1774-1778
Author(s):  
Adem Dreshaj ◽  
Bedri Millaku

This paper aims to reach clear conclusions and conclusions about the importance of management in increasing water quality, monitoring wind, taste and color, and so on. . Studies have been carried out in Radoniq Lake, monitoring physical and chemical parameters as well as heavy metals. Research results have been successful since we have managed to come up with concrete results and conclusions about what it is aimed at. Normally, heavy metals are defined in some locations such as : H-1, H-2, H-3, H-4, H-5 (Fe, Mn, Al, NO 3, NO 2, NH 4+). So the management of water resources has an irrefutable importance in achieving the desired performance on the market, which has also been proven by scientific research, the results of which will appear in some cases exceed international standards.


Tribologia ◽  
2018 ◽  
Vol 282 (6) ◽  
pp. 131-136 ◽  
Author(s):  
Dawid ROMEK ◽  
Jarosław SELECH ◽  
Rafał MACIASZEK

The paper presents quantitative results of mass wear of plough chisels working in soil made of various steel types and subjected to pad welding. The research was carried out in real field conditions on soils with similar physical and chemical parameters during routine field work in autumn. The scope of the research included the quantitative determination of wear values depending on the type of steel used and the surface treatment carried out. The photographs also show the surface profiles of plough chisels exposed directly to the impact of abrasives.


1989 ◽  
Vol 157 ◽  
Author(s):  
Harry A. Atwater ◽  
Jeffrey A. West ◽  
Patrick M. Smith ◽  
M.J. Aziz ◽  
J.Y. Tsao ◽  
...  

ABSTRACTWe have performed nanosecond-resolution measurements of the lateral electrical resistivity of thin metal films on insulating substrates. Comparison of transient resistivity measurements with optical reflectivity measurements and heat-flow calculations permits the determination of the position and velocity of a planar crystal/melt interface, and an estimate of undercooling during pulsed laser melting of metals. We report detailed results for rapid solidification of Ni, including the observation of hypercooling of .liquid Ni.


2015 ◽  
Vol 54 (4) ◽  
Author(s):  
César Augusto Moreira ◽  
Thais Munhoz ◽  
Fernanda Cavallari ◽  
Lívia Portes Innocenti Helene

Biogas produced in sanitary landfills consists in a potential source, formed by degradation of organic matter, this gas is constituted by CH4, CO2 and water vapor. Sanitary landfills represent important depository of organic matter with great energetic potential in Brazil, although presently with inexpressive use. Estimates for production or maintenance of productive rates of CH4 represent one of the main difficulties of technical order to the planning and continuity of collection systems for rational consumption of this resource. Electrical resistivity measurements are routinuously used in profiling oil wells for the determination of levels with accumulations of oil and gas, facing the contrast among fluids and rocks. This paper aims to evaluate eventual relationship among biogas flow quantified in surface drains of a waste cell in landfill, with characteristic patterns of in depth electrical resistivity. The integration of Electrical Resistivity Tomography (ERT) lines allowed for the generation of 3D blocks and a clear distinction among zones of high biogas production, quantified in surface drains, with areas of high resistivity in depth. The results suggest the possibility of use of the method in studies to place drains in areas promising to the collection of biogas for energetic generation in sanitary landfill.


2021 ◽  
Vol 7 (1) ◽  
pp. 5475-5488
Author(s):  
Maria Lucia Teixeira Guerra de Mendonça ◽  
Rosana Petinatti da Cruz ◽  
Jose Marcus Godoy ◽  
Antônio José Teixeira Guerra ◽  
Maria do Carmo Oliveira Jorge

Author(s):  
Janine Patricia Melo Oliveira ◽  
José Crisóstomo da Silva Neto ◽  
Adriano Sant’Ana Silva ◽  
Saulo Soares da Silva ◽  
Adriana da Silva Santos

<p>Este trabalho tem como objetivo produzir um fermentado alcoólico proveniente do suco de laranja <em>(Citrus sinensis), </em>segundo processo adaptado das metodologias já existentes para obtenção de outros fermentados de fruta. O processo produtivo do fermentado de laranja e as analises referentes ao mesmo foram conduzidos no Laboratório de Operações Unitárias e Fenômeno de Transporte do Centro de Ciências e Tecnologia Agroalimentar da Universidade de Campina Grande – Campus Pombal - Pb. Com relação às etapas da adição dos insumos na confecção do fermentado, as mesmas não foram feitas na ordem descrita pela maioria das literaturas que se trabalham com fermentados alcoólicos, onde a ordem seguida foi: Extração do mosto, Preparação do Mosto: Sulfitação, Inoculação do Microrganismo e Nutrientes, Determinação do °Brix, Chaptalização,<strong> </strong>Fermentação Alcoólica, Decantação e Trasfegas, Clarificação, Filtração e o Envase. Constata-se pelo presente trabalho que o fermentado de laranja, mostrou-se aceitável tanto em relação aos parametros físico-químicos analisados para o mesmo, quanto para as carcteristicas sensoriais, tal como o sabor, aroma e aparência. Reforça-se, portanto, a idéia de agregação de valor a uma matéria-prima consideravelmente nutricional, por meio da confecção de um produto inovador.</p><p align="center"><strong><em>Production of alcoholic fermented orange</em></strong></p><p><strong>Abstract</strong><strong>: </strong>This work aims to produce an alcoholic fermented from orange juice (Citrus sinensis), second process adapted from existing methodologies for obtaining other fermented fruit. The production process of fermented orange and the same related analyzes were conducted at the Unit Operations Laboratory and Phenomenon Transport Science Center and Agrifood Technology, University of Campina Grande - Campus Pombal. - Pb Regarding the steps to add inputs in the manufacture of fermented, they were not made in the order described by most of the literature that working with alcoholic fermentation, where the order was then: the must extraction, preparation of Mosto: Sulphitation, inoculation of the micro-organism and nutrients, determination of ° Brix , Chaptalisation, alcoholic fermentation, decantation, and Racking, clarification, filtration and Filling. It appears in this work that fermented orange, proved acceptable both for physical and chemical parameters analyzed for the same, as for the sensory carcteristicas, such as flavor, aroma and appearance. , Up reinforces therefore the value-added idea of a raw material considerably nutrition through the production of an innovative product.</p>


2011 ◽  
Vol 50 (No. 8) ◽  
pp. 376-384 ◽  
Author(s):  
L. Vorlová ◽  
R. Karpíšková ◽  
I. Chabinioková ◽  
K. Kalábová ◽  
Z. Brázdová

&nbsp;The aim of this project was to determine the antimicrobial activity of honeys produced in the Czech Republic to some bacteria (Listeria monocytogenes, Staphylococcus aureus, Salmonella typhimurium and Escherichia coli). Another aim was to find out whether there are correlations between the antimicrobial activity of honeys and their physicochemical parameters. All honeys included in the study were directly obtained from beekeepers in Southern and Northern Moravia from the summer load of 2001. The project contains 20 honeys which were determined according to their conductivity as blossom (6), blends (10) and honeydew (4). The determination of physical and chemical parameters such as content of water, conductivity, pH, water activity, invertase and diastase activities was carried out in accordance with the methods described in Harmonised methods of the European Honey Commission. The determination of the antimicrobial activity of honey was done by the MIC (minimal inhibitory concentration) method. Statistically significant relations between the antimicrobial activity and the conductivity of honey (P &lt; 0.05), the diastase (P &lt; 0.05) and invertase (P &lt; 0.001) activities were found out in the observed physicochemical parameters. The study proved that honey produced in the Czech Republic is antimicrobially effective with the highest effect in honeydew honeys (P &lt; 0.01). &nbsp;


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