electrical conductivity Articles
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Electrical conductance in a typical linear and cyclic quantum wire
Theoretical studies on electrical conductance in nanostructures which consist of two semi-infinite leads separated by a typical molecular wire are carried out within Green's function (GF) formalism in the linear regime. For this reason, the GF of extended molecular wire is obtained. Hence, the electrical conductance of the system is derived theoretically, using the GF elements and wire ...
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Conducting core-sheath polyurethane-PEDOT nanofibres for conducting polymer actuator
Conducting core-sheath nanofibres were prepared by the vapour-phase polymerisation of poly(3,4-ethylenedioxy thiophene) (PEDOT) on electrospun polyurethane (PU) nanofibres both with and without incorporating graphene nanoplatelets (GNPs) as the core part. The morphology, mechanical properties, electrical conductivity, and electroactive actuation of the core-sheath nanofibres were investigated. ...
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Synthesis and characterisation of electrical conducting nanoporous carbon structures based on pyrogallol-formaldehyde
Electrical conducting carbon (ECC) nanoporous structures were explored by changing the pyrolysis temperature of organic xerogel compounds prepared by sol-gel method from pyrogallol-formaldehyde (PF) mixture in water using picric acid as catalyst. The effect of these preparation parameters on the structural and electrical properties of the obtained ECCs was studied. The obtained results revealed ...
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Electrical conductivity as a state indicator for the start-up period of anaerobic fixed-bed reactors
The aim of this work was to analyse the applicability of electrical conductivity sensors for on-line monitoring the start-up period of an anaerobic fixed-bed reactor. The evolution of bicarbonate concentration and methane production rate was analysed. Strong linear relationships between electrical conductivity and both bicarbonate concentration and methane production rate were observed. ...
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Electrical properties of biogenic material: bilirubin rich gallstone
The electrical properties of Bilirubin Rich Gallstone (BGS) were investigated by the Complex Impedance Spectroscopy (CIS) technique. The dielectric relaxation was found to be of non-Debye type. Evidences of temperature-dependent electrical relaxation phenomena as well as Negative Temperature Coefficient of Resistance (NTCR) character of the sample have been observed. The ac conductivity obeys the ...
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Quantum chemical modelling of Al-doped PZT crystals
Complete analysis of the electronic and structural changes of the lead zirconate titanate (PZT) crystal due to aluminium impurity doping is done based on the computationally obtained results. The PZT is modelled at a concentration of the morphotropic phase boundary with the stoichiometry equal to PbZr0.53Ti0.47O3 and the chosen concentration of Al impurity is about 1.5%. A spontaneous occurrence ...
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Extraordinary electron and phonon transport through metal-semiconductor hybrid nanocomposite: decoupling electrical and thermal conductivities for thermoelectric application
We report a simple method involving mechanical attrition followed by hot press sintering to fabricate tablet samples consisting of silver nanoparticles (Ag NPs) dispersed in luminescent silicon nanocrystal (Si NC) matrix. A dramatic increase in current by almost six orders of magnitude is observed for this type of Si NC-Ag NP hybrid nanocomposite compared with bare Si NC-based tablets. Collective ...
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Development of Pd-coated ceramic electrodes in hybrid sulphur cycle
The Hybrid Sulphur (HyS) cycle has attracted much attention as a mass production process for hydrogen. It consists of an electrolysis step and a thermal decomposition one. In order to achieve high efficiency for hydrogen production and operational cost reduction, some developments in electrode materials with high corrosion resistance, high electrical conductivity and low anodic potential is a key ...
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Conductivity Theory and Measurement
Electrical conductivity is a measure of the ability of a solution to cany* a current. Current flow in liquids differs from mat in metal conductors in that electrons cannot flow freely, but must be carried by ions. Ions are formed when a solid such as salt is dissolved in a liquid to form electrical components having opposite electrical charges. For example, sodium chloride separates to form Na" ...
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Electrical and thermal transport properties of magnetically aligned multi-walled carbon nanotubes spray coated on copper substrates
A magnetic field was applied to multi-walled carbon nanotubes (MWNTs) decorated with Fe 3 O 4 nanoparticles while being spray coated on copper substrates to obtain a preferred orientation. The Fe 3 O 4 -MWNTs hybrid materials were aligned vertical or horizontal on the copper substrate and their electrical and thermal transport properties were investigated. The electrical and thermal ...
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Determining Bentonite Content in Soil-Bentonite Mixtures Using Electrical Conductivity
A procedure based on electrical conductivity is described for measuring bentonite content in soil-bentonite mixtures having a wide range of bentonite contents. Standard equipment used for sedimentation analysis and an electrical conductivity meter are required. The procedure employs calibration curves relating electrical conductivity and bentonite concentration for soil-bentonite-water slurries. ...
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Defects in titanates
Electronic, structural and optical properties of titanates (BaTiO3, SrTiO3, CaTiO3 and PbTiO3) containing different point defects are reviewed and discussed in the present work. The results are obtained using a quantum-chemical method based on the Hartree-Fock formalism and utilising the Large Unit Cell (LUC) and the Embedded Molecular Cluster (EMC) models. The outcomes of the computations are ...
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Groundwater quality modeling using neuro-particle swarm optimization and neuro-differential evolution techniques
Recently, the capabilities of artificial neural networks (ANNs) in simulating dynamic systems have been proven. However, the common training algorithms of ANNs (e.g., back-propagation and gradient algorithms) are featured with specific drawbacks in terms of slow convergence and probable entrapment in local minima. Alternatively, novel training techniques, e.g., particle swarm optimization ...
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Researchers Improve Electrical Conductivity of Conductive Coating Materials
Researchers at the Massachusetts Institute of Technology (MIT) have further enhanced a transparent and conductive coating material by increasing its electrical conductivity by 10 times. Illustration shows the apparatus used to create a thin layer of a transparent, electrically conductive material, to protect solar cells or other devices. The chemicals used to produce the layer, shown in tubes ...
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Thermal management of micro hotspots in electric components with carbon nanotubes
The excellent thermal and electrical conductivity as well as the remarkable mechanical properties of Carbon Nanotubes (CNTs) all point towards an unbeatable and facile route towards replacing traditional thermal management materials, like copper, in the electronics industry. In spite of that, the technology is still suffering from considerable challenges. In order to realise an actual ...
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Dielectrophoresis as a tool for nanoscale DNA manipulation
The use of the dielectrophoresis as a tool for DNA manipulation is demonstrated experimentally, using both unmodified 48,500 base pairs long bacteriophage lambda dsDNA (λ-DNA), ∼16 μm in length and 414 base pairs long thiol modified natural dsDNA (avDNA), ∼140 nm in length. We show that both the dsDNA types used, are effectively directed between the planar gold electrodes by the positive ...
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VMS and Ni-Cu case study Orion Minerals
This case study illustrates the use of an exploration method that leverages modern exploration techniques for deep-seated VMS and Ni-Cu deposits in a 978 km2 survey area in the highly prospective Areachap Belt, South Africa. The exploration method comprises the use of a high power helicopter TEM (“HTEM”) system, a large fixed loop TEM (“FLTEM”) ground system and ...
By SkyTEM ApS
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Operation Principle of Eddy Current Separator
Operation Principle of Jiarun Eddy Current Separator Eddy current separators have a conveying belt with a rapidly rotating magnetic rotor in the drum. The high rotation speed of the magnets generates an induction field, producing a quickly alternating magnetic field. The separation is based on the principle that every electrically conductive particle located in an alternating magnetic field ...
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Grounding Conductor
COPPER-CLAD STEEL GROUNDING CONDUCTORS Copper-clad copperweld steel grounding material is a new material developed by Ningbo Zhenhai Beisuda Petrochemical Equipment Co.,Ltd. to replace pure copper. Copper-clad copperweld steel grounding conductors has the following advantages: With high strength With low price High corrosion resistance High electrical conductivity of copper APPLICATIONS OF CCS ...
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Relationship of aquatic environmental factors with the abundance of
Vibrio cholerae, Vibrio parahaemolyticus, Vibrio mimicus andVibrio vulnificus in the coastal area of Guaymas, Sonora, MexicoMembers of the genus Vibrio are common in aquatic environments. Among them are V. cholerae, V. vulnificus, V. parahaemolyticus and V. mimicus. Several studies have shown that environmental factors, such as temperature, salinity, and dissolved oxygen, are involved in their epidemiology. Therefore, the main objective of this study is to determine if there is a correlation between the ...
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