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article

Dielectric permittivity spectra of oil-water-saturated sandy-clayey rocks of different mineralogical compositions and relaxation properties of water in these rocks

P.P. Bobrov, V.L. Mironov, A.V. Repin, P.P. Bobrov, more

Russian Geology and Geophysics > 2015 > 56 > 7 > 1065-1073

Experimental measurements of the dielectric permittivity and equivalent conductivity of sandy-clayey samples (a mixture of river sand with bentonite or kaolin) saturated with salt-solution-diesel-fuel emulsions were performed in the frequency range from 10 kHz to 1 GHz at temperatures of 25-65 °C. It is shown that when the content of the salt solution in the saturating fluid does not exceed 10%, the...

article

Electrical Conductivity and Percolation Aspects of Statistically Homogeneous Porous Media

M. A. Ioannidis, M. J. Kwiecien, I. Chatzis

Transport in Porous Media > 1997 > 29 > 1 > 61-83

A method of 3-D stochastic reconstruction of porous media based on statistical information extracted from 2-D sections is evaluated with reference to the steady transport of electric current. Model microstructures conforming to measured and simulated pore space autocorrelation functions are generated and the formation factor is systematically determined by random walk simulation as a function of porosity...

article

Effect of applied pressure on microstructure and properties of hot‐pressed Ca‐doped LaCrO₃ ceramics

Zhengkun Cai, Minjin Jiang, Qianqian Guo, Xiaosong Jiang, more

International Journal of Applied Ceramic Technology > 18 > 3 > 684 - 696

High‐density chromium deficient calcium‐doped lanthanum chromite‐based ceramics (La_0.8Ca_0.2Cr_0.98O₃) were prepared by hot pressing (HP) at different sintering pressures, and the highest density can reach 98.8%. The effects of sintering pressure on the microstructure, mechanical properties, and electrical conductivity of La_0.8Ca_0.2Cr_0.98O₃ materials were studied. The experimental results show that...

article

A study on the fabrication and microwave shielding properties of PANI/C₆₀ heterostructures

Tengfei Lin, Haojie Yu, Li Wang, Qinghua Ma, more

Polymer Composites > 42 > 4 > 1961 - 1976

The in‐situ chemical oxidative polymerization was introduced to prepare the composites of polyaniline/fullerene (PANI/C₆₀) in this work. The effects of different reaction conditions such as the concentration of C₆₀, the concentration of doping acids, the concentration of aniline (ANI), and the reaction temperature were investigated. The composites were characterized by FTIR, scanning electron microscopy,...

article

High‐frequency electrical properties tomography at 9.4T as a novel contrast mechanism for brain tumors

Clémentine Lesbats, Nitish Katoch, Atul Singh Minhas, Arthur Taylor, more

Magnetic Resonance in Medicine > 86 > 1 > 382 - 392

Purpose To establish high‐frequency magnetic resonance electrical properties tomography (MREPT) as a novel contrast mechanism for the assessment of glioblastomas using a rat brain tumor model. Methods Six F98 intracranial tumor bearing rats were imaged longitudinally 8, 11 and 14 days after tumor cell inoculation. Conductivity and mean diffusivity maps were generated using MREPT and Diffusion Tensor...

article

A Mechanically Robust and Versatile Liquid‐Free Ionic Conductive Elastomer

Burebi Yiming, Ying Han, Zilong Han, Xinning Zhang, more

Advanced Materials > 33 > 11 > n/a - n/a

Soft ionic conductors, such as hydrogels and ionogels, have enabled stretchable and transparent ionotronics, but they suffer from key limitations inherent to the liquid components, which may leak and evaporate. Here, novel liquid‐free ionic conductive elastomers (ICE) that are copolymer networks hosting lithium cations and associated anions via lithium bonds and hydrogen bonds are demonstrated, such...

article

Properties and road engineering application of carbon fiber modified‐electrically conductive concrete

Shuhua Liu, Yuchuan Ge, Meiqiang Wu, Henglin Xiao, more

Structural Concrete > 22 > 1 > 410 - 421

In order to solve the impact of road ice and snow on traffic, carbon fiber modified‐electrically conductive concrete (ECON) was prepared in the laboratory and applied in road engineering. The workability, mechanical properties, electrical conductivity and electro‐thermal effect of ECON were investigated. The microstructure was analyzed by scanning electron microscope. The results show that ECON with...

article

Interaction of metformin hydrochloride with ionic surfactants in aqueous and NaCl solution: Effect of temperatures and compositions

Md. Anamul Hoque, Md. Masud Alam, Mohammed Abdullah Khan, Dileep Kumar, more

Journal of Physical Organic Chemistry > 34 > 4 > n/a - n/a

Herein, the interaction of metformin hydrochloride (MNH) with cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) has been investigated by the conductometric technique in aqueous medium as well as in the existence of NaCl over a range of temperatures. MNH, an antidiabetic drug that belongs to the biguanide group, is generally prescribed for the patients to manage type II diabetes...

article

SDC‐SCFZ dual‐phase ceramics: Structure, electrical conductivity, thermal expansion, and O₂ permeability

Claudia Li, Jian Song, Shude Zhang, Xiaoyao Tan, more

Journal of the American Ceramic Society > 104 > 5 > 2268 - 2284

New CO₂‐resistant dual‐phase Sm_0.2Ce_0.8O_1.925–SrCo_0.4Fe_0.55Zr_0.05O_3‐δ (SDC‐SCFZ) ceramics present a promising outlook for potential future applications in membrane reactors and solid oxide fuel cells. Their high oxygen permeation flux and stability in CO₂ sweep gas also allow their integration in oxyfuel combustion. Here the structural characteristics, electrical conductivities, thermal expansion...

article

Frequency domain electromagnetic induction: an efficient method for investigating Fort Ancient village dynamics

Claiborne D. Sea, Eileen G. Ernenwein

Archaeological Prospection > 28 > 1 > 73 - 87

Electromagnetic induction (EMI) has been used in archaeology for decades, but still lags in use and development when compared to magnetometry and ground‐penetrating radar. While it has become more popular than electrical resistivity area survey, it is now less commonly used than electrical resistivity tomography. The EMI method is likely underutilized due to drift problems and a lack of multi‐sensor,...

article

Comprehensive performance characterization of conductive fabric made of reduced graphene oxide (rGO)

Özgü Özen, Kerim Yapıcı, Demet Yılmaz

Journal of Applied Polymer Science > 138 > 22 > n/a - n/a

In this study, the production and comprehensive characterization of graphene based electrically conductive textile products, which will allow lower processing costs, such as, low temperature and short process times, and known textile production processes without losing their flexibility, lightness, permeability, and washability characteristics of textile products. Reduced graphene oxide (rGO) was...

article

Viability of Low Molecular Weight Lignin in Developing Thiol‐Ene Polymer Electrolytes with Balanced Thermomechanical and Conductive Properties

Elyse A. Baroncini, Dominique M. Rousseau, Christopher A. Strekis, Joseph F. Stanzione

Macromolecular Rapid Communications > 42 > 3 > n/a - n/a

Polymer electrolytes with high aromatic content are prepared through thiol‐ene polymerization with functionalized, low molecular weight fractions of softwood pine Kraft lignin, and wheat straw/Sarkanda grass soda lignin. Differing solubility, functionality, and aromatic content of the lignin fractions vary the glass transition temperatures of the resulting polymers and the suitability for electrolyte...

article

On the Crystal Structure and Conductivity of Na₃P

Henrik Eickhoff, Christian Dietrich, Wilhelm Klein, Wolfgang. G. Zeier, more

Zeitschrift für anorganische und allgemeine Chemie > 647 > 2-3 > 28 - 33

As a potential material for Na‐ion battery systems and on the basis of a structural discussion of compounds formerly believed to crystallize in the so‐called Na₃As type the structure of Na₃P has been reinvestigated. Na₃P is found to crystallize in the Cu₃P type, analogous to Na₃As and is described by a three times larger unit cell [P6₃cm, a = 8.61224(10) Å and c = 8.81949(10) Å] compared to the former...

article

Evaluation of conductivity‐based osmolality measurement in urine using the Sysmex UF5000

Dong‐Won Yoo, Sun Min Lee, Soo Young Moon, In‐Suk Kim, more

Journal of Clinical Laboratory Analysis > 35 > 1 > n/a - n/a

Background Automated flow cytometry‐based urine analyzer is increasingly being used to identify and enumerate cells and particles in urine specimens. It measures electrical conductivity which could be transformed to osmolality. Using this machine, all urine specimens could be screened for osmolality without requiring a separate dedicated device. We evaluated the performance of the new instrument,...

article

Was machen die Ionen in einem Elektrolyten? – Der Leitfähigkeit im Experiment auf der Spur

Dennis Lüke, Dominik Quarthal, Marco Oetken

CHEMKON > 28 > 1 > 35 - 39

Obwohl die Leitfähigkeit Schülerinnen und Schülern bereits im Anfangsunterricht begegnet, zeigen Untersuchungen, dass selbst nach dem Unterrichten der Elektrochemie Unsicherheiten dahingehend herrschen, welche Rolle Ionen in wässrigen Lösungen zukommt, wenn elektrischer Strom fließt. Zahlreiche Lernende sind sich der Ionenbewegung in Elektrolyten nicht bewusst und gehen vielmehr von Mechanismen aus,...

article

An impedimetric assay for the identification of abnormal mitochondrial dynamics in living cells

Kalpani N. U. Galpayage Dona, E Du, Jianning Wei

ELECTROPHORESIS > 42 > 1-2 > 163 - 170

Mitochondrial dynamics (fission and fusion) plays an important role in cell functions. Disruption in mitochondrial dynamics has been associated with diseases such as neurobiological disorders and cardiovascular diseases. Analysis of mitochondrial fission/fusion has been mostly achieved through direct visualization of the fission/fusion events in live‐cell imaging of fluorescently labeled mitochondria...

article

A Fourier‐based machine learning technique with application in engineering

Michaël Peigney

International Journal for Numerical Methods in Engineering > 122 > 3 > 866 - 897

The generic problem in supervised machine learning is to learn a function f from a collection of samples, with the objective of predicting the value taken by f for any given input. In effect, the learning procedure consists in constructing an explicit function that approximates f in some sense. In this article is introduced a Fourier‐based machine learning method which could be an alternative or a...

article

Selected Quality Indicators of Surface Waters of the Czestochowa City and Neighbouring Municipalities

Joanna Kończyk

Ecological Engineering & Environmental Technology > 2021 > Vol. 22, iss. 1 > 100--108

The surface water quality significantly affects the purity level of groundwater drawn for the municipal purposes. The pollution presence in surface waters is fundamentally the effect of the anthropogenic activity in a particular area while the type and volume of pollution depend closely on the intensity of any such activity. The paper presents the results of types of selected quality indicators of...

article

Configuration‐based electrical properties tomography

Santhosh Iyyakkunnel, Jessica Schäper, Oliver Bieri

Magnetic Resonance in Medicine > 85 > 4 > 1855 - 1864

Purpose To introduce phase‐based conductivity mapping from a configuration space analysis. Methods The frequency response function of balanced SSFP (bSSFP) is used to perform a configuration space analysis. It is shown that the transceive phase for conductivity mapping can be directly obtained by a simple fast Fourier transform of a series of phase‐cycled bSSFP scans. For validation, transceive...

article

Filler‐dependent changes in thermal, dielectric, and mechanical properties of epoxy resin nanocomposites

Emiri Nagase, Tomonori Iizuka, Kohei Tatsumi, Naoshi Hirai, more

IEEJ Transactions on Electrical and Electronic Engineering > 16 > 1 > 15 - 20

We added nanofillers of MgO, Mg(OH)₂, SiO₂, and TiO₂ to epoxy resin by high‐pressure shearing at a content of 1 vol%. The glass transition temperature (T_g), dielectric properties, and mechanical properties were measured for these nanocomposites. As a result, T_g decreases in all the nanocomposites. When the filler is MgO or Mg(OH)₂, the increase of the real part (ϵ_r′) and that of the imaginary part...

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Search results

Dielectric permittivity spectra of oil-water-saturated sandy-clayey rocks of different mineralogical compositions and relaxation properties of water in these rocks

Electrical Conductivity and Percolation Aspects of Statistically Homogeneous Porous Media

Effect of applied pressure on microstructure and properties of hot‐pressed Ca‐doped LaCrO₃ ceramics

A study on the fabrication and microwave shielding properties of PANI/C₆₀ heterostructures

High‐frequency electrical properties tomography at 9.4T as a novel contrast mechanism for brain tumors

A Mechanically Robust and Versatile Liquid‐Free Ionic Conductive Elastomer

Properties and road engineering application of carbon fiber modified‐electrically conductive concrete

Interaction of metformin hydrochloride with ionic surfactants in aqueous and NaCl solution: Effect of temperatures and compositions

SDC‐SCFZ dual‐phase ceramics: Structure, electrical conductivity, thermal expansion, and O₂ permeability

Frequency domain electromagnetic induction: an efficient method for investigating Fort Ancient village dynamics

Comprehensive performance characterization of conductive fabric made of reduced graphene oxide (rGO)

Viability of Low Molecular Weight Lignin in Developing Thiol‐Ene Polymer Electrolytes with Balanced Thermomechanical and Conductive Properties

On the Crystal Structure and Conductivity of Na₃P

Evaluation of conductivity‐based osmolality measurement in urine using the Sysmex UF5000

Was machen die Ionen in einem Elektrolyten? – Der Leitfähigkeit im Experiment auf der Spur

An impedimetric assay for the identification of abnormal mitochondrial dynamics in living cells

A Fourier‐based machine learning technique with application in engineering

Selected Quality Indicators of Surface Waters of the Czestochowa City and Neighbouring Municipalities

Configuration‐based electrical properties tomography

Filler‐dependent changes in thermal, dielectric, and mechanical properties of epoxy resin nanocomposites

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