scholarly journals CORRELATIVE AND COVARIANCE ANALYSIS OF THE ELECTROCONDUCTIVE FABRICS

2021 ◽  
Vol 2021 ◽  
pp. 300-307
Author(s):  
R.M. Aileni ◽  
L. Chiriac
Keyword(s):  
Electrical Resistance ◽  
Electromagnetic Waves ◽  
Surface Resistance ◽  
Air Permeability ◽  
Experimental Models ◽  
Covariance Analysis ◽  
Deposition Method ◽  
Polymeric Matrices ◽  
Conductive Materials ◽  
Scientific Approach

This paper presents the correlation and covariance analysis of the electrical resistance dependence of mass, thickness and air permeability of textile structures coated with magneto-conductive materials and used for protection against electromagnetic waves. For this scientific approach, 9 experimental models of compositesbased fabrics with electroconductive properties were made by applying different pastes based on organic polymeric matrices polyvinyl alcohol (PVA), copper (Cu), aluminium (Al), zinc (Zn), iron oxide (Fe3O4) and polypyrrole (PPY) solution using a classical deposition method such as scraping. The surface resistance was evaluated using a resistance meter device based on two parallel electrodes. From all samples analysed 5 samples based PPY, PVA-Ni, PVA–Ni-Al and PVA-Zn present a surface resistance between 103 and 105 Ω. Because the surface resistance has a lower value this means that the samples have a good conductivity to be used as layers for electromagnetic shielding systems.

scholarly journals The anisotropic structure of electro conductive leather studied by Van der Pauw method

2019 ◽  
Vol 2 (3) ◽  
pp. 136-144
Author(s):  
Aulon Shabani ◽  
Majlinda Hylli ◽  
Ilda Kazani ◽  
Pellumb Berberi ◽  
Orion Zavalani ◽  
...  
Keyword(s):  
Chemical Treatment ◽  
Electrical Resistance ◽  
Surface Resistance ◽  
Treatment Process ◽  
Electrode Placement ◽  
Conductive Materials ◽  
Measuring Surface ◽  
Van Der Pauw ◽  
Placement Technique ◽  
Van Der Pauw Method

Determining the surface resistance of electro conductive refined natural leather materials is in the focus of this paper. Natural leather samples are initially transformed to conductive by applying chemical treatment process known as polymerization. Due to the existence of various techniques for measuring electrical resistance of conductive materials, we are focused on measuring surface resistance by arranging four electrodes in the edges of square leather samples, also known as Van der Pauw method. Improving the results accuracy, we use a multi-variant electrode placement over the sample edges. The result is the average of all results gained for different placements. Moreover, we use this electrode placement technique to analyse the anisotropy of conductive samples. The results of this research provide important knowledge about leather chemical treatment and its electrical proprieties.

Surface Electrical Resistances Properties of CNF/PC Nano-Composite Processing by Injection Molding

2011 ◽  
Vol 339 ◽  
pp. 367-370 ◽  
Author(s):  
Jian Hui Qiu ◽  
Kengo Uchiya ◽  
Lei Lin ◽  
Xue Li Wu ◽  
Yang Zhao
Keyword(s):  
Surface Roughness ◽  
Injection Molding ◽  
Electrical Resistance ◽  
Surface Resistance ◽  
Carbon Nanofiber ◽  
High Surface ◽  
Material Surface ◽  
Nano Composite ◽  
Injection Speed ◽  
Surface Electrical Resistance

In the present work, carbon nanofibers (CNF) were dispersed into polycarbonate (PP) with an injection molding machine. The effect of the injection conditions on the electrical resistance of carbon nanofiber/polycarbonate (CNF/PC) nanocomposites was investigated. It was found that the surface resistance decreased with the increase of injection speed and injection temperature. The surface electrical resistance was affected by the particle size and dispersion of CNF, the effect of depth on surface resistance of the composites was studied, the surface electrical resistance sharply increased from the material surface to the internal at first, after that, a decreased slowly was observed. The effect of surface roughness on surface electrical resistance was also studied, the composite with a low surface resistance was greatly influenced when surface roughness changed, while there was not a same phenomenon when the composites have a high surface resistance.

Electromagnetic Shielding Effectiveness of Physical Property PET/Stainless Steel Composite Fabrics

2014 ◽  
Vol 910 ◽  
pp. 210-213 ◽  
Author(s):  
Jia Horng Lin ◽  
Ting An Lin ◽  
An Pang Chen ◽  
Ching Wen Lou
Keyword(s):  
Electromagnetic Waves ◽  
Physical Property ◽  
Electrical Equipment ◽  
Air Permeability ◽  
Woven Fabrics ◽  
Electromagnetic Shielding ◽  
Woven Fabric ◽  
Shielding Effectiveness ◽  
Composite Yarn ◽  
Electromagnetic Shielding Effectiveness

The electronic appliance is capable of emitting electromagnetic waves that will cause the damage of electrical equipment and influence peoples health. In this study, stain steel filament (SS filament) and 75D PET filament were used to manufacture SS/PET composite yarn The SS/PET composite yarn were made by the wrapping machine, which the core yarn is stain steel filament, wrapped yarn is 75D PET filament and the wrapping layers is varied as one and two. After that, the composite yarn is fabricated by the automatic sampling loom into composite woven fabrics. The composite SS/PET woven fabrics were under the tests of electromagnetic shielding effectiveness (EMSE) and air permeability. The test results revealed that the EMSE of the one-layer composite woven fabric is 9.5 dB at 900 MHz, but the EMSE decreases as test frequency increases. When laminating layer added to three layers, the EMSE raise up to 12.6 dB. The EMSE of composite woven fabric reached at 29.9 when the laminated angle is 45°. And the air permeability decreases as the laminate layer increases, which the thickness of sample affect air to pass through the sample.

Oleanolic acid causes reversible contraception in male mice by increasing the permeability of the germinal epithelium

2019 ◽  
Vol 31 (10) ◽  
pp. 1589 ◽  
Author(s):  
David Fisher ◽  
Faizel Mosaval ◽  
Darla L. Tharp ◽  
Doug K. Bowles ◽  
Ralf Henkel
Keyword(s):  
Oleanolic Acid ◽  
Sertoli Cells ◽  
Electrical Resistance ◽  
Experimental Models ◽  
Ethanol Solution ◽  
Germinal Epithelium ◽  
Control Group ◽  
Male Mice ◽  
Rt Pcr ◽  
Daily Dose

The effects of oleanolic acid (OA) on the fertility of male mice were investigated using both invivo and invitro experimental models. The experimental group (n=12) was treated with a daily dose of 30mgOAkg−1 bodyweight (i.p.), while the control group (n=6) received a daily dose of 10% ethanol solution (1mLkg−1 bodyweight). The effect of OA on the permeability status of TM4 Sertoli monolayers was investigated by measuring the transepithelial electrical resistance (TER), intracellular electrical resistance and semiquantitative RT–PCR. After 45 days, OA-treated males produced no pregnancies but in the control group, all 12 females were impregnated (69 offspring). Male mice, which demonstrated sterility when exposed to OA, recovered their fertility after 30 days (78 offspring). Testicular histological observations of OA-treated mice showed detachment of adjacent Sertoli–Sertoli cells. A control monolayer developed TER of 300–400 Ω.cm2, but OA (50, 100, 200µgL−1) treated monolayers developed TER of approximately 100Ω.cm2. Intracellular electrophysiological and RT–PCR data supported the premise that OA compromised tight junctional permeability. The study demonstrated reversible contraception in male mice by increasing the permeability of the germinal epithelium and further postulates that contraceptive reversibility is brought about by the reconstitution of the paracellular junctions between adjacent Sertoli cells.

Preparation of polypyrrole/polyester-cotton composites and a study of their dielectric properties and conductivity

2020 ◽  
pp. 004051752096569
Author(s):  
Yuanjun Liu ◽  
Yi Wang
Keyword(s):  
Dielectric Properties ◽  
Electromagnetic Waves ◽  
Surface Resistance ◽  
In Situ Polymerization ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Benzene Sulfonate ◽  
Frequency Range ◽  
Doping Agent ◽  
Dodecyl Benzene Sulfonate

Polypyrrole/polyester-cotton composites were prepared using pyrrole as the monomer, adopting an in situ polymerization on the plain polyester-cotton fabric. The influence of the pyrrole concentration, type and concentration of doping agents on the dielectric properties and conductivity of polypyrrole/polyester-cotton composites were investigated using the method of control variables. The results show that within the frequency range 0.01–1.0 GHz, and for concentrations of pyrrole monomers of 0.3, 0.6, 0.9, 1.2 and 1.5 mol/L, the polypyrrole/polyester-cotton composite had the strongest polarization ability, dissipation ability and absorbing-attenuation ability to electromagnetic waves, and the surface resistance was the smallest and conductivity was the best when the pyrrole concentration was 0.9 mol/L. Within the same frequency range, five doping agents were tested, namely sodium dodecyl benzene sulfonate, p-toluenesulfonic acid, ferric chloride, sodium lignosulfonate and camphor sulfonic acid. The composite with sodium dodecyl benzene sulfonate as the doping agent had the strongest polarization ability, dissipation ability and absorbing-attenuation ability to electromagnetic waves, the lowest surface resistance and the strongest conductivity. Finally, within the same frequency range and using doping agent concentrations of 0.1 and 0.2 mol/L, the composite with doping agent concentration of 0.1 mol/L had the strongest polarization ability, dissipation ability and absorbing-attenuation ability.

Exposing smart cities and eco-cities: Frankenstein urbanism and the sustainability challenges of the experimental city

2017 ◽  
Vol 50 (1) ◽  
pp. 73-92 ◽  
Author(s):  
Federico Cugurullo
Keyword(s):  
Urban Development ◽  
Smart City ◽  
Smart Cities ◽  
Experimental Models ◽  
Built Environments ◽  
Sustainable City ◽  
Incompatible Elements ◽  
The World ◽  
Scientific Approach ◽  
Sustainability Challenges

In recent years, the world has seen the emergence of a number of urban projects which, under the banner of experimentation, have promoted alternative models of city-making capable, in theory, of creating sustainable built environments. Among these supposedly experimental models, the smart city and the eco-city stand out in terms of geographical diffusion, and are hailed by their advocates as the mark of an innovative urbanism based on a scientific approach to urban development. Through the analysis of Hong Kong and Masdar City, examples of a smart-city agenda and an eco-city project respectively, this paper questions the sustainability of so-called smart cities and eco-cities, by investigating the extent to which they are developed in a controlled and systematic manner as their developers claim. More specifically, the paper counterclaims mainstream understandings of smart and ecological urbanism, arguing that what are promoted as cohesive settlements shaped by a homogeneous vision of the sustainable city, are actually fragmented cities made of disconnected and often incongruous pieces of urban fabric. Theoretically, these claims are discussed through the concept of Frankenstein urbanism which draws upon Mary Shelley’s novel as a metaphor for unsuccessful experiments generated by the forced union of different, incompatible elements.

scholarly journals Mapping Time-Dependent Conductivity of Metallic Nanowire Networks by Electrical Resistance Tomography toward Transparent Conductive Materials

2020 ◽  
Vol 3 (12) ◽  
pp. 11987-11997 ◽  
Author(s):  
Gianluca Milano ◽  
Alessandro Cultrera ◽  
Katarzyna Bejtka ◽  
Natascia De Leo ◽  
Luca Callegaro ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Time Dependent ◽  
Electrical Resistance Tomography ◽  
Conductive Materials ◽  
Metallic Nanowire Networks ◽  
Nanowire Networks
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