نتایج جستجو برای: composite insulator
تعداد نتایج: 138742 فیلتر نتایج به سال:
bituminous emulsion insulators are types of bituminous emulsions groups composed of different grades of bitumen emulsified in water by bentonite and emulsifiers at 80-90oc. these emulsions are water resistant after drying andtheir physical and mechanical properties are superior in comparison to bitumen properties. iranian climate, because of variety and extreme variations in temperature imposes...
To be able to predict the DC flashover characteristics of composite insulators, a four-layer BP neural network model is established with insulator shed structure parameters as input. Three algorithms (gradient descent momentum, RMSProp gradient descent, and Adam descent) are applied, pollution experimental data insulators used training data. The results show that all three have good prediction ...
The effect of pressure on the metal–insulator transition in manganites with a broad range of bandwidths is investigated. A critical pressure is found at which the metal–insulator transition temperature, TMI , reaches a maximum value in every sample studied. The origin of this universal pressure and the relation between the pressure effect and the bandwidth on the metal–insulator transition are ...
The ground-state phase diagrams of the Falicov-Kimball model with local disorder are derived within the dynamical mean-field theory and using the geometrically averaged s“typical”d local density of states. Correlated metal, Mott insulator, and Anderson insulator phases are identified. The metal-insulator transitions are found to be continuous. The interaction and disorder compete with each othe...
In this Letter we construct a simple, controllable, two-dimensional model based on a topological band insulator. It has many attractive properties. (1) We obtain spin-charge separated solitons that are associated with dynamic pi fluxes. (2) These solitons obey Bose statistics and their condensation triggers a phase transition from a spin Hall insulator to an easy-plane ferromagnet. (3) It sugge...
Pollution flashover on insulators is one of the greatest challenges affecting smooth operation high-voltage transmission lines. Demonstrating super-hydrophobic coatings insulators’ interfaces an effective measure to prevent insulator flashovers. In present investigation, a FAS-17-modified SiO2/PDMS coating composite was demonstrated by spraying. The had contact angle 159.2° and sliding 1.3° wit...
Chromatin insulator elements and associated proteins have been proposed to partition eukaryotic genomes into sets of independently regulated domains. Here we test this hypothesis by quantitative genome-wide analysis of insulator protein binding to Drosophila chromatin. We find distinct combinatorial binding of insulator proteins to different classes of sites and uncover a novel type of insulato...
Recent data suggest that insulators organize chromatin architecture in the nucleus. The best studied Drosophila insulator proteins, dCTCF (a homolog of the vertebrate insulator protein CTCF) and Su(Hw), are DNA-binding zinc finger proteins. Different isoforms of the BTB-containing protein Mod(mdg4) interact with Su(Hw) and dCTCF. The CP190 protein is a cofactor for the dCTCF and Su(Hw) insulato...
Insulators are specialized DNA sequences that prevent enhancer-activated transcription only when interposed between an enhancer and its target promoter. The Drosophila gypsy retrotransposon contains an insulator composed of 12 degenerate binding sites for the Suppressor of Hairy-wing [Su(Hw)] protein that are separated by AT-rich DNA possessing sequence motifs common to matrix/scaffold attachme...
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