Materials Literature
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This paper describes work done recently to characterize and better understand propagation of PD signals in the VHF and UHF bands in GIS. While carrying out a routine CIGRE TF 15/33.03.05 UHF PD Sensitivity Verification Step 1 Laboratory Test procedure, RF transmission measurements were made on the same GIS set-up empl…
The switching dynamics of electrically driven insulator-to-metal transition (IMT) and metal-to-insulator transition (MIT) in vanadium dioxide are investigated. The transient response of time domain measurements are modeled using a domain based 2-D heterogeneous resistive network, taking into account local electronic p…
This paper describes a new and intriguing observation relating to partial discharges specifically those discharges which occur despite the absence of an applied voltage within chopped sequence. The discharge pulses, which are referred to as Partial Discharge Echoes, appeared in intervals where no voltage was being app…
In the near future, the aircrafts will become more compact and lighter, since hydraulic, pneumatic or mechanical systems will be replaced by electrical ones. The network voltage is expected to increase far above Paschen's minimum, thus increasing the risk of partial discharges. These discharges, also known as silent e…
The effects of natural microstructures on the wettability are investigated based on the systematic analysis on the contact angles and morphology of the leaf surfaces of four kinds of plants, Photinia serrulata, Ginkgo, Aloe vera and Hypericum monogynum. P. serrulata possesses the most wettable leaf surface due to the…
It is shown experimentally that the near-infrared femtosecond laser irradiation and subsequent thermal treatment of silver-containing silicate glasses result in the formation of luminescent silver molecular clusters (MCs) and silver nanoparticles (NPs). In glasses doped also with halides (mostly Br), the nonluminescen…
Abstract The influence of composition and temperature on the anode polarization and corrosion rate of pure Al and Al‐In anodic alloys in 8M NaON electrolyte has been investigated. High current density (more than 800 mA cm−2) and faradaic efficiency over 97% were observed for all investigated alloys at 60 °C. Lower tem…
We present a comprehensive study of the electrical properties of bulk polycrystalline BiFe0.5Mn0.5O3, a double perovskite synthesized in high-pressure and high-temperature conditions. BiFe0.5Mn0.5O3 shows an antiferromagnetic character with TN = 288 K overlapped with an intrinsic antiferroelectricity due to the Bi(3+)…
Coupled valence band dispersions and the quantum defect of excitons in Cu2O, Schöne, Florian, Krüger, Sjard-Ole, Grünwald, Peter, Aßmann, Marc, Heckötter, Julian, Thewes, Johannes, Stolz, Heinrich, Fröhlich, Dietmar, Bayer, Manfred, Scheel, Stefan
A detailed understanding of chemical and biological function and the mechanisms underlying the molecular activities ultimately requires atomic-resolution structural data. Diffraction-based techniques such as single-crystal X-ray crystallography, electron microscopy, and neutron diffraction are well established and the…
A self-powered sensitive ultraviolet photodetector based on epitaxial graphene on silicon carbide* , Huang, Jiao, Guo, Li-Wei, Lu, Wei, Zhang, Yong-Hui, Shi, Zhe, Jia, Yu-Ping, Li, Zhi-Lin, Yang, Jun-Wei, Chen, Hong-Xiang, Mei, Zeng-Xia, Chen, Xiao-Long
Nanoindentation experiments and simulations are carried out to estimate the elastic modulus of freely-suspended-multilayer graphene. However, due to the difficulty of clamping all layers of multilayer graphene in experiments, and to the ambiguity of imposing the clamped boundary conditions in numerical simulations, th…
Abstract The Biga Peninsula of NW Turkey is host to many kaolin and halloysite deposits with mineralization occurring at the intersections of fault zones in contact with Late Eocene-Miocene calc-alkaline volcanic rocks. Distinguishing between the relative overprinting of hypogene by supergene processes in these deposi…
The PLA-groundnut shell solution is electrospun to produce nanocomposite fibre. The spinneret containing the composite solution was placed 24.7 cm away from the aluminium collector, tilted at an angle of 30 °, and the solution flow rate kept at 1 mL/min. Groundnut Shell particle (GSP) weight fraction used was varied f…
An oil-in-water Pickering emulsion system stabilized by amphiphilic porous carbonaceous microspheres was prepared and successfully used in enzyme-catalyzed hydrolysis. The control of the emulsion droplet size and size distribution were investigated by adjusting the particle content and the dispersed phase volume fract…
ABSTRACT Revisited network theory to account for inelasticity1,2 was used to model behavior of amorphous and semicrystalline PET. Semicrystalline materials were obtained through cold crystallization of the amorphous one making the crystalline microstructure the only difference. The model considers microstructure at a…
This paper presents in-plane bismuth-telluride-based thermoelectric (TE) energy generators fabricated using metal-shadow and radio-frequency sputtering methods at room temperature. The TE energy generators consist of four couples of 300-nm-thick nanostructured Bi2Te3 (n-BT) and Bi0.5Sb1.5Te3 (p-BST) thin films used as…
Abstract Boron nitride nanosheets (BNNS) were first time successfully exfoliated from hexagonal boron nitride (h‐BN) in an ethanol‐sodium hydroxide media using a microwave irradiation method. This simple and low‐cost exfoliation method enabled the fast produce of high quality BNNS within 2 min. The average sheet thick…
The thermal barrier efficiency of two types of ceramic particle, glass flakes and aluminum titanate, dispersed on the surface of carbon-fiber epoxy composites, has been evaluated using a cone calorimeter at 35 and 50 kW/m2, in addition to temperature gradients through the samples’ thicknesses, measured by inserting th…
The elastoresistivity tensor mij,kl relates changes in resistivity to strains experienced by a material. As a fourth-rank tensor, it contains considerably more information about the material than the simpler (second-rank) resistivity tensor; in particular, for a tetragonal material, the B1g and B2g components of the e…