Materials Literature
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Understanding the initiation process of preliminary breakdown during negative CG lightning discharges to the ground is important to design a lightning protection system. We observed electric field change preceding negative cloud to ground lightning flashes related to preliminary breakdown in tropical region, Indonesia…
Zinc-air batteries, despite their advantages of high energy density, operational safety, economic and technical viability, are limited by the problem of electrolyte leakage. This study presents a study on this problem and its effects on the performance of a zinc air battery. To elucidate the cause(s) of leakage, the f…
Cold spraying has been effectively investigated for spraying of various metals, alloys and composites. Coating of bioceramics like Hydroxyapatite (HAP) using thermal spraying has been investigated extensively, but there is a dearth of research related with HAP deposition using cold spraying. The relative percentage co…
Fuel cycle tests using uranium and simulants with process equipment of 1 ton HM/yr throughput were conducted to develop an equipment design for long-term and hot-cell operation with stable performance, and to investigate the influence of impurities on the behavior of sensitive materials such as molten chlorides and ac…
Metal-Oxide arresters are used to protect substation's equipment against surges. Because their constructive properties, a small current, called leakage current, flows through them in normal operation condition. The resistive part of this current is a good indicator of the arrester's degradation state and is also respo…
The C—I bond dissociation enthalpies (BDE) of various organic iodides were calculated using high-level theoretical methods including MP2 and CCSD(T) with extrapolated basis set as well as a number of density functional theory methods. After systematic evaluation of the theoretical results against available experimenta…
Methylparaben (methyl p-hydroxybenzoic acid; MP) is a widely used antimicrobial preservative, being the most frequently used antimicrobial preservative in cosmetics. The generalized use of MP has become controversial, with several recent reports of dangerous side effects. For example, the presence of MP in human breas…
Light extraction efficiency (LEE) and internal quantum efficiency (IQE) of InGaN-based vertical blue light-emitting diode (LED) structures are investigated by numerical simulations and experiments. LEE of vertical LEDs is calculated for various structural and material parameters by using three-dimensional finite-diffe…
Cathodic arc evaporation CrN double layer coatings were deposited onto tool steels in two steps by industrial apparatus. Microblasting was performed on CrN first layer in order to remove metallic droplets and surface defects and to promote the adhesion of the second layer. Surface morphology effects were assessed by a…
The non-standard lightning impulse voltages have variable front time, duration time and may have high-frequency components superimposed on the waveforms due to the reflection in the substation and other factors. These surges can propagate to the transformer winding and may even lead to the breakdown of the winding ins…
Thermomechanical fatigue behavior of a nickel base single crystal superalloy TMS-82 has been investigated. It was found that the micropores in the alloy tend to initiate large amounts of deformation twins and the crack causes many twins to occur during its propagation. It is postulated that these twins around the micr…
This paper presents finite element investigation and experimental validation on the characteristics of unbalanced magnetic force (UMF) with static/rotating rotor eccentricities in permanent magnet machines having asymmetric windings. It shows that the magnitude of UMF due to eccentricity increases with the pole number…
As Networks-on-Chips (NoCs) continue to become more susceptible to process variation, cross-talk, hard and soft errors with technology scaling to sub-nanometer, there is an urgent need for adaptive Error Correction Coding (ECC) schemes for improving the resiliency of the system. The goal of adaptive ECC schemes should…
Owing to lack of soluble potassium resource in some countries, it will be the competitive alternative to obtain potassium from insoluble K-bearing minerals (e.g. K-feldspar, biotite) in order to satisfy the requirements of potassium fertilizers for the agricultural sustainable development. In this work, seven fungal s…
Excellent Silicon Carbide (SiC) material properties make SiC JFETs extremely attractive for high power density and high frequency power applications, as well as for circuit protection functions. The absence of a gate oxide and internal parasitic devices allows the device to operate especially well at high temperatures…
Hot Dip Zn-6Al-3Mg-0.2Si coating steel sheet was prepared in laboratory by Hot-dip Galvanizing Simulator produced by National Engineering Lab of Advanced Coating Technology for Metal Materials. The surface and cross sectional microstructure of the samples were analyzed by using SEM and EDS. Hot dip Zn coated, 55Al-43.…
The main purpose of this paper is to investigate the effect of bandgap, carrier concentration, minority carrier life time and CdZnTe absorber layer thickness on the thin film solar cell baseline case. The bandgap of Cd1-xZnxTe solar cells are tunable between 1.4SeV and 2.2eV (depends on the value of x). In this resear…
A novel frequency selective surface (FSS) is proposed in this paper. The FSS has four layers on both sides of two separate substrates with a distance 8 mm, which is much smaller than the wavelength. The FSS has wide bandwidth, ranging from 2.7 GHz to 13.2 GHz. The FSS cell for Electromagnetic Band Gap (EBG) is used as…
The Électricité de France nuclear park consists of 58 pressurized water nuclear reactors. To ensure their good performance and safety, ex-core neutron shielding studies are regularly performed. For example, neutron flux calculations in ex-core ionization chambers and pressure vessel neutron fluence studies are carried…
Multi-target and continuous monitoring by wireless implantable devices is of increasing interest for personalized therapy. In this work an implantable system is presented which is capable of measuring different drugs with Cyclic Voltammetry (CV) method. The wireless microsystem consists of four modules, namely (i) The…