Materials Literature
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The Bi-mode Gate Commutated Thyristor (BGCT) is a reverse conducting Gate Commutated Thyristor (GCT) where the diode regions are intertwined with GCT parts. In this work we examine the impact of shallow diode-anodes on the operation of the GCT and propose the introduction of optimised High Power Technology (HPT+) in t…
This paper proposes a new integrated structure for the interleaved boost converter. The structure includes the main windings and the multipliers on the same core. Where the single core boost topology would provide a minimum iron losses. A new method to calculate the eddy current loss for the used core is presented. Th…
This paper considers switching overvoltage that occurs in the power-supply system of oxygen-converter manufacturing when a circuit vacuum breaker is triggered. The particular features of such systems are analyzed, and a typical power supply scheme is considered. It is noted that overvoltage manifesting a highfrequency…
Abstract A study is presented showing results of predictions of the amount of water ejected from shallow depth explosions. Measurements of the Equivalent Water Length (EWL) are determined by integrating the density along a horizontal line through the plume. These EWL values are important for the assessment of the viab…
The research deals with the regularities for Cu 3 Ge compound formation under the low temperature treatment of a double-layer Cu/Ge system deposited on i-GaAs substrate in atomic hydrogen flow. The treatment of a Cu/Ge/ i -GaAs system with layer thicknesses, respectively, of 122 and 78 nm, in atomic hydrogen with a fl…
A new dynamical model of time-dependent dislocation microyielding has been proposed using the propounded structure-energy-concept of long-continued strength in terms of dragging mechanisms responsible for microyield resistance increase in solid solutions below macroscopic yield stress. A physical theory of long-term,…
I will review our combined local-probe and transport measurements on three types of semiconductor chalcogenide systems. Starting with Cu2S nanocrystals, I will present a new method for achieving p-type doping, by which Cu vacancies are formed upon annealing at moderate temperatures, yielding free holes. Consequently,…
Introduction: Volatile organic compounds from industrial activities are one of the most important pollutants released into the air and have adverse effects on human and environment. Therefore, they should be removed before releasing into atmosphere. The aim of the study was to evaluate xylene removal from air by nano-…
PN heterojunctions comprised of n-type nitrogen-doped ultrananocrystalline diamond/hydrogenated amorphous carbon composite (UNCD/a-C:H) films deposited on p-type Si substrates were fabricated in nitrogen and hydrogen mixed gas atmospheres by coaxial arc plasma deposition. The heterojunction devices showed typical rect…
Mass attenuation coefficient of various soil samples (density ranges between 2.22 and 2.3gcm-3) collected from three sites distributed in Kurdistan Region of Iraq land have been determined for gamma energy 0.662MeV using gamma spectrometry. The average mass attenuation coefficients for the studied samples were found t…
Passive components like capacitors for harsh environments become more and more important, e. g. in the field of deep drilling, aerospace or in the automotive industry. They have to withstand temperatures up to 300 °C with a good performance concerning leakage current, breakdown voltage and capacitance density. The who…
We studied the electronic and structural properties of the interfaces between the niccolite (n-) polymorph of ferromagnetic MnSb and the binary semiconductor InP along the MnSb(0001)/InP(111) direction. Plane-wave pseudopotential ab-initio electronic structure calculations were used. The Mn-to-P interface becomes 63.0…
In the present work, two algebraic approaches to calculate magnetic flux linkage of Surface Permanent Magnets Synchronous Machines, (SPMSM), are described. The first one is based on a developed magnetic circuit for load condition, and the second one consists on a magnetic permeance network. Although both approaches's…
The smooth surface of an N-polar GaN/AlxGa1-xN/GaN heterostructure was successfully grown by metalorganic vapor phase epitaxy (MOVPE) on sapphire substrates with a small off-cut angle of 0.8° toward the a-plane. The 2DEG of an N-polar GaN/AlxGa1-xN/GaN heterostructure has been confirmed by Hall-effect measurement from…
In this paper a review is given of computing procedures for evaluation of the absorption current and recovery voltage measurements in dielectric systems. The method based on the recovery voltage measurement is treated in details and compared with some selected methods used in this field. All computing procedures were…
This approach newly gives insight to the design and implementation of an advanced lithium nickel cobalt aluminum oxide (LiNoCoAlO2 or NCA) cell grouping combined with the discrete wavelet transform (DWT) for frequency regulation renewable energy storage system (RESS) in grid-connected application. For an advanced NCA…
Experimental checking of the specific absorption rate (SAR) level modifications when using conductive textiles attached to mobile phone handsets was applied by using the COMOSAR system in both 2G and 3G communication standards. Based on measured data, SAR reduction effectiveness was calculated. Results indicated eithe…
Concerns around global warming have led to a nuclear renaissance in many countries, meanwhile the nuclear industry is warning already of a need to train more nuclear engineers and scientists, who are needed in a range of areas from healthcare and radiation detection to space exploration and advanced materials as well…
A quasi-bipolar channel modulation instability mechanism of the commercial P-GaN gate High Electron Mobility Transistor (HEMT) device is proposed. The device operation instability phenomenon caused by the quasi-bipolar channel modulation is investigated. Both the hole injection and the electron pumping mechanism of th…
The methods for the synthesis of water-soluble copolymers having porphyrin units in the side chain are described. Molecular-mass characteristics of the copolymers and mole content of porphyrin in copolymers are determined.