Materials Literature
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기존 경질 원유 자원의 매장량 고갈과 중국, 인도 등 개발도상국에서의 에너지 수요가 급증하면서 원유 자원의 공급이 수요를 감당하지 못하는 상황이 벌어지고 있고, 따라서 상대적으로 활용도가 낮았던 중질유를 효율적으로 이용하는 방안이 대두되고 있다. 중질유를 활용하기 위해서는 경질화 과정을 거쳐야하는데, 특히 공정이 단순하고 경제적인 열분해 기술이 적합하다고 할 수 있겠다. 본 연구에서는 중질유의 열분해 특성 분석의 기초 자료를 얻기 위해 중질유에서 아스팔텐이 제거된 deasphalted oil(DAO)의 열분해 실험을 수행하였다. DAO는 solvent deaspha…
Real time spectroscopic ellipsometry (RT-SE) in the near-infrared to ultraviolet range, as well as pre-deposition and post-deposition mid-infrared spectroscopic ellipsometry (IR-SE) have been applied as probes of the formation of optical interfaces in sputter-deposited CdS/CdTe solar cell structures. Both optical prob…
A semi-empirical method for establishing of the average charge of ions passing through thin celluloid films is proposed. Calculations for helium (He) and nitrogen (N) ions with different initial velocities (12−18.7 × 10 8 cm/s for He and 4−12 × 10 8 cm/s for N) are presented. The equilibrium thickness of a celluloid t…
The compositional, crystal and microstructural, optical transmission and absorption properties of ZnxCd1-xS thin films at low zinc (Zn) content (x=0.2) fabricated by RF co-sputtering using CdS and ZnS were investigated. These ternary compounds were characterized by energy dispersive X-ray analysis (EDX) for compositio…
Plate-impact experiments have been used to interrogate the influence of gauge alignment on the shock response of wire-element lateral manganin stress gauges in PMMA and aluminium targets. Embedded gauges were progressively rotated relative to the target impact face. Peak stress and lateral gauge rise-times were found…
Mechanisms of structure fragmentation and strengthening of single crystals of a Hadfield steel after warm torsion under high-pressure torsion (HPT) and subsequent annealing in a temperature range of 400–800°C have been studied. Multiple twinning and formation of ultrafine carbides upon HPT at 400°C ( P = 5 GPa) promot…
Synthesis of nanocomposite based on binary compound and determination of dependence between the values of magnetocaloric effect (MCE) and the grain size of such specimens are the purposes of this work. The results of the investigation in microcrystalline and nanocrystalline samples Y25Fe75 and Y35Fe65 alloys show, tha…
PURPOSE: To calculate photon energy deposition kernels (EDKs) used for convolution/superposition dose calculation at a higher resolution than the original Mackie et al. 1988 kernels and to calculate material-specific kernels that describe how energy is transported and deposited by secondary particles when the incident…
Fe3O4/T-ZnOw composites are fabricated by depositing a layer of Fe3O4 film on the surface of tetrapod-shaped ZnO whisker (T-ZnOw) by ferrite plating method. The morphology, structure and magnetic properties of the composites are characterized by scanning electron microscopy (SEM), X-ray diffractometer (XRD) and vibrat…
In order to improve the oxidation resistance of carbon/carbon (C/C) composites, a ZrSiO4coating on SiC pre-coated C/C composites was prepared by a hydrothermal electrophoretic deposition process. The phase composition, surface and cross-section microstructure, anti-oxidation property of the as-prepared ZrSiO4/SiC coat…
Noise and vibration in electric machines is a significant issue to take into account when high performance is wanted to be achieved. During operation, vibration frequencies which match the resonance frequencies of the structure are absolutely to be avoided, because of their negative effect on the machine performance a…
A study on the iron-loss reduction of 110kW-class Interior Permanent Magnet Synchronous Motor (IPMSM) for Light Railway Transit (LRT) is conducted in this paper. In general, the iron loss of IPMSM is a value that depends on the characteristics of core material and non-oriented electrical steel is used as core material…
Abstract We report that the solution‐processed vanadium pentoxide (V 2 O 5 ) layer can be utilized as an effective and stable hole injection layer (HIL) in organic light‐emitting diodes (OLEDs) instead of polyethylene dioxythiophene:polystyrenesulfonate (PEDOT:PSS) or thermally‐evaporated metal oxides. The device with…
Results of fabrication and study of Ba1-xLaxTi1-x/4O3(BLT) ceramics for x within the range 0.001≤x≤0.004 is reported in the present paper. BLT ceramics has a structure based on ABO3–type perovskite, and its properties strongly depend on the chemical comSubscript textposition. The interrelated semiconductor and ferroel…
The method of density matching between the solid and liquid phases is often adopted to effectively eliminate the effect of sedimentation of suspensions on dynamic behavior of a colloidal system. Experiments on crystallization of charged colloidal microspheres with diameter of 98 nm dispersed in density-matched and -un…
nanoTiO2/PBO composite fiber was prepared with a chemical method by depositing nanoTiO2 on the surface of PBO fiber which was treated by silane coupling agent. The process parameters on the preparation of nanoTiO2/PBO composite fiber were optimized according to the interfacial adhesion between the composite fiber and…
Shrinkage behavior caused by a single-line scan of an electron beam over a photoresist line was observed, including shrinkage distribution in the photoresist-line direction. A new method for evaluating the minute amount shrinkage and the shrinkage distribution caused by a single-line scan was developed. According to t…
The practical realization of high efficiency laser-doped semiconductor fingers (SCF) silicon solar cell is inhibited by high contact resistance. By plating the SCF with metal, a new SCF cell concept known as the “Advanced SCF” (AdvSCF) cell that can resolve the contact resistance problem is presented. In the first Adv…
Recently, O2or N2O plasma treatment has been extensively investigated about the passivation effect of AIGaN/GaN HFETs. However, the effect was not consistent. Due to ion bombardment on the sample surface, the devices might be significantly degraded , suggesting that it might be difficult to suppress the plasma damage.…
Integral dissolution enthalpies Δsol H m of L-asparagine in the mixtures of water with glycerol, ethylene glycol, and 1,2-propylene glycol at the concentration of organic solvents up to 0.24 mole fraction were measured by the calorimetry method. The standard enthalpies of dissolution (Δsol H 0) and transport (Δtr H 0)…