Materials Literature
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The lathe is a machine tool which plays an important role in the production process in the industry. In the process of turning the workpiece is gripped by rotating on its axis, while the cutting tool moves along the workpiece cut as a result there was an incision by a chisel to form grimly. In this process there are s…
Oriental Journal of Chemistry is a peer reviewed quarterly research journal of pure and applied chemistry. It publishes standard research papers in almost all thrust areas of current chemistry of academic and commercial importance. It provides a platform for rapid publication of quality research papers, reviews and ch…
A right methodology to determine preventively gaseous emissions arising from cutting process is essential to properly evaluate pollution in decommissioning a NPP. Said assessment can be related, in addition, to other diverse situations. In this paper, the estimated values of the pollution involved with plasma torch an…
본 연구는 지칭개, 박주가리, 큰부들, 띠 종자섬유에 대한 간단한 화학적, 물리적 특성을 파악하고 이의 활용가능성 여부를 알아보기 위해 수행되었다. Holocellulose 함량은 건조중의 74-88.5%로서 박주가리 종자섬유가 가장 높았고 전체적으로 큰부들 줄기의 것(59.5%)보다 높은 경향이었다. 그러나 holocellulose에 대한 alpha-cellulose의 비율은 45-48%로서 종자섬유간 서로 비슷하였다. 리그닌 함량은 17.0% (띠)-24.0% (박주가리), 회분은 0.22% (박주가리)-4.2%(띠), 열수추출물은 2.2% (지칭개)-7.8%…
Los recubrimientos duros han sido ampliamente utilizados en la industria metalmecánica para la protección de las superficies de las herramientas debido a las propiedades de las capas como baja fricción y alta resistencia al desgaste, siendo estos tratamientos superficiales adecuados para disminuir los costos en la ind…
In this paper, a composite patch antenna based on lefthanded material (LHM) with near zero index (NZI) is presented.This composite patch antenna is designed by assembling splitresonant rings (SRRs) and metal strips on the substrates. Thismultilayer composite structure results in a metamaterial with NZInear 13.89 GHz.…
Oriental Journal of Chemistry is a peer reviewed quarterly research journal of pure and applied chemistry. It publishes standard research papers in almost all thrust areas of current chemistry of academic and commercial importance. It provides a platform for rapid publication of quality research papers, reviews and ch…
In Petrobrás SA refineries, there are thousands of heat exchangers in which cooling water is treated for recycling, often by outsourced companies. In all of these refineries there happens shutdown for corrective maintenance of the exchangers by problems related to corrosion caused by the cooling water, requiring abou…
An ultrasound-assisted Sn-Ag-Pd activation method for electroless copper plating was presented in this study. With this activation process, it was shown that the fine catalyst particles were homogeneously distributed with high density on the entire specimen. In addition, it was observed that incubation period occurred…
Mixing and sintering aluminium and 20% mechanically alloyed Fe/B nanoparticles provokes the formation of intermetallics in the aluminium matrix when following a powder metallurgy route. Materials were sintered in a wide range of temperatures (from 600 to 1100 oC). Previous studies have shown that these materials prese…
The aim of this work was to determine the influence of X-rays, on the thermal properties of poly(methyl methacrylate), which is typically used as a material in technology of polymer optical fibers. The thermal properties of the optical polymer (PMMA - poly(methyl methacrylate) after the radiation were evaluated using…
The wear behavior of epoxy matrix composites filled with nano sized silica particles is discussed in this paper. Especially, the variation of the coefficient of friction and the specific wear rate under the various applied load and sliding velocity were investigated for these materials. Wear tests of pin-on-disc mode…
Hysteresis loops were calculated according the Stoner-Wohlfarth model. Using as values for constants of magnetocrystalline anisotropy K1 =4.5 and K2=0.66 (J m−3), and 1.61 T for magnetization of saturation of Nd2Fe14B, the maximum coercivity for isotropic Nd2Fe14B was predicted as mi0 H = 2.95 T (29.5kOe). For a very…
In this study, the photocatalytic decomposition characteristics of single toluene, toluene mixed with benzene, toluene mixed with acetone, and toluene mixed methyl mercaptan (MM) by UV reactor installed with $TiO_2$ -coated perforated plate were studied. The photocatalytic decomposition rate of single toluene, toluene…
The autoignition temperature (AIT) of a material is the lowest temperature at which the substance will spontaneously ignite in the absence of an external ignition source such as a spark or flame. The AIT may be used as combustion property to specify operating, storage, and materials handling procedures for processs sa…
고분자 소재는 금속 소재에 비해 기계적 강도, 특히 충격강도가 매우 취약하기 때문에 이의 증대를 위해 충격보강제를 이용하는 경우가 많다. 이러한 충격강도는 충격보강제의 함량과 분포에 따라 변화한다. 본 연구에서는 충격보강제가 함유된 나일론 6 시편에 대해서 충격시험을 모사하였고 충격시편 단면에서의 응력분포를 통해 충격강도 증대원리를 관찰하였다. 시편 단면에서 충격보강제의 개수와 분포에 따른 해석을 하여 비교하였다. 충격보강제의 개수가 증가할수록 부피가 감소하는 모델의 경우 놋치 표면의 응력과 주응력의 크기가 점차 높게 나타났다. 충격보강제의 개수가 증가할수록 충격보…
We present a synthesis of single-walled carbon nanotubes(SWNTs) for enhancement of parallel-alignment and density using chemical vapor deposition with methane feed gas. As-purchased ST-cut quartz substrates were heat-treated and line-patterned by electron-beam lithography in order to grow SWNTs with parallel alignment…
The effect of various synthesis conditions in the fabrication of graphene using the exfoliation methods has been investigated. Graphite oxide and graphene fabricated by various synthesis conditions were identified by SEM and XRD. Graphite oxide was made from graphite by the chemical oxidation, and graphene was manufac…
This paper deals with the effects of counterpart materials on the wear behavior of thermally sprayed STS316 coatings. STS316 powders were flame-sprayed onto a carbon steel substrate. Dry sliding wear tests were performed using the applied loads of 15 N. AISI52100, $Al_2O_3$ , $ZrO_2$ and $Si_3N_4$ balls were used as c…
Deposits of the Fe-6.5wt%Si alloy rapidly quenched by spray forming were investigated. The order phase can be either B2 or DO3 depending on annealing treatment conditions. The observation of pairs dislocations indicates the presence of super dislocations and B2 antiphase boundaries (APBs) which affects significantly t…