[en] The influences of O₂ partial pressure on saturation magnetization, coercivity and effective permeability of the as-deposited Fe-Sm-O thin films, which were fabricated by RF magnetron reactive sputtering method, were investigated. The nanocrystalline Fe_83.4Sm_3.4O_13.2 thin film fabricated at O₂ partial pressure of 5% exhibited the best magnetic softness with a saturation magnetization of 1.43 MA/m, coercivity of 65.2 A/m and effective permeability of about 2600 in the frequency range from 0.5 to 100 MHz. The electrical resistivity of Fe_83.4Sm_3.4O_13.2 was 130 μΩ cm. The microstructures and electrical resistivity were investigated in this work

[en] The magnetic properties of FeSmO films have been investigated in conjunction with thermal treatment. The FeSmO films were prepared by the RF magnetron sputtering method in Ar atmosphere. The film annealed at 500 deg. C had the good soft magnetic properties due to the grain growth of α-Fe

[en] We present a study of the collider observable m_T2 applied for pair-produced superparticles decaying to visible particles and a pair of invisible lightest supersymmetric particles (LSPs) at the LHC experiment. We also investigate the possibility to measure the top quark mass using the m_T2.

[en] Physical properties and microstructure of new coumarin 4 doped SiO₂-PDMS ORMOSILs, synthesized by one-step (OS, acid-catalysis) and two-step (TS, acid-base catalysis) routes of sol-gel method with varying pH (0.6 to 7) and dye content (5 x 10^-4 to 5 x 10^-2 mole), are reported. BET, UV-visible spectroscopy and SEM were used for characterizations. The increase in acid or base concentration increased the size of pores and aggregated silica particles. The samples with pH ≤ 2.5 were transparent and attributed to the small size of pores (∼20 A) and silica particles. The samples with pH > 2.5 were translucent or opaque due to non-uniform pore system formed by voids and large aggregated silica particles. The surface area was found a key factor controlling the interactions between the gel matrix and the dye. The OS samples with the highest dye concentration exhibited the minimal values of pore size, surface area and silica particle size, resulting in the concentration-quenching phenomenon

[en] The pore generation technology using PAHM (Poly-acrylonitrile Hollow Microsphere) was studied in order to reduce the weights of tableware. In this study, we verify the property of modified slurry and plasticity of green body by adding PAHM. The modified slurry was prepared by adding 25∼55vol% of PAHM to the slurry for whiteware. The viscosity of slurry was controlled to be low value (25∼45vol%). However, the viscosity of modified slurry increased and the plasticity of modified green body decreased inside the 45∼55vol% range. The formed specimen by slip casting was fired at 1225 deg. C, 1240deg. C. As the amount of PAHM content increased, the weight decreased and the addition of 45vol/% of PAHM resulted in a weight drop of 39%. However, when the PAHM content increased, the strength decreases over 50%. This is caused by the presence of a large volume of surface defects (pores) and defects from the agglomeration of PAHM.

[en] Decomposition promoting factors and decomposition mechanism in the zinc decomposition process of waste hard metals which are composed mostly of tungsten carbide and cobalt were evaluated. Zinc volatility amount was suppressed and zinc steam pressure was produced in the reaction graphite crucible inside an electric furnace for ZDP. Reaction was done for 2 hrs at 650 deg. C, which 100% decomposed the waste hard metals that were over 30 mm thick. As for the separation-decomposition of waste hard metals, zinc melted alloy formed a liquid composed of a mixture of γ-β1 phase from the cobalt binder layer (reaction interface). The volume of reacted zone was expanded and the waste hard metal layer was decomposed-separated horizontally from the hard metal. Zinc used in the ZDP process was almost completely removed-collected by decantation and volatilization-collection process at 1000 deg. C. The small amount of zinc remaining in the tungsten carbide-cobalt powder which was completely decomposed was fully removed by using phosphate solution which had a slow cobalt dissolution speed.

[en] Centimeter scale AlN sheet has been successfully synthesized by the direct nitridation method with an Al-NH_3–N_2–H_2 system. The starting material is Al sheet with 16-300 micron thickness. Al sheet was gradually transformed into AlN sheet in a tube furnace with NH_3–N_2–H_2 atmosphere at 900–1200°C. Synthesized a large scale AlN sheet has highly crystalline. The size of the AlN sheet with 30×100×0.0016mm has only AlN crystal phase. In microstructure analysis, there are fine AlN particles in an AlN sheet. AlN particle size decreased from 250 to 100 nm with decreasing reaction temperature in the tube furnace. Large scale AlN sheet synthesized at high reaction temperatures have low oxygen contents

[en] In this paper, continuous conducted noise and discontinuous transient or surge at the power ports of the Plant Control System (PCS) and the Core Protection Calculator (CPC) installed at No, 3 Main Control Room (MCR) in Uljin unclear power plant were measured and analyzed. The measured values and profiles for conducted noise were similar to those of nuclear plants gathered in US, and transient including surge were not found during measurements. The conducted limits, which is applicable to Korean standard, using the recursive least square analysis technique were derived from measured data. The limits obtained were compared with those of NRC and Electric Power Research Institute (EPRI)

[en] The partial substitution of Cu for Co in Na(Co_1-zNi _z)₂O₄ (0 ≤ z ≤0.15) led to an increase in the electrical conductivity (σ) mainly because of an increase in the hole concentration, density, and grain size of sintered bodies. On the other hand, the partial substitution of Ni for Co in Na(Co_1-yCu _y)₂O₄ (0 ≤ y ≤ 0.15) gave rise to a decrease in the electrical conductivity mainly because of a decrease in the density and grain size. In particular, the Cu and/or Ni substitution led to a significant increase in the Seebeck coefficient (α). The power factor (σα ²) was substantially improved by the partial co-substitution of Cu and Ni for Co in NaCo₂O₄. The highest value of power factor (3.27 x 10^-3 Wm^-1 K^-2) was attained for Na(Co_0.7Cu_0.15Ni_0.15)₂O₄ at 1073 K. It is concluded that the Cu and Ni co-substitution is effective for enhancing high-temperature thermoelectric properties

[en] Aim: To investigate the angle changes of the parent arteries after stent-assisted coil embolization of wide-necked intracranial bifurcation aneurysms. Materials and methods: The adjacent parent arterial angles before and after stent-assisted coil embolization were measured in 38 patients with aneurysms of the anterior communicating artery (ACoAA) and 41 patients with bifurcation aneurysms of the middle cerebral artery (MCABA). Variables were analysed in relation to the angle changes. Results: Vascular angles of the parent arteries significantly increased by 27.8° (±18.5°) immediately after stent-assisted coil embolization in 79 cases (p < 0.001), with 25.7° (±14.8°) in ACoAA and 29.7° (±21.4°) in MCABA, respectively. In 51 (64.6%) cases with follow-up angiography (mean interval 13.5 ± 4.1 months), vascular angles increased by 27.2° (±17.1°) immediately after treatment and further increased by 20.7° (±14.3°) at the last follow-up (all p < 0.001). More acute pre-stent angles of the parent arteries correlated with greater post-stent angle changes (p = 0.006). Younger age tended to be inversely related to post-stent angle changes (p = 0.091). Conclusion: Stent placement during coil embolization induced significant changes in the aneurysm–parent artery relationship. Further study is needed to elicit the association between angle change of the parent arteries and aneurysmal stability after coil embolization