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가스분무법으로 제조된 Zr65Al7.5Ni10Cu17.5 합금 분말의 비정질상 형성
박찬경,김형준,임경묵,김연욱 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.3
The amorphization behavior of a Zr_(65)A_(7.5)Ni_(10)Cu_(17.5) alloy powder fabricated by a vacuum gas atomization has been investigated in this study. The thermal stability of the present alloy powder was investigated using DTA, and was compared with that of the bulk amorphous alloy produced by casting. The ΔT_x(T_x-T_g) value of the amorphous powder was is smaller than that of the bulk amorphous alloy. This decrease in thermal stability was due to the two-step crystallization process of the amorphous phase. Each particle of the alloy powder was solidified to either fully amorphous phase or fully crystalline phase, indicating that the crystallization behavior of this powder was highly dependent on the isolation effect. Fully vitrified powder could be obtained when the powder size was below 45㎛. As the powder size increased, the fraction of the amorphous powder decreased. From these results, it is considered that the control of heterogeneous nucleation sites such as impurities and oxides is very important factor of amorphization of the present alloy powder.
초고속 용사법을 이용한 Zr65Al7.5Ni10Cu17.5 합금의 비정질 후막 형성
박찬경,김형준,임경묵,성병근 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.4
This investigation was conducted to clarify the effects of process variables such as spraying distance and fuel flow rate on the formation of the new amorphous coating using Zr_(65)Al_(7.5)Ni_(10)Cu_(17.5) alloy by a HVOF(High Velocity Oxygen-Fuel) spraying process. Powder used for spraying was prepared by vacuum gas atomization and centrifugal-mill. HVOF spraying experiments were carried out using a Tafa JP-5000 spraying gun. The amorphous content was measured up to about 65% depending on the spraying parameters. The amorphous fraction is decreased with increasing the spray distance. Microstructural observations and XRD analysis reveal that the change of amorphous fraction is attributed to the degree of solidification of droplets and the oxide (ZrO₂) formation in coatings. The higher fuel flow rate resulted in the decrease of amorphous fraction, and this decreased amorphous fraction was caused by the increase of oxide fraction. Therefore, flame temperature and spray distance that can control the oxide formation in coating and undercooling effects of droplets are the most crucial factors for the formation of amorphous coating using this alloy system.
김용철,길찬일,신정순,장진경,임혜자,우설희 대한마취과학회 1983 Korean Journal of Anesthesiology Vol.16 No.3
Myasthenia Gravis is a chronic disease of disputed etiology, possibly an auto-immune reaction to the moter end-plate, characterized by exacerbations and remissions, a rare disease entity in Korea. Myasthenia Gravis has offered many anesthetic problems because it affects respiratory muscles occasionally and bronchial secretion from preoperative anticholinesterase therapy. The chief concern is to ensure adequate respiration both during and after operation. During the year 1976-1982, we have experienced the anesthetic management of 8 patients with myasthenia gravis and thymectomy. From our experiences, we conclude that respiratory care and disuse of relaxants is the key to successful management.
Mn, Fe, Ni 첨가가 급속응고/분말야금법으로 제조된 Al-Zn-Mg-Cu 계 합금의 응력부식균열 거동에 미치는 영향
김상식,류재철,임수근,이명호 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.11
Stress corrosion cracking behaviors of RS/PM Al-9Zn-2.5Mg-1Cu alloys with the addition of 2%Fe, 2%Mn, and 1%Fe+1%Ni, respectively, were examined in the present study. Each alloy was exposed to 3.5% NaCl aqueous solution under an applied stress of 200MPa for 5 and 20 days, respectively, and tensile tested in air. The alloys containing Fe+Ni and Mn showed a significant reduction in ductility after exposure for 20 days. SEM fractographic studies indicated that the size and depth of dimples, as well as the sign of plastic deformation around dimples, were greatly reduced after exposure for those alloys susceptible to stress corrosion cracking. The present study strongly suggested that hydrogen played an important role in stress corrosion cracking behaviors of Al-9Zn-2.5Mg-1Cu alloys with the addition of 2%Mn and 1%Fe+1%Ni, respectively.
분쇄 폐타이어와 SBR 을 이용한 발포체의 가황거동 및 물성
서관호,임학상,임정철 한국고무학회 1997 엘라스토머 및 콤포지트 Vol.32 No.2
The effect of the ground rubber as filler on cure behavior and physical properties of SBR foam was studied in this research. We also studied how the amount and the particle size of the ground rubber affect them. As the ground rubber were added, the scorch time and the optimum cure time were shorter. It may be due to the migration of accelerators in the ground rubber into the SBR, we imagine. Adding the more ground rubber, however, obtaining the lower maximum torque. This is caused by the poor adhesive force between rubber surfaces as the ground rubber were added. When the same quantity of filler were added, 2G excelled CaCO₃ in tesile stress and elongation at break. Tensile fracture surfaces became rougher as the amount of the ground rubber increased as well as the particle size of the ground rubber was larger.
Jo, M.J.,Paek, A.R.,Choi, J.S.,Ok, C.Y.,Jeong, K.C.,Lim, J.H.,Kim, S.H.,You, H.J. North-Holland ; Elsevier Science Ltd 2015 european journal of pharmacology Vol.769 No.-
<P>The proto-oncogene c-Myc has been implicated in a variety of cellular processes, such as proliferation, differentiation and apoptosis. Several c-Myc targets have been studied; however, selective regulation of c-Myc is not easy in cancer cells. Herein, we attempt to identify chemical compounds that induce cell death in c-Myc-overexpressing cells (STF-cMyc and STF-Control) by conducting MTS assays on approximately 4000 chemical compounds. One compound, C604, induced cell death in STF-cMyc cells but not STF-Control cells. Apoptotic proteins, including caspase-3 and poly(ADP-ribose) polymerase (PAPP), were cleaved in C604-treated STF-cMyc cells. In addition, 5W620, HCT116 and NCI-H23 cells, which exhibit higher basal levels of c-Myc, underwent apoptotic cell death in response to C604, suggesting a role for C604 as an inducer of apoptosis in cancer cells with c-Myc amplification. C604 induced cell cycle arrest at the G2/M phase in cells, which was not affected by apoptotic inhibitors. Interestingly, C604 induced accumulation of c-Myc and Cdc25A proteins. In summary, a chemical compound was identified that may induce cell death in cancer cells with c-Myc amplification specifically through an apoptotic pathway. (C) 2015 Elsevier B.V. All rights reserved.</P>