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The fabrication of $MgB_2$/SUS Tapes by PIT Process
송규정,이남진,장현만,하홍수,하동우 한국초전도학회 2002 Progress in superconductivity Vol.3 No.2
We have fabricated successfully single-filament composite $MgB_2$/SUS tapes, as an ultrarobust conductor type. The fabrication of the $MgB_2$/SUS tapes was performed by power-in-tube (PIT) process such as swaging and cold rolling. The critical transition temperatures $T_{c}$~38.5 K and ~36 K were observed for the sintered and the nonsintered $MgB_2$/SUS tapes, respectively In addition, the isothermal magnetization M(H) of the sintered $MgB_2$/SUS tapes was measured at temperatures T (between 5 and 50 K) in fields up to 6 T, employing a PPMS-9 (Quantum Design). The persistent current density (J$T_{P}$) values were obtained from the M(H) data, using Bean model, fur the sintered $MgB_2$/SUS tapes. The estimated values were higher than ~ 6$\times$ $10^{5}$ $A/\textrm{cm}^2$ at T = 5 K, with H : 0 G. We also investigated the cross section of the sintered tapes, by using SEM and EDX. An evidence of weak reaction on boundary between $MgB_2$ and SUS tube is found in the SEM and EDX.X.X.X.
송규정,박성윤,황규태,황태규,이순용 인제대학교 1987 仁濟醫學 Vol.8 No.3
저자들은 과거 6년간 본원 소아과에 입원하여 뇌막염으로 진단받은 환아 327례를 대상으로 무균성, 화농성, 결핵성 뇌막염으로 분류하여 임상적 소견을 비교 관찰하였다. The authors observed 327 cases of meningitis (aseptic 170, purulent 86, tuberculous 1) in infancy and childhood, who were admitted to the department of Pediatrics of Inje Medical College, Pusan Paik Hospital, during the period of 6 years from June, 1979 to May, 1985. The Results were summerized as follows: 1.The annual incidence had no tendency to decrease during the 6 years. In monthly incidence, there was high prevalence in May and September for aseptic meningitis, but no difference of prevalence for purulent and tuberculous meningitides. 2.In age distribution, the peak incidence of aseptic meningitis was in the range of 6 to 10 years of age, purulent meningitis was below 1 year of age and tuberculous meningitis was in the range of 1 to 5 years of age. Male to female ratio was 2.3:1 for aseptic meningitis, 2.2:1 for purulent meningitis, and 1.4:1 for tuberculous meningitis. 3.The Chief complaints on admission were fever, vomiting, headache, consciousness change and convulsion in order. In purulent and tuberculous meningitides, fever was the most common symptom and vomiting was for aseptic meningitis. 4.The principal signs of physical examination were neck stiffness (62.4%), Kernig's sign (28.771) and Brud-zinski's sign (25.4%) in order and relatively higher percentage of consciousness change was present at diagnosis in purulent and tuberculous meningitides. In aseptic meningitis, 31.2% of cases had no meningeal irritation sign. 5.Anemia and leukocytosis on CBC were more frequent in purulent meningitis than in others. 6.In the CSF examination on admission, cell counts were most frequently below 300/mm3 in aseptic meningitis(71.2%), 100 to 499/mm3(63.4%) in tuberculous meningitis, and above 1,000/mm3(54.7%) in purulent meningitis. The protein level was most frequently over 100mg/dl in purulent meningitis (76.7%) and tuberculous meningitis (74.6%). The sugarlevel was most frequently above 50mg/dl in aseptic meningitis(81.8%) and below 50mg/dl in purulent menigitis(55.8%) and tuberculous menigitis (74.6%). 7.The etiologic organisms were isolated from CSF in 26.7% of purulent meningitis. The most prevalent organism was streptococcus pneumoniae. 8.In aseptic meningitis, the clinical course was benign and the prognosis was good, while in purulent and tuberculous menigitides, mortality rate(respectively 11.6% and 16.9%), complications and sequelaes(respectively 29.1% and 66.2%) were still high.
Magnetism in Ni-W textured substrates for coated conductors
송규정,박찬,김석환,김호섭,오상수,주진호,박유미,양주생,고락길,하홍수,김찬중 한국초전도.저온공학회 2005 한국초전도저온공학회논문지 Vol.7 No.2
The magnetic properties of a series of both annealed (biaxially textured) and as-rolled (non-textured) Ni-xW alloy tapes with compositions x = 0, 1, 3, and 5 at.%, were studied. Characterization methods included XRD analyses to investigate the biaxial cube texturing of the annealed Ni-W alloy tapes and studies of the magnetization M for both annealed and as-rolled Ni-W alloy tapes. Both the isothermal mass magnetizations M(H) of a series of samples at different fixed temperatures and M(T) in fixed field, employing a PPMS-9 (Quantum Design), were measured. The Ni-W alloys have shown much reduced ferromagnetism as W-content x increases. Both the saturation magnetization Msat and Curie temperature Tc decrease linearly with W-content x, and both Msat and Tc go to zero at critical concentration of xc ~ 9.50 at.% W.