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High-pressure growth of fluorine-free SmFeAsO<sub>1−<i>x</i></sub> superconducting single crystals
Lee, H-S,Park, J-H,Lee, J-Y,Kim, J-Y,Sung, N-H,Koo, T-Y,Cho, B K,Jung, C-U,Saini, S,Kim, S-J,Lee, H-J IOP Publishing Ltd 2009 Superconductor science & technology Vol.22 No.7
<P>Fluorine-free SmFeAsO<SUB>1−<I>x</I></SUB> single crystals of a nominal composition with <I>x</I> = 0.15 were grown under the pressure of 3.3 GPa and at 1350–1450 °C by using the self-flux method. Plate-shaped crystals of a few–200 µm in lateral size were obtained. The resistively determined superconducting transition of a single crystal was at about 53.5 K, with a narrow resistive transition width of 0.5 K. The detailed crystal structure was analyzed by using synchrotron-irradiated x-ray diffractometry and high-resolution scanning transmission electron microscopy. A sharp transition, a low residual resistivity, and a large residual resistivity ratio indicate the high quality of our single crystals. The temperature and magnetic field dependences of the magnetization also confirmed the absence of extrinsic impurity phases.</P>
새로 국내에서 밝혀진 균주(R19)와 전통적 균주를 이용하여 혈청학적으로 진단된 쯔쯔가무시병의 임상상 및 항체반응 양상
이수기,이은경,허충,임병욱,김용림,강재승,이진관,조준탁,박동철,박경현 대한감염학회 1991 감염 Vol.23 No.1
From September to December 1989, eighteen cases of tsutsugamushi disease were diagnosed by indirect immunofluorescent antibody test in Ulsan-Ulchu area. Their clinical features and patterns of antibody response to R. tsutsugamuschi were analyzed. It was most prevailing in female over 30 years old. Most of patients (16 patients) were rural inhabitants. Two patients in urban area had reaped the rice in the rice field at several days before onset of the disease. It occurred between September and November with a peak in October. Chief complaints of patients were febrile sensation with or without chills or headache. All patients had fever and chills. Headache and myalgia were common. In one patient, delirium with visual hallucination was seen. The major physical findings were skin rash (83%), eschr (78%), lymphadenopathy (11%). The skin rash appeared on whole body or on the trunk. The eschar appeared on the chest or abdomen or in the genial region. The antobody titer to R 19 that had been newly isolated strain in Korea was universally high. There often were anemia (31%), leukocytosis (23%). Microscopic hematuria and pyuria were also seen in routine urinalysis. Liver function tests showed eleveted aminotransferases and LDH. There were erythrophagocytic histiocytes in the bone marrows of six patients among the ten patients whose bone marrow had been aspirated. Chloramphenicol had been used in all patients. The mean time to alleviation of fever was 2.5 days. All patients were cured.
이충길,이우붕,여환진,이광필,배준웅,이무상,여수동,정원우 慶北大學校 師範大學 科學敎育硏究所 1998 科學敎育硏究誌 Vol.22 No.-
The purpose of this study was to develop the PC program of learning aids by using three dimension molecular model for high school chemistry class. Specifically, this study developed instructional materials of molecular structure and crystall model using Virtual Reality modeling Language The developed program would be expected to be helpful for constructing image of molecular and crystal structure in high school students. Also, it may be useful for chemistry teachers who want to introduce molecular and crystal model into their classes.
Lee, S. h.,Koo, K. Y.,Jung, U. H.,Shul, Y. G.,Yoon, W. L. Springer Science + Business Media 2016 Research on chemical intermediates Vol.42 No.5
<P>We investigated the pre-reforming of n-tetradecane (C14H30) over the K-promoted 50 wt% Ni/MgO-Al2O3 catalyst and also analysed the coke resistance. The 50 wt% Ni/MgO-Al2O3 catalysts were prepared by the deposition-precipitation method and 1-5 wt% of potassium was added to the catalyst using the impregnation method. The catalysts were characterized by ICP, XRD, H-2-chemisorption, H-2-TPR, and BET. The pre-reforming of n-tetradecane was performed under the reaction conditions of S/C = 4.0, GHSV = 3000 h(-1), and 400-450 A degrees C. The Ni crystallite size increased, whereas the Ni dispersion and surface area of catalysts decreased with increasing amounts of K. The 50 wt% Ni/MgO-Al2O3 showed large amounts of coke deposition compared to the K-promoted catalysts. It was found that the K addition over 50 wt% Ni/MgO-Al2O3 catalyst was beneficial for coke removal by promoting the coke gasification. A 1 wt%K/50 wt% Ni/MgO-Al2O3 catalyst showed stable activity during pre-reforming at S/C = 4.0, GHSV = 3000 h(-1), and 400 A degrees C. Furthermore, it had the lowest amount of surface coke, as observed by SEM, TEM, and TG analysis.</P>
전국 주요 시장에서 시판 중인 진주담치에 함유된 마비성 패독에 관한 조사 연구
이채언,이종태,조규일,정귀원,문덕환,신해림,김공현,배기택,김용완,백낙환 인제대학교 1990 仁濟醫學 Vol.11 No.1
마비성 패독(paralytic shellfish poison)은 강력한 자연계 신경독으로 먹이연쇄를 통해 패류에 축적되며 이를 인간이나 동물이 섭취할 경우 마비성 패류 중독(paralytic shellfish poisoning)을 발생하게 된다. 마비성 패류 중독은 미국, 캐나다 및 일본 등지에서 비교적 호발하고 있으나, 우리나라의 경우 최초의 공식 보고는 1986년 4월 부산지역에서 발생된 집단 중독례로 원인 패류는 진주담치(blue mussel, Mytilus edulis)였다. 본 조사자들은 1989년 4월부터 7월까지 전국 주요 시장 38개소에서 시판 중인 진주담치를 수거하여 mouse bioassay를 이용하여 마비성 패독 함유량을 산정하였기에 보고하고자 한다. Bioassays on paralytic shellfish poison(PSP) in blue mussels(Mytilus edulis) were earned out. The subject matters were collected from 38 markets of 26 places throughout the country, during the period of April to July, 1989. At the time of collection, they were classified into two groups by their sites produced either natural or cultured. As a result, it was identified that two subject matters which were collected from markets of both Boryong and Chinhae contained PSP. The PSP toxicity scores were 47.97㎍/100gm meat in Boryong, 48.84㎍/100gm meat in Chinhae respectively, which are much lower than the level of lethal dose. Hewever it is noticeable that blue mussels in markets contained PSP, which may increase the risk of paralytic shellfish poisoning. From the view point of public health, control measures for preventing paralytic shellfish poisoning are necessary.