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Jung Lee, Mi,Ik Lee, Jong,Garcia, Daniel,Moutte, Jaques,Terry Williams, C.,Wall, Frances,Kim, Yeadong Geochemical Society of Japan] 2006 Geochemical journal Vol.40 No.1
<P>The phoscorite-carbonatite complex in the Sokli alkaline-carbonatite massif, northern Finland, comprises five stages of intrusions of phoscorites and carbonatites (P1-C1, P2-C2 and P3-C3 for phoscorites and calcite carbonatites;D4 and D5 for dolomite carbonatites). The phoscorites and calcite carbonatites at Sokli usually occur as pairs with the same mineral assemblages. Pyrochlore is found in the majority of rock types in the Sokli phoscorite-carbonatite complex, shows wide compositional variation and seems to preserve evolution trends of host rocks. Crystallization of pyrochlore begins from the P2-C2 phoscorite and calcite carbonatite and continues up to the latest D5 dolomite carbonatite. Pyrochlore in the early stage P2-C2 rocks has high U and Ta contents. These elements suddenly decrease from the P3-C3 rocks, on the other hand, Th and Ce contents increase. The compositions of the late generations from the D4 and D5 rocks are close to that of an ideal end-member pyrochlore with formula <TEX>$(Ca,Na)_2Nb_2O_6$</TEX> F. The Nb/Ta ratio and F content of pyrochlore increase from P2-C2 to the latest D5 dolomite carbonatite. The composition and evolutionary history of pyrochlore from the phoscorites are distinguished from those of the associated calcite carbonatites. Pyrochlore from the calcite carbonatites shows larger A-cation deficiencies compared to those from the paired phoscorites. Ta and Zr contents are slightly higher in pyrochlore from the calcite carbonatites, whereas Ti is generally higher in pyrochlore from the associated phoscorites. Moreover, pyrochlore from the phoscorites always shows a longer and more complex crystallization history compared to that of the same stage carbonatites. This indicates that the chemical condition was clearly different in the two systems during the crystallization of pyrochlore. Based on these results, together with the previous mineralogical and geochemical studies on the Sokli phoscorite-carbonatite complex, we propose a liquid immiscibility process as the most possible seg-regation mechanism of the two associated rocks. The composition of pyrochlore in the late dolomite carbonatites is dis-tinct and always lies on the evolutional trend of the earlier varieties. This implies that the dolomite carbonatites are the final magmatic products of the Sokli phoscorite-carbonatite system.</P>
Biodiesel synthesis using chicken manure biochar and waste cooking oil
Jung, Jong-Min,Lee, Sang-Ryong,Lee, Jechan,Lee, Taewoo,Tsang, Daniel C.W.,Kwon, Eilhann E. Elsevier Applied Science 2017 Bioresource technology Vol.244 No.1
<P><B>Abstract</B></P> <P>This study laid an emphasis on the possible employment of biochar generated from pyrolysis of chicken manure to establish a green platform for producing biodiesel. To this end, the pseudo-catalytic transesterification reaction using chicken manure biochar and waste cooking oil was investigated. Compared with a commercial porous material (SiO<SUB>2</SUB>), chicken manure biochar generated from 350°C showed better performance, resulting in 95.6% of the FAME yield at 350°C. The Ca species in chicken manure biochar imparted strong catalytic capability by providing the basicity for transesterification. The identified catalytic effect also led to the thermal cracking of unsaturated FAMEs, which decreased the overall FAME yield. For example, 40–60% of converted FAMEs were thermally degraded. To avoid undesirable thermal cracking arising from the high content of the Ca species in chicken manure biochar, the fabrication of chicken manure biochar at temperatures ≥350°C was highly recommended.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Biodiesel synthesis using chicken manure biochar. </LI> <LI> Establish a green platform for producing biodiesel using chicken manure biochar. </LI> <LI> Enhanced yield of biodiesel using chicken manure biochar due to strong catalytic capability. </LI> <LI> 95.6% of the FAME yield using chicken manure biochar generated from 350°C. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
30 Gbps High-Speed Characterization and Channel Performance of Coaxial Through Silicon Via
Jung, Daniel H.,Heegon Kim,Sukjin Kim,Kim, Jonghoon J.,Bumhee Bae,Jonghoon Kim,Jong-Min Yook,Jun-Chul Kim,Joungho Kim THE INSTITUTE OF ELECTRICAL ENGINEERS 2014 IEEE Microwave and Wireless Components Letters Vol. No.
<P>Coaxial through silicon via (TSV) technique allows reduction of high frequency loss due to conductivity in silicon substrate and flexibility in impedance by controlling the ratio of shield to center radii. For the first time, we measured and analyzed the high-speed channel performance of coaxial TSV. This letter presents the measurement results of the fabricated test vehicle in S-parameter and eye-diagram. The eye-diagram measurement results prove that coaxial TSV is capable of supporting signal transmission up to bit rate of 30 Gbps. The equivalent circuit model is suggested and experimentally verified by S-parameter comparison. Furthermore, the superiority of coaxial TSV over conventional TSV is confirmed by comparison of S-parameter results from equivalent circuit model simulation.</P>
CASE REPORT : A Case of Pulmonary Artery Sarcoma Presented as Cavitary Pulmonary Lesions
( Daniel Min ),( Ji Hyun Lee ),( Hye Cheol Jeong ),( Jung Hyun Kim ),( Suk Pyo Shin ),( Hong Min Kim ),( Kyu Hyun Han ),( Hye Yun Jeong ),( Eun Kyung Kim ) 대한결핵 및 호흡기학회 2014 Tuberculosis and Respiratory Diseases Vol.76 No.3
Pulmonary artery sarcoma (PAS) is a rare, poorly differentiated malignancy arising from the intimal layer of the pulmonary artery. Contrast-enhanced chest computed tomography (CT) is a good diagnostic modality that shows a low-attenuation filling defect of the pulmonary artery in PAS patients. An 18-year-old man was referred to our hospital for the evaluation and management of cavitary pulmonary lesions that did not respond to treatment. A contrast-enhanced CT of the chest was performed, which showed a filling defect within the right interlobar pulmonary artery. The patient underwent a curative right pneumonectomy after confirmation of PAS. Although lung parenchymal lesions of PAS are generally nonspecific, it can be presented as cavities indicate pulmonary infarcts. Clinicians must consider the possibility of PAS as well as pulmonary thromboembolism in patients with pulmonary infarcts. So, we report the case with PAS that was diagnosed during the evaluation of cavitary pulmonary lesions and reviewed the literatures.