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Trace radioactive impurities in final construction materials for EXO-200
Leonard, D.S.,Auty, D.J.,Didberidze, T.,Gornea, R.,Grinberg, P.,MacLellan, R.,Methven, B.,Piepke, A.,Vuilleumier, J.-L.,Albert, J.B.,Anton, G.,Badhrees, I.,Barbeau, P.S.,Bayerlein, R.,Beck, D.,Belov, Elsevier 2017 Nuclear instruments & methods in physics research. Vol.871 No.-
<P><B>Abstract</B></P> <P>We report results from a systematic measurement campaign conducted to identify low radioactivity materials for the construction of the EXO-200 double beta decay experiment. Partial results from this campaign have already been reported in a 2008 paper by the EXO collaboration. Here we release the remaining data, collected since 2007, to the public. The data reported were obtained using a variety of analytic techniques. The measurement sensitivities are among the best in the field. Construction of the EXO-200 detector has been concluded, and Phase-I data was taken from 2011 to 2014. The detector’s extremely low background implicitly verifies the measurements and the analysis assumptions made during construction and reported in this paper.</P>
"Oceanus Resartus"; or, Is Chinese Maritime History Coming of Age?
Leonard Blussé 고려대학교 민족문화연구원 2017 Cross-Currents Vol.0 No.25
Perhaps the most salient feature of the transformation of China’s economic policy is its tack into the oceanic sphere. This is a break with the country’s traditional past as an inlandlooking, continental power: the landscape is now complemented by the seascape. This article suggests that China’s new relationship with the sea asks for a master plan for reclaiming a neglected maritime past—the invention of a national maritime tradition, a newly tailored past to explain China’s former relationship with the sea.
Leonard D. Tijing,Bock Choon Pak(박복춘),Byung Joon Baek(백병준),Dong Hwan Lee(이동환) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The present study investigated the mechanism of physical water treatment through particle count analysis of the water sample with and without physical water treatment (PWT) technology. The PWT methods utilized catalytic devices and low-voltage-high-frequency device wherein water continuously recirculated through them. Concentrated hard water at 2,300-2,700 μS/㎝ electrical conductivity was utilized in the study at two different flow rates (i.e., 500 l/h, and 800 l/h). After 66 hours of operation for each test, the results showed that the total number of particles in the PWT-treated cases increased from 165-539% as compared with the no-treatment cases depending on the flow rate used. The present results provided by particle counting support the bulk precipitation hypothesis as the mechanism of PWT and electro-flocculation mechanism with the use of catalytic materials and LVHF technique.