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Torii, Masato,Matsuda, Yosuke,Seo, Sang Tae,Kim, Kyung Hee,Ito, Shin-Ichiro,Moon, Myung Jin,Kim, Seong Hwan,Yamada, Toshihiro The Korean Society of Mycology 2014 Mycobiology Vol.42 No.2
In Korea, mass mortality of Quercus mongolica trees has become obvious since 2004. Raffaelea quercus-mongolicae is believed to be a causal fungus contributing the mortality. To evaluate the pathogenicity of the fungus to the trees, the fungus was multiple- and single-inoculated to the seedlings and twigs of the mature trees, respectively. In both the inoculations, the fungus was reisolated from more than 50% of inoculated twigs and seedlings. In the single inoculations, proportions of the transverse area of non-conductive sapwood at inoculation points and vertical lengths of discoloration expanded from the points were significantly different between the inoculation treatment and the control. In the multiple inoculations, no mortality was confirmed among the seedlings examined. These results showed that R. quercus-mongolicae can colonize sapwood, contribute to sapwood discoloration and disrupt sap flows around inoculation sites of Q. mongolica, although the pathogenicity of the fungus was not proven.
SHUICHI TORII,Yoshino Hajime 대한설비공학회 2015 International Journal Of Air-Conditioning and Refr Vol.23 No.1
Experimental study is performed on the turbulent heat transfer behavior of aqueous suspensionsof nanoparticles °owing through a horizontal circular pipe heated under constant heat °uxcondition. Consideration is given to the e®ects of nanoparticle concentration and Reynoldsnumber on heat transfer enhancement. It is found that (i) heat transfer enhancement is caused bysuspending nanoparticles, so that maximum value of the Nusselt number is over twice than that ofthe pure working °uid, (ii) graphene-oxide-nano°uid developed here is non-Newtonian °uid, and(iii) but the pressure drop for graphene-oxide-nano°uid is almost the same as that of the pureworking °uid, because volume fraction of particles is less than 1.0%.
Experimental Study on Thermal Transport Phenomenon of Nanofluids as Working Fluid in Heat Exchanger
SHUICHI TORII 대한설비공학회 2014 International Journal Of Air-Conditioning and Refr Vol.22 No.1
This paper aims to study the convective heat transfer behavior of aqueous suspensions ofnanoparticles flowing through a horizontal tube heated under constant heat flux condition. Consideration is given to the effects of particle concentration and Reynolds number on heattransfer enhancement and the possibility of nanofluids as the working fluid in various heatexchangers. It is found that (i) significant enhancement of heat transfer performance due tosuspension of nanoparticles in the circular tube flow is observed in comparison with pure water asthe working fluid, (ii) enhancement is intensified with an increase in the Reynolds number andthe nanoparticles concentration, and (iii) substantial amplification of heat transfer performanceis not attributed purely to the enhancement of thermal conductivity due to suspension ofnanoparticles.