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나찬주,윤영환,윤건식 國立 昌原大學校 産業技術硏究所 1994 産技硏論文集 Vol.8 No.-
The performance tests for an 87 PS 4-cylinder 4-cycle gasoline engine were carried out in order to measure the heat balances in various operating conditions. The experimental apparatus is equiped with 130kW eddy current dynamometer. In the heat balance diagram of the engine, mechanical losses could be quite accurately estimated by substracting shaft power from indicated power of the engine since the indicated power was obtained from indicator diagram by a piezo-electric pressure sensor located at the cylinder head and the shaft power was measured by the eddy current dynamometer. The typical results obtained in this study can be summarized as follows. First, The best engine performance shows around 2000 rpm of the engine speed in most running conditions. Second, The heat transfer rate to cooling water and to exhaust gas as well as output and frictional works change considerably with the engine speed and boost pressure. However, the extra losses(those are, heat transfers to oil, air, ete.) do not change much with respect to them. Third, The rate of mechanical loss increases as engine speed increases, but, at the same engine speed, the rate of mechanical loss does not change much as boost pressure varies.
김지윤,나찬주,손영후,Prabu Mani,윤민영 대한화학회 2023 Bulletin of the Korean Chemical Society Vol.44 No.6
The technological developments of metal–organic framework (MOF) for selec-tive adsorption and sensing have been achieved in recent years. Herein, wereport two stilbene-based MOFs, denoted as Zn3(SDC)3(bpy) (1) and Zn(SDC)(bpy)2DMF (2). MOFs1and2were synthesized in pure form by controllingthe organic linker ratio and were used for the adsorptive removal of dye mole-cules. Despite their low adsorption capacities, the MOFs were more selectivetoward cationic dye (methylene blue) than anionic dye (methyl orange). Theunique fluorescent property of the MOFs was harnessed for the sensing ofharmful organic molecules. Interestingly, the fluorescence of10was quenchedby aromatic analytes containing amine and nitro functional groups. However,20only showed modest fluorescence quenching by nitrobenzene. The quench-ing efficiency of nitrobenzene had a low detection limit for10and20(14.28 and25.42μM, respectively). These MOFs can be used as adsorbents and highly sen-sitive chemical sensors.