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Nihat Ayyi ldi z,Ahmet Y 대한수학회 2006 대한수학회지 Vol.43 No.6
This paper develops in detail the dierential geometryof ruled surfaces from two perspectives, and presents the under-lying relations which unite them. Both scalar and dual curvaturefunctions which dene the shape of a ruled surface are derived.Explicit formulas are presented for the computation of these func-tions in both formulations of the dierential geometry of ruled sur-faces. Also presented is a detailed analysis of the ruled surface whichcharacterizes the shape of a general ruled surface in the same waythat osculating circle characterizes locally the shape of a non-nullLorentzian curve.
New enchytraeid species from Mount Hallasan (Jeju Island, Korea) (Enchytraeidae, Oligochaeta)
DÓ,ZSA-FARKAS, KLÁ,RA,FELFÖ,LDI, TAMÁ,S,NAGY, HAJNALKA,HONG, YONG Magnolia Press 2018 Zootaxa Vol.4496 No.1
<P>The enchytraeid fauna of Mt. Hallasan (Jeju Island, Korea) was studied in 2016, and 21 enchytraeid species were recorded and identified in total. A combination of morphological and molecular analyses (based on CO1, ITS and H3 sequences) was applied. Here we give descriptions of eight new species of Enchytraeidae (Clitellata): Achaeta koreana sp. n., Achaeta macroampullacea sp. n., Bryodrilus hallasanensis sp. n., Chamaedrilus baekrokdamensis sp. n., Enchytronia seongpanakiensis sp. n., Mesenchytraeus jungsaihoi sp. n., Xetadrilus jejuensis sp. n. and Xetadrilus aphanoides sp. n. Additionally, two species were found to be new for the Korean fauna in Mt. Hallasan: Fridericia cf. paroniana Issel, 1904 and F. perrieri (Vejdovský, 1878); three potentially new Fridericia species require further studies. Furthermore, two terrestrial polychaetes, Hrabeiella periglandulata Pižl & Chalupský, 1984 and Parergodrilus heideri Resisinger, 1925, were recorded. For 12 enchytraeid species, DNA sequences are presented for the first time: these include, apart from the new species, further taxa such as species of Xetadrilus, a genus of which no sequences were previously available.</P>
IMPROVING HEAVY DUTY VEHICLES FUEL CONSUMPTION WITH DENSITY AND FRICTION MODIFIER
Máté Zöldy 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.5
With the increasing role of electro mobility it is predictable that for heavy duty sector it would not be able to replace the traditional engines. There are several researches to develop alternative propulsion solutions but in short term the efficiency improvement of diesels both in engine and fuel side is a must. In this research paper the main influencers of diesel fuel composition on combustion is investigated based on literature overview. Our research is focusing as most important parameters the density and friction. Different sample fuels were prepared to show how these parameters influencing fuel consumption in engine bench measurements. Our results showed that both with density and modification of friction are tools to improve fuel.