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Linear buckling analysis of welded girder webs with variable thickness
Emanuele Maiorana,Carlo Pellegrino 국제구조공학회 2011 Steel and Composite Structures, An International J Vol.11 No.6
Steel girder web panels have been subjected in recent decades, to a number of experimental and numerical studies but the mechanisms that regulate the behaviour of the panels composed by two subpanels with different thickness were not deeply studied. Furthermore specific design rules regarding the estimation of the buckling coefficient for panels with variable thickness are not included in the codes even if this is a common situation particularly for steel bridge girders with beams having significant height. In this framework,this work aims to investigate buckling behaviour of steel beams with webs composed of panels with different thicknesses subjected to both in-plane axial compression and bending moment and gives some simplified equations for the estimation of the buckling coefficient.
( Emanuel Pastreich ) 성균관대학교 동아시아학술원 2005 Sungkyun Journal of East Asian Studies Vol.5 No.1
This paper considers the effort of the Korean scholar Hong Hui-bok to revitalize Korean vernacular narrative and give it an authority equivalent to that of literature proper. He did so in the preface to his translation into vernacular Korean of the Chinese novel Jinghuayuan (1835). This preface is the first attempt by a Korean intellectual to analyze Korean vernacular narrative in a systematic manner. Hong`s argument makes clear the relationship between the Korean concern with vernacular Korean writing and the awareness of a Chinese vernacular. The paper considers why Jinghuayuan interested Hong and how he adapted it for a Korean readership. Moreover, the full preface is presented along with a careful consideration of its implications. The social and historical background behind Hong`s theory of the novel, and his predecessors in the Chinese tradition are also treated.
Linear Elastic Behavior of Circular Holed Steel Box Sections Under Compression
Emanuele Maiorana,Carlo Pellegrino 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.3
The aim of this work is to provide insights into the linear elastic behavior of steel box sections with centered and eccentric holes, placed at various points on the sides and at the corners of sections, and subjected to uniform compression. The infl uence of the following parameters was observed on stability, mainly through critical deformed shapes: (a) ratio of section aspects, (b) length-to-width ratio, (c) slenderness of sides, (d) diameter of holes, (e) coordinates x and y of the position of the hole on one side of the box section. Indications regarding important design aspects are given: (a) the best location for a single hole, or several holes, in cross-section; (b) the eff ects of circular holes with small, medium and large diameters on the linear buckling factor; (c) the eff ect of symmetric and eccentric holes for purposes of stability; (d) the best performing transversal section for square to rectangular holed box sections, in terms of stability; (e) critical slenderness values at which transition occurs from ultimate strength collapse of stocky box sections and critical elastic stress of slender ones.
Emanuel Vamanu,Diana Pelinescu,Irina Marin,Adrian Vamanu 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.4
The purpose of this study was to test the viability of the probiotic bacteria product in a unicameral system, gastrointenstinal simulation (GIS1), for in vitro simulation of the conditions in the stomach and small intestine. The product contained a ratio of 1:1 Lactobacillus paracasei YR and Enterococcus faecium VL47 strains, in freeze-dried form and 10 g/L lactulose. The strains’viability was evaluated under simulated gastric and small intestine conditions, in comparison with Lactobacillus johnsonii La1 strain. The experiment was performed in the presence/absence of lactulose. The strains of L. johnsonii La1 and E. faecium VL47 have shown a better resistance to bile salts and low pH, in comparison with L. paracasei YR. The survival capacity, Cs, was equal to 0 for L. paracasei YR after addition of pancreatic juice and bile salts. Losses for the other 2 strains were about 6 log CFU/mL after transit through the compartments.
Biological Activity of Fluidized Bed Ethanol Extracts from Several Edible Mushrooms
Emanuel Vamanu,Sultana Nita 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.5
In vitro antioxidant and anti-inflammatoryactivities of fluidized bed ethanol extracts of Pleurotusostreatus PQMZ91109, PBS281009, M2191 (obtained froma laboratory greenhouse), Agaricus bisporus, Marasmiusoreades, Craterellus cornucopioides, and Tuber melanosporumwere investigated using free radical scavenging activities,metal chelating effects, inhibition of lipid peroxidation(inhibition of peroxyl radicals), xanthine oxidase, andlipoxygenase, and identification of antioxidant compounds. Levels of different compounds with antioxidant propertiesdemonstrated the presence of more tocopherols thanpolyphenol carboxylic acids and flavones. HPLC showedthat T. melanosporum extracts had high correlation valuesbetween levels of different active compounds and antioxidantassay results. Tocopherol levels were highly correlated (R2=0.867) with anti-inflammatory activities and inhibition oflipid peroxidation. Fluidized bed ethanol extracts fromdried mushroom fruit bodies can be a source of productsrich in tocopherols, and can constitute an important ingredientin food supplements.
Elasto-plastic behaviour of perforated steel plates subjected to compression and bending
Emanuele Maiorana,Carlo Pellegrino,Claudio Modena 국제구조공학회 2011 Steel and Composite Structures, An International J Vol.11 No.2
The aim of this work is to provide some insights into the elasto-plastic behaviour of plate girder web square and rectangular panels with centred and eccentric holes under both compression and in-plane bending moment. The numerical study was validated comparing the numerical results obtained for one simple steel plate configuration with the corresponding experimental results, obtained at the University of Padova, observing the influence of the initial out-of-plane imperfections on the force vs. displacement relationship and ultimate strength. Once validated the numerical approach, the effect of bending moment on the stability of the plate is studied and some differences with respect to the uniform compression load case are shown. The influence of dimension and position of the hole, the plate aspect ratio and the steel grade on elasto-plastic behaviour is observed. Some indications regarding the critical slenderness (at which transition from elastic to plastic collapse occurs) are given for square and rectangular plates with symmetric and eccentric holes having small, medium and large diameter.