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Fleury, F.,Reynouard, J.M.,Merabet, O. Techno-Press 1999 Structural Engineering and Mechanics, An Int'l Jou Vol.7 No.1
Realistic steel-concrete bond/slip relationships proposed in the literature are usually uniaxial. They are based on phenomenological theories of deformation and degradation mechanisms, and various pull-out tests. These relationships are usually implemented using different analytical methods for solving the differential equations of bond along the anchored portion, for particular situations. This paper justifies the concepts, and points out the assumptions underlying the construction and use of uniaxial bond laws. A finite element implementation is proposed using 2-D membrane elements. An application example on an interior beam-column joint illustrates the possibilities of this approach.
Hydrogen permeation characteristics of rolled V<sub>85</sub>Al<sub>10</sub>Co<sub>5</sub> alloys
Fleury, Eric,Suh, Jin-Yoo,Kim, Dong-ik,Jeong, Chan Hoon,Park, Jung Hoon Elsevier 2012 Current Applied Physics Vol.12 No.4
<P><B>Abstract</B></P><P>Thin sheets of V<SUB>85</SUB>Al<SUB>10</SUB>Co<SUB>5</SUB> alloy were produced by a thermo-mechanical treatment consisting in successive hot rolling, cold rolling steps and annealing treatment at high temperature followed by either air cooling or water quenching. Though the values of hydrogen permeability measured for these sheets were significantly reduced as a consequence of the rolling process, the annealing treatment restored almost the hydrogen permeation properties to those of the alloy in the cast condition. EBSD analyses suggested that the post-annealing treatment performed at 1100 °C for 3 min after cold rolling induced a recrystallization of the grains resulting in a preferred orientation along the {002} planes. For the sample annealed and water quenched, the value of the hydrogen flux reached about 45 ml/cm<SUP>2</SUP>.min, which is more than twice the value of the flux obtained for thin foils of Pd alloys tested under identical conditions.</P> <P><B>Highlights</B></P><P>► Thin membranes of V–Al–Co alloy have been prepared by thermo-mechanical treatment. ► The hot and cold rolled alloys were annealed at high temperature for a short time. ► The hydrogen permeability shows a dependence on the cooling rate after annealing. ► Fast cooling rates induced by water quenching enhanced the hydrogen permeability. ► The study demonstrates the effect of low angle grain boundaries on these properties.</P>
Heterogeneous nucleation of icosahedral phase from FCC phase in cast Al 87 Mn 4 Si 2 Be 7 alloy
Fleury, E.,Chang, H.-J.,Kim, D.-H. Abingdon; Taylor & Francis Ltd 2006 PHILOSOPHICAL MAGAZINE Vol.86 No.3-5
<P>The formation of the icosahedral (i) quasicrystalline phase has been studied in the cast Al 87 Mn 4 Si 2 Be 7 alloy. Under low cooling rates, i-phase particles of about 5 to 15?µm formed in the a Al matrix. A thorough examination of the microstructure revealed the existence of cubic crystalline phases embedded in the i-particles. Microstructural and thermal analyses indicated that the i-particles nucleated heterogeneously from the cubic AlMn(Si)Be 4 phases by a peritectic reaction, however with a slight misorientation.</P>
Ley-Fleury ELLA NKOGO,Christ Stone Arnaud BOPENGA BOPENGA,Franck Estimé NGOHANG,Line Edwige MENGOME,Sophie ABOUGHE ANGONE,Prosper EDOU ENGONGA 한국목재공학회 2022 목재공학 Vol.50 No.2
This study aimed to explore the biodiversity of chemical compounds found in the bark of Guibourtia tessmannii from Gabon, commonly called Kévazingo, and evaluate their anti-termite activity to determine their potential values as a source of development of anti-termite products that can be valued in the fields of fine chemicals and wood preservation. Extraction of G. tessmannii bark powders was carried out using the cold maceration method with trichloroethylene, acetone, ethanol, and water. Phytochemical screening made it possible to highlight groups of chemical families present in the extracts. Anti-termite activity was tested on the wild termites “Cubitermes sp” of the genus Isoptera. The yield of the extracts were 17.11% for the buttress and 13.42% for the height at 6 m. Phytochemical tests revealed that alkaloids, polyphenols, sterols, tannins, reducing compounds, flavonoids, saponins, and anthraquinones were present in the extracts. Results of anti-termite activity indicated that anti-termite activity varied with the different parts of the bark studied, extraction solvent, and concentration (50/50) and (25/75) of the extracts used. The extracts at 50/50 concentration showed a slightly better anti-termite activity compared to the 25/75 concentration. In addition, the buttress Kévazingo or buttress showed the strongest anti-termite activity for the aqueous extract with a survival rate of 0% after 2 days.