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Christian Mille,Jérôme Munzinger,Hervé Jourdan 한국응용곤충학회 2012 Journal of Asia-Pacific Entomology Vol.15 No.2
We recorded the Australian guava moth for the first time in New Caledonia. Given its biology and recent spread into New Zealand, this moth may be a pest risk for many fruit crops and native plant species if it is proved to have been introduced in New Caledonia. Indeed, this record challenges our capabilities to identify insect interceptions in the context of a high gap of taxonomic knowledge in New Caledonia. It also urges high endemism islands to implement early detection protocols to prevent establishment and spread of new invasive species.
Thermo-oxidation behaviour of organic matrix composite materials at high temperatures
Cinquin, Jacques,Colin, Xavier,Fayolle, Bruno,Mille, Marion,Terekhina, Svetlana,Chocinski-Arnault, Laurence,Gigliotti, Marco,Grandidier, Jean-Claude,Lafarie-Frenot, Marie-Christine,Minervino, Matteo,C Techno-Press 2016 Advances in aircraft and spacecraft science Vol.3 No.2
The present paper is a review of the main activities carried out within the context of the COMPTINN' program, a joint research project founded by a FUI program (Fonds $Unifi{\acute{e}}s$ $Interminist{\acute{e}}riels$) in which four research teams focused on the thermo-oxidation behaviour of HTS-TACTIX carbon-epoxy composite at 'high' temperatures ($120^{\circ}C-180^{\circ}C$). The scientific aim of the COMPTINN' program was to better identify, with a multi-scale approach, the link between the physico-chemical mechanisms involved in thermo-oxidation phenomena, and to provide theoretical and numerical tools for predicting the mechanical behaviour of aged composite materials including damage onset and development.
ESCAPE OF RESONANTLY SCATTERED LYβ AND Hα FROM HOT AND OPTICALLY THICK MEDIA
장석준,이희원,안상현,이호규,Rodolfo Angeloni,Tali Palma,Francesco Di Mille 한국천문학회 2018 Journal of The Korean Astronomical Society Vol.51 No.1
We investigate the escape of Ly$\beta$ from emission nebulae with a significant population of excited hydrogen atoms in the level $n=2$, rendering them optically thick in H$\alpha$. The transfer of Ly$\beta$ line photons in these optically thick regions is complicated by the presence of another scattering channel leading to re-emission of H$\alpha$, alternating their identities between Ly$\beta$ and H$\alpha$. In this work, we develop a Monte Carlo code to simulate the transfer of Ly$\beta$ line photons incorporating the scattering channel into H$\alpha$. Both H$\alpha$ and Ly$\beta$ lines are formed through diffusion in frequency space, where a line photon enters the wing regime after a fairly large number of resonance scatterings with hydrogen atoms. Various line profiles of H$\alpha$ and Ly$\beta$ emergent from our model nebulae are presented. It is argued that the electron temperature is a critical parameter which controls the flux ratio of emergent Ly$\beta$ and H$\alpha$. Specifically for $T=3 \times 10^4{\rm\ K}$ and H$\alpha$ line center optical depth $\tau_\alpha=10$, the number flux ratio of emergent Ly$\beta$ and H$\alpha$ is $\sim 49$ percent, which is quite significant. We propose that the leaking Ly$\beta$ can be an interesting source for the formation of H$\alpha$ wings observed in many symbiotic stars and active galactic nuclei. Similar broad H$\alpha$ wings are also expected in Ly$\alpha$ emitting halos found in the early universe, which can be potentially probed by the {\it James Webb Telescope} in the future.
Failure behavior of 2024-T3 aluminum under tension-torsion conditions
Marcos Rodríguez-Millán,Álvaro Vaz-Romero,Ángel Arias 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.11
Experimental and numerical investigations of the failure strain of aeronautical 2024-T3 aluminum were conducted. Experiments on theDouble notched tube (DNT) specimen loaded in combined tension and torsion were applied to an aluminum alloy for the first time. Numericalanalysis showed that the specimen exhibited uniformity in stress-strain as plastic strain developed. Low triaxiality values and awide range of Lode parameter values were obtained at failure conditions. The failure strain of 2024-T3 aluminum showed strong dependenceon the Lode parameter in agreement with the observations reported by other authors. The use of the DNT specimen was proven tobe efficient in calibrating the ductile failure model of aluminum alloys.
Rheology and gel point of the enzymatic hydrolysis of urea in the presence of urease
R. Serrato-Millán,L. Medina-Torres,F. Calderas,B.L. España-Sánchez,M. Estevez,A.R. Hernandez-Martínez,M. Cruz-Soto,I.C. Sánchez,R. Gómez-García,I. Sánchez-Betancourt,M.C. Velasquillo-Martínez,G. Luna- 한국유변학회 2017 Korea-Australia rheology journal Vol.29 No.1
This study reports on the rheology of the gelation kinetics of raw chitosan (CTS) solutions (2% w/v) produced by enzymatic hydrolysis of urea at different urea concentrations (40, 50, 60, 80, and 100 mM) in the presence of urease at 1 U/mL. Viscoelastic parameters and pH values were evaluated during gelation process and the rheological properties of CTS hydrogels produced were monitored after 24 h at 37°C to simulate human body temperatures. pH measurements suggest that above some critical urea concentration (50 mM) the time required (tgel) to reach the critical pH gelation shows no dependence on urea concentration (tgel was ca. 70 minutes). Above 50 mM of urea concentration, CTS hydrogels exhibit an elastic modulus G' higher than the viscous modulus G'' with no frequency dependence characteristic of a gel behavior. Gelation kinetics analyzed by rheology suggest that the G' (i.e., structure) development depends on urea concentration during solution neutralization.
Gerardo Gómez Millán,Sanna Hellsten,Alistair W.T. King,Juha-Pekka Pokki,Jordi Llorca,Herbert Sixta 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
Furfural (FUR) was produced from xylose using a biphasic batch reaction system. Water-immiscibleorganic solvents such as isophorone, 2-methyltetrahydrofuran (2-MTHF) and cyclopentyl methyl ether(CPME) were used to promptly extract FUR from the aqueous phase in order to avoid the degradation tohumins as largely as possible. The effect of time, temperature, organic solvent and organic-to-aqueousratio on xylose conversion and FUR yield were investigated in auto-catalyzed conditions. Experiments atthree temperatures (170, 190 and 210 C) were carried out in a stirred microwave-assisted batch reactor,which established the optimal conditions for achieving the highest FUR yield. The maximum FUR yieldsfrom xylose were 78 mol% when using CPME, 48 mol% using isophorone and 71 mol% in the case of 2-MTHF at an aqueous to organic phase ratio of 1:1 (v/v). Birch hydrolysate was also used to show the highfurfural yield that can be obtained in the biphasic system under optimized conditions. The present studysuggests that CPME can be used as a green and efficient extraction solvent for the conversion of xyloseinto furfural without salt addition.