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Koh, Yee Kan,Lyons, Austin S.,Bae, Myung-Ho,Huang, Bin,Dorgan, Vincent E.,Cahill, David G.,Pop, Eric American Chemical Society 2016 NANO LETTERS Vol.16 No.10
<P>heat transfer across interfaces of graphene and polar dielectrics (e.g.; SiO2) could be Mediated by direct: phonon coupling, as well as electronic coupling with remote interfacial phonons (RIPs). To understand-the relative contribution of each component, we develop a new pump probe technique called voltage-modulated thermorefleetance (VMTR) to accurately measure the change-of interfacial: thermal conductance under an electrostatic field. We employed VMTR on top gates of graphene field-,effect-transistors. and find that the thermal conductance of SiO2/graphene/SiO2 interfaces increases by up to Delta G approximate to 0.8 MW M-2 K-1 under electrostatic fields of <0.2 V nm(-1). We propose two possible explanations for-the small observed Delta G. First, because the applied electrostatic field induces charge carriers in graphene, out VMTR measurements could originate from heat transfer-between the charge carriers in graphene and RIPs in SiO2. Second, the increase in heat conduction could be caused by better conformity of graphene interfaces under electrostatic pressure exerted by the induced charge carriers. Regardless of the origins of the observed Delta G, our VMTR measurements eStablish, an upper limit for heat transfer from unbiased graphene to SiO2 substrates via RIP scattering; for example, only <2% of the interfacial heat transport is facilitated' y RIP scattering even at a carrier concentration of similar to 4 X 10(12) cm(-2).</P>
Artificial intelligence approach for linking competences in nuclear field
Kuo Vincent,Filz Günther H.,Leveinen Jussi 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.1
Bridging traditional experts’ disciplinary boundaries is important for nuclear knowledge management systems. However, expert competences are often described in unstructured texts and require substantial human effort to link related competences across disciplines. The purpose of this research is to develop and evaluate a natural language processing approach, based on Latent Semantic Analysis, to enable the automatic linking of related competences across different disciplines and communities of practice. With datasets of unstructured texts as input training data, our results show that the algorithm can readily identify nuclear domain-specific semantic links between words and concepts. We discuss how our results can be utilized to generate a quantitative network of links between competences across disciplines, thus acting as an enabler for identifying and bridging communities of practice, in nuclear and beyond.
EXTRACTION OF ALGAE OIL FROM NAVICULA SP. USING DIETHYL ETHER AND HEXANE SOLVENT SYSTEM
Mark Vincent G. Manalo,Patrick Jose Andaya,Gabriel B. Borja,Ms. Rose Butaran 국제과학영재학회 2011 APEC Youth Scientist Journal Vol.3 No.-
Algae oil has been studied to be a more viable source of biofuel than crops such as corn and coconut because they have a higher energy yield per hectare used. However, inefficient and expensive extraction methods have hindered this promising biofuel from being mass produced. This study aims to efficiently extract oil from a local strain of the diatom Navicula sp. through solvent extraction. Navicula sp. procured from SEAFDEC will be cultivated under controlled laboratory conditions for 30 to 45 days. These conditions include an aquarium, lighting provided by 2 florescent lamps, water treated with saltwater solution and media for the growth and maintenance of algae. The biomass will be harvested after the said period of time, and will then be subjected to solvent extraction, first with hexane, then with diethyl ether. The amount of extracted oil will determine the distribution ratio, which will determine how wellextracted the oil was from the biomass. No algae oil was extracted using diethyl ether, resulting in a distribution ratio of 0. 5.18 mL of algae oil was extracted using hexane, resulting in a distribution ratio of 2.72. The results of the study emphasized the viability of hexane as an extraction agent in the solvent extraction of Navicula sp.
V. Antony Vincent,C. Kailasanathan,G. Ramesh,T. Maridurai,V. R. Arun Prakash 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.6
Natural fibre based sandwich composite wave absorbing structures were prepared and characterized for stealth and radome applications. The principal aim of this research was to develop a novel sandwich radar wave absorbing composite structure and evaluating their wave transmission and flexural properties. Fibres such as wool, silk, E-glass, aramid and wave absorbing foams like balsa wood, PVC and PMI were used for making wave absorbing sandwich composites. The composites were prepared using autoclave vacuum bag degassing method followed by post curing at 120 °C. The radar wave transmission characteristics were investigated using stealth radomes by partially replacing the traditional E-glass and aramid fi bre structure with a frequency selective surface (FSS) with standard parameters. The free space measurement technique was used to examine the radar wave transmission characteristics in the X-band frequency range (8.2–12.4 GHz). Three point bending test also performed to identify the fl exural strength of sandwich composite setup to ensure the bending rigidity. A highest wave transmission of 87.7% at bandwidth 0.83 GHz in − 1 dB with flexural strength of 44.2 MPa was observed for sandwich composite type 3c, which contains aramid/epoxy composite + balsa wood + silk/epoxy structure. The SEM micrographs showed highly reacted and toughness improved matrix phase for type 3c composite sandwich.
A Study on the Unsteady Aerodynamics of Projectiles in Overtaking Blast Flowfields
C.K.Muthukumaran,G.Rajesh,Vincent Lijo,Heuy Dong Kim 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
A projectile that passes through a shock wave experiences drastic changes in the aerodynamic forces. These sudden changes in the forces are attributed to the wave structures produced by the projectile-shock wave interaction. A computational study using moving grid method is performed to analyze the effect of the projectile-shock wave interaction. Cylindrical and conical projectiles have been employed to study such interactions. This sort of unsteady interaction normally takes place in overtaking blast flow fields. It is found that the overall effect of overtaking a blast wave on the unsteady aerodynamic characteristics is hardly affected by the projectile configurations. However, it is noticed that the projectile configurations do affect the unsteady flow structures and hence the drag coefficient for the conical projectile shows considerable variation from that of the cylindrical projectile. The projectile aerodynamic characteristics, when it interacts with the secondary shock wave, are analyzed. It is also observed that the change in the characteristics of the secondary shock wave during the interaction is different for different projectile configurations.
S.A. Jones,G. Laskaris,S. Vincent-Bonnieu,R. Farajzadeh,W.R. Rossen 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
We present a comparative study of foam coreflood experiments with various surfactant concentrations. Plots of apparent viscosity vs. injected gas fraction were obtained for surfactant concentrations at thecritical micelle concentration and above. Bulk foam stability was measured for all concentrations andcompared with the coreflood results. There were different responses to surfactant concentration in bulkand in corefloods. The coreflood results were matched with an implicit-texture foam model, and the dependency of themodel parameters on the surfactant concentration is discussed. Fitting the data requires relating thesurfactant concentration to the dry-out function or the limiting capillary pressure.
Hyun, Y.,Richter, R.,Vincent, C.,Martinez-Gallegos, R.,Porri, A.,Coupland, G. ELSEVIER SCIENCE B.V. AMSTERDAM 2016 DEVELOPMENTAL CELL Vol.37 No.3
Flowering is initiated in response to environmental and internal cues that are integrated at the shoot apical meristem (SAM). We show that SPL15 coordinates the basal floral promotion pathways required for flowering of Arabidopsis in non-inductive environments. SPL15 directly activates transcription of the floral regulators FUL and miR172b in the SAM during floral induction, whereas its paralog SPL9 is expressed later on the flanks of the SAM. The capacity of SPL15 to promote flowering is regulated by age through miR156, which targets SPL15 mRNA, and gibberellin (GA), which releases SPL15 from DELLAs. Furthermore, SPL15 and the MADS-box protein SOC1 cooperate to promote transcription of their target genes. SPL15 recruits RNAPII and MED18, a Mediator complex component, in a GA-dependent manner, while SOC1 facilitates active chromatin formation with the histone demethylase REF6. Thus, we present a molecular basis for assimilation of flowering signals and transcriptional control at the SAM during flowering.
Blok, Sebastiaan,Gouttebarge, Vincent,Slebus, Frans G.,Sluiter, Judith K.,Frings-Dresen, Monique H.W. Occupational Safety and Health Research Institute 2011 Safety and health at work Vol.2 No.4
Objectives: Depressive disorder (DD) is a complex disease, and the assessment of work ability in patients with DD is also complicated. The checklist depression (CDp) has recently been developed to support such work ability assessments and has been recommended for implementation in insurance medicine, starting with an analysis of the organisational and social contexts. The aim of this study was to identify the potential facilitators and barriers in the use of the CDp by insurance physicians (IPs) during work ability assessments of employees on sick leave due to DD. Methods: A qualitative research was conducted based on semi-structured interviews. The participants were IPs with at least one year of work experience in performing work ability assessments. The interviews were audiotaped, transcribed and analysed qualitatively. Results: Ten IPs (7 males, 3 females; mean 53 years) were interviewed. Important facilitators, which emerged for use of the CDp, were an oral introduction for colleagues and staff, support from management, valuing the increased transparency in work ability assessments with using the CDp, having adequate time for assessments as well as modification of the appearance (colour, plasticised form) and content (clarifying aspects of the examples) of the assessment tool. The fear of the loss of autonomy, lack of added value of the CDp, high workload, inadequate instructions and lack of time were mentioned as barriers. Conclusion: Adequate introduction to the use of CDp and the fear of the loss of autonomy of IPs need special attention in planning its implementation.