SUSTAINABILITY INTO LUXURY GEMSTONE INDUSTRY

Florent Vincent,Ivan Coste-Maniere,Shubham Ramchandra Patil 글로벌지식마케팅경영학회 2021 Global Fashion Management Conference Vol.2021 No.11

Production of jet-fuel-range olefins via catalytic conversion of pentene and hexene over mesoporous Al-SBA-15 catalyst

Florent Dubray,Vladimir Paunovic,Marco Ranocchiari,Jeroen A. van Bokhoven 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-

The oligomerization of biomass-derived light olefins offers a promising potential for the synthesis of sustainablejet-fuels, which mostly comprise C10-C18 hydrocarbons. However, the selectivity control ofoligomerization reaction remains a challenge. In this contribution, oligomerization of pentene and hexenemixtures was studied over acidic mesoporous Al–SBA–15 catalyst in continuous operation, and theimpact of different process parameters on conversion and selectivity is thoroughly evaluated. Kineticsevaluation showed that the reactivity of pentene is higher than that of hexene. Selectivity to jet-fuelrange products > 98 % were achievable at low-to-moderate conversions (<50 %), while higher conversions(ca. 90 %) resulted in selectivities of ca. 75 %. Notably, the product distribution at iso-conversion wasunaffected by temperature, pressure, and weight hourly space velocity, implicating that adjusting theconversion is the primary way to tune the selectivity of the Al-SBA-15 catalyst. This understanding ofthe oligomerization process opens the door for the research devoted on the oligomerization of complexolefin mixtures, mimicking the process stream of olefins production units, in order to achieve ‘‘biomass tojet-fuel” transformation.

A Systematic Comparison of Simulation Software for Robotic Arm Manipulation using ROS2

Florent P. Audonnet,Andrew Hamilton,Gerardo Aragon-Camarasa 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11

Simulation software is a powerful tool for robotics research, allowing the virtual representation of the real world. However, with the rise of the Robot Operating System (ROS), there are new simulation software packages that have not been compared within the literature. This paper proposes a systematic review of simulation software compatible with ROS version 2. The focus is research in robotics arm manipulation as it represents the most often used robotic application in industry and their future applicability to digital twins. For this, we thus benchmark simulation software under similar parameters, tasks and scenarios and evaluate them in terms of their capability for long-term operations, success at completing a task, repeatability and resource usage. We find that there is no best simulation software overall. Still, two simulation packages (Ignition and Webots) have higher stability than others while, in terms of resource usage, PyBullet and Coppeliasim consume less than their competitors.

Hy-HIL : new test platform for the development of hybrid vehicle

Florent PEREZ Ing,Stephane PELLETIER 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11

D2T, RENAULT, IFP, LMS and G2ELAB launched together the HyHIL project, a new test platform for the development of hybrid vehicles. HyHIL uses a suite of generic tools, such as D2T’s MORPHEE 2 automation system, to reproduce and assess the complex architecture of hybrid vehicles in a unique and flexible way. Combining an IC engine with an electric motor is complex: it increases the number of parameters to be calibrated during the development. This means increased time and cost, while the market demand is asking for their reduction. HyHIL helps to solve this problem by defining the best architecture of a hybrid powertrain at the early stages of development. The platform evaluates hybrid powertrain concepts and the benefits of different levels of hybridization in an engine test bed, thanks to real-time simulations developed with LMS’ AMESim simulation platform and executed by D2T’s MORPHEE 2 automation system. MORPHEE 2 executes real time models required to simulate both hybrid vehicle and driver. The MORPHEE 2 flexibility allows switching easily between the three hybrid architectures retained for this project: - "Pure thermal" mode, with simulation of an alternator-starter. - "Stop & Start" mode, with simulation of the engine’s frequent stop/start phases. - "Hybrid" mode, with simulation of electric propulsion, energy recovery during deceleration phases and battery recharging. These architectures have been tested over several standard driving cycles (NEDC, FTP, Artemis, etc.) using an energy supervisor developed by IFP which is sufficiently generic not to require specific calibration. The results obtained on the engine test bed were compared to results obtained on a real vehicle; the simulation proved to be a very realistic representation. Simulation, with the use of an environment such as AMESim and MORPHEE 2, offers a real way to assess complex powertrains without the need to manufacture the powertrain or even the complete car.

R. S. WebTool, a web server for random sampling-based significance evaluation of pairwise distances

Villiers, Florent,Bastien, Olivier,Kwak, June M. Oxford University Press 2014 Nucleic acids research Vol.42 No.w1

<P>Pairwise comparison of data vectors represents a large part of computational biology, especially with the continuous increase in genome-wide approaches yielding more information from more biological samples simultaneously. Gene clustering for function prediction as well as analyses of signalling pathways and the time-dependent dynamics of a system are common biological approaches that often rely on large dataset comparison. Different metrics can be used to evaluate the similarity between entities to be compared, such as correlation coefficients and distances. While the latter offers a more flexible way of measuring potential biological relationships between datasets, the significance of any given distance is highly dependent on the dataset and cannot be easily determined. Monte Carlo methods are robust approaches for evaluating the significance of distance values by multiple random permutations of the dataset followed by distance calculation. We have developed R. S. WebTool (http://rswebtool.kwaklab.org), a user-friendly online server for random sampling-based evaluation of distance significances that features an array of visualization and analysis tools to help non-bioinformaticist users extract significant relationships from random noise in distance-based dataset analyses.</P>

초단 펄스 (Ultra Short Pulse)레이저를 이용한 절단 어플이케이션

Joris VanNunen,Florent Thibault 한국레이저가공학회 2017 Laser Solutions Vol.20 No.5

Shoot and root responses of woody species to silvicultural management for afforestation of degraded croplands in the Sudano-Sahelian zone of Benin

Noulè,koun, Florent,Lamers, John P.A.,Naab, Jesse,Khamzina, Asia Elsevier Scientific Pub.Co 2017 Forest ecology and management Vol.385 No.-

<P><B>Abstract</B></P> <P>In the Sudano-Sahelian zone of West Africa, where deforestation and cropland soil degradation occur at alarming rates, the (re-)introduction of trees on degraded lands can improve and sustain farming systems and landscapes. The shoot and root morphological traits of five woody species introduced to degraded cropland were assessed with a particular focus on the survival, early establishment and growth of saplings subjected to manuring (1kg per plant) and drip irrigation (0.5L of water per plant per day). Functional traits of the woody above- and belowground organs of field-grown plants were monitored for the first 15months after planting, covering two growing (rainy) seasons and one dry season. The high survival rate (>60%), combined with a very low incidence rate (<1%), for all species was evidence of successful establishment overall. The highest survival rates (94–100%) were observed in <I>Jatropha curcas</I> L., <I>Leucaena leucocephala</I> Lam. and <I>Moringa oleifera</I> Lam. The mortality rate of the most drought-sensitive species <I>Parkia biglobosa</I> Jacq. could be reduced ten-fold through supplemental irrigation during the dry season. The fast-growing <I>L. leucocephala</I>, <I>M. oleifera</I> and <I>J. curcas</I> had higher values for shoot-level traits than did the slow-growing <I>Anacardium occidentale</I> L. and <I>P. biglobosa</I>. Fertilization and irrigation enhanced the shoot growth of both the fast and slow growers during the dry and growing seasons. In contrast, belowground development was either increased or reduced by fertilization and irrigation during the growing and dry seasons, but the slow growers demonstrated a more plastic response to these treatments than did the fast growers. Among the studied traits, the relative growth rate of plant as a whole (i.e. shoots and roots combined) exhibited the greatest plastic response to resource availability, thus suggesting its application in screening candidate species for afforestation efforts. Overall, the five studied species were considered suitable for the afforestation of degraded croplands, while the early growth and establishment of saplings could be boosted by irrigation and a supply of manure.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The response of fast-growing species to manuring was pronounced in shoots. </LI> <LI> Slow growers invested more in developing roots rather than developing shoots. </LI> <LI> In the presence of water scarcity, slow growers performed better than fast growers. </LI> <LI> Relative growth rate was the most indicative measure of species suitability for afforestation. </LI> </UL> </P>

Surface Based Techniques for Analysis of Gradient Structured Nanoparticles

Victoria L. TEO,Florent JASINSKI,Monique MBALLA MBALLA,Richard BRINKHUIS,Stuart C. THICKETT,William WEAVER,Per B. ZETTERLUND 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.2

Molecular Origin and Electrochemical Influence of Capacitive Surface States on Iron Oxide Photoanodes

Hu, Yelin,Boudoire, Florent,Hermann-Geppert, Iris,Bogdanoff, Peter,Tsekouras, George,Mun, Bongjin Simon,Fortunato, Giuseppino,Graetzel, Michael,Braun, Artur American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.6

<P>The origin, the nature, and the electronic structure of surface defects causing surface states on metal oxides and their role in solar water splitting have been under scrutiny for several decades. In the present study, the surface of hematite films is treated with an oxygen plasma and then subject to a detailed investigation with electroanalytical methods and element orbital specific X-ray spectroscopy. We observe a systemic variation of photoelectrochemical properties with oxygen treatment time. Fe 2p and O is core level X-ray photoelectron spectra and resonant valence band photoemission at the Fe 3p edge reveal the filling of prevalent oxygen vacancies with concomitant oxidation of Fe2+ to Fe3+ upon the oxygen treatment. The dc bias dependent impedance spectra confirm how a prevalent capacitive surface state, which evolves parallel with the photocurrent onset potential, becomes diminished upon oxygen treatment. Surface states of iron induce higher reactivity toward water oxidation than oxygen surface states. correlation between oxygen vacancy filling, concentration of surface states, and photocurrent density in the course of treatment confirms that the surface defects are of a capacitive nature and that the onset of water splitting can be considered as a result of dielectric breakdown in an interfacial hydroxide layer between photoanode and water.</P>

BIM 기술을 이용한 공조덕트 최적 설계 기법

김민기(Min Gi Kim),Florent Schmidt,정민호(Min Ho Chung) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6

본 연구에서는 BIM 기술을 활용한 공조덕트의 최적 설계기법을 고찰하고, 프로그램으로 작성하여 실제 건축 프로세스에 활용하는 방안을 도출하였다. 기존 공조덕트의 해석방법은 경험에 의존하거나, 간략화된 식을 이용하여 계산하므로 해석 결과의 정확도가 상대적으로 낮아 실제 시공 후 유량 밸런싱의 문제가 발생하거나 소음발생의 원인이 될 수 있었다. 본 연구에서는 Darcy-Weisbach 식을 이용하여 보다 정확한 결과를 얻는 동시에 BIM 기술에 접목하여 해석 프로세스에서 발생하는 문제점을 개선하고자 하였다. BIM 기술을 활용한 건축 프로세스는 디지털화된 정보가 단일 프로젝트 내에 축적되므로 정보간의 유기적인 결합 측면에서 유리하다. 이를 이용하여 BIM 모델 생성 시 도출된 정보를 활용하는 한편, 해석에 필요하지만 입력되지 않은 정보를 추가하여 공조덕트에 대한 해석이 가능한 프로그램을 제작하였다.