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Numerical Cavitation Intensity on a Hydrofoil for 3D Homogeneous Unsteady Viscous Flows
Christophe Leclercq,Antoine Archer,Regiane Fortes-Patella,Fabien Cerru 한국유체기계학회 2017 International journal of fluid machinery and syste Vol.10 No.3
The cavitation erosion remains an industrial issue for many applications. This paper deals with the cavitation intensity, which can be described as the fluid mechanical loading leading to cavitation damage. The estimation of this quantity is a challenging problem both in terms of modeling the cavitating flow and predicting the erosion due to cavitation. For this purpose, a numerical methodology was proposed to estimate cavitation intensity from 3D unsteady cavitating flow simulations. CFD calculations were carried out using Code_Saturne, which enables U-RANS equations resolution for a homogeneous fluid mixture using the Merkle"s model, coupled to a - turbulence model with the Reboud"s correction. A post-process cavitation intensity prediction model was developed based on pressure and void fraction derivatives. This model is applied on a flow around a hydrofoil using different physical (inlet velocities) and numerical (meshes and time steps) parameters. The article presents the cavitation intensity model as well as the comparison of this model with experimental results. The numerical predictions of cavitation damage are in good agreement with experimental results obtained by pitting test.
Management of Biliopancreatic Limb Bleeding after Roux-en-Y Gastric Bypass: A Case Report
Christophe Riquoir,Luis Antonio Díaz,David Chiliquinga,Roberto Candia,Fernando Pimentel,Alex Arenas 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.5
The Roux-en-Y gastric bypass is one of the most extensive surgical treatments for obesity. The treatment of upper gastrointestinalbleeding after Roux-en-Y gastric bypass is complex due to the difficulty of accessing the excluded gastric antrum and duodenal bulb. There is no consensus regarding the management of this complication. While various techniques have been described to accessthe biliopancreatic limb, double-balloon enteroscopy is the most commonly used. If double-balloon enteroscopy is unavailable, apediatric colonoscope may be used as an alternative; however, its use in such cases has not been described. We report the case of a50-year-old male patient who underwent gastric bypass 13 years ago and was admitted for a second episode of upper gastrointestinalbleeding. The initial approach using upper endoscopy, colonoscopy, and abdominal computed tomography angiography did notreveal the cause of gastrointestinal hemorrhage; therefore, an endoscopic study of the biliopancreatic limb was performed using apediatric colonoscope. A Forrest Ib ulcer was found in the duodenal bulb, and endoscopic therapy was administered. The evolutionwas found to be satisfactory.
Christophe Dargère 고려대학교 응용문화연구소 2019 에피스테메 Vol.0 No.22
During the First World War, several billion French letters and postcards were sent on both sides of the front. Politicians and the military headquarters quickly realized the determining influence of letters on the troops’ morale. Communication analysis of the function of these written messages from this perspective seems relevant for at least four reasons: to describe the front as an ethnographic study of the war; to recount the horror of war as a therapeutic release; to study the letters as a means of circulating information between the front and the rear; and to capture these communication exchanges as organizational vectors between the front and the rear. Au cours de la première guerre mondiale, plusieurs milliards de lettres et cartes postales françaises ont été envoyées de part et d’autres du front. Les responsables politiques, ainsi que les Etats-Majors français ont vite compris l’influence déterminante des courriers sur le moral des troupes. L’analyse communicationnelle de la fonction de ces écrits, partant de ce constat semble pertinente pour au moins quatre raisons : décrire le front comme consignation ethnographique de la guerre ; raconter l’horreur pour une libération thérapeutique ; étudier les lettres comme processus de circulation des informations entre le front et l’arrière ; saisir ces échanges communicationnels comme vecteurs organisationnels entre le front et l’arrière.
Christophe H. Schilling,Radhakrishnan Mahadevan,Anthony P. Burgard,Iman Famili,Steve Van Dien 한국생물공학회 2005 Biotechnology and Bioprocess Engineering Vol.10 No.5
Increasing numbers of value added chemicals are being produced using microbial fermentation strategies. Computational modeling and simulation of microbial metabolism is rapidly becoming an enabling technology that is driving a new paradigm to accelerate the bioprocess development cycle. In particular, constraint-based modeling and the development of genome-scale models of industrial microbes are finding increasing utility across many phases of the bioprocess development workflow. Herein, we review and discuss the requirements and trends in the industrial application of this technology as we build toward integrated computational/experimental platforms for bioprocess engineering. Specifically we cover the following topics: (1) genome-scale models as genetically and biochemically consistent representations of metabolic networks; (2) the ability of these models to predict, assess, and interpret metabolic physiology and flux states of metabolism; (3) the model-guided integrative analysis of high throughput ‘omics’ data; (4) the reconciliation and analysis of on- and off-line fermentation data as well as flux tracing data; (5) model-aided strain design strategies and the integration of calculated biotransformation routes; and (6) control and optimization of the fermentation processes. Collectively, constraint-based modeling strategies are impacting the iterative characterization of metabolic flux states throughout the bioprocess development cycle, while also driving metabolic engineering strategies and fermentation optimization.
Christophe Theys,Ryoo, Dong Keun,Theo Notteboom Jungseok Research Institute of International Logis 2008 JOURNAL OF INTERNATIONAL LOGISTICS AND TRADE Vol.6 No.2
This paper presents a generic framework on port logistics development and its interaction with hinterland regions. Although earlier work on the topic (e.g. by Ferrari et al., 2006; Kuipers and Eenhuizen, 2004) offers valuable insights in the subject, it contains limitations in geographical applicability. Ports indeed face dissimilarities in, for instance, locational characteristics (a.o. distance from the sea and nautical accessibility) and hinterland connections. Only when a model for determining seaport-located logistics activities takes into account these issues of dissimilarity among ports, the framework could be applied to a variety of seaport ranges worldwide. In this paper we aim to provide a first version of such a framework. More particularly, by means of a survey conducted in the Port of Busan the shortcomings of traditional approaches are illustrated. We then propose a more encompassing model, which seems to explain fairly well the attractiveness of Busan in terms of logistics activities. This framework explicitly adds port and hinterland characteristics to the list of factors decisive in the choice of the location of logistics activities. Finally, we would like to remark that our research on this topic is still ongoing and results for surveys planned in New York and Antwerp will be reported in a later stage.
A Populist Twist : Multiculturalism Turned Against Itself
Christophe Gaudin 미래사회통합연구센터 2018 Journal of Conflict and Integration Vol.2 No.2
The intent of this paper is to investigate two distinct aspects of multiculturalism: the main reasons for its popularity on the one hand, the way it has come unwillingly to fuel populist movements in the last years on the other hand. It argues that its advocating a right for every community not to be hurt in their beliefs provided an unexpectedly shaky foundation to address subsequent movements based on popular anger.