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Ship maneuvering prediction based on virtual captive model test and system dynamics approaches

Journal of Hydrodynamics 2022年第2期34卷 259-276页

作者： Peng Du Lu Cheng Zi-jian Tang A.Ouahsine Hai-bao Hu y.hoarau Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen518057China School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an710072China Laboratoire Roberval UT Compiègne-Sorbonne UniversitéCompiègneFrance ICUBE Laboratory University of StrasbourgStrasbourgFrance

The maneuvering simulation is carried out through the continuous captive model test and the system dynamics *** mathematical maneuvering group(MMG)model is implemented in the virtual captive model tests by using the computational fluid dynamics(CFD)*** oblique towing test(OTT),the circular motion test(CMT),the rudder force test and the open water test are performed to obtain the hydrodynamic derivatives of the hull,the rudder and the propeller,and the results are validated by experimental *** designing the tests,the number of cases is reduced to a low level,to allow us to evaluate the maneuverability with a low cost and in a short *** these obtained coefficients,the system-based maneuvering simulations are conducted to calculate the position and the attitude of the ship,with results in agreement with the free running test *** procedure can also be used for other hull forms,with reduced workload and with convenience for maneuvering simulation tasks.

关键词： Maneuvering simulation captive model test(CMT) system dynamics computational fluid dynamics(CFD) Hydrodynamic derivatives

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Potential Use of Essentials Oils to Control Fruitlet Core Rot (FCR) in Pineapple (Queen Victoria Variety) in Reunion Island

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American Journal of Plant Sciences 2020年第11期11卷 1671-1681页

作者： Marc Chillet Angélique Hoareau Mathilde hoarau Jérome Minier CIRAD UMR QUALISUD 7 Chemin de l’IRAT 97410 Saint Pierre Ile de la Réunion France QUALISUD Univ. Montpellier CIRAD Montpellier SupAgro Univ. d’Avignon Univ. de la Réunion Montpellier France

Fruitlet Core Rot (FCR) is one of the major postharvest diseases of pineapple (Ananas comosus var. comosus), especially on the prone variety Queen Victoria cultivated in Reunion Island. This aggressive disease is generally due to two pathogens: Fusarium ananatum and Thalaromyces stolii, and needs to be controlled during postharvest. In Reunion Island, F. ananatum is the principal causal agent impacting fruit exportation. Fruit produced for the export market is generally treated with chemicals. This type of postharvest treatment is not in line with consumer expectations, as consumers prefer fruits treated with nonharmful and natural products. The objective of this work was to study alternative postharvest treatments using the fungitoxic properties of essential oils and their ability to elicit the resistance mechanisms of the fruit. Six EAs were tested in vitro on mycelial growth of F. ananatum. Whether by volatilization or included in the culture medium, some essential oils such as thymol, eugenol, geraniol and the carvone/menthol mixture have a strong fungistatic effect. But only thymol has a fungitoxic effect. The thymol, a natural molecule synthesized by thyme (Thymus vulgaris L. thymoliferumyl

关键词： Essential Oils Fruitlet Core Rot Pineapple Postharvest Treatment Thymol

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Optimisation of the Postharvest Treatment with Thymol to Control Mango Anthracnose

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American Journal of Plant Sciences 2020年第8期11卷 1235-1246页

作者： Marc Chillet Jérome Minier Mathilde hoarau Jean-Christophe Meile CIRAD UMR QUALISUD 7 Chemin de l’IRAT Ligne Paradis Saint Pierre Ile de La Réunion France QUALISUD Université de Montpellier CIRAD Université de la Réunion Montpellier SupAgro Université d’Avignon et des Pays de Vaucluse Montpellier France

Anthracnose, caused by the fungus called Colletotrichum gloeosporioides, is the main postharvest disease that affects mango production on Reunion Island. Fruits for the export market are always treated with chemicals. The use of chemical treatment is not in adequation with consumer expectations, and the increasing emergence of fungicide-resistant isolates promotes the development of alternatives methods. The principal objective of this work was to use antimicrobial properties of thymol as an alternative postharvest treatment on mango. Thymol diluated in a penetrating agent solution was effective on mango anthracnose. At a concentration of 0.025%, Thymol limited necrosis development due to pathogens during fruit storage. This treatment can stimulate some of polyphenols biosynthesis involved in the fruit resistance to postharvest disease, particularly thesynthesis of gallic acid and resorcinol. With this final concentration of 0.025% thymol, the treatment did not affect fruit maturation and quality, especially the peel colour and sugar content. Importantly, the treatment did not show any detectable effect on organoleptic qualities of the fruit.

关键词： Mango Mangifera indica Anthracnose Colletotrichum gloeosporioides Biological Control Phenolic Compound Thymol

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