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| Heral, Maurice. |
| The indigenous oyster of mainland France, the fiat oyster, Ostrea edulis has been part of the human diet for centuries. The Romans collected them and exported them to Rome. Although tanks for holding oysters after harvesting were in use at that time (GreIon 1978) it seems that true culture was not developed along the coast contrary to the records of Pliny the Older. It appears that oysters were already being captured on hoards off the Italian coast. The exploitation of natural stocks continued through the Middle Ages and the Renaissance. However, it was not until the 17th century that oyster culture began, first in the pools of the salt marshes of the Atlantic coast and then in specially managed ponds. Papy (1941) repeats a good description given in 1688... |
| Tipo: Text |
Palavras-chave: Rearing; Diseases; Analytical model; Overall model; Cultured stocks; Energetics; Reproduction; Nutrition; Physiology; France; Culture; Oyster. |
| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/1989/publication-3039.pdf |
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| Ghoreishi, Seyed Reza; Davies, Peter; Cartraud, Patrice; Messager, Tanguy. |
| In part I of this study it was shown that, to model synthetic fiber ropes, two scale transition models can be used in sequence. The first model (continuum model) has been presented in the part I and the present paper examines the behavior of a fibrous structure consisting of 6 helicoidal strands around a central core (1 + 6 structure). An analytical model will be presented which enables the global elastic behavior of such a cable under tension-torsion loading to be predicted. In this model, first, the core and the strands are described as Kirchhoff-Love beams and then the traction-torsion coupling behavior is taken into account for both of them. By modeling the contact conditions between the strands and the core, with certain assumptions, it is possible to... |
| Tipo: Text |
Palavras-chave: Testing; Analytical model; Aramid; Wire; Simple strand; Fiber rope. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2596.pdf |
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| Ghoreishi, Seyed Reza; Cartraud, Patrice; Davies, Peter; Messager, Tanguy. |
| Synthetic fiber ropes are characterized by a very complex architecture and a hierarchical structure. Considering the fiber rope architecture, to pass from fiber to rope structure behavior, two scale transition models are necessary, used in sequence: one is devoted to an assembly of a large number of twisted components (multilayered), whereas the second is suitable for a structure with a central straight core and six helical wires (1 + 6). The part I of this paper first describes the development of a model for the static behavior of a fibrous structure with a large number of twisted components. Tests were then performed on two different structures subjected to axial loads. Using the model presented here the axial stiffness of the structures has been... |
| Tipo: Text |
Palavras-chave: Testing; Analytical model; Multilayered structures; Aramid; Yarn; Fiber rope. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2595.pdf |
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| Heral, Maurice. |
| In areas where oyster or mussel culture is very intensive, declines of growth rate and decreases of survival rate have occurred. For these reasons, plans have been proposed to regulate the cultivated biomasses in order to fit the carrying capacity of the different ecosystems (Heral et al 1990; Heral, 1991). In areas where new aquaculture of molluscs is beginning, oyster or mussel farmers need to know how large the extension of the culture could be and what the maximal densities should be in order to obtain the maximum economic benefit. Furthermore, as mollusc cultures are developed in coastal areas, they are very susceptible to changes in environmental conditions that can modify trophic relationships, or directly reduce growth rate, physiological... |
| Tipo: Text |
Palavras-chave: Oyster model; Analytical model; Bivalve molluscs culture; Models. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/1993/publication-6104.PDF |
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| Ayet, Alex; Redelsperger, Jean-luc. |
| We present an analytical model reproducing literature‐based numerical simulations of the Marine Atmospheric Boundary Layer (MABL) over a SST front, with wind blowing from the cold to the warm side. Turbulence is parameterised through a varying diffusion coefficient with two critical features: it is parabolic on the vertical and its mean value is decoupled from the MABL height (unlike an Ekman layer model). These two novel features are found essential to recover the internal structure of the MABL from numerical simulations. Different dynamical regimes are obtained and interpreted in terms of non‐dimensional numbers characterising the relative importance of terms driving the momentum equation. A closed‐form expression of the vertically integrated wind... |
| Tipo: Text |
Palavras-chave: Air-sea interaction; Analytical model; Boundary-layer flow; SST front. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00501/61230/64808.pdf |
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| Ghoreishi, S; Messager, T; Cartraud, P; Davies, Peter. |
| In the field of cable modeling, many models have been proposed to describe the mechanical behavior of simple straight strands under axial loading, and the predictions of these models have been compared to experimental data when available. However, the validity domain of these models has not been evaluated yet because the experimental results reported in the literature are very limited. This problem is addressed here, the results from nine linear elastic models of a 6 + 1 wire single layered strand (simple straight strand) subjected to static axial loads being compared with values from 3D finite element modeling. The analytical models are shown to give satisfactory estimations of the elastic stiffness constants for lay angles below 20 degrees. (C) 2007... |
| Tipo: Text |
Palavras-chave: Finite element; Analytical model; Wire; Strand; Cable. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-4206.pdf |
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