A Compatible Single-Phase/Two-Phase Numerical Model: 2. Application to a Coastal Aquifer in Mexico   总被引：5，自引：0，他引：5  

Alfonso Rivera  Emmanuel Ledoux  Serge Sauvagnac 《Ground water》1990,28(2):215-223

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Responding to unmet food needs of displaced persons or refugees:     

Nebasina Emmanuel Ngwa Dr. 《GeoJournal》1992,27(4):323-330

This paper identifies two types of displaced persons in two different ecological zones in Cameroon as a result of two major causes; a poisonous lake gas explosion in the North West and the effects of a civil war in Chad on Kousseri town in North Cameroon. The displaced persons, through no fault of theirs had to look up to both international and local donor organizations for assistance. This paper addresses the usual unmet food needs, analyses some of the performances that often go wrong but which can be corrected. The paper points out that donor agencies and the host government played major roles in raising food, cash, etc. but regrets to note that unsurmountable logistical problems, improper choice and use of personnel with wider expertise to handle specialized problems, inexistent buffer stocks and non-involvement of the displaced persons in managing some of the problems hindered hard-generated resources from reaching most of the beneficiaries. Better performances lie in reducing dependency on continuous external supplies and also in the local hosts allowing room for small scale agro-pastoral productions which should satisfy and even improve on the unmet nutritional difficiencies and rations of the displaced persons.  相似文献   

Structures and tectonic evolution of the external zone of Alpine Corsica     

Emmanuel Egal   《Journal of Structural Geology》1992,14(10)

This paper presents a structural analysis of the external zone of Alpine Corsica, including the autochthonous domain and overlying external nappes (Santa Lucia and Balagne nappes). Two stages of nappe emplacement are identified occurring prior to and after the deposition of the Eocene sediments which were laid down upon first generation thrust contacts but are imbricated with their composite (continental and ophiolitic) basement by second generation thrusts. Five generations of structures with regional extent have been distinguished. However, the first generation has not been recognized within the visible part of the autochthon domain.Eoalpine first generation structures, restricted to allochthonous units, and Late Eocene to Early Oligocene second generation structures were nearly contemporaneous with the two stages of thrusting. The precise significance of E-W third generation structures is poorly understood. Broadly N-S fourth generation structures resulted from Oligocene compressive tectonics (folding and local backthrusting). Finally, fifth generation structures were generated during a Miocene extensional stage.These results are partly consistent with structural features previously reported in the southern and the northern outcrops of the Schistes lustrés, i.e. the main part of the allochthonous domain. A summary of a regional tectonic evolution is thus proposed for Alpine Corsica from Eoalpine obduction to Miocene extension.  相似文献   

Experience of produced water treatment in the North Sea     

Luc Riviere  Emmanuel Garland 《Marine pollution bulletin》1994,29(6-12):312-316

This paper describes the experience of the Elf company regarding produced water treatment and disposal in the North Sea. It focuses on three fields where difficulties were faced: it evaluates the various treatment techniques used (plate separators, hydrocyclones, vapour stripping units, injection into a disposal well), the reasons for the problems encountered during the life of these fields and the efforts made to obtain a satisfactory quality of the produced water discharged. The contribution of recent or new technologies put on the market is discussed. It shows that, because of the nature of the effluents to be treated, and the fact that produced water characteristics depend largely on upstream treatment and processes, it is still very difficult to anticipate the correct design of an installation or to extrapolate from laboratory tests. For these reasons and others, the improvement of performance requires extensive effort by operators, process and design engineers in order to improve the quality of effluent discharged. Finally, it expounds the limits of the efforts made by industry to reduce the quantity of hydrocarbons released into the sea or to comply with present regulations. It emphasizes that not only costs are to be taken into account but also the adverse consequences of a further reduction of the limit for discharges, if this should happen. Such a measure would to the use of techniques which, in many cases, would increase the total impact of the produced water treatment and the human risk.  相似文献   

Design charts for a deep circular tunnel under non-uniform loading     

Emmanuel Detournay  Christopher M. St. John 《Rock Mechanics and Rock Engineering》1988,21(2):119-137

Summary This paper describes design charts which can be used to quickly predict the size and shape of the failed rock regions caused by the excavation of a deep tunnel, and the induced closure for cases of non-uniformin-situ stress fields. Through a simple graphical construction, the design charts can also be used to evaluate the performance of a support system.Previously of J. F. T. Agapito and Associates, U.S.A.  相似文献   

Book review     

C. B. Emmanuel 《Boundary-Layer Meteorology》1976,10(2):251-251

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Drag and bulk aerodynamic coefficients over shallow water     

C. B. Emmanuel 《Boundary-Layer Meteorology》1975,8(3-4):465-474

From direct measurements of the vertical turbulent fluxes of momentum, heat, and water vapor over shallow water, the drag and bulk aerodynamic coefficients are computed and compared with those obtained via the profile technique. The results show thatC _D =C _T =C _E =1.2×10^?3, with variability among their mean values being ? 20 %. All measurements were taken at 8 m above the water surface at Lake Hefner, Oklahoma. The measurement platform was a rectangular tower located within the lake and approximately 1 km from the nearest shore. The depth of the lake at the tower was 8 m.  相似文献   

A simple non-linear model for the investigation of the effects of the gap closure at the abutment joints of short bridges     

Emmanuel A. Maragakis  Greg Thornton  Mehdi Saiidi  Raj Siddharthan 《地震工程与结构动力学》1989,18(8):1163-1178

Closure of the gap at the abutment joints of bridges has been the source of extensive damage during the 1971 San Fernando and more recent earthquakes. In this paper a model for the investigation of the effects of this gap closure is presented and analysed. The focus of the model is the representation of the non-linear response of the bridge abutments, the foundation and the columns. The model is used for the investigation of the response of a short bridge located in California.  相似文献   

Microfaunes et microfacies du Crétacé supérieur de l'extremité occidentale de l'Hindou Kouch (Afghanistan)     

Emmanuel Bouyx  J. M. Villain 《Cretaceous Research》1986,7(4)

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Elastoplastic model of a deep tunnel for a rock with variable dilatancy     

Emmanuel Detournay 《Rock Mechanics and Rock Engineering》1986,19(2):99-108

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