113 resultados para Yemen
Resumo:
Alexander Kohut
Resumo:
Alexander Kohut
Resumo:
Alexander Kohut
Resumo:
Zürich, Univ., Diss. 1902
Resumo:
During the Netherlands Indian Ocean Project (NIOP, 1992-1993) sediment community oxygen consumption (SCOC) was measured on two continental margins in the Indian Ocean with different productivity: the productive upwelling region off Yemen-Somalia and the supposedly less productive Kenyan margin, which lacks upwelling. The two margins also differ in terms of river input (Kenya) and the more severe oxygen minimum in the Arabian Sea. Simultaneously with SCOC, distributions of benthic biomass and phytodetritus were studied. Our expectation was that benthic processes in the upwelling margin of the Arabian Sea would be relatively enhanced as a result of the higher productivity. On the Kenyan margin, SCOC (range 1-36 mmol/m**2/d) showed a clear decrease with increasing water depth, and little temporal variation was detected between June and December. Highest SCOC values of this study were recorded at 50 m depth off Kenya, with a maximum of 36 mmol/m**2/d in the northernmost part. On the margin off Yemen-Somalia, SCOC was on average lower and showed little downslope variation, 1.8-5.7 mmol/m**2/d, notably during upwelling, when the zone between 70 and 1700 m was covered with low O2 water (10-50 µM). After cessation of upwelling, SCOC at 60 m depth off Yemen increased from 5.7 to 17.6 mmol/m**2/d concurrently with an increase of the near-bottom O2 concentration (from 11 to 153 µM), suggesting a close coupling between SCOC and O2 concentration. This was demonstrated in shipboard cores in which the O2 concentration in the overlying water was raised after the cores were first incubated under in situ conditions (17 µM O2). This induced an immediate and pronounced increase of SCOC. Conversely, at deeper stations permanently within the oxygen minimum zone (OMZ), SCOC showed little variation between monsoon periods. Hence, organic carbon degradation in sediments on a large part of the Yemen slope appears hampered by the oxygen deficiency of the overlying water. Macrofauna biomass and the pooled biomass of smaller organisms, estimated by the nucleic acid content of the sediment, had comparable ranges in the two areas in spite of more severe suboxic conditions in the Arabian Sea. At the Kenyan shelf, benthic fauna (macro- and meiofauna) largely followed the spatial pattern of SCOC, i.e. high values on the northern shelf-upper slope and a downslope decrease. On the Yemen-Somali margin the macrofauna distribution was more erratic. Nucleic acids displayed no clear downslope trend on either margin owing to depressed values in the OMZ, perhaps because of adverse effects of low O2 on small organisms (meiofauna and microbes). Phytodetritus distributions were different on the two margins. Whereas pigment levels decreased downslope along the Kenya margin, the upper slope off Yemen (800 m) had a distinct accumulation of mainly refractory carotenoid pigments, suggesting preservation under low 02. Because the accumulations of Corg and pigments on the Yemen slope overlap only partly, we infer a selective deposition and preservation of labile particles on the upper slope, whereas refractory material undergoes further transport downslope.
Resumo:
La existencia de un alto número de refugiados o personas desplazadas internamente en un país se considera un indicador primario de inestabilidad. Según este criterio, y todos los demás, Yemen es uno de los Estados más frágiles del mundo. Se sabe menos acerca de cómo el contexto afecta la vulnerabilidad de refugiados, desplazados internos y migrantes y qué se puede hacer para fortalecer su protección.
Resumo:
Las estrategias de los refugiados yemeníes en Somalia se basan en gran parte en las relaciones sociales y los vínculos culturales que existen entre el Cuerno de África y Yemen. Mientras tanto, los refugiados somalíes que regresan de Yemen deben buscar zonas más seguras dentro de Somalia.
Resumo:
This layer is a georeferenced raster image of the historic paper map entitled: Terrae Yemen maxima Pars. seu Imperii Imami, Principatus Kaukebân, nec non ditionum Haschid U Bekîl, Nehhm, Chaulân, Abu Arîsch Et Aden Tabula : ex observationibus astronomicis et hodometricis jussu et suntibus Potentissimor: Daniae Regnum Friderici V et Christiani VII institutis, delineata Auctore C. Niebuhr ; Gustav Conrad Lotter Sculps. It was published by Tob. Conr. Lotter in 1774. Scale [ca. 1,250,000]. Covers a portion of Yemen and Saudi Arabia. Map in Latin. The image inside the map neatline is georeferenced to the surface of the earth and fit to the World Miller Cylindrical projection. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, cities and other human settlements, territorial boundaries, shoreline features, and more. Relief shown by hachures. This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection as part of the Open Collections Program at Harvard University project: Islamic Heritage Project. Maps selected for the project represent a range of regions, originators, ground condition dates, scales, and purposes. The Islamic Heritage Project consists of over 100,000 digitized pages from Harvard's collections of Islamic manuscripts and published materials. Supported by Prince Alwaleed Bin Talal and developed in association with the Prince Alwaleed Bin Talal Islamic Studies Program at Harvard University.
Resumo:
delineata Auctore C. Niebuhr ; Gustav Conrad Lotter Sculps.
Resumo:
Mode of access: Internet.
Resumo:
Added t.-p & text in Hebrew; preface also in English.
Resumo:
"ACTION 4200.75"--(P. 4).