Africa, 1802 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Africa. It was published by A. Arrowsmith, Rathbone Place, Nov. 1, 1802. Scale [ca. 1:6,500,000]. Covers also Cape Verde Islands and Madagascar. The image inside the map neatline is georeferenced to the surface of the earth and fit to the 'Africa Sinusoidal' 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 is shown by hachures. This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection and the Harvard University Library as part of the Open Collections Program at Harvard University project: Organizing Our World: Sponsored Exploration and Scientific Discovery in the Modern Age. Maps selected for the project correspond to various expeditions and represent a range of regions, originators, ground condition dates, scales, and purposes.

West & North Africa, ca. 1710 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Carte de la Barbarie, le [sic] la Nigritie et del la Guinée, par Guillaume de l'Isle de l'Academie Royale des Sciences. It was published by ex officina Nicolai Visscher, ca. 1710. Scale [ca.1:9,000,000]. Covers West and North Africa. Map in French.The image inside the map neatline is georeferenced to the surface of the earth and fit to the Africa Sinusoidal projected coordinate system. 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, routes and roads, territorial boundaries, shoreline features, and more. Relief shown pictorially. Includes notes.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

West & North Africa, ca. 1730 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Carte de la Barbarie, le la Nigritie et de la Guinée, par Guill[au]me Del'Isle, de l'Academie Royale des Sciences. It was published by Chez Jean Cóvens et Corneille Mortier, Geographes ca. 1730. Scale [ca.1:9,250,000]. Covers West and North Africa. Map in French.The image inside the map neatline is georeferenced to the surface of the earth and fit to the Africa Sinusoidal projected coordinate system. 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, roads and routes, territorial boundaries, shoreline features, and more. Relief shown pictorially. Includes notes.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

West & Central Africa, ca. 1690 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Effigies ampli Regni auriferi Guineae in Africa siti, extensum inde ad insulis Atlanticis, vulgo dictis, de Cabo Verde : ad flumen Benin, us[que], ad cujus ripam sita est Regia urbs et magna Benin, at[que] inde ad promontorium Lopi Gonsalvi, delineata per S. Rovelascum, et politioribus lineamentis figurata per Lodovicum Texeram, protocosmographum Regis Hispaniarum ; Baptista Doetechomius sculpsit ; Carolus Allardt excudit. It was published by Carolus Allardt ca. 1690. Scale [ca. 1:8,000,000]. Covers portions of West and Central Africa. Map in Latin and Portuguese.The image inside the map neatline is georeferenced to the surface of the earth and fit to the World Miller Cylindrical projected coordinate system. 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, shoreline features, and more. Includes also illustrations and text.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

West & Central Africa, ca. 1753 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: A new and correct map of the coast of Africa : from Cape Blanco lat. 20°40'. N. to the coast of Angola lat. 11°. S. : with explanatory notes of all the forts and settlements belonging to the several European powers, R. W. Seale, sculp. It was published by J. & P. Knapton ca. 1753. Scale [ca. 1:10,000,000]. Covers portions of West and Central Africa.The image inside the map neatline is georeferenced to the surface of the earth and fit to the World Miller Cylindrical projected coordinate system. 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 claims, forts, factories, shoreline features, and more. Includes also notes, index, and inset: A separate map of the Gold Coast, upon a larger scale.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

West Coast of Africa, 1745 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: A draught of the coast of Africa from the streights-mouth to Cape Bona-Esprance. It was published by E. Say in 1745. Scale [ca. 1:19,000,000]. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Africa Lambert Conformal Conic projected coordinate system. 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 (ports, shoals), and more. Shows trading posts by national claim.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

A "memória do império" ou o "império da memória" : a salvaguarda do património arquitectónico português ultramarino : (1930-1974)

Tese de doutoramento, História (Arte, Património e Restauro), Universidade de Lisboa, Faculdade de Letras, 2016

Composition of basalts from the north part of the Bougault anomaly, Mid-Atlantic Ridge 15°N

A quantitative model of development of magmatic and ore-magmatic systems under crests of mid-ocean ridges is constructed. Correct physical models of melting zone formation in approximation to active spreading, non-stationary dynamics of magma intrusion from a center of generation, filling of magma chambers of various shapes, feeding of fissure-type volcanoes, and retrograde boiling of melts during solidification of intrusive bodies beneath axial zones of spreading in crests of ridges are proposed. Physicochemical and mathematical theories of disintegration of multi-component solutions, growth of liquational drops of ore melts, and sublimation of components from magmatic gases are elaborated. Methods for constructing physically correct models of heat and mass transfer in heterophase media are devised. Modeling of development of magmatic and ore-magmatic systems on the basis of the Usov-Kuznetsov facies method and the Pospelov system approach are advanced. For quantitative models numerical circuits are developed and numerical experiments are carried out.

Magnetic charachterization of surface sediments in the South Atlantic

Surface sediment samples representative for the tropical and subtropical South Atlantic (15°N to 40°S) were investigated by isothermal magnetic methods to delineate magnetic mineral distribution patterns and to identify their predominant Holocene climatic and oceanographic controls. Individual parameters reveal distinct, yet frequently overlapping, regional sedimentation characteristics. A probabilistic ('fuzzy c-means') cluster analysis was applied to five concentration independent magnetic properties assessing magnetite to hematite ratios and diagnostic of bulk and fine-particle magnetite grain size and coercivity spectra. The resultant 10 cluster structures establish an oceanwide magnetic sediment classification scheme tracing the major terrigenous eolian and fluvial fluxes, authigenic biogenic magnetite accumulation in high-productivity areas, transport by ocean current systems, and effects of bottom water velocity on depositional regimes. Distinct dissimilarities in magnetic mineral inventories between the eastern and western basins of the South Atlantic reflect prominent contrasts of both oceanic and continental influences.

Quantitative composition and distribution of the silt fraction in surface sediments of the North-West African continental margin

Surface sediments from the continental slope and rise of North-West Africa between the Canary lslands and the Cape Verde Islands are mainly composed of silt-sized material (2-63 µm). A number of sampling profiles were run normal to the coast and the composition of the silt fraction was determined quantitatively by scanning electron microscope analysis. The carbonate portion of the sediment was found to be nearly exclusively of biogenic origin. The most important contributors are planktonic foraminifers and coccoliths with minor contributions derived from pteropods. Plankton-produced biogenic opal such as diatoms and radiolarians play a very minor role. The high production rates of opal-silica plankton which exists in the surface waters of the NW-African upwelling system does not give rise to corresponding increases of opal accumulation in the bottom sediment. Benthic producers consist mainly of foraminifers and molluscs but the entire input from benthic producers is extremely small. An exception to this occurs in the prodelta sediments of the Senegal river. Downslope particle transport is indicated by the occurrence of shallow-water coralline algae, ascidian sclerites and cliona boring chips and can be traced as far down as the continental rise. The non-carbonate silt fraction mostly consists of quartz which is derived as eolian dust from the Sahara desert by the Harmattan and the NE-Trade-wind system. The percentage of carbonate in the surface sediments directly indicates the relative proportions of autochthonous biogenic components and terrigenous allochthonous quartz particles.