Suchergebnisse

A new approach to explaining the existence of firms and markets, focusing on variability and coordination. It stands in contrast to the emphasis on transaction costs, and on monitoring and incentive structures, which are prominent in most of the modern literature in this field. This approach, called the variability approach, allows us to: show why both the need for communication and the coordination costs increase when the division of labor increases; explain why, while the firm relies on direction, the market does not; rigorously formulate the optimum divisionalization problem; better understand the relationship between technology and organization; show why the `size' of the firm is limited; and to refine the analysis of whether the existence of a sharable input, or the presence of an external effect leads to the emergence of a firm. The book provides a wealth of insights for students and professionals in economics, business, law and organization

Fil: Camacho, A. Servicio Geológico Minero Argentino; Argentina. ; This report is the final presentaton of argon-argon and rubidium-strontium geochronological data for samples from the Sierras Septentrionales de Córdoba (Provincia de Córdoba), Sierras de San Luis and Comechingones (Provincias de San Luis and Córdoba), and the Sierras de Chepes and Las Minas (Provincia de La Rioja) areas. The Geoscientific Mapping of the Sierras Pampeanas is a cooperative project between the Australian Geological Survey Organisation (AGSO) and the Dirección Nacional del Servicio Geológico (DNSG) of the Subsecretaría de Minería, funded by the Government ofthe Argentine Republic. As a pilot second generation mapping program, the project aims to update the geoscientific knowledge base, provide a modern framework for resource assessment, and promote exploration and development in the region. The project covers three separate areas totalling 27 000 square kilometres in the southern part of the Sierras Pampeanas, Argentina (Figure 1) where basement Precambrian to Palaeozoic metamorphic and granitic rocks crop out on the eastern margin of the Andean Mobile Bel t. The area, well known for its production of industrial and construction materials also contains numerous metallic deposits. Mineral resources include gold and polymetallic (Ag, Pb, and Zn) vein deposits, Ni-Cu sulfide deposits, tungsten, beryllium, lithium, niobium, tantalum, tin, manganese, and chromium. The three areas were selected to provide key information on their geology and mineral potential through the application of integrated geophysical/geological mapping and metallogenic analysis and to provide a continuous section of the major tectonostratigraphic packages comprising the southern Sierras Pampeanas. As part of the Work Program, geochronological analyses, using U-Pb, Ar-Ar and Rb-Sr techniques of selected samples were undertaken. The aim of the geochronological program is to provide key data to establish the timing of igneous rock crystallisation, major metamorphic/deformation episodes, and mineralising events. The data also allow independent correlation of metamorphic rock packages with numerical age control, assisting geological mapping of the project area, and providing an important database and framework for tectonic interpretation of the Sierras Pampeanas. In total, 41 samples were collected for geochronological analysis, including samples representative of basement rock types found in the three detailed study areas and samples associated with the mineral occurrence mapping program. Ali samples submitted for geochronological analysis were petrographically described and analysed for whole-rock major and trace elements. This report presents 40 Ar-39 Ar data for white mica in eight samples of mineralised and hydrothermally altered rocks; white mica and biotite in five samples of rocks from shear zones; and two white mica samples from pegmatites that intruded synchronous with deformation. Sample location data, petrographic descriptions and whole rock geochemical analyses were reported by Stuart-Smith and others ( 1996), Sims and others ( 1996) and Lyons and others ( l 996), respectively. Brief descriptions of the geological settings of the samples are given in the results for each group of samples, followed by summary comments on 40 Ar-39 Ar ages. Further descriptions of the geology pertaining to the 40 Ar-39 Ar geochronology samples, as well as geological interpretations of the geochronology data in relation to the metallogenic, magmatic and tectonic evolution of the three regio ns studied, are presented in the Economic Geology sections and other parts of the reports by Sims and others ( 1997), Lyons and others (1997) and Pieters and others (1997). The results ofU-Pb geochronological analyses are presented in Camacho and Ireland ( 1996, 1997).

67 personalidades de vários quadrantes da vida pública portuguesa reflectem sobre os desafios e as responsabilidades que se colocam a Portugal na ressaca do auge da pandemia e numa época inédita de ajudas financeiras da União Europeia, com a célebre "bazuca". Entre muitos outros, textos de Adriano Moreira, Rui Manuel Nabeiro, Afonso Reis Cabral, Isabel Stilwell, Carlos Coelho, Alexandre Relvas, Anna Westerlund, Francisco Assis, Isabel Jonet, Tiago Mayan Gonçalves, Pedro Abrunhosa, Ricardo Mexia, Luís Todo Bom e José Manuel Fernandes. Um livro apadrinhado pelo ISCTE - Executive Education.

Cubierta -- Título -- Créditos -- Índice -- Introducción -- "A la orilla del precipicio": losalzamientos de esclavos" -- Los monstruos de la periferia:los personajes de José VictorianoBetancourt -- Las nodrizas africanas -- La sangre y la virtud de la mulata -- "Signo de propiedad": José Martí y losnegros de Charleston -- Negro y criminal: los ñáñigos deFrancisco Calcagno -- Espacios de (con)ten(c)sión: los negros,la música y el baile -- "Con grande peligro": la herenciaracial y la igualdad espiritual en Martí -- Conclusiones -- Bibliografía.