Restoration Techniques Applied to Tile Dome Conservation in the Western Mediterranean. Valencia,Spain

The domes studied, widespread in a large area of the Mediterranean, constitute an architectural heritage of great value to the history of architecture and construction. They were all built using brick masonry and ceramic tile roofs. Restoration work has made it possible to define their geometry, including the construction layouts of the buildings. In addition, on inspection it can be seen that common construction problems tend to be located at specific critical points. The restoration process of different cases sharing the same methodology, construction criteria, and solutions is accurately described. Following international charters, there is minimal intervention and maximum respect for the original solutions, but also a carefully considered incorporation of new materials and technologies to improve the critical points.     

Predynastic Egypt: new data from Maadi

Recent research in the easternmost area of the Maadi village-site near Cairo has yielded new data concerning both the nature of the occupation and the economy of the predynastic communities in Lower Egypt. Imported objects and raw materials, together with specialized crafts, have already suggested the existence of well organized village life, enriched by trading activities and foreign contacts, somehow related to expanding spheres of prestige. These conclusions are now amplified by evidence for a wide range of fully domesticated animal and plant species, including the remarkable occurrence of the domestic ass.Evaluation of both the artefacts and their distribution leads us to distinguish different areas in the site and to relate them to a long development through time. It is now necessary that more detailed typological comparisons be undertaken.

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Résumé Des recherches récentes dans la partie orientale du site de l'ancien village de Maadi près du Caire ont fourni de nouvelles données concernant la nature de l'occupation et l'économie des communautés pré-dynastiques en Basse Egypte. Des objets et des matières premières importés, ainsi que les artisanats spécialisés, avaient déjà suggéré que la vie au village était bien organisée, et enrichie par le commerce et par des contacts avec l'étranger, et que ceci était lié d'une manière quelconque à des sphères de prestige en expansion. Ces conclusions sont maintenant amplifiées par les évidences de toute une série d'espèces d'animaux et de plantes tout à fait domestiquées, y compris l'occurrence remarquable de l'âne domestiqué. L'évaluation des trouvailles et de leur répartition nous amène à distinguer de différentes zones d'activité dans le gisement, et les rattache à un long développement à travers le temps. Des comparaisons typologiques plus détaillées devraient maintenant être entreprises.

     

The Tax Policy Regime in American Politics, 1941-1951

This article analyzes the inception of the mass income tax during the Second World War as a decisive moment when relations among state, market, and citizens were reconfigured in a durable way. The state institutionalized the means to devise tax reform–a policy regime–during this formative period of partisan conflict over macroeconomic management strategies. The approach to policy analysis presented here illuminates the process by which political choices are made among competing policy visions embedded in state agencies. This study demonstrates that a policy regime perspective, when applied in a complementary way with interest-driven or institutionalist accounts, is best equipped to bring important but tacit constraints into clear analytical focus.     

Elchaxylon,a new corystosperm based on permineralized stems from the Late Triassic of Argentina

Artabe, A.E. & Zamuner, A.B., March 2007. Elchaxylon, a new corystosperm based on permineralized stems from the Late Triassic of Argentina. Alcheringa 31, 85‐96. ISSN 0311-5518.

Anatomically preserved stems of Late Triassic corystosperms from the Río Blanco Formation of Argentina are described and assigned to Elchaxylon zavattieriae gen. et sp. nov. The polyxylic gymnospermous axes have two discontinuous cambial rings, which develop centrifugal secondary xylem and centripetal secondary xylem around the mesarch primary xylem bundles. The centrifugal undivided pycnoxylic secondary xylem incorporates uniseriate rays, uni- to biseriate radial pitting either alternate or opposite, and one or two simple pits in each cross-field. Atypical secondary growth is restricted to localized development of centripetal secondary xylem (inverted xylem). Elchaxylon could represent a basal member of the rhexoxyloid lineage. This basal clade is characterized by limited centripetal secondary xylem, lack of perimedullar bundles, and modest development of centrifugal xylem.

Analia E. Artabe [aeartabe@museo.fcnym.unlp.edu.ar] and Alba B. Zamuner [azamuer@museo.fcnym.unlp.edu.ar]. División Paleobotánica, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque SN, 1900 La Plata, Argentina and Consejo Nacional de Investigaciones Científicas y Técnicas; received 20.5.2005, revised and accepted 14.9.2005.     

Fossil wood of the Mimosoideae from the early Paleocene of Patagonia,Argentina

Brea, M., Zamuner, A.B., Matheos, S.D., Iglesias, A. & Zucol, A.F., December, 2008. Fossil wood of the Mimosoideae from the early Paleocene of Patagonia, Argentina. Alcheringa 32, 427–441. ISSN 0311-5518.

An anatomically preserved mature stem from the Salamanca Formation (early Paleocene) at Palacio de Los Loros, central Patagonia, Argentina, is described and assigned to Paracacioxylon frenguellii sp. nov. The material was preserved by siliceous permineralization and shows features of the secondary xylem typical of subfamily Mimosoideae. This species represents the oldest record of the genus and of the Leguminosae along the western border of Gondwana, and is the world's second oldest record of Leguminosae wood. The species is characterized by ring-porous to semi-ring-porous vessels that are solitary, in multiples of 2–4 and clustered, simple perforation plates, alternate and vestured inter-vessel pitting, homocellular 1–6 seriate rays, tyloses, crystals and diffuse apotracheal, vasicentric paratracheal and confluent axial parenchyma. Paracacioxylon frenguellii has anatomical similarities to Acacia Miller. The presence of Paracacioxylon frenguellii associated with pulvinate leaves suggests that the legumes might have been a component of mesothermal forests developed along the western margin of the Golfo San Jorge Basin during the early Paleocene.     

Enhancing the Sustainability and Earthquake Resistance of Confined Masonry Dwellings: The Case of El Salvador

The seismic vulnerability of housing stock in El Salvador was demonstrated during the recent 2001 earthquakes. Relative to other types of common residential construction, confined masonry dwellings performed well. A coordinated pilot study was conducted with the objective of improving the seismic resistance of this form of construction while reducing associated costs and greenhouse gas emissions. Laboratory tests examined brick strength in relation to firing temperature and duration. Analytical studies examined the potential for voided bricks to improve seismic performance, the reduction in demands associated with stiffening the roof diaphragm, and demands imposed on the roof bracing system. This pilot study identifies the potential for voided bricks to reduce construction costs and greenhouse gas emissions with negligible effects on performance. The addition of end-bay diagonal bracing at the roof level resulted in significant performance enhancements.