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El articulo discute sobre los inicios del señorio de México-Tiatelolco con el enfoque de la la fundación de México-Tenochtitlan y la información disponible sobre el evento fundacional tlatelolca,.

The geotechnical zoning of the soils was carried out in Valledupar (Cesar) by collecting data in various soil laboratories and obtaining samples. The research database was created. The types of soils found were SC, SM and GW identified in all the communes of the city. The water table was found from a depth of 1.2 meters. The document contains the necessary information for geotechnical studies of the area where it is concluded that the city can support building foundations of more than 10 levels, in areas with high percentages of gravel, these areas will be the ones with the highest incidence when increasing coverage of aqueduct and sewerage networks. It is the first geotechnical research study through geographic information models in Valledupar; This indicates the generation of a technical and bibliographic resource for quick consultation. [ABSTRACT FROM AUTHOR]

When designing a project using piles, depending on the distance between them, the behavior of one interferes with the other. This interference occurs in terms of both the carrying capacity and the settlement ratio. Research on the group effect on typical Fortaleza soils is scarce, which justifies and prompts this work. The objective of the present investigation is to evaluate the group effect of piles excavated in a granular profile soil, typical to those that occur in the subsoil of the city of Fortaleza -Ceará- Brazil. For this, 26 piles were emplaced in a field located inside the campus of the Universidade Federal do Ceará (Campus experimental of Geotecnia and foundations of the UFC). Piles were isolated in groups of 2 to 4 piles, varying the distance between them. The subsoil was characterized by the collection of test results that were previously made in the sector. Additionally, a percussion drill excavation (SPT) was performed, with results of resistance indexes (NSPT) corrected based on efficiency estimates. Subsequently, static load tests (PCE) were performed on the groups of piles executed. It is verified that the piles worked only by lateral friction, and the group effect is observed in all the investigated spacings. [ABSTRACT FROM AUTHOR]

The text explores some of the central elements of the so-called human enhancement project in light of its epistemological, technical and anthropological foundations to build an interpretative framework that shows how the philosophy of technology is a valuable tool for analysis. The document analyzes definitions and modalities of human enhancement, both from the perspective of its objectives and scope as well as from that of its limits and main obstacles, exposing how a multidimensional analysis can be strengthened from the epistemic framework of the philosophy of technology. [ABSTRACT FROM AUTHOR]

This paper describes an experience in the use of mathematical models and load tests on hydrotechnical structures. The results obtained from the load test performed on the sheet pile of a dock, located in the eastern part of Cuba, are presented. Horizontal and vertical deformations were measured. A comparison is made between the theoretical methods for deformation calculation and the mathematical methods based on the finite-element method. Finally, the coincidence of results obtained from the numerical model and those of a real-scale load test is proved, thus showing that deformations could not become a risk if the dock is subject to a new load system. [ABSTRACT FROM AUTHOR]

Drilled deep foundations may be subjected to horizontal loads. Under this condition, the behavior analysis is complicated due to the tridimensionality of the problem. However, the models used in engineering practice often reduce the analysis to two dimensions. In this paper the procedure proposed by Matlock and Reese (1960) is modified for its applicability to loess soils. An alternative to establish the variation of the horizontal subgrade reaction module as a function of depth, for soils with intermediate characteristics between sands and clays, such as silty soils, is developed. An analogy between the cavity expansion and deflection of a pile subjected to lateral loads is established for construction of horizontal charge transfer p-y curves under natural humidity and saturated conditions. Finally, two study cases are analyzed, where the response of pile installed on loess silty soil layer suffering localized wetting is computationally evaluated. Results show the importance of considering the accidental wetting increase, when the piles are installed in unstable soils. [ABSTRACT FROM AUTHOR]

The studies about the vulnerability of the houses are an important tool in the taking of decisions for the local authorities regarding to the intervention of the patrimony and the decreasing of the physical vulnerability of this. This article is about a study made for one of the most damaged locality by tropical cyclones in the last twenty five years in the central region of Cuba. The use of a Geographical Information System, the definition of the most dangerous winds because of the hurricanes and the different levels of vulnerability at the urban scale and for the houses, stablish some priorities regarding to the constructive rehabilitation of the houses of this zone. [ABSTRACT FROM AUTHOR]

A methodology for real-time systems design is proposed, focusing on their execution on Hardware platforms (DSP), based on hierarchical understanding of problems using fundamental building stages, in which the lowest level (the foundation stage), is developed by applying digital signal processing techniques in order to implement the algorithms and to accomplish the objective. An illustrative example, consisting of getting the fundamental frequency (pitch) from voice signals, is shown in order to explain this method, proving good performance in terms of process rate and calculated values, compared to reference models. Finally, complementary procedures for optimization is accepted for maximize the potential resources of the system. [ABSTRACT FROM AUTHOR]

In the present work the modeling of the foundations is approached on piles of great use in the foundations in chimneys and structures of great height in the sugar industry. New design coefficients are proposed and compared that allow using the design of rational and safe foundations as well. It is exemplified through comparisons the results obtained through the modeling with other formulations, assessing the validation of the proposed pattern and their possible application. [ABSTRACT FROM AUTHOR]