1,118 research outputs found

    The future obligations of "project manager" as construction integral director (DIPE) in the law of buildings construction in spain (LOE)

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    In the year 1999 approves the Law of Construction Building (LOE, in Spanish) to regulate a sector such as construction, which contained some shortcomings from the legal point of view. Currently, the LOE has been in force 12 years, changing the spanish world of the construction, due to influenced by internationalization. Within the LOE, there regulating the different actors involved in the construction building, as the Projects design, the Director of Construction, the developer, The builder, Director of execution of the construction (actor only in Spain, similar as construcion engineer and abroad in), control entities and the users, but lacks figure Project manager will assume the delegation of the promoter helping and you organize, direct and management the process. This figure assumes that the market and contracts are not legally regulated in Spain, then should define and establish its regulation in the LOE. (Spain Construction Law) The translation in spanish of the words "Project Manager is owed to Professor Rafael de Heredia in his book Integrated Project Management, as agent acting on behalf of the organization and promoter assuming control of the project, ie Integraded Project Management . Already exist in Spain, AEDIP (Spanish Association Integrated of Project Construction management) which comprises the major companies in “Project Management” in Spain, and MeDIP (Master in Integrated Construction Project) the largest and most advanced studies at the Polytechnic University of Madrid, in "Construction Project Management" they teach which is also in Argentina. The Integrated Project ("Project Management") applied to the construction process is a methodological technique that helps to organize, control and manage the resources of the promoters in the building process. When resources are limited (which is usually most situations) to manage them efficiently becomes very important. Well, we find that in this situation, the resources are not only limited, but it is limited, so a comprehensive control and monitoring of them becomes not only important if not crucial. The alternative of starting from scratch with a team that specializes in developing these follow directly intervening to ensure that scarce resources are used in the best possible way requires the use of a specific methodology (Manual DIP, Matrix Foreign EDR breakdown structure EDP Project, Risk Management and Control, Design Management, et ..), that is the methodology used by "Projects managers" to ensure that the initial objectives of the promoters or investors are met and all actors in process, from design to construction company have the mind aim of the project will do, trying to get their interests do not prevail over the interests of the project. Among the agents listed in the building process, "Project Management" or DIPE (Director Comprehensive building process, a proposed name for possible incorporation into the LOE, ) currently not listed as such in the LOE (Act on Construction Planning ), one of the agents that exist within the building process is not regulated from the legal point of view, no obligations, ie, as is required by law to have a project, a builder, a construction management, etc. DIPE only one who wants to hire you as have been advanced knowledge of their services by the clients they have been hiring these agents, there being no legal obligation as mentioned above, then the market is dictating its ruling on this new figure, as if it were necessary, he was not hired and eventually disappeared from the building process. As the aim of this article is regular the process and implement the name of DIPE in the Spanish Law of buildings construction (LOE

    Participating in the contingency. Painting, sweeping and cooking

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    The aim of this article is to identify, document and analyse three participatory actions undertaken in Mexico. They offer an alternative ground for analysis and reflection, as they were conducted outside the control of the State, offering the possibility to use different methodologies that contain key elements to think about a reorganization of the existing relation between Institutions and society. Based on extremely simple principles of action (painting, sweeping and cooking) their effects can help reshape the value and use of archaeological heritage in Mexico

    Mutual Education. Towards a model of educational co-creation around the archaeological heritage of Mexico

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    Today, the area surrounding the archaeological city of Teotihuacan is suffering a gradual process of destruction due to factors such as: the uncontrolled urban sprawl of neighbouring communities, the conurbation of Mexico City, and the conflictive relationship between the State Institution which is legally responsible for preserving these remains and these centres of population. This represents a multifactorial and convergent problem requiring coordinated action and participation on the part of the Mexican state, the local authorities, and the local population.This article deals with these problems from a generational perspective, based on the fact that, at the present time, thousands of school children and young people from these urban areas are forming criteria or opinions about the problem and learning from the positions taken by different players in the conflict. It is in this context, and via a post-doctoral study period supported by the Mexican National Council of Science and Technology (Consejo Nacional de Ciencia y Tecnología) (CONACYT) and the Institute of Heritage Sciences (INCIPIT-CSIC) in Spain, that we have built a strategy for scientific dissemination, named ‘Arqueólogos en Apuros’ (Archaeologists in Trouble), which consists of a multimedia children’s news bulletin presented by puppet reporters, with the aim of promoting processes of reflection among school children regarding the destruction of the pre-Columbian city and the problems implied by this fact. However, we wish to go beyond the act of simply providing information and hope to generate co-creation processes, in which these children can make decisions regarding the topics, formats, and representation of the news bulletin and can become capable of researching the news for themselves. In this paper, the theoretical and methodological evolution of this project is analysed, along with its successes, failures, and future challenges, which may enable us to establish the ways in which these young people relate to their heritage, reaching beyond the authorized discourse, and to help them to demand their right to preserve, defend, and enjoy this heritage within the framework of the expression of their creativity and spontaneity

    Dynamics and Control of Higher-order Nonholonomic Systems

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    A theoretical framework is established for the control of higher-order nonholonomic systems, defined as systems that satisfy higher-order nonintegrable constraints. A model for such systems is developed in terms of differential-algebraic equations defined on a higher-order tangent bundle. A number of control-theoretic properties such as nonintegrability, controllability, and stabilizability are presented. Higher-order nonholonomic systems are shown to be strongly accessible and, under certain conditions, small time locally controllable at any equilibrium. There are important examples of higher-order nonholonomic systems that are asymptotically stabilizable via smooth feedback, including space vehicles with multiple slosh modes and Prismatic-Prismatic-Revolute (PPR) robots moving open liquid containers, as well as an interesting class of systems that do not admit asymptotically stabilizing continuous static or dynamic state feedback. Specific assumptions are introduced to define this class, which includes important examples of robotic systems. A discontinuous nonlinear feedback control algorithm is developed to steer any initial state to the equilibrium at the origin. The applicability of the theoretical development is illustrated through two examples: control of a planar PPR robot manipulator subject to a jerk constraint and control of a point mass moving on a constant torsion curve in a three dimensional space

    The Gods die in museums

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    Recently, Johannes Neurath’s book, titled Subdue the gods, doubt the images (2020) was published, which, among other things, warns that, in the archaeological museums of Mexico, including the National Institute of Anthropology and History of Mexico City, there has been an “ontological mistreatment” of the sacred images of the pre-Hispanic era through their removal from their original locations and indistinct placement in large and cold rooms packed with monoliths, without any consideration for the fact that some were – and continue to be – images bestowed with power and influence by many communities today

    Ionic conductivity of ion-exchange membranes used as solid electrolyte in fuel cells: Influence of the salts

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    In this work, the ionic conductivity was determined by complex impedance spectroscopy in aqueous solution of two groups of membranes in order to characterize their electrochemical properties. The contributions of the membranes as well as the influence of the electrolyte solutions in the system have been evaluated. Thus, two different types of membranes were studied: proton exchange membranes (PEMs) and anion exchange membranes (AEMs), respectively. In the case of PEMs, novel membranes alternative to Nafion were used. These membranes are based on multiblock copolymers (SPES) and three different samples (3, 6 & 9) were studied. In AEMs, a semi-interpenetrating network membrane composed by polysulfone has been used. Different electrolyte solutions such as NaCl,HCl, KCl and NH4Cl in the case of PEMs, and NaCl,HCl, KOH and NH4Cl in the case of AEM ones have been used. The measurements have been done in a homemade cell using Ag/AgCl as reference electrodes and graphite as electrode work. For all the electrolytes and membranes conductivity studies, the admittance and the impedance have been studied using different diagrams like Nyquist or Bode. In order to compare and examine the conductivity results, many factors such as the ion mobility, ionic dissociation group or number of functional groups have been taken into account to obtain the more precisely information from all the electrolytes and membranes. The ionic conductivity of the membranes varied as a function of the concentration of the electrolytes as well as the number of functional groups in the polymeric backbones. PEMs and AEMs showed a good chemical stability and high conductivity values essential to be proposed as solid electrolytes membranes in fuel cells.Ingeniería de la Energí

    Emergence of granular-sized magnetic bubbles through the solar atmosphere. II. Non-LTE chromospheric diagnostics and inversions

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    Magnetic flux emergence into the outer layers of the Sun is a fundamental mechanism for releasing energy into the chromosphere and the corona. In this paper, we study the emergence of granular-sized flux concentrations and the structuring of the corresponding physical parameters and atmospheric diagnostics in the upper photo- sphere and in the chromosphere. We make use of a realistic 3D MHD simulation of the outer layers of the Sun to study the formation of the Ca II 8542 line. We also derive semi-empirical 3D models from non-LTE inversions of our observations. These models contain depth-dependent information of the temperature and line-of-sight stratification. Our analysis explains the peculiar Ca II 8542 profiles observed in the flux-emerging region. In addition, we derive detailed temperature and velocity maps describing the ascent of magnetic bubbles from the photosphere to the chromosphere. The inversions suggest that, in active regions, granular-sized bubbles emerge up to the lower chromosphere where the existing large-scale field hinders their ascent. We report hints of heating when the field reaches the chromosphere.Comment: Submitted to ApJ, 10 Figure

    Thrust Vector Control of an Upper-Stage Rocket with Multiple Propellant Slosh Modes

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    “The thrust vector control problem for an upper-stage rocket with propellant slosh dynamics is considered. The control inputs are defined by the gimbal deflection angle of a main engine and a pitching moment about the center of mass of the spacecraft. The rocket acceleration due to the main engine thrust is assumed to be large enough so that surface tension forces do not significantly affect the propellant motion during main engine burns. A multi-mass-spring model of the sloshing fuel is introduced to represent the prominent sloshing modes. A nonlinear feedback controller is designed to control the translational velocity vector and the attitude of the spacecraft, while suppressing the sloshing modes. The effectiveness of the controller is illustrated through a simulation example.”—Publisher’s website (Hindawi Publishing Corp.
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