Inertial behavior of offshore devices

In the last years, there has been a continued growth in the number of offshore operations for handling large equipment and objects, with emphasis on installation and maintenance of devices for exploiting marine renewable energy like generators for harnessing wind, waves and currents energy. Considering the behaviour of these devices during manoeuvrings, and due to their size and by the interaction with the surrounding fluid, the effect of inertial forces and torques is very important, which requires a specific modelling. This paper especially discusses the masses and moments of inertia modelling problem, with the aim to use it in the simulation of the complex manoeuvres of these devices and in the automatic control systems designed for their offshore operations. Given the importance and complexity of the added mass modelling, a method for its early design identification, developed by the R&D Group on Marine Renewable Energy Technologies of the UPM (GITERM) and its use on special cases like emersion manoeuvres of devices from underwater to the surface will be presented.

Análisis de registros de aceleraciones verticales en caja de grasa y correlación con la infraestructura

El sector ferroviario ha experimentado en los últimos años un empuje espectacular acaparando las mayores inversiones en construcción de nuevas líneas de alta velocidad. Junto a esta inversión inicial no se debe perder de vista el coste de mantenimiento y gestión de las mismas y para ello es necesario avanzar en el conocimiento de los fenómenos de interacción de la vía y el material móvil. En los nuevos trazados ferroviarios, que hacen del ferrocarril un modo de transporte competitivo, se produce un notable aumento en la velocidad directamente relacionado con la disminución de los tiempos de viaje, provocando por ello elevados esfuerzos dinámicos, lo que exige una elevada calidad de vía para evitar el rápido deterioro de la infraestructura. Resulta primordial controlar y minimizar los costes de mantenimiento que vienen generados por las operaciones de conservación de los parámetros de calidad y seguridad de la vía férrea. Para reducir las cargas dinámicas que actúan sobre la vía deteriorando el estado de la misma, debido a este aumento progresivo de las velocidades, es necesario reducir la rigidez vertical de la vía, pero igualmente este aumento de velocidades hace necesarias elevadas resistecias del emparrillado de vía y mejoras en las plataformas, por lo que es necesario buscar este punto de equilibrio en la elasticidad de la vía y sus componentes. Se analizan las aceleraciones verticales medidas en caja de grasa, identificando la rigidez vertical de la vía a partir de las frecuencias de vibración vertical de las masas no suspendidas, correlacionándola con la infraestructura. Estas aceleraciones verticales se desprenden de dos campañas de medidas llevadas a cabo en la zona de estudio. En estas campañas se colocaron varios acelerómetros en caja de grasa obteniendo un registro de aceleraciones verticales a partir de las cuales se ha obteniendo la variación de la rigidez de vía de unas zonas a otras. Se analiza la rigidez de la vía correlacionándola con las distintas tipologías de vía y viendo la variación del valor de la rigidez a lo largo del trazado ferroviario. Estos cambios se manifiestan cuando se producen cambios en la infraestructura, de obras de tierra a obras de fábrica, ya sean viaductos o túneles. El objeto principal de este trabajo es profundizar en estos cambios de rigidez vertical que se producen, analizando su origen y las causas que los provocan, modelizando el comportamiento de los mismos, para desarrollar metodologías de análisis en cuanto al diseño de la infraestructura. Igualmente se analizan los elementos integrantes de la misma, ahondando en las características intrínsecas de la rigidez vertical global y la rigidez de cada uno de los elementos constituyentes de la sección tipo ferroviaria, en cada una de las secciones características del tramo en estudio. Se determina en este trabajo si se produce y en qué medida, variación longitudinal de la rigidez de vía en el tramo estudiado, en cada una de las secciones características de obra de tierra y obra de fábrica seleccionadas analizando las tendencias de estos cambios y su homogeneidad a lo largo del trazado. Se establece así una nueva metodología para la determinación de la rigidez vertical de la vía a partir de las mediciones de aceleraciones verticales en caja de grasa así como el desarrollo de una aplicación en el entorno de Labview para el análisis de los registros obtenidos. During the last years the railway sector has experienced a spectacular growth, focusing investments in the construction of new high-speed lines. Apart from the first investment the cost of maintaining and managing them has to be considered and this requires more knowledge of the process of interaction between track and rolling stock vehicles. In the new high-speed lines, that make of the railway a competitive mode of transport, there is a significant increase in speed directly related to the shorten in travel time, and that produces high dynamic forces. So, this requires a high quality of the track to avoid quickly deterioration of infrastructure. It is essential to control and minimize maintenance costs generated by maintenance operations to keep the quality and safety parameters of the railway track. Due to this gradual increase of speed, and to reduce the dynamic loads acting on the railway track causing its deterioration, it is necessary to reduce the vertical stiffness of the track, but on the other hand this speed increase requires high resistance of the railway track and improvements of the railway platform, so we must find the balance between the elasticity of the track and its components. Vertical accelerations in axle box are measured and analyzed, identifying the vertical stiffness of the railway track obtained from the vertical vibration frequency of the unsprung masses, correlating with the infrastructure. These vertical accelerations are the result of two measurement campaigns carried out in the study area with the placement of several accelerometers located in the axle box. From these vertical accelerations the variation of the vertical stiffness from one area to another is obtained. The track stiffness is analysed relating with the different types of infrastructure and the change in the value of the stiffness along the railway line. These changes are revealed when changes in infrastructure occurs, for instance; earthworks to bridges or tunnels. The main purpose of this paper is to examine these vertical stiffness changes, analysing its origins and causes, modelling their behaviour, developing analytical methodologies for the design of infrastructure. In this thesis it is also reviewed the different elements of the superstructure, paying special attention to the vertical stiffness of each one. In this study is determined, if it happens and to what extent, the longitudinal variation in the stiffness of track along the railway line studied in every selected section; earthwork, bridges and tunnels. They are also analyzed trends of these changes and homogeneity along the path. This establishes a new method for determining the vertical stiffness of the railway track from the vertical accelerations measured on axle box as well as an application developed in LabView to analyze the recordings obtained.

High-speed polynomial basis multipliers over GF(2(m)) for special pentanomial.

Efficient hardware implementations of arithmetic operations in the Galois field are highly desirable for several applications, such as coding theory, computer algebra and cryptography. Among these operations, multiplication is of special interest because it is considered the most important building block. Therefore, high-speed algorithms and hardware architectures for computing multiplication are highly required. In this paper, bit-parallel polynomial basis multipliers over the binary field GF(2(m)) generated using type II irreducible pentanomials are considered. The multiplier here presented has the lowest time complexity known to date for similar multipliers based on this type of irreducible pentanomials.

Bundeswehr 3.0: The political, military and social dimensions of the reform of the German armed forces. OSW Point of View Number 28, May 2012

This reform of the Bundeswehr, launched in 2011, is the latest of the three decisive stages in the post-war transformation of the German armed forces. The reform aims at “constructing” the armed forces anew in the political, military and social dimensions.The present paper presents the evolution of the role of the armed forces in German foreign and security policy and the ongoing process of “constructing” a new Bundeswehr. It analyses the process of redefining the objectives and principles of: the Bundeswehr’s participation in international operations, its current military transformation, and changes in its image and social identity. It also presents the implications of this broader transformation for political and military.

Strategic Insurance: The Future of the Belgian Armed Forces. IES Policy Brief Issue 2014/04/May 2014

Summary. Belgium is on the cusp of its next defence reform. While the security landscape throughout Europe’s neighbourhood and beyond deteriorates, the armed forces face numerous challenges. Most importantly, the next defence plan needs to recalibrate the force structure in function of political ambitions and budgetary realities. This Policy Brief argues that Belgium must embrace a nimble but broad-spectrum force. Any future structure must encompass agile land forces as well as a modern combat air force, without neglecting the need to safeguard a sizeable navy and invest in cyber capabilities. European cooperation should be pursued wherever possible while recognising that this necessitates budgetary convergence. For Belgium this means the investment budget needs to grow significantly in order to acquire interoperable but self-owned assets. Such a choice can be justified on the recognition that defence is not just about expeditionary operations, but also economic stimulus, intergenerational solidarity and strategic insurance: maintaining the ability to respond to whatever the future may bring.

State Transformation and the European Integration Project. Lessons from the financial crisis and the Greek paradigm. CEPS Special Report No. 130/February 2016

The financial crisis that erupted in the eurozone not only affected the EU’s financial governance mechanisms, but also the very nature of state sovereignty and balances in the relations of member states; thus, the actual inequalities between the member states hidden behind their institutional equality have deteriorated. This transformation is recorded in the case law of the Court of Justice of the European Union and the member states’ constitutional courts, particularly in those at the heart of the crisis, with Greece as the most prominent example. It is the issue of public debt (sovereign debt) of the EU member states that particularly reflects the influence of the crisis on state sovereignty as well as the intensely transnational (intergovernmental) character of European integration, which under these circumstances takes the form of a continuous, tough negotiation. The historical connection between public debt (sovereign debt) and state sovereignty has re-emerged because of the financial crisis. This development has affected not only the European institutions, but also, at the member state level, the actual institutional content of the rule of law (especially judicial review) and the welfare state in its essence, as the great social and political acquis of 20th century Europe. From this perspective, the way that the Greek courts have dealt with the gradual waves of fiscal austerity measures and structural reforms from 2010 to 2015 is characteristic. The effect of the financial crisis on the sovereignty of the member states and on the pace of European integration also has an impact on European foreign and security policy, and the correlations between the political forces at both the national and European level, thus producing even more intense pressures on European social democracy. In light of the experience of the financial crisis, the final question is whether the nation state (given the large real inequalities among the EU member states) currently functions as a brake or as an engine for future European integration.

American oil operations abroad,

"Based upon the report of the Group on American petroleum interests in foreign countries to the Special committee investigating petroleum resources, Senator Joseph C. O'Mahoney, chairman."--Pref.

Ionizing radiations; their production, effects, and utilization, with special reference to food and packaging technology.

Mode of access: Internet.

Special Senate investigation on charges and counter-charges involving: Secretary of the Army Robert T. Stevens,

Supplement to hearings of Apr. 22, 1954 (ii, 9 p.) inserted in v.1.

An analysis of guardrail and median barrier accidents using the Longitudinal Barrier Special Studies (LBSS) file. Volume I: final report.

Federal Highway Administration, Office of Safety and Traffic Operations Research and Development, McLean, Va.

An analysis of guardrail and median barrier accidents using the Longitudinal Barrier Special Studies (LBSS) file. Volume II: users guide.

Federal Highway Administration, Office of Safety and Traffic Operations Research and Development, McLean, Va.

High-intensity noise and military operations: An evaluation

"Project NR 140-069. Contract NONR-1151 (01)."

Investigation of organized crime in interstate commerce. Hearings before a Special Committee to Investigate Organized Crime in Interstate Commerce, United States Senate, Eighty-first Cingress, second session, pursuant to S. Res. 202 ...

pt.1.Florida.--pt.1A.Florida.--pt.2.Federal communications, etc.--pt.3.Black market operations.--pt.4.Missouri.--pt.4A.Missouri.--pt.5.Illinois.--pt.6.Ohio-Kentucky.--pt.7.New York-New Jersey.--pt.8.Louisiana.--pt.9.Michigan.--pt.10.Nevada-California.--pt.11.Pennsylvania.--pt.12.U.S.Treasury dept.,etc.--pt.13.Miscellaneous witnesses.--pt.14.Narcotics.--pt.15.Kentucky.--pt.16.Florida.--pt.17.Maryland and District of Columbia.--pt.18.New York and New Jersey.--pt.19.Pennsylvania.

Guide to rebuilding public sector services in stability operations : a role for the military /

This guide examines the role of restoration of public services within the broader context of stability operations. The extent to which public service reconstruction takes place depends on the mission, the level of resources, and the host country context. This paper provides guidance helpful to U.S. peacekeeping personnel in planning and executing stability operations tasks related to restoration of public sector services and infrastructure. It is designed to supplement existing and emerging guidance, and is specifically relevant to addressing the needs of public sector rebuilding in a post-conflict situation by peacekeeping forces. The material presented here draws both from theory and analytic frameworks and from on-the-ground experience of practitioners.

A treatise on the Holy Spirit and his operations. An exposition of the 130th Psalm. /

Each section has special t.p.