Estudio de algunos casos de fisuración descendente en carreteras españolas

Tradicionalmente se ha admitido que la mayor parte de las fisuras que aparecen en la superficie del pavimento procede de las capas inferiores, afectadas por la fatiga o por la retracción que acompaña al fraguado de materiales tratados con cemento. Con dicho enfoque las fisuras superficiales no serían más que la evolución o el reflejo de un problema originado en las capas inferiores. Sin embargo, en la última década diversos trabajos de investigación han puesto de manifiesto la relevancia de otro problema muy diferente: la iniciación de fisuras en la capa de rodadura que progresivamente van afectando a las capas inferiores. Es lo que se ha denominado fisuración descendente (top-down cracking). En este artículo se muestran varios casos estudiados en carreteras españolas, en los que se ha constatado que las fisuras observadas en la superficie afectaban sólo a la capa de rodadura, aunque en algunos casos habían progresado, dañando ya la parte superior de la capa intermedia. Para caracterizar las mezclas asfálticas afectadas por este problema, más generalizado de lo que se creía hasta ahora, al menos en determinadas zonas climáticas, se extrajeron testigos, comprobando la granulometría de las mezclas, sus características mecánicas y el estado del ligante. Como resultado general puede concluirse que las mezclas afectadas tenían problemas de segregación granulométrica en vertical, y en todos los casos el ligante había envejecido sensiblemente, a pesar de tratarse de actuaciones algunas de ellas con sólo unos pocos años en servicio.

Guía para un análisis estructurado de la programación estructurada

Se presenta un marco dinámico y contextual para la programacion estructurada, válido para otras técnicas de informática. Si se quiere hacer sintesis el marco hay que considerarlo en su sentido "top-down" 1 * pero si es de análisis de lo que se trata y es de lo que se trata en esta ponencia - el sentido es "bottom-up"

Guía para un análisis estructurado de la programación estructurada

Se presenta un marco dinámico y contextual para la programación estructurada, válido para otras técnicas de informática. Si se quiere hacer síntesis el marco hay que considerarlo en su sentido "top-down", pero si es de análisis de lo que se trata y, es de lo que se trata en esta ponencia; el sentido es "bottom-up"

Dynamic gamma frequency feedback coupling between higher and lower order visual cortices underlies perceptual completion in humans

To perceive a coherent environment, incomplete or overlapping visual forms must be integrated into meaningful coherent percepts, a process referred to as ?Gestalt? formation or perceptual completion. Increasing evidence suggests that this process engages oscillatory neuronal activity in a distributed neuronal assembly. A separate line of evidence suggests that Gestalt formation requires top-down feedback from higher order brain regions to early visual cortex. Here we combine magnetoencephalography (MEG) and effective connectivity analysis in the frequency domain to specifically address the effective coupling between sources of oscillatory brain activity during Gestalt formation. We demonstrate that perceptual completion of two-tone ?Mooney? faces induces increased gamma frequency band power (55?71 Hz) in human early visual, fusiform and parietal cortices. Within this distributed neuronal assembly fusiform and parietal gamma oscillators are coupled by forward and backward connectivity during Mooney face perception, indicating reciprocal influences of gamma activity between these higher order visual brain regions. Critically, gamma band oscillations in early visual cortex are modulated by top-down feedback connectivity from both fusiform and parietal cortices. Thus, we provide a mechanistic account of Gestalt perception in which gamma oscillations in feature sensitive and spatial attention-relevant brain regions reciprocally drive one another and convey global stimulus aspects to local processing units at low levels of the sensory hierarchy by top-down feedback. Our data therefore support the notion of inverse hierarchical processing within the visual system underlying awareness of coherent percepts.

El nuevo reto de relación con los clientes: Social CRM

La evolución de Internet al modelo Web 2.0, ha creado el nuevo sistema denominado Social Media, donde han proliferado un número ingente de redes sociales, que han cambiado las formas de relación y colaboración entre los usuarios, así como la relaciones de éstos y las empresas. En respuesta a estos dramáticos cambios sociales y tecnológicos, que actualmente están dando forma a las relaciones negocio-empresa, las empresas están descubriendo que es necesario modificar la estrategia de utilización del CRM (Customer Relationship Management) con sus clientes y desarrollar nuevas capacidades que permitan la creación de valor con los clientes. Y es aquí donde aparece el concepto de Social CRM, entendido como una estrategia centrada en entender, anticiparse y responder mejor a las necesidades de los clientes existentes o potenciales, aprovechando los datos sociales, para crear unas fuertes relaciones beneficiosas para ambas partes. En este trabajo se describe un modelo de adopción de Social CRM, aplicando un método de análisis “Top-Down”, y basado en el modelo de Gartner denominado “The Eight Building Blocks of CRM” [1]. El presente trabajo descompone el modelo de adopción descrito por Gartner, en los siguientes puntos. - Una decisión estratégica de la compañía - Asomarse a la realidad social - Analizar las redes sociales. - Metodología de adopción. - Despliegue y extensión en todos los departamentos de la compañía y la adaptación de los recursos humanos. - Selección e integración con las plataformas tradicionales de CRM - Análisis de herramientas de monitorización de Social CRM El modelo propuesto tiene dos objetivos, por un lado pretende proporcionar la visión de cómo CRM puede influir en los resultados empresariales en la era del cliente social, y por otro, proporcionar a los administradores cómo las inversiones y los recursos existentes de CRM puede ser integrados con las nuevas tecnologías y procesos para formar capacidades que pueden mejorar el rendimiento del negocio. ABSTRACT. “The Internet evolution to Web 2.0 model has created a new system called Social Media, where have proliferated a huge number of social networks which have changed the relationship and collaboration forms user-to-user and user-to-company. In response to these dramatic social and technological changes that are currently shaping the business-business relationships, companies are finding it necessary to modify the strategy for use of CRM (Customer Relationship Management) with customers and develop new capabilities to creating value with customers. And here is where the concept of Social CRM appears, understood as a focus on understanding, anticipating and responding to the needs of existing and potential customers strategy, leveraging social data to create a strong mutually beneficial relationships. In this paper describes an adoption model of Social CRM, using a "Top-Down" analysis method and based on the model of Gartner called "The Eight Building Blocks of CRM" [1]. This paper decomposes the adoption model described by Gartner in the following points. - A company strategic decision. - Look at social reality. - Analyze social networks. - Methodology adoption. - Deployment and extension in all departments of the company and the adaptation of human resources. - Selection and integration with traditional CRM platforms. - Analysis of monitoring tools for Social CRM. The proposed model has two objectives, firstly aims to provide insight into how CRM can influence business outcomes in the era of the social customer, and secondly, to provide administrators how investments and existing resources can be integrated CRM with new technologies and processes for developing capabilities that can increase business performance”.

A novel energy-driven computing paradigm for e-health scenarios

A first-rate e-Health system saves lives, provides better patient care, allows complex but useful epidemiologic analysis and saves money. However, there may also be concerns about the costs and complexities associated with e-health implementation, and the need to solve issues about the energy footprint of the high-demanding computing facilities. This paper proposes a novel and evolved computing paradigm that: (i) provides the required computing and sensing resources; (ii) allows the population-wide diffusion; (iii) exploits the storage, communication and computing services provided by the Cloud; (iv) tackles the energy-optimization issue as a first-class requirement, taking it into account during the whole development cycle. The novel computing concept and the multi-layer top-down energy-optimization methodology obtain promising results in a realistic scenario for cardiovascular tracking and analysis, making the Home Assisted Living a reality.

Advances on MBE selective area growth of III-nitride nanostructures: from nanoLEDs to pseudo substrates

The aim of this work is to provide an overview on the recent advances in the selective area growth (SAG) of (In)GaN nanostructures by plasma assisted molecular beam epitaxy, focusing on their potential as building blocks for next generation LEDs. The first three sections deal with the basic growth mechanisms of GaN SAG and the emission control in the entire ultraviolet to infrared range, including approaches for white light emission, using InGaN disks and thick segments on axial nanocolumns. SAG of axial nanostructures is eveloped on both GaN/sapphire templates and GaN-buffered Si(111). As an alternative to axial nanocolumns, section 4 reports on the growth and characterization of InGaN/GaN core-shell structures on an ordered array of top-down patterned GaN microrods. Finally, section 5 reports on the SAG of GaN, with and without InGaN insertion, on semi-polar (11-22) and non-polar (11-20) templates. Upon SAG the high defect density present in the templates is strongly reduced as indicated by a dramatic improvement of the optical properties. In the case of SAG on nonpolar (11-22) templates, the formation of nanostructures with a low aspect ratio took place allowing for the fabrication of high-quality, non-polar GaN pseudo-templates by coalescence of these nanostructures.

Del plan a la realidad: gobernanza y toma de decisiones en los procesos de regeneración urbana. El caso de Boston = From plan to reality: governance and decision-making in urban regeneration processes in Boston

En las últimas tres décadas, las dinámicas de restructuración económica a nivel global han redefinido radicalmente el papel de las ciudades. La transición del keynesianismo al neoliberalismo ha provocado un cambio en las políticas urbanas de los gobiernos municipales, que han abandonado progresivamente las tareas de regulación y redistribución para centrarse en la promoción del crecimiento económico y la competitividad. En este contexto, muchas voces críticas han señalado que la regeneración urbana se ha convertido en un vehículo de extracción de valor de la ciudad y está provocando la expulsión de los ciudadanos más vulnerables. Sin embargo, la regeneración de áreas consolidadas supone también una oportunidad de mejora de las condiciones de vida de la población residente, y es una política necesaria para controlar la expansión de la ciudad y reducir las necesidades de desplazamiento, promoviendo así ciudades más sostenibles. Partiendo de la hipótesis de que la gobernanza de los procesos de regeneración urbana es clave en el resultado final de las operaciones y determina el modelo de ciudad resultante, el objetivo de esta investigación es verificar si la regeneración urbana es necesariamente un mecanismo de extracción de valor o si puede mejorar la calidad de vida en las ciudades a través de la participación de los ciudadanos. Para ello, propone un marco de análisis del proceso de toma de decisiones en los planes de regeneración urbana y su impacto en los resultados de los planes, tomando como caso de estudio la ciudad de Boston, que desde los años 1990 trata de convertirse en una “ciudad de los barrios”, fomentando la participación ciudadana al tiempo que se posiciona en la escena económica global. El análisis se centra en dos operaciones de regeneración iniciadas a finales de los años 1990. Por un lado, el caso de Jackson Square nos permite comprender el papel de la sociedad civil y el tercer sector en la regeneración de los barrios más desfavorecidos, en un claro ejemplo de urbanismo “desde abajo” (bottom-up planning). Por otro, la reconversión del frente marítimo de South Boston para la construcción del Distrito de Innovación nos acerca a las grandes operaciones de regeneración urbana con fines de estímulo económico, tradicionalmente vinculadas a los centros financieros (downtown) y dirigidas por las élites gubernamentales y económicas (la growth machine) a través de procesos más tecnocráticos (top-down planning). La metodología utilizada consiste en el análisis cualitativo de los procesos de toma de decisiones y la relación entre los agentes implicados, así como de la evaluación de la implementación de dichas decisiones y su influencia en el modelo urbano resultante. El análisis de los casos permite afirmar que la gobernanza de los procesos de regeneración urbana influye decisivamente en el resultado final de las intervenciones; sin embargo, la participación de la comunidad local en la toma de decisiones no es suficiente para que el resultado de la regeneración urbana contrarreste los efectos de la neoliberalización, especialmente si se limita a la fase de planeamiento y no se extiende a la fase de ejecución, y si no está apoyada por una movilización política de mayor alcance que asegure una acción pública redistributiva. Asimismo, puede afirmarse que los procesos de regeneración urbana suponen una redefinición del modelo de ciudad, dado que la elección de los espacios de intervención tiene consecuencias sobre el equilibrio territorial de la ciudad. Los resultados de esta investigación tienen implicaciones para la disciplina del planeamiento urbano. Por una parte, se confirma la vigencia del paradigma del “urbanismo negociado”, si bien bajo discursos de liderazgo público y sin apelación al protagonismo del sector privado. Por otra parte, la planificación colaborativa en un contexto de “responsabilización” de las organizaciones comunitarias puede desactivar la potencia política de la participación ciudadana y servir como “amortiguador” hacia el gobierno local. Asimismo, la sustitución del planeamiento general como instrumento de definición de la ciudad futura por una planificación oportunista basada en la actuación en áreas estratégicas que tiren del resto de la ciudad, no permite definir un modelo coherente y consensuado de la ciudad que se desea colectivamente, ni permite utilizar el planeamiento como mecanismo de redistribución. ABSTRACT In the past three decades, the dynamics of global economic restructuring have radically redefined the role of cities. The transition from keynesianism to neoliberalism has caused a shift in local governments’ urban policies, which have progressively abandoned the tasks of regulation and redistribution to focus on promoting economic growth and competitiveness. In this context, many critics have pointed out that urban regeneration has become a vehicle for extracting value from the city and is causing the expulsion of the most vulnerable citizens. However, regeneration of consolidated areas is also an opportunity to improve the living conditions of the resident population, and is a necessary policy to control the expansion of the city and reduce the need for transportation, thus promoting more sustainable cities. Assuming that the governance of urban regeneration processes is key to the final outcome of the plans and determines the resulting city model, the goal of this research is to verify whether urban regeneration is necessarily a value extraction mechanism or if it can improve the quality of life in cities through citizens’ participation. It proposes a framework for analysis of decision-making in urban regeneration processes and their impact on the results of the plans, taking as a case study the city of Boston, which since the 1990s is trying to become a "city of neighborhoods", encouraging citizen participation, while seeking to position itself in the global economic scene. The analysis focuses on two redevelopment plans initiated in the late 1990s. The Jackson Square case allows us to understand the role of civil society and the third sector in the regeneration of disadvantaged neighborhoods, in a clear example of bottom-up planning. On the contrary, the conversion of the South Boston waterfront to build the Innovation District takes us to the big redevelopment efforts with economic stimulus’ goals, traditionally linked to downtowns and led by government and economic elites (the local “growth machine”) through more technocratic processes (top-down planning). The research is based on a qualitative analysis of the processes of decision making and the relationship between those involved, as well as the evaluation of the implementation of those decisions and their influence on the resulting urban model. The analysis suggests that the governance of urban regeneration processes decisively influences the outcome of interventions; however, community engagement in the decision-making process is not enough for the result of the urban regeneration to counteract the effects of neoliberalization, especially if it is limited to the planning phase and does not extend to the implementation of the projects, and if it is not supported by a broader political mobilization to ensure a redistributive public action. Moreover, urban regeneration processes redefine the urban model, since the choice of intervention areas has important consequences for the territorial balance of the city. The results of this study have implications for the discipline of urban planning. On the one hand, it confirms the validity of the "negotiated planning" paradigm, albeit under public leadership discourse and without a direct appeal to the leadership role of the private sector. On the other hand, collaborative planning in a context of "responsibilization" of community based organizations can deactivate the political power of citizen participation and serve as a "buffer" towards the local government. Furthermore, the replacement of comprehensive planning, as a tool for defining the city's future, by an opportunistic planning based on intervention in strategic areas that are supposed to induce change in the rest of the city, does not allow a coherent and consensual urban model that is collectively desired, nor it allows to use planning as a redistribution mechanism.

The genetic mediation of individual differences in sensitivity to pain and its inhibition

The underlying bases of the considerable interindividual variability in pain-related traits are starting to be revealed. Although the relative importance of genes versus experience in human pain perception remains unclear, rodent populations display large and heritable differences in both nociceptive and analgesic sensitivity. The identification and characterization of particularly divergent populations provides a powerful initial step in the genetic analysis of pain, because these models can be exploited to identify genes contributing to the behavior-level variability. Ultimately, DNA sequence differences representing the differential alleles at pain-relevant genes can be identified. Thus, by using a combination of “top-down” and “bottom-up” strategies, we are now able to genetically dissect even complex biological traits like pain. The present review summarizes the current progress toward these ends in both humans and rodents.

Multiple Perspectives on Academic Service-Learning Partnerships at the American University in Cairo: A Mixed Method Study

This mixed method study aimed to redress the gap in the literature on academic service-learning partnerships, especially in Eastern settings. It utilized Enos and Morton's (2003) theoretical framework to explore these partnerships at the American University in Cairo (AUC). Seventy-nine community partners, administrators, faculty members, and students from a diverse range of age, citizenship, racial, educational, and professional backgrounds participated in the study. Qualitative interviews were conducted with members of these four groups, and a survey with both close-ended and open-ended questions administered to students yielded 61 responses. Qualitative analyses revealed that the primary motivators for partners' engagement in service-learning partnerships included contributing to the community, enhancing students' learning and growth, and achieving the civic mission of the University. These partnerships were characterized by short-term relationships with partners' aspiring to progress toward long-term commitments. The challenges to these partnerships included issues pertaining to the institution, partnering organizations, culture, politics, pedagogy, students, and faculty members. Key strategies for improving these partnerships included institutionalizing service-learning in the University and cultivating an institutional culture supportive of community engagement. Quantitative analyses showed statistically significant relationships between students' scores on the Community Awareness and Interpersonal Effectiveness scales and their overall participation in community service activities inside and outside the classroom, as well as a statistically significant difference between their scores on the Community Awareness scale and department offering service-learning courses. The study's outcomes underscore the role of the local culture in shaping service-learning partnerships, as well as the role of both curricular and extracurricular activities in boosting students' awareness of their community and interpersonal effectiveness. Cultivating a culture of community engagement and building support mechanisms for engaged scholarship are among the critical steps required by public policy-makers in Egypt to promote service-learning in Egyptian higher education. Institutionalizing service-learning partnerships at AUC and enhancing the visibility of these partnerships on campus and in the community are essential to the future growth of these collaborations. Future studies should explore factors affecting community partners' satisfaction with these partnerships, top-down and bottom-up support to service-learning, the value of reflection to faculty members, and the influence of students' economic backgrounds on their involvement in service-learning partnerships.

Microcredit Financing Organizations: Global Players Empowering Women and Alleviating Poverty Worldwide

World poverty is a global issue and a development issue. Poverty reduction and women's empowerment are deeply connected to regional stability and long lasting peace. Nations will continue to be plagued by poverty, and top-down government agency aid programs to date have been unsuccessful. Encouraging news resides in innovative microfinance initiatives that alleviate poverty and impact millions of impoverished people around the globe. Microfinance organizations provide small loans, primarily to women otherwise excluded from the formal banking sector, for entrepreneurial endeavors. Myriad social, educational, and health programs accompany microfinance loan services. It is a powerful poverty-fighting tool with socioeconomic benefits. Evidence suggests that while imperfect, microfinance goals and successes are inspiring given the paucity of realistic alternatives in today's global development arena.

EU Policy on Climate Change Mitigation since Copenhagen and the Economic Crisis. CEPS Working Document No. 380, 5 March 2013

The EU has long assumed leadership in advancing domestic and international climate change policy. While pushing its partners in international negotiations, it has led the way in implementing a host of domestic measures, including a unilateral and legally binding target, an ambitious policy on renewable energy and a strategy for low-carbon technology deployment. The centrepiece of EU policy, however, has been the EU Emissions Trading System (ETS), a cap-and-trade programme launched in 2005. The ETS has been seen as a tool to ensure least-cost abatement, drive EU decarbonisation and develop a global carbon market. After an initial review and revision of the ETS, to come into force in 2013, there was a belief that the new ETS was ‘future-proof’, meaning able to cope with the temporary lack of a global agreement on climate change and individual countries’ emission ceilings. This confidence has been shattered by the simultaneous ‘failure’ of Copenhagen to deliver a clear prospect of a global (top-down) agreement and the economic crisis. The lack of prospects for national caps at the international level has led to a situation whereby many member states hesitate to pursue ambitious climate change policies. In the midst of this, the EU is assessing its options anew. A number of promising areas for international cooperation exist, all centred on the need to ‘raise the ambition level’ of GHG emission reductions, notably in aviation and maritime, short-lived climate pollutions, deforestation, industrial competitiveness and green growth. Public policy issues in the field of technology and its transfer will require more work to identify real areas for cooperation.

Collateral and Credit Rationing. The role of collateral in explaining and remediating the limited flow of credit to households and SMEs. ECRI Policy Brief No. 7, February 2014

European-wide data concerning both companies and households indicate that the credit rationing phenomenon, which has been predicted by theory, does in fact occur to a significant degree in the European credit market. Among SMEs, micro companies are most vulnerable and the current economic crisis has only made these concerns more pressing. Top-down use of the monetary transmission mechanism alone is insufficient to counter the problem. The other solution consists of a bottom-up, microeconomic stimulation of lending transactions, by focusing on collateral and guarantees. The data confirm the high importance that lenders – especially individual households and micro companies – attach to collateral and guarantees when making their lending decisions. As a consequence, we would argue that those parts of the law governing security interests and guarantees should be one of the primary targets for government policy aimed at improving credit flows, especially in avoiding a conflict between consumer protection measures and laws on surety and guarantees. This policy brief firstly aims to give an overview of the problem of credit rationing and to show that low-income households and SMEs are most concerned by the phenomenon. Focusing solely on loans as a way of financing and on the issues related to access to finance by micro and small companies as well households, it then sketches possible solutions focused on guarantees. This paper brings together data from the Eurosystem Household Finance and Consumption survey (HFCS), Eurostat, and both the latest wave of the extended biennial EC/ECB Survey on the access to finance of SMEs (EC/ECB SAFE 2013) and the latest wave of the smaller semi-annual ECB SAFE Survey, covering the period between October 2012 and March 2013.

Cities: The Juncker Commission should not miss this key to growth, jobs and the environment. CEPS Commentary, 3 October 2014

Cities, more particularly ‘smart’ cities, could become a catalyst for economic and social development. For this to happen, Europe will need a new type of integrated infrastructure, a new urban governance and policy structure, as well as new finance and business models. Successful smart projects will eventually develop into new business models and companies. While the European Commission cannot mandate or regulate this top down, it has a role to play in nurturing new initiatives to allow Europe the possibility of developing its own Google and Apple.

Citizenship in the discourse of Egyptian political parties. EUSpring Working Paper No. 6, June 2015 [also Citizenship Report no. 3]

The concept of citizenship is one of the most complicated in political and social sciences. Its long process of historical development makes dealing with it particularly complicated. Citizenship is by nature a multi-dimensional concept: there is a legal citizenship, referring first to the equal legal status of individuals, for instance the equality between men and women. Legal citizenship also refers to a political dimension, the right to start and/or join political parties, or political participation more broadly. Thirdly, it has a religious dimension relating to the right of all religious groups to equally and freely practice their religious customs and rituals. Finally, legal citizenship possesses a socio-economic dimension related to the non-marginalisation of different social categories, for instance women. All of these dimensions, far from being purely objects of legal texts and codifications, are emerging as an arena of political struggle within the Egyptian society. Citizenship as a concept has its roots in European history and, more specifically, the emergence of the nation state in Europe and the ensuing economic and social developments in these societies. These social developments and the rise of the nation state have worked in parallel, fostering the notion of an individual citizen bestowed with rights and obligations. This gradual interaction was very different from what happened in the context of the Arab world. The emerging of the nation state in Egypt was an outcome of modernisation efforts from the top-down; it coercively redesigned the social structure, by eliminating or weakening some social classes in favour of others. These efforts have had an impact on the state-society relation at least in two respects. First, on the overlapping relation between some social classes and the state, and second, on the ability of some social groups to self-organise, define and raise their demands. This study identifies how different political parties in Egypt envision the multi-dimensional concept of citizenship. We focus on the following elements: Nature of the state (identity, nature of the regime) Liberties and rights (election laws, political party laws, etc.) Right to gather and organise (syndicates, associations, etc.) Freedom of expression and speech (right to protest, sit in, strike, etc.) Public and individual liberties (freedom of belief, personal issues, etc.) Rights of marginalised groups (women, minorities, etc.)