Macroscopic thermal entanglement due to radiation pressure

Can entanglement and the quantum behavior in physical systems survive at arbitrary high temperatures? In this Letter we show that this is the case for a electromagnetic field mode in an optical cavity with a movable mirror in a thermal state. We also identify two different dynamical regimes of generation of entanglement separated by a critical coupling strength.Comment: Accepted in Phys. Rev. Let

This plaza is mine: Decoding places with space syntax methodology

A place is a meaningful location, a space with a distinct character where life occurs. A place is an important source of our identity - a key to who we are. Our identity depends on our belonging to places. What is the difference between space and place? How is that a space becomes a place, a meaningful location with a sense of belonging? Is there any method which explain patterns and properties of space which are responsible for the generation of places in cities and buildings? Space Syntax is a method coined by Hillier and Hanson (1984) which correlates social content with spatial content of places. By understanding the relationship between spatial affordance and people behavior, this method can explain, in an analytical way, how a space works. In this presentation I propose to analyse the sense of place and self that we encountered in the plaza of Palazzo Adriano, the Sicilian village represented in the film of Giuseppe Tornatore "Cinema Paradiso" (1988), using space syntax methodology for decoding place attachment as well our sense of belonging to a place and a time that does not exist anymore.info:eu-repo/semantics/publishedVersio

Patterns in nature, emergent urbanism and the implicate order

This research is about the scientific understanding of the concept of "life" in urban space and its main purpose is to explain the underlying order that is present in organic cities. It was found that this order is emergent (bottom-up),a product of a self-organization, a fractal geometry that characterizes the geometries of Nature which is substantially different from the visual order (top-down) we are used to look at our cities.The biological metaphor in city planning has been used since the sixteenth century. However, this analogy has been made mainly because of its shape and appearance rather than by the investigation of their geometric properties and laws of formation. Checking the parallel between the geometries of Nature and the geometries of the organic city, through the recognition of a set of patterns and emergent properties I conclude with this work that these forms and structures emerge for the same reason: the constraints of physical space and the laws of nature are the same everywhere. Thesefundamental lawswhich governall live-systems phenomena showthat in spite of apparently amorphous growth of urban sprawl, resilient patterns emerge. Once we know the principles we can use them to improve our plans and designs. We shouldtrust to the self-organizingprinciples of cities rather than impose ideas of what theyshould look like.info:eu-repo/semantics/acceptedVersio

The city shape and its natural context

The subject of the present work is the study of the relationship between the city’s shape and its natural context. The ‘design’ of cities over a territory doesn’t happen independently of its natural context. The surface of the land has already its own form which determines the pattern of many cities. The climate characteristics also suggest different sites and forms of occupation. As a result of these constrains, man has made beautiful and sustainable urban landscapes over the time, especially those non-planned cities, called organic, generated, vernacular, spontaneous or geomorphic. Many of them, like the Mediterranean cities, have so strongly accepted the natural features, that it is possible to identify urban patterns according to its natural environment. The study of the urban form is associated to the idea of rational planning and the production of a model. The territory, as the base for our activities, has been seen many times as an element which generates irregularity to the urban form. The objective of the proposed paper is to show the relationship between the structural quality of the Portuguese traditional cities and its natural context. Starting from this point we try to explain the genesis and growth of urban forms, especially those called organic or geomorphic.info:eu-repo/semantics/acceptedVersio

The roots of 4IR in architecture: a military drawing machine used for space perception in architecture

This paper analyses how architecture became a pioneer discipline in digital interactivity research. It describes how that pioneer research derives from a lineage of researchers whose work spans more than two decades beginning in the early fifties. Military funds enabled the creation of the first computer graphic interfaces that evolved into a - drawing machine", the first interactive CAD, that made possible the role of architecture as a pioneering discipline in interactivity research. It is expected to demonstrate that the same architecture that nowadays uses mainly interactive digital design was one of first disciplines to research interactivity addressing a gap in the study of the link between architecture and interactivity.info:eu-repo/semantics/publishedVersio

Transforming housing typologies. Space syntax evaluation and shape grammar generation

This paper focuses on the transformation of housing typologies by using a grammar-based methodology assisted by the use of space syntax measures. In this paper we start by describing three different types of housing buildings regarding their functionality by using syntactic measures. The studied buildings were constructed in Lisbon from the 18th to the 20th century and are representative repetitive cases in the city. The buildings’ descriptions are then used as part of the systematization of rehabilitation principles for the transformation grammar. We concluded that the particular characteristics of those buildings enable specific rehabilitation strategies to be carried out and that those different strategies may be integrated in the general grammar framework but defining specific sub-grammars.info:eu-repo/semantics/publishedVersio

High efficiency coupling of photon pairs in practice

Multi-photon and quantum communication experiments such as loophole-free Bell tests and device independent quantum key distribution require entangled photon sources which display high coupling efficiency. In this paper we put forward a simple quantum theoretical model which allows the experimenter to design a source with high pair coupling efficiency. In particular we apply this approach to a situation where high coupling has not been previously obtained: we demonstrate a symmetric coupling efficiency of more than 80% in a highly frequency non-degenerate configuration. Furthermore, we demonstrate this technique in a broad range of configurations, i.e. in continuous wave and pulsed pump regimes, and for different nonlinear crystals

Trees and semi-lattices: analysing space configuration of two urban systems in Lisbon region

This study examines patterns of order and structure in street networks and its relationships with spatial life of two urban neighborhoods (housing estates). It explores the concepts of “tree” and “semi-lattice” as two different ways of looking and thinking about the structure of cities, each one generating a different form of life and community place (Alexander, 1965). The authors propose a configurational analysis of street networks of two urban plans designed according to different city ideologies and historical background. Based on space syntax methodology the street network was represented both as convex spaces and axial lines as nodes of a graph. The network was then analyzed in terms of the mathematical properties of the graph. The objective was to address a comparative study of structural properties of the urban street networks in order to speculate some implications on social life of each neighborhood. Syntactic measures have shown that conceptual designs have different spatial and social patterns both at global and local scales. It was corroborated that the difference between the characteristics of topological properties which reflects the mathematical principle of tree and semi-lattice is responsible for the different character of public life we found in each urban area.info:eu-repo/semantics/publishedVersio

Análise de associação genômica ampla baseada em conjunto de genes: implementação em R.

O objetivo deste trabalho é a criação de um pacote R (R CORE TEAM, 2014) que implemente quatro diferentes métodos de GSEA no contexto de GWAS, considerando adaptações para aplicação em espécies animais de interesse para a agricultura