The response of smoke detectors to pyrolysis and combustion products from aircraft interior materials

The following projects were completed as part of the effort to develop and test economically feasible fire-resistant materials for interior furnishings of aircraft as well as detectors of incipient fires in passenger and cargo compartments: (1) determination of the sensitivity of various contemporary gas and smoke detectors to pyrolysis and combustion products from materials commonly used in aircraft interiors and from materials that may be used in the future, (2) assessment of the environmental limitations to detector sensitivity and reliability. The tests were conducted on three groups of materials by exposure to the following three sources of exposure: radiant and Meeker burner flame, heated coil, and radiant source only. The first test series used radiant heat and flame exposures on easily obtainable test materials. Next, four materials were selected from the first group and exposed to an incandescent coil to provide the conditions for smoldering combustion. Finally, radiant heat exposures were used on advanced materials that are not readily available

Using Concept Maps to improve Scientific Communications

Scientic talks, like scientic papers, are an important part of the scientic communication process. Good oral presentation skills, are vital to educational sciences, as well as to many other fields. In the engineering community, such presentations offer, a quick outline of project proposals and progress reports. In the academic community, the ability to clearly transmit scientic information, in an oral presentation, is critical to both teaching and research. Over the last years, it has become apparent, to many educational researchers, that representing knowledge, in a visual format, allows one to better recognize and understand, incoming information. Since Novak, placed concept mapping on the educational agenda, it has become an increasingly popular advanced teaching and learning tool. Due mainly to the innovation of visual design software like CmapTool, the production and modication of Concept Maps is straightforward. While there are no strict rules about how to give a motivating and compelling presentation, there are some guiding principles which are easy to grasp and apply. The modern scientist must be able to create well organized, well delivered scientic talks. In this context, Concept Maps harness the power of our vision to understand complex information. We propose some ideas and resources based, on the use of concept maps to make the process of preparing and organizing good talks easier. In essence, good scientic talks must satisfy the following three goals: to connect with the audience, to direct and hold attention, and to promote understanding and memory. To accomplish these goals talk material must be elaborated carefully and logically. The plan to achieve them should have four parts: preparation, structure, design, and exposition. We focus our work on the first two parts of the plan, and supply some helpful guidelines on efective ways to prepare the scientic information, using conceptual maps with the software CmapTool

The strong global dimension of piecewise hereditary algebras

Let T be a tilting object in a triangulated category equivalent to the bounded derived category of a hereditary abelian category with finite dimensional homomorphism spaces and split idempotents. This text investigates the strong global dimension, in the sense of Ringel, of the endomorphism algebra of T. This invariant is expressed using the infimum of the lengths of the sequences of tilting objects successively related by tilting mutations and where the last term is T and the endomorphism algebra of the first term is quasi-tilted. It is also expressed in terms of the hereditary abelian generating subcategories of the triangulated category.Comment: Final published version. After refereeing, historical considerations were added and the length of the article was reduced: Introduction and Section 1 were reformulated; Subsection 2.1 was moved to Section 1 (with an abridged proof); Subsection 3.2 was reformulated (with an abridged proof); The proof in A.5 was rewritten (now shorter); And minor rewording was processed throughout the articl

XLIII Conferências de Genética Doutor Jacinto Magalhães: resumo das comunicações

Suplemento da revista Nascer & Crescer com os resumos dos Posters e Comunicações orais apresentadas durante as XLIII Conferências de Genética Doutor Jacinto Magalhães que decorreu no dia 28 de março de 2014, na cidade do Porto, Portuga

Hipertensão pulmonar na criança o que há de novo?: Resumo das comunicações

Suplemento da revista Nascer & Crescer com os resumos das Comunicações Livres apresentadas durante a Reunião Científica "Hipertensão pulmonar na criança: o que há de novo?" que decorreu no dia 13 de junho de 2014, na cidade do Porto, Portuga

Fault lines in education: dualization and diversification of pathways over 40 years of debate on education policy in Portugal

The creation of Vocational Education Courses in 2012 rekindled recurring debates that shaped the process of institutionalization of basic education in Portugal and brought to light tensions between the need to diversify education pathways and to ensure equity. A diachronic analysis of educational policies was conducted based on legislation, parliamentary speeches and newspaper articles. The analysis traced the process of dualization of education in Portugal and identified six different periods that help to better understand the reasons for the recent change. It also revealed a story where actors, narratives and solutions reappear, even in face of new realities, raising theoretical questions about what drives change in policy.info:eu-repo/semantics/publishedVersio

Holographic descriptions of large N gauge dynamics

We use the AdS/CFT correspondence to study different aspects of large N dynamics of gauge theories in the strongly coupled regime. We present three models designed to capture some of the physics present in QCD at low energies or QCD-type theories such as walking tecnhicolor. We use the D3/D7 system to study chiral symmetry breaking in two different contexts: In the first model we break chiral symmetry with an arbitrary running coupling which has a pion in its spectrum. We derive integral equations for the quark condensate and pion decay constant by matching our model to a low energy chiral lagrangian and discuss the implications for technicolor theories. In the second model we study the on set of chiral symmetry breaking at the edge of the conformal window in QCD in the Veneziano limit and show a BKT-type transition. Finally, in the context of AdS/QCD we extend the ”hard wall” model to include the tensor operator ¯φσμνψ dual to a two form satisfying a self duality condition and study numerically the spectrum of vector mesons