Sunday, March 29, 2015

 

 



Soy un nuevo usuario

Olvidé mi contraseña

Entrada usuarios

Lógica Matemáticas Astronomía y Astrofísica Física Química Ciencias de la Vida
Ciencias de la Tierra y Espacio Ciencias Agrarias Ciencias Médicas Ciencias Tecnológicas Antropología Demografía
Ciencias Económicas Geografía Historia Ciencias Jurídicas y Derecho Lingüística Pedagogía
Ciencia Política Psicología Artes y Letras Sociología Ética Filosofía
 

rss_1.0 Clasificación por Disciplina

Nomenclatura Unesco > (22) Física

Mostrando recursos 45,601 - 45,620 de 70,065

45601. Portuguese real estate taxation, land use and noise - Cecília Rocha; António Carvalho
In 2003, Portuguese government issued the decree-law 287/2003, concerning Real Estate Taxation. Nominal valuation of urban property was considered outdated and in need for reassessment with a new evaluation system based on objective parameters (construction cost, built area, site location, construction quality and building purpose). The goal of this study is the analysis of noise influence on real estate values as Portuguese Noise Code enforces building restrictions on municipal urban areas exceeding established noise limits. At present, municipalities are defining noise classification maps (mixed/sensitive areas) and, with noise maps, will determine quot;conflict areas. On these areas, and until mitigation measures...

45602. Solving airline operations problems using specialized agents in a distributed multi-agent system - António Jesus Monteiro de Castro; Eugénio da Costa Oliveira
An airline schedule very rarely operates as planned. Problems related with aircrafts, crew members and passengers are common and the actions towards the solution of these problems are usually known as operations recovery. The Airline Operations Control Center (AOCC) tries to solve these problems with the minimum cost and satisfying all the required rules. In this paper we present the implementation of a Distributed Multi-Agent System (MAS) representing the existing roles in an AOCC. This MAS deals with several operational bases and for each type of operation problems it has several specialized software agents that implement different algorithms (heuristic, AI,...

45603. Caracterização acústica de cafés-concerto - A Carvalho; Alberto L. A. P. Machado
The goal of this work is to equip the project-architect with a tool easy to use, which supports him with helpful elements in the early stages of the conceptual phase of projecting Music-Clubs (rooms with a full capacity under 250 people, with live music or acting shows, with the possibility of consuming drinks or even light meals). Based on the eleven music-clubs studied in this work, it was possible to predict that the normalized reverberation time (RT) of these rooms (that is considering half of the room capacity) goes about 0.7 to 0.8 s for 500 to 2k Hz frequency...

45604. Zonamento acústico em pequenos aglomerados urbanos - Carlos Aquino Monte; A Carvalho; José A. Furtado Gomes
This paper presents a theoretical/practical analysis regarding the sound levels made by urban traffic within a medium size agglomeration in the Guarda district (Portugal) by in situ measurements of the continuous equivalent sound levels Ld, Le and Ln for the usual traffic conditions and residual sound levels. An avaliation of the practical consequences of the aplication of the European Union Directive 2002/49/CE and of the Portuguese decree-law 9/2007 of January 17.

45605. Ordenamento do território, ruído e impostos sobre a propriedade - Cecília Rocha; A Carvalho
The purpose of this study is the analysis of noise influence on real estate values calculated according to the Real Estate Taxation Code issued on 2003. The relationship quot;noise/real estate taxes was based on GIS analysis performed on Portuguese cities merging land use, noise maps, noise classification areas and location factors. The combination of all these elements provided the definition of conflictareas and then, the determination of the vacant land for construction and the inherent building potential. This building potential will not be effective as those real estate properties have excessive noise levels. Considering the location factor was possible to...

45606. Acoustical behaviour of a new lightweight partition made with gypsum board and cork - António Pedro O. Carvalho
The building construction development in Portugal has been changed by the gradual move to a general use of residential partitions made with increasingly light materials from the traditional heavy interior walls. A socioeconomic analysis of the Portuguese situation as it is concerned with the lodging policies and building construction industry, is briefly presented. An international comparison on this matter is shown using some economic parameters. The Portuguese situation is compared to 36 other countries. The main goal of this paper is to present a study of the acoustical behavior of lightweight partitions, especially those usually called sandwich-type and its experimental...

45607. Dynamic scenario simulation optimization - André Monteiro de Oliveira Restivo
The optimization of parameter driven simulations has been the focus of many research papers. Algorithms like Hill Climbing, Tabu-Search and Simulated Annealing have been thoroughly discussed and analyzed. However, these algorithms do not take into account the fact that simulations can have dynamic scenarios.In this dissertation, the possibility of using the classical optimization methods just mentioned, combined with clustering techniques, in order to optimize parameter driven simulations having dynamic scenarios, will be analyzed.This will be accomplished by optimizing simulations in several random static scenarios. The optimum results of each of these optimizations will be clustered in order to find a...

45608. Acoustic characterization of courtrooms by a multi-criteria method - Antonio P. O. Carvalho; Diana A. Vidal
This paper proposes a new multi-criteria analysis model to acoustically characterize a specific type of building: the courtrooms. A Courtroom is acoustically studied regarding several criteria: their speech intelligibility (within), speech privacy (to/from contiguous rooms) and intruding noise. These characteristics are evaluated by numerical parameters that describe the sound field within and the sound insulation given by their separating walls with bordering rooms or entrance hall, and the facade. In this paper several significant acoustic parameters are used and logically weighted to find a representative unique index of evaluation of the room, the GIAE (Global Index of Acoustic Evaluation) rated...

45609. Acoustic characterization of rehabilitated cloisters - A. P. O. Carvalho; S. R. C. Vilela
This paper presents the results of field measurements in eight rehabilitated cloisters of old monasteries in Portugal (length: 20 to 35 m and height: 3.3 to 6.3 m) regarding their acoustic behavior to two objective parameters: RT and RASTI. The goal is to characterize the acoustic effect of the rehabilitation done on theses spaces to adapt them to new uses. All these cloisters had recently their galleries#8217; openings to the central yard closed with glass panels. Simple formulas were obtained that relate among the objective acoustic parameters and between the acoustic and architectural parameters. This paper also presents the variation...

45610. Desenvolvimento do auto-conceito físico nas crianças e nos adolescentes - Luísa Faria

45611. Using Specialized Agents in a Distributed MAS to Solve Airline Operations Problems: a Case Study - António J. M. Castro; Eugénio Oliveira
An airline schedule very rarely operates as planned.Problems related with aircrafts, crew members andpassengers are common and the actions towards thesolution of these problems are usually known asoperations recovery. The Airline Operations ControlCenter (AOCC) tries to solve these problems with theminimum cost and satisfying all the required rules. In thispaper we present the implementation of a DistributedMulti-Agent System (MAS) representing the existing rolesin an AOCC. This MAS has several specialized softwareagents that implement different algorithms, competing tofind the best solution for each problem. We present a realcase study where a crew recovery problem is solved. Weshow that it is possible...

45612. Traffic noise influence on road network planning in Portugal - Cecília Rocha; Antonio Carvalho
This paper analyses the evolution of the Portuguese planning system (land use management and road network) along with the evolution of population#8217;s environmental awareness, especially regarding traffic noise. Until 2000, the ineffectiveness of noise legislation and the demographic movements towards the coastline, in conjunction with the European funding, created the adequate conditions to the development of Portuguese road network. In November 2000, a new Noise Code was approved which enforced municipalities and infrastructure#8217;s Authorities to take the appropriate measures to reduce noise levels wherever they exceed the legal noise limits and to create zoning maps, noise maps and noise conflict...

45613. Efeitos psicológicos da actividade física - José Luís Pais Ribeiro

45614. A new sound insulation lightweight concrete masonry block. Design and experimental characterization - Hipólito Sousa; A Carvalho; A. Melo
The purpose of this paper is to present an innovative design approach for a sound insulation lightweight concrete masonry unit made with expanded clay LECAÒ.This block is especially developed and suited for sound insulation between dwellings and presents an airborne sound insulation that allows realizing separating walls between different houses quicker and with lower costs. In the design phases different walls solutions and block geometry have been studied and tested to define the optimum solution. After the stabilization of the unit masonry geometry, a deep characterization of block and final walls has been made. The experimental work includes acoustical, physical...

45615. Acoustic characterization of historic cloisters in Portugal - A Carvalho; Anabela Carvalho
This paper presents the results of field measurements in 20 cloisters of old monasteries in Portugal (length: 15 to 55 m and height: 3.7 to 8.5 m) regarding their acoustic behavior to some objective parameters: RT, RASTI and background sound level. The individual results show, for instance, that the mean measured values in each cloister for RASTI were from 0.33 to 0.64 (with a global mean value of 0.50 for all rooms) and for the RT (1 kHz) were from 1.0 to 4.5 s (with a global mean of 2.5 s for all rooms). The evaluation of the sound level...

45616. Noise reduction by urban traffic management - Victor Desarnaulds; Gilbert Monay; A Carvalho
This papers reviews the main studies on traffic management and analyzes the numeric noise results of several current options. It was found that between speed cushions or humps the noise reduction is about 1 to 2 dB(A) but there is an increase of 2 to 3 dB(A) (depending on vehicle and hump types) and annoyance (harsh deceleration and acceleration) near the humps. Speed reduction induced by diminution of road width can lead to a noise reduction of 1 to 3 dB(A) especially if it is combined with other traffic management measures. Road noise models usually introduce a penalty up to...

45617. A prototype application for helping to teach how to read numbers - Vítor Manuel Ferreira Alves Carvalho; Diamantino Rui da Silva Freitas; Helder Filipe Patrício Cabral Ferreira; Dárida Fernandes; Fernando Pedrosa
Nowadays we see several multimedia math applications in support of teaching the basic operations, geometric analysis, algebra and other complex operations; however theres no math application for the children at starting school age that helps to teach how to read a number in Portuguese. The lt;i>Laboratory for Speech Processing, Electro Acoustics, Signals and Instrumentationlt;/i> (LPF-ESI) at the lt;i>Faculty of Engineering of the University of Portolt;/i> (FEUP), started a project using a text-to-speech (TTS) engine and a Visual Basic multimedia application in order to fulfil that gap.lt;br>A prototype has been produced, called quot;lt;i>A Quinta dos Númeroslt;/i>quot; (AQN) (lt;i>The Farm of Numberslt;/i>),...

45618. Simulação Física da Transformação entre Objectos através da Resolução da Equação Dinâmica de Equilíbrio em Imagens - R. R. Pinho; J. M. R. S. Tavares
Neste artigo será abordada uma metodologia que utiliza a resolução da equação dinâmica de equilíbrio para determinar/simular o campo de deslocamentos entre objectos deformáveis representados em imagens. Assim, dadas duas representações do mesmo objecto, ou de dois objectos distintos, atendendo a princípios físicos pode ser feita a estimação temporal (faseada) da sua transformação/deformação. Para traduzir a deformação existente entre as duas formas pode ser utilizada a energia de deformação global ou local. Essas energias, assim como as intensidades das cargas aplicadas podem ser utilizadas para representar as formas intermédias. A referida metodologia permite, também, a simulação exclusiva das componentes não...

45619. Utilização de Modelação Física e Técnicas de Optimização na Determinação de Correspondências entre Nodos de Objectos no Espaço Modal - L. F. Bastos; J. M. R. S. Tavares
Neste trabalho, é utilizada uma metodologia, previamente existente, baseada em modelação física, para o emparelhamento de dois objectos, constituídos por dados pontuais (nodos). Enquanto a referida metodologia utiliza uma abordagem local, neste artigo é apresentada uma aplicação de técnicas de optimização global, de forma a ser considerada a interacção entre todos os nodos. Foi também desenvolvida uma solução, aplicável a objectos do tipo contorno, após o emparelhamento habitual do tipo ?um com um?, que permite emparelhar satisfatoriamente (caso existam) os nodos em excesso. Neste artigo é também descrito um método utilizado para a determinação da transformação rígida existente entre dois...

45620. Utilização de modelação física e técnicas de optimização na determinação de correspondências entre nodos de objectos no espaço modal - Maria Luísa Ferreira dos Santos Bastos; João Manuel Ribeiro Silva Tavares
RESUMOA determinação de correspondências, entre imagens de objectos distintos ou de instantes diferentes de um mesmo objecto, é um processo útil em vários domínios da visão por computador, como por exemplo: o seguimento e análise do movimento/deformação de objectos, identificação e inspecção de peças industriais, etc.

 

Busque un recurso