Noise Measurement
Mostrando 49-60 de 110 artigos, teses e dissertações.
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49. Corrections in the determination of the sound power level obtained through intensimetry technique / Correções na determinção do nivel de potencia sonora obtido atraves da tecnica da intensimetria
Many Brazilian cities are facing noise pollution problems. Traffic noise is the main cause of inconvenience followed by noise generated by equipments used in civil construction. In order to maintain a certain life quality level in large cities it is paramount to control noise emission and propagation generated by civil construction. Sound power level is an i
Publicado em: 2006
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50. Noise at the intermediary neonatal care unit of a university hospital in Ribeirão Preto-SP. / "Ruído na unidade de cuidado intermediário neonatal de um hospital universitário de Ribeirão Preto-SP"
This descriptive, exploratory and observational quantitative study aimed to determine ambient noise levels at the intermediary neonatal care unit of a university hospital in Ribeirão Preto-SP and dimension sound pressure levels (SPL) produced by air-conditioning, lamps at the nursing ward and the functioning of apnea monitors; alarms going off; open water t
Publicado em: 2006
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51. Identificação de sistemas "on-line", otimização e controle avançado com o filtro de Kalman estendido / On line system identification, advanced control and optimization with the (Extended) Kalman filter
In the continuing competition between it will be more and more necessary to optimize current chemical processes in real time. To be able to optimize a plant in real time, there have to be various aspects to be fulfilled, such as measurement, reliability of the measurement and prediction of the process behaviour. In this work some of the aspects of such an ad
Publicado em: 2006
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52. The utilization of Wavelets transforms in the extraction of characteristics and patterns recognition in ECG signals / Utilização das transformadas Wavelets na extração de características e no reconhecimento de padrão em um sinal de ECG
Presently doctors and medical professionals are having the aid of support systems for diagnosis which include in their data base expertise knowledge, acquired mainly through empirical observation of heuristics applied to their diagnosis which translate partially, to the technical application used. In the systems which aid diagnosis, more specifically in elec
Publicado em: 2006
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53. Proposal of a virtual environment of simulation using robust predictive control design applied to robotic joints / Proposta de um ambiente virtual de simulação para projeto de controlador preditivo robusto para juntas roboticas
Satisfying more and more severe specifications in the field of robotic joints control requires now implementation of advanced control laws. But, before applying these new strategies on the system, their validation within a realistic virtual environment, used for simulation and rapid prototyping purposes, is necessary. The aim of this work is first the elabor
Publicado em: 2006
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54. Acoustic assessment of classrooms of reduced dimensions trough impulsive tecchnique / Avaliação acustica de salas de aula de dimensões reduzidas atraves da tecnica impulsiva
The ideal acoustic conditions for an environment depend on the activity developed in it. In case of classrooms, to assure the sharpness of pronounced sounds, with sufficient intensity and without distortions it is necessary that the environment have a good acoustic execution, fostering learning. This preoccupation becomes even bigger when it comes to rooms d
Publicado em: 2006
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55. Teste de detecção de intervalos aleatórios de silêncio em crianças com história de otite média recorrente / Random gap detection test in children with recorrent otitis media
Introduction: otitis media is an inflammatory disease of middle ear that has greater occurrence on pediatric population, being considered a helth public problem all around the world. Peripheral ans fluctuanting hearing loss may be observed and this may cause a disturbance on the complex auditory stimuli perception, including speech. This altered auditory per
Publicado em: 2006
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56. PHASE NOISE OPTIMIZATION OF MICROWAVE OSCILLATORS / OTIMIZAÇÃO DO RUÍDO DE FASE DE OSCILADORES NA FAIXA DE MICROONDAS
In this dissertation, oscillators presenting optimized phase noise had been projected and develloped. Because of the limitation of the specter analyzer devices in the accurate measurements of the oscillators phase noise developed in the CETUC laboratories, it was implemented the measurement technique called Phase Detector Method. This technique consists on t
Publicado em: 2005
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57. Speech recognition in classroom noise of children from 4th grade of elementary school / Reconhecimento da fala de crianças da 4 série na presença do ruído da sala de aula
Learning process needs some optimal conditions in order to happen one of them is an adequate signal-to-noise ratio Voices teacher and background noise may be considerate when studying the influence of background noise on speech intelligibility of students at classroom In order to answer these questions this research has as goal to analyze the speech recognit
Publicado em: 2005
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58. Theoretical and experimental analysis of the acoustic filed irradiated by an hermetic compressor / Analise teorica e experimental do campo sonoro irradiado por um compressor hermetico
As características acústicas de compressores herméticos têm se tomado cada vez mais críticas no projeto destes equipamentos e as predições destas características ao longo do projeto, obrigatórias para a adequação deste produto às condições de consumo. Este trabalho apresenta um método de avaliação vibro-acústica de compressores herméticos
Publicado em: 2005
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59. Propriedades espectrais das plantas no infravermelho termal (2,5 - 14 um): da química ao dossel. / Spectral properties of plants in the thermal infrared (2.5 - 14 um): from the chemistry to the canopy.
This work explores the thermal infrared spectral properties of plants to evaluate how such data might be used in laboratory, field, and remote sensing studies of ecosystems, and to analyze diverse chemical aspects of plant species. Attenuated total reflectance (ATR) spectra of plant leaves display absorption bands caused by the fundamental molecular vibratio
Publicado em: 2005
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60. Financing and investment decisions of firms by overconfident and optimistic managers / Decisões de financiamento e de investimento das empresas sob a ótica de gestores otimistas e excessivamente confiantes
This research empirically investigates the possible impacts of cognitively biased managers on firmsfinancing and investment decisions. Specifically, two cognitive biases that are widely recorded in the behavioral and psychological literature are considered: optimism and overconfidence. The testable hypotheses are derived from a growing body of theories that
Publicado em: 2005