Sound Apparatus
Mostrando 1-8 de 8 artigos, teses e dissertações.
-
1. Controle da diretividade sonora no espaço tridimensional por um arranjo esférico compacto de alto-falantes / Sound directivity control in a 3-D space by a compact spherical loudspeaker array
O controle angular da radiação sonora pode ser obtido utilizando um arranjo compacto de alto-falantes independentemente programáveis operando na mesma faixa de frequência. Geralmente, os alto-falantes são dispostos sobre uma estrutura de formato esférico seguindo a geometria de um sólido de Platão a fim de se obter uma configuração altamente simét
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/02/2010
-
2. Coabitação com um parceiro doente: avaliações das alterações neuroimunes e da forma de comunicação / Cohabitation with a sick cage mate: evaluations of neuroimune changes and of the way of communication
Several papers are showing relevant neuroimmune regulation and/or modulation during stress or diseases. The incorporation of biological and psychological models of humans conditions are of high relevance in neuroscience. Animals exhibit a variety of adaptative behaviors for communicating with conspecifics; communication between animals can be visual, tactile
Publicado em: 2010
-
3. Influence of intrapulpal pressure simulation on the bond strength of adhesive systems to dentin
The purpose of this study was to evaluate the influence of intrapulpal pressure simulation on the bonding effectiveness of etch & rinse and self-etch adhesives to dentin. Eighty sound human molars were distributed into eight groups, according to the permeability level of each sample, measured by an apparatus to assess hydraulic conductance (Lp). Thus, a simi
Brazilian Oral Research. Publicado em: 2008-06
-
4. Chant and enchant: the child sound media history destiny / Cantos e encantos: os rumos da história da mídia sonora para crianças no Brasil
The research aims to carry out a historiographic rising of the sound media works for children in Brazil. The central objective consists in offering a general and temporalized idea of the workmanships that have been considered significant, and propose criterias for approaching the object. The criteria to chose the workmanships was the following ones: a) the w
Publicado em: 2007
-
5. MECHANISM, BEHAVIOR AND EVOLUTION OF CALLING IN FOUR NORTH AMERICAN TREEFROGS / Mecanismos de produção de som em anfíbios norte americanos: biomecânica, comportamento e evolução
Acoustic communication in frogs is an important model system for the study of behavioral evolution in vertebrates. This study aimed to extend the current model on the mechanism of calling in frogs in order to strengthen the bridge between behavioral and physiological knowledge in the field. The limits and tradeoffs of sound production by the passive larynx w
Publicado em: 2003
-
6. Local Perceptions of Federal Block Grants
We report the results of a survey of California county medical societies and county health officers on federal health block grants. Survey respondents agreed that the existing network of health services funded through the federal block grants and the current statelocal apparatus for providing these services are sound. Most respondents do not recommend major
-
7. Channel gating forces govern accuracy of mechano-electrical transduction in hair cells
Sensory hair cells are known for the exquisite displacement sensitivity with which they detect the sound-evoked vibrations in the inner ear. In this article, we determine a stochastically imposed fundamental lower bound on a hair cell's sensitivity to detect mechanically coded information arriving at its hair bundle. Based on measurements of transducer curre
National Academy of Sciences.
-
8. Physical basis of two-tone interference in hearing
The cochlea uses active amplification to capture faint sounds. It has been proposed that the amplifier comprises a set of self-tuned critical oscillators: each hair cell contains a force-generating dynamical system that is maintained at the threshold of an oscillatory instability, or Hopf bifurcation. While the active response to a pure tone provides frequen
The National Academy of Sciences.