Search results for "Sound"

Física por un tubo. Mide la velocidad del sonido en el aire y diviértete con los tubos sonoros

2011

En este trabajo damos las claves para diseñar un conjunto de tubos sonoros de PVC que permiten realizar una ejecución musical en grupo con la participación de un gran número de personas sin cultura musical previa. Proponemos además la utilización de los tubos para el estudio cuantitativo de los fenómenos físicos involucrados en la generación del sonido con instrumentos de viento. Se describe la utilización de los tubos sonoros, en combinación con un ordenador y un programa de análisis de sonido, para el análisis de ondas estacionarias y la determinación de la velocidad de propagación del sonido en el aire mediante distintos procedimientos.

The effect of computer-assisted letter-sound correspondence training on learning to read in Zambia

2008

Perceived differences between natural and convolution reverberation types in 5.0 surround sound

2011

This Graduate Thesis investigates the perceived differences between natural and convolution reverberation in surround sound. Two spaces with distinct reverberation times were used for this study. Initially three musical excerpts from three instruments (Cello, Oboe, and Piano) were recorded in a dry studio environment. Then the Impulse Response (IR) of the spaces was captured using two methods: balloon burst and sine sweep. The dry excerpts were then recorded in the spaces to capture the natural reverberation pattern while the IRs were convolved with them to create the artificial reverberation excerpts. A listening test was then conducted using six perceptual scales to rate these 18 excerpts…

Atypical liver hemangiomas: characterization with SonoVue and pulse-inversion US

2006

Centrifugal (inside-out) enhancement pattern of liver hemangiomas on contrast-enhanced US

2006

TRANS-FUSIMO: Preliminary in-vivo animal results of MR-guided Focused Ultrasound of liver under respiratory motion

2018

Background: Treating liver tumors using FUS poses a great challenge due to the respiratory motion of the target and by the rib cage obscuring the anatomical location of the malignancy. In the EU FP7 project TRANS-FUSIMO (www.trans-fusimo.eu) a novel treatment software has been developed to support MR guided focused ultrasound treatment of liver lesions through electronic real-time beam steering of the ultrasound transducer. Prior to clinical use we conduct an in-vivo animal trial using the TRANS-FUSIMO treatment system (TTS) to evaluate the safety and the technical efficacy and efficiency of generation predefined necrotic lesions in the healthy liver. Material and Methods: The pre-clinical …

The outcomes of national literacy programs on basic reading skills in familiar language among Zambian early graders

2016

In Zambia the Ministry of General Education implemented two national literacy programs in order to improve low levels of reading; the Primary Reading Program (PRP) implemented from 1999 to 2014 and the Primary Literacy Program (PLP) piloted in some schools in 2014 before being scaled up. This research examines the acquisition of basic reading skills among learners in familiar languages at the end of grade 2 in the two national literacy programs. I examined assessment results separately for each program and compared the two with each other. Outcomes were observed on the basis of the Early Grade Reading assessment test battery given to random samples of children (n=393) in 40 schools from 4 d…

Ultrasound measurements in bone using an array transducer

2014

Development of ultrasound-assisted digestion methods for the determination of toxic element concentrations in ash samples by ICP-OES

2011

The present thesis introduces several ultrasound-assisted digestion methods developed for the determination of toxic element concentrations in ash samples by inductively coupled plasma optical emission spectrometry (ICP-OES). Ultrasound-assisted digestion is a quite new technique used for sample pre-treatment purposes, especially in difficult sample matrixes. Elements determined are As, Ba, Co, Cr, Cu, Ni, Pb, Sb, Sr, V, and Zn. Most of the elements determined exist at a trace or ultra trace level in ashes and most are potential risks in the environment or human body even at low concentrations. Most of the selected elements can be determined directly by ICP-OES, but for the determination of…

Neural generators of the frequency-following response elicited to stimuli of low and high frequency: A magnetoencephalographic (MEG) study.

2021

The frequency-following response (FFR) to periodic complex sounds has gained recent interest in auditory cognitive neuroscience as it captures with great fidelity the tracking accuracy of the periodic sound features in the ascending auditory system. Seminal studies suggested the FFR as a correlate of subcortical sound encoding, yet recent studies aiming to locate its sources challenged this assumption, demonstrating that FFR receives some contribution from the auditory cortex. Based on frequency-specific phase-locking capabilities along the auditory hierarchy, we hypothesized that FFRs to higher frequencies would receive less cortical contribution than those to lower frequencies, hence supp…