Wave-packet treatment of neutrino oscillations and its implications on determining the neutrino mass hierarchy

We derive the neutrino flavor transition probabilities with the neutrino treated as a wave packet. The decoherence and dispersion effects from the wave-packet treatment show up as damping and phase-shifting of the plane-wave neutrino oscillation patterns. If the energy uncertainty in the initial neutrino wave packet is larger than around 0.01 of the neutrino energy, the decoherence and dispersion effects would degrade the sensitivity of reactor neutrino experiments to mass hierarchy measurement to lower than 3 $\sigma$ confidence level

Hong Kong Children's Musical Theatre : how is it Hong Kong?

published_or_final_versionMedia, Culture and Creative CitiesMasterMaster of Social Sciences in Media, Culture and Creative Citie

Coupled length scales in eroding landscapes

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1999.Includes bibliographical references (leaves 75-76).We propose a method to study natural topography by means of local transform. A nonlinear local transform Alc[h(x)] of the elevation field h(x) is used to determine a director field of anisotropy a(x). The director field is directly related to local small-scale channel-like features. From study of the correlations of these with large-scale structure of drainage basins, characteristic coupling length scales are found which indicate an important breaking of scale invariance. We also show that these length scales are related to the average sizes of the individual drainage basins. Our study demonstrates one way in which landscape patterns of unknown origin may be quantitatively analyzed to determine the kind of mechanisms that have eroded them.by Kelvin Ka Wing Chan.S.M

Prevalence of dysphagia and adequacy of related care for elderly receiving residential care services in Hong Kong

The current study was divided into two phases. Phase 1 of the study aimed to investigate the prevalence rate of dysphagia in the geriatric population receiving residential care services in Hong Kong, while phase 2 aimed to evaluate the adequacy of the current care services provided to these elderly to overcome dysphagia. In phase 1 of the study, 3609 residents from 30 government-subsidized residential homes were included. A prevalence rate of 62.2% was found in the current study by chart review, which was consistent with previous studies. In phase 2 of the study, 282 residents from 12 government-subsidized residential homes were included. The participants were required to complete assessments for cognitive, swallowing and oral-motor functions. Dysphagic participants as identified from clinical swallowing examination were also required to complete a self-developed questionnaire on swallowing-related service. The passing rate of the swallowing-related service questionnaire was 19.3%. The mean score was 6.18 ± 5.54 out of 24. Recommendations to increase public funding for speech therapy services and education about the speech therapy profession for the targeted population were made.published_or_final_versionSpeech and Hearing SciencesBachelorBachelor of Science in Speech and Hearing Science

Vocal tract dimensions and vocal fold vibratory characteristics of professional singers of different singing voice types

This study aimed to examine the relationship between different singing voice types and their vocal fold vibratory characteristics and vocal tract dimensions. A total of 19 tenors, 10 baritones, 29 sopranos, and 4 mezzo-sopranos participated in the study. Electroglottography (EGG) was used to measure the vocal fold vibratory characteristics, based on which parameters including open quotient (Oq) and fundamental frequency (F0) were derived. During the experiment, the participants sang the song “Happy Birthday” with constant loudness level and at the most comfortable pitch level. A pharyngometer was used to measure singers’ vocal tract dimensions. Results showed that tenors had significantly higher Oq/F0 gradient than baritones in chest and head registers, while sopranos had generally higher Oq/F0 gradient than mezzo-sopranos in chest and head registers. Regarding vocal tract dimensions, sopranos generally exhibited greater vocal tract length and volume values than mezzo-sopranos. The present study provides insights to applying both vocal fold vibratory characteristics and vocal tract dimensions in voice classification for male and female singers.published_or_final_versionSpeech and Hearing SciencesBachelorBachelor of Science in Speech and Hearing Science