1,193 research outputs found
Cumulative Trauma Disorders: Their Recognition and Ergonomic Measures to avoid them
No full textCumulative Trauma Disorders (CTD) refers to a large category of disorders of the muscles, tendons, or nerves and are the summary results of microtrauma caused, precipitated, or aggravated by repeated exertion or movements of the body. They go by many names in the literature. They have become a matter of urgent ergonomic concerns for manufacturers, insurance companies, health care provides, and government agencies. Since CTD are usually caused by repeated and/or forceful exertions, often in the hand-arm-shoulder region. They predominantly occur to soft tissues, such as tendons and ligaments, and to nerves and blood vessels. They are commonly associated with certain occupational and leisure activities. Many CTD can be avoided by a set of fairly simple and straightforward ergonomic procedures. In this presentation, the author will share his views on the epidemiology, pathogenesis and treatment including the ergonomic measures to avoid CTD
Realisation of photonic Hilbert transformer with a simple planar Bragg grating
No full textPhotonic Hilbert transformers (PHTs) are desirable for the direct processing of optical signals at high speeds and operation bandwidths, allowing optical networks to outperform current electronic technologies. We practically demonstrate a photonic Hilbert transformer in planar geometry; utilising a pi-phase shift planar Bragg grating with proper apodization profile. The device is fabricated by direct UV grating writing technology in silica-on-silicon [1]. The PHT has a pi-phase shift at the zero point of the frequency response, whereas the amplitude remains constant. The pi-phase shift in PHT is simply induced by placing a pi-phase shift in the refractive index modulation. The constant amplitude is achieved by precise apodization of the grating coupling strength, while the apodization profile is given by [2]. With our current direct UV writing technology, the proposed grating can be fabricated in a much higher accuracy then the conventional fibre Bragg grating manufacturing technique. We will present our latest work on more complex apodized gratings to obtain the ideal realisable frequency and temporal responses for PHTs
All-optical signal processing using planar Bragg gratings
No full textThe fabrication techniques of Bragg gratings broadly fall into two categories: that are holographic, and that are non-interferometric, based on the periodical UV radiation along the photosensitive medium. The fabrication technique in this work is the direct UV grating writing (DGW). This method involves focusing two crossed laser beams (lambda=244nm) into a photosensitive core layer. Precise translation of the sample and modulation of the interference pattern define the channel waveguide and simultaneously create grating structures, shown in Figure 1. First developed at Optoelectronics Research Centre in 2002, it has similarities to the UV writing techniques used for fiber Bragg grating inscription. Advanced grating properties such as chirp, phase shifts, and apodisation are introduced by adjusting the laser intensity and the translating speed
Simple planar Bragg grating devices for photonic Hilbert transform
No full textHilbert transformers are important devices widely used in information processing and signal analysis in the electronic domain. For example, for spectral efficiency improvement, it is used to construct the analytic signal for single sideband (SSB) modulation from a real signal. Photonic Hilbert transformers (PHTs) are proposed for a similar range of applications and would allow the direct processing of optical signals at bandwidths far beyond current electronic technologies
How Hong Kong students learn using the study process questionnaire: Cross-cultural comparisons
No full textAnecdotal evidence abounds in Hong Kong to the effect that students entering tertiary education are predisposed to a “rote” learning approach. Until the research studies at City Polytechnic of Hong Kong and Hong Kong Polytechnic, there have been no systematic studies performed locally and as such in the absence of cross-cultural research, there is a tendency to rely on anecdotal statements about Hong Kong students’ approaches to learning. This study was designed to see if Hong Kong Chinese students predisposed to a surface or deep approach to learning react differently when moving progressively from one stage to the next stage in their undergraduate occupational therapy curriculum. This study adopted a longitudinal design method which followed a cohort of 80 undergraduate occupational therapy students over two years and measured their changes in their approaches to learning using the Biggs’ Study Process Questionnaire The internal consistency reliability estimates alpha for SPQ scales for samples of Hong Kong, Australian and British students was compared. The alpha estimates of this study varied from 0.56 to 0.75 which compares favourably with other studies reported in Hong Kong, Australia and U.K. The results of this study indicated that the Hong Kong Chinese students demonstrated a higher mean for the deep approach to learning (47.3 in Year 1 and 46.3 in Year 3) and a lower mean for the surface approach (42.7 in Year 1 and 42.4 in Year 3), similar to other Hong Kong studies from other tertiary institutions in Hong Kong and Australia. From the findings, it is reasonable to conclude that students change their approach according to the different demands imposed by their varied learning needs. Based on this belief, the author while ruling out the potential for misunderstandings about Asian students, draws attention to the cross-cultural differences in approaches to learning which highlights on the changing nature of tertiary classroom and the implications for teaching and learning, with the major shift in the characteristic of student population
UV-written planar chirped Bragg gratings for use in dispersion management
No full textWe demonstrate for the first time experimental results of chirped and chirp-apodized Bragg gratings written into planar substrates. The gratings are written using Direct Grating Writing, allowing both buried channels and gratings to be defined simultaneously. The experimental results are then compared to theory and agree well with predicted spectra
Realization of a planar Bragg grating for all-optical Hilbert transformer
No full textAn all-optical Hilbert transformer is proposed and demonstrated experimentally. We preliminarily show that an all optical Hilbert transformer can be implemented using an apodized planar Bragg grating with a single pi phase-shift. The proposed planar Bragg grating is fabricated by Direct UV writing technology in silica-on-silicon
DIOPTRA-L: Digital Opinions on Translated Literature
No full textA collection of reviews from Goodreads of various well-known fiction and non-fiction books, and their translations. The metadata has been enriched with computed and annotated values:
- the identifier of the review
- the title of the reviewed book
- the original language in which the book was published
- the edition to which the review refers
- the text of the review
- the language of the review (computed)
- the author of the review (username which cannot be related to a person)
- a computed estimate of the author gender (based on the username)
- the age category of a book's target audience (children / young adult / adult), annotated by experts
- the genre of the book, annotated by experts
- the star rating of the book (1 to 5)
- the tokenised text of the review
- whether or not the review mentions translation (0 for false,1 for true)
- how many tokens are in the review
- how many translation lemmas were found in the revie
Novel Technique for Strengthening Steel Beams with Web Penetrations
Full text linkAbstract—The introduction of web openings decreases the strength and stiffness of steel beams, thus compromising design requirements.. This paper presents a novel method to maintain cross-sectional capacity and stiffness through the bonding of CFRP plates with different lengths and thicknesses
Novel Technique for Strengthening Steel Beams with Web Penetrations
Full text linkAbstract—The introduction of web openings decreases the strength and stiffness of steel beams, thus compromising design requirements.. This paper presents a novel method to maintain cross-sectional capacity and stiffness through the bonding of CFRP plates with different lengths and thicknesses
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