38 research outputs found
Ordering of organic molecules on templated surfaces
No full textThis thesis describes the controlled growth of molecular nanostructures using modified metallic and semiconductor surfaces. The Ag/Si(lll)-(root3 x root3),the Sn/Cu(100) surface alloy system and the Bi/Si(100) nanolines and (2xn) surfaces were all investigated as suitable substrates for the controlled growth of pentacene, (C22H14) or trimesic acid, (C6H3(COOH)3) organic molecules. The following techniques were used in this study; Scanning Tunnelling Microscopy (STM), Low Energy Electron Diffraction (LEED), Normal Incident X-Ray Standing Waves (NIXSW) and Temperature Programmed Desorption (TPD).
The room temperature growth and ordering of trimesic acid on the AgfSi(ll1)-(root3 x root3) surface was investigated. An oblique unit cell was determined and a model proposed for the highly ordered close-packed domains.
The discovery of a new submonolayer phase on Sn/Cu(100) and the re-examined known phase are discussed. New models for these reconstructions are proposed. Adsorption of trimesic acid at room temperature on the clean substrate the lowest Sn coverage phase were studied. Two new Sn coverage dependent structures were discovered and bonding schemes in upright and flat orientations are discussed.
BifSi(100)-(2xn) surface was exploited as a template for the ordered growth of pentacene, which exhibited orientation specific adsorption. The Bi/Si(100)-(2xn) single domain surface created on vicinal silicon was used to test the suitable of Daresbury 4.2 beamline for NIXSW Imaging experiments and the quality of the results are discussed
Strong inference from transect sign surveys : combining spatial autocorrelation and misclassification occupancy models to quantify the detectability of a recovering carnivore
No full textAcknowledgements We are very grateful for the input provided by Elizabeth Croose, Declan O'Mahony and Denise O'Meara on pine marten survey methodology and related constraints, which we hope this paper will go some way toward relieving. Christopher Sutherland was incredibly helpful in discussion of occupancy modelling techniques. We would also like to thank Thys Simpson, Colin McClean and Shaila Rao for arranging access to private estates for surveying. Funding — Forest Enterprise Scotland and the University of Aberdeen provided funding for the project. The Carnegie Trust supported the lead author, E. McHenry, in this research through the award of a tuition fees bursary.Peer reviewe
Translation of six poems by Blas de Otero
No full textIn 1992 the fifth anniversary of the birth of J. L. VIVES was commemorated. Many books and studies were published about this Renaissance writer. The author of this article was surprised to see no account about the stay and influence of Vives as a Pedagogue in England. The author pays attention to four first concise works that Vives wrote about the teaching and education of young people and which acted as guides and handbooks for the education of English youth, both boys and girls, in the XVIth and XVIIth centuries
Translation of six poems by Blas de Otero
No full textIn 1992 the fifth anniversary of the birth of J. L. VIVES was commemorated. Many books and studies were published about this Renaissance writer. The author of this article was surprised to see no account about the stay and influence of Vives as a Pedagogue in England. The author pays attention to four first concise works that Vives wrote about the teaching and education of young people and which acted as guides and handbooks for the education of English youth, both boys and girls, in the XVIth and XVIIth centuries
Translating Patrick Kavanagh
No full textThe following concerns the translation I did of a selection of the poetry of Patrick Kavanagh into Spanish, the first translation of this important Irish poet into the Spanish language. It recounts the motives which impelled me to try this daunting task as well as the guidelines I followed, the help I received and the pitfalls I encountered and, hopefully, survived. It looks at some of the images and expressions used by the author and which need to be explained to students and it essays a comparison with the poetry of Antonio Machado, another much loved poet
Using Ecological Dynamics and Expert Knowledge to Explore Expertise-Appropriate Practice Pedagogies for the Taekwondo Roundhouse Kick
No full textUsing a taekwondo skill, this thesis presents the application of ecological dynamics to technical coaching that may help in adapting to rapid developments in rules and technology. The thesis also demonstrates a framework for using the coaching-biomechanics interface to reveal knowledge that will benefit both coaches and researchers. The coaching-biomechanics interface seeks to integrate coaches’ experiential and researchers’ theoretical approaches to identify and solve the same problem. While the framework in this thesis builds on the literature on the coaching-biomechanics interface, it could potentially guide knowledge creation and dissemination in other fields. To this end, the research was designed with three studies that flowed into each other. First, the first study presented in Chapter 3 aimed to capture expert taekwondo coaches’ experiential knowledge of the critical variables that determine an effective roundhouse kick. Specifically, the coaches provided information on the variables they thought would contribute to scoring kicks in competition and those that would distinguish between intermediate and expert performers. The secondary aim was to evoke the coaching-biomechanics interface and translate the coaches’ knowledge into observable biomechanical variables for future investigation. The final aim was to elicit further expert knowledge to assess the usefulness of the resulting variables. The study presented in Chapter 4 examined expert-intermediate differences in the coach-identified and researcher-translated critical variables to verify their usefulness in determining expertise. Three-dimensional measurements were made on intermediate and expert participants while performing the kick in varying levels of representativeness, all of which are routinely used in taekwondo practice. To further increase representativeness, the participants kicked a live target (the author) who was wearing the competition approved body armour, and kick effectiveness was determined by the scoring average on the armour. Finally, the study presented in Chapter 5 investigated the effects of a six-week representative learning intervention in terms of the coach-identified and researcher-translated critical variables and kick effectiveness. A case-series design was used in which multiple single-subjects were observed. Comparisons were made to expert coordination from Chapter 4 with respect to variability changes in the front knee angle at cut, the front knee angle at kick, and the interpersonal distance at the cut between levels of representativeness.
In Chapter 3, six higher-order themes emerged from interviews of four expert taekwondo coaches: (1) hip flexibility, (2) balance, (3) control/coordination, (4) distance, (5) footwork, and (6) speed. These were supported by several sub-themes. By using the coaching-biomechanics interface, the authors translated each theme and sub-theme into biomechanical variables based on existing research and potential usefulness to coaching: (1) front knee height, (2) support foot balance, (3) foot velocity, (4) interpersonal distance, and (5) cut-kick transition speed. Two separate expert coaches appraised these variables in terms of understanding, importance, coachability, and differences in expertise.
Results shown in Chapter 4 that variability in the normalised knee angle at the cut reduced when a target was present (F (2, 18) = 6.09, p = .010, ηp2 = 0.404). Similarly, the variability in the normalised knee angle at the kick dropped considerably in the presence of a dynamic target (F (2, 18) = 4.28, p = .030, ηp2 = 0.323). Experts had greater variability than intermediates with respect in IPD at the cut (F (1, 9) = 7.386, p = .024, ηp2 = 0.451). These variables’ marginal significances and moderate effect sizes were taken as evidence of interaction and formed the basis for an expert model that may reflect responses to applied pedagogy in the following study.
While no pre-post differences were found in the observed variables as part of the study presented in Chapter 5, the limited implementation of the learning intervention appeared to result in emerging expert coordination patterns in the interpersonal distance at the cut. Although the changes in coordination did not produce clear immediate or lingering post-intervention scoring improvements, elements of this study’s learning intervention could easily be adopted to coaching practice and future research.
With an ecological dynamics framework, this thesis used a more representative research design to examine a model for the coaching-biomechanics interface. Taken together these studies support the use of expert coach knowledge as a device for analysis and communication between sport scientists and coaches. These conclusions are however limited by the availability of relevant expertise, which in turn left several results underpowered. Much has been learned about taekwondo from this thesis, some of which may be generalised to other combat sports. However, the author would like to highlight the coaching-biomechanics interface, the fruitful collaboration between researchers and coaches, an approach that hopefully inspires more efforts to close the gap between research and practice
A study of occupational health and safety management in Irish veterinary practices
No full textIt is widely acknowledged within the literature that veterinary professionals are faced
with a unique set of occupational health and safety risks. High levels of work-related
infections, disease and injuries have been reported in Australia, the United States and
more recently in the United Kingdom. However, to date no empirical research has been
conducted into the management of occupational health and safety risks in an Irish
context.
The main aim of this study is to address the lack of Irish data on the management of
occupational health and safety in veterinary practices - including but not limited to;
where the majority of Irish veterinary practices currently source their occupational
health and safety information and to critically assess how basic seven specific
occupational health hazards are currently managed within Irish veterinary practices.
An on-line questionnaire was distributed to a selection of Irish Veterinary practices
using a systematic random sampling technique. In addition to this, four semi-structured,
interviews were also conducted with a variety of veterinary professionals. A total of 56
practices (52%) responded of which 100% were eligible for inclusion in the study. Of
these practices 50% were small-animal, 34% were mixed-animal, 9% were equine, 4%
were large-animal and 4% were a combination of two or more of the aforementioned
practice types. Ninety-eight per cent of responding practices had a written safety
statement. However, only 79% had allocated a staff member responsible for health &
safety within the practice and only 67% of practices stated that a staff member had
completed some form of basic Health and safety training. Both psychosocial and
manual handling health hazards appeared to be relatively overlooked by practices, with
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77% of practice reporting having no policy in relation to occupational stress and 75% of
interviewees reporting manual handling as an issue.
This study concludes that Irish veterinary practices rely heavily on both the Health and
Safety Authority’s Website and the professional body, Veterinary Ireland, for
occupational health and safety information and advice. There also appears to be a lack
of personnel competently trained in health and safety employed within Irish veterinary
practices. The author concludes that this could be a contributing factor in the observed
insufficiencies in the management of health and safety within Irish veterinary practices
Ischaemia reperfusion injury: mechanisms of progression to chronic graft dysfunction
No full text\ua9 2018 The Author(s) The increasing use of extended criteria organs to meet the demand for kidney transplantation raises an important question of how the severity of early ischaemic injury influences long-term outcomes. Significant acute ischaemic kidney injury is associated with delayed graft function, increased immune-associated events and, ultimately, earlier deterioration of graft function. A comprehensive understanding of immediate molecular events that ensue post-ischaemia and their potential long-term consequences are key to the discovery of novel therapeutic targets. Acute ischaemic injury primarily affects tubular structure and function. Depending on the severity and persistence of the insult, this may resolve completely, leading to restoration of normal function, or be sustained, resulting in persistent renal impairment and progressive functional loss. Long-term effects of acute renal ischaemia are mediated by several mechanisms including hypoxia, HIF-1 activation, endothelial dysfunction leading to vascular rarefaction, sustained pro-inflammatory stimuli involving innate and adaptive immune responses, failure of tubular cells to recover and epigenetic changes. This review describes the biological relevance and interaction of these mechanisms based on currently available evidence
Design and utility assessment of attitude control systems for EVA task performance
No full textThesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2015.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 191-196).Low gravity astronaut extravehicular activity (EVA) missions using a maneuvering Jetpack and robotic servicing and assembly missions could benet from spacecraft systems capable of maintaining pointing stability during critical operations. The addition of single-gimbal control moment gyroscopes (CMGs) to the attitude control system of these spacecraft could substantially improve the stability and pointing accuracy of the platform and could also conserve onboard fuel during missions. This thesis contains a description of recent work completed at Draper Laboratory and MIT's Space Systems Laboratory (SSL) and Man Vehicle Laboratory (MVL) that explores the performance and utility of a combined control concept for a Jetpack system using thrusters and CMGs as actuators. Simulation of the Mobility Augmenting Jetpack with Integrated CMGs (MAJIC) at Draper is described as well as the design, integration and physical demonstration of a combined control system with the Synchronized Positoin Hold Engage Reorient Experimental Satellite (SPHERES) facility at the SSL. Primary contributions in simulation for the Jetpack application have focused on implementing a new method for sizing CMG actuators and improving the performance and utility assessment strategies to compare a proposed MAJIC system with a Jetpack that does not include CMGs. Primary contributions with hardware within the context of the SPHERES facility have included the design, simulation, integration and testing of a CMG peripheral actuator package and associated laboratory and reduced-gravity testing with NASA's Flight Opportunity Program.by Todd F. Sheerin.S.M
