118 research outputs found
Church of the Immaculate Conception, Port Ewen, N.Y., and out missions, Rev. Thomas O. Hanlon, Pastor.
No full textReview of Donald E. Miller, Kimon H. Sargeant, and Richard Flory (eds.), Spirit and Power: The Growth and Global Impact of Pentecostalism (Oxford Uni-versity Press, 2013).
No full textAn Ecumenist of the Spirit: The Legacy of David Charles Mainse
No full textThe paper attempts to explore the career and ministry of David Mainse as a link between classical Canadian Pentecostalism and the Charismatic Renewal. Evidence is provided of David's upbringing, character and strategic evangelism initiatives that permitted him to remain loyal to his own denominational roots while endearing himself to a wide range mainstream and Charismatic expressions
Evaluating the Ecological Impacts of Cultivating Genetically Modified Herbicide Tolerant (GMHT) Oilseed Rape and Maize: (2007-B-DS-1-S1) STRIVE Report
No full textThis report is published as part of the Science, Technology, Research and Innovation for the
Environment (STRIVE) Programme 2007–2013.Author has checked copyrigh
Are you sitting comfortably? The political economy of the body
No full textThe aim of this paper is to examine the relationship between the mass production of furniture in modern industrial societies and lower back pain (LBP). The latter has proven to be a major cost to health services and private industry throughout the industrialised world and now represents a global health issue as recent WHO reports on obesity and LBP reveal. Thus far there have been few co-ordinated attempts to deal with the causes of the problem through public policy. Drawing upon a range of sources in anthropology, health studies, politics and economics, the paper argues that this a modern social problem rooted in the contingent conjuncture of natural and social causal mechanisms. The key question it raises is: what are the appropriate mechanisms for addressing this problem? This paper develops an analysis rooted in libertarian social theory and argues that both the state and the capitalist market are flawed mechanisms for resolving this problem. There remains a fundamental dilemma for libertarians, however. Whilst the state and the market may well be flawed mechanisms, they are the dominant ones shaping global political economy. To what extent can libertarians work within these structures and remain committed to libertarian goals
Direct drive wind turbines: the effect of unbalanced magnetic pull on permanent magnet generators and bearing arrangements
No full textWind energy has been the fastest emerging renewable energy source over the last decade. The
overriding provisos to minimise greenhouse emissions and increasing concerns regarding
energy security have been the major inducements for many countries to make a resolute
transition to new and non-conventional power sources.
Direct-drive systems for wind turbines are potentially a more reliable alternative to gearbox
driven systems. Gearboxes are liable to significant accumulated fatigue torque loading with
relatively high maintenance costs. It is with this in mind that the primary focus of this research
is on direct-drive wind turbines.
Generators in direct-drive wind turbines tend to be of large diameter and heavier due to the
support structure required to maintain as small air-gap as possible between the stationary and
rotating parts of the generator. Permanent magnet generators (PMGs) are the most common
type to be used within direct-drive wind turbines nowadays.
Generators and other drive-train components in wind turbines experience significant varying
loads, which may lead to a bearing failure. These varying loads can lead to misalignment within
the drivetrain producing eccentricity between the generator rotor and stator. Rotor eccentricity
generates a magnetic force referred to as Unbalanced Magnetic Pull (UMP). The induced UMP
for the same rotor eccentricity is much higher in PMGs than induction generators because of
the higher permanent magnet magnetic field. UMP is an important issue requiring further
research. A part of this study provides a more detailed treatment of UMP under varying rotor
eccentricity regimes for various permanent magnet machine topologies.
The effect of UMP in direct-drive PMGs on the lifetime of the main bearing is a topic that
requires more research aimed at proposing design improvements and solutions. The hope being
that the availability of such solutions can be applied to practical reductions in operating costs.
In brief, identification of the root causes of failure and impacts on component lifetime remain
a subject of research. Establishing analytical tools for studying the impact of UMP on
component lifetime in direct drive wind turbines and identifying the prospects for air gap
winding machines using single bearing configuration are the two key areas for further research.
Firstly, this research aims to establish the relationship between bearing forces and different
types of eccentricities and UMP in direct drive machines. It is intended to use such models for
predicting bearing wear and fatigue. Secondly, this research aims to establish the analytical
tools for studying static, dynamic and tilting eccentricity in air-gap winding direct drive
generators. Such tools are used to increase the understanding of the dynamics of direct drive
PM generators. The final step of this study is using a multi-body simulation software
(SIMPACK) to initiate investigations and comparison by providing assessments of
electromagnetic interaction and internal drive-train loading for four possible designs for a
proposed 5MW direct-drive wind turbine in response to the loads normally seen by a wind
turbine. The four designs include: (a) iron-cored PM direct-drive generator supported by two
main bearings, (b) airgap winding PM direct-drive generator supported by two main bearings,
(c) iron-cored PM direct-drive generator supported by a single main bearing, (d) airgap winding
PM direct-drive generator supported by a single main bearing. An aero-elastic simulation code
(HAWC2) is used to extract the hub loads for different wind speeds corresponding to the
normal operation of the wind turbine. The dynamic eccentricity and its influence on the
electromagnetic interaction and consequential effects on bearing loading for all four designs is
examined to determine the most optimal support structural configuration for a direct-drive
system.
In summary, the main aim of this thesis is studying the effect of different types of rotor
eccentricities in different types of direct drive PMGs on the main bearing arrangements. The
results show that static rotor eccentricity has the maximum impact compared to the other types
of eccentricities. The main result of an eccentricity is the induced UMP which applies directly
as an extra force on the bearings. The influence of UMP on bearing wear is studied. This
influence is found to be significant in PM machines and should be considered when designing
the bearing stiffness. A 20% static rotor eccentricity in a PM machine is found to induce an
UMP that roughly equals third the total weight of the machine. A single bearing design for a
direct-drive wind turbine is proposed and compared with a conventional two-bearing design.
The results show that the Iron-cored PM direct-drive generator supported by two main bearings
design and airgap winding PM direct-drive generator supported by a single main bearing design
have advantages over the other two designs in this study
Superconducting Generators for Large Offshore Wind Turbines
No full textThis thesis has been submitted in fulfilment of the requirements for a postgraduate degree (e.g. PhD, MPhil, DClinPsychol) at the University of Edinburgh. Please note the following terms and conditions of use: • This work is protected by copyright and other intellectual property rights, which are retained by the thesis author, unless otherwise stated. • A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. • This thesis cannot be reproduced or quoted extensively from without first obtaining permission in writing from the author. • The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the author. • When referring to this work, full bibliographic details including the author, title, awarding institution and date of the thesis must be given
A new look at the pathogenesis of asthma
No full textAsthma is an inflammatory disorder of the conducting airways that has strong association with allergic sensitization. The disease is characterized by a polarized Th-2 (T-helper-2)-type T-cell response, but in general targeting this component of the disease with selective therapies has been disappointing and most therapy still relies on bronchodilators and corticosteroids rather than treating underlying disease mechanisms. With the disappointing outcomes of targeting individual Th-2 cytokines or manipulating T-cells, the time has come to re-evaluate the direction of research in this disease. A case is made that asthma has its origins in the airways themselves involving defective structural and functional behaviour of the epithelium in relation to environmental insults. Specifically, a defect in barrier function and an impaired innate immune response to viral infection may provide the substrate upon which allergic sensitization takes place. Once sensitized, the repeated allergen exposure will lead to disease persistence. These mechanisms could also be used to explain airway wall remodelling and the susceptibility of the asthmatic lung to exacerbations provoked by respiratory viruses, air pollution episodes and exposure to biologically active allergens. Variable activation of this epithelial-mesenchymal trophic unit could also lead to the emergence of different asthma phenotypes and a more targeted approach to the treatment of these. It also raises the possibility of developing treatments that increase the lung's resistance to the inhaled environment rather than concentrating all efforts on trying to suppress inflammation once it has become established.<br/
BioGUID: resolving, discovering, and minting identifiers for biodiversity informatics
No full text<b>Background</b>: Linking together the data of interest to biodiversity researchers (including specimen records, images, taxonomic names, and DNA sequences) requires services that can mint, resolve, and discover globally unique identifiers (including, but not limited to, DOIs, HTTP URIs, and LSIDs).
<b>Results</b>: BioGUID implements a range of services, the core ones being an OpenURL resolver for bibliographic resources, and a LSID resolver. The LSID resolver supports Linked Data-friendly resolution using HTTP 303 redirects and content negotiation. Additional services include journal ISSN look-up, author name matching, and a tool to monitor the status of biodiversity data providers.
<b>Conclusion</b>: BioGUID is available at http://bioguid.info/. Source code is available from http://code.google.com/p/bioguid/
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