7,259 research outputs found
Dual-frequency GPS survey for validation of a regional DTM and for the generation of local DTM data for sea-level rise modelling in an estuarine salt marsh
Global average temperatures have risen by an average of 0.07°C per decade over the last
100 years, with a warming trend of 0.13°C per decade over the last 50 years.
Temperatures are predicted to rise by 2°C - 4.4°C by 2100 leading to global average sealevel
rise (SLR) of 2 – 6mm per year (20 – 60cms in total) up to 2100 (IPCC 2007) with
impacts for protected coastal habitats in Ireland.
Estuaries are predominantly sedimentary environments, and are characterised by shallow
coastal slope gradients, making them sensitive to even modest changes in sea-level. The
Shannon estuary is the largest river estuary in Ireland and is designated as a Special Area
of Conservation (SAC) under the EU Habitats Directive (EU 1992) providing protection
for listed habitats within it, including estuarine salt marsh.
Trends in Shannon estuary tidal data from 1877 – 2004 suggest an average upward SLR
trend of 4 - 5mm/yr over this period. A simple linear extension of this historical trend
would imply that local SLR will be in the region of 40 - 45cm by 2100. However, this
may underestimate actual SLR for the estuary by 2100, since it takes no account of
predicted climate-driven global SLR acceleration (IPCC 2007) up to 2100
Implementable Wireless Access for B3G Networks - III: Complexity Reducing Transceiver Structures
This article presents a comprehensive overview of some of the research conducted within Mobile VCE’s Core Wireless Access Research Programme,1 a key focus of which has naturally been on MIMO transceivers. The series of articles offers a coherent view of how the work was structured and comprises a compilation of material that has been presented in detail elsewhere (see references within the article). In this article MIMO channel measurements, analysis, and modeling, which were presented previously in the first article in this series of four, are utilized to develop compact and distributed antenna arrays. Parallel activities led to research into low-complexity MIMO single-user spacetime coding techniques, as well as SISO and MIMO multi-user CDMA-based transceivers for B3G systems. As well as feeding into the industry’s in-house research program, significant extensions of this work are now in hand, within Mobile VCE’s own core activity, aiming toward securing major improvements in delivery efficiency in future wireless systems through crosslayer operation
Intra-assessor consistency in question answering
In this paper we investigate the consistency of answer assessment in a complex question answering task examining features of assessor consistency, types of answers and question type
University of Strathclyde at TREC HARD
The motivation behind the University of Strathclyde's approach to this years HARD track was inspired from previous experiences by other participants, in particular research by [1], [3] and [4]. A running theme throughout these papers was the underlying hypothesis that a user's familiarity in a topic (i.e. their previous experience searching a subject), will form the basis for what type or style of document they will perceive as relevant. In other words, the user's context with regards to their previous search experience will determine what type of document(s) they wish to retrieve
Contextual information and assessor characteristics in complex question answering
The ciqa track investigates the role of interaction in answering complex questions: questions that relate two or more entities by some specified relationship. In our submission to the first ciqa track we were interested in the interplay between groups of variables: variables describing the question creators, the questions asked and the presentation of answers to the questions. We used two interaction forms - html questionnaires completed before answer assessment - to gain contextual information from the answer assessors to better understand what factors influence assessors when judging retrieved answers to complex questions. Our results indicate the importance of understanding the assessor's personal relationship to the question - their existing topical knowledge for example - and also the presentation of the answers - contextual information about the answer to aid in the assessment of the answer
Derivation of a dynamic model of the kinetics of nitrogen uptake throughout the growth of lettuce : calibration and validation
A kinetic model of nitrogen (N) uptake throughout growth was developed for lettuce
cultivated in nutrient solution under varying natural light conditions. The model couples
nitrogen uptake with dry matter accumulation using a two-compartment mechanistic
approach, incorporating structural and non-structural pools. Maximum nitrogen uptake
rates are assumed to decline with shoot dry weight, to allow for the effects of plant
age. The model was parameterized using data from the literature, and calibrated for
differences in light intensity using an optimization algorithm utilizing data from three
experiments in different growing seasons. The calibrated model was validated against
the data from two independent experiments conducted under different light conditions.
Results showed that the model made good predictions of nitrogen uptake by plants from
seedlings to maturity under fluctuating light levels in a glasshouse. Plants grown at a
higher light intensity showed larger maximum nitrogen uptake rates, but the effect of
light intensity declined towards plant maturity
Attributions for Rejection and Acceptance in Young Adults with Borderline and Avoidant Personality Features
Individuals with borderline and avoidant personality disorders show interpersonal dysfunction that includes maladaptive responses to rejection and reduced emotional benefits from acceptance. To identify the attributional styles that may underlie these difficulties, we examined causal attributions for rejection and acceptance among undergraduates high in features of each disorder and a healthy comparison group. In Study 1, participants rated how likely they were to attribute hypothetical rejection and acceptance experiences to positive and negative qualities of the self and others, as well as external circumstances. In Study 2, we examined these same attributions in daily diary assessments of real rejection and acceptance experiences. Although the two studies showed some differences in results, they both linked borderline personality features with suspicious, selfbolstering responses and avoidant personality features with perceived inferiority. Distinct attributional styles may contribute to the distinct interpersonal problems characteristic of these conditions
GPS verification of National Mapping Agency topographical data for generation of high-accuracy GPS-derived topographic model data for sea-level rise prediction in protected salt marsh areas
Dual-frequency GPS survey for validation of a regional DTM and for the generation of local DTM data for sea-level rise modelling in an estuarine salt marsh
- …