Measuring surface moisture on a sandy beach based on corrected intensity data of a mobile terrestrial LiDAR

Surface moisture plays a key role in limiting the aeolian transport on sandy beaches. However, the existing measurement techniques cannot adequately characterize the spatial and temporal distribution of the beach surface moisture. In this study, a mobile terrestrial LiDAR (MTL) is demonstrated as a promising method to detect the beach surface moisture using a phase-based Z&F/Leica HDS6100 laser scanner mounted on an all-terrain vehicle. Firstly, two sets of indoor calibration experiments were conducted so as to comprehensively investigate the effect of distance, incidence angle and sand moisture contents on the backscattered intensity by means of sand samples with an average grain diameter of 0.12 mm. A moisture estimation model was developed which eliminated the effects of the incidence angle and distance (it only relates to the target surface reflectance). The experimental results reveal both the distance and incidence angle influencing the backscattered intensity of the sand samples. The standard error of the moisture model amounts to 2.0% moisture, which is considerably lower than the results of the photographic method. Moreover, a field measurement was conducted using the MTL system on a sandy beach in Belgium. The accuracy and robustness of the beach surface moisture derived from the MTL data was evaluated. The results show that the MTL is a highly suitable technique to accurately and robustly measure the surface moisture variations on a sandy beach with an ultra-high spatial resolution (centimeter-level) in a short time span (12 x 200 m per minute)

Impact of AVHRR channel 3b noise on climate data records: filtering method applied to the CM SAF CLARA-A2 data record

A method for reducing the impact of noise in the 3.7 micron spectral channel in climate data records derived from coarse resolution (4 km) global measurements from the Advanced Very High Resolution Radiometer (AVHRR) data is presented. A dynamic size-varying median filter is applied to measurements guided by measured noise levels and scene temperatures for individual AVHRR sensors on historic National Oceanic and Atmospheric Administration (NOAA) polar orbiting satellites in the period 1982–2001. The method was used in the preparation of the CM SAF cLoud, Albedo and surface RAdiation dataset from AVHRR data—Second Edition (CLARA-A2), a cloud climate data record produced by the EUMETSAT Satellite Application Facility for Climate Monitoring (CM SAF), as well as in the preparation of the corresponding AVHRR-based datasets produced by the European Space Agency (ESA) Climate Change Initiative (CCI) project ESA-CLOUD-CCI. The impact of the noise filter was equivalent to removing an artificial decreasing trend in global cloud cover of 1–2% per decade in the studied period, mainly explained by the very high noise levels experienced in data from the first satellites in the series (NOAA-7 and NOAA-9). View Full-Tex

Rhetoric and gender in Sidney's 'Arcadias'

This thesis starts from the point of departure that Sidney's claim in his Defence of Poetry that the purpose of literature is to delight and instruct a given audience is both an accurate and important guiding principle behind the creation of his two Arcadias. By their author's criteria, Sidney's works seek not only to provide diverting images of a fictive world, but to insure that these images serve some specific moral, didactic purpose. The manner in which Sidney goes about achieving this end is, however, less simplistic than the ordinary understanding of didactic literature connotes. The most historically determined aspect of the Arcadia 's didacticism is its extensive and strategic deployment of rhetorical figuration. Rhetoric in Sidney's Renaissance England represented both a vital tool in the smooth running of political life and a signpost of literary genius. The Arcadia thus manipulates specific rhetorical figures and tropes both to demonstrate the great literary skill of its author as well as to depict an ethical and political ideal. Part One of the thesis first investigates the history of rhetorical theory and its impact on the reputation of Sidney's work. It then goes on to explore particular rhetorical devices employed most frequently and significantly in the Old and New Arcadias, drawing comparisons between the versions as to underscore the differences in stylistic procedure and dramatic content of each work. Other aspects of Sidney's rhetoricism, such as his treatment of paradox and his rhetorical character portrayal, are also studied in an effort to gauge the major differences between the Old and New Arcadias. The overall conclusions drawn indicate that Sidney adapts his rhetorical strategy to accommodate a more complex and mature vision of ethical behaviour in his revised work. The other key aspect of Sidney's didacticism is his self-conscious and contentious depiction of gender roles. That is, Sidney plays off varying aspects of traditionally gender-associated behaviour to portray his own vision of an heroic ethical ideal. For example, the Amazon and the transvestite become vehicles through which to explore aspects of femininity that are for Sidney wholly in concord with manifestations of heroism. Moreover, Sidney subverts traditional gendered conceptions of particular vices and virtues to illustrate a liberal attitude toward the potentialities of women and men. Part Two, then, is dedicated to drawing out Sidney's understanding of gender roles as they reflect and demonstrate his unique vision of an heroic ideal. The observations made about the rhetorical and gendered dimensions of Sidney's didacticism are brought together in the conclusion, where Sidney's rhetoric is situated within the context of gender. In other words, the gendered conception of Sidney's particular brand of rhetoric is brought to the fore and poised within the ethical framework it embodies

Exemplary Influences and Augustus' pernicious moral legacy

This is a final draft of the book chapter. The final version will appear in the Oxford book in 2014. OUP has kindly given permission for us to pre-publish the chapter on this site.No abstract available

Properties of the Higgs-like state around 125 GeV in its decay into two photons at the CMS experiment

Results are presented of a search for the Standard Model (SM) Higgs boson decaying into two photons at the Compact Muon Solenoid (CMS) experiment housed at the Large Hadron Collider (LHC), CERN. An excess of events is observed over the background expectation with a local significance of 5.7 (lower-case sigma), where the SM expectation is 5.2 (lower-case sigma), constituting a standalone discovery of the particle first observed by the ATLAS and CMS experiments in July 2012. Measurements of the particle's signal strength, mass and couplings are presented along with an analysis of its spin. The results show a high level of compatibility with the predictions for a SM Higgs boson. The observed state's signal strength relative to the SM expectation is found to be lower-case sigma/lower-case sigma_{\mathrm{SM}}=1.14^{+0.26}_{-0.23}$. The observed state's mass is found to be$124.72\pm 0.35$~GeV. The signal strength relative to the SM expectation when probing production mechanisms through fermionic modes only is 1.13^{+0.37}_{-0.31}, and from bosonic production modes only is 1.16^{+0.63}_{-0.57}. A spin-2 graviton, produced entirely by gluon fusion, is excluded at 94\%~C.L.~(92\% expected) and a spin-2 graviton, produced entirely by quark-antiquark annihilation, is excluded at 85\%~C.L.~(83\% expected).Open Acces

Bioinformatics approaches for hybrid de novo genome assembly

De novo genome assembly, the computational process to reconstruct the genomic sequence from scratch stitching together overlapping reads, plays a key role in computational biology and, to date, it cannot be considered a solved problem. Many bioinformatics approaches are available to deal with different type of data generated by diverse technologies. Assemblies relying on short read data resulted to be highly fragmented, reconstructing short contigs interrupted in repetitive region; on the other side long-read based approaches still suffer of high sequencing error rate, worsening the final consensus quality. This thesis aimed to assess the impact of different assembly approaches on the reconstruction of a highly repetitive genome, identifying the strengths and limiting the weaknesses of such approaches through the integration of orthogonal data types. Moreover, a benchmarking study has been undertaken to improve the contiguity of this genome, describing the improvements obtained thanks to the integration of additional data layers. Assemblies performed using short reads confirmed the limitation in the reconstruction of long sequences for both the software adopted. The use of long reads allowed to improve the genome assembly contiguity, reconstructing also a greater number of gene models. Despite the enhancement of contiguity, base level accuracy of long reads-based assembly could still not reach higher levels. Therefore, short reads were integrated within the assembly process to limit the base level errors present in the reconstructed sequences up to 96%. To order and orient the assembled polished contigs into longer scaffolds, data derived from three different technologies (linked read, chromosome conformation capture and optical mapping) have been analysed. The best contiguity metrics were obtained using chromosome conformation data, which permit to obtain chromosome-scale scaffolds. To evaluate the obtained results, data derived from linked reads and optical mapping have been used to identify putative misassemblies in the scaffolds. Both the datasets allowed the identification of misassemblies, highlighting the importance of integrating data derived from orthogonal technologies in the de novo assembly process. 4 This work underlines the importance of adopting bioinformatics approaches able to deal with data type generated by different technologies. In this way, results could be more accurately validated for the reconstruction of assemblies that could be eventually considered reference genomes