35,004 research outputs found
Testing protoplanetary disc dispersal with radio emission
No full textWe consider continuum free–free radio emission from the upper atmosphere of protoplanetary discs as a probe of the ionized luminosity impinging upon the disc. Making use of previously computed hydrodynamic models of disc photoevaporation within the framework of extreme-ultraviolet (EUV) and X-ray irradiation, we use radiative transfer post-processing techniques to predict the expected free–free emission from protoplanetary discs. In general, the free–free luminosity scales roughly linearly with ionizing luminosity in both EUV- and X-ray-driven scenarios, where the emission dominates over the dust tail of the disc and is partial optically thin at cm wavelengths. We perform a test observation of GM Aur at 14–18?GHz and detect an excess of radio emission above the dust tail to a very high level of confidence. The observed flux density and spectral index are consistent with free–free emission from the ionized disc in either the EUV- or the X-ray-driven scenario. Finally, we suggest a possible route to testing the EUV- and X-ray-driven dispersal model of protoplanetary discs, by combining observed free–free flux densities with measurements of mass-accretion rates. On the point of disc dispersal one would expect to find an M?2? scaling with free–free flux in the case of EUV-driven disc dispersal or an ?* scaling in the case of X-ray-driven disc dispersa
MER-13-0064_E-gels
No full textThis file contains original E-gel images for the manuscript MER-13-0064
1)PVA is labeled as ‘NVI’
2)Fridge storage is labeled as ‘fresh’ in some E-gels
3)E-gels were reused twice
4)Please refer to Table 2 in the manuscript for detailed experiment setup decriptio
Comparative analysis of spatial compression algorithms for k-mer sets
No full textopenUn problema noto nell’ambito della bioinformatica consiste nell’efficiente memorizzazione dei dati ottenuti dalla fase di sequenziamento di un particolare genoma, infatti la lunghezza della sequenza grezza rappresenta un importante ostacolo sia alla memorizzazione che all’elaborazione di essa.
Una prima fase di compressione deriva dall’utilizzo dei noti k-mers ossia sottosequenze di lunghezza k decisa a priori, derivate da una lettura di dimensione maggiore.
L’obiettivo di questa tesi consiste nel presentare e confrontare nuove tecniche utilizzabili per comprimere al meglio codesti k-mer sets, in correlazione all’occupazione spaziale, il costo computazionale di compressione ed il costo computazionale di utilizzo ed analisi del dato compreso in relazione alle finalità su di esso, ricercando l’algoritmo più adatto e analizzando come le prestazioni mutano in funzione della variazione del parametro k all’interno nelle sottosequenze.Here’s the translation of your text:
A well-known problem in bioinformatics is the efficient storage of data obtained from the sequencing phase of a particular genome. In fact, the length of the raw sequence represents a significant obstacle for both storage and processing.
An initial phase of compression comes from the use of the well-known k-mers, which are subsequences of length k, decided beforehand, derived from a larger read.
The aim of this thesis is to present and compare new techniques that can be used to optimally compress these k-mer sets, in relation to spatial occupation, the computational cost of compression, and the computational cost of using and analyzing the compressed data, considering the goals of the analysis. The research seeks to identify the most suitable algorithm and analyze how performance changes as the k parameter varies within the subsequences
Inégalités outre-mer
No full textAujourd'hui, les Outre-mer français ne désignent plus les territoires ayant officiellement fait le choix de rester sous souveraineté française, ordinairement pensés comme opposés aux territoires décolonisés ou, à l'inverse, comme ayant fait le choix démocratique d'une forme originale de décolonisation. Les Outre-mer français ne partagent-ils que cette relation singulière à la métropole qui les constitue en catégorie politique ? Par la richesse des enquêtes de terrain qu'ils restituent et les analyses croisées qu'ils déploient, les textes réunis dans ce dossier montrent qu'en dépit de leur hétérogénéité, leurs situations peuvent être pensées au-delà-voire en dehors-d'une problématique strictement statutaire. La présente introduction aborde cette question par la diversité des processus de (dé)colonisation dans les Outre-mer. Elle interroge les mécanismes par lesquels les dominations historiques enchâssés se maintiennent, se métamorphosent ou s'étiolent
La hausse du niveau de la mer et ses défis
No full textEnglish version here Aris-Georges Marghélis, CDMO, Université de Nantes, France Trente-trois ans après sa conclusion, la Convention des Nations unies sur le droit de la mer (CNUDM) demeure le texte de référence qui régit les rapports des États à la mer et en mer. Inévitablement, le temps interroge certains de ses aspects comme sa cohérence, son adéquation aux nouveaux enjeux - souvent impensables ou non envisagés en 1982 - et l'infaillibilité de certains de ses principes. Parmi ces nouveaux e..
Milieueffectrapportage Zandmotor Delflandse kust (projectnota/MER)
No full textMilieueffectrapportage met bijlagen (morfologische berekeningen, slib, natuur, zandwinning, aanleg, luchtkwaliteit, geluid) alsmede de startnotitie.Zandmoto
Worst Case Scenario and Stakeholder Group Decision: A 5-6 Meter Sea Level Rise in the Rhone Delta, France
No full textRisk policy and public attitudes appear disconnected from research predicting warmer climate partially due to human activity. To step out of this stalled situation, a worst case scenario of a 5-6m sea level rise (SLR) induced by the collapse of the WAIS and occurring during the period 2030-2130 is constructed and applied to the Rhone delta. Physical and socio-economic scenarios developed with data from the Rhone delta context are developed and submitted to stakeholders for a day-long workshop. Group process analysis shows a high level of trust and cooperation mobilized to face the 5-6m SLR issue, despite potentially diverging interests. Two sets of recommendations stem from the scenario workshop. A conservative "wait and see" option is decided when the risk of the WAIS collapse is announced in 2030. After WAIS collapse generates an effective 1m SLR rise by 2050, decisions are taken for total retreat and rendering of the Rhone delta to its hydrological function. The transposition of these results into present times policy decisions could be considered. The methodology developed here could be applied to other risk objects and situations, and serve for policy exercises and crisis prevention.Sea level rise, France, Camargue, scenario, extreme climate, stakeholder workshop
Improving Spaced k-mer Extraction and Hash Encoding for Bioinformatics Applications
No full textopenQuesta tesi si concentra sul miglioramento dell'estrazione e della codifica hash di k-mers spaziati per applicazioni bioinformatiche. Esplora il concetto di semi spaziati, che migliorano il rilevamento della somiglianza consentendo corrispondenze non consecutive all'interno dei k-mers, anche se a spese di una maggiore complessità computazionale.
Lo scopo principale di questa ricerca è sviluppare un software avanzato in grado di eseguire rapidamente l'hashing e l'hashing del complemento inverso per i k-mer spaziati nelle sequenze nucleotidiche. Ciò include l'ottimizzazione del processo di hashing per gestire meglio grandi insiemi di dati genomici e minimizzare il tempo di elaborazione e le risorse computazionali. Il lavoro include l'introduzione dello strumento DuoHash, una versione migliorata di Multiple Iterative Spaced Seed Hashing (MISSH) e ne confrontiamo le prestazioni con ntHash2. I risultati dimostrano come DuoHash si comporta su diversi set di dati, mostrando la sua efficienza in termini di tempo e l'integrabilità con strumenti come JellyFish. Infine, vengono discusse le implicazioni pratiche e i suggerimenti per le future direzioni di ricerca.This thesis focuses on improving the extraction and hash encoding of spaced k-mers for bioinformatics applications. It explores the concept of spaced seeds, which improve similarity detection by allowing nonconsecutive matches within k-mers, albeit at the expense of increased computational complexity.
The main goal of this research is to develop advanced software capable of rapid forward and reverse complement hashing for spaced k-mer in nucleotide sequences. This includes optimizing the hashing process to better handle large genomic datasets and minimize processing time and computational resources. The work includes the introduction of the DuoHash tool, an improved version of Multiple Iterative Spaced Seed Hashing (MISSH), and we compare its performance with ntHash2. Results demonstrate how DuoHash performs on different datasets, showing its time efficiency and integrability with tools such as JellyFish. Finally, practical implications and suggestions for future research directions are discussed
Blind Per-Survivor Processing-Based Multiuser Detection for Channel-Coded Multi-Carrier DS-CDMA Systems
No full textIn this paper, we present a blind Per-Survivor Processing (PSP)-hased Multiuser Detector (MUD) for synchronous Multicarrier (MC) Direct Sequence (DS) CDMA systems. We modify the branch metric conventionally used for the Single-Carrier (SC) PSP-based MUD in order to detect synchronous MC DS-CDMA signals. Subsequently we characterise the performance of rate R = ½ Low Density Parity Check (LDPC)-coded, Convolutional-based Turbo (CT)-coded and convolutional-coded (CC) MC DS-CDMA systems, which employ four subcarriers. We assume that each subcarrier experienced uncorrelated. narrowband Rayleigh fading and quantified the BER performance, computational complexity and system delay. It is observed that when interleaving is performed over a single transmission burst, it is sufficient to utilise low-complexity CC codes. When the MC DS-CDMA system was not constrained by the tolerable system delay and hence interleaving was performed over several transmission bursts, CT codes yielded the best performance. LDPC codes were also capable of approaching the performance attained by the CT codes, although at a factor of 2.4 higher computational complexity
Preservação dos recursos marinhos à luz da Convenção das Nações Unidas sobre o direito do mar e da legislação de Cabo Verde
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Jurídicas. Programa de Pós-Graduação em Direito.O presente trabalho que versa sobre a Preservação dos recursos marinhos à luz da Convenção das Nações Unidas sobre o Direito do Mar de 1982 e da legislação de Cabo Verde de 1975 a 2002, enquadra-se na linha de pesquisa das relações internacionais do Centro de Ciências Jurídicas da Universidade Federal de Santa Catarina. Inicialmente, foi traçada a evolução histórica do Direito do Mar desde a Antigüidade, passando pelas Convenções de Genebra até a Convenção das Nações Unidas sobre o Direito do Mar, de 1982. Posteriormente, foram analisados os fundamentos e os princípios do Direito do Mar com referências às zonas contígua, a zona econômica exclusiva, à plataforma continental, ilhas, arquipélagos, bem como aos espaços, não submetidos à jurisdição nacional como o alto mar e os fundos marinhos, onde se inclui a noção de patrimônio comum da humanidade, à luz da disciplina estabelecida na Convenção e à luz dos critérios aduzidos pela Corte Internacional de Justiça e tribunais internacionais na solução de litígios. Em seguida, foi objeto de exame a preservação dos recursos marinhos à luz da Convenção de Montego Bay, com especial atenção para a pesca, a conservação dos recursos vivos e a proteção ambiental do mar com base no capítulo XII da Convenção. Finalmente, analisou-se a preservação dos recursos marinhos à luz da legislação cabo-verdiana, privilegiando-se os recursos haliêuticos e a poluição marinha. Enfatizou-se a necessidade do implemento da legislação e o reforço do compromisso em legar um mundo melhor às gerações vindouras
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