1,743,889 research outputs found
Application of dictionary learning to denoise LIGO's blip noise transients
No full textData streams of gravitational-wave detectors are polluted by transient noise features, or “glitches,” of
instrumental and environmental origin. In this work we investigate the use of total variation methods
and learned dictionaries to mitigate the effect of those transients in the data. We focus on a specific type of
transient, “blip" glitches, as this is the most common type of glitch present in the LIGO detectors and their
waveforms are easy to identify. We randomly select 100 blip glitches scattered in the data from advanced
LIGO’s O1 run, as provided by the citizen-science project Gravity Spy. Our results show that dictionarylearning methods are a valid approach to model and subtract most of the glitch contribution in all cases
analyzed, particularly at frequencies below ∼1 kHz. The high-frequency component of the glitch is best
removed when a combination of dictionaries with different atom length is employed. As a further example
we apply our approach to the glitch visible in the LIGO-Livingston data around the time of merger of
binary neutron star signal GW170817, finding satisfactory results. This paper is the first step in our ongoing
program to automatically classify and subtract all families of gravitational-wave glitches employing
variational method
torres-lab/multiComponentBatchWModel: V1.0
No full text<p>Initial release for code used in Torres & Baronas GBC</p>
Total-variation methods for gravitational-wave denoising: Performance tests on Advanced LIGO data
No full textWe assess total-variation methods to denoise gravitational-wave signals in real noise conditions by injecting numerical-relativity waveforms from core-collapse supernovae and binary black hole mergers in data from the first observing run of Advanced LIGO. This work is an extension of our previous investigation in which only Gaussian noise was used. Since the quality of the results depends on the regularization parameter of the model, we perform a heuristic search for the value that produces the best results. We discuss various approaches for the selection of this parameter, based on the optimal, mean, or multiple values, and compare the results of the denoising upon these choices. Moreover, we also present a machine-learning-informed approach to obtain the Lagrange multiplier of the method through an automatic search. Our results provide further evidence that total-variation methods can be useful in the field of gravitational-wave astronomy as a tool to remove noise
Aboriginal and Torres Strait Islander People and dementia: a review of the research
No full textThis report outlines the prevalence of dementia and modifiable risk factors in Aboriginal and Torres Strait Islander communities.
Executive summary
The high rate of dementia in Aboriginal and Torres Strait Islander communities requires urgent attention. Aboriginal and Torres Strait Islander people experience dementia at an earlier age then the general population and this, combined with the steadily growing number of older Aboriginal and Torres Strait Islander people, will result in the number of people effected by dementia growing significantly in the coming years.
Although higher rates of dementia have been reported in Aboriginal and Torres Strait Islander people, the disease is often overlooked by Aboriginal and Torres Strait Islander communities, health workers and service providers. Geographical constraints in the provision of services, a lack of education and awareness in communities and by health workers and the prevalence of other chronic diseases have all posed considerable barriers to the recognition of dementia as an emerging health issue.
This paper includes the following recommendations to ensure that Aboriginal and Torres Strait Islander people, family members and communities have access to awareness, information, and appropriate support services for people with dementia
National Aboriginal and Torres Strait Islander health plan 2013-2023
No full textIn 2008 Australian Governments committed to work with Aboriginal and Torres Strait Islander people on an incredibly important task - to achieve equality in health status and life expectancy between Aboriginal and Torres Strait Islander people and non-Indigenous Australians by the year 2031. The commitment – in the form of the Close the Gap Statement of Intent – creates the platform for this National Aboriginal and Torres Strait Islander Health Plan, which has been developed in partnership with Aboriginal and Torres Strait Islander people and their representatives.
This Health Plan provides a long-term, evidence-based policy framework as part of the overarching Council of Australian Governments’ (COAG) approach to Closing the Gap in Indigenous disadvantage, which has been set out in the National Indigenous Reform Agreement (NIRA) signed in 2008. The NIRA has established a framework of national targets and policy building blocks. Two of the Closing the Gap targets, to halve the gap in child mortality by 2018 and close the life expectancy gap by 2031, go directly to health outcomes, while others address social determinants of health such as education and employment.
The Health Plan builds on the United Nations Declaration on the Rights of Indigenous Peoples. It adopts a strengths-based approach to ensure policies and programs improve health, social and emotional wellbeing, and resilience and promote positive health behaviours. It emphasises the centrality of culture in the health of Aboriginal and Torres Strait Islander people and the rights of individuals to a safe, healthy and empowered life. The Health Plan also builds on existing strategies and planning approaches to improving Aboriginal and Torres Strait Islander health,
Aboriginal and Torres Strait Islander health performance framework 2012 report: Australian Capital Territory
No full textThis report provides the latest information on how Aboriginal and Torres Strait Islander people are faring according to a range of indicators on health status, determinants or health and health system performance.Executive summaryThe Aboriginal and Torres Strait Islander Health Performance Framework 2012 report for the Australian Capital Territory finds areas of improvement in the health of Aboriginal and Torres Strait Islander people living in the territory, including:a significant increase in health assessments for Aboriginal and Torres Strait Islander people aged 55 years and over recorded through Medicare since the introduction of the National Partnership Agreement on Closing the Gap in Indigenous Health Outcomes in July 2009corresponding increases in allied health-care services claimed by Aboriginal and Torres Strait Islander people through Medicare since 1 July 2009. Aboriginal and Torres Strait Islander people have higher rates of general practitioner management plans and team care arrangements than non-Indigenous Australiansimmunisation coverage rates for Aboriginal and Torres Strait Islander children are close to those for other Australian children by age 5some improvements in literacy for Aboriginal and Torres Strait Islander students in Year 3 and 5 between 2009 and 2011apparent retention rates from Year 7 to Year 10 and from Year 11 to Year 12 are higher for Aboriginal and Torres Strait Islander people in the Australian Capital Territory than for Aboriginal and Torres Strait Islander people nationally.Areas of concern include:high rates of smoking during pregnancy (51% total)around half of Aboriginal and Torres Strait Islander people aged 18 and over reported drinking alcohol at short-term risky/high-risk levels in the past 12 months, which was higher than the proportion for non-Indigenous people and for Indigenous people nationallyalmost two-thirds (63%) of Aboriginal and Torres Strait Islander people aged 18 and over in the Australian Capital Territory have a disability or long-term health condition, which is higher than the proportion for Aboriginal and Torres Strait Islander people nationally (41%)breast cancer screening rates for Aboriginal and Torres Strait Islander women are lower than for other women
Joint Select Committee on Constitutional Recognition of Aboriginal and Torres Strait Islander Peoples: final report
No full textOn 28 November 2012, the Parliament agreed that a Joint Select Committee on Constitutional Recognition of Aboriginal and Torres Strait Islander Peoples be appointed to inquire into and report on steps that can be taken to progress towards a successful referendum on Indigenous constitutional recognition.
Chair\u27s foreword
For the last 114 years, Australia\u27s founding document, the Constitution, has been silent on Aboriginal and Torres Strait Islander peoples.
Excluded from voting, and from participating in the convention debates which led to the drafting of the Constitution, the voices of Aboriginal and Torres Strait Islander peoples were silenced by the framers of the Constitution.
While there is no constitutional recognition for Aboriginal and Torres Strait Islander peoples, that silence will continue. The absence of Aboriginal and Torres Strait Islander peoples from the Constitution makes silent and renders invisible the world\u27s oldest continuing culture.
European contact began in the 1600s when ships from Europe first explored the coastlines of the lands and waters that would become known as Australia.
In 1770, Captain James Cook made landfall at Botany Bay. On 26 January 1788, Captain Arthur Phillip established a settlement at Sydney Cove made up of those who travelled as part of the First Fleet.
Over the next century, new colonies were founded and borders were drawn up across a continent that had been home to hundreds of Aboriginal nations for tens of thousands of years.
When the Constitution was drafted, the exclusion of Aboriginal and Torres Strait Islander peoples was unremarkable for the time, as Aboriginal and Torres Strait Islander peoples were not considered citizens and had minimal rights and protections.
However, the continued constitutional silence maintained by this exclusion is remarkable.
That our Constitution allows a state to ban a race from voting is remarkable.
That in our Constitution there are more references to lighthouses than to the first
peoples of this nation is remarkable.
That constitutional recognition has not occurred already is remarkable.
The Joint Select Committee on Constitutional Recognition of Aboriginal and Torres Strait Islander Peoples has engaged the Australian community on constitutional recognition by conducting fifteen public hearings, speaking with constitutional law experts and holding community forums. At all times, the committee has sought to hear the aspirations of Aboriginal and Torres Strait Islander peoples. The committee strongly believes that in order to achieve constitutional recognition, the support of Aboriginal and Torres Strait Islander peoples is of critical importance. Without this support, the imposed silence of the past will continue into the future.
The committee has heard that it is time to remedy the injustice of exclusion and recognise in our founding document the significant contribution of Aboriginal and Torres Strait Islander peoples to a modern Australia.
The committee heard that in order to achieve this, the mere removal of racist sections of the Constitution would not be enough and that much more is needed. The committee heard that Aboriginal and Torres Strait Islander peoples will accept nothing less than a protection from racial discrimination in the Constitution.
Since the time of Captain Cook\u27s first landfall, Aboriginal and Torres Strait Islander peoples have suffered from continuous dislocation, discrimination and disadvantage.
The committee heard of the serious and pressing issues faced by Aboriginal and Torres Strait Islander peoples in everyday life and heard of the endemic racial discrimination faced by Aboriginal and Torres Strait Islander peoples.
The committee acknowledges that recognition in the Constitution will not end racism in Australia, nor will it be a solution to the serious problems faced by Aboriginal and Torres Strait Islander peoples. However, constitutional recognition will be a vital step towards reconciliation and give a voice to Aboriginal and Torres Strait Islander peoples in a Constitution better aligned with a modern Australia.
By protecting Aboriginal and Torres Strait Islander peoples from discrimination on the basis of race, Australia will be better placed to offer its first peoples a future in which their historical mistreatment is not repeated.
This final report of the Joint Select Committee on Constitutional Recognition of Aboriginal and Torres Strait Islander Peoples recommends that a referendum be held on the matter of recognising Aboriginal and Torres Strait Islander peoples in the Constitution.
I commend this report of the Joint Select Committee on Constitutional Recognition of Aboriginal and Torres Strait Islander Peoples to the Prime Minister and the Australian Parliament.
Committee members
Mr Ken Wyatt AM MP, Chair
Senator Nova Peris OAM, Deputy Chair
The Hon Shayne Neumann MP
The Hon Christian Porter MP (until 11 February 2015)
Ms Sarah Henderson MP (from 11 February 2015)
Mr Stephen Jones MP
Senator Bridget McKenzie
Senator James McGrath (from 1 July 2014 – 23 June 2015)
Senator Anne Ruston (until 1 July 2014, from 23 June 2015)
Senator Rachel Siewer
Correspondencia varia Camilo Torres, 1961-1966
No full textCorrespondencia enviada por Camilo Torres Restrepo (1962-1965), comunicación del arzobispo de Bogotá Luis Concha Córdoba sobre reducción de Camilo Torres al estado de laico, comunicación anónima a Guillermo León Valencia sobre muerte de Camilo Torres (1966
Análise de torres de transmissão submetidas a cargas dinâmicas
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Civil.Torres de transmissão de energia são de grande importância para o abastecimento elétrico de um país, pois são elas que suportam os cabos que transmitem a energia. A ruptura ou mesmo a danificação destas estruturas pode ter conseqüências significativas para a economia local. No Brasil o principal carregamento que incide sobre uma linha de transmissão de energia é causado pela ação do vento. A norma brasileira NBR 6123 tem um mapa de isopletas do vento, com a indicação da velocidade média para um período de recorrência de 50 anos a uma altura de 10 metros do solo. Como usualmente o período fundamental da estrutura de torres de transmissão é inferior a 1 s, a maioria das normas permite que seu dimensionamento seja realizado para cargas estáticas equivalentes, obtidas a partir da velocidade média do vento e alguns parâmetros adicionais, função da localização geográfica da torre, sua altura e a área efetiva de incidência do vento. No entanto não são raros os eventos de colapso de torres de transmissão de energia no Brasil, e além disso, a ocorrência de fortes rajadas e ciclones vêm aumentando no país nos últimos anos. Justificase assim a necessidade de uma verificação mais apurada do projeto de torres de transmissão, neste caso sob a ação dinâmica do vento. Escolheu-se para este trabalho uma torre de transmissão típica, situada no sul do Brasil. A estrutura da torre é modelada por elementos de pórtico 3D, sendo consideradas rígidas as ligações das barras principais e rotuladas as ligações de barras secundárias. As análises dinâmicas da ação do vento são realizadas no domínio do tempo, sendo a componente turbulenta do vento obtida a partir dos espectros de Davenport e Kaimal e série de Fourier. Outro caso de carregamento considerado neste tipo de torre é a carga que simula a ruptura de um ou mais cabos de energia, que são fixados à torre para manter suas catenárias com as alturas de segurança nos vãos adjacentes. A ruptura de um cabo em um dos lados da torre pode ser simulada aplicando-se uma força no suporte, no lado contrário. Esta força pode ser aplicada estática ou dinamicamente e pode ser decomposta em duas parcelas: uma devida ao peso do cabo e a outra a tração no cabo, utilizada para o seu correto posicionamento na linha de transmissão. Admite-se nas análises que a torre tem comportamento elástico-linear, e utiliza-se o método da superposição modal para resolver as equações de movimento da estrutura. Conclusões e recomendações são apresentadas no final do trabalho
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