Citizen noise pollution monitoring

Trabajo presentado a la 10th Annual International Conference on Digital Government Research: Social Networks: Making Connections between Citizens, Data and Government, celebrada en Puebla (México) del 17 al 21 de mayo de 2009.In this paper we present a new approach to monitor noise pollution involving citizens and built upon the notions of participatory sensing and citizen science. We enable citizens to measure their personal exposure to noise in their everyday environment by using GPS-equipped mobile phones as noise sensors. The geo-localised measures and user-generated meta-data can be automatically sent and shared online with the public to contribute to the collective noise mapping of cities. Our prototype, called NoiseTube, can be found online.This work was partially supported by the EU under contract IST- 34721 (TAGora). The TAGora project is funded by the Future and Emerging Technologies program (IST-FET) of the European Commission. Matthias Stevens is a Research Assistant of the Fund for Scientific Research, Flanders (Aspirant van het Fonds Wetenschappelijk Onderzoek - Vlaanderen).Peer reviewe

Modus Operandi of Crowd Workers : The Invisible Role of Microtask Work Environments

The ubiquity of the Internet and the widespread proliferation of electronic devices has resulted in flourishing microtask crowdsourcing marketplaces, such as Amazon MTurk. An aspect that has remained largely invisible in microtask crowdsourcing is that of work environments; defined as the hardware and software affordances at the disposal of crowd workers which are used to complete microtasks on crowdsourcing platforms. In this paper, we reveal the significant role of work environments in the shaping of crowd work. First, through a pilot study surveying the good and bad experiences workers had with UI elements in crowd work, we revealed the typical issues workers face. Based on these findings, we then deployed over 100 distinct microtasks on CrowdFlower, addressing workers in India and USA in two identical batches. These tasks emulate the good and bad UI element designs that characterize crowdsourcing microtasks. We recorded hardware specifics such as CPU speed and device type, apart from software specifics including the browsers used to complete tasks, operating systems on the device, and other properties that define the work environments of crowd workers. Our findings indicate that crowd workers are embedded in a variety of work environments which influence the quality of work produced. To confirm and validate our data-driven findings we then carried out semi-structured interviews with a sample of Indian and American crowd workers from this platform. Depending on the design of UI elements in microtasks, we found that some work environments are more suitable than others to support crowd workers. Based on our overall findings resulting from all the three studies, we introduce ModOp, a tool that helps to design crowdsourcing microtasks that are suitable for diverse crowd work environments. We empirically show that the use of ModOp results in reducing the cognitive load of workers, thereby improving their user experience without effecting the accuracy or task completion time

Community-based Data Validation Practices in Citizen Science

Technology-supported citizen science has created huge volumes of data with increasing potential to facilitate scientific progress, however, verifying data quality is still a substantial hurdle due to the limitations of existing data quality mechanisms. In this study, we adopted a mixed methods approach to investigate community-based data validation practices and the characteristics of records of wildlife species observations that affected the outcomes of collaborative data quality management in an online community where people record what they see in the nature. The findings describe the processes that both relied upon and added to information provenance through information stewardship behaviors, which led to improved reliability and informativity. The likelihood of community-based validation interactions were predicted by several factors, including the types of organisms observed and whether the data were submitted from a mobile device. We conclude with implications for technology design, citizen science practices, and research.NSF CCF 144266

Effectiveness of Personal Protective Equipment for Healthcare Workers Caring for Patients with Filovirus Disease: A Rapid Review

BACKGROUND: A rapid review, guided by a protocol, was conducted to inform development of the World Health Organization’s guideline on personal protective equipment in the context of the ongoing (2013-present) Western African filovirus disease outbreak, with a focus on health care workers directly caring for patients with Ebola or Marburg virus diseases. METHODS: Electronic databases and grey literature sources were searched. Eligibility criteria initially included comparative studies on Ebola and Marburg virus diseases reported in English or French, but criteria were expanded to studies on other viral hemorrhagic fevers and non-comparative designs due to the paucity of studies. After title and abstract screening (two people to exclude), full-text reports of potentially relevant articles were assessed in duplicate. Fifty-seven percent of extraction information was verified. The Grading of Recommendations Assessment, Development and Evaluation framework was used to inform the quality of evidence assessments. RESULTS: Thirty non-comparative studies (8 related to Ebola virus disease) were located, and 27 provided data on viral transmission. Reporting of personal protective equipment components and infection prevention and control protocols was generally poor. CONCLUSIONS: Insufficient evidence exists to draw conclusions regarding the comparative effectiveness of various types of personal protective equipment. Additional research is urgently needed to determine optimal PPE for health care workers caring for patients with filovirus

Electrophilic bromination in flow : a safe and sustainable alternative to the use of molecular bromine in batch

Bromination reactions are crucial in today’s chemical industry since the versatility of the formed organobromides makes them suitable building blocks for numerous syntheses. However, the use of the toxic and highly reactive molecular bromine (Br2) makes these brominations very challenging and hazardous. We describe here a safe and straightforward protocol for bromination in continuous flow. The hazardous Br2 or KOBr is generated in situ by reacting an oxidant (NaOCl) with HBr or KBr, respectively, which is directly coupled to the bromination reaction and a quench of residual bromine. This protocol was demonstrated by polybrominating both alkenes and aromatic substrates in a wide variety of solvents, with yields ranging from 78% to 99%. The protocol can easily be adapted for the bromination of other substrates in an academic and industrial environment

The first GeV flare of the radio-loud narrow-line Seyfert 1 galaxy PKS 2004-447

On 2019 October 25, the Fermi-Large Area Telescope observed the first gamma-ray flare from the radio-loud narrow-line Seyfert 1 (NLSy 1) galaxy PKS 2004$-$447 ($z=0.24$). We report on follow-up observations in the radio, optical-UV, and X-ray bands that were performed by ATCA, the Neil Gehrels Swift observatory, XMM-Newton, and NuSTAR, respectively, and our multi-wavelength analysis. We study the variability across all energy bands and additionally produce $\gamma$-ray light curves with different time binnings to study the variability on short timescales during the flare. We examine the X-ray spectrum from 0.5$-$50 keV by describing the spectral shape with an absorbed power law. We analyse multi-wavelength datasets before, during, and after the flare and compare these with a low activity state of the source by modelling the respective SEDs with a one-zone synchrotron inverse Compton radiative model. Finally, we compare our results to gamma-ray flares previously observed from other $\gamma$-loud NLSy 1 galaxies. At gamma-ray energies (0.1$-$300 GeV) the flare reached a total maximum flux of $(2.7\pm0.6)\times10^{-6}$~ph~cm$^{-2}$~s$^{-1}$ in 3-hour binning. With a photon index of $\Gamma_{0.1-300\mathrm{GeV}}=2.42\pm0.09$ during the flare, this corresponds to an isotropic gamma-ray luminosity of $(2.9\pm0.8)\times10^{47}\,\mathrm{erg}\,\mathrm{s}^{-1}$. The $\gamma$-ray, X-ray, and optical-UV light curves covering the end of September to the middle of November show significant variability, and we find indications for flux-doubling times of $\sim 2.2$~hours at $\gamma$-ray energies. During the flare, the SED exhibits large Compton dominance. While the increase in the optical-UV range can be explained by enhanced synchrotron emission, the elevated $\gamma$-ray flux can be accounted for by an increase in the bulk Lorentz factor of the jet, similarly observed for flaring gamma-ray blazars.Comment: 17 pages, 7 figures. Accepted for publication in Astronomy & Astrophysic

Strong light scattering and broadband (UV to IR) photoabsorption in stretchable 3D hybrid architectures based on Aerographite decorated by ZnO nanocrystallites

In present work, the nano- and microscale tetrapods from zinc oxide were integrated on the surface of Aerographite material (as backbone) in carbon-metal oxide hybrid hierarchical network via a simple and single step magnetron sputtering process. The fabricated hybrid networks are characterized for morphology, microstructural and optical properties. The cathodoluminescence investigations revealed interesting luminescence features related to carbon impurities and inherent host defects in zinc oxide. Because of the wide bandgap of zinc oxide and its intrinsic defects, the hybrid network absorbs light in the UV and visible regions, however, this broadband photoabsorption behavior extends to the infrared (IR) region due to the dependence of the optical properties of ZnO architectures upon size and shape of constituent nanostructures and their doping by carbon impurities. Such a phenomenon of broadband photoabsorption ranging from UV to IR for zinc oxide based hybrid materials is novel. Additionally, the fabricated network exhibits strong visible light scattering behavior. The developed Aerographite/nanocrystalline ZnO hybrid network materials, equipped with broadband photoabsorption and strong light scattering, are very promising candidates for optoelectronic technologies

CIÊNCIA CIDADÃ EXTREMA: UMA NOVA ABORDAGEM

A conservação da biodiversidade é uma questão que tem preocupado o mundo todo. Nas últimas décadas, centenas de áreas protegidas foram criadas para assegurar a preservação da biodiversidade no planeta. Um grande número de áreas protegidas é habitado por comunidades que dependem do uso de seus recursos naturais não apenas para a sua sobrevivência, mas também para a sua reprodução social e cultural. Em muitos casos, as populações locais têm sido diretamente responsáveis pela gestão sustentável desses complexos ecossistemas por séculos. Iniciativas de Ciência Cidadã – entendida como a participação de amadores, voluntários e entusiastas em projetos científicos – têm envolvido o público na produção científica e em projetos de monitoramento da biodiversidade, mas têm limitado essa participação à coleta de dados, e têm normalmente ocorrido em locais afluentes, excluindo as populações não alfabetizadas ou letradas e que vivem em áreas remotas. Povos e comunidades tradicionais conhecem os aspectos ambientais das áreas por eles habitadas, o que pode ser benéfico para a gestão e o monitoramento bem-sucedidos da biodiversidade. Portanto, ao se tratar do monitoramento e da proteção da biodiversidade em áreas habitadas por populações humanas, o seu envolvimento é central e pode conduzir a um cenário onde todas as partes envolvidas se beneficiam. Extreme Citizen Science (ExCiteS) é um grupo de pesquisa interdisciplinar criado em 2011, na University College London, com a finalidade de avançar o atual conjunto de práticas da Ciência Cidadã. A ideia é permitir que qualquer comunidade, em qualquer lugar do mundo – desde grupos marginalizados que vivem nas periferias de áreas urbanas até grupos de caçadores e coletores da floresta amazônica –, comece um projeto de Ciência Cidadã para lidar com suas próprias questões. Este artigo apresenta os diversos aspectos que tornam a Ciência Cidadã “extrema” no trabalho do grupo ExCiteS, por meio da exposição de suas teorias, métodos e ferramentas, e dos estudos de caso atuais que envolvem comunidades tradicionais ao redor do mundo. Por fim, ressalta-se a maior preocupação do grupo, que é tornar a participação verdadeiramente efetiva, e sugere-se como iniciativas de monitoramento da biodiversidade podem ser realizadas de maneira colaborativa, trazendo benefícios a todos os atores envolvidos