1,720,963 research outputs found
OccRF-Health study: occupational exposure of workers to RF-EMF
Get PDFRadiofrequency electromagnetic fields (RF-EMF) exposure,
ubiquitous in our environment due to the rise in mobile phones and
wireless technology, has grown significantly in the last 30 years. This
exposure is generally low in everyday environments, but certain
occupations, like those in the medical sector or telecommunications,
involve high-intensity RF-EMF exposure scenarios. Although
studies on RF-EMF's health effects, particularly its link to brain
tumors, are inconclusive, the International Agency of Research on
Cancer (IARC) classifies it as possibly carcinogenic (Group 2B). The
current limitations in exposure assessment might contribute to these
inconclusive findings. This thesis aims to i) perform full-shift
personal RF-EMF measurements in various occupations, ii) compare
measurements performed to the exposure estimates in the previously
developed INTEROCC RF-JEM iii) explore the link between
occupational RF-EMF exposure and brain tumors in the INTEROCC
study using the RF-JEM.
Personal RF-EMF measurements were carried out on 333 workers
across 46 ISCO88 occupations using body-worn exposimeters. These
measurements revealed that exposures exceeding 1% of the
International Commission on Non-Ionizing Radiation Protection
(ICNIRP) 1998 occupational standards were uncommon and
typically of short duration, with exposure levels surpassing ICNIRP
standards being confined to specific occupations and generally
lasting only a few seconds. This data was used to conduct a
comparison of estimated exposure profiles with the INTEROCC RF-
JEM. Results showed poor agreement overall, likely due to the
different exposure assessment methods used to create the exposure
estimates. In the context of the INTEROCC case-control study, the
use of the RF-JEM did not find clear positive associations overall
across the range of exposure metrics and time periods evaluated.
Only marginally increased Odds Ratios (ORs) for gliomas in both
electric (E) and magnetic (H) fields, particularly in the 1 to 4 years
exposure period prior to diagnosis were found.
The findings of this thesis suggest that accurately depicting personal
occupational exposure to RF-EMF in various occupations is complex
and challenging, and still limited by several factors. Further personal
measurements of occupational RF-EMF exposure are necessary,
particularly in highly-exposed occupations. This would enhance our
understanding of the reliability of these exposure assessments and
their implications for epidemiological findings related to brain tumor
risks.La exposición a los campos electromagnéticos de radiofrecuencia
(RF-EMF), ubicua en nuestro entorno debido al aumento de los
teléfonos móviles y la tecnología inalámbrica, ha crecido
significativamente en los últimos 30 años. Esta exposición es
generalmente baja en entornos cotidianos, pero ciertas ocupaciones,
como las del sector médico o las telecomunicaciones, implican
escenarios de exposición a RF-EMF de alta intensidad. Aunque los
estudios sobre los efectos en la salud de los RF-EMF, particularmente
su vínculo con los tumores cerebrales, son inconclusos, la Agencia
Internacional de Investigación sobre el Cáncer (IARC) lo clasifica
como posiblemente carcinogénico (Grupo 2B). Las limitaciones
actuales en la evaluación de la exposición podrían contribuir a estos
hallazgos inconclusos. Esta tesis tiene como objetivo i) realizar
mediciones personales de RF-EMF durante toda la jornada laboral en
varias ocupaciones, ii) comparar las mediciones realizadas con las
estimaciones de exposición en el INTEROCC RF-JEM previamente
desarrollado, iii) explorar el vínculo entre la exposición ocupacional
a RF-EMF y los tumores cerebrales en el estudio INTEROCC
utilizando el RF-JEM.
Las mediciones personales de RF-EMF se llevaron a cabo en 333
trabajadores en 46 ocupaciones ISCO88 usando exposímetros
portátiles. Estas mediciones revelaron que las exposiciones que
superan el 1% de los estándares ocupacionales de la Comisión
Internacional de Protección contra la Radiación No Ionizante
(ICNIRP) de 1998 eran poco comunes y típicamente de corta
duración, con niveles de exposición que superaban los estándares de
la ICNIRP limitados a ocupaciones específicas y que generalmente
duraban solo unos segundos. Estos datos se utilizaron para realizar
una comparación de los perfiles de exposición estimados con el
INTEROCC RF-JEM. Los resultados mostraron un acuerdo
generalmente pobre, probablemente debido a los diferentes métodos
de evaluación de la exposición utilizados para crear las estimaciones
de exposición. En el contexto del estudio de caso-control
INTEROCC, el uso del RF-JEM no encontró asociaciones positivas
claras en general en toda la gama de métricas de exposición y
períodos de tiempo evaluados. Solo se encontraron Odds Ratios (OR)
marginalmente aumentados para gliomas en campos eléctricos (E) y
magnéticos (H), particularmente en el período de exposición de 1 a 4
años antes del diagnóstico.
Los hallazgos de esta tesis sugieren que representar con precisión la
exposición ocupacional personal a RF-EMF en varias ocupaciones es
complejo y desafiante, y todavía está limitado por varios factores. Se
necesitan más mediciones personales de la exposición ocupacional a
RF-EMF, particularmente en ocupaciones altamente expuestas. Esto
mejoraría nuestra comprensión de la fiabilidad de estas evaluaciones
de exposición y sus implicaciones para los hallazgos epidemiológicos
relacionados con los riesgos de tumores cerebrales.Programa de Doctorat en Biomedicin
OccRF-Health study: occupational exposure of workers to RF-EMF
No full textRadiofrequency electromagnetic fields (RF-EMF) exposure, ubiquitous in our environment due to the rise in mobile phones and wireless technology, has grown significantly in the last 30 years. This exposure is generally low in everyday environments, but certain occupations, like those in the medical sector or telecommunications, involve high-intensity RF-EMF exposure scenarios. Although studies on RF-EMF's health effects, particularly its link to brain tumors, are inconclusive, the International Agency of Research on Cancer (IARC) classifies it as possibly carcinogenic (Group 2B). The current limitations in exposure assessment might contribute to these inconclusive findings. This thesis aims to i) perform full-shift personal RF-EMF measurements in various occupations, ii) compare measurements performed to the exposure estimates in the previously developed INTEROCC RF-JEM iii) explore the link between occupational RF-EMF exposure and brain tumors in the INTEROCC study using the RF-JEM. Personal RF-EMF measurements were carried out on 333 workers across 46 ISCO88 occupations using body-worn exposimeters. These measurements revealed that exposures exceeding 1% of the International Commission on Non-Ionizing Radiation Protection (ICNIRP) 1998 occupational standards were uncommon and typically of short duration, with exposure levels surpassing ICNIRP standards being confined to specific occupations and generally lasting only a few seconds. This data was used to conduct a comparison of estimated exposure profiles with the INTEROCC RF- JEM. Results showed poor agreement overall, likely due to the different exposure assessment methods used to create the exposure estimates. In the context of the INTEROCC case-control study, the use of the RF-JEM did not find clear positive associations overall across the range of exposure metrics and time periods evaluated. Only marginally increased Odds Ratios (ORs) for gliomas in both electric (E) and magnetic (H) fields, particularly in the 1 to 4 years exposure period prior to diagnosis were found. The findings of this thesis suggest that accurately depicting personal occupational exposure to RF-EMF in various occupations is complex and challenging, and still limited by several factors. Further personal measurements of occupational RF-EMF exposure are necessary, particularly in highly-exposed occupations. This would enhance our understanding of the reliability of these exposure assessments and their implications for epidemiological findings related to brain tumor risks.La exposición a los campos electromagnéticos de radiofrecuencia (RF-EMF), ubicua en nuestro entorno debido al aumento de los teléfonos móviles y la tecnología inalámbrica, ha crecido significativamente en los últimos 30 años. Esta exposición es generalmente baja en entornos cotidianos, pero ciertas ocupaciones, como las del sector médico o las telecomunicaciones, implican escenarios de exposición a RF-EMF de alta intensidad. Aunque los estudios sobre los efectos en la salud de los RF-EMF, particularmente su vínculo con los tumores cerebrales, son inconclusos, la Agencia Internacional de Investigación sobre el Cáncer (IARC) lo clasifica como posiblemente carcinogénico (Grupo 2B). Las limitaciones actuales en la evaluación de la exposición podrían contribuir a estos hallazgos inconclusos. Esta tesis tiene como objetivo i) realizar mediciones personales de RF-EMF durante toda la jornada laboral en varias ocupaciones, ii) comparar las mediciones realizadas con las estimaciones de exposición en el INTEROCC RF-JEM previamente desarrollado, iii) explorar el vínculo entre la exposición ocupacional a RF-EMF y los tumores cerebrales en el estudio INTEROCC utilizando el RF-JEM. Las mediciones personales de RF-EMF se llevaron a cabo en 333 trabajadores en 46 ocupaciones ISCO88 usando exposímetros portátiles. Estas mediciones revelaron que las exposiciones que superan el 1% de los estándares ocupacionales de la Comisión Internacional de Protección contra la Radiación No Ionizante (ICNIRP) de 1998 eran poco comunes y típicamente de corta duración, con niveles de exposición que superaban los estándares de la ICNIRP limitados a ocupaciones específicas y que generalmente duraban solo unos segundos. Estos datos se utilizaron para realizar una comparación de los perfiles de exposición estimados con el INTEROCC RF-JEM. Los resultados mostraron un acuerdo generalmente pobre, probablemente debido a los diferentes métodos de evaluación de la exposición utilizados para crear las estimaciones de exposición. En el contexto del estudio de caso-control INTEROCC, el uso del RF-JEM no encontró asociaciones positivas claras en general en toda la gama de métricas de exposición y períodos de tiempo evaluados. Solo se encontraron Odds Ratios (OR) marginalmente aumentados para gliomas en campos eléctricos (E) y magnéticos (H), particularmente en el período de exposición de 1 a 4 años antes del diagnóstico. Los hallazgos de esta tesis sugieren que representar con precisión la exposición ocupacional personal a RF-EMF en varias ocupaciones es complejo y desafiante, y todavía está limitado por varios factores. Se necesitan más mediciones personales de la exposición ocupacional a RF-EMF, particularmente en ocupaciones altamente expuestas. Esto mejoraría nuestra comprensión de la fiabilidad de estas evaluaciones de exposición y sus implicaciones para los hallazgos epidemiológicos relacionados con los riesgos de tumores cerebrales.Programa de Doctorat en Biomedicin
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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