527 resultados para Investigator


Relevância:

10.00% 10.00%

Publicador:

Resumo:

El ruido es un contaminante que cada vez va tomando más importancia por ser un tipo de contaminación propio de las sociedades modernas. Su estudio en tanto su origen y efectos en la población, ha sido objeto de numerosas líneas de investigación en el mundo, siendo una de las herramientas más utilizadas las encuestas de percepción de molestias realizadas en numerosos países y de variados diseños metodológicos. Sin embargo, la profusa información recolectada por muchos años y por distintos países por medio de estas herramientas no permite obtener datos relacionados entre ellos para estudiar las distintas condiciones de exposición a distintos tipos de fuentes de ruido, dado que responden a diseños de instrumentos de recolección de datos (encuestas) distintos y, aún más, a escalas de mediciones distintas. Un esfuerzo por generar datos y estudios que puedan ser relacionados para contribuir a mayor conocimiento del ruido y sus efectos en la salud de la población, es la iniciativa desarrollada por el ICBEN (International Commission of Biological Effects on Noise) que desde el año 1997 un grupo de investigadores se ha propuesto generar estudios e investigaciones bajo una metodología que permita comparar los diferentes estudios que se realicen y que sus conclusiones permitan ser utilizadas por el resto y así generar nuevos conocimientos y validar dichos resultados. Uno de los problemas que en la actualidad se tiene es que las encuestas que se utilizan en distintos países, e incluso en ellos mismos, no sólo incorporan preguntas de diversas modalidades y estilos, sino que además para las respuestas que entregan los encuestados se utilizan una variedad de métodos y escalas que no permiten ser extrapolados o comparados con otros estudios. Dado que las escalas que algunos estudios utilizan, para conocer el grado de molestia que presenta la población, sin verbales, las líneas de investigación y recomendaciones internacionales sugieren que cada país desarrolle sus propias escalas y que no se remitan sólo a traducir aquellas utilizadas en otros idiomas. Esto debido que cada palabra que se utilice en las escalas encierra un concepto metrológico, esto es, que las personas le asignan un valor específico de intensidad en el continuo de grados de molestia, por lo que deben ser obtenidas para cada población bajo estudio. Esta investigación, siguiendo las recomendaciones internacionales, ha obtenido una escala verbal para ser utilizada en encuestas de percepción subjetiva de molestias por ruido en Chile, para una población de entre 15 a 65 años de edad. Se ha podido desarrollar un test para obtener dicha escala siguiendo la metodología internacional, lo que ha permitido además discutir y analizar su utilización en futuras investigaciones. Del mismo modo, se ha podido analizar la equivalencia que tiene con otras escalas que podrían ser obtenidas con esta misma metodología, así como la escala que la recomendación internacional ISO propone para el idioma español. Los resultados obtenidos permiten comprobar la necesidad de que cada país hispanoparlante desarrolle sus propias escalas lo que podría explicar, entre otros aspectos, del por qué la norma internacional aún no tiene características de oficial a falta de mayor consenso en la comunidad científica, por lo que los datos aportados en esta investigación permitirán profundizar estos y otros aspectos a los investigadores en esta materia. ABSTRACT Noise is considered as a pollutant that it is growing in importance because it has become recognized as a major annoyance in modern societies. The study of its origin and effects on populations has been the objective of numerous lines of investigation all over the world. The annoyance questionnaire is a tool that is frequently utilized in numerous countries using a variety of design methods. Nevertheless, the quantity of information collected over several years in different countries using these tools has not allowed an interrelated correlation of data because the data indicates that the different study tools designed to collect data have used varying collection techniques and measurement scales that define the exposure to different types and sources of noise pollution. In an effort to generate data and studies then can be combined to better the understanding of noise and its effects on public health, an initiative that was developed by ICBEN (International Commission of Biological Effects on Noise) was proposed in 1997 and is designed to generate and investigate studies under methodologies that allow the comparisons of different studies already undertaken and the coordination of their conclusions. These investigative tools can be used by other investigators who will be able to generate additional information and validates results. One of the currently existing problems is that the questionnaires utilized by different countries and within the same countries not only use questions based on different models and styles, but also the answers given by the subjects being interviewed are interpreted using different methods and measurement scales which do not permit direct comparison of relationship with other studies. Given the measurement tools used to obtain the reported levels of annoyance that the population experiences (without verbal response) the lines of investigation and international recommendations are that each country develops its own scale that does not rely only on verbal responses in the corresponding language. This is because each word utilized in the measurement scale has a numeric concept with which interview subjects will assign a specific numeric intensity from the continuum of levels of annoyance and must be obtained for each population under study. This investigation, which follows international recommendations, has obtained a verbal scale to be utilized in subjective perception questionnaires of noise annoyance in Chile, for a subject population of subjects between 15 and 65 years of age. It has been able to develop a test to obtain said measurement scale following the international methodology guidelines which has permitted discussion and analysis of their use by other investigators. By the same token, it has been possible to analyze the equivalency that exists between other scales that could be obtained with the same methodology including the scale as recommended by international ISO for Spanish Language. The results obtained allows proof of the necessity that each Spanish Speaking Country develop their own measurement scales which could explain, the reason why the international norm still does not have the official characteristics because of a failure of a majority consensus in the scientific community, by which the data contribution from this investigation will allow the investigator to deepen these and other aspects of the subject.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Acknowledgements: This work was supported by Wellcome Trust grants WT092552MA (J.H.N. and I.R.B.), Senior Investigator Award WT100209MA (J.H.N.), 093228 (T.K.S.) and 092970 (M.S.P.S.), and Biotechnology and Biological Sciences Research Council grants BB/I019855/1 (M.S.P.S.), BB/H017917/1 (J.H.N. and I.R.B.) and BB/J009784/1 (H.B.). We acknowledge the Diamond Light Source for beam time. I.R.B. is supported as a Leverhulme Emeritus Fellow. J.H.N. is supported as a Royal Society Wolfson Merit Award holder and as a 1000 Talent Scholar at Sichuan University. A.C.E.D. was supported by an Engineering and Physical Sciences Research Council Systems Biology Doctoral Training Centre student fellowship. We thank R. Phillips, A. Lee and S. Conway for helpful discussions.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Open Access funded by European Research Council Acknowledgments The authors thank Drs. Gilberto Fisone, Jessica Ausborn, Abdel El Manira, Gilad Silberberg, and members of the C.B. laboratory for advice, as well as Paul Williams for expert help with the graphical abstract. This study was supported by a Starting Investigator Grant from the ERC (ENDOSWITCH 261286), the Swedish Research Council (2010-3250), Novo Nordisk Fonden, and the Strategic Research Programme in Diabetes at Karolinska Institutet.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

An (independent samples comparison) controlled study was conducted to assess the efficacy of a novel approach to social skills training for children in a local socialization group at Knippenberg, Patterson & Associates (KPA). The treatment condition involved the combination of a Structured Story (i.e., novel bibliotherapy technique for children with social skills deficits), and a behavioral rehearsal (or role-play) segment, where the children practiced the target social skill featured in the Structure Story. The control group did not receive the Structured Story nor the behavioral rehearsal. Children in both groups engaged in ten-minutes of free play that was videorecorded for later observation and scoring by the principal investigator. Two target behaviors were assessed; asking a friend to play, and duration of joint play between two or more peers. The results did not show significant differences for either target variable between the group that received the novel intervention and the control group. Limitations of the current study and implications for further research are discussed.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Lying has a complicated relationship with the First Amendment. It is beyond question that some lies – such as perjury or pretending to be a police officer – are not covered by the First Amendment. But it is equally clear that some lies, even intentionally lying about military honors, are entitled to First Amendment protection. U.S. v. Alvarez, 132 S. Ct. 2537 (2012). To date, however, both Supreme Court doctrine and academic commentary has taken for granted that any constitutional protection for lies is purely prophylactic – it protects the liar to avoid chilling truthful speech. This Article is the first to argue, contrary to conventional wisdom, that certain types of lies paradoxically advance the values underlying the First Amendment. Our framework is descriptively novel and doctrinally important insofar as we provide the first comprehensive post-Alvarez look at the wide range of lies that may raise First Amendment issues. Because there was no majority opinion in Alvarez, there is uncertainty about which standard of constitutional scrutiny should apply to protected lies, an issue we examine at length. Moreover, our normative claim is straightforward: when a lie has intrinsic or instrumental value it should be treated differently from other types of lies and warrant the greatest constitutional protection. Specifically, we argue that investigative deceptions – lies used to secure truthful factual information about matters of public concern – deserve the utmost constitutional protection because they advance the underling purposes of free speech: they enhance political discourse, help reveal the truth, and promote individual autonomy. A prototypical investigative deception is the sort of misrepresentation required in order for an undercover journalist, investigator, or activist to gain access to information or images of great political significance that would not be available if the investigator disclosed her reporting or political objectives. Tactical use of such lies have a long history in American journalism and activism, from Upton Sinclair to his modern day heirs. Using the proliferation of anti-whistleblower statutes like Ag Gag laws as an illustrative example, we argue that investigative deceptions are a category of high value lies that ought to receive rigorous protection under the First Amendment. At the same time, we recognize that not all lies are alike and that in other areas, the government regulation of lies serves legitimate interests. We therefore conclude the Article by drawing some limiting principles to our theory.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

A nonempty set F is called Motzkin decomposable when it can be expressed as the Minkowski sum of a compact convex set C with a closed convex cone D. In that case, the sets C and D are called compact and conic components of F. This paper provides new characterizations of the Motzkin decomposable sets involving truncations of F (i.e., intersections of FF with closed halfspaces), when F contains no lines, and truncations of the intersection F̂ of F with the orthogonal complement of the lineality of F, otherwise. In particular, it is shown that a nonempty closed convex set F is Motzkin decomposable if and only if there exists a hyperplane H parallel to the lineality of F such that one of the truncations of F̂ induced by H is compact whereas the other one is a union of closed halflines emanating from H. Thus, any Motzkin decomposable set F can be expressed as F=C+D, where the compact component C is a truncation of F̂. These Motzkin decompositions are said to be of type T when F contains no lines, i.e., when C is a truncation of F. The minimality of this type of decompositions is also discussed.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Linear vector semi-infinite optimization deals with the simultaneous minimization of finitely many linear scalar functions subject to infinitely many linear constraints. This paper provides characterizations of the weakly efficient, efficient, properly efficient and strongly efficient points in terms of cones involving the data and Karush–Kuhn–Tucker conditions. The latter characterizations rely on different local and global constraint qualifications. The global constraint qualifications are illustrated on a collection of selected applications.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Maria-Antònia Oliver és una figura cabdal en la història de la novel·la policíaca en llengua catalana. Amb un personatge principal innovador en el panorama literari català dels anys vuitanta, Oliver destaca per una sèrie d’aspectes com són el seu personatge principal, feminista i representant del hard-boiled i la forta crítica social, especialment centrada en l’illa de Mallorca, aspectes que són objecte d’estudi en aquest article. Temes com el feminisme, l’impacte social del turisme o la situació de la llengua catalana a les Balears formen part de les seves obres i demostren el compromís social de l’autora mallorquina.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Dissertação apresentada à Escola Superior de Educação do Instituto Politécnico de Castelo Branco para o cumprimento dos requisitos necessários à obtenção do grau de Mestre em Atividade Física na especialização de Gerontomotricidade.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

The remarkable physicochemical properties of magnetic nanoparticles (MNPs) at the nanoscale have boosted the development of new and promising strategies for the simultaneous diagnosis and treatment of diseases, particularly in cancer therapy Ð the so-called theranostic applications (1). In these strategies, the intrinsic superparamagnetic properties of MNPs have been exploited to gain access into multifunctional systems able to simultaneously perform as enhanced magnetic resonance imaging (MRI) contrast agents, efficient nanocarriers for drug delivery and nanoheaters in magnetic hyperthermia based therapy (2), among others.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Hybrid magnetic carbon composites have been recently proposed as the next step in the evolution of catalysts for catalytic wet peroxide oxidation (CWPO), with several synergistic effects arising from the combination of the high catalytic activity of metal species with the proven catalytic properties of carbon-based materials in CWPO [1]. Bearing this in mind, this work sought the development of novel magnetic carbon xerogels, composed by interconnected carbon microspheres with iron (Fe) and/or cobalt (Co) microparticles embedded in their structure. As inferred from the extensive characterization performed, materials with distinctive properties were obtained upon inclusion of different metal precursors during the sol-gel polymerization of resorcinol and formaldehyde, followed by thermal annealing.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Relatório de estágio de mestrado, Educação (Área de especialidade em Administração Educacional), Universidade de Lisboa, Instituto de Educação, 2016