Search results for " expo"
showing 10 items of 1465 documents
Maximum exposure levels for xylene, formaldehyde and acetaldehyde in cars.
2004
Although millions of individuals are exposed to emissions from articles inside cars, relatively little has been published about possible adverse health effects and about exposure levels that can be considered safe or "acceptable". Xylene, formaldehyde and acetaldehyde represent typical examples of relevant volatile organic substances (VOC) released from articles inside cars. Recently, a concept for derivation of maximum exposure levels for volatile organic substances in cars has been published. In the present study we applied this concept to derive maximum exposure levels for xylene, formaldehyde and acetaldehyde and compared the resulting concentrations to exposure levels usually found ins…
Tracer diffusion properties of core-shell latex films studied by photoinduced grating relaxation
2007
This article reports the application of the Photo-Induced Grating Relaxation technique (also known as Forced Rayleigh Scattering) to investigate the dynamics of films prepared from structured core–shell latex particles via the transport property of the photochromic tracer molecule Aberchrome 540®. The core–shell particles were prepared with a fluoropolymer core (immiscible and impenetrable to the tracer) and a poly(butyl methacrylate) shell. The incompletely dried films (with residual water) manifest their spatial heterogeneity via non-Fickian behavior (spatial scale- dependent apparent diffusion coefficient). The diffusion data was interpreted using the two-state diffusion model, previousl…
A new equipment to measure the combined effect of humidity, temperature, mechanical stress and UV exposure on the creep behaviour of polymers
2008
To be able to study and predict the physical properties of a polymeric material under different environmental conditions is very important. Moisture, UV irradiation, thermal and mechanical stresses can dramatically change the characteristics of the material and hinder some specific applications. In this work, a new equipment able to perform creep tests under different environmental conditions (temperature, humidity, stress) is presented. Some preliminary results are also presented using a sample of polyamide 6. As this polymer is sensitive to all these variables, it is appropriate to verify the effectiveness of the new instrument.
Addressing Exposome: An Innovative Approach to Environmental Determinants in Pediatric Respiratory Health
2022
Developmental age is particularly vulnerable to impacts of environmental exposures. Until recent years, the field of environment and child health has predominantly relied on the study of single exposure–health effect relationships. The exposome is an emerging concept in epidemiology, encompassing the totality of the exposures experienced by an individual throughout life and their changes over time. This innovative approach provides a risk profile instead of individual predictors. Exposome research may contribute to better understand the complex relationships between environmental exposures and childhood respiratory health, in order to implement prevention strategies and mitigate adverse hea…
Le bruit en milieu urbain : bruit et scolarité à Besançon
2009
Cuando la historia está presente: Argumentos a favor de la sociología histórica
2019
Sociology and history have maintained a discontinuous relationship and a permanent discussion. Classical sociology is intrinsically historical, but after the first theoretical synthesis the dialogue between both disciplines was extinguished and it has often been necessary to defend the need for the historical view in sociology from the margins of the dominant paradigm. However, as a specialty or subdiscipline, historical sociology has consolidated its own academic space and a strong theoretical, methodological and conceptual body. In Spain this process of institutionalization has not yet success. In this article we expose a few arguments in defense of historical sociology, both theoretical …
Līdzdalības didaktiskās stratēģijas kā dažādības pedagoģiskais risinājums vidusskolēniem STEM kompetenču iegūšanas procesā
2017
Mūsdienu pasaulē, kur tehnoloģijas nemitīgi turpina attīstīties, skolotājiem ir nepieciešams pielietot šo iespaidīgo rīku, lai rosinātu ieinteresētību skolēnos un motivētu viņus. Viens no Meksikas Vidējās izglītības sistēmas reformas mērķiem ir attīstīt vispārējas un disciplināras kompetences Fizika IV priekšmetā starp dažādiem vidusskolas skolēniem. Lai sasniegtu šo mērķi, tiek izmantotas tādas didaktiskās stratēģijas kā prezentācijas klasē un savstarpēja sadarbība starp skolēniem, kas tiek papildinātas ar Robert Marzano Dimensiju teoriju, konstruktīvisma fokusu un padziļinātu mācību apguvi. Pielietojot šīs stratēģijas, tiek demonstrēts, ka motivēti skolēni strādā labāk, apgūst kompetences…
Aplicación de la cromatografía líquida acoplada a la espectrometría de masas para la evaluación de la exposición interna a contaminantes alimentarios
2020
La contaminación química es actualmente un grave problema de salud pública. La producción de sustancias químicas aumenta a un ritmo vertiginoso, y aunque los países desarrollados (OECD) producen la mayoría de las mismas, el crecimiento en países como Brasil, India, Indonesia, China o Sudáfrica (BRIICS) se produce con mayor velocidad. Un porcentaje elevado de estas sustancias son potencialmente peligrosas para la salud, y el ser humano está expuesto a las mismas principalmente mediante ingestión, inhalación o por vía dérmica. Consecuentemente, es importante para la protección de la salud estudiar el grado de exposición de la población a las distintas sustancias químicas, ya sea mediante la m…
SULT1A1 gene deletion in BRCA2-associated male breast cancer: a link between genes and environmental exposures?
2013
SULT1A1, a member of sulfotransferase superfamily, is a drug and hormone metabolizing enzyme involved in the metabolism of a variety of potential mammary carcinogens of endogenous and exogenous origin. Interestingly, the metabolic activity of SULT1A1 can be affected by varia- tions in gene copy number. Male Breast Cancer (MBC) is a rare disease and less investigated disease compared to female BC (FBC). As in FBC, the concurrent effects of genetic risk factors, particularly BRCA2 mutations, increased exposure to estrogens and environmental carcinogens play a relevant role in MBC. By quantitative real-time PCR with TaqMan probes, we investigated the presence of SULT1A1 gene copy number variat…
Más allá de Marx: postobrerismo y posmarxismo. Una revisión de los fundamentos teóricos de la multitud y el pueblo
2018
The article is a synthetic essay that exposes the main theoretical lines of the postmarxist approach of Laclau and Mouffe, on the one hand, and the autonomist post-operaism of Negri, Hardt, Virno, etc., on the other hand. These theories are conceived as attempts to rationalize current political bets by various political sectors and social movements. It analyzes both argumentative strategies from «orthodox» Marxism and the structure / superstructure relationship; and the forms of constitution of new subjectivities. It compares the theoretical fundamentals of hegemonic articulations and counter-power experiences. It discusses, likewise, the scope and limitations of the categories of «people» …