Search results for "Asses"
showing 10 items of 5931 documents
Origin of atmospheric aerosols at the Pierre Auger Observatory using studies of air mass trajectories in South America
2014
The Pierre Auger Observatory is making significant contributions towards understanding the nature and origin of ultra-high energy cosmic rays. One of its main challenges is the monitoring of the atmosphere, both in terms of its state variables and its optical properties. The aim of this work is to analyze aerosol optical depth $\tau_{\rm a}(z)$ values measured from 2004 to 2012 at the observatory, which is located in a remote and relatively unstudied area of the Pampa Amarilla, Argentina. The aerosol optical depth is in average quite low - annual mean $\tau_{\rm a}(3.5~{\rm km})\sim 0.04$ - and shows a seasonal trend with a winter minimum - $\tau_{\rm a}(3.5~{\rm km})\sim 0.03$ -, and a sum…
GC–MS characterization of contemporary pesticides in PM10 of Valencia Region, Spain
2012
Pesticides in the inhalable fraction of particulate matter (PM10) should be well tracked in order to contribute information to future exposure assessment in individuals of the general public. A total of 40 current-used pesticides and metabolites were searched for in ambient air samples collected from January through December 2010. The samples were taken from one remote, one urban and three rural sites in Valencia Region (Spain) and analyzed using liquid chromatography coupled to mass spectrometry in tandem (LC-MS/MS). In the PM10 fraction 17 pesticides and metabolites were detected overall, two of them currently banned (carbofuran and omethoate, although the latter is a metabolite of the pe…
Indoor air pesticide in dwellings of breastfeeding mothers of the Valencian Region (Spain): Levels, exposure and risk assessment
2021
This study assessed the inhalation risk associated with indoor pesticide concentrations in the dwellings of 41 lactating mothers living in the Valencian Region, Spain, who were participants in the BETTERMILK project. Twenty-eight substances were investigated, including pyrethroid (PYRs), organophosphate (OPPs), and organochlorine (OCPs) pesticides. Bifenthrin, cypermethrin, lambda-cyhalothrin, malathion, permethrin and pyrimethanil were detected with frequencies ranging from 2% (malathion) to 80% (cypermethrin), and with an arithmetic mean concentration ranging from 4.1 ng m(-3) (bifenthrin) to 12.1 ng m-(3) (cypermethrin). The indoor air analysis was combined with several surveys to assess…
New screening approach for risk assessment of pesticides in ambient air
2014
We present a novel screening approach for inhalation risk assessment of currently used pesticides (CUPs) in ambient air, based on the measurements of pesticide levels in the inhalable fraction of the particulate matter (PM10). Total concentrations in ambient air (gas + particle phases) were estimated using a theoretical model of distribution of semi-volatile organic compounds between the gas and the particulate phase based on the octanol-air partition (K-oa) of each pesticide. The proposed approach was used in a pilot study conducted in a rural station in Valencia (Spain) from April through to October 2010. Twenty out of 82 analysed pesticides were detected in average concentrations ranging…
Vegetation fire emissions and their impact on air pollution and climate
2009
Gaseous and particulate emissions from vegetation fires substantially modify the atmospheric chemical composition, degrade air quality and can alter weather and climate. The impact of vegetation fire emissions on air pollution and climate has been recognised in the late 1970s. The application of satellite data for fire-related studies in the beginning of the 21th century represented a major break through in our understanding of the global importance of fires. Today the location and extent of vegetation fires, burned area and emissions released from fires are determined from satellite products even though many uncertainties persist. Numerous dedicated experimental and modeling studies contri…
Sawtooth-wave adiabatic-passage slowing of dysprosium
2018
We report on sawtooth wave adiabatic passage (SWAP) slowing of bosonic and fermionic dysprosium isotopes by using a 136 kHz wide transition at 626 nm. A beam of precooled atoms is further decelerated in one dimension by the SWAP force and the amount of atoms at near zero velocity is measured. We demonstrate that the SWAP slowing can be twice as fast as in a conventional optical molasses operated on the same transition. In addition, we investigate the parameter range for which the SWAP force is efficiently usable in our set-up, and relate the results to the adiabaticity condition. Furthermore, we add losses to the hyperfine ground-state population of fermionic dysprosium during deceleration …
PATRONES DIFERENCIALES ENTRE PADRES Y PROFESORADO EN LA DETECCIÓN DE TDAH
2015
INTRODUCTION . The diagnosis of Attention Deficit Disorder with Hyperactivity (ADHD) has increased in recent years. The criteria for ADHD have become clearer in the scientific community. However, it is a complex disorder that requires the participation of a multidisciplinary team for an appropriate diagnosis. METHOD . Taking as a sample (N = 331) 6 to 9 year-old students from Cuenca, this study analyzed the existence of differential patterns between the two ratings, using the EMA-D.D.A. Scales (Garcia-Perez y Magaz, 2006). Different approaches to hypothesis testing are used, and the internal consistency of the scales is valued. RESULTS . The differences observed suggest differential influen…
What is the Right Mix? Toward a Compensatory Theory of Employer Attractiveness
2021
Despite its long history, employer attractiveness research so far has almost exclusively studied large corporate firms and focused on the question which employer benefits influence firms’ employer attractiveness. However, we know only little about to what extent these findings generalize to more resource-constrained firms, such as small companies and start-ups. To address this void in the literature, this study integrates the theory of instrumental-symbolic employer benefits with a neo-configurational perspective to propose and test a compensatory theory of employer attractiveness that explains how start-ups achieve high employer attractiveness. Using set-theoretic methods, we analyze 219 s…
Desenvolupament i validació d'una metodologia per a l'avaluació de la cultura de seguretat per mitjà de l'observació de reunions de treball en una ce…
2010
L'objectiu d'aquest treball és descriure el desenvolupament i la validació d'una metodologia per a avaluar la cultura de seguretat per mitjà de l'observació de reunions de treball. Es va partir de la definició de cultura de seguretat més estesa dins el sector (International Atomic Energy Agency, 1991), les cinc dimensions que presenta i els atributs corresponents. La validesa d'aquesta metodologia es posà a prova en una central nuclear mitjançant l'observació d'un total de 36 reunions de treball de naturalesa molt diversa. Els resultats indiquen que l'observació de les reunions és un mètode útil per a l'avaluació de la cultura de seguretat. Comparada amb els mètodes tradicionals per a fer a…
Avaluant la responsabilitat social universitària: el cas del centre de ciències humanes, socials i agràries de la Universitat Federal de Paraiba (Bra…
2019
espanolEl presente articulo, producido a partir de un estudio de caso, aborda la cuestion de la Responsabilidad Social Universitaria (RSU) en el Brasil. Basado en una Metodologia de Evaluacion da RSU, que busca identificar las evidencias objetivas sobre las acciones desarrolladas por las instituciones de educacion superior a partir de siete indicadores de Responsabilidad Social (inclusion social; desarrollo economico y social; defensa del medio ambiente; defensa del patrimonio y memoria cultural; defensa de la produccion artistica e defensa de la produccion deportiva y salud), se analizan las acciones concretas implantadas por el Centro de Ciencias Humanas, Sociales y Agrarias (CCHSA) da Un…