Search results for " ai"
showing 10 items of 2441 documents
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…
MACC regional multi-model ensemble simulations of birch pollen dispersion in Europe
2015
Abstract. This paper presents the first ensemble modelling experiment in relation to birch pollen in Europe. The seven-model European ensemble of MACC-ENS, tested in trial simulations over the flowering season of 2010, was run through the flowering season of 2013. The simulations have been compared with observations in 11 countries, all members of the European Aeroallergen Network, for both individual models and the ensemble mean and median. It is shown that the models successfully reproduced the timing of the very late season of 2013, generally within a couple of days from the observed start of the season. The end of the season was generally predicted later than observed, by 5 days or more…
Optimisation of Heat Loss through Ventilation for Residential Buildings
2018
This study presents the results of research on heat loss from various types of residential buildings through ventilation systems. Experimental research was done to analyse the effectiveness of ventilation systems of different types and determine the parameters of air discharged via the ventilation ducts. A model of heat loss from the discharge of exhaust air outside through air ducts has since been developed. Experiments were conducted on three experimental systems of building ventilation: gravitational, mechanical, and supply-exhaust ventilation systems with heat recovery. The proposed model dependencies were used to chart the daily fluctuations of the optimum multiplicity of air exchange …
Influence of gas environment on the dynamics of wetting transition of laser-textured stainless steel meshes
2021
We analyze the role of surrounding gas and aging in ambient air in the wettability behavior of laser-processed stainless steel meshes. Laser texturing of meshes was carried out in the presence of different gases (N2, O2, CO2, Ar, and SF6) in ambient atmospheric air and under different vacuum conditions. The influence of each gas on the evolution of the wettability properties after aging in ambient air is analyzed. The effects of low-pressure and vacuum aging allowed transforming the initial superhydrophilic characteristics of the laser-structured meshes to an almost superhydrophobic state.
RADIONUCLIDE CONCENTRATIONS IN AIR PARTICULATE AT PALERMO (ITALY) FOLLOWING FUKUSHIMA ACCIDENT
2012
Following the Fukushima accident, a series of samplings were carried out with a daily frequency to detect the arrival of radioactive contamination in air at Palermo (Italy) and to follow its evolution during the time. Air particulate collection was performed by suction of atmospheric air through cellulose filter paper by means of a high-volume air sampler (∼15 000 m(3) d(-1)). Spectrometric analysis of the filters highlights the presence of (131)I, (134)Cs, (137)Cs and, only for a few samples, traces of (132)Te-(132)I and (136)Cs. Maximum airborne concentrations were 883 μBq m(-3) for (131)I (only particulate), 81 μBq m(-3) for (137)Cs and 70 μBq m(-3) for (134)Cs. From a dose to population…
Lubāna ledus loba veidotās reljefa formas Atzeles pacēlumā
2022
Grīnbauma, I. 2022. Lubāna ledus loba veidotās reljefa formas Atzeles pacēlumā. Maģistra darbs. Rīga, Latvijas Universitāte, Ģeogrāfijas un Zemes zinātņu fakultāte. Maģistra darbā tika analizētas glaciālās reljefa formas un to izkārtojums Austrumlatvijā, Atzeles pacēlumā, pielietojot 1 m izšķirtspējas digitālo reljefa modeli, kas iegūts no lāzerskenēšanas datiem. Pētījuma teritorija atrodas Fenoskandijas ledus vairoga dienvidaustrumu sektorā, kur uzvirzījās Lubāna ledus lobs. Pētījuma teritorijas glaciālā ģeomorfoloģija nodrošina lielisku iespēju pētīt zemledāja apstākļus un ledus loba plūsmu un iespējamos uzplūdus. Lubāna ledus loba atstātās “pēdas” robežojas no lielizmēra glaciālajiem lin…
Cietušais kriminālprocesa izpratnē
2019
Bakalaura darba temats ir “Cietušais kriminālprocesa izpratnē”. Cietušais kriminālprocesā ir persona, kurai ar noziedzīgu nodarījumu nodarīts kaitējums – fizisks, morāls vai mantisks. Bakalaura darba mērķis ir izprast cietušā jēdziena būtību kriminālprocesa ietvaros, kā arī to, kādā veidā cietusī persona var tikt atzīta par cietušo kriminālprocesā. Bakalaura darbā tiks pētīts arī ne tik sen ieviestu īpaši aizsargājamā cietušā institūtu un tā nozīmi kriminālprocesā. Mērķa sasniegšanai autore bakalaura darbā centās nošķirt jēdzienu “upuris” no jēdziena “cietušais” kriminālprocesa izpratnē. Tika pētīts kādas izmaiņas ir skārušas Kriminālprocesa likumu pēc Direktīvas 29/12/ES ieviešanas un kā š…
Neural Processing of Congruent and Incongruent Audiovisual Speech in School-Age Children and Adults
2017
Prior Precision Modulates the Minimization of Auditory Prediction Error
2019
International audience; The predictive coding model of perception proposes that successful representation of the perceptual world depends upon canceling out the discrepancy between prediction and sensory input (i.e., prediction error). Recent studies further suggest a distinction to be made between prediction error triggered by non-predicted stimuli of different prior precision (i.e., inverse variance). However, it is not fully understood how prediction error with different precision levels is minimized in the predictive process. Here, we conducted a magnetoencephalography (MEG) experiment which orthogonally manipulated prime-probe relation (for contextual precision) and stimulus repetition…
Promocijas darbs
2011
Elektroniskā versija nesatur pielikumus