Search results for "chat"
showing 10 items of 259 documents
Modificētas, pārskatītas aptaujas autiskā spektra traucējumu noteikšanai mazbērna vecumā – ar papildjautājumiem (M–CHAT–R/F)™ adaptācija latviešu val…
2020
Pētījuma mērķis: adaptēt Modificētu, pārskatītu aptauju autiskā spektra traucējumu noteikšanai mazbērna vecumā– ar papildjautājumiem (M–CHAT–R/F)TM (Modified Checklist for Autism in Toddlers, Revised, with Follow–Up , Robins, Fein & Barton, 2018) latviešu valodā. Pētījuma piedalījās 240 respondenti (227 sievietes un 13 vīrieši), vecumā no 21 līdz 61 gadiem, kuriem ir bērni vecumā no 16 līdz 30 mēnešiem. Vecāki aizpildīja aptaujas par 125 meitenēm (52.1%) un 115 zēniem (47.9%). Pētījuma rezultāti rāda, ka M–CHAT–R/F ir piemērota lietošanai, jo tā aizsniedz savu mērķi – noteikt, kuriem bērniem ir zems, vidējs vai augsts AST risks. Saņemot atļauju no M–CAHT–R/F autoriem, tika veiktas nelielas …
Characterization of automotive shredder residues before and five years after landfill disposal
2015
The paper illustrates the results of an extensive analytical characterization study of automotive shredder residues (ASR), also known as "fluff". The analyses concerned material fractions and their content, with special reference to heavy metals (e.g. Cd, Cr, Hg, Pb, Cu) and arsenic. Elution tests on the original materials were also conducted. Moreover, chemical concentrations of ASR samples after about five years' landfill residence was assessed, in order to verify possible changes resulting from both in-situ leaching and organic matter degradation phenomena. Results show that lead seems to be the most critical element in view of possible ASR acceptance in non-hazardous waste landfills bec…
Effect of single-species and mixed-species leaf leachate on bacterial communities in biofilms
2009
Dissolved organic matter in the form of leaf leachate represents an important carbon and energy source in many lotic ecosystems. In this study, we investigated utilization of mono-specific and mixed-species leaf leachate and impacts on biofilm bacterial community structure. Ceramic tiles were incubated in a Northeast Ohio stream to allow for biofilm development and then exposed in the laboratory to glucose or leachate from: sugar maple (Acer saccharum), pin oak (Quercus palustris), maple oak, American beech (Fagus grandifolia), witch hazel (Hamamelis virginiana), or beech witch hazel. Bacterial responses to these amendments were compared to un-amended controls based on fluorescent in situ h…
Biological nitrogen removal from landfill leachate: a pilot-scale study
1999
A pilot-scale two-stage process including an anaerobic pretreatment (up-flow anaerobic sludge blanket, UASB) unit and a pre-denitrification activated sludge process was studied for treating leachates from a municipal landfill (waste aged 4 to 5 years, area 2.5 ha) and from a windrow composting area (1ha). A single-stage pilot process was used for nitrification studies. The leachate characteristics were as follows: COD 740 to 2400 mg 1-1 (chemical oxygen demand), BOD7 (biochemical oxygen demand) approximately 1000 mg 1 -1, Ntot 40 to 120 mg 1-1 and the temperature was between 2 and 21°C. The results show that 45 to 50% COD removal could be achieved in the UASB reactor even at temperatures b…
Anaerobic and sequential anaerobic-aerobic treatments of municipal landfill leachate at low temperatures
1996
Abstract Anaerobic treatment of municipal landfill leachate (COD 1–4 g l −1 , NH 4 -N c. 0.16 g l −1 ) was studied at 11 and 24°C by using laboratory-scale UASB and hybrid reactors. Aerobic post-treatment of the anaerobically treated leachate was also studied at 24°C using an activated-sludge process. In the 11°C reactors, a COD removal of up to 60–65% was obtained with 1.5-2 day HRT and 0.7-1.5 kg COD m −3 day −1 organic loading rates. At 24°C, a COD removal of up to 75% was achieved with a 10 h HRT. The highest organic loading rate applied was 10 kg COD m −3 day −1 at 24°C. Inorganic material accumulated in the reactor sludges at both temperatures. However, the specific methanogenic activ…
Leachate formation and characteristics from gasification and grate incineration bottom ash under landfill conditions
2011
Characteristics and formation of leachates from waste gasification and grate firing bottom ash were studied using continuous field measurements from 112 m(3) lysimeters embedded into landfill body for three years. In addition, the total element concentrations of the fresh ash were analysed and laboratory batch tests were performed to study leachate composition. The three-year continuous flow measurement showed that about one fifth of the leachates were formed, when the flow rate was200 l/d, covering3.5% of the study time. After three years, the liquid/solid-ratio for the quenched grate ash was 1 (l/kg (d.m.)) and for the initially dry gasification ash 0.4 (l/kg (d.m.)). The low initial wate…
Microbial acidification and pH effects on trace element release from sewage sludge.
2003
Leaching of sludge-borne trace elements has been observed in experimental and field studies. The role of microbial processes in the mobilization of trace elements from wastewater sludge is poorly defined. Our objectives were to determine trace element mobilization from sludge subjected to treatments representing microbial acidification, direct chemical acidification and no acidification, and to determine the readsorption potential of mobilized elements using calcareous sand. Triplicate columns (10-cm diameter) for incubation and leaching of sludge had a top layer of digested dewatered sludge (either untreated, acidified with H2SO4, or limed with CaCO3; all mixed with glass beads to prevent …
Toxicity of waste gasification bottom ash leachate
2011
Abstract Toxicity of waste gasification bottom ash leachate from landfill lysimeters (112 m3) was studied over three years. The leachate of grate incineration bottom ash from a parallel setup was used as reference material. Three aquatic organisms (bioluminescent bacteria, green algae and water flea) were used to study acute toxicity. In addition, an ethoxyresorufin-O-deethylase (EROD) assay was performed with mouse hepatoma cells to indicate the presence of organic contaminants. Concentrations of 14 elements and 15 PAH compounds were determined to characterise leachate. Gasification ash leachate had a high pH (9.2–12.4) and assays with and without pH adjustment to neutral were used. Gasifi…
LES DETERMINANTS A L'ACHAT DE PRODUITS ISSUS DU COMMERCE EQUITABLE : UNE APPROCHE PAR LES CHAINAGES COGNITIFS
2006
In this research, we examine the motives underlying fair trade product purchase through two studies using a means-end methodology. Considering the growth of fair trade product consumption and the expansion of its distribution in two different distribution networks, a first exploratory research has been led. It shows that motives and, more particularly, means-end chains underlying fair trade coffee purchase differ depending on the types of retail store chosen (specialized shop vs. Supermarket). Then, fair trade coffee buyers who shop in supermarket have been interviewed in a second study. In the one hand, it permits to define choice criteria, consequences and values underlying this purchase,…
Conversazioni umane e artificiali
2023
C’è una caratteristica centrale che distingue ChatGPT e simili da un interlocutore umano: pur sapendo rispondere in modo coerente e creativo a richieste anche complesse, sono del tutto incapaci di proporre contenuti conversazionali non puramente reattivi, manca, all’AI, la parte “affiliativa” della conversazione