Search results for " changes"
showing 4 items of 824 documents
Modelling the removal and reversible immobilization of murine noroviruses in a Phaeozem under various contamination and rinsing conditions
2018
International audience; Enteric viruses entering the soil with contaminated irrigation water can reach groundwater or be internalized in plants through their roots without being inactivated. Their fate in the soil depends on the virus, the soil and the soil solution. In order to write a mathematical model suitable for a Calcaric Phaeozem, we investigated the removal of murine norovirus and reversible immobilization in aggregate columns according to a saturation procedure, conditions between contamination and rinsing time, temperature and soil solution. Viruses were quantified before and after 0.45‐μm filtration with an RT‐qPCR (real‐time polymerase chain reaction). Experimental results supp…
The influence of ENSO on South Africa winter rainfall
2011
International audience; We analysed the relationship between El Niño Southern Oscillation (ENSO) and South Africa austral winter rainfall using a 682 raingauges daily rainfall database documenting the period 1950-1999. The May, June and July (MJJ) seasonal rainfall amount shows a positive correlation with the Niño3.4 index that becomes significant since the mid 70's. Wet spells properties (length, frequency and intensity) at the raingauge scale indicate that high (low) MJJ seasonal rainfall amounts recorded during El Niño (La Niña) events are the result of longer (shorter) wet spells in the Cape Town area and more (less) frequent wet spells north of 33°S. Wet spells with daily rainfall amou…
Acs zīlītes monitoringa ierīces izveide
2021
Maģistra darbs „Acs zīlītes monitoringa ierīces izveide” uzrakstīts latviešu valodā, datorsalikumā uz 36 lapām. Tas satur 28 attēlus, 3 tabulas un 26 atsauces uz literatūras avotiem. Darba mērķis: Izveidot mobilu acs zīlītes reakcijas analītisko ierīci, kas ieraksta acs zīlītes lieluma izmaiņas dinamikā. Metode: Darbā no komerciāli pieejamām elektronikas komponentēm tika izveidota ierīce – brilles, ar kurām var mērīt zīlītes lieluma izmaiņas nēsāšanas laikā. Secinājumi: Ar pieejamajiem materiāliem un programmēšanas risinājumiem ir iespējams izveidot ierīci zīlītes lieluma monitoringam, bet ir nepieciešama ierīces smalkāka testēšana un kalibrēšana, lai tā būtu pielietojama dinamiskiem mērīju…
Carbon cycle and sea-water palaeotemperature evolution at the Middle-Late Jurassic transition, eastern Paris Basin (France).
2014
14 pages; International audience; A very high-resolution carbon and oxygen stable isotope analysis (bulk-carbonate) of a biostratigraphically well-constrained Callovian-Oxfordian series is provided here for the first time. The homogeneity of the clayey series and the weak diagenetic alteration allow the isotopic signal variations to be considered as primary in origin. A prominent and brief negative excursion in the δ13C curve (−2‰), occurring at the start of the Middle Callovian (Jason Zone - Obductum Subzone) and correlated regionally, suggests a possible methane release. The increasing δ13C values thereafter up to the Early Oxfordian, concomitant with a warming episode, highlight the buri…