Search results for "AGREGAT"
showing 3 items of 3 documents
Microscopic study of He2-SF6 trimers
2003
The He2-SF6 trimers, in their different He isotopic combinations, are studied in the framework of both the correlated Jastrow approach and the correlated hyperspherical harmonics (CHH) expansion method. The energetics and structure of the He-SF6 dimers are analyzed, and the existence of a characteristic rotational band in the excitation spectrum is discussed, as well as the isotopic differences. The binding energies and the spatial properties of the trimers, in their ground and lowest lying excited states, obtained by the Jastrow ansatz are in excellent agreement with the results of the converged CHH expansion. The introduction of the He-He correlation makes all trimers bound by largely sup…
Utilization of microbial abundance and diversity as indicators of the origin of soil aggregates produced by earthworms
2013
This study aimed at testing the capability of microbial community structure and abundance to be used as bioindicators of the origin of earthworm cast aggregates. Compact surface casts produced by Amynthas khami and surrounding aggregates lacking visible signs of biological activity (control) were left to disaggregate by natural rainfall and separated into four size classes (5-2, 2-0.5, 0.5-0.25 and <0.25 mm). The genetic structure and the abundance of the bacterial and fungal communities were characterized using B- and F-ARISA fingerprinting approach and quantitative PCR directly from DNA extracted from soil. Bacteria and to a lesser extent fungi were more abundant in casts than in control …
Nanodaļiņu defektu agregatizācijas pētījumi 2D dzelzs režģī: kinētiskā Monte Karto modelēšana
2018
Ar oksīdu nanodaļiņām stiprinātajiem (ODS) tēraudiem novērojamas tādas teicamas īpašības kā termālā noturība, radiācijas defektu radītās dislokāciju mobilitātes un hēlija implantācijas radīto efektu mazināšana. ODS tēraudi ir daudzsološi materiāli ar potenciālu pielietojumu IV paaudzes kodolreaktoros un kodolsintēzes reaktoros. Tomēr tehnoloģiski sarežģīti ir izveidot ODS tēraudu materiālu, kurā būtu liela koncentrācija nanometra izmēru klasteru. Tāpēc šī darba mērķis ir izprast nanodaļiņu (piemēram, Y2O3) veidošanās principus, lai varētu optimizēt ODS tēraudu ražošanas tehnoloģiju. Darba gaitā izveidots kinētiskais Monte Karlo modelis (KMC), kas apraksta nanodaļiņu agregatizāciju vienkāršo…