Search results for "DSO"
showing 10 items of 1609 documents
Effect of Mg2+ ions on competitive metal ions adsorption/desorption on magnesium ferrite : mechanism, reusability and stability studies
2021
The adsorption behavior of magnesium ferrite in single- and multicomponent metal ions solutions in the presence of Mg2+ ions were studied. A dramatic decrease in the adsorption capacity of magnesium ferrite towards Mn2+, Co2+, and Ni2+ ions for comparison study of single- and multicomponent solutions was established. The affinity of the sorbent in accordance with the maximum sorption capacities increases in the following order Cu2+ > Co2+ > Ni2+ > Mn2+. High efficiency of magnesium ferrite regeneration (~100%) with aqueous solutions of magnesium chloride in the concentration range of 0.001-0.1 M was shown. The low degree of toxic metal ions desorption combined with XRD, IR spectroscopy, and…
Naturalismo e razionalità
2008
Joukkoistamisen käyttö vaatimusmäärittelyssä : tapaustutkimus
2017
Tämän pro gradu -tutkielman lähtökohta oli tutkia, miten joukkoistamista voidaan käyttää vaatimusmäärittelyssä. Kirjallisuuskatsauksen lisäksi luotiin joukkoistetun vaatimusmäärittelyn malli sekä tehtiin tapaustutkimus KoiraNet jalostustietojärjestelmän MH-luonnekuvausta koskevaan dataan liittyvien käyttötarpeiden selvittämisestä ja joukkoistetusta vaatimusmäärittelystä. Joukkoistaminen tapahtui projektia varten luodussa Facebook-ryhmässä, johon saatiin avoimella kutsulla kaikkiaan 107 jäsentä. Tutkimuksen tuloksiin lukeutui paitsi kerätyt vaatimukset, myös joukon aktiivisuudesta tehdyt määrälliset havainnot. Joukkoistamalla kerättyjen vaatimusten laadun arvioimiseksi suoritettiin erilliset…
Designing education democratically through deliberative crowdsourcing : the case of the Finnish curriculum for basic education
2020
In Finland, curriculum design is allegedly carried out through a deliberative process that involves various stakeholders, interest groups, experts and ordinary citizens. To facilitate participation in curriculum design, online crowdsourcing has been applied. The objective of this study is to explore to what extent the design process of the latest Finnish national curriculum for mathematics was open, democratic and deliberative. The theoretical framework of the study is the theory of democratic will-formation of the German philosopher Jürgen Habermas. The comments given on the early version of the core curriculum of mathematics were analysed using directed content analysis, in which the abov…
The People’s Assembly: Testing the Collaborative (e)-Democracy
2020
This paper aims to critically analyse the Estonian People’s Assembly (EPA), a crowdsourcing initiative carried out from 2013 to 2014. During the project, citizens could participate in decision-making and make proposals for laws and policies on a dedicated web-platform. Additionally, some people were invited for a traditional off-line debate. In that way, the project combined virtual communication tools with traditional discussion to apply the principles of collaborative e-democracy, in which governmental stakeholders and non-governmental stakeholders (such as local communities) join in a deliberative debate. The purpose of this paper is to observe, both, gains and problems of this crowdsour…
Pimeä aine – internetin piilevä potentiaali
2014
Computational studies of gold-absorbate complexes on modified oxides
2016
While bulk gold is known for its chemical inertness, nanosized gold clusters are active catalysts for a variety of important reactions. For some practical applications gold clusters are supported and the cluster-support interaction can modify the cluster's properties. The knowledge of this interaction can be vital for obtaining desired cluster properties. In this thesis, the adsorption of Au atoms and clusters on modified oxide surfaces is studied using density functional theory (DFT) calculations. The support effects are considered by direct analysis of the adsorbed Au and using other coadsorbates as reactivity probes. Doping the CaO(001) surface by replacing a cation with a high valence d…
Phosphorous removal from human urine using lateritic soil
2023
Phosphorous (P) in human urine is among the macronutrients in municipal wastewater that has exacerbated eutrophication of water bodies. Adsorption of P from wastewater using cost effective, environmentally friendly, and efficient adsorbents is considered as an attractive method that can both mitigate the eutrophication problem and augment the already strained P reserves. In the present study the adsorption capacity and structural properties of lateritic soil (LS), the adsorbent for removal of P from human urine, was investigated using XRF, SEM, TGA and FTIR techniques. Batch adsorption experiments were conducted to determine various adsorption parameters such as the sorption rates, the conc…
SMART SfM: SALINAS ARCHAEOLOGICAL MUSEUM
2017
Abstract. In these last years, there has been an increasing use of the Structure from Motion (SfM) techniques applied to Cultural Heritage. The accessibility of SfM software can be especially advantageous to users in non-technical fields or to those with limited resources. Thanks to SfM using, everyone can make with a digital camera a 3D model applied to an object of both Cultural Heritage, and physically Environment, and work arts, etc. One very interesting and useful application can be envisioned into museum collection digitalization. In the last years, a social experiment has been conducted involving young generation to live a social museum using their own camera to take pictures and vid…
LFER and the Effect of Temperature on Oxyanion Adsorption by Goethite
2019
A linear relationship between the Gibbs free energy, ΔGr,H+, of the aqueous complex deprotonation reaction, and the Gibbs free energy, ΔGr,ads, of bidentate surface complexation reaction of oxyanions was derived from modelling of temperature dependent batch equilibrium adsorption experiments. As exemplified in this study, this relationship may be exploited to predict temperature-dependent adsorption behavior of oxyanions not yet known such as pertechnetate.