Search results for "uhka"
showing 10 items of 53 documents
Selective recovery of phosphorus as AlPO4 from silicon-free CFB-derived fly ash leachate
2018
The prospect of phosphorus (P) recovery from siliceous fly ash was investigated. The phosphorus content in the pristine fly ash was 1.21%. Obtaining pure phosphorus products from fly ash is very challenging because of high concentration of other elements, silicon (Si) at 17.3% being the major contaminant. The fly ash was fractionated with sieve size of 125 μm to concentrate the phosphorus in the small-size fraction, which also facilitated the removal of 78% of silica (Si) in the solid phase. The fractionated fly ash was treated with 8 M HCl in order to remove 98% of Si by aging (5 h) of leachate until precipitation of Si-gel, and a phosphorus-rich solution is obtained. Iron (Fe) is also con…
Online Communities and Gambling Behaviors : a Systematic Review
2022
Abstract Purpose of Review The internet and virtual environments have enabled the formation of online communities around a variety of interests. Online communities focused on gambling are increasingly popular and attract users to interact and share ideas and experiences with likeminded others. This study reviews evidence from the latest research examining the role of online communities in gambling behaviors and gambling problems. Recent Findings A systematic literature search resulted in 17 studies. Research shows that online communities are used for diverse reasons like discussing gambling experiences and problems, sharing tips, and celebrating winnings with others. These reasons of online…
I will send badass viruses. Peer threats and the interplay of pretend frames in a classroom dispute
2014
This paper explores threats as they appear in children's everyday dispute interactions. The main purpose is to extend understandings of children's interactions and disputes in order to show how young boys construct threats in pretend frames within a classroom peer dispute by drawing upon the resources of the video game world and a verbally constructed fight. The conceptual and methodological frameworks underpinning the analysis are conversation analysis and Goffman's concept of frame. The analysis focuses on one episode that illustrates how the boys, in the absence of the teacher, invoke, share and switch frames within the dispute. Using pretence, they posit threats and build attack strateg…
Occurrence and recovery potential of rare earth elements in Finnish peat and biomass combustion fly ash
2019
Rare earth elements (REEs) are highly important in the modern society as a result of their wide use in various fields of industry. Their high supply risk and increase in demand has led to classification as critical materials, and consequently, new resources for REEs are being prospected widely. Coal fly ash has been suggested as a possible secondary resource for REEs, but very little information is available regarding REE occurrence in biomass or peat derived fly ash. In this paper, fly ash samples from commercial power plants using peat and biomass as fuel were studied for REEs. The average concentration of REEs was 530 ppm, with up to 920 ppm in one fly ash. Five out of seven fly ashes we…
Missiona Ukraina? : messianismi Venäjän toimien oikeuttajana Putinin Oranssia vallankumousta ja Euromaidan-protestia käsittelevässä retoriikassa
2015
Vuonna 2004 Oranssiksi vallankumoukseksi ja loppuvuodesta 2013 Euromaidaniksi nimettyjen, Ukrainan kansallisen politiikan kriisiin vieneiden prosessien ytimessä oli kysymys valtion tulevaisuuden kansainvälisestä suunnasta joko kohti länttä tai historiaa myötäilevää Venäjää. Vaikka protestit käynnistyivät Ukrainan valtion rajojen sisäpuolella pääkaupunki Kiovan itsenäisyydenaukiolla ja poliittista oppositiota kannattaneiden protestoijien toimesta, niiden aikana Venäjä presidentti Vladimir Putinin johdolla omaksui voimakkaan roolin tapahtumien kulun ohjailijana. Kriisit olivat tuoneet Ukrainan ja Venäjän välisen tiiviin sekä kauas historiaan ulottuvan suhteen risteyskohtaan ja kiinnittääkseen…
Kirjasinetti : Jaakko Yli-Juonikkaan tähänastisen tuotannon poetiikkaa
2018
Lannoitevalmisteiden tuottaminen biojätteistä, puhdistamolietteistä, rejektivesistä sekä lentotuhkista : esimerkkinä Jyväskylän seutu
2012
Tässä tutkimuksessa tarkasteltiin Jyväskylän seudulla muodostuvista jätevedenpuhdistamoiden lietteistä ja rejektivesistä sekä biojätteistä, lannoista ja lentotuhkista tuotettavissa olevia lannoitevalmisteita. Tiedot raaka-aineiden määristä ja ominaisuuksista koottiin pääosin alueellisesta jätteenkäsittely-yhtiöstä, jätevedenkäsittely-yhtiöstä sekä energiayhtiöstä. Osa raaka-aineiden ominaisuuksista arvioitiin kirjallisuusarvojen perusteella tai määritettiin laskennallisesti. Jätevedenpuhdistamoiden lietteiden sekä biojätteiden ja lantojen tuotteistamismenetelmiksi valittiin anaerobinen hajotus sekä kompostointi ja terminen kuivaus. Rejektivesien ammoniumtypen talteenotossa vertailtiin strip…
The determination of antimony and arsenic concentrations in fly ash by hydride generation inductively coupled plasma optical emission spectrometry (H…
2011
Hydride generation inductively coupled plasma optical emission spectrometry (HG-ICP-OES) was used in the determination of As and Sb concentrations in fly ash samples. The effect of sample pre-treatment reagents and measurement parameters used for hydride generation was evaluated. Due to memory effects observed, the appropriate read delay time was adjusted to 60 s resulting in RSDs 0.6% and 2.3% for As and Sb, respectively. The most suitable volumes of pre-reduction reagents for 10 mL of sample were 4 mL of KI/ascorbic acid (5%) and 6 mL of HCl (conc.). The determination of Sb was significantly interfered by HF, but the interference could be eliminated by adding 2 mL of saturated boric acid …
Control of matrix interferences by multiple linear regression models in the determination of arsenic and lead concentrations in fly ashes by inductiv…
2010
A multiple linear regression technique was used to evaluate and correct the matrix interferences in the determination of As and Pb concentrations in fly ashes by inductively coupled plasma optical emission spectrometry. The direct determination of As and Pb in SRM 1633b by ICP-OES failed to obtain the certified concentrations, except in a couple of cases. However, it proved possible to use the multiple linear regression (MLR) technique to correct the determined concentrations to a satisfactory level. This method of correction is based on the multiple regression line obtained from the analysis of 19 synthetic mixtures of matrix and analyte elements (Al, As, Ca, Fe, Pb, and Si) at five concen…
The Grinders : Making Meaning in the Online and Offline Lives of Internet Poker Players
2015
Problem gambling affects only 1–3 percent of the gambling population but still most research on gambling is problem-oriented (Raento 2011, 76). Thus, the negative “cover story” (Gubrium 2008, 512) of gambling needs to be unsettled and complemented, because it obscures the complexities of the lived reality of mainstream gambling culture (Reith & Dobbie 2011; Matilainen & Raento 2014, 433; Jouhki 2011a, 79). Most gamblers are not the marginalized, addicted persons so often envisioned in both research and the media (Vuorento 2011; Binde 2007, 152–157): the mainstream of gambling is about entertainment, excitement, mental challenge and social value. To some it is also a profession. This article…