Search results for "Humin"
showing 10 items of 38 documents
Influence of land use on the characteristics of humic substances in some tropical soils of Nigeria
2005
Summary In highly weathered tropical conditions, soil organic matter is important for soil quality and productivity. We evaluated the effects of deforestation and subsequent arable cropping on the qualitative and quantitative transformation of the humic pool of the soil at three locations in Nigeria. Cultivation reduced the humic pool in the order: acetone-soluble hydrophobic fraction (HE) > humic acid (HA) > humin (HU) > fulvic acid (FA), but not to the same degree at all three sites. The C and N contents, as well as the C/N ratios of humic extracts, were large and not substantially influenced by land use. The δ13C values of the humic extracts were invariably more negative in forested soil…
Ikääntyneet aikuiset kuntoutustyöntekijöiden puheessa : työn kohteesta osallistuvaksi aikuiseksi?
2019
Artikkelissa kuvataan kuntoutustyöntekijöiden puhetta ikääntyneistä aikuisista ryhmämuotoisessa kuntoutuksessa. Aineisto koostuu kuudesta kuntoutustyöntekijöiden moniammatillisesta fokusryhmäkeskustelusta, jotka toteutettiin kuudessa kuntoutuslaitoksessa. Aineisto analysoitiin diskurssianalyysiä hyödyntäen. Kuntoutustyöntekijöiden puheesta tunnistettiin viisi puhetapaa, joista arviointipuhe liittyi sosiaali- ja terveysalan (sote) kontekstiin, ohjaus- ja riskipuhe asiakkaiden oppimisen ja muutoksen kontekstiin sekä toiseus- ja oivalluspuhe työntekijöiden asiantuntijuuteen. Kuntoutuksessa tavoitellusta asiakaslähtöisyyden periaatteesta huolimatta työntekijöiden arviointi-, ohjaus- ja riskipuh…
Participation in sociolinguistic research
2022
Involving speakers in research on their linguistic practices has been at the core of sociolinguistics since the inception of the field. In contrast to social sciences, however, sociolinguists have rarely addressed the issues surrounding the participation of those involved and engaged in the research process. This paper aims at reviewing the state of the art and outlining critical dimensions and aspects with relation to participation. We explore previous studies and study designs with the help of the following questions: Who has been involved? How and with what impact have stakeholders participated in different strands of sociolinguistic research? Current developments are presented and revie…
Brain Source Correlates of Speech Perception and Reading Processes in Children With and Without Reading Difficulties
2022
Neural correlates in reading and speech processing have been addressed extensively in the literature. While reading skills and speech perception have been shown to be associated with each other, their relationship remains debatable. In this study, we investigated reading skills, speech perception, reading, and their correlates with brain source activity in auditory and visual modalities. We used high-density event-related potentials (ERPs), fixation-related potentials (FRPs), and the source reconstruction method. The analysis was conducted on 12–13-year-old schoolchildren who had different reading levels. Brain ERP source indices were computed from frequently repeated Finnish speech stimuli…
Identification of bound alcohols in soil humic acids by gas chromatography-mass spectrometry
2000
International audience; Humic acids are complex, partly macromolecular, yellow-brownish substances occurring in soils, waters and sediments. In order to shed some light on their molecular structure, crop humic acids were cleaved by alkaline hydrolysis (KOH). The products were fractionated by thin layer chromatography to give mono-alcohols which were analysed as acetate derivatives by gas chromatography coupled to mass spectrometry. Linear alcohols, sterols, stanols and plant-derived triterpenoid alcohols were identified by co-injection of pure standards and by comparison with literature data. These findings imply that alcohols could have been incorporated into the humic matrix by esterifica…
Spoken Language Development and the Challenge of Skill Integration
2019
The development of phonological awareness, the knowledge of the structural combinatoriality of a language, has been widely investigated in relation to reading (dis)ability across languages. However, the extent to which knowledge of phonemic units may interact with spoken language organization in (transparent) alphabetical languages has hardly been investigated. The present study examined whether phonemic awareness correlates with coarticulation degree, commonly used as a metric for estimating the size of children's production units. A speech production task was designed to test for developmental differences in intra-syllabic coarticulation degree in 41 German children from 4 to 7 years of a…
L1 listeners’ perception of L2 pronunciation : effect of prosody on accentedness ratings in Swedish
2017
Coherence between brain activation and speech envelope at word and sentence levels showed age-related differences in low frequency bands
2021
Abstract Speech perception is dynamic and shows changes across development. In parallel, functional differences in brain development over time have been well documented and these differences may interact with changes in speech perception during infancy and childhood. Further, there is evidence that the two hemispheres contribute unequally to speech segmentation at the sentence and phonemic levels. To disentangle those contributions, we studied the cortical tracking of various sized units of speech that are crucial for spoken language processing in children (4.7–9.3 years old, N = 34) and adults (N = 19). We measured participants’ magnetoencephalogram (MEG) responses to syllables, words, and…
Keskustelukumppanin kehuminen suomalaisessa keskustelussa
2013
Artikkelissa tarkastellaan suomalaisen arkikeskustelun kehuja kolmen peruskysymyksen kautta: 1) millaisia kehut ovat rakenteeltaan, 2) miten kehut otetaan vastaan ja 3) millaisissa tilanteissa kehuja esitetaan ja mita niilla tehdaan? Tutkimus on metodiltaan keskustelunanalyyttinen: kehuja analysoidaan osana aitojen keskustelujen toiminnallista kudosta. Kehu maaritellaan tutkimuksessa vastaanottajaan tavalla tai toisella kohdistuvaksi myonteiseksi arvioksi. Kehu voi arvioida vastaanottajaa monella tavalla: kehuttavana voi olla esimerkiksi puhekumppanin luonne, hanen toimintansa tietyssa tilanteessa tai vaatetus, hiukset tai asunto. Aineistona on seka nauhoitetuista arkikeskusteluista poimitt…
”Kato, tuo puhhuu suomea!” : sujuvasti äännetty suomi ja yhteiskunnallinen osallisuus
2020
Ääntäminen on puheilmaisun perusta. Sujuvaa ja ymmärrettävää puhetta on helppo kuunnella, se ei ole liian nopeaa tai takeltelevan hidasta, äänteet erottuvat ja puheen sävelkulku on vivahteikas (Valo 1994). Aikuiset suomi toisena kielenä –puhujat ponnistelevat toisinaan sujuvan ääntämisen kanssa pitkään, vaikka heillä olisikin kielen rakenteet ja sanasto hallussaan. Ääntämisen oppimisen prosessi on yhteydessä muun muassa aiempaan oppimiseen ja oppijan yksilöllisiin ominaisuuksiin. Ääntämiseen liittyy myös yhteisöllinen aspekti: miten vierasperäinen ääntäminen edistää tai estää osallistumista ja aktiivista roolia yhteiskunnassa? Pohdin puheenvuorossani aikuisten maahanmuuttajien, erityisesti …