Search results for "SUT"

Taikojen väkevät ainekset : tutkielma väestä ja sen ilmenemisestä esineissä ja materiaaleissa vanhassa pohjois-suomalaisessa taikaperinteessä

2009

Sources of nitrous oxide and the fate of mineral nitrogen in subarctic permafrost peat soils

2022

Nitrous oxide (N2O) emissions from permafrost-affected terrestrial ecosystems have received little attention, largely because they have been thought to be negligible. Recent studies, however, have shown that there are habitats in the subarctic tundra emitting N2O at high rates, such as bare peat (BP) surfaces on permafrost peatlands. Nevertheless, the processes behind N2O production in these high-emission habitats are poorly understood. In this study, we established an in situ 15N-labeling experiment with two main objectives: (1) to partition the microbial sources of N2O emitted from BP surfaces on permafrost peatlands and (2) to study the fate of ammonium and nitrate in these soils and in …

Places of Belonging, Places of Detachment:

2022

This chapter contributes to the ongoing discussion about rural belonging by considering the role of historical consciousness (Rüsen, 2004) in the process of belonging in a place. The chapter suggests that young people’s temporal orientation in relation to local culture and history plays a significant role in their commitment to rural communities. The analysis draws on qualitative longitudinal data from Finnish girls, aged 16–19, from two sparsely populated regions (Central Finland and the Northern Finnish Sámi homeland). The chapter shows how multiple strands of commitment tie rural young people to their local surroundings, where the past is present in the landscape and everyday life in a m…

Experimental evidence on microwave induced electron losses from ECRIS plasma

2018

The balance between warm and hot (>1 keV) electron density and their losses from the magnetic confinement system of an Electron Cyclotron Resonance Ion Source (ECRIS) plasma is considered to be one of the main factors determining the rate of the high charge state ion production. One of the key loss channels for heated electrons is thought to be induced by the injected microwaves. While this loss mechanism, referred to as rf-induced pitch angle scattering, has been studied theoretically and with computational tools, direct experimental evidence of its significance in minimum-B ECRIS plasmas remains limited. In this work, experimental evidence of microwave induced electron losses in the axial…

Influence of axial mirror ratios on the kinetic instability threshold in electron cyclotron resonance ion source plasma

2022

International audience; Electron Cyclotron Resonance (ECR) ion source plasmas are prone to kinetic instabilities. The onset of the instabilities manifests as emission of microwaves, bursts of electrons expelled from the plasma volume, and the collapse of the extracted highly charged ion (HCI) currents. Consequently, the instabilities limit the HCI performance of ECR ion sources by limiting the parameter space available for ion source optimization. Previous studies have shown that the transition from stable to unstable plasma regime is strongly influenced by the magnetic field structure, especially the minimum field value inside the magnetic trap (Bmin). This work focuses to study the role o…

Vesihuolto osana perusrakennetta : haja-asutusalueiden vesihuollon maksuhalukkuustarkastelu

1999

Modeling biomass char gasification kinetics for improving prediction of carbon conversion in a fluidized bed gasifier

2014

Gasification of biomass in a fluidized bed (FB) was modeled based on kinetic data obtained from previously conducted thermo- gravimetic analysis. The thermogravimetric analysis experiments were designed to closely resemble conditions in a real FB gasifier by using high sample heating rates, in situ devolatilization and gas atmospheres of H 2 O / H 2 and CO 2 / CO mixtures. Several char kinetic models were evaluated based on their ability to predict char conversion based on the thermogravimetric data. A modified version of the random pore model was shown to provide good fitting of the char reactivity and suitability for use in a reactor model. An updated FB reactor model which incorporates t…

Tehtävien ominaisuuksien ja lukutaidon yhteys matematiikan tehtävien ratkaisuprosenttien muutoksiin

2021

Comment on “Androgens and women: COVID‐19 outcomes in women with acne vulgaris, polycystic ovarian syndrome, and hirsutism”

2021

Serum androsterone conjugates differentiate between acne and hirsutism in hyperandrogenic women

1991

Objective To determine if among hyperandrogenic women acne may be differentiated from hirsutism by markers of peripheral androgen metabolism. Design Prospective outpatient study of 36 hyperandrogenic women and controls divided into groups based on the presence or absence of significant hirsutism and the presence or absence of moderate to severe acne. Serum levels of adrenal and ovarian derived androgens were elevated but similar in all patient groups. Interventions Measurement of serum androgens including metabolites of 5 α -reductase activity: 3 α -androstanediol glucuronide and sulfate and androsterone (A) glucuronide and sulfate. Results 3 α -androstanediol glucuronide and sulfate were e…