Search results for "öljy"
showing 3 items of 23 documents
Kolmivaiheisen pyrolyysiprosessin mallintaminen
2015
Työssä rakennetun mallin avulla määritettiin kolmivaiheisen hitaan pyrolyysiprosessin massa- ja energiavirrat. Mallissa reaktoriin syötettiin 2 kg tuoretta mäntyä, josta kuivausvaiheen jälkeen saatiin tuotteena 1 kg kuivaa puuta. Lämpötilassa 260 °C suoritetun torrefioinnin kiintosaanto oli 0,84 kg torrefiointiöljyn 0,13 kg ja kaasujen 0,04 kg. Hapan torrefiointiöljy sekä torrefiointikaasut johdettiin ulos prosessista ja torrefioitu puu pyrolysoitiin 450 °C:ssa, jolloin muodostui biohiiltä 0,28 kg, pyrolyysiöljyä 0,35 kg ja pyrolyysikaasuja 0,37 kg kiloa torrefioitua puuta kohti. Kuivausvaihe kulutti energiaa 3260 kJ/kg-tuore puu ja torrefiointi 619 kJ/kg-kuiva puu. Pyrolyysivaihe sen sijaa…
The Extractive Industries Transparency Initiative (EITI) in Cameroon : realities and prospects
2010
For a long time, Cameroon was a success story in the context of Africa’s development. Unfortunately, the economic crises of the eighties and early nineties led to the failure of the development strategies that had been pursued until then, resulting in a severe deterioration of the country’s economy and the living standards of the Cameroonian people (Mentan, 2003). However, this country possesses significant oil wealth which if properly managed can generate abundant revenue to boost economic growth and fund anti-poverty measures. In 2005, Cameroon adhered to the Extractive Industries Transparency Initiative (EITI). A proper implementation of this initiative will improve transparency in the c…
Indian Yellow and Titanium White : A Material-centred Perspective on the Pigments Used by Artists Helene Schjerfbeck and Akseli Gallen-Kallela in the…
2022
This article presents the results of material studies focused on identifying and comparing the contents of the pigment palettes of two notable Finnish painters, Helene Schjerfbeck (1862–1946) and Akseli Gallen-Kallela (1865–1931). The research methods used comprise energydispersive X-ray fluorescence spectrometry (EDXRF) and polarised light microscopy (PLM). In addition, certain pigments have been identified in colour areas of the works using specular reflection FT-infrared spectrometry (FTIR) and Raman spectrometry. To support the results gathered using scientific analytical methods, archival research has been conducted in order to find notes and references to the pigments made by the arti…