Search results for "öljy"

Analysis of Lipophilic Extractives from Fast Pyrolysis Bio-Oils

2022

Fast pyrolysis bio-oils (FPBOs) originating from forest residues contain extractive-derived substances, which may form a separate, sticky layer with char particles on the surface of these bio-oils. In this study, first, the removal of extractive-derived substances from the bio-oil top phase was studied by common solvents with different polarities. In this case, the results indicated that when aimed at the maximum yield of single-phase fuel oil and thus the maximum amount of extractives removed, the use of n-heptane or n-hexane seems to be of benefit for this purpose. For safety reasons, the use of n-heptane was recommended. Second, an analysis practice (extraction time and the way of mixing…

Luonnontieteellisin analyysimenetelmin tunnistettu Akseli Gallen-Kallelan väripaletti

2020

Artikkeli on kokonaisuudessaan ensimmäinen laatuaan Suomessa ja se esittelee tutkimuksen tuloksia koskien Akseli Gallen-Kallelan käyttämiä väriaineita. Tutkimusaineisto on läpileikkaus taiteilijan taiteellisesta tuotannosta vuosilta 1880–1929.  Se koostuu 265:stä maalauksesta ja 83:sta öljy- ja temperavärituubista. Tutkimuksessa käytetyt analyysimentelmät ovat ainetta tuhoamattomia luonnontieteellisiä analyysimenetelmiä: energiadispersiivinen röntgenfluoresenssi spektroskopia (EDXRF) ja polarisaatiomikroskopia (PLM).
  
 Avainsanat: Akseli Gallen-Kallela, taiteilijatarvike, väriaine, pigmentti, taiteen materiaalitutkimus, EDXRF, polarisaatiomikroskopia.

Observations on the Painting Technique and Materials Used in the Painting of Lake View, by Akseli Gallen-Kallela

2021

Development of analysis method for determination of mineral oil contamination in cardboard

2016

ABSTRACT Since mineral oil contamination from food packaging to food has become a public health concern, several laboratories are investigating possibilities to develop a simply and affordable analytical method for measuring mineral oil saturated hydrocarbons (MOSH) and mineral oil aromatic hydrocarbons (MOAH) in cardboard. The present study investigated on the behalf of Metsä Board Oy (Finland) an efficient analytical method for the determination of mineral oil in cardboard by using cardboard extraction (sample separation), a solid phase extraction (SPE) process (purification) and gas chromatography-flame ionization (GC-FID) (mineral oil quantitation). Also, mass spectrometry (MS) was used…

Raakaöljymarkkinoiden rakennemuutokset ja futuurimarkkinoiden tehokkuus

2017

Tutkimuksessa tutkittiin raakaöljymarkkinoiden rakennemuutoksia ja futuurimarkkinoiden tehokkuutta ja pyrittiin selvittämään, ovatko raakaöljyn futuurimarkkinat tehokkaat, onko raakaöljymarkkinoilla havaittavia rakennemuutoksia ja onko raakaöljymarkkinoiden rakennemuutoksilla vaikutusta futuurimarkkinoiden tehokkuuteen. Aineistona käytettiin Brent- ja WTI-raakaöljylaatujen spot- ja futuurihintasarjoja ajanjaksolta 24.6.1988 – 19.1.2017. Rakennemuutosta tutkittiin Zivot-Andrews –testillä ja futuurimarkkinoiden tehokkuutta lineaarisella regressiolla sekä GJR-tyyppisellä epäsymmetrisyysmuuttujalla täydennetyllä GARCH-in-Mean –mallilla. Havaitut rakennemuutokset ajoittuivat WTI:n spot- ja futuu…

Mass spectrometric analysis of heavy and base oils

2018

Base oil production from crude oil has become more complex as demanded product properties, yield objective and field competition have increased interest in research towards high viscosity index (VI) base oils. Conventional lubricant grade base oil enjoyed biggest market share until 2000-2004 but now high VHVI product demands have introduced also novel production methods for heavy-type base oils such as Ficsher-Tropsch method based gas-to-liquid (GTL) and poly-internal-olefin (PIO) base oils. In this MSc, different mass spectrometric methods for heavy and base oils where compared and in-house field ionization method was characterized and method validation was begun. Base oil mass analytics u…

Rypsiöljyn metyyliesterin paikallinen valmistus ja käyttö

2006

Does corn market uncertainty impact the US ethanol prices?

2018

The growing interest in biofuel as a green energy source has intensified the linkages between corn and ethanol markets, especially in the United States that represents the largest producing and exporting country for ethanol in the world. In this study, we examine the effect of corn market uncertainty on the price changes of US ethanol applying a set of GARCH-jump models. We find that the US ethanol price changes react positively to the corn market volatility shocks after controlling for the effect of oil price uncertainty. In addition, we document that the impact of corn price volatility on the US ethanol prices appears to be asymmetric. Specifically, only the positive corn market volatilit…

Öljyhiilivedyillä pilaantuneen maa-aineksen kompostoinnin tehostaminen

2009

Can foliar-applied nutrients improve caraway (Carum carvi L.) seed oil composition?

2021

Caraway seeds contain between 0.5–7% essential oil, rich in monoterpenes that have a characteristic aroma and chemical properties. Caraway oil has several bioactive compounds that are of industrial importance, particularly for pharmaceutical and health care products. Carvone and limonene are the main terpenes present in caraway oil, which along with some unique fatty acids (i.e. petroselinic acid) determine caraway (Carum carvi L.) oil quality. Both terpenes are important raw materials for industrial applications and their concentration influences the price of caraway seed and oil, hence there is need for identifying management practices that may increase the concentration of these and othe…