Ugrasharving i korn

Denne undersøkelsen har som målsetning å finne klarere kriterier om det skal harves, når det skal harves, hvordan harva skal stilles inn og hvilke harvtyper og tindetyper som er optimale på forskjellige jordtyper. Videre skal en se på hvordan underkultur kan tilpasses ugrasharving. Resultatene første år er interessante, men det er for tidlig å trekke konklusjoner

Regenerative Energy Storage System for Space Exploration Missions

This paper describes the development and testing of a 1 kW reversible solid oxide fuel cell intended for energy storage on space exploration missions, particularly for long term Mars exploration. The energy is stored as H2 or CO produced by electrolysis of H2O or CO2. The reactants are then converted back to its original composition by producing electricity. The breadboard was operated for 1250 hours alternating between electrolyser mode and fuel cell mode with H2/H2O as reactants. During the tests, as long as the mechanical integrity of the system was maintained, no degradation effect was observed. At the end of the test period, the fuel cell was operated for three full cycles (approx. 50 hours) with CO/CO2 as reactants. The performance on CO/CO2 was lower than for hydrogen, but sufficient to be used in a compact energy storage system for Mars exploration

Karakterisering av ugrasflora ved start i felta : dyrkingssystemfelt økologisk landbruk

Fra statens plantevern, avdeling ugras

Karakterisering av ugrasflora ved start i felta : dyrkingssystemfelt økologisk landbruk

Fra statens plantevern, avdeling ugras

The influence of Fe2O3 reagent grade purity on the electrical properties of ‘undoped’ LaFeO3 ceramics: a cautionary reminder

Low levels of impurities can have a dramatic influence on the electrical properties of metal oxides. Here, we use a combination of impedance spectroscopy and Seebeck coefficient measurements to show the defect chemistry and p-type conduction mechanism in undoped LaFeO3(LF) ceramics is significantly influenced by impurities in Fe2O3 reagents. A low but significant concentration of impurities associated with 99.9% Fe2O3 reagent is sufficient to compete against the intrinsic Schottky disorder responsible for the p-type behaviour normally observed for undoped LF ceramics. This produces electrically heterogeneous grain (bulk) responses that are strongly dependent on the processing conditions. To achieve electrically homogeneous bulk responses requires adjustment of the oxygen content by annealing in a reducing atmosphere (n-type) or via doping with a significant level of acceptors (mixed ionic/ p-type electronic). These results illustrate the importance of using high purity reagents when studying the electrical properties of ferrite-based perovskites

Biologisk veiledningsprøving 2019. Ugrasmidler

I denne rapporten presenteres resultater fra biologisk veiledningsprøving av ugrasmidler i grasfrøeng, vår- og høstkorn, potet, blomkål, gulrot under plast og på friland, pastinakk, rotpersille, bønne og jordbær, samt en test av avdriftreduserende dyser.publishedVersio