Experiences With cable faults located at metallic screen connections

Overheating of metallic ground screen connections at accessories of single core cables are the root cause of severe insulation failures in the distribution network. The overheating is due to a high transition resistance of the connections combined with high induced currents in the ground screens during operation. For copper screened cables equipped with a metallic laminate, overheating causing failures are also observed randomly along the cables often at locations close to cable straps or cleats. Currently there are no international standards with complete tests to determine the ampacity of ground screen connections for different cable system designs making future installations more reliable. Furthermore, product information from the suppliers indicates that basis for design and test criteria is not uniform, and tests are not performed concerning relevant operation and fault scenarios. A research project is launched in Norway, to test different ground screen connections and then to provide guidelines to ensure proper future installations. A new CIRED working group is proposed to provide recommendations for complete tests of ground screen connections lacking in current international standards and brochures.publishedVersio

The Atlantic salmon genome provides insights into rediploidization

The whole-genome duplication 80 million years ago of the common ancestor of salmonids (salmonid-specific fourth vertebrate whole-genome duplication, Ss4R) provides unique opportunities to learn about the evolutionary fate of a duplicated vertebrate genome in 70 extant lineages. Here we present a high-quality genome assembly for Atlantic salmon (Salmo salar), and show that large genomic reorganizations, coinciding with bursts of transposon-mediated repeat expansions, were crucial for the post-Ss4R rediploidization process. Comparisons of duplicate gene expression patterns across a wide range of tissues with orthologous genes from a pre-Ss4R outgroup unexpectedly demonstrate far more instances of neofunctionalization than subfunctionalization. Surprisingly, we find that genes that were retained as duplicates after the teleost-specific whole-genome duplication 320 million years ago were not more likely to be retained after the Ss4R, and that the duplicate retention was not influenced to a great extent by the nature of the predicted protein interactions of the gene products. Finally, we demonstrate that the Atlantic salmon assembly can serve as a reference sequence for the study of other salmonids for a range of purposes.publishedVersio

Vitaminer i husdyrernæringen : kompendium til forelesninger ved NLH

Opprinnelig skrevet 1957, redivert 1962 og 1977, delvis revidert 1991. Utgitt ved Landbruksbokhandele

Vitaminer i husdyrernæringen : kompendium til forelesninger ved NLH

Opprinnelig skrevet 1957, redivert 1962 og 1977, delvis revidert 1991. Utgitt ved Landbruksbokhandele

Norsk landbruksforskning : ekstra vitamintilskudd til handelsfôrblandinger for høns

Inneholder flere artiklerEffekten av ekstra tilsetning av fettløselige og/ eller vannløselige vitaminer til kommersielle fôrblandiner til høns ble undersøkt i to forsøk. Det ene omfattet bare verpeperioden, mens det andre omfattet både oppals- og verpeperioden. Det ble ikke funnet signifikante utslag i vektøkning, eggproduksjon, fôrutnyttelse, eggkvalitet, rugeresultater eller helsetilstanden. Resultatene tyder derfor ikke på at det er behov for ekstra tilskudd av vitaminer til de kommersielle forblandingene som ble brukt i denne undersøkelsen. Disse blandingene inneholdt imidlertid noe mer vitaminer enn forutsatt

Norsk landbruksforskning : ekstra vitamintilskudd til handelsfôrblandinger for høns

Effekten av ekstra tilsetning av fettløselige og/ eller vannløselige vitaminer til kommersielle fôrblandiner til høns ble undersøkt i to forsøk. Det ene omfattet bare verpeperioden, mens det andre omfattet både oppals- og verpeperioden. Det ble ikke funnet signifikante utslag i vektøkning, eggproduksjon, fôrutnyttelse, eggkvalitet, rugeresultater eller helsetilstanden. Resultatene tyder derfor ikke på at det er behov for ekstra tilskudd av vitaminer til de kommersielle forblandingene som ble brukt i denne undersøkelsen. Disse blandingene inneholdt imidlertid noe mer vitaminer enn forutsatt

Experiences With cable faults located at metallic screen connections

Overheating of metallic ground screen connections at accessories of single core cables are the root cause of severe insulation failures in the distribution network. The overheating is due to a high transition resistance of the connections combined with high induced currents in the ground screens during operation. For copper screened cables equipped with a metallic laminate, overheating causing failures are also observed randomly along the cables often at locations close to cable straps or cleats. Currently there are no international standards with complete tests to determine the ampacity of ground screen connections for different cable system designs making future installations more reliable. Furthermore, product information from the suppliers indicates that basis for design and test criteria is not uniform, and tests are not performed concerning relevant operation and fault scenarios. A research project is launched in Norway, to test different ground screen connections and then to provide guidelines to ensure proper future installations. A new CIRED working group is proposed to provide recommendations for complete tests of ground screen connections lacking in current international standards and brochures