Anbefaling på valg av standarder/rammeverk for velferdsteknologi

Velferdsteknologi kan gi mange, uansett alder, mulighet for å bo hjemme under trygge forhold dersom man blir syk, behøver omsorg eller bare ønsker mulighet til å bo hjemme i en sen fase i livet

Screening for genetic markers to assess potential genetic impact from salmon ranching on wild stocks

Genetic markers are needed to assess the potential genetic impact on wild salmon populations from ocean ranching. In 1990 spawners from four Norwegian rivers: Lone, Vosso, Dale and Onarheim were screened for genetic variability in isozymes and genomic DNA. Variability was detected in LDH, MDH, MEP, IDDH, and with single locus probes (SLP's) in DNA fingerprint analysis. Sibling groups with the observed variability in isozymes are kept separate for further studies on the suitability of the observed variants as genetic markers. Tests of growth rates and survival on different genotypes are being conducted. Groups of genetically marked salmon will be released to study the potential impact on wild populations from ocean ranching and enhancement activities

Anbefaling på valg av standarder/rammeverk for velferdsteknologi

Velferdsteknologi kan gi mange, uansett alder, mulighet for å bo hjemme under trygge forhold dersom man blir syk, behøver omsorg eller bare ønsker mulighet til å bo hjemme i en sen fase i livet

Genetic screening of farmed Atlantic salmon escapees demonstrates that triploid fish display reduced migration to freshwater

Each year, hundreds of thousands of farmed Atlantic salmon escape from fish farms into the wild. Some of these escapees enter freshwater, and manage to interbreed with native populations. To hinder further genetic introgression in native populations, the use of sterile triploid salmon within commercial aquaculture is being examined. However, if triploid escapees migrate into freshwater, they may still have ecological impacts on local populations. In the present study, we used microsatellite DNA genotyping to determine the ploidy of 3794 farmed escapees captured in 17 Norwegian rivers in the period 2007–2014. Although a previous study has reported an average of 2 % triploids in Norwegian fish farms during this exact period, here, we only observed 7 (0.18 %) triploids among the escapees captured in freshwater. In addition, we identified three trisomic escapees. For the triploids where the within-river capture location was determined, they were only observed in the lower reaches and not on the spawning grounds. It is concluded that propensity for triploid Atlantic salmon to migrate into freshwater following escape from a fish farm is significantly lower than for normal diploid salmon escapees. Therefore, commercial production of triploids should not only be seen as an effective way of stopping genetic introgression, it will also significantly reduce the numbers of escapees entering rivers, which in turn limits ecological interactions and potential disease transmission

Energy spectrum of charged pions from K- captures in CF3Br

From about 30 000 stopped K- mesons in the Ecole Polytechnique bubble chamber filled with CF3Br, a search has been made for long-range π- mesons due to the reaction K- + Br → → ΛBr + π-, in an attempt to determine a lower limit of the Λ binding energy in ΛBr. No event compatible with this reaction has been found. Results from measurements of the total π- and π+ energy spectra have been used to investigate the production and trapping of Λ hyperons in K- captures on complex nuclei. From the frequency of Λ production associated with the emission of π- mesons with kinetic energy > 110 MeV, the fraction of directly produced Λ hyperons being trapped in the production nuclei was estimated as 0.29-0.07+0.15. For Λ hyperons due to Σ conversion a lower limit for the same quantity is 0.28 ± 0.05. © 1966 North-Holland Publishing Co. Amsterdam.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

A comparison of methods for denoising of well test pressure data

Abstract Pressure transient data from downhole gauges are one of the key parameters in characterizing reservoir properties and forecasting future reservoir performance. Reservoir pressure is usually measured under dynamic changes. The collected data usually contain different levels of noise, particularly due to imperfections in measuring instruments and imperfect calibrations. The latter is due to changes between the laboratory environment and reservoir conditions. To have accurate descriptions of reservoir, it is essential to smooth the pressure data. Most related studies have employed the wavelet transform to reduce noise. However, there appears to be little research addressing the use of other smoothing techniques for pressure transient data. This paper, therefore, evaluates and compares the performance of three types of smoothing and noise removal methods, namely wavelet transform as a widely used filtering technique, regression-based smoothers, and autoregressive smoothing methods to reduce artificial noise added to simulated dual-porosity pressure data. Particularly, noise is more pronounced in pressure derivative, and so denoising of pressure derivative requires more effective tools. The effectiveness of the noise removing methods was compared using mean square error. The results show that the regression-based methods lead to the same or even better reduction in the noise level as compared to the wavelet domain filter, while the employed autoregressive method results in a moderate performance. We also test the performance of various combinations of the different smoothing methods to filter the same noisy data. It is shown that the combined locally weighted scatterplot smooth (LOESS) and autoregressive moving average (ARMA) gives the best smoothing performance for pressure derivative data. Application of the combined LOESS–ARMA to real field data shows promising results