Wideband Characteristic Basis Functions in Radiation Problems

In this paper, the use of characteristic basis function (CBF) method, augmented by the application of asymptotic waveform evaluation (AWE) technique is analyzed in the context of the application to radiation problems. Both conventional and wideband CBFs are applied to the analysis of wire and planar antennas

Forhold for overlevelse av Gyrodactylus salaris i Oslofjorden

Prosjektleder: André StaalstrømI denne rapporten har modellkjøringer med FjordOs-modellen blitt kalibrert mot målinger av saltholdighet i overflatelaget i Oslofjorden. Disse modellresultatene er brukt for å vurdere muligheten for at vandrende laks kan overføre parasitten Gyrodactylus salaris fra elv til elv via sjøen. Det er en mulighet for G.salaris kan overføres fra Drammenselva til Aulivassdraget, selv om sannsynligheten for at dette skjer er liten. I en ekstrem flomsituasjon i fjordsystemet slik som den i juni 1995, vil det være stor sannsynlighet for at parasitter ville overleve på fisk hvis de hadde vandret mellom Glomma og Aulivassdraget, eller motsatt.Vestfold og Telemark fylkeskommunepublishedVersio

Recolonization and recovery of an Arctic benthic community subject to mine-tailings deposits

Deposition of large volumes of mine tailings takes place in several Norwegian fjords, but the impacts on marine ecosystems have received relatively little scientific attention. At a 40 + − year old tailing deposition area for a copper mine in the Arctic fjord Repparfjorden, we investigated both short-term colonization of mine tailingscontaminated sediments through a field experiment, and the present faunal state in the old deposit area. Copper-concentrations at the old deposition site were still high (up to 291 mg/kg dry weight (dw)), and exceeded the Norwegian environmental-quality threshold (84 mg/kg dw). Furthermore, copper was identified as a significant structuring factor for the fauna in the fjord, although faunal diversity was relatively high and the community not severely disturbed. In the colonization experiment, experimental boxes filled with defaunated sediment capped with mine tailings were subject to colonization for 15 months. Benthic macrofaunal communities were successfully established in all boxes, but the boxes with tailings showed lower species richness, abundance and biomass than the controls. Mine tailings continue to have local impacts on seafloor communities decades after deposition, and even low levels of metal-rich sediments can affect faunal recruitment. These results have implications for submarine deposition of mining waste and the impacts they have on coastal ecosystems

Health and environmental impacts in the Norwegian border area related to local Russian industrial emissions. Knowledge status.

© NILU – Norsk institutt for luftforskning. Publikasjonen kan siteres fritt med kildeangivelse.The contaminant situation in the Norwegian-Russian border has caused concern for several decades and considerable amount of data has been gathered during the Pasvik programme (Stebel et al., 2007; Pasvik programme, 2008) for the environmental pollution, but not in this extent for food safety and potential human health risks in this region. Through the compiling of the available literature the authors of this report have identified a number of issues that need further attention

Environmental and production survey methodology to estimate severity and extent of aquaculture impact in three areas of the Philippines

The project “Environmental Monitoring and Modelling of Aquaculture in the Philippines” known as EMMA, was undertaken by the National Integrated Fisheries Technology Development Centre (NIFTDC) of the Bureau of Fisheries and Aquatic Resources (BFAR) and Akvaplan-niva AS of Tromsø, Norway. The project was funded by the Norwegian Agency for Development Cooperation (NORAD). This project tested survey equipment for the monitoring of aquaculture impact to the water column and sediment. Baseline surveys were undertaken as the goal of the study was to develop suitable aquaculture monitoring techniques and adapt predictive models to assist in identifying risk areas for aquaculture and allow planned development of sustainable aquaculture. Three different locations were chosen as case studies - Bolinao, Pangasinan (marine site), Dagupan (brackish water site), and Taal Lake (freshwater site). Production surveys were also undertaken to estimate production and nutrient outputs to the water bodies in order to be able to link aquaculture production with severity and extent of impacts. Different methodologies for the estimation of production were tested to find a cost effective and accurate methodology

Evidence of energy and nutrient transfer from invasive pink salmon (Oncorhynchus gorbuscha) spawners to juvenile Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) in northern Norway

Recent large influxes of non-native Pacific pink salmon (Oncorhynchus gorbuscha) to North European rivers have raised concern over their potential negative impacts on native salmonids and recipient ecosystems. The eggs and carcasses of semelparous pink salmon may provide a significant nutrient and energy subsidy to native biota, but this phenomenon has not been widely documented outside the species' native distribution. We analysed the stomach contents and stable isotope values (δ15N and δ13C) in muscle and liver tissues of juvenile Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) to determine whether these native salmonids utilise marine-derived nutrients and energy provided by pink salmon eggs and carcasses in the subarctic river system Vesterelva, northern Norway. Although egg foraging and assimilation of marine-derived nutrients in fish body tissues were found to be minor at the population level, a few juvenile salmon and trout had recently eaten large quantities of pink salmon eggs. Some of these individuals also had high δ15N and δ13C values, indicating a long-term diet subsidised by marine-derived nutrients and energy from pink salmon eggs. Hence, our study provides novel evidence that the eggs of invasive pink salmon may provide an energetic, profitable food resource for juvenile native fish. More research is needed to understand the broader ecological implications for fishes and other biota in river ecosystems invaded by pink salmon. egg predation, marine-derived nutrients, non-native salmonids, resource subsidy, stable isotope analysis, subarctic riverpublishedVersio

PENGARUH VARIASI SUHU PERLAKUAN PANAS MENGGUNAKAN GAS HIDROGEN TERHADAP KARAKTERISTIK TERMISTOR NTC BERBASIS Fe2O3-MnO-ZnO

Telah dilakukan pembuatan termistor NTC berbasis Fe2O3-MnO-ZnO dengan perlakuan panas yang suhunya divariasikan antara 200oC, 300oC, 400oC dan 500oC menggunakan gas hidrogen (93%Ar+7%H2). Dimana kandungan yang ada pada mineral yarosit yaitu hematit (Fe2O3) yang menjadi bahan utama termistor NTC. Proses pembuatan tersebut dimulai dengan pencampuran serbuk Fe2O3 (lokal) yang sudah digerus dengan MnO dan ZnO sampai didapatkan pasta berbasis Fe2O3-MnO-ZnO. Kemudian dilakukan proses screen printing pada film tebal mentah. Film tebal tersebut disinter pada suhu sinter 1100°C selama 2 jam. Film tebal hasil sinter dilapisi perak untuk memberikan kontak ohmik sehingga dapat dilakukan pengukuran resistansi. Resistansi film tebal diukur pada suhu 30-150oC dengan beda suhu sebesar 5oC. Film tebal yang telah diukur resistansinya, diberi perlakuan panas dengan memanaskannya pada suhu yang bervariasi di dalam atmosfer gas hidrogen. Setelah diberi perlakuan panas dilakukan kembali pengukuran resistansi. Selanjutnya dilakukan karakterisasi struktur kristal dan struktur mikro dianalisis dengan XRD dan SEM. Struktur kristal yang terbentuk yaitu hematit dan spinel, namun bertambahnya suhu perlakuan panas membuat struktur kristal cenderung amorf dan perlakuan panas yang diberikan tidak mempengaruhi ukuran butir. Hasil karakterisasi sifat listrik menunjukkan resistansi listrik menurun seiring bertambahnya suhu perlakuan panas dari 2537,67MΩ menjadi 3,69MΩ. Termistor yang memenuhi persyaratan pasar (≥2000K) yaitu yang diberi perlakuan panas pada suhu 200oC-400oC. ; NTC thermistor have been fabricated based Fe2O3-MnO-ZnO the heat treatment temperature is varied between 200oC, 300oC, 400oC and 500oC using hydrogen gas (93% Ar + 7% H2). Where the existing content on yarosit mineral is hematite (Fe2O3) which is the main ingredient of NTC thermistors. The creation process begins with the mixing of powders Fe2O3 (local) that have been crushed with MnO and ZnO based paste to obtain Fe2O3-MnO-ZnO. Then do the process of screen printing on thicker films crude. The thick film sintered at 1100°C sinter temperature for 2 hours. Thick film sintered silver coated to provide an ohmic contact resistance measurement so that it can be done. Thick film resistance measured at 30-150oC with a temperature difference of 5°C. Thick film has been measured resistance, heat-treated by heating at various temperatures in the atmosphere of hydrogen gas. After the heat treatment is carried back by resistance measurement. Further characterization of crystal structure and microstructure were analyzed by XRD and SEM. The crystal structure is formed that is hematite and spinel, but increasing the heat treatment temperature makes the crystal structure tend to be amorphous and heat treatment provided does not affect the size of the grains. The characterization results show electrical properties of electric resistance decreases as the heat treatment temperature of 2537.67MΩ be 3.69MΩ. Thermistor that meets the requirements of the market (≥2000K) is heat-treated at a temperature of 200oC-400oC

Screening studies of POP levels in bottom sediments from selected lakes in the Paz watercourse

Appendix 5/15 of the publication "State of the environment in the Norwegian, Finnish and Russian border area 2007" (The Finnish Environment 6/2007)