Renewable energy sources (RES), especially wind turbines, have become more important during the last years. An increasing number of distributed generation (DG) units are connected to weak medium voltage distribution networks in rural areas where they have a large influence on the voltage and the line losses. Voltage rise is in this case often a limiting factor for the maximum amount of DG capacity

A simple and intuitive metric of multiplexing efficiency is proposed for evaluating the performance of MIMO antennas in the spatial multiplexing mode of operation. The metric is particularly useful for antenna engineers whose goal is to achieve the optimum antenna system design. Experimental results involving prototype mobile terminals highlight the effectiveness of our proposal.

Reduction of external threats to survival and mitigation of threat perceptions can persuade the state apparatus to gradually desecuritize the internal sphere and allow for a more inclusive and democratic politics to emerge, not least if such an opening promises to consolidate its interests in the long run. The logic applies to all rational actors in the international system that are driven by will

I en studie av neutralisationskapaciteten och kalkstenshalten i Sydvattens infiltrationsområde vid Vomb har fem prover från olika platser i fältet samlats in, siktats och surgjorts med saltsyra. Neutralisationskapaciteten mätt som kalciumkarbonathalt befanns variera i de olika sandproverna men var generellt hög (ca 2–14 % som vikt). Den totala massan av kalciumkarbonat i infiltrationsområdet bestäIn a study of the neutralization capacity and limestone content the artificial recharge area of the Sydvatten waterworks Vombverket in Vomb, Skåne, five samples from different locations in the area was collected, sieved and acidified with hydrochloric acid. The neutralization capacity measured as calcium carbonate content was found to vary in the different sandy soil samples but was generally high

Popular Abstract in Swedish Kassava är ett stärkelserikt livsmedel, jämförbart med potatis. Det produceras främst i jordens tropiska regionerna och är ett viktigt livsmedel i Afrika söder om Sahara. Kassava har stora fördelar som gröda eftersom avkastningen är hög, den har god motståndskraft mot sjukdomar, den växer även på mager jord och den är motståndskraftig mot torka. Emellertid, kassava har Cassava (Manihot esculenta Crantz) is an important and cheap source of carbohydrate in tropical regions, particularly in Sub-Sahara Africa. Cassava as a human food is a good source of energy as it has a comparable high energy density of about 610 kJ/100 g fresh root. The crop has growth advantages and production can take place in soil where other crops such as maize, sorghum and sweet potatoes can

Den inre och yttre vattenomsättningen i sex svenska städer har studerats.Dagvatten från hårda ytor till kombinerade system har beräknats liksomdränering av mark och grundvatten till detta system. Diffus avrinningutanför spill- och dagvattensystem har också beräknats. Inläckage tillspillvattensystem är ganska lika i de sex städerna. Det diffusa flödet tillrecipienter beror på klimatfaktorer.The inner and outer water balance in six Swedish cities has been studied.Direct stormwater contribution to the combined system has beendetermined, as has drainage of soil and groundwater to this system.Diffuse runoff not being in the sewerage or stormwater systems has alsobeen determined. The leakage into the sewerage system is almost thesame in all cities. The diffuse runoff depends on climatic f