29 uppsatser · sida 1 av 2
En studie av ureasönderfall under kvävgasatmosfär
The purpose of this work was to provide a better understanding of urea’s decomposition and byproduct formation in an SCR system on heavy trucks. In my experimental setup with TGA-DSC-FTIR (a combination of two thermal analysis methods and a method for gas phase detection), an …
The aim of this thesis is to improve the control of urea injection at the combined power and heating plant Framtidens Gärstad (FTG). Tekniska Verken i Linköping AB is the owner of the plant. The FTG plant consists of a boiler where garbage combustion is done. From the combustion …
The purpose of this study was to examine whether urea could be an option as a nitrogen source for young cattle, the study was limited to risks related to feeding, growth and feed efficiency. Microbes in ruminants have the ability to convert nitrogen to protein, this has been …
… (L.) Karst.). Previously studies show that stump treatment with Rotstop® S and urea gives effective protection against Heterobasidion annosum in stands with mainly spruce. The Forestry in Sweden is today very dependent on tree species as Norway spruce and Scots pine (Pinus …
… was to in small scale evaluate the sanitation in a combined liquid compost and urea treatment by monitor the inactivation of bacteria and viruses at the combination three start temperatures, 45, 40 and 35 °C, and three additions of urea, 0.5, 0.75 and 1 % and reference, 0 % urea …
The aim of this literature study was to analyze how milk urea concentration is working as a measure of the nitrogen supply to rumen microbes and indicator of the environmental load. Questions included in this literature study were how to improve the dairy cattle nitrogen …
The aim of this literature study was to analyze how milk urea concentration is working as a measure of the nitrogen supply to rumen microbes and indicator of the environmental load. Questions included in this literature study were how to improve the dairy cattle nitrogen …
Luleå flygplats
På Luleå Flygplats används urea som halkbekämpningsmedel eftersom det löser upp isbeläggningar genom att sänka vattnets fryspunkt. Urea finns naturligt i vattendrag och jordar som ett resultat av exkretion och nedbrytning i form av nukleinsyror och proteiner. Halterna är …
… aim of this study was to in laboratory experiments investigate how addition of urea, ECOX and structural materials can optimize sanitization during composting of sewage sludge. Today we strive for a sustainable society and the importance of closing the nutrient loop increases …
… lower pH, it is ionised, NH4 +, and constitutes an important plant nutrient. Urea is the world’s most essential fertilizer and when in contact with the enzyme urease it decomposes into ammonia. The addition of ammonia or urea increase the sludge’s value as a fertilizer, because …
… used 4 male Yellow cattle which were fed a basal diet added with either of Urea, Urea + Sulfur, Nitrate or Nitrate + Sulfur in a Latin square design. There was a significant lower ratio of CH4/CO2 with the treatment of Nitrate + Sulfur compared with the treatment of Urea which …
… balance. ?-hydroxybutyrate (BHB), acetone, nonesterified fatty acids (NEFA), urea and glucose are metabolites that have been found to have connections to the energy status of the cow. BHB, NEFA and urea also is related to fertility. There are also some hormones that have been …
… med SCR-system. Ett SCR-system fungerar på det sättet att man sprutar in urea i avgaserna vilket omvandlas till ammoniak som i den efterföljande katalysatorn reagerar med kväveoxiderna och bildar oreglerade ämnen. För att få hög omvandlingsgrad av kväveoxiderna i katalysatorn är …
… different nitrogen fertilizers, calcium tetrahydrate, ammoniumnitrate and urea were compared in two different levels corresponding 60 N kg/ha and 120 N kg/ha with an unfertilized control. It is considered that there is no way to fight the pathogen but the results in this …
… sopning, borstning med stålborstar och användning av isbekämpningsmedel som Urea. Det är en väldigt kostsam verksamhet och även miljöbelastande då Urea har en gödande effekt på sin omgivning. Det här examensarbetet undersöker ett alternativt sätt att hålla banan fri från snö och …
