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- De Bruijn, Paulien, et al.
(författare)
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Mechanical properties of lime-hemp concrete containing shives and fibres
- 2009
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Ingår i: Biosystems Engineering. - : Elsevier BV. - 1537-5110 .- 1537-5129. ; 103:4, s. 474-479
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Tidskriftsartikel (refereegranskat)abstract
- The effect of using different binding agents in combination with hemp shives and fibres in Lime-Hemp Concrete (LHC) building material was examined. LHC is a light composite building material with building lime as binding agents and hemp (Cannabis sativa) as a renewable raw material from agriculture. Contemporary LHC only uses the woody core part of the hemp, the shive. However, using both hemp shives and fibres may improve the mechanical strength, eliminating the need for a fibre separation process. The aim was to elucidate the feasibility of using the entire fragmented hemp stalk in an LHC, and to determine some important material properties such as compressive strength, splitting tensile strength, water sorption and frost resistance. LHC with varying inclusions of the lime-based binders were tested, as were five mixes using the binding agents hydrated lime, hydraulic lime, and cement. Specimens were cured for 12 weeks at room temperature and 40 days in a carbonation room (4.5 vol% CO2), and tested for mechanical properties, water sorption and frost resistance. Using both shives and fibres in LHC may be advantageous for countries such as Sweden where facilities for separating hemp from shives are not commercially available.
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| 4. |
- Martin Ngwabie, Ngwa, et al.
(författare)
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Gaseous emissions from a fattening piggery and a dairy barn with an automatic milking system
- 2009
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Abstract. The concentrations of CH4, N2O, CO2 and NH3 were measured with a photoacoustic multi-gas analyser 1412 and a multiplexer 1309 (Lumasense Technologies A/S, Ballerup, Denmark) in a piggery over two fattening periods and in a dairy cow barn. The aim was to analyse and compare differences in emissions based on seasonal changes, animal species and management systems. The mechanically ventilated piggery was a slurry-based small scale research facility with a partly slatted floor and daily manure removal with scrapers. It housed 50 and 54 fattening pigs per batch in spring and in autumn, respectively. The dairy cow barn was naturally ventilated and had cubicles and a solid sloping floor with a central urine gutter. The floor was scraped once every hour during the daytime and once every two hours at night. It housed 108 Holstein dairy cows, which were milked automatically. The average milk production was 31.5 kg milk cow-1 day-1. The air flow in the piggery was in the range of 55–103 m3 pig-1 h-1. Emissions in the piggery were 2.3–4.9 g CH4 LU-1 h-1 and 1.3–1.6 g NH3 LU-1 h-1 and were influenced by seasonal changes (1 LU = 500 kg animal weight). The air flow in the dairy cow barn was calculated using CO2 mass balance and corrected for cow activity. The average daily air flow was 268–917 m3 LU-1 h-1 with a mean of 524 m3 LU-1 h-1. Emissions in the dairy cow barn were 10.9 g CH4 LU-1 h-1 and 0.82 g NH3 LU-1 h-1. Cow activity correlated with CH4 (R2 = 0.91) and NH3 (R2 = 0.56) emissions, where R2 is the coefficient of determination. Emissions in the dairy cow barn were influenced more by the activity of the cows rather than the ventilation rate, indicating a useful mitigation parameter. Keywords. Livestock buildings, animal activity, ventilation rate, ammonia, greenhouse gases
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| 5. |
- Martin Ngwabie, Ngwa, et al.
(författare)
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Multi-location measurements of greenhouse gases and emission rates of methane and ammonia from a naturally-ventilated barn for dairy cows
- 2009
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Ingår i: Biosystems Engineering. - : Elsevier BV. - 1537-5110 .- 1537-5129. ; 103, s. 68-77
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Tidskriftsartikel (refereegranskat)abstract
- The building had 164-195 Holstein dairy cows. The milk production was 31-33 kg cow(-1)d(-1). Manure gutters beneath the partially slatted floor in the building were scraped twice a day. Measurements took place during the winter when the cows were permanently indoors and during 1 week in the spring when the cows were indoors at night and outside grazing during the daytime. The indoor concentrations were measured at nine evenly distributed locations, while outdoor concentrations were measured at two locations. The mean ventilation rate in winter was 250-26S m(3) LU(-1) h(-1) and in spring, it was 401 m(3) LU(-1) h(-1). The emissions of NH3 and CH(4) were in the range of 0.89-1.13 and 9-13 g LU-1 h-1, respectively. A strong positive correlation was found between enhanced CO(2) and CH(4) concentrations. (C) 2009 IAgrE. Published by Elsevier Ltd. All rights reserved.
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| 6. |
- Meiner, Mie, et al.
(författare)
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Byggnader och inhysningssystem för lammproduktion
- 2009
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- I den här rapporten kombineras erfarenheter från studiebesök på gårdar i såväl Sverige som utomlands, med uppgifter från svensk och internationell litteratur som berör inhysning av får. Författarna har gjort studiebesök på 16 svenska gårdar, och dessutom studieresor till Danmark, Norge, Finland och USA. Avsikten är att ge en så heltäckande bild som möjligt av de inhysningsmöjligheter som förekommer, och som skulle vara möjliga i en rationell svensk fårproduktion. Rapporten behandlar produktionsformer, inredning, utrustning och planlösningar samt byggnadens utformning.
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| 8. |
- Olsson, Anne-Charlotte, et al.
(författare)
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Grisproduktion kräver helhetssyn
- 2009
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Ingår i: Helsingborgs dagblad. - 1103-9388.
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Tidskriftsartikel (populärvet., debatt m.m.)
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