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- Juhlin, Jessica
(author)
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Factors associated with spontaneous oxidized flavour in cow´s milk
- 2010
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Doctoral thesis (other academic/artistic)abstract
- Spontaneous oxidized flavour (SOF) is an off-flavour in milk that has received attention in only a few countries, primarily due to lack of monitoring. The poly unsaturated fatty acids in milk are considered to make it more prone to oxidize, with effects like shorter shelf life of dairy products and a reduction in consumer acceptance of milk. On the other hand, unsaturated fatty acids have a reputation of being healthier than the saturated fatty acids. Means to optimize the fatty acid composition of milk include breeding measures, why acyl-CoA:diacylglycerol acyltransferase1 (DGAT1), a major gene for milk fat content, has lately attracted a lot of research efforts. The risk of milk to develop SOF showed a strong and positive association with milk concentrations of both the well known prooxidant copper and its substrate the poly unsaturated milk fatty acids. The observed statistical interaction between copper and fatty acid composition suggests that SOF will not develop as easily in milk with high copper content unless sufficient amounts of substrate is available to promote the oxidation process. Breed and selection for fat content had an effect on the composition of milk fat where milk from Swedish Holstein cows generally had larger amounts of poly unsaturated fatty acids compared to the Swedish Red cows in the two selection lines in the SLU research herd. Selection for high milk fat content was associated with lower concentration of conjugated linoleic acid (CLA). The selection for fat content created differences in allele frequencies of the DGAT1 gene between selection lines, with a higher frequency of the 232A allele within the low fat line. DGAT1 genotype was associated with both composition of milk fat and occurrence of SOF, with the A allele being associated with a higher proportion of the polyunsaturated fatty acid CLA and an increased susceptibility of milk to develop SOF. The observed genetic variation in occurrence of SOF indicates that it may become a milk quality issue should bulls become selected that happen to carry genotypes predisposing for milk sensitive to oxidation.
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| 3. |
- Rodriguez, Saul, et al.
(author)
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Static Nonlinearity in Graphene Field Effect Transistors
- 2014
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In: IEEE Transactions on Electron Devices. - 0018-9383 .- 1557-9646. ; 61:8, s. 3001-3003
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Journal article (peer-reviewed)abstract
- The static linearity performance metrics of the graphene-based field effect transistor (GFET) transconductor are studied and modeled. Closed expressions are proposed for second-and third-order harmonic distortion (HD2, HD3), second-and third-order intermodulation distortion (Delta IM2, Delta IM3), and second-and third-order intercept points (A(IIP2), A(IIP3)). The expressions are validated through large-signal simulations using a GFET VerilogA analytical model and a commercial circuit simulator. The proposed expressions can be used during circuit design to predict the GFET biasing conditions at which linearity requirements are met.
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- Szabo, Attila, et al.
(author)
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Uncovering the Relationship Between Mathematical Ability and Problem Solving Performance of Swedish Upper Secondary School Students
- 2018
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In: Scandinavian Journal of Educational Research. - : Informa UK Limited. - 0031-3831 .- 1470-1170. ; 62:4, s. 555-569
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Journal article (peer-reviewed)abstract
- In this paper, we examine the interactions of mathematical abilities when 6 high achieving Swedish upper-secondary students attempt unfamiliar non-routine mathematical problems. Analyses indicated a repeating cycle in which students typically exploited abilities relating to the ways they orientated themselves with respect to a problem, recalled mathematical facts, executed mathematical procedures, and regulated their activity. Also, while the nature of this cyclic sequence varied little across problems and students, the proportions of time afforded the different components varied across both, indicating that problem solving approaches are informed by previous experiences of the mathematics underlying the problem. Finally, students’ whose initial problem formulations were numerical typically failed to complete the problem, while those whose initial formulations were algebraic always succeeded.
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- Szabo, Annika, 1972-, et al.
(author)
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Vocal Behavior in Environmental Noise : Comparisons Between Work and Leisure Conditions in Women With Work-related Voice Disorders and Matched Controls
- 2018
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In: Journal of Voice. - : Elsevier. - 0892-1997 .- 1873-4588. ; 32:1, s. 126.e23-126.e38
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Journal article (peer-reviewed)abstract
- Objectives: This study aimed to assess vocal behavior in women with voice-intensive occupations to investigate differences between patients and controls and between work and leisure conditions with environmental noise level as an experimental factor. Methods: Patients with work-related voice disorders, 10 with phonasthenia and 10 with vocal nodules, were matched regarding age, profession, and workplace with 20 vocally healthy colleagues. The sound pressure level of environmental noise and the speakers’ voice, fundamental frequency, and phonation ratio were registered from morning to night during 1 week with a voice accumulator. Voice data were assessed in low (≀55 dBA), moderate, and high (\textgreater70 dBA) environmental noise levels. Results: The average environmental noise level was significantly higher during the work condition for patients with vocal nodules (73.9 dBA) and their controls (73.0 dBA) compared with patients with phonasthenia (68.3 dBA) and their controls (67.1 dBA). The average voice level and the fundamental frequency were also significantly higher during work for the patients with vocal nodules and their controls. During the leisure condition, there were no significant differences in average noise and voice level nor fundamental frequency between the groups. The patients with vocal nodules and their controls spent significantly more time and used their voices significantly more in high–environmental noise levels. Conclusions: High noise levels during work and demands from the occupation impact vocal behavior. Thus, assessment of voice ergonomics should be part of the work environmental management. To reduce environmental noise levels is important to improve voice ergonomic conditions in communication-intensive and vocally demanding workplaces.
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| 7. |
- Goodall, R., et al.
(author)
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Generalised symmetries and the ermakov-lewis invariant
- 2005
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In: Journal of Nonlinear Mathematical Physics. - : Atlantis Press. - 1402-9251 .- 1776-0852. ; 12:1, s. 15-26
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Journal article (other academic/artistic)abstract
- Generalised symmetries and point symmetries coincide for systems of first-order ordinary differential equations and are infinite in number. Systems of linear first-order ordinary differential equations possess a generalised rescaling symmetry. For the system of first-order ordinary differential equations corresponding to the time-dependent linear oscillator the invariant of this symmetry has the form of the famous Ermakov-Lewis invariant, but in fact reveals a richer structure. © 2005 Taylor & Francis Group, LLC.
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