| 1. |
- Cheng, Peng, et al.
(author)
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Stator-free RPM Sensor Using Accelerometers - A Statistical Performance Simulation by Monte Carlo Method
- 2011
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In: IEEE Sensors Journal. - 1530-437X .- 1558-1748. ; 11:12, s. 3368-3376
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Journal article (peer-reviewed)abstract
- This paper presents an statistical performance simulation for rigid-body revolutions per minute (RPM) measurement based on two uni-axial accelerometers mounted on rotor. In comparison with other existing sensing methods that are based on two coupled parts, namely stator and rotor and which include conventional electro-magnetic RPM sensors and photo-electric RPM sensors, this new stator-free inertial sensing principle has the advantage of high bandwidth at low RPM, true contact-free sensing and flexible installation. The paper first focuses on the description of the operating principle and the common mode rejection (CMR) method of the stator-free RPM sensor, and then its error model is developed and the error sources are statistically simulated based on Monte Carlo method. The simulation result presents a most interesting property of this sensor, that is, it gives lower precision at lower RPM and higher precision at higher RPM. The conclusion summarizes the modeling analysis result and motivates potential application for this new RPM sensing method.
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| 2. |
- Hagberg, Anette, et al.
(author)
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More Appreciation of Life or Regretting the Test? : Experiences of Living as a Mutation Carrier of Huntington's Disease
- 2011
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In: Journal of Genetic Counseling. - : Wiley. - 1059-7700 .- 1573-3599. ; 20:1, s. 70-79
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Journal article (peer-reviewed)abstract
- Little is known about how the knowledge of being a mutation carrier for Huntington's disease (HD) influences lives, emotionally and socially. In this qualitative study 10 interviews were conducted to explore the long term (> 5 years) experiences of being a mutation carrier. The results showed a broad variety of both positive and negative impact on the carriers' lives. The most prominent positive changes reported were a greater appreciation of life and a tendency to bring the family closer together. On the other hand, some participants expressed decisional regrets and discussed the negative impact this knowledge had on their psychological well-being. The knowledge variously served as either a motivator or an obstacle in pursuing further education, career or investment in personal health. Deeper understanding of people's reactions to the certainty of knowing they will become affected with HD is essential for the genetic counseling team in order to provide appropriate support.
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| 3. |
- Manoloiu, Alisa, et al.
(author)
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Comparison of PI and PR current controllers applied on two-level VSC-HVDC transmission system
- 2015
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In: IEEE PowerTech 2015. - 9781479976935 ; , s. Article no. 7232648-
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Conference paper (peer-reviewed)abstract
- This paper analyzes differences between αβ and dq reference frames regarding the control of two-level VSC-HVDC current loop and dc-link voltage outer loop. In the first part, voltage feedforward effect is considered with PI and PR controllers. In the second part, the feedforward effect is removed and the PR gains are tuned to keep the dynamic performance. Also, the power feedforward is removed and the outer loop PI controller is tuned in order to maintain the system dynamic performance. The paper is completed with simulation results, which highlight the advantages of using PR controller.
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| 4. |
- Olsén, Erik, 1994
(author)
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Optical characterisation of subwavelength dielectric particles using particle tracking beyond the Stokes-Einstein relation
- 2021
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Licentiate thesis (other academic/artistic)abstract
- As the importance of nanoparticles continues to increase in both biology and industrial processes, so does the need for accurate and versatile characterisation methods. However, most light-based methods to quantify size and refractive index of individual particles are either limited to snapshot observations, particles larger than the wavelength of light, non-dynamic particle properties, or assuming the hydrodynamic boundary conditions without experimental evaluation. The aim of this thesis is to partially overcome these limitations by further developing two different characterisation methods based on optical microscopy combined with particle tracking, where the analysis goes beyond the ordinary Stokes-Einstein relation. The first method combines off-axis holographic nanoparticle tracking with deep learning (Paper I). By utilizing the optical signal, both size and refractive index of individual particles with a minimum size of R=150 nm were accurately determined using only five particle observations. The method was evaluated using particles of different sizes, refractive indices, surrounding media as well as for polystyrene nanoparticle clusters, for which reversible fluctuations of the number of monomers could be resolved while the fractal dimension remained constant. The second method is based particles tethered to a laterally fluid supported lipid bilayer and quantification of their diffusivity and flow-induced motion (Paper II). By separating the friction contributions from the tethers and the particle, simultaneous measurement of size and diffusivity enabled a comparison with theory using partial slip as a fitting parameter. This was used to quantify the slip length for different lipid vesicles, and to clarify the size-dependent mechanistic aspects concerning the mobility of membrane-attached nanoparticles.
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| 5. |
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| 6. |
- Paerregaard, Karsten, 1952
(author)
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Lubricating Water Metabolism. How Mountain Offerings Contribute to Water Sustainability in the Peruvian Andes
- 2021
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In: kritisk etnografi. Swedish Journal of Anthropology. - 2003-1173. ; 4:2, s. 83-98
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Journal article (peer-reviewed)abstract
- !is article examines how water’s transformative quality shapes Andean offering rituals and how these in turn perform the hydrological cycle as a metabolic process that involves humans as well as superhuman beings. It enquires into the offering practices of an Andean community providing an ethnographic account of its water management and the tributes it pays to the mountain and the springs that supply it with water. Building on the concept of water metabolism, the article interrogates the offerings as a replica of the metabolic process that produces water. !e argument is that by triggering a “change of matter” of the offering items the ritual transforms these into a gift to the deities that control the water. Moreover, invoking Roy Rappaport’s study of rituals as regulators of humans’ interaction with the environment, the article suggests that by enacting water metabolism, Andean offerings not only lubricate the hydrological cycle, but they also offer Andean people a window on their own agency and its bearings for their water resources. Reviewing the recent development in a neighbouring settlement and ongoing changes in the community’s own water supply, the article concludes that the holistic calibration of the hydrological cycle as a metabolic process which engages both humans and non-humans makes Andean offerings emblematic of the effort to achieve water sustainability anywhere and therefore resilient to change.
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| 9. |
- Staecker, Jörn, et al.
(author)
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Die Europäisierung des Ostseeraumes
- 2004
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In: The European frontier : clashes and compromises in the Middle Ages. - 9122020721 ; , s. 3-10
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Conference paper (other academic/artistic)
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| 10. |
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