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- Herjulfsdotter Andersson, Ritwa, 1965, et al.
(author)
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Kärleksört (Sedum telephium)
- 2005
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In: Människan och floran. - : Wahlström & Widstrand. - 9146177892
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Book chapter (other academic/artistic)
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| 4. |
- Hermansson, Kersti, et al.
(author)
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The experimental electron density in lithium hydroxide monohydrate
- 1982
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In: Acta Crystallogr. B, Struct. Crystallogr. Cryst. Chem. (Denmark). - 0567-7408. ; B38, s. 2555-2563
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Journal article (peer-reviewed)abstract
- The deformation electron density has been studied in LiOH.H 2O at 295K using a combination of X-ray and neutron diffraction data. Notoriously high extinction was present in the neutron data. Despite an attempt to reduce this by shock-cooling, the subsequent refinement of an extinction correction met with only partial success. Limited use was thus made of the neutron data in the determination of static multipole deformation density maps. The resulting peak maximum in the O-H bonds of the water molecule is 0.66 e Aring -3, and of the OH - ion 0.49 e Aring -3. Lower peaks are observed in the lone-pair regions: 0.22 e Aring -3 for H 2O and 0.27 e Aring -3 for OH -. These are to be compared with the results of theoretical ab initio calculations given by Hermansson and Lunnell (1982).
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- HERMANSSON, KERSTI, et al.
(author)
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THE OH VIBRATIONAL-SPECTRUM OF LIQUID WATER FROM COMBINED ABINITIO AND MONTE-CARLO CALCULATIONS
- 1991
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In: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 95:10, s. 7486-7496
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Journal article (peer-reviewed)abstract
- The infrared vibrational OH stretching spectrum of isotopically isolated HDO molecules in liquid water has been calculated by ab initio methods at the MP2 level for a number of geometrical configurations taken from a Monte Carlo simulation. Each vibrating water molecule with its environment was described by a pentamer supermolecule, surrounded by a large number of point charges representing polarized water molecules. The anharmonic stretching potentials (MP2 force constants up to fifth order) for 40 uncoupled OH water vibrators were calculated. The average computed r(e) distance found for liquid water is 0.01 angstrom longer than the free-water value. The frequencies were obtained by solving the one-dimensional Schrodinger equation variationally for each OH potential curve. Using the squared dipole moment derivatives, which vary by a factor of 7 over the frequency band, the density-of-states histograms were converted to intensities. The resulting computed average frequency downshift is approximately 260 cm-1, compared to approximately 310 cm-1 (experimental), with a bandwidth in good agreement with experiment. The remaining discrepancy between theoretical and experimental frequency shifts is to a large part due to the charge transfer within the water clusters. This charge transfer gives rise to an electrostatic field which, at the site of the vibrating H atom, counteracts the downshift induced by the other environmental effects. The agreement between experiment and theory is very satisfactory when this charge transfer effect is corrected for or when point-charge embedded heptamer clusters are considered.
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- Hopsch, Lena, 1961, et al.
(author)
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Traveling, Inhabiting, Experiencing – A Phenomenology for Public Transit
- 2014
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In: Environmental and Architectural Phenomenology. - 1083-9194. ; 25:1, s. 9-14
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Journal article (other academic/artistic)abstract
- In public transit, efficient movement and way finding are often at odds with human identity and environmental presence. Indeed, public transit often succeeds by transforming human beings into algorithms of movement and regarding their full humanity as a necessary sacrifice to efficiency. The design of transit environments often jettisons anything not instrumental to processing information about movement and orientation, including sensory engagement. Yet sensory engagement allows us to bond with a place and deepen our sense of orientation and safety.It is through the sensory capacities of our body that we get to know the world and make sense of it, according to French phenomenologist Maurice Merleau-Ponty, who explores the links between perception and meaning at length.
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- Klaus, Tobias, et al.
(author)
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Constrained Data-Age with Job-Level Dependencies : How to Reconcile Tight Bounds and Overheads
- 2021
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In: 2021 IEEE 27Th Real-Time And Embedded Technology And Applications Symposium (Rtas 2021). - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 66-79
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Conference paper (peer-reviewed)abstract
- Many industrial real-time systems rely on the implicit register communication paradigm to minimize overheads and ease distributed development. Here, tasks follow a simple input-processing-output scheme, and data is passed without synchronization by the last-is-best semantics. In these systems, the age of data is the primary real-time objective, which is defined by data-flow chains that span from the system's inputs to outputs. Consequently, a real-time analysis aims to provide guarantees on worst-case data age. In general, there are two main approaches: (1) Task-level scheduling such that inter-task communication is arranged at the beginning and end of a task's execution interval, which guarantees a deterministic yet highly pessimistic data age. (2) Job-level dependencies (JLD) that are added at critical points in the schedule to link specific job instances of tasks of a multi-rate data-flow chain, which provides tighter upper bounds on data ages. However, the drawback is that JLDs induce substantial synchronization overheads, impact the overall schedulability, and are much more challenging to implement. In this paper, we address the trade-off between tight data-age guarantees, synchronization overheads, and schedulability in multi-core settings. Our proposed solution is to combine the potential of job-level optimization with the determinism and low overheads of static, task-level approaches. Therefore, we present a novel execution model to efficiently map data-age constrained tasksets with job-level dependencies on event-triggered systems by automated system analysis and transformation. Experimental results of an extensive real-world case study substantiate that our approach can further tighten data-age bounds, reduce overheads, and ease schedulability.
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