| 1. |
- Duppils, Mattias, et al.
(author)
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Sampling and analog despreading of a DS/SS modulated signal directly on the IF waveform
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Other publication (other academic/artistic)abstract
- This paper introduces a method how to interpret the user data directly from a direct-sequence spread quaternary-phase-shift keyed (DS/QPSK) modulated wave-form without first demodulate nor digitize the waveform. The Methos is to sample the waveform, to weight each individual sample with -1, 0, or +1 according to the spreading code, and finally to accumulate these weighted samples. The wave-form carrier frequency is chosen as a multiple of the chop rate. This demonstrated with a 0.6μm CMOS test chip that is fed with a 2Mchip/s DS/QPSK modulated signal, shaped with a Root-Nyquist filter. The measurement result cerifies correct interpreting of transmitted data symbols (user data) represented over seven chips. The test chip further exhibit a measured noise figure 16.2dB at a bandwidth expansion of 7.
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| 3. |
- Kerren, Andreas, 1971-, et al.
(author)
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Why Integrate InfoVis and SciVis? : An Example from Systems Biology
- 2014
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In: IEEE Computer Graphics and Applications. - : IEEE. - 0272-1716 .- 1558-1756. ; 34:6, s. 69-73
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Journal article (other academic/artistic)abstract
- The more-or-less artificial barrier between information visualization and scientific visualization hinders knowledge discovery. Having an integrated view of many aspects of the target data, including a seamlessly interwoven visual display of structural abstract data and 3D spatial information, could lead to new discoveries, insights, and scientific questions. Such a view also could reduce the user’s cognitive load—that is, reduce the effort the user expends when comparing views.
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| 4. |
- Wolf, Annett
(author)
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Fifty year record of change in tree spatial patterns within a mixed deciduous forest
- 2005
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In: Forest Ecology and Management. - : Elsevier. - 0378-1127 .- 1872-7042. ; 215:1-3, s. 212-223
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Journal article (peer-reviewed)abstract
- Ripley's K-function was used to investigate the changes in spatial pattern among trees in a semi-natural mixed deciduous forest in Denmark over 50 years, from 1948 to 2001. Trees larger than 10 cm diameter in breast height (dbh) were mapped at 10-year intervals in 16 blocks within two former compartments. At the start of the observation, trees were found to be regularly distributed at distances less than 10 m. This pattern changed with time in different ways, depending on tree density at the beginning of the recording. Tree density has a greater influence on the number of recruits than on the number of dead trees. New recruits were significantly aggregated and positively correlated with dead trees, which suggests that regeneration occurred in canopy gaps. Compartments with many new recruits therefore showed a change in pattern towards more random distribution or even towards aggregation. In blocks with high basal area and few recruits, the pattern changed only slightly. Past management was found to be important in generating the patterns of tree distribution.
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| 5. |
- Stroh-Wollin, Ulla
(author)
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Rätt och fel om majonnäs
- 1998
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In: Upsala Nya Tidning. ; :14/4
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Journal article (pop. science, debate, etc.)
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| 6. |
- Wang, Chenglong, et al.
(author)
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Effects of vortex generators on the jet impingement heat transfer at different cross-flow Reynolds numbers
- 2016
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In: International Journal of Heat and Mass Transfer. - : Elsevier BV. - 0017-9310. ; 96, s. 278-286
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Journal article (peer-reviewed)abstract
- Experiments are carried out to investigate the effects of vortex generators on the jet impingement heat transfer in cross-flow. This study is a continuation of our previous research (Wang et al., 2015). In the present paper, the jet Reynolds number is fixed at 15,000 and the cross-flow Reynolds number varies from 40,000 to 64,000. The nozzle-to-surface distance to jet diameter ratio is 4.0. A vortex generator pair (VGP), placed in the cross-flow channel and upstream of the jet exit, is to enhance the impingement heat transfer. Both delta winglet (DW) and rectangular winglet (RW) are applied with different heights. Measurements of detailed heat transfer distributions on the impingement wall are conducted. Results show that the presence of VGP substantially augments the impingement heat transfer in cross-flow for all the cases, and its effect depends on the shape of the VGP, the height of the VGP, and also the cross-flow Reynolds number. The RW provides better heat transfer enhancement than the DW due to stronger vortical flow. The enhancement also increases monotonically with the height of the VGP. In addition, the averaged Nusselt number and pressure drop of the jet and cross-flow at different cross-flow Reynolds numbers are included. It is found that the favorable effects of the VGP are more significant as the cross-flow Reynolds number increases. Some PIV measurements were carried out. The flow structures and heat transfer mechanisms are discussed.
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| 7. |
- Carlé, Birte, et al.
(author)
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Danemark - Suède - Finlande
- 1996
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In: Hagiographies. - Turnhout : Brepols. - 250350471X ; , s. 501-545
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Book chapter (other academic/artistic)
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| 8. |
- Stauskas, Ovidijus
(author)
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On the Limit Theory of Mixed to Unity VARs: Panel Setting with Weakly Dependent Errors
- 2020
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In: Journal of Time Series Analysis. - : Wiley. - 0143-9782 .- 1467-9892. ; 41:6, s. 892-898
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Journal article (peer-reviewed)abstract
- In this article, we re‐visit a recent idea of Phillips and Lee (2015. Econometric Reviews 34: 1035 ‐ 1056). They examine an empirically relevant situation when two time series exhibit different degrees of non‐stationarity and one need to learn whether their persistence properties are the same. By bridging the asymptotic theory of local to unity and mildly explosive processes, they construct a Wald test for the commonality of the long‐run behavior of the series. However, inference is complicated by the fact that their statistic does not converge in distribution under the null and diverges under the alternative. This is true if the parameters of the data generating process are known and a re‐normalizing function can be constructed. If the parameters are unknown, which will be the case in practice, the test statistic may be divergent even under the null. We solve this problem by converting the original setting of vector time series into a panel setting with N individual vector series. We show that the proposed panel Wald test statistics converge to chi‐squared distribution which is free of nuisance parameters under the null hypothesis of common local to unity behavior. The result is an extreme example of simplified asymptotics brought about by panel data.
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| 9. |
- Chaudhuri, K Ray, et al.
(author)
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King's Parkinson's disease pain scale, the first scale for pain in PD: An international validation.
- 2015
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In: Movement Disorders. - : Wiley. - 0885-3185. ; 30:12, s. 1623-1631
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Journal article (peer-reviewed)abstract
- Pain is a key unmet need and a major aspect of non-motor symptoms of Parkinson's disease (PD). No specific validated scales exist to identify and grade the various types of pain in PD. We report an international, cross-sectional, open, multicenter, one-point-in-time evaluation with retest study of the first PD-specific pain scale, the King's PD Pain Scale. Its seven domains include 14 items, each item scored by severity (0-3) multiplied by frequency (0-4), resulting in a subscore of 0 to 12, with a total possible score range from 0 to 168. One hundred seventy-eight PD patients with otherwise unexplained pain (age [mean ± SD], 64.38 ± 11.38 y [range, 29-85]; 62.92% male; duration of disease, 5.40 ± 4.93 y) and 83 nonspousal non-PD controls, matched by age (64.25 ± 11.10 y) and sex (61.45% males) were studied. No missing data were noted, and floor effect was observed in all domains. The difference between mean and median King's PD Pain Scale total score was less than 10% of the maximum observed value. Skewness was marginally high (1.48 for patients). Factor analysis showed four factors in the King's PD Pain Scale, explaining 57% of the variance (Kaiser-Mayer-Olkin, 0.73; sphericity test). Cronbach's alpha was 0.78, item-total correlation mean value 0.40, and item homogeneity 0.22. Correlation coefficients of the King's PD Pain Scale domains and total score with other pain measures were high. Correlation with the Scale for Outcomes in PD-Motor, Non-Motor Symptoms Scale total score, and quality of life measures was high. The King's PD Pain Scale seems to be a reliable and valid scale for grade rating of various types of pain in PD. © 2015 International Parkinson and Movement Disorder Society.
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