| 1. |
- Rieck, Carsten, et al.
(author)
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Time and Frequency Laboratory Activities at RISE
- 2024
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In: <em>Proceedings of the Annual Precise Time and Time Interval Systems and Applications Meeting, PTTI</em>. - : Institute of Electrical and Electronics Engineers Inc..
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Conference paper (peer-reviewed)abstract
- RISE Research Institutes of Sweden hosts most Swedish national metrology institute activities, including time and frequency that is located at its Borås facilities in the southwest of Sweden since 1995. UTC(SP) remains the official designation of the Swedish UTC(k) realization. It is implemented in a redundant classical master clock and phase stepper setup and is locally distributed to different users and time transfer applications. The local clock ensemble consists of hydrogen masers and high-performance commercial Cs standards but is complemented by clocks at two external sites with a redundant realization of UTC(SP). UTC(SP) is linked to TAI using TWSTFT and GNSS, with the primary link using the link combination TWGPPP. The time scale is regularly kept within ±5 ns of UTC, regular calibrations ensure high traceability to UTC. The two external realizations are linked using GNSS or White Rabbit. The time scales are publicly distributed using NTP or NTS. PTP, White Rabbit and GNSS based distribution and traceability is offered as services to customers. Additionally, RISE offers several calibration and monitoring services for the distribution of UTC-traceable time and frequency signals. Time and frequency research at RISE is concentrated on the refinement of GNSS and TWSTFT methods, their calibration and real-time dissemination methods. Traceability and security of network time is another focus area of increasing importance, as is the understanding of interference and its mitigation in the GNSS spectrum. The group is also active in research on fiber based optical frequency transfer. Outside the time metrological responsibilities, the group engages in applied research projects with the aim of establishing metrological aspects of time, frequency and dimension within energy distribution, positioning and navigation, and transport applications in the automotive and maritime domains.
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| 2. |
- Rieck, Carsten, et al.
(author)
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Time transfer with nanosecond accuracy using ethernet
- 2014
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In: Proceedings of the Annual Precise Time and Time Interval Systems and Applications Meeting, PTTI. - : Institute of Electrical and Electronics Engineers Inc.. - 2333-2085. - 9781634397940 ; , s. 74-78
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Conference paper (peer-reviewed)abstract
- Hardware aided time stamping of Ethernet frames is used to implement a two way time transfer. The method is capable to either operate actively by initiating or relaying frames, or passively by utilization the traffic on, preferably, optical links. Time stability of unfiltered measurements taken on local links is about 3.5 ns @ 1s TDEV, reaching below 1 ns for time intervals of about 100s. The presented method is specific to a family of commercial traffic analyzers, but can be generalized for any similar capable hardware.
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| 3. |
- Rieck, Carsten, et al.
(author)
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Synchronization of R-Mode Base Stations
- 2020
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In: IFCS-ISAF 2020 - Joint Conference of the IEEE International Frequency Control Symposium and IEEE International Symposium on Applications of Ferroelectrics, Proceedings. - : Institute of Electrical and Electronics Engineers Inc.. - 9781728164304
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Conference paper (peer-reviewed)abstract
- R-Mode is an alternative maritime PNT technology currently under development. It is based on synchronous transmissions and multilateration. Base station synchronization errors are recognized as the major error source. Introduction to R-Mode using maritime radio beacons, timing requirements, and the concept of R-Mode in-band synchronization are briefly presented.
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| 4. |
- Walser, Marion, 1961, et al.
(author)
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Local overexpression of GH and GH/IGF1 effects in the adult mouse hippocampus.
- 2012
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In: The Journal of endocrinology. - 1479-6805. ; 215:2, s. 257-68
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Journal article (peer-reviewed)abstract
- GH therapy improves hippocampal functions mainly via circulating IGF1. However, the roles of local GH and IGF1 expression are not well understood. We investigated whether transgenic (TG) overexpression in the adult brain of bovine GH (bGH) under the control of the glial fibrillary acidic protein (GFAP) promoter affected cellular proliferation and the expression of transcripts known to be induced by systemic GH in the hippocampus. Cellular proliferation was examined by 5-bromo-2'-deoxyuridine immunohistochemistry. Quantitative PCR and western blots were performed. Although robustly expressed, bGH-Tg did not increase either cell proliferation or survival. However, bGH-Tg modestly increased Igf1 and Gfap mRNAs, whereas other GH-associated transcripts were unaffected, i.e. the GH receptor (Ghr), IGF1 receptor (Igf1r), 2',3'-cyclic nucleotide 3'-phosphodiesterase (Cnp), ionotropic glutamate receptor 2a (Nr2a (Grin2a)), opioid receptor delta (Dor), synapse-associated protein 90/postsynaptic density-95-associated protein (Sapap2 (Dlgap2)), haemoglobin beta (Hbb) and glutamine synthetase (Gs (Glul)). However, IGF1R was correlated with the expression of Dor, Nr2a, Sapap2, Gs and Gfap. In summary, although local bGH expression was robust, it activated local IGF1 very modestly, which is probably the reason for the low response of previous GH-associated response parameters. This would, in turn, indicate that hippocampal GH is less important than endocrine GH. However, as most transcripts were correlated with the expression of IGF1R, there is still a possibility for endogenous circulating or local GH to act via IGF1R signalling. Possible reasons for the relative bio-inactivity of bGH include the bell-shaped dose-response curve and cell-specific expression of bGH.
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| 5. |
- Grossman, Alyssa, 1973
(author)
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Recollections: Working with Objects from Communist Romania
- 2014
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In: Architecture, Photography and the Contemporary Past, Claes Caldenby, Julia Tedroff, Andrej Slavik and Martin Farran-Lee (eds). - Stockholm : Art and Theory Publishing. - 9789198157352 ; , s. 130-137
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Book chapter (other academic/artistic)
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