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- Abbasi, A, et al.
(author)
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Progress on Partial Discharge Detectionunder DC Voltage Stress
- 2019
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Conference paper (other academic/artistic)abstract
- Detection and evaluation of partial discharges (PD) is important for quality assurance and diagnosis ofelectrical insulation systems. With increasing use of DC voltages in electrical transmission and distributionsystems, the field of PD under DC voltage stress needs to be further investigated.CIGRE Working Group D1.63 was approved for start in May 2015, where available knowledge and experiencein particular concerning the field distribution in insulation systems used in DC voltage systems, and thephysical processes of the PD phenomena under DC voltage stress should be reviewed. In order of guidingto meaningful procedures for DC PD measurements of HV equipment thorough understanding of i) thedifferences of PD behaviour between AC and DC with respect to the physical process and ii) influencingfactors of operating conditions (as e.g. polarization, temperature etc.) of different insulation systems underDC stress and respective effects on PD phenomena had to be examined.
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- Kamphuis, R., et al.
(author)
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Integrating demand flexibility with distributed generation - Renewable energy sources (DG-RES) at the residential household and commercial customer level in electricity grids
- 2017
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In: CIRED - Open Access Proceedings Journal. - : Institution of Engineering and Technology. ; , s. 1827-1830
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Conference paper (peer-reviewed)abstract
- Commercial and operational use of residential and commercial user demand-side flexibility in energy grids will play an important but, as yet, not disclosed role in realising the required increase in the penetration of DG-RES. An increased embedding potential is needed to satisfy ambitious energy efficiency and carbon dioxide emission targets. Introduction of smart technologies is seen as a facilitator but also encounters technological, operational, market and regulatory challenges. From assessing a number of technologies and field test projects, task 17 of the IEA/DSM program has explored the nature of this demand-side flexibility and the stakeholder context. It was found that a portfolio of services and control strategies for coordinating flexibility in an efficient, safe, reliable and scalable manner can be found. The boundary conditions, valuation and practical implementation are also discussed.
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- Ringdahl, Ulrika, et al.
(author)
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Molecular co-operation between protein PAM and streptokinase for plasmin acquisition by Streptococcus pyogenes.
- 1998
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In: Journal of Biological Chemistry. - 1083-351X. ; 273:11, s. 6424-6430
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Journal article (peer-reviewed)abstract
- Bacterial surface-associated plasmin formation is believed to contribute to invasion, although the underlying molecular mechanisms are poorly understood. To define the components necessary for plasmin generation on group A streptococci we used strain AP53 which exposes an M-like protein ("PAM") that contains a plasminogen-binding sequence with two 13-amino acid residues long tandem repeats (a1 and a2). Utilizing an Escherichia coli-streptococcal shuttle vector, we replaced a 29-residue long sequence segment of Arp4, an M-like protein that does not bind plasminogen, with a single (a1) or the combined a1a2 repeats of PAM. When expressed in E. coli, the purified chimeric Arp/PAM proteins both bound plasminogen, as well as plasmin, and when used to transform group A streptococcal strains lacking the plasminogen-binding ability, transformants with the Arp/PAM constructs efficiently bound plasminogen. Moreover, when grown in the presence of plasminogen, both Arp/PAM- and PAM-expressing streptococci acquired surface-bound plasmin. In contrast, plasminogen activation failed to occur on PAM- and Arp/PAM-expressing streptococci carrying an inactivated streptokinase gene: this block was overcome by exogenous streptokinase. Together, these results provide evidence for an unusual co-operation between a surface-bound protein, PAM, and a secreted protein, streptokinase, resulting in bacterial acquisition of a host protease that is likely to spur parasite invasion of host tissues.
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