| 1. |
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| 2. |
- Schiessl, W, et al.
(författare)
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Magnetic properties of the ZnFe2O4 spinel
- 1996
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Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. ; 53:14, s. 9143-9152
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Using neutron diffraction (ND), muon-spin rotation/relaxation (mu SR), and Fe-57 and Zn-67 Mossbauer spectroscopy (MS) we investigated magnetic properties of the normal spinel ZnFe2O4. Inversion is below limits of detection in samples which were slowly co
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| 3. |
- Badrzadeh, B, et al.
(författare)
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The Need or Enhanced Power System Modelling Techniques and Simulation Tools
- 2020
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Ingår i: CIGRE SCIENCE & ENGINEERING. - 2426-1335. ; 17:Febr, s. 30-46
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Tidskriftsartikel (refereegranskat)abstract
- The transition to a clean energy future requires thorough understanding of increasingly complex interactions between conventional generation, network equipment, variable renewable generation technologies (centralised and distributed), and demand response. Secure and reliable operation under such complex interactions requires the use of more advanced power system modelling and simulation tools and techniques. Conventional tools and techniques are reaching their limits to support such paradigm shifts. This paper provides an overview of commonly used and emerging power system simulation tools and techniques. Applications of these tools ranging from real-time power system operation to long-term planning are also discussed. Various approaches to gain confidence in the accuracy and applicability of the simulation models are presented. The paper then discusses emerging trends in simulation tools and techniques primarily stemming from the transition to a power system with increased penetration of inverter-based resources as these are used in variable renewable energy technologies.
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| 4. |
- Burghart, FJ, et al.
(författare)
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Muons and muonium in Zn-spinels
- 1997
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Ingår i: HYPERFINE INTERACTIONS. - : BALTZER SCI PUBL BV. - 0304-3843. ; 106:1-4, s. 187-192
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We have studied the magnetic spinel (Zn)[Fe-2]O-4 (T-N approximate to 10.5 K) and the non-magnetic spinels (Zn)[Al-2]O-4, (Zn)[Ga-2]O-4, (Zn)[ZnTi]O-4 and (Zn)[ZnSn]O-4, both with surface and decay channel muons. In (Zn)[Fe-2]O-4 the relaxation rate incre
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| 5. |
- Kuridze, D., et al.
(författare)
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Mapping the Magnetic Field of Flare Coronal Loops
- 2019
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 874:2
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Tidskriftsartikel (refereegranskat)abstract
- Here, we report on the unique observation of flaring coronal loops at the solar limb using high-resolution imaging spectropolarimetry from the Swedish 1 m Solar Telescope. The vantage position, orientation, and nature of the chromospheric material that filled the flare loops allowed us to determine their magnetic field with unprecedented accuracy using the weak-field approximation method. Our analysis reveals coronal magnetic field strengths as high as 350 G at heights up to 25 Mm above the solar limb. These measurements are substantially higher than a number of previous estimates and may have considerable implications for our current understanding of the extended solar atmosphere.
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| 6. |
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| 7. |
- Rueda-Torres, JL, et al.
(författare)
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Evaluation of Voltage Stability Assessment Methodologies in Transmission Systems : TR 109
- 2023
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The Joint Working Group C4/C2.58/IEEE was established to review voltage stability of power systems in the context of increased penetration of Inverter Based Resources (IBR) in electric power grids. The focus was to evaluate the adequacy of existing methods of voltage stability assessment in the present-day context. The developed technical brochure reviewed the definition of voltage stability and explained the role of voltage stability assessment within the voltage security assessment task of near real time power system operation. The overall conclusion is that the controllers implemented on IBRs makes a significant influence on short-term, but also long-term voltage stability. The presence of IBRs at distribution voltage levels contribute to the dynamic behavior of the power grid. Voltage stability assessment must incorporate these facts to ensure that the methods and tools accurately capture voltage stability limits.
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