Results 41 to 50 of about 344 (172)

An Alternative Approach to Spontaneous Photon Triplets Generation

Advanced Physics Research, Volume 5, Issue 3, March 2026.
Day by day, communication and computing technologies are progressing at a lightning speed, which is particularly true of the quantum version of these technologies (QIST). Increasingly, these technologies are emerging from unusual and sometimes bewildering quantum optical effects, which are based on exotic quantum physical theories.
Serge Gauvin
wiley   +1 more source

A Re‐Examination of Foundational Elements of Cosmology

Fortschritte der Physik, Volume 74, Issue 3, March 2026.
ABSTRACT This paper undertakes a conceptual re‐examination of several foundational elements of cosmology through the lens of spacetime symmetries. A new derivation of the Friedmann–Lemaître–Robertson–Walker metric is obtained by a careful conceptual examination of rotations and translations on generic manifolds, followed by solving the rotational and ...
Lavinia Heisenberg
wiley   +1 more source

State‐space analysis based pole‐to‐ground line fault isolation strategy for LCC–HVDC systems

IET Generation, Transmission & Distribution, 2019
The common way to isolate the line fault in line‐commutated converter‐based high‐voltage direct current (LCC‐HVDC) transmission grids is regulating the trigger angle of converters on both terminals of the faulted line, which usually depends entirely on ...
Zhihui Dai, Ningning Liu, Cheng Zhang, Siqi Yan   +3 more
doaj   +1 more source

Unveiling Hidden Features of Strongly Correlated Quantum Systems Through a Complex‐Network Analysis

Advanced Quantum Technologies, Volume 9, Issue 3, March 2026.
By applying complex network theory, we report a fundamental and previously unobserved phenomenon in the finite‐size Kitaev model: a singular point at which uniform, nonzero entanglement emerges among all fermion pairs, forming a complete entanglement network.
Guillem Llodrà, Roberta Zambrini, Gian Luca Giorgi   +2 more
wiley   +1 more source

Single‐ and Two‐Mode Squeezing by Modulated Coupling to a Rabi Driven Qubit

Advanced Quantum Technologies, Volume 9, Issue 3, March 2026.
A scheme for the generation of single‐ and two‐mode conditional‐squeezing of quantum harmonic oscillators by modulated coupling to a Rabi‐driven qubit is proposed. Simulations of a circuit QED system employing the scheme predict squeezing of more than 12dB and preparation of a superposition of 4dB squeezed states.
Eliya Blumenthal, NIr Gutman, Ido Kaminer, Shay Hacohen‐Gourgy   +3 more
wiley   +1 more source

Analysis of the multi-quadrant regulation ability and rapid reactive power support control strategy of CLCC

International Journal of Electrical Power & Energy Systems
The controllable line-commutated converter (CLCC) achieves forced commutation by using a hybrid connection of IGBTs and thyristors, effectively solving the inherent commutation failure (CF) problem of the line-commutated converter (LCC).
Yechun Xin, Zhiqiang Ma, Tuo Wang, Guoqing Li, Yupeng He, Shouqi Jiang   +5 more
doaj   +1 more source

High Voltage DC Active Current Injection to Simulate Geomagnetically Induced Currents in New Zealand

Space Weather, Volume 24, Issue 3, March 2026.
Abstract This study investigates the effects of geomagnetically induced currents (GIC) on New Zealand's electrical infrastructure via an intentional ground injection of direct current (DC) from a high voltage DC converter station. GIC manifests as quasi‐DC currents within power systems, potentially causing transformer saturation, increased reactive ...
Soren Subritzky, Andrew Lapthorn, Stewart Hardie, Paul Agger, Mike Dalzell, Mark A. Clilverd, Neil Cobbett, Ciaran Beggan, Juliane Hübert, Eliot Eaton, James B. Brundell, Craig J. Rodger   +11 more
wiley   +1 more source

Obstructions to homotopy invariance of loop coproduct via parameterized fixed‐point theory

Journal of Topology, Volume 19, Issue 1, March 2026.
Abstract Given f:M→N$f:M \rightarrow N$ a homotopy equivalence of compact manifolds with boundary, we use a construction of Geoghegan and Nicas to define its Reidemeister trace [T]∈π1st(LN,N)$[T] \in \pi _1^{st}(\mathcal {L}N, N)$. We realize the Goresky–Hingston coproduct as a map of spectra, and show that the failure of f$f$ to entwine the spectral ...
Lea Kenigsberg, Noah Porcelli
wiley   +1 more source

Subicular Astrocytes Govern Seizure‐Impaired Fear Memory

Advanced Science, Volume 13, Issue 7, 3 February 2026.
Astrocytes in dorsal subiculum act as a critical modulator of seizure‐associated cognitive dysfunction, operating through a Ca2+‐dependent adenosine‐linked astrocyte‐neuron signaling pathway that disrupts neuronal circuit homeostasis. This research highlights the potential of astrocyte‐targeted interventions as a therapeutic strategy, moving beyond the
Yuying Shao, Jing Xi, Yuhao Sun, Yulan Li, Zhisheng Li, Wangjialu Lu, Jialu Chen, Lin Yang, Fan Fei, Heming Cheng, Li Cheng, Cenglin Xu, Zhuo Huang, Vladimir Parpura, Yi Wang, Zhong Chen   +15 more
wiley   +1 more source

AC fault ride through control strategy on inverter side of hybrid HVDC transmission systems

Journal of Modern Power Systems and Clean Energy, 2019
Hybrid high-voltage direct current (HVDC) transmission systems employ a new type of HVDC transmission topology that combines the advantages of the line-commutated converter system and the voltage-source converter system.
Zexin Zhou, Zhengguang Chen, Xingguo Wang, Dingxiang Du, Guosheng Yang, Yizhen Wang, Liangliang Hao   +6 more
doaj   +1 more source