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Compact Free-Electron Lasers (FELs) offering broad, continuous spectral tunability are traditionally constrained by fixed-parameter magnetic structures and the necessity for high-energy electron beams. High-gain Harmonic Lasing (HL) has…

The integration of satellite and terrestrial networks is a promising solution for extending broadband coverage to areas not connected to a terrestrial infrastructure, as also demonstrated by recent commercial and standardisation endeavours.…

Networking and Internet Architecture · Computer Science 2017-11-22 A. Guidotti , A. Vanelli-Coralli , T. Foggi , G. Colavolpe , M. Caus , J. Bas , S. Cioni , A. Modenini

We employ a multipole-Taylor expansion to investigate how tightly the gravitational potential of the quadruple-image lens MG J0414+0534 is constrained by recent VLBI observations. These observations revealed that each of the four images of…

Astrophysics · Physics 2009-10-31 Catherine S. Trotter , Joshua N. Winn , Jacqueline N. Hewitt

We consider the offline imitation learning from observations (LfO) where the expert demonstrations are scarce and the available offline suboptimal data are far from the expert behavior. Many existing distribution-matching approaches…

Machine Learning · Computer Science 2026-02-03 Yongtao Qu , Shangzhe Li , Weitong Zhang

We provide a new interpretation of Hessian locally linear embedding (HLLE), revealing that it is essentially a variant way to implement the same idea of locally linear embedding (LLE). Based on the new interpretation, a substantial…

Machine Learning · Statistics 2021-12-17 Liren Lin , Chih-Wei Chen

The ongoing energy transition places significant pressure on the transmission network due to increasing shares of renewables and electrification. To mitigate grid congestion, transmission system operators need decision support tools to…

Systems and Control · Electrical Eng. & Systems 2025-10-16 Paul Bannmüller , Périne Cunat , Ali Rajaei , Jochen Cremer

The plasmon excitations in proposed single- and double-component helical liquid (HL) models are investigated within the random-phase approximation, by calculating the density-density, spin-density and spin-spin waves. The effect due to…

Materials Science · Physics 2015-06-03 O. Roslyak , Godfrey Gumbs , D. H. Huang

Building upon earlier work, we explore the limits of using a configuration of satellites to measure the trace of the gravitational gradient tensor using intersatellite laser ranging and timing observables without relying on high-precision…

General Relativity and Quantum Cosmology · Physics 2025-04-01 Viktor T. Toth

Cooperation between satellite and terrestrial wireless networks promises great potential in meeting fast-growing demands for ubiquitous communications coverage. To tackle spectrum scarcity, spectrum sharing is studied for a hybrid…

Information Theory · Computer Science 2026-01-27 Yanmin Wang , Wei Feng , Yunfei Chen , Yongxu Zhu , Shidong Zhou , Cheng-Xiang Wang

The propagation of a weak probe field in a four-level N-type quantum system in the presence of spontaneously generated coherence (SGC) is theoretically investigated. The optical properties of the system are studied and it is shown that the…

Atomic and Molecular Clusters · Physics 2013-03-05 Lida Ebrahimi Zohravi , Majid Abedi , Mohammad Mahmoudi

In this work, we investigate the generation and propagation of gravitational waves within a minimal gravitational SME (Standard Model Extension). Starting from the modified graviton dispersion relation derived in the linearized gravity…

General Relativity and Quantum Cosmology · Physics 2026-03-16 A. A. Araújo Filho , N. Heidari , Iarley P. Lobo

Spectral lines of helium are commonly observed on the Sun. These observations contain important informations about physical conditions and He/H abundance variations within solar outer structures. The modeling of chromospheric and coronal…

Solar and Stellar Astrophysics · Physics 2011-05-19 Pierre Gouttebroze , Nicolas Labrosse

In this paper, we present a mechanism for building hybrid system observers to differentiate between specific positions of the hybrid system. The mechanism is designed through inferring metric temporal logic (MTL) formulae from simulated…

Systems and Control · Electrical Eng. & Systems 2020-04-07 Zhe Xu , Yi Deng , Agung Julius

As experimentalists explore new opportunities in strong field radiation offered by current generation light sources, new theoretical tools become inevitable in dealing with the challenging non-linear dynamics that come into play as a result…

Atomic Physics · Physics 2017-11-06 E. Jobunga

The number of mobile users is increasing rapidly, 3GPP initiated a new technology 4G Long Term Evolution (LTE). LTE is an enabling technology as a solution to the problem of network capacity and quality in areas that have a high demand like…

Systems and Control · Electrical Eng. & Systems 2022-03-24 Firdaus , Rifa Atul Izza Asyari , Eka Indarto

In this work, we prove rigorous error estimates for a hybrid method introduced in [15] for solving the time-dependent radiation transport equation (RTE). The method relies on a splitting of the kinetic distribution function for the…

Numerical Analysis · Mathematics 2023-06-09 Andrés Galindo-Olarte , Victor P. DeCaria , Cory D. Hauck

Speculative decoding accelerates LLM inference by using a fast draft model to generate tokens and a more accurate target model to verify them. Its performance depends on the $\textit{acceptance length}$, or number of draft tokens accepted…

Computation and Language · Computer Science 2026-05-20 Avinash Kumar , Sujay Sanghavi , Poulami Das

We study the propagation of a Laguerre-Gaussian (LG) beam through a dispersive atomic medium. We restrict ourselves to applying a weak probe field and three strong coupling fields to the medium, which leads to developing a four-level double…

Optics · Physics 2020-07-23 Zahra Amini Sabegh , Mohammad Mahmoudi

We present a statistically grounded methodology for recovering physically consistent initial conditions from historical two-line element sets (TLEs), enabling accurate long-arc trajectory reconstruction for distant and highly eccentric…

Earth and Planetary Astrophysics · Physics 2025-07-01 Binyamin Stivi , Vishnuu Mallik , Lamberto Dell'Elce , Aaron J. Rosengren

Robust cognitive radio development requires accurate 3D path loss models. Traditional empirical models often lack environment-awareness, while deep learning approaches are frequently constrained by the scarcity of large-scale training…

Signal Processing · Electrical Eng. & Systems 2026-04-07 Mushfiqur Rahman , Ismail Guvenc , David Matolak
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