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The powder stream from a side feed nozzle, or part of the powder stream in some coaxial nozzles, in a directed energy deposition via powder feeding (DED-PF) machine, can be modeled using a particle velocity field that has a constant…

Applied Physics · Physics 2022-10-03 Alexander Martinez-Marchese , Maximilian Klumpp , Ehsan Toyserkani

Text image super-resolution (Text-SR) requires more than visually plausible detail synthesis: slight errors in stroke topology may alter character identity and break readability. Existing methods improve text fidelity with stronger…

Computer Vision and Pattern Recognition · Computer Science 2026-05-14 Zihang Xu , Xiaoyang Liu , Zheng Chen , Yulun Zhang , Xiaokang Yang

We report the first report on cyclotron line studies with the LAXPC instrument onboard AstroSat of the High mass X-ray Binary pulsar 4U 1538-52. During the observation of source which spanned about one day with a net exposure of 50 ks,the…

High Energy Astrophysical Phenomena · Physics 2018-12-26 Varun , Chandreyee Maitra , Pragati Pradhan , Harsha Raichur , Biswajit Paul

In an aircraft electric power system (EPS), a supervisory control unit must actuate a set of switches to distribute power from generators to loads, while satisfying safety, reliability and real-time performance requirements. To reduce…

Systems and Control · Computer Science 2013-11-26 Pierluigi Nuzzo , John Finn , Mohammad Mozumdar , Alberto Sangiovanni-Vincentelli

Photodissociation regions (PDRs) contain a large fraction of all of the interstellar matter in galaxies. Classical examples include the boundaries between ionized regions and molecular clouds in regions of massive star formation, marking…

Astrophysics of Galaxies · Physics 2015-07-01 D. J. Stock , M. G. Wolfire , E. Peeters , A. G. G. M. Tielens , B. Vandenbussche , C. Boersma , J. Cami

Streamers are the first stage of sparks and lightning; they grow due to a strongly enhanced electric field at their tips; this field is created by a thin curved space charge layer. These multiple scales are already challenging when the…

Plasma Physics · Physics 2011-08-08 Chao Li , Ute Ebert , Willem Hundsdorfer

Accurate characterization of subsurface flow is critical for Carbon Capture and Storage (CCS) but remains challenged by the ill-posed nature of inverse problems with sparse observations. We present Function-space Decoupled Diffusion…

Machine Learning · Computer Science 2026-03-04 Xin Ju , Jiachen Yao , Anima Anandkumar , Sally M. Benson , Gege Wen

At the high $n_{e}$ proposed for high-field fusion reactors, it is uncertain whether ionization, as opposed to plasma transport, will be most influential in determining $n_{e}$ at the pedestal and separatrix. A database of Alcator C-Mod…

Plasma Physics · Physics 2024-07-10 M. A. Miller , J. W. Hughes , S. Mordijck , M. Wigram , J. Dunsmore , R. Reksoatmodjo , R. S. Wilcox

Studying compact star binaries and their mergers is integral to determining progenitors for observable transients. Today, compact-star mergers are typically studied via state-of-the-art computational fluid dynamics codes. One such numerical…

Instrumentation and Methods for Astrophysics · Physics 2023-07-26 M. Alexander R. Kaltenborn , Michael J. Falato , Oleg Korobkin , Irina Sagert , Wesley P. Even

Materials subjected to neutron irradiation experience damage due to displacement cascades triggered by nuclear reactions. This paper presents a practical method to calculate primary atomic recoil events (PKAs), which lead to cascade damage,…

Computational Physics · Physics 2024-06-13 Faranak Hatami

Diffusion language models generate text through iterative denoising under a uniform refinement rule applied to all tokens. However, tokens stabilize at different rates in practice, leading to substantial redundant refinement and motivating…

Artificial Intelligence · Computer Science 2026-03-06 Lipeng Wan , Jianhui Gu , Junjie Ma , Jianguo Huang , Shiguang Sun , Siyuan Li , Xuguang Lan

For efficiency, preference alignment is often performed on compact, knowledge-distilled (KD) models. We argue this common practice introduces a significant limitation by overlooking a key property of the alignment's reference model: its…

Machine Learning · Computer Science 2025-09-30 Sungmin Cha , Kyunghyun Cho

Cardiopulmonary resuscitation (CPR) is one of the essential tools to ensure oxygen supply during cardiac arrest. However, the precise effects of chest compression are not quantifiable to this day. This often results in a low quality of…

The James Webb Space Telescope enabled the first detection of several rovibrational emission lines of HD in the Orion Bar, a prototypical photodissociation region. This provides an incentive to examine the physics of HD in dense and strong…

Pedestrian Attribute Recognition (PAR) is a challenging task as models are required to generalize across numerous attributes in real-world data. Traditional approaches focus on complex methods, yet recognition performance is often…

Computer Vision and Pattern Recognition · Computer Science 2025-09-03 Alejandro Alonso , Sawaiz A. Chaudhry , Juan C. SanMiguel , Álvaro García-Martín , Pablo Ayuso-Albizu , Pablo Carballeira

We develop a self-consistent nonlinear extension of diffusive shock acceleration that incorporates cosmic ray (CR) backreaction on the shock precursor together with a physically motivated upstream-escape mechanism that produces an…

High Energy Astrophysical Phenomena · Physics 2026-02-17 Han-Xiang Hu , Xing-Jian Lv , Xiao-Jun Bi , Tian-Lu Chen , Kun Fang , Peng-Fei Yin

We present a new simulation engine for fast generation of ultra-high energy cosmic ray data based on parametrizations of common assumptions of UHECR origin and propagation. Implemented are deflections in unstructured turbulent extragalactic…

High Energy Astrophysical Phenomena · Physics 2014-01-09 Hans-Peter Bretz , Martin Erdmann , Peter Schiffer , David Walz , Tobias Winchen

Proplyds are photodissociation region (PDR)-like cometary cocoons around young stars which are thought to originate through photo-evaporation of the central protoplanetary disk by external UV radiation from the nearby OB stars. This letter…

Solar and Stellar Astrophysics · Physics 2015-06-12 Silvia Vicente , Olivier Berne , Alexander G. G. M. Tielens , Nuria Huelamo , Eric Pantin , Inga Kamp , Andres Carmona

Plasma of a stationary ECR discharge sustained by gyrotron radiation at a frequency of 24 GHz and a power of up to 600 W in a mirror magnetic trap was studied. At pressures near the gas breakdown threshold, the extinction effect of an…

Plasma Physics · Physics 2018-10-17 D. A. Mansfeld , A. V. Vodopyanov , M. D. Tokman , N. D. Kirukhin , D. I. Yasnov , V. E. Semenov