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Multi-user Downlink with Reconfigurable Intelligent Metasurface Antennas (RIMSA) Array
Xuejian Wei, Hui-Ming Wang
https://arxiv.org/abs/2506.18418 https://…

Multi-user Downlink with Reconfigurable Intelligent Metasurface Antennas (RIMSA) Array
Reconfigurable Intelligent Surfaces (RIS) is a transformative technology with great potential in many applications in wireless communications and realizing the Internet of Everything at sixth generation (6G). In this study, we propose a wireless system where the RIS acts as an antenna, which we call Reconfigurable Intelligent Metasurface Antennas (RIMSA). In particular, the base station (BS) equipped with a RIMSA array performs downlink transmissions to multiple users, where each user has a sin…

Replaced article(s) found for stat.ME. https://arxiv.org/list/stat.ME/new
[1/1]:
- Structural restrictions in local causal discovery: identifying direct causes of a target variable
Juraj Bodik, Val\'erie Chavez-Demoulin

Multiple Active STAR-RIS-Assisted Secure Integrated Sensing and Communication via Cooperative Beamforming
Hyeonho Noh, Hyeonsu Lyu, Hyun Jong Yang
https://arxiv.org/abs/2507.18035

Multiple Active STAR-RIS-Assisted Secure Integrated Sensing and Communication via Cooperative Beamforming
This paper explores an integrated sensing and communication (ISAC) network empowered by multiple active simultaneously transmitting and reflecting reconfigurable intelligent surfaces (STAR-RISs). A base station (BS) furnishes downlink communication to multiple users while concurrently interrogating a sensing target. We jointly optimize the BS transmit beamformer and the reflection/transmission coefficients of every active STAR-RIS in order to maximize the aggregate communication sum-rate, subje…

XRISM Pre-Pipeline and Singularity: Container-Based Data Processing for the X-Ray Imaging and Spectroscopy Mission and High-Performance Computing
Satoshi Eguchi, Makoto Tashiro, Yukikatsu Terada, Hiromitsu Takahashi, Masayoshi Nobukawa, Ken Ebisawa, Katsuhiro Hayashi, Tessei Yoshida, Yoshiaki Kanemaru, Shoji Ogawa, Matthew P. Holland, Michael Loewenstein, Eric D. Miller, Tahir Yaqoob, Robert S. Hill, Morgan D. Waddy, Mark M. Mekosh, Joseph B. Fox, Isabella S. Brewer, Emily Aldoretta, Y…

XRISM Pre-Pipeline and Singularity: Container-Based Data Processing for the X-Ray Imaging and Spectroscopy Mission and High-Performance Computing
The X-Ray Imaging and Spectroscopy Mission (XRISM) is the seventh Japanese X-ray observatory whose development and operation are in collaboration with universities and research institutes in Japan, the United States, and Europe, including JAXA, NASA, and ESA. The telemetry data downlinked from the satellite are reduced to scientific products using pre-pipeline (PPL) and pipeline (PL) software running on standard Linux virtual machines (VMs) for the JAXA and NASA sides, respectively. OBSIDs iden…

Gear-based Metamaterials for Extraordinary Bandgap Tunability
Xin Fang, Jihong Wen, Dianlong Yu, Peter Gumbsch, Huajian Gao
https://arxiv.org/abs/2506.20110

Gear-based Metamaterials for Extraordinary Bandgap Tunability
Metamaterials can be engineered with tunable bandgaps to adapt to dynamic and complex environments, particularly for controlling elastic waves and vibration. However, achieving wide-range, seamless, reversible, in-situ and robust tunability remains challenging and often impractical due to limitations in bandgap mechanisms and design principles. Here, we introduce gear-based metamaterials with unprecedented bandgap tunability. Our approach leverages Taiji planetary gear systems as variable-frequ…

Replaced article(s) found for math.CA. https://arxiv.org/list/math.CA/new
[1/1]:
- On the Packing Functions of some Linear Sets of Lebesgue Measure Zero
Austin Anderson, Steven Damelin

Replaced article(s) found for stat.OT. https://arxiv.org/list/stat.OT/new
[1/1]:
- Structural restrictions in local causal discovery: identifying direct causes of a target variable
Juraj Bodik, Val\'erie Chavez-Demoulin

Counter-Streaming Velocities in a Quiescent Filament
Garima Karki, Brigitte Schmieder, Pascal Demoulin, Pooja Devi, Ramesh Chandra, Reetika Joshi
https://arxiv.org/abs/2506.18115 …

Counter-Streaming Velocities in a Quiescent Filament
Filaments/prominences are cold plasma (~ 10000 K) embedded in the solar corona, two orders of magnitude hotter. Filament plasma is structured by the magnetic field in thin elongated threads. Counter-streaming flows have been observed. The aim of this paper is to characterize these flows. For that, we use high spatial resolution observations of spectral data obtained with THEMIS in H-alpha and with IRIS in Mg II k lines on 29 September 2023. We best detect counter-streaming flows in both the blu…

Sum-Rate Maximization for Movable-Antenna Array Enhanced Downlink NOMA Systems
Nianzu Li, Peiran Wu, Lipeng Zhu, Weidong Mei, Boyu Ning, Derrick Wing Kwan Ng
https://arxiv.org/abs/2507.15555

Sum-Rate Maximization for Movable-Antenna Array Enhanced Downlink NOMA Systems
Movable antenna (MA) systems have recently attracted significant attention in the field of wireless communications owing to their exceptional capability to proactively reconfigure wireless channels via flexible antenna movements. In this paper, we investigate the resource allocation design for an MA array-enhanced downlink non-orthogonal multiple access (NOMA) system, where a base station deploys multiple MAs to serve multiple single-antenna users. Our goal is to maximize the sum rate of all us…