Tootfinder

Few-MHz bandwidth tunable optical filter based on a fiber-ring resonator
Gabriele Maron, Anton B\"olian, Xin-Xin Hu, Luke Masters, Arno Rauschenbeutel, J\"urgen Volz
https://arxiv.org/abs/2506.11953

Few-MHz bandwidth tunable optical filter based on a fiber-ring resonator
We present a fiber-ring resonator that realizes an ultra-narrowband, high-extinction, low-loss, tunable optical filter. It consists of a pair of commercial variable ratio directional couplers that allow precise adjustment of the filter bandwidth and its on-resonance transmission. This design also grants access to multiple modes of operation, such as a simultaneous band-stop and band-pass filter. Our characterization reveals a bandwidth of less than 2 MHz, together with an extinction exceeding 2…

This https://arxiv.org/abs/2504.09132 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csLG_…

Self-Supervised Autoencoder Network for Robust Heart Rate Extraction from Noisy Photoplethysmogram: Applying Blind Source Separation to Biosignal Analysis
Biosignals can be viewed as mixtures measuring particular physiological events, and blind source separation (BSS) aims to extract underlying source signals from mixtures. This paper proposes a self-supervised multi-encoder autoencoder (MEAE) to separate heartbeat-related source signals from photoplethysmogram (PPG), enhancing heart rate (HR) detection in noisy PPG data. The MEAE is trained on PPG signals from a large open polysomnography database without any pre-processing or data selection. Th…

Hubble constant constraint using 117 FRBs with a more accurate probability density function for ${\rm DM}_{\rm diff}$
Jiaming Zhuge, Marios Kalomenopoulos, Bing Zhang
https://arxiv.org/abs/2508.05161

Hubble constant constraint using 117 FRBs with a more accurate probability density function for ${\rm DM}_{\rm diff}$
Fast radio bursts (FRBs) are among the most mysterious astronomical transients. Due to their short durations and cosmological distances, their dispersion measure (DM) - redshift ($z$) relation is useful for constraining cosmological parameters and detecting the baryons in the Universe. The increasing number of localized FRBs in recent years has provided more precise constraints on these parameters. In this project, we collect 117 of the latest, localized FRBs, discuss the effect of a more accur…

Kkkkk, um bot scammer tentando aplicar um golpe em outro bot kkkk.
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Replaced article(s) found for physics.chem-ph. https://arxiv.org/list/physics.chem-ph/new
[1/1]:
- Efficient Implementation of Gaussian Process Regression Accelerated Saddle Point Searches with Ap...
Rohit Goswami, Maxim Masterov, Satish Kamath, Alejandro Pe\~na…

A narrowband burst from FRB 20190520B simultaneously observed by FAST and Parkes
Yuhao Zhu, Chenhui Niu, Shi Dai, Di Li, Pei Wang, Yi Feng, Jingwen Wu, Yongkun Zhang, Xianghan Cui, Junshuo Zhang, Jinhuang Cao
https://arxiv.org/abs/2507.17696

A narrowband burst from FRB 20190520B simultaneously observed by FAST and Parkes
Fast Radio Bursts (FRBs) are short-duration radio transients with mysterious origins. Since its uncertainty, there are very few FRBs that are observed by different instruments, simultaneously. This study presents a detailed analysis of a burst from FRB 20190520B observed by FAST and Parkes at the same time. The spectrum of this individual burst ended at the upper limit of the FAST frequency band and was simultaneously detected by the Parkes telescope in the 1.5-1.8 GHz range. By employing spect…

Design and Experimental Validation of UAV Swarm-Based Phased Arrays with MagSafe- and LEGO-Inspired RF Connectors
Bidya Debnath, Mst Mostary Begum, Prashant Neupant, Brooke E. Molen, Junming Diao
https://arxiv.org/abs/2507.22295

Design and Experimental Validation of UAV Swarm-Based Phased Arrays with MagSafe- and LEGO-Inspired RF Connectors
This paper presents a novel UAV swarm-based phased array antenna system that leverages MagSafe- and LEGO-inspired radio frequency (RF) connectors to address key challenges in distributed phased arrays, including inter-element oscillator synchronization, localization, phase coherence, and positional accuracy. The proposed non-threaded, hands-free connectors enable precise inter-element spacing and establish a continuous, low-loss RF signal propagation path during mid-flight docking. A multi-stag…

Bayesian network 3D event reconstruction in the Cygno optical TPC for dark matter direct detection
Fernando Domingues Amaro, Rita Antonietti, Elisabetta Baracchini, Luigi Benussi, Stefano Bianco, Francesco Borra, Cesidio Capoccia, Michele Caponero, Gianluca Cavoto, Igor Abritta Costa, Antonio Croce, Emiliano Dan\'e, Melba D'Astolfo, Giorgio Dho, Flaminia Di Giambattista, Emanuele Di Marco, Giulia D'Imperio, Matteo Folcarelli, Joaquim Marques Ferreira dos Santos, Davide Fior…

Bayesian network 3D event reconstruction in the Cygno optical TPC for dark matter direct detection
The CYGNO experiment is developing a high-resolution gaseous Time Projection Chamber with optical readout for directional dark matter searches. The detector uses a helium-tetrafluoromethane (He:CF$_4$ 60:40) gas mixture at atmospheric pressure and a triple Gas Electron Multiplier amplification stage, coupled with a scientific camera for high-resolution 2D imaging and fast photomultipliers for time-resolved scintillation light detection. This setup enables 3D event reconstruction: photomultiplie…

Theory of universal Planckian metal in t-J model: application for high-Tc cuprate superconductors
Yung-Yeh Chang, Khoe Van Nguyen, Kimberly Remund, Chung-Hou Chung
https://arxiv.org/abs/2506.15552

Theory of universal Planckian metal in t-J model: application for high-Tc cuprate superconductors
The mysterious quantum-critical Planckian bad metal phase with perfect T-linear resistivity persisting beyond the quasi-particle limit and universal T-linear scattering rate has been observed in various high-Tc cuprate superconductors. Here, we develop a realistic theoretical approach to this phase in an analytically solvable large-N multi-channel Kondo lattice model, derived from a heavy-fermion formulated conventionaL t-J model, known for qualitatively describing cuprates. This phase is origi…

A bad #Python bump morning in #Gentoo:
1. A project that couldn't be bothered to make a release with a security fix for 4 years finally made a release. Of course, if you make one release in 7 years, it is definitely a good idea to replace your build system with a broken #PythonPoetry #setuptools hybrid.
2. Another project made a release with a bunch of test failures — that were fixed in "master" branch already at the time, but I guess nobody bothered testing the release branch.
3. Just discovered that a bunch of projects are using pkg_resources namespaces again — and we were supposed to have gotten rid of them years ago! Of course it's #Google. And on top of that, since pkg_resources are now throwing deprecation warnings, they are indirectly breaking random other test suites.
On the positive side, test_lolwut is failing for me in redis-py.