Tootfinder

Sometimes you see an STL and it looks simple but has a restrictive license so you decide to make your own version...
This is a bike reflector in three parts that screws together (after adding reflective tape to one part) and hides an Apple AirTag inside. It then zip ties to your seat post.
(Needs a few more tweaks before I share it.)
#STL

Direct Neutron Reactions in Storage Rings Utilizing a Supercompact Cyclotron Neutron Target
Ariel Tarife\~no-Saldivia, C\'esar Domingo-Pardo, Iris Dillmann, Yuri A. Litvinov
https://arxiv.org/abs/2508.15465

Direct Neutron Reactions in Storage Rings Utilizing a Supercompact Cyclotron Neutron Target
We propose a new approach for a high-density free-neutron target, primarily aimed at nuclear astrophysics reaction studies in inverse kinematics with radioactive ions circulating in a storage ring. The target concept integrates four key subsystems: a neutron production source driven by a supercompact cyclotron utilizing $^9$Be($p,xn$) reactions, an optimized moderator/reflector assembly using either heavy-water or beryllium oxide with a graphite reflector shell to thermalize fast neutrons, a cr…

Consistency analysis and nuclear data validation for two series of beryllium reflector critical benchmark experiments
Shengli Chen, Tianxiang Wang
https://arxiv.org/abs/2507.12757

Consistency analysis and nuclear data validation for two series of beryllium reflector critical benchmark experiments
Neutron-induced nuclear reaction data on beryllium playing a crucial role in nuclear application. However, discrepancies have been observed in two closely related series of beryllium-reflector fast-spectrum critical benchmark experiments, HMF-058 and HMF-066, which are widely used in current nuclear data validation. In this work, we address these inconsistencies by improving the secondary angular distributions of the (n,n) and (n,2n) reactions of beryllium, thereby making the theoretical calcul…

A Miniature High-Resolution Tension Sensor Based on a Photo-Reflector for Robotic Hands and Grippers
Hyun-Bin Kim, Kyung-Soo Kim
https://arxiv.org/abs/2507.00464

A Miniature High-Resolution Tension Sensor Based on a Photo-Reflector for Robotic Hands and Grippers
This paper presents a miniature tension sensor using a photo-reflector, designed for compact tendon-driven grippers and robotic hands. The proposed sensor has a small form factor of 13~mm x 7~mm x 6.5~mm and is capable of measuring tensile forces up to 200~N. A symmetric elastomer structure incorporating fillets and flexure hinges is designed based on Timoshenko beam theory and verified via FEM analysis, enabling improved sensitivity and mechanical durability while minimizing torsional deformat…

Enhanced Absorption in Thin-Film Silicon Solar Cells Using a Broadband Plasmonic Nanostructure
Partha Mondal, Omar Alkhazragi, Hakan Bagci
https://arxiv.org/abs/2506.16118

Enhanced Absorption in Thin-Film Silicon Solar Cells Using a Broadband Plasmonic Nanostructure
The design and fabrication of a metal-dielectric-metal absorber that achieves strong absorption from the ultraviolet (UV) to the near-infrared (near-IR) spectrum are presented. The proposed nanostructure consists of a periodic titanium (Ti) array as the top layer, a thin silicon dioxide (SiO2) spacer, and a continuous aluminum (Al) layer serving as the back reflector. Comprehensive optimization of structural parameters results in an average absorptance of 96% in the 280-1000 nm wavelength range…

Reduced-order modeling of Hamiltonian dynamics based on symplectic neural networks
Yongsheng Chen, Wei Guo, Qi Tang, Xinghui Zhong
https://arxiv.org/abs/2508.11911 https://

Reduced-order modeling of Hamiltonian dynamics based on symplectic neural networks
We introduce a novel data-driven symplectic induced-order modeling (ROM) framework for high-dimensional Hamiltonian systems that unifies latent-space discovery and dynamics learning within a single, end-to-end neural architecture. The encoder-decoder is built from Henon neural networks (HenonNets) and may be augmented with linear SGS-reflector layers. This yields an exact symplectic map between full and latent phase spaces. Latent dynamics are advanced by a symplectic flow map implemented as a …

Meta-heuristic design of a light-weight homologous backup structure of the primary reflector for the Large Submillimeter Telescope
Chihiro Imamura, Yoichi Tamura, Hiroaki Kawamura, Toshiaki Kimura, Akio Taniguchi, Mikio Kurita
#toXiv_bot_toot

On (pre-) approach spaces within convergence approach spaces
Fr\'ed\'eric Mynard
https://arxiv.org/abs/2506.10951 https://arx…

On (pre-) approach spaces within convergence approach spaces
The purpose of this note is to illustrate a parallel between (pre)topologies when seen among convergence spaces and (pre)approach spaces when seen among convergence approach spaces, that appears to be a more complete parallel than in the traditional presentation of these approach structures. This sheds some light on the reflector from the category of convergence approach spaces to that of approach spaces and even on the structure of approach spaces as such. This point of view allows for a chara…

A Wideband Holographic Array with Azimuth and Elevation Beam Steering for 5G/6G Applications
Hazhir Mohammadi, Amir Saman Nooramin, Homayoon Oraizi
https://arxiv.org/abs/2507.11697

A Wideband Holographic Array with Azimuth and Elevation Beam Steering for 5G/6G Applications
This paper presents the design and fabrication of leaky-wave holograms with anisotropic properties, enabling circular polarization for single-beam radiation in desired directions. Tailored for future terrestrial networks like 5G, 6G, and beyond, the proposed antenna achieves high-gain performance with beam steering in elevation and azimuth over a wide angular range. A planar reflector enhances directivity by suppressing backward modes, while a simple feeding network ensures optimal impedance ma…

This https://arxiv.org/abs/2501.14478 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Alignment and optical verification of DESHIMA 2.0 at ASTE
We developed, characterized, and verified an alignment procedure for the DESHIMA 2.0 instrument, an ultra wide-band spectrometer operating between 200--400 GHz, at the ASTE telescope. To this end, we mounted the warm optics, consisting of a modified Dragonian dual reflector system, on a motor controlled hexapod. Crucial in the alignment procedure is our sky chopper, which allows fast beam switching. It has a small entrance and exit aperture coupling to (cold) sky, which creates a measurable sig…