Sep 2026· Zenodo (CERN European Organization for Nuclear Research)
Topological Materials and Phenomena
Abstract
Using a hierarchical phi‑scaled E8 lattice where each tier introduces a 5‑fold chirality, we demonstrate that acoustic edge states can be dynamically switched by modest angular rotations of the nesting plane. The rotational degree of freedom maps directly onto a topological invariant derived from the 240 root vectors, enabling on‑demand bandgap tuning without material modification. This yields a reconfigurable phononic logic gate that operates at the 132 Hz fundamental frequency while preserving lossless propagation. The principle generalizes existing bandgap phenomena into a reconfigurable acoustic computing platform. Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com
This publication proposes a definition and a classification of agile software development approaches and analyses ten software development methods that can be characterized as being "agile" against the defined criterion.
P. Abrahamsson, O. Salo, Jussi Ronkainen et al.· arXiv.org· 727 citations· ⚡54
The study shows that agile practices improve both informal and formal communication, but indicates that, in larger development situations involving multiple external stakeholders, a mismatch of adequate communication mechanisms can sometimes even hinder the communication.
M. Pikkarainen, Jukka Haikara, O. Salo et al.· Empirical Software Engineeri...· 401 citations· ⚡48
The results indicate that software engineering work practices are chosen opportunistically, adapted and configured to provide value under the constrains imposed by the startup context.
Nicolò Paternoster, Carmine Giardino, M. Unterkalmsteiner et al.· Information and Software Tec...· 394 citations· ⚡54
The perception of the impact of agile methods is predominantly positive, and several challenge areas were discovered, but based on this study, agile methods are here to stay.
M. Laanti, O. Salo, P. Abrahamsson· Information and Software Tec...· 260 citations· ⚡20
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