[This corrects the article DOI: 10.2141/jpsa.2025023.].

This paper proposes a third-order Butler matrix to extend orbital angular momentum (OAM) multiplexing to orders that are multiples of three for short-range wireless communications in fog/edge computing applications. The proposed network employs a single-layer microstripline structure, facilitating simplified fabrication and miniaturization. To validate its performance, we fabricated a prototype and conducted network evaluations and OAM multiplexing transmission experiments at a center frequency of 2.5 GHz. At this frequency, the prototype exhibited key characteristics required for OAM mode generation: low insertion loss (< 0.44 dB), well-balanced amplitude (error < 0.41 dB) and precise phase characteristics among the ports (error < 1.7 deg). Furthermore, transmission experiments were conducted using four array configurations under various conditions to evaluate system performance. In particular, the circularly polarized array demonstrated notable robustness compared to a co-polarized array, maintaining high mode orthogonality and a high achievable rate even under axial rotation between the transmitting and receiving arrays. This work contributes not only to the simplification, miniaturization, and low-power consumption of networks for edge devices but also to enhancing the scalability of seamless communication for fog/edge computing by enabling flexible multiplexing tailored to adaptive use cases.

We report a significant breakthrough in enhancing the performance of MgB₂ superconductors by engineering novel nanoscale defects using spark plasma sintering (SPS). By incorporating nanoscale MgB2O particles via silver addition, carbon doping, and magnesium excess, we introduce a transformative approach to defect design. This innovation yields exceptional material performance, characterized by a self-field critical current density (Jc) of 1.2 MA/cm2 at 10 K, a single peak in the normalized pinning force density diagram [f(b) = F/Fmax(B/Birr)] at b = 0.3, and the exceptional trapped field values of 4.21 T at 11 K (for a 20 mm diameter and 5.5 mm thick single MgB2 bulk), and 5 T at 15 K and 6 T at 10 K of a triple-stacked compact bulk MgB2 cryo-magnet. These remarkable advancements highlight a novel paradigm in nanoscale defect engineering, with far-reaching implications for superconductors, nanomaterials, and advanced energy systems.

Sake is a traditional Japanese alcoholic beverage that contains ethyl caproate (EC), a compound that enhances its economic value due to consumer preference. Procyanidins are polyphenolic compounds found in fruits such as apples, with procyanidin B2 (PB2) commonly used as a standard compound. Detecting EC and PB2 directly in intact or simply prepared beverages (e.g., dilution without organic solvent) requires liposomes as a model system. In this study, we focused on liquid-ordered/liquid-disordered liposomes, particularly reverse-domain liposomes, which were identified by fluorescence microscopy. EC and PB2 were found to increase and decrease the ratio of reverse-domain liposomes, respectively. The observation of cell-sized liposomes, combined with calibration curves, enabled a simplified analysis of EC and PB2. This approach has potential applications in the development, optimization, and practical implementation of food analytical methods for routine monitoring of beverage quality. These findings also provide a foundation for further studies on the biophysical and physiological properties of EC and PB2.