Osaka Institute of Technology

Quasi‐Factorially Closed Subalgebras of Laurent Polynomial Rings

ABSTRACT Let be a domain and the Laurent polynomial ring over . In this paper we study pre‐factorially closed (pfc) and quasi‐factorially closed (qfc) ‐subalgebras of , which generalize the notion of factorially closed subalgebras. We first establish a localization criterion for...

Improvement of Surface Cracks in Aluminum Alloy Strip Casting Using a Grooved Roll in a Vertical-Type High-Speed Twin Roll Caster

A vertical-type high-speed twin roll caster can cast aluminum alloy strip at speeds from 20 to 90 m/min; however, surface cracks occur on the cast strip. In Al-Si alloys, surface cracks are known to occur when the Si content is less than 5 mass%. The condition of the surface crac...

The uniqueness of covers of widely generalized line graphs

As a natural generalization of line graphs, Hoffman line graphs were defined by Woo and Neumaier. Especially, Hoffman line graphs are closely related to the smallest eigenvalues of graphs, and the uniqueness of strict covers of a Hoffman line graph plays a key role in such a stud...

Helical Nanocavity-Driven Upconversion Circularly Polarized Luminescence with Efficient Triplet Dynamics in Poly(methyl methacrylate) Stereocomplexes

Abstract Triplet–triplet annihilation photon upconversion circularly polarized luminescence (TTA-UC-CPL) in solid-state materials remains challenging because the molecular ordering required for chirality often compromises triplet energy transfer and oxygen tolerance. Herein, we r...

Preliminary Classification of Black Writing Pen Inks Using Optical-probing Photoacoustic Measurement by Pulsed Laser Excitation Combined with Machine Learning for Forensic Applications

Abstract We successfully measured the photoacoustic (PA) signals of black inks in solution from marking pens using a combination of optical-probing photoacoustic spectroscopy (OPPAS) with nanosecond pulsed laser excitation. OPPAS is a highly sensitive technique that detects heat...

MUSUBOU-AR: An Open-Source Geospatial AR Framework for Integrating Public GIS Data, Field Authoring, and Disaster Walking Tours

Abstract. Conventional hazard maps, public GIS layers, and disaster education materials are essential resources for community disaster risk reduction, but they do not always support in-situ spatial understanding during field-based training. This paper presents MUSUBOUAR, a public...