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This study examines the linguistic variation of the Bidayuhic language in Tayan Hulu, West Kalimantan, Indonesia, through a computational dialectological approach using Gabmap. This study applies Levenshtein Distance to measure lexical and phonological differences in six observation sites, analyzing 491 lexical items. The findings show that the Bidayuhic language forms a linguistic continuum, where dialectal variation is not entirely aligned with geographical boundaries. Instead, lexical and phonological differences are influenced by language contact, social mobility, and cultural interaction. This study identifies the merger of the Proto-Malayo-Polynesian (PMP) phonemes R and l into /r/, /ɣ/, and /h/, reflecting phonological innovations in the Bidayuhic language. Furthermore, ablaut in verb morphology is observed, distinguishing between transitive and intransitive verb forms. Cluster analysis via Multidimensional Scaling (MDS) and probabilistic clustering revealed two main groups, confirming that variation is gradual rather than regionally segmented. Despite adding 0.8 probabilistic disturbances, the clustering remained stable, validating the effectiveness of Gabmap in dialect classification. These results emphasize that Bidayuhic variation is shaped more by sociolinguistic interactions than geographical factors. This study highlights the role of Gabmap in linguistic mapping, offering a methodological model for mapping local languages in Indonesia.

An experimental investigation has been carried out to investigate the rheological properties of graphene / carbon nanotube hydrogenated oil based biodegradable drilling fluid at different nanoparticle loadings. The rheological behaviours of interest in this investigation are the viscosity and shear stresses of two different nanofluids respectively. The limiting parameters in this study are 25 ppm, 50 ppm and 100 ppm weight concentration at operating temperature ranging from 30°C to 50°C. Both nanofluids are subjected to shear rate ranging from 0 - 140 s-1 for comparison of rheological behaviours. Both samples' viscosity reduces to base fluid's viscosity value at higher shear rate with carbon nanotube-hydrogenated oil yielding higher viscosity compared to graphene-hydrogenated oil for all nanoparticle loadings at lower shear rate. Shear stress analysis also shows similar results with carbon nanotube based samples showing higher stress between the two at all particle loadings. Both samples show Newtonian behaviour that is similar to base fluid even at higher particle loadings. Analysis revealed both nanofluids yields close to zero yield stress even with the presence of graphene or carbon nanotube particles. The significance of this study shows that addition of low nanomaterials for enhancement of drilling fluids can improve its thermophysical properties without compromising the quality of drilling fluids such as viscosity and shear stress properties.