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an extended star is a tree which has only one vertex with degree larger than two. the -center problem in a graph  asks to find a subset  of the vertices of  of cardinality  such that the maximum weighted distances from  to all vertices is minimized. in this paper we consider the -center problem on the unweighted extended stars, and present some properties to find solution.

The One Belt Road Initiative (OBOR) by China presents a grand vision to the world that aims foster cooperation among different countries in various fields such as global trade, international relations, infrastructure development, education, and technology. Also known (BRI), it comprises network of roads, railways, sea routes, all geared toward development humanity. purpose this research is anal...

Familial British dementia (FBD), pathologically characterized by cerebral amyloid angiopathy (CAA), amyloid plaques, and neurofibrillary degeneration, is associated with a stop codon mutation in the BRI gene resulting in the production of an amyloidogenic fragment, amyloid-Bri (ABri). The aim of this study was to assess the distribution of ABri fibrillar and nonfibrillar lesions and their relat...

We report the first observations of the clustering environment of damped Lyman α absorption systems at z ≃ 4. Color selection and photometric redshifts were used to select 44 candidate Lyman-break galaxies brighter than IAB = 25.5 from deep BRI images of the 35 arcmin 2 field containing the quasar BR 0951−04. Multislit spectroscopy of 35 candidate galaxies was performed and 8 of these candidate...

Summary China’s Belt and Road Initiative (BRI), designed to build critical infrastructure coordinate economic growth, is the most significant development initiative in modern history. The BRI has a documented vision for sustainability, including environmental impact assessments responsibility tenets. Despite this, growing body of literature found adverse effects projects on protected land speci...

BACKGROUND Although autistic spectrum disorders (ASD) are a strongly genetic condition certain metabolic disturbances may contribute to clinical features. Metabolism of oxalate in children with ASD has not yet been studied. AIM The objective was to determine oxalate levels in plasma and urine in autistic children in relation to other urinary parameters. METHOD In this cross-sectional study,...

Familial Danish dementia (FDD) is an autosomal dominant neurodegenerative disease clinically characterized by the presence of cataracts, hearing impairment, cerebellar ataxia and dementia. Neuropathologically, FDD is characterized by the presence of widespread cerebral amyloid angiopathy (CAA), parenchymal amyloid deposition and neurofibrillary tangles. FDD is caused by a 10-nucleotide duplicat...