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A graph obtained by deleting a Hamming code of length $$n= 2^r - 1$$ n = 2 r - 1 from a n-cube $$Q_n$$ Q n is called as a Hamming shell. It is well known that a Hamming shell is regular, vertex-transitive, edge-transitive and distance preserving (Borges and Dejter in J Comb Math Comb Comput 20:161–173, 1996; Dejter in Discrete Math 124:55–66, 1994; J Comb Des 5:301–309, 1997; Discrete...
A single mode fiber is used in this study, in a Y-coupler mode; the mirror tip which is coated with bromothymol blue (BTB), homogeneously mixed in polyvinyl alcohol (PVA) matrix. The setup operated at 1550 nm, and was used to sense extremely small quantities of ammonia gas, at room temperature. The sensor was able to detect ammonia in the range of 1.5 ppm to 150 ppm; with observed sensitivity in terms...
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