We implement a bottom-up multiscale approach for the modeling of defect localization in C(6n(2))H(6n) islands, i.e. graphene quantum dots with a hexagonal symmetry, by means of density functional and semiempirical approaches. Using the ab initio calculations as a reference, we recognize the theoretical framework under which semiempirical methods adequately describe the electronic structure of t...

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In this work, the cation and anion products of the reactions between platinum clusters produced by laser ablation and the benzene molecules seeded in argon have been studied using a high-resolution reflectron time-of-flight mass spectrometer (RTOFMS). The dominant cation products are [C(6n)H(6n - k)](+) and [Pt(m)(C(6)H(6))(n)](+) complexes, while the dominant anion products are dehydrogenated ...

The queens’ graph Qn has the squares of the n × n chessboard as its vertices, with two squares adjacent if they are in the same row, column, or diagonal. An irredundant set of queens has the property that each queen in the set attacks at least one square which is attacked by no other queen. IR(Qn) is the cardinality of the largest irredundant set of vertices in Qn. Currently the best lower boun...

The Chediak-Higashi syndrome (CHS) has been reported in man, cattle, mink, and mice. CHS humans and cattle have an increased incidence of pyogenic infections, whereas CHS mink are more susceptible to Aleutian disease. Age- and sex-matched groups of CHS mice (mutant strain) and C57 Bl/6N (parent strain) were challenged with Candida albicans, Escherichia coli, Klebsiella pneumoniae, and Staphyloc...