The barnacle Chthamalus fragilis is found along the US Atlantic seaboard historically from the Chesapeake Bay southward, and in the Gulf of Mexico. It appeared in New England circa 1900 coincident with warming temperatures, and is now a conspicuous member of rocky intertidal communities extending through the northern shore of Cape Cod, Massachusetts. The origin of northern C. fragilis is debate...

The new mixed-metallic phase, niobium vanadium nona-selenide, (Nb(2-x)V(x))Se(9) (0.18≤ x ≤ 0.59) is isostructural with monoclinic V(2)Se(9). The structure is composed of chains of bicapped trigonal-prismatic [MSe(8)] units. The metal (M) site is occupied by statistically disordered Nb [0.706 (5)] and V [0.294 (5)] atoms. Two trigonal prisms are linked by sharing a recta-ngular face composed of...

consider an n × n matrix polynomial p(λ). a spectral norm distance from p(λ) to the set of n × n matrix polynomials that havea given scalar µ ∈ c as a multiple eigenvalue was introducedand obtained by papathanasiou and psarrakos. they computedlower and upper bounds for this distance, constructing an associated perturbation of p(λ). in this paper, we extend this resultto the case of two given di...

Two new species of subgenus Tipula (Vestiplex) Bezzi, 1924, Tipula (Vestiplex) leigongshanensis Men & Young, sp. n. and Tipula (Vestiplex) maoershanensis Men & Young, sp. n. are described and illustrated. Tipula (Vestiplex) bicalcarata Savchenko, 1965 is redescribed and illustrated based on additional morphological characters. Partial mitochondrial cytochrome oxidase subunit I (COI) sequences o...

We show how superconductors can be used to couple, initialize, and read out spatially separated spin qubits. When two single-electron quantum dots are tunnel coupled to the same superconductor, the singlet component of the two-electron state partially leaks into the superconductor via crossed Andreev reflection. This induces a gate-controlled singlet-triplet splitting which, with an appropriate...

Analyses of the nuclear DNA marker 28S confirm the distinctness of the recently erected stonefly genus Zwicknia Murányi 2014, which encompasses the species until recently referred to as 'Capnia bifrons.' Two new species are described and illustrated with line drawings: Z. westermanni Boumans & Murányi, sp. n. from Germany and France, and Z. komica Murányi & Boumans, sp. n. from the Komi Republi...

Over the last thirty years, various combinatorial aspects of finite metric spaces have been studied in the context of phylogenetic-tree reconstruction. A starting point was the following observation: Given a metric D : X × X → R representing the approximative genetic distances D(x, y), . . . between the members x, y, . . . of a finite collection X of taxa, it was shown in [15] that the followin...

A group distance magic labeling or aG-distance magic labeling of a graph G = (V, E) with |V | = n is a bijection f from V to an Abelian group G of order n such that the weight w(x) = ∑y∈NG (x) f (y) of every vertex x ∈ V is equal to the same element μ ∈ G, called the magic constant. In this paper we will show that if G is a graph of order n = 2p(2k + 1) for some natural numbers p, k such that d...