We show that the structure R of recursively enumerable degrees is not a Σ1-elementary substructure of Dn, where Dn (n > 1) is the structure of n-r.e. degrees in Ershov hierarchy.

In the title compound, [Fe(C(5)H(5))(C(21)H(19)N(2)O(3))], both pyrrol-idine rings of the pyrrolizine substructure show an envelope conformation. In the ferrocenyl moiety, the unsubstituted cyclo-penta-dienyl ring is disordered over two orientations with site occupancies of 0.64 (2) and 0.36 (2). In the pyrrolizine ring, one C atom is disordered over two positions, with site occupancies of 0.71...

pressurized injection operation means the pressurized injection of a liquid or solution into pore of a mass of soil or stone and/ or cavity between them and built structures. the injected mortar mustconstitute a soil and/ or jel- like matter inside the cavites, and/ or the operations of the injection must cause sedimentation of the solid matter suspending in these cavites. the primary purpose o...

A Hodge structure V of weight k on which a CM eld acts de nes, under certain conditions, a Hodge structure of weight k 1, its half twist. In this paper we consider hypersurfaces in projective space with a cyclic automorphism which de nes an action of a cyclotomic eld on a Hodge substructure in the cohomology. We determine when the half twist exists and relate it to the geometry and moduli of th...

Although numerous studies of individual galaxy clusters have demonstrated the presence of significant substructure, previous studies of the distribution of masses of galaxy clusters determined from optical observations have failed to explicitly correct for substructure in those systems. In this Letter I present the distributions of velocity dispersion, mean separation, and dynamical masses of c...

PURPOSE To compare marginal and internal gaps of zirconia substructure of single crowns with those of three-unit fixed dental prostheses. MATERIALS AND METHODS Standardized Co-Cr alloy simulated second premolar and second molar abutments were fabricated and subsequently duplicated into type-III dental stone for working casts. After that, all zirconia substructures were made using Lava™ system...

Biological and chemical objects in bioinformatics are often linked to structures: proteins and DNAs to their sequences, small-molecule compounds to their chemical structures, and pathways to their network structures. Associations among these objects, such as interactions between proteins and compounds, are of particular interest in the field, and these associations are often given as a graph: t...

European population genetic substructure was examined in a diverse set of >1,000 individuals of European descent, each genotyped with >300 K SNPs. Both STRUCTURE and principal component analyses (PCA) showed the largest division/principal component (PC) differentiated northern from southern European ancestry. A second PC further separated Italian, Spanish, and Greek individuals from those of As...

Earth-mass dark matter “microhalos” may be the first objects to collapse and virialize in the early universe. Their ability to survive the hierarchical clustering process as substructure in the larger halos that form subsequently has implications for direct and indirect dark matter detection experiments. We present here the large N -body simulation of early substructure in a supersymmetric cold...

The Cold Dark Matter (CDM) model for galaxy formation predicts that a significant fraction of mass in the dark matter haloes that surround L ∼ L∗ galaxies is bound in substructures of mass 104–107M⊙. The number of observable baryonic substructures (such as dwarf galaxies and globular clusters) falls short of these predictions by at least an order of magnitude. We present a method for searching ...