High-level ab initio molecular-orbital methods have been employed to determine the relative stability among four neutral and anionic B20 isomers, particularly the double-ring tubular isomer versus three low-lying planar isomers. Calculations with the fourth-order Moller-Plessset perturbation theory [MP4(SDQ)] and Dunning's correlation consistent polarized valence triple zeta basis set as well a...

Let G be a finite group and let k be a field. Our purpose is to investigate the simple modules for the double Burnside ring kB(G,G). It turns out that they are evaluations at G of simple biset functors. For a fixed finite group H, we introduce a suitable bilinear form on kB(G,H) and we prove that the quotient of kB(−, H) by the radical of the bilinear form is a semi-simple functor. This allows ...

A conjecture of Beauville and Voisin states that for an irreducible symplectic variety X, any polynomial relation between classes of divisors and the Chern classes of X which holds in cohomology already holds in the Chow groups. We verify the conjecture for a very general double EPW sextic.

DORIS first came into operation in 1973 as a double ring. Later on it was rebuilt as a single ring, and the maximum energy was increased from 3.5 GeV to 5.6 GeV. The experience with the double ring is briefly described, and that with the single ring in more detail. Emphasis is put on those topics which are important for the design of future storage ring colliders, DORIS II is also operating as ...

Abstract We study sign changes and non-vanishing of a certain double sequence Fourier coefficients cusp forms half-integral weight.

Vortex rings were generated by driving pistons within circular cylinders of inner diameter D = 72.8 mm at a constant velocity U0 over a distance L = D. The Reynolds number, U0L/(2m), was 2500. The flow downstream of circular and inclined exits was examined using volumetric 3-component velocimetry (V3V). The circular exit yields a standard primary vortex ring that propagates downstream at a cons...

The sterols are naturally occurring alcohols which consist basically of the steroid skeleton (cyclopentanoperhydrophenanthrene ring system with two angular methyl groups) and which vary in the number of cyclic double bonds. T o the ring system is attached an alkyl side-chain which also may have double bonds. The conventional representation of the sterol skeleton with numbering is shown in Fig. ...

background vascular ring is less than 1% of congenital heart disease. double aortic arch (daa) is the most common form of it.  its detecting is important because of the effects of pressure on the esophagus and trachea. case report in this study, three children suffering from double aortic arch with symptoms of dysphagia and recurrent aspiration, which in two cases had led to cardiac arrest, wer...

In the title mol-ecule, [Fe(C(5)H(5))(C(16)H(12)N)], the cyclo-penta-dienyl rings are approximately eclipsed and the inter-planar angle is 0.8 (7)°. The Fe atom is slightly closer to the substituted cyclo-penta-dienyl ring, with an Fe⋯centroid distance of 1.639 (2) Å, compared with 1.645 (2) Å for the unsubstituted ring. The C=N double bond is essentially coplanar with the substituted cyclo-pen...

Ring signature enable a user to sign a message on behalf of the ring, without revealing the actual signer. Constant-size ring signature is the ring scheme that the size of the signature does not grow with the size of the ring(or group), so it is practical for large rings. In this paper we use the Collision Resistant Accumulator from bilinear pairing to construct an identity-based ring signature...