Artificial honeycomb lattices with Dirac cone dispersion provide a macroscopic platform to study the massless Dirac quasiparticles and their novel geometric phases. In this paper, a quadruple-degenerate state is achieved at the center of the Brillouin zone in a two-dimensional honeycomb lattice phononic crystal, which is a result of accidental degeneracy of two double-degenerate states. In the ...

AIM Quadruple test is used for Down's syndrome screening in the second trimester of pregnancy. The aim of this study was to investigate differences in quadruple test parameters between pregnancies achieved by assisted reproductive treatments (ART) and spontaneous conception. MATERIALS AND METHODS We retrospectively compared levels of alfa-fetoprotein (AFP), unconjugated Estriol (uE3), inhibin...

A Steiner quadruple system of order v is a set X of cardinality v, and a set Q, of 4-subsets of X, called blocks, with the property that every 3-subset of X is contained in a unique block. A Steiner quadruple system is resolvable if Q can be partitioned into parallel classes (partitions of X). A necessary condition for the existence of a resolvable Steiner quadruple system is that v = 4 or 8 (m...

We study a quadruple of interrelated subexponential subsystems of arithmetic WKL 0 , RCA 0 , IΔ0, and ΔRA1, which complement the similarly related quadruple WKL0, RCA0, IΣ1, and PRA studied by Simpson, and the quadruple WKL 0 , RCA 0 , IΔ0(exp), and EFA studied by Simpson and Smith. We then explore the space of subexponential arithmetic theories between IΔ0 and IΔ0(exp). We introduce and study ...

eradication rate of helicobacter pylori using furazolidone (fur) versus clarithromycin (cla) in two weeks quadruple therapy in du patients

. The Quadruple Tank system has been used to illustrate both traditional and advanced multivariable control strategies and can be utilized as an educational tool in teaching advanced multivariable control techniques and provide interesting challenges in the control design. The main feature of the Quadruple Tank System is the flexibility in positioning one of its multivariable zeros on either ha...