There are only two viable low-energy E6 subgroups: SU(3)C ×SU(2)L ×U(1)Y × U(1)N or SU(3)C × SU(2)L × SU(2)′R × U(1)YL+Y ′ R , which would not erase any preexisting lepton asymmetry of the Universe that may have been created by the decay of heavy singlet (right-handed) neutrinos or any other mechanism. They are also the two most favored E6 subgroups from a recent analysis of present neutral-cur...

A ZME-matrix is a matrix A all of whose positive integer powers are Z-matrices, and whose odd powers are irreducible. We find a combinatorial partial order on the spectral idempotents of a ZME-matrix A which determines the allowable spectral perturbations B for which B is again a ZME-matrix. We apply this result to show that under certain restrictions, the product of two ZME-matrices is a ZME-m...

BACKGROUND In a planned International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) worldwide study on reference intervals (RIs), a common panel of serum samples is to be measured by laboratories from different countries, and test results are to be compared through conversion using linear regression analysis. This report presents a validation study that was conducted in collab...

BACKGROUND Point-of-care glucose meters are used increasingly in semi- and non-professional context. The quality of glucose measurements depends on the quality of the equipment, the quality of use, and the pre-analytical conditions. In this article, a External Quality Assessment Scheme (SKML)-Quality Mark for point-of-care test (POCT) and self-test glucose meters is proposed, assessing analytic...

Unreinforced masonry is that in which the tensile strength of the masonry is taken into consideration in design. Allowable out-of-plane tensile stress values are a function of the mortar type, such as Portland cement/lime mortar vs. masonry cement mortar or type M or S mortar vs. type N mortar. The allowable tensile stress is also a function of the masonry construction, such as tension parallel...

Order types are a well known abstraction of combinatorial properties of a point set. By Mnëv’s universality theorem for each semi-algebraic set V there is an order type with a realization space that is stably equivalent to V . We consider realization spaces of allowable sequences, a refinement of order types. We show that the realization spaces of allowable sequences are universal and consequen...

As an alternative to the oversimplified error schemes currently adopted in establishing quality control (QC) strategies, a complex model was assumed implying (a) the distribution of errors (critical error is regarded as a value discriminating between "effective errors" to be detected and "subcritical errors" which do not interfere with the medical decision whose detection is considered as a fal...

CONTEXT Routine repeat testing of critical values is a long-standing practice in many clinical laboratories; however, its usefulness and necessity remain to be empirically established and no regulatory requirements yet exist for verification of the critical value results obtained by repeat analysis. OBJECTIVE To determine whether repeat testing of critical values is useful and necessary in a ...

The identiication of the needed redexes in a term is an undecidable problem. We introduce a (partially decidable) type assignment system, which distinguishes certain redexes called the allowable redexes. For a well-typed term e, allowable redexes are needed redexes. In addition, with principal typing, all the needed redexes of a normalisable term are allowable. Using these results, we can ident...