A supersymmetric model with two copies of the Standard Model gauge groups is constructed in the gauge mediated supersymmetry breaking scenario. The supersymmetry breaking messengers are in a simple form. The Standard Model is obtained after first step gauge symmetry breaking. In the case of one copy of the gauge interactions being strong, a scenario of electroweak symmetry breaking is discussed...

We show that it is #P-complete to count the number of bases of matroids representable over a fixed infinite field or fields of fixed characteristic.

Let M be an n × n square matrix and let p(λ) be a monic polynomial of degree n. Let Z be a set of n × n matrices. The multiplicative inverse eigenvalue problem asks for the construction of a matrix Z ∈ Z such that the product matrix MZ has characteristic polynomial p(λ). In this paper we provide new necessary and sufficient conditions when Z is an affine variety over an algebraically closed field.

introduction: penetrating cardiac injuries generally occur secondary to gunshot or stab wounds and have a high mortality rate. they are rare and often fatal in children. when a foreign object penetrates the myocardium, it is dangerous to remove it, suddenly, and should be removed gradually to prevent excessive bleeding. case report: we report a case of an unusual penetrating cardiac injury in a...

Background and Objective: A needle stick injury is a percutaneous piercing wound typically set by aneedle point, but possibly also other sharp instruments or objects. Needle injuries are more commonamong health workers during night shifts, for less experienced people, fatigue, high work load, highpressure, perception of risk can all increase the chances injury. The present study wasconducted wi...

BACKGROUND Facial soft tissue injury can be one of the most challenging cases presenting to the plastic surgeon. The life quality and self-esteem of the patients with facial injury may be compromised temporarily or permanently. Immediate reconstruction of most defects leads to better restoration of form and function as well as early rehabilitation. OBJECTIVES The aim of this study was to pres...

Hadronic final states with a hard isolated photon are studied using data taken at centre-of-mass energies around MZ with the OPAL detector at LEP. The strong coupling αS is extracted by fitting event shape variables for the reduced centre-of-mass energies ranging from 20 GeV to 80 GeV, and the energy dependence of αS is studied. Combining all the values using different event shape variables and...

Evidence from the Finnish Twin Registry (e.g., Rose et al., 1988) shows that adult monozygotic (MZ) twins are more similar, within pairs, in personality if the cotwins are presently cohabiting or in frequent contact than if they are seldom in contact. Results of a follow-up study led Kaprio et al. (1990) to conclude that "'changes in social contact between monozygotic cotwins precede (and causa...

We study the perturbative QCD series for the hadronic width of the Z boson. We sum a class of large “π2 terms” and reorganize the series so as to minimize “renormalon” effects. We also consider the renormalization schemescale ambiguity of the perturbative results. We find that, with three nontrivial known terms in the perturbative expansion, the treatment of the π2 terms is quite important, whi...