Coordination polymers have attracted an enormous interest among chemists due to their novel physical and chemical properties. This review describes the role of 4,4'-bipyridine in discovering various coordination polymers with novel topologies that range from one-dimensional to three dimensional. The geometries of coordination polymers of bipy include linear, zigzag, four-fold helices, molecular...

Traditionally the relative positioning and attitude determination problem are treated as independent. In this contribution we will investigate the possibilities of using multiantenna (i.e., triple and quadruple) data, not only for attitude determination but also for relative positioning. The methods developed are rigorous and have the additional advantage that they improve ambiguity resolution ...

The ground state vinylidene–acetylene isomerization was investigated by ab initio molecular electronic structure theory. The coupled-cluster method with single, double, and noniterative inclusion of triple excitations @CCSD~T!#; with single, double, and noniterative inclusion of triple and quadruple excitations @CCSD~TQ!#; and with full single, double, and triple excitations ~CCSDT! were used t...

Abstract We present a study of sample bright ( V ≤ 10 mag) and close d 100 pc) triple–stellar system candidates in the galaxy, consisting eight systems total. Our aim is to determine their actual multiplicity physical properties each stellar component systems. The was analyzed using complex spectrophotometric technique by Al-Wardat that utilizes ATLAS9 line-blanketed plane-parallel model atmosp...

I am sure you’ve heard about the triple aim introduced by the Institute for Healthcare Improvement —improving patient experience, reducing cost, and improving the health of a population. I recently discovered that this is being reconsidered, in light of a crucial missing piece – the people who actually are responsible for the patient experience and healthcare. Now conceptualized as the quadrupl...

BACKGROUND The optimal antiretroviral treatment for patients who have human immunodeficiency virus (HIV) viremia despite treatment with nucleoside reverse-transcriptase inhibitors (nucleoside analogues) remains uncertain. We studied treatment with regimens that combined two nucleoside analogues, at least one of which was new, with the protease inhibitor nelfinavir, the nonnucleoside reverse-tra...

The Steiner quadruple systems of order 16 are classified up to isomorphism by means of an exhaustive computer search. The number of isomorphism classes of such designs is 1,054,163. Properties of the designs—including the orders of the automorphism groups and the structures of the derived Steiner triple systems of order 15—are tabulated. A double-counting consistency check is carried out to gai...

We present the full three dimensionality of an electrostatically calculated stability diagram for triple quantum dots. The stability diagram maps out the favored charge configuration of the system as a function of potential shifts due to gate voltages. For triple dots only a three-dimensional visualization allows for the complete identification of all its components. Those are most notably the ...

Background: Many studies reported that antioxidants such as vitamin E, vitamin C help to scavenge the oxygen radicals throughout the female reproductive tract that might improve the infertility treatment. The aim of this research is to adjust a regimen that is a combination of antioxidant and ovulation induction drugs and evaluation of pregnancy rate. Materials and Methods: This is a clinical s...