The majorization relation orders the degree sequences of simple graphs into posets called dominance orders. As shown by Ruch and Gutman (1979) Merris (2002), threshold split form upward-closed sets within they belong to, i.e., any sequence majorizing a or must itself be threshold, respectively. Motivated fact that have characterizations in terms forbidden induced subgraphs, we define class $\ma...

Upward counterfactual thoughts identify how a previous outcome could have turned out better. Research has found that such thoughts are associated with intentions to improve on subsequent performance outcomes. The present dissertation proposes a new self-evaluation model of upward counterfactual thinking which reasons that upward counterfactual thinking is closely tied to self-evaluation and sel...

Polyacrylonitrile (PAN) nanofibers were prepared by a needleless electrospinning method using three rotating fiber generators, cylinder, disc and coil. The effects of the spinneret shape on the electrospinning process and resultant fiber morphology were examined. The disc spinneret needed the lowest voltage to initiate fiber formation, followed by the coil and cylinder. Compared to cylinder, th...

The paper proposes a key constraint language for XML and investigates its associated decision problems. The language is deened in terms of regular path expressions extended with downward and upward wildcards, which can not only move down XML document trees, but also upwards as well. In a uniform syntax it is capable of expressing both absolute keys and relative keys, which are important for hie...