We construct the first known example of a strongly aperiodic set of tiles in the hyperbolic plane. Such a set of tiles does admit a tiling, but admits no tiling with an infinite cyclic symmetry. This can also be regarded as a “regular production system” [5] that does admit bi-infinite orbits, but admits no periodic orbits.

Here we discuss which triangles do, and which don’t, admit a tiling of H,E, and S. These notes are meant to pick up as “Regular Production Systems and Triangle Tilings” [16] leaves off. We pause for a conjecture and some additional nomenclature: Let T be any triangle in X = H,E, S. A configuration by T is a collection of congruent copies of T, for each pair of which meet edge-to-edge and vertex...

We consider multiple tilings of Z by translates of a finite multiset A of integers (called a tile). We say that a set of integers T is an A-tiling of level d if each integer can be written in exactly d ways as the sum of an element of T and an element of A. We find new exponential lower bounds on the longest period of A-tiling as a function of the diameter of A, which rejoin the exponential upp...

This study was aimed at developing a method for measuring the relationship between intellectual capital and project manager competencies. Intellectual capital consist human capital, structural capital and relational capital. Project manager competencies have been evaluated based on IPMA Competence Baseline (ICB) and Project Manager Competency Development Framework (PMCDF) includes knowledge, sk...

The focus of this paper is on the trade-off between cost efficiency and access in the choice of the optimal mix of public and private provision in universal health systems. We model a simple health care market in which the regulator acts as a third payer. Patients need one unit of medical service and differ in the severity of illness. A private and a public hospital are available. The private m...

conclusions in this study, some characteristics that had a positive impact on the success of a manager in a hospital surge situation were identified. these characteristics ought to be taken into account when appointing hospital administrators and designing training programs for hospital administrators with the aim of being better prepared to face disasters. background hospital administrators pl...

Glasgow University School of Dentistry: Principal Investigators: Ashraf F. Ayoub, Professor of Oral & Maxillofacial Surgery Alex Crawford, Chief Executive, RCA Trust Gail Gilchrist, Research Manager, Addictions Team, Greater Glasgow NHS Board Ian Smith, Consultant Psychiatrist, Gartnavel Royal Hospital, Greater Glasgow Primary Care NHS Trust Adrian Bowman, Professor, Dept. of Statistics, Univer...

http://ccn.aacnjournals.org Kimberly Scherr is the nurse practitioner in internal medicine at Misericordia Community Hospital and Health Centre, Edmonton, Alberta. At the time this article was written, she was the nurse practitioner for the cardiovascular intensive care unit at University of Alberta Hospital in Edmonton. Gayle Urquhart is the professional practice leader in nursing at Universit...