Introduction: To enhance the dose to tumor, the use of high atomic number elements has been proposed. Objective: The aim of this study is to investigate the effect of gold nanoparticle distribution on dose enhancement in tumor when the tumor is irradiated by typical monoenergetic X-ray beams by considering homogeneous and inhomogeneous distributions of gold nanoparticles (GNPs)...

Non-stationary forced oscillations (FOs) have been observed in power system operations. However, most detection methods assume that the frequency of FOs is stationary. In this paper, we present a methodology for analysis non-stationary FOs. Firstly, Fourier synchrosqueezing transform (FSST) used to provide concentrated time-frequency representation signals allows identification and retrieval si...

Objectives: To identify predictors of operative and postoperative mortality and of functional reversibility after aortic valve replacement (AVR) in patients with aortic stenosis (AS) and severe left ventricular (LV) systolic dysfunction. Methods and results: Between 1990 and 2000, 155 consecutive patients (mean (SD) age 72 (9) years) in New York Heart Association (NYHA) heart failure functional...

ion of conceptual entities (i.e. codes into categories, and categories into concepts) entails the inheritance of relationships between codes (those identified from the empirical data) by more abstract conceptual entities, i.e. categories abstracted from codes inherit relationships identified between the codes. This way, relationships between categories derive from relationships between the code...

We study real Campedelli surfaces up to real deformations and exhibit a number of such surfaces which are equivariantly diffeomorphic but not real deformation equivalent.

Let G be a simple graph on vert ices having a maximum matching M. The deficiency def(G) of G is the number of M-unsaturated vertices in G. The vertex clique covering number vcc(G) of G is the smallest number of cliques (complete subgraphs) needed to cover the vertex set of G. In this determine def(G) and vcc(G) for the case when G is a tree with each vertex having degree 1 or k.