In this paper some upper and lower bounds for the greatest eigenvalues of the PI and vertex PI matrices of a graph G are obtained. Those graphs for which these bounds are best possible are characterized.

AIM AND OBJECTIVE To figure out, analyze and assess the effectiveness of powered toothbrush (Braun/Oral-B two-dimensional) and manual toothbrush (Oral-B40 Regular Advantage Plus) on supragingival plaque and gingival health. MATERIALS AND METHODS The efficacy of powered toothbrush to that of manual one was compared by using a randomized clinical trial over a 4 weeks period in controlling plaqu...

The major issue for the wheeled mobile robot is the low level controller gains tuning up especially in the robot competition. The floor surface can be damaged by the robot wheels during the competition, therefore the surface coefficient can be changed over time. PI gains have to be tuned before every match along the competition. In this research, the torque controller is defined and implemented...

Peer Instruction �PI� is a method that creates a more inter­ active lecture environment. Lectures are suspended at regular intervals to offer students short conceptual questions. The questions are generally taken from the material just pre­ sented and are designed to address common misunderstand­ ings among the students. Students are encouraged to work in small groups on these questions to acti...

Many scientific disciplines use n samples to extrapolate information on the species composition of additional unobservable samples. Given a population with unknown species proportions (pi)i≥1, we consider the problem of estimating: i) the number Uλn,r of unseen species with frequency r ≥ 1 in an additional sample of size λn; ii) the probability Vλn,r of discovering at the (λn + n + 1)-th draw a...

Objetivo: Analisar o conhecimento percebido e objetivo de acadêmicos da saúde sobre a vacinação contra sarampo. Método: Estudo descritivo, transversal quantitativo, realizado com 223 enfermagem medicina das Instituições Ensino Superior públicas do município Picos-PI, através questionário on-line. O foi avaliado pelos acadêmicos, avaliou oito quesitos classificado em: adequado (7 8 acertos), reg...