BACKGROUND AND AIMS Polishing may increase the surface roughness of composites, with a possible effect on bacterial growth and material properties. This preliminary in vitro study evaluates the effect of three different polishing systems (PoGo polishers, Enhance, Venus Supra) on six direct resin composites (Gradia Direct, Venus, Venus Diamond, Enamel Plus HFO, Tetric Evoceram, Filtek Supreme XT...

Friction and wear tests were performed on AISI 1045 steel specimens with different initial roughness parameters, machined by a creep-feed dry grinding process, to study the friction and wear behavior on a pin-on-disc tester in dry sliding conditions. Average surface roughness (Ra), root mean square (Rq), skewness (Rsk) and kurtosis (Rku) were involved in order to analyse the influence of the fr...

The aim of this study was to characterize prolonged standing and its effect on postural control in elderly individuals in comparison to adults. It is unknown how elderly individuals behave during prolonged standing and how demanding such a task is for them. We recorded the center of pressure (COP) position of 14 elderly subjects and 14 adults while they performed prolonged standing (30 min) and...

Square root plays a major role in applications like computer graphics, image processing. To increase the performance of computation, many algorithms have been proposed to carry out the computation task in hardware instead of software. One very common and relatively quick method for finding the square root of a number is the Newton-Raphson method which requires extensive use of division to produ...

We say that a C∗-algebra A is approximately square root closed, if any normal element in A can be approximated by a square of a normal element in A. We study when A is approximately square root closed, and have an affirmative answer for AI-algebras, Goodearl type algebras over the torus, purely infinite simple unital C∗-algebras etc.

We discuss methods for time-discretization and simulation of squareroot SDEs, both in isolation (CIR process) and as part of vector-SDEs modeling stochastic volatility (Heston model). Both exact and biased discretization methods are covered.

In this paper, we revisit the Computational Square-Root Exponent Problem (CSREP), and give a more generic condition such that CSREP is polynomial-time equivalent to the Computational DiffieHellman Problem (CDHP) in the group with prime order. The results obtained in this paper contain Zhang et al.’s results at IWCC2011. We also analyze the existence of such condition. Although primes satisfying...

This paper presents an undelayed solution to the bearing-only simultaneous localization and mapping problem (SLAM). We employ a square-root iterated Kalman filter for nonlinear state estimation. The proposed technique incorporates a modified Kalman update that is equivalent to a variable-step iterative Gauss-Newton method, and is numerically stable because it maintains a square-root decompositi...

In this paper, we study the consistency of the regularized least square regression in a general reproducing kernel Hilbert spaces. We characterized the compactness of the inclusion map from a reproducing kernel Hilbert space to the space of continuous functions and showed that the capacity based analysis by uniform covering numbers may fail in a very general setting. We prove the consistency an...