In this study, we present the detailed investigation of the influence of the etching medium (acidic or basic Piranha solutions) and the etching time on the morphology and surface relief of ultrafine grained (UFG) and coarse grained (CG) titanium. The surface relief and morphology have been studied by means of scanning electron microscopy (SEM), atomic force microscopy (AFM), and the spectral el...

This paper presents a mechanism to enrich logging as required in TCSEC [1] document to detect and stop possible intrusions based on typical attacks and to protect the sensible audit data from deletion/modification even in root compromise situation. After installing Piranha Audit, administrators will have a solid infrastructure for improving security and resistance to penetration, with only mode...

Revisions of two new species groups of the genus Agra Fabricius are presented with the following species described as new: pusilla group - Agra cruciariasp. n. (Brazil), Agra gracesp. n. (Ecuador,Perú), Agra maxsp. n. (Brazil), Agra minasianussp. n. (Brazil),Agra notpusillasp. n. (Brazil), Agra pseudopusillasp. n. (Brazil); piranha group - Agra cesp. n. (Perú), Agra risserisp. n. (Bolivia,Brazi...

The objective of this work was to evaluate the bioaccumulation mercury in 13 species fish with different eating habits, captured Três Marias Reservoir, São Francisco Basin, from March 2012 April 2013. results obtained showed that carnivorous habit presented highest average concentrations muscle, especially Serrasalmus brandtii (pirambeba) and Pygocentrus piraya (piranha), 0.4147 ± 0.2744 μg g-1...

Heterogeneous integration of functional oxides with ultra-wide bandgap (UWBG) semiconductors is desired for the realization novel hybrid systems applicable to a wide array commercial electronics and defense applications. In this work, we demonstrate growth crystalline SrTiO3 (STO) thin films on high-electron-mobility transistor (HEMT) heterostructures based an emergent UWBG semiconductor ScAlN,...

This paper provides a novel meta-heuristic optimization algorithm for solving continuous problems efficiently in the field of numerical and engineering optimization: Piranha Foraging Optimization Algorithm (PFOA). The is inspired by flexible mobile foraging behaviour piranha swarm divides their behavior into three patterns: localized group attack, bloodthirsty cluster attack scavenging foraging...

Background. “Polyetheretherketone (PEEK)” is a biocompatible, high-strength polymer that well-suited for use in dental applications due to its unique properties. However, achieving good adhesion between PEEK and hydrophilic materials such as adhesives or cement can be challenging. Also, this hydrophobicity may affect the of an implant material. Surface treatment conditioning often necessary imp...