The influence of microorganisms from a salt marsh in the surface modification 5083 aluminum alloy (Al-Mg) seawater was evaluated. An immersion test performed for 50 days biotic and abiotic conditions, with electrochemical monitoring surface/cross-section characterization by SEM/EDX TEM after exposure, showed that induced formation homogenous layer on Al-Mg surface. This layer, which proved to b...

Abstract In this paper some experimental determinations on the temperature during milling process of aluminum alloys (5083, 6082 and 7075) were conducted, by using two methods: with contact non-contact, for different feed speeds. For reason, an adequate installation was used, so that can be measure simultaneously. The results are presented graphical dependencies as function speed, each type exp...

It is not uncommon to use profiles to act as energy absorption parts in vehicle safety systems. This work analyses an impact attenuator based on a simple design and discusses the use of a thermoplastic material. We present the design of the impact attenuator and a mechanical test for the prototype. We develop a simulation model using the finite element method and explicit dynamics, and we evalu...

It has been shown that the plastic response of many materials, including some metallic alloys, depends on the stress state. In this paper, we describe a plasticity model for isotropic materials, which is a function of the hydrostatic stress as well as the second and third invariants of the stress deviator, and present its finite element implementation, including integration of the constitutive ...

This paper presents the details of the system we prepare as a participant of the PAN 2014 task on 'Source Retrieval: Uncovering Plagiarism, Authorship, and Social Software Misuse'. Our work is focused on intelligent chunking of suspicious documents and a hybrid approach of query formation. A method based on term frequency and word co-occurrence is proposed to extract query terms from a non-over...