7 articles in this issue
T Andrade,K Crivelaro,S Neto,A Lima
The occurrence of heavy oils in the world has increased substantially and points favorable to investment in exploration of mineral deposits and consequently, for the development of new technologies. Heavy oil has a high viscosity that varies from 100 to 1... see more
B Araújo,T Maciel,J Carrasco,E Vilar,A Silva
This paper presents a study of susceptibility to hydrogen embrittlement of API 5L X80 steel welded joints by SMAW and GTAW processes. By varying the consumables used and the use of the same interpass temperature three different welded joints were obtained... see more
J Borges,A Silva,C Araújo,E Fernandes,R Pimentel,A Santiago
Most rotating machines, especially those mounted on flexible shafts and bearings when it starts operating, tend to pass through critical speeds, ie speeds that can cause the system to resonate the mechanical structure. Hence it is a constant concern for f... see more
P Salac,M Starý
In this article we investigate the problem of shape optimization of the cooling cavity of the plunger used in the forming process in the glass industry. A rotationally symmetrical system consisting of the mould, the glass piece, the plunger and the plunge... see more
A Polupanov,S Evdochenko
We demonstrate an explicit numerical method for accurate solving the eigenvalue problem for some systems of ordinary differential equations, in particular, those describing electron and hole bound states in semiconductor quantum wells with polynomial pote... see more
G Acciani,A Dimucci,L Lorusso
The use of the piezoelectric effect to convert ambient vibration into useful electrical energy constitutes one of the most studied areas in Energy Harvesting (EH) research. This paper presents a typical cantilevered Energy Harvester device, which relates ... see more
M Ilie
The complexity of natural systems often prohibits our understanding of governing principles of the systems. The prediction of flow and solute transport through large-scale geological systems is challenging, since accurate predictions involves a detailed c... see more