Lamukhin A.M.,United Metallurgical Company OMK |
Dubinin I.V.,Technical Office
Metallurgist | Year: 2010
The United Metallurgical Company has begun operation of the first casting-rolling complex in Russia that is designed chiefly for the production of coiled and uncoiled flat-rolled products that are to be used to make electric-welded pipe. A technology for operation of the complex has been developed and a commercial batch of 11-mm-thick plates of strength classes K52 and K56 has been produced for making pipes 1067 mm in diameter. © 2010 Springer Science+Business Media, Inc.
Bravo-Imaz I.,Intelligent Information Systems Unit |
Garcia-Arribas A.,University of the Basque Country |
Gorritxategi E.,Technical Office |
Arnaiz A.,Intelligent Information Systems Unit |
Barandiaran J.M.,University of the Basque Country
IEEE Transactions on Magnetics | Year: 2013
The actual trend in the field of maintenance in mechanical and electrical machinery, points towards the implementation of the so-called proactive maintenance. In this framework, different parameters of the system are monitored so that the current health state of the machinery can be precisely known. The health state of the lubricating oil is within the set of parameters that are to be monitored. Nearly 40% of the total reported malfunctions in heavy machinery are due to failures in lubrication. Among the different parameters that define the state of lubricant oil, viscosity is one of the most important. Lubricant oil prevents moving parts to get into direct contact so, inadequate viscosity may cause malfunctioning and even a fatal breakdown. Besides, the monitoring of the viscosity can help establishing the state of degradation of the lubricating oil. Magnetoelastic sensors based on the magnetoelastic resonance phenomena have been shown to be useful in the determination of viscosity. In this work we describe an experimental prototype to determine the viscosity of lubricant oils using the magnetoelastic resonance. The measurements are done using different commercial oils with viscosities ranging from 32 to 326 cSt. The amplitude of the resonance and the value of the resonance frequency are shown to correlate satisfactorily with the viscosity of the measured oil, demonstrating the possibility of developing a working real-time, on-line viscosity sensor based on this principle. We also show how the temperature effects on viscosity can be taken into account. © 1965-2012 IEEE.
Squeglia N.,University of Pisa |
Bentivoglio G.,Technical Office
International Journal of Architectural Heritage | Year: 2015
A short summary is presented of the studies and the actions of Committees appointed in past 50 years for the Tower of Pisa. The discussion first addresses the attempts carried out during the whole history of the Tower to measure its movements and the efforts made to understand the origin and causes of its inclination. A history of foundation rotation has been also deduced by means of a precise architectural survey, which has led to a diagnosis for the inclination and its increase in time. As a consequence, several hypotheses for its stabilization have been proposed. All the measures for leaning tower stabilization need the application of observational method for their implementation. The observational method is strictly based on a comprehensive monitoring system, both described in the second part of the paper. The aims are to stress the importance of a well-conceived monitoring system and to propose the extension of concept of monitoring to construction history details. The data and actions described are from the work carried out by committees appointed by Italian Government during the second half of 20th century, in particular by the committee chaired by Professor Jamiolkowski, appointed in 1991. The authors have collaborated with this committee since 1993, and they are still in charge of the monitoring and maintenance of the Tower of Pisa. © 2014 Taylor and Francis Group, LLC.
Rahbar N.,Islamic Azad University at Semnan |
Esfahani J.A.,Ferdowsi University of Mashhad |
Fotouhi-Bafghi E.,Technical Office
Solar Energy | Year: 2015
Typical solar stills suffer from their low productivity and it is very important to design an optimum device. CFD simulation can assist engineers to enhance the performance of a solar still for a given cost. In this study, we investigate the ability of a 2-D CFD simulation in computation of heat and mass transfer in a tubular solar still. The results show that there is acceptable agreement between the results of CFD simulation and experimental data reported in the literature. CFD simulation indicates a recirculating zone with a clockwise direction inside the enclosure. The results also imply that the most condensation takes place on the upper side of the glass cover. Moreover, we propose new relations to estimate water productivity, heat and mass transfer coefficients in the tubular solar still. Based on these relations, we suggest characteristic curves to estimate water-productivity in different operational conditions. The results of curves show inverse effect of glass temperature, and direct effect of water temperature on the performance of a tubular solar still. © 2015 Elsevier Ltd.