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Sökning: WAKA:kon

  • Resultat 51-60 av 286935
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51.
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52.
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53.
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54.
  • Aalipour, Mojgan, et al. (författare)
  • Identification of Factors affecting Human performance in Mining Maintenance tasks
  • 2014
  • Ingår i: Proceedings of the 3rd international workshop and congress on eMaintenance. - Luleå : Luleå tekniska universitet. - 9789174399721 - 9789174399738 ; , s. 71-76
  • Konferensbidrag (refereegranskat)abstract
    • This paper investigates the factors affecting humanperformance in maintenance task in mining sector. Theobjective is identify various factors and to classify them asdriving (strong driving power and weak dependence) anddependent factors (weak driving power and strongdependence). The factors were identified through literaturesurvey and are ranked using mean score of data questionnaire.The reliability of measures is pretested by applyingCronbach’s alpha coefficient to responses to a questionnairegiven to maintenance personnel. The interrelationshipsbetween human factors have been recognized by interpretivestructural modeling (ISM). Further, these factors have beenclassified using matrice d'impacts croises-multiplicationappliqué à un classement (MICMAC) analysing. This casestudy will figure out the factors affecting human performancefor deriving maintenance management insights to improveproductivity in the mining sector. Further, this understandingmay be helpful in framing the policies and strategies formining industry. Temperature, lighting, documentation,communication and fitness are driving factors. Moreover,Work layout, tools availability, complex tasks, time pressure,safety, boss decisions, training, fatigue and motivation havestrong driving power as well as high dependencies and itcomes under the category of linkage factors.
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55.
  • Aalipour, Mojgan, et al. (författare)
  • Work place factors effect on maintainability in challenging operating conditions
  • 2015
  • Ingår i: 2015 IEEE International Conference on Industrial Engineering and Engineering Management (IEEM). - Piscataway, NJ : IEEE Communications Society. - 9781467380669 - 9781467380669 ; , s. 767-771
  • Konferensbidrag (refereegranskat)abstract
    • Some industries such as mining industry create complex and challenging work place for maintenance crews. For example in an underground mine, for some machines, heavy maintenance tasks must be performed on site in a limited workspace in a harsh environment, including dust and improper illumination. Such operating conditions can increase the health, safety, and environment (HSE) risk, reduce the availability of the machines and increase the life cycle cost of equipment. A review of current mining equipment design and maintenance procedure confirms that considerable reduction in HSE risk, as well as substantial cost savings, can be achieved by considering human factors. This study discusses the effect of workplace factors on the maintainability of mining equipment. It presents the results from questionnaires on the effect of work place factors on maintainability performance given to maintenance staff at two mines, one in northern Sweden and the other in Iran.
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56.
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57.
  • Aalto, Susanne, 1964 (författare)
  • Astrochemistry and star formation in nearby galaxies: From galaxy disks to hot nuclei
  • 2016
  • Ingår i: EAS Publications Series. - : EDP Sciences. - 1633-4760 .- 1638-1963. - 9782759820221 ; 75-76, s. 73-80
  • Konferensbidrag (refereegranskat)abstract
    • Studying the molecular phase of the interstellar medium in galaxies is fundamental for the understanding of the onset and evolution of compact and extended star formation, and of the growth of supermassive black holes. Molecular line emission is an excellent tracer of chemical, physical and dynamical conditions in the cold neutral gas. Key molecules in extragalactic studies are e.g. HCN, HCO+, HC3N, SiO, CH3OH, H2O. Furthermore, we can use IR excited molecular emission to probe the very inner regions of luminous infrared galaxies allowing us to get past the optically thick dust barrier of the compact obscured nuclei where lines of CO, HCN and HCO+ in their vibrational ground state (?=0) may be self-absorbed. Finally, molecular outflows and their chemistry are briefly discussed-including new ALMA results on for example the outflow of the lenticular galaxy NGC1377 and a study of the chemistry of the outflow of the quasar Mrk231.
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58.
  • Aalto, Susanne, 1964 (författare)
  • Chemistry in luminous AGN and starburst galaxies
  • 2008
  • Ingår i: Proceedings of "Science with the Atacama Large Millimeter Array", eds. R. Bachiller and J. Cernicharo, Madrid, 13-17 Nov 2006, Springer. - 9781402069345 ; , s. 273-278
  • Konferensbidrag (refereegranskat)
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59.
  • Aalto, Susanne, 1964 (författare)
  • Chemistry in the Dense Molecular Gas of Starburst Galaxies and AGNs
  • 2006
  • Ingår i: In "Astrochemistry: Throughout the Universe: Recent Successes and current Challenges". Proc. of 31st Symp. of the IAU, Pacific Grove, California, Sept. 2005, eds. D.C. Lis, G.A. Blake, E. Herbst, Cambridge University Press. ; , s. 261-270
  • Konferensbidrag (refereegranskat)
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60.
  • Aalto, Susanne, 1964 (författare)
  • Galaxies and Galaxy Nuclei: From Hot Cores to Cold Outflows
  • 2015
  • Ingår i: 4th ALMA Science Conference on Revolution in Astronomy with ALMA: The Third Year, Tokyo, Japan, 8-11 December. - 9781583818831 ; 499, s. 85-93
  • Konferensbidrag (refereegranskat)abstract
    • Studying the molecular phase of the interstellar medium in galaxies is fundamental for the understanding of the onset and evolution of star formation and the growth of supermassive black holes. We can use molecules as observational tools exploiting them as tracers of chemical, physical and dynamical conditions. In this short review, key molecules (e.g. HCN, HCO+, HNC, HC3N, CN) in identifying the nature of buried activity and its evolution are discussed including some standard astrochemical scenarios. Furthermore, we can use IR excited molecular emission to probe the very inner regions of luminous infrared galaxies (LIRGs) allowing us to get past the optically thick dust barrier of the compact obscured nuclei. We show that the vibrationally excited lines are important probes of nuclei where lines of CO, HCN and HCO+ in their vibrational ground state (v=0) may be self-absorbed. Finally, molecular outflows are briefly discussed-including the new ALMA discovery of a highly collimated (jet-like) reversed molecular outflow in the lenticular, extremely radio-quiet galaxy NGC1377.
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