38–41). However, after consulting with the parents, the underlying issue was identified as the frequent work-related travel of the father and the preoccupation of the mother with caring for an infant, which made maintaining the attendance of the child challenging. To address this issue, the ...
Rather, the patient must travel to the site of the PET system where the needed radioisotopes can be produced and used immediately. Because of the sheer size, mass and expense of building and operating just the cyclotron (which is only one element of a PET system), there are relatively few...
Transport costs and travel times are estimated using the network model and observed data whenever available. Two geographical and economic context binary variables are added, one describing if the OD pair has a trade agreement and the other for the existence of a land border between trading ...
Third, video-conferencing and virtual meetings could reduce short and medium haul travel (<1500 km). However, in the study of Alonso et al. [9], where the structure of air traffic and its distribution among the different countries in the European Union is analyzed, results indicate that in...