This book constitutes the refereed proceedings of the 30th Euro Mini-Conference, EmC-ONS 2014, held in Aveiro, Portugal, in February 2014. The 13 revised full papers presented were carefully reviewed and selected from 70 submissions. The papers are organized in topical sections on dynamical systems; optimization and applications; modeling and statistical techniques for data analysis.

Many people of Portuguese descent take pride in claiming that the word "saudade" is untranslatable. In reality, we come close with a melding of bittersweet nostalgia, bone- deep longing, and an endless yearning for what one can never have again -- or indeed may never have had. Adelaide Freitas dipped her pen in saudade to tell of family separation and bonds that never loosen. In her authentic Azorean voice, she recounts the immigrant experience and centrifugal impulses that force people apart in spite of their desperation to cling to one another. In their sensitive rendering, the translators have captured the nuances of Freitas's novel Smiling in the Darkness, with special care for those who have her native Language in their heritage and heartfelt saudade for its loss.