An optimization problem regarding water removal in the press section of a paper machine is considered in this work. The proposed model tries to minimize a cost function comprising the replacement of the felts in the press section, the cost of energy to operate the press and the cost of energy in the drying section, while satisfying the constraints of water mass balance in the process. The model is classified as a mixed-integer nonlinear program (MINLP) in which the most important decisions are: a) the sequence of paper to produce or when to produce the paper; b) the need to exchange the felts; and c) when to exchange the felts. Numerical examples are presented to illustrate the performance of the model.

A epilepsia primária da leitura é forma rara de epilepsia reflexa, na qual a leitura age como estímulo específico para o desencadeamento de crises. Os autores relatam o caso de um paciente do sexo masculino, com 18 anos de idade, apresentando há um ano abalos mioclônicos da mandíbula provocados exclusivamente pela leitura. Ein um episódio no qual o paciente prosseguiu a leitura, os abalos se seguiram de crise tônico-clônica generalizada. O EEG, efetuado com métodos de ativação rotineira, foi normal, enquanto o EEG registrado durante leitura mostrou descargas de espículas geralmente de baixa voltagem, bilaterais e síncronas, predominando nas regiões frontocentrais, concomitantes à manifestação clínica de mioclonias da mandíbula. O uso de clonazepam, na dose de 2mg diários, levou ao controle completo das crises e normalização do EEG num período de seguimento de 24 meses.

Primary reading epilepsy is a rare form of reflex epilepsy, in which reading is the specific stimulus evoking attacks. The authors report a case of an 18-year-old man who since the age of 17 presented myoclonic jaw jerking provoked exclusively by reading. In one episode, in which reading was not interrupted, jerks were followed by a generalized convulsive seizure. EEG with routine activating procedures was normal, while EEG recorded during reading showed bilaterally synchronous paroxysmal small-voltage spikes, more prominent in frontocentral regions, coinciding with jaw myoclonus. Complete clinical seizures control and EEG normalization were achieved with clonazepam 2mg daily in a 24-month follow-up.