PMC:7796291 / 15355-15612 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T135","span":{"begin":0,"end":257},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Previous studies reported the deteriorated performance with thermal treatment of electret filters [10,41], but most of the performance deterioration occurred with harsher conditions (120 °C, 48 h) and especially for materials with high dielectric constants."}