PMC:7796291 / 10556-11150 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7796291","sourcedb":"PMC","sourceid":"7796291","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7796291","text":"FE-SEM images of filter samples were observed by Supra 55 VP (Zeiss, Oberkochen, Germany), with prior coating with Pt at 20 mA for 120 s, using a 108auto sputter coater (Cressington Scientific Inc., Watford, UK). The thickness of respirator layers was measured using a thickness gauge under the pressure of 2.4 N. Porosity and solidity of webs were calculated based on Equations (1) and (2), where m is mass of the material, A is area of the material, t is thickness, and ρ is the material density (0.95 g/cm3 for PP was used):Porosity (%) = (1 − solidity) × 100 (%)(1) Solidity = m/(A⋅t⋅ρ)(2)","divisions":[{"label":"label","span":{"begin":566,"end":569}}],"tracks":[{"project":"LitCovid-sentences","denotations":[{"id":"T94","span":{"begin":0,"end":212},"obj":"Sentence"},{"id":"T95","span":{"begin":213,"end":313},"obj":"Sentence"},{"id":"T96","span":{"begin":314,"end":594},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"attributes":[{"subj":"T94","pred":"source","obj":"LitCovid-sentences"},{"subj":"T95","pred":"source","obj":"LitCovid-sentences"},{"subj":"T96","pred":"source","obj":"LitCovid-sentences"}]}],"config":{"attribute types":[{"pred":"source","value type":"selection","values":[{"id":"LitCovid-sentences","color":"#ecd393","default":true}]}]}}