Warning: file_get_contents(https://ojs.journalbusiness.my/ojs.php): failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found in /var/www/ojs.unud.ac.id_backup/lib/pkp/includes/functions.inc.php on line 4 Komaladewi, A., Aryanti, P., Ary Subagia, I., Surata, I., & Wenten, I. 2019 Oct 8. Surface Modification of Microfiltration Polypropylene Membrane for Molecular Air Filtration. International Journal of Engineering and Emerging Technology. [Online] 4:1