Title مكان ياب آكوستيك لوله هاي پلي اتيلن گاز شهري با استفاده از فركانسهاي استخراج شده از چيرپ Type Innovation Keywords Not Record Abstract Not Record Researchers Hsan Honarmand (First researcher) , Moslem Rahmani (Second researcher) , Ahmad Keshavarz (Third researcher) , Mohsen Heydari kaydan (Fourth researcher) , Seyed Ehsan Habibi (Fifth researcher) , Amir Seyedi (Not in first six researchers)