Sigma Journal of Engineering and Natural Sciences

Research Article
Title: IDENTIFICATION OF THE PRIORITY REGIONS IN THE CUSTOMER WATER METERS REPLACEMENT USING THE AHP AND ELECTRE METHODS
Authors: Salih YILMAZ, Mahmut FIRAT, Cansu BOZKURT, Özgür ÖZDEMİR
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: December, Year: 2021, Volume: 39, Issue: 4, (DEC 2021), pp:331-342
DOI: 10.14744/sigma.2021.00022
Viewed: (486) times
Abstract | Full Text| PDF

Research Article
Title: TIME-VARYING PARAMETER ESTIMATION AND ADAPTIVE KALMAN FILTER IN COMPUTER AIDED CONTROL APPLICATION
Authors: Levent ÖZBEK
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: December, Year: 2021, Volume: 39, Issue: 4, (DEC 2021), pp:343-350
DOI: 10.14744/sigma.2021.00023
Viewed: (551) times
Abstract | Full Text| PDF

Research Article
Title: DETERMINATION OF CHANGES IN SOME BIOLOGICAL PROPERTIES DURING STORAGE OF SOME CONVENTIONAL SORBETS
Authors: Affet Demet KAFADAR, Lutfiye EKİCİ, Sevil ALBAYRAK
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: December, Year: 2021, Volume: 39, Issue: 4, (DEC 2021), pp:351-366
DOI: 10.14744/sigma.2021.00024
Viewed: (433) times
Abstract | Full Text| PDF

Research Article
Title: MONITORING OF HEAVY METAL POLLUTION BY USING POPULUS NIGRA AND CEDRUS LIBANI
Authors: Harun CIFTCI, Cigdem ER CALISKAN, Erdal ASLANHAN, Ekrem AKTOKLU
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: December, Year: 2021, Volume: 39, Issue: 4, (DEC 2021), pp:367-373
DOI: 10.14744/sigma.2021.00025
Viewed: (513) times
Abstract | Full Text| PDF

Research Article
Title: ESTIMATION OF GROUND TYPES IN DIFFERENT DISTRICTS OF GÜMÜŞHANE PROVINCE BASED ON THE AMBIENT VIBRATIONS H/V MEASUREMENTS
Authors: Serkan ÖZTÜRK, Yasemin BEKER, Mahmut SARI, Levent PEHLİVAN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: December, Year: 2021, Volume: 39, Issue: 4, (DEC 2021), pp:374-391
DOI: 10.14744/sigma.2021.00026
Viewed: (476) times
Abstract | Full Text| PDF

Research Article
Title: CHARACTERIZATION OF IN VITRO BIOACTIVE PERFORMANCE OF Hypericum perforatum USING RESPONSE SURFACE METHODOLOGY
Authors: Mahmut KAPLAN, Serap KÖPRÜ, Rabia SAY, Kevser KARAMAN, M. Mücahit YILMAZ
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: December, Year: 2021, Volume: 39, Issue: 4, (DEC 2021), pp:392-403
DOI: 10.14744/sigma.2021.00027
Viewed: (647) times
Abstract | Full Text| PDF

Research Article
Title: VIBRATION SUPPRESSION OF A MICRO BEAM SUBJECTED TO MAGNETO-ELECTRIC LOAD
Authors: Kenan YILDIRIM
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: December, Year: 2021, Volume: 39, Issue: 4, (DEC 2021), pp:404-413
DOI: 10.14744/sigma.2021.00028
Viewed: (600) times
Abstract | Full Text| PDF

Research Article
Title: THERMODYNAMIC STUDIES ON TERT-AMINE MODIFIED POLYSTYRENE BASED POLYMER/SOLVENT SYSTEMS BY INVERSE GAS CHROMATOGRAPHY METHOD
Authors: A. Çiğdem ADIGÜZEL, Burak KORKMAZ, Fatih ÇAKAR, Özlem CANKURTARAN, B. Filiz ŞENKAL
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: December, Year: 2021, Volume: 39, Issue: 4, (DEC 2021), pp:414-421
DOI: 10.14744/sigma.2021.00029
Viewed: (664) times
Abstract | Full Text| PDF

Research Article
Title: ECOLOGICAL RISK ASSESSMENT OF DOMESTIC SEWAGE SLUDGE: A CASE STUDY
Authors: Elif YAKAMERCAN, Ahmet AYGÜN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: December, Year: 2021, Volume: 39, Issue: 4, (DEC 2021), pp:422-433
DOI: 10.14744/sigma.2021.00030
Viewed: (873) times
Abstract | Full Text| PDF

Research Article
Title: HOW ECONOMIC FREEDOM AFFECT THE EASE OF DOING BUSINESS? CROSS-COUNTRY QUANTILE REGRESSION MIXTURE APPROACH
Authors: Serpil KILIÇ DEPREN, Özer DEPREN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: December, Year: 2021, Volume: 39, Issue: 4, (DEC 2021), pp:434-442
DOI: 10.14744/sigma.2021.00031
Viewed: (937) times
Abstract | Full Text| PDF