Volume: 38, Issue: 4 (44 Articles)
Research Article
Title: ANTI-OXIDATIVE EFFECTS OF GYPSOPHILA PERFOLIATA ON D-GALACTOSE INDUCED AGING IN RAT
Authors: Korkut Furkan ŞAHİN, Emel SERDAROĞLU KAŞIKÇI, Burcu ÇEVRELİ, Gökhan ZENGİN, Tayfun GÖZLER, Muhsin KONUK
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1657-1664
DOI: x
Viewed: (285) times
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Research Article
Title: SPATIAL ANALYSIS OF THE ROAD TRAFFIC ACCIDENT STATISTICS IN THE PROVINCES OF TURKEY
Authors: Vural YILDIRIM, Yeliz MERT KANTAR
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1667-1680
DOI: x
Viewed: (301) times
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Research Article
Title: RECYCLING PROJECT WITH RFM ANALYSIS IN INDUSTRIAL MATERIAL SECTOR
Authors: Semra ERPOLAT TAŞABAT, Esra AKCA
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1681-1692
DOI: x
Viewed: (319) times
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Research Article
Title: PREDICTION OF BIST PRICE INDICES: A COMPARATIVE STUDY BETWEEN TRADITIONAL AND DEEP LEARNING METHODS
Authors: Öyküm Esra YİĞİT, Selçuk ALP, Ersoy ÖZ
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1693-1704
DOI: x
Viewed: (348) times
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Research Article
Title: ESTIMATION OF PARAMETER FOR INVERSE RAYLEIGH DISTRIBUTION UNDER TYPE-I HYBRID CENSORED SAMPLES
Authors: Yunus AKDOĞAN, Egemen ÖZKAN, Kadir KARAKAYA, Caner TANIŞ
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1705-1711
DOI: x
Viewed: (297) times
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Research Article
Title: ARTIFICIAL NEURAL NETWORK SIMULATION OF ADVANCED BIOLOGICAL WASTEWATER TREATMENT PLANT PERFORMANCE
Authors: Selami DEMİR
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1713-1728
DOI: x
Viewed: (351) times
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Research Article
Title: CARBON DIOXIDE EMISSION IN THRACE REGION AND NEIGHBORING COUNTRIES AS A RESULT OF AEROBIC STABILIZATION OF URBAN TREATMENT SLUDGES
Authors: Ali Rıza DİNÇER, İbrahim Feda ARAL
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1729-1739
DOI: x
Viewed: (290) times
Abstract | Full Text| PDF
Research Article
Title: MODEL-BASED ANALYSIS OF THE EFFECTS OF RECYCLE RATIOS ON THE PERFORMANCE OF AN A²O PROCESS
Authors: Neslihan MANAV DEMİR, Selami DEMİR
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1741-1751
DOI: x
Viewed: (457) times
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Research Article
Title: OPTIMIZATION OF CATTLE MANURE LIQUID FRACTION ANAEROBIC DIGESTION AT DIFFERENT TEMPERATURES: MODELLING BY TAGUCHI METHOD
Authors: Elanur ADAR
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1753-1766
DOI: x
Viewed: (313) times
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Research Article
Title: BOX-BEHNKEN DESIGN OPTIMIZATION OF ELECTRO-FENTON/-PERSULFATE PROCESSES FOLLOWING THE ACIDIFICATION FOR TSS REMOVAL FROM BIODIESEL WASTEWATER
Authors: Senem YAZICI GUVENC, Gamze VARANK
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1767-1780
DOI: x
Viewed: (360) times
Abstract | Full Text| PDF
Research Article
Title: MATHEMATICAL MODELLING AND DETERMINATION OF THE NICKEL INHIBITION CONSTANT FOR NITRIFICATION
Authors: Ali Rıza DİNCER
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1781-1790
DOI: x
Viewed: (267) times
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Research Article
Title: ENERGY CONSUMPTION AND EFFICIENCY IMPROVEMENT OF ELECTRO-ACTIVATED PERSULFATE PROCESSES: OPTIMIZATION BY CCD FOR TOC REMOVAL FROM LEACHATE CONCENTRATE
Authors: Senem YAZICI GUVENC, Gamze VARANK, Ahmet DEMİR, Emine CAN GUVEN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1791-1810
DOI: x
Viewed: (262) times
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Research Article
Title: EXPERIMENTAL AND NUMERICAL INVESTIGATION OF THE EFFECTS OF VORTEX FINDER GEOMETRY ON CYCLONE PERFORMANCE
Authors: Aykut KARADENİZ, Coşkun AYVAZ, Selami DEMİR, Murat AKSEL. Arslan SARAL
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1811-1823
DOI: x
Viewed: (310) times
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Research Article
Title: ASSESSING ENVIRONMENTAL HOTSPOTS OF TIRE CURING PRESS: A LIFE CYCLE PERSPECTIVE
Authors: Simge ÇANKAYA, Beyhan PEKEY
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1825-1836
DOI: x
Viewed: (294) times
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Research Article
Title: THE ATMOSPHERIC TRANSPORTED DESERT DUST OVER SANLIURFA (TURKEY) AND ITS STRUCTURAL PROPERTIES
Authors: Tuba RASTGELDİ DOGAN, Serife Pinar YALCIN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1837-1848
DOI: x
Viewed: (251) times
Abstract | Full Text| PDF
Research Article
Title: OPTIMIZATION OF FLEXIBLE POLYURETHANE FOAM HARDNESS BY REDUCING PROCESS VARIANCE
Authors: Mithat ZEYDAN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1851-1867
DOI: x
Viewed: (430) times
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Research Article
Title: STATISTICAL ANALYSIS OF TRAFFIC ACCIDENTS IN THE KÜÇÜKÇEKMECE DISTRICT OF ISTANBUL
Authors: Emir Berk KORKMAZ, Mustafa GÜRSOY
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1869-1878
DOI: x
Viewed: (349) times
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Research Article
Title: EVALUATION OF THE DEPENDENCY OF THE COMPRESSIVE STRENGTH OF CONCRETE ON THE CORE DRILLING DIRECTION THROUGH ANOVA TEST
Authors: Şakir ERDOĞDU, Safa NAYIR, Ufuk KANDIL, Şirin KURBETCI, Memduh NAS
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1879-1895
DOI: x
Viewed: (412) times
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Research Article
Title: EVALUATION OF LOCATION SELECTION PROCESS OF LOGISTICS VILLAGES USING ANALYTIC HIERARCHY PROCESS AND ELECTRE METHODS: A CASE STUDY FOR TURKEY
Authors: Berna AKSOY, Mustafa GURSOY
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1897-1910
DOI: x
Viewed: (298) times
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Research Article
Title: THE EFFECTS OF OPERATION MODE OF SIGNAL CONTROL ON SIGNALIZED INTERSECTIONS: CASE STUDY FOR ISTANBUL HACIOSMAN ARTERIAL
Authors: Sencer OKTAV, Halit OZEN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1911-1923
DOI: x
Viewed: (284) times
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Research Article
Title: DETERMINATION OF HIGHWAY BOTTLENECKS BY USING INTELLIGENT TRANSPORTATION SYSTEMS AND GEOGRAPHIC INFORMATION SYSTEMS
Authors: Abdullah MALTAŞ, Halit OZEN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1925-1937
DOI: x
Viewed: (334) times
Abstract | Full Text| PDF
Research Article
Title: INVESTIGATING LINEAR MODELS OF ACCIDENT CAUSATION: A REVIEW STUDY IN THE CONSTRUCTION SAFETY CONTEXT
Authors: Sevilay DEMİRKESEN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1939-1949
DOI: x
Viewed: (687) times
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Research Article
Title: PERFORMANCE OF AN SI ENGINE WITH DIFFERENT SPARK PLUGS, VCR AND H2 ADDITION
Authors: Oğuz BAŞ, Mustafa Atakan AKAR, Hasan SERİN, Mustafa ÖZCANLI
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1951-1961
DOI: x
Viewed: (290) times
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Research Article
Title: UTILIZATION OF ORGANIC RANKINE CYCLE FOR ANALYZING ENERGY AND EXERGY OF THE WASTE HEAT RECOVERY SYSTEM
Authors: Farzad HOSSAIN, Md. Ashrafuzzaman MIAH
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1963-1976
DOI: x
Viewed: (268) times
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Review Article
Title: INVESTIGATION OF SINTERING CONDITIONS AND THE GNP ADDITIONS ON ALUMINUM COMPACTS
Authors: Erim AKKAYA, Uğur ÇAVDAR
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1977-1986
DOI: x
Viewed: (308) times
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Review Article
Title: PREPARATION OF COAL WATER SLURRY USING AGITATION PARAMETERS INVOLVED AND THEIR INFLUENCE-A REVIEW
Authors: Janaswamy Purushottam KARTHIK, C. Tara SASANKA, C. M. RAGHURAMAN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1987-1998
DOI: x
Viewed: (376) times
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Research Article
Title: AN EXPERIMENTAL APPROACH FOR FRICTION STIR WELDING: A CASE STUDY FOR AA 2024 – T351
Authors: Şefika KASMAN, Sertan OZAN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:1999-2011
DOI: x
Viewed: (402) times
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Research Article
Title: DETERMINATION OF THERMAL STRESS AND ELONGATION ON DIFFERENT CERAMIC COATED Ti-6Al-4V ALLOY AT ELEVATED TEMPERATURES BY FINITE ELEMENT METHOD
Authors: Berkay ERGENE, Çağın BOLAT
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2013-2026
DOI: x
Viewed: (314) times
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Review Article
Title: CHEMICAL POST-PROCESSING METHODS FOR ENHANCING SURFACE PROPERTIES OF PARTS FABRICATED BY ADDITIVE MANUFACTURING: A REVIEW
Authors: Nedim SUNAY, Mert KAYA, Yusuf KAYNAK
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2027-2042
DOI: x
Viewed: (697) times
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Research Article
Title: TURNING PROCESS PARAMETERS OPTIMIZATION OF AL7075 HYBRID MMC’S COMPOSITE USING TOPSIS METHOD
Authors: Vajrala Venkata REDDY
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2043-2055
DOI: x
Viewed: (299) times
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Research Article
Title: ANALYSIS OF LOCAL THERMAL EQUILIBRIUM ASSUMPTION IN TRANSIENT FORCED CONVECTION IN A GRAPHITE FOAM CHANNEL
Authors: Gürşah GÜRÜF, İsmail SOLMAZ, Özgür BAYER
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2057-2067
DOI: x
Viewed: (293) times
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Review Article
Title: COMPARISON OF TWO TYPES OF BINDERS NATURALS ON THE MECHANICAL AND THERMAL PROPERTIES OF TYPHA LEAF POWDER PANELS
Authors: Younouss DIÉYE, Prince. Momar GUEYE, Pape Moussa TOURE, Seckou BODIAN, Vincent SAMBOU, Soumaila TIGAMPO
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2069-2081
DOI: x
Viewed: (320) times
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Research Article
Title: FIXED POINTS OF SOFT SET-VALUED MAPS WITH APPLICATIONS TO DIFFERENTIAL INCLUSIONS
Authors: Mohammed Shehu SHAGARI, Akbar AZAM
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2083-2107
DOI: x
Viewed: (311) times
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Research Article
Title: ON THE ASYMPTOTIC BEHAVIOR OF A GENERALIZED NONLINEAR EQUATION
Authors: Juan E. NÁPOLES VALDÉS, María Nubia QUEVEDO CUBILLOS, Adrian R. GÓMEZ PLATA
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2109-2121
DOI: x
Viewed: (318) times
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Research Article
Title: ENZYMATIC HYDROLYSIS AND GLYCEMIC ASSESSMENT OF THE CARBOHYDRATES IN SOME NATURAL TURKISH INDIGENOUS FOODSTUFFS IN SIMULATED SYSTEM
Authors: Büşra YUSUFOĞLU, Mustafa YAMAN, Emine KARAKUŞ
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2123-2131
DOI: x
Viewed: (426) times
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Research Article
Title: DETERMINATION OF MINERAL AND TRACE ELEMENT IN SOME MEDICINAL PLANTS BY SPECTROSCOPIC METHOD
Authors: Harun CIFTCI, Cigdem ER CALISKAN, Ayse ERDOGAN CAKAR, Ali OLCUCU, Mohammed Sadeeq RAMADAN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2133-2144
DOI: x
Viewed: (324) times
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Research Article
Title: BROMATE REMOVAL PREDICTION IN DRINKING WATER BY USING THE LEAST SQUARES SUPPORT VECTOR MACHINE (LS-SVM)
Authors: Erdal KARADURMUŞ, Eda GÖZ, Nur TAŞKIN, Mehmet YÜCEER
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2145-2153
DOI: x
Viewed: (288) times
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Research Article
Title: EVALUATION OF GOLD MINE TAILINGS IN CEMENT MORTAR: INVESTIGATION OF THE EFFECTS OF CHEMICAL ADMIXTURES
Authors: Meral YILDIRIM OZEN, Fatma DUR, Kubra KUNT, Emek MOROYDOR DERUN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2155-2168
DOI: x
Viewed: (303) times
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Research Article
Title: PHYTOSYNTHESIS OF IRON NANOPARTICLES USING GALIUM APARINE L. EXTRACT: THEIR CHARACTERIZATION AND ANTIOXIDANT ACTIVITY
Authors: Merve BAT ÖZMATARA
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2169-2176
DOI: x
Viewed: (421) times
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Research Article
Title: PARABOLIC FILTER MEL FREQUENCY CEPSTRAL COEFFICIENT AND FUSION OF FEATURES FOR SPEAKER AGE CLASSIFICATION
Authors: Mohammed Muntaz OSMAN, Osman BÜYÜK
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2177-2191
DOI: x
Viewed: (388) times
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Research Article
Title: DESIGN AND IMPLEMENTATION OF COMPACT FOUR WAY WILKINSON POWER DIVIDER FOR UHF APPLICATIONS
Authors: Ömer KASAR
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2193-2203
DOI: x
Viewed: (696) times
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Research Article
Title: DESIGN AND ANALYSIS OF A FLYBACK CONVERTER WITH IMPROVED SNUBBER CELLS
Authors: Umit TANRIKULU, Erdem AKBOY, Burak AKIN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2205-2216
DOI: x
Viewed: (692) times
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Research Article
Title: ESTIMATION PERFORMANCE OF SOIL MOISTURE WITH GPS-IR METHOD
Authors: Cemali ALTUNTAŞ, Nursu TUNALIOĞLU
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2217-2230
DOI: x
Viewed: (543) times
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Research Article
Title: PERFORMANCE EVALUATION OF REAL TIME PRECISE POINT POSITIONING FOR MULTI-GNSS CONCEPT
Authors: Furkan KARLITEPE, Nursu TUNALIOĞLU, Bahattin ERDOĞAN
Journal: Sigma Journal of Engineering and Natural Sciences
Issue: Name: Regular, Year: 2020, Volume: 38, Issue: 4, (DEC 2020), pp:2231-2244
DOI: x
Viewed: (933) times
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