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Yüksek basınçlı hidrojen depolama tanklarında kullanılan malzemelerin kırılma analizi
No full textFen Bilimleri Enstitüsü, Makine Mühendisliği Ana Bilim DalıBu çalışma, tip III kompozit basınç tankının kırılma tokluğunun belirlenmesine odaklanmıştır. Bu amaçla tip III kompozit basınçlı tanktan alınan numuneler üzerinde belirtilen yöntemlere uygun olarak deneysel ve sayısal çalışmalar yapılmıştır. Bu çalışmanın temel amacı klasik dayanım yaklaşımına ek olarak boru veya basınçlı tank gibi dairesel şekilli malzemelerin kırılma tokluğunun doğru bir şekilde belirlenmesidir. Bu amaçla, tankın çember çekme mukavemeti ve kırılma tokluğunu belirlemek için üniversal test makinesinde kullanılmak üzere fikstürler üretildi. Daha sonra basınç tankından alınan numuneler ile bölünmüş disk çekme aparatı (split disk tensile test – SDT) kullanılarak çekme testleri yapılmıştır. Tankın çekme mukavemeti belirlendikten sonra elastisite modülü de belirlenmiştir. Ayrıca tank gövdesi Abaqus ile sonlu elemanlar yöntemi kullanılarak düz plaka olarak modellenmiş ve deneysel sonuçlarla karşılaştırıldığında elastisite modülü %98,34 doğrulukla tahmin edilmiştir. Çekme testinin ardından tankın kırılma tokluğunu belirlemek için kavisli CT (comapckt tension) numuneleri kullanılarak deneysel çalışmalar yapıldı ve deneysel sonuçlar düz olarak modellenmiş CT sayısal modeliyle karşılaştırıldı. Deneysel ve sayısal mod I gerilme yoğunluk faktörü değerlerinin %2,7 sapma ile birbirine yakın elde edilmiştir. Son olarak PRNB (pipe ring notched bending) yöntemi ile deneysel ve sayısal çalışmalar yapılmıştır. Bu yöntemin sayısal modeli kullanılarak basınç tankının kırılma tokluğu hesaplanmıştır. Bu model aynı zamanda mod I kritik gerilme yoğunluk faktörüne odaklanarak, çatlak uzunluğunun değişiminin tankın depolama basıncı üzerindeki etkisini araştırmak için de kullanıldı. Çalışmalar sonucunda çatlak uzunluğu/genişlik oranı (a/w) 0,1 olduğunda depolama basıncının 38 MPa olduğu, a/w oranı 0,5 olduğunda depolama basıncının 7 MPa değerine düştüğü belirlendi. Bu sonuçlardan tank gövdesindeki mevcut çatlakların çatlak uzunluğuna bağlı olarak depolama basıncını ciddi şekilde etkilediği sonucuna varılmıştır.This work focused on determination of fracture toughness of a type III composite pressure tank. For this purpose, experimental and numerical studies were carried out on specimens taken from the type III composite pressure tank in accordance with the specified methods. The main purpose of this study was to accurately determine the fracture toughness of circular shaped materials such as pipes or pressure tanks in addition to the classical strength approach. For this aim, fixtures were manufactured for use in the universal test machine to determine hoop tensile strength and fracture toughness of the tank. Subsequently, split disk test (SDT) were carried out on specimens taken from the pressure tank. After determining the hoop strength of the tank using SDT method, its modulus of elasticity was also determined. In addition, the tank body was modeled as a flat plate with Abaqus using finite element method, and the modulus of elasticity was predicted with 98.34% accuracy with experimental results. Following the hoop tensile test, experimental studies were performed using curved compact tension (CCT) method to determine fracture toughness of the tank and their results compared by flat compact tension (CT) numerical model. The values of the experimental and numerical mode I stress intensity factor were measured that, experimental and numerical mode I stress intensity factor values were found. Consequently, the values found were close to each other with a deviation of 2.7%. Finally, experimental and numerical studies of the pipe ring notched bending (PRNB) method were carried out. Using the numerical model of this method, the fracture toughness of the pressure tank was computed. This model was also used to investigate the effect of varying the crack lengths on the storage pressure of the tank, focusing on the mode I critical stress intensity factor (KIC). As a result of the studies, it was determined that when the crack length to width ratio (a/w ) was 0.1, the storage pressure was 38 MPa, and when the a/w ratio was 0.5, the storage pressure decreased to 7 MPa. From these results it was concluded that the existing cracks in the tank body seriously affected the storage pressure depending on the crack length
Unraveling the origins of construction rework: a holistic bibliometric analysis and exploration of causative factors
No full textPurposeConstruction experts acknowledge the adverse effects of rework on project performance. However, the limited understanding of its underlying causes remains a significant challenge. Therefore, this study aimed to thoroughly investigate the sources of construction rework.Design/methodology/approachA mixed review using bibliometric analysis as a quantitative method and content analysis as a qualitative method was performed to understand the current knowledge in the field. The Web of Science (WoS) was selected for its comprehensive collection of major research articles and integrated analytical tools for generating representative data. The study involved an extensive bibliometric analysis of 107 journal articles on rework causes from 1991 to 2023. RStudio Bibliometrix, an R statistical programming package, was used to analyze rework origins. This method involved mapping the research landscape, identifying research gaps and analyzing emerging trends.FindingsThe causes of rework can be classified into three main clusters: human- and contractual-based rework causes, design-, quality- and project management-based rework causes and organizational-based rework causes.Originality/valueAlthough several studies have addressed rework causes from various perspectives and methods, the topic has not been investigated holistically. This study is the first to leverage the quantitative and qualitative analytical capabilities of the RStudio Bibliometrix package. Innovative approaches, including the use of metrics, such as the h-index, thematic mapping and trend topic analysis, were employed for a comprehensive understanding of rework causes
Technology position of concentrating solar technologies in Turkiye: A review on current status, applications, and prospects
No full textTurkiye has considerable solar resources and technology capacity and thus is seeking ways to implement carbon-neutral energy policies and reduce import energy. After China, Turkiye has the world's second-largest installed nonconcentrating collector area. Since the last quarter, significant efforts have been made in Turkiye to implement concentrated solar technologies (CST), including the world's largest industrial solar energy cooling system and the first solar thermal trigeneration system, the first integrated renewables combined cycle, as well as more efficient two-axis tracking parabolic trough systems. This review highlights the overall status, developments, research trends, breakthroughs, technology deployment, challenges, and prospects of the commercial Turkish CST. It aims to present the historical development of CST and associated research activities conducted and ongoing in Turkiye, infrastructure of national organizations, a pathway for the alignment of national/global research and funding programs, and commercial-level contributions for the future progress of CST. It would also bridge the gap between the research and commercial deployment of CST and speed up the relevant transfer of knowledge so that researchers, institutions, companies, decision-makers, and other stakeholders in Turkiye and the world can gain a greater perspective. Although considerable efforts have been made in the Turkish CST context, similar to 10-MWt cumulative capacity is actively operated, of similar to 60% and similar to 32% led, respectively, by the parabolic trough and central tower receiver technologies
The Effect of Riblets on the Aerodynamic Performance of NACA 0018 Airfoil
No full textIn this numerical study, riblets on the airfoil were utilized to enhance the aerodynamic performance of NACA0018 airfoil. Riblets of identical height and base length are strategically placed on the suction surface of the airfoil with varying spacing ratios along the flow direction (x) and chord length (c), specifically x/c = 0.3 and 0.7. Four distinct riblet airfoil models are subjected to computational fluid dynamics (CFD) analysis within an angle of attack range from 0° to 21° at a Reynolds number of Re=1×105. The obtained results are systematically compared with the performance of the plain airfoil. Numerical analyses reveal the significant influence of the spacing ratio on flow control and the overall aerodynamic performance of the airfoil, establishing a direct relationship with riblet spacing. The presence of riblet structures is observed to increase the lift coefficient, concurrently delaying the stall angle up to 19°. Notably, the ribbed structures effectively mitigate the interaction between the laminar separation bubble and trailing edge separation, leading to a reduction in turbulent kinetic energy values
Geriye dönük bir adımda aşağı akışın kontrolü
No full textLisansüstü Eğitim Enstitüsü, Makine Mühendisliği Ana Bilim Dalı, Makine Mühendisliği Bilim DalıAktif ve pasif akış yöntemlerini kullanarak geriye dönük adım etrafındaki akışı kontrol etmek için nümerik bir çalışma gerçekleştirilmiştir. Coanda aktüatör aktif akış kontrol metodu olarak kullanılırken, eğimli çift basamaklı geriye dönük adım da pasif akış kontrol yöntemi olarak kullanılmıştır. Araştırma, basamak yüksekliği ve serbest akış hızı baz alınarak ????? = 6000, 9600 ve 20000 Reynolds sayılarında gerçekleştirilmiştir. Geriye dönük adım üzerindeki akışın çözümü için, Spalart-Allmaras, gerçekleştirilebilir k-epsilon ve SST k-omega olmak üzere üç farklı türbülans modeli test edilmiştir. Deneysel verilerle karşılaştırıldığında, Spalart-Allmaras modeli yeniden bağlanma uzunluğu, Xr'ı, %0,95 hatayla tahmin ettiğini gösterdi. Ancak, SST k-omega modeli girdap bölgesinde eksenel hızı maksimum %5 hatayla tahmin etti. Akış kontrolü olmayan, değiştirilmemiş geriye dönük adım durumunda, yeniden bağlanma uzunluğu sırasıyla ????? = 6 × 103, 9.6 × 103 ve 20 × 103 için Xr/h = 4.40, 4.16, 4.20 şeklinde bulunmuştur. Coanda aktüatörü aracılığıyla yapılan aktif akış kontrolü sonucunda CM = 0.02 momentum katsayısı kullanılarak, Reh = 6 × 103, 9.6 × 103, 20 × 103 için, yeniden bağlanma uzunluğu sırasıyla Xr/h = 1.0, 0.58 ve 0.56'ya düşmüştür. Daha büyük momentum katsayısı, yani CM ? 0.06 kullanıldığında girdap bölgesi tamamen ortadan kalktı. Eğimliçift basamaklı geriye dönük adım yoluyla pasif akış kontrolü durumunda, üst basamak yüzeyinin eğim açısı, ? = 15 derece ve alt basamak yüzeyinin, ? = 70 derece kombinasyonları kullanılarak yeniden bağlanma uzunluğundaki maksimum bağıl yüzde azalma %20.2 olmuştur. Öte yandan, ? = 75 derece ve 90 derece dahil olmak üzere diğer eğimli yüzey kombinasyonları, değiştirilmemiş BFS geometrisi ile elde edilenden daha uzun yeniden bağlanma uzunluğuyla sonuçlanmıştırA numerical study was performed to control the characteristics of the flow through the backward-facing step with the aid of active and passive control methods. The Coanda actuator was used as the active flow control method while the inclined double backward-facing step surfaces were used as the passive flow control method. The investigations were performed for the Reynolds Numbers of Reh=6000, 9600, and 20000 based on step height, h, and the free stream velocity. Three different turbulence models, i.e., Spalart-Almaras, realizable k-epsilon and SST k-omega turbulence models, were tested for the solution of the flow over the backward-facing step. The results, which were validated using the experimental data, shown that the Spalart-Allmaras model estimated the reattachment length, with an error of 0.95%. However, in the recirculation region, the SST k-omega estimated the axial velocity with a maximum error of 5%. In the case of an unmodified backward-facing step with no flow control, the reattachment length was found as Xr/h = 4.40, 4.16, 4.20 for , and. As the results of the active flow control via the Coanda actuator, at the momentum coefficient of CM = 0.02, the reattachment length was reduced to Xr/h = 1.0, 0.58, and 0.56 for Reh = 6000, 9600, 20000, respectively. Using a larger momentum coefficient, i.e., CM ? 0.06, completely vanished the recirculation region. In the case of passive flow control via inclined double backward-facing step, the maximum relative percent reduction of the reattachment length was 20.2% using the combinations of the inclination angle of upper step surface, ? = 15 degree, and lower step surface, ? = 70 degree. On the other hand, the other inclined surface combinations, including ? = 75 degree and 90 degree, resulted longer reattachment length than the one obtained with unmodified BFS geometr
High-Gain Multi-Band Koch Fractal FSS Antenna for Sub-6 GHz Applications
No full textFeatured Application The proposed antenna is potentially suitable for Wi-MAX (3.5 GHz) and sub-6 GHz n77 (3300-3800 MHz), n78 (3300-4200 MHz), and n79 (4400-4990 MHz), in addition to C-band applications.Abstract This study introduces a novel antenna based on the binary operation of a modified circular patch in conjunction with the Koch fractal. The antenna is intended for applications in the sub-6 GHz band, partial C-band, and X-band. The low-cost antenna is fabricated on a 1.6-mm-thick FR-4 substrate. A frequency-selective surface (FSS) is used to overcome the decreased values of the gain and bandwidth due to the fractal operations. The introduced split ring resonator (SRR) and the antenna substrate dimension reduction reduce the bandwidth and antenna gain. The air gap between the FSS and the antenna not only enhances the antenna gain but also controls the frequency tuning at the design frequency. The antenna size is miniaturized to 36.67%. A monopole antenna ground loaded with an SRR results in improved closest tuning (3.44 GHz) near the design frequency. The antenna achieves a peak gain of 9.37 dBi in this band. The FSS-based antenna results in a 4.65 dBi improvement in the gain value with the FSS. The measured and simulated plots exhibit an excellent match with each other in all three frequency bands at 2.96-4.72 GHz. These bands cover Wi-MAX (3.5 GHz), sub-6 GHz n77 (3300-3800 MHz), n78 (3300-4200 MHz), and approximately n79 (4400-4990 MHz), in addition to C-band applications
A Comprehensive Analysis of Apricot Drying Methods via Multi-Criteria Decision Making Techniques
No full textFood and food safety have been among the most important issues for people throughout history. Societies have always tried to be self-sufficient in food and have avoided becoming dependent on foreign sources. However, the fact that most foods are seasonal and the increasing population's food consumption have revealed the need to preserve foodstuffs for a long time. The old and well-known method used today for extending shelf life is the drying process. The drying process is preferred over other preservation methods for reasons such as being more economical, easier to transport, having a longer shelf life, more concentrated nutritional value, and containing fewer additives. This ensures that dried foods are of higher quality in terms of physical, chemical, microbial properties, and nutritional values compared to other packaged foods. While the drying process was traditionally done over a long period, technological advancements have led to the production of higher quality and more valuable commercial products in a shorter time. In this study, traditional and technological methods used in drying apricots were compared according to the parameters determined by experts in the field. Since multiple parameters are effective in the comparison, Multi-Criteria Decision Making (MCDM) techniques were used. The optimum apricot drying method was determined by combining the results obtained from different MCDM techniques with the Borda rule.Gendarmerie and Coast Guard AcademyAll authors are thankful to Adana Alparslan Turkes Science and Technology University, and Gendarmerie and Coast Guard Academy, for their support in the preparation of this manuscript
Effect of doping on transport properties of InSb epilayers grown by MOCVD and MBE
No full textTemperature-dependent carrier transport properties of two InSb epilayers grown on GaAs substrates by Molecular Beam Epitaxy (MBE) and Metal Organic Chemical Vapor Deposition (MOCVD) are investigated. The InSb epilayer grown by MBE was undoped, but the undoped InSb epilayer grown by MOCVD was grown on a thin Zndoped InSb layer. Hall Effect results showed that the Hall coefficients (RH) for InSb grown by MBE and MOCVD are negative in temperature ranges 4.2 K-300 K and 200 K-300 K, respectively. However, for the InSb sample grown by MOCVD, RH switches from a positive to a negative value for temperatures above similar to 180 K, which could be due to the capture electrons generated from dislocation between InSb and GaAs by Zn atoms. The electron mobilities of InSb grown by MBE and MOCVD were 38,247 and 51,704 cm(2)/Vs, respectively. Low-temperature magnetoresistance measurements showed clear Shubnikov-de-Haas oscillations (SdH) in MBE InSb; however, no SdH oscillations were observed in MOCVD InSb samples.Scientific Research Projects Coor- dination Unit of Istanbul University [FBG-2022-38573]This study was supported by the Scientific Research Projects Coor- dination Unit of Istanbul University (Project No: FBG-2022-38573)
Pectin/sodium alginate films tailored with Acetyl-11-keto-beta-boswellic acid for active packaging
No full textThe present study aimed to develop food packaging films by using a combination of pectin (PE) and sodium alginate (SA) enriched with Acetyl-11-keto-beta-boswellic acid (AKBA) as a functional or active ingredient. The fabricated films underwent comprehensive evaluation of their morphological, chemical, mechanical, barrier, optical, thermal, antioxidant, and antimicrobial properties. SEM and FTIR analysis showed that AKBA had good compatibility with film-forming components. The AKBA-loaded film samples exhibited a decrease in their barrier properties and tensile strength, but enhancements in both elongation at break and thickness values was observed. With the addition of AKBA, a significant increase (p < 0.05) in the ultraviolet barrier properties of the films and total colour variation (Delta E) was observed. TGA analysis of the films unveiled an improvement in thermal resistance with the incorporation of AKBA. Moreover, the films loaded with AKBA exhibited potent antioxidant activity in the ABTS and DPPH assay methods. Disk diffusion analysis showed the antimicrobial activity of AKBAloaded films against P. aeruginosa, highlighting the potential of AKBA as a natural antimicrobial agent for the safety of food products. The results demonstrate the practical application of PE and SA active films loaded with AKBA, particularly within the food packaging industry.TRC [BFP/RGP/HSS/22/ 007]The study was supported by TRC grant number BFP/RGP/HSS/22/ 007
Türkiye'de tarımsal desteklerin tarımsal üretime etkisi: Panelveri analizi ve nominal grup tekniği uygulanması
No full textSosyal Bilimler Enstitüsü, İşletme (İngilizce) Ana Bilim Dalı, Sayısal Yöntemler Bilim DalıTürkiye'de 2002-2022 döneminde tarım alanlarının daralmasına rağmen tarımsal üretim %100'en fazla artış göstermiştir. Ayrıca bu dönemde Türkiye'nin tarımsal üretime yön vermek amacıyla kullandığı destekleme araçları ile ilgili uluslararası anlamda yeni ilke ve yaklaşımlar da belirlenmiştir. Türkiye'nin üye olduğu Dünya Ticaret Örgütü (WTO)'nun Doha Tarım Müzakereleri'nde ve üyelik sürecini yürüttüğü Avrupa Birliği'nde neoliberal politikalar doğrultusunda tarımsal iç desteklemelerin tarımsal üretimden bağımsız olması gerektiği, uluslararası ticareti bozan iç desteklerin azaltılması ilkeleri benimsenmiştir. Bu ilkeler doğrultusunda hem WTO üyeleri hem de EU ülkelerinde tarımsal iç desteklemeler tarımsal üretim yerine ürün ve üretici odaklı bir forma dönüşmüştür. Bu doğrultuda Türkiye'de uygulanmakta olan tarımsal desteklemelerin tarımsal üretimden bağımsız olup olmadığı uluslararası yükümlülükler bakımından önem arz etmektedir. Tarımsal desteklemelerin asli ilkelerinden birisi olan yerli üreticileri koruma amacının ise ne derece gerçekleştiği ayrı bir sorudur. Belirtilen hususlar ışığında bu çalışmada; Türkiye'de milenyum sonrası kullanılan tarımsal destekleme araçlarının tarımsal üretimden bağımsız olup olmadığı, tarımsal desteklerin tarımsal üreticileri ne derecede koruduğu, tarımsal destekleme uygulamalarına yönelik problemlerin neler olduğu ele alınmıştır. Çalışma kapsamında biri nitel diğeri ampirik olmak üzere iki farklı analiz gerçekleştirilmiştir. Nominal Grup Tekniği (NGT) kullanılarak Çukurova'da, destekleme politikalarının etkinliğini tespit edilmiş, tarımsal üreticilerin üretim süreçlerinde yaşadıkları problemlerin öncelik ve önem sırasını belirlenmiştir. NGT sonuçları makro bir perspektif sunması amacıyla tematik analize tabii tutulmuştur. Tarımsal desteklemelere yönelik üzerinde mutabakat sağlanan en önemli eleştiriler sırasıyla akaryakıt ve gübre desteğinin yetersizliği, desteklerin planlı üretime yönlendirmemesi ve bu desteklerin vergi yükünü azaltmaya yönelik olmayışıdır. Tarımsal üretim sürecinde yaşanan zorluklar ise tematik olarak tarımsal girdilerin yüksekliği (%32,6), operasyonel maliyetler (%31,4), tarımsal desteklemelerin yetersizliği (%19) ve sektörel problemler (%16,9) olmuştur. Türkiye'de tarımsal desteklerin üretimden bağımsız olup olmadığı ve tarımsal desteklemelerin uygulama türlerine göre üretim üzerinde etkisini tespit etmek amacıyla 2002-2020 dönemini ve 81 ili kapsayan 4 farklı ekonometrik tahmin modeli kurulmuştur. Ekonometrik modeller Huber, Eicker ve White tarafından geliştirilen tahminci kullanılarak tahmin edilmiştir. Analizler sonucu elde edilen bulgular, tarımsal desteklerin tarımsal üretimden bağımsız olmadığını ortaya koymuştur, ceteris paribus. Spesifik olarak, fark ödeme desteklemelerinde gerçekleşen %1 birimlik artış, tarımsal üretim üzerinde ortalama %0,85, alan bazlı desteklemelerde %1 birimlik artış, tarımsal üretim üzerinde ortalama %0,78, hayvancılık desteklemelerindeki %1 birimlik artış ise tarımsal üretim üzerinde ortalama %2,63 oranında istatistiksel olarak anlamlı bir etki yarattığı görülmektedir. Toplam tarımsal desteklemelerdeki %1 birimlik artış ise tarımsal üretim üzerinde %2,49 oranında istatistiksel olarak anlamlı bir etki yaratmaktadır. Çalışmada yer alan, ampirik analizlerde yararlanılan kimyevi gübre tüketimi ve tarımsal kredi kullanımı değişkenlerinin de düşük bir katsayı ile dahi olsa tarımsal üretim üzerinde istatistiksel olarak anlamlı ve negatif bir etkisi ortaya konmuştur. Yapılan analizlere ait bulgular ışığında, Türkiye'nin tarımsal desteklemeler hususunda ulusal amaç ve kaygıları ile uluslararası taahhüt ve sorumlulukları çerçevesinde tarımsal desteklemelerin düzeyini ele alması önem arz etmektedir. Tüm dünyada gıda enflasyonunun arttığı, tarım ürünlerine erişim sorunları dolayısıyla korumacı tarımsal iç destekleme politikalarına yönelimin başladığı bir dönemde Türkiye'de de iç destekleme politikalarının etkinlik düzeyinin arttırılması önerilmektedir. Anahtar Kelimeler: Tarımsal destekler, panel veri analizi, nominal grup tekniği, tarımsal liberalizasyon, tarımsal üretimDespite the shrinkage of agricultural land in Türkiye between 2002 and 2022, agricultural production has increased by more than 100%. In addition, new international principles and approaches were established during this period for the support instruments used by Türkiye to manage agricultural production. In the Doha agricultural negotiations of the World Trade Organization (WTO), of which Türkiye is a member, and in the European Union, where it is carrying out the accession process, the principles that internal agricultural supports should be independent of agricultural production and that internal supports that interfere with international trade should be dismantled were adopted in line with neoliberal policies. In line with these principles, domestic agricultural support in both WTO members and EU countries has evolved into a form that focuses on products and producers rather than agricultural production. In this context, the question of whether the agricultural support provided in Türkiye is independent of agricultural production is important in terms of international commitments. Another question is to what extent the objective of protecting domestic producers, which is one of the basic principles of agricultural subsidies, is achieved. Against the background of these questions, this study discusses whether the instruments of agricultural support used in Türkiye after the turn of the millennium are independent of agricultural production, to what extent agricultural support protects agricultural producers and what problems exist with the practice of agricultural support. Two different analyzes were carried out as part of the study, one qualitative and one empirical. The Nominal Group Technique (NGT) was used to determine the effectiveness of the support measures in Çukurova Region and to determine the priority and importance of the problems experienced by agricultural producers in their production processes. The NGT results were subjected to a thematic analysis in order to obtain a macro perspective. The main criticisms agreed upon in relation to agricultural support are the inadequacy of fuel and fertilizer support, the fact that support is not targeted at planned production, and the fact that this support is not aimed at reducing the tax burden. The difficulties encountered in agricultural production were thematically high agricultural inputs (32.6%), operating costs (31.4%), insufficient agricultural support (19%) and sectoral problems (16.9%). In order to determine whether agricultural support is independent of production in Türkiye and how agricultural support affects production depending on the type of application, 4 different econometric forecasting models were created for the period 2002-2020 and 81 provinces. The econometric models were estimated using the estimator developed by Huber, Eicker and White. The results of the analysis show that, ceteris paribus, agricultural supports are not independent of agricultural production. Specifically, a 1 % unit increase in deficiency payments has an average effect of 0.85 % on agricultural production, a 1 % unit increase in area-based supports has an average effect of 0.78 % on agricultural production and a 1 % unit increase in animal supports has an average effect of 0.85 % on agricultural production. The statistically significant effect is 2.63. A 1% unit increase in total agricultural support has a statistically significant effect of 2.49% on agricultural production. The variables included in the study and used in the empirical analysis for the consumption of chemical fertilizers and the use of agricultural credit also have a statistically significant and negative effect on agricultural production, albeit with a low coefficient. Given the results of the analyzes, it is important for Türkiye to address the level of agricultural subsidies within the framework of its national goals and concerns regarding agricultural subsidies and its international commitments and responsibilities. At a time when food inflation is increasing worldwide and there is a trend towards protectionist domestic support policies for agriculture due to problems in accessing agricultural products, it is recommended that the effectiveness of domestic support policies in Türkiye be significantly improved. At a time when food inflation is increasing worldwide and there is a trend towards protectionist domestic support policies for agriculture due to problems with access to agricultural products, it is recommended that the effectiveness of domestic support policies in Türkiye be increased. Keywords: Agricultural supports, panel data analysis, nominal group technique, agricultural liberalization, agricultural productio