21241 research outputs found
Sort by
Advantages of Distal Unlocked Proximal Femoral Nails in the Treatment of Stable Intertrochanteric Fractures in Geriatric Patients: A Single-Center Comparative Randomized Study
Get PDFBackground: This study aimed to investigate the effect of omitting a distal locking screw in intramedullary nailing of stable intertrochanteric femur fractures on clinical outcomes. Methods: Ninety-six patients over 65 years old with stable pertrochanteric fractures (AO/OTA 31-A1 and A2) treated with short/intermediate proximal femoral nails (PFNA-II) were randomly assigned into two groups: Group 1 (distal locked) and Group 2 (distal unlocked). Comparative analyses were conducted on operative time, total fluoroscopy time, blood loss, incision length, complications, and functional outcomes. Results: The mean operative time was significantly shorter in Group 2 (35.73 +/- 7.62 minutes) compared to Group 1 (47.40 +/- 9.96 minutes) (P < 0.001). Fluoroscopy time was also shorter in Group 2 (45.92 +/- 6.08 seconds) compared to Group 1 (54.02 +/- 5.94 seconds) (P < 0.001). Incision length was reduced in Group 2 (9.21 +/- 1.41 centimeters) compared to Group 1 (12.96 +/- 1.68 centimeters) (P < 0.001). Blood loss was lower in Group 2 (187.50 +/- 32.00 milliliters) than in Group 1 (208.65 +/- 49.12 milliliters) (P < 0.05). There were no significant differences between the groups in fracture union time, hospital stay, fracture union weeks, or postoperative blood transfusion rates. Conclusions: Proximal femoral nailing without distal locking offers shorter operative times, reduced fluoroscopy exposure, and lower blood loss and complications, making it a viable option for treating stable intertrochanteric fractures
EXISTENCE RESULTS FOR A HYBRID SYSTEM OF MIXED DIFFERENTIAL EQUATIONS WITH SEQUENTIAL FRACTIONAL DERIVATIVES
Get PDFIn this paper, we focus on the study of a hybrid system of sequential type that incorporates both Caputo and Hadamard fractional derivatives. Our approach leverages the fixed point principle to derive novel results concerning the existence and uniqueness of solutions to this system. Additionally, we establish further results by employing Schaefer's fixed point theorem, which allows us to extend the applicability of our findings. To illustrate the practical relevance and application of our theoretical results, we also provide a detailed example at the conclusion of the paper. At the end, an example is given
Prefabrikasyon - BIM Entegrasyonunun Bibliyometrik Analizi ve Haritalandırılması
Get PDFPrefabrikasyon ve Yapı Bilgi Modellemesi (BIM) entegrasyonu, inşaat sektöründe giderek artan bir şekilde uygulanmakta ve sektörün dijitalleşmesine önemli katkılar sağlamaktadır. Bu çalışmada, prefabrikasyon ve BIM entegrasyonuna yönelik literatürdeki durum bibliyometrik analiz yöntemiyle incelenmiştir. Web of Science veri tabanından elde edilen 426 yayın, VOSviewer yazılımı aracılığıyla analiz edilmiş ve haritalandırılmıştır. Prefabrikasyonun hız, maliyet tasarrufu, kalite kontrolü ve sürdürülebilirlik gibi avantajları ele alınırken BIM’in dijitalleşme ve disiplinler arası koordinasyon sağlama potansiyeli vurgulanmıştır. Analiz sonuçları; Çin, Avustralya ve İngiltere’nin bu alandaki bilimsel liderliğini ve Hong Kong Politeknik Üniversitesinin katkılarını ortaya koymuştur. Ayrıca, Automation in Construction dergisi en etkili yayın platformu olarak belirlenmiştir. En fazla iş birliği içinde olan yazar olarak ‘Li, Clyde Zhengdao’ öne çıkarken; en çok atıf alan yayın Hosseini vd., (2018), en yüksek bağlantı gücüne sahip yayın ise Yin vd., (2019) tarafından gerçekleştirilen makale olarak belirlenmiştir. Bu çalışma, BIM destekli prefabrikasyonun sektördeki yenilikçi uygulamaların yaygınlaşmasını destekleme ve gelecekteki araştırmalara yön verebilme potansiyeline sahip olduğunu göstermektedir
Emerging market SMEs' internationalization enablers and their influence on internationalization patterns: The case of Turkish automotive suppliers
Get PDFSmall and medium-sized enterprises (SMEs) in emerging markets (EMs) are increasingly engaging in internationalization despite facing resource constraints and institutional barriers. However, there is limited understanding of how internationalization enablers influence internationalization patterns in these contexts. We investigate how networks, strategic entrepreneurship, and government support shape the speed, scope, and scale of internationalization among EM SMEs. Analyzing Turkish SMEs in the automotive supplier industry, we adopt a multiple case study approach to examine how they mobilize internal and external enablers under conditions of institutional duality and market volatility. Our findings reveal that institutional and business networks accelerate initial market entry and broaden geographic reach, while social networks play only a marginal role. Strategic entrepreneurship, particularly through frugal innovation, learning, and alliances, enables firms to expand and sustain international operations over time. Government support mechanisms, such as trade fair subsidies and export grants, play a critical role in reducing entry barriers and extending foreign market reach, although their effect on scale remains limited.Republic of Trkiye's Ministry of National Education through the YLSY ScholarshipThis study is derived from the doctoral dissertation titled A Holistic Approach to Internationalisation: Motives, Enablers and Patterns of Emerging Market SMEs, conducted within the PhD programme at the University of St Andrews School of Management. The authors also gratefully acknowledge the support and sponsorship of the Republic of Turkiye's Ministry of National Education through the YLSY Scholarship, which has been instrumental in enabling this study
Investigation of the effects of hydrogen addition to fusel oil-diesel fuel blends on combustion characteristic and emissions
Get PDFHer geçen gün artan enerji ihtiyacı ve kullanılan enerji kaynaklarının oluşturduğu çevre kirliliğinin artmasıyla petrol esaslı yakıtların yerini alabilecek yeni ve yenilenebilir enerji kaynakları çalışmaları hızla artmaktadır. Petrole alternatif olarak kullanılan yakıtlar arasında tercih edilen alkol bazlı yakıtların içten yanmalı motorlarda kullanılmasıyla ilgi çalışmaların son zamanlarda hızla arttığını görmekteyiz. Fuzel yağı alkol üretiminde damıtma işleminde elde edilen bir üründür. Bu çalışmada, öncelikle fuzel yağı (F) dizel yakıtına (D) hacimsel olarak %15 oranında katılarak F15 yakıtı elde edilmiştir. Ek yakıt olarak emme manifoldundan farklı akış debilerde (10, 20 ve 30 L/dak) hidrojen gazı verilerek test yakıtları elde edilmiştir. Test yakıtları sırasıyla D, F15, F15+10 Lpm H2, F15+20 Lpm H2 ve F15+30 Lpm H2 olarak adlandırılmıştır. Elde edilen test yakıtlarının 3 silindirli, su soğutmalı ve ön yanma odalı dizel bir motorda yanmaya, performansa ve emisyonlara olan etkileri deneysel olarak incelenmiştir. Deneyler sabit 2000 d/d sabit motor devrinde ve farklı motor yüklerinde (15, 30, 45 ve 60 Nm) gerçekleştirilmiştir. İlk deneyler referans verileri elde etmek için dizel yakıtı (D) ile yapılmıştır. Daha sonra diğer test yakıtları ile aynı şartlar altında deneyler gerçekleştirilmiştir.With the increasing need for energy and the increasing environmental pollution caused by the energy sources used, studies on new and renewable energy sources that can replace petroleum-based fuels are increasing rapidly. We see that the studies on the use of alcohol-based fuels, which are preferred among the fuels used as an alternative to petroleum, in internal combustion engines have recently increased rapidly. Fuzel oil is a product obtained in the distillation process in alcohol production. In this study, F15 fuel was obtained by adding 15% by volume of fusel oil (F) to diesel fuel (D). As an additional fuel, hydrogen gas was introduced from the intake manifold at different flow rates (10, 20 and 30 L/min) and test fuels were obtained. The test fuels were named as D, F15, F15+10 Lpm H2, F15+20 Lpm H2 and F15+30 Lpm H2, respectively. The effects of the obtained test fuels on combustion, performance and emissions in a 3-cylinder, water-cooled, pre-combustion chamber diesel engine were investigated experimentally. The experiments were carried out at a constant engine speed of 2000 rpm and different engine loads (15, 30, 45 and 60 Nm). Initial experiments were carried out with diesel fuel (D) to obtain reference data. Then the experiments were carried out with other test fuels under the same conditions
Beyond the bills: Uncovering multidimensional energy poverty in Turkey
Get PDFThe aim of this paper is to shed light on the extent of energy poverty in Turkey with the help of Alkire-Foster multidimensional poverty index. While previous studies mainly used unidimensional approaches or analyzed several indicators in isolation, this study integrates different indicators to provide a more comprehensive understanding. To this end, this paper analyses data from the Survey on Income and Living Conditions conducted by the Turkish Statistical Institute from 2006 to 2020. The results indicate a decline in multidimensional energy poverty during the study period. The use of traditional energy resources, which is measured by the fuel type indicator, contributed the most to the index. The regional analysis reveals that the Mediterranean, Southeastern Anatolia, Eastern Black Sea and Northeast Anatolia regions have the highest levels of multidimensional energy poverty. These results underscore the geographical disparities in energy access and consumption patterns in Turkey and highlight the need for targeted policy measures in these regions
The concept of masculinity through the lens of hegemonic masculinity in Turkish cinema: The phenomenon/change/transformation of masculinity in Eşkıya, Gemide, Ağır Roman
Get PDFSinema, bir iletişim aracı ve sanat dalı olarak toplumun anlam ve değerlerini yansıtırken, aynı zamanda bu unsurların yeniden üretimine katkıda bulunur. Ataerkil düzeni ve hegemonik erkekliği pekiştiren bir iktidar aracı olarak sinema, bu yapıların yeniden üretiminde sürekli kılar. Günümüzde, toplumsal cinsiyetin dinamiklerinde meydana gelen değişimlerle birlikte, ataerkil yapılar ve bunlara dayalı erkeklik anlayışları ciddi bir dönüşüm sürecine girmiştir. Bu dönüşüm, yalnızca toplumsal alanda değil, aynı zamanda kültürel üretim alanlarında da etkisini göstermektedir. Sinema, toplumsal gerçeklikleri yansıtan güçlü bir sanat formu olarak, erkeklik kimliğinin evrimini ve hegemonik erkekliğin yeniden üretim süreçlerini izlemek için verimli bir alan sunmaktadır. Hegemonik erkeklik, öncelikle toplumsal cinsiyet bağlamında tarihsel bir perspektifle ele alınmakta, ardından kavram, Türk Sinemasında erkeklik teması bağlamında incelenerek, nitel metin çözümlemelerinden biri olan betimsel analiz yöntemi çerçevesinde çözümlenmektedir. Bu tez çalışmasında, Türk sinemasının düşünsel, kurgusal ve pratik gücünün önemi ele alınmış ve filmler, erkeklik olgusu ile bu olgudaki değişimler doğrultusunda toplumsal cinsiyet bağlamında, hegemonik erkeklik kavramı çerçevesinde incelenmiştir. Çalışma kapsamında 1990'lar Türk Sineması'ndan örneklem olarak seçilen Eşkıya (1996), Gemide (1997) ve Ağır Roman (1998) filmlerinde erkeklik imgesi irdelenmiştir. Bu filmler, erkek karakterlerin karşılaştıkları toplumsal ve bireysel normlar aracılığıyla geleneksel erkeklik anlayışlarını sorgularken, çoğu zaman bu krizlerden sonra hegemonik erkekliğin yeniden inşa edildiği bir sürecin işlediğini ortaya koymaktadır. Özellikle güç, iktidar ve duygusal derinlik gibi temalar etrafında şekillenen bu dönüşüm, erkekliğin yalnızca krizlere uğramadığını, aynı zamanda erkeklik anlayışlarını olgusunu pekiştiren bir yeniden üretim sürecine dönüştüğünü gözler önüne serer. Son olarak çalışmanın odağını oluşturan hegemonik erkeklik kavramının, sinema üzerinden sürekliliğini sağlayan bulguların yeniden üretilip üretilmemesi konusu tartışılmış ve Türk Sinemasında toplumsal cinsiyet rolleri üzerindeki etkisi erkeklik temsillerinin hegemonik normlarla ilişkisi ele alınmıştır. Erkeklik, toplumsal cinsiyet, hegemonik erkeklik ve homososyallik gibi kavramlarla analiz edilerek, erkeklerin toplumsal konumları, iktidarları ve baskı altındaki durumları ortaya konmuştur. Erkeklerin hem ezen hem de ezilen rollerinde bulunabildiği vurgulanmış ve erkeklik temsillerindeki krizler, bu kimliklerin toplumda nasıl doğallaştırıldığını göstermiştir. Hegemonik erkeklik, toplumsal cinsiyet düzeninde bir norm olarak kabul edilirken, ideal erkeklik ise toplumdan topluma değişen ve hedeflenen bir erkeklik biçimi olarak tanımlanmıştır. Bu bağlamda hem bireysel hem de toplumsal düzeyde sürekli yeniden üretilen ve doğal hale getirilen toplumsal yapılar yansıtılmıştır.Cinema, as a means of communication and an art form, reflects the meanings and values of society while simultaneously contributing to their reproduction. As a tool of power that reinforces patriarchal order and hegemonic masculinity, cinema perpetuates these structures through their continuous reproduction. In recent times, with the changes in the dynamics of gender, patriarchal structures and the masculinity concepts based on them have undergone a significant transformation. This transformation is evident not only in the social sphere but also in areas of cultural production. As a powerful art form reflecting social realities, cinema offers a fertile ground for observing the evolution of masculine identity and the reproduction processes of hegemonic masculinity. Hegemonic masculinity is first examined in a historical perspective within the context of gender, followed by an analysis of masculinity themes in Turkish cinema through the descriptive analysis method, one of the qualitative text analysis techniques. Subsequently, this thesis addresses the intellectual, narrative, and practical significance of Turkish cinema; the films are analyzed through the lens of masculinity and its changes within the framework of hegemonic masculinity in the context of gender. The selected sample focuses on the representation of masculinity in three Turkish films from the 1990s: Eşkıya (1996), Gemide (1997), and Ağır Roman (1998). These films explore traditional masculinity by portraying male characters who confront societal and individual norms, often revealing that these crises lead to a process where hegemonic masculinity is reconstructed. Particularly through themes such as power, authority, and emotional depth, this transformation demonstrates that masculinity does not merely experience crises but also evolves into a process that reinforces traditional masculinity concepts. Finally, the study discusses whether the findings on the perpetuation of hegemonic masculinity through cinema are reproduced and examines the impact of Turkish cinema on gender roles in the context of the relationship between masculinity representations and hegemonic norms. By analyzing concepts such as masculinity, gender, hegemonic masculinity, and homosociality, the study highlights the societal positions, powers, and suppressed states of men. It emphasizes that men can occupy roles as both oppressors and the oppressed, illustrating how crises in masculinity representations naturalize these identities in society. Hegemonic masculinity is accepted as a norm within the gender order, while ideal masculinity is defined as a targeted form of masculinity that varies from society to society. In this context, societal structures that are continuously reproduced and naturalized at both individual and societal levels are reflected
An improved bound for 2-distance coloring of planar graphs with girth six
Get PDFA vertex coloring of a graph G is said to be a 2-distance coloring if any two vertices at distance at most 2 from each other receive different colors, and the least number of colors for which G admits a 2-distance coloring is known as the 2-distance chromatic number chi(2)(G) of G. When G is a planar graph with girth at least 6 and maximum degree triangle >= 6, we prove that chi(2)(G) <= triangle+4. This improves the best known bound for 2-distance coloring of planar graphs with girth six. (c) 2024 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.TUBITAK (The Scientific and Technological Research Council of Turkey) [122F250]Acknowledgments This research was supported by TUBITAK (The Scientific and Technological Research Council of Turkey) under the project number 122F250. The author thanks the anonymous referees for their constructive comments, which have improved the presentation of this manuscript
Phenotypic variability in cases with CACNA1A mutation
Get PDFThe purpose of this study was to enhance understanding of CACNA1A gene variants by elucidating the clinical profiles of patients with different variants. The overlapping features and varying phenotypic characteristics of these neurological disorders pose challenges for clinicians. A data collection form was utilized to gather clinical features, examination details, and treatment information associated with CACNA1A variants. Thirty-one patients were included in the study from 11 different clinics in Turkey. Cases were assessed by comparing their information with existing literature. The study initially included 32 patients from 29 families, with 31 patients meeting the inclusion criteria. Clinical manifestations ranged from congenital onset hypotonia to motor seizures. Within the group of patients, 87% were diagnosed with epilepsy, 61% had neurodevelopmental defects, 32% experienced ataxia, 22% had eye movement problems, 16% suffered from migraines, and 13% had recurrent encephalopathy. Thirty percent of individuals exhibited cerebellar atrophy. A subset of individuals exhibited various forms of cognitive impairment and different kinds of ataxia.Conclusion: CACNA1A variants can lead to structural and functional abnormalities in the Cav2.1 channels, resulting in paroxysmal and/or chronic clinical presentations. The overlapping phenotypes and variable features among family members suggest the influence of environmental factors and modifier genes. A thorough understanding of the range of phenotypic variants and the difficulties encountered by medical professionals is essential for precise diagnosis and efficient treatment approaches in various neurological conditions. Additional research is necessary to clarify the underlying mechanisms that contribute to the various presentations of these variants. What is known:center dot Variants in the CACNA1A gene disrupt calcium signaling, thereby impacting fundamental developmental processes such as neuronal differentiation, migration, and synapse formation.center dot Variants in the CACNA1A can lead to neurodevelopmental disorders characterized by intellectual disability, learning difficulties, memory challenges, and problems in social interaction.What is new:center dot Instances of intrafamilial variability in CACNA1A variants have been identified, with differing clinical manifestations exhibited by affected family members.center dot Incomplete penetrance is a phenomenon that may occur, as neurodevelopmental or neuropsychiatric findings are not exhibited by some patients with CACNA1A variants.Scientific and Technological Research Council of Turkiye (TUBIdot;TAK)Open access funding provided by the Scientific and Technological Research Council of Turkiye (TUB & Idot;TAK)
Investigation of glass fiber reinforced concretes with different fiber length and weight fraction by fracture energy and non-destructive methods
Get PDFFracture energy test, non-destructive investigation, some of the physical and mechanical tests, and microstructural examinations were performed on GRC (glass fiber-reinforced concrete) with different fiber length and weight fractions. Alkaline-resistant glass (AR-GF) fibers with 6, 12, and 19 mm lengths were evaluated to produce GRCs. Weight fractions of 0.7 wt%, 1.3 wt%, and 2.0 wt% AR-GF fibers were used in the GRC mixtures. Fracture tests were performed on Single Edge Notched Beams (SENBs) to investigate fracture energy, crack resistance index (CRI), and flexibility index (FI) of GRCs. Dynamic modulus of elasticity and damping ratios of the GRCs were determined by performing resonant frequency tests on the SENB samples by ASTM C215 standard. In addition, compressive strength, static modulus of elasticity, electrical resistivity, ultrasonic pulse velocity (UPV), Schmidt hammer, and density tests were also performed on the cylindrical samples produced. Field Emission Scanning Electron Microscopy (FE-SEM) and Fourier Transform Infrared (FTIR) analyses were performed to examine the microstructure of the GRC matrix in this study. Test results revealed that the mixtures containing 12 mm long fiber at 2.0 wt% dosage exhibited superior fracture energy by cracking resistance and flexibility index. Dynamic test results showed that the increase in fiber length and ratio increased the damping ratio of GRCs. In sum, with the study, it came out that fiber length had more significant relations with the experimental results once compared to the weight of fiber content. © 2025 Elsevier B.V., All rights reserved