30 research outputs found

    Creep modelling of polypropylenes using artificial neural networks trained with Bee algorithms

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    Polymeric materials, being capable of high mouldability, usability of long lifetime up to 50 years and availability at low cost properties compared to metallic materials, are in demand but finite element-based design engineers have limited means in terms of the limited material data and mathematical models. In particular, in the analysis of products with complex geometry, the stresses and strains of various amounts formed in the product should be known and evaluated in terms of a precise design of the product to fulfil life expectancy. Due to time and cost constraints, experimental data cannot be available for all cases required in analysis, therefore, finite element method-based simulations are commonly used by design engineers. This is also computationally expensive and requires a simpler and more precise way to complete the design more realistically. In this study, the whole creep behaviour of polypropylene for all stresses were obtained with 10% accuracy errors by artificial neural networks trained using existing experimental test results of the materials for a particular working range. The artificial neural network model was trained with traditional as well as heuristic based methods. It is demonstrated that heuristically trained ANN models have provided much accurate and precise results, which are in line with 10% accuracy of experimental data

    Ayak bileği akut lateral bağ yaralanmalarında ortez tedavi

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    Bu tezin, veri tabanı üzerinden yayınlanma izni bulunmamaktadır. Yayınlanma izni olmayan tezlerin basılı kopyalarına Üniversite kütüphaneniz aracılığıyla (TÜBESS üzerinden) erişebilirsiniz.[Abstarct Not Available

    The Social Exclusion Fact in Franz Kafka’s ‘’The Metamorphosis ‘’ / Franz Kafka’nın Dönüşüm’ünde Sosyal Dışlanmışlık Olgusu

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    There is a strong relationship between the individual and society. Individuals comes together to form society and lives within this social structure in which they have formed their lives. In this context, relations and contradictions arise between the individual and society. Social exclusion is also described as a phenomenon that arises from contradictions between the individual and the society. Social exclusion is a concept that became known after 1970’s and is defined as the situation in which an individual can not integrate with the society due to various reasons and is excluded from social life. Literary works’s ability to present details the relations and contradictions between the individual and the society makes it possible to establish a coperation beetween literature and social sciences. Thus, in this study Franz Kafka’s The Metamorphosis (1915) novel was examined within the context of the concept of social exclusion. The story of Gregor Samsa, the hero of the novel, is a story of social exclusion, in which Gregor Samsa was treated as a social exclusionary individual and his family as a micro-scale society. The contradictions leading to social exclusion between society and the individual have been tried to be revealed by analyzing the discourse of heroes of the novel. This work, which has been done, aims to present a different perspective to the The Metamorphosis (1915) novel from previous works

    Kronik sklerozan osteomiyelit tedavisinde oluklaştırma ve kas taşıma tekniğinin uzun dönem sonuçları

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    Objectives: We evaluated long-term results of treatment including creation of a gutter and muscle transposition in patients with chronic sclerosing osteomyelitis (CSO). Methods: Between 1980 and 1996, 11 patients (5 women, 6 men; mean age 36 years; range 17 to 69 years) with CSO were treated with creation of a gutter and muscle transposition. Seven patients had femoral, and four patients had tibial involvement. The main complaint was pain. The patients were evaluated with respect to complaints and radiologically (X-ray, computed tomography, and magnetic resonance imaging) after a mean follow-up of 12.4 years (range 6 to 24 years). Results: During the follow up period, all the patients remained symptom-free without the need for antibiotic treatment except for one patient with tibial involvement, whose pain recurred after ;amp;#64257;ve years. The patient;amp;#8217;s complaint disappeared following reoperation with the same technique. Histologic examination of surgical biopsies showed nonspeci;amp;#64257;c changes consistent with low-grade chronic osteomyelitis. Cultures were negative in all cases. Control radiographies showed no progression of sclerosis. Computed tomography showed cortical bone formation surrounding the transposed muscle, and magnetic resonance imaging showed fatty degeneration in the transposed muscle, without any signs of active osteomyelitis. Conclusion: The aim of gutter creation and muscle transposition is to increase blood supply to the diseased bone segment, without the need for microsurgical interventions and secondary reconstructive procedures. Our long-term results show that this technique is ef;amp;#64257;cacious in patients with femoral and tibial involvement.Amaç: Kronik sklerozan osteomiyelit (KSO) tedavisinde oluklaştırma ve kas taşıma tekniğinin uzun dönem sonuçları değerlendirildi. Çalışma planı: 1980-1996 yılları arasında, KSO’lu 11 hasta (5 kadın, 6 erkek; ort. yaş 36; dağılım 17-69) oluklaştırma ve kas taşıma tekniği ile tedavi edildi. Yedi hastada femur, dört hastada tibia tutulumu vardı. Tüm olgularda temel yakınma ağrı idi. Ortalama 12.4 yıl (dağılım 6-24 yıl) olan takip süresi sonunda yakınmaları sorgulanan hastalar düz gra?ler, bilgisayarlı tomogra? ve manyetik rezonans görüntüleme ile değerlendirildi. Sonuçlar: Takip süresi içinde bir olgu dışında hiçbir olguda semptomlarda tekrarlama ve antibiyotik gereksinimi olmadı. Tibia tutulumlu bir hastada ameliyattan beş yıl sonra ağrının tekrarladığı görüldü. Bu hasta aynı teknikle tekrar ameliyat edildi ve sonrasında herhangi bir sorunla karşılaşılmadı. Ameliyattalınan biyopsilerin patolojik incelemesinde spesi?k olmayan, düşük dereceli kronik osteomiyelit bulguları saptandı. Kültürlerde ise üreme olmadı. Kontrol radyogra?lerinde kemikteki sertleşmede ilerleme görülmedi. Bilgisayarlı tomogra?de taşınan kas kitlesi çevresinde kortikal kemik oluşumu, manyetik rezonans görüntülerinde ise taşınan kas yapısında yağlı dejenerasyon geliştiği izlendi. Hiçbir olguda aktif osteomiyelit bulgusuna rastlanmadı. Çıkarımlar: Oluklaşt ırma ve kas taşıma tekniğinde amaç, mikrocerrahi girişimlere ve ikincil rekonstrüktif girişimlere ihtiyaç duyulmadan, tutulmuş kemik bölümündeki kanlanmayı artırmaktır. Uzun dönem sonuçlarımız, femur ve tibia tutulumlu olgularda bu tekniğin etkili olduğunu göstermektedir

    Long-term results of treatment including creation of a gutter and muscle transposition for chronic sclerosing osteomyelitis

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    Amaç: Kronik sklerozan osteomiyelit (KSO) tedavisinde oluklaştırma ve kas taşıma tekniğinin uzun dönem sonuçları değerlendirildi. Çalışma planı: 1980-1996 yılları arasında, KSO’lu 11 hasta (5 kadın, 6 erkek; ort. yaş 36; dağılım 17-69) oluklaştırma ve kas taşıma tekniği ile tedavi edildi. Yedi hastada femur, dört hastada tibia tutulumu vardı. Tüm olgularda temel yakınma ağrı idi. Ortalama 12.4 yıl (dağılım 6-24 yıl) olan takip süresi sonunda yakınmaları sorgulanan hastalar düz gra?ler, bilgisayarlı tomogra? ve manyetik rezonans görüntüleme ile değerlendirildi. Sonuçlar: Takip süresi içinde bir olgu dışında hiçbir olguda semptomlarda tekrarlama ve antibiyotik gereksinimi olmadı. Tibia tutulumlu bir hastada ameliyattan beş yıl sonra ağrının tekrarladığı görüldü. Bu hasta aynı teknikle tekrar ameliyat edildi ve sonrasında herhangi bir sorunla karşılaşılmadı. Ameliyattalınan biyopsilerin patolojik incelemesinde spesi?k olmayan, düşük dereceli kronik osteomiyelit bulguları saptandı. Kültürlerde ise üreme olmadı. Kontrol radyogra?lerinde kemikteki sertleşmede ilerleme görülmedi. Bilgisayarlı tomogra?de taşınan kas kitlesi çevresinde kortikal kemik oluşumu, manyetik rezonans görüntülerinde ise taşınan kas yapısında yağlı dejenerasyon geliştiği izlendi. Hiçbir olguda aktif osteomiyelit bulgusuna rastlanmadı. Çıkarımlar: Oluklaşt ırma ve kas taşıma tekniğinde amaç, mikrocerrahi girişimlere ve ikincil rekonstrüktif girişimlere ihtiyaç duyulmadan, tutulmuş kemik bölümündeki kanlanmayı artırmaktır. Uzun dönem sonuçlarımız, femur ve tibia tutulumlu olgularda bu tekniğin etkili olduğunu göstermektedir.Objectives: We evaluated long-term results of treatment including creation of a gutter and muscle transposition in patients with chronic sclerosing osteomyelitis (CSO). Methods: Between 1980 and 1996, 11 patients (5 women, 6 men; mean age 36 years; range 17 to 69 years) with CSO were treated with creation of a gutter and muscle transposition. Seven patients had femoral, and four patients had tibial involvement. The main complaint was pain. The patients were evaluated with respect to complaints and radiologically (X-ray, computed tomography, and magnetic resonance imaging) after a mean follow-up of 12.4 years (range 6 to 24 years). Results: During the follow up period, all the patients remained symptom-free without the need for antibiotic treatment except for one patient with tibial involvement, whose pain recurred after five years. The patient’s complaint disappeared following reoperation with the same technique. Histologic examination of surgical biopsies showed nonspecific changes consistent with low-grade chronic osteomyelitis. Cultures were negative in all cases. Control radiographies showed no progression of sclerosis. Computed tomography showed cortical bone formation surrounding the transposed muscle, and magnetic resonance imaging showed fatty degeneration in the transposed muscle, without any signs of active osteomyelitis. Conclusion: The aim of gutter creation and muscle transposition is to increase blood supply to the diseased bone segment, without the need for microsurgical interventions and secondary reconstructive procedures. Our long-term results show that this technique is efficacious in patients with femoral and tibial involvement

    X-ray structure determination, Hirshfeld surface analysis, spectroscopic (FT-IR, NMR, UV-Vis, fluorescence), non-linear optical properties, Fukui function and chemical activity of 4 '(2,4-dimethoxyphenyl)-2,2 ':6 ',2 ''-terpyridine

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    The compound 4'-(2,4-dimethoxyphenyl)-2,2':6',2"-terpyridine (Mtpyr) was synthesized and investigated using X-ray single crystal structure determination, combined with Hirshfeld topology analysis of the molecular packing. In addition, Mtpyr was characterized by experimental and theoretical FT-IR, UV-Vis, H-1 NMR, C-13 NMR and fluorescence emission spectra. The optimized molecular geometry (bond length, bond angle, torsion angle), the complete vibrational frequency and all other theoretical computations were calculated by using density functional theory (DFT) B3LYP method with the help of 6 -311++G(d,p) basis set. From the recorded UV Vis spectrum, the electronic properties such as excitation energies, wavelength and oscillator strength are evaluated by TD-DFT in chloroform solution. The 1H and 13C nuclear magnetic resonance (NMR) chemical shifts of the molecule were calculated by the gauge-independent atomic orbital (GIAO) method and compared with experimental results. The calculated HOMO-LUMO band gap energies confirmed that charge transfer and chemical stability within the molecule. The hyperconjugative interaction energy E-(2) and electron densities of donor (i) and acceptor (j) bonds were calculated using natural bond orbital (NBO) analysis. Besides Mulliken and natural population charges (NPA), non-linear optic properties (NLO), Fukui Function analysis, molecular electrostatic potential (MEP) were also computed which helps to identifying the electrophilic/nucleophilic nature. (C) 2018 Published by Elsevier B.V

    Validity of ultrasonography in surgically treated zone 2 flexor tendon injuries

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    Objectives: The purpose of this study was to determine the validity of ultrasonography (USG) with surgical confirmation in surgically treated zone 2 flexor tendon injuries
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