-
International Journal of Automotive Science And Technology5
-
International Journal of Automotive Engineering and Technologies2
-
The New Journal of Urology2
-
Turkish Journal of Engineering2
-
ESTÜDAM Halk Sağlığı Dergisi1
-
European Mechanical Science1
-
Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi1
-
TÜRKİYE FOTOGRAMETRİ DERGİSİ1
-
Türkiye Fotogrametri Dergisi1
-
Türkiye Lidar Dergisi1
Investigation of The Effect of Solid Lubricant Particle Sizes on Friction and Wear Properties in Friction Composites: An Experimental Case Study with Graphite
Sugözü, İlker | Sugözü, Banu
Friction composites consist of many materials with various properties. Solid lubricant is one of these materials. The task of the solid lubricant in the compo-site is to protect the counter surfaces against wear and to reduce noise and vibra-tion. Typical solid lubricants used in the friction composite are graphite, antimo-ny trisulfide, molybdenum disulfide, copper sulfide, etc. The selection suitable solid lubricants for better braking performance is an important issue, as solid lubricants may decompose at high temperatures, leading to undesirable results. The particle size of the solid lubricant used is at least as important as itself. In this study, the effect of micro and nanoparticle-sized graphite on friction and wear behavior of friction composites was investigated experimentally. ...
Lipoma in the Bladder Mucosa with MRI Supported: Case Report
TURHAN,AHMET | AÇIKAL,TOLGA | AKBAY,ERDEM | YUYUCU KARABULUT,YASEMİN | MELEMEZOĞLU,DAMLA | APAYDIN,F. DEMİR
Abstract Lipomas are typically encapsulated benign tumors found in the skin, central nervous system, or gastrointestinal system. Lipomas of the bladder wall are rare tumors with limited reported cases. We present a case of a 62-year-old male patient who presented to our outpatient clinic with complaints of hematospermia. During two pelvic magnetic resonance imaging (MRI) scans conducted ten months apart and a diagnostic cystourethroscopy, a 7 mm lesion was incidentally found on the dome of the bladder and was resected for further examination. Follow-up MRI revealed that the size of the lesion remained unchanged. In spite of their rarity, bladder wall lipomas should be considered in the differential diagnosis of bladder tumors. Keywords: bladder lipoma, hematospermia, tumor
İnsan Yüzünün 3 Boyutlu Modellenmesinde Akıllı Telefonların Kullanılması
Fidan,, Doğa | Ulvi, Ali
Metrik fotoğraf makinelerinin ve fotogrametrik kamera lenslerinin satın alma maliyetleri oldukça yüksektir. Bunun aksine akıllı telefonlar, kullanıcılar tarafından kolay ulaşılabilir ve uygun maliyetli bir veri toplama imkânı sağlamaktadır. Bu doğrultuda akıllı telefonlar, fotogrametriyle bütünleştirildiğinde 3B modelleme süreçlerine esneklik sağlamakta, düşük maliyetli bir çözüm sunmaktadır. SfM (Structure from Motion), fotogrametrik görüntü eşleştirme yöntemi olarak bilinmekte, nesnelerin yapısal özelliklerini analiz etmek ve 3B modeller oluşturmak için kullanılmaktadır. Çalışmada tüketici sınıfı bir dijital kamera kullanılarak elde edilen fotoğraf kümelerinden minimum iş yüküyle gerçekçi ve dijital 3B yüz modelinin üretilmesi amaçlanmaktadır. Bu çalışmada, iPhone 14 Pro Max akıllı telef...
Modeling and Predicting of Tribological Behaviour of the Automotive Brake Pad Using Response Surface Methodology
Sugözü, Banu
In the present study, wear and frictional behaviours of automotive brake pad sliding against GG 20 cast iron counter face have been investigated experimentally using a pin on disc type friction tester. Wear tests were carried out under dry conditions. A central composite design was used to describe response and to estimate the process parameters in the model. Empirical models have been developed to predict wear loss and friction coefficient as a function of contact pressure and sliding velocity using multiple regression. The statistical analysis show that the contact pressure is identified as the most dominant factor affecting wear loss, sliding velocity is identified is the most dominant factor affecting friction coefficients.
Investigation of the Use of a New Binder Material in Automotive Brake Pad
Sugözü, Banu | Sugözü, İlker
In this study, the usability of waste banana peel and banana tree bark with a fibrous structure as binders was investigated experimentally. Ac-cordingly, the amount of fiber, friction regulator, filler, abrasive and sol-id lubricant is fixed, and three different brake pad samples were pro-duced by adding 10% banana peel and 10% banana tree bark powders by reducing the amount of phenolic resin. Production was carried out by conventional dry mixing method and powder metallurgy method. For this, firstly a homogeneous mixture of all ingredients is provided. The mixture transferred to the mold was pressed at room temperature firstly. Samples obtained as the first form were subjected to hot pressing in the mold again. Thus, the ability of the resin to hold all the materials together has become a...
Kültürel Mirasların Korunmasına Yönelik LiDAR ve İHA Fotogrametrisi Yöntemlerinin Birlikte Kullanımı
Balcı, Davut | Ulvi, Ali
Bu çalışmada, Türkiye'deki Mersin İli Tarsus İlçesindeki Tarihi Nusret Mayın Gemisi örnek alınarak yersel lazer tarama ve İHA fotogrametri nokta bulutu verilerinin karşılaştırılması ve entegrasyonu gerçekleştirilmiştir. Bu çalışmanın temel amacı, yersel lazer tarayıcıdan elde edilen bir nokta bulutu ile İHA fotogrametriden elde edilen bir nokta bulutu arasındaki farkların değerlendirilmesidir. Ayrıca, biri geleneksel yaklaşımla diğeri yeni bir çakıştırma yaklaşımıyla üretilen iki bütünleşik nokta bulutunun doğrulukları araştırılmıştır. Kültürel miras dokümantasyonu alanında amaç, ilgilenilen nesnenin eksiksiz ve doğru bir 3B modelini oluşturmaktır. Bu çalışmadaki gibi kompleks yapıdaki büyük nesnelerin sayısallaştırılması isteniyorsa, tüm alanlarda veri kapsamının garanti edilmesi gerekir....
Hundreds of Ileal Condylitis Stones
TURHAN,AHMET | BAŞARANOĞLU,MERT | AKBAY,ERDEM
Abstract CASE REPORT One of the long-term complications of urinary diversion, urolithiasis, is influenced by factors such as bacterial colonization, urinary stasis, mucus, and anatomical abnormalities. Stones are typically observed in the upper urinary tract, and they are rarely seen in the ileal conduit. Although endoscopic surgery can be used for the treatment of stones in the ileal conduit, it is predominantly treated with open surgery. We report a 28-year-old male patient with 282 urinary stones, the largest of which measures 8 cm, found in the ileal conduit. The case is evaluated in terms of treatment and surgical approaches.
Friction and Wear Behavior of Fiber Reinforced Polymer-Matrix Composites Containing Ulexite and Pinus Brutia Cone Dust
Sugözü, Banu
In this study, the usability of ulexite and pinus brutia cone dust (PBCD) in friction composites were investigated experimentally. Polymer-matrix composite (PMC) samples were manufactured by powder metallurgy method. Produced samples with the same contents were compared with those of heat-treated. A special design friction tester was used to determine friction properties such as wear rate and friction coefficient. The results showed that ulexite and PBCD can be used as filler material in friction composites. The results also indicated that heat treatment improved the properties of the samples.
2023 Kahramanmaraş ve Hatay depremlerinin Antakya ve Samandağ ilçelerindeki yapısal etkileri ve çözüm önerileri
Akın, Emre | Kara, İlker Fatih
06.02.2023 tarihinde Doğu Anadolu Fay Zonu (DAFZ) üzerinde yerel saat 04:17’de Mw: 7.7 büyüklüğünde ve yerel saat 13:24’de Mw: 7.6 büyüklüğünde olan Kahramanmaraş merkezli iki adet büyük şiddetli depremler meydana gelmiştir. Bu depremlerden sonra 20.02.2023 tarihinde Ölü Deniz Fayı üzerinde yerel saat 20:04’te Mw: 6.4 büyüklüğünde Hatay merkezli yıkıcı bir deprem daha meydana gelmiştir. Bu depremlerden en çok etkilenen bölgelerin başında Hatay ili gelmektedir. Bu çalışmada depremden sonra Hatay’ın Antakya ve Samandağ ilçelerinde bulunan yapılardaki hasarlar gözleme dayalı olarak değerlendirilmiştir. Oluşan hasarların sayısı göz önüne alındığında bölgedeki yapı stoğunun depreme karşı yetersiz olduğu anlaşılmaktadır. Deprem yönetmeliklerine uygun olarak yapılan binaların yıkılmadığı ve diğer...
Türk Motiflerinin Fotogrametrik Yöntemlerle Dijitalleştirilmesi ve Arşivlenmesi
Ulvi, Ali
Tarih boyunca geniş coğrafi alana yayılan Türklerin temellerini attığı düşünülen dokuma sanatı, bir toplumun kültürünü yansıtmada ve aktarmada önemli bir araç olarak kullanılabilmektedir. Farklı kültürlere ev sahipliği yaptığı için bu dokumalar, teknikleri ve desenleri bakımından çok çeşitlilik göstermektedir. Dokunan halı, kilim, heybe, vb. motifler bir anlamda dokuyanların mesajlarını ve içinde bulunduğu, ruh halini, özlemlerini, dileklerini, acılarını, inançlarını, anılarını kısacası bütün yaşamlarını paylaştığı sembolik mesajlarla doludur. Bu sebeptendir ki bir toplumun kültürünü aktaran dokuma motiflerini barındıran tarihi eserler belge niteliğinde tanımlanabilmektedir. Bu yüzden kültürü gelecek nesillere aktarmada önemli bir araç olarak kullanılabilecek bu eserleri sanal ortamda koru...
Influence of Diesel Fuel and Soybean Oil Ethyl Ester Blends on the Performance and Emission Characteristics of a Diesel Engine
Sugözü, Banu
In this study, blends of soybean oil ethyl ester and diesel fuel are tested as alternative fuel in a single cylinder, air cooled pre-combustion chamber diesel engine at different speeds and their effects on engine performance and emissions are analyzed. It is observed that the average moment obtained by 5% soybean oil ethyl ester and diesel fuel blend (SOE5) is 0.53% lower, the level of power obtained is 1.8% lower; however, specific fuel consumption is approximately 4.31% higher than those of diesel fuel. In the experiments conducted with 20% soybean oil ethyl ester and diesel fuel blend (SOE20), it is observed that the average moment is 1.74% lower, the level of power obtained is 5.91% lower; however, specific fuel consumption is approximately 10.94% higher than those of diesel fuel. Mor...
Investigation of Friction and Wear Behavior of Boron Carbide Reinforced Composite Materials
Sugözü, Banu | Sugözü, İlker
In this study, the usability of boron carbide as a reinforcement material in friction composites was investigated experimentally. Hence, composite samples containing different amounts of boron carbide (5%, 10% and 15%) were produced and compared with boron carbide-free sample. Friction and wear tests were determined by a full scale brake friction tester according to TS 555 and TS 9076 standards. The hardness of the samples was calculated by Rockwell hardness tester and the density was calculated according to Archimedes' principle. The results showed that boron carbide could be used as a reinforcement material in friction composites.
Investigation of Usage of Milled Pine Cone in Brake Pads
Sugözü, İlker | Sugözü, Banu
Automotive brake pads are polymer composites containing polymer matrix and various fibers and obtained by mixing and pressing different powder materials. Each material added to the content has one or more tasks. Therefore, the properties and quantities of the materials added to the content are very important in terms of braking performance. In this study, the use of milled pinus brutia cone and pinus nigra cone from the pine cone family in the automotive brake pad was investigated experi-mentally. First of all, cones are ground and powdered. The milled 10% pinus brutia cone and 10% pinus nigra cone were added to the pad com-ponent. The performance tests of the pads were carried out on pin on disk type test device. Friction coefficient, wear, density and hardness tests of the pads were done...
Friction and Wear Properties of Automobile Brake Linings Containing Borax Powder with Different Grain Sizes
Sugözü, İlker | Sugözü, Banu
Borax which is an important boron compound, a mineral, and a salt of boric acid, is used as a fire retardant and insulating material. The most important reac-tion in automobile brake systems is heat generation from friction. The heat gen-erated at the interface of disc and lining may cause deformation of the materials forming the lining. Therefore, phenomena such as lining wear and brake fade may be occurred. The aim of this study is to reveal the positive effects of borax additive on lining and experimentally examine the effect of grain size of borax on tribological properties. Lining is produced by mixing more than one powder materials and pressing cold and hot. The size and homogeneous mixture of pow-der materials affect the braking performance. In this study, the effect of using nano a...
AN INTEGRATED APPROACH BASED ON THE TAGUCHI METHOD AND RESPONSE SURFACE METHODOLOGY TO OPTIMIZE PARAMETER DESIGN OF ASBESTOS-FREE BRAKE PAD MATERIAL
Sugözü, Banu
Braking pressure and sliding velocity can affect wear behavior of brake pad material, so sliding velocity and braking pressure is often regarded as the key factor in defining quality performance of this material. For this reason, Taguchi Method has been used to screen the variables that have significant effects on the wear rate. Furthermore, an integrated approach of Taguchi Method and Response Surface Methodology has been employed to improve an empirical model for predicting wear rate and optimization of control factors. It has been observed that an integrated approach based on Taguchi Method and Response Surface Methodology gives 15.45% lower wear rate as compared to optimal results obtained from Taguchi method.
INVESTIGATION OF ULEXITE USAGE IN AUTOMOTIVE BRAKE FRICTION MATERIALS
Sugözü, Banu
The automotive brake pads are multi-component composites made up of many materials. There are many studies in the literature exploring the use of many different materials in brake pads. In this study, the use of ulexite which is a commercially valuable derivatives of boron that 65% of the total world reservations exists in Turkey were researched for brake pad material. For this purpose, three brake pad specimens containing ulexite differing in amount (3, 6 and 9 wt.%) were produced by a conventional procedure for a dry formulation following dry-mixing, pre-forming and hot pressing. The density of the specimens was determined based on Archimedes principle in water. The surface hardness of all brake pad specimens was measured using Rockwell hardness tester. The friction performance of the br...