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Bulunan: 117 Adet 0.002 sn
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Erişime Açık

Surface modification of micronized quartz powders and investigation of additives as filling material in polymer matrix composite materials Mikronize kuvars tozlarının yüzey modifikasyonunun yapılması ve polimer matrisli kompozit malzemelerde dolgu malzemesi olarak incelenmesi

Akyüz, Orhan

SUMMARYThe interfacing compatibility of the matrix material with the filler material in composite materials is one of the most important factors affecting the performance of the composite. A wide variety of chemical methods are applied to increase the interfacial compatibility of the matrix material with the filler material. The most important of all is the surface modification technique, in which surface-active agents are used to reinforce the matrix-filler bond and where a chemical process is applied to the surface of the filler material.This technique is based on the chemical treatment of t ...Daha fazlası

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Effect of particle size distribution modality of CaCO3 on sealing wide fractures using sepiolite muds CaCo3 parçacık boyut dağılım modalitesinin sepiyolit çamurları kullanılarak geniş çatlakların tıkanmasına etkisi

Tezcan, Meltem

SUMMARYLost circulation is defined as the invasion of naturally fractured and unconsolidated formations by the drilling fluid. Preventing loss circulation is a highly challenging problem while drilling a well. High loss circulation results in cost increase and well instability problems along with the contamination of productive formations. Lost circulation materials (LCMs) are used to prevent partial or total losses through pore throat and fractures. Special LCM treatments may be applied in the case of severe losses for wide fractures. However, the outcomes of all these efforts have not been l ...Daha fazlası

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Integration and testing of the RFID-enabled smart factory RFID-etkin akıllı fabrikanın entegrasyonu ve test edilmesi

Akdağ, İsmail

ABSTRACTWith the development of technology, factory needs in supply chain management from production to customers have started to change. Factories have started to frequently benefit from communication systems in product tracking, warehouse stock control and supply chain management. Radio Frequency Identification (RFID) system is one of the main components of IoT technologies, where data transfer occurs wirelessly and flexibly, instead of traditional tracking and monitoring methods. RFID systems, which are automatic identification systems such as barcode systems used for the last 30 years, off ...Daha fazlası

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Production and characterization of 316L and 316L/SİC hollow fiber membranes sintered in various atmospheres Farklı atmosferlerde sinterlenmiş 316L ve 316L/SİC içi boş fiber membranların üretimi ve karakterizasyonu

Şahin, Ezgi

ÖZETPaslanmaz çelik içi boş fiber membranlar, çevre, kimya ve atık arıtma endüstrilerinde gaz ve sıvı ayrıştırmaları veya partikül filtresi olarak kullanılır. Seramik içi boş fiberlerin yük kapasitesi ve kırılganlığı bu uygulamalar için bir sorundur. Son 5 yılda özellikle paslanmaz çelik membranlarla ilgili çalışmalar artmış ve 300 MPa ve üzeri eğilme mukavemetine, iyi gaz geçirgenliğine ve filtrasyon performansına sahip malzemeler üretilmiştir. Bu tezin amacı, farklı toz boyutlarında, kompozit içeren farklı kompozisyonlarda ve farklı sinterleme atmosferlerinde (argon ve azot/hidrojen) içi boş ...Daha fazlası

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Estimation of annual energy production of coupled vertical-axis wind turbines in a semi-complex terrain Eşli çalışan düşey eksenli rüzgar türbinlerinin yarı karmaşık bir sahadaki yıllık enerji üretiminin değerlendirilmesi

Başer, Ferhat Cem Ferhat Cem

ABSTRACTRecent research shows that the vertical-axis wind turbines (VAWTs) can provide up to 6 - 9 times more power generation in the same footprint area when they are sited in proper configurations in contrast to horizontal-axis wind turbines (HAWT). In order to site wind turbines in a field, it is necessary to do a wind resource assessment (WRA). This assessment provide important inputs for the placement, sizing and design detailing of the wind farm. In addition to the correct determination of the site, it is also critical to place the wind turbines in the most efficient way. When the necess ...Daha fazlası

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Investigation of the cooling system efficiency in aluminum low pressure die casting Alüminyum alçak basınçlı dökümde kullanılan soğutma sisteminin veriminin araştırılması

Yavuz, Hakan

ABSTRACTIn this thesis, the flow rate of air coolers used in low pressure casting method is examined. Low pressure die casting (LPDC) method is used for many types of products. Light alloy wheels, motor housings and pistons are examples of these products. Air-cooling is used to provide directional solidification to avoid casting defects on the casting part. In this study, the flow rate of air-cooling is calculated by using computational fluid dynamics (CFD) methods. After the numerical calculations were confirmed by experimental methods, the affect of the variables on the cooling system flow r ...Daha fazlası

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Growth of zno-ch nanostructures on ito/glass substrates through electrochemical anodization for biosensor applications Biyosensör uygulamaları için elektrokimyasal anotlama yöntemiyle İto/Cam yüzey üzerinde Zno-Kitosan nanoyapıların büyütülmesi

Uzunbayır, Berkant

ABSTRACTIn recent years, the utilization of nanotechnology rapidly developed for the wide range of sciences. Nanomaterials shows unique properties and ZnO nanostructures are the most suitable structures for biosensor applications due to their high surface area and high electrochemical activity. In this project first, we have coated zinc film on to Glass/ITO surface by electrochemical deposition method. Then we have transformed the obtained zinc film to nanostructured ZnO by electrochemical anodization method. At the end, we have tried to modify the ZnO nanostructured surface with chitosan for ...Daha fazlası

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Development of novel donor and acceptor sam molecules for photovoltaic applications Fotovoltaik uygulamalar için yeni nesil donör ve akseptör kendiliğinden organize tek katman moleküllerin geliştirilmesi

Arkan, Emre

ABSTRACTSurface modification of indium tin oxide (ITO) is a crucial factor to alter the energy level barrier between ITO and perovskite that has direct influence on the charge extraction and recombination at interface. This henomenon has further direct effect on device parameters such as open circuit voltage (VOC), fill factor (FF), and short circuit current density (JSC). This study was base on the synthesis of six novel SAM molecules to be used in fabrication of p-i-n type perovskite solar cells. Since proposed SAMs are of push-pull type molecular nature, contiguous thiophene rings were used ...Daha fazlası

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Development of a surgical navigation procedure for cochlear microrobot operations Koklear mikrorobot operasyonları için bir cerrahi navigasyon yönteminin geliştirilmesi

Uslu, Tuğrul

ABSTRACTBy the help of technological advances such as the development of computer and imaging technologies, surgical navigation has started to be used rapidly in medical literature. It is one of the recent methods used to track surgical tools inside the operation volume. In light of vital advantages as operation safety, minimally invasive application compatibility, reduction of operation times and reduced post operation complication risks, surgical navigation has been rapidly adopted throughout the relevant fields. Considering these, this study proposes both creation of a surgical navigation s ...Daha fazlası

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Experimental and mathematical modeling studies on thermoplastic composites filled with organic and inorganic residues Organik ve inorganik atık katkılı termoplastik kompozitler üzerine deneysel ve matematiksel modelleme araştırmaları

Küçükdoğan Öztürk, Nilay

ÖZETBu tez çalışmasında inorganik dolgu maddeleri (kırmızı çamur (Boksit cevheri atığı) ve kağıt hamur ve üretim çamuru endüstriyel atıkları veya bor bileşikleri) katkılanmış polimer kompozit üretimi yapılmıştır. Üretim işleminde dolgu oranları bir deneysel dizayn (D-optimal karışım ve tam bileşenli) sistematiği ile planlanmış ve üretimler termo-kinetik mikser ve çift vidalı ekstrüder ile gerçekleştirilmiştir. Kompozitlerin ve hammaddelerin karakterizasyonunda çeşitli test ve analiz cihazları kullanılmıştır. Kompozitlerin mekanik davranışlarının optimizasyonu amacıyla deneysel veriler ilk olar ...Daha fazlası

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Estimation of emotional situation using EEG signals and machine learning methods EEG sinyalleri ve makine öğrenme yöntemlerini kullanılarak duygusal durum kestirimi

Yeşilkaya, Bartu

ÖZETEmotion estimation is an effective analysis method used to increase the interaction between humans and machines. Electroencephalogram (EEG) based emotion prediction studies based on brain signals become very attractive since they provide successful results of emotion analysis. In this study, new methods for emotion prediction are presented in accordance with dimensional emotion modeling. Multichannel EEG signals are recorded while the subjects viewed pictures from the International Affective Image System (IAPS) data set. Signal preconditioning and artefact elimination was performed by appl ...Daha fazlası

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