Investigation of Manufacturing and Characterization of Radar Absorbing Hybrid Structures

Mohamed Yousef Ali Issa

Significant development of radar systems after World War II has led to studying the interaction between electromagnetic waves at radar frequencies and different materials. One perspective of these studies is to ascertain ways of decreasing reflected waves. However, the applications have not been limited only to defense applications but also to different fields where human beings are exposed to electromagnetic waves to avoid potential health effects due to exposure to electromagnetic waves. Since the discovery of radar systems, many studies have focused on electromagnetic radiation and absorbin ...Daha fazlası

Experimental investigation of Newtonian and non-Newtonian fluid flows in rough pipes and modeling using computational fluid dynamics Newtonyen ve Newtonyen olmayan akışkanın pürüzlü borudaki akışının deneysel olarak incelenmesi ve hesaplamalı akışkanlar dinamiği kullanılarak modellenmesi

Müftüoğlu, Tevfik Denizhan

ÖZETBoru akışlarındaki basınç kayıpların tahmini, mühendislik uygulamalarında büyük önem taşımaktadır. Akışkanların verimli bir şekilde taşınımı için pompalama gereksinimlerinin belirlenmesi ve doğru pompa sistemlerinin seçimi basınç kaybının hassas bir şekilde tahminine dayalıdır. Bu çalışmada, Newtonyen ve Newtonyen olmayan akışkanların pürüzlü galvanizli borulardaki akışları üç farklı akışkanla (su ve bunun yanında farklı kontranstrasyon ve viskoz karakteristiğine sahip iki polimerik solüsyon), çeşitli debiler ve akışkan sıcaklık koşulları için, farklı çaplara sahip galvanizli borularda den ...Daha fazlası

The use of integrated approach for urban tourism development in İzmir İzmir’de kent turizminin gelişmesi için bütüncül yaklaşımın kullanılması

Selçuk, Çağlar

ABSTRACTProgram The multifaceted and rapidly changing structure of the tourism industry has recently gained a different dimension with the contributions of technological developments. The concept of urban tourism, which is accepted as one of the oldest types of tourism, still constitutes an important part of today's tourist travels. As a tourist destination, cities have a much more diverse and accessible touristic resource than other alternative destinations. The interest in cities has ascended day by day thanks to this collective structure, and tourism professionals and local administrations ...Daha fazlası

Mongolia: social and economic issues

Along with the interest in general Turkish history, the interest in the history, language and culture of the Mongols has also increased; researchers who prefer this field as a field of specialization have increased. Especially in recent years, Turkish and Mongolian academics have carried out joint studies, workshops and conferences in the field of history, language and culture, and shared them with the scientific world. This historical interest in the Mongols and the geography of Mongolia has also triggered the interest in the contemporary life, social and economic situation of Mongolia. Izmir ...Daha fazlası

Combining ahp and gis methods in site selection for sustainable urban regeneration planning model Case study of Karşıyaka, İzmir, Turkey Sürdürülebilir kentsel dönüşüm plan modeli için alan seçiminde AHS ve GIS yöntemlerinin kombinasyonu İzmir Karşıyaka örneği

Gönüllü Sütçüoğlu, Gökçe

ÖzetÜlkemizde 1990'lı yıllarda başlamış olan kentsel dönüşüm uygulamaları günümüzde artan bir hızla devam etmektedir. Ancak afet alanları dışında yürütülen kentsel dönüşüm çalışmalarında herhangi bir yer seçim çalışması yapılmamaktadır. Kent parçaları farklı sorunlara sahipken kentin hangi parçasında hangi sorun ya da sorunların bulunduğunun mekânsal olarak ortaya konulması, bu sorunların önceliklendirilmesi, öncelikli kentsel dönüşüm gerektiren alanların belirlenmesi ve bu alanların hangi sıra ile ve hangi müdahale yöntemi ile ele alınması gerektiğinin ortaya konulması, kentsel dönüşüm uygula ...Daha fazlası

A Novel, Nelder-Mead Optimization Approach, based on Neuro-regression modeling for the Energy Efficiency Parameters of End Milling Process

ŞEYDA İŞBİLİR

Global crises are increasing day by day due to the rapid depletion of energy supplies around the planet. One of the goals of engineering is to prevent this situation by developing innovative solutions to this rapid energy consumption that has disappeared in the world. A solution could be to reduce the energy consumption of the machines that are used during production. In this study, a new design technique based on the neuro-regression approach and non-linear regression modeling was offered as an alternative to Taguchi design to reduce energy consumption. Thus, a cutting parameter optimization ...Daha fazlası

Enhancement of the electrical properties of graphene for electronic devices

Ersu, Gülsüm

Graphene, a one-atom-thick two-dimensional material, has drawn great interest for many electronic and optoelectronic applications due to its extraordinary properties. The properties of the graphene can be modified with different chemical methods and introduced new properties, which widens its potential for applications. The non-covalent modification of graphene is one of the basic techniques for modifying the electrical properties of graphene without disrupting the structure. In this thesis, the high-quality graphene has been synthesized and electrical properties of graphene have been tuned b ...Daha fazlası

Synthesis and application of the iridium semiconductor complexes for organic light emitting diodes

Organic light emitting diodes (OLEDs) is a multi-disciplinary research area. Due to the possibility of being produced in different designs and low costs, studies on the research and development of energy efficient structures have increased. These expectations have increased so much that research on new types of molecules and device designs is increasing with the expectation that OLEDs will be more efficient than all available light sources and that almost 100% of the energy used can be converted to light. Transition metal complexes, especially Iridium(III) complexes, which make them phosphores ...Daha fazlası

Nanocomposites with graphene

The carbon fiber used in the manufacturing of advanced composites has various applications in the automotive, aerospace, and electronics industry because of their comprehensive properties such as lightweight, flexibility, high strength to weight ratio, excellent chemical resistance, superior electrical conductivity and thermal conductivity. Different kinds of carbon fiber precursors have been used and polyacrylonitrile (PAN) is the mostly utilized polymer type which is a petroleum-based, expensive and unsustainable. Remarkably, lignin is a highly accessible, low-cost, and renewable resource. ...Daha fazlası

Design and development of a collimator mechanism that will be utilized in radiation therapy

Yazıcı, Mustafa Volkan

This thesis focuses on a Multileaf Collimator design that can shape the beam contour to fit the shape of target geometry and its design improvements. Main purpose of this design is lowering the number of leaves on the multileaf collimator and making the system easier to be controlled. As the Collimator devices undertake the most important point of the beam shaping procedure, ease of control and precision of collimator devices are the major points of operation. As the radiation therapy is one of the most complex and vital medical operations, this thesis started with the deep literature survey ...Daha fazlası

Smart business accounting software as an android mobile application using artificial imtelligence

Okyay, Muhammet Serhat

In this study, the necessary data obtained from the databases (such as MSSQL, Mysql, Postgre SQL, etc.) of the softwares like ETA and NETSİS that are used for preaccountancy of the local and global companies were read, some of the data were written to the databases, and this data was used by the end user by using mobile phones or tablets carrying Android operating systems and working with Internet and cloud technology. In addition, new data sets that are collected on a cloud system from the accounting data while the company is on was studied by genetic algorithms which are one of the artificia ...Daha fazlası

Effects of beta -tricalcium phosphate concentration on osteogenic differentiation of human mesenchymal stem cells in chitosan based composite scaffolds

Demirci, Emine Afra

Today, tissue transplant applications are widely used for repair of damaged hard tissue. Despite the gold standard of autografts, interest in synthetic bone grafts produced by tissue engineering techniques is increasing day by day, due to limiting factors such as damage to the tissue site and limited graft availability in allografts, and the risk of developing an immune system response in allografts.Many bioceramic materials, including β-tricalcium phosphate (β-TCP), hydroxyapatite (HA) and calcium sulfate, are widely used in bone tissue engineering. β-TCP has been the most preferred biocerami ...Daha fazlası