Exhaust thermal energy recuperation in small gas turbine and turbojet engines Küçük gaz türbini ve turbojet motorlarında egzoz termal enerji geri kazanımı

Hakyemez Çatiner, Deniz

ÖZETHer geçen gün artan hava kirliliği ile önem kazanan karbondioksit emisyonunun azaltılmasına yönelik çalışmalar her alanda devam etmektedir. Elektrik üretimi, taşımacılık gibi hava kirliliğinin büyük kısmını oluşturan alanlarda gaz türbini kullanımı yaygındır. Gelişime açık bu motorlar ile verimi arttırmak ve yakıt tasarrufu sağlamak amacıyla çalışılan yöntemlerden biri olan reküperatör tasarımı bu tezin konusudur. Yer ve hava olmak üzere iki farklı mikro gas türbin motoru için borulu ısı değiştirici basınç kaybı ve sıcaklık artışı dikkate alınarak modellenmiştir. Hava tipi motorlarda alan ...Daha fazlası

Measurements from conventional, digital and CT-derived cephalograms: a comparative study

ASLI BAYSAL

Objective: The purpose of this retrospective radiographic study was to determine the reliability and reproducibility of skeletal and dental measurements of lateral cephalograms created from a computerised tomography (CT) scan compared with conventional and digital lateral cephalograms. Methods: CT and conventional lateral cephalograms of the same patients were obtained from university archives. The lateral cephalometric radiographs of 30 patients were manually traced. The radiographs were subsequently scanned and traced using Dolphin Imaging software version 11 (Dolphin Imaging, Chatswort ...Daha fazlası

Do enamel microabrasion and casein phosphopeptide-amorphous calcium phosphate affect shear bond strength of orthodontic brackets bonded to a demineralized enamel surface?

ASLI BAYSAL |

Objective: To evaluate and compare the effects of enamel microabrasion, casein phosphopeptide-amorphous calcium phosphate (CPP-ACP), and their combination on the shear bond strength (SBS) of orthodontic brackets bonded to demineralized enamel surface. Materials and Methods: One hundred human first premolar teeth were randomly allocated to one of five groups. Group I was considered as the control of other groups. For the remaining groups, demineralization was performed via solutions. In group II, brackets were directly bonded to the demineralized enamel surface. CPP-ACP was applied in group ...Daha fazlası

Dentoskeletal effects of Twin Block and Herbst appliances in patients with Class II division 1 mandibular retrognathy

ASLI BAYSAL

OBJECTIVE: The aim of this study is to evaluate dentoskeletal effects of Herbst and Twin Block (TB) appliance therapies in Skeletal Class II malocclusion. SUBJECTS AND METHODS: Herbst group consisted of 11 girls and 9 boys (mean age = 12.74±1.43 years), TB group comprised of 10 girls and 10 boys (mean age = 13.0±1.32 years), and control group included 9 girls and 11 boys (mean age = 12.17±1.47 years). Mean treatment/observation times were 15.81±5.96 months for Herbst, 16.20±7.54 months for TB, and 15.58±3.13 months for control group. Pre-treatment (T0) and post-treatment (T1) lateral cephal ...Daha fazlası

Relationship between odontogenic bacteremia and orthodontic stripping

TANCAN UYSAL

Introduction: The aim of this study was to evaluate the prevalence of bacteremia associated with an orthodontic stripping procedure. Methods: The study included 29 orthodontic patients (mean age, 18.2 6 3.4 years). We used a standardized stripping procedure: a perforated stripping disk with a contra-angle hand piece was used at a low speed (\15,000 rpm; 10 seconds) on the mandibular anterior teeth. Blood samples were collected by inserting a cannula into the left antecubital fossa. A baseline sample was taken before treatment, and a second sample was taken after the stripping procedure. T ...Daha fazlası

Evaluation of Changes in Dietary Habits of Healthcare Professionals during COVID-19

GÜLŞAH KANER TOHTAK | GAMZE ÇALIK | GAMZE YURTDAŞ DEPBOYLU

Objective: The workload and working hours of healthcare professionals have increased due to the COVID-19 pandemic. The aim of this study was to evaluate how COVID-19 outbreak restrictions affect dietary habits among healthcare professionals. Material and Method: The study population was 239 adults aged between 18-65 years. An online survey including questions about demographic variables, health information, lifestyle behaviors, and dietary habits were sent via an online platform. Self-reported weight, and height before and during the pandemic were also collected. Results: The percentage of tho ...Daha fazlası

Turkish Character Usage in Text Classification

Ali Aycan KOLUKISA

Abstract This study is prepared to examine the effects of Turkish character usage on text data by using multiple classifiers. Regression Classifiers, SVM, NB-Classifiers, and ANN are frequently used in supervised learning methods, especially in classification problems. Regression classifiers generally come in two types: as Linear and Logistic. There are also more than one type of Naive Bayes classifier. In our study, after mentioning the properties of Linear Regression and Logistic Regression classifiers in general terms, why Logistic Regression is much more suitable for this study is explaine ...Daha fazlası

Comparison of Adverse Effects of BioNTech mRNA and Sinovac Vaccines in Adults in Turkey

SEVİL YILMAZ | PERİHAN ÇETİN

Objective: The aim of this study is to compare the side effects of Pfizer-BioNTech mRNA and Sinovac-CoronaVac vaccines administered in adults in Turkey. Material and Method: This is a cross-sectional study. The study sample consisted of 187 adults, 95 in the Pfizer-BioNTech group and 92 in the Sinovac-CoronaVac group, who came for vaccination. A Visual Analogue Scale (VAS) and a questionnaire were applied to vaccinated individuals in a hospital. They were asked about any adverse effects at 6, 12 and 24 hours post-vaccination. Results: The most common local adverse effect was pain at the inject ...Daha fazlası

Abstract Book of 3. International Conference on Medical Devices (ICMD’2020)

3rd International Conference on Medical Devices, ICMD’2020, is organized by Alanya Alaaddin Keykubat University (ALKU), Akdeniz University (Akdeniz U.), and Izmir Katip Celebi University (IKCU) with international participation on September 28-29, 2020. All presentations were online because of the pandemic. ICMD conferences (where former abbreviation was TIPCIH) bring together the students, users, manufacturers, researchers, and public representatives working in the field of medical device technologies. It also aims to share the information investigated from scientific researchs on the medical ...Daha fazlası

Evaluation of Polymeric Composite Material Alternatives for Metal Fulcrum Ring Part Used in Dry Friction Clutches

Ibrahim Can KAYMAZ

As same as in other industries, the automotive industry is one of the industries that expects continuous improvements. In this context, it is very important to integrate new technologies into the industry and to use new, alternative materials for industrial products. With the increase of these studies, cost and weight reduction are improved while serious advantages are obtained by maintaining the product's performance. The suitability of production with additive manufacturing of the fulcrum ring, which is a sub-component of the clutch cover assembly in the dry friction clutch system, acts as a ...Daha fazlası

Investigation of time-dependent behavior of a high-rise reinforced concrete building Betonarme yüksek bir binanın zamana bağlı davranışının incelenmesi

Zamani, Amanullah

Özet:Sünme ve büzülme gibi zamana bağlı deformasyonlardan dolayı yüksek katlı binaların düşey elemanlarında eksenel kısalmalar meydana gelmektedir. Düşey elemanların eksenel kısalmaları yapısal ve yapısal olmayan elemanlarda beklenmedik hasarlara neden olabildiğinden yapı mühendislerinin araştırması gereken bir konu olmuştur. Eksenel kısalmaların miktarını belirlemek için çeşitli hesap yöntemleri mevcuttur. Binaların statik hesaplarında, geleneksel bir yaklaşım olarak, bina inşaatının tamamlanmasından sonra dış yüklerin yapıya doğrudan ve tek bir adımda uygulandığı varsayılarak yapılar modelle ...Daha fazlası

Surface Roughness Performance Related to the Direction in Composite Structures Produced by the Fused Filament Fabrication Method and Improve to Surface Roughness

Özlem DOĞRU

Additive manufacturing is used today in different industries to produce prototypes and even final products. Additive manufacturing offers solutions for the fabrication of complex geometries and is preferred for manufacturing parts in a wide variety of applications. The fused filament fabrication (FFF) method is the additive manufacturing method with the most users worldwide. With the developing material science, it has been possible to produce composite structures and even metal products by going beyond the production of pure polymers in the FFF method. The mechanical properties of the materia ...Daha fazlası