Performance Evaluation of an Experimental Turbojet Engine

An exergy analysis is presented including design parameters and performance assessment, by identifying the losses and efficiency of a gas turbine engine. The aim of this paper is to determine the performance of a small turbojet engine with an exergetic analysis based on test data. Experimental data from testing was collected at full-load of small turbojet engine. The turbojet engine exhaust data contains CO 2 , CO, CH 4 , H 2 , H 2 O, NO, NO 2 , N 2 and O 2 with a relative humidity of 35 % for the ambient air of the performed experiments. The evaluated main components of the turbojet engine are the air compressor, the combustion chamber and the gas turbine. As a result of the thermodynamic analysis, exergy efficiencies (based on product/fuel) of the air compressor, the combustion chamber and the gas turbine are 81.57 %, 50.13 % and 97.81 %, respectively. A major proportion of the total exergy destruction was found for the combustion chamber at 167.33 kW. The exergy destruction rates are 8.20 %, 90.70 % and 1.08 % in the compressor, the combustion chamber and the gas turbine, respectively. The rates of exergy destruction within the system components are compared on the basis of the exergy rate of the fuel provided to the engine. Eventually, the exergy rate of the fuel is calculated to be 4.50 % of unusable due to exergy destruction within the compressor, 49.76 % unusable due to exergy destruction within the combustion chamber and 0.59 % unusable due to exergy destruction within the gas turbine. It can be stated that approximately 55 % of the exergy rate of the fuel provided to the engine can not be used by the engine.

Verstehen lernen: Islamische und evangelische Religionspädagogik im Dialog

Ausgehend von islamisch-theologischen Grundsatzfragen werden Möglichkeiten und Grenzen eines islamischen Religionsunterrichts im österreichischen Kontext erforscht. Begleitet wird diese Forschung in evangelischer Perspektive. Der Beitrag gibt Einblicke in den jeweiligen Forschungsstand.

Quantifying Mesoscale Neuroanatomy Using X-Ray Microtomography

Methods for resolving the three-dimensional (3D) microstructure of the brain typically start by thinly slicing and staining the brain, followed by imaging numerous individual sections with visible light photons or electrons. In contrast, X-rays can be used to image thick samples, providing a rapid approach for producing large 3D brain maps without sectioning. Here we demonstrate the use of synchrotron X-ray microtomography (µCT) for producing mesoscale (∼1 µm 3 resolution) brain maps from millimeter-scale volumes of mouse brain. We introduce a pipeline for µCT-based brain mapping that develops and integrates methods for sample preparation, imaging, and automated segmentation of cells, blood vessels, and myelinated axons, in addition to statistical analyses of these brain structures. Our results demonstrate that X-ray tomography achieves rapid quantification of large brain volumes, complementing other brain mapping and connectomics efforts.

GIDALARDA HİLE AMACIYLA KULLANILAN BAZI BİTKİ KAYNAKLI BİLEŞENLERİN GERÇEK ZAMANLI PZR İLE TESPİTİ

BORSA İSTANBUL'DAKİ TÜRK FUTBOL KULÜPLERİ WEB SİTELERİNİN İNGİLTERE'DEKİ RAKİPLERİYLE YATIRIMCI İLİŞKİLERİ AÇISINDAN ANALİZİ

Since the 1980s, the development of financial liberalization and information technologies has increased the awareness of stakeholders of companies and has enabled investor relations to reach professional dimensions. In this study, it is aimed to contribute to the development of the management of the investor relations of football clubs and to the correct pricing of market values in Stock Exchange Istanbul. For this reason, information will be given about the areas that football clubs which are public offering in Borsa Istanbul and developed markets, distinguish between their web sites and their investor relations in their web sites. When the said websites are examined, the score cards prepared by the Association of Turkish Investor will be used for club activity reports, financial results explanations and website evaluations.

Köpek mamalarında kullanılan tahıllarda ısıl işlemin nişastanın jelatinize olması ve sindirilebilirliği üzerine etkisi

The Effects of Smart Board Applications on Students’ Attitudes in Pattern-Making Teaching

The aim of this study is to determine the effects of Synchronous E-learning Applications and Face-to-face Teaching based on Smart Board on students' attitudes in Pattern-Making Teaching which is one of the fundamental courses in fashion design and clothing education. Hence, this paper seeks to answer the question “Do Synchronous E-learning Applications and Face-to-face Teaching based on Smart Board affect students' attitudes in Pattern-Making Teaching?” In this study, a pretest posttest control group design was used on 51 students. An attitude scale developed by the researchers was applied. In Pattern-Making teaching, the first Experiment group was taught through Face-to-face Teaching based on Smart Board, while the second Experiment group was taught through Synchronous E-learning based on Smart Board. The Control group was taught through Traditional Teaching methods. The Kruskal Wallis-H Test was applied to identify the difference between the groups. The Mann Whitney-U Test was performed for binary comparisons to test for significant differences according to test results. A significant correlation was found at 0.001 level in the results. Smart Board applications were observed to generate more positive attitudes in the experiment groups. It was found that the attitudes of the students in the Experiment-1 group where the smart board based Face-toface Teaching was conducted were more positive than those in the Experiment-2 group in which E-learning ∗ Corresponding author. Tel.: +90 332 223 1783; fax: +90 332 241 2862. E-mail address: [email protected] eISSN: 2301-2218 Selection & Peer-review under responsibility of the Editors 2406 Applications were conducted. As expected, no significant difference in attitudes of students were found in the Control group since the same teaching approach was used. © 2017 Published by Future Academy www.FutureAcademy.org.uk

Serum Sickness-Like reaction developed due to Bupropion Hcl during smoking cessation therapy: Case Report

Management of an acute ischemic stroke during thrombolytic treatment in a pregnant patient with prosthetic valve thrombosis

Prosthetic valve thrombosis (PVT) is a life-threatening complication in pregnant women with mechanical prosthetic heart valves. Thrombolytic therapy (TT) has evolved as an effective treatment alternative to surgery, which is associated with very high maternal and fetal mortality and morbidity in these patients. Acute ischemic stroke may rarely occur during TT for PVT. Here, we present a pregnant patient who was complicated with cerebral thromboembolism during TT for PVT and successfully managed with continuation of TT.

Effect of nitrogen gas flushing treatments on total antioxidant capacity and ascorbic acid content in raw bovine milk during cold storage

Continuous nitrogen gas (N2) flushing extends the shelf life of raw milk (RM) during cold storage. The effect of N2 treatment on the total antioxidant capacity (TAC) and ascorbic acid (AA) content of RM was determined during cold storage. TAC of RM or deproteinized RM was determined by ABTS and DPPH methods, while L(+)-AA content of RM was determined chromatographically on days 0, 4 and 7 during storage at 6±1 °C. With the ABTS method, the TAC of RM decreased from 472.33±16.70 to 369.47±62.06 μM TEAC while it reduced from 13.30±0.84 to 8.20±0.66 μM TEAC with DPPH method during cold storage. TAC of RM determined with ABTS method decreased after 4 day-storage; however, they remained statistically similar for N2-treated samples during 7 day-storage. The AA content of RM ranged from 14.06 to 10.76 mg/L during storage but N2-treatment did not influence AA content significantly. Deproteinization reduced TAC values of milk samples significantly, and the reduction with the ABTS method was about 47.50 % for control samples cold-stored for four days, while it was 11.67 % for N2-treated deproteinized RM. In conclusion, N2-flushing through the headspace of milk containing vessels showed a significant protective effect on the antioxidant components of RM during cold storage.