Experimental investigation of flow characteristics and performance parameters of a podded aft engine air intake

This experimental study investigates the flow characteristics and performance parameters of a podded intake in aft-engine configuration at the aerodynamic interface plane (AIP), which is a typical configuration of a generic twin-engine regional jet aircraft. A scaled model aircraft with the port side hollow nacelle is equipped with total pressure rakes positioned exactly at the AIP to obtain the total pressure recovery and distortion. Multiple flight configurations (landing, take-off, and climb-out) with varying angle of attack (AoA) and side slip angle (SSA) are considered; attention has been paid to those with undesirable effects to the flow approaching the engine, by deploying flaps, slats, spoilers, and landing gear compartment. The mass flow rate and thus the mach number at the AIP is adjusted by changing the size of the exhaust nozzle. The Reynolds number dissimilarity is partially compensated by transition band application on the fuselage as well as engine inlet

Rural Settlements in Tunceli-Ovacık District

Kırsal yerleşimle ilgili olarak yöresel düzeyde yapılan bu araştırma, Tunceli-Ovacık yöresindeki mevcut kırsal yerleşimlerin fiziki planlamalarıyla ilgili özellikleri belirlemek, yöredeki yerleşim sorunlarını ortaya koymak ve bu sorunların çözümüne yönelik önerilerde bulunmak amacıyla yapılmıştır. Araştırmada incelenen kırsal yerleşimler dağ, orman ve ova köyleri şeklinde sınıflandırılmıştır. Araştırma bölgesinde dağ ve orman köyleri plansız dağınık yerleşim, ova köyleri ise plansız toplu yerleşim şeklindedir. Üç farklı yerleşim yerinden üçer köy tespit edilerek, bu köylerden üçer işletme olmak üzere toplam 27 işletme üzerinde araştırma yürütülmüştür. Araştırma sonucunda yerleşim yerlerinde önemli kırsal altyapı sorunları tespitIn this study is aimed determining of characteristics and problems about physical planning of the rural settlements in Tunceli-Ovacık district and suggestions for solution of these problems. Investigated villages in this study are classified as mountain, forest and lowland. The mountain and forest villages are unplanned dispersed settlements and lowland villages are unplanned collected settlements. Three villages were determined in the three different settlements and three farms were selected in every village. The total 27 farms were investigated. As a result of this study, the substructures problems of the settlements were determined social service buildings as school, village clinic in the settlements didn?t exist

MIMO Sistemlerde Alamouti Uzay Zaman Blok Kodlamanın Weibull Sönümleme Kanalı Üzerindeki Performans Analizi

Kablosuz haberleşme sistemlerinin performansı kanal sönümlemelerinden etkilenmektedir. Yeni nesil kablosuz sistemlerin gelişimiyle beraber güvenilir bağlantı ihtiyaçları da artmaktadır. Kablosuz iletişimdeki en büyük zorluk, sönümlemelerden en az etkilenen kesintisiz iletişimin gerçekleştirilmesidir. Çeşitleme teknikleri ile çoklu anten teknolojileri bu noktada yardımcı olmaktadır. Bu çalışmada, alıcı ve vericide kullanılan Çoklu Giriş Çoklu Çıkış (MIMO) anten yapısı, hem iç hem de dış ortamdaki radyo yayılım ortamını modelleyen Weibull sönümleme kanalı ve İkili Faz Kaydırmalı Anahtarlama (BPSK) modülasyonu altında vericide çeşitleme tekniklerinden olan Alamouti Uzay Zaman Blok Kodlamanın (STBC) performansı analiz edilmiştir. Weibull sönümleme kanalında çoklu anten ve STBC kullanılmasının, Bit Hata Oranını (BER) azalttığı ve sistem performansını arttırdığı gözlemlenmiştir

The Association Between Irritable Bowel Syndrome and Lactose Intolerance

Aim:Irritable bowel syndrome (IBS) and lactose intolerance (LI) may co-exist and readily cause diagnostic confusion due to similar symptomatology. This study aims to examine the frequency of LI in healthy controls and in participants diagnosed with IBS based on Roma III criteria, as an effort to investigate the association between IBS and LI.Materials and Methods:The patient population consisted of individuals between 18 and 80 years of age who attended between June-December 2013. Patients diagnosed with IBS based on Roma III criteria comprised the IBS group, and subtypes of IBS. Control group was healthy volunteers over 18 years of age with no IBS-like symptoms. All participants ingested 25 g of lactose dissolved in 250 ml of water within 5 minutes after 8 hours of fasting, in order to evaluate the LI via hydrogen breath test (0, 15, 30, 60, 90, and 120 minutes).Results:Of the total 200 participants, 100 (50%) were in the IBS group and 100 (50.0%) were in the control group. Of the total 70 patients (35.0%) with LI, 47 (47.0%) were in the IBS group and 23 (23.0%) were in the control group (p=0.001). Symptoms related to IBS were more common in participants with LI in both groups (p=0.001, p=0.001 respectively).Conclusion:A significantly increased frequency of LI was found among IBS patients than in controls. In addition, symptoms associated with lactose intake occurred at a higher frequency in IBS patient, although the difference was insignificant