Slab track is one of the technical possibilities to achieve the following goals: increase the conductivity of a railway, increase the highest permitted train speed, reduce the cost of railway maintenance, and increase the railway lifetime. However, the abundance of slab road constructions that occurred during the development stages presents a challenge to railway operators, designers and researchers, about the selection of a right slab track and establishing requirements to it. The present article analyses the ballastless track constructions that are used in the European Union and other world countries. The market is analysed, and a comparative evaluation of the ballastless track construction is carried out, based on the quality and price, by rating and providing the evaluation of usability and recommendations.

Slab track is one of the technical possibilities to achieve the following goals: increase the conductivity of a railway, increase the highest permitted train speed, reduce the cost of railway maintenance, and increase the railway lifetime. However, the abundance of slab road constructions that occurred during the development stages presents a challenge to railway operators, designers and researchers, about the selection of a right slab track and establishing requirements to it. The present article analyses the ballastless track constructions that are used in the European Union and other world countries. The market is analysed, and a comparative evaluation of the ballastless track construction is carried out, based on the quality and price, by rating and providing the evaluation of usability and recommendations.

The installation of a heat storage tank is a very costeffective way to improve the performance and flexibility of a CHP plant. Such a heat storage tank usually accumulates heat by thermal stratification. This phenomenon is caused by the thermal buoyancy because of the difference in temperature between cold and hot water. The heat storage tank may have three operating modes, i. e. charge, discharge and storage in a CHP plant. When CHP units, which charge the heat storage tank, operate at full load, usually only two operation modes occur in the tank, i.e. charge and discharge.

DERSİN ÖĞRETİM ÜYESİ YRD.DOÇ.DR. RECAİ FATİH TUNAY DENEYİ YAPTIRAN ÖĞRETİM ELEMANI YRD.DOÇ.DR. RECAİ FATİH TUNAY DENEY GRUBU: DENEY TARİHİ : TESLİM TARİHİ : 2 DENEYİN ADI: Radyal Kaymalı Yataklarda Sürtünme Kuvvetinin Ölçülmesi DENEYİN AMACI: Radyal kaymalı yataklarda çalışma esnasında meydana gelen sürtünme kuvveti ve sürtünme katsayısına, test yağlarının farklı mil hızlarının, farklı yük büyüklüklerinin etkisinin belirlenmesi. TEORİK BİLGİ: Kayma işlemi sırasında üretilmiş olan ısı ve artık parçaları çalışma ortamından uzaklaştırmak, kayma yüzeylerindeki sürtünme ve aşınmayı azaltmak için iki katı kayma yüzeyi arasında sıvı, katı veya gaz yağlama maddelerinin ilavesiyle yapılan işleme yağlama adı verilmektedir. Bu sistemi inceleyen bilim ve teknoloji dalına Triboloji denilmektedir. Yağlama prosesleri; cisimlerin temas geometrisi, kayma yüzeylerinin hızı, çevre şartları, kullanılan yağlayıcının fiziksel ve kimyasal özellikleri, malzemenin yapısı, yüzeye yakın tabakanın özelliği gibi birçok faktöre bağlı olabilmektedir.