EXPERIMENTAL ANALYSIS OF THE EFFECTS OF ENVIRONMENTAL CONDITIONS ON THE V-BELT SLIP

In the performance of force-coupled V-belt pulley mechanisms, friction forces play quite important role. Surface friction coefficient affecting friction force changes as a function of the environmental conditions prevailing around the system. Because of this feature, efficiency of the mechanism depends on the environmental conditions in the working space. In this study, experiments have been conducted in various moisture and temperature conditions and at the condition presence of various material particles and dust such as chalk, cement, sand, synthetic fiber and flour. Thus, slipping of pulleys relative to each other as a function of environmental conditions have been determined. Slipping values have been shown graphically. It was seen that relative moisture of the air slightly affects total slippage and as relative moisture of the air was kept constant, slipping values increased exponentially with temperature. On the other hand, at the condition including various material particles and dust the slippage was affected by particles and dust depending on their feature and structure

Bilgi ve Internet Firmalarında Fiyat Dağılımı

Internet firms charge a wide range of prices for nearly homogeneous products and price dispersion vary significantly across markets. This study is an attempt to explain different levels of price dispersion across online product markets. We found price dispersion vary systematically with the number of firms offering the product and the markets at which consumers are more informed have smaller price dispersion. Moreover prices charged by individual retailers decline as the number of retailers selling the same product rise.İnternetteki alısveris firmaları benzer veya aynı ürünler için birbirinden oldukça farklı fiyatlarda satıs yapabilmektedir. Fiyat farklılıkları sektörlere gore önemli oranda farklılık göstermektedir. Bu çalısma sektörlere gore önemli ölçüde değisiklik gösteren fiyat farklılıklarını açıklamayı amaçlamaktadır. Çalısma sonunda fiyat farklılıklarının aynı ürünü satan firma sayısı azaldıkça arttığı ve tüketici bilinç ve bilgi seviyesi yükseldikçe azaldığı sonucuna ulasıldı. Ayrıca aynı ürünü satan firma sayısı arttıkça ürünün ortalama fiyatının azaldığı bulundu.Publisher's Versio