Recently many research studies have revealed the increasing importance of natural fiber in modern applications. Natural fibers are used these days in many important sectors like medical, aerospace, agriculture, and so forth. The cause of increasing the application of natural fiber in different fields is its ecofriendly behavior and excellent mechanical properties. In the research work, date palm, a natural fiber, is used to replace asbestos and Kevlar, which are very harmful to the human body. There are very few papers on comparative study of natural fiber-based composites to actual brake friction material. In this study, new brake pad composites of date palm fiber are developed and compared with Kevlar-based brake pad composites. The different percentages (5%-20%) of date palm fiber and Kevlar (5-10) were used to compare the study.The date palm fiber composites have given maximum better results on 5% composition for the mechanical, tribological, physical, and chemical proprieties.
As the network nowadays is overcrowded, due to increase in demand of wireless applications requiring high data rates with full signal strength still there are parts in our overall wireless spectrum that are unutilized. Cognitive radio networks technology is a one step ahead in solving the problem of underutilization of certain parts of spectrum. Interference plays a negative role in the success of cognitive radio networks technology. Interference temperature gives the closest approximation of overall interference at a particular time and position. The proposed approach implements a feedback system in cognitive radio networks using interference temperature and achievable capacity as a constraint using back propagation neural network. The goal is to maximize data rate at a particular time at designated channel, and channel utilization is maximized.
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