Abstract The most simple and robust construction of the monolithic gear hobs present a common helical rake face for given line teeth, whose generatrix is straight-line segment perpendicular to hob’s axis while its directory helix, pitch helix. As consequence, constructive angles are zero on all edges. Total curvatures such surface negative. Thus, it can be grinded only using conical platter typ...

The aim of this study, is to use finite element simulation to achieve the optimal geometry of a broaching tool that creates the lowest tensile stress at the machined surface of the Ti6Al4V alloy. It plays a major role in reducing production costs and improves the surface integrity of the machined parts. The type and amount of residual stress determined by the thermal and mechanical loads transm...

The capacity of a cellular system is limited by two different phenomena, namely multipath fading and multiple access interference (MAI). A Two Dimensional (2-D) receiver combats both of these by processing the signal both in the spatial and temporal domain. An ideal 2-D receiver would perform joint space-time processing, but at the price of high computational complexity. In this dissertation we...

Micro texture tools (MTTs) with variable distribution density were proposed, and the novel MTTs can adapt to different friction states in tool chip contact area maintain good anti-friction wear resistance. The composed of two regions groove width which prepared on rake face by femtosecond laser technology. cutting processes carried out turning superalloy GH4202. According machining characterist...

In modern day society the increase of data generation and transfer has been an issue that researchers are working on. This generated and shared data might have a different purpose but one thing is certain, the reception. This communication can cover continents, countries, cities or even just a few meters. For the purpose of the later, personal area networks (PAN) have been created with a main f...

A new method to deal with multi path fading environment for DS–CDMA wireless networks has been proposed. Here, depending upon the statistical nature of the channel, signal is transmitted as a sum of various spreaded signals; each one delayed and scaled according to the delay & strengths of the multi paths of the transmitted channel. New method known as Pre-Raking is performed at the transmitted...

The Impulse Radio based Ultra Wideband (IR-UWB) system transmits data by sending pulses, each with very small time duration followed by pauses that are approximately two hundred times that length. Rake receiver improves system performance by equalizing signals from different paths. This enables the use of Rake receiver techniques in UWB systems. For high data rate ultra-wideband communication s...

using amplitude spectra and polarity (aspo) is a way for determining focal mechanisms of earthquakes. in the paper, the method has been used to determine the focal mechanism of zarand dahuiye earthquake dated 22 february 2005. the method uses frequency-wave number approach for calculating green functions and inverts full waveforms (from p arrival time up to the end of surface waves). at first s...

In this paper, a software wireless communication simulator performed which simulates a Code division Multiple Access (CDMA) as Wireless cellular telephony has been growing at a faster rate than wired-line telephone networks. This growth has also been fueled by the recent improvements in the capacity of wireless links due to the use of multiple access techniques (which allow many users to share ...