Vibration Analysis of Tool, Tool Holder and Spindle Interface

, M.Sc. Thesis Sharif University of Technology Rezai, Mohammad Mahdi (Author) ; Ahmadian, Mohammad Taghi (Supervisor) ; Movahhedy, Mohammad Reza (Supervisor)

Abstract

Investigation stability of chatter vibration is of great importance in machining processes. Finding frequency response function (FRF) at the tool tip is an effective method to predict stable machining regions. Commonly, the tool tip FRF is obtained using experimental modal analysis but this approach is often time consuming and requires expertise. In addition, changing tool or holder requires modal test which is a disadvantage, consequently modeling methods are of interest for researchers. Moreover, optimum design of machine tool is another benefit of modeling method. Also, in machining with flexible or micro tools in which experimental tests can not be performed, modeling methods would be...

Deconstruction of Media Hegemony Based on Ideas of Jacques Derrida

, M.Sc. Thesis Sharif University of Technology Honarvar, Mohammad Amin (Author) ; Hoseini, Hassan (Supervisor)

Abstract

In the first description if we describe technology as a tool, Communication technologies or media should be consider as the most important element of today's technological world. This research is going to cover reconsidering and recreating the mean of media based on the Ideas of JacquesDerrida. In this regard, two major dichotomy is evident in the public understanding of media. meanwhile "media versus message" and on the other hand opposition between "media and audience". So deconstruction in the face of these binary oppositions, want to read out the notion that message is superior to media, and on the other hand to deconstruction of the hegemony of the media on the audience

Heidegger on Science and Tool (Emphasized on "Being and Time")

, M.Sc. Thesis Sharif University of Technology Khalili, Mahdi (Author) ; Sefidkhosh, Meisam (Supervisor) ; Taghavi, Mostafa (Co-Advisor)

Abstract

This thesis is going to investigate the ontological foundation of Science and Tool. To this aim, it refers to Heidegger’s works especially the Being and time. Heidegger gets involve in analyzing Science in the Being and Time. He emphasizes on importance of establishment of a fundamental knowledge which should ontologically recognize basic concepts and methods of Sciences, to cause a real progress in sciences. Heidegger also asserts that the Mathematical interpretation of the world is not a fundamental, and it must be replaced with phenomenological interpretation, which clarifies the ontological foundation of the theoretical view, and regards to all aspects of world’s existence. In this...