Sleep as restitution: an introduction

Museum as Text An Introduction to the Relationship between Semiotics and the Museum as an Institution

The Reading of Museum is the title of a book by Reza Dabirinezhad that has just been published and is available to the Iranian academic and cultural community. The author is a museum specialist and one of the renowned executives of the country's museums, who uses the methodology of semiotics to analyze the mechanism of the interpretation of museum objects and the Semantic System in museums. Sin...

An Introduction to Sociolinguistics

Introduction to Sleep Electroencephalography

EEG records synaptic potentials from pyramidal cells. It is critical to remember that there is no absolute voltage measurement in clinical EEG. Rather, an EEG trace records potential differences between two electrodes. By convention of the amplifiers used in clinical EEG, an upgoing deflection indicates that input 1 (grid 1) is more negative (or less positive) than input 2 (grid 2). This is an ...

Environmental epidemiology: An introduction

Orbifolds as Groupoids: an Introduction

The purpose of this paper is to describe orbifolds in terms of (a certain kind of) groupoids. In doing so, I hope to convince you that the theory of (Lie) groupoids provides a most convenient language for developing the foundations of the theory of orbifolds. Indeed, rather than defining all kinds of structures and invariants in a seemingly ad hoc way, often in terms of local charts, one can us...