On Öpik’s distance evaluation method in a cosmological context

Fractional Correlation Distance Method on Course Evaluation

Course evaluation is an important and necessary means to improve the level of course. A new course evaluation method based on fractional grey relational distance and analytic hierarchy process (AHP) is proposed in this paper. Firstly, the proportion of the different influence factors can be determined through constructing judging-matrix and calculating-back-to-one and dealing with the checkout ...

hazard evaluation of incinerators in mobin petrochemical company using hazop method

چکیده ندارد.

A Method for Defuzzication by Weighted Distance

Local Starbursts in a Cosmological Context

In this contribution I introduce some of the major issues that motivate the conference, with an emphasis on how starbursts fit into the “big picture”. I begin by defining starbursts in several different ways, and discuss the merits and limitations of these definitions. I will argue that the most physically useful definition of a starburst is its “intensity” (star formation rate per unit area). ...

The twin paradox in a cosmological context

Recently Abramowicz and Bajtlik (arXiv:0905.2428 (2009)) have studied the twin paradox in Schwarzschild spacetime. Considering circular motion they showed that the twin with a non-vanishing 4-acceleration is older than his brother at the reunion and argued that, in spaces that are asymptotically Minkowskian, there exists an absolute standard of rest determining which twin is the oldest at the r...