Testing the empirical shock arrival model using quadrature observations

the use of appropriate madm model for ranking the vendors of mci equipments using fuzzy approach

abstract nowadays, the science of decision making has been paid to more attention due to the complexity of the problems of suppliers selection. as known, one of the efficient tools in economic and human resources development is the extension of communication networks in developing countries. so, the proper selection of suppliers of tc equipments is of concern very much. in this study, a ...

A Semi-empirical Model to Predict the Attached Axisymmetric Shock Shape

In this work, a simple semi-empirical model is proposed, based on Response Surface Model, RSM, to determine the shape of an attached oblique shock wave emanating from a pointed axisymmetric nose at zero angle of attack. Extensive supersonic visualization images have been compiled from various nose shapes at different Mach numbers, along with some others performed by the author for the present p...

the effect of using model essays on the develpment of writing proficiency of iranina pre-intermediate efl learners

abstract the present study was conducted to investigate the effect of using model essays on the development of writing proficiency of iranian pre-intermediate efl learners. to fulfill the purpose of the study, 55 pre- intermediate learners of parsa language institute were chosen by means of administering proficiency test. based on the results of the pretest, two matched groups, one as the expe...

Empirical Testing of the Malthusian Population Model

The empirical Earth rotation model from VLBI observations

Aims. An alternative to the traditional method for modeling kinematics of the Earth’s rotation is proposed. The purpose of developing the new approach is to provide a self-consistent and simple description of the Earth’s rotation in a way that can be directly estimated from observations without using intermediate quantities. Methods. Instead of estimating time series of pole coordinates, differ...