considerations on the explosion resistant design of special infrastructures have increased in the recent years. amongst the various types of infrastructures, road and railway tunnels have a unique importance due to their vital role in connection routes in emergency conditions. in this study, the explosion effects of a projectile impacting on a railway tunnel located in a jointed rock medium has...

the germination power of orchids (orchidaceae family) seems to betoo weak due lack of albumen. the study carried out with various treatments including pollination time and ga3 for breaking dormancy and increasing seed germination of orchids. the effect of pollination time (8 periods from january to august) and gibberellic acid (0, 500, 1000 and 1500 mg l-1) were studied on germination of phalae...

Various tools have been employed in studying and computing beam or field propagation in a medium with variation of small refractive index Feit and (Fleck,et al,1976)(Fleck,1978)( Ugwu et al,2007) some researchers had employed beam propagation method based on diagonalization of the Hermitian operator that generates the solution of the Helmholtz equation in media with real refractive indices (Thy...

This paper proposes an equivalent circuit model to obtain the transient electrical stress quantitatively in medium voltage frequency transformers modern power electronics. To verify this model, simulation is performed on a 1.5 kV/1 kHz transformer, revealing overshoot between turns and layers of transformer’s HV winding. Effects rise time input pulse voltage, stray capacitance winding insulatio...

background: acanthamoeba-related disease have a poor prognosis according to many previous studies. thus researches regarding biochemical and molecular aspects of this organism are a high priority. to this end achieving high amount of amoebae in culture is the first step for such studies. the main aim of the present research was to address the usage of tyi-s-33 (tripticase, yeast extract, iron-s...