نتایج جستجو برای: track structure
تعداد نتایج: 1623444 فیلتر نتایج به سال:
in this thesis, structural, electronical, and optical properties of inverse pervskite(ca3pbo) in cubic phase have been investigated.the calculation have been done based on density functional theory and according to generalized gradiant approximate (gga) as correlating potential. in order to calculate the configurations, implementing in the wien2k code have been used from 2013 version. first of ...
this paper deals with the threshold radius that warrants the use of single restraining rail for transit and railroads. different railways use different threshold radius from 91m to 365m to provide restraining rail. these threshold figures are probably experience driven choices. the need for restraining rail may be related to a so-called derailment alarm coefficient of 1.2 sustained over 2m leng...
Introduction Single event effects (SEE’s) induced by heavy-ions from cosmic-rays are a major problem for the reliability of microelectronic devices in space environment. The energy deposited by a heavy-ion through the sensitive structure of a device produces, in a very short time, a dense concentration of electron-hole pairs along the ion trajectory. Generated carriers are collected by drift (i...
One of the most important challenges in the development of urban railways network is the effects of railway vibrations on human and adjacent structures. Although various investigations into the sources of railway vibrations have been conducted, very few research works have been reported on the influences of track geometry parameters on the level of vibrations. This is addressed in this resea...
Talent identification and training the athletes of the basic levels in track and field requires codifying a proper model like any other system so that any duplication is prevented as well as knowing the right path. The federation of track and field started to codify the national talent-identification scheme in track and field in 1385. Hence, the present studies track-and-field talent-identifi...
In the pursuit of success in the world, Iran track and field requires to use a single and well-codified talent identification system. The present study aimed to design a model for Iran track and field talent identification. The research methodology was qualitative in the form of three stages. The first stage involved the content analysis of researches on talent identification. The second stage...
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