نتایج جستجو برای: velocity and iso
تعداد نتایج: 16846879 فیلتر نتایج به سال:
flow in natural river bends is a complex and turbulent phenomenon which affects the scour and sedimentations and causes an irregular bed topography on the bed. for the reason, the flow hydralics and the parameters which affect the flow to be studied and understand. in this study the effect of bed and wall roughness using the software fluent discussed in a sharp 90-degree flume bend with 40.3cm ...
seismic refraction and downhole survey were employed to study dynamic characteristics of subsurface materials in bam city, southeast of iran. the data acquisition was performed at 160 p and s-wave refraction stations and 15 boreholes in the city. to derive velocity depth sections along these profiles as well as to perform downhole diagrams, seisimager software was used. based on the obtained va...
Entropy generation of double diffusive natural convection in a three dimensional differentially heated enclosure has been performed numerically. Vertical walls of enclosure are heated differentially and remaining walls are adiabatic. The obtained results were presented via iso-concentration, iso-temperatures, velocity vector projection, particle trajectories, velocity profiles, iso-entropy, loc...
in the first part of this thesis we explored wetting and its dynamics for small droplets. first, we showed how a simple feature of water droplets on a surface, i.e. laplace pressure, can be exploited to build a micropump. we investigated capillary pumping in microchannels both experimentally and numerically. putting two droplets of different sizes at the in/outlet of a microchannel, will ge...
Effects of modifying the palm adapter geometry on ISO 10819 antivibration glove test results were investigated. 30 rigid acrylic adapters were designed, fabricated, and evaluated. The length of the adapters that met ISO 10819 requirements covered 70-80% of the width of the palm. The upper curvatures of the adaptors were greater than or equal to the radius specified in ISO 10819:1996. Glove vibr...
background : necessity of evaluating heat stress in the workplace, require validation of indices and selection optimal index. the present study aimed to assess the precision and validity of some heat stress indices and select the optimum index for using in heavy work activities in hot and dry climates. methods: it carried out on 184 workers from 40 brick kilns workshops in the city of qom, cent...
Kashan Erg is one of the most important sand dunes complexes in Iran. Due to erosive winds, always, Erg's marginal areas are faced to the transition of moving sands. So, in this research, the sand dune activity was investigated by Lancaster index. In this line, Erg's morphology map was prepared using aerial photographic, Google earth software and field observations. Then, maps of iso...
Dieser Konferenzbeitrag stellt Erfolgsfaktoren und Misserfolgsfaktoren der Anwendungsentwicklung dar. Grundlage hierfür bilden empirische Untersuchungen des Jahres 2009. Diese Erfolgsund Misserfolgsfaktoren werden anhand der Klassifikation der ISO / IEC 12207 und ISO / IEC 15288 gruppiert und diskutiert. 1 Hintergrund und Basis des vorliegenden Konferenzbeitrags Dieses Paper basiert auf empiris...
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