نتایج جستجو برای: 2 over the sahara globally
تعداد نتایج: 16557955 فیلتر نتایج به سال:
The high barriers to entry in the former elite telecom industry have been torn down, leaving a brutally competitive market, where over-the-top (OTT) providers like Vonage, Skype, Netflix and others, with no desire to own a network, provide offerings that ride on top of CSP networks.
Migrating long distances requires time and energy, and may interact with an individual's performance during breeding. These seasonal interactions in migratory animals are best described in populations with disjunct nonbreeding distributions. The black-tailed godwit (Limosa limosa limosa), which breeds in agricultural grasslands in Western Europe, has such a disjunct nonbreeding distribution: Th...
the issue of curriculum and syllabus evaluation and revision has been in center of attention right from when curriculum came into attention of educational institutions. thus everywhere in the world in educational institutions curricula and syllabi are evaluated and revised based on the goals, the needs, existing content, etc.. in iran any curriculum is designed in a committee of specialists and...
Plants show varied cellular responses to salinity that are partly associated with maintaining low cytosolic Na(+) levels and a high K(+)/Na(+) ratio. Plant metabolites change with elevated Na(+), some changes are likely to help restore osmotic balance while others protect Na(+)-sensitive proteins. Metabolic responses to salt stress are described for two barley (Hordeum vulgare L.) cultivars, Sa...
Each year more than two billion songbirds cross the Sahara, but how they perform this formidable task is largely unknown. Using geolocation tracks from 27 pied flycatchers, a nocturnally migrating passerine, we show that most birds made diurnal flights in both autumn and spring. These diurnal flights were estimated to be part of non-stop flights of mostly 40-60 h. In spring, birds flew across t...
The purpose of this research is the ex-post evaluation efficiency agricultural development projects for period 2000-2009. analysis had been based upon a random sample 244 perimeters spread over 15 departments among which 75 are located in mountainous zone, 98 steppe zone and 51 Sahara zone. DEA (Data Envelopment Analysis) method used to calculate projects. selected outputs represent number deve...
Background and aims: The Globally Harmonized System of Classification and Labeling of Chemicals (GHS) is an internationally agreed-upon standard developed by the United Nations to replace the previously used hazardous material classification and labelling all over the world, including Iran. The purpose of this study was to evaluate the perception of GHS, compared to old chemical hazard signs in...
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