نتایج جستجو برای: which have lower altitudes
تعداد نتایج: 5424114 فیلتر نتایج به سال:
all analytical methods are generally based on the measurement of a parameter or parameters which are somehow related to the concentration of the species.an ideal analytical method is one in which the concentration of a species can be measured to a high degree precision and accuracy and with a high sensitivity. unfortunately finding such a method is very difficult or sometimes even impossible.in...
Distribution of the vector species is a major risk factor for the endemicity of leishmaniasis. In the present study, the vertical distribution of Lutzomyia (Lu.) ayacuchensis, the vector of Leishmania (Leishmania) mexicana in the Ecuadorian Andes, was surveyed at different altitudes (300-2500m above sea level) of the Andean slope. The vector species Lu. ayacuchensis was identified at an altitud...
We present the first simultaneous measurements of HOx, NOx, and Clx radicals in the middle stratosphere obtained during a balloon flight at 34 N in September 1989, along with calculations from a photochemical model, to show that NOx catalytic cycles dominate loss of ozone (O3) for altitudes between 24 and 38 km; the observed abundance of ClO is lower than that expected for altitudes above 30 km...
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