نتایج جستجو برای: atmosphere
تعداد نتایج: 54710 فیلتر نتایج به سال:
particulate matters commonly found dispersed in the atmosphere are composed of a large variety of substances. dustfall is the usual index of particles in the size range greater than 10 m. two semi automated so2 sampling units were installed in tehran university campus (from 21 january 1973 to 22 dec. 1974) and gheitarieh area (from 23 august to 23 oct. 1974) hydrogen peroxide method was used fo...
the main sources of human exposure to trace metals for non-occupationally exposed individualsare inhalation and ingestion. because the absorption rates of the metals by inhalation are significantly higher (up to 50-60%) than those by ingestion (between 3% and 10%), determination of trace metals in ambient air samples is of special interest. the main purpose of this study was to determine fe, zn...
Observations made during the New Horizons flyby provide a detailed snapshot of the current state of Pluto's atmosphere. Whereas the lower atmosphere (at altitudes of less than 200 kilometers) is consistent with ground-based stellar occultations, the upper atmosphere is much colder and more compact than indicated by pre-encounter models. Molecular nitrogen (N2) dominates the atmosphere (at altit...
A method for numerically solving the equation of radiative transfer in a spherical shell atmosphere is presented. The method uses a conical boundary and a Gauss-Seidel iteration scheme to solve for all orders of scattering along a single radial line in the atmosphere. Tests of the model indicate an accuracy better than 1% for most Earth-atmosphere situations. Results from this model are compare...
The atmosphere is an oxidizing medium. Many environmentally important trace gases emitted from the Earth’s surface are removed from the atmosphere by oxidation. The list includes methane and other organic compounds, carbon monoxide, nitrogen oxides, and sulfur gases (Table 1). Understanding the processes and rates by which species are oxidized in the atmosphere, i.e., the oxidizing power of the...
This study defines the construct of team atmosphere and provides a framework within which causes and consequences of team atmosphere in knowledge transfer and creation can be empirically investigated. Data were collected using a survey of 363 individuals of 12 companies who worked in self-managed teams. As predicted, results indicated that a ‘high care’ atmosphere among team members favours bot...
effect of controlled atmospheres (cas) at various concentrations of co2, n2 and o2 on the lethal times of tribolium castaneum and trogoderma granarium was investigated at 20 and 30 ºc. experiments were performed using a recirculatory multi-flask apparatus. the results revealed that, the shortest times (0.1, 0.3 and 0.9 day for adults, larvae and pupae, respectively) required to obtain 50% morta...
abstract background: processes such as drying, sauce making, extracting and doping reduced nutritional value and unique sensory characteristics of pomegranate. on the other hand, the difficulty in peeling and removing the arils has limited its fresh consumption. for this reason, the “ready-to-eat” pomegranate may represent a possible option to implement fresh fruit consumption. in this study, t...
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