نتایج جستجو برای: and international ambient
تعداد نتایج: 16878472 فیلتر نتایج به سال:
there is little consensus on the corporate diversification-efficiency relationship in the diversification literature. the study aims to contribute to the literature by looking jointly at two dimensions of corporate diversification as product diversification and international diversification and the relationship between them. the results show negative relationship between product diversification...
In this paper a gas turbine power plant including air preheater (recuperator), heat recovery steam generator and air cooler system was modeled. Eight parameters were selected as the design variables. Fast and elitist non-dominated sorting genetic algorithm (NSGA-II) was applied (to maximize the exergy efficiency and to minimize the total cost rate) for the mentioned cogeneration system. Th...
the main objective of a research program, whose output is presented here, has been to estimate “ventilation coefficientsâ€, a critical parameter in determining air pollution concentration near the surface ground which signifies the ability for natural ventilation of an air shed in an urban or rural area. relevant measured data from the city of tehran has been used to calibrate and further de...
The outbreak of coronavirus disease (COVID-19) was first reported from Wuhan, China, on December 31st, 2019. As the number of coronavirus infections has exceeded 100,000 with toll deaths of about 5000 worldwide as of early March, 2020, scientists and researchers are racing to investigate the nature of this virus and evaluate the short and long term effects of this disease. Despite it...
Background: The accurate results of the individual doses in personal dosimety which are reported by the service providers in personal dosimetry are very important. There are national / international criteria for acceptable dosimetry system performance.Objective: In this research, the sources of uncertainties are identified, measured and calculated in a personal dosimetry system by TLD.Method: T...
Background and Objective: Human external exposure to natural radiation sources is much more than artificial radiation sources. In this study, external annual effective doses were estimated in cities of Gorgan and Bandar-Torkman by determining ambient gamma dose rate in indoor and outdoor spaces. Materials and Methods: Using an ionization chamber detector, the outdoor and indoor ambient gamma d...
UNLABELLED We examined the association of infant bronchiolitis with acute exposure to ambient air pollutants. DESIGN We employed a time-stratified case-crossover method and based the exposure windows on a priori, biologically based hypotheses. PARTICIPANTS We evaluated effects in 19,901 infants in the South Coast Air Basin of California in 1995-2000 with a hospital discharge record for bron...
This paper is two-fold. In the first part it tries to raise awareness on the level of complexity of future computer-based interconnected systems/infrastructures, at least as they are envisioned, and on the level of dependability we are today able to justify with confidence. It tries to motivate that fundamental methods and methodologies must be reconsidered, studied, exploited, assessed and app...
To determine the distribution of lead in ambient air of Hamadan, 100 samples were taken in different places from December 1997 until June 1998. The places of samples collection , were divided to three locations in street (high traffic, medium traffic and...
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