نتایج جستجو برای: atmospheric lifetime
تعداد نتایج: 131217 فیلتر نتایج به سال:
BACKGROUND Inhalation is one of the main means of human exposure to polycyclic aromatic hydrocarbons (PAHs) because of their ubiquitous presence in the atmosphere. However, most studies have considered only PAHs found in the particle phase and have omitted the contribution of the gas-phase PAHs to the risk. OBJECTIVE We estimated the lifetime lung cancer risk from PAH exposure by inhalation i...
This thesis reports a measurement of the average lifetime of hadrons containing bottom quarks. It is based on data taken with the DELCO detector at the PEP e+estorage ring at a center of mass energy of 29 GeV. The decays of hadrons containing bottom quarks are tagged in hadronic events by the presence of electrons with a large component of momentum transverse to the event axis. Such electrons a...
In this study, three receptor models [factor analysis/multiple linear regression (FA/MLR), positive matrix factorization (PMF) and UNMIX] were applied seasonally to investigate the source apportionment of PAHs in the atmospheric environment of Alexandria, and a lifetime cancer risk was assessed. ∑44 (gas+particle) PAH concentrations varied from 330 to 1770ngm(-3) and 170-1290ngm(-3) in the summ...
Printed Circuit Board (PCB) is a major component of the electronic device and it has been used in diverse extreme environment such as data center near coast. In this study, simulation model was to predict corrosion lifetime PCBs marine atmospheric environments. The devised considering dimensions PCB, biased voltage, salt To prove validity proposed model, spray acceleration test conducted. Final...
Abstract. Observations of winds in the planetary boundary layer remain sparse making it challenging to simulate and predict atmospheric conditions that are most important for describing predicting urban air quality. Short-lived chemicals observed as plumes whose location is affected by lifetime height mixing. Here we investigate application data assimilation NO2 columns will be from geostationa...
This paper explores the structure-relationships involved in degradation of fluorosilicones (FVMQs). For that purpose, FVMQs are thermally aged at 280 °C under various atmospheres (nitrogen, atmospheric air, pure oxygen). It seems undergo a strong mass loss irrespectively atmosphere. Under nitrogen, chain scission (unzipping) mechanism is suspected whereas crosslinking mechanisms leads to an inc...
objective: the current study was undertaken to examine the bactericide effects of atmospheric plasma produced by flat and comb electrodes on e.coli. materials and methods: dc (20 w) and ac (500 w) power supplies, flat and comb electrodes, insulator and oxygen gas were used to produce atmospheric plasma. bactericide effects of the atmospheric plasma were studied on e.coli on sterilized plate pla...
We develop how a notion of e ective scale can be introduced in a formal way. For continuous signals a scaling argument directly gives that a natural unit for measuring scale-space lifetime is in terms of the logarithm of the ordinary scale parameter. That approach is, however, not appropriate for discrete signals, since then an in nite lifetime would be assigned to structures existing in the or...
In this paper, acceptance sampling plans are developed for the odds exponential log logistic distribution (OELLD) introduced by Rosaiah et al. [1] based on lifetime percentiles when the life test is truncated at a predetermined time. The minimum sample size necessary to ensure the specified lifetime percentile is obtained under a given customer’s risk. The operating characteristic values of the...
Breast cancer is the most common cause of cancer deaths among Australian women. In NSW in 1999, 3,463 women were newly diagnosed with breast cancer. The average lifetime risk of breast cancer is about one in 11 women. Each year, over 2,600 women in Australia die from the disease. It is estimated that it costs Australia $169.5 million to diagnose and treat the disease and there are considerable ...
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