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The relationship between fluorosis and the lifestyle of adult residents of areas in which fluorosis is endemic was evaluated. A cross-sectional and case-control analysis was performed to study 289 villagers living in fluorosis endemic areas who drank the local water. Subjects were divided into skeletal fluorosis and non-skeletal fluorosis groups according(More)
In communication networks, greater degrees of stability or less vulnerability is required. The vulnerability of communication network measures the resistance of the network to the disruption of operation after the failure of certain stations or communication links. If the network begins losing communication links or processors, then there is a loss in its(More)
OBJECTIVE To study the prevalence and risk factors of chronic obstructive pulmonary disease (COPD) in Heilongjiang province. METHODS This was a population-based and cross-sectional survey on prevalence of COPD in Heilongjiang province from September 2013 to March 2014. The stratified-cluster-random sampling method was performed to collect the data from 4(More)
Computer or communication networks are so designed that they don't easily get disrupted under external attack and, moreover, these are easily reconstructed when they do get disrupted. These desirable properties of networks can be measured by various parameters such as connectivity, toughness, tenacity and rupture degree. Among these parameters , tenacity(More)
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