Objective： To identify the main character- istics of victims of motorcycle accidents in Fars Province, Iran. Methods： This cross-sectional study was conducted in Fars Province which has the fourth largest populatio...Objective： To identify the main character- istics of victims of motorcycle accidents in Fars Province, Iran. Methods： This cross-sectional study was conducted in Fars Province which has the fourth largest population of all 31 provinces in Iran from March 2009 to June 2010. We included data from all 542 recorded cases of fatalities due to motor vehicle accidents. Data were recorded from the foren- sic medicine registry consisting of demographic and acci- dent-related information. Demographic information con- sisted of name, age, sex, status of fatal victim （motorcycle driver vs passenger） and educational level. Results： Of the 2 345 autopsy records from the foren- sic medicine archives, 542 （23.1%） gave the cause of death as motor vehicle accidents. Mean age of these victims was （31.4±16.5） years, and the male to female ratio was 28. Head injury was the most common cause of death in these victims, and overall they tended to have a low level of education. Motorcycle accidents frequently involved younger age groups （15-35 years）, and head trauma related with non-use of a helmet was the most common cause of death. Conclusions： Head injury is frequent among victims in the province we studied. This situation may be related to the victims＇ low socioeconomic status and little education regarding traffic laws leading to speeding and disregard of these laws along with their weak enforcement.展开更多
This paper considers global asymptotic properties for an age-structured model of heroin use based on the principles of mathematical epidemiology where the incidence rate depends on the age of susceptible individuals. ...This paper considers global asymptotic properties for an age-structured model of heroin use based on the principles of mathematical epidemiology where the incidence rate depends on the age of susceptible individuals. The basic reproduction number of the heroin spread is obtained. It completely determines the stability of equilibria. By using the direct Lyapunov method with Volterra type Lyapunov function, the authors show that the drug-free equilibrium is globally asymptotically stable if the basic reproduction number is less than one, and the unique drug spread equilibrium is globally asymptotically stable if the basic reproduction number is greater than one.展开更多
文摘Objective： To identify the main character- istics of victims of motorcycle accidents in Fars Province, Iran. Methods： This cross-sectional study was conducted in Fars Province which has the fourth largest population of all 31 provinces in Iran from March 2009 to June 2010. We included data from all 542 recorded cases of fatalities due to motor vehicle accidents. Data were recorded from the foren- sic medicine registry consisting of demographic and acci- dent-related information. Demographic information con- sisted of name, age, sex, status of fatal victim （motorcycle driver vs passenger） and educational level. Results： Of the 2 345 autopsy records from the foren- sic medicine archives, 542 （23.1%） gave the cause of death as motor vehicle accidents. Mean age of these victims was （31.4±16.5） years, and the male to female ratio was 28. Head injury was the most common cause of death in these victims, and overall they tended to have a low level of education. Motorcycle accidents frequently involved younger age groups （15-35 years）, and head trauma related with non-use of a helmet was the most common cause of death. Conclusions： Head injury is frequent among victims in the province we studied. This situation may be related to the victims＇ low socioeconomic status and little education regarding traffic laws leading to speeding and disregard of these laws along with their weak enforcement.
基金supported partially by the National Natural Science Foundation of China under Grant Nos.1127131411371305
文摘This paper considers global asymptotic properties for an age-structured model of heroin use based on the principles of mathematical epidemiology where the incidence rate depends on the age of susceptible individuals. The basic reproduction number of the heroin spread is obtained. It completely determines the stability of equilibria. By using the direct Lyapunov method with Volterra type Lyapunov function, the authors show that the drug-free equilibrium is globally asymptotically stable if the basic reproduction number is less than one, and the unique drug spread equilibrium is globally asymptotically stable if the basic reproduction number is greater than one.
