PURPOSE To determine cortical influence on the efferent medial olivocochlear bundle system. RESEARCH DESIGN The effects of attention on contralateral suppression (CS) of click-evoked otoacoustic emissions were measured. STUDY SAMPLE Fifteen normal-hearing listeners. RESULTS CS was greatest in the nonattending condition and decreased significantly when attending to the click or broadband n...

hyperbilirubinemia at neonatal period is one of the major deteriorating factors of the auditory system. if left untreated, it may cause certain cerebral damage. this study aims to evaluate the impact of hyperbilirubinemia on the hearing of neonate. this study was conducted on 35 newborn babies with jaundice (bilirubin more than 20 mg/dl). auditory brainstem response (abr) and transient evoked o...

background: noise-induced hearing loss (nihl) is one of the most common occupational illnesses. most of the studies on nihl were conducted at high noise levels that people are rarely exposed to but in industries. the function of the outer hair cells (ohcs) is impaired after exposure to industrial noise. distortion product otoacoustic emissions (dpoaes) are useful in examination of noise-induced...

background: noise-induced hearing loss (nihl) is a common, irreversible occupational disease. statins have recently been proposed to prevent nihl. objective: to assess the effect of atorvastatin for the prevention of nihl in rats. methods: in this experimental study, forty 2–3-month-old wistar male rats were divided into 5 groups of 8 animals. 3 groups of rats received atorvastatin at doses of ...

Vehicular emissions have increased considerably over the years with the increase in traffic. Modern roundabouts can improve traffic flow as well as cut down vehicular emissions and fuel consumption by reducing the vehicle idle time at intersections and thereby creating a positive impact on the environment. The primary focus of this research is to study the impact of modern roundabouts in cuttin...

A traditional traffic signal control system is established based on vehicular delay, queue length, saturation and other indicators. However, due to the increasing severity of urban environmental pollution issues and the development of a resource-saving and environmentally friendly social philosophy, the development of low-carbon and energy-efficient urban transport is required. This paper first...

Vehicle exhaust emissions have posed a serious threat in recent years to the urban air quality of Beijing. It is necessary to accurately estimate the magnitude and distribution of these emissions in order to reduce the uncertainty of local scale air quality modeling assessment. This paper provides a bottom-up approach by combining vehicle emission factors and vehicle activity data from a travel...