نتایج جستجو برای: diurnal variations
تعداد نتایج: 200564 فیلتر نتایج به سال:
Diurnal variations in ventricular tachyarrhythmias (VAs) have been demonstrated in idiopathic arrhythmogenic heart disease. The electrophysiological characteristics of diurnal variations in idiopathic right ventricular outflow tract (RVOT) VA have not previously been elucidated. Sixty-two consecutive patients undergoing catheter ablation for idiopathic RVOT VA (mean age: 42.8 ± 12.3 years, 35 f...
In recent decades, high ambient ozone concentrations have become one of the major regional air quality issues in the Pearl River Delta (PRD) region. Non-methane hydrocarbons (NMHCs), as key precursors of ozone, were found to be the limiting factor in photochemical ozone formation for large areas in the PRD. For source apportioning of NMHCs as well as ozone pollution control strategies, it is ne...
There is paucity of information on the diurnal variation in electrocardiogram (ECG) parameters of normal individuals, especially those subjected to physical exertion. The aim of the study was to determine changes in patterns of ECG intervals of normal young adults with variations in hours of the day, and to compare the changes between athletes and non-athletes. The study investigated resting EC...
Diurnal variation of baseline startle amplitude was examined in 14 normal inpatients on a research unit where behavioral activity and environmental stimuli were highly controlled. We tested a hypothesized association between diurnal variations of salivary cortisol and reflex amplitude by recording acoustic startle eyeblinks shortly before bedtime, when cortisol was near its lowest daily level, ...
When using dynamic simulation for fine tuning of the design of activated sludge (AS) plants diurnal variations of influent data are required. For this application usually only data from the design process and no measured data are available. In this paper a simple method to generate diurnal variations of wastewater flow and concentrations is described. The aim is to generate realistic influent d...
AbstructData from the Ku-band SeaWinds scatterometer is used to investigate the extent of the ice facies in Greenland. The duration of the summer melt over the Greenland ice sheet is calculated using the temporal signature of the SeaWinds data. Daily ascending and descending enhanced resolution radar backscatter images of Greenland are produced to investigate diurnal variations in backscatter m...
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