Field Statistics in a One-Dimensional Reverberation Chamber Model

This work focuses on building a fairly simple yet physically appropriate 1D model for a Reverberation Chamber which claims to be able to analytically predict the statistical behavior of such a chamber, without forsaking to the benefits of deterministic models. The statistical properties are introduced by varying the size of a 1D stirrer or the cavity size itself. A validation analysis shows agreement with other theories and measured results on real RCs. Field statistics in undermoded regime is examined. A radiated emission test is defined and shows reliable matching with reality. The field performance near the conducting walls is investigate

Nephrolithiasis is associated with an increased prevalence of cardiovascular disease

Background: Nephrolithiasis has been associated with hypertension, obesity and diabetes Mellitus. The prevalence of adverse cardiovascular outcomes among kidney stone formers (KSF) is unknown. Methods: We examined the IV Portuguese National Health Survey for documenting possible associations between nephrolithiasis, cardiovascular diseases, diabetes and obesity in the Portuguese adult population. Results: We obtained 23,349 questionnaires from individuals with ≥ 15 year-old. The prevalence of kidney stone disease was 7.3%. The prevalence of hypertension was higher among KSF when compared with the general population (50.4% vs. 30.2%; p < 0,001). Age and obesity significantly increase the risk for nephrolithiasis. After adjusting for age and body mass index, KSF have higher prevalence of hypertension (odds-ratio: 1.841; 95% CI: 1.651 – 2.053), diabetes Mellitus (odds-ratio: 1.475; 95% CI: 1.283 – 1.696; p < 0.001), myocardial infarction (odds-ratio: 1.338; 95% CI: 1.003 – 1.786; p < 0.05), and stroke (odds-ratio: 1.330; 95% CI: 1.015 – 1.743; p < 0.05) as compared with non-stone formers. Conclusions: Kidney stone disease is associated with a higher prevalence of chronic diseases and adverse cardiovascular outcomes when compared with the general population