Abstract Floods are the most common natural disasters on earth. Population growth with global warming and climate changes increases impact of floods people every year. Combating such as is possible effective disaster management. An management can only be a comprehensive risk analysis. Flood risks depend many factors precipitation, flow, earth slope, soil structure, population density. A holisti...

In this paper, we consider hyperbolic relaxation systems arising from dynamic continuum traffic flow models including the well-known Payne and Whitham (PW) model. The equilibrium characteristic speed resonates with one characteristic speed of the full relaxation system in many physical scenarios in traffic flow, for which the usual subcharacteristic condition only marginally holds. In spite of ...

We derive improved versions of the relations between supermassive black hole mass (MBH) and host-galaxy bulge velocity dispersion (σ) and luminosity (L) (the M–σ and M–L relations), based on 49 MBH measurements and 19 upper limits. Particular attention is paid to recovery of the intrinsic scatter (ε0) in both relations. We find log(MBH/M ) = α + β log(σ/200 km s−1) with (α, β, ε0) = (8.12± 0.08...

Fire eruption (also known as ‘blow-up’ or ‘flare-up’) is a very dangerous aspect of wildland fire behaviour. It poses a significant threat to the safety of wildland fire-fighters and complicates the broader problem of wildfire risk management in complex terrain. Despite the seriousness of eruptive fire events, operational wildland fire spread models generally do not account for the possibility ...

construction of railway embankments on loose beds without using any methods of soil improvement (e.g. stone columns in silt and clay beds, deep soil mixing method, jet grouting and also using micropiles individually or in groups form) leads to  reduction of embankment slope gradient, which significantly increases the volume of soil operation. generally, micropile as a reinforcing element with t...

A novel PVC membrane sensor for the Sr ion based on 1,10-diaza-5,6-benzo-4,7dioxacyclohexadecane-2,9-dione has been prepared. The sensor possesses a Nernstian slope of 30.0 ± 0.6 mV decade over a wide linear concentration range of 1.6 × 10-3.0 ×10 M with a detection limit of 6.3 ×10 M. It has a fast response time of <15 s and can be used for at least two months without any considerable divergen...

A high-pressure phase transition in iron free MgSiO3 perovskite, the most abundant Earth forming mineral phase, was discovered and reported in 2003-2004. Here, we summarize our theoretical and computational studies on this phase transition and on the physical properties of the newly found post-perovskite phase. The theoretical approach is based on density functional theory and on the plane-wave...