In this work, an experimental study of biomass gasification in different operation conditions has been carried out in an updraft gasifier combined with a porous ceramic reformer. The effects of gasifier temperature, steam to biomass ratio (S/B), and reforming temperature on the gas characteristic parameters were investigated with and without porous ceramic filled in reformer. The results indica...

A three-dimensional radar simulator model (RSM) developed by Haase (1998) is coupled with the nonhydrostatic mesoscale weather forecast model Lokal-Modell (LM). The radar simulator is able to model reflectivity measurements by using the following meteorological fields, generated by Lokal Modell, as inputs: temperature, pressure, water vapour content, cloud water content, cloud ice content, rain...

A momentum-balance theory for the orientation of updrafts in density currents is developed understanding squall-line–shear interactions. The motivation arises from studies showing diagnostic limitations vorticity-balance by Rotunno et al. (1988) (RKW theory) under varying shear profiles, together with flow-force balance constraint (FFB) which determines shear-layer depth optimal currents. Consi...

“Key competencies”, "key skills" and “key qualifications” are buzzwords so prominently featured in contemporary scientific treatises that discussions have been prompted about an inflationary use of the terms and what they really should be taken to mean. A similar situation exists in the field of ICT and CS education: What meaning should we ascribe to terms such as “skill”, “competency” and “qua...

An attempt is made to explain the mechanism of a hook-echo formation on the southwestern cdgc of an eastward-moving cumulonimbus cell. The conditions necessary for originating a hook-echo circulation through this proposed mechanism are: significant absolute vorticity within the subcloud layer, intcn,se updraft to bring the low-level moist air into the cloud, and a vertical wind shear which stee...

Hudson et al. [2012, hereafter H12] have lately shown that the standard deviation (σ) of droplet size distributions was inversely related to cloud condensation nuclei (CCN) concentration at 1% supersaturation (NCCN) for the in situ aircraft measurements collected during the Rain in Cumulus over the Ocean (RICO) project. Using adiabatic parcel model simulations for various values of updraft velo...

This article describes modelling and simulation advances for the gasification systems. The generalized approach pursued in developing the models allows to characterize the main phenomena involved in the gasification process of coal, biomass and organic wastes. Actually, multi-scale, multi-phase, and multicomponent systems are described by means of complex kinetic mechanisms for gas-solid phases...

Ducted gravity waves are associated with potentially large perturbations in horizontal winds. It may be shown, neglecting friction, that these perturbations are maximized at the surface and minimized at the top of the wave duct, producing perturbation vertical wind shear as well. The magnitude of this shear is maximized in the wave ridge and the wave trough. The perturbation shear may be signif...