DasCladonio rangiferinae-Pinetum sylvestris des Landschaftsschutzgebietes Křivoklátsko (Mittelböhmen) und seine Stellung im phytozönologischen System
The pine forest with an undergrowth of fruticose lichens—Cladonio rangiferinae-Pinetum sylvestris (Kobenza 1930) em.Passarge 1956 from the protected landscape area KřizoklätsCladonio-Pinetum comprises a permanent pine forest community occurring naturally on a hard base and nutrient deficient siliceous rocks in the semiconvex parts of the steep slopes of narrow side-valleys of the Berounka river. The soil type of this community is dystrophic ranker. The phytosociological composition of theCladonio-Pinetum is documented by the table of relevés, the habitat by chemical analyses of the soil.
Vegetation surveys in the circumboreal coniferous forests: A review
As an introduction to the special issue “Vegetation of Circumboreal Coniferous Forests”, a brief history is provided of the development and present state of floristic vegetation surveys of the boreal and mountain coniferous forests of Europe, northern Asia and North America. The focus is on forests assigned to the phytosociological classVaccinio-Piceetea and closely related vegetation types.
Characterization of ceramic composite membrane filters for hot gas cleaning
Abstract Novel composite ceramic membrane filters suitable for hot gas cleaning operations have been prepared from fly ash and titania particles on stainless steel woven mesh substrates. Both membranes had a structure like a solid packed bed with a thickness of less than 100 μm. In the domain of laminar flow, significant differences in the pressure drop between experimental results and those predicted from the Kozeny-Carman relationship were found, particularly for flow through the titania membrane. Membrane filters with extremely small pores such as the titania membrane are greatly affected by slip up to 80% in permeability at elevated temperatures. Efficiencies of filtration of typical coal fired power station exhaust fly ashes were found to be greater than 909% for both titania and ash membranes, whilst there was greater variation in the pressure drops in the ash membrane than in the titania at typical gas flows.