In this paper, synthesised nanometre sized hydroxyapatite (nano-HAP) powders composed of spherical 30 ± 5 nm part icles were compacted and sintered at temperatures ranging from 650 to 1250°C to form ceramics of varying porosity and mechanical strength. The size, crystalline structure and morphology of both the synthesised nano-HAP particle powders and the compacted and sintered ceramics were in...

This article follows the authors’ previous works on numerical simulations of biomass drying and devolatilization (Juřena et al., 2009a-b), in which a packed bed of solid fuel particles is treated as a continuous porous medium. The bed model consists of several sub-models describing individual combustion processes. Since packing conditions change markedly during the processes, a proper descripti...

Rice husk and straw are by-products of rice cultivation and processing industry and can be used as an energy source. Proper understanding of the physical properties of rice residues is necessary for utilizing them in thermochemical conversion processes such as gasification and combustion. The physical properties (moisture content, particle size, bulk density and porosity) of rice husks and stra...

Manuel Alfonseca,1 Manuel Cebrian,2 Antonio Fernandez Anta,3 Lorenzo Coviello,4 Andres Abeliuk,5 and Iyad Rahwan6 Escuela Politécnica Superior, Universidad Autónoma de Madrid, Madrid, Spain Data61 Unit, Commonwealth Scientific and Industrial Research Organisation, Melbourne, Victoria, Australia IMDEA Networks Institute, Madrid, Spain Google, USA Melbourne School of Engineering, University of Me...

As we progress in the exciting area of treatment of acute myocardial infarction, two clinical trial methodologies coming from different philosophies and traditions must be considered. Smaller (200-3000 patient), detailed trials focusing on pathophysiology will be referred to as "mini-trials", while mammoth studies (10 000-50 000 patients) designed to measure mortality rates will be referred to ...

The string matching problem on a node-labeled graph $$G=(V,E)$$ asks whether given pattern P has an occurrence in G, the form of path whose concatenation node labels equals P. This is basic primitive various problems bioinformatics, databases, or networks, but only recently proven to have O(|E||P|)-time lower bound, under Orthogonal Vectors Hypothesis (OVH). We consider here its indexed version...

Using molecular dynamics simulations, we have determined that the nature of dynamical heterogeneity in jammed liquids is very sensitive to short-ranged attractions. Weakly attractive systems differ little from dense hard-sphere and Lennard-Jones fluids. Particle motion is punctuated and tends to proceed in steps of roughly a single particle diameter. Both of these basic features change in the p...

As we progress in the exciting area of treatment of acute myocardial infarction, two clinical trial methodologies coming from different philosophies and traditions must be considered. Smaller (200-3000 patient), detailed trials focusing on pathophysiology will be referred to as "mini-trials", while mammoth studies (10 000-50 000 patients) designed to measure mortality rates will be referred to ...

A vacuum microplasma spray system, operating on gross power levels of 1-3 kW, with powder feed rates below 1 g/min and using plasma gas mixtures of argon and hydrogen, was built and tested. In order to improve the deposition efficiency and quality of coatings, the system was analyzed and the matter of particle entrainment into the plasma jet core was identified as a critical sub-process. Partic...