Showing papers in "Advanced Powder Technology in 2004"

TL;DR: In this paper, 3D pseudo-shape descriptors are proposed for characterising the particle shapes based on the complete coverage by a set of images of the particle projections in three mutually perpendicular directions.

TL;DR: It is shown that the half-step leapfrog Verlet algorithm is the best integration scheme, while Euler is poor in terms of accuracy and stability and the no n-linear damping model was less stable.

TL;DR: In this paper, a vertical-axis mixer with a disk impeller rotating at 100 r.p.m. was used to model the contact mechanics between the particles and the walls.

TL;DR: In this paper, a planetary ball mill was used to investigate mechanochemical dechlorination of polyvinyl chloride powder with one of the oxide powders, i.e., CaO, Fe 2 O 3, SiO 2 and Al 2O 3, in air by a planetary-ball mill to investigate the mechanochemical degradation of PVC.

TL;DR: In this paper, the effects of mixing time on the characteristics of tablet formulation were investigated by using two types of mixers (twin-shell and high-speed mixers) and three kinds of excipients for the direct compression were mixed with a lubricant, MgSt.

TL;DR: In this article, the authors present an overview of the general multiscale approaches, including the sequential approach, iterative/concurrent approach and the variational multi-scale approach, applicable to multiphase flow and reaction systems.

TL;DR: In this paper, a study has been conducted on the flotation concentration of sedimentary phosphorite from Sierra Espuna, in the province of Murcia (Spain), using a Denver D-12 mechanical subaeration cell.

TL;DR: In this article, a study on the precipitation of highly dispersed magnesium silicate was conducted, where solutions of sodium metasilicate and of magnesium salts [chloride, sulfate(VI) or nitrate(V)] were employed.

TL;DR: In this paper, solidified alumina slurries were thinned and observed with an optical microscope, and significant changes in particle dispersion were successfully observed even in the range where the viscosity of slurry was substantially constant.

TL;DR: In this paper, a simple two-phase model, a dynamic twophase model and a generalized bubbling/turbulent model were investigated for catalytic reactions in the presence of different catalysts.

TL;DR: In this paper, the feasibility of some commonly adopted microscopic and tomographic techniques for investigating the sludge floc structure was briefly reviewed and a comparison was made based on their capability to probe the wastewater sludge at different scales.

TL;DR: In this article, a model of particle impact degradation during dilute-phase pneumatic conveying is developed, which combines a degradation model, based on the experimental determination of breakage matrices, and a physical model of solids and gas flow in the pipeline.

TL;DR: In this paper, the floating and sinking of different density spheres in a gas-solid fluidized bed was investigated by changing the superficial air velocity, bed height, particle diameter and sphere diameter.

TL;DR: In this paper, LiManganate fine powders were continuously produced by internal combustion-type spray pyrolysis, and as-prepared particles were crystallized to a spinel structure with a Fd3m space group.

TL;DR: In this article, a simulation model is proposed for the dense packing of particulate, spherical material, which assumes that the centers of the spheres are randomly generated at the grid of the cubic lattice.

TL;DR: In this paper, a method for calculating particle impact degradation propensity under a range of particle velocities and particle sizes is presented. But this method is based on interpolation on impact data obtained in a new laboratory-scale degradation tester.

TL;DR: In this article, the effect of the particle size distribution of bed materials or high temperature on the quality of fluidization was examined, where four particle size distributions of silica were fluidized in air at atmospheric pressure, from 500 to 800°C.

TL;DR: In this article, two types of coal, South Blackwater and Ensham coal, were tested in single-particle breakage tests using a laser detector, computer-monitored twin pendulum breakage apparatus to measure the energy utilization pattern of the breakage particles.

TL;DR: In this article, the normal and shear deformation behavior of poly-disperse systems has been investigated using an annular shear cell and numerical simulations by the distinct element method (DEM).

TL;DR: In this paper, an extension of the X-ray micro-tomography methodology is presented to enable the characterization of a model agglomerate structure, which can be used in the validation and utilization of distinct element method simulations.

TL;DR: In this paper, a photo-bioreactorsystem in which a photocatalysis in a light stage is separated from a biocatalysis of a dark stage is proposed for an artificial photosynthesis system with a high selectivity of products through the use of light energy without denaturation of enzyme due to light irradiation.

TL;DR: In this paper, the authors investigated the mechanism and effects of experimental factors on the particle size distribution and particle morphology of synthesized precipitated CaCO3 in the carbonation process in which Ca CO3 is formed by blowing rate of CO2 gas into lime milk.

TL;DR: In this article, the interaction forces between tip mica and silica-mica surfaces in DMSO solutions were measured using atomic force microscopy (AFM) to investigate the detailed structure of adsorbed layers on surfaces.

TL;DR: In this paper, the influence of moisture content on the convection motion of wet granular materials in a vibrated bed was investigated, and it was found that the moisture content in the bed influenced the rising velocity of the larger bead.

TL;DR: In this paper, the authors optimized the value of the ratio of the fluidization velocity to the minimum fluidisation velocity, u/u mf, required to obtain the maximum wall-to-bed heat transfer conditions in a bed of fluidized particles heated by an external steam jacket.

TL;DR: In this article, single-particle breakage tests of South Blackwater and Ensham coal were conducted by using a computer-monitored twin-pendulum device to determine a parameter which will describe the product size distribution of the breakage product.

TL;DR: In this article, the authors investigated the flow patterns and stresses on the wall in a two-dimensional bin-hopper with the placement of an equilateral triangle flow corrective insert.

TL;DR: In this paper, a semi-empirical model was developed to predict particulate collection efficiency in low-to-high temperature gas cyclone separators using rice husk as feedstock, where devolatilization is the major contributor to gasification of the feedstock.

TL;DR: In this paper, a new processing concept for net-shaped nanoparticulate materials such as the two processing routes of the intrinsic and extrinsic type is introduced; the intrinsic type process is for processing bulk nanostructured alloy and composites that have the same composition as the nanopowder (Fe-Ni), and the extinsic one is for the nanoparticle dispersed ceramic composite materials (Al 2 O 3 -Ni).

TL;DR: In this paper, a number of developments in the industry are discussed, and real problems used to illustrate the need for basic scientific understanding to resolve them, and to move forward to more challenging processing and novel products, in an area of science which is truly interdisciplinary.