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  • Articles  (29)
  • Industrial Chemistry and Chemical Engineering  (29)
  • Wiley-Blackwell  (29)
  • Elsevier
  • Nature Publishing Group
  • Springer Nature
  • 1980-1984  (29)
  • 1975-1979
  • 1970-1974
  • 1984  (29)
  • 1970
  • Process Engineering, Biotechnology, Nutrition Technology  (29)
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  • Articles  (29)
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  • Wiley-Blackwell  (29)
  • Elsevier
  • Nature Publishing Group
  • Springer Nature
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  • 1980-1984  (29)
  • 1975-1979
  • 1970-1974
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  • 1984  (29)
  • 1970
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  • 1
    Electronic Resource
    Electronic Resource
    Calculation of the Electrical Field within an Electrical Sensing Zone Counter (1984)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 1 (1984), S. 37-43 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Iterative numerical analysis methods, similar to those used for ray tracing in electron and ion guns, have been employed to calculate the electrical potential distribution in the vicinity of the orifice of an electrical sensing zone (esz) instrument. In particular, the electrical potential across the mouth of the orifice is considered and the effects of numerically bevelling the sharp peripheral edge are demonstrated.The results support the empirical equation: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm d}\phi {\rm /d}x \sim 1 + \alpha '\{(r/R)/(1 - r/R)\} ^{\beta '} $$\end{document} for the axial component of the potential gradient, dφ/dx, at the mouth of the orifice expressed as a function of the radial distance, r, from the centre of the orifice of radius R; α′ and β′ are empirical constants. This equation was derived from previously reported experimental data on relative shifts and heights of artefact peaks apparent on the coarse side of size distributions measured via the esz method on a series of latex copolymers.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19840010107
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  • 2
    Electronic Resource
    Electronic Resource
    The Influence of Particle Shape and Particle Size Distribution on fluidisation behaviour of granular activated carbon in the aqueous phase (1984)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 1 (1984), S. 143-152 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper deals with the influence of particle shape and particle size distribution on the fluidisation behaviour of granular activated carbon in the aqueous phase. Methods for relating the degree of expansion, as a function of liquid velocity, to particle shape and particle size distribution are discussed and tested. Two different types of activated carbon, both containing irregularly shaped particles but with differences in shape, are used to test the models discussed. A tentative method which takes into account the influence of water temperature on fluidisation behaviour is proposed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19840010125
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  • 3
    Electronic Resource
    Electronic Resource
    Minimum Sintering Temperatures of Fluidizable Particles (1984)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 1 (1984), S. 171-177 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Experimental methods to determine minimum sintering temperatures of a variety of granules such as polymers, glass, coal, inorganic salts, etc. are presented. These methods include the use of a dilatometer in which the contraction-dilation characteristics of a small sample is measured, a differential scanning calorimeter test and an Instron machine by which yield strengths are measured. It is clearly shown that for the majority of materials studied, the different methods give similar values for the minimum sintering temperature but that the dilatometer experiment is the simplest as well as the most reliable method. Since the minimum sintering temperature is always less than the solid's melting point, an efficient method of measuring this temperature is very important for all fluidizable granules subjected to high temperatures. The danger of agglomeration during fluidization increases tremendously at temperatures higher than minimum sintering and therefore special precautions must be taken to avoid defluidization under these conditions.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19840010129
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  • 4
    Electronic Resource
    Electronic Resource
    Multifractal Description of a Rugged Fineparticle Profile (1984)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 1 (1984), S. 14-21 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Mandelbrot has extended the concept of classical dimensional description of physical systems to include fractional values which describe the ruggedness of a structure. Thus if one has a dimension of 1.2 one knows that one is dealing with a line which fills space more efficiently than a line which has dimension of 1.1. A mathematical curve which exhibits ideal fractal structure has the same appearance when viewed at any level of scrutiny. Kaye and co-workers applied the concept of fractal mathematics to the description of the boundaries of fineparticle profiles. As demonstrated in this communication a natural fractal boundary in contrast with an ideal fractal can exhibit different fractal structures over different ranges of scrutiny. As a consequence one should always report the scale of scrutiny employed when examining the fractal structure of natural boundaries. Data is presented demonstrating the fractal/euclidean boundary structure manifest by aluminum shot fineparticles examined at various levels of scrutiny. The relationship between fractal descriptors of fineparticle boundaries and the Fourier analysis of geometric signature waveforms for describing the structure of fineparticles is explored. Data presented by Flook on the physical significance of the various co-efficients of a Fourier analysis of a signature waveform is correlated with the fractal description of the ruggedness of a profile.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19840010103
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  • 5
    Electronic Resource
    Electronic Resource
    Comparison of Techniques for Measuring the Size of Fine non-spherical particles (1984)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 1 (1984), S. 45-52 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Three general types of commercial particle sizing instruments have been tested with redispersed fly ash and devolatilised coal char in the size range 0.5 to 5 μm. Results are compared with volume-equivalent diameters obtained by Coulter Counter. Single-particle light-scattering counters are found to oversize fly ash, primarily because of the irregular particle shape, but generally to undersize the strongly absorbing char particles. The Malvern sizer, based on Fraunhofer diffraction analysis, grossly oversizes fly ash dispersed in water, probably because most of the particles are too small for the Fraunhofer approximation to be valid; results for carbon char are closer to the expected values, although results for particles dispersed in air and in water show some disagreement. The Aerodynamic Particle Sizer undersizes irregular particles substantially, probably because of increased drag resulting from the irregular shape and tumbling motion of these particles.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19840010108
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  • 6
    Electronic Resource
    Electronic Resource
    Electrochemical Properties of Constituent Minerals of Manganese Nodules (1984)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 1 (1984), S. 137-142 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Deep-sea manganese nodules must be potentially valuable one of the most mineral resources containing several economically valuable metal elements. Manganese minerals in the nodules are regarded principally as todorokite and δ-MnO2. The todorokite phase is porous and enriched in copper and nickel, while the porous δ-MnO2 phase is enriched in cobalt. Porosity and adsorption as well as dissolution characteristics have been observed for each constituent mineral. Furthermore the pore diffusion coefficient has been calculated. Moreover, the zeta potential of each constituent mineral has been measured in order to evaluate the electrochemical property. This has been applied successfully to the selective concentration of copper and nickel bearing or cobalt bearing minerals in deep-sea manganese nodules.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19840010124
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  • 7
    Electronic Resource
    Electronic Resource
    Laser Diffraction Spectrometers/Experience in Particle Size Analysis (1984)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 1 (1984), S. 153-160 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Over the past few years, laser diffraction spectrometry has become a very important method of particle size analysis. Typical features include the large measuring range, the simplicity of operation and the speed with which analyses can be carried out. The principle of measurement and the set-up of three commerical instruments are described.The following points are discussed, with reference to examples:-Relevant parameters, such as particle shape, shape of distribution curve or dispersion, bution curve or dispersion,-reproducibility, comparison of the results obtained with different types of apparatus between one another and with other, analytical methods, and-on-line use of the instruments for the measurement of dynamic processes, eg. flocculation and dispersion processes.Operating experience gained with six instruments over a number of years is discussed.The measuring method which is described here is in a stage of rapid development and dissemination. It is for this reason that recent improvements and new developments cannot be dealt with here. For example, an apparatus named Helos from Sympatec GmbH, Remlingen, has appeared on the market. The external appearance of the instruments marketed by the Malvern and Leeds and Northrup companies has changed somewhat.The author's practical experience (in some instances extremely wide-ranging) with these devices is presented here in summary form.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19840010126
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  • 8
    Electronic Resource
    Electronic Resource
    Comminution of Irregularly Shaped Particles by Slow Compression: Interpretation of the size distributions of progeny particles as mixed distributions (1984)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 1 (1984), S. 74-77 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The evaluation of particle size distributions of comminution products often shows that the experimental distributions cannot be represented by one of the well-known functions (GGS, RRSB, log-normal distributions). Although in some cases a more or less satisfactory approximation to one of these functions can be made, a physically meaningful interpretation is generally impossible. Using the frequency curve, it can often be shown that mixed distributions, represented by several statistical assemblies, do exist. In this paper the progeny size distributions of quartzite formed by slow compression comminution of single grains and particle beds as well as of the comminution products of a roller mill are interpreted as superpositions of several statistical assemblies each of which can be represented by a truncated log-normal distribution.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19840010112
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  • 9
    Electronic Resource
    Electronic Resource
    Online Measurement of the Grain Size Distribution of Sand 0-4 mm used for the production of concrete (1984)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 1 (1984), S. 85-88 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An apparatus is described for the fast and automatic measurement of the grain size distribution of sand ranging from 0 to 4 mm. A sample of sand continuously introduced at a rate of 30 g/min is separated by the apparatus into seven fractions of 0-0.063, 0.063-0.125, 0.125-0.25, 0.25-0.5, 0.5-1, 1-2, and 2-4 mm. The amount of sand in each of these fractions is determined and the results are given in time intervals of 1 minute. The sand is separated in a separation chamber through which water streams in a horizontal laminar flow. The samples are separated according to their settling velocities. The four coarse fractions descend to the bottom of the chamber. They are collected and weighed under water. The three fine fractions remain suspended in three effluent water streams. The quantity of sand is measured in flow cells by absorption of laser light. Control of the system as well as the collection and processing of the measured data are done by means of an electronic control unit and a microcomputer.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19840010114
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  • 10
    Electronic Resource
    Electronic Resource
    Photometric Determination of Respirable Dust Concentration without Elutriation of coarse particles (1984)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 1 (1984), S. 96-101 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The principle of an instantaneous reading, respirable dust, photometer and its application are described. The instrument measures the infrared light (940 nm wavelength) scattered on airborne particles under a mean scattering angle of 70°. Its open measuring chamber, which is insensitive to daylight, is filled with total dust. The photometer reading, however, is calibrated in terms of mass concentration of respirable dust by means of a gravimetric respirable dust sampler. Experiments carried out with monodisperse test aerosols and with real dusts confirm the instrument's principle. The photometer values obtained for real dusts can be linearly converted into mass values of respirable dust as long as ultra-fine or ultra-coarse dusts are excluded. In several practical cases an increased flux of scattered light is compensated for by a higher density of the dust material.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19840010116
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