Tag Archives: image analysis

1966-1975 V. Chaloupková, T. Ivanova and A. Muntean
Particle size distribution analysis of pine sawdust: comparison of traditional oscillating screen method and photo-optical analysis
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Particle size distribution analysis of pine sawdust: comparison of traditional oscillating screen method and photo-optical analysis

V. Chaloupková, T. Ivanova* and A. Muntean

Czech University of Life Sciences Prague, Faculty of Tropical AgriSciences, Department of Sustainable Technologies, Kamýcká 129, CZ165 21 Prague, Czech Republic
*Correspondence: ivanova@ftz.czu.cz

Abstract:

Particle size and particle size distribution (PSD) are crucial parameters which affect properties of particulate and agglomerated materials, and have an impact on a quality and utilization of a final product. The aim of this paper was to determine PSD as well as to assess dimensional features of pine sawdust fractions via mechanical sieve analysis and photo-optical analysis. The first one is a traditional and standard method taking into account only one parameter of particle shape and the second one is a modern method based on a digital image processing that considers also irregular shapes of biomass particles. Pine sawdust was grinded into three fractions: 4, 8 and 12 mm and analysed using two mentioned methods. A horizontal vibrating sieve shaker comprising 11 sieves and a bottom pan was used, and the obtained data of retained particles on each sieve were evaluated. For comparison, a computerized photo-optical particle analyser was applied with max Feret’s diameter as a measurement algorithm for a particle length, and PSD was analyzed by grouping the particles according to their distinct lengths adjusted to the sieves’ sizes used in the screening method. Moreover, additional results in dimensions and parameters of PSD were obtained and evaluated through the photo-optical method. Pine sawdust particles can be described as non-uniform, mainly prolonged, finer particles dominated in all fraction samples. The study showed differences in the results, inaccuracy and other drawbacks of the conventional sieving method such as clogging and falling-through phenomena as well as the limitations of the machine vision. Strong sides of both methods were discussed, too. Overall, the results contributed to a better knowledge of the material properties and different methods of PSD analysis.

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492-499 J. Lev and J. Blahovec
Effect of I2/KI water solution to wheat seeds imbibition assessed by image analysis
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Effect of I2/KI water solution to wheat seeds imbibition assessed by image analysis

J. Lev* and J. Blahovec

Czech University of Life Sciences Prague, Faculty of Engineering, Department of Physics, Kamýcká 129, CZ165 21 Prague 6, Czech Republic
*Correspondence: jlev@tf.czu.cz

Abstract:

Water plays key role in a seed germination due to its participation in starting of many metabolic processes that accompany the seed germination. Rate of water uptake into seeds is a usual basis for determination of the three germination phases. The water uptake into seeds during their germination was investigated by many researchers who used various methods (e.g. magnetic resonance micro-imaging, near-infrared hyperspectral imaging and visualization with I2/KI solution (Lugol’s iodine)). The method of using I2/KI water solution for this purpose is quite popular for its relatively applicability. In this paper we compared the seed surface area projection and shape development of the seeds imbibed in the I2/KI solution and in the pure water via image analysis. It was found that the presence of the I2/KI in water changes the increase of seeds volume during germination and the effect is different during the initial imbibition and during the next germination phases. The seed shape development is similar for both variants, pure water and I2/KI solution.

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1548-1561 I. Černá, J. Pecen, T. Ivanova and Z. Piksa
The dependence of the durability of digestate briquettes and sorption properties on represented particle sizes
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The dependence of the durability of digestate briquettes and sorption properties on represented particle sizes

I. Černá, J. Pecen, T. Ivanova* and Z. Piksa

Czech University of Life Sciences Prague, Faculty of Tropical AgriSciences, Department of Sustainable Technologies, Kamýcká 129, CZ 16521 Prague 6, Czech Republic
*Correspondence: ivanova@ftz.czu.cz

Abstract:

Digestate, a product of the anaerobic digestion process, is traditionally used as liquid fertiliser. Besides agriculture use, it became possible to dry its separated solid part and compress it into briquette or pellet form. In the context of the characterisation of briquettes, the description here largely covers the mechanical properties of texture components and the distribution of particles within the briquette space. In order to define these properties and understand the relations between the mechanical part and any influencing factors, researchers started to identify the relationship between particles size distribution in briquettes and sorption properties and therefore mechanical properties. The objective of the present research was to compare size distribution in particles in different digestate samples and to study the connection to water sorption by briquettes and the durability of briquettes that have been made from two kinds of digestate material. For a comparison, two types of digestate were used, for which particles were split into a few size files according to the sieve size. By using digital image analysis, the dimensions of particles were specified and compared with values that were measured by means of a calliper. Sorption properties were defined through experimentation: exposing briquettes to a water source with water adsorption being determined via moisture content. Other mechanical properties were represented by toughness and the rate of abrasion. As result, digestate is an appropriate sorption matter which can multiply its initial mass by a factor of five if the water supply is sufficient. In the case of a dimension measurement of particles, digestate texture is represented by particles with one prevalent dimension, in most cases this being length. The length of particles was between approximately 1mm to 9mm. The digestate has been proven to be a good water sorbent material and can be applied in various sectors of agriculture.

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1351-1360 M. Kučera, Z. Aleš and M. Pexa
Detection and characterization of wear particles of universal tractor oil using a particles size analyzer
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Detection and characterization of wear particles of universal tractor oil using a particles size analyzer

M. Kučera¹*, Z. Aleš² and M. Pexa²

¹Technical University in Zvolen, Faculty of Faculty of Environmental and Manufacturing Technology, Department of Mechanics, Mechanical Engineering and Desing, Študentská 26, SK 96053, Zvolen, Slovak Republic
²Czech University of Life Sciences, Faculty of Engineering, Department of Quality and Dependability of Machines, Kamycka 129, CZ 16521, Praque 6, Czech Republic
*Correspondence: marian.kucera@tuzvo.sk

Abstract:

Oil contamination is the most common and serious source of machine failure. Therefore, lubrication oil testing and analysis is one of the most important condition monitoring (CM) techniques for machinery maintenance and failure diagnosis. Oil analysis consists of determination of physical-chemical properties, contamination and wear debris analysis (WDA). One of the modern methods how to detect wear particles is LaserNet Fines (LNF). The technology is an extension of effective laboratory microscope analysis and was developed specifically to address the shortfalls of monitors that measure only particle size or elemental concentration. Universal tractor oil (UTTO) is the multipurpose oil for the lubrication of the transmission, rear axle, differential, wet brakes, and hydraulic system fed by the common oil reservoir.

The aim of this work is detection and characterization of friction particles during lifetime of two different universal tractor transmission oils samples with using of laser particle counter LaserNet Fines-C and their comparing, synthetic ester-based UTTO oil and mineral-based UTTO oil.

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