Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "size particle distribution" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-25 z 83
Tytuł:
Application of the Tikhonov and the modified Twomey methods to calculate narrow microparticle size distributions by the laser diffraction technique
Autorzy:
Pawlata, Andrzej
Bartosewicz, Bartosz
Powiązania:
https://bibliotekanauki.pl/articles/2204155.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
laser diffraction
Mie scatter
size particle distribution
Tikhonov regularization method
modified Twomey method
Opis:
New ways of calculating narrow microparticle size distributions based on using the Tikhonov and the modified Twomey methods for the laser diffraction technique are presented. These allow to have reduced the broadening (over-smoothing) of the result occurring in these methods for narrow distributions both singular and their sum. The calculated singular distributions and their distribution sum were then approximated by a Gaussian function and a bimodal Gaussian function, respectively, using the Levenberg- Marquardt method. The angular distribution of scattering power was measured for polystyrene particles with radii of 0.676 μm and 1.573 μm, and for their sum. The tests were carried out for linearly polarized He-Ne laser light scattered by a dilute aqueous suspension of these particles. The results obtained were compared with those obtained with the nanoDS instrument (CILAS). It turned out that using the way based on the Twomey method, the parameters of the narrow distribution sought could be determined quite well.
Źródło:
Opto-Electronics Review; 2023, 31, 1; art. no. e145497
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrasonic Properties of Magnetic Nanoparticles with an Additional Biocompatible Dextrane Layer
Autorzy:
Dąbek, L.
Hornowski, T.
Józefczak, A.
Skumiel, A.
Powiązania:
https://bibliotekanauki.pl/articles/176605.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnetic nanoparticles
ultrasound
particle size distribution
Opis:
The temperature dependence of the particle size distribution (PSD) of the magnetic fluid with an additional biocompatible dextran layer was studied using a ultrasonic method. The measurements of the ultrasound velocity and attenuation were carried out as a function of the volume concentration of magnetite particles at temperatures ranging from 15°C to 40°C. In order to extract the PSD from ultrasonic measurements, the theoretical model of Vinogradov-Isakovich was used. The extraction of PSD from the ultrasonic data requires also the measurements the density and viscosity of the ferrofluid samples. The calculated PSD of the magnetic fluid with an additional biocompatible layer shows a greater thermal stability than that of a magnetic fluid with a single surfactant layer.
Źródło:
Archives of Acoustics; 2013, 38, 1; 93-98
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of operating pressure and stand-off distance on coal comminution by waterjet
Autorzy:
Li, Y.
Galecki, G.
Şen, G. A.
Şen, S.
Powiązania:
https://bibliotekanauki.pl/articles/110840.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coal
waterjet
comminution
particle size distribution
Opis:
Comminution of coal to ultrafine sizes by high-pressure waterjet coupled with cavitation cell provides a novel method for preparation of coal-water fuels for next generation, near-zero emission electric power generation. To establish the fundamental performance of the waterjet mill, the effects of the operating pressure and stand-off distance were comprehensively investigated using a high ash bituminous coal. The comminution products were evaluated in terms of the particle size, particle size distribution, and surface area change. The experimental results indicated that the waterjet-mediated comminution of coal was strongly affected by all these operating parameters. Higher operating pressure led to finer products, while the efficiency of the waterjet mill in terms of particle size strongly depended on the stand-off distance. This research provides a deeper insight into the high-pressure waterjet for coal comminution and a basis for process parameter optimization.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 394-401
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the sand particle shape on particle size distribution measured by laser diffraction method
Autorzy:
Polakowski, C.
Sochan, A.
Bieganowski, A.
Ryzak, M.
Foldenyi, R.
Toth, J.
Powiązania:
https://bibliotekanauki.pl/articles/25877.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
sand
particle shape
particle size distribution
laser diffraction
Opis:
The aim of this paper was to show how the shape of sand particles affects the results of particle size distribution obtained by the laser diffraction method. On the basis of the results obtained one can conclude: the shape of the investigated particles influences particle size distribution obtained by the laser diffraction method. This phenomenon occurs in the sand fraction, as shown in our investigation. The importance of this effect depends on the type of the measured material and on the aim of the investigations. For most researchers in soil science and sedimentology who investigate sand fractions, this impact can be negligible. Further investigations with other soil and sediment fractions are needed.
Źródło:
International Agrophysics; 2014, 28, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on the Tailoring of Particle Size and Micromeritic Properties of Reduced Shock Sensitivity RDX (RSS-RDX)
Autorzy:
Ramavat, V.
Sarangapani, R.
Reddy, S. T.
Patil, R. S.
Gore, G. M.
Sikder, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/951500.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
crystallization
RSS-RDX
micromeritics
particle size distribution
Opis:
The microstructure of explosive particles, as well as formulations, has a significant influence on the shock sensitivity of various energetic formulations. Particle shape and specific size distributions are always important considerations in explosives processing in order to realize better process parameters. The present study aimed to explore crystallization variables required to achieve a specific particle size of Reduced Shock Sensitivity RDX (RSS-RDX). Crystallization process factors such as cooling rate, agitator speed and configuration, etc. have been systematically studied to understand their effect on the particle size. The study also established the crystallization process parameters required to tightly control a specific particle size distribution ranging from 50 to 500 μm by cooling crystallization. Fine particles ranging from 15 to 30 μm were prepared by an ultrasonication technique. Ultrasonic process parameters, including temperature, time and ultrasonic frequency, were studied and the process conditions were optimized. Micromeritic characterization of RSS-RDX revealed the nature of flowability, which in-turn is useful in identifying the ease of processability. Overall, our interest stemmed from an investigation which showed that careful optimization of crystallization variables can lead to a specific particle size distribution.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 4; 581-592
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical models of particle size distribution in simulation analysis of high-pressure grinding roll operations
Autorzy:
Saramak, D.
Powiązania:
https://bibliotekanauki.pl/articles/110253.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
HPGR
comminution
particle size distribution
ore processing
Opis:
The high-pressure grinding roll (HPGR) technology is currently one of the most efficient methods of hard ore comminution from the scope of the energy consumption. Throughput and energetic models of performance are quite well developed, but technological models predicting the comminution effects still needs an in-depth research. In the paper author presents the method of modeling of HPGR products’ particle size distribution by using suitable mathematical models. A basis of the HPGR perfor-mance assessment and HPGR-based crushing circuits design is a product’s particle size distribution. In order to precisely determine the particle size distribution of a HPGR product, parameters of product’s particle size distributions should be conditional on the main technical parameters of the roller press like operating pressure and the speed of rolls. The most accurate approximation of a distribution of size parti-cle appears to be Weibull’s truncated distribution and it is possible to obtain significant relationships between the approximation formula and the value of operating pressure, or feed characteristics. It makes possible a determination of mass recoveries of the product’s respective size fractions and the productivity planning. Instead of pressure, the other HPGR operating parameters can be applied, but the pressure value appears to produce the most relevant relationship. A determination of HPGR product’s particle size dis-tribution is a basis of the press operation simulation analysis.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 1; 121-131
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of selected properties of rhenium sulphide dispersion
Autorzy:
Pawlak, D. W.
Parus, J. L.
Skwarek, E.
Janusz, W.
Powiązania:
https://bibliotekanauki.pl/articles/951830.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
rhenium sulphide
particle size distribution
zeta potential
Opis:
Due to potential application of rhenium sulphide in medicine and industry, this study is focused on the properties of synthetic and commercial rhenium sulphide. The main reaction of rhenium sulphide preparation involves potassium perrhenate and sodium thiosulphate in the acidic environment giving a mixture of rhenium sulphide and sulphur. The next step is removing sulphur by its dissolution in ether. Stabilization by Povidone K-25 is needed to obtain rhenium sulphide dispersed with the grain size of 0.5–4 m. The extrapolated value of pHiep for synthesised rhenium sulphide is 2.3 whereas for commercial samples this value is lower than 2. For synthetic sample a dependence of zeta potential on the carrier electrolyte concentration is found. It is larger than that for the commercial sample, probably due to surface oxidation during synthesis or purification.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 1; 387-397
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolution of droplet size distribution in selected nebulizers
Autorzy:
Dobrowolska, Katarzyna
Sosnowski, Tomasz R.
Powiązania:
https://bibliotekanauki.pl/articles/1450682.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
spraying
liquid atomization
aerosol dynamics
particle size distribution
Opis:
Nebulizers are the class of atomizing devices used to disperse liquids to fine droplets. They found their application in selected technological (typically: small-scale) processes, but their most common use is related to the generation of medicinal aerosols for inhalation. In this work we present the experimental data on the evolution of the size distributions of water droplets generated by two nebulizers (pneumatic and vibrating-mesh) as a result of aerosol mixing with the ambient air. Such a process reflects the real situation, where aerosol emitted from a nebulizer is diluted by additional air sucked by a patient during inhalation. Droplet size distribution was determined by laser diffraction, and these results were further discussed including the data of the aerosol velocity measured by the Laser Doppler Anemometry (LDA). It was demonstrated – as expected - that dilution with the ambient air with moderate humidity results in the intense evaporation of the smallest droplets. However, larger droplet may be saved to a different degree depending on the velocity and geometry of the aerosol cloud emitted from the nebulizer, and on the volume of the diluting air. These parameters have an influence on the droplet coalescence which is another process shaping the droplet size distribution in the studied conditions. The results can deepen the understanding of the mist dynamics which can be applied in various fields of colloidal science and technology.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 6; 32-40
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of two-stage thermal disintegration on particle size distribution in sewage sludge
Autorzy:
Kaczmarek, A. M.
Gaca, J.
Powiązania:
https://bibliotekanauki.pl/articles/777862.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
laser diffraction
particle size distribution
sludge
thermal hydrolysis
Opis:
The effect of two-stage thermal disintegration of sewage sludge on the particle size distribution using laser diffraction method has been studied. The sludge was sampled from municipal sewage treatment plant after each stage of disintegration. The first stage of disintegration known as homogenization proceeds at temperature of 70-90°C and pressure of 3 bar, the second stage called thermal hydrolysis was performed at temperature of 160-170°C and pressure of 6 bar. It was found that the first stage of disintegration has the strongest impact on the reduction of the sludge particle size and changes in chemical properties. The maximum size of the particles from raw sewage before disintegration was 310 μm. After first stage of the process average size of the particles was 250 μm, and during the second stage it was reduced to 226 μm. Sludge disintegration degree (DDCOD) of 59% confirms high effectiveness of the process. We established that the redox potential (Eh) of sludge effluents was changed after each step of the studied process. Furthermore, chemical oxygen demand (COD) increases which leads to the conclusion that resizing of floccules is accompanied by hydrolysis.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 3; 69-73
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of aluminosilicate-supported nickel and iron oxides nanocomposites in gaseous and aqueous media
Autorzy:
Goncharuk, Olena
Dyachenko, Alla
Skwarek, Ewa
Ischenko, Olena
Andriyko, Lyudmila
Borysenko, Mykola
Sulym, Iryna
Sternik, Dariusz
Kowalska, Klaudia
Marynin, Andrii
Powiązania:
https://bibliotekanauki.pl/articles/2146949.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
oxide nanocomposites
NiO/FexOy
textural properties
particle size distribution
Opis:
A series of mixed oxides was synthesized by deposition of a guest phase on a highly dispersed oxide matrix. Fumed nanooxides SiO2, Al2O3, SiO2/Al2O3, and SiO2/Al2O3/TiO2 with the specific surface area of 65-91 m2/g were selected as highly dispersed matrices. NiO/FexOy was deposited as a guest oxide using solvate-stimulated modification of a surface of fumed nanocarriers with nickel nitrate and iron(III) formate and subsequent heat treatment up to 600 °C to form NiO/FexOy. The aim of this work was to study the influence of the composition and structure of fumed oxide matrices and deposited guest phase on the behavior of the composites in gaseous and aqueous media using XRD, nitrogen adsorption and SEM/EDX, and quasi-elastic light scattering (QELS) methods. The lowtemperature nitrogen adsorption isotherms have a sigmoid shape with a narrow hysteresis loop characteristic of mesoporous materials. The specific surface area of composites varies from 65 to 120 m2/g. SEM data show denser aggregate structure of nanocomposites compared to the initial carriers. The primary particle size was in the 30-60 nm range. According to QELS data, there is a tendency to form aggregates of 100 nm - 10 µm in size in the aqueous media. The XRD method shows that the deposited metal oxides are in the form of crystalline phases of NiO with crystallites of 7-23 nm in size, but the iron oxide reflexes were not identified for NiO-containing composites.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 2; art. no. 144375
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of soil texture determination using soil fraction data resulting from laser diffraction method
Autorzy:
Mako, A.
Szabo, B.
Rajkai, K.
Szabo, J.
Bakacsi, Z.
Labancz, V.
Hernadi, H.
Barna, G.
Powiązania:
https://bibliotekanauki.pl/articles/2082643.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
laser diffraction
particle-size distribution
pedotransfer function
soil texture triangle
Opis:
There are global aspirations to harmonize soil particle- size distribution data measured by the laser diffraction method and by traditional sedimentation techniques, e.g. sieve-pipette methods. The need has arisen therefore to build up a database, containing particle-size distribution values measured by the sieving and pipette method according to the Hungarian standard (sieve-pipette methods-MSZ) and the laser diffraction method according to a widespread and widely used procedure. In our current publication, 155 soil samples measured with sieve-pipette methods-MSZ and laser diffraction method (Malvern Mastersizer 2000, HydroG dispersion unit) were compared. Through the application of the usual size limits at the laser diffraction method, the clay fraction was under- and the silt fraction was overestimated compared to the sieve-pipette methods-MSZ results, and subsequently the soil texture classes were determined according to the results of both methods also differed significantly from each other. Based on our previous experience, the extension of the upper size limit of the clay fraction from 2 to 7 μm increases the comparability of sievepipette methods-MSZ and laser diffraction method, in this way the texture classes derived from the particle-size distributions were also more in accordance with each other. The difference between the results of the two kinds of particle-size distribution measurement methods could be further reduced with the pedotransfer functions presented.
Źródło:
International Agrophysics; 2019, 33, 4; 445-454
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction and Characterization of Silicon Dioxide from Volcanic Ash of Mount Sinabung, Indonesia: A Preliminary Study
Autorzy:
Hasanah, Moraida
Sembiring, Timbangen
Sitorus, Zuriah
Humaidi, Syahrul
Zebua, Fynnisa
Rahmadsyah
Powiązania:
https://bibliotekanauki.pl/articles/2068469.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
volcanic ash
characterization
electron microscopy
Mount Sinabung
particle size distribution
Opis:
The study was conducted on the extraction of volcanic ash from Mount Sinabung through the co-precipitation method to recover silicon dioxide (SiO2). The X-ray fluorescence (XRF) analysis showed that the SiO2 content in volcanic ash was 48.5%, and after extraction, it was 99.1%. The morphology shown by scanning electron microscope (SEM) indicated that SiO2 looks cleaner and tends to be the same size compared to the volcanic ash sample. The average particle size of volcanic ash and extracted SiO2 were 32.28571 ± 2.51259 and 12.97521 ± 0.60657 μm, respectively. The X-ray diffractometer (XRD) analysis showed that the crystal structure of the volcanic ash sample was quartz, maghemite, and cristobalite. Besides, the extracted SiO2 had an amorphous quartz crystal structure. The test conducted using Fourier transform infrared (FTIR) resulted in the absorption of 1095.57 cm-1 and 798.53 cm-1 for the Si‒O‒Si and Si‒OH groups which were the groups of siloxanes and silanols, respectively.
Źródło:
Journal of Ecological Engineering; 2022, 23, 3; 130--136
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Portland-composite cements with zeolite tuff
Autorzy:
Kropyvnytska, T.
Sanytsky, M.
Geviuk, I.
Powiązania:
https://bibliotekanauki.pl/articles/104269.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
Portland-composite cement
zeolite tuff
particle size distribution
compressive strength
properties
Opis:
Growing requirements for protection of the environment every year gradually increase production of cements with a high content of mineral additives and clinker cements should be considered as cements for special purposes. The strong development of a quaternary Portland cement composite system containing blast-furnace slag, zeolite tuff and limestone powder is presented. The composition and particle size distribution of the constituents are optimized by the incremental coefficient of the surface activity of the zeolite-containing Portland composite cements. Zeolite tuff and limestone powder of high specific surface area lead to the increase of the surface activity of the entire system and a corresponding improvement in the performance of the cement. It was shown that low-energy Portland-composite cements “green cements” obtained by separate grinding are characterized by higher early compressive strength. The optimization of Portland-composite cements was carried out and the relationship between the phase composition, microstructure and strength of the cement matrix were investigated. The main role of zeolite is to improve the properties of cement stone by reducing the quantity and size of hydrate calcium hydroxide with increasing of low alkali calcium hydrosilicates. It is shown that a synergistic combination of mineral additives of different groups with substantial reduction of high energy-consumption clinker component in the Portland-composite cements allows to improve rheological properties and provides of strength increase of binder.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 3; 25-34
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody stereowizyjne w analizie składu ziarnowego
Stereovision methods in granulometric analysis
Autorzy:
Heyduk, A.
Powiązania:
https://bibliotekanauki.pl/articles/113227.pdf
Data publikacji:
2017
Wydawca:
STE GROUP
Tematy:
stereowizja
analiza obrazu
skład ziarnowy
stereovision
image analysis
particle size distribution
Opis:
Stereowizja jest jednym ze sposobów akwizycji obrazów trójwymiarowych, opartym na naśladownictwie funkcjonowania ludzkiego układu wzrokowego. W artykule przedstawiono podstawowe zasady stereowizji oraz koncepcję zastosowania tej metody do analizy powierzchniowej warstwy strumienia materiału ziarnistego na ruchomej taśmie przenośnika. Dzięki wykorzystaniu ruchu taśmy możliwa jest realizacja prostego układu stereowizyjnego z wykorzystaniem tylko jednej kamery o wysokiej rozdzielczości, wykonującej zdjęcia w krótkim odstępie czasu. Przedstawiono wyniki wstępnych badań przeprowadzonych na stanowisku laboratoryjnym. Przeanalizowano zalety i wady metod stereowizyjnych w porównaniu z innymi sposobami akwizycji obrazów trójwymiarowych. Podstawową zaletą jest mała złożoność sprzętowa i stosunkowo niski koszt oraz wysoka rozdzielczość uzyskiwanych obrazów, natomiast podstawową wadą – wysoka złożoność obliczeniowa w przypadku obrazów obejmujących dużą liczbę ziarn (drobne sortymenty), związana z koniecznością identyfikacji odpowiadających sobie punktów w sekwencji dwóch kolejnych obrazów .
Stereovision is a way of three-dimensional image acquisition based on the imitating the operation of the human visual system. The article discusses basic stereovision principles and the concept of application of this method to the granulometric analysis of the surface layer of a particulate material stream on a moving conveyor belt. Through the use of of the belt movement it is possible to design a simple stereovision system with a single high resolution camera, recording two pictures within a short time interval. There have been presented some results of preliminary tests performed on a laboratory stand. There have been also described the advantages and disadvantages of stereovision methods compared with other types of three-dimensional images acquisition methods. The main advantage is a low hardware complexity, relatively low cost and high resolution of recorded images, but the main drawback - high computational complexity for images involving a large number of particles (fine granulometric classes), associated with the need to identify the corresponding points in the sequence of two successive images.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2017, 6, 2; 103-113
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Agroecological assessment of agricultural soils fertility in the Iglinsky region, the Russian Federation
Autorzy:
Kiseleva, Anna
Asylbaev, Ilgiz
Mirsayapov, Ramil
Kurmasheva, Nadezhda
Powiązania:
https://bibliotekanauki.pl/articles/2174353.pdf
Data publikacji:
2022
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
digital map
humus
morphological properties
particle size distribution
phosphorus
soil fertility
Opis:
The article provides an assessment of soil fertility indicators of agricultural lands in the northern forest-steppe of the Republic of Bashkortostan within the Iglinsky region (Russian Federation). The content of humus, mobile phosphorus, exchangeable potassium, the thickness of the humus horizon, granulometric composition, morphological properties and soil washout were studied. It was revealed that the soil-forming process occurs on rocks of different ages and genesis, such as diluvial carbonate and carbonate-free clays and heavy loams, limestone eluvium, sandstone eluvium and alluvial deposits, which determine the diversity of the soil cover. In the study area, water erosion processes are developing, influenced by anthropogenic and natural factors such as planar and linear washout on slopes with a steepness of more than 2-3° and high ploughing of agricultural land. In terms of humus content, low-humus and medium-humus soils are widespread, accounting for 45.5 and 40%, respectively. The soil map was corrected and digitised to identify the main types and subtypes of soils, indicating the varieties at a scale of 1: 25,000. Digitised maps, taking into account the current state of soil fertility, are used to develop projects for inter-farm and intra-farm land management of organisations of the agro-industrial complex, state cadastral valuation of agricultural land, determination of land tax and development of measures to improve soil fertility.
Źródło:
Journal of Water and Land Development; 2022, 55; 200--205
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental factors influence milling and physical properties and flour size distribution of organic spelt wheat
Autorzy:
Warechowska, M.
Warechowski, J.
Skibniewska, K. A.
Siemianowska, E.
Tyburski, J.
Aljewicz, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/298457.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
organic spelt
physical properties
mechanical properties
milling
particle size distribution
PSD
Opis:
Spelt grain harvested at four organic farms in Poland were assessed for physical and milling properties and flour size distribution. The spelt grain was diversified in relation to the majority of tested milling quality parameters. The environmental conditions had a significant impact on thousand kernel weight, vitreousness, PSI, kernel ash content, specific energy of milling and the particle size distribution of flour. The values of specific energy of milling, coefficient of grinding efficiency, rupture force and rupture energy in the spelt from the organic farms were significantly lower than common wheat. The highest spelt flour yield was obtained of kernels cultivated on ecological farm with semi-coherent and very dry soil was similar to that of common wheat; the milling yield of the spelt originating from other farms was by 9.5% to 12.7% less than from the wheat one. The greatest differences in PSD between the tested flours were detected for the values over 40 μm. The content of this fraction was determined in the range of app. 1% to almost 4.5%; the flour from common wheat contained app. 2.8% of this fraction.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(4); 387-399
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Możliwości poprawy dokładności aproksymacji krzywych składu materiałów uziarnionych
Possibilities of adjusting the adequacy of grained materials particle size distribution approximation
Autorzy:
Foszcz, D.
Saramak, D.
Tumidajski, T.
Niedoba, T.
Gawenda, T.
Powiązania:
https://bibliotekanauki.pl/articles/349276.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
aproksymacja
analiza statystyczna
skład ziarnowy
approximation
statistical analysis
particle size distribution
Opis:
Dokładność matematycznego opisu krzywych składu materiałów uziarnionych jest bardzo istotna w przeróbce kopalin. W artykule opisano różne statystyczne podejścia do tego zagadnienia, wskazując na ich zalety i wady podejść. Dla przykładowych składów ziarnowych użyto nie tylko znane równania GSA czy Weibulla, ale też inne. Wykazano ważność doboru w tych równaniach maksymalnego rozmiaru ziarna, które podczas rutynowych analiz sitowych jest trudne do określenia i prowadzi do stosowania tzw. rozkładów cenzurowanych. W pracy zastosowano także tzw. nieparametryczne metody opisu krzywych składu ziarnowego za pomocą szeregów Fouriera oraz funkcji jądrowych. Zastosowanie ich daje zazwyczaj lepszą dokładność matematycznego opisu krzywych składu ziarnowego, ale nie mogą być one podstawą interpretacji technologicznej. Ponadto w pracy przeprowadzono aproksymację krzywych składu ziarnowego metodą najmniejszych kwadratów z użyciem wag dla wychodów poszczególnych klas ziarnowych w próbce. Najlepsze wyniki aproksymacji uzyskano dla rozkładu logistycznego.
The approximation adequacy of particle size distribution curves for various grained materials is very significant in many industrial processing investigations. The authors propose in the paper various approaches to this issue, indicating advantages and disadvantages of classical and non-classical statistical analyzes. On the basis of selected results of particle size distributions of certain grained material, the classical forms of approximated formulas were presented, i.e. GSA, Weibull and log-norm distribution functions. It was indicated that the acceptance of proper maximum particle size is difficult to determine and leads to application of the so-called censored distribution functions. Furthermore, the non-parametrical methods of approximation were applied, such as orthogonal Fourier series and kernel methods. Their application results usually in better adequacy of approximation, but they cannot be the basis for technological interpretation. Furthermore, the approximation by the least squared method was performed with application of weights. The best approximation results were obtained for the logistic distribution function.
Źródło:
Górnictwo i Geoinżynieria; 2010, 34, 4/1; 37-47
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza oddziaływania wybranych parametrów na proces rozdrabniania materiału ziarnistego
Influence of operational parameters on the grinding process of granular material
Autorzy:
Sowiak, J
Bilard, P
Przybył, A.
Kordas, M.
Rakoczy, R.
Powiązania:
https://bibliotekanauki.pl/articles/2072518.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mielenie
mieszalnik wstęgowy
skład ziarnowy
grinding
ribbon mixe
particle-size distribution
Opis:
mieszalniku wstęgowym. W badaniach użyto cząstek węgla aktywnego, a proces mielenia przeprowadzono dla wybranych prędkości obrotów mieszadła: 2; 50 oraz 100 obr min -1. Określono wpływ wybranych parametrów operacyjnych (prędkość obrotowa mieszadła, czas mielenia) na uzyskany skład ziarnowy produktu. Otrzymane wyniki umożliwiły ocenę efektywności prowadzonych prób mielenia.
Experimental results dealing with the grinding process of granular material in a ribbon mixer are presented. Activated carbon particles were used in the research. Milling process was performed for the selected stirrer rotational frequencies: 2, 50 and 100 rpm min-1. An influence of selected operational parameters (stirrer rotational frequency, grinding time) on the size distribution of granular material is presented. The results enabled the assessment of grinding test efficiency.
Źródło:
Inżynieria i Aparatura Chemiczna; 2013, 4; 370--371
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of laboratory conditions effect on prediction accuracy of size distribution of industrial ball mill discharge by using a perfect mixing model. A case study: Ozdogu copper-molybdenum plant
Autorzy:
Gharehgheshlagh, H. H.
Ergun, L.
Chehreghani, S.
Powiązania:
https://bibliotekanauki.pl/articles/110599.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ball mill scale-up
perfect mixing model
particle size distribution
simulation
Opis:
In this study, the perfect mixing model was used to investigate its accuracy level, under different laboratory conditions, in predicting the particle size distribution of industrial ball mills discharges. For this purpose, data sets of two laboratory ball mills with eight different compositions of balls and two industrial mills of a copper processing plant for seven different tonnages, which totally included 56 simulation operations, were used. For simulation, the necessary data were obtained through performing the breakage distribution function and kinetic grinding tests using laboratory mills. The results were used to determine the first order grinding kinetics and normalized breakage rate parameters. For the industrial scale, the simulation process was carried out using data, perfect mixing model equations and JKSimMet software. The results showed that the operating conditions of the laboratory mills were quite affected by the predictive power of the desired model. Comparing the measured and simulated values of P80, it is clear that 2 minutes of first order grinding using the Bond laboratory ball mill with standard operating conditions and single size ball load of 20 mm provided the best prediction with trivial errors, less than 10%, for all seven tonnages of the industrial mills. The results of this study together with more investigations on different plants can be helpful in optimization, simulation and scale-up procedures of ball mills.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1175-1187
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alternatywne metody określania udziału frakcji penetrującej do płuc (FPF) w aerozolach inhalacyjnych
Alternative methods for determination of fine particle fraction in inhalation aerosols
Autorzy:
Odziomek, M.
Sosnowski, T. R.
Powiązania:
https://bibliotekanauki.pl/articles/2070728.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
inhalator
impaktor
pomiar wielkości cząstek
aerozol
inhaler
impactor
particle size distribution
aerosol
Opis:
Porównano trzy metody pomiaru rozkładu wielkości cząstek aerozoli medycznych, służące wyznaczeniu udziału cząstek mniejszych od 5 μ (FPF) o największym znaczeniu leczniczym. Stwierdzono, że zarówno dla nebulizatora jak i inhalatora typu DPI, czasochłonne badania z użyciem 8-stopniowego impaktora kaskadowego mogą być częściowo zastąpione pomiarami z wykorzystaniom impaktora ze zmniejszoną liczbą stopni lub spektrometru aerozolowego.
Three methods of particle size determination in medical aerosols were compared in order to assess their usefulness for the estimation of fine particle fraction (FPF - particles smaller than 5 (μ. It was shown for a nebulizer and DPI that the time-consuming determination procedure with 8-stage cascade impactor can be, in some cases, replaced by using either the reduced 3-stage impactor or the aerosol spectrometer.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 5; 83-85
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of metal oxide-water nanofluids by the two-step method
Otrzymywanie nanopłynów tlenków metali w wodzie metodą dwustopniową
Autorzy:
Drzazga, M.
Lemanowicz, M.
Dzido, G.
Gierczycki, A.
Powiązania:
https://bibliotekanauki.pl/articles/2071742.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
nanopłyn
rozkład ziarnowy
potencjał zeta
nanofluid
particle size distribution
PSD
zeta potential
Opis:
Nanofluids, i.e. suspensions of nanoparticles in base fluid, may be prepared either by the one- or two-step method. In the one-step method nanoparticles are synthesized directly in base fluid. In the two-step method nanoparticles prepared as a powder are suspended in base fluid. Influence of sonication time, stabilizer and pH on stability, particle size distribution and zeta potential of CuO- and Al2O3-water nanofluids prepared by the two-step method is presented in the paper.
Nanopłyny, czyli zawiesiny nanocząstek w płynie bazowym, mogą być otrzymywane metodą jedno- i dwustopniową. W metodzie jednostopniowej nanocząstki otrzymuje się bezpośrednio w płynie bazowym. W metodzie dwustopniowej nanocząstki otrzymane w postaci proszku zawieszane są w płynie bazowym. Przedstawiono wpływ czasu nadźwiękawiania, rodzaju stabilizatora i pH na stabilność oraz rozkłady ziarnowe i potencjał zeta nanopłynów CuO i Al2O3 w wodzie otrzymanych metodą dwustopniową.
Źródło:
Inżynieria i Aparatura Chemiczna; 2012, 5; 213-215
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractal scaling of soil particles in agricultural landscapes of Nigerian savannas
Autorzy:
Salako, F.K.
Powiązania:
https://bibliotekanauki.pl/articles/26214.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil profile
fractal scaling
agricultural landscape
savannah
soil
particle size distribution
Nigeria
Źródło:
International Agrophysics; 2006, 20, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of large particle sizes using a machine vision system
Autorzy:
Zhang, Z.
Yang, J.
Su, X.
Ding, L.
Powiązania:
https://bibliotekanauki.pl/articles/109404.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
machine vision
particle size distribution
equivalent ellipse
best-fit rectangle
representing analysis
Opis:
Many methods based on machine vision were used to estimate coarse particles size distribution in recent years, but comparison of accuracy parameters representing particle size has not been carried out and a related representing analysis has not been yet proposed. Nine parameters were investigated. The results indicated the minor axis of equivalent ellipse and breadth of the best-fit rectangle were the most suitable for representing particle size. The former accuracy ratio was 86.43% and the latter accuracy ratio was 85.39%, while the accuracy of other parameters was less than 70%. A related representing analysis was proposed to explain this phenomenon. This research is instructive and meaningful for the size distribution estimation by machine vision.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 397-405
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of energies on the impact breakage characteristic of magnetite ores
Autorzy:
Si, Liang
Cao, Yijun
Li, Guosheng
Powiązania:
https://bibliotekanauki.pl/articles/2200336.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fractal dimension
ore breakage characteristic
particle size distribution
mineral liberation
fracture morphology
Opis:
The energy applied during breakage is the key to enhancing the magnetite liberation degree and improving quality. The relationship between energy and liberation properties remains unclear due to various complicated factors affecting mineral liberation. Therefore, this work aims to study the effect of energy on the breakage characteristics of magnetite ores; the impact breakage test was conducted on magnetite particle groups at different energies using a drop weight impact tester; the statistical analysis was performed based on the fractal theory to research the particle size distribution; the fracture morphology and liberation properties of these ores were analyzed using scanning electron microscope and mineral liberation analyzer. Results show that the particle size distribution of magnetite after breakage conforms to the fractal law. The larger the energy, the greater the fractal dimension for this distribution, showing a linear relation between them, which implies that the fractal dimension can evaluate the breakage degree. The fracture morphology of magnetite ores indicates that as the energy increases, the intergranular fracture evolves into transgranular fracture, proving the influence of energy on fracture modes. It is found that the magnetite liberation degree first increases and then decreases with the rising of energy, indicating that the magnetite liberation can be improved at an appropriate amount of energy. The above conclusions provide a theoretical reference for optimizing energy and improving broken product quality.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 1; art. no. 159098
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of the Crushed Ore Particles Density in the Pulp Flow Based on the Dynamic Effects of High-Energy Ultrasound
Autorzy:
Morkun, V.
Morkun, N.
Powiązania:
https://bibliotekanauki.pl/articles/176809.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
concentration
high-energy ultrasound
bulk-mode ultrasonic waves
particle size distribution
pulp characteristics
Opis:
The method of automatic measurement of the ore particles density in the pulp flow by measuring the amount of high-frequency volume ultrasonic oscillations attenuation, which have passed a fixed distance in the test medium under the influence of high-energy ultrasound dynamic effects is considered. The results of ultrasonic field parameters calculation and spatial simulation of high-energy ultrasound radiation pressure effect on the pulp flow, as well as the results of modeling the trajectory of ore particles displacement of three fractions in the pulp flow under the influence of high-energy ultrasound radiation pressure are presented.
Źródło:
Archives of Acoustics; 2018, 43, 1; 61-67
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 83

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies