Informacja

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

Wyszukujesz frazę "particle removal" wg kryterium: Wszystkie pola


Wyświetlanie 1-8 z 8
Tytuł:
Impact of temperature, bed height, and particle size on Ni(II) removal in a continuous system: Modelling the break curve
Autorzy:
Villabona-Ortíz, Ángel
Tejada-Tovar, Candelaria
Ortega-Toro, Rodrigo
Peña-Romero, Keily
Botello-Urbiñez, Ciro
Powiązania:
https://bibliotekanauki.pl/articles/2073755.pdf
Data publikacji:
2022
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
biosorption
Dose–Response model
packed bed
Thomas model
Opis:
The objective of this research was to evaluate the adsorption capacity of the shell biomass (Dioscorea rotundata), taking into account the impact of temperature, bed height, and particle size on the removal of nickel(II) ions in aqueous solution in a continuous fixed-bed column system; performing the modelling of the break curve. The biomass was characterised by SEM-EDS analysis. The analysis found that it represents a rough, heterogeneous structure, rich in carbon and oxygen, with mesopores, and is suitable for removing heavy metals. It also determined the optimum parameters of the bed height, particle size, and temperature, keeping the pH and the initial concentration of the solution constant. The results revealed that the bed height and the particle size are the two most influential variables in the process. Ni(II) removal efficiencies range between 85.8 and 98.43%. It was found that the optimal conditions to maximise the efficiency of the process are temperature of 70°C, 1.22 mm particle size, and 124 mm bed height. The break curve was evaluated by fitting the experimental data to the Thomas, Adams-Bohart, Dose-Response, and Yoon-Nelson models, with the Dose-Response model showing the best affinity with a coefficient of determination R2 of 0.9996. The results obtained in this research showed that yam shell could be suggested as an alternative for use in the removal of Ni(II) ions present in an aqueous solution in a continuous system.
Źródło:
Journal of Water and Land Development; 2022, 52; 257--264
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microphone Based Acoustic Vector Sensor for Direction Finding with Bias Removal
Autorzy:
Wajid, Mohd
Kumar, Arun
Bahl, Rajendar
Powiązania:
https://bibliotekanauki.pl/articles/2141636.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic measurements
acoustic sensor
acoustic vector sensor
direction-of-arrival estimation
finite element analysis
microphones
particle velocity
sound source localization
Opis:
The acoustic vector sensor (AVS) is used to measure the acoustic intensity, which gives the direction-of-arrival (DOA) of an acoustic source. However, while estimating the DOA from the measured acoustic intensity the finite microphone separation (d) in a practical AVS causes angular bias. Also, in the presence of noise there exists a trade off between the bias (strictly increasing function of d) and variance (strictly decreasing function of d) of the DOA estimate. In this paper, we propose a novel method for mitigating the angular bias caused due to finite microphone separation in an AVS. We have reduced the variance by increasing the microphone separation and then removed the bias with the proposed bias model. Our approach employs the finite element method (FEM) and curves fitting to model the angular bias in terms of microphone separations and frequency of a narrowband signal. Further, the bias correction algorithm based on the intensity spectrum has been proposed to improve the DOA estimation accuracy of a broadband signal. Simulation results demonstrate that the proposed bias correction scheme significantly reduces the angular bias and improves the root mean square angular error (RMSAE) in the presence of noise. Experiments have been performed in an acoustic full anechoic room to corroborate the effect of microphone separation on DOA estimation and the efficacy of the bias correction method.
Źródło:
Archives of Acoustics; 2022, 47, 2; 151-167
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wild Image Retrieval with HAAR Features and Hybrid DBSCAN Clustering For 3D Cultural Artefact Landmarks Reconstruction
Autorzy:
Pitchandi, Perumal
Powiązania:
https://bibliotekanauki.pl/articles/2201730.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
outliers removal
culturalartefact objects
3D reconstruction
particle swarm optimization
PSO
spatial clustering
density based spatial clustering
noise clustering algorithm
Opis:
In this digital age large amounts of information, images and videos can be found in the web repositories which accumulate this information. These repositories include personal, historic, cultural, and business event images. Image mining is a limited field in research where most techniques look at processing images instead of mining. Very limited tools are found for mining these images, specifically 3D (Three Dimensional) images. Open source image datasets are not structured making it difficult for query based retrievals. Techniques extracting visual features from these datasets result in low precision values as images lack proper descriptions or numerous samples exist for the same image or images are in 3D. This work proposes an extraction scheme for retrieving cultural artefact based on voxel descriptors. Image anomalies are eliminated with a new clustering technique and the 3D images are used for reconstructing cultural artefact objects. Corresponding cultural 3D images are grouped for a 3D reconstruction engine’s optimized performance. Spatial clustering techniques based on density like PVDBSCAN (Particle Varied Density Based Spatial Clustering of Applications with Noise) eliminate image outliers. Hence, PVDBSCAN is selected in this work for its capability to handle a variety of outliers. Clustering based on Information theory is also used in this work to identify cultural object’s image views which are then reconstructed using 3D motions. The proposed scheme is benchmarked with DBSCAN (Density-Based Spatial Clustering of Applications with Noise) to prove the proposed scheme’s efficiency. Evaluation on a dataset of about 31,000 cultural heritage images being retrieved from internet collections with many outliers indicate the robustness and cost effectiveness of the proposed method towards a reliable and just-in-time 3D reconstruction than existing state-of-the-art techniques.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 3; 269--281
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of quinoline using various particle sizes anthracite: adsorption kinetics and adsorption isotherms
Autorzy:
Xu, Hongxiang
Sun, Xianfeng
Yu, Yuexian
Liu, Guowei
Ma, Liqiang
Huang, Gen
Powiązania:
https://bibliotekanauki.pl/articles/109567.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorption isotherm
anthracite
particle size
quinoline adsorption kinetics
Opis:
This work provided an adsorption method of the removal of quinoline by using anthracite of various particle sizes. The characteristics of the adsorbents were analyzed by Camsizer XT for particle size analysis, FT-IR for functional groups, X-ray diffusion for mineralogical composition, Brunauer-Emmett-Teller for specific surface area and Barrett-Joyner-Halenda for pore size distribution. The average particle size of AC1-AC4 were 0.0342 mm, 0.1015 mm, 0.2103 mm and 0.3815 mm, respectively. The specific surface of the AC1-AC4 were 3.5 m2·g-1, 1.5 m2·g-1, 0.7 m2·g-1 and 0.1 m2·g-1 respectively. The adsorption capacity present a linear increase with the specific surface area increasing. To reveal the process of the adsorption, the adsorption kinetics and isotherms were performed. The kinetics data were analyzed by pseudo-first-order, pseudo-second-order and intra-particle diffusion equation using linearized correlation coefficient. Pseudo-second-order was found to best represent the kinetics data, which indicated that the adsorption of quinoline onto anthracite belongs to chemisorption. The equilibrium isotherms data were analyzed by Langmuir model and Freundlich model, the results indicated that the Freundlich model fit well for all the adsorption processes, which showed that the adsorption of quinoline onto anthracite belongs to endothermic reaction.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 196-207
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient nitrate adsorption from water by aluminum powder. Kinetic, equilibrium and influence of anion competition studies
Autorzy:
Fakhri, Y.
Kakavandi, B.
Safaei, Z.
Asadi, A.
Mohseni, S. M.
Golestanifar, H.
Powiązania:
https://bibliotekanauki.pl/articles/208008.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
aluminium compounds
kinetic parameters
kinetic theory
negative ions
nitrates
nitrogen removal
particle size
związki glinu
parametry kinetyczne
teoria kinetyczna
jony ujemne
azotany
usuwanie azotu
rozmiar cząstek
Opis:
The feasibility of aluminum powder (with particle size of 75–150 μm) for nitrate removal from aqueous solutions has been investigated. Adsorption was examined in function of initial nitrate concentration, contact time, pH and influence of other interfering anions. Maximum nitrate removal occurred at equilibrium pH of 10. The kinetics of adsorption of nitrate ions was discussed based on three kinetic models, namely: the pseudo-first order, the pseudo-second order and the intraparticle diffusion model. The experimental data fitted the pseudo-second order kinetic model very well; the rate constant was 4x10–4 g/ (mg·min) at the concentration of NO3- of 100 mg/dm3. The adsorption data followed both Langmuir (R2 = 0.808) and Freundlich (R2 = 0.865) isotherms probably due to the real heterogeneous nature of the surface sites involved in the nitrate uptake. The maximum sorption capacity of aluminum powder for nitrate adsorption was found to be ca. 45.2 mg/g at room temperature. The results indicate that aluminum powder is an interesting alternative for nitrate removal from the water.
Źródło:
Environment Protection Engineering; 2018, 44, 3; 19-31
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka rozkładów wielkości cząstek zawiesin zawartych w popłuczynach pochodzących z różnych faz płukania filtrów do odżelaziania i odmanganiania
Characteristics of particle size distribution in suspensions contained in spent filter backwash water collected on different stages of iron and manganese removal filter backwashing
Autorzy:
Wiercik, P.
Ludziejewska, J.
Kusnierz, M.
Burszta-Adamiak, E.
Powiązania:
https://bibliotekanauki.pl/articles/886854.pdf
Data publikacji:
2016
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
uzdatnianie wody
oczyszczanie sciekow
popluczyny
sklad granulometryczny
odzelazianie wody
odmanganianie wody
Opis:
Charakterystyka rozkładów wielkości cząstek zawiesin zawartych w popłuczynach pochodzących z różnych faz płukania filtrów do odżelaziania i odmanganiania. W artykule przedstawione zostały wyniki pomiarów rozkładów wielkości cząstek zawiesin zawartych w popłuczynach pochodzących ze stacji uzdatniania wód podziemnych w Golędzinowie. Próbki popłuczyn pobierano w trzech seriach badawczych w trakcie płukania filtrów do odżelaziania i odmanganiania w okresie od 20 sierpnia 2013 do 6 marca 2014 roku. Do oznaczenia składu granulometrycznego zawiesin użyto granulometr laserowy Mastersizer 2000. Badania wykazały, że w trakcie płukania filtrów rozkład wielkości cząstek zawiesin był zmienny. W zawiesinie w ujęciu objętościowym dominowały cząstki o wielkościach 1– –100 μm, a w ujęciu ilościowym – 0,1–1,0 μm. Dodatkowo dla filtra odmanganiającego we wszystkich fazach płukania uzyskiwano większe wartości wielkości cząstek niż w przypadku filtra odżelaziającego.
Characteristics of particle size distribution in suspensions contained in spent filter backwash water collected on different stages of iron and manganese removal filter backwashing. The study presents the results of measurement of particle size distribution in suspensions contained in spent filter backwash water obtained from the water treatment plant in Golędzinów. Spent filter backwash water samples were collected in three test series during the backwashing of iron and manganese removal filters, during the period from 20 August 2013 to 6 March 2014. Granulometric composition was determined by means of Mastersizer 2000 laser granulometer. The tests have proven that during the backwashing of filters the particle size distribution in suspensions was subject to changes. In terms of volume, particles of a size of 1–100 μm were dominant in the suspension, while in quantitative terms particles of a size of 0.1–1.0 μm. Additionally, for the manganese removal filter higher particle size values were obtained in all stages of backwashing than for the iron removal filter.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2016, 25, 2[72]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie licznika cząstek do kontroli i sterowania pracą filtrów pospiesznych w układzie oczyszczania wody powierzchniowej
Application of particle counters in rapid filter control in surface water treatment system
Autorzy:
Kłos, M.
Powiązania:
https://bibliotekanauki.pl/articles/237856.pdf
Data publikacji:
2014
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
pre-hydrolyzed coagulant
sweep coagulation
suspended solids removal
koagulant wstępnie zhydrolizowany
wielkość cząstek
koagulacja wymiatająca
usuwanie zawiesin
Opis:
Przedstawiono możliwości zastosowania licznika cząstek do sterowania pracą filtrów pospiesznych, jako uzupełnienia standardowego nefelometrycznego pomiaru mętności wody. Badania przeprowadzono na rzeczywistym układzie technologicznym oczyszczania wody powierzchniowej z zastosowaniem koagulantu wstępnie zhydrolizowanego. Stwierdzono, że licznik cząstek pozwala na lepszą kontrolę jakości filtratu niż sam pomiar mętności wody, a także na szybką identyfikację obecności w wodzie strąconych produktów hydrolizy koagulantów o dużym stopniu polimeryzacji form glinu. Wykazano, że w przypadku przedostawania się na filtr zawiesin pokoagulacyjnych powstających podczas przedawkowania koagulantu wstępnie zhydrolizowanego dochodzi do pogorszenia jakości filtratu, określanej na podstawie ogólnej liczby cząstek o wymiarach w zakresie 1÷15 µm. Niewłaściwa jakość filtratu utrzymuje się nawet po zmianie dawki koagulantu na optymalną. Oznacza to, że w przypadku przedawkowania koagulantu wstępnie zhydrolizowanego (poza zakres koagulacji wymiatającej) konieczne jest przerwanie cyklu filtracyjnego i wypłukanie złoża.
Application of particle counting in rapid filter control was presented as an addition to the standard nefelometric method of water turbidity measurement. The studies were performed on a real technological surface water treatment system using pre-hydrolyzed coagulant. It was stated that the particle counter allowed better quality monitoring of a filtrate in comparison to water turbidity measurement alone. In addition, it allowed rapid identification of precipitated hydrolysis products of coagulants characterized by high degree of aluminum form polymerization. It was demonstrated that membrane fouling by post-coagulation suspensions resulting from pre-hydrolyzed coagulant overdose led to deterioration in the filtrate quality, defined by the general particle size within the range from 1 to 15 µm. Inadequate filtrate quality was maintained even following the adjustment of the coagulant dose to optimal level. Therefore, in case of the pre-hydrolyzed coagulant overdose (out of sweep coagulation range) termination of the filtration cycle and filter bed washing are required.
Źródło:
Ochrona Środowiska; 2014, 36, 2; 17-20
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding of wet and alternative particle removal processes in microelectronics: theoretical capabilities and limitations
Autorzy:
Tardif, F.
Danel, A.
Raccurt, O.
Powiązania:
https://bibliotekanauki.pl/articles/308976.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cleaning
SC1
particle removal
Opis:
A 2 orders of magnitude range of van der Waals interactions is considered here to take the majority of the variety of shapes and materials of actual particles into account. Comparing these interactions with the repulsive forces generated by electrostatic charges, drag, surface tension, shock waves, high accelerations and aerosol particles, the intrinsic capabilities and limitations of the different cleaning processes can be predicted. Three kinds of particle-removal processes have been identified { universal processes capable of removing all particle sizes and types, even from patterned wafers, processes that present the same theoretical ability but are actually limited by the accessibility of the particles, and finally cleanings that are not able to remove all particle sizes.
Źródło:
Journal of Telecommunications and Information Technology; 2005, 1; 11-19
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

    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