Temat: Sand - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: « Comme si nous étions à la contredanse » : chorégraphies utopiques chez Claire de Duras et George Sand
“It is as if we were in a contradance”: choreographic utopias in novels by Claire de Duras and George Sand
Autorzy:: Nunn, Tessa Ashlin
Powiązania:: https://bibliotekanauki.pl/articles/2053487.pdf
Data publikacji:: 2021-12-30
Wydawca:: Katolicki Uniwersytet Lubelski Jana Pawła II. Wydawnictwo Werset
Tematy:: contredanses
utopie
George Sand
Claire de Duras
danses littéraires
contradances
utopia
literary dances
Opis:: Durant le premier XIXe siècle, la contredanse, constituée de déplacements et d’interactions entre tous les danseurs n’importe leur place de départ, abolit les contraintes d’une société divisée en classes. Dans Édouard (1825), Claire de Duras compare le moment des contredanses, pendant un bal parisien de l’Ancien Régime, à une échappée vers l’Angleterre, où l’ascension sociale semble réalisable. De plus, la danse crée un espace où l’héroïne peut franchir les barrières entravant les membres de son sexe et empêchant le mariage par amour. George Sand, dans Le Compagnon du Tour de France (1840), contraste la possibilité de l’amour entre des personnages de classes différentes lors des contredanses avec l’impossibilité de ces unions dans la vie quotidienne. En établissant un non-lieu, les contredanses de ces romans produisent des moments éphémères où l’égalité et la liberté règnent, pourtant, hors de la danse, les hiérarchies sociales demeurent rigides.
During the first half of the 19th century, contradances, made up of displacements and interactions between all the dancers starting in different places, abolish the obligations imposed by a society divided into classes. In Édouard (1825), Claire de Duras compares the performance of contradances, during an ancien régime ball, to fleeing to England, where social ascension seems possible. George Sand, in Le Compagnon du Tour de France (1840), contrasts the possibility of romantic relationships across classes during contradances with the impossibility of these unions in everyday life. By establishing a non-place, these fictional dances create ephemeral moments during which equality and freedom reign; however, off the dance floor, social hierarchies remain rigid.
Źródło:: Quêtes littéraires; 2021, 11; 76-86
2084-8099
2657-487X
Pojawia się w:: Quêtes littéraires
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: « Faut-il nécessairement que la beauté s’ignore pour ne rien perdre de son éclat ? » : le goût et la grâce dans Le Piccinino de George Sand
Autorzy:: Tonnerre, Olivier
Powiązania:: https://bibliotekanauki.pl/articles/559932.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Wrocławski. Oficyna Wydawnicza ATUT – Wrocławskie Wydawnictwo Oświatowe
Tematy:: grace
nobility
aristocracy
George Sand
taste
heredity
Opis:: « Faut-il nécessairement que la beauté s’ignore pour ne rien perdre de son éclat ? » : Good Taste and Grace in George Sand’s Le Piccinino In Histoire de ma vie, George Sand claims that the main reason she wrote Le Piccinino (1847) was so that she could present her views on the nobility in three central chapters. While using the discourse of the nobility on itself, in particular when it comes to the relationship between heredity and aristocratic memory, she also subverts this discourse by democratizing the relationship between memory and lineage. The rest of the novel offers many representations of noblewomen and noblemen, who all seem to share a specific trait: good taste and grace of manners, whose degree seems to accurately represent their position in society. This essay will explore these two facets of the nobility and the way in which they conspire to display an aura of natural superiority, while simultaneously being undermined by Sand’s very personal opinion, as she strives to dispel this long-lasting illusion.
Źródło:: Orbis Linguarum; 2018, 50; 361-371
1426-7241
Pojawia się w:: Orbis Linguarum
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: „Sekret” tradycyjnej technologii odlewania dzwonów
„The Secret” of Traditional Technology of Casting Bells
Autorzy:: Bartocha, D.
Baron, C.
Powiązania:: https://bibliotekanauki.pl/articles/382233.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: technologia odlewania
odlewanie dzwonów
brąz CuSn20-C
masa formierska
masa gliniana
masa ludwisarska
casting bells technology
CuSn20-C brass
mould sand
Opis:: Artykuł poświęcono zagadnieniu technologiczności tradycyjnego sposobu odlewania dzwonów. Pomimo złamania podstawowych zasad poprawnego projektowania technologii odlewania, tradycyjna technologia wykonywania dzwonów sprawdza się od setek lat. Autorzy analizując wyniki badań brązu CuSn20-C oraz tradycyjnej masy formierskiej używanej do wykonywania form na dzwony, próbują wykazać na czym polega tajemnica fenomenu najstarszej z aktualnie stosowanych technologii odlewania.
The article are devoted to the issue of manufacturability of the traditional way of casting bells. Despite breaking the fundamental principles of proper casting technology design, traditional technology of casting bells has works for hundreds of years. The authors have analyzing the investigations results of a bronze CuSn20-C and traditional molding sand is used to produce molds for bells and they have been trying to demonstrate what is the secret of the marvel of the oldest currently used casting technology.
Źródło:: Archives of Foundry Engineering; 2015, 15, 3 spec.; 5-10
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A comparison of oxygen diffusion rates in sand moistened with water or PEG 20000 solution
Autorzy:: Hiller, S.
Dexter, A.R.
Powiązania:: https://bibliotekanauki.pl/articles/24419.pdf
Data publikacji:: 1997
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: sand
air
oxygen diffusion
polyethylene glycol
water
Źródło:: International Agrophysics; 1997, 11, 3
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A laboratory investigation on shear strength behavior of sandy soil: effect of glass fiber and clinker residue content
Autorzy:: Bouaricha, L.
Djafar Henni, A.
Lancelot, L.
Powiązania:: https://bibliotekanauki.pl/articles/178431.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: direct shear test
glass fibers
clinker residue
peak shear stress
sand
normal stress
cohesion
frictional angle
Opis:: A study was undertaken to investigate the shear strength parameters of treated sands reinforced with randomly distributed glass fibers by carrying out direct shear test after seven days curing periods. Firstly, we studied the fiber content and fiber length effect on the peak shear strength on samples. The second part gives a parametric analysis on the effect of glass fiber and clinker residue content on the shear strength parameters for two types of uniform Algerian sands having different particle sizes (Chlef sand and Rass sand) with an average relative density Dr = 50%. Finally, the test results show that the combination of glass fiber and clinker residue content can effectively improve the shear strength parameters of soil in comparison with unreinforced soil. For instance, there is a significant gain for the cohesion and friction angle of reinforced sand of Chlef. Compared to unreinforced sand, the cohesion for sand reinforced with different ratios of clinker residue increased by 4.36 to 43.08 kPa for Chlef sand and by 3.1 to 28.64 kPa for Rass sand. The feature friction angles increased from 38.73° to 43.01° (+4.28°), and after the treatment, clinker residue content of soil evaluated to 5% (W_RC = 5%).
Źródło:: Studia Geotechnica et Mechanica; 2017, 39, 4; 3-15
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: A Miocene anastomosing river system in the area of Konin Lignite Mine, central Poland
Autorzy:: Widera, M.
Kowalska, E.
Fortuna, M.
Powiązania:: https://bibliotekanauki.pl/articles/191379.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: sedimentology
fluvial deposits
palaeochannel pattern
anastomosing river
sand-filled channels
Opis:: This sedimentological study of the Wielkopolska Member of the Miocene Poznań Formation in the Jóźwin IIB opencast lignite-mining field, central Poland, reveals a late mid-Miocene anastomosing fluvial system with ribbon-shaped channels filled mainly by sandy and muddy deposits. The fluvial system, extending across the eastern flank of the post-Mesozoic Kleczew Graben, was tributive in its eastern upper reaches, but was increasingly distributive and northwards deflected in its lower reaches near the graben axis. Lithofacies analysis of a representative palaeochannel indicates that the river discharge significantly fluctuated and that the channels were filled with mud-bearing stratified fine-grained sand by low-density tractional turbulent flow during the high and low water stages and with a massive mud or sandy mud by a high-density flow during the rising and falling stages. The spatial pattern of fluvial channels and deformation channel-fill sandbodies were controlled by the graben topography and the differential compaction of peat substrate, with possible influence of bedrock faults. The fluvial system is thought to have drained to an endorheic ‘terminal’ basin to the north, rather than into the hypothetical Baltic River and further westwards to the distant North Sea basin, as postulated by some previous authors. The present case study contributes to the known spectrum of anastomosing river systems as a sand- to mud-dominated end-member.
Źródło:: Annales Societatis Geologorum Poloniae; 2017, 87, 2; 157-168
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: A new antrhropogenic lake Kuźnica Warężyńska : thermal and oxygen conditions after 14 years of exploitation in terms of protection and restoration
Nowe jezioro antropogteniczne Kuźnica Warężyńska : stosunki termiczne i tlenowe po 14 latach eksploatacji – w aspekcie ochrony i rekultywacji
Autorzy:: Kostecki, Maciej
Powiązania:: https://bibliotekanauki.pl/articles/1845415.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: anthropogenic limnetic ecosystems
thermal and oxygen conditions
water reclamation of sand mine excavations
restoration of limnic ecosystems
antropogeniczne ekosystemy limnetyczne
warunki termiczne i tlenowe
wyrobiska kopalni piasku
rekultywacja wodna wyrobisk kopalni piasku
odbudowa ekosystemów limnicznych
Opis:: The results of the first limnological studies of the Kuźnica Warężyńska anthropogenic reservoir, by flooding the sand mine excavation, in 2005, are presented. Measurements of water temperature and the concentration of oxygen dissolved in water were made every month, from April to December, every 1 meter deep from the surface to the bottom (22 m). Kuźnica Warężyńska anthropogenic lake was classified according to Olszewski and Patalas as dimictic, eumictic, stratified, stable, and extremely limnic. In terms of the share of the littoral zone in the total area, the reservoir is classified as grade II according to Dołgoff, where the pelagic zone is similar to the littoral zone. After 14 years of the reservoir’s existence, during the summer stagnation period, the oxygen in the hypolimnion is completely depleted, from the 10th meter deep to the bottom, 22 m. The analysis of the vertical distribution of the regression coefficient for the relationship between water temperature and the concentration of dissolved oxygen in water indicates the influence of the oxygen-free groundwater supplying the reservoir as a factor that may, in addition to the decomposition of organic matter, initiate anaerobic processes in the bottom water layer of the reservoir. When circulation ceases, the bottom eruption of oxygen-depleted groundwater is, during the summer and winter stagnation, a factor that shapes the anaerobic environment in the bottom layers of water early, initiating the internal enrichment process. Hydrological conditions, morphometry and thermal-oxygen relations of the Kuźnica Warężyńska reservoir are favorable for undertaking technical measures – changing the method of draining water from the surface to the bottom – to protect the quality of water resources.
Przedstawiono wyniki pierwszych, od chwili powstania, poprzez zalanie wyrobiska kopalni piasku w 2005 r., badań stosunków termiczno-tlenowych nowego antropogenicznego zbiornika Kuźnica Warężyńska. Pomiary temperatury wody i stężenia rozpuszczonego w wodzie tlenu wykonywano od kwietnia do grudnia, co miesiąc, w odstępach co jeden metr głębokości od powierzchni do dna (22 m). Jezioro antropogeniczne Kuźnica Warężyńska sklasyfikowano, wg. Olszewskiego i Patalasa, jako dimiktyczne, eumiktyczne, stratyfikowane stabilne, skrajnie limniczne, z cechami Β-mezotrofii. Pod względem wielkości udziału strefy litoralowej w całkowitej powierzchni, zbiornik sklasyfikowano jako I-go stopnia wg. Dołgoffa. Po czternastu latach istnienia zbiornika, w okresie stagnacji letniej dochodzi do całkowitego wyczerpania tlenu w hypolimnionie, od dziesiątego metra głębokości do dna (22 m). Analiza pionowego rozkładu współczynnika regresji dla zależności pomiędzy temperaturą wody a stężeniem rozpuszczonego w wodzie tlenu wskazuje na wpływ zasilających zbiornik, pozbawionych tlenu, wód podziemnych, jako na czynnik mogący, oprócz procesu rozkładu materii organicznej, inicjować procesy beztlenowe w przydennej warstwie wody zbiornika. Z chwilą ustania cyrkulacji, denna erupcja pozbawionych tlenu wód podziemnych stanowi, w okresie stagnacji letniej i zimowej czynnik kształtujący wcześnie środowisko beztlenowe w przydennych warstwach wody, inicjujący proces wzbogacania wewnętrznego. Warunki hydrologiczne, morfometria oraz stosunki termiczno-tlenowe zbiornika Kuźnica Warężyńska są korzystne dla podjęcia technicznych zabiegów, polegających na zmianie sposobu odprowadzania wody z powierzchniowego na denny, służących ochronie jakości zasobów wodnych.
Źródło:: Archives of Environmental Protection; 2021, 47, 2; 115-127
2083-4772
2083-4810
Pojawia się w:: Archives of Environmental Protection
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A new method for the measurement of flowability of green moulding sand
Nowa metoda pomiaru płynności klasycznej masy formierskiej
Autorzy:: Bast, J.
Powiązania:: https://bibliotekanauki.pl/articles/354188.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Clay-bonded moulding sand
compactability
flowability
measurement methods
metody pomiaru masy formierskiej
kompatybilność
płynność
metody pomiaru
Opis:: The production of castings by green sand moulds is a very important method for the manufacture of final products for different sectors of industry. In this green sand moulding process the quality of castings depends strongly on the quality of the mould, which in turn is determined by parameters such as the type of foundry machine, the characteristics of the moulding sand and the specifications of the patterns. The mould’s stability for use casting is achieved by filling and compacting moulding sand. This means, that the clay-bonded moulding sand is changed from the free flowing to the compacted state. In this process flowability is a very important parameter. Therefore, a variety of methods for the determination of flowability have been in use. However, it is fair to say that these methods do no longer meet the requirements of the modern moulding process. This paper introduces a new method for the determination of flowability of clay-bonded moulding sand using a specifically designed type of density sensor that was developed by a research team led by Professor Jürgen L. Bast at the Mechanical Department of Technical University Bergakademie Freiberg. The high levels of accuracy in the determination of flowability that this method is capable of achieving have been tested and indeed proven by varying sand parameters such as water and clay content, grain composition, mixing time, and compaction pressure. A further innovative characteristics of this new method of sensor-based flowability measurement is the possibility of using the sensor not only for the lab-based testing of sands but in the actual mould during the production process in the foundry, which allows to determine whether the sand in the mould has the required qualities based on real-time flowability measurements.
Produkcja odlewów w formach wilgotnych jest bardzo ważna metodą w wytwarzaniu finalnych wyrobów w wielu dziedzinach przemysłu. W procesie formowania ”na wilgotno” jakość odlewów zależy istotnie od jakości formy, która z kolei jest określona przez takie parametry jak: rodzaj maszyny formierskiej, charakterystyka masy formierskiej oraz parametry modeli. Stabilność formy odlewniczej jest osiągana podczas wypełniania przestrzeni technologicznej oraz zagęszczania masy formierskiej. Oznacza to zmiane stanu masy formierskiej od stanu luźno usypanego do stanu zagęszczonego. W tych procesach płynność masy jest bardzo ważnym parametrem. Dlatego też, stosowanych jest wiele metod określania płynności masy. Trudno jest jednak stwierdzić, że metody te spełniają wymagania nowoczesnych procesów formowania. W artykule zaprezentowano nową metodę określania płynności mas z lepiszczem, wykorzystującą specjalnie zaprojektowany czujnik zagęszczenia - opracowany w zespole badawczym kierowanym przez Profesora Jürgena Basta na Wydziale Mechanicznym Uniwersytetu Technicznego (Akademii Górniczej) we Freibergu. Wysoki poziom dokładności określania płynności, który może być osiągany w tej metodzie, został wykazany badaniami testowymi, przy zmiennych parametrach: wilgotności masy i zawartości lepiszcza, składu ziarnowego osnowy, czasu mieszania masy oraz wartościach nacisków podczas zageszczania. Kolejne cechy innowacyjne tej nowej metody określania płynności z zastosowaniem wspomnianych czujników to możliwość jej wykorzystania nie tylko w warunkach badan laboratoryjnych masy, ale również podczas procesu wytwarzania form w odlewni. Umożliwia to określenie w czasie rzeczywistym, czy masa wykorzystywana w procesie formowania ma wymagana jakość.
Źródło:: Archives of Metallurgy and Materials; 2013, 58, 3; 945-952
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: A Novel Approach to Quantifying the Effect of the Density of Sand Cores on Their Gas Permeability
Autorzy:: Sundaram, Dinesh
Svidró, József Tamás
Svidró, Judit
Diószegi, Attila
Powiązania:: https://bibliotekanauki.pl/articles/2105204.pdf
Data publikacji:: 2022
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: compaction
density
furan sand
gas permeability
porous media
Opis:: The density of moulding mixtures used in the foundry industry plays a significant role since it influences the strength, porosity, and permeability of moulds and cores. The latter is routinely tested in foundries using different solutions to control the properties of the moulding materials that are used to make moulds and cores. In this paper, the gas permeability of sand samples was measured using a custom-made setup to obtain the gas permeability in standard units instead of the usual permeability numbers (PN) with calibrated units. The aim of the work was to explore the effect of density variations in moulding materials on their gas permeabilities. Permeability in this work is quantified in SI units, square metres [m2]. The setup works based on Darcy’s law and the numbers obtained from the measurements can be used to deduce the gas permeability, k, of a sample. Two furan resin bonded mixtures with the same grain size distribution were hand-rammed with varying compaction forces to obtain a variation in density. Cylindrical samples (50 × 50 mm) were prepared using a silica sand aggregate sourced from a Swedish lake. The results of the measurement provided the difference in gas permeability between the samples that have varying densities. The results of permeability were then extrapolated by modifying the viscosity value of the air passed through the sample. In order to find the effect of apparent density variation on the pore characteristics of the samples, mercury intrusion porosimetry (MIP) was also performed. The results were in line with the gas permeability measurements.
Źródło:: Journal of Casting & Materials Engineering; 2022, 6, 2; 33--38
2543-9901
Pojawia się w:: Journal of Casting & Materials Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: A quasi phase-resolving model of net sand transport and short-term cross-shore profile evolution
Autorzy:: Ostrowski, R.
Powiązania:: https://bibliotekanauki.pl/articles/48565.pdf
Data publikacji:: 2003
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: coastal zone
hydrodynamics
wave-current condition
cross-shore profile
Baltic Sea
evolution
modelling
sand transport
sediment transport
hydrodynamic impact
Opis:: A way of modelling of the net sediment transport rate on a cross-shore profile and the resulting sea bed changes is presented. In the sediment transport computations, a three-layer model with a description of the bedload based on the water-soil mixture theory by Kaczmarek& Ostrowski (1998, 2002) is used. The modelling system is applied to wave-current conditions variable over the cross-shore profile, and determined using the computational frameworkof Szmytkiewicz (2002a, b). The sediment transport module incorporates the asymmetric wave approaches as proposed by Ostrowski (2002). Model simulations have been produced for uniformly sloped and multi-bar initial cross-shore profiles. Some of the model results are compared with the IBW PAN (Institute of Hydroengineering of the Polish Academy of Sciences) field data collected at the Coastal Research Station in Lubiatowo.
Źródło:: Oceanologia; 2003, 45, 2
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: A Study of Inclusions in Aluminum and Titanium Deoxidized 4130
Autorzy:: Tuttle, R. B.
Kottala, S.
Powiązania:: https://bibliotekanauki.pl/articles/379476.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: steel
sand casting
inclusions
electrolytic extraction
inclusion characterization
stal
odlewanie piaskowe
wtrącenia
ekstrakcja elektrolityczna
Opis:: In this paper, the authors investigated the size distribution of titanium oxide (TiO2), titanium nitride (TiN) and titanium carbide (TiC) inclusions in a titanium deoxidized 4130 steel and compared it with the 4130 base alloy composition inclusions. TiN and TiC inclusions are of particular interest due to their role as heterogeneous nuclei for various phase reactions in steels. Two types of samples were prepared, a polished sample and a filtered sample. Electrolytic dissolution was employed to make the filter paper samples. The size range of titanium inclusions was found to be more than that of the non-metallic inclusions from 4130 base alloy heat. Titanium inclusions from the filter and polished samples were round in shape. TiC and TiN inclusions were not found in the electrolytic extraction samples. Inclusions and their chemistries were analyzed using scanning electron microscope and energy dispersive spectrometer. The inclusion size range was larger for the titanium deoxidized samples than the base alloy. However, in both steels the majority of inclusions had a size smaller than 10 μm.
Źródło:: Archives of Foundry Engineering; 2018, 18, 1; 129-134
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: A Study on Modelling the Plane Strain Behaviour of Sand and its Stability
Autorzy:: Sawicki, A.
Sławińska, J.
Powiązania:: https://bibliotekanauki.pl/articles/241244.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:: sand deformations
liquefaction
instability
plane strain
Opis:: The plane strain behaviour of sand is studied using, previously proposed, incremental model describing its pre-failure deformations. Original model has been formulated for the tri-axial configuration, and then generalized for 3D conditions. This 3D model was subsequently adapted to study deformations of sand in the plane strain conditions, in the x1, x3 plane. There are three unknowns in such a configuration, namely the principal strains ε1 , ε3 and the principal stress σ2. Respective equations were derived, and then applied to study deformations of sand for chosen stress paths. The governing incremental equations were integrated numerically, and it was shown, for some loading paths, that σ2 depends linearly on the other principal stresses, so introduction of apparent Poisson's ratio is justified, as a kind of approximation. Subsequent analysis of deformations of sand was performed using this concept, as well as using full system of governing equations.
Źródło:: Archives of Hydro-Engineering and Environmental Mechanics; 2012, 59, 3-4; 85-100
1231-3726
Pojawia się w:: Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Ability of Response Surface Methodology to Optimize Photocatalytic Degradation of Amoxicillin from Aqueous Solutions Using Immobilized TiO2/Sand
Autorzy:: Sulaiman, Fadia A.
Alwared, Abeer I.
Powiązania:: https://bibliotekanauki.pl/articles/2086434.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: amoxicillin
solar photocatalyst
immobilized TiO2
sand
RSM
response surface methodology
kinetics
Opis:: The response surface method was applied to optimize operational factors in the solar photocatalytic process on the removal of Amoxicillin (AMOX) residues from aqueous solution using TiO2 immobilized on the sand as a catalyst. The results reveal that the degradation percentage of AMOX is 93.12%, when optimal conditions of pH=5, 75 mg/l of TiO2, 400 mg/l of H2O2, and 10 mg/l of AMOX concentration at 150 min irradiation time were used. Furthermore, the model’s expected response results have reasonable similarity with the actual data (R2 = 93.58%), demonstrating the efficiency of this method in making an accurate prediction. A second-order polynomial multiple regression model was used to evaluate the responses, which confirms that was a satisfactory adjustment with the achieved data through analysis of variance (R2 = 93.58%, R2adj = 91.48% and R2pred =89.68%). In addition, it is observed that the removal of undesirable compounds follows a pseudo-2nd order kinetic model with R2 = 0.9862. In conclusion, with the ease of usage of immobilized TiO2 and good photocatalytic efficiency, the findings showed the potential application to the antibiotics from an aqueous solution.
Źródło:: Journal of Ecological Engineering; 2022, 23, 5; 293--304
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Abrasion Resistance of S235, S355, C45, AISI 304 and Hardox 500 Steels with Usage of Garnet, Corundum and Carborundum Abrasives
Autorzy:: Szala, Mirosław
Szafran, Michał
Macek, Wojciech
Marchenko, Stanislav
Hejwowski, Tadeusz
Powiązania:: https://bibliotekanauki.pl/articles/103045.pdf
Data publikacji:: 2019
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: abrasion
wear resistance
dry sand-rubber wheel test
garnet
aluminum oxide
silicon carbide
steel
hardness
microstructure
odporność na ścieranie
test koła suchy piasek-guma
granat
tlenek glinu
węglik krzemu
stal
twardość
mikrostruktura
Opis:: The steel presents a wide field of application. The abrasive wear resistance of steel relies mainly on the microstructure, hardness as well as on the abrasive material properties. Moreover, the selection of a abrasion-resistant grade of steel still seems to be a crucial and unsolved problem, especially due to the fact that the actual operating conditions can be affected by the presence of different abrasive materials. The aim of this work was to determine the effect of different abrasive grit materials i.e. garnet, corundum and carborundum on the abrasive wear result of a commonly used in industry practice steels i.e. S235, S355, C45, AISI 304 and Hardox 500. The microstructure of the steel was investigated using light optical microscopy. Moreover, hardness was measured with Vickers hardness tester. Additionally, the size and morphology of the abrasive materials were characterized. The abrasion tests were conducted with the usage of T-07 tribotester (dry sand rubber wheel). The results demonstrate that the hardness and structure of steels and hardness of abrasive grids influenced the wear results. The abrasive wear behavior of steels was dominated by microscratching and microcutting wear mechanisms. The highest mass loss was obtained for garnet, corundum, and carborundum, respectively. The usage of various abrasives results in different abrasion resistance for each tested steel grade. The AISI 304 austenitic stainless steel presents an outstanding abrasive wear resistance while usage of corundum and Hardox 500 while using a garnet as abrasive material. The C45 carbon steel was less resistant than AISI 304 for all three examined abrasives. The lowest resistance to wear in garnet and carborundum was obtained for the S235JR and S355J2 ferritic-perlitic carbon steels and in corundum for Hardox 500 which has tempered martensitic structure.
Źródło:: Advances in Science and Technology. Research Journal; 2019, 13, 4; 151-161
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Abrasive Wear Mechanisms of S235JR, S355J2, C45, AISI 304, and Hardox 500 Steels Tested Using Garnet, Corundum and Carborundum Abrasives
Autorzy:: Szala, Mirosław
Szafran, Michał
Matijošius, Jonas
Drozd, Kazimierz
Powiązania:: https://bibliotekanauki.pl/articles/2201922.pdf
Data publikacji:: 2023
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: abrasion
wear resistance
dry sand-rubber wheel test
tribology
steel
wear mechanism
roughness analysis
failure analysis
Opis:: Wear resistance is one of the main indicators of the reliability of machine parts. The selection of wear-resistant material should consider the operational environment and specific types of abrasive material. The steel abrasive wear resistance depends not only on its hardness and microstructure but also on the abrasive material's properties, such as hardness and particle morphology. This work aimed to determine abrasion wear mechanisms of a set of steels, i.e., S235, S355, C45, AISI 304 and Hardox 500, abraded by different types of grit i.e. garnet, corundum and carborundum. The abrasion tests were conducted using T-07 tribometer (rubber wheel method). Wear traces were examined with a scanning electron microscope (SEM), and a contact profilometer. SEM analysis revealed that apart from Hardox 500, ploughing and microfatigue were the dominant wear mechanisms. Microcutting was the main wear mechanism for Hardox 500 tested with carborundum (SiC). The highest mass loss was usually obtained for carborundum. The lowest wear resistance in garnet and carborundum was obtained for the S235JR and S235J2 steels and Hardox 500 tested with corundum. The effect of steel microstructure on the wear mechanism has been confirmed. AISI 304 austenitic steel abraded by carborundum grit, presented outstanding roughness parameters: Ra, Rz, RSm, Rk, Rvk and Rpk than other steels tested with carborundum. Steel hardness affects the morphology of the wear trace reducing the Ra and Rz roughness parameters. The effect of abrasive hardness and grain morphology on abraded surfaces has been stated. Contrary to fine grains of the hardest carborundum, coarse garnet grains caused high roughness parameters (Rk, Rpk and Rvk) determined in wear trace.
Źródło:: Advances in Science and Technology. Research Journal; 2023, 17, 2; 147--160
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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