Wszystkie pola: low calcium - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Setting Time and Compressive Strength of Geopolymers Made of Three Indonesian Low Calcium Fly Ash with Variation of Sodium Silicate Addition
Autorzy:: Hidayati, Ririn Eva
Faradilla, Fitria Sandi
Dadang, Dadang
Harmelia, Lia
Nurlina, Nurlina
Prasetyoko, Didik
Fansuri, Hamzah
Powiązania:: https://bibliotekanauki.pl/articles/2049135.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: fly ash
geopolymer
sodium silicate
low calcium
waste management
Opis:: In this research, the effect of sodium silicate (Na2SiO3) on the geopolymerization of fly ash type F (low calcium) has been studied. the variations of Na2SiO3 used in the synthesized geopolymers were 19, 32, and 41wt%. the fly ash from three different power plant sources was characterized using X-Ray Fluorescence (XRF), X-Ray diffraction (XRD), Particle Size Analyzer (PSA), and Scanning Electron Microscopy (SEM). Fly ash-based geopolymers were tested for mechanical strength and setting time. the best geopolymer was obtained by adding 32% Na2SiO3, produced a compressive strength of 21.62 MPa with a setting time of 30 hours. additions of 19wt% Na2SiO3 failed to form geopolymer paste while the addition of 41wt% Na2SiO3 decreased the mechanical strength of the geopolymer. Higher calcium content in low calcium fly ash produces stronger geopolymer and faster setting time.
Źródło:: Archives of Metallurgy and Materials; 2021, 66, 4; 1115-1121
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Influence of high calcium and low calcium fly ashes oh strength and water absorption of mortars
Wpływ wapiennego i krzemionkowego popiołu lotnego na wytrzymałość i nasiąkliwość zapraw
Autorzy:: Piasta, W.
Jaworska, M.
Bucik, A.
Powiązania:: https://bibliotekanauki.pl/articles/402507.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:: fly ash
mortars
water absorption
popioły lotne
zaprawy
nasiąkliwość
Opis:: The research was earned out to evaluate water absorption and strength of cement mortars with admixture of fly ashes. There have been presented experimental results of high and tow calcium fly ashes content and their combination on the physical properties of cement mortars. The tests were carried out using samples 4x4x16 cm in accordance to standard procedures.
Źródło:: Structure and Environment; 2013, 5, 3; 5-10
2081-1500
Pojawia się w:: Structure and Environment
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Investigation of the Mechanical Properties of Calcium Treated Low Carbon Steel
Autorzy:: Karabayrak, Barış
Baskut, Sinem
Turan, Dilek
Powiązania:: https://bibliotekanauki.pl/articles/2203716.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: clean steel
inclusion
tensile strength
fatigue
microstructure
Opis:: In this study, the effect of calcium treatment on the mechanical properties and fatigue behavior of low carbon steel material is investigated. By applying calcium treatment after aluminum deoxidation for steel cleanliness, the aim is to transform the inclusions into harmless structures and produce cleaner liquid steel. As a result of the study, calcium treated material’s tensile strength slightly increases while fatigue life decreases. SEM studies were conducted to evaluate the results and it was observed that while elongated inclusions were observed as well as spherical shapes in the untreated sample, the inclusions generally had a spherical shape in the calcium treated sample. After the steel cleanliness process, the mechanical properties of the samples were improved. The tensile strength of the calcium treated sample increased slightly. However, a significant decrease in fatigue strength was observed depending on brittle inclusions that occur as a result of the calcium treatment process.
Źródło:: Archives of Metallurgy and Materials; 2023, 68, 1; 89--96
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Study of the Effect of Low Temperatures and Calcium Chloride Treatment on the Germination of Iranian and European Barley Cultivars
Autorzy:: Abarnak, Setare
Zarei, Leila
Cheghamirza, Kianoosh
Powiązania:: https://bibliotekanauki.pl/articles/2199711.pdf
Data publikacji:: 2018-12-20
Wydawca:: Instytut Hodowli i Aklimatyzacji Roślin
Tematy:: barley,
correlation,
germination,
low temperature stress
Opis:: Low temperature stress is one of the limiting factors of seed germination. In order to investigate the effect of lowtemperatures on germination of barley cultivars, identification of traits related to low temperature stress at germinationstage and the effect of calcium chloride on these traits, 44 Iranian and European barley cultivars were evaluatedin a factorial experiment within completely randomized design with 3 replications in the Laboratory of Plant Physiology,Agronomy and Plant Breeding department, Razi University. The first factor was 44 Iranian and European barleycultivars, the second factor included four temperature (0, 5, 10 and 20°C), and the third factor was the use of calciumchloride (10 mM) and its non-use (distilled water). Analysis of variance showed that there was a significant differencebetween cultivars for all traits except root length and seed vigor. Applying calcium chloride treatment ata concentration of 10 mM did not significantly affect the traits under the studied temperatures. Reducing temperaturefrom 20°C to 10°C and 5°C reduced root length, shoot length, coleoptile length, root number, coefficient of velocityof germination, seed vigor and promptness index. The results of correlation analysis showed that there wasa significant positive correlation between promptness index with average velocity of germination, coefficient ofvelocity of germination and seed vigor, germination percentage and root number in all studied temperatures. Therewas little differentiation between Iranian and European cultivars by both cluster and discriminant analysis.
Źródło:: Plant Breeding and Seed Science; 2018, 78; 37-49
1429-3862
2083-599X
Pojawia się w:: Plant Breeding and Seed Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Mechanism and Synthesis of Yttrium Iron (Y-Fe) Alloy by Low Temperature Process Using Calcium as Reductant
Autorzy:: Ilayaraja, Marimuthu
Berchmans, L. John
Sankaranarayan, Sankara Raman
Powiązania:: https://bibliotekanauki.pl/articles/355144.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Gibbs free energy
reaction kinetics
VSM
XRD
SEM
Opis:: In this paper, study the preparation of Y-Fe alloy by reduction-diffusion process, which is novel technique for producing an alloy from its ores directly at different temperatures. From this work, investigates the particles size and morphology structure of alloy by X-Ray Diffraction (XRD), Energy dispersive-X-ray analyzer (EDAX) and Scanning Electron Microscope (SEM) respectively. Here study the thermodynamics of property of system such as Gibbs free energy and reaction kinetics of system respectively. The Vibrating Sample magnetometer (VSM) is used to study the magnetic properties of alloy such as cocerviety, saturation magnetization and retentivity.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 4; 1593-1596
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effect of gasifying agents and calcium oxide on gasification of low-rank coal and wastes
Autorzy:: Baranowski, M.
Pawlak-Kruczek, H.
Frydel, M.
Powiązania:: https://bibliotekanauki.pl/articles/175194.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: gasification
RDF
sewage sludge
lignite
calcium oxide
Opis:: The process of gasification is one of the promising technologies of clean combustible gas production from low-grade coals, such as lignite, coal mud and subbituminous LR coals, and from biomass and waste. However, depending on the type of gasification material, the following aspects require investigation and development: the selection of a gasification technology (including parameters and gasifying agents) and the removal of the components constituting a burden and contamination from the raw gas. This paper presents the results of research on the gasification of lignite and sludge with added refuse derived fuel and the gasification of both these substances with added calcium sorbents. Two gasifying agents, water vapour and carbon dioxide, were used in the experiments, which were carried out in a fixed bed reactor at the temperatures of 600, 700, 800, 900, and 1000 ◦C. The effects of process temperature, the calcium oxide addition and the gasifying agent composition and quantity on fuel conversion and product gas composition have been determined. Higher process temperatures in both atmosphere of gasification (H2O and CO2) cause an increase in the volume fraction of hydrogen and carbon monoxide in the resulting gas. The effect of the addition of calcium oxide (CaO) for carbon dioxide gasification of sewage sludge exhibits the positive effect. The increase in the volume of hydrogen and carbon monoxide in the syngas from gasification of sewage was observed. The gasifying agent has a different effect on the composition of the gas depending on the temperature. The gasification process in the atmosphere of water vapour starts faster than in the atmosphere of carbon dioxide and hydrogen formation is significantly higher.
Źródło:: Transactions of the Institute of Fluid-Flow Machinery; 2017, 137; 141-155
0079-3205
Pojawia się w:: Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Seedling growth, root development and nutrient use efficiency of Cypress clones in response to calcium fertilizer
Autorzy:: Zhang, Z.
Jin, G.
Zhou, Z.
Powiązania:: https://bibliotekanauki.pl/articles/2078194.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: Cupressus funebris
root development
nutrient accumulation efficiency
calcium response
fertile
soil
low fertility soil
Opis:: Cypress (Cupressus funebris Endl.) is an important tree species in the subtropical regions of China; it is also a major tree species for afforestation and forest land restoration under low-fertility soil conditions. Cypress is considered a calcicolous tree, and its growth and development can be promoted significantly by exchangeable calcium (Ca2+) in the soil. However, most of the subtropical regions have low-fertility acidic soils, in which Ca2+ gradually becomes a limiting element for Cypress growth. In this study, different concentrations of Ca2+ fertilizer were added under fertile soil (3 g kg−1 NPK fertilizer added) and low-fertility soil (0 g kg−1 NPK fertilizer added) conditions. Cypress clones responded differently to Ca2+ addition in different soil conditions. The seedling height and dry matter quality of Cypress in fertile soil were significantly greater than those in low-fertility soil, but plant height and dry biomass did not differ significantly among Ca2+ treatments. The accumulation efficiencies of nitrogen (N), phosphorous (P) and Ca all differed significantly among the Ca2+ treatments. In low-fertility soil, the addition of 3 g kg-1 Ca2+ significantly promoted development of roots 0.5–2 mm in diameter, and both the C1 and C2 clones achieved their highest N, P and Ca accumulation efficiencies. When the Ca2+ concentration increased to 6 g kg−1, the seedling height, dry matter quality and root development were lower than those of the 3 g kg−1 Ca2+ treatment. In the fertile soil, the addition of Ca2+ significantly inhibited development of roots 0.5–1 mm in diameter. The highest N accumulation efficiency was achieved under the 0 g kg−1 Ca2+ treatment, and the highest Ca accumulation efficiency was achieved under the 6 g kg−1 Ca2+ treatment. Seedling height, root dry weight, roots 0–1.5 mm in diameter and Ca accumulation showed a significant interaction effect between NPK fertilizer and Ca2+. Therefore, Ca accumulation was more efficient in low-fertility soils. Under low-fertility soil conditions, the addition of CaSO4 can promote the root development of seedlings and advance and prolong the fast growth period of seedling height. Cypress clones can be used as an important tree species for afforestation under low-fertility soil conditions, especially under calcareous soil conditions.
Źródło:: Dendrobiology; 2020, 84
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The depression mechanism on pyrite in a low-alkaline system with combined depressants : Experiment, HSC, DFT and ToF–SIMS studies
Autorzy:: Li, Suqi
Yuan, Jiaqiao
Ding, Zhan
Li, Jie
Yu, Anmei
Wen, Shuming
Bai, Shaojun
Powiązania:: https://bibliotekanauki.pl/articles/24085821.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: pyrite
calcium hypochlorite
lime
depression
low alkaline system
Opis:: Depression of pyrite in a low-alkaline system has sparked soaring interests for the multi-metal sulfide minerals flotation recently. This study investigates effects of combined depressants (Ca(ClO)2 and CaO) on pyrite flotation with butyl xanthate (KBX). Micro-flotation experiments indicate that the addition of 200 mg/L combined depressants (a mass ratios of CaO to Ca(ClO) 2 of 2:3) and 1.0×10−3 mol/L KBX at pH 9.5 can effectively depresses the flotation of pyrite, and a minimum pyrite recovery rate of 12.5% is obtained. Basic thermodynamic evaluation results confirm the participation of Ca(ClO) 2 significantly decrease the negative Gibbs free energies of pyrite oxidation reaction. Besides, the calcium species (Ca(OH) 2, Ca2+ and Ca(Cl) 2) will spontaneously transform into CaCO3,and it is the ultimate dominant calcium species in the CO32- system. Density functional theory (DFT) results indicate that CaCO3 can chemically adsorb onto the pyrite surface with an adsorption energy of –671.13 kJ/mol. The O1 and Ca atoms mainly contribute to the bonding process and are responsible for the stable adsorption of CaCO3. ToF-SIMS results provide strong evidence that the combined depressants increase the amount of hydrophilic species and decrease dixanthogen adsorption onto the pyrite surface. The thickness of the whole formed hydrophilic species is approximately 50 nm. Semiquantitative amounts of hydrophilic species follow the order of hydroxy calcium>iron carbonyl>calcium carbonate. Overall, hydrophilic species repulse adsorption of dixanthogen and significantly reduce the flotation performance of pyrite.
Źródło:: Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168454
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Analiza wpływu warunków niskotemperaturowego blanszowania na wyróżniki tekstury i barwy marchwi
Influence of the conditions of the low temperature blanching process on texture and colour features of carrot
Autorzy:: Guzek, D.
Wojtasik-Kalinowska, I.
Wierzbicka, A.
Powiązania:: https://bibliotekanauki.pl/articles/227933.pdf
Data publikacji:: 2010
Wydawca:: Wyższa Szkoła Menedżerska w Warszawie
Tematy:: niskotemperaturowe blanszowanie
marchew
tekstura
barwa
chlorek wapnia
low temperature blanching
carrot
texture
colour
calcium
chloride
Opis:: Celem pracy prezentowanej w artykule było wyznaczenie optymalnych warunków niskotemperaturowego blanszowania marchwi, warunkujących poprawę wybranych wyróżników tekstury oraz składowych barwy. Połowę analizowanej partii marchwi moczono w 1%-owym roztworze chlorku wapnia, a następnie marchew poddawana była niskotemperaturowemu blanszowaniu w temperaturach (50°C, 60°C, 70°C, 80°C, š0,5oC) w określonym czasie (5, 10, 15 minut). Natomiast druga połowa partii marchwi nie była poddawana procesowi moczenia w tym roztworze. Końcowy etap postępowania stanowiło konwencjonalne blanszowanie (97°C, 3 min) i natychmiastowe schładzanie. Wyróżniki tekstury marchwi (twardość i łamliwość) mierzono z wykorzystaniem instrumentalnego pomiaru tekstury przy pomocy uniwersalnej maszyny testującej Instron 4301. Składowe barwy w systemie L*a*b* wyznaczono przy użyciu chromametru Minolta CR 310. Stwierdzono, że ekspozycja na 1%-owy roztwór chlorku wapnia z zastosowaniem procesu niskotemperaturowego blanszowania w zakresie temperatury 60°C w czasie 10 minut, pozwala na uzyskanie marchwi cechującej się wyższymi wartościami kruchości niż w przypadku tradycyjnej technologii przy jednoczesnym braku wpływu tego procesu na zmiany składowych barwy.
The object of the presented research was to determine the influence of process conditions of low temperature carrot blanching on improvement of chosen texture features and components of colour. A half of analysed vegetables was exposed to 1% calcium chloride solution and then was low temperature blanched (50°C, 60°C, 70°C, 80°C, š0,5oC) for specified time (5, 10, 15 minutes). The final stages were conventional blanching (97°C, 3 minutes) and quick chilling. Texture features of carrot (hardness and fragility) were measured using universal testing machine INSTRON 4301. Measurement of components of colour was conducted in L*a*b* system using chromameter Minolta CR 310. Expositon to 1% calcium chloride solution accompanied by low temperature blanching in 60°C for the time of 10 minutes, allows to obtain carrot characterised by higher tenderness than conventional treatment and simultanously not change components of colour.
Źródło:: Postępy Techniki Przetwórstwa Spożywczego; 2010, 2; 56-60
0867-793X
2719-3691
Pojawia się w:: Postępy Techniki Przetwórstwa Spożywczego
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Prostaglandins and arterial wall lipid metabolism - in vitro, ex-vivo and in vivo radioisotopic studies
Autorzy:: Sinzinger, H
Rogatti, W.
Powiązania:: https://bibliotekanauki.pl/articles/69328.pdf
Data publikacji:: 1994
Wydawca:: Polskie Towarzystwo Fizjologiczne
Tematy:: metabolism
prostaglandin
lipid
calcium antagonist
in vivo
lipid metabolism
radioisotopic study
in vitro
hypercholesterolemia
low density lipoprotein
atherosclerosis
Źródło:: Journal of Physiology and Pharmacology; 1994, 45, 1
0867-5910
Pojawia się w:: Journal of Physiology and Pharmacology
Dostawca treści:: Biblioteka Nauki

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