Temat: oxide - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Evaluation of the quality of titanium oxide and copper oxide layers by means of optical microscopy
Autorzy:: Głuszek, A.
Sawicka-Chudy, P.
Wisz, G.
Sibiński, M.
Cholewa, M.
Powiązania:: https://bibliotekanauki.pl/articles/101772.pdf
Data publikacji:: 2018
Wydawca:: Instytut Polityki Energetycznej im. Ignacego Łukasiewicza
Tematy:: titanium oxide
copper oxide
optical microscopy
histograms
Opis:: The aim of this paper is to analyse high-resolution optical images of the surface layers of titanium oxide and copper oxide. The materials were produced using the PREVAC Modular Platform for layer deposition located at the University of Rzeszów. Images with a magnification of 50x were obtained using an optical microscope. On the basis of the results obtained, the quality of the layers was evaluated based on the image analysis. The quantitative method of analysis was applied, as a result of which the conditions of the manufacturing process for which the obtained layers had the highest homogeneity were indicated. The minimum range of grey shade counting was from 65 to 150 and the maximum range from 135 to 220. The standard deviation was from 8 to 40%.
Źródło:: Energy Policy Studies; 2018, 1 (2); 39-51
2545-0859
Pojawia się w:: Energy Policy Studies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Synthesis and Characterization of Nanocomposite Sulfonated PVDF Membrane
Autorzy:: Juliandri, Juliandri
Rukiah, Rukiah
Ernawati, E. E.
Silitonga, M. P. R.
Nasir, M.
Powiązania:: https://bibliotekanauki.pl/articles/1167197.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: PVDF membrane
nanocomposites
silicon oxide
titanium oxide
Opis:: As a commercial fuel cell membrane, Nafion has disadvantages such as low stability at high temperature and low conductivity at low humidity. Sulfonated Polyvinylidene fluoride (PVDF) is known for good mechanical and thermal properties as a membrane. The purpose of this research is to synthesis a nanocomposite PVDF-TiSiO4 membrane as a potential replacement of Nafion. PVDF sulfonation was performed using concentrated sulfuric acid. The nanocomposites TiSiO4 were synthesized from TiCl4 and TEOS. Ultrasonification was used to insert the nanomaterial to the sulfonated membrane. The infrared spectra analysis shows the peak for the Ti-O-Si angel. SEM-EDX analysis shows that the nanocomposite PVDF-TiSiO4 membrane contents titanium oxide. The conductivity analysis shows the increasing of conductivity on addition of nanomaterials.
Źródło:: World Scientific News; 2018, 105; 218-224
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Adsorption of Zn2+, Cd2+ and Cu2+ on zeolites coated by manganese and iron oxides
Autorzy:: Irannajad, M.
Hhaghighi, H. K.
Soleimanipour, M.
Powiązania:: https://bibliotekanauki.pl/articles/110138.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: adsorption
wastewater
manganese oxide
iron oxide
zeolite
Opis:: Adsorption of copper, cadmium and zinc on manganese and iron oxide coated zeolite from aqueous solution was investigated in a batch mode. Experiments were conducted to investigate the effects of the initial concentration of metals, initial pH, contact time and temperature on the adsorption of ions. According to the results, adsorption of ions on manganese and iron oxide coated zeolite increased with the enhancement of initial Cu2+, Zn2+ and Cd2+ concentrations and contact time and also with increase of temperature. The results showed that at the beginning, the adsorption rate of Cu2+ and Cd2+ was more than 90 %. This rate continued to be slower for Zn2+ in both zeolites. Furthermore, the amount of Cu2+, Zn2+, and Cd2+ adsorption on the manganese oxide coated zeolite (qe) was equal to 14 mg/g, 9 mg/g and 16 mg/g and on the iron oxide coated zeolite it was 11 mg/g, 7 mg/g and 13mg/g, respectively. It was shown that at the concentrations below 100 mg/dm3 adsorption was rapid and almost all heavy metals were adsorbed. As a result, the significant factor affecting qe is the proportion of weight to liquid and pH in the solutions. Finally, the results showed that the adsorption of Zn2+, Cu2+ and Cd2+ onto the manganese oxide coated zeolite followed both the Langmuir and Freundlich isotherm models.
Źródło:: Physicochemical Problems of Mineral Processing; 2016, 52, 2; 894-908
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Synthesis and Thermal Properties of Europium-Cerium Oxide as a New Fluorite-Type Ceramic Material for Thermal Barrier Coatings Applications
Autorzy:: Mikuśkiewicz, M.
Stopyra, M.
Moskal, G.
Powiązania:: https://bibliotekanauki.pl/articles/352272.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: TBC
cerium oxide
europium oxide
thermal properties
Opis:: In the present paper the structure and thermal properties of europium cerium oxides were investigated. The material for the research was obtained via solid state synthesis. The initial powders: ceria CeO₂ and europia Eu₂O₃ were mixed in 1:1 mass ratio (non-stoichiometric proportion with the excess of CeO₂) and milled. The sintering process was performed using high temperature vacuum press at 1350°C. Calorimetric analysis was conducted both for initial powders and milled mixture. The structure, phase composition and thermal diffusivity of obtained material were investigated in as-sintered condition. It was revealed that the obtained material was multi-phase. Non-stoichiometric phases including Ce_0.5Eu_0.5O_1.75 with fluorite type structure and different lattice parameters were present. Thermal diffusivity decreased in the range from 25 to 900°C from 1.49 to 0.57 mm² /s and then increased to 0.70 mm² /s at 1400°C.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 4; 2089-2093
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Synthesis and Thermal Properties of Cerium-Dysprosium Oxide
Autorzy:: Mikuśkiewicz, M.
Stopyra, M.
Moskal, G.
Powiązania:: https://bibliotekanauki.pl/articles/356941.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: cerium oxide
dysprosium oxide
hermal properties
TBC
Opis:: The paper presents results of investigation on synthesis and characterization of cerium-dysprosium oxide. The input powders - dysprosium oxide Dy,sub>2O₃ and cerium oxide CeO₂ - were mixed so as to obtain equimolar ratio of cations, milled in alcohol and synthesized via solid state reaction process at 1350°C under 15MPa in vacuum for 2h. The microstructure, phase composition and thermal properties were analyzed. The obtained material was multiphase. Non-stoichiometric compounds were identified. Thermal diffusivity of investigated material decreased in the temperature range of 25-1000°C from 0,71 to 0,45 mm²/s.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 2B; 965-969
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Morphology and properties of the graphene layer on the copper substrate
Autorzy:: Pietrzak, K.
Olesińska, W.
Strąk, C.
Siedlec, R.
Gładki, A.
Powiązania:: https://bibliotekanauki.pl/articles/778091.pdf
Data publikacji:: 2015
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: copper
graphene
graphene oxide
reduced graphene oxide
Opis:: The aim of the work presented in the article was to clarify controversial comments about anti-corrosion and mechanical properties of graphene coatings, deposited on copper substrates. It was designed special experimental cycle comprising: preparation of graphene forms and copper, the observation of layers Cu / GO (rGO) after the thermal reduction processes and oxidative test in air at 150°C temperature and 350 h in time. The resulting coatings and graphene layers were subjected to tribological test for hardness. The observed differences in the continuity of the coverage copper surface by graphene forms, allowed to understand the macroscopic effect of increased hardness and wear resistance layers rGO/Cu.
Źródło:: Polish Journal of Chemical Technology; 2015, 17, 4; 104-108
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Synthesis of Copper-based Multi-walled Carbon Nanotube Composites
Autorzy:: Domagała, K.
Borlaf, M.
Kata, D.
Graule, T.
Powiązania:: https://bibliotekanauki.pl/articles/355954.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: MWCNT
water treatment
copper
cuprous oxide
cupric oxide
Opis:: In this study, the synthesis of copper-based multi-walled carbon nanotube compositesis described. Over the last years, carbon nanotubes (CNTs) have been widely used in many scientific research fields and have found applications in several sectors, e.g. for water treatment. This work focuses on combining the exceptional characteristics of CNTs, such as high specific surface areaand antibacterial properties, with the antimicrobial / antivirus features of copper oxides. The influence of synthesis parameters and thermal treatment on the final product was studied. Copper leakage was evaluated at both pH 5 and pH 7, confirming the possibility of applying Cu-based MWCNT composites in water filtration systems.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 1; 157-162
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Graphene oxide and green-synthesized reduced graphene oxide in chitosanbased nanocomposites
Autorzy:: Kosowska, K.
Domalik-Pyzik, P.
Chłopek, J.
Powiązania:: https://bibliotekanauki.pl/articles/284287.pdf
Data publikacji:: 2017
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: graphene oxide
reduced graphene oxide
chitosan
hydroxyapatite
biomaterial
Opis:: The first part of the paper concerns synthesis and characterization of two types of nanomaterials: graphene oxide (GO) prepared by modified Marcano method and reduced graphene oxide (rGO) synthesized using green reductant, L-ascorbic acid. Their structural properties were investigated by attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR) and X-ray diffraction (XRD). Results confirmed that L-ascorbic acid is an effective reducing agent. Intensity of the oxygen-groups decreased dramatically what resulted in reduction of the GO interlayer spacing from 0.8 nm to 0.4 nm. The second part of the research was concentrated on the properties of chitosan nanocomposites modified with GO and rGO. Films were prepared by mixing of the chitosan solution with the nanoparticles dispersion. Scanning electron microscopy (SEM) was used to investigate the microstructure of the composites surface. In addition, wettability and pore size of the freeze-dried scaffolds were evaluated. Results of the mechanical tests (increase in Young’s modulus) and structural characterization confirmed that chitosan solution and GO dispersion can be mixed homogeneously. Reduction of GO during composite synthesis resulted in better dispersion of the nanosheets what increased surface roughness, wettability and stability in distilled water, PBS and Ringer’s solution compared to composite with GO. After detailed biological examination, rGO-modified nanocomposites can be potentially applied in tissue engineering.
Źródło:: Engineering of Biomaterials; 2017, 20, 142; 11-16
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Investigation of Metal Oxides as Catalysts for the Thermal Decomposition of Potassium Chlorate(VII)
Autorzy:: Wojewódka, A.
Zakusylo, R.
Kravets, V.
Romanchenko, A.
Jarosz, T.
Powiązania:: https://bibliotekanauki.pl/articles/358236.pdf
Data publikacji:: 2018
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: metal oxide catalysts
thermal decomposition
potassium perchlorate
manganese oxide
copper oxide
differential thermal analysis
Opis:: The results of studies on the thermal decomposition of potassium chlorate(VII) (PP) and the catalytic effects of copper, iron, nickel, titanium, magnesium, chromium and manganese oxides on the process are presented in this paper. The investigated oxides are ranked according to the magnitude of their catalytic effect; of these, CuO and МnО2 show the best catalytic performance. These oxides reduce the PP decomposition temperature from 919.3 K down to even 825.2 K. The share of the catalytic additive in the composition, required to achieve a desirable thermal decomposition profile, was found to be no more than 0.5 wt.%. The activation energy of the decomposition process was determined, using the modified Freeman and Carroll method for both neat PP and PP supplemented with MnO2; the addition of the catalyst produced a 48.8% decrease in the activation energy of thermal decomposition.
Źródło:: Central European Journal of Energetic Materials; 2018, 15, 2; 327-338
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Metody syntez i badania właściwości grafenu
Methods of synthesis and testing properties of graphene
Autorzy:: Jonik, J.
Purchała, M.
Grajek, H.
Powiązania:: https://bibliotekanauki.pl/articles/270836.pdf
Data publikacji:: 2016
Wydawca:: Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:: tlenek grafitu
tlenek grafenu
zredukowany tlenek grafenu
graphite oxide
graphene oxide
reduced graphene oxide
Opis:: Grafen i jego pochodne są materiałami o unikalnych właściwościach biochemicznych, elektrycznych, optycznych i mechanicznych, co wzbudza zainteresowanie w wielu ośrodkach badawczych. Z tego powodu, na podstawie dostępnej literatury, podjęliśmy próbę zestawienia i interpretacji wyników badań uprzednio wymienionych materiałów otrzymanych różnymi metodami. Analizując wyniki badań różnych materiałów grafenopodobnych, można przypuszczać, że najbardziej ekonomiczną metodą otrzymywania grafenu jest zmodyfikowana metoda Hummersa. Najlepszymi technikami pomiarowymi są spektroskopia Ramana i rentgenowska spektroskopia fotoelektronów. Obydwie techniki umożliwiają ocenę składu chemicznego badanych próbek oraz stopnia ich zdefektowania. W pracy przedstawiono również niektóre z licznych zastosowań tych materiałów oraz wnioski.
Graphene and its derivatives are the materials with unique biochemical, electric, optical and mechanical properties, which has aroused interest in many research centres. Therefore, on the basis of the accessible literature, we attempt to collate and interpret the results of the aforesaid materials obtained by different methods. Analysing the results for the different graphene-like materials one can suppose, that the most economical method of the graphene synthesis is the modified Hummers’ method. The most useful testing techniques are the Raman spectroscopy and the X-ray photoelectron spectroscopy. Both techniques enable the estimation of the chemical composition and the presence of defect structure in the materials. Some of the many applications of the materials and conclusions are also presented in our review.
Źródło:: Aparatura Badawcza i Dydaktyczna; 2016, 21, 2; 110-117
2392-1765
Pojawia się w:: Aparatura Badawcza i Dydaktyczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Fabrication of a Novel Silver-Based Electrical Contact Composites and Assessment of Its Mechanical and Electrical Properties
Autorzy:: Kumar, Praveen S.
Senthil, S. M.
Parameshwaran, Rathinasamy
Rathanasamy, Rajasekar
Powiązania:: https://bibliotekanauki.pl/articles/2049131.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: silver tin oxide
electrical contact
composites
tungsten oxide
conductivity
Opis:: The electrical contactors play a crucial role in closing the circuit in many power distribution components like overhead lines, underground cables, circuit breakers, transformers, and control systems. The failure in these components mainly occurs due to the break-down of contactors due to the continuous opening and closing action of contacts. Silver (Ag)-based oxide contact materials are widely used in practice, among which silver tin oxide (AgSnO2) is most common. An attempt is made in increasing the performance of AgSnO2, by adding Tungsten Oxide (WO3) in various weight proportions, thus finding the optimal proportion of AgSnO2WO3 to have increased mechanical and electrical performances. All the composite samples are fabricated in-house using powder metallurgy process. The assessment of physical and electrical properties namely, density, hardness, porosity, and electrical conductivity, showed that 90%Ag-8.5%SnO2-1.5%WO3 composite yielded superior results. With help of morphological tests, wear characteristics are also investigated, which showed that 90%Ag-8.5%SnO2-1.5%WO2 composite has a wear coefficient of 0.000227 and a coefficient of friction of 0.174 at an optimized load of 10 N and sliding velocity of 0.5 mm/s.
Źródło:: Archives of Metallurgy and Materials; 2021, 66, 4; 1087-1094
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Influence of Co2 on the Catalytic Performance Of La2O3/CeO2 and CaO/CeO2 Catalysts in the Oxidative Coupling of Methane
Autorzy:: Litawa, B.
Michorczyk, P.
Ogonowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/779348.pdf
Data publikacji:: 2013
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: CO2 effect
OCM
lanthanum oxide
calcium oxide
ethylene
Opis:: In this work the La2O3/CeO2 (33 mol % of La) and CaO/CeO2 (33 mol % of Ca) catalysts were prepared by the impregnation method and characterized by XRD and CO2-TPD. The catalytic properties of the catalysts were tested in the OCM process at 1073 K using the methane/oxygen mixture of the mole ratio 3.7 or 2.5 additionally containing CO2 and helium balance. It was found that in the presence of both catalysts an addition of CO2 enhances the selectivity to the ethylene and ethane and it does not have Any negative infl uence on methane conversion. In the case of the CaO/CeO2 catalyst the promoting effect of CO2 was the highest. When the partial pressure of CO2 equals to 39 kPa the increase in selectivity from 36 to 41% was noted while the conversion of methane equal to 19.4-19.7 %.
Źródło:: Polish Journal of Chemical Technology; 2013, 15, 1; 22-26
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Effect of Rhenium Addition on Microstructures and Mechanical Properties of Oxide Dispersion Strengthened Ferrtic Steels
Autorzy:: Noh, Sanghoon
Kang, Suk Hoon
Kim, Tae Kyu
Powiązania:: https://bibliotekanauki.pl/articles/354176.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: oxide dispersion strengthened steel
rhenium
oxide particles
tensile
creep
Opis:: In this study, to investigate effects of rhenium addition on the microstructures and mechanical properties, 15Cr-1Mo ODS ferritic steels with rhenium additions were fabricated by the mechanical alloying, hot isostatic pressing, and hot rolling processes. Unremarkable differences on grain morphologies and nano-oxide distributions were estimated in the microstructure observations. However, the ODS ferritic steels with 0.5 wt.% rhenium showed higher tensile and creep strengths at elevated temperature than that without rhenium. It was found that rhenium is very effective to improve the mechanical properties.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 4; 1261-1264
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Microstructures and Mechanical Properties of ODS Ferritic Stainless Steels for High Temperature Service Applications
Autorzy:: Noh, Sanghoon
Kang, Suk Hoon
Kim, Tae Kyu
Powiązania:: https://bibliotekanauki.pl/articles/355864.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: stainless steel
oxide dispersion strengthening
oxide particles
tensile strength
Opis:: In this study, ODS ferritic stainless steels were fabricated using a commercial alloy powder, and their microstructures and mechanical properties were studied to develop the advanced structural materials for high temperature service applications. Mechanical alloying and uniaxial hot pressing processes were employed to produce the ODS ferritic stainless steels. It was revealed that oxide particles in the ODS stainless steels were composed of Y-Si-O, Y-Ti-Si-O, and Y-Hf-Si-O complex oxides were observed depending on minor alloying elements, Ti and Hf. The ODS ferritic stainless steel with a Hf addition presented ultra-fine grains with uniform distributions of fine complex oxide particles which located in grains and on the grain boundaries. These favorable microstructures led to superior tensile properties than commercial stainless steel and ODS ferritic steel with Ti addition at elevated temperature.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 3; 921-924
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Surface oxide layers with an increased carbon content for applications in oil-less tribological systems
Autorzy:: Kmita, T.
Bara, M.
Powiązania:: https://bibliotekanauki.pl/articles/185636.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: tribologia
surface oxide layer
composite surface oxide layer
tribology
Opis:: The paper presents the properties of surface oxide layers with an increased content of carbon for tribological applications. The composite surface oxide layers were produced using a two-step technology through hard anodising of the surface of an aluminium alloy, followed by thermochemical treatment of anodic oxide coatings. The surface oxide layers were subjected to tribological tests in an oil-less sliding couple with T5W plastic. The presented test results confirm the usefulness of the proposed modifications of surface oxide layers for the purpose of enhancing the operational durability of oil-less sliding couples in a reciprocating motion.
Źródło:: Chemical and Process Engineering; 2012, 33, 3; 479-486
0208-6425
2300-1925
Pojawia się w:: Chemical and Process Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 16.

Tytuł:: Composition and Optical Dispersion Characterization of Nanoparticles ZnO-NiO Thin Films: Effect of Annealing Temperature
Autorzy:: Oboudi, S.F.
Habubi, N.F.
Mohamed, G.H.
Chiad, S.S.
Powiązania:: https://bibliotekanauki.pl/articles/412573.pdf
Data publikacji:: 2013
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: TCOs
Dispersion parameters
Thermal evaporation
zinc oxide
Nickel Oxide
Opis:: Thin films of ZnO0.7NiO0.3 have deposited on glass substrates at room temperature by using thermal evaporation technique under vacuum 10-5 mbar. The optical properties and dispersion parameters of the films have been studied. Changes in direct optical energy band gap of films were confirmed before and after annealing. The optical energy gap Eg decreased from 3.11 to 2.86 eV with increasing of annealing temperature to 200 ºC. Some of the optical absorption parameters, such as optical dispersion energies Eo and Ed, Urbach tails EU , dielectric constant ε, the average values of oscillator strength So, and wavelength of single oscillator λo have been reported. An increase in the annealing temperature causes an increase in the average oscillator strength from 62.02 to 87.71 eV.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2013, 8, 1; 78-86
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 17.

Tytuł:: Modification of graphene oxide and reduced graphene oxide with inorganic nanoparticles
Autorzy:: Jagiełło, J.
Baran, M.
Lipińska, L.
Powiązania:: https://bibliotekanauki.pl/articles/284372.pdf
Data publikacji:: 2018
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: graphene
oxide
nanoparticles
Źródło:: Engineering of Biomaterials; 2018, 21, 148; 50
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 18.

Tytuł:: Badanie wpływu wybranych tlenków metali na możliwość modyfikacji barwy ceramicznej farby purpurowej
Examination of selected metal oxides’ effect on the possibility of modifying the color of purple ceramic paint
Autorzy:: Karaś, A.
Chmielewska, D.
Synowiec, B.
Powiązania:: https://bibliotekanauki.pl/articles/168772.pdf
Data publikacji:: 2016
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:: purpura Kasjusza
ceramiczna farba purpurowa
barwa
tlenek srebra
tlenek chromu
tlenek miedzi
tlenek indu
tlenek itru
tlenek kobaltu
Purple of Cassius
ceramic purple colour
colour
silver oxide
chromium oxide
cupric oxide
indium oxide
yttrium oxide
cobalt oxide
Opis:: Ceramiczna farba purpurowa składa się z pigmentu nieorganicznego Purpury Kasjusza i odpowiednio dobranego topnika. Farba znajduje szerokie zastosowanie w zdobieniu porcelany zarówno w technice malarskiej, jak i w technice sitodruku pośredniego (kalki ceramicznej). Przeprowadzone badania miały na celu ustalenie wpływu domieszek tlenków metali na możliwość uzyskiwania różnych odcieni barwy purpurowej i fioletowej. Do ceramicznej farby purpurowej na bazie bezołowiowego topnika, na różnych etapach jej wytwarzania, dodawano następujące tlenki metali: tlenek srebra Ag₂O, tlenek chromu Cr₂O₃, tlenek miedzi CuO, tlenek indu In₂O₃, tlenek itru Y₂O₃, tlenek kobaltu Co₃O₄ i określano parametry barwy L*a*b* uzyskanych farb w stosunku do farby wzorcowej, bez żadnych dodatków. W wyniku przeprowadzonych badań wykazano, że stosując domieszkowanie tlenkami metali na różnych etapach wytwarzania farby purpurowej, można uzyskać różne odcienie purpury i fioletu, a przy modyfikacji barwy farby ważny jest również etap dodawania domieszek.
Ceramic purple colour consists of Purple of Cassius inorganic pigment and properly chosen flux. The colour is widely used for decoration of porcelain both in painting technique as well as in technique of indirect screen printing (decal). The aim of the carried out tests was to settle influence of metal oxides’ admixtures upon possibility of obtaining various shades of purple and violet colour. The following metal oxides were being added to the ceramic purple colour on the base of its leadless flux, at various stages of its manufacturing: silver oxide Ag₂O, chromium oxide Cr₂O₃, cupric oxide CuO, indium oxide In₂O₃, yttrium oxide Y₂O₃, cobaltic oxide Co₃O₄ and parameters of colour L*a*b* of the obtained colours were defined comparing to the pattern colour, without any admixtures. As the result of the carried out tests it was shown, that performing admixtures of metal oxide at different stages of purple colour’s manufacturing, various shades of purple and violet can be obtained, and during modification of colour the stage of admixtures’ addition is important as well.
Źródło:: Szkło i Ceramika; 2016, R. 67, nr 6, 6; 15-18
0039-8144
Pojawia się w:: Szkło i Ceramika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 19.

Tytuł:: Anode Modification with Reduced Graphene Oxide–Iron Oxide Improves Electricity Generation in Microbial Fuel Cell
Autorzy:: Nosek, Dawid
Cydzik-Kwiatkowska, Agnieszka
Powiązania:: https://bibliotekanauki.pl/articles/2202130.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: MFC
reduced graphene oxide
iron(III) oxide
electricity generation
wastewater
Opis:: In recent years, much research has focused on energy recovery from biomass as an alternative to fossil fuel usage. Microbial fuel cells (MFCs), which produce electricity via microbial decomposition of organic matter, are of great interest. The performance of an MFC depends on the electrode material; most often, carbon materials with good electrical conductivity and durability are used. To increase the power output of an MFC, the anode material can be modified to reduce the internal resistance and increase the anode surface area. Therefore, this study determined how modifying a carbon felt anode with reduced graphene oxide (rGO) and a combination of rGO with iron (III) oxide (rGO-Fe) affected electricity generation in an MFC fueled with wastewater. A mixed microbial consortium was used as the anode biocatalyst. The MFC-rGO-Fe produced significantly higher voltages than other cells (average 109.4 ± 75.1 mV in the cycle). Power density curves indicated that modifying the anode with rGO-Fe increased the power of the MFC to 4.5 mW/m2, 9.3- and 3.9-times higher than that of the control MFC and the MFC-rGO, respectively. Anode modification reduced the internal resistance of the cells from 1029 Ω in the control MFC to 370 and 290 Ω in the MFC-rGO and MFC-rGO-Fe, respectively. These results show that a mixture of rGO with iron (III) oxide positively affects electricity production and can be successfully used for anode modification in the MFCs fueled with wastewater.
Źródło:: Journal of Ecological Engineering; 2022, 23, 10; 147--153
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 20.

Tytuł:: Structure and Properties of Nanocomposite Nickel/Graphene Oxide Coatings Produced by Electrochemical Reduction Method
Autorzy:: Cieślak, G.
Trzaska, M.
Powiązania:: https://bibliotekanauki.pl/articles/354431.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: graphene oxide
nanocomposites
electrodeposition
nickel/graphene oxide coatings
corrosion tests
Opis:: The paper presents the results of research on nanocomposite nickel/graphene oxide (Ni/GO) coatings produced by electrochemical reduction method on a steel substrate. Discussed is the method of manufacturing composite coatings with nickel matrix and embedded graphene oxide flakes. For comparative purposes, the studies also included a nanocrystalline Ni coating without embedded graphene oxide flakes. Graphene oxide was characterized by Raman spectroscopy, infrared spectroscopy (FTIR) and transmission (TEM) and scanning (SEM) electron microscopy. Results of studies on the structure of nickel and composite Ni/GO coatings deposited in a bath containing different amount of graphene oxide are presented. The coatings were characterized by scanning electron microscopy, light microscopy, Raman spectroscopy and X-ray diffraction. The adhesion of the prepared coatings to the substrate was examined by the scratch method. The microhardness of the coatings was measured using the Vickers method on perpendicular cross-sections to the surface. Corrosion tests of the coatings were investigated using the potentiodynamic method. The influence of graphene oxide on the structure and properties of composite coatings deposited from baths with different content of graphene oxide was determined.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 4; 1479-1486
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 21.

Tytuł:: Research on the influence of parameters on hexafluoropropylene oxide oligomerization in the presence of complex amines
Autorzy:: Meissner, E.
Wróblewska, A.
Powiązania:: https://bibliotekanauki.pl/articles/777883.pdf
Data publikacji:: 2007
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: tlenek heksafluoropropylenu
oligomery tlenku heksafluoropropylenu
hexafluoropropylene oxide
oligomers of hexafluoropropylene oxide
Opis:: Oligomers of hexafluoropropylene oxide were tested as potential materials for obtaining various compounds with unique properties, of which most important are chemical and thermal resistance. Two basic parameters influence the oligomerization process of hexafluoropropylene oxide: the type of the catalyst and the type of the solvent. Other parameters such as temperature and pressure have significantly less influence. The influence of tertiary amines as catalyst, the type of the solvent, temperature, pressure and catalyst concentration were tested in the process of hexafluoropropylene oxide oligomerization.
Źródło:: Polish Journal of Chemical Technology; 2007, 9, 3; 98-100
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 22.

Tytuł:: Effect of nitric oxide on boar sperm motility, membrane integrity, and acrosomal status during semen storage
Autorzy:: Jovicić, M.
Pintus, E.
Fenclova, T.
Simonik, O.
Chmelikova, E.
Ros-Santaella, J. L.
Sedmikova, M.
Powiązania:: https://bibliotekanauki.pl/articles/2087766.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: boar spermatozoa
nitric oxide
nitric oxide synthases
NO donor
NOS inhibitor
Źródło:: Polish Journal of Veterinary Sciences; 2018, 21, 1; 73-82
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 23.

Tytuł:: Effect of Surfactant Types on the Size of Tin Oxide Nanoparticles
Autorzy:: Boran, F.
Çetinkaya, S.
Şahin, M.
Powiązania:: https://bibliotekanauki.pl/articles/1031632.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: nanoparticle
tin oxide
surfactant
Opis:: In this study, tin oxide (SnO₂) nanoparticles were synthesized by hydrothermal method in the presence of hydrazine and ammonia by adding surfactant for 12 h in a Teflon autoclave at 100°C reaction temperature. Tin(II) chloride hydrate as an inorganic precursor, hexadecyl trimethyl ammonium bromide (CTAB), and tetrapropyl ammonium bromide (TPAB) as cationic, and sodium dodecyl sulfonate (SDS) as anionic surfactants were used. The results showed that the size and shape of nanoparticles depended on the surfactant types. The nanoparticles sizes between 17.5 and 19.7 nm were obtained by changing types of surfactants. Synthesized tin oxide nanoparticles were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and the Fourier transform infrared spectroscopy.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 546-548
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 24.

Tytuł:: Preparation of functionalized graphene oxide coatings on gold
Autorzy:: Trzaskowski, M.
Ciach, T.
Powiązania:: https://bibliotekanauki.pl/articles/285667.pdf
Data publikacji:: 2016
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: gold
coatings
graphene oxide
Źródło:: Engineering of Biomaterials; 2016, 19, 138; 88
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 25.

Tytuł:: Applications of flake graphene in tissue engineering
Autorzy:: Lipińska, L.
Jagiełło, J.
Baran, M.
Kurp, K.
Powiązania:: https://bibliotekanauki.pl/articles/285746.pdf
Data publikacji:: 2018
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: graphene
tissue engineering
oxide
Źródło:: Engineering of Biomaterials; 2018, 21, 148; 51
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 26.

Tytuł:: Composite coatings of polylactide with graphene oxide and hydroxyapatite on titanium
Autorzy:: Torcuato, M. S.
Szaraniec, B.
Kąc, S.
Chłopek, J.
Powiązania:: https://bibliotekanauki.pl/articles/284150.pdf
Data publikacji:: 2018
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: coatings
graphene oxide
hydroxyapatite
Źródło:: Engineering of Biomaterials; 2018, 21, 148; 116
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 27.

Tytuł:: A successful operational initiative in copper oxide flotation: Sequential sulphidisation-flotation technique
Autorzy:: Asadi, Moharram
Soltani, Faraz
Mohammadi, Mohammad Reza Tavakoli
Khodadadi, Darban Ahmad
Abdollahy, Mahmoud
Powiązania:: https://bibliotekanauki.pl/articles/110770.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: copper oxide
sulphidisation
flotation
Opis:: One of the main challenges in the copper oxide processing industry is implementation of a flotation method to reduce operating costs. Sulphidising flotation is the most common used technique in which a sulphidisation agent is used to sulphidise the surface of the oxide minerals. In this research, the mentioned technique was used sequentially for the concentration of silicate-carbonate ore containing 3.1% Cu (malachite). The presence of 39% Cu in -38 μm size fraction (fine particles) of feed led to poor grades and recoveries in the initial tests. The addition of sodium sulfide and subsequent flotation at three sequential stages was identified as a successful operational initiative to solve this problem in the following tests. The dosages of 1500, 1567 and 100 g/Mg of sodium silicate, sodium sulfide and potassium amyl xanthate, respectively, the conditioning time of 5 min for sulphidisation and pH=9.72 were chosen as optimum operational conditions using central composite design (CCD) method of experiments design. The rougher concentrate with 9.28% grade and 81.15% recovery was obtained under these conditions. The grade of obtained concentrate was reached to 24% in the cleaner step. The total recovery of both steps was over 74%.
Źródło:: Physicochemical Problems of Mineral Processing; 2019, 55, 2; 356-369
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 28.

Tytuł:: Oligomerization of hexafluoropropylene oxide in the presence of alkali metal halides
Autorzy:: Meissner, E.
Wróblewska, A.
Powiązania:: https://bibliotekanauki.pl/articles/777879.pdf
Data publikacji:: 2007
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: tlenek heksafluoropropylenu
oligomeryzacja
oligomery tlenku heksafluoropropylenu
heksafluoropropylene oxide
oligomers of hexafluoropropylene oxide
Opis:: Oligomers of hexafluoropropylene oxide are raw materials for the synthesis of compounds having unique properties such as high chemical and thermal resistance. Two basic parameters have influence on the process of hexafluoropropylene oxide oligomerization: the kind of the catalyst and the solvent. The temperature and pressure influence this process to a lesser extent. The influence of halide ions, the solvent and the temperature on the oligomerization of hexafluoropropylene oxide has been studied.
Źródło:: Polish Journal of Chemical Technology; 2007, 9, 3; 95-97
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 29.

Tytuł:: Effect of oligochitosans on expression of inos gene in ehrlich ascites tumour in vitro
Autorzy:: Ignacak, Jan
Wiśniewska-Wrona, Maria
Dulińska-Litewka, Joanna
Pałka, Iwona
Zagajewski, Jacek
Niekraszewicz, Antoni
Powiązania:: https://bibliotekanauki.pl/articles/1035407.pdf
Data publikacji:: 2012
Wydawca:: Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:: chitosan oligomers
histone H1
iNOS (inducible nitric oxide synthase)
nitric oxide
Opis:: Oligochitosans obtained through degradation of macromolecules of chitosan with a high degree of deacetylation turned out to be biologically active, contributing to an increase of nitric oxide levels in Ehrlich ascites tumor (EAT) cells through inducing expression of the isoform of inducible nitric oxide synthase (iNOS) gene. An increase of NO levels in EAT cells in the presence of the investigated oligochitosans might contribute to nitrosylation of L-cysteine – an allosteric effector of the M2 isoenzyme of pyruvate kinase (PK), which switches the PK kinase activity, responsible for ATP synthesis, to the histone kinase activity that may participate in histone H1 phosphorylation. Lack of the histone activity of the PK M2 isoenzyme may contribute to decreased histone H1 phosphorylation and thus inhibit EAT cells proliferation.
Źródło:: Progress on Chemistry and Application of Chitin and its Derivatives; 2012, 17; 141-148
1896-5644
Pojawia się w:: Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 30.

Tytuł:: Microstructures and Tensile Properties of Fe-Cr-Al Oxide Dispersion Strengthened Ferritic Alloys for High Temperature Service Components
Autorzy:: Park, Minha
Bae, Jaeyoon
Kim, Byung-Jun
Kim, Bu-Ahn
Noh, Sanghoon
Powiązania:: https://bibliotekanauki.pl/articles/2203715.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Fe-Cr-Al
ferritic alloy
oxide dispersion strengthening
complex oxide
tensile strength
Opis:: In present study, Fe-22Cr-4.5Al oxide dispersion strengthened ferritic alloys were fabricated using a pre-alloyed powder with different minor alloying elements, and their microstructures and tensile properties were investigated to develop the advanced structural materials for high temperature service components. Planetary-typed mechanical alloying and uniaxial hot pressing processes were employed to fabricate the Fe-Cr-Al oxide dispersion strengthened ferritic alloys. Microstructural observation revealed that oxide dispersion strengthened ferritic alloys with Ti, Zr additions presented extremely fine micro-grains with a high number density of nano-scaled oxide particles which uniformly distributed in micro-grains and on the grain boundaries. These oxide particles were confirmed as a fine complex oxide, Y2Zr2O7. These favorable microstructures led to superior tensile properties than commercial ferritic stainless steel and oxide dispersion strengthened ferritic alloy with only Ti addition at elevated temperature.
Źródło:: Archives of Metallurgy and Materials; 2023, 68, 1; 85--88
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 31.

Tytuł:: Studies of physicochemical properties of graphite oxide and thermally exfoliated/reduced graphene oxide
Autorzy:: Drewniak, S. E.
Pustelny, T. P.
Muzyka, R.
Plis, A.
Powiązania:: https://bibliotekanauki.pl/articles/779581.pdf
Data publikacji:: 2015
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: graphite oxide
thermally exfoliated/reduced graphene oxide
topography investigations
Raman spectroscopy
elemental analysis
Opis:: The aim of the experimental research studies was to determine some electrical properties of graphite oxide and thermally exfoliated/reduced graphene oxide. The authors tried to interpret the obtained physicochemical results. For that purpose, both resistance measurements and investigation studies were carried out in order to characterize the samples. The resistance was measured at various temperatures in the course of composition changes of gas atmospheres (which surround the samples). The studies were also supported by such methods as: scanning electron microscopy (SEM), Raman spectroscopy (RS), atomic force microscopy (AFM) and thermogravimetry (TG). Moreover, during the experiments also the elemental analyses (EA) of the tested samples (graphite oxide and thermally exfoliated/reduced graphene oxide) were performed.
Źródło:: Polish Journal of Chemical Technology; 2015, 17, 4; 109-114
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 32.

Tytuł:: Analysis of chemical and phase composition of copper oxide prepared by direct current sputtering for photovoltaic applications
Autorzy:: Sawicka-Chudy, P.
Wielgosz, M.
Wal, A.
Cieniek, B.
Wisz, G.
Głowa, Ł.
Cholewa, M.
Sawicka, J.
Powiązania:: https://bibliotekanauki.pl/articles/101735.pdf
Data publikacji:: 2018
Wydawca:: Instytut Polityki Energetycznej im. Ignacego Łukasiewicza
Tematy:: XRF
XRD
copper oxide
photovoltaics
Opis:: This paper presents the application of X-ray fluorescence and X-ray diffraction methods for the study of copper oxide structures as an absorber layer in thin-film solar cells. The layers of copper oxide were applied by direct current magnetron sputtering. Quantitative and qualitative analysis of oxide layers were performed using XRF (X-ray fluorescence). The studies showed a high copper content in both samples, amounting to 98% and 96%, as well as trace amounts of other elements (nickel, lead). The XRD (X-ray diffraction) study showed Cu₂0 and Cu₈O phases, amorphism ranging from 24% to 44%, and crystallinity from 55% to 75%. Crystallites of 30 nm were also determined. The aim of the study was to determine the chemical and phase composition of the layers obtained and to determine the degree of their contamination depending on the parameters of the manufacturing technology in terms of their application in photovoltaics. One of the samples showed an advantage both in terms of material and structural composition.
Źródło:: Energy Policy Studies; 2018, 1 (2); 3-11
2545-0859
Pojawia się w:: Energy Policy Studies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 33.

Tytuł:: Graphene and graphene oxide in the oil and gas industry
Autorzy:: Jamrozik, A.
Powiązania:: https://bibliotekanauki.pl/articles/299253.pdf
Data publikacji:: 2017
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: drilling
nanotechnologies
graphene
graphene oxide
Opis:: Presently, nanotechnology and nanomaterials have found a number of applications in drilling, exploration and production (E&P) works, as well as in the area of refinery and distribution of crude oil and natural gas. Nanomaterials enjoy considerable popularity owing to their new and unique features which differentiate them from classical materials. Graphene is a relatively new material. Currently it occupies the seventh position among the most commonly used nanomaterials in oil and gas industry. This paper presents the properties graphene and graphene oxide and gives an insight into the applicability of graphene and graphene oxide in the oil and gas industry.
Źródło:: AGH Drilling, Oil, Gas; 2017, 34, 3; 731-744
2299-4157
2300-7052
Pojawia się w:: AGH Drilling, Oil, Gas
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 34.

Tytuł:: Cytotoxic effect of nitric oxide on human hematological malignant cells.
Autorzy:: Tsumori, Michihiro
Tanaka, Junko
Koshimura, Kunio
Kawaguchi, Mikiko
Murakami, Yoshio
Kato, Yuzuru
Powiązania:: https://bibliotekanauki.pl/articles/1043819.pdf
Data publikacji:: 2002
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: lymphoma
myeloma
leukemia
nitric oxide
Opis:: We investigated the cytotoxic effect of nitric oxide (NO) on primary culture of human hematological malignant cells. Sodium nitroprusside (SNP), an NO donor, had cytotoxic effects on the cells of some patients with malignant lymphoma (ML), acute myelocytic leukemia (AML) or chronic myelomonocytic leukemia (CMMoL), but not with multiple myeloma. Cultured cells from the ML patient remained sensitive to SNP after the cells became resistant to anti-cancer drugs. In contrast, the cells from the patients with AML and CMMoL became resistant to SNP while anti-cancer drugs remained effective. In samples of the cells of the patients with ML and AML, the number of CD3 positive lymphoma cell was decreased by SNP and the number of CD33 negative cells and normal B lymphocytes (CD19 positive cells) were increased. In the cells of the patient with ML, apoptosis was induced by SNP. SNP had no effect on lymphocytes of healthy volunteers. These results suggest that SNP had an anti-tumor effect on human hematological malignant cells.
Źródło:: Acta Biochimica Polonica; 2002, 49, 1; 139-144
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 35.

Tytuł:: Superparamagnetic iron oxide nanoparticles as versatile drug delivery carriers
Autorzy:: Reczyńska, K.
Marszałek, M.
Zarzycki, A.
Reczyński, W.
Chrzanowski, W.
Pamuła, E.
Powiązania:: https://bibliotekanauki.pl/articles/284204.pdf
Data publikacji:: 2018
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: nanoparticles
iron oxide
silica coating
Źródło:: Engineering of Biomaterials; 2018, 21, 148; 104
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 36.

Tytuł:: A narrative review on inhaled nitric oxide to treat Coronavirus Disease 2019.
Autorzy:: Romanelli, Antonio
De Rosa, Rosanna Carmela
Powiązania:: https://bibliotekanauki.pl/articles/2054912.pdf
Data publikacji:: 2022-06-30
Wydawca:: Towarzystwo Pomocy Doraźnej
Tematy:: COVID-19
cARDS
nitric oxide
Opis:: COVID-19-associated ARDS (cARDS) results from multiple pathogenetic mechanisms involving both parenchyma and circulation of the lungs. Despite authors described two pneumonia phenotypes according to lung elastance values, reported as Low and High phenotype, the evidence suggests that patients with cARDS have similar respiratory mechanics to patients with ARDS from other causes. Consequently, the proper management of patients with cARDS is the same as ARDS,consisting of protective mechanical ventilation strategy and prone position ventilation.However, the hypothesis that impaired alveolar perfusion could have a role in cARDS is interesting. Nitric oxide (NO) is a biatomic gaseous moleculeables to induce smooth muscle relaxation and vasodilation. So, inhaled nitric oxide (iNO) acts as a selective vasodilator because it only dilates vessels in areas participating in gas exchange, preserving hypoxic pulmonary vasoconstriction reflex and reducing ventilation/perfusion mismatch. With this narrative review we summarised the role of iNO for cARDS treatment to improve gas exchange. Furthermore, we briefly described its activity as an antiviral agent. In conclusion, although iNO administration can represent a valid theoretical therapeutic choice for the treatment of severe unresponsive hypoxemia in COVID-19 patients, data presented in the literature are scares and inconclusive, and several clinical trials are still ongoing. Further studies are needed to elucidate the pathogenetic mechanism of respiratory failure related to SARS-CoV-2 infection and inhaled NO role in patients with severe disease.
Źródło:: Critical Care Innovations; 2022, 5, 2; 40-50
2545-2533
Pojawia się w:: Critical Care Innovations
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 37.

Tytuł:: Chitosan-based nanocomposites modified with reduced graphene oxide prepared via green synthesis
Autorzy:: Kosowska, K.
Domalik-Pyzik, P.
Jagiełło, J.
Lipińska, L.
Chłopek, J.
Powiązania:: https://bibliotekanauki.pl/articles/284680.pdf
Data publikacji:: 2017
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: nanocomposites
graphene oxide
green synthesis
Źródło:: Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 59
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 38.

Tytuł:: Receiver operating characteristic analysis of the FeNO biomarker in the diagnosis of asthma
Autorzy:: Biesiadecki, Marek
Galiniak, Sabina
Bartusik-Aebisher, Dorota
Aebisher, David
Powiązania:: https://bibliotekanauki.pl/articles/454725.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:: asthma
nitric oxide
ROC curve
Opis:: Introduction. The fraction of exhaled nitric oxide (FeNO) is used as a non-invasive biomarker that reflects inflammation in the airways. It is so versatile that it used to control asthma severity as well as to monitor response to treatment. However, the exact cut-off point of the nitric oxide level which allows one to make a precise diagnosis of asthma is unclear. Aim. To examine the possibility of using advanced statistical methods such as receiver operating characteristic for the analysis of FeNO concentrations for improving the diagnosis of asthma. Materials and methods. Receiver operating characteristic (ROC) was used for analyzing results to determine levels of nitric oxide which may be a prognostic indicator of asthma. The studied group consisted of 111 children including 69 asthmatic patients, and 42 age- and sex-matched healthy subjects. Measurement of exhaled nitric oxide was conducted in all subjects included in this study. Results. FeNO level was higher in asthmatic patients. The analysis of results showed that the cut-off point for the FeNO concentration is 11.5 ppb. Sensitivity and specificity with the FeNO level allowed us to determine a value of the diagnostic variable of FeNO concentration of 14.0 ppb. A comparison of FeNO level and sex of the subjects showed there is no correlation between these parameters of patients. Conclusions. Currently, the FeNO measurement provides complementary d
Źródło:: European Journal of Clinical and Experimental Medicine; 2018, 4; 253-258
2544-2406
2544-1361
Pojawia się w:: European Journal of Clinical and Experimental Medicine
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 39.

Tytuł:: Histochemical study of the nitric oxide synthase activity in experimental trichinellosis
Autorzy:: Hadas, E.
Gustowska, L.
Boczon, K.
Janczewska, D.
Powiązania:: https://bibliotekanauki.pl/articles/837102.pdf
Data publikacji:: 1998
Wydawca:: Polskie Towarzystwo Parazytologiczne
Tematy:: parasite
nitric oxide synthase
mouse
mice
trichinellosis
enzyme
nitric oxide
Trichinella spiralis
synthase activity
Źródło:: Annals of Parasitology; 1998, 44, 3
0043-5163
Pojawia się w:: Annals of Parasitology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 40.

Tytuł:: About the Optimal Ratio Inhibitor and Activators of Carbon Dioxide Sorption Process by Using Chlorophyll-synthesizing Chlorella microalgae
Autorzy:: Dyachok, Vasil
Mandryk, Solomiia
Huhlych, Serhiy
Powiązania:: https://bibliotekanauki.pl/articles/1838425.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: Chlorella microalgae
carbon dioxide
phosphorus oxide
nitrogen oxide
sulfur dioxide
inhibitor
activator
mathematical description
Opis:: The suppression of the inhibition effect by SO2 sulfur dioxide with the simultaneous action of two activators – P2O5 phosphorus oxide and NxOy nitrogen oxide, as well as the process of carbon dioxide absorption by chlorophyll-synthesizing microalgae Chlorella were studied in this work. The experimental dependences of the СО2 uptake dynamics by microalgae under the conditions of the SO2 inhibitor critical concentration action and the simultaneous presence of P2O5 and NxOy activators were shown. A mathematical description of the Chlorella microalgae biomass growth depending on the P2O5 and NxOy activators concentration, provided that there is a SO2 inhibitor constant concentration was obtained. The optimum values of the P2O5 phosphorus oxide and NxOy nitrogen oxides concentration at the SO2 inhibitor critical concentration for the carbon dioxide absorption by chlorophyll-synthesizing microalgae Chlorella process were established.
Źródło:: Journal of Ecological Engineering; 2021, 22, 5; 26-31
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 41.

Tytuł:: A Study on the Recovery of Lithium and Ni/Co oxide from Cathode Active Powder of End-of-Life NCA(LiNiCoAlO2) Battery
Autorzy:: Shin, Shun-Myung
Shin, Dong-Ju
Joo, Sung-Ho
Wang, Jei-Pil
Powiązania:: https://bibliotekanauki.pl/articles/352178.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: cathode active powder
NCA(LiNiCoAlO2)
Li2CO3
nickel oxide
cobalt oxide
Opis:: This study was attempted to study for recovery of Li as Li₂CO₃ from cathode active material, especially NCA (LiNiCoAlO₂), recovered from spent lithium ion batteries. This consists of two major processes, carbonation using CO₂ and water leaching. Carbonation using CO₂ was performed at 600ºC, 700ºC and 800ºC, and NCA (LiNiCoAlO2) was phase-separated into Li₂CO₃, NiO and CoO. The water leaching process using the differences in solubility was performed to obtain the optimum conditions by using the washing time and the ratio of the sample to the distilled water as variables. As a result, NCA (LiNiCoAlO₂) was phase-separated into Li₂CO₃ and NiO, CoO at 700ºC, and Li₂CO₃ in water was recovered through vacuum filtration after 1 hour at a 1:30 weight ratio of the powder and distilled water. Finally, Li₂CO₃ containing Li of more than 98 wt.% was recovered.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 2; 481-485
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 42.

Tytuł:: Joining Of Green Body And Dense Substrate For Indium Tin Oxide Under Uniaxial Pressure In An Open Condition
Łączenie zielonej masy i gęstego podłoża z tlenku cyny indu w warunkach jednoosiowego ściskania w stanie otwartym
Autorzy:: Moon, G.-S.
Chung, T.-J.
Yang, S. H.
Hong, G.-S.
Oh, K.-S.
Powiązania:: https://bibliotekanauki.pl/articles/355654.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: transparent conducting oxide
indium tin oxide
green body
joining
tlenek indu
zielona masa
łączenie
Opis:: The green body and dense substrate of indium tin oxide was joined by uniaxially pressing at 0.3 MPa at 1300°C to test the restoring of the eroded part of transparent conducting oxide target. The green body was sintered to 98% of theoretical density under the suppression of shrinkage along the boundary below 5%. The boundary between two parts was free of pore but could be recognized from the difference in grain sizes. The joined part had the virtually same density with the substrate, but the grain size was less than one fifth compared with that of substrate.
Źródło:: Archives of Metallurgy and Materials; 2015, 60, 2B; 1209-1212
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 43.

Tytuł:: Allelic polymorphism of endothelial NO-synthase gene and its functional manifestations
Autorzy:: Dosenko, Victor
Zagoriy, Vyacheslav
Haytovich, Nikolay
Gordok, Olga
Moibenko, Alexey
Powiązania:: https://bibliotekanauki.pl/articles/1041240.pdf
Data publikacji:: 2006
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: activity of nitric oxide synthase
endothelial nitric oxide synthase
RNA expression
platelets
allelic polymorphism
Opis:: Investigation of the mechanisms of phenotypic realization of allelic polymorphism of the eNOS gene has shown that the level of eNOS mRNA and activity of this enzyme in platelets depends from genotype. We identified a T-786→C polymorphism in the promoter region, a variable number of tandem repeats (4a/4b) in intron 4 and the G894→T polymorphism in exon 7 of the eNOS gene in isolated human platelets. We measured eNOS mRNA in isolated platelets by reverse transcription-PCR and eNOS enzyme activity by fluorimetric detection system FCANOS-1 using diaminofluorescein diacetate (DAF-2A). It was shown that the level of eNOS mRNA is the lowest for the -786C/C promoter genotype. In exon 7 homozygotes (894T/T) the level of RNA is lower than in normal homozygotes (894G/G), but higher than in heterozygotes (894G/T). The eNOS activity in platelets is lower in carriers of the 786C/C promoter genotype than in normal homozygotes (2.1 × P=0.03), and lower comparing to heterozygotes (2.9 × P>0.05). The eNOS activity accompanying the 894T/T variant of exon 7 is also lower than in normal homozygotes (P>0.05). Regarding the polymorphism in intron 4 - the enzyme's activity is lower in carriers of the 4a/4a genotype comparing to normal homozygotes (1.7 × P>0.05) and lower than in heterozygotes (1.9 × P>0.05). These results allow one to conclude that the T-786→C polymorphism of the eNOS gene promoter most significantly affects the gene expression and eNOS activity.
Źródło:: Acta Biochimica Polonica; 2006, 53, 2; 299-302
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 44.

Tytuł:: An application of butanol as a diesel fuel component and its influence on exhaust emissions
Autorzy:: Kozak, M.
Powiązania:: https://bibliotekanauki.pl/articles/792035.pdf
Data publikacji:: 2011
Wydawca:: Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:: diesel engine
exhaust emission
diesel fuel
n-butanol
smoke emission
oxygenation
nitric oxide
carbon oxide
Opis:: The influence of oxygenated diesel fuel containing n-butanol on a passenger car exhaust emissions was tested over the NEDC transient cycle. The tests showed that a diesel fuel/butanol blend, containing 10% of n-butanol, caused a significant decrease in PM and smoke emissions, had no effect on NOx and CO2 emissions and brought about higher CO and HC emissions. The most favourable fact resulting from the butanol application as diesel fuel component is that it produces desirable changes in PM/NOx trade-off.
Źródło:: Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11C
1641-7739
Pojawia się w:: Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 45.

Tytuł:: Growth Temperature Effect of Atomic-Layer-Deposited GdOx Films
Autorzy:: Ryu, Sung Yeon
Yun, Hee Ju
Lee, Min Hwan
Choi, Byung Joon
Powiązania:: https://bibliotekanauki.pl/articles/2049285.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: gadolinium oxide
Gd2O3
rare-earth oxide
atomic layer deposition
hydrophobicity
electrical property
Opis:: Gadolinium oxide (Gd2O3) is one of the lanthanide rare-earth oxides, which has been extensively studied due to its versatile functionalities, such as a high permittivity, reactivity with moisture, and ionic conductivity, etc. In this work, GdOx thin film was grown by atomic layer deposition using cyclopentadienyl (Cp)-based Gd precursor and water. As-grown GdOx film was amorphous and had a sub-stoichiometric (x ~ 1.2) composition with a uniform elemental depth profile. ~3 nm-thick GdOx thin film could modify the hydrophilic Si substrate into hydrophobic surface with water wetting angle of 70°. Wetting and electrical test revealed that the growth temperature affects the hydrophobicity and electrical strength of the as-grown GdOx film.
Źródło:: Archives of Metallurgy and Materials; 2021, 66, 3; 755-758
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 46.

Tytuł:: Gas Transmitters (CO and NO) as Factors Regulating the Skin Cells Functions
Autorzy:: KOZIOROWSKA, ANNA
ROMEROWICZ-MISIELAK, MARIA
Powiązania:: https://bibliotekanauki.pl/articles/455157.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Rzeszowski
Tematy:: Cells viability
Carbon monoxide
Nitric oxide
Opis:: The paper presents the results of research conducted on cells isolated from the epidermal layer of the skin taken from the ear of domestic swine (Sus scrofa). It was checked whether the increase in the concentration of carbon monoxide (CO) in cell culture, cause changes in their viability, and will affect the changes in the production of nitric oxide. For evaluation of the viability of cells, the MTT assay was used. The concentration of a nitric oxide metabolites (NO3/NO2), in the cell supernatants was measured using test-Measure iT High-Sensitivity Nitrite Assay Kit.
Źródło:: Edukacja-Technika-Informatyka; 2017, 8, 1; 131-136
2080-9069
Pojawia się w:: Edukacja-Technika-Informatyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 47.

Tytuł:: ZnO dla fotowoltaiki
ZnO for Photovoltaics
Autorzy:: Godlewski, M.
Łuka, G.
Pietruszka, R.
Wachnicki, Ł.
Witkowski, B.
Powiązania:: https://bibliotekanauki.pl/articles/159146.pdf
Data publikacji:: 2014
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:: fotowoltaika
tlenek cynku
photovoltaics
zinc oxide
Opis:: Mimo znaczącej redukcji kosztów paneli fotowoltaicznych (PV), cena energii wytwarzanej przez baterie słoneczne ciągle jest za wysoka. Możliwe są dwie strategie rozwiązania tej sytuacji – (a) podniesienie wydajności konwersji światła w komórkach fotowoltaicznych lub/i (b) obniżenie kosztów paneli PV poprzez zastosowanie tańszych materiałów lub technologii. W referacie omówione są prace mające na celu: (a) zastąpienie zbyt drogiego ITO warstwami ZnO o przewodnictwie metalicznym, (b) uproszczenie konstrukcji komórek PV oraz (c) znalezienie alternatywnych materiałów.
Despite of a large reductions of costs energy produced by solar panels is still too expensive. There are two approaches to change this situation: by (a) increase of device output and/or (b) reduction of device costs by use of cheaper alternative materials. In this article we discuss the latter approach – (a) replacement of ITO by ZnO with metallic conductivity, (b) change of device architecture, and (c) use of alternative materials.
Źródło:: Prace Instytutu Elektrotechniki; 2014, 264; 5-13
0032-6216
Pojawia się w:: Prace Instytutu Elektrotechniki
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 48.

Tytuł:: Synthesis, Characterization and Sensing Behavior of WO₃ Nanocrystalline Powder for Toluene Vapor
Autorzy:: Boran, F.
Çetinkaya, S.
Powiązania:: https://bibliotekanauki.pl/articles/1031559.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: tungsten oxide
direct precipitation technique
toluene
Opis:: Tungsten oxide (WO₃) nanocrystalline powder was successfully synthesized by direct precipitation technique starting from sodium tungstate dehydrate (Na₂WO₄·2H₂O) as precursor at 80°C for 48 h. The morphological characteristics, distribution, and crystallite size of WO₃ nanocrystalline powder were analysed by transmission electron microscopy, X-ray diffraction, and the Fourier transform infrared spectroscopy. According to transmission electron microscopy results, the mean particle size of WO₃ nanocrystalline powder was approximately determined as 41.7 nm. The gas sensing performance of WO₃ nanocrystalline powder for saturated toluene vapor was measured by two probe resistivity unit in a closed vessel at room temperature. In addition, WO₃ nanocrystalline powder was able to respond the lowest concentration of 500 ppm. The results showed that the sample exhibited high sensitivity (93%) and good response reproducibility (0.93+5.5%) for toluene vapor.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 572-573
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 49.

Tytuł:: Nanocomposite Sulfonated PVDF-TiO2 Membranes as a Potential Alternative for Nafion
Autorzy:: Juliandri, Juliandri
Rukiah, Rukiah
Ernawati, E. E.
Handika, R. S.
Nasir, M.
Powiązania:: https://bibliotekanauki.pl/articles/1165508.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: PVDF membrane
conductivity
nanocomposites
titanium oxide
Opis:: Fuel cell is an alternative renewable energy source which potentially able to replace a fossil fuel. Nowadays, common fuel cell membrane generally used is Nafion. PVDF polymer is another synthetic polymer which has excellent physical and chemical properties. The purpose of this research is to synthesize an alternative fuel cell membrane, using sulfonated PVDF doped with TiO2 nanoparticles. Sol-gel method was performed to synthesize TiO2 nanoparticles, with TiCl4 as precursor. PVDF membranes with variation of TiO2 composition (0, 1, 1.5, and 2%) were prepared with ultrasonic method. The composite membranes then were sulfonated with concentrated sulfuric acid. The composite membranes were characterized with FTIR for functional group analysis, SEM-EDX for morphology analysis, acid-base titration for degree of sulfonation, weight difference for degree of water uptake, and four point lines for conductivity. FTIR spectra of the sulfonated membrane show the existence of sulfonic group at wavenumber of 601, 1400, and 1454 cm-1. The result of SEM-EDX analysis shows that the nanoparticles of TiO2 were not distributed homogenously. Degree of sulfonation of the PVDF-TiO2 2% composite membrane is 19.54%, and its water uptake is 23.34%. The highest conductivity is about 3.17 × 10-3 S cm-1 for the PVDF-TiO2 2% composite membrane that is very close to Nafion’s conductivity, 6.08 × 10-3 S cm-1.
Źródło:: World Scientific News; 2018, 107; 150-159
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:: Equilibrium and kinetics studies for the adsorption of Ni2+ and Fe3+ ions from aqueous solution by graphene oxide
Autorzy:: Konicki, W.
Aleksandrzak, M.
Mijowska, E.
Powiązania:: https://bibliotekanauki.pl/articles/778711.pdf
Data publikacji:: 2017
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: nickel
iron
graphene oxide
adsorption
kinetics
Opis:: In this study, the adsorption of Ni²⁺ and Fe³⁺ metal ions from aqueous solutions onto graphene oxide (GO) have been explored. The effects of various experimental factors such as pH of the solution, initial metal ion concentration and temperature were evaluated. The kinetic, equilibrium and thermodynamic studies were also investigated. The adsorption rate data were analyzed using the pseudo-first-order kinetic model, the pseudo-second-order kinetic model and the intraparticle diffusion model. Kinetic studies indicate that the adsorption of both ions follows the pseudo-second-order kinetics. The isotherms of adsorption data were analyzed by adsorption isotherm models such as Langmuir and Freundlich. Equilibrium data fitted well with the Langmuir model. The maximum adsorption capacities of Ni²⁺ and Fe³⁺ onto GO were 35.6 and 27.3 mg g^-1 , respectively. In addition, various thermodynamic parameters, such as enthalpy (ΔHO), entropy (ΔSO) and Gibbs free energy (ΔGO), were calculated.
Źródło:: Polish Journal of Chemical Technology; 2017, 19, 3; 120-129
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 51.

Tytuł:: The activity of fused-iron catalyst doped with lithium oxide for ammonia synthesis
Autorzy:: Jedrzejewski, R.
Lendzion-Bieluń, Z.
Arabczyk, W.
Powiązania:: https://bibliotekanauki.pl/articles/779518.pdf
Data publikacji:: 2016
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: iron catalyst
ammonia synthesis
lithium oxide
Opis:: The iron catalyst precursor promoted with Al2O3, CaO, and Li2O was obtained applying the fusing method. Lithium oxide forms two phases in this iron catalyst: a chemical compound with iron oxide (Li2Fe3O4) and a solid solution with magnetite. The catalyst promoted with lithium oxide was not fully reduced at 773 K, while the catalyst containing potassium was easily reducible at the same conditions. After reduction at 873 K the activity of the catalyst promoted with lithium oxide was 41% higher per surface than the activity of the catalyst promoted with potassium oxide. The concentration of free active sites on the surface of the catalyst containing lithium oxide after full reduction was greater than the concentration of free active sites on the surface of the catalyst promoted with potassium oxide.
Źródło:: Polish Journal of Chemical Technology; 2016, 18, 2; 78-83
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 52.

Tytuł:: Methane and Nitrous Oxide Emissions from Agriculture on a Regional Scale
Autorzy:: Wysocka-Czubaszek, A.
Czubaszek, R.
Roj-Rojewski, S.
Banaszuk, P.
Powiązania:: https://bibliotekanauki.pl/articles/124407.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: methane emissions
nitrous oxide emissions
agriculture
Opis:: Nowadays, agriculture has to meet the growing food demand together with high requirements of environmental protection, especially regarding the climate change. The greenhouse gas emissions differ not only on a global, but also on a regional scale, and mitigation strategies are effective when they are adapted properly. Therefore, the aim of this paper is to present the results of methane (CH₄) and nitrous oxide (N₂O) emissions inventory on a regional level in Poland in years 1999-2015. The CH₄ and N₂O emissions were calculated according to the methodology used by the National Centre for Emissions Management (NCEM) for national inventory for United Nations Framework Convention on Climate Change and Kyoto Protocol. The data were taken from Central Statistical Office of Poland. The CH₄ emissions in all studied years varied strongly between voivodeships and ranged from 5.6-7.5 Gg y^-1 in the Lubuskie Voivodeship to 84.8-104.3 Gg y^-1 in the Mazowieckie Voivodeship. While in most voivodeships the CH₄ emissions dropped down, in Podlaskie, Warmińsko-Mazurskie, and Wielkopolskie voivodeships, the emissions of this gas increased significantly as a consequence of the development of dairy and meat production. In 1999, the highest N₂O fluxes were calculated for the Wielkopolskie (5.7 Gg y-1), Mazowieckie (4.8 Gg y^-1) Kujawsko-Pomorskie (3.5 Gg y^-1) and Lubelskie (3.3 Gg y^-1) voivodeships, while in 2015, the highest nitrous oxide emissions were calculated for the Wielkopolskie (7.3 Gg y^-1), Mazowieckie (5.5 Gg y^-1), Kujawsko-Pomorskie (4.1 Gg y^-1) and Podlaskie (4.1 Gg y^-1) voivodeships. In the studied period, the contribution of N₂O emissions from crop production increased in almost all voivodeships except the Podlaskie, Lubuskie and Warmińsko-Mazurskie regions. The growth in emissions from mineral fertilization and crop residue incorporation, together with the increase of emission from the animal sector in some regions of Poland, resulted in the higher national emission of nitrous oxide in the period of 1999 to 2015. Although there is a range of GHG reduction possibilities, the mitigation should be adapted with caution, on the basis of precisely calculated GHG emissions. The best management practices, if followed carefully, may reduce the environmental burden of the agricultural production and enhance its profitability.
Źródło:: Journal of Ecological Engineering; 2018, 19, 3; 206-217
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 53.

Tytuł:: Obtaining and Application of New Cellulose- and Graphene Oxide-Based Adsorbents for Treatment of Industrial Waste Containing Heavy Metals
Autorzy:: Fryczkowska, B.
Wyszomirski, M.
Puzoń, M.
Powiązania:: https://bibliotekanauki.pl/articles/125232.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: cellulose
graphene oxide
sorption
galvanizing wastewater
Opis:: The paper presents the results of studies on the preparation and properties of composite granules produced by phase inversion from cellulose (CEL) solutions in 1-ethyl-3-methylimidazole acetate (EMIMAc), containing nano-addition in the form of graphene oxide (GO) in N,N-dimethylformamide (DMF). Water absorption and sorption of such compounds as FeCl₃, methylene blue (MB) and bovine serum albumin (BSA) were studied. In addition, attempts were made to investigate the sorption properties of the obtained cellulose granules in terms of metals removal from galvanizing wastewater. Among the many components, iron and lead were found to have the highest concentration (~ 1 mg Fe/dm³; ~2 mg Pb/dm³) in the tested wastewater sample. The qualitative and quantitative composition of the wastewater was examined by UV-Vis spectrophotometry. The studies show that doping of cellulose with Graphene oxide clearly affects the physical properties of this biopolymer. GO improves the water absorption of CEL/GO composite cellulose granules only in the concentration above 0.05% w/w. For a concentration of 0.1% w/w of GO in cellulose, water absorption is increased by ~108% compared to pure cellulose granules. In addition, the use of dry and wet granules in the study changes their sorption properties with respect to all tested substances. Studies on test solutions have shown that the sorption of cellulose granules decreases with increasing molar mass of test compounds, in the following order: FeCl₃, methylene blue (MB) and bovine albumin (BSA). This means that the cellulose granules obtained in the experiment are made up of small micropores, which makes the diffusion of compounds of high molecular weight difficult. The best sorption results were obtained for ferric ions and amounted to 66–72% for FeCl₃ solution, and ~92% for the wastewater that was sorbed on pure cellulose granules.
Źródło:: Journal of Ecological Engineering; 2017, 18, 6; 43-52
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 54.

Tytuł:: Transparent yttrium oxide ceramics as potential optical isolator materials
Autorzy:: Kruk, A
Wajler, A
Mrozek, M
Zych, L
Gawlik, W
Brylewski, T
Powiązania:: https://bibliotekanauki.pl/articles/173500.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: transparent ceramics
optical properties
yttrium oxide
Opis:: The objective of the presented study was to investigate the usefulness of transparent, sintered yttrium oxide for application as optical isolators, i.e., materials with high Verdet constant. The study utilizes the magneto-optical Faraday effect. To obtain yttrium oxide sinters, a commercial Y2O3 powder was applied, with LiF added to facilitate sintering. As a result of hot-press sintering and heating, transparent, dense sinters were obtained. The structure and morphology of the powders and bulk samples and the optical properties of the latter were investigated by means of X-ray diffraction, scanning electron microscopy, visible and near-infrared reflectance spectroscopy, and a study of magneto-optical (Faraday) effects. Measurements of the Faraday effect in the wavelength range of 500–1000 nm indicate high Verdet constants for the above-described materials, which means that they can be effectively applied in laser optics.
Źródło:: Optica Applicata; 2015, 45, 4; 585-594
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 55.

Tytuł:: Review on Multi-dimensional Zinc Oxide Nanostructures
Autorzy:: Acharyya, Sarani
Acharyya, Swarnali
Samanta, Pijus Kanti
Powiązania:: https://bibliotekanauki.pl/articles/1031833.pdf
Data publikacji:: 2020
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Band-gap
Morphology
Semiconductor
Zinc Oxide
Opis:: Nanostructured materials are being widely investigated due to their versatile properties leading to promising applications in various areas starting from electronics to environment and medical science. Amongst the various investigated nanostructures, Zinc Oxide (ZnO) is very important because of its versatile properties like high and direct band gap, optical transparency, room temperature ferromagnetism, piezoelectric property and gas sensing property. This mini review article is focused on the morphological study of various ZnO nanostructures starting from hierarchical nanostructures to quantum dots.
Źródło:: World Scientific News; 2020, 147; 140-165
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 56.

Tytuł:: Adhesion of SiO2 layers deposited by means of sol-gel and ALD methods on 316LVM steel
Autorzy:: Basiaga, M.
Walke, W.
Kajzer, A.
Kajzer, W.
Staszuk, M.
Kurtyka, P.
Powiązania:: https://bibliotekanauki.pl/articles/284698.pdf
Data publikacji:: 2016
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: ALD method
thin oxide films
biomaterials
Źródło:: Engineering of Biomaterials; 2016, 19, 138; 114
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 57.

Tytuł:: Synthesis and Curing of Allyl Urethane NIMMO-THF Copolyether with Three Functional Groups as a Potential Energetic Binder
Autorzy:: Wang, Xiaochuan
Li, Ping
Lu, Xianming
Mo, Hongchang
Xu, Minghui
Liu, Ning
Shu, Yuanjie
Powiązania:: https://bibliotekanauki.pl/articles/358158.pdf
Data publikacji:: 2020
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: energetic binder
copolyether
nitrile oxide
elastomer
Opis:: A tri-functional NIMMO-THF copolyether (T-NT) was synthesized by polymerization of 3-nitratomethyl-3-methyloxetane (NIMMO) and tetrahydrofuran (THF) in the presence of trimethylolpropane and catalyzed by BF3·OEt2. The allyl urethane NIMMO-THF copolyether with three functional groups (AUT-NT) was synthesized from tri-functional NIMMO-THF copolyether and allyl isocyanate. The polymer was characterized by FT-IR, 1H NMR, and 13C NMR. Furthermore, an elastomer that was prepared from allyl urethane NIMMO-THF copolyether with three functional groups and trimethylisophthalodinitrile oxide (TINO) had satisfactory mechanical properties and good thermal stability. The elastomer is expected to be used in composite solid propellants and polymer-bonded explosives (PBX).
Źródło:: Central European Journal of Energetic Materials; 2020, 17, 1; 141-163
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 58.

Tytuł:: Solution growth of ZnO sub-micro rods enhanced by electric field
Autorzy:: Pisarkiewicz, T.
Kenig, T.
Rydosz, A.
Maziarz, W.
Powiązania:: https://bibliotekanauki.pl/articles/200101.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nanowires
electrodeposition
dielectrophoretic effect
zinc oxide
Opis:: Recently the one-dimensional ZnO nanostructures have attracted much attention in gas sensor applications owing to their increased role of the surface. The authors have obtained ZnO rods of sub-micron size using the solution growth method with the growth temperature below 100.C. Investigations indicate that the rods have a well-defined hexagonal morphology and a wurtzite structure. The best uniformity and alignment of the sub-micron crystals was however obtained when electrodeposition from aqueous solution was developed. Sizes of these rods depend on the growth parameters. Moreover electrodeposition leads to a faster growth rate of ZnO sub-micron rods (2 hrs) as compared to the growth from solution (8 hrs). After electrodeposition the rods can be easily reoriented in external electric fields by using substrates with electrodes of appropriate geometry and configuration (dielectrophoretic effect). This enables the preparation of samples which can be used in gas sensor technology.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 425-428
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 59.

Tytuł:: Applications of chitosan–graphene oxide nanocomposites in medical science: a review
Autorzy:: Pieklarz, Katarzyna
Tylman, Michał
Modrzejewska, Zofia
Powiązania:: https://bibliotekanauki.pl/articles/1034405.pdf
Data publikacji:: 2018
Wydawca:: Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:: biopolymers
chitosan
graphene
graphene oxide
nanomedicine
Opis:: Combinations of biopolymers with nanostructured carbon materials have been the subject of interest of many scientists in recent years. Particularly significant are nanocomposites made of chitosan, which is a linear aminopolysaccharide obtained in the process of deacetylation of chitin, and graphene oxide (GO). These systems, due to the atypical properties of both components such as non-toxicity, biocompatibility with human tissues and organs as well as bacteriostaticity, are characterised by a wide range of biomedical applications. They may be used in emergency medicine as dressing materials which accelerate wound healing, as well as carriers of drugs/genes and biological macromolecules, for example proteins, peptides and nucleic acids. In addition, CS-GO systems can potentially be used in regenerative medicine as scaffolds for cell culture. For this reason, the current publication presents the possibilities of the application of chitosan–graphene oxide nanocomposites in medicine considering the characteristics of the system components.
Źródło:: Progress on Chemistry and Application of Chitin and its Derivatives; 2018, 23; 5-24
1896-5644
Pojawia się w:: Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 60.

Tytuł:: Manufacturing and characterization of gellan gum – zinc oxide composites as potential biomaterials for wound treatment
Autorzy:: Macyk, Alicja
Kusibab, Anna
Pamuła, Elżbieta
Powiązania:: https://bibliotekanauki.pl/articles/27324040.pdf
Data publikacji:: 2023
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: gellan gum
zinc oxide nanoparticles
zinc oxide
microparticles
wound healing
L929 fibroblasts
cynk
fibroblasty
biomateriały
Opis:: This study aimed to produce gellan gum-based hydrogels with the addition of zinc oxide as a potential dressing material. Hydrogels with ZnO concentrations of 0.01%, 0.02% and 0.04% were prepared, micrometric and nanometric ZnO particles were used, and a CaCl2 crosslinker was added to one part of the samples. All samples (14 types) produced by the freeze drying method were characterized with high swelling properties (>2000%), what is important to ensure the absorption of exudates from wounds. Samples with ZnO particles cross-linked with CaCl2 lost less mass after incubation in aqueous media and were characterized by better dimensional stability than those without crosslinking. The pH of the extracts of the samples containing ZnO particles was more neutral (pH 7.0-7.6) than that of the control gellan gum samples (pH of 5.5-6.1). The zinc release from cross-linked samples was twice as high for those containing nanometric particles than for micrometric particles (1.94 ± 0.04 mg/l and 0.93 ± 0.02, respectively). Relatively large amounts of released zinc species in the case of samples containing ZnO nanoparticles are promising in the context of the antibacterial properties and treatment of infected wounds. A lower amount of zinc released from samples with ZnO microparticles could be sufficient to prevent the development of the infection. Furthermore, both materials show satisfactory cytocompatibility with L929 fibroblasts, as shown by Alamar blue and live/dead viability tests, making them prospective candidates for wound healing
Źródło:: Engineering of Biomaterials; 2023, 26, 168; 2--8
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 61.

Tytuł:: Difference of Microstructures and Mechanical Properties between 9Cr-1W Ferritic/martensitic Steel and ODS Steel
Autorzy:: Kim, Ga Eon
Kim, Tae Kyu
Noh, Sanghoon
Powiązania:: https://bibliotekanauki.pl/articles/355149.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: 9Cr-1W steel
oxide dispersion strengthening
ODS
grain refinement
nano-oxide particle
creep resistance
Opis:: Ferrtic/martensitic and ODS steels were fabricated by the mechanical alloying process, and their microstructures and mechanical properties were investigated. The 9Cr-1W and 9Cr-1W-0.3Ti-0.35Y₂ O₃ (in wt.%) steels were prepared by the same fabrication process such as mechanical alloying, hot isostatic pressing, and hot rolling processes. A microstructural observation of these steels indicated that the Ti and Y₂ O₃ additions to 9Cr-1W steel were significantly effective to refine the grain size and form nano-sized Y-Ti-O oxide particles. As a result, the tensile strengths at room and elevated temperatures were considerably enhanced. Considerable improvement of the creep resistances at 700°C was also evaluated. It is thus concluded that 9Cr-1W ODS steel with Ti and Y₂ O₃ additions would be very effective in improving the mechanical properties especially at elevated temperatures.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 1; 337-341
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 62.

Tytuł:: Crystal Lattice Damage and Recovery of Rare-Earth implanted Wide Bandgap Oxides
Autorzy:: Sarwar, Mahwish
Ratajczak, Renata
Ivanov, Vitalii
Mishra, Sushma
Turek, Marcin
Wierzbicka, Aleksandra
Woźniak, Wojciech
Guziewicz, Elżbieta
Powiązania:: https://bibliotekanauki.pl/articles/2204945.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: wide bandgap oxides
zinc oxide
gallium oxide
rare earth
ion implantation
Rutherford backscattering spectrometry
low temperature photoluminescence
Opis:: Rare earth (RE) elements are important for the optical tuning of wide bandgap oxides (WBO) such as β-Ga2O3 or ZnO, because β-Ga2O3:RE or ZnO:RE show narrow emission lines in the visible, ultra-violet and infra-red region. Ion implantation is an attractive method to introduce dopant into the crystal lattice with an extraordinary control of the dopant ion composition and location, but it creates the lattice damage, which may render the dopant optically inactive. In this research work, we investigate the post-implantation crystal lattice damage of two matrices of wide-bandgap oxides, β-Ga2O3 and ZnO, implanted with rare-earth (RE) to a fluence of 5 x 10^14, 1 x 10^15 and 3 x 10^15 atoms/cm^2, and post-growth annealed in Ar and O2 atmosphere, respectively. The effect of implantation and annealing on both crystal lattices was investigated by channeling Rutherford backscattering spectrometry (RBS/C) technique. The level of crystal lattice damage caused by implantation with the same RE fluences in the case of β-Ga2O3 seems to be higher than in the case of ZnO. Low temperature photoluminescence was used to investigate the optical activation of RE in both matrices after performed annealing.
Źródło:: Advances in Science and Technology. Research Journal; 2022, 16, 5; 147--154
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 63.

Tytuł:: Sorption properties of stainless steel membranes impregnated with titanium dioxide sorbent
Autorzy:: Bilewicz, A.
Powiązania:: https://bibliotekanauki.pl/articles/147324.pdf
Data publikacji:: 2004
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: high temperature adsorption
titanium oxide
impregnated membrane
Opis:: High-temperature sorption of corrosion products from primary cooling circuit is an effective method for radiation reduction in pressurize and boiling reactor plants. We have developed a suitable high temperature resistant adsorbent by impregnating a porous stainless steel membrane with titanium oxide. The adsorption studies of corrosion products in soluble and insoluble forms indicate that the stainless steel membrane impregnated with TiO2 combines high affinity of TiO2 for transition metal cations with a high mechanical stability of the porous steel membrane under high-temperature and highpressure conditions.
Źródło:: Nukleonika; 2004, 49, 4; 163-165
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 64.

Tytuł:: Dependence of Reoxidation Effect on a Type of Gating System in Investment Casting Technology
Autorzy:: Herman, A.
Vratny, O.
Powiązania:: https://bibliotekanauki.pl/articles/379520.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: investment casting
gating system
oxide film
metallography
Opis:: Nowadays, there are growing demands on the accuracy of production. Most of this is reflected in precise manufacturing, such as the investment casting process. Foundries are looking for causes of defects in some cases for a very long time, and it may happen that the source of defects is completely different from what was originally assumed. During the casting process there exist potential causes of defects as oxygen inclusions. This paper represents a summary of the beginnings of a wider research that will address the problems of gating systems in investment casting technology. In general, the influence of the melt flow is underestimated and the aim of the whole scientific research is to demonstrate the significant influence of laminar or turbulent flow on the resulting casting quality. Specifically, the paper deals with the analysis of the most frequent types of defects found in castings made of expensive types of materials casted in an open atmosphere and demonstration of connection with the design of gating systems in the future.
Źródło:: Archives of Foundry Engineering; 2018, 18, 3; 107-112
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 65.

Tytuł:: Immunohistochemical evaluation of the influence of L-arginine on biomarkers of environmental (cellular) stress in the kidneys of pregnant female rats
Autorzy:: Pedrycz, Agnieszka
Siermontowski, Piotr
Powiązania:: https://bibliotekanauki.pl/articles/989964.pdf
Data publikacji:: 2017
Wydawca:: Instytut Medycyny Wsi
Tematy:: nitric oxide
cellular stress
kidneys
pregnancy
immunohistochemistry
Opis:: Introduction. Kidney damage during pregnancy constitutes a diagnostic and therapeutic challenge. However, it is not entirely known whether a kidney condition recognised before the pregnancy releases an organism’s response to pregnancy, or whether pregnancy itself worsens kidney function. Objective. The aim of the study was immunohistochemical evaluation of cells of kidneys of pregnant rats under the influence of nitric oxide (NO), with measurement of the immunoexpression of cellular stress markers (p-53, HSP 70). The dose of administered L-arginine (NO substrate) was approximated to that applied in obstetrics in gestosis prevention and treatment in pregnant women. Materials and method. 60 female rats used in experiment were divided into 6 groups: 3 experimental and 3 control. The females from experimental groups were administered L-arginine (40g/kg, per os) every other day starting from the seventh day or pregnancy. The animals were decapitated on the 10th, 20th day of pregnancy, and 10 days after the delivery. Kidneys taken from decapitated rats were evaluated using the immunohistochemical three step method. HSP 70 and p-53 proteins were detected. Conclusions. L-arginine increased the expression of p-53 protein – on the 10th day of pregnancy, which increased at the end of pregnancy; however, 10 days after delivery the level dropped below that observable during physiological pregnancy. Hormonal changes in physiological pregnancy cause an increase in expression of the p-53 (cell stress marker) in the epithelial cells of renal tubules, mainly at the end of pregnancy (20th day). 10 days after the delivery, this expression decreases. The expression of HSP-70 protein increases already on the 10th day of pregnancy and maintains a similar level throughout the pregnancy, but is reduced after the puerperium.
Źródło:: Annals of Agricultural and Environmental Medicine; 2017, 24, 1
1232-1966
Pojawia się w:: Annals of Agricultural and Environmental Medicine
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 66.

Tytuł:: Microstructure Characterization of Composite from ZrO2 – Ti System
Autorzy:: Łada, P.
Miazga, A.
Bazarnik, P.
Konopka, K.
Powiązania:: https://bibliotekanauki.pl/articles/354416.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: titanium
zirconium oxide (ZrO2)
composite
stereology
Opis:: In this work the microstructure analysis of composite from ZrO₂ – Ti system were presented. For the preparation of the composite samples nanometric ZrO₂ powder stabilized by 3 mol% of Y₂O₃ and micrometric titanium powder were used. The composites with 10 vol.% addition of titanium particles were prepared by slip casting method. The sintering process was conducted at 1450°C with 2 hours’ dwell time, in the inert atmosphere of argon. The microstructure observations were carried out with the use of SEM and STEM microscopes. The quantitative analysis and stereological characterization were performed. The SEM and STEM observations allowed characterizing the microstructure of composite samples. Especially, the interface between titanium particles and zirconia matrix was described. The growth of the zirconia grains around the Ti rich areas was observed. The increase of the zirconia grains size results from the reaction on the interface between titanium particle and zirconia matrix during the sintering process.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 4; 2045-2049
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 67.

Tytuł:: A Study on the Electrical Characteristics and Oxidation Resistance of the STS434L-High Chrome Powder Green Compact at the High-Temperature
Autorzy:: Park, J. W.
Jung, W. Y.
Park, D. K.
Ahn, I. S.
Powiązania:: https://bibliotekanauki.pl/articles/354543.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: stainless steel
fecraloy
oxidation resistance
metallic oxide
Opis:: Metallic oxide layer of heat resistant element contributes to the high-temperature oxidation resistance by delaying the oxidation, and also has positive effect on the electrical resistivity increase. In this study, the green compacts of Fe-Cr-Al powder mixed with STS434L were oxidized at 950°C up to 210 hrs in order to consider the effect of metal oxide on the oxidation and electrical resistance. It exhibited the low oxidation resistance in case of 434L only, however it increased as the amount of Fe-Cr-Al powder in the 434L compact. The higher electrical resistivity was observed at the Fe-Cr-Al compact with and 434L powder. The metal oxides of (Fe_0.6C_0.4)₂O₃, Cr₂O₃, and Fe₂O₃ contributed to the electrical resistivity, whereas Al₂O₂ took a role of oxidation resistance.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 1; 431-435
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 68.

Tytuł:: Parameter Characterization in Processing of Silver - Aluminum Based Electrical Contact Materials
Autorzy:: Praveen Kumar, S.
Parameshwaran, R.
Ananthi, A.
Jenil Jaba Sam, J.
Powiązania:: https://bibliotekanauki.pl/articles/352711.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electrical contactor
silver
aluminum
tin oxide
conduction
Opis:: An electrical contractor is one which plays significant role in day todays life in industries as well as in home appliances. In current scenario the materials for conducting purpose has an overwhelming research capability. Now a day the silver based electrical contact composite material have provided the potential applications in aerospace and automobile industries. Among silver based contact material the silver cadmium oxide and silver tin oxide plays a vital role in fabrication of electrical contactors. In this research an attempt has been made to study the influence of adding Aluminum with silver based electrical contact composite materials by two different processing routes namely stir-casting and powder metallurgy. Silver and aluminum matrix plays a virtual role in composite world owing to their highest conductivity. Optimum parameters were identified for attaining the maximum properties such as conductivity, hardness, density, and porosity of composition. By this better conducting property and mechanical property of the electrical contact can be improved by this system. Thus a screening test has be conducted with addition of Al with silver tin oxide compositions hence this paper aims to process the aluminum – silver based electrical contact materials by stir casting processing and powder metallurgy route and compare the results obtained.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 3; 1895-1901
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 69.

Tytuł:: Assessment of nitrous oxide emissions from agricultural soils at a local level in Poland
Autorzy:: Wiśniewski, P.
Powiązania:: https://bibliotekanauki.pl/articles/2082567.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: nitrous oxide
emission
agricultural soils
communes
Polska
Opis:: Nitrous oxide (N2O) is a very potent greenhouse gas whose concentration in the atmosphere is steadily increasing. Almost 80% of the annual N2O emissions in Poland originate from agriculture, and its main source is the use of agricultural soils. This study attempts to estimate the N2O emissions from agricultural soils and presents statistical analyses and spatial distributions for all Polish communes. For this purpose, a solution has been proposed which could be successfully applied by local government in order to assess N2O emissions, as well as to monitor the impact of actions undertaken to limit them. The annual N2O emissions from agricultural soils in Polish communes varies from 0.002 Mg N2O-N to 437.77 Mg N2O-N (with an average value of 21.13 Mg N2O-N and a standard deviation of 23.86 Mg N2O-N), and the cultivation of organic soils is its main source. The use of fertilizers and nitrogen fertilization with plant residues, as well as indirect emissions from nitrogen leaching, are also significant. The results may be used to provide a database for local governments, which will serve, not only to identify local emission sources related to agricultural soils, but also to properly plan and prioritize measures for its reduction.
Źródło:: International Agrophysics; 2019, 33, 3; 303-311
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 70.

Tytuł:: The impact of atomic layer deposition technological parameters on optical properties and morphology of Al2O3 thin films
Autorzy:: Dobrzanski, L. A.
Szindler, M.
Hajduk, B.
Kotowicz, S.
Powiązania:: https://bibliotekanauki.pl/articles/173801.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: thin film
aluminum oxide
atomic layer deposition
Opis:: This paper presents some results of investigations on aluminum oxide Al2O3 thin films prepared by the atomic layer deposition method on polished monocrystalline silicon. It has been described how the technological parameters of the deposition process, like the number of cycles and substrate temperature, influenced the optical properties and morphology of prepared thin films. Their physical and optical properties like thickness, uniformity and refractive index have been investigated with spectroscopic ellipsometry, atomic force microscopy and UV/vis optical spectroscopy.
Źródło:: Optica Applicata; 2015, 45, 4; 573-583
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 71.

Tytuł:: The sensitivity of sensor structures with oxide graphene exposed to selected gaseous atmospheres
Autorzy:: Pustelny, T.
Drewniak, S.
Setkiewicz, M.
Maciak, E.
Urbańczyk, M.
Procek, M.
Gut, K.
Opilski, Z.
Jagiello, J.
Lipinska, L.
Powiązania:: https://bibliotekanauki.pl/articles/200229.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: graphene
graphene oxide
gas sensors
resistive sensors
Opis:: The paper presents the results of investigations on the resistive structure with a graphene oxide (GO) sensing layer. The effects of dangerous gases (hydrogen and nitrogen dioxide) on the structure were studied; the resistance changes were examined during the flow of the selected gas in the atmosphere of synthetic air. Measurements were performed with a special emphasis on the detection of low concentrations of the analyzed gases. The reactions of the sensing structure to the effect of nitrogen and synthetic air at different humidity were also tested. Much attention was also paid to the fast response of the sensor to the changes in the gas atmosphere. The thin palladium layer (~2 nm) has been applied in order to improve the sensing properties of the structure. The investigations were performed in the temperature range from RT to 120°C and the analyzed gases in synthetic air were batched alternately with pure synthetic air.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 705-710
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 72.

Tytuł:: Immunohistochemical study on the development of cholinergic and nitrergic nerve structures in the bovine esophageal groove
Autorzy:: Marszałek, M.
Serzysko, T.
Sienkiewicz, W.
Powiązania:: https://bibliotekanauki.pl/articles/16539106.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: esophageal groove
acetylcholine
nitric oxide
immunohistochemistry
development
Opis:: The proper functioning of the perinatal sucking reflex in calves is essential for the prevention of milk leakage into the rumen. The complex process behind its regulation is mediated at the gut level via multiple excitatory and inhibitory neurotransmitters, of which acetylcholine and nitric oxide are of fundamental importance. The aim of our study was to depict age-related alterations in the cholinergic and nitrergic innervation of the esophageal groove (EG) using immunohistochemistry and Real-Time PCR methods. We found out that the highest number of cholinergic nerve cells was present in the second trimester fetuses. From this developmental stage onward, their amount was gradually decreasing and reached the lowest value in 4-year-old cows. The same developmental pattern was observed for nitrergic nerve structures with the highest percentage of nitrergic neurons in the third trimester fetuses. Our observations prove that both neuronal populations are crucial for a proper closure of EG in calves. Therefore, their contribution to a general neuronal activity in the ENS diminishes with age as the high motility of a gastric groove is not necessarily required in older cattle.
Źródło:: Polish Journal of Veterinary Sciences; 2022, 25, 1; 165-174
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 73.

Tytuł:: Electric strength of air and sulphur hexafluoride in the system with electrodes covered with dielectric double layer
Autorzy:: Zakrzewski, S.
Opydo, W.
Powiązania:: https://bibliotekanauki.pl/articles/97710.pdf
Data publikacji:: 2012
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:: electric strength air
sulphur hexafluoride
aluminum oxide
Opis:: The paper presents the results of the study on the effect of dielectric double layer at electrode surface on electric strength of compressed air and compressed sulphur hexafluoride. The research has been carried out at alternate voltage of 50 Hz frequency. It was found that thin insulation coating laid on electrode surface, composed of aluminum oxide layer with a layer of electro-insulation polyester lacquer significantly improves electric strength of air and sulphur hexafluoride. It was found that maximum growth of electric strength of these gases was caused by the coating under their pressures exceeding the atmospheric one (3·10⁵ and 5·10⁵ Pa). The changes in configuration of electrode surface of the insulation systems caused by sparking over have been examined with scanning laser confocal microscope.
Źródło:: Computer Applications in Electrical Engineering; 2012, 10; 394-401
1508-4248
Pojawia się w:: Computer Applications in Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 74.

Tytuł:: Temperature-dependence of cathodoluminescence of zinc oxide monolayers obtained by atomic layer deposition
Autorzy:: Witkowski, B S
Wachnicki, L
Nowakowski, P
Suchocki, A
Godlewski, M
Powiązania:: https://bibliotekanauki.pl/articles/173941.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: zinc oxide
cathodoluminescence
profiling
temperature-dependence
localization
Opis:: We performed cathodoluminescence (CL) investigations of zinc oxide monolayers obtained by atomic layer deposition. Layers of different thickness were deposited on commercial GaN/sapphire templates. Scanning electron microscopy (SEM) system equipped with CL allows direct comparison of SEM images and CL maps, taken from exactly the same areas of samples. In addition to SEM and CL images, CL profiling was performed by collecting the CL spectra at different accelerating voltages. The CL profiling allows to distinguish the emissions from a surface and volume of samples. An inter-link between samples microstructure and emission properties is investigated. Shifts of emission bands, associated by us with the localization effects, are observed. CL investigations are supported by photoluminescence (PL) measurements, which are characterized by a higher spectral resolution. PL investigations allow determination of the origin of emission bands.
Źródło:: Optica Applicata; 2013, 43, 1; 187-194
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 75.

Tytuł:: Relation between nitric oxide (NO) level in semen and certain properties of boar spermatozoa stored at 17°C
Autorzy:: Orzołek, A.
Zasiadczyk, Ł.
Wysocki, P.
Kordan, W.
Krysztofiak, P.
Powiązania:: https://bibliotekanauki.pl/articles/2087744.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nitric oxide
liquid storage
boar spermatozoa quality
Źródło:: Polish Journal of Veterinary Sciences; 2018, 21, 2; 423-426
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 76.

Tytuł:: Short- and medium-range order in bismuth-silicate glasses: a solecular dynamics study
Autorzy:: Witkowska, A.
Rybicki, J.
Laskowski, R.
Mancini, G.
Feliziani, S.
Alda, W.
Powiązania:: https://bibliotekanauki.pl/articles/1954531.pdf
Data publikacji:: 1999
Wydawca:: Politechnika Gdańska
Tematy:: structure of matter
oxide glasses
MD simulations
Opis:: We report on the results of classical molecular dynamics (MD) simulations of str ucture of amorphous 15 Bi2O3 85 SiO2 [% mol] and 40 Bi2O3 60 SiO2 [% mol], and their totally reduced forms, 15 Bi2 85 SiO2 [% mol], and 40 Bi2 60 SiO2 [% mol], respectively. The simulations have been perfo rmed in the isobaric-isoenthalpic ensemble, using a two-body interaction potential. The set of the potential parameters was constructed as a suitable com bination of the parameters which were previously proposed for pure Bi2O3, and SiO2. Both unreduced, and reduced sy stems were initially prepared as well equilibrated hot melts, and then slowly co oled down to 300K. The structural information from the MD simulations was obtained from radial and angular distribution functions, static structural factors, Voronoi polyhedra sta tistics, and ring analysis. The simulation results can be summarised as follows. In unreduced glass with 15% [mol] Bi2O3 contents, the silicon structural units (mainly regular tetrahedra) form continuous network, whereas in 40% [mol] Bi2O3 glass these units are disconnected. In both unreduced systems Bi ions have mainly six-fold oxygen co-ordination, and no dominating structural unit can be individuated. However, the distorted bismu th units form a continuous network. In both totally reduced glasses (15% Bi2 85% SiO2, and 40% Bi2 60% SiO2 [% mol]), the silica network is built entirely from corner shari ng SiO4 tetrahedra. The structure of the silica subsystem is similar to that of pure *-SiO2. After the reduction, the Bi-Bi co-ordination significantly increases, whereas the first neighbour distance decreases. Moreover, partial static structural fact ors for Bi-Bi pairs indicate that the medium-range order in reduced glasses exhi bits greater periodicity than in unreduced glasses. Neutral Bi atoms form small clusters within the silica matrix.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 2; 239-254
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 77.

Tytuł:: Annealing effect on nickel oxide nanoparticles synthesized by sol-gel method
Autorzy:: Kavitha, B.
Nirmala, M.
Pavithra, A.
Powiązania:: https://bibliotekanauki.pl/articles/1189956.pdf
Data publikacji:: 2016
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Nickel Oxide nanoparticles
XRD
SEM
TGA-DTA
Opis:: NiO nanoparticles were synthesized by Sol-Gel method and the synthesized nanoparticles were annealed at different temperatures. The powders were investigated with x-ray diffraction, scanning electron microscopy and TGA. The structural characterization was carried out by x-ray diffraction which confirms the polycrystalline nature of the films with a cubic structure. SEM analysis of the films enabled the conclusion that the prepared films are uniform, rough, large crystals and agglomeration of particles were observed. The thermal stability of the sample was examined by TGA analysis which showed NiO nanoparticles formed between 130-720 C.
Źródło:: World Scientific News; 2016, 52; 118-129
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 78.

Tytuł:: Biogenic production of zinc oxide nanoparticles from aqueous extracts of Duranta erecta L.
Autorzy:: Ravindran, C. P.
Manokari, M.
Shekhawat, Mahipal S.
Powiązania:: https://bibliotekanauki.pl/articles/1193011.pdf
Data publikacji:: 2016
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Bioreduction
Characterization
Duranta erecta
Zinc oxide nanoparticles
Opis:: The present communication reports the biosynthesis of zinc oxide nanoparticles using aqueous extracts of leaves, stem, root, flowers and fruits of Duranta erecta L. This plant gains horticultural and medicinal importance due to its various biological activities. Zinc Nitrate Hexahydrate [Zn (NO3)2•6H2O] solution was used as a precursor to synthesize Zinc oxide nanoparticles. The various plant (leaves, stem, roots, flowers, fruits) extracts played as reducing agents. The leaf extract showed strong absorbance peak at 302 nm, stem and flower peaks were located at 299 nm, roots at 293 nm and fruit extract solution peak observed at 317 nm.
Źródło:: World Scientific News; 2016, 28; 18-28
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 79.

Tytuł:: Charging Phenomena at the Interface Between High-k Dielectrics and SiOx Interlayers
Autorzy:: Engström, O.
Raeissi, B.
Piscator, J.
Mitrovic, I. Z.
Hall, S.
Gottlob, H. D. B.
Schmidt, M.
Hurley, P. K.
Cherkaoui, K.
Powiązania:: https://bibliotekanauki.pl/articles/308138.pdf
Data publikacji:: 2010
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: defects
dielectrics
high-k
metal oxide semiconductor
Opis:: The transition regions of GdSiO/SiOx and HfO2/ SiOx interfaces have been studied with the high-k layers deposited on silicon substrates. The existence of transition regions was verified by medium energy ion scattering (MEIS) data and transmission electron microscopy (TEM). From measurements of thermally stimulated current (TSC), electron states were found in the transition region of the HfO2/SiOx structures, exhibiting instability attributed to the flexible structural molecular network expected to surround the trap volumes. The investigations were focused especially on whether the trap states belong to an agglomeration consisting of a single charge polarity or of a dipole constellation. We found that flat-band voltage shifts of MOS structures, that reach constant values for increasing oxide thickness, cannot be taken as unique evidence for the existence of dipole layers.
Źródło:: Journal of Telecommunications and Information Technology; 2010, 1; 10-19
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 80.

Tytuł:: Snišenie koncetracii oksidov azota v otrabotavših gazah Dizelej rybolovnogo flota
The reduction of nitrogen oxide in exhaust gases of fishing fleet Diesel engines
Autorzy:: Klyus, O.
Klyus, I.
Powiązania:: https://bibliotekanauki.pl/articles/360499.pdf
Data publikacji:: 2013
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:: diesel engine
nitrogen oxide
preliminary fuel treatment
Opis:: The article presented the results of the reduction of nitrogen oxide in exhaust gases of Diesel engines used in fishing boats and vessels. For this purposes was used preliminary fuel treatment that takes place directly in the fuel injector and mixture of Diesel oil with water.
Źródło:: Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 35 (107); 86-89
1733-8670
2392-0378
Pojawia się w:: Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 81.

Tytuł:: The High Temperature Oxidation Stability of STS434L/Silicon Oxide Compacts
Autorzy:: Park, J. W.
Ko, B. H.
Jung, W. Y.
Park, D. K.
Ahn, I. S.
Powiązania:: https://bibliotekanauki.pl/articles/352481.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: high-temperature oxidation stability
metallic oxide
densification
Opis:: In order to improve the high-temperature oxidation stability, a study of 434L sintered stainless steel was focused on the effect of addition of metallic oxides to form stable oxide film on the inner particle surface. In this paper, oxidation behavior of 434L compacted parts in accordance with the addition of metallic oxides were discussed with high temperature oxidative reaction, and sintering behavior analysis under 950°C. Oxidation weight gains of 434 L have increased as a form of parabolic laws. The hightemperature oxidation resistance was improved by the mixed addition of amorphous SiO₂ and silica up to 2wt.%. The oxidation rate was decreased and kept constant after 60 hours. It was caused by the restraint succeeding oxidation due to the stable oxide formation of Cr₂SiO₄ phases on the particle surface to prevent densification and inhibition the external diffusion of Cr. High-temperature stability was confirmed by the electrical resistivity maintains the constant value of 1.3×10^-2 Ω ·cm when the silica added less than 2w/o to 1w/o A-SiO₂ added 434L.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 1; 307-313
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 82.

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: 83.

Tytuł:: UO2 nanoparticles synthesis from leaching solutions on the hematite support
Autorzy:: Sadowski, Zygmunt
Sklodowska, Aleksandra
Powiązania:: https://bibliotekanauki.pl/articles/763988.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:: bioleaching, nanoparticles, hematite, zeta potential, uranium oxide
Opis:: In the present studies the bacterial leaching process is used to extract uranium from the uranium mining wastes. The bioleaching process is environment friendly and gives the extraction yield of over 90%. The bioleaching solutions were obtained from the waste materials located at different places at Lover Silesia (Kowary, Grzmiąca, Kopaniec). Among various templates the hematite Fe2O3 nanoparticles are most useful. Interactions uranium ions with synthesized nanoparticles of hematite, magnesite, and iron were examined.
Źródło:: Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2016, 71, 1
2083-358X
Pojawia się w:: Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 84.

Tytuł:: Leaching of zinc from low grade oxide ore using organic acid
Autorzy:: Irannajad, M.
Meshkini, M.
Azadmehr, A. R.
Powiązania:: https://bibliotekanauki.pl/articles/110892.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: leaching
zinc oxide ore
citric acid
smithsonite
Opis:: The leaching of low grade zinc oxide mining tailings by organic acid as a leaching agent was investigated. Zinc was extracted successfully from sample by citric acid leaching. The effects of solid-to- liquid ratio, acid concentration, reaction time, temperature and ore particle size on the leaching efficiency were studied. The results obtained showed that particle sizes and reaction time had not any significant effect on the leaching recovery of zinc from smithsonite in the sizes range of 40-350 μm. Under conditions: temperature of 80ºC, reaction time of 60 min, citric acid concentration of 0.5 mol/L, and solid to liquid ratio of 1:10, 82% of zinc could be recovered.
Źródło:: Physicochemical Problems of Mineral Processing; 2013, 49, 2; 547-555
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 85.

Tytuł:: Influence of polysorbate 80 on the flotation of zinc oxide ores with amines
Autorzy:: Xie, Qiaoling
Wang, Dandan
Han, Zhichao
Tao, Huchun
Liu, Sitong
Powiązania:: https://bibliotekanauki.pl/articles/2146852.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: polysorbate 80
pretreated amines
zinc oxide
flotation
Opis:: In this study, the influence of polysorbate 80 on zinc oxide flotation was investigated with an amine collector. The results indicated that the pretreatment of amines with polysorbate 80 enhanced the Zn grade and recovery obtained using zinc oxide flotation. Desliming prior to flotation is not suggested based on the results of this study. The appropriate temperature for flotation was as low as 8 °C, and this flotation method also could be applied to different types of zinc oxide ores. Under optimum flotation conditions, a concentrate with a Zn grade of 48.34% and a Zn recovery of 95.97% was obtained.
Źródło:: Physicochemical Problems of Mineral Processing; 2022, 58, 1; 149--158
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 86.

Tytuł:: Zinc oxide as a functional admixture to cement composites
Autorzy:: Klapiszewska, Izabela
Ławniczak, Łukasz
Parus, Anna
Jesionowski, Teofil
Klapiszewski, Łukasz
Ślosarczyk, Agnieszka
Powiązania:: https://bibliotekanauki.pl/articles/2146946.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: zinc oxide
admixtures
cement composites
antimicrobial tests
Opis:: There is an increasing trend in the modern construction industry to use nanomaterials, which allow to improve the performance of construction materials on the one hand, and to shape new properties on the other. This study presents the results of physicomechanical and antibacterial tests for cement composites modified with zinc nanooxide. The main aim of this study was to compare the structural and morphological properties of three selected commercial zinc nanooxides and to determine the influence of the above mentioned nanooxides on the physicomechanical properties of cement composites and the ability to inhibit the activity of gram-positive and gram-negative bacteria as well as fungi. It was shown that commercial nanooxides can significantly differ in terms of physicochemical properties, which depend on their production method. Two of them were characterized by high specific surface areas, which in turn translated into rheological properties of cement mortars. Nanooxides with higher specific surface areas tend to reduce the plasticity of the mortars. According to the literature data, all nanooxides caused a delay in cement binder setting by more than 100%. This resulted in a reduction of the early one-day flexural and compressive strength of the composite. In the later curing period, especially after 7 days of hardening, a significant acceleration of the hydration process was observed in composites with the addition of all nanooxides, which was confirmed by significant increases in mechanical parameters. Nevertheless, the tested nanooxides showed different sensitivity towards microorganisms, which was influenced by both the type of nanooxide and bacteria.
Źródło:: Physicochemical Problems of Mineral Processing; 2022, 58, 2; art. no. 145565
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 87.

Tytuł:: Concentration of Nitrogen Oxides When Burning Wood Pellets of Various Origins
Autorzy:: Ciupek, Bartosz
Gołoś, Karol
Powiązania:: https://bibliotekanauki.pl/articles/123284.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: nitrogen oxide
heating boiler
emission
wood pellet
Opis:: The paper examined the impact of wood pellets of different type on the emission of nitrogen oxides (NO_x) formed during the combustion process in a low-power heating boiler. The study aim was to determine the dependencies of the NO_x emission levels on the chemical composition of fuel. The test was carried out using a model of a combustion chamber equipped with a dedicated burner. The analysis of the results confirmed the relationship between flue gas and the formation of NO_x. The obtained results prove the possibility of reorganizing the combustion process in order to reduce the NO_x emission by selecting a proper composition of raw materials when producing wood pellets.
Źródło:: Journal of Ecological Engineering; 2020, 21, 5; 229-233
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 88.

Tytuł:: Reduction of Copper, Iron, and Lead Content in Laboratory Wastewater Using Zinc Oxide Photocatalyst under Solar Irradiation
Autorzy:: Agustina, Tuty Emilia
Habiburrahman, Muhammad
Amalia, Farah
Arita, Susila
Faizal, Muhammad
Novia
Gayatri, Rianyza
Powiązania:: https://bibliotekanauki.pl/articles/2202163.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: AOPs
photocatalysis
heavy metals
sunlight
zinc oxide
Opis:: Heavy metal is a type of metal that has a high density and high toxicity when consumed by living things, especially humans. To prevent the impact of environmental pollution, optimal handling of wastewater containing heavy metals is required, including the wastewater from laboratories. This research aimed to study the effect of pH, catalyst dose, and irradiation time on the reduction of Copper (Cu), Iron (Fe), and Lead (Pb) heavy metals and their application to laboratory wastewater treatment. Among the Advanced Oxidation Processes (AOPs) methods, photocatalysis was chosen to reduce the level of Cu, Fe, and Pb heavy metals where zinc oxide (ZnO) is used as a photocatalyst and the sunlight as a light source. To determine the effect of pH, catalyst dose, and time on the reduction of heavy metal levels, firstly, this research used the synthetic wastewater containing Cu, Fe, or Pb heavy metals. On the basis of the experimental results, it is concluded that the pH value, catalyst dose, and time affect the photocatalytic process, decreasing the levels of Cu, Fe, and Pb metals. The optimum pH value obtained for Cu was at pH 7–8, for Fe it was at pH 6, and for Pb it was at pH 8; in turn, the metal removal percentages were 99.46, 99.91, and 99.70%, respectively. In the photocatalysis of synthetic wastewater, high removal percentage of more than 99% was achieved by using 0.1 g/L catalyst. The optimum decrease of metals occurred in the first 15 minutes of solar irradiation where the removal percentage was close to 100%. In this study, the application of ZnO photocatalyst under solar irradiation can reduce the heavy metals content in the laboratory wastewater by almost 100%, which meets the environmental quality standard for Cu, Fe, and Pb.
Źródło:: Journal of Ecological Engineering; 2022, 23, 10; 107--115
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 89.

Tytuł:: The effect of thiocetam on the parameters of the nitric oxide system under the conditions of the experimental periodontitis and immobilization stress formation
Autorzy:: Regeda, Mykhailo
Olekshij, Petro
Regeda-Furdychko, Maaryana
Furdychko, Lubomur
Kolishetska, Marta
Regeda, Stepan
Fil, Vitalii
Powiązania:: https://bibliotekanauki.pl/articles/40570860.pdf
Data publikacji:: 2024-06-30
Wydawca:: Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:: L-arginine
nitric oxide
periodontitis
stress
thiocetam
Opis:: Introduction and aim. The aim of this work is to study the parameters of the nitric oxide (NO) system in the blood of guinea pigs under the conditions of the experimental periodontitis (EP) and immobilization stress (IS) formation and to evaluate the effectiveness of thiocetam use. Material and methods. Experimental studies were performed on 50 guinea pigs (males, body weight 0.18–0.21 kg) which were divided into five groups (10 in each): the first group were intact animals as control; the second experimental group were animals with experimental periodontitis under conditions of immobilization stress (3rd day), the third group included guinea pigs with EP and IS on the 5th day of the combined model process, group IV – animals with EP and IS 15th day (without administration of thiocetam) and group V – animals on the 15th day of experiment with EP and IS after use of thiocetam. Results. As a result of this research, changes in the activity of the NO system in the blood were observed, namely an increase in the level of stable metabolites and an increase in the activity of total NO-synthase, which is accompanied by a compensatory inhibition of the L-arginine activity, and these indicators were most pronounced in the late stages of EP and IS formation. Conclusion. The use of thiocetam showed a corrective effect on the changed variables of NO metabolism in the peripheral blood of guinea pigs under the conditions of the EP and IS development.
Źródło:: European Journal of Clinical and Experimental Medicine; 2024, 22, 2; 340-346
2544-2406
2544-1361
Pojawia się w:: European Journal of Clinical and Experimental Medicine
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 90.

Tytuł:: Evaluation of MOSFETs with crystalline high-k gate-dielectrics: device simulation and experimental data
Autorzy:: Zaunert, F.
Endres, R.
Stefanov, Y.
Schwalke, U.
Powiązania:: https://bibliotekanauki.pl/articles/308785.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: crystalline high-k gate dielectric
rare-earth oxide
praseodymium oxide
gadolinium oxide
damascene metal gate
CMP
CMOS process
TSUPREM4
MEDICI
interface state density
carrier mobility
remote coulomb scattering
Opis:: The evaluation of the world's first MOSFETs with epitaxially-grown rare-earth high-k gate dielectrics is the main issue of this work. Electrical device characterization has been performed on MOSFETs with high-k gate oxides as well as their reference counterparts with silicon dioxide gate dielectric. In addition, by means of technology simulation with TSUPREM4, models of these devices are established. Current-voltage characteristics and parameter extraction on the simulated structures is conducted with the device simulator MEDICI. Measured and simulated device characteristics are presented and the impact of interface state and fixed charge densities is discussed. Device parameters of high-k devices fabricated with standard poly-silicon gate and replacement metal gate process are compared.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 2; 78-85
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 91.

Tytuł:: Application of neutron activation for investigation of Fe3O4 nanoparticles accumulation by plants
Autorzy:: Bystrzejewska-Piotrowska, G.
Asztemborska, M
Stęborowski, R.
Polkowska-Motrenko, H.
Danko, B.
Ryniewicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/146840.pdf
Data publikacji:: 2012
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: iron (II,III) oxide
nanoparticles
neutron activation
plants
Opis:: As a result of the rapid development of nanotechnology and increasing application of nanoproducts in many areas of everyday life, there is a growing risk of production of nanowastes potentially dangerous for the environment. This makes it necessary to investigate the accumulation and toxicity of nanoparticles (NPs) at different trophic levels. In the studies neutron activation was applied for the investigation of iron (II,III) oxide nanoparticle (Fe3O4-NPs) accumulation by Lepidium sativum and Pisum sativum L. Plants were cultivated on growth medium contaminated with different concentrations (0.01-10 mmolźL-1) of Fe3O4-NPs. For the identification of the presence of Fe3O4-NPs in plant tissues gamma spectrometry following iron oxide (II,III) nanoparticles irradiation was applied. Both plant species were found to accumulate iron (II,III) oxide nanoparticles. The highest content of NPs was found in plant roots, reaching 40 g/kg for Pisum sativum L. More than 90% of accumulated NPs were found in roots. Accumulation of Fe3O4-NPs was found to depend on the concentration of nanostructures in the growth medium. The transfer factor for Lepidium sativum roots and shoots and Pisum sativum L. shoots decreased with increasing NP concentration in the medium; for Pisum sativum L. roots the tendency was reversed. Neutron activation of nanoparticles was shown to be a powerful tool for tracing the environmental fate of NPs and their uptake and accumulation in organisms.
Źródło:: Nukleonika; 2012, 57, 3; 427-430
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 92.

Tytuł:: Bentonite Modification with Manganese Oxides and Its Characterization
Modyfikacja bentonitu tlenkami manganu i ich charakterystyka
Autorzy:: Dolinska, S.
Schutz, T.
Znamenackova, I.
Lovas, M.
Vaculikova, L.
Powiązania:: https://bibliotekanauki.pl/articles/319089.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Przeróbki Kopalin
Tematy:: bentonit
nitryfikacja
tlenek manganu
bentonite
nitrification
manganese oxide
Opis:: The paper describes the preparation of new composite based on relatively cheap natural materials from domestic deposits and synthetically prepared manganese oxides. At first the natural bentonite was simple chemically modified by natrification. In general, bentonite is a rock with dominant presence of clay minerals from the smectite group, mainly montmorillonite. The properties of bentonite result from the crystal structure of this group. The particles of montmorillonite have negative charges on their faces due to isomorphic substitutions in structure. The natrification salt Na2CO3 is used almost exclusively thanks to its financial accessibility. The significant changes of surface properties after the modification of bentonite were observed. Natrification increased the surface area of bentonite. Then the manganese oxides were precipitated on the surface of activated sodium bentonite particles. The structural changes of bentonite, before and after its modification, were studied by X-ray diffraction analysis and FTIR spectroscopy. The morphology of the bentonites was observed by scanning electron microscopy. X-ray diffraction analysis demonstrated that the structural changes in the bentonite after natrification, the related exchange of Ca2+ cation for Na+ in the inter-layer space of the montmorillonite structure. Manganese oxide (MnO2) with regular birnessite layer structure was present in all of the bentonite samples of modified manganese.
W pracy opisywano proces uzyskiwania nowej mieszaniny opartej na naturalnych i stosunkowo tanich materiałach ze złóż krajowych i syntetycznie przygotowanych tlenków manganu. Początkowo, naturalny bentonit był chemicznie modyfikowany przez nitryfikację. Bentonit to skała z przeważającą obecnością minerałów z grupy smektytu, głównie montmorillonitu. Właściwości bentonitu wynikają ze struktury krystalicznej. Cząsteczki montmorillonitu posiadają ładunek ujemny, co jest spowodowane izomorficznymi substytutami w strukturze. Sól nitryfikująca (Na2CO3) jest stosowana z uwagi na niską cenę. Zaobserwowano znaczące zmiany we właściwościach powierzchniowych, które zaszły po modyfikacji bentonitu. Nitryfikacja zwiększyła powierzchnię bentonitu. Kolejnym krokiem była modyfikacja powierzchni bentonitu, aktywowanego sodem, tlenkami manganu. Zmiany strukturalne – przed i po modyfikacji – były przeanalizowane przy użyciu dyfrakcji rentgenowskiej i spektroskopii FTIR. Morfologię bentonitów zbadano przy pomocy mikroskopu elektronowego. Analiza wyników dyfrakcji rentgenowskiej wykazała zmiany strukturalne w bentonicie po nitryfikacji, oraz związaną z tym wymianę kationu Ca2+na Na+ w przestrzeni międzywarstwowej w strukturze montmorillonitu. Tlenek manganu (MnO2) z regularną strukturą warstwy birnezytu był obecny we wszystkich próbkach bentonitu modyfikowanego manganem.
Źródło:: Inżynieria Mineralna; 2015, R. 16, nr 2, 2; 213-218
1640-4920
Pojawia się w:: Inżynieria Mineralna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 93.

Tytuł:: Structural and optical properties of nanostructured bismuth oxide
Autorzy:: Ali, R. S.
Powiązania:: https://bibliotekanauki.pl/articles/412556.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: thin films’ bismuth oxide
optical properties
structural properties
Opis:: Thin films of bismuth oxide have been prepared utilizing vacuum evaporation. XRD anyalysis reveal that all the films were tetragonal polycrystalline structure with a preferred orientation along (002) plane. SEM images indicate that the grain size fall in the category of nanosize. AFM results assure that the nanonstructure behavior of thin films. Optical studies show that these films have a direct transition with optical energy gap equal to 2.5 eV.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2014, 15; 64-72
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 94.

Tytuł:: Hafnium Oxide as Efficient Material for a New Generation Dielectric
Autorzy:: Mukhachov, A.
Kharitonova, O.
Terentieva, O.
Powiązania:: https://bibliotekanauki.pl/articles/1029657.pdf
Data publikacji:: 2018-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: Hafnium oxide
extraction
phase
dielectric
centrifugal extractors
extractant
Opis:: In the early 2000-ies, world leaders in the field of computer engineering, such companies as IBM, Intel and Samsung Electronics announced the development of a new technology for the production of boards based on multilayer films HfO₂-Al₂O₃ on a silicon pad using the method of atomic layer deposition. The board has a high dielectric constant value thus making it possible to produce smaller transistors with increased operational speed, to reduce leakage current and electric energy consumption. It has been known that hafnium oxide is used in the production of optical devices, resistors, electronic ceramics, neutron absorption compositions, and catalysts. High purity of material is one of key conditions for its application. As source material, hafnium concentrate was used that was enriched to 10% in the form of K₂(ZrHf)F₆ salt - the product of fractional crystallization of zirconium and hafnium fluorides in the production of zirconium for nuclear applications. Another source material is a HFO₂ commercial-grade hafnium oxide produced at Vilnogorsk Mining and Smelting Works. Key process stages are fusion with alkali at a temperature of 800°C, dissolution in nitric acid and extraction. The impurities content of resultant hafnium re-extract is 10-5% (mass). The prime objective of the process technology is the preservation of hafnium purity in its oxide production, which is attained by the application of materials and equipment items having a high corrosion resistance, such as stainless steel, crucibles made of high-purity silicon, reaction vessels made of zirconium and fluoroplastic. Centrifugal extractors allow the key critical process of hafnium extraction purification to be sufficiently effective, resulting in obtaining the product of a required 99.99% purity. Physical properties of hafnium oxide are presented in sufficient detail in. Hafnium oxide can by produced using various methods to be selected based on the requirements to product quality, process efficiency and cost considerations.
Źródło:: Acta Physica Polonica A; 2018, 133, 4; 778-780
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 95.

Tytuł:: Copper (II) Oxide particles as Adsorbent for Removal of Alkali Blue; Isotherm and Kinetic Studies
Autorzy:: Ibrahim, M. A.
Ibrahim, M. B.
Powiązania:: https://bibliotekanauki.pl/articles/1158766.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Adsorption
Copper (II) Oxide particles
FTIR
Isotherm
Kinetics
Opis:: Adsorption behaviour of copper (II) oxide particles (CuO-Ps) for the removal of Alkali Blue (AB) was studied. Different adsorption variables such as contact time, initial concentration and pH for the adsorption process were investigated by batch adsorption studies. FTIR was carried out to determine the functional groups present at the surface of the particle with functional groups such as –OH, C=C, C-H, C≡C detected. The percentage removal and optimum contact time for the removal of AB was 84.8% at 10 min. The experimental isotherms data were analyzed using Langmuir, Temkin, Freundlich and Dubinin-Radushkevich (D-R) isotherms and it was observed that AB fits closely to Langmuir with R2 value of 0.884. Kinetics studies shows that the adsorption process fits better to pseudo-second order with the experimental values of qe 4.242 been closer to the calculated values of the qe 4.108. Effect of pH shows that it adsorb better at the initial pH of 5.30. Lower value of mean square energy of 0.707 kJ/mol indicates that the adsorption process is physical. The results indicated that copper (II) oxide particle can be used as a low-cost adsorbent for the removal of AB from aqueous solutions.
Źródło:: World Scientific News; 2018, 114; 208-217
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 96.

Tytuł:: Nitric oxide and platelet energy metabolism.
Autorzy:: Tomasiak, Marian
Stelmach, Halina
Rusak, Tomasz
Wysocka, Jolanta
Powiązania:: https://bibliotekanauki.pl/articles/1041559.pdf
Data publikacji:: 2004
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: mitochondrial energy production
porcine platelets
nitric oxide
glycolysis
Opis:: This study was undertaken to determine whether nitric oxide (NO) can affect platelet responses through the inhibition of energy production. It was found that NO donors: S-nitroso-N-acetylpenicyllamine, SNAP, (5-50 μM) and sodium nitroprusside, SNP, (5-100 μM) inhibited collagen- and ADP-induced aggregation of porcine platelets. The corresponding IC50 values for SNAP and SNP varied from 5 to 30 μM and from 9 to 75 μM, respectively. Collagen- and thrombin-induced platelet secretion was inhibited by SNAP (IC50 = 50 μM) and by SNP (IC50 = 100 μM). SNAP (20-100 μM), SNP (10-200 μM) and collagen (20 μg/ml) stimulated glycolysis in intact platelets. The degree of glycolysis stimulation exerted by NO donors was similar to that produced by respiratory chain inhibitors (cyanide and antimycin A) or uncouplers (2,4-dinitrophenol). Neither the NO donors nor the respiratory chain blockers affected glycolysis in platelet homogenate. SNAP (20-100 μM) and SNP (50-200 μM) inhibited oxygen consumption by platelets. The effect of SNP and SNAP on glycolysis and respiration was not reduced by 1H-[1,2,4]oxadiazolo-[4,3-a]quinoxalin-1-one, a selective inhibitor of NO-stimulated guanylate cyclase. SNAP (5-100 μM) and SNP (10-300 μM) inhibited the activity of platelet cytochrome oxidase and had no effect on NADH:ubiquinone oxidoreductase and succinate dehydrogenase. Blocking of the mitochondrial energy production by antimycin A slightly affected collagen-evoked aggregation and strongly inhibited platelet secretion. The results indicate that: 1) in porcine platelets NO is able to diminish mitochondrial energy production through the inhibition of cytochrome oxidase, 2) the inhibitory effect of NO on platelet secretion (but not aggregation) can be attributed to the reduction of mitochondrial energy production.
Źródło:: Acta Biochimica Polonica; 2004, 51, 3; 789-803
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 97.

Tytuł:: Monitoring of urine nitric oxide (NO) related substrates and immunological competence in hematological malignancy.
Autorzy:: Tanaka, Junko
Koshimura, Kunio
Tsumori, Michihiro
Murakami, Yoshio
Kato, Yuzuru
Powiązania:: https://bibliotekanauki.pl/articles/1043832.pdf
Data publikacji:: 2002
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: pokeweed mitogen
hematological malignancy
urine nitric oxide
phytohemagglutinin
Opis:: It has been reported that concentrations of neopterin in the urine are changed according to the host immunological conditions. In the present study, we measured urinary concentration of neopterin in patients with malignant hematological disorders and investigated the relationship between urinary neopterin levels and laboratory indices for cellular immunity. Urine neopterin levels were correlated with serum sIL-2R levels in the patients with malignant lymphoma, and inversely correlated with lymphocyte reactivity with ConA in the patients with acute myelocytic leukemia. However, no significant correlation was observed between urine neopterin levels and lymphocyte reactivity with phytohemagglutinin and pokeweed mitogen, CD4/8 ratio, CD56+16+ subset or serum IFN-β levels. In the patients with malignant lymphoma, parallel changes in serum sIL-2R and urine neopterin were observed. The presented results suggest that urine neopterin levels are related to the activation of T cells in malignant lymphoma.
Źródło:: Acta Biochimica Polonica; 2002, 49, 1; 227-232
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 98.

Tytuł:: Pilot Plant Studies on No_x Removal Via No Ozonation and Absorption
Badania w skali pilotowej dotyczące efektywności usuwana NOx porzez utlenianie NO i absorpcję
Autorzy:: Kordylewski, W.
Jakubiak, M.
Hardy, T.
Powiązania:: https://bibliotekanauki.pl/articles/205030.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nitric oxide
ozonation
absorption
tlenek azotu
ozonowanie
absorpcja
Opis:: The results of experimental investigations on the removal of NOx from gases applying ozone as the oxidizing agent and the absorption of higher nitrogen oxides in the sodium hydroxide solutions are presented. The experiment was conducted using a pilot plant installation with the air flow rate 200 m3/h, being a prototype of a boiler flue gas duct and a FGD scrubber. It was shown that in the range of [NOref] = 50 ÷ 250 ppm the mechanism of NO ozonation depends on the molar ratio X = O3/NOref: for X ≤ 1.0 oxidation of NO to NO2 predominates and NO2 is poorly absorbed, for X >> 1.0 NO2 undergoes further oxidation to N2O5, which is efficiently absorbed in the scrubber. The stoichiometric molar ratio of complete conversion of NO into N2O5 is X = 1.5, in these studies to reach the effectiveness η ≥ 90% the molar ratio X was much higher (2.75).
Przedstawiono wyniki badań doświadczalnych dotyczące usuwania NOx z gazów z zastosowaniem ozonu jako utleniacza i absorpcji wyższych tlenków azotu w roztworach wodorotlenku sodu. Badania prowadzono na strumieniu powietrza 200 m3/h w instalacji pilotowej będącej prototypem instalacji kotłowej odprowadzenia spalin i skrubera IOS. Wykazano, że w zakresie [NOref] =50÷250 ppm mechanizm ozonizacji NO zależy od stosunku molowego X = O3/NOref: dla X ≤ 1.0 przeważa utlenianie NO do NO2 a NO2 jest słabo absorbowany, dla X >> 1,0 NO2 ulega dalszemu utlenianiu do N2O5, który jest efektywnie absorbowany w skruberze. Stosunek molowy przy całkowitej konwersji NO do N2O5 wynosi X = 1.5, w przeprowadzonych badaniach, aby osiągnąć efektywność η ≥ 90% stosunek X był dużo większy (2,75).
Źródło:: Archives of Environmental Protection; 2013, 39, 3; 93-106
2083-4772
2083-4810
Pojawia się w:: Archives of Environmental Protection
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 99.

Tytuł:: Structure studies of porous oxide layers formed on 13CrMo4-5 steels long-term operated in the power industry
Autorzy:: Gwoździk, M.
Powiązania:: https://bibliotekanauki.pl/articles/298175.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:: 13CrMo4-5 steel
oxide layer
porosity
Opis:: The paper contains results of studies on the formation of oxide layers on 13CrMo4-5 steel long-term operated at an elevated temperature. The material studied comprised specimens of 13CrMo4-5 steel operated at the temperature of 455oC during 130,000 hours (steel 1) and 540oC during 120,000 hours (steel 2). The oxide layer was studied on a surface and a cross-section at the outer surface of the tube wall. The paper contains results of studies of porosity in the oxide layer. The oxide layer formed on the studied steel 1 is ~146 μm thick, while on the steel 2 ~248 μm. It has been found that steel 2 has higher porosity.
Źródło:: Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(3); 257-266
1505-4675
2083-4527
Pojawia się w:: Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 100.

Tytuł:: Fire resistance of roofs with loadbearing wooden beams and fire protective claddings made of magnesium oxide boards
Nośność ogniowa stropów drewnianych z elementami nośnymi w postaci belek drewnianych w okładzinach z płyt magnezowych
Autorzy:: Roszkowski, P.
Sulik, P.
Powiązania:: https://bibliotekanauki.pl/articles/7509.pdf
Data publikacji:: 2014
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:: fire resistance
roof
wooden beam
magnesium oxide board
Źródło:: Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2014, 87
1898-5912
Pojawia się w:: Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:: Biblioteka Nauki

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