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Wyświetlanie 1-15 z 15
Tytuł:
Application of Ammoniacal Solutions for Leaching and Electrochemical Dissolution of Metals from Alloys Produced from Low-Grade E-Scrap
Autorzy:
Rudnik, E.
Powiązania:
https://bibliotekanauki.pl/articles/350950.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alloy
electrolysis
leaching
recovery
e-scrap
Opis:
Paper reports results of the research on the application of ammoniacal solutions (sulfate, chloride, carbonate) for hydrometallurgical treatment of smelted low-grade e-waste. Two Cu-Zn-Sn-Ag-Pb alloys were analyzed in details and discussed. Leaching of copper from the alloys was slow in sulfate solution, but the dissolution rate decreased in chloride and carbonate baths. Anodic alloys dissolution was uniform in sulfate and carbonate electrolytes, but high degradation of the material was observed in chloride bath. Chemical and phase composition of slimes and cathodic deposits produced during electrolysis were characterized. In all cases, separation of copper from other metals was found, but efficiencies of the processes were low.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1681-1688
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovery of Zinc from Steelmaking Flue Dust by Hydrometallurgical Route
Autorzy:
Rudnik, E.
Powiązania:
https://bibliotekanauki.pl/articles/352319.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
EAF dust
leaching
electrowinning
recycling
Opis:
Industrial steelmaking (EAF) flue dust was characterized in terms of chemical and phase compositions, leaching behaviour in 20% sulphuric acid solution as well as leaching thermal effect. Waste product contained about 43% Zn, 27% Fe, 19% O, about 3% Pb and Mn and lesser amounts of other elements (Ca, Si, Mo, etc.). It consisted mainly of oxide-type compounds of iron and zinc. Dissolution of metals (Zn, Fe, Mn) from the dust was determined in a dependence of solid to liquid ratio (50-200 g/L), temperature (20-80°C) and leaching time (up to 120 min). The best result of 60% zinc recovery was obtained for 50 g dust/L and a temperature of 80°C. Leaching of the material was an exothermic process with a reaction heat of about –318 kJ/kg. Precipitation purification of the solution was realized using various ratios of H2 O2 to NH3aq . A product of this stage was hydrated iron(III) oxide. Final solution was used for zinc electrowinning. Despite that pure zinc was obtained the highest cathodic current efficiency was only 40%.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 601-608
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Językoznawstwo slawistyczne na początku XXI wieku (przez pryzmat prac w tomie ofiarowanym Profesorowi Janowi Sokołowskiemu)
Slavic linguistics at the beginning of the 21st century (trough the prism of articles in the volume dedicated to the Professor Jan Sokołowski)
Autorzy:
Rudnik-Karwatowa, Zofia
Powiązania:
https://bibliotekanauki.pl/articles/1375708.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Slavic studies
Slavic languages
jubilee volume
word
sentence
description of the language
comparative study of language
translation.
slawistyka
języki słowiańskie
Sokołowski Jan
księga jubileuszowa
wyraz
zddanie
opis języka
konfrontacja językowa
przekład
Opis:
The jubilee volume “Slavica Wratislaviensia”, CLIX: Wyraz i zdanie w językach słowiańskich (8), is a collection of contributions by pupils, collegues, and friends, dedicated to Professor Jan Sokołowski slavist of Wroclaw University, on the occasion of his 70th birthday. The publication topics covered subjects connected with researches on word and sentence in Slavic languages, their description, comparative and contrastive studies, and translation. They take up important current topics, reliably and comprehensively analyze problems that have not been noticed before or have not been solved yet. Due to the selection of topics and high scientific level (most authors are renowned linguists) the volume should be considered as representative for contemporary Slavic linguistics.
Źródło:
Rocznik Slawistyczny; 2018, 67; 180-188
0080-3588
Pojawia się w:
Rocznik Slawistyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cyclic voltammetric studies of tellurium in diluted HNO3 solutions
Woltamperometryczne badania telluru w rozcieńczonych roztworach HNO3
Autorzy:
Rudnik, E.
Sobesto, J.
Powiązania:
https://bibliotekanauki.pl/articles/351112.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tellur
badania woltamperometryczne
pH
tellurium
cyclic voltammetry
Opis:
Electrochemistry of tellurium stationary electrode was studied in nitric acid solutions of pH 2.0 and 2.5. Two sparingly soluble products were formed at potentials above 200 mV (SCE): TeO2 and H2TeO3. H2TeO3 and TeO2 could dissolve to HTeO+2 under acidic electrolyte, but this process was hindered at pH 2.5. Cathodic polarization of tellurium electrode below -800 mV was accompanied by evolution of H2Te, which was then oxidized at the potentials approx. -700 mV.
Przeprowadzono elektrochemiczne badania zachowania się telluru w roztworach kwasu azotowego(V) o pH 2,0 i 2,5. Produktami utleniania telluru przy potencjałach powyżej 200 mV (wzgl. NEK) są słabo rozpuszczalne związki TeO2 i H2TeO3. TeO2 i H2TeO3 ulegają wtórnemu rozpuszczaniu w roztworze kwaśnym z utworzeniem HTeO+2, przy czym proces ten jest hamowany przy pH 2,5. W warunkach polaryzacji katodowej tellur metaliczny redukuje się do H2Te (przy potencjałach poniżej -800 mV), który utlenia się przy potencjale ok. -700 mV.
Źródło:
Archives of Metallurgy and Materials; 2011, 56, 2; 270-277
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Studies on the Codeposition of Antimony and Tin from Acidic Chloride and Sulfate-Chloride Solutions
Autorzy:
Rudnik, E.
Kostępski, M.
Powiązania:
https://bibliotekanauki.pl/articles/352105.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
antimony
electrolysis
speciation
tin
voltammetry
Opis:
Codeposition of antimony and tin from acidic chloride and chloride-sulfate baths was investigated. The calculations of distribution of species showed domination of neutral SnCl2 and anionic SbCl4 - complexes in chloride solution, while in the presence of sulfate ions neutral SnSO4 and cationic SbCl2+ complexes were found. Cyclic voltammetry, anodic stripping analysis and potentiostatic measurements showed that antimony deposited favorably and the reaction run under limiting control. Analysis of chronoamperometric curves suggested instantaneous nucleation of the solid phase in the chloride bath, but progressive model was more probable in the presence of sulfate ions.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 709-717
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrochemical Studies of Lead Telluride Behavior in Acidic Nitrate Solutions
Elektrochemiczne badania tellurku ołowiu w kwaśnych roztworach azotanowych
Autorzy:
Rudnik, E.
Biskup, P.
Powiązania:
https://bibliotekanauki.pl/articles/356953.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lead telluride
cyclic voltammetry
pH
nitric acid
tellurek ołowiu
woltamperometria cykliczna
kwas azotowy
Opis:
Electrochemistry of lead telluride stationary electrode was studied in nitric acid solutions of pH 1.5-3.0. E-pH diagram for Pb-Te-H2O system was calculated. Results of cyclic voltammetry of Pb, Te and PbTe were discussed in correlation with thermodynamic predictions. Anodic dissolution of PbTe electrode at potential approx. -100÷50 mV (SCE) resulted in tellurium formation, while above 300 mV TeO2 was mainly produced. The latter could dissolve to HTeO+2 under acidic electrolyte, but it was inhibited by increased pH of the bath.
Przeprowadzono elektrochemiczne badania zachowania się tellurku ołowiu w roztworach kwasu azotowego(V) o pH 1,5-3,0. Obliczono diagram równowagi E-pH dla układu Pb-Te-H2O. Przedyskutowano wyniki pomiarów woltamperometrii cyklicznej Pb, Te i PbTe w odniesieniu do przewidywań termodynamicznych. Produktem utleniania tellurku ołowiu przy potencjałach ok. -100÷50 mV (NEK) jest tellur, natomiast powyżej 300 mV tworzy się przede wszystkim 2, który ulega wtórnemu rozpuszczaniu w roztworze kwaśnym z utworzeniem HTeO+2. Proces jest hamowany przez wzrost pH elektrolitu.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 1; 95-100
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on Cementation of Tin on Copper and Tin Stripping from Copper Substrate
Autorzy:
Rudnik, E.
Sikora, P.
Powiązania:
https://bibliotekanauki.pl/articles/352941.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tin
copper
cementation
stripping
Opis:
Cementation of tin on copper in acid chloride-thiourea solutions leads to the formation of porous layers with a thickness dependent on the immersion time. The process occurs via Sn(II)-Cu(I) mechanism. Chemical stripping of tin was carried out in alkaline and acid solutions in the presence of oxidizing agents. It resulted in the dissolution of metallic tin, but refractory Cu3Sn phase remained on the copper surface. Electrochemical tin stripping allows complete tin removal from the copper substrate, but porosity and complex phase composition of the tin coating do not allow monitoring the process in unambiguous way.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 593-598
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Probabilistic fuzzy approach to evaluation of logistics service effectiveness
Autorzy:
Rudnik, K.
Pisz, I.
Powiązania:
https://bibliotekanauki.pl/articles/406962.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fuzzy expert systems
fuzzy hybrid systems
probabilistic fuzzy systems
probability of fuzzy event
logistics company
logistics service provider
logistics service
effectiveness
Opis:
Logistics service providers offer a whole or partial logistics business service over a certain time period. Between such companies, the effectiveness of specific logistics services can vary. Logistics service providers seek the effective performance of logistics service. The purpose of this paper is to present a new approach for the evaluation of logistics service effectiveness, along with a specific computer system implementing the proposed approach - a sophisticated inference system, an extension of the Mamdani probabilistic fuzzy system. The paper presents specific knowledge concerning the relationships between effectiveness indicators in the form of fuzzy rules which contain marginal and conditional probabilities of fuzzy events. An inference diagram is also shown. A family of Yager’s parameterized t-norms is proposed as inference operators. It facilitates the optimization of system parameters and enables flexible adjustment of the system to empirical data. A case study was used to illustrate the new approach for the evaluation of logistics service effectiveness. The approach is demonstrated on logistics services in a logistics company. We deem the analysis of a probabilistic fuzzy knowledge base to be useful for the evaluation of effectiveness of logistics services in a logistics company over a given time period.
Źródło:
Management and Production Engineering Review; 2014, 5, 4; 66-75
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy approach using experts’ psychological conditions to estimate the criteria importance for the assessment of innovative projects risk
Autorzy:
Deptuła, A. M.
Rudnik, K.
Powiązania:
https://bibliotekanauki.pl/articles/407147.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Fuzzy Multiple Criteria Decision Making
FMCDM
fuzzy Analytic Hierarchy Process
fuzzy AHP
group decision making
innovative project
assessment of risk
psychological aspects
process of making decision
Opis:
The difficulty of innovation risk assessment makes it necessary to use a multi-criteria analysis. Innovative projects are related to unstructured problems and the uncertainty, therefore, the use of fuzzy logic in the innovation risk assessment is analyzed. This paper proposes a method of determining the weights of criteria in order to innovation risk assessment. The weights are determined by 5 general criteria and 14 detailed criteria of innovation risk assessment. The proposed method is an extension of the fuzzy AHP method. The extension consists in taking into consideration the group decision-making approach with experts’ psychological conditions. The groups of experts have been chosen based on an elaborated form. The form makes it possible to characterize the persons within the scope of different psychological conditions. The proposed method provides objective and rational decision-making. The paper presents also a comparison of results with the fuzzy AHP method without the group decision making. The weights obtained by the proposed method are more diversified and bring out the most important criteria.
Źródło:
Management and Production Engineering Review; 2018, 9, 1; 13-23
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Probabilistic-fuzzy knowledge-based system for managerial applications
Autorzy:
Rudnik, K.
Walaszek-Babiszewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/407276.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
system kierowniczy
system oparty na wiedzy
system rozmyty
knowledge-based system
fuzzy system
probability of fuzzy events
fuzzy association rules
manager decision
Opis:
The paper deals with an inference system with probabilistic-fuzzy knowledge base as a tool which can help users in analyzing complete uncertainty of real problems in the company using fuzzy sets and probability. In the mentioned system, knowledge is saved in the weighted IFTHEN fuzzy rules, where the weights constitute marginal probabilities of the fuzzy events in the antecedents and conditional probabilities of the fuzzy events in the consequents. Moreover, the paper presents a proposal of the use of fuzzy association rules as a method of automatic knowledge base extraction in the inference system. For this purpose a modification of the PF-Growth algorithm is described. A numerical example is analyzed by using wind speed prediction process. The correct estimation of wind speed, as the potential energy resource, is necessary for control of the wind turbine work and it is important for the localization process of wind turbines, production planning and estimating cost-effectiveness of such investments.
Źródło:
Management and Production Engineering Review; 2012, 3, 1; 49-61
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary Investigation on Leaching Behavior of Zinc ash
Autorzy:
Rudnik, E.
Włoch, G.
Szatan, L.
Powiązania:
https://bibliotekanauki.pl/articles/353814.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zinc ash
hydrometallurgy
leaching
recovery
Opis:
Oxide fraction of industrial zinc ash from hot dip galvanizing was characterized in terms of composition and leaching behaviour in 10% sulfuric acid solution. Waste product contained about 68% Zn, 6% Cl, 3% Al, 1% Fe, 0.7% Si, 0.5% Pb and minor percentages of other metals (Mn, Cu, Ti etc.). It consisted mainly of zinc oxide contaminated with metallic zinc, zinc hydroxide chloride and silica. Dissolution of the metals from the material was determined as a function of solid to liquid ratio (50-150 kg/m3), temperature (20°C and 35°C) and agitation rate (300 and 900 rpm). The best results (50 g/dm3 Zn(II) at 78% zinc recovery) were obtained for 100 kg/m3 and the temperature of 20°C. Increase in the agitation rate had weak effect on the zinc yield. The final solutions were contaminated mainly by Fe(II, III) ions. Leaching of the material was an exothermic process with the reaction heat of about 800 kJ/kg.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 801-807
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Codeposition of SiC particles with electrolytic nickel
Współosadzanie cząstek SiC z niklem w procesie elektrolizy
Autorzy:
Dobosz, I.
Rudnik, E.
Burzyńska, L.
Powiązania:
https://bibliotekanauki.pl/articles/351442.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
elektrochemia
kompozyt
nikiel
węglik krzemu
electrodeposition
composite
nickel
silicon carbide
Opis:
Ni/SiC composite coatings were produced by electrodeposition from chloride-sulphate bath. The effect of SiC concentration on the percentage of embedded particles at two current densities (0.75 and 1.50 Aźdm-2) was determined. SiC content in the nickel matrix was in the range of 13-23 vol%, but lower values were found for higher current density. Increased particles contents in the coatings practically did not change microhardness of deposits (approximately 300 HV), but it increased corrosion resistance. Morphology and particle distribution in the deposits was studied with optical and transmission electron microscopes. Specific surface charge of SiC particles as well as adsorption of Ni2+ions on the powder particles were also determined.
Powłoki kompozytowe Ni/SiC otrzymywano na drodze elektrolizy z zastosowaniem kąpieli chlorkowo-siarczanowej. Określono wpływ stężenia SiC na skład osadów katodowych uzyskiwanych przy dwóch gęstościach prądu (0.75 and 1.50 Aźdm-2). Udział SiC w osnowie niklowej wynosił 13-23 %obj., przy czym niższe zawartości stwierdzono w powłokach otrzymanych przy wyższej gęstości prądu. Wzrost zawartości fazy dyspersyjnej w osadach katodowych nie wpływa na mikrotwardość kompozytów (ok. 300 HV), następuje natomiast wzrost ich odporności korozyjnej. Morfologię powierzchni i rozkład cząstek dyspersyjnych w osnowie niklowej określano na podstawie obserwacji mikroskopowych. Wyznaczono ładunek powierzchniowy cząstek SiC oraz wielkość adsorpcji jonów Ni2+.
Źródło:
Archives of Metallurgy and Materials; 2011, 56, 3; 665-670
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Potential-Current Conditions on the Electrodeposition of Ni-Sn Alloys from Acidic Chloride-Sulphate Solution
Wpływ warunków potencjałowo-prądowych na współosadzanie stopów Ni-Sn z kwaśnego roztworu chlorkowo-siarczanowego
Autorzy:
Rudnik, E.
Włoch, G.
Czarnecka, A.
Powiązania:
https://bibliotekanauki.pl/articles/352011.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrodeposition
nickel
tin
alloy
speciation
elektroliza
nikiel
cyna
stop
specjacja
Opis:
Ni - Sn alloys were electrodeposited from acidic chloride-sulphate solution in potentiostatic and galvanostatic conditions. Cyclic voltammetry and Hull cell were used for the selection of the appropriate deposition potentials and cathodic current densities, respectively. In the potentiostatic conditions (-1.0 - -1.2 V vs. Ag/AgCl) porous deposits (~7-10 wt% Ni) were obtained, while dense coatings (~15-34 wt% Ni) were produced in the galvanostatic conditions (0.5-1.5 A/dm2). In both cases, deposits consisted of β - Sn and Ni3Sn4 phases. Speciation of the bath was also calculated.
Stopy Ni - Sn osadzano katodowo z kwaśnego roztworu chlorkowo-siarczanowego w warunkach potencjostatycznych i galwanostatycznych. Warunki elektrolizy wytypowano na podstawie pomiarów chronowoltamperometrycznych i testów w komórce Hulla. W warunkach potenjostatycznych (-1.0- -1.2 V wzgl. Ag/AgCl) otrzymano warstwy porowate (7-10%mas Ni), natomiast w warunkach galwanostatycznych (0.5-1.5 A/dm2) tworzyły się warstewki zwarte (15-34%mas Ni). We wszystkich przypadkach uzyskano dwufazowe osady katodowe zawierające (β-Sn i Ni3Sn4. Obliczono także rozkład form jonowych w stosowanej kąpieli.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 1; 195-198
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-15 z 15

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