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Tytuł:
Tolerancja szczepu bakterii Cupriavidus metallidurans na jony metali
Bacterium Cupriavidus metallidurans strains tolerance of metal ions
Autorzy:
Vojtkova, H.
Janulkova, R.
Svanova, P.
Powiązania:
https://bibliotekanauki.pl/articles/318868.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
biomineralizacja
opór metalu
tolerancja
Cupriavidus metallidurans
biomineralization
metal resistance
tolerance
Opis:
W doświadczeniu eksperymentalnie zbadano tolerancję szczepu bakterii Cupriavidus metallidurans CCM 7663 na wybrane stężenie jonów metalu. Wyniki pokazują bardzo dobrą tolerancję na jony Ni2+, Cd2+, Ag+, Pb2+, Mg2+, Fe2+, Cu2+. Zidentyfikowane wartości tolerancji uzupełniono przez właściwości fizjologiczne szczepu oznaczając w ten sposób możliwość zastosowania bakterii w procesach aktywnej biomineralizacji i metodach biotechnologicznych przetwarzania rud i odzysku trudno dostępnych metali.
The study experimentally examines the tolerance of the bacterium Cupriavidus metallidurans strain CCM 7663 of the selected ion metal concentration. The results show a very good metallic tolerance of Ni2+, Cd2+, Cr3+, Ag+, Pb2+, Mg2+, Fe2+, Cu2+ ions. The identified tolerance values are complemented by the physiological properties of the strain and thus imply its possible application in the processes of active biomineralization and biotechnological methods of ore processing and retrieval of rare or less available metals.
Źródło:
Inżynieria Mineralna; 2012, R. 13, nr 2, 2; 49-54
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Heavy Metals on Development of Metal Resistance in Soil Microbiota
Wpływ metali ciężkich na rozwój odporności na zawartość metali w mikroflorze w glebie
Autorzy:
Timkova, Ivana
Pevna, Viktoria
Pristas, Peter
Sedlakova-Kadukova, Jana
Powiązania:
https://bibliotekanauki.pl/articles/971193.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
metale ciężkie
mikroflora gleby
odporność na zawartość metali
heavy metals
soil microbiota
metal resistance
Opis:
Heavy metal pollution caused by anthropogenic activity is a great concern of the present days. Widespread use of substances containing metals inevitably lead to their deposition in soil affecting soil microbiota, which plays important role in maintaining soil functions. The aim of our study was to determine number of heavy metal resistant isolates acquired from the soil from heavy metal polluted area of dump near Hnúšťa. Soil samples were obtained from two collection sites (48° 36´ 4,47502´´ N, 19° 57´32,654´´ E and 48° 36´ 4,4634´´ N, 19° 57´ 32,67´´ E) and mixed together. The microorganisms used in this study were routinely cultivated and screened for resistance to different concentrations of four heavy metals – Zn (2–500 mg/l), Cu, Ni, Pb (all three metals tested at concentrations from 0,5 to 125 mg/l). Very high resistance against Cu, Ni and Pb even at the highest tested concentrations was found at majority of tested bacterial strains. Almost all 89 from 89 isolates show resistance against these metals at tested concentrations. Only in case of Zn we determined the MIC (minimal inhibitory concentration) – 125 mg/l. The results point out very high resistance pattern in soil bacteria.
Zanieczyszczenie metalami ciężkimi wywołane działalnością antropogeniczną jest wielkim problemem współczesności. Powszechne stosowanie substancji zawierających metale nieuchronnie prowadzi do ich odkładania się w glebie co wpływa na mikroflorę glebową, która odgrywa ważną rolę w utrzymywaniu funkcji gleby. Celem badań było określenie liczby izolatów odpornych na metale ciężkie pozyskanych z gleby z zanieczyszczonego obszaru składowiska metali ciężkich w pobliżu Hnúšťa. Próbki gleby pobrano z dwóch miejsc (48° 36' 4,47502'' N, 19° 57'32,654'' E i 48° 36' 4,4634''bN, 19° 57'32,67'' E) i wymieszano razem. Mikroorganizmy wykorzystane w tym badaniu były rutynowo hodowane i badane pod kątem odporności na różne stężenia czterech metali ciężkich: Zn (2–500 mg/l), Cu, Ni, Pb (wszystkie trzy badane metale w stężeniach od 0,5 do 125 mg/l). Bardzo wysoką odporność na Cu, Ni i Pb nawet przy najwyższych testowanych stężeniach stwierdzono w większości badanych szczepów bakteryjnych. Prawie wszystkie z 89 izolatów wykazują odporność na te metale w testowanych stężeniach. Tylko w przypadku Zn określiliśmy MIC (minimalne stężenie hamujące) = 125 mg/l. Wyniki wskazują na bardzo wysoki wzór oporności w bakteriach glebowych.
Źródło:
Inżynieria Mineralna; 2019, 21, 1; 111-114
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Issledovanie vlijanija korrozionnojj sredy na treshhinostojjkost metalla ehkspluatiruemykh neftjanykh rezervuarov
Research of influence of corrosion environment on crack resistance of metal of operated oil tanks
Autorzy:
Makarenko, V.
Murav'ev, K.
Evpak, T.
Kalivoshko, H.
Powiązania:
https://bibliotekanauki.pl/articles/76970.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
crack resistance
corrosion
metal
oil tank
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 3
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion and thermal shock resistance of metal (Cu, Al) matrix composites reinforced by SiC particles
Autorzy:
Strojny-Nędza, A.
Egizabal, P.
Pietrzak, K.
Zieliński, R.
Kaszyca, K.
Piątkowska, A.
Chmielewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/200646.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal-matrix composites
silicon carbide
wear resistance
corrosion
thermal shocks
Opis:
This paper presents the results of studies concerning the production and characterization of Al-SiC/W and Cu-SiC/W composite materials with a 30% volume fraction of reinforcing phase particles as well as the influence of corrosion and thermal shocks on the properties of selected metal matrix composites. Spark plasma sintering method (SPS) was applied for the purpose of producing these materials. In order to avoid the decomposition of SiC surface, SiC powder was coated with a thin tungsten layer using plasma vapour deposition (PVD) method. The obtained results were analysed by the effect of the corrosion and thermal shocks on materials density, hardness, bending strength, tribological and thermal properties. Qualitative X-ray analysis and observation of microstructure of sample surfaces after corrosion tests and thermal shocks were also conducted. The use of PVD technique allows us to obtain an evenly distributed layer of titanium with a constant thickness of 1.5 µm. It was found that adverse environmental conditions and increased temperature result in a change in the material behaviour in wear tests.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1227-1236
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New colorant metal complexes, derivatives of 1,2–diazoxy–4–naphthalenesulfonic acid and pentane-2,4-dione. Part I. Preparation and properties
Autorzy:
Wasilewska, A.
Maćkowska, E.
Urbaniak, W.
Powiązania:
https://bibliotekanauki.pl/articles/347021.pdf
Data publikacji:
2013
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
colorants
asymmetric metal complexes
heteroleptic complexes
resistance to UV radiation
acetylacetone
Opis:
A vast array of colorants used in various industries include metal complex colorants, which are useful mainly in the textile industry. Substances to be used in fiber dyeing are expected to have optimum properties, therefore, such compounds remain to be of interest to researchers. The results of studies on the possible modifications of known colorants are presented in this paper.
Źródło:
Ars Separatoria Acta; 2012-2013, 9/10; 95-102
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure, Hardness and Wear Resistance of Local TiC-ZrO2/FeCr Reinforcement Fabricated in Situ in Steel Castings
Autorzy:
Sobula, S.
Olejnik, E.
Kurtyka, P.
Szymański, Ł.
Tokarski, T.
Powiązania:
https://bibliotekanauki.pl/articles/355914.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wear resistance
composite casting
TiC reinforced cast steel
metal matrix composites
Opis:
Wear resistance of TiC-ZrO2-Fe locally reinforced steel casting has been investigated. Composites were obtained by introducing to mould cavity compact with TiC reaction substrates, ZrO2 particles and addition of moderator. Casting with local reinforcement – composite zone was obtained. Structure and microstructure of composite zone were investigated with use of X-ray diffraction (XRD) and scanning electron microscope (SEM) methods. The Miller slurry machine and Ball-on-Disc tester were used to determine wear resistance of the fabricated locally reinforced TiC-ZrO2-Fe composites. The worn surface of specimens after test, was studied by SEM. Due to the presence of TiC and ZrO2 particles in composite zone steel castings exhibited higher abrasion resistance than chromium white cast iron with Ni addition Ni-Hard 1 type and comparable with composites with high TiC content.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 119-124
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the mathematical models of distillation equilibria for designing the differential distillation process
Autorzy:
Sobczak, E.
Ringel, T.
Łataś, R.
Powiązania:
https://bibliotekanauki.pl/articles/346973.pdf
Data publikacji:
2013
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
colorants
asymmetric metal complexes
heteroleptic complexes
resistance to UV radiation
acetylacetone
Opis:
This paper presents the development of mathematical models for positive and negative azeotropes in the range of the more volatile concentrations component: x∈[0; az] ∨ [az; 1]. The coefficients of these models, which, on their basis, were determined the relative volatility of α and the azeotrope concentration az, defined with the high accuracy (R2∈[0,926; 0,999]) and presented them to the table for all subjects of distillation systems. Based on these relationships, the integration of the mass balance equations of the distillation differential process d(Sx)=ydS was carried out and determined the dependence of the distillate obtained from 1 mole of pig iron D/S0 from the α, az coefficients and xw, xs concentrations. Based on these dependencies, charts D/S0 were prepared from predefined by the authors parameter t=[0,05; 0,25; 0,5; 0,75] which is the change in the concentration of pig iron in the process of concentration. Dependencies, presented for distillation balances of positive and negative azeotrope, in the tested ranges, for similar values of α, have the same mileage. The calculations were made for the 126 distillation systems.
Źródło:
Ars Separatoria Acta; 2012-2013, 9/10; 103-116
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oddziaływanie przeciwdrobnoustrojowych peptydów z jonami metali : relacja między chemią koordynacyjną, strukturą, termodynamiką a sposobem działania
The interaction of antimicrobal peptides with metal ions : the relationship between coordination chemistry, structure, thermodynamics and mode of action
Autorzy:
Dudek, Dorota
Garstka, Kinga
Miller, Adriana
Dzień, Emilia
Wątły, Joanna
Hecel, Aleksandra
Kozłowski, Henryk
Rowińska-Żyrek, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2200586.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
antimicrobial peptides
metal coordination
antibiotic resistance
peptydy przeciwdrobnoustrojowe
koordynacja metali
antybiotykooporność
Opis:
Increasing bacterial and fungal drug resistance makes novel, effective antimicrobial treatments actively sought. Because of the general lack of resistance towards antimicrobial peptides (AMPs), they are being relied on as a novel class of therapeutics aimed to conquer drug-resistant bacteria and fungi. There are numerous ways in which AMPs might interact with pathogens, such as membrane disruption, production of reactive oxygen species, inhibition of cell wall, nucleic acid and protein synthesis or by the withdrawal of essential metal ions. Biologically indispensable metal ions, such as Zn(II) and Cu(II), which are the key players of this project, have a dual effect on the activity of antimicrobial peptides: (i) AMPs bind them, so that microbes cannot get enough metals essential for their life and virulence (withdrawal of metal ions, nutritional immunity) or (ii) AMPs need the given metal ion as a booster of their antimicrobial activity (metal ions affect the AMP charge and/or structure). In this chapter, we discuss the impact of the coordination of Cu(II) and Zn(II) to several antimicrobial peptides, focusing on the thermodynamics, structure and coordination chemistry. The comparison of these data to the outcome of biological growth studies (determination of minimal inhibitory concentration (MIC) of metalAMP complexes and their derivatives allows to draw conclusions about the relationship between the metal-antimicrobial peptide complex structure, stability mode of action and efficacy. In the nearest future, the most efficient complexes may serve as templates for a rational design of novel, more potent AMP-based therapeutics. Further improvement can be reached through the modification of the most promising AMP complexes using (i) specifically targeted antimicrobial peptides, in which the AMP will be covalently linked to a targeting peptide (Figure 1) or (ii) chimeric compounds comprising AMPs bound to conventional antimicrobials or peptidomimetic modifications (Figure 2).
Źródło:
Wiadomości Chemiczne; 2022, 76, 5-6; 365--391
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Wear Resistance of Functional Composite Polymeric Materials and Durability of Metal-Polymer Bearings
Autorzy:
Chernets, Myron
Świć, Antoni
Kornienko, Anatolii
Yurchuk, Alina
Powiązania:
https://bibliotekanauki.pl/articles/2201913.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
polyamides
wear resistance
composites
dry sliding friction
metal-polymer plain bearings
durability
Opis:
A method of tribological testing of models with such sliding friction using a simple pin-on-disc mechanism was presented. Wear resistance indicators of unfilled polyamides PA6, PA66 and composites based on polyamide PA6+30GF, PA6+30CF, PA6+MoS2, PA6 and oil coupled with steel C45 are determined. They, as polymeric materials with the property of self-lubrication, they are often used in metal-polymer dry friction bearings. Based on them, wear resistance characteristics of these polymeric materials at sliding friction are established. They are used as basic parameters for developed by authors mathematical model of material wear kinetics at sliding friction and analytical research method of metal-polymer sliding bearings research. For comparative assessment of wear resistance of the investigated polymeric materials, their wear resistance diagrams are constructed. Thef show the functional dependence of wear resistance on specific friction forces. It is proved that the wear resistance of materials nonlinearly depends on specific pressure, i.e., the specific friction forces. Qualitative and quantitative influence of the type and structure of fillers (which improve the tribological properties of the base polymer PA6) on their wear resistance has been established. The forecast estimation of durability of metal polymer bearings made of the specified polyamides by the author's method of calculation taking into account their various wear resistance, characteristics of elasticity and conditions of dry friction is carried out. The research results are presented graphically, which facilitates their understanding and analyses.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 258--267
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of nanoparticles reinforcements on the mechanical performance and tribological properties of aluminum 6082 alloys
Autorzy:
Al-Obaidi, Anwer J.
Tariq, Abdalameer
Dalfi, Hussein
Powiązania:
https://bibliotekanauki.pl/articles/38890058.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
Al6082 alloy
SiC nanoparticles
tensile strength
wear resistance
metal matrix composite
Opis:
This research investigates the effect of using hard ceramic SiC particles on the mechanical and tribological properties of Al6082 alloy. This investigation is performed by mixing various contents of SiC as weight percentages of 0, 1, 2, 3, and 4% with Al6082. Mechanical tests, such as tensile strength and hardness tests, are adopted for this composite (Al6082/SiC) at various contents of the filler (SiC). Besides, the wear test is conducted for the Al6082/SiC composite at various normal loads (10, 15, 20, 25, and 30 N) and sliding distances (200, 400, 600, 800, and 1000 m). Taguchi’s approach is used to create the experimental runs’ matrix. The findings reveal that the mechanical properties improved with increasing the percentage of SiC reinforcement. The tensile strength and Rockwell hardness of Al6082 increased by about 24.6 and 14%, respectively, using 4% of SiC particles. Regarding the tribological behavior, the average wear of Al6082 alloy decreased with increasing the percentage of SiC reinforcement due to higher hardness of reinforcement in Al6082/SiC composite. At the same time, an increase in the normal load and sliding distance led to a decrease in wear due to increasing plastic deformation at elevated loadings and larger area contacts.
Źródło:
Engineering Transactions; 2022, 70, 4; 391-405
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser soldered packaging hermeticity measurement using metallic conductor resistance
Autorzy:
Seigneur, F.
Maeder, T.
Jacot, J.
Powiązania:
https://bibliotekanauki.pl/articles/378447.pdf
Data publikacji:
2006
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
Tematy:
packaging process
laser soldered
laser diode
oxidation of a heated metal
resistance of the conductor
Opis:
Packaging is the las step of the manufacturing processes of microsystems. The LPM is working on the development of a two-part soldered packaging. One part of the package is metallic; the other part is made of glass. The goal of the project is to solder the two parts of the package using a laser diode. The advantage of the laser soldered joint are its hermeticity to water and air in regard to glue and plastics, as well as the possibility to heat only the soldered joint, without affecting its contents. This work presents results of this packaging process, together with a method used to measure the hermeticity based on the oxidation of a heated metal conductor such as tungsten. The resistance of the conductor, which is encapsulated inside the package, increases as oxygen and water diffuse through the seal, which provides a convenient semi-quantitative measurement.
Źródło:
Electron Technology : Internet Journal; 2005-2006, 37/38, 8; 1-5
1897-2381
Pojawia się w:
Electron Technology : Internet Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rasčët toka dvuhfaznogo korotkogo zamykaniâ na zemlû sučëtom harakteristik zazemleniâ oborudovaniâ
Calculation of two-phase ground fault current with consideration of equipment grounding specifications
Autorzy:
Kosjakow, A.
Suhoguzow, A.
Powiązania:
https://bibliotekanauki.pl/articles/312527.pdf
Data publikacji:
2018
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
prąd zwarciowy
przewód uziemiający
rezystancja uziemienia
rezystancja połączenia metalowego
opór cieplny
ground fault current
grounding electrode
grounding resistance
metal connection
thermal resistance
Opis:
V statʹe opisany sposoby rasčëta toka dvuhfaznogo korotkogo zamykaniâ na zemlû v èlektričeskih setâh s izolirovannoj nejtralʹû dlâ celej ocenki termičeskoj stojkosti zazemlâûŝih provodnikov i zazemlite učityvaûŝie harakteristiki zazemleniâ oborudovaniâ – soprotivlenie zazemlâûŝego ustrojstva i soprotivlenie metallosvâzi oborudovaniâ s zazemlâûŝim ustrojstvom. Vyvedeny novye formuly dlâ rasčëta tokov dvuhfaznogo korotkogo zamykaniâ na zemlû i opredelena ih oblastʹprimeneniâ.
The article describes ways of calculating two-phase ground fault current in electrical networks with isolated neutral for needs of calculating thermal resistance in equipment's grounding elements. Grounding resistance and metal resistance of high-voltage equipment are added to the existing methods of short circuit currents calculation.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 12; 468-473
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Remelting of the Ni-22Cr-9Mo Alloy on its Microstructural and Electrochemical Properties
Autorzy:
Augustyn-Nadzieja, J.
Łukaszczyk, A.
Loch, J.
Powiązania:
https://bibliotekanauki.pl/articles/351218.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ni-Cr-Mo alloys
metal prosthetics restorations
method melted models
artificial saliva solution
corrosion resistance
Opis:
The Ni-Cr-Mo alloys are used as the alternative for the cobalt alloys in the manufacture of metal prosthetic elements, i.e. crowns, bridges and frame prostheses. The article attempts at a materials science characterization of the nickel-based alloy of the commercial name Argeloy N.P Be-Free by Argen. Within the study, examinations were made on the commercial alloy as well as the alloy which was remelted and cast by the los mould (lost wax) method. Observations of the microstructure were performed with the use of optical and electron scanning microscopy. Also, X-ray structural tests were conducted as well as corrosion resistance tests in an artificial saliva solution (pH = 6,7). It was demonstrated that the examined Ni-22Cr-9Mo alloy characterized in a dendritic structure typical of the cast materials. The X-ray qualitative phase analysis revealed the phase γ'(Ni) in both examined materials, as well as the presence of Cr23C6 type carbides and Nb2C, Ta2C (commercial alloy) and NbC, Ta4C0,04 (cast alloy) phases. The effect of the alloy’s remelting and the morphology of the passive layer on the corrosion resistance of the Ni-Cr-Mo alloy was examined. The results of the electrochemical tests show that the process of re-casting only slightly affects the corrosion resistance and the microstructure of the considered alloy. The roles of recasting process and the passive film homogeneity on the corrosion resistance of Ni-Cr-Mo dental alloy were reviewed. The results the electrochemical study show that the dependence of corrosion resistance on the microstructure associated with the recasting process is marginal.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 411-418
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semiconductor contact layer characterization in a context of hall effect measurements
Autorzy:
Kowalewski, Andrzej
Wróbel, Jarosław
Boguski, Jacek
Gorczyca, Kinga
Martyniuk, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/220890.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal contact
contact layer
contact resistance
Hall effect
resistivity
van der Pauw method
MSM structure
semiconductors’ characterization
Opis:
A revision of the standard approach to characterization of thin-semiconductor-layer Hall samples has been proposed. Our results show that simple checking of I(V) curve linearity at room temperature might be insufficient for correct determination of bias conditions of a sample before measurements of Hall effect. It is caused by the nonlinear behaviour of electrical contact layers, which should be treated together with the tested layer a priori as a metal-semiconductor-metal (MSM) structure. Our approach was examined with a Be-doped p-type InAs epitaxial layer, with four gold contacts. Despite using full high-quality photolithography a significant asymmetry in maximum differential resistance (Rd) values and positions relative to zero voltage (or current) value was observed for different contacts. This suggests that such characterization should be performed before each high-precision magneto-transport measurement in order to optimize the bias conditions.
Źródło:
Metrology and Measurement Systems; 2019, 26, 1; 109-114
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of the Addition of Zeolite Particles on the Performance Characteristics of Sintered Copper Matrix Composites
Wpływ dodatku cząstek zeolitu na właściwości eksploatacyjne spiekanego kompozytu o osnowie miedzi
Autorzy:
Kargul, M.
Borowiecka-Jamrozek, J.
Konieczny, M.
Powiązania:
https://bibliotekanauki.pl/articles/190340.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
sinter
copper
zeolite
metal matrix composite
wear resistance
spiek
miedź
zeolit
kompozyt z metalową osnową
odporność na zużycie ścierne
Opis:
The paper presents the results of research on the possibilities of producing and using copper–zeolite composites obtained by powder metallurgy. The zeolite powder (0.0–0.2 mm fraction) used in the experiments was ground tuff rock extracted from the Kucin Quarry (VSK PRO-ZEO s.r.o.) in Slovakia. The as-delivered material was imaged and analysed using the SEM/EDS and XRD techniques. Before the sintering process, one-sided pressing was applied to the hydraulic press at a pressure of 620 MPa. The sintering process was carried out in a laboratory tube furnace at 900°C in an atmosphere of dissociated ammonia. The sintering time was 60 minutes. The resulting agglomerates were subjected to the following tests: measurements of density, hardness, electrical conductivity, and abrasion resistance. Observations of the microstructure on metallographic specimens made from the sintered samples were also performed using a scanning electron microscope (SEM). Zeolite was introduced into the copper matrix in the amounts of 2.5, 5, 7.5, and 10% by weight. The introduction of zeolite particles into the matrix as the strengthening phase caused an increase in the hardness of sinters while lowering a density and electrical conductivity. The introduction of zeolite particles caused a decrease in abrasion resistance for a composite containing up to 7.5% zeolite. The increase in abrasion resistance was observed for the composite containing 10% zeolite particles.
W pracy przedstawiono wyniki badań nad możliwościami wytwarzania i zastosowania kompozytu miedź– –zeolit otrzymanego za pomocą technologii metalurgii proszków. Proszek zeolitu (frakcja 0.0–0.2 mm) wykorzystany do badań pozyskano ze skały zwanej tufem zeolitowym, wydobywanej w kopalni Kucice, (VSK PRO-ZEO s.r.o.), Słowacja. Proszek zeolitu został poddany obserwacjom SEM/EDS oraz rentgenowskiej analizie fazowej XRD. Przed procesem spiekania zastosowano jednostronne prasowanie na prasie hydraulicznej przy ciśnieniu prasowania 620 MPa. Proces spiekania przeprowadzono w laboratoryjnym piecu rurowym w temp 900°C w atmosferze zdysocjowanego amoniaku. Czas spiekania wynosił 60 minut. Wytworzone spieki poddano następującym badaniom: pomiarowi gęstości, twardości, przewodności elektrycznej oraz odporności na zużycie ścierne. Przeprowadzono również obserwacje mikroskopowe zgładów metalograficznych wykonanych z badanych spieków z użyciem skaningowego mikroskopu elektronowego (SEM). Zeolit wprowadzono do miedzianej osnowy w ilościach 2,5, 5, 7,5, 10% wagowych. Wprowadzenie do osnowy cząstek zeolitu jako fazy umacniającej spowodowało podwyższenie twardości spieków, natomiast obniżenie gęstości i przewodności elektrycznej. Wprowadzenie cząstek zeolitu w ilości do 7,5% spowodowało obniżenie odporności na zużycie ścierne. Wzrost odporności na zużycie ścierne zaobserwowano dla kompozytu zawierającego 10% zeolitu.
Źródło:
Tribologia; 2018, 282, 6; 51-62
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 30

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