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Wyświetlanie 1-15 z 89
Tytuł:
Optical and Structural Studies of Sol-Gel Deposited Nanostructured CdO Thin Films: Annealing Effect
Autorzy:
Abdolahzadeh Ziabari, A.
Ghodsi, F.
Powiązania:
https://bibliotekanauki.pl/articles/1493680.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
78.66.Li
78.67.-n
81.20.Fw
Opis:
Nanocrystalline CdO thin films were prepared by sol-gel dip-coating method using a different solution. The as-deposited films were subjected to drying temperature of 120° in air. The prepared films were annealed in different temperatures of 200, 300 and 400°C. The characterization of samples was carried out by X-ray diffraction, scanning electron microscopy and UV-VIS spectroscopy. Results show that the samples are polycrystalline in nature and the crystallinity of the films improves with temperature. The average grain size is in the range of 19-34 nm. It was observed that the optical parameters of the films were affected by annealing temperature.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 536-540
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and mechanical properties of Al-Li alloys as cast
Autorzy:
Augustyn-Pieniążek, J.
Adrian, H.
Rzadkosz, S.
Choroszyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/383253.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Li alloy
aerospace industry
precipitation hardening
stop Al-Li
przemysł lotniczy
utwardzanie wydzieleniowe
Opis:
The high mechanical properties of the Al-Li-X alloys contribute to their increasingly broad application in aeronautics, as an alternative for the aluminium alloys, which have been used so far. The aluminium-lithium alloys have a lower specific gravity, a higher nucleation and crack spread resistance, a higher Young’s module and they characterize in a high crack resistance at lower temperatures. The aim of the research planned in this work was to design an aluminium alloy with a content of lithium and other alloy elements. The research included the creation of a laboratorial melt, the microstructure analysis with the use of light microscopy, the application of X-ray methods to identify the phases existing in the alloy, and the microhardness test.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2; 5-10
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Response of La$\text{}_{1-x}$MnO$\text{}_{3}$/Al$\text{}_{2}$O$\text{}_{3}$ Films
Autorzy:
Babonas, G.-J.
Reza, A.
Szymczak, R.
Baran, M.
Fröhlich, K.
Jasutis, V.
Diduszko, R.
Powiązania:
https://bibliotekanauki.pl/articles/2035658.pdf
Data publikacji:
2003-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Li
75.70.Ak
Opis:
La$\text{}_{1-x}$MnO$\text{}_{3}$ films grown by metal organic chemical vapor deposition technique on r-plane cut Al$\text{}_{2}$O$\text{}_{3}$ substrates were investigated. The change of the optical response over the La$\text{}_{1-x}$MnO$\text{}_{3}$/Al$\text{}_{2}$O$\text{}_{3}$ sample surface was investigated along with the temperature dependence of magnetization. The mostly pronounced difference in the spectra of dielectric function occurred in the region of the d-d transitions of Mn-ions. The changes in the optical spectra and magnetic properties were correlated to the structural features of thin film.
Źródło:
Acta Physica Polonica A; 2003, 103, 1; 77-83
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonant Two-Electron Pairs in a Simple Cubic Lattice
Autorzy:
Bak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1374452.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
31.15.xh
71.10.Li
71.55.-i
03.65.Ge
02.30.Zz
Opis:
The properties of resonant two-electron pairs are examined in three-dimensional simple cubic extended Hubbard tUW model, in s- and d- symmetry channels, in the limit of empty lattice. Lattice Green function technique is applied to calculate the scattering amplitude by means of matrix for any energy in the band on ΓR line within the Brillouin zone. The analysis shows the persistence of resonant states even for Coulomb interactions so weak that the equation for the resonant states is not formally fulfilled. The difference in behavior of resonances controlled by on-site and intersite Coulomb interactions is found. The ranges of applicability of approximate formula for the actual position of resonant peak and its width are shown.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-63-A-69
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Akumulatory litowe jako współczesne systemy magazynowania energii
Lithium batteries as modern energy storage systems
Autorzy:
Bakierska, M.
Chojnacka, A.
Powiązania:
https://bibliotekanauki.pl/articles/171974.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
akumulator litowy
materiał anodowy
materiały katodowe
elektrolity
Li-ion batteries
anode material
cathode material
electrolytes
Opis:
Due to the need for comprehensive management of energy resources, the storage of energy becomes an increasingly important issue. From the analysis of the advantages and drawbacks of all methods of energy storage, reversible electrochemical cells seem to be the most effective. Among them, rechargeable lithium batteries are characterized by high energy density (Fig. 1), high voltage and good cyclic stability [7]. Thus, they have been a dominant technology of energy storage systems for over a decade. It is expected that market demand for Li-Ion cells in the coming years will grow at a rapid rate, as a result of their widespread use inter alia in portable electronic devices such as mobile phones, smartphones, tablet PCs and laptops (Fig. 2) [9]. This article presents the characteristics of lithium batteries. The most commonly used cathode material in Li-Ion battery is layered cobalt oxide (130 mAh/g). However, it is expensive and toxic material, thus manganese-based compounds (LiMnO2, LiMn2O4), polyanionic olivine structured materials (LiFePO4) and silicates Li2MSiO4 (M = Mn, Co, Fe) gain an increasing interest. Due to the presence of two lithium ions in the structure of silicates, these materials have a high theoretical capacity, reaching about 300 mAh/g (Tab. 2) [1, 7–9, 11, 12]. Commercially used anode material is graphite (372 mAh/g). Nevertheless, scientists are still looking for new anode materials with a higher gravimetric capacity. Researches are primarily focused on modifications of the graphite or the use of lithium alloys with other elements (Sn, Al, Si) (Tab. 3) [1, 9, 12, 14, 15]. In the Lithium-Ion cells only non-aqueous solutions are used in the character of electrolytes. As a best material, the inorganic electrolyte lithium salts (such as LiBr, LiAsF6, LiPF6, LiBF4, etc.) soluble in organic solvents are used [1, 2, 7, 8]. However, the study on alternative solutions (polymer electrolytes) is very important. Continuous technological progress makes the research on improving the reversible electrochemical cells necessary to fulfill the expectations of users in order to improve the quality of their lives.
Źródło:
Wiadomości Chemiczne; 2014, 68, 9-10; 856-871
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical and experimental analysis of isothermal forging process of ribbed plates made of 2099 aluminium alloy for aircraft structures
Analiza numeryczna i doświadczalna procesu kucia izotermicznego płyt żebrowanych ze stopu aluminium 2099 do konstrukcji lotniczych
Autorzy:
Baran-Sadleja, A.
Łukaszek-Sołek, A.
Motyka, M.
Powiązania:
https://bibliotekanauki.pl/articles/175707.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FEM numerical simulation
isothermal forging
Al-Cu-Li-Zn-Mg alloys
microstructure
aircraft structures
symulacja numeryczna MES
kucie izotermiczne
stopy Al-Cu-Li-Zn-Mg
mikrostruktura
konstrukcje lotnicze
Opis:
The analysis of isothermal forging process of ribbed plates made of multicomponent (Al-Cu-Li-Zn-Mg system) third generation 2099 aluminium alloy is presented in the paper. Numerical simulation of forging was performed by finite elements method (FEM) using the QForm v.7 commercial software. Obtained results were the base for selection of conditions of isothermal forging for examined aluminium alloy. It was assumed in the work that ribbed plates could be produced by one-step forging. The isothermal forging at the temperature of 450ºC was conducted on designed test bed. Satisfactory shape accuracy and high quality surface of the forging were found. Evaluation of alloy’s microstructure before (T-83 condition) and after forging was performed by microscopic examination. It was found that obtained results of numerical simulation and experimental research can be a base for elaboration of industrial process of plastic forming of complex geometry flat structural parts made of 2099 aluminium alloy.
W pracy przedstawiono analizę wyników badań procesu kucia izotermicznego płyt żebrowanych z wieloskładnikowego (układ Al-Cu-Li-Zn-Mg) stopu aluminium trzeciej generacji 2099. Symulacje numeryczne kucia wykonano metodą elementów skończonych (MES) z zastosowaniem komercyjnego programu QForm v.7. Uzyskane wyniki były podstawą doboru warunków próby kucia izotermicznego badanego stopu aluminium. W badaniach przyjęto założenie, że jest możliwe kucie matrycowe płyt żebrowanych wykonanych w jednej operacji. Próbę kucia izotermicznego w temperaturze 450ºC prowadzono na zaprojektowanym stanowisku badawczym. Stwierdzono zadowalającą dokładność kształtu i wysoką jakość powierzchni wykonanej odkuwki. W badaniach mikroskopowych dokonano oceny mikrostruktury stopu przed (w stanie T-83) i po procesie kucia. Stwierdzono, że wyniki symulacji numerycznej i badań eksperymentalnych mogą stanowić podstawę opracowania warunków przemysłowego kształtowania plastycznego panelowych elementów konstrukcyjnych o złożonej geometrii ze stopu aluminium 2099.
Źródło:
Advances in Manufacturing Science and Technology; 2016, 40, 3; 61-72
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Remarks on the Symmetry Kernel Test
Uwagi o jądrowym teście symetryczności
Autorzy:
Baszczyńska, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/905773.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
kernel method
symmetry
Li symmetry test
triple test
Gupta symmetry test
Opis:
The paper presents chosen statistical tests used to verify the hypothesis of the symmetry of random variable’s distribution. Detailed analysis of the symmetry kernel test is made. The properties of the regarded symmetry kernel test are compared with the other symmetry tests using Monte Carlo methods. The symmetry tests are used, as an example, in analysis of the distribution of the Human Development Index (HDI).
W pracy przedstawiono wybrane statystyczne testy wykorzystywane w weryfikacji hipotezy o symetryczności rozkładu zmiennej losowej. Szczegółowej analizie poddano test symetryczności oparty o metodę jądrową. Porównano własności zaprezentowanych testów symetryczności oraz zastosowano je go analizy rozkładu wskaźnika rozwoju społecznego (HDI).
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2013, 285
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Microstructure and Mechanical Properties of Magnesium Alloys Mg-Li-RE After the Process of Casting and Extrusion
Autorzy:
Bednarczyk, I.
Kuc, D.
Mikuszewski, T.
Powiązania:
https://bibliotekanauki.pl/articles/353094.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultra-light Mg-Li-RE alloys
extrusion process
microstructure
mechanical properties
Opis:
The article presents tests results of the influence of extrusion process on the microstructure and mechanical properties of magnesium alloy with lithium and rare earth elements with symbols LAE442 and LAE842. Microstructures of magnesium alloys after extrusion were compared with microstructure after casting and homogenisation. Presented results show the mechanical properties marked in static compression test in room temperature. It was stated that alloy LAE842 is characterised with better plasticity than the alloy LAE442.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 35-38
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of the Microstructure and Properties of Mg-Li Magnesium Alloy after Deformation by the KoBo Method
Autorzy:
Bednarczyk, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/2134107.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Mg-Li alloys
metod SPD
static compression test
microstructure
Opis:
The article presents the results of tests of plastic shaping of magnesium alloy Mg-Li. Magnesium alloy for an extrusion process was obtained with the method of vacuum smelting and casting into graphite moulds. The materials for tests were slabs cast from magnesium alloys with symbols: Mg-4%Li-1%Ca (LX41). Before the process of deformation the castings were subject to homogenization. Conventional extrusion tests were conducted in a complex state of deformation (KoBo method). An assessment was performed of the influence of the deformation process parameters on the structure and properties of the tested alloy. Results of mechanical tests were presented both for static compression test in room temperature. On the basis of the achieved tests results, the susceptibility to plastic working for the Mg-4%Li-1%Ca alloy was determined. An analysis of the microstructure was conducted both in the initial condition and after plastic deformation with the use of light and scanning microscopy techniques. The applied deformation methods allowed the determination of the influence of process parameters on changes in the microstructure and properties of the Mg-4%Li-1%Ca alloy.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1179--1184
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion behaviour of binary Mg-Li alloys for plastic forming
Autorzy:
Białobrzeski, A.
Saja, K.
Żmudzińska, M.
Powiązania:
https://bibliotekanauki.pl/articles/380767.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultralight Mg-Li alloy
alkaline corrosion
acid media
stop ultralekki Mg-Li
korozja alkaliczna
środowisko kwaśne
Opis:
The paper outlines the course of corrosion processes in magnesium and Mg-Li alloys. The methodology of corrosion studies of alloys for plastic forming and their chemical composition as well as micrographs of alloys intended for research are presented.
Źródło:
Archives of Foundry Engineering; 2011, 11, 3 spec.; 15-20
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Registration of melting and crystallization process of ultra-light weight MgLi12,5 alloy with use of ATND method
Autorzy:
Białobrzeski, A.
Pezda, J.
Powiązania:
https://bibliotekanauki.pl/articles/382851.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stop magnezu
krystalizacja
stop Mg-Li
metoda ATD
metoda ATND
magnesium alloys
crystallization
Mg-Li alloy
ATD method
ATND method
Opis:
To the main advantages of magnesium alloys belongs their low density, and just because of such property the alloys are used in aviation and rocket structures, and in all other applications, where mass of products have significant importance for conditions of their operation. To additional advantages of the magnesium alloys belongs good corrosion resistance, par with or even surpassing aluminum alloys. Magnesium is the lightest of all the engineering metals, having a density of 1.74 g/cm3. It is 35% lighter than aluminum (2.7 g/cm3) and over four times lighter than steel (7.86 g/cm3). The Mg-Li alloys belong to a light-weight metallic structural materials having mass density of 1.35-1.65 g/cm3, what means they are two times lighter than aluminum alloys. Such value of mass density means that density of these alloys is comparable with density of plastics used as structural materials, and therefore Mg-Li alloys belong to the lightest of all metal alloys. In the present paper are discussed melting and crystallization processes of ultra-light weight MgLi12,5 alloys recorded with use of ATND methods. Investigated magnesium alloy was produced in Krakow Foundry Research Institute on experimental stand to melting and casting of ultra-light weight alloys. Obtained test results in form of recorded curves from ATND methods have enabled determination of characteristic temperatures of phase transitions of the investigated alloy.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 143-146
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of corrosion behaviour in acid environment of binary Mg-Li alloys for plastic forming
Autorzy:
Białobrzeski, A.
Saja, K.
Żmudzińska, M.
Powiązania:
https://bibliotekanauki.pl/articles/380235.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultralight Mg-Li alloy
corrosion behaviour
acid media
stop ultralekki Mg-Li
zachowanie korozyjne
środowisko kwaśne
Opis:
The article discusses studies and corrosion tests of binary Mg-Li alloys for plastic forming examined in an acid medium (5% HCl solution) for the time of 0-144 hours. In short it can be stated that corrosion of the examined Mg-Li alloys in 5% HCl solution proceeded in a similar mode in all the studied alloys, regardless of the lithium content.
Źródło:
Archives of Foundry Engineering; 2011, 11, 3 spec.; 25-28
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of corrosion behaviour in alkaline environment of binary Mg-Li alloys for plastic forming
Autorzy:
Białobrzeski, A.
Saja, K.
Żmudzińska, M.
Powiązania:
https://bibliotekanauki.pl/articles/381197.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultralight Mg-Li alloy
alkaline corrosion
plastic forming
stop ultralekki Mg-Li
korozja alkaliczna
obróbka plastyczna
Opis:
The article discusses studies and corrosion tests of binary Mg-Li alloys for plastic forming examined in an alkaline medium (5% NaCl solution) for the time of 0-144 hours. In short it can be stated that the increase of Li content in magnesium alloys from 3% to 9% increases the corrosion resistance of alloy (the lowest susceptibility to corrosion in NaCl solution showed Mg- Li9 alloy). Increasing the content of Li in alloy to over 9% resulted in a significant increase of the susceptibility to corrosion.
Źródło:
Archives of Foundry Engineering; 2011, 11, 3 spec.; 21-24
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Features and Mechanical Properties after Applying Rolling with Cyclic Movement of Rolls of an Al-Li Alloys
Autorzy:
Brzezińska, A.
Urbańczyk-Gucwa, A.
Molak, R.
Rodak, K.
Powiązania:
https://bibliotekanauki.pl/articles/352162.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Li alloy
severe plastic deformation
ultrafine-grains
STEM
SEM/EBSD
Opis:
Two strength-age hardening aluminum-lithium alloys: Al-2.3wt%Li and Al-2.2wt%Li-0.1wt%Zr in two different heat treatment conditions: solution state (S) and additionally in aging state (A) were severely plastically deformed by rolling with cyclic movement of rolls (RCMR) method to produce ultrafine - grained structure. Two thermo-mechanical treatments were used: (S+A+RCMR) and (S+RCMR+A+RCMR). To investigate the combined effect of plastic deformation and heat treatment, tensile tests were performed. Microstructural observations were undertaken using scanning transmission electron microscopy (STEM), and scanning transmission electron microscopy (SEM) equipped with electron backscattering diffraction detector (EBSD). Based on the obtained results, it can be deduced that maximum mechanical properties as: yield strength (YS) and ultimate tensile strength (UTS) couldbe achieved when the microstructure of alloys is in (S+A+RCMR) state. For samples in (S+RCMR+A+RCMR) state, ductility is higher than for (S+A+RCMR) state. The microstructural results shows that the favourable conditions for decreasing grain size of alloys is (S+A+RCMR) state. Additionally, in this state is much greater dislocation density than for (S+RCMR+A+RCMR) state. The microstructure of alloys in (S+RCMR+A+RCMR) state is characterized by grains/subgrains with higher average diameter and with higher misorientation angles compared with (S+A+RCMR) state.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1533-1540
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recykling akumulatorów litowo-jonowych na potrzeby gospodarki o obiegu zamkniętym
Li-ion batteries recycling for circular economy approach
Autorzy:
Charzewska, Karolina
Powiązania:
https://bibliotekanauki.pl/articles/2200600.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
zamknięty obieg pierwiastków
recykling
akumulatory litowo-jonowe
magazynowanie energii
gospodarka o obiegu zamkniętym
zielona chemia
closed cycle of elements
recycling
Li-ion batteries
energy storage
circular economy
green chemistry
Opis:
Recycling of lithium-ion batteries is a response to the exploitation of natural resources of elements necessary for the production of energy storage devices and the desire to close the cycle of elements by reducing their loss. The replacement of fossil fuels by renewable energy sources will require batteries capable of storing significant amounts of energy. The effects of scientific projects on this subject are not limited to the research sphere, but have real economic, political and social consequences: independence from the supply of raw materials from distant areas or reduction of human rights violations in the case of conflict elements. Ethical and ecological supply of elements is regulated by the EU and the US, among others. Based on these premises, the article collects information on the recycling process and production of lithium-ion cells in order to illustrate the current market situation and highlight places where there are opportunities to introduce new solutions or improve processes with emphasis on the model of a circular economy.
Źródło:
Wiadomości Chemiczne; 2022, 76, 1-2; 59-78
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
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