Skocz do pozycji: 1.

Tytuł:

BRICS in the G20? The Involvement of Rising Powers in the Premier Forum of Global Governance

Autorzy:

Rewizorski, Marek

Powiązania:

https://bibliotekanauki.pl/articles/2091837.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Warszawski. Wydział Nauk Politycznych i Studiów Międzynarodowych

Tematy:

International relations
Politics
Global management
G20 summits
Stosunki międzynarodowe
Polityka
Zarządzanie globalne
Szczyt G20

Opis:

Amongst the examples of structures filling up the spectrum of relationships between states and non-state actors in global governance, one can distinguish informal forums of international co-operation. The core position amongst them is occupied by the Group of Twenty (G20). This paper is devoted to the issue of the participation of BRICS in global governance institutions, above all the G20, which develops the summitry process at the political leader and ministerial levels. Attention is drawn to the BRICS group as the leading emerging economies and political powers at the regional and international levels, extending their influence within the G20. This paper highlights the increasing activity of emerging economies in this premier forum of global governance and explores the possibilities of BRICS members developing co-ordinated positions in the G20.(original abstract)

Źródło:

Stosunki Międzynarodowe - International Relations; 2016, 52, 1; 211-222
0209-0961

Pojawia się w:

Stosunki Międzynarodowe - International Relations

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Zadania instytucji sieci bezpieczeństwa finansowego w Polsce
Tasks of the financial safety net in Poland

Autorzy:

Strzelczyk, Małgorzata

Powiązania:

https://bibliotekanauki.pl/articles/953734.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

system
bezpieczeństwo
stabilność
finanse
instytucje
G20
G28

Opis:

The following article presents the main aspects of the financial safety net in Poland. Mainly, these are the institutional aspects, but also the legal aspects. Moreover, it was included in both the information on the rights and responsibilities of individual institutions, as well as how they function. Moreover, it realizes the significance of the activities of other entities in the financial system and their interrelationships. Working separately and also together as one body, prevent future crises and combat already present, as well as take care of the stability of the system and its continuous development.
Poniższy artykuł ma na celu przedstawienie głównych aspektów dotyczących sieci bezpieczeństwa finansowego w Polsce. W głównej mierze są to aspekty instytucjonalne, ale także aspekty prawne i finansowe. Ponadto, zawarte zostały w nim zarówno informacje dotyczące zakresu praw i obowiązków poszczególnych instytucji, jak również sposób ich funkcjonowania. Publikacja ma także na celu uświadomienie istotności działania danych jednostek w systemie finansowym i ich powiązań między sobą. Działając zarówno oddzielnie, jak i wspólnie jako jeden organ, zapobiegają przyszłym i zwalczają już obecne kryzysy, a także dbają o stabilność systemu i jego ciągły rozwój.

Źródło:

Finanse i Prawo Finansowe; 2016, 3, 4
2391-6478
2353-5601

Pojawia się w:

Finanse i Prawo Finansowe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Trade wars and the changing international order: a crisis of globalization?

Autorzy:

Mihaylov, Valentin
Sitek, Sławomir

Powiązania:

https://bibliotekanauki.pl/articles/1069035.pdf

Data publikacji:

2021

Wydawca:

Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych

Tematy:

Geoeconomics
geopolitics
globalization
G20
trade wars

Opis:

Increased geopolitical competition and growing economic nationalism after 2014 have gradually started to slow the trend of liberalization of international trade. Relations among certain national states have turned into trade wars – a hybrid phenomenon shaped at the intersection of geopolitics and geoeconomics. The paper explores global and regional trends in trade regulations introduced by the world’s largest economies and, at the same time, its major military powers. The G20 countries’ role in these processes was illustrated through references to empirical data on the dynamics of the introduced trade regulations in 2009–2018. The effectiveness of the regulations index is proposed. Apart from the harm that deepening such negative trends in the global geostrategic balance does to broader bilateral relations, the role of trade wars in re-shaping globalization’s established conditions is also discussed.

Źródło:

Miscellanea Geographica. Regional Studies on Development; 2021, 25, 2; 99-109
0867-6046
2084-6118

Pojawia się w:

Miscellanea Geographica. Regional Studies on Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Normatywne podstawy uczestnictwa Unii Europejskiej w G20

Autorzy:

Marek, Rewizorski,

Powiązania:

https://bibliotekanauki.pl/articles/894865.pdf

Data publikacji:

2020-03-21

Wydawca:

Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego

Tematy:

Unia Europejska
G20
globalne zarządzanie
zobowiązanie
reprezentacja

Opis:

This paper offers explanatory insight into the normative basis for the European Union’s participation in the G20, club of international cooperation perceived as a hub in the system of global governance. Despite a number of provisions of treaties, opinions and judgments of the ECJ governing the external dimension of the EU activity, presence of the EU in the G20 is based on informal basis, and its effectiveness is determined by arrangements between the Commission and the European Council. By investing in the paranormative model of representation in the G20, based on obscure delimitation of competences between the European Council and the Commission, the EU moved towards solutions that can be described as anomalies in a situation where each of the other members of the group strives to give its policy the greatest clarity and decisiveness. W artykule podjęto próbę eksplanacyjnego wglądu w normatywne podstawy uczestnictwa Unii Europejskiej w G20, klubie współpracy międzynarodowej uznawanym za centrum systemu global governance. Pomimo szeregu postanowień traktatowych, opinii i wyroków TSUE regulujących zewnętrzny wymiar aktywności UE, obecność Unii w G20 opiera się na nieformalnych podstawach, a jej skuteczność wyznaczają kompromisy między Komisją i Radą Europejską. Unia Europejska, inwestując w paranormatywny model reprezentacji w G20, oparty na niejasnej delimitacji kompetencji między Radą Europejską a Komisją, skłoniła się ku rozwiązaniom, które można by określić mianem anomalii w sytuacji, gdy każdy z pozostałych uczestników grupy dąży do nadania swojej polityce jak największej wyrazistości i decyzyjności.

Źródło:

Przegląd Europejski; 2016, 1 (39); 66-81
1641-2478

Pojawia się w:

Przegląd Europejski

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Japonia – nadzór korporacyjny i finanse publiczne
Japan – Corporate Governance and Public Finance

Autorzy:

Michalski, Kamil

Powiązania:

https://bibliotekanauki.pl/articles/945507.pdf

Data publikacji:

2012

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

nadzór korporacyjny
sektor finansów publicznych
gospodarka Japonii
JEL: G20
JEL: G28
JEL: G30
JEL: G38

Opis:

Japan ‒ the third economic power in the world – has been for over a decade, in a state of a prolonged stagnation spreading over the domains of its economy including the banking system. Japan’s participation in the II World War resulted in a humiliating defeat.. Japanese cities were completely demolished. Japanese industry and infrastructure were also totally destroyed. Yet, within the next two generations, Japan managed to succeed in economic achievements that were commonly known as “an economic miracle”. The completely ruined country, deprived of any natural resources, has become the world’s economic power, and the leader in many economic domains. The reason for is that Japanese people are characterized by strict obedience towards authorities, diligence, patience and a proper assessment of the post war political situation all over the world made by the Japanese government. Measured and systematic investments of the 60’s and 70’s of the 20th century, were carried out in traditional industries e.g.: metallurgy, textile industry, ship-building industry as well as more modern ones such as automobile and electronics industries. Good quality and reasonable prices of products soon gained popularity among external markets. During a rapid development of 1954-1971, Japan adopted an anti-import policy and closed its market for foreign goods. This policy as well as the well-thought-out strategy of development resulted in a dynamic economic development of the country. Therefore, Japan became an important Americanally in the geopolitical configuration of powers.

Źródło:

Gospodarka w Praktyce i Teorii; 2012, 1(30)
1429-3730
2450-095X

Pojawia się w:

Gospodarka w Praktyce i Teorii

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Analysis Of The Current Trends Of Gold And Foreign Exchange Reserves Of The G20 Countries

Autorzy:

Derkach, Tatyana

Powiązania:

https://bibliotekanauki.pl/articles/1402370.pdf

Data publikacji:

2020

Wydawca:

Wyższa Szkoła Ekonomiczno-Humanistyczna w Bielsku-Białej

Tematy:

gold and foreign exchange (international) reserves (gold reserves) of the G20 countries
19 countries of the Eurozone
rating of the G20 countries in terms of dynamics and variations in gold and FX reserves
pair correlation of changes in international reserves among the G20 countries

Opis:

During periods of instability, the availability of reserves in the national economy of a country, necessary to overcome crises and repay their negative effects, is of great importance. The economic policy of the G20 countries on the formation of international reserves will give us a general idea of the main trends in this direction. The change in the structure of gold and FX reserves among the group of G20 countries in 2007-2019 is analyzed, the average annual absolute level of gold reserves and their growth have been determined, the amplitude of fluctuations, average deviation and coefficient of variation of gold reserves of the G20 countries have been determined, based on the calculation of the pairwise linear correlation of the gold and foreign exchange dynamics between the G20 countries, the similarities and differences in the implementation of the state policy on international reserves management were determined.

Źródło:

MIND Journal; 2020, 10; 1-19
2451-4454

Pojawia się w:

MIND Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Preparation and Some Properties of Carbon Nanotubes

Autorzy:

Byszewski, P.
Ukalski, K.
Baran, M.
Dlużewski, P.
Kozłowski, M.

Powiązania:

https://bibliotekanauki.pl/articles/1933400.pdf

Data publikacji:

1995-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
81.35.+k

Opis:

Carbon nanotubes can be grown in the DC electric arc, they grow covered by a turbostratic graphite. The mechanism of the tubes growth is discussed. The magnetic susceptibility of samples, which contained aligned nanotubes exhibits anisotropic oscillatory behavior, which is ascribed to spatial quantization of the energy levels.

Źródło:

Acta Physica Polonica A; 1995, 87, 4-5; 885-891
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Geometrically Frustrated Kagome Lattice with Chemical Disorder

Autorzy:

Szymczak, R.
Baran, M.
Fink-Finowicki, J.
Krzymanska, B.
Aleshkevych, P.
Szymczak, H.

Powiązania:

https://bibliotekanauki.pl/articles/1813765.pdf

Data publikacji:

2008-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.30.Cr
75.20.-g

Opis:

The effect of nonmagnetic $Mg^{2+}$ and magnetic $Co^{2+}$ doping in Kagome compounds was investigated using DC magnetic susceptibility. The main effect of doping is to change the crystal field parameters. It was shown that $Co^{2+}$ doping increases considerably crystal field parameters in $Ni_3V_2O_8$ while doping with nonmagnetic $Mg^{2+}$ ions decreases considerably crystal field parameters in $Co_3V_2O_8$ crystals.

Źródło:

Acta Physica Polonica A; 2008, 113, 1; 413-416
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Financial technologies in personal financial planning: robo-advice vs. human-advice

Autorzy:

Waliszewski, Krzysztof
Warchlewska, Anna

Powiązania:

https://bibliotekanauki.pl/articles/1036945.pdf

Data publikacji:

2020-12-30

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

personal financial planning
fin-tech
robo-advice
human advice
JEL codes: D10, G20, G50, L84, O33

Opis:

The paper presents the essence of financial technologies in personal financial planning, especially robo-advice. The main aim of the paper is to describe the presumptions for the development of robo-advice. An analysis of robo-advice on personal finance management was made. The analysis was based on a review of the subject literature, and on primary and secondary research. Particular attention was paid to the intensification of activities in the implementation of modern solutions and tools supporting the management of personal finances and the gradual development of robo-advisors. Modern solutions are still struggling with great distrust on the part of their current and potential customers, and the development of modern technologies in liquidity and asset management still requires a human factor.

Źródło:

Ruch Prawniczy, Ekonomiczny i Socjologiczny; 2020, 82, 4; 303-317
0035-9629
2543-9170

Pojawia się w:

Ruch Prawniczy, Ekonomiczny i Socjologiczny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Funkcjonowanie i przyszłość G20 w erze geopolitycznych napięć początku XXI wieku

Autorzy:

Surdej, Aleksander
Mongiało, Dariusz
Chochowski, Krzysztof
Dukhnevych, Andrii

Powiązania:

https://bibliotekanauki.pl/chapters/16647982.pdf

Data publikacji:

2023

Wydawca:

Uczelnia Łazarskiego. Oficyna Wydawnicza

Tematy:

multilateralizm
globalne dobra publiczne
G20
organizacje międzynarodowe
multilateralism
global public goods
international organizations

Opis:

W artykule przedstawiono genezę, zasady funkcjonowania, metody oddziaływania oraz determinanty rozwoju Grupy Dwudziestu (G20) - specyficznej formy instytucjonalnej służącej wspólnemu definiowaniu problemów świata oraz opracowania kierunków ich rozwiązywania. W szczególności poddano analizie te mechanizmy funkcjonowania, które służą wzmocnieniu siły oddziaływania agendy i rozwiązań proponowanych przez G20 na inne państwa świata. Autorzy stworzyli i poddali również analizie scenariusze możliwych przekształceń G20 w warunkach przemian gospodarki światowej i napięć geopolitycznych.
The article presents the origins, principles of functioning, methods of influence and determinants of the development of the Group of Twenty (G20) - a specific institutional form serving the common definition of world problems and the development of directions for solving them. In particular, the mechanisms of functioning that serve to strengthen the impact of the agenda and solutions proposed by the G20 on other countries of the world were analysed. The authors also created and analyzed scenarios of possible transformations of the G20 in the conditions of changes in the global economy and geopolitical tensions.

Źródło:

Budowanie poczucia bezpieczeństwa w czasach pandemii oraz zagrożenia terroryzmem i wojną; 22-60
9788366723665

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Od Waszyngtonu do Osaki. Zagadnienie cyfryzacji w agendzie Grupy Dwudziestu
From Washington to Osaka. Digitalization in the G20 Agenda

Autorzy:

Rewizorski, Marek

Powiązania:

https://bibliotekanauki.pl/articles/32304273.pdf

Data publikacji:

2023

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

global governance
G20
digitalization
deliberation
digital economy
globalne zarządzanie
cyfryzacja
deliberacja
gospodarka cyfrowa

Opis:

Głównym celem niniejszego artykułu jest empiryczna analiza znaczenia problematyki cyfryzacji w agendzie Grupy Dwudziestu (G20). Punktem wyjścia jest oparta na ilościowej i jakościowej analizie treści dokumentów i rozmowach z ekspertami obserwacja, zgodnie z którą problematyka ta – początkowo towarzysząca zagadnieniom gospodarczym i traktowana marginalnie przez G20 – zyskała na znaczeniu podczas prezydencji w Grupie sprawowanej przez Chiny (2016) i Niemcy (2017). Emancypując się spod kurateli ekonomii cyfryzacja stała się w latach 2016–2019 priorytetem w międzypaństwowej przestrzeni deliberacyjnej i podstawą promowanej przez G20 wizji „świata połączonego”, opartego na przyjęciu szerokiego podejścia do przeobrażeń w cyberprzestrzeni i pozwalającego na powiązanie zagadnień ekonomicznych i finansowych z polityką rozwojową, bezpieczeństwem oraz ochroną praw obywatelskich.
This article’s main purpose is to empirically analyze the importance of digitalization in the agenda of the Group of Twenty (G20). The starting point is observation based on quantitative and qualitative analysis of documents and interviews with experts, according to which this issue – initially bound to the economic domain and treated marginally by the G20 – gained importance during the presidency of the Group held by China (2016) and Germany (2017). By breaking off from tutelage of economics between 2016 and 2019, digitalization became a priority in the interstate deliberation space and basis for the vision of “interconnected world” promoted by the G20, based on adopting a broad approach to transformations in cyberspace and allowing for linking of economic and financial issues with development policy, security, and protection of civil rights.

Źródło:

Przegląd Politologiczny; 2023, 1; 65-81
1426-8876

Pojawia się w:

Przegląd Politologiczny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

MnAs Nanocrystals Embedded in GaAs

Autorzy:

Kwiatkowski, A.
Wasik, D.
Kamińska, M.
Twardowski, A.
Dłużewski, P.
Borysiuk, J.
Sadowski, J.

Powiązania:

https://bibliotekanauki.pl/articles/1811951.pdf

Data publikacji:

2008-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
75.75.+a

Opis:

Magnetic properties of MnAs nanocrystals embedded in GaAs are analyzed in the frame of phenomenological model proposed by Sasaki for ferritin superparamagnets. Our calculations explain qualitatively experimental data of magnetization versus temperature, obtained according to zero-field-cooled and field-cooled protocols. They show dynamics of magnetization of MnAs nanocrystals in range of temperature from 10 K to 320 K. There is transition from state in which very slow dynamics is observed (frozen state) to state in which dynamics is fast (quasi-superparamagnetic state).

Źródło:

Acta Physica Polonica A; 2008, 114, 5; 1207-1211
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Transport and Magnetic Studies of New Mixed-Valence Compounds: K$\text{}_{3}$Cu$\text{}_{8}$Se$\text{}_{6}$, KCu$\text{}_{3}$Se$\text{}_{2}$, K$\text{}_{3}$Cu$\text{}_{8}$Te$\text{}_{6}$ and BaCuS$\text{}_{3-x}$

Autorzy:

Jacyna-Onyszkiewicz, I.
Sidowski, M.
Starodub, W.
Ratuszna, A.
Robaszkiewicz, S.

Powiązania:

https://bibliotekanauki.pl/articles/1955832.pdf

Data publikacji:

1997-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
71.30.+h

Opis:

New mixed-valent copper chalcogenides BaCuS$\text{}_{3-x}$ and K$\text{}_{3}$Cu$\text{}_{8}$X$\text{}_{6}$ with X=Se or Te and KCu$\text{}_{3}$Se$\text{}_{2}$, with chemical patterns corresponding to the recently investigated K$\text{}_{3}$Cu$\text{}_{8}$S$\text{}_{6}$ and KCu$\text{}_{3}$S$\text{}_{2}$, were synthesized. For these new samples the results of resistivity and magnetic susceptibility measurements are presented. For BaCuS$\text{}_{3-x}$, K$\text{}_{3}$Cu$\text{}_{8}$Se$\text{}_{6}$ and KCu$\text{}_{3}$Se$\text{}_{2}$ the metal-insulator transition is observed with the low temperature phase being metallic, which is untypical, whereas K$\text{}_{3}$Cu$\text{}_{8}$Te$\text{}_{6}$ is a metal in the investigated temperature range. The temperature dependence of magnetic susceptibility of the studied samples testifies to their diamagnetic or weakly paramagnetic behaviour.

Źródło:

Acta Physica Polonica A; 1997, 91, 2; 405-408
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Low-Temperature Structural Phase Transition in Monoclinic RbDy(WO$\text{}_{4}$)$\text{}_{2}$ Crystal

Autorzy:

Borowiec, M. T.
Dyakonov, V.
Kamenev, V.
Nabiałek, A.
Prokhorov, A.
Szymczak, H.
Załęski, M.

Powiązania:

https://bibliotekanauki.pl/articles/1968975.pdf

Data publikacji:

1998-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.30.-v
75.20.-g

Opis:

The ESR spectrum of Dy$\text{}^{3+}$ ion in the low-symmetry RbDy(WO$\text{}_{4}$)$\text{}_{2}$ crystal has been studied in the temperature region of T=4.2 ÷ 30K. The ESR linewidth was found to increase from 130 mT up to the maximum value of 190 mT at T=9K and then to decrease down to 150 mT at 4.2K. The components of the g-tensor change considerably without change of their spatial orientation in the temperature range from 12K to 7 K: g$\text{}_{z}$=2.5, g$\text{}_{x}$≈0, g$\text{}_{y}$=1.41 at T>12 K; g$\text{}_{z}$=1.53, g$\text{}_{x}$≈0, g$\text{}_{y}$=1.2 at T<7K. The observed λ-shaped behaviour of absorption linewidth and the decrease in the g-factor are assumed to be due to the low-temperature structural phase transition (T$\text{}_{SPT}$≈9 K). The width of the transition area is of about 5K. It is suggested that the symmetry of high- and low-temperature phases is identical.

Źródło:

Acta Physica Polonica A; 1998, 94, 1; 71-77
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

The Persistence of Suicides in G20 Countries between 1990 and 2017: an SPSM Approach to Three Generations of Unit Root Tests
Utrzymywanie się samobójstw w krajach G20 w latach 1990–2017: podejście SPSM do trzech generacji testów pierwiastka jednostkowego

Autorzy:

Anyikwa, Izunna
Hamman, Nicolene
Phiri, Andrew

Powiązania:

https://bibliotekanauki.pl/articles/1812124.pdf

Data publikacji:

2021-06-30

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

samobójstwa
metoda SPSM
nieliniowe testy pierwiastka jednostkowego
testy pierwiastka jednostkowego w postaci Fouriera
państwa G20
Suicides
sequential panel selection method (SPSM)
nonlinear unit root tests
Fourier form unit root tests
G20 countries

Opis:

Suicides represent an encompassing measure of psychological wellbeing, emotional stability as well as life satisfaction, and they have been recently identified by the World Health Organization (WHO) as a major global health concern. The G20 countries represent the powerhouse of global economic governance and hence possess the ability to influence the direction of global suicide rates. In applying the sequential panel selection method (SPSM) to three generations of unit root testing procedures, the study investigates the integration properties of suicides in G20 countries between 1990–2017. The results obtained from all three generations of tests provide rigid evidence of persistence within the suicides for most member states of the G20 countries, hence supporting the current strategic agenda pushed by the WHO in reducing suicides to a target rate of 10 percent. In addition, we further propose that such strategies should emanate from within G20 countries and spread globally thereafter.
Samobójstwa stanowią wszechstronną miarę dobrego samopoczucia psychicznego, stabilności emocjonalnej, a także satysfakcji z życia, a ostatnio zostały uznane przez Światową Organizację Zdrowia (WHO) za główny problem zdrowotny na świecie. Państwa G20 są potęgą w obszarze globalnego zarządzania polityką gospodarczą, a tym samym mają zdolność wpływania na kształtowanie się globalnego wskaźnika samobójstw. Stosując metodę SPSM do trzech generacji testów pierwiastka jednostkowego, w opracowaniu zbadano własności integracyjne samobójstw w krajach G20 w latach 1990–2017. Wyniki uzyskane ze wszystkich trzech generacji testów dostarczają mocnych dowodów na utrzymywanie się samobójstw w większości państw członkowskich G20. Uzasadnia to istnienie aktualnego programu strategicznego forsowanego przez WHO, zmierzającego do redukcji odsetka samobójstw do docelowego poziomu 10 procent. Wskazano ponadto, że takie strategie powinny rozprzestrzeniać się z państw G20 na pozostałe państwa świata.

Źródło:

Comparative Economic Research. Central and Eastern Europe; 2021, 24, 2; 153-173
1508-2008
2082-6737

Pojawia się w:

Comparative Economic Research. Central and Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Simple Method for Calculating the Weak-Field Electron Diamagnetism in Cubic Lattices

Autorzy:

Olszewski, S.

Powiązania:

https://bibliotekanauki.pl/articles/2030424.pdf

Data publikacji:

2002-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
75.20.En
76.40.+b

Opis:

The idea of electron wave packets moving along closed anisotropic Fermi surfaces placed in a constant magnetic field has been applied to the calculation of the orbital magnetic moment of an individual free electron and tightly-bound s-electron in a crystal lattice. In each case the magnetic moment is obtained as a derivative of the electron energy done with respect to the strength of the magnetic field. In the next step, calculations have been extended to electron ensembles. For a free-electron ensemble a thorough calculation of the weak-field magnetic moment gives a result similar to that obtained by a well-known method developed by Landau. On the other hand, calculations done for the s-band of the tightly-bound electrons of metallic iron give an absolute value of the magnetic moment much smaller than in the free-electron case. Simultaneously, the sign of the moment is changed indicating a lowering of the iron band electron energy with magnetization.

Źródło:

Acta Physica Polonica A; 2002, 101, 2; 249-265
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Electrical Transport Properties of $Yb_{8-x}Y_xV_2O_{17}$ (x=0,2,8)

Autorzy:

Sawicki, B.
Piz, M.
Filipek, E.
Groń, T.
Duda, H.

Powiązania:

https://bibliotekanauki.pl/articles/1398346.pdf

Data publikacji:

2017-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.20.Pa
72.80.Ga
75.20.-g

Opis:

The UV-vis-NIR and electrical properties of $Yb_{8-x}Y_xV_2O_{17}$ for x=0, 2, and 8 were investigated. The band energy gap of 2.6 eV determined for $Yb_6Y_2V_2O_{17}$ (x=2) and comparable for the remaining compounds with x=0 and 8 is characteristic for insulators. Low electrical conductivity with a characteristic minimum shifting to higher temperatures from 322, via 360 to 370 K in the sequence x=0, 2 and 8, which decreases with increasing content of ytterbium was observed. Temperature dependence of thermoelectric power showed n-p transition at 410 and 467 K for x=0 and 2, respectively, and n-type conductivity for x=8, indicating mainly n-type electrical conductivity. A breakdown voltage of 26 V/mm is mainly observed for the I-V characteristics at 400 K and showing a varistor-like behavior.

Źródło:

Acta Physica Polonica A; 2017, 132, 2; 363-366
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Influence of Cr-Substitution on the Electrical Properties of $Fe_{1-x}Cr_xVSbO_6$

Autorzy:

Duda, H.
Filipek, E.
Dąbrowska, G.
Groń, T.
Mydlarz, T.

Powiązania:

https://bibliotekanauki.pl/articles/1399099.pdf

Data publikacji:

2013-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.20.Pa
72.80.Ga
75.20.-g

Opis:

$Fe_{1-x}Cr_xVSbO_6$ solid solution is semiconductor with the activation energy decreasing both in the intrinsic and extrinsic conductivity temperature regions as the Cr-content increases. The n-type conduction is observed for Fe-richer samples while a change of the Seebeck coefficient (from n to p) - for Cr-richer ones. Magnetic isotherms for all samples of solid solution under study are characteristic of the universal Brillouin function, indicating paramagnetic response. These effects are discussed within the framework of the appearance of the mixed valence of both Fe and Cr ions.

Źródło:

Acta Physica Polonica A; 2013, 124, 5; 833-835
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Influence of Cr-Substitution on the Electrical Properties of $Fe_{1-x}Cr_{x}SnSbO_6$

Autorzy:

Groń, T.
Dąbrowska, G.
Filipek, E.
Duda, H.
Sawicki, B.

Powiązania:

https://bibliotekanauki.pl/articles/1398554.pdf

Data publikacji:

2016-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.20.Pa
72.80.Ga
75.20.-g

Opis:

$Fe_{1-x}Cr_xSnSbO_6$ solid solution shows semiconducting behaviour with the activation energy decreasing from $E_{A}$=0.64 eV for x=0.0 to $E_{A}$=0.32 eV for x=1.0 in the intrinsic conductivity temperature region as well as the n-type conduction at room temperature. The I-V characteristics and the conductance G at 300 and 400 K showed symmetrical and nonlinear behavior in the voltage range (-100, 100 V) suggesting the electron emission over the potential barrier especially for the boundary compounds FeSnSbO₆ and CrSnSbO₆. These effects are discussed in the context of the energy gap $E_{g}$>1.6 eV many times greater than the thermal energy kT.

Źródło:

Acta Physica Polonica A; 2016, 129, 1a; A-153-A-156
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Electrical Properties of Sr₂InV₃O₁₁

Autorzy:

Groń, T.
Filipek, E.
Pacześna, A.
Urbanowicz, P.
Sawicki, B.
Duda, H.

Powiązania:

https://bibliotekanauki.pl/articles/1398582.pdf

Data publikacji:

2016-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.20.Pa
72.80.Ga
75.20.-g

Opis:

The electrical conductivity σ (T) and thermoelectric power S(T) measurements of Sr₂InV₃O₁₁ showed the insulating state and the change of sign of thermopower from p to n at $T_{n-p}$=400 K. The I-V characteristics provided the evidence of symmetrical and non-linear behaviour typical of strong emission of charge carriers induced by temperature and voltage. Relative dielectric permittivity $ε_{r}$ as well as loss tangent (tan δ) strongly depend both on the temperature in the range of 295-400 K and the frequency in the range of 5×10² to 1×10⁶ Hz, showing the broad maximum at 320 K. These effects are considered as a relaxation process like in the Maxwell-Wagner or Jonscher model as well as the conduction of electric current, as determined by the Joule-Lenz law.

Źródło:

Acta Physica Polonica A; 2016, 130, 5; 1239-1241
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Diluted Magnetic Semimetals - Beyond Heisenberg Coupling

Autorzy:

Wilamowski, Z.
Story, T.
Jantsch, W.

Powiązania:

https://bibliotekanauki.pl/articles/1931949.pdf

Data publikacji:

1995-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
75.30.Hx
76.20.+q

Opis:

We analyse effects which cannot be explained assuming the isotropic Heisenberg form of sp-d or of the indirect d-sp-d (RKKY) coupling. Resonance line broadening, a line shift and an enhancement of the magnetic anisotropy in diluted magnetic semimetals are discussed.

Źródło:

Acta Physica Polonica A; 1995, 87, 1; 189-192
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Paramagnetism of Cu_3RE_2W_4O_{18} Semiconductors (RE = Gd, Dy-Er)

Autorzy:

Groń, T.
Tomaszewicz, E.
Duda, H.
Mazur, S.

Powiązania:

https://bibliotekanauki.pl/articles/1399149.pdf

Data publikacji:

2013-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp
75.20.-g
75.30.Cr

Opis:

$Cu_3RE_2W_4O_{18}$ tungstates (RE = Gd, Dy-Er) are paramagnets in the temperature range 4.2-300 K visible also in the absence of the energy losses in the curve of the imaginary part of magnetic susceptibility, χ". The negative values of the paramagnetic Curie-Weiss temperature, θ, may suggest the weak antiferromagnetic coupling below 4.2 K. The temperature independent component of magnetic susceptibility has a positive value indicating a domination of the Van Vleck contribution. Calculations of the effective number of the Bohr magnetons revealed that the orbital contribution to the magnetic moment comes mainly from the $RE^{3+}$ ions.

Źródło:

Acta Physica Polonica A; 2013, 124, 5; 885-887
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Phononic Band Gap Width Control through Structural and Material Parameters in Two-Dimensional Phononic Crystals

Autorzy:

Śliwa, I.
Krawczyk, M.

Powiązania:

https://bibliotekanauki.pl/articles/2044562.pdf

Data publikacji:

2005-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

43.20.+g
43.35.+d
43.40.+s

Opis:

The phononic band structures of two-dimensional solid phononic crystals with different lattice and scatterer symmetry are studied numerically, with three types of lattice (square, triangular, and rectangular) and four different scatterer shapes (circle, hexagon, square, and rectangle) considered. XY and Z vibration modes are investigated separately. Two types of phononic crystal are considered: one composed of high-density rods embedded in a low-density matrix, the other of low-density rods in a high-density matrix. In the former case, lattice type and polarization being fixed, the broadest gaps are obtained when the symmetry of the rods corresponds to that of the lattice (the shape of a rod is identical with that of the first Brillouin zone); the largest gap width values are observed in triangular lattice-based crystals (compared to those based on the square and rectangular lattices), the shape of the corresponding first Brillouin zone being closest to a circle. These rules do not apply to structures in which the density of the rod material is lower than that of the matrix. In this case, when the symmetry of the rods corresponds to that of the lattice, gaps either fail to appear at all, or are much narrower than in other configurations. The effect of other material parameter values (such as the longitudinal and transversal velocity values) on the relation between the energy gap width and the scatterer symmetry is found to be much lesser.

Źródło:

Acta Physica Polonica A; 2005, 108, 6; 943-957
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Magnetism in $NdMnO_{3+δ}$ Studied by the Single Crystal Neutron Diffraction

Autorzy:

Mihalik, M.
Maťaš, S.
Vavra, M.

Powiązania:

https://bibliotekanauki.pl/articles/1368766.pdf

Data publikacji:

2014-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
75.30.-m
75.50.Gg

Opis:

We present the single crystal neutron diffraction experiment performed on the $NdMnO_{3+δ}$ compound. The aim of the experiment was to study/revisit the magnetic structure of the compound. We have confirmed the ordering of Mn sublattice below $T_{N}$=85.5 K and confirmed that the Nd sublattice orders below $T_{1}$ ≈ 20 K with Nd moments aligned parallel to the b-axis.

Źródło:

Acta Physica Polonica A; 2014, 126, 1; 284-285
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Nuclear Data Evaluation for ²¹⁷Th

Autorzy:

Nafee, S.
Al-Ramady, A.
Shaheen, S.

Powiązania:

https://bibliotekanauki.pl/articles/1398746.pdf

Data publikacji:

2016-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

21.10.-k
23.20.-g
23.35.+g
29.30.-h

Opis:

Thorium-217 was produced by the reaction ¹⁷⁰Er (⁵⁰Ti, xn) ^{220-x}Th. The nuclei were studied by Evaporation Residues gamma-alpha-gamma coincidence measurements (ER-γ-α-γ). The evaluated decay data for the ²¹⁷Th nuclide resulted from the above interaction is presented in this report. Three delayed γ-transitions (309, 673 and 1269 keV) have been measured from the ER-γ(-γ)-α correlations and γ-γ coincidences. They were assigned to ²¹⁷Th, based on the level systematics of the N=127 isotones. The evaluated half-lives T_{1/2} for these levels were assigned to be 64-₂₂⁺⁶⁴, 69-₁₇⁺³² and 66-₁₅⁺²⁷ μs, respectively. In addition, an isomeric state (2252+x) keV is presented in the ²¹⁷Th decay scheme between the 2252 (21/2+) and 2362 (25/2+) keV. Q (α) has been updated based on the recent published work of the Atomic Mass Evaluation AME2012 as well. Moreover, the total conversion electrons as well as the K-Shell to L-Shell, L-Shell to M-Shell and L-Shell to N-Shell conversion electron ratios have been calculated using BrIcc code v2.3.

Źródło:

Acta Physica Polonica A; 2016, 129, 4; 669-672
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Experimental Study of Magnetic Properties of Alumina Ceramics

Autorzy:

Tarasenko, R.
Orendáčová, A.
Orendáč, M.
Kajňaková, M.
Feher, A.

Powiązania:

https://bibliotekanauki.pl/articles/1535536.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
75.60.Ej
75.40.-s

Opis:

Magnetic properties of alumina ceramics were studied within a program focused at design of microcalorimeters and experimental setup for specific heat and magnetocaloric measurements. The investigations were concentrated on the determination of amount of magnetic impurities that can significantly influence results of physical measurements at low temperatures. Our experimental studies of heat capacity, susceptibility and magnetization clearly indicate that alumina ceramics contains magnetic impurities, primarily ions with spin 5/2. The average concentration of magnetic ions was estimated, n ≈ 2000 ppm. More details of analysis of experimental data are discussed in the paper.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 1067-1068
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

In the Search of Electron Correlation Effects in DNA

Autorzy:

Wróbel, A.
Wróbel, P.

Powiązania:

https://bibliotekanauki.pl/articles/1537235.pdf

Data publikacji:

2010-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

87.14.gk
75.20.-g
71.10.Fd

Opis:

We discuss the energy scale separation induced in DNA by gaps between molecular orbital states of individual bases and by electron correlations. We also demonstrate how this separation gives rise to effective low energy models of electron transport in DNA.

Źródło:

Acta Physica Polonica A; 2010, 118, 2; 409-412
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Rola wiskosuplementacji w profilaktyce i leczeniu choroby zwyrodnieniowej stawu kolanowego - przegląd danych dotyczących hylanu G-F 20
The role of viscosupplementation in prevention and treatment of knee osteoarthritis - review of data concerning hylan G-F 20

Autorzy:

Szelerski, Ł.
Ambroziak, M.
Skowronek, P.
Małdyk, P.

Powiązania:

https://bibliotekanauki.pl/articles/286022.pdf

Data publikacji:

2014

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

wiskosuplementacja
hylan G-F 20
gonartroza
kwas hialuronowy
viscosupplementation
gonarthrosis
hyaluronic acid

Opis:

Wiskosuplementacja jest jedną z metod nieoperacyjnego leczenia choroby zwyrodnieniowej stawu kolanowego. Polega na uzupełnianiu ilości endogennego kwasu hialuronowego w stawie za pomocą jednej lub kilku iniekcji. Zmniejsza dolegliwości bólowe pacjenta i poprawia zakres ruchomości stawu. Autorzy przeanalizowali literaturę dotyczącą badań nad wynikami stosowania wiskosuplementacji u pacjentów z gonartrozą i podjęli próbę uporządkowania wiedzy dotyczących jego stosowania. Ocenie poddano prace porównawcze działania kwasu hialuronowego vs placebo, analizy dotyczące wpływu budowy cząsteczki preparatu na efekt leczniczy, a także porównania z iniekcjami kortykosteroidowymi. Iniekcje dostawowe kwasu hialuronowego są efektywną i bezpieczną metodą w profilaktyce i leczeniu choroby zwyrodnieniowej stawu kolanowego. Zmniejszają dolegliwości bólowe oraz poprawiają funkcję ruchową u pacjentów. Notuje się niewielki odsetek działań niepożądanych po podaniu. Działanie kwasu hialuronowego nie ogranicza jedynie subiektywnych odczuć chorego. Istnieją opracowania, które wskazują na zmniejszenie degradacji chrząstki stawowej w badaniu MRI, u pacjentów stosujących wiskosuplementację. Wykazano przewagę kwasu hialuronowego nad iniekcjami kortykosteroidowymi, które chociaż dają szybszy efekt przeciwbólowy, działają krócej i stanowią czynnik uszkadzający chrząstkę stawową. Pozwalają odroczyć alloplastykę stawu kolanowego u pacjentów z zaawansowaną gonartrozą (Kellgren-Lawrence IV), a w grupie chorych poddanych artroskopii stawu kolanowego, skracają okres rekonwalescencji. Wiskouplementacja jest efektywną i bezpieczną metodą leczenia objawowej gonartrozy i stanowi uzupełnienie lub alternatywę dla stosowania innych technik terapii zachowawczej.
Viscosupplementation is one of the nonsurgical methods of treating the knee osteoarthritis. In this procedure the amount of endogenous hyaluronic acid is supplemented by means of one or several joint injections. Such a treatment relieves pain and improves the range of the joint motion. The authors analyzed the research literature concerning viscosupplemetation in patients with gonarthrosis and attempted to organize the knowledge concerning the hyaluronic acid application. The following papers were taken into consideration: comparative studies of hyaluronic acid versus placebo efficacy, analyses of the structure of the HA and its overall effectiveness, and comparison studies of hyaluronic acid vs. corticosteroid injections. Hyaluronic acid joint injections are an effective and safe method in protection and treatment of knee osteoarthritis. They relieve pain and improve the range of joint motion. There have been only few side effects noted. The application of hyaluronic acid provides subjective positive feelings in patients, yet there are also studies proving that viscosupplementation leads to the decrease of cartilage degradation, as shown in MRI tests. There is a clear advantage of hyaluronic acid over corticosteroid injections – even though the latter relieve pain faster, they act for a shorter period of time and they damage the cartilage in due course. Hyaluronic acid injections postpone the necessity of knee alloplastic reconstruction in patients with advanced gonarthrosis, and in patients who underwent knee arthroscopy the recovery time is shortened. Viscosupplementation is an effective and safe treatment for gonarthrosis. It may be either a complementation or an alternative to other noninvasive techniques.

Źródło:

Engineering of Biomaterials; 2014, 17, 127; 2-6
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Influence of Rare Earth Metals on Microstructure and Mechanical Properties of G20Mn5 Cast Steel

Autorzy:

Kasińska, J.

Powiązania:

https://bibliotekanauki.pl/articles/379581.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

G20Mn5
rare earth metals
modification
microstructure
impact toughness
metale ziem rzadkich
modyfikacja
mikrostruktura
odporność na uderzenia

Opis:

The paper describes influence of rare earth metals (REMs) on G20Mn5 cast steel microstructure and mechanical properties. The cerium mixture of the following composition was used to modify cast steel: 49.8% Ce, 21.8% La, 17.1% Nd, 5,5% Pr and 5.35% of REMs. Cast steel was melted in industrial conditions. Two melts of non-modified and modified cast steel were made. Test ingots were subject to heat treatment by hardening (920°C/water) and tempering (720°C/air). Heat treatment processes were also performed in industrial conditions. After cutting flashes off samples of cast steel were collected with purpose to analyze chemical composition, a tensile test and impact toughness tests were conducted and microstructure was subject to observations. Modification with use of mischmetal did not cause significant changes in cast steel tensile strength and yield strength, while higher values were detected for fractures in the Charpy impact test, as they were twice as high as values for the data included in the PN-EN 10213:2008 standard. Observations performed by means of light and scanning microscopy proved occurrence of significant differences in grain dimensions and morphology of non-metallic inclusions. Adding REMs resulted in grain fragmentation and transformed inclusion shapes to rounded ones. Chemical composition analyses indicated that round inclusions in modified cast steel were generally oxysulphides containing cerium and lanthanum. In the paper the author proved positive influence of modification on G20Mn5 cast steel mechanical properties.

Źródło:

Archives of Foundry Engineering; 2018, 18, 3; 37-42
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Racah Recoupling Matrices for System of Two Free Electrons Confined To Single Star

Autorzy:

Lulek, T.
Kłos, J.

Powiązania:

https://bibliotekanauki.pl/articles/1945688.pdf

Data publikacji:

1996-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.20.-a
31.10.+z
75.10.Lp
75.20.-g

Opis:

Racah-Wigner type of calculus is adapted to the system of two free electrons in a cubic box, confined to a single star p00 of quasimomentum. Various coupling schemes (LS-like, jj-like, and transitive) have been reviewed in analogy to the case of a free atom. Racah recoupling matrices are calculated explicitly, and their quantum-mechanical meaning is exposed in terms of octahedral multipoles.

Źródło:

Acta Physica Polonica A; 1996, 90, 3; 483-490
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Preparation and Characterization of Nano Ferrites

Autorzy:

Lazarević, Z.
Jovalekić, Č.
Milutinović, A.
Romčević, M.
Romčević, N.

Powiązania:

https://bibliotekanauki.pl/articles/1489907.pdf

Data publikacji:

2012-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
81.07.Wx
81.20.Ev
74.25.nd

Opis:

Nickel ferrite $(NiFe_2O_4)$ and manganese ferrite $(MnFe_2O_4)$ have been prepared by a soft mechanochemical route from mixture of (1) $Ni(OH)_2$ and $α-Fe_2O_3$ and (2) $Mn(OH)_2$ and $α-Fe_2O_3$ powders in a planetary ball mill. The mixture was activated for varying duration. Soft mechanochemical reaction leading to formation of the $NiFe_2O_4$ and $MnFe_2O_4$ spinel phases were followed by X-ray diffraction, Raman and infrared spectroscopy, scanning and transmission microscopy. The spinel phase formation was first observed after 4 h of milling (case 1) and after 3 h (case 2) and its formation was completed after 25 h in both cases. The synthesized $NiFe_2O_4$ and $MnFe_2O_4$ ferrites have a nanocrystalline structure with a crystallite size of about 30 and 40 nm for cases (1) and (2), respectively. There are five Raman and four IR active modes. In order to understand better the whole process of phase formation, the Mössbauer measurements were done.

Źródło:

Acta Physica Polonica A; 2012, 121, 3; 682-686
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

New Results on the Density of Electronic States, Superexchange Interaction, and Electrical Conduction in Transition-Metal Salts

Autorzy:

Grado-Caffaro, M.

Powiązania:

https://bibliotekanauki.pl/articles/1401901.pdf

Data publikacji:

2015-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
75.20.En
75.50.-y
75.76.+j

Opis:

We investigate several issues related to the electronic states in the ligand orbital of a given transition-metal salt as, for example, a K₂CuCl₄·2H₂O-type compound. In fact, to get our calculation, we start from an expression for the electronic density of states in a compound of the above type. In addition, various aspects related to superexchange interaction in both the paramagnetic and ferromagnetic cases are discussed and the electronic conduction process in the ligand orbital is studied.

Źródło:

Acta Physica Polonica A; 2015, 128, 3; 394-397
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Wigner-Racah Description of the Free-Electron Model

Autorzy:

Lulek, T.

Powiązania:

https://bibliotekanauki.pl/articles/1891909.pdf

Data publikacji:

1991-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.20.+b
71.45.-d
75.10.Lp
75.20.-g

Opis:

A version of Wigner-Racah type of approach is proposed for the model of a free-electron gas in a cubic box. The approach bases on the structure of fibre bundle in description of states of a single electron. Contrary to the tight binding model, the base of the bundle is the reciprocal space rather than the positional one. An elementary quantity of the approach is the star of quasi-momentum. Such a treatment reveals the degeneracy of energy levels of the system of N electrons, in particular of the ground Fermi level, for an uncomplete filling of stars. The associated classification of energy levels and corresponding states can be performed within an atomic-like Wigner-Racah scheme.

Źródło:

Acta Physica Polonica A; 1991, 80, 6; 769-779
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Coupled States of the System of Two Free Electrons on a Single Star

Autorzy:

Walcerz, S.
Lulek, T.

Powiązania:

https://bibliotekanauki.pl/articles/1891910.pdf

Data publikacji:

1991-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.20.+b
71.45.-d
75.10.Lp
75.20.-g

Opis:

A classification scheme of quantum states for the system of two free electrons in a cubic box, confined to a single star of quasi-momentum is proposed within a Racah-Wigner type of approach. Coupling of angular momenta of the atomic case is here substituted by Mackey theorem for transitive representations, which provides a crystalline analogue of orbital angular momentum - the resultant orbit of the geometric symmetry group. The action of the Pauli group is combined with that of the octahedral group which yields the connection between spin (i.e. the singlet or triplet pairing of electrons) and statistic of the positional factor. Resultant singlets and doublets - irreducible representations of the octahedral group, exhibit an ordinary Landau diamagnetic behaviour, whereas triplets are paramagnetic. A relation between the Mackey star and the star of resultant momentum is discussed.

Źródło:

Acta Physica Polonica A; 1991, 80, 6; 781-792
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Curie Temperature and Density of States at the Fermi Level for Al-Cu-Fe Phases: β-Solid State Solution-Approximants-Icosahedral Quasicrystals

Autorzy:

Shalaeva, E.
Prekul, A.
Shchegolikhina, N.
Medvedeva, N.

Powiązania:

https://bibliotekanauki.pl/articles/1373475.pdf

Data publikacji:

2014-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
71.23.Ft
71.20.-b
61.66.Dk

Opis:

A consistent reduction in the absolute value of the negative paramagnetic Curie temperature was found in a series of Al-Cu-Fe phases: β(CsCl)-solid state solution, noncanonical approximant (η-AlCu(Fe) phase), rational approximants (P1+P2-pentagonal phases) and icosahedral quasicrystal. For these Al-Cu-Fe phases, the decrease in the Curie temperature correlates with a reduction of the density of states at the Fermi level which was estimated from the low-temperature heat capacity measurements and first-principles calculations. The observed correlation was related to the antiferromagnetic indirect exchange interaction (Ruderman-Kittel-Kasuya-Yosida interaction) between the localized magnetic moments on Fe induced by the intrinsic structural defects in the Al-Cu-Fe phases. The weakening of Fe 3d-Al s, p hybridization owing to the intrinsic structural defects such as vacancies, antisite defects and distortions of coordination polyhedrons is suggested to be the main mechanism of appearance of localized magnetic moments on Fe atoms.

Źródło:

Acta Physica Polonica A; 2014, 126, 2; 572-576
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Aspects of Magnetism in Heavy-Electron Metals

Autorzy:

Ott, H. R.

Powiązania:

https://bibliotekanauki.pl/articles/1860764.pdf

Data publikacji:

1994-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
75.20.Hr
75.30.-m
75.30.Mb

Opis:

For some time it was believed that heavy-mass electrons at low temperatures, in special rare-earth and actinide compounds, were due to a particular suppression of magnetic order in these materials. Various experiments reveal, however, that magnetic order may occur from a heavy-electron state and that also a heavy-electron state may develop in the presence of a magnetically-ordered matrix. Even in materials with no sign of a cooperative phase transition, microscopic experimental probes give evidence for strong magnetic correlations, involving only very tiny (< 10^{-1} μ_{B}) ordered moments, however. All these experimental observations indicate that the heavy-electron state cannot always be regarded as a simple Fermi liquid in the usual sense. Various interactions of similar strength need to be considered. It is suggested that the balance of these interactions may lead to electronic inhomogeneities in k space. Both in magnetically-ordered or superconducting systems, unexpected electronic degrees of freedom appear to exist. In other cases experimental observations suggest magnetic inhomogeneities in real space which are not simply due to chemical inhomogeneities. Different examples of these various possibilities are demonstrated and discussed.

Źródło:

Acta Physica Polonica A; 1994, 85, 1; 7-19
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Effect of Manganese on Magnetic and Electrical Properties of the RMn$\text{}_{x}$T$\text{}_{12-x}$ Alloys

Autorzy:

Suski, W.
Wochowski, K.
Mydlarz, T.
Belan, B.

Powiązania:

https://bibliotekanauki.pl/articles/2014385.pdf

Data publikacji:

2000-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Gg
75.20.-g
75.20.En
75.50.Ee

Opis:

The magnetic and electrical properties of the tetragonal, ThMn$\text{}_{12}$-type RMn$\text{}_{x}$T$\text{}_{12-x}$ alloys (R = Y, Ce, Pr, Nd, Sm and T = Fe, Co, Ni) were studied in broad temperature and magnetic field ranges to elucidate an influence of manganese on the magnetic ordering in these materials. Magnetic properties were examined at T=1.7-300K in magnetic field up to 14T, whereas the electrical properties were examined at T=4.2-300K, on the polycrystalline samples. Majority of the samples exhibit ferro- or ferrimagnetic properties. Some samples containing larger concentration of Mn are paramagnetic in the whole temperature range. The electrical resistivity of these alloys shows metallic character.

Źródło:

Acta Physica Polonica A; 2000, 98, 5; 505-511
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Adaptive Modulation Amplitude in 2D Spectral-Spatial EPR Imaging

Autorzy:

Czechowski, T.
Samolej, A.
Baranowski, M.
Boś-Liedke, A.
Chlewicki, W.
Jurga, J.
Tadyszak, K.

Powiązania:

https://bibliotekanauki.pl/articles/1030422.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.30.-v
42.30.Wb
75.20.-g
42.30.Va

Opis:

A study concerning the image quality in Electron Paramagnetic Resonance Imaging (EPRI) in 2D spectral-spatial (2D SSI) experiments is presented. The aim of the measurements is to improve the signal to noise ratio (SNR) of the projections by applying a more consciously selected modulation amplitude parameter. Data is gathered by applying three constant and one adaptive modulation amplitude. The three fixed modulation amplitudes values are leading to undermodulated (0.01 G), partially overmodulated (0.15 G) and fully overmodulated (0.65 G) projections. The study demonstrates the advantages of the adaptive method, which involves selecting different and dependent on cosine function modulation amplitudes for each projection. The study is performed on a phantom containing four tubes of LiPc and TCNQ, characterized by a different peak to peak linewidth and spin concentration.

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 710-712
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

The Synthesis and Properties of High Surface Area $Fe_{2}O_{3}$ Materials

Autorzy:

Surowiec, Z.
Gac, W.
Wiertel, M.

Powiązania:

https://bibliotekanauki.pl/articles/1506442.pdf

Data publikacji:

2011-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.80.+y
78.67.Bf
78.67.Rb
75.20.-g

Opis:

Two types of the silica materials were used for the preparation of iron oxides. The MCM-48 type silica support and wide-pore silica gel were impregnated with iron nitrates. The samples were investigated by the nitrogen adsorption/desorption method, X-ray diffraction, scanning electron microscopy, and $\text{}^{57}Fe$ Mössbauer spectroscopy. Redox properties were studied by the temperature programmed reduction method. Strongly dispersed hematite was evidenced on the supports. An application of the MCM-48 silica mesoporous materials led to the development of the oxide phases within the ordered porous structure. The detailed temperature programmed reduction studies evidenced slight differences of the redox properties of the species located within the silica templates and after their removal. Magnetic properties of iron oxides were related to the porous structure of the silica supports. The Mössbauer study of high surface area materials Fe/$SiO_{2}$ and Fe/MCM-48 type silicate templates revealed existence of ferro- and superparamagnetic phases. The relative contribution of the superparamagnetic doublet component in Mössbauer spectra is 15% and 80% for Fe/$SiO_{2}$/c and Fe/MCM-48/c samples, respectively.

Źródło:

Acta Physica Polonica A; 2011, 119, 1; 18-20
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Superparamagnetic-Like Behaviour in RE$\text{}_{2}$WO$\text{}_{6}$ Tungstates (Where RE = Nd, Sm, Eu, Gd, Dy, Ho and Er)

Autorzy:

Groń, T.
Tomaszewicz, E.
Urbanowicz, P.
Duda, H.
Mydlarz, T.

Powiązania:

https://bibliotekanauki.pl/articles/2048133.pdf

Data publikacji:

2011-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
75.25.Dk
75.30.Cr
73.61.Ng

Opis:

The magnetization isotherms were used to study the superparamagnetic-like behaviour in polycrystalline (powder) RE$\text{}_{2}$WO$\text{}_{6}$ tungstates (where RE = Nd, Sm, Eu, Gd, Dy, Ho and Er). The magnetization isotherms of the majority tungstates under study revealed both the spontaneous magnetic moments and hysteresis characteristic for the superparamagnetic-like behaviour with blocking temperature T$\text{}_{B}$ ≈ 30 K except the Sm$\text{}_{2}$WO$\text{}_{6}$ and Eu$\text{}_{2}$WO$\text{}_{6}$ compounds.

Źródło:

Acta Physica Polonica A; 2011, 119, 5; 708-710
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

The Influence of Reduction Process on the Iron-Molybdenum Nanoparticles in Modified MCM-41 Silica

Autorzy:

Surowiec, Z.
Wiertel, M.
Gac, W.
Budzyński, M.

Powiązania:

https://bibliotekanauki.pl/articles/1381974.pdf

Data publikacji:

2014-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.80.+y
78.67.Bf
78.67.Rb
75.20.-g

Opis:

Iron-molybdenum silica mesoporous materials were obtained by the application of direct hydrothermal method. The influence of high temperature samples reduction in the $H_2$ flow on their structural and magnetic properties was studied. Four samples with different metal contents relative to silica were investigated. The study was carried out by means of X-ray diffraction, $\text{}^{57}Fe$ Mössbauer spectroscopy and the temperature programmed reduction method. With an increasing metals content, primary pores of MCM-41 transformed into the bottle-like pores, and then into the slit-like ones. Reduction and heat treatment caused the α-Fe, $Fe_2Mo$, and Fe-Mo alloy formation. Iron and molybdenum atoms after being released into the silica matrix, where they were embedded, create clusters or crystallites. It was observed that the high temperature reduction caused partial transformation of highly dispersed Fe-Mo oxides species initially embedded in silica walls into crystallites big enough to give magnetic sextet component in the Mössbauer spectra.

Źródło:

Acta Physica Polonica A; 2014, 125, 3; 846-849
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Magnetic Study of the Fe Coated by Au Nanoparticles

Autorzy:

Zeleňáková, A.
Kováč, J.
Kavečanský, V.
Zeleňák, V.

Powiązania:

https://bibliotekanauki.pl/articles/1813874.pdf

Data publikacji:

2008-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.46.Df
68.37.Lp
75.20.-g
75.30.Cr

Opis:

Nanosized iron-gold magnetic nanoparticles with an average particle size 10 nm were prepared by a reverse micelle method. The magnetic properties measurements of DC and AC magnetization confirm behaviour typical of a superparamagnetic system, such as the irreversibility of the zero-field-cooled and field-cooled curves, the frequency dependence of a blocking temperature $T_B$, and revealing of coercivity H_C below blocking temperature. The quantitative analysis of AC susceptibility due to value of parameter $C_1$ = Δ$T_B$/($T_B$ Δ log f)=0.0242 confirming the existence of inter-particle interaction in our system.

Źródło:

Acta Physica Polonica A; 2008, 113, 1; 533-536
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Exchange Bias in Iron-Oxide Particles Nanocasted in Periodic Porous Silica

Autorzy:

Zeleňáková, A.
Kováč, J.
Zeleňák, V.

Powiązania:

https://bibliotekanauki.pl/articles/1810584.pdf

Data publikacji:

2009-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.46.Df
68.37.Lp
75.20.-g
75.30.Cr

Opis:

Iron-oxide nanoparticles were nanocasted in the periodic mesoporous silica matrix, consisting of two-dimensional hexagonally ordered channel system with the mean diameter of the channels about 7 nm. The magnetic measurements of dc magnetization confirm behavior typical of a superparamagnetic system, such as the irreversibility of the zero-field-cooled and field-cooled curves, presence of a maximum in zero-field-cooled curve related with blocking temperature $T_C$ and revealing of coercivity $H_C$ below $T_C$. The existence of negative exchange bias effect below $T_C$ was confirmed in our system represented by value of exchange bias field $H_{EB}$=-970 Oe measured at the temperature 2 K.

Źródło:

Acta Physica Polonica A; 2009, 115, 1; 357-359
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Ortho-Positronium Lifetime As a Detector of Spin-Crossover

Autorzy:

Bokor, M.
Marek, T.
Süvegh, K.
Böcskei, Z. S.
Buschmann, J.
Vértes, A.

Powiązania:

https://bibliotekanauki.pl/articles/2007920.pdf

Data publikacji:

1999-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.70.Bj
36.10.Dr
75.20.-g
33.25.+k

Opis:

Positron lifetime parameters were measured for the spin-crossover complexes [Fe(R-1H-tetrazole)$\text{}_{6}$](BF$\text{}_{4}$)$\text{}_{2}$ (R = 1-ethyl, 1-n-propyl) and for the diamagnetic [Zn(1-n-propyl-1H-tetrazole)$\text{}_{6}$](BF$\text{}_{4}$)$\text{}_{2}$. Positronium forms with significant intensity in the studied compounds. The ortho-para conversion of ortho-positronium was used to follow the spin-crossover. Changes of the dynamic structure were found in the propyltetrazole complex between 150 K and 90 K.

Źródło:

Acta Physica Polonica A; 1999, 95, 4; 469-473
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

The Acoustic Pressure Radiated by a Vibrating Circular Plate within the Fraunhofer Zone of the Three-Wall Corner Region

Autorzy:

Szemela, K.
Rdzanek, W.

Powiązania:

https://bibliotekanauki.pl/articles/1490263.pdf

Data publikacji:

2012-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

43.20.Ks
43.20.Rz
43.40.+s
43.20.-f
43.20.+g

Opis:

The Neumann boundary value problem has been solved for the region bounded by the three perfect rigid infinite baffles arranged perpendicularly to one another. The harmonically vibrating clamped circular plate embedded in one of the baffles is the sound source. It has been assumed that the amplitude of the plate's transverse vibrations is small to use the linear Kelvin-Voigt theory. The Green function has been applied to obtain the asymptotic formulae describing the distribution of the acoustic pressure within the Fraunhofer zone. The analysis of sound radiation has been performed for some selected surface excitations and for some different plate's locations. The acoustic pressure distribution has been examined including the acoustic attenuation and the internal attenuation of the plate's material.

Źródło:

Acta Physica Polonica A; 2012, 121, 1A; A-100-A-109
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

The Total Acoustic Power of a Clamped Circular Plate Located at the Boundary of Three-Wall Corner Region

Autorzy:

Szemela, K.
Rdzanek, W.
Pieczonka, D.

Powiązania:

https://bibliotekanauki.pl/articles/1504426.pdf

Data publikacji:

2011-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

43.20.Ks
43.20.Rz
43.40.+s
43.20.-f
43.20.+g

Opis:

The energetic aspect of the sound radiation has been analyzed in the case of the three-wall corner region. This region is the part of space bounded by three baffles arranged perpendicularly to one another. The Neumann boundary value problem has been solved assuming that the sound source is the vibrating circular plate embedded in one of the baffles of the three-wall corner region. The Kelvin-Voigt theory of a visco-elastic plate has been used which allows to include internal attenuation existing in the plate material. It has been assumed that the sound source is excited to vibrations by the external pressure asymmetrically distributed on the plate surface. The modal coefficients of the acoustic impedance have been obtained in the form of the expressions containing single integrals only. The formula describing the acoustic power of the analyzed sound source has been presented as a fourfold infinite series containing the modal coefficients of the acoustic impedance. The influence of some asymmetric excitations on the acoustic power has been analyzed. The possibilities of the modelling some uniform excitations located on the plate fragment of the small area by the point force excitation has been examined. The influence of the transverse baffles on the acoustic power has also been investigated. It has been determined for which frequency the baffles influence on the acoustic power is the greatest.

Źródło:

Acta Physica Polonica A; 2011, 119, 6A; 1050-1060
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Carbon-Encapsulated Magnetic Nanoparticles Based on Fe, Mn, and Cr for Spintronics Applications

Autorzy:

Szczytko, J.
Osewski, P.
Bystrzejewski, M.
Borysiuk, J.
Grabias, A.
Huczko, A.
Lange, H.
Majhofer, A.
Twardowski, A.

Powiązania:

https://bibliotekanauki.pl/articles/2047686.pdf

Data publikacji:

2007-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.-g
75.75.+a
75.20.En
75.30.Cr
75.50.Bb

Opis:

We succeeded in the arc-plasma synthesis of carbon-encapsulated Fe, Cr, and Mn-based nanoparticles. The transmission electron microscopy, Mössbauer spectra (of iron) and SQUID magnetometry results demonstrate that the products of the synthesis contain metals and its carbides. The nanoparticles show ferromagnetic or superparamagnetic behavior at high temperatures, which is demanded for nano-spintronics applications.

Źródło:

Acta Physica Polonica A; 2007, 112, 2; 305-310
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Elementy nowego podejścia do ochrony konsumenta na jednolitym rynku ubezpieczeniowym UE
Elements of a new approach to consumer protection in the EU single insurance market

Autorzy:

Monkiewicz, Jan
Monkiewicz, Marek

Powiązania:

https://bibliotekanauki.pl/articles/19944671.pdf

Data publikacji:

2022-03-31

Wydawca:

Szkoła Główna Handlowa w Warszawie

Tematy:

ubezpieczenia
ochrona konsumentów usług finansowych
G20
misseling
zarządzanie produktem ubezpieczeniowym
ryzyka zachowań rynkowych
insurance
financial consumer protection
product oversight and governance
product life cycle risk

Opis:

Wskutek globalnego kryzysu finansowego, ochrona konsumentów usług finansowych stała się celem szeregu inicjatyw regulacyjnych oraz obiektem zwiększonej penetracji badań naukowych. Aktualnie jesteśmy świadkami całkowitego przedefiniowania rodzajów i zakresu modelu ochrony konsumentów usług finansowych, stosowanych modeli nadzorczych, jak również porządku (układu) instytucjonalnego. Dzieje się tak w znacznym stopniu za sprawą ogólnej zmiany w paradygmacie nadzoru publicznego na rynkach finansowych. Artykuł stanowi przegląd podstawowych elementów nowego globalnego modelu ochrony konsumentów usług finansowych oraz prezentuje jego implementację na jednolitym rynku ubezpieczeniowym UE. Wskazuje ogromne zmiany, jakie zachodzą w tym względzie oraz ilustruje odejście od koncentracji na sprzedaży produktu, na rzecz podejścia holistycznego, opartego na całym cyklu życia produktu.
Financial consumer protection has become in the aftermath of a global financial crisis a target of numerous regulatory initiatives and an object of an increased academic penetration. We are witnessing a sharp redefinition of the type and scope of financial consumer protection model, applied supervisory models as well as institutional arragement. This is by far and large a result of an overall change in the regulatory supervisory paradigm of the financial markets. The paper reviews principal elements of the new global financial consumer protection model and illustrates its implementation in the single insurance market of the EU. It indicates dramatic changes in this regard and departure from point of sale to the whole life cycle approach.

Źródło:

Kwartalnik Nauk o Przedsiębiorstwie; 2022, 63, 1; 17-31
1896-656X

Pojawia się w:

Kwartalnik Nauk o Przedsiębiorstwie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Magnetic Study of Nanocrystalline TiB₂, TiC, B₄C Powders Doped to AISI 316L Austenitic Steel

Autorzy:

Bodziony, T.
Kaczmarek, S.
Biedunkiewicz, A.
Leniec, G.
Figiel, P.

Powiązania:

https://bibliotekanauki.pl/articles/1032403.pdf

Data publikacji:

2017-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

07.55.Jg
75.20.-g
75.50.-y
75.50.Bb
76.30.-v

Opis:

The investigations into ferromagnetic resonance and magnetic susceptibility of nanocrystalline TiB₂, TiC, and B₄C powders (Ti-B-C system) doped to AISI 316L austenitic steel with different amounts (3 vol.%, 5 vol.% and 7 vol.%) have been carried out. The ferromagnetic resonance spectra were recorded in the temperature range from helium up to room temperature. The three tested composite samples contain a number of magnetic phases in different proportions. They reveal a structure originating from several different complex magnetic centers. The composites revealed such magnetic phenomena as paramagnetism, (anti)ferromagnetism, and superparamagnetism. Magnetic susceptibility investigations supported the ferromagnetic resonance studies and their analysis. Magnetic properties of the TiB₂, TiC, B₄C powders doped to AISI steel may play important role in further possible applications of these composite systems.

Źródło:

Acta Physica Polonica A; 2017, 132, 1; 62-68
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Magnetic Properties of Synthetic Gehlenite Glass Microspheres

Autorzy:

Majerová, M.
Dvurečenskij, A.
Cigáň, A.
Škrátek, M.
Prnová, A.
Kraxner, J.
Galusek, D.
Maňka, J.

Powiązania:

https://bibliotekanauki.pl/articles/1032688.pdf

Data publikacji:

2017-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.05.Kf
75.50.Kj
91.60.Pn
75.20.-g
75.50.Lk

Opis:

In the paper, gehlenite amorphous microspheres were prepared by the flame synthesis of a powder precursor. In the first step, the precursor was prepared from a stoichiometric mixture of CaCO₃, Al₂O₃ and SiO₂ by a standard solid-state reaction method. Next, the precursor was sprayed into a CH₄-O₂ flame with the temperature of around 2200°C and molten droplets of synthetic gehlenite were rapidly cooled by distilled water. Structural and detailed magnetic properties were studied by the optical microscopy, X-ray diffraction and QD SQUID magnetometer. The gehlenite microspheres show a complex magnetic behaviour that is a function of the temperature and the magnetic field, e.g. diamagnetism and paramagnetism at 300 K and 2 K, respectively.

Źródło:

Acta Physica Polonica A; 2017, 131, 4; 699-701
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Wielki lockdown i deglobalizacja : wpływ pandemii Covid-19 na gospodarkę światową

Autorzy:

Jędrzejowska, Karina.

Powiązania:

Rocznik Strategiczny 2020/2021 2020/2021, t. 26, s. 173-198

Współwytwórcy:

Wróbel, Anna (politolog) Autor

Data publikacji:

2021

Tematy:

G20
Międzynarodowy Fundusz Walutowy
Światowa Organizacja Handlu (WTO)
Unia Europejska (UE)
COVID-19
Global governance
Gospodarka światowa
Lockdown
Polityka fiskalna
Rozwój zrównoważony
Stabilność finansowa
Artykuł problemowy
Artykuł z czasopisma naukowego

Opis:

Artykuł przedstawia jak COVID-19 wpłynął na gospodarkę światową w 2020 roku. Opisuje skutki pandemi wynikające z obciążenia systemów opieki zdrowia, koszty ekonomiczne oraz globalnej blokady gospodarki. Omawia sytuację gospodarczą wraz z prognozami na dlasze losy jej rozwoju. Pandemia wpłynęła nie tylko na handel światowy lecz również działania międzynarodowych instytucji finansowych.

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 52.

Tytuł:

Oscillations in Reflectivity of Samples with X-ray Waveguide Layers

Autorzy:

Pełka, J. B.
Lagomarsino, S.
Di Fonzo, S.
Jark, W.
Domagała, J.

Powiązania:

https://bibliotekanauki.pl/articles/1945221.pdf

Data publikacji:

1996-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.65.+g
78.20.Ci

Opis:

The glancing-angle reflectivity profiles in samples containing an X-ray waveguide layer are studied. Oscillations observed at angles within the region of resonance and above, are interpreted by angle dependent interference of the monochromatic X-ray beam in thin layer. The discussion is extended to the structures composed of more than one layer. Experimental reflectivity spectra recorded with Cu K$\text{}_{α}$ radiation are compared with the theoretical calculations. It leads to the model of oscillations in reflectivity consistent both for the resonant and non-resonant regions, and clarifies interpretation of oscillations in the region above the resonances. A brief discussion of potential applications of the reflectivity spectra to the studies of structure of thin layers is done.

Źródło:

Acta Physica Polonica A; 1996, 89, 3; 323-328
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Study of Photoelectron Emission Yield from Layered Structures in Presence of Resonance-Enhanced X-Ray Propagation Effect

Autorzy:

Pełka, J. B.
Lagomarsino, S.
Cedola, A.
Di Fonzo, S.
Jark, W.

Powiązania:

https://bibliotekanauki.pl/articles/1963396.pdf

Data publikacji:

1997-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.65.+g
78.20.-e

Opis:

In this work we present the new experimental results of total photoelectric yield as well as energy distribution of photoelectrons excited in a thin carbon film deposited on Ni mirror in the presence of resonance-enhanced X-ray propagation effect. The measurements were performed using conventional X-ray tube as a radiation source for the energy Cu K$\text{}_{α}$ (8047 keV). The spectra were recorded using a flow proportional electron counter with energy resolution of about 15%, and multichannel pulse height analyzer. A comparison with the reflectivity spectra recorded at the same time show an excellent correlation of both kinds of spectra, consistently with the theoretical prediction. A map of electron energy distribution is reported. Although the applied electron counter was of low energetic resolution the recorded spectra show characteristic regularities and indicate that the photoelectron yield excited in the presence of resonance-enhanced X-ray propagation effect can provide depth dependent information about impurity distribution and processes in thin layers.

Źródło:

Acta Physica Polonica A; 1997, 91, 5; 851-857
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

Partial Probabilities of X-Ray Bremsstrahlung Transitions

Autorzy:

Nietubyć, R.
Sobczak, E.
S̆imůnek, A.
Vackár̆, J.
S̆ipr, O.

Powiązania:

https://bibliotekanauki.pl/articles/1963394.pdf

Data publikacji:

1997-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

79.20.Kz
78.70.-g

Opis:

High-energy electrons bombarding a solid produce X-ray bremsstrahlung radiation, which is one of few elementary processes occurring during electron-solid interactions. Photon emission results from electron transition to an unoccupied electron state above the Fermi level. In this work matrix elements of X-ray bremsstrahlung transitions were calculated for solids containing elements from N (Z=7) to Pd (Z=46) and photon energies 1487 eV and 5415 eV. It was found that in the case of light elements the X-ray bremsstrahlung transitions to s-type final states dominate over all other symmetries. It was also shown that X-ray bremsstrahlung transition probabilities increase with decreasing photon energy and increasing atomic number Z. Dependence of X-ray bremsstrahlung transition probabilities on the electron final state energy is also presented in this work.

Źródło:

Acta Physica Polonica A; 1997, 91, 5; 841-846
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Probing the Phase Separation in the Doped Manganites by the Magnetic Resonance Methods

Autorzy:

Volkov, N.
Petrakovskii, G.
Sablina, K.
Patrin, K.

Powiązania:

https://bibliotekanauki.pl/articles/2037097.pdf

Data publikacji:

2004

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.50.+g
72.20.My

Opis:

Here we present magnetic resonance study which confirms an existence of a phase separation picture in Eu$\text{}_{0.7}$Pb$\text{}_{0.3}$MnO$\text{}_{3}$ single crystals. The measurements were performed with a standard technique and with using unconventional schemes of the magnetic resonance method. The inhomogeneous paramagnetic-ferromagnetic state, which is sensitive to a magnetic field, takes place in 0.65T$\text{}_{c}$-1.15T$\text{}_{c}$ temperature range, where the colossal magnetoresistance effect is observed. The behavior of spectra suggests that a scenario of the phase separation is realized and the mixed state is not related to a simple chemical inhomogeneity. The changes of the conductivity induced by the microwave resonance absorption are observed in a vicinity of T$\text{}_{c}$, too. The changes are not related to a trivial heating of the sample by a microwave radiation. We propose a mechanism connected with the change of equilibrium concentrations of the coexisting phases, this change takes place when the system is under magnetic resonance conditions. To analyze the experimental data we applied the effective-medium approximation for two-component system. Also we attracted the simplest phenomenological model qualitatively reproducing the essential features of the behavior of the two-phase system.

Źródło:

Acta Physica Polonica A; 2004, 105, 1-2; 69-80
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Thermally Stimulated Electron Emission from K-Bi-GICs

Autorzy:

Chrzanowski, J.
Klimkiewicz, R.
Morawski, A. W.

Powiązania:

https://bibliotekanauki.pl/articles/1968867.pdf

Data publikacji:

1998-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.20.Tx
79.75.+g
79.20.Kz

Opis:

The results of the investigations of thermally stimulated electron emission from graphite submitted to intercalation of K-Bi alloy, in the temperature range of 100-400 K, are presented. Total and partial pressure in the measuring chamber in relation to the temperature of the sample are also reported. The insertion of a K-Bi alloy into the interlayers of graphite considerably changes thermally stimulated electron emission properties. The emission images I(T) depend on the content of intercalate and the emission maxima obtained at temperatures of about 170 and 210 K are conditioned by the desorption of a gas while the total pressure above the different samples is of the same order. The desorption of gases at a temperature over 250 K does not cause any increase in the electron emission.

Źródło:

Acta Physica Polonica A; 1998, 93, 3; 531-537
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Spieralski Zdzisław Grzegorz, krypt. Z.S. (1927-1983), dziennikarz, redaktor, historyk wojskowy

Autorzy:

Getter, Zdzisław.

Powiązania:

Polski Słownik Biograficzny 2002, t. 41, z. 1, s. 97-98

Data publikacji:

2002

Tematy:

Spieralski, Zdzisław G.
Spieralski Zdzisław G.(1927-1983) biografia
Historycy wojsko biografie Polska 20 w.

Opis:

W l. 1969-1972 zastępca redaktora naczelnego w Wydawnictwie "Wiedza Powszechna".

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 58.

Tytuł:

Bałtycki skarb w Krakowie

Autorzy:

Sigmund, Marcin.

Powiązania:

Skrzydlata Polska 2015, nr 4, s. 56-59

Data publikacji:

2015

Tematy:

Muzeum Lotnictwa Polskiego (Kraków)
Douglas A-20G (samolot)
Muzea wojskowe zbiory Polska
Zbiory muzealne
II wojna światowa (1939-1945)
Samoloty bombowe

Opis:

Fot.

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 59.

Tytuł:

Resonance Superfluidity in a Quantum Degenerate Fermi Gas

Autorzy:

Kokkelmans, S.
Holland, M.
Walser, R.
Chiofalo, M.

Powiązania:

https://bibliotekanauki.pl/articles/2030471.pdf

Data publikacji:

2002-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

03.75.Fi
67.60.-g
74.20.-z

Opis:

We consider the superfluid phase transition that arises when a Feshbach resonance pairing occurs in a dilute Fermi gas. This is related to the phenomenon of superconductivity described by the seminal Bardeen-Cooper-Schrieffer theory. In superconductivity, the phase transition is caused by a coupling between pairs of electrons within the medium. This coupling is perturbative and leads to a critical temperature T$\text{}_{c}$ which is small compared to the Fermi temperature T$\text{}_{F}$. Even high-T$\text{}_{c}$ superconductors typically have a critical temperature which is two orders of magnitude below T$\text{}_{F}$. Here we describe a resonance pairing mechanism in a quantum degenerate gas of potassium ($\text{}^{40}$ K) atoms which leads to superfluidity in a novel regime - a regime that promises the unique opportunity to experimentally study the cross-over from the Bardeen-Cooper-Schrieffer phase of weakly-coupled fermions to the Bose-Einstein condensate of strongly-bound composite bosons. We find that the transition to a superfluid phase is possible at the high critical temperature of about 0.5 T$\text{}_{F}$. It should be straightforward to verify this prediction, since these temperatures can already be achieved experimentally.

Źródło:

Acta Physica Polonica A; 2002, 101, 3; 387-397
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Structure and Properties of Multilayer Nanostructured Coatings TiN/MoN Depending on Deposition Conditions

Autorzy:

Pogrebnjak, A.
Abadias, G.
Bondar, O.
Postolnyi, B.
Lisovenko, M.
Kyrychenko, O.
Andreev, A.
Beresnev, V.
Kolesnikov, D.
Opielak, M.

Powiązania:

https://bibliotekanauki.pl/articles/1365941.pdf

Data publikacji:

2014-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.46.-w
62.20.Qp
62.25.-g

Opis:

This work presents the results of TiN/MoN coatings studying. These multilayer nanostructured coatings demonstrate dependence on depositions conditions on nanometer level. The influence of nanosized monolayer thickness on structure changing and properties of nanocomposite multilayer coatings TiN/MoN was found. Multilayer TiN/MoN coatings of the total thickness from 6.8 to 8.2 μm were obtained using C-PVD method. Thicknesses of monolayers were 2, 10, 20, 40 nm. The structure of samples was studied using X-ray diffraction (Bruker D-8 Advance) in Cu $K_{α}$ radiation, high resolution transmission electron microscopy with diffraction CFEI EO Techai F200, scanning electron microscopy with energy dispersive X-ray spectroscopy (JEOL-7001F), and microhardness measurements in dependence on indenter load. Scratch tests (friction, wear, etc.) were also provided using Rockwell-C diamond indenter (CSM Revetest Instruments) with a tip radius of 200 μm. Friction and wear behavior were evaluated using ball-on-plate sliding test on a UMT-3MT tribometer (CETR, USA). With decreasing monolayer thickness the hardness value increases, and the size of nanograins reduces. The values obtained for the friction coefficient of the multilayer system is much smaller than in nanostructured coatings of TiN (nc) or MoN (nc). Annealing showed formation of a (Ti,Mo)N solid solution and small growth of nanocrystals.

Źródło:

Acta Physica Polonica A; 2014, 125, 6; 1280-1283
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Influence of Deposition Parameters and Thermal Annealing on the Structure and Properties of Nitride Coatings (TiHfZrVNb)N

Autorzy:

Pogrebnjak, A.
Abadias, G.
Chartier, P.
Bondar, O.
Yakuschenko, I.
Takeda, Y.
Krause-Rehberg, R.
Kolesnikov, D.
Beresnev, V.
Partyka, J.

Powiązania:

https://bibliotekanauki.pl/articles/1365973.pdf

Data publikacji:

2014-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.46.-w
62.20.Qp
62.25.-g

Opis:

Results of structure, phase composition, physical and mechanical properties and tribological properties investigations of nitride high-entropy coatings (TiZrHfVNb)N are presented in the paper. Proton microbeam (μ-PIXE), X-ray diffraction method, including method of X-ray strains measurements, energy dispersive X-ray spectroscopy and scanning electron microscopy analysis, microhardness testing and nanoindentation were used. Thermal annealing (t=600°C) influence on defect profiles, structure and element distribution in the coatings was investigated. It was found that thermal treatment of coatings leads to changing of defect profiles and to element redistribution. Also we can say that it influences less on grain size changing. Investigated (TiZrHfVNb)N coatings demonstrate high values of hardness and excellent wear resistance.

Źródło:

Acta Physica Polonica A; 2014, 125, 6; 1296-1298
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Wilk morski na wojnie

Autorzy:

Wójciak Tadeusz.

Powiązania:

Rzeczpospolita 2001, nr 22, s. 11

Data publikacji:

2001

Tematy:

DeWolf, Harry G.
DeWolf Harry G. (1903-2000) biografia
Admirałowie biografie Kanada 20 w.
Marynarka wojenna dowódcy biografie Kanada 20 w.

Opis:

Komendant niszczyciela "Haida". Konwojował transporty sprzętu wojskowego z Nowej Szkocji do Murmańska w 1943 r. W latach 1956-1960 dca kanadyjskiej Marynarki Wojennej.
Fot.

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 63.

Tytuł:

Heat Capacity and Elastic Constants of Fe$\text{}_{3-x}$Zn$\text{}_{x}$O$\text{}_{4}$ in the Vicinity of the Verwey Transition

Autorzy:

Kozłowski, A.
Kąkol, Z.
Schwenk, H.
Bareiter, S.
Hinkel, C.
Luthi, B.
Honig, J. M.

Powiązania:

https://bibliotekanauki.pl/articles/2013722.pdf

Data publikacji:

2000-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

62.20.Dc
63.20.-e
64.60.-i
65.40.+g

Opis:

The results of the heat capacity and elastic constant studies of Fe$\text{}_{3-x}$Zn$\text{}_{x}$O$\text{}_{4}$ (x<0.04) series are reported. Adiabatic heat capacity measurements, performed on single crystals, show the clear change of the transition character from first order for low Zn content (x<0.012) to the higher order in 0.012

Źródło:

Acta Physica Polonica A; 2000, 97, 5; 883-887
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Frequency stop band in an air-voided ZnO photonic crystal: A dispersion diagram based design

Autorzy:

Chaturvedi, V.
Kumar Roy, M.

Powiązania:

https://bibliotekanauki.pl/articles/1075558.pdf

Data publikacji:

2016-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

01.65.+g
01.70.+w
41.20.Jb
78.20.-e

Opis:

Electromagnetic excitation, inside small volumes, results in perturbations which play an important role in the validation of theoretical formulations. Efforts to catch a glimpse of the action inside of the small space, can aid better thin film designs. In the non-linear anisotropic regime the results of such interactions provide important insights into the bulk level behavior of matter. Using this approach, a zinc oxide (ZnO) based photonic crystal is designed with spherical air voids. A Gaussian continuous wave excitation of the refractive index contrast (ZnO=1.9 and Air =1) photon waveguide generated thus, is characterized for the redistribution of electromagnetic field. When, centered at a specific wavelength (1.9 μ m), the graph of the frequencies that can exist inside the crystal, is plotted against the limited k-space vector. The dispersion diagram that emerges shows a band of frequency states that cannot exist inside such a design. Physically this constitutes a k-space which is devoid of any detectable disturbances. Crystallographically, the reduced Brilluoin zone can be used to make a thin layer of ZnO that can act as a frequency stop layer, in a real multilayered photoelectric device.

Źródło:

Acta Physica Polonica A; 2016, 130, 3; 683-687
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

The Effect of Mechanical Alloying on the Microhardness and Fracture Toughness of $BaTiO_3$

Autorzy:

Ertuğ, B.
Çetiner, B.
Sadullahoğlu, G.
Gökçe, H.
Erkmen, Z.
Öveçoğlu, M.

Powiązania:

https://bibliotekanauki.pl/articles/1399670.pdf

Data publikacji:

2013-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.07.Bc
62.25.-g
81.20.Ev
62.20.mm

Opis:

In this work, the effects of mechanical alloying on the mechanical properties of $BaTiO_3$ were investigated. In order to examine the milling conditions and sintering parameters on the solid state formation of $BaTiO_3$, X-ray diffraction technique was used. After mechanical alloying process, nanosized powder mixtures were produced. Sintering temperatures were 600, 700, 800, 900, 1000, and 1200C and sintering duration was 1 h. Besides X-ray diffraction examinations, mechanical properties of the $BaTiO_3$ samples were determined by Vickers microhardness test.

Źródło:

Acta Physica Polonica A; 2013, 123, 2; 188-190
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Effect of Thermal Treatment on the Structure and Mechanical Properties of Coatings Based on (Ti, Hf, Nb, Si)N

Autorzy:

Pogrebnjak, A.
Komarov, F.
Sobol, O.
Kaverina, A.
Shypylenko, A.
Karwat, C.

Powiązania:

https://bibliotekanauki.pl/articles/1198976.pdf

Data publikacji:

2014-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.46.-w
62.20.Qp
62.25.-g

Opis:

Current paper presents the results of investigating of nanostructured cathode arc vacuum evaporation coatings, based on (Ti, Hf, Nb, Si)N. Several methods of the structural and elemental analysis were used: proton microbeam, nano- and micro-electron beam, X-ray diffraction analysis. To determine tribological properties (scratch resistance, adhesive and cohesive strength) of the coatings, scratch testing were conducting. Influence of thermal annealing at temperatures 300, 500, 800, 1000C on elemental composition, microstructure, residual stress, phase composition, profiles of atomic distribution in the coatings were investigated.

Źródło:

Acta Physica Polonica A; 2014, 125, 6; 1312-1315
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Thermoelectric Properties of $CeCu_4Ag$ Compound

Autorzy:

Kowalczyk, A.
Toliński, T.
Falkowski, M.
Timko, M.

Powiązania:

https://bibliotekanauki.pl/articles/1534756.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

65.80.-g
72.15.Cz
72.20.Pa

Opis:

The magnetic and electronic properties including electrical resistivity, thermal conductivity and thermopower are discussed for the heavy fermion $CeCu_4Ag$ compound. The electrical resistivity shows a Kondo-like logarithmic increase up to a maximum at T = 75 K. Thermopower is positive over the whole temperature range and below $T_\text{max}$ = 25 K falls rapidly. The measured thermal conductivity of the $CeCu_4Ag$ compound increases with increasing temperature.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 936-937
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Theoretical Analysis of the Short Coherence Length Superconductors

Autorzy:

Wysokiński, K.
Ciechan, A.
Krzyszczak, J.

Powiązania:

https://bibliotekanauki.pl/articles/1536554.pdf

Data publikacji:

2010-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.10.Fd
74.20.-z
74.81.-g

Opis:

Properties of the short coherence length ξ superconductors are markedly different from those with long ξ. The main difference is connected with their response to impurities. Even the s-wave superconductors have been predicted not to obey the so-called Anderson theorem and to show appreciable fluctuations of order parameter. This observation has been recently confirmed in a number of beautiful scanning tunnelling experiments on high temperature cuprate and pnictide superconductors. In this work we study clean two-band systems within BCS-type approach and impure superconductors within mean field Bogolubov-de Gennes approach. In the weak disorder limit both s-wave and d-wave superconductors only weakly react to impurities. Presence of the Van Hove singularities in the density of states of the two-band clean systems strongly increases their superconducting transition temperature if the intra-band pair scattering is the only pairing interaction. The effect of impurities on such superconductors does depend on the sign of the inter-orbital interaction.

Źródło:

Acta Physica Polonica A; 2010, 118, 2; 232-237
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Inter-Orbital Effects in the Impure Pnictide Superconductors

Autorzy:

Ciechan, A.
Wysokiński, K.

Powiązania:

https://bibliotekanauki.pl/articles/1537057.pdf

Data publikacji:

2010-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.10.Fd
74.20.-z
74.81.-g

Opis:

We study the local properties of the iron oxypnictides by means of the real space Bogolubov-de Gennes equations. Starting with the realistic energy spectrum and assuming small amount of impurities we calculate the energy dependence of the local density of states and spatial distribution of the local values of the superconducting energy gap. We pay particular attention to the role of the inter-orbital scattering of pairs and the effect of impurity scattering on the superconducting state. The effect of inter-orbital impurities depends on the relative signs of the order parameters related to two orbitals in question. For opposite signs impurities produce bound states inside the gap, while for the same sign of the order parameters they hardly affect the superconductor. The results obtained for impure systems have been shown as maps of the order parameters and local density of states. They well compare with the existing scanning tunnelling microscopy spectra of the iron pnictides.

Źródło:

Acta Physica Polonica A; 2010, 118, 2; 356-359
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Inhomogeneities in Superconductors Described by the Two-Component Model

Autorzy:

Krzyszczak, J.
Domański, T.
Wysokiński, K.

Powiązania:

https://bibliotekanauki.pl/articles/1537060.pdf

Data publikacji:

2010-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.10.Fd
74.20.-z
74.81.-g

Opis:

We study fluctuations of the superconducting order parameter of s-wave symmetry caused by nonmagnetic disorder present both in the boson and fermion subsystems using the Bogoliubov-de Gennes equations. In particular, we are interested if some features of the d-wave model persist for s-wave symmetry as well. These are: positive correlations between positions of impurities and the magnitude of energy gap, the homogeneity of the local density of states at low energies, nanoscale inhomogeneity of the coherence peak positions and their non-uniform height. We have found that spatial variations of s-wave order parameter are positively correlated with the positions of impurities. Such behavior has been observed in scanning tunneling measurements on d-wave symmetry BSCCO-2122 superconductors.

Źródło:

Acta Physica Polonica A; 2010, 118, 2; 360-363
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 71.

Tytuł:

Multicomponent (Ti-Zr-Hf-V-Nb)N Nanostructure Coatings Fabrication, High Hardness and Wear Resistance

Autorzy:

Pogrebnjak, A.
Beresnev, V.
Kolesnikov, D.
Bondar, O.
Takeda, Y.
Oyoshi, K.
Kaverin, M.
Sobol, O.
Krause-Rehberg, R.
Karwat, C.

Powiązania:

https://bibliotekanauki.pl/articles/1400429.pdf

Data publikacji:

2013-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.46.-w
62.20.Qp
62.25.-g

Opis:

First results in the field of synthesis and research of the multicomponent (Ti-Zr-Hf-V-Nb)N nanostructured coatings are presented in the paper. Influence of processes of spinodal segregation and mass-transfer on single-layered or multilayered crystal boundary (second phase) forming were explored. Superhard nanostructured coatings were investigated before and after annealing at the temperature 600°C using unique methods (slow positron beam, proton microbeam particle induced X-ray emission-μ, Rutherford backscattering-analysis, scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray diffraction analysis was performed using DRON-4 and nanoindentor). Diffraction spectra were taken point-by-point, with a scanning step 2Θp=0.05 to 0.1°. We detected that positron trapping by defects was observed on the nanograins boundaries and interfaces (vacancies and nanopores which are the part of triple and larger grain's boundary junction). The 3D distribution maps of elements obtained by the proton microbeam (particle induced X-ray emission-μ) together with the results obtained by slow positron microbeam gave us comprehensive information about physical basis of the processes, connected with diffusion and spinodal segregation in superhard coatings.

Źródło:

Acta Physica Polonica A; 2013, 123, 5; 816-818
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 72.

Tytuł:

Investigation of Nanoscale TiN/MoN Multilayered Systems, Fabricated Using Arc Evaporation

Autorzy:

Pogrebnjak, A.
Bondar, O.
Abadias, G.
Eyidi, D.
Beresnev, V.
Sobol, O.
Postolnyi, B.
Zukowski, P.

Powiązania:

https://bibliotekanauki.pl/articles/1402193.pdf

Data publikacji:

2015-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.46.-w
62.20.Qp
62.25.-g

Opis:

Using the vacuum-arc evaporation method we fabricated periodic multilayered TiN/MoN structures with different bilayer periods λ ranging from 8 to 100 nm. We found that molybdenum nitride and titanium nitride layers grown on steel show local partial epitaxy and columnar growth across interfaces. A molybdenum-titanium carbide interlayer was evidenced between the substrate and the multilayer. Molybdenum nitride and titanium nitride layers contain small (5÷30 nm) grains and are well crystallized with (100) preferred orientation. They were identified as stoichiometric fcc TiN and cubic γ-M₂N. Non-cubic molybdenum nitride phases were also detected. The hardness of the obtained structures achieved great values and maximal hardness was 31÷41.8 GPa for the multilayered structure with a 8 nm period. Hardness of the obtained coatings is 25÷45% higher in comparison with the initial single-layer nitride coatings, plasticity index of multilayered structure is 0.075.

Źródło:

Acta Physica Polonica A; 2015, 128, 5; 836-840
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 73.

Tytuł:

The Preparation and Microstructure of Semi-Solid 7075 Alloy Slurry

Autorzy:

Gan, G.
Yang, B.
Bei, S.
Mei, H.

Powiązania:

https://bibliotekanauki.pl/articles/1418959.pdf

Data publikacji:

2012-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.05.Bx
82.40.-g
98.20.Gm

Opis:

A novel technique, with which in situ $TiB_2$ particles and serpentine channels are introduced to prepare wrought aluminum alloy with higher strength, has been successfully applied to produce semi-solid 7075 alloy slurry. The effects of in situ $TiB_2$ particles and serpentine channels on the microstructure of the 7075 alloy including the grain growth behavior in the semi-solid state of the 7075 alloy were investigated. The experimental results showed that the in situ $TiB_2$ particles and serpentine channels are beneficial to increase the number of solidification nuclei and to promote uniform distribution of α-Al nuclei. As a result, the semi-solid 7075 alloy slurry with globular-like grains has been successfully produced.

Źródło:

Acta Physica Polonica A; 2012, 122, 3; 565-568
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 74.

Tytuł:

Structure and Properties of Nano- and Microcomposite Coating Based on Ti-Si-N/WC-Co-Cr

Autorzy:

Pogrebnjak, A.
Shpak, A.
Beresnev, V.
Il'yashenko, M.
Komarov, F.
Shypylenko, A.
Kaverin, M.
Zukovski, P.
Kunitskyi, Y.
Kolesnikov, D.
Kolisnichenko, O.
Makhmudov, N.

Powiązania:

https://bibliotekanauki.pl/articles/1503969.pdf

Data publikacji:

2011-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.46.-w
62.20.Qp
62.25.-g

Opis:

Using the two technologies: plasma-detonation and vacuum-arc deposition, we fabricated two types of coatings: Ti-Si-N/WC-Co-Cr/steel and Ti-Si-N/steel. We found that the top coating of Ti-Si-N was nanostructured one with 12 to 15 nm grain sizes and H = 40 to 38 GPa hardness. A thick coating which was deposited using the pulsed plasma jet, demonstrated 11 to 15.3 GPa hardness, an elastic modulus (E) changing within 176 to 240 GPa, and tungsten carbide grain dimensions varying from 150 to 350 nm to several microns. An X-ray diffraction analysis shows that the coating has the following phase composition: TiN, (Ti,Si)N solid solution, WC, $W_2C$ tungsten carbides. An element analysis was performed using energy dispersive spectroscopy (microanalysis) and scanning electron microscopy, as well as the Rutherford backscattering of $\text{}^4He^{+}$ ion and the Auger electron spectroscopy. Surface morphology and structure were analyzed using scanning electron microscopy and scanning tunnel microscopy. Tests friction and resistance (cylinder-plane) demonstrated essential resistance to abrasive wear and corrosion in the solution. The decrease of grain dimensions ≤ 10 nm occurring in the top Ti-Si-N coating layer increased the sample hardness to 42 ± 2.7 GPa under $Ti_{72}-Si_8-N_{20}$ at.% concentration.

Źródło:

Acta Physica Polonica A; 2011, 120, 1; 100-104
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 75.

Tytuł:

Pairing Correlations around Negative-U Centre in the Two-Band Model

Autorzy:

Ciechan, A.
Wysokiński, K.

Powiązania:

https://bibliotekanauki.pl/articles/1812284.pdf

Data publikacji:

2008-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

74.20.-z
74.81.-g
74.90.+n

Opis:

The electron energy spectrum of many superconducting materials is characterised by the presence of few bands at the Fermi level. In some cases the superconducting properties seem to be dominated by single band but in others the many-band approach is essential ingredient of their description. In this paper we shall study the properties of superconducting impurity placed in a non-superconducting medium. We are interested in the evolution of superconducting correlations within non-superconducting 1- or 2-dimensional system, their dependence on the distance from impurity and changes induced by the presence of the second band and interband scattering. We use real space description of the material and Bogolyubov-de Gennes approach to superconductivity.

Źródło:

Acta Physica Polonica A; 2008, 114, 1; 123-127
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 76.

Tytuł:

Real Space Bogoliubov-de Gennes Equations Study of the Boson-Fermion Model

Autorzy:

Krzyszczak, J.
Domański, T.
Wysokiński, K.

Powiązania:

https://bibliotekanauki.pl/articles/1812295.pdf

Data publikacji:

2008-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.10.Fd
74.20.-z
74.81.-g

Opis:

The boson-fermion model was proposed to describe superconductivity in short coherence length superconductors. In this work we use it to study impurity induced inhomogeneities in high temperature superconductors as found in numerous scanning tunnelling measurements. The model was formulated in real space and solved with help of Bogoliubov-de Gennes approach. Disorder in the boson or fermion subsystem is directly coupled to the superconducting order parameter and leads to severe changes of superconducting properties like local order parameter and density of states. We present the results for many impurities randomly distributed over otherwise clean and periodic two-dimensional square lattice.

Źródło:

Acta Physica Polonica A; 2008, 114, 1; 165-169
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 77.

Tytuł:

Charge Transfer Dynamics in Atom-Metal Surface Collisions

Autorzy:

Wiertel, M.
Taranko, R.
Taranko, E.

Powiązania:

https://bibliotekanauki.pl/articles/2011189.pdf

Data publikacji:

1999-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

79.20.Rf
78.70.-g
82.65.Pa

Opis:

We study the charge exchange in atom-metal collisions in the framework of the generalized time-dependent Anderson-Newns model. The electron correlations and correlated hopping are treated within the mean-field approximation. The resulting one-particle model with an effective spin-dependent atom-surface coupling is used to study the charge transfer in scattering of Na and Li atoms on metal surfaces. It is shown that the effective occupation dependent atom-surface coupling influences mainly the expectation values for producing positive, neutral, and negative particles for small work functions and high atom velocities. It is also shown that the temperature dependence of these expectation values is more visible, especially for magnetic solutions.

Źródło:

Acta Physica Polonica A; 1999, 96, 6; 769-783
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 78.

Tytuł:

The Effects of Relativistic Warm Plasma Waveguide and High Frequency Electrical Field on Beam-Plasma Interaction

Autorzy:

El-Shorbagy, Kh. H.

Powiązania:

https://bibliotekanauki.pl/articles/2047358.pdf

Data publikacji:

2007-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

52.27.Ny
52.35.-g
94.20.wf

Opis:

The paper is concerned with investigation of the influence of an intense high frequency electric field and relativistic warm plasma waveguide on electrostatic oscillations of nonuniform bounded plasma. The stabilizing effect of a strong high frequency (pump) electrical field on beam-plasma interaction in a cylindrical relativistic warm plasma waveguide is discussed. A new mathematical technique "separation method" was applied to the two-fluid plasma model to separate the equations, which describe the system, into two parts, time and space parts. Plasma electrons are considered to have a relativistic, thermal velocity. It is shown that a high frequency electric field has no essential influence on dispersion characteristics of unstable surface waves excited in a relativistic warm plasma waveguide by a low-density electron beam. The region of instability is only slightly narrowing and the growth rate decreases by a small parameter and this result was reduced comparing to cold, nonrelativistic plasma. Also, it is found that the plasma electrons did not affect the solution of the space part of the problem.

Źródło:

Acta Physica Polonica A; 2007, 112, 1; 41-48
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 79.

Tytuł:

The Fulde-Ferrell-Larkin-Ovchinnikov Superconductivity in Disordered Systems

Autorzy:

Ptok, A.

Powiązania:

https://bibliotekanauki.pl/articles/1537270.pdf

Data publikacji:

2010-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

74.20.Fg
74.20.Mn
74.20.Rp
74.25.Dw
74.81.-g

Opis:

The Fulde-Ferrell-Larkin-Ovchinnikov phase, with a spatially oscillating order parameter, may be induced by strongly magnetic field at low temperature. It is believed that the Fulde-Ferrell-Larkin-Ovchinnikov phase can exist only in homogeneous superconductors, and even weak impurity potential can lead to its destruction. The analysis of the Fulde-Ferrell-Larkin-Ovchinnikov phase in the Bogoliubov-de Gennes equation shows however, that this phase can exist in the presence of weak disorder. Using Bogoliubov-de Gennes equations, we discussed the influence of diagonal and off-diagonal disorder on the Fulde-Ferrell-Larkin-Ovchinnikov phase.

Źródło:

Acta Physica Polonica A; 2010, 118, 2; 420-422
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 80.

Tytuł:

Irlandzki sen : życie Konstancji Markiewiczowej -- komendantki IRA (1868-1927)

Autorzy:

Petrusewicz, Marta.

Współwytwórcy:

Ochab, Maryna (1946- ). Tłumaczenie

Data publikacji:

2000

Wydawca:

Warszawa : "Twój Styl"

Tematy:

Markevič, Constance G.
Markevič Constance G. (1868-1927) biografia
Irish Republican Army biografie
Nacjonalizm historia Irlandia 19-20 w.
Polityka biografie Irlandia 20 w.

Opis:

Działaczka niepodległościowa, członkini Sinn Féin. W l. 1919-22 minister pracy w powstańczym rządzie irlandzkim.
Tyt. oryg.: Un sogno irlandese : la storia di Constance Markiewicz comandante dell'IRA (1868-1927).
Bibliogr.

Dostawca treści:

Bibliografia CBW

/5

Książka

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Skocz do pozycji: 81.

Tytuł:

Investigation of Carrier Transport in GaN Single Crystals and Radiation Detectors by Thermally Stimulated Methods

Autorzy:

Kažukauskas, V.
Kalendra, V.
Vaitkus, J.-V.

Powiązania:

https://bibliotekanauki.pl/articles/2041765.pdf

Data publikacji:

2005-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.20.Jv
72.20.Fr
72.80.Ey
78.70.-g
85.30.De

Opis:

We investigated single crystals of GaN and thin film GaN radiation detectors by thermally stimulated currents and thermally stimulated depolarization methods in order to characterize carrier transport properties as influenced by material defect structure. In thick GaN no expressed structure of the thermally stimulated current spectra was observed in the temperature range from 100 K up to 350 K, which could be characteristic of the thermal carrier generation from trap levels. The experimental facts imply that the thermally stimulated current spectra might be caused not by carrier generation, but it could be due to thermal mobility changes. Therefore we had applied the numerical analysis by taking into account carrier scattering by ionized impurities and phonons. It was found that mobility limited by ionized impurities varies as T$\text{}^{2.8}$ and lattice scattering causes the dependence T$\text{}^{-3.5}$. The highest mobility values were up to 1550 cm$\text{}^{2}$/(V s) at 148-153 K. Such high values indicate relatively good quality of the single GaN thick crystals. In high resistivity GaN detectors irradiated by high doses of high-energy neutrons and X-rays current instabilities were observed which could be caused by the change of carrier drift paths in a highly disordered matter. A model of carrier percolation transport is presented.

Źródło:

Acta Physica Polonica A; 2005, 107, 2; 340-345
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 82.

Tytuł:

Influence of Irradiation by High-Energy Protons on GaN Detectors

Autorzy:

Kažukauskas, V.
Kalendra, V.
Vaitkus, J.
Jasiulionis, R.

Powiązania:

https://bibliotekanauki.pl/articles/1813395.pdf

Data publikacji:

2008-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.20.Jv
72.20.Fr
72.80.Ey
78.70.-g
85.30.De

Opis:

We had investigated effects of the irradiation by 24 GeV protons with doses ranging from $1×10^{14}$ up to $1×10^{16} p//cm^2$ on the properties of GaN ionising radiation detectors. In theγ-spectra of the samples radiation of $\text{}^7Be,$ $\text{}^{22}Na,$ and other long-lived radionuclides with A <70 was identified. Their activities were proportional to the irradiation dozes. Device contact properties were analysed by current-voltage I-V dependences. Created defects were revealed by the thermally stimulated defect spectroscopy. In the less irradiated samples the following values of the effective thermal activation energies were found: 0.12-0.16 eV, 0.18-0.22 eV, 0.35-0.42 eV, and 0.84-0.94 eV. Meanwhile, in the detectors irradiated with the highest doses only current growth with the activation energy of about 0.8-1.0 eV could be identified. Effects of percolation transport in disordered media were proved in the irradiated material.

Źródło:

Acta Physica Polonica A; 2008, 113, 3; 1013-1016
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 83.

Tytuł:

d-Wave Superconductivity in a System with Open Boundary Conditions

Autorzy:

Pisarski, P.
Harań, G.

Powiązania:

https://bibliotekanauki.pl/articles/2041464.pdf

Data publikacji:

2004-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

74.20.Rp
74.72.-h
74.78.Na
74.81.-g

Opis:

We discuss the d-wave superconductivity in confined geometry by imposing open boundary conditions on the attractive Hubbard model. Within the Bogoliubov-de Gennes approach we evaluate the order parameter and charge density distribution in the system.

Źródło:

Acta Physica Polonica A; 2004, 106, 5; 721-725
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 84.

Tytuł:

Copper Deficiency - a Crystallochemical Nature of Ce-Doped Gd$\text{}_{2}$CuO$\text{}_{4}$ Phase. Part II

Autorzy:

Horyń, R.
Bukowska, E.
Sikora, A.
Wołcyrz, M.

Powiązania:

https://bibliotekanauki.pl/articles/2041471.pdf

Data publikacji:

2004-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

64.75.+g
81.40.Rs
75.50.-y
72.20.My

Opis:

Two samples of nominal composition Gd$\text{}_{1.80}$Ce$\text{}_{0.15}$CuO$\text{}_{4.0}$ and Gd$\text{}_{1.85}$Ce$\text{}_{0.15}$CuO$\text{}_{4.075}$ were subjected for a long-term treatment in air at 1100°C, comprised with a precise control of their weights vs. time of the treatment applied. The gravimetric analysis and the iodometric titration, both showed a deficiency on Cu-site, steadily increasing vs. time with a slight tendency to a saturation. The X-ray analysis of the resulting products showed that even after 272 h of sintering, the samples remained single phase of the "214" structure type. Refinement of their crystal structures as well as density measurements, both allowed confirming Cu deficient structure constitution of these samples. Results of dc-magnetization measurements, performed prior to reduction of the sample's overall oxygen content, did not show any sign of superconductivity down to 4.2 K. These preliminary results indicate that copper deficiency, developing during synthesis, may occur to be a decisive factor for the reported lack of superconductivity in Ce-doped Gd$\text{}_{2}$CuO$\text{}_{4}$ phase. Oxygen content reduction and further tests on the samples obtained are in progress.

Źródło:

Acta Physica Polonica A; 2004, 106, 5; 733-738
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 85.

Tytuł:

Ultrafast Coherent Control of Spin Precession Motion by Terahertz Magnetic Pulses

Autorzy:

Nakajima, M.
Yamaguchi, K.
Suemoto, T.

Powiązania:

https://bibliotekanauki.pl/articles/1489996.pdf

Data publikacji:

2012-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.78.Jp
42.50.Md
76.50.+g
78.20.Ls

Opis:

We demonstrated coherent control of spin precession motion due to the ferromagnetic resonance induced by magnetic field component of ultrashort terahertz pulses. The amplitude of the precession can be controlled by the pulse separation time of the double pulse excitation technique. We succeeded in observing the energy transfer between spin and photon systems, and the energy of the spin system is returned to the second terahertz pulses instantaneously when the precession amplitude is cancelled.

Źródło:

Acta Physica Polonica A; 2012, 121, 2; 343-346
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 86.

Tytuł:

Unidirectional Charge Instability of the d-Wave Resonating Valence Bond Superconductor

Autorzy:

Raczkowski, M.
Capello, M.
Poilblanc, D.

Powiązania:

https://bibliotekanauki.pl/articles/1810295.pdf

Data publikacji:

2009-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

74.72.-h
74.20.Mn
74.81.-g
75.40.Mg

Opis:

Starting from a uniform d-wave superconducting phase we study the energy cost due to imposed unidirectional defects with a vanishing pairing amplitude. Both renormalized mean-field theory and variational Monte Carlo calculations within the t-J model yield that the energies of inhomogeneous and uniform phases are very close to each other. This suggests that small perturbations in the microscopic Hamiltonian might lead to inhomogeneous superconducting phases in real materials as observed in recent scanning tunneling microscopy on $Ca_{2-x}Na_xCuO_2Cl_2$.

Źródło:

Acta Physica Polonica A; 2009, 115, 1; 77-79
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 87.

Tytuł:

d-Wave Superconductivity, Orbital Magnetism, and Unidirectional Charge Order in the t-J Model

Autorzy:

Raczkowski, M.

Powiązania:

https://bibliotekanauki.pl/articles/1812281.pdf

Data publikacji:

2008-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

74.72.-h
74.20.Mn
74.81.-g
75.40.Mg

Opis:

Recent scanning tunneling microscopy in the superconducting regime of two different cuprate families revealed unidirectional bond-centered modulation in the local electronic density of states. Motivated by this result we investigate the emergence of modulated d-wave superconductivity coexisting with charge domains that form along one of the crystal axes. While detailed stripe profiles depend on the used form of the Gutzwiller factors, the tendency towards a valence bond crystal remains robust. We also find closely related stripe phase originating from the staggered flux phase, a candidate for the pseudogap phase of lightly doped cuprates.

Źródło:

Acta Physica Polonica A; 2008, 114, 1; 107-114
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 88.

Tytuł:

Molecular Interactions in Monolayers οf Azo Dye/Liquid Crystal Mixtures at Interfaces

Autorzy:

Bauman, D.
Płóciennik, A.
Inglot, K.

Powiązania:

https://bibliotekanauki.pl/articles/1807783.pdf

Data publikacji:

2009-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.18.-g
68.47.Pe
61.30.Gd
33.20.-t

Opis:

A study of azo dye/liquid crystal mixtures in monolayers formed at an air-water interface (the Langmuir films) and at a solid surface (the Langmuir-Blodgett films) has been performed. Five azo dyes with various molecular structure and the liquid crystal 4-octyl-4'-cyanobiphenyl (8CB) have been used. The dyes have been added to the liquid crystal at various molar fractions. Surface pressure and surface potential versus mean molecular area isotherms for the Langmuir films have been recorded and information about intermolecular interactions at the air-water interface has been obtained. On the basis of electronic absorption measurements for the Langmuir and Langmuir-Blodgett films the conclusions about the ability of dyes molecules to form self-aggregates at the interfaces have been drawn. The influence of the dye molecular structure and its concentration on aggregates' geometry has been found.

Źródło:

Acta Physica Polonica A; 2009, 116, 2; 203-210
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 89.

Tytuł:

Phase Relations in Gd$\text{}_{2}$O$\text{}_{3}$-CeO$\text{}_{2}$-CuO System at 980°C. Part I

Autorzy:

Horyń, R.
Sikora, A.
Bukowska, E.

Powiązania:

https://bibliotekanauki.pl/articles/2041467.pdf

Data publikacji:

2004-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

64.75.+g
81.40.Rs
75.50.-y
72.20.My

Opis:

Phase equilibria in Gd$\text{}_{2}$O$\text{}_{3}$-CeO$\text{}_{2}$-CuO system were studied based on samples obtained from appropriate mixtures of the starting components, prepared by a conventional solid state reaction in air. The phase relations prevalent in this system have been deduced based on X-ray diffraction of well-equilibrated samples. An isothermal cross-section diagram through the system at 980°C is presented and chemical constitution of the Ce-doped Gd$\text{}_{2}$CuO$\text{}_{4}$ phase is proposed.

Źródło:

Acta Physica Polonica A; 2004, 106, 5; 727-731
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 90.

Tytuł:

Phase and Structural Study of Self-Doped La$\text{}_{1-x-y}$Ca$\text{}_{x}$Ø$\text{}_{y}$MnO$\text{}_{3+δ}$

Autorzy:

Figueiras, F.
Araújo, J. P.
Amaral, V. S.
Tavares, P. B.
Lopes, A. B.
Vieira, J. M.

Powiązania:

https://bibliotekanauki.pl/articles/2037125.pdf

Data publikacji:

2004

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

64.75.+g
81.40.Rs
75.50.-y
72.20.My

Opis:

To understand the combined effect of divalent ion and A-site vacancy (Ø) self-doping, beyond the binary La$\text{}_{1-x}$MnO$\text{}_{3}$ system, polycrystalline La$\text{}_{1-x-y}$Ca$\text{}_{x}$Ø$\text{}_{y}$MnO$\text{}_{3+δ}$ samples were studied. Samples with Ca substitution and excess Mn in the range x<0.33 and y<0.45, respectively, were prepared by standard solid-state reactions. Structural and phase analysis of the samples were done by X-ray diffraction and transmission electron microscopy. The manganite structure in this composition range includes rhombic and orthorhombic phases. Most samples contain the hausmanite phase (Mn$\text{}_{3}$O$\text{}_{4}$) coexisting with the manganite phase. A small amount of perovskite related AMn$\text{}_{7}$O$\text{}_{12}$ (A=La,Ca) structure near the hausmanite-manganite boundary is also found in samples treated in oxygen atmosphere. The calculated vacancy content accommodated in the manganite phase can be higher than 1/8, the reported limit for La$\text{}_{1-x}$MnO$\text{}_{3}$, which is confirmed in our x=0 sample. For the compositions studied, a ferromagnetic metallic behavior below T$\text{}_{C}$ is found, confirming the stability of the Mn sublattice, and near the optimum stoichiometric ((x=0. 33, y=0) system, a net A-site vacancy content (up to y=0.2) does not degrade the magnetic and electric properties.

Źródło:

Acta Physica Polonica A; 2004, 105, 1-2; 173-182
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 91.

Tytuł:

Some Optical Aspects of Thermally Evaporated Lead Oxide Thin Films

Autorzy:

Aly, S.
Kaid, M.
El-Sayed, N.

Powiązania:

https://bibliotekanauki.pl/articles/1399301.pdf

Data publikacji:

2013-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

77.55.-g
81.15.-z
78.20.-e
78.20.Ci
78.40.-q

Opis:

The optical properties of lead oxide samples prepared using thermal evaporation technique on unheated glass substrates with different film thicknesses have been studied. The structural characteristics of a lead oxide sample was investigated using X-ray diffraction and it is confirmed to be in the amorphous state. The optical properties of the prepared films were studied by transmittance and reflectance measurements, and the integrated transmittance ($T_\text{UV}$, $T_\text{VIS}$ and $T_\text{Sol}$) in ultraviolet, visible and solar regions was calculated and found to be affected by film thickness. The dependence of absorption coefficient on wavelength was also reported. The energy gap was calculated and has been observed around 3.7 eV.

Źródło:

Acta Physica Polonica A; 2013, 124, 4; 713-716
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 92.

Tytuł:

Minister Casey odwiedza Armię Polską na Wschodzie.

Powiązania:

Orzeł Biały. Polska Walcząca na Wschodzie (Teheran) 1942, nr 30, s. 2

Data publikacji:

1942

Tematy:

Casey, R.G. mowy 1942 r.
Anders, Władysław (1892-1970)
Mowy 20 w.

Opis:

Wizyta brytyjskiego ministra ds. Środkowego Wschodu. W tekście przemówienia gen. Andersa i min. Caseya (19 X 1942).

Dostawca treści:

Bibliografia CBW

/5

Artykuł

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Skocz do pozycji: 93.

Tytuł:

Sprzęt inżynieryjny i technologie informatyczne : szerokie przyczółki gliwickiego OBRUM

Autorzy:

Cielma, Mariusz.

Powiązania:

Nowa Technika Wojskowa 2021, nr 8, s. 44-47

Data publikacji:

2021

Tematy:

Ośrodek Badawczo-Rozwojowy Urządzeń Mechanicznych "OBRUM" (Gliwice)
Przemysł zbrojeniowy
Mosty towarzyszące
MS-20 Daglezja (most)
MG-20 Daglezja-G (most)
Symulatory (techn.)
Produkcja
Artykuł z czasopisma wojskowego
Artykuł z czasopisma fachowego

Opis:

Artykuł dotyczy gliwickiej spółki OBRUM i jej produktów. Jest ona uznanym producentem sprzętu inżynieryjnego. Autor przedstawia jej produkty – most towarzyszący MS-20 Daglezja oraz MG-20 Daglezja G. Opisuje ich budowę i dane taktyczno-techniczne. OBRUM zajmuje się także remontami wykorzystywanych przez wojsko mostów, a od ponad dziesięciu lat produkcją symulatorów.
Fotografie.

Dostawca treści:

Bibliografia CBW

/5

Artykuł

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Skocz do pozycji: 94.

Tytuł:

Stan projektów mostowych dla Sił Zbrojnych RP

Autorzy:

Dmitruk, Tomasz.

Powiązania:

Nowa Technika Wojskowa 2020, nr 1, s. 42-45

Data publikacji:

2020

Tematy:

Mosty wojskowe
Mosty towarzyszące
Parki pontonowe
Mosty składane
Produkcja
Handel
MS-20 Daglezja (most)
MG-20 Daglezja-G (most)
MS-40 Daglezja-S (most)
Daglezja-P (park pontonowy)
Artykuł z czasopisma wojskowego

Opis:

Artykuł dotyczy projektów mostów wojskowych. Projekty nowych mostów weszły w decydującą fazę. Przedstawiono problemy związane z produkcją mostów i zakupem ich przez wojsko.

Dostawca treści:

Bibliografia CBW

/5

Artykuł

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Skocz do pozycji: 95.

Tytuł:

Structural and Optical Characterisation of Hydrogenated Soda-Lime Silicate Glasses Doped with Silver and Copper

Autorzy:

Suszyńska, M.
Krajczyk, L.
Macalik, B.

Powiązania:

https://bibliotekanauki.pl/articles/2037038.pdf

Data publikacji:

2003-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.43.Fs
64.75.+g
68.37.Lp
78.20.-e
78.40.Ha

Opis:

The results of comparative studies of the effect of hydrogenation upon structural and optical properties of the commercial soda-lime silicate glasses doped either with monovalent silver or copper have been presented. The samples were characterised by means of the scanning and transmission electron microscopy and the UV-VIS-IR absorption spectroscopy. It has been shown that the annealing of suitably ion-exchanged specimens in gaseous hydrogen atmosphere could be considered as an effective procedure for obtaining composite materials of expected properties correlated with the induced changes of the morphology of both the glassy matrix and the dopant.

Źródło:

Acta Physica Polonica A; 2003, 104, 6; 559-569
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 96.

Tytuł:

Some Properties of the Model of a~Superconductor with Pair Hopping and Magnetic Interactions at Half-Filling

Autorzy:

Kapcia, K.

Powiązania:

https://bibliotekanauki.pl/articles/1431185.pdf

Data publikacji:

2012-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.10.Fd
71.10.-w
74.20.-z
74.81.-g
75.30.Fv

Opis:

We present our preliminary studies of an effective model of a superconductor with short coherence length involving magnetic interactions. The Hamiltonian considered consists of (i) the effective on-site interaction U, (ii) the intersite magnetic exchange interactions ($J^z,$ $J^{xy}$) between nearest-neighbors and (iii) the intersite charge exchange term I, determining the hopping of electron pairs between nearest-neighbor sites. In the analysis of the phase diagrams and thermodynamic properties of this model for half-filling (n=1) we have adopted the variational approach, which treats the on-site interaction term exactly and the intersite interactions within the mean-field approximation. One finds that the system considered can exhibit very interesting multicritical behaviors (including tricritical, critical-end and bicritical points) caused by the competition between magnetism and superconductivity, even for n=1. Our investigations show that, depending on the values of interaction parameters, the system at half-filling can exhibit three homogeneous phases: superconducting (SS), (anti-)ferromagnetic (F) and nonordered (NO). The transitions between ordered phases (SS, F) and the NO phase can be first order as well as second order ones, whereas SS-F transition is first order one. Temperature dependencies of the order parameters and thermodynamic properties of the system at the sequence of transitions: SS→F→NO with increasing temperature for J/I=0.3, U/I_0 = 0.69 and n=1 are also presented.

Źródło:

Acta Physica Polonica A; 2012, 121, 4; 733-737
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 97.

Tytuł:

Long-Lasting Current Transient Phenomena in TlBr

Autorzy:

Kažukauskas, V.
Ziminskij, A.
Vainorius, N.
Gostilo, V.
Shorohov, M.
Bozhko, V.

Powiązania:

https://bibliotekanauki.pl/articles/1506282.pdf

Data publikacji:

2011-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.55.-i
72.20.Jv
72.40.+w
72.60.+g
72.80.Jc

Opis:

The persistent conductivity effects in TlBr were evidenced at the temperatures below about 200 K after the intrinsic light excitation. They were associated with the filling of the trapping states having thermal activation energy of about 0.08-0.12 eV and accompanied by the appearance of the pronounced maximum of the thermally stimulated currents. In this state the enhanced photoconductivity was observed that could be thermally quenched above about 180 K. The quenching is initiated by the emptying of the trapping states having activation energy of 0.63-0.65 eV.

Źródło:

Acta Physica Polonica A; 2011, 119, 2; 268-270
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 98.

Tytuł:

Optical Properties and Microstructure of InGaN Grown by Molecular Beam Epitaxy

Autorzy:

Böttcher, T.
Einfeldt, S.
Figge, S.
Kirchner, V.
Hommel, D.
Selke, H.
Ryder, P. L.
Bertram, F.
Riemann, T.
Christen, J.
Lunz, U.
Becker, C. R.

Powiązania:

https://bibliotekanauki.pl/articles/1969025.pdf

Data publikacji:

1998-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.35.Dv
68.65.+g
78.20.-e
78.55.-m
78.55.Cr

Opis:

The luminescence of In$\text{}_{x}$Ga$\text{}_{1-x}$N is studied for thick epitaxial layers and quantum wells. Using spatially resolved cathodoluminescence spectroscopy the commonly observed broad integral photoluminescence spectra were found to result from spectral and lateral inhomogeneous emission across the samples. Moreover, the integral photoluminescence and absorption spectra show different temperature dependences. The effects can be explained assuming fluctuations of the composition associated with a variation of the band gap.

Źródło:

Acta Physica Polonica A; 1998, 94, 2; 260-264
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 99.

Tytuł:

First-Principles Calculations of Structural, Electronic, Optical, and Thermodynamic Properties of CdS, CdTe and Their Ternary Alloys $CdS_{1-x}Te_{x}$ (0.0 ≤ x ≤1.0)

Autorzy:

Ameri, M.
Mesbah, S.
Al-Douri, Y.
Bouhafs, B.
Varshney, D.
Ameri, I.

Powiązania:

https://bibliotekanauki.pl/articles/1364167.pdf

Data publikacji:

2014-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

31.15.E-
63.20.dk
04.25.-g
78.66.Hf
73.61.At

Opis:

Using first-principle method, we investigate the structural, electronic, optical, and thermodynamic properties of the $CdS_{1-x}Te_x$ semiconductor alloys using generalized gradient approximation for the exchange-correlation potential calculation. The ground state properties are determined for the bulk materials (CdS and CdTe) in cubic phase. Quantities such as the lattice constants and bulk modulus of interest are calculated. Detailed comparisons are made with published experimental and theoretical data and show generally good agreement. The calculated lattice constants scale linearly with composition (Vegard's law). The microscopic origins of the bowing parameter were explained using the contributions from volume deformation, charge transfer and structural relaxation approach. The refractive index and optical dielectric constant for the alloys of interest were calculated by using different models. In addition, the thermodynamic stability of the alloys was investigated by calculating the critical temperatures of alloys.

Źródło:

Acta Physica Polonica A; 2014, 125, 5; 1110-1117
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 100.

Tytuł:

Computational material analysis of structural and hemodynamic model of coronary stent by CFD/FEA in computer aided mechanical engineering approach

Autorzy:

Karaçal, Ö.

Powiązania:

https://bibliotekanauki.pl/articles/1070469.pdf

Data publikacji:

2016-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

87.85.G-
81.70.Bt
82.20.Wt
87.10.Kn
87.15.A-

Opis:

With the development of new technologies, it is very popular to use a coronary stent that is a small mesh tube-shaped medical device deployed to treat narrow or weak arteries as part of a procedure called percutaneous coronary intervention. Several aspects, such as stent design, stent wire type, mechanical and material characteristics of stent have different influences on stent intervention. It has not been reported about what impacts on stent struts by the hemodynamic behavior on stent material and very few numerical studies have considered both the mechanical and hemodynamic impact of stent implementation. Computational simulation method for realization of realistic structural and hemodynamic micro environment model in this research provided valuable results of long-term functional knowledge of stent material behavior that are time consuming and expensive to determine otherwise. Computational fluid dynamics and finite element analysis simulation models were investigated and developed to evaluate engineering properties that affect stent functional attributes. These characteristics are dependences of material properties on blood flow conditions such as structural load, shear-strain rate, radial strength, and wall shear stresses, which need to be scientifically explored. To understand the material (Fe-18Cr-14Ni-2.5Mo as stainless steel 316LVM) mechanical performance of the stent, a finite element analysis simulation model was established when exposed to pulsatile blood pressure. In this study, computational fluid dynamics model was generated to calculate the wall shear stresses and strain distribution in stented vessel carrying blood to heart. The analytical analysis of mechanical and hemodynamic conduct of a stent in this investigation may help for better designs of stent, and provide deeper comprehension to support clinical cardiovascular surgeons and guide potential therapeutic strategies.

Źródło:

Acta Physica Polonica A; 2016, 130, 1; 249-251
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

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