Skocz do pozycji: 1.

Tytuł:

A Processual Approach to the Study of Transitions of Middle School (Gymnasium) Teachers

Autorzy:

Kędzierska, Hanna

Powiązania:

https://bibliotekanauki.pl/articles/1932748.pdf

Data publikacji:

2020-06-30

Wydawca:

Wydawnictwo Adam Marszałek

Tematy:

middle schools teachers
transitions
managing transitions strategy
processual approach

Opis:

This paper presents the results of research carried out during the first stage of the Polish education system transition process initiated by the education reform of 2017. The study was conducted with teachers of schools to be dissolved, who decided to transform their institutions into a new type of school – general education secondary school (lyceum), while retaining staff and organizational resources of the hitherto middle schools (gymnasium). A processual approach adopted in this project allowed me to capture the changes as they were happening and the analysis of the conditions of transition trajectories.

Źródło:

Kultura i Edukacja; 2020, 2(128); 139-155
1230-266X

Pojawia się w:

Kultura i Edukacja

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:

Report on multiconfiguration-interaction calculations of transitions in lead

Autorzy:

Horodecki, P.
Sienkiewicz, J. E.

Powiązania:

https://bibliotekanauki.pl/articles/1954025.pdf

Data publikacji:

1998

Wydawca:

Politechnika Gdańska

Tematy:

multiconfiguration-interaction calculations
lead transitions
quadruple electric transitions
GRASP2

Opis:

Relativistic multiconfiguration-interaction calculations of the dipole magnetic and quadruple electric transitions in the lead atom have been calculated. The computer program GRASP2 (General Relativistic Atomic Structure) has been used.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 1; 97-100
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Shifting Professional Identities and Perspectives: Negotiating Learning Transitions from the Field of Public Health

Autorzy:

Meyer, Lois

Powiązania:

https://bibliotekanauki.pl/articles/2141941.pdf

Data publikacji:

2012-03-31

Wydawca:

Wydawnictwo Naukowe Dolnośląskiej Szkoły Wyższej

Tematy:

public health
professional identities
learning transitions

Opis:

Research on the intersection of adult learning, transitions and identity has largely focused on unidirectional changes such as moving from higher education to the workplace. Recently there has been a call to move beyond such linear conceptions and to acknowledge that learning transitions are more complex requiring nuanced studies of their multidirectional and multilevel characteristics as individuals in late modernity engage in transformations nested within broader social changes and flux. This paper outlines a current qualitative longitudinal study focusing on the learning transitions of a group of practitioners from clinical backgrounds as they undertake a professional doctorate in population health. The study draws on the concepts of vertical and horizontal transitions to trace shifting understandings of the practitioners as they seek to negotiate their professional identities and practices through time and space into becoming senior public health professionals. Their subjective responses are explored as positioned within individual life histories and larger narratives of transformation in the field of public health and higher education.

Źródło:

Teraźniejszość – Człowiek – Edukacja; 2012, 15, 1(57); 93-110
1505-8808
2450-3428

Pojawia się w:

Teraźniejszość – Człowiek – Edukacja

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:

Governance and decentralized energy transitions: a comparative case study of three medium-sized cities in Sweden, Canada, and the United States.

Autorzy:

Boucher, Martin

Powiązania:

https://bibliotekanauki.pl/articles/14157333.pdf

Data publikacji:

2020-02-12

Wydawca:

Wyższa Szkoła Bankowa we Wrocławiu

Tematy:

Sustainability transitions
comparative method
urban energy systems
decentralized energy
governance challenges
and energy transitions.

Opis:

  Aim: This study examines the impact of governance on decentralized energy transitions. Knowledge of how particular jurisdictions and their governance arrangements influence these transitions can help strengthen and contextualize divergent trajectories of decentralized energy transitions and—most importantly—reveal the role of geographical context in policy change.   Design: This research gap is addressed in this paper by comparing the uptake of decentralized energy transitions in three cities in three different countries—Luleå (Sweden), Saskatoon (Canada), and Anchorage (United States). The jurisdictions in each city has unique governance contexts pertaining to electric utilities, regulations, public policy, and public acceptance.  By comparing these transitions, this study highlights the governance considerations for decentralized energy transitions and asks how does governance impact decentralized energy transitions in cities? To answer this question, actors within various public, private, and sectoral capacities were interviewed to provide their insights on decentralized energy transitions in each jurisdiction.   Conclusion: I present five governance dimensions that impact decentralized energy transitions and explain how these factors can be included to provide a more contextual understanding of patterns of decentralized energy transitions in cities.   Originality: Much of the literature on decentralized energy and cities has focused on project and sectoral level analysis and hasn’t considered the holistic nature of the energy system transition. A particular gap that would help inform a broader understanding is the jurisdictional governance impacts of decentralization energy transitions.   Implications of the Research: In practical terms, the results could be used to inform inter-jurisdictional comparisons of decentralization energy projects.   Limitations of the Research: Given that there were three case studies, it is not possible to make generalizable claims from the results.  

Źródło:

Central European Review of Economics and Management; 2020, 4, 1; 71-106
2543-9472

Pojawia się w:

Central European Review of Economics and Management

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Introductory Comments

Autorzy:

Sujecka, Jolanta

Powiązania:

https://bibliotekanauki.pl/articles/508974.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Instytut Slawistyki PAN

Tematy:

Civilisation
images
transitions
borders

Opis:

Introductory CommentsThe sixth issue (not just in the Thematic Section) is devoted to the borders of civilization in our memory, in culture, in art, in literature, in the arrangement of political objectives. Both their demarcation and their crossing is a matter of the objectives we can and want to set ourselves in the context of the order that exists and into which we try to fit, transforming it or levelling.The value of this survey of  “images of borders” is its setting in such varied material, owing to which the theoretical speculations gain a representative illustration and, at the same time, a guarantee of being rooted, even if it is only a “contact zone”. WprowadzenieSzósty numer (nie tylko sekcja tematyczna) jest poświęcony kwestii granic cywilizacji w naszej pamięci, kulturze, sztuce, literaturze, w definiowaniu celów politycznych. Zarówno ich wyznaczanie, jak i przekraczanie, jest kwestią celów, jakie możemy i chcemy postawić sobie w kontekście istniejącego ładu, w który staramy się wpisać, przekształcając go lub dostosowując się do niego. Wartością niniejszego przeglądu "obrazów granic" jest przedstawienie ich poprzez tak zróżnicowany materiał, dzięki czemu rozważania teoretyczne zyskują reprezentatywną ilustrację, a zarazem gwarancję zakorzenienia, nawet jeśli będzie to tylko "sfera kontaktu".

Źródło:

Colloquia Humanistica; 2017, 6
2081-6774
2392-2419

Pojawia się w:

Colloquia Humanistica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

A review of phase transitions in RbIn-molybdate

Autorzy:

Zapart, M. B.
Zapart, W.

Powiązania:

https://bibliotekanauki.pl/articles/146342.pdf

Data publikacji:

2013

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

electron magnetic resonance (EMR)
trigonal double molybdates
incommensurate phase
ferroelastics
phase transitions

Opis:

The paper gives a brief review of the results of EPR temperature studies of RbIn(MoO4)2 crystal. A sequence of several structural phase transitions has been found in this crystal in the temperature region 84–163 K. The transition at T1 = 163 K leads to an incommensurate triply modulated state, whereas ferroelastic phases start below T2 = 143 K. All the low temperature phases in the temperature region 84–143 K are examples of simultaneously ferroelastic and incommensurate ones. The transition observed at T5 = 84 K seems to suppress the ferroelastic properties of the crystal.

Źródło:

Nukleonika; 2013, 58, 3; 365-370
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Non-equilibrium phase transitions, coherence and chaos

Autorzy:

Sewell, Geoffrey

Powiązania:

https://bibliotekanauki.pl/articles/1342262.pdf

Data publikacji:

1998

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Opis:

We present a scheme for the theory of phase transitions in open dissipative systems, and show that its demands are fulfilled by quantum stochastic models of open systems, such as the laser.

Źródło:

Banach Center Publications; 1998, 43, 1; 349-358
0137-6934

Pojawia się w:

Banach Center Publications

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:

Exotic phase transitions in RERhSn compounds

Autorzy:

Łątka, K.
Kmieć, R.
Kruk, R.
Pacyna, A.
Rams, M.
Schmidt, T.
Pöttgen, R.

Powiązania:

https://bibliotekanauki.pl/articles/148856.pdf

Data publikacji:

2003

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

magnetic properties
phase transitions
Mössbauer spectroscopy

Opis:

Crystal and magnetic properties of three equiatomic ternary RERhSn compounds (where RE = Ce, Nd, Gd) have been studied by means of X-ray diffraction, ac, and dc magnetic susceptibility measurements, as well as using Mössbauer spectroscopy with 119Sn and 155Gd resonances. CeRhSn does not order magnetically down to 2 K while NdRhSn undergoes ferromagnetic transition at TC = 10.3 K and GdRhSn orders antiferromagnetically below TN = 16 K. Our CeRhSn and NdRhSn samples become superconductive below 6.5 K and 6.9 K, respectively.

Źródło:

Nukleonika; 2003, 48,suppl.1; 35-40
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Shale gas development: managing economic transitions

Autorzy:

Jackson, R.

Powiązania:

https://bibliotekanauki.pl/articles/298994.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

shale gas

Opis:

Shifts in populations and economic structure are as old as population settlements themselves. As technologies change and economies adapt, regional comparative advantages also evolve. Among the most consequential of recently developed new technologies is horizontal drilling, which has opened vast regions of the world to the extraction, development,and use of low-cost energy from shale gas. Economic transitions and structural change are inevitable. The challenge for regional economists, policymakers, and economic developers lies in the identifying and managing these transitions in ways that maximize benefits and minimize the costs that accompany them. Complicating this challenge is the recognition that the geographic distributions of costs and benefits of economic development often do not coincide. This spatial mismatch of costs and benefits has been prominent historically in regional resource boom and bust cycles, many of which have been fed specifically by energy resources. The resources of energy rich regions have often been exploited in ways that provide short- term regional economic benefits and disruption, longer-term economic development often accompanied by environmental and physical infrastructural degradation. Recognizing that we are entering the early stages of one of the most substantial resource based shifts in economic structure in the history of energy resource development, we have the opportunity and the obligation to learn from successes and failures ofprevious economic transition management efforts, and to design strategies that will maximize the benefits and minimize the negative consequences of shale gas development. This contribution identifies and elaborates upon four critical dimensions of the transition management challenge. The first dimension includes the economic and environmental aspects of the extraction activities including drilling, materials assembly and usage including employment, income, capital equipment, and consumables, both manufactured and natural. The second dimension identifies the negative externalities of impacts on off-site physical infrastructure, with a special emphasis on transport infrastructure. In attempting to minimize negative consequences, programs should be developed to leave affected areas no worse off, at worst, and better off if possible. The road network involved in support drilling can extend well beyond the obvious transport arteries, even to jurisdictions that are not direct beneficiaries of severance taxes or impacts fees. The third dimension centers on economic structural changes related to upstream and downstream activities in the production and supply chains, and the fourth dimension concerns the roles of and impacts upon social and institutional structures.

Źródło:

AGH Drilling, Oil, Gas; 2013, 30, 1; 317-318
2299-4157
2300-7052

Pojawia się w:

AGH Drilling, Oil, Gas

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Introduction to the Thematic Section

Autorzy:

Sajkowski, Wojciech

Powiązania:

https://bibliotekanauki.pl/articles/508978.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Instytut Slawistyki PAN

Tematy:

borders
civilisation
image
transitions

Opis:

Introduction to the Thematic SectionThe images of the borders of civilizations is the main topic of the thematic section of this issue of Colloquia Humanistica. In the call for papers it was emphasised, that this issue is particularly important, because the notion of civilization is strictly related to the issue of borders since it would became meaningless without the opposition to another civilization, or the lack of it. The juxtaposition between the notion of civilization and its different antinomies seems easier to display when seen from its centre, however the shape of its border is not always clear, even if it has a foundation in clear geographical or political divisions. Thus, this border can be represented as a linear frontier between a civilized state and barbaric lands, or as a borderland which encompasses some kind of fluent transition. The civilization border can be also represented in a macro scale, shaping geographic divisions of the continents (as it was in the case of the Balkans), but its depiction can also concern the micro scale, for example the difference between an urban and a natural landscape. The notion is even broader, because it is not only treated in the context of space but also social behaviours and their evolution (which is bound with notion of the progress since the Enlightenment). The question establishing the difference between the civilized and the uncivilized is still shaping the identity of modern societies, and thus it is worth attention. Wprowadzenie do sekcji tematycznejTematem przewodnim szóstego numeru rocznika Colloquia Humanistica są obrazy granic cywilizacji. Temat ten wydaje się niezwykle istotny, ponieważ pojęcie cywilizacji ściśle wiąże się z kategorią granicy, skoro traci ono znaczenie, gdy nie zachodzi opozycja wobec innej cywilizacji. Zestawienie pojęcia cywilizacji i jego różnych antynomii najłatwiej przejawia się, jak się wydaje, z perspektywy centrum, jednakże kształt jej granic nie zawsze rysuje się wyraźnie, nawet gdy wywodzi się ona z jasnych podziałów geograficznych czy politycznych. Granicę może zatem reprezentować linia między cywilizowanym państwem a krajami barbarzyńskimi lub też pogranicze, stanowiące coś w rodzaju płynnego przejścia. Granicę cywilizacji można też przedstawić w makroskali poprzez podziały geograficzne na kontynencie (jak ma to miejsce w przypadku Bałkanów), lecz jej obraz dotyka również mikroskali, na przykład różnicy między krajobrazem miejskim a naturalnym. Pojęcie to ma wręcz szerszy charakter, ponieważ porusza kontekst nie tylko przestrzenny, lecz również kwestię zachowań społecznych i ich ewolucję (od czasu oświecenia związaną z pojęciem postępu). Kwestia ustanowienia granicy między cywilizowanym a niecywilizowanym wciąż wpływa na kształt tożsamości współczesnych społeczeństw i dlatego warto podjąć się jej zbadania.

Źródło:

Colloquia Humanistica; 2017, 6
2081-6774
2392-2419

Pojawia się w:

Colloquia Humanistica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Contemporary transitions of Polish religiosity – from institutional to private dimension

Autorzy:

Dębski, Maciej

Powiązania:

https://bibliotekanauki.pl/articles/691602.pdf

Data publikacji:

2005

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Źródło:

Space – Society – Economy; 2005, 07
1733-3180
2451-3547

Pojawia się w:

Space – Society – Economy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Kinetics of Polymorphic Transitions in Energetic Compounds

Autorzy:

Chukanov, N. V.
Zakharov, V. V.
Korsunskiy, B. L.
Chervonnyi, A. D.
Vozchikova, S. A.

Powiązania:

https://bibliotekanauki.pl/articles/358796.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

polymorphic transitions
energetic compounds
molecular crystals
kinetics
calorimetry
IR spectroscopy

Opis:

Available data on the kinetics of polymorphic transitions (PTs) in energetic compounds under isothermal conditions are summarized and discussed. It is shown that the general kinetic regularities of these processes (stepwise and continuous regimes) depend on their topotactic mode (frontal or quasi-homogeneous, respectively). In reverse PTs, a nucleation stage is not observed, which is explained by the presence of nuclei of the low-temperature polymorph in the preheated sample. The influence of mechanical effects on the kinetics of PTs in molecular crystals is discussed.

Źródło:

Central European Journal of Energetic Materials; 2016, 13, 2; 483-504
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Thermodynamics of solids with a state equation

Autorzy:

Wojnar, R.

Powiązania:

https://bibliotekanauki.pl/articles/279690.pdf

Data publikacji:

1999

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

thermodynamics
thermoelasticity
phase transitions

Opis:

The thermodynamic relations describing equilibrium of a multi--phase thermoelastic solid are obtained in a way similar to that used in the multiphase fluid theory. The phase transitions of the first order are defined and equilibrium equations of the Capeyron--Clausius type are derived. Also, the phase transistions of the second order are introduced and equilibrium equations of the Ehrenfest type are obtained. A general theory is illustrated by examples.
Analizujemy związki termodynamiczne opisujące równowagę ciała termosprężystego złożonego z wielu faz. Czynimy to w sposób podobny do stosowanego w teorii płynów wielofazowych. Po określeniu przejść fazowych drugiegi i trzeciego rodzaju wyprowadzamy związki typu Clapeyrona--Clausiusza i Ehrenfesta. Ogólną teorię uzupełniamy przykładami.

Źródło:

Journal of Theoretical and Applied Mechanics; 1999, 4; 809-827
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Pricing and data science: The tale of two accidentally parallel transitions

Autorzy:

Wallusch, Jacek

Powiązania:

https://bibliotekanauki.pl/articles/2231660.pdf

Data publikacji:

2023-07-20

Wydawca:

Uniwersytet Ekonomiczny w Poznaniu

Opis:

Accidentally parallel at the beginning, the transition to val ue-based pricing and transiotin to pricing data science have blended harmoniously, changing the pricing landscape. Using the marketing capability approach, I show that the introduction of pricing data science is costly and requires higher management support. Despite its cost, algorithmic price optimisation allows one to react swiftly to changes in demand. The optimisation process is applied to inherent ly non-linear, multimodal, and right-skewed pricing data. Presenting the interactions between new computational techniques and value-data pricing, I concentrate on altered percepotins of price elasctiity, value-driver esmtiaotins, and contract opportunity analysis. I would like to thank to Małgorzata Majewska-Wallusch and Syed Ali Abbas for comments on the earlier drafts of this paper. I would also like to thank Irina Nezbudiy, Gabor Kapus, Tomasz Wyszyński, Maximilien Jougounoux, Boris Moroseac, Michał Taraszewski, Izabela Mikuła, Grzegorz Bańda, Radosław Stropa, Paul Wilkins, Claudia Espiati Bonilla, Arkhip Tikh, Natalie Sologuren, Nick Holnaider, and Patrick Moreau for sharing with me their invaluable pricing and data science experience.

Źródło:

Economics and Business Review; 2023, 9, 2; 115-132
2392-1641

Pojawia się w:

Economics and Business Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Correlation-Driven Metal-Insulator Transitions

Autorzy:

Honig, J. M.

Powiązania:

https://bibliotekanauki.pl/articles/2011236.pdf

Data publikacji:

2000-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.30.+h
71.45.Gm

Opis:

The effect of correlation-driven electronic transitions are described for the V$\text{}_{2}$O$\text{}_{3}$, NiS$\text{}_{2-x}$Se$\text{}_{x}$, and Fe$\text{}_{3}$O$\text{}_{4}$ systems. The various tranformations can all be rationalized in terms of elementary concepts pertaining to the Mott-Hubbard intraatomic electronic interactions or in terms of an order-disorder formalism involving Coulomb interactions among electrons on adjacent sites. Attention is directed to some outstanding issues that require further resolution.

Źródło:

Acta Physica Polonica A; 2000, 97, 1; 141-156
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Youth, Mobility and Generations – the Meanings and Impact of Migration and Mobility Experiences on Transitions to Adulthood

Autorzy:

Krzaklewska, Ewa

Powiązania:

https://bibliotekanauki.pl/articles/579663.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

MOBILITY
POST-ACCESSION MIGRATION FROM POLAND
TRANSITION TO ADULTHOOD
YOUTH TRANSITIONS
ADULTHOOD
YOUTH
RETURN MIGRANTS
GENERATION

Opis:

The article reflects on the role of mobility within transition to adulthood process. It will present the results of research focusing on the transitions to adulthood of representatives of the generation born at the beginning of the 1980s in Poland. This boom generation experienced both the transformation from a communist to a capitalist state, as well as the joyful and hopeful moment of Poland’s accession to the EU in 2004. Post-2004, faced with high unemployment, the representatives of this age cohort decided to leave Poland en masse in search of employment opportunities. Based on biographical interviews with young Poles born in the early 1980s and living in Poland, the article reflects upon the meaning of mobility and migration experiences in their young age. What was mobility impact on different transition to adulthood trajectories – employment, family or independent living? How has it affected the concept of adulthood? In the article, the mobility experience will be looked upon through the lenses of theories of youth studies, which is a recent trend in analyzing young people’s mobility or migration. The article points to the three meanings of mobility: mobility as an experience of semi-independence, mobility as time to gain adulthood, and mobility as a celebration of youth. As the experience of this cohort is unique in the historical sense, it is also exemplary for the growing importance of mobility in transitions to adulthood.

Źródło:

Studia Migracyjne - Przegląd Polonijny; 2019, 45, 1 (171); 41-59
2081-4488
2544-4972

Pojawia się w:

Studia Migracyjne - Przegląd Polonijny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Coloured-noise-induced transitions in nonlinear structures

Autorzy:

Mankin, R.
Laas, T.
Soika, E.
Sauga, A.
Rekker, A.
Ainsaar, A.
Ugaste, U.

Powiązania:

https://bibliotekanauki.pl/articles/147752.pdf

Data publikacji:

2008

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

non-equilibrium fluctuations
coloured-noise-induced transitions
mean-field approximation
Hopf bifurcation
stochastic Lotka-Volterra system

Opis:

In a stochastic framework, macroscopic approaches are sought to describe microscopic interaction between different species. Coloured-noise-induced transitions in stochastic N-species Lotka-Volterra systems are considered analytically as an appropriate model extendable to many natural and nano-technological processes. All the results discussed are computed by means of a dynamical mean-field approximation. It is demonstrated that interplay of coloured noise and interaction intensities of species can generate a variety of cooperation effects, such as discontinuous transitions of the mean population density, noise-induced Hopf bifurcations and relaxation oscillation. The necessary conditions for the cooperation effects are also discussed. Particularly, it is established that, in the case of the Beddington functional response, in certain parameter regions of the model an increase in noise correlation time can cause multiple transitions (more than two) between relaxation oscillatory regimes and equilibrium states.

Źródło:

Nukleonika; 2008, 53, 3; 127-134
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Hamilton-Jacobi/ Canonical Phase Transitions of Ashtekar LQG-Polyakov Strings: World Sheet Dynamics as Regelation through the d = 3 + 1 Spacetime

Autorzy:

Kabe, Koustubh

Powiązania:

https://bibliotekanauki.pl/articles/1179195.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Ashtekar connectio-dynamics
Loop Quantum Gravity
Nambu-Goto action
Polyakov path integral
phase transitions
string theory

Opis:

The following paper takes up an Ashtekar connectio-dynamics and algebraic quantum field theoretic treatment of a relativistic quantum string without SUSY and hence in four spacetime dimensions treats the Polyakov dynamics of a relativistic quantum string given explicitly by the Polyakov path integral in terms of a “canonical” phase transition where the string is imagined as a thread regelating through the “ice cube” of spacetime.

Źródło:

World Scientific News; 2017, 83; 206-211
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Discontinuous Phase Transitions in S-Paired Fermi Systems

Autorzy:

Mulak, M.
Gonczarek, R.

Powiązania:

https://bibliotekanauki.pl/articles/1968488.pdf

Data publikacji:

1997-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

74.20.-z

Opis:

The most general S-paired systems of fermions for which a gap equation can be separated according to the specific redefined variables, are considered. Moreover, a solution of this gap equation (gap energy) is obtained in a parametric form. It allows us to investigate thermodynamic properties of such systems i.e. the thermodynamic potential, entropy, heat capacity and critical magnetic induction. We show also that the heat capacity difference between the superconducting and the normal phase is entirely determined by the order parameter. The obtained results reveal possibilities of discontinuous phase transition to the normal state and moreover, the theorem on existence of such transitions is formulated and proved. The condition for the BCS-type energy gap is given, which additionally classifies properties of the heat capacity of S-paired phase by virtue of the shape of the energy gap. In order to illustrate the developed formalism, the numerical results for the so-called statistical spin liquids and application of the established methods to the experimental data conversion, are presented and discussed.

Źródło:

Acta Physica Polonica A; 1997, 92, 6; 1177-1189
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:

Thomas-Reiche-Kuhn Sum Rule for Electron Transitions in Solids

Autorzy:

Olszewski, S.

Powiązania:

https://bibliotekanauki.pl/articles/1968973.pdf

Data publikacji:

1998-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Bh

Opis:

A well-known sum rule obtained for electron transitions between the atomic states by Thomas, Reiche and Kuhn (TRK) is examined for the case of transitions between delocalized electron states in cubic lattices. A characteristic point of the original TRK sum rule for the atomic states was its lack of dependence on the initial state of transitions. This situation holds also for the free-electron states in a metal but is changed in the case of electrons influenced by the presence of the field of the crystal core. Corrections to the original TRK result can be represented as a function of the quantum parameter labelling the initial electron state. Other moments of the spectral distribution function than those leading to the TRK sum rule have been calculated. A comparison of the relations found between different spectral moments for solids with similar relations obtained by Traini for the spectral moments of the atomic states has been done.

Źródło:

Acta Physica Polonica A; 1998, 94, 1; 49-70
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:

Phase transitions in the borate minerals from the Kłodawa Salt Dome (Central Poland) as the indicators of the temperature processes in salt diapirs

Autorzy:

Wachowiak, J.
Toboła, T.

Powiązania:

https://bibliotekanauki.pl/articles/2060065.pdf

Data publikacji:

2014

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

boracite
congolite
phase transitions
temperature study
Zechstein
salt dome
Kłodawa
Polska

Opis:

The diapiric structures of the Polish Lowlands are tectonically deeply seated down to the autochthonous Zechstein strata at a depth of ca. 6 km. In the process of deep burial and halokinetic diapirism, the salt rocks were subjected to diagenetic and metamorphic transformations, with the temperature being an essential factor. Considering the thermal gradient, a temperature of up to ca. 200°C can be achieved in the salt dome within a depth range from several hundred metres to 6 km, which may lead to transformations of the majority of salt minerals. Phase transitions of two borate minerals – boracite and congolite from the Kłodawa salt dome – provide evidence for higher temperatures in the salt dome rocks. The authigenic euhedral crystals of those borate minerals display their external habitus in ambient temperature in the form of regular symmetry (F43c – pseudo-regular polyhedrons), whereas their internal structure is lower: orthorhombic (Pca21) for boracite and rhombohedral (R3C) for congolite. The heating and cooling of boracite and congolite crystals show reversible phase transition. At a temperature of ca. 270°C, boracite crystals change their symmetry: orthorhombic ↔ cubic. In the case of congolite three reversible phase transitions within a temperature range of 50–339°C can be observed: rhombohedral ↔ monoclinic ↔ orthorhombic ↔ cubic symmetry. Those phase transitions, confirmed experimentally in our study, clearly document at least local occurrences of temperatures exceeding 339°C in the Kłodawa salt dome.

Źródło:

Geological Quarterly; 2014, 58, 3; 543--554
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Critical Phenomena : Towards Modeling with Cellular Automata

Autorzy:

Wiśniewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/92942.pdf

Data publikacji:

2007

Wydawca:

Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach

Tematy:

phase transitions
cellular automata
self-organized criticality

Opis:

The paper presents basic description methods of critical phenomena, i.e. first-order, continuous phase transitions, and an overview of the self-organized criticality concept. In this approach an attempt is made to identify the determinant factors of modeling critical events using cellular automata.

Źródło:

Studia Informatica : systems and information technology; 2007, 2(9); 69-76
1731-2264

Pojawia się w:

Studia Informatica : systems and information technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Positron annihilation in liquid crystals

Autorzy:

Dryzek, E.
Juszyńska-Gałązka, E.

Powiązania:

https://bibliotekanauki.pl/articles/148118.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

liquid crystals
positron annihilation
phase transitions

Opis:

Positron annihilation studies of liquid crystals are reviewed with particular reference to thermotropic liquid crystals with rod-like molecules. The studies of compounds exhibiting smectic A or smectic E phases indicate that local arrangement of dipole molecules play an important role because high electron density at the end group of molecules can influence substantially formation and annihilation of positronium. The obtained ortho-positronium lifetimes in these phases can be explained by antiparallel pairing of molecules in case of the smectic A phase or a structure with a nanosegregation of alkyl chains and others parts of molecules into sublayers and liquid-like state of alkyl chains in case of the smectic E phase.

Źródło:

Nukleonika; 2015, 60, No. 4, part 1; 703-708
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Slope failure on a Cambrian carbonate platform, mass-flow transitions and resulting complex deposit

Autorzy:

Wang, Zhaopeng
Liu, Jiaye
Van Loon, A. J. (Tom)
Zhu, Decheng
Qin, Peng
Han, Zuozhen

Powiązania:

https://bibliotekanauki.pl/articles/2058558.pdf

Data publikacji:

2020

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Gushan Formation
Middle Cambrian
epeiric sea
carbonate platform
mass-flow transitions

Opis:

The quiet environment of the carbonate platform in the epeiric sea that existed during the Cambrian between present-day China and Korea was occasionally affected by processes that have hitherto not been described from such a setting. A conglomerate was found in the Middle Cambrian Gushan Formation near Chengouwan (Shandong Province, E China), eroded into the underlying sediments. The conglomerate is explained as a deposit consisting of material that was eroded up-slope when slope-failure took place, resulting in a slump that passed into a high-density debris flow with erosive power that passed, in turn, again into a slump. The slump came to rest when it lost its momentum on a less inclined part of the basin slope. Immediately after deposition, fluidization occurred in the lower part of the slump deposit, as proven by a funnel-shaped water-escape structure and a lateral injection of some metres long of brecciated material.

Źródło:

Geological Quarterly; 2020, 64, 1; 3--15
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Oscillator Strengths for Allowed Transitions in Li(II)

Autorzy:

Ateş, Ş.
Çelik, G.

Powiązania:

https://bibliotekanauki.pl/articles/1807774.pdf

Data publikacji:

2009-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

31.15.ag
32.70.Cs

Opis:

Electric dipole oscillator strengths have been computed for transitions between both multiplet and individual lines in the Li(II) ion. The weakest bound electron potential model theory has been used. We have employed both numerical Coulomb approximation wave functions and numerical non-relativistic Hartree-Fock wave functions in the determination of expectation values of radii. The necessary energy values have been taken from experimental ionization energies. The oscillator strengths calculated with parameters obtained by using the two different wave functions have been compared not only to each other but also to other data taken from literature. A good agreement with results in literature has been obtained.

Źródło:

Acta Physica Polonica A; 2009, 116, 2; 169-175
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:

Mobile transitions to adulthood and soft skills of Polish and Lithuanian return migrants
Mobilne wchodzenie w dorosłość i kompetencje miękkie polskich i litewskich migrantów powrotnych

Autorzy:

Grabowska, Izabela
Jastrzębowska, Agata

Powiązania:

https://bibliotekanauki.pl/articles/2156593.pdf

Data publikacji:

2022

Wydawca:

Lubuskie Towarzystwo Naukowe

Tematy:

mobile transitions to adulthood
soft skills
return migrants
mobilne wchodzenie w dorosłość
kompetencje miękkie
migranci powrotni

Opis:

The main aim of this article is to analyse the interplay between international migration, life events related to transition to adulthood and the acquisition of soft skills as a result of working and living abroad. The article is based on an online survey conducted in spring and summer 2020 among 740 Polish and Lithuanian return migrants from the UK who returned to Poland and Lithuania. International migration helped them, above all, to acquire both English language communication skills and to learn teamwork - soft skills which are important for career development. In both groups of Polish and Lithuanian return migrants, international migration accelerated three key processes: 1. starting to make independent decisions, 2. becoming financially independent from their parents and 3. finding stable employment. In both groups, becoming financially independent was linked significantly to the high level of soft skills acquired abroad.
Głównym celem artykułu jest analiza zależności między migracją międzynarodową, wydarzeniami życiowymi związanymi z wchodzeniem w dorosłość i nabywaniem kompetencji miękkich w wyniku pracy i życia za granicą. Artykuł powstał na podstawie ankiety internetowej przeprowadzonej wiosnąi latem 2020 roku wśród 740 polskich i litewskich migrantów powrotnych zWielkiej Brytanii, którzy wrócili do Polski i na Litwę. Migracje zagraniczne pomogły im, przede wszystkim, w nabyciu zarówno kompetencji komunikacyjnych w języku angielskim, jak i pracy zespołowej - kompetencji miękkich, które są ważne dla rozwoju kariery. W obu grupach migrantów powrotnych z Polski i Litwy migracje zagraniczne przyspieszyły trzy kluczowe procesy: 1. rozpoczęcie samodzielnego podejmowania decyzji; 2. uniezależnienie się finansowo od rodziców oraz 3. znalezienie stabilnego zatrudnienia. W obu grupach usamodzielnienie się finansowo wiązało się istotnie z wysokim poziomem kompetencji miękkich nabytych za granicą.

Źródło:

Rocznik Lubuski; 2022, 48, 1; 159-174
0485-3083

Pojawia się w:

Rocznik Lubuski

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Thermodynamic Interpretation of Pressure-Induced Spin Transitions in Thiosemicarbazonates of Iron(III)

Autorzy:

Krupska, A.

Powiązania:

https://bibliotekanauki.pl/articles/1399168.pdf

Data publikacji:

2013-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.70.-a
82.60.-s

Opis:

The thermodynamic interpretation of the spin transition in iron(II) complexes taking into consideration cooperative domains is given in the literature. We use a similar interpretation for thiosemicarbazonates of aromatic aldehydes of iron(III) compounds. We extend the spin transition interpretation to pressure-induced spin transitions. The relationship between a domain size n and the interaction between a high spin and a low spin states Γp given by Gütlich et al. allows us to deduce a modified equation of the spin transition pressure $p_{c}$ (at the temperature $T=T_{c}$). On the basis of this equation, the content of the fraction of the high spin state γ and of the fraction of the low-spin state, 1-γ, as a function of pressure can be theoretically estimated. The derived equation enables us to predict the width of hysteresis which refers to the high spin and low spin states formed under the high pressure as a result of the spin transition.

Źródło:

Acta Physica Polonica A; 2013, 124, 4; 626-628
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:

Magnetic Phase Transitions in TbNi(Al,In) Compounds

Autorzy:

Klicpera, M.
Javorský, P.
Šantavá, E.

Powiązania:

https://bibliotekanauki.pl/articles/1534258.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.30.-m
75.40.Gb

Opis:

The magnetic phase transitions in $TbNiAl_{1-x}In_{x}$ compounds were investigated by ac-susceptibility measurements. Our data reveal magnetic ordering with transition temperatures between 40 and 70 K, depending on the In concentration. All the studied compounds exhibit two or more phase transitions accompanied by distinct anomalies in the real and imaginary part of the ac-susceptibility. The paramagnetic Curie temperatures remain positive in the whole series.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 881-883
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Urban Climate Change Governance in China 2015

Autorzy:

Maria, Francesch-Huidobro,
Qianqing, Mai,

Powiązania:

https://bibliotekanauki.pl/articles/902877.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego

Tematy:

governance
climate change
low carbon transitions
Chinese cities

Opis:

W ciągu ostatnich 30 lat Chiny doświadczyły gwałtownego rozwoju ekonomicznego i urbanizacyjnego. Spowodowało to degradację środowiska i znaczne zużycie infrastruktury oraz surowców naturalnych. Podczas gdy chiński poziom rozwoju może spowalniać, kraj ten będzie dalej dążyć do obniżenia emisji CO2, ponieważ jego gospodarka wciąż będzie znacząco przyczyniała się do wzrostu efektu cieplarnianego. Niniejszy artykuł skupia się na wyzwaniach związanych z obniżeniem emisji dwutlenku węgla przez Chiny. Praca analizuje cechy charakterystyczne dla gospodarki miejskiej Chin, kształt polityki rozwoju i konsumpcję energii miejskiej jako czynniki mające największy wpływ na zmiany klimatyczne. W konkluzji autorki stwierdzają, że istnieje pilna potrzeba prowadzenia dalszych badań nad zmianami w zarządzaniu miast w celu określenia tych czynników, które mają największy wpływ na zmiany klimatyczne.

Źródło:

Studia Iuridica; 2016, 63; 219-233
0137-4346

Pojawia się w:

Studia Iuridica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Order-disorder structural transitions in synthetic filaments of fast and slow skeletal muscle myosins under relaxing and activating conditions.

Autorzy:

Podlubnaya, Zoya
Malyshev, Sergey
Nieznański, Krzysztof
Stępkowski, Dariusz

Powiązania:

https://bibliotekanauki.pl/articles/1044221.pdf

Data publikacji:

2000

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

method of slow skeletal muscle myosin preparation.
Ca2+-induced structural transitions
myosin filaments
fast and slow skeletal muscle myosin

Opis:

In the previous study (Podlubnaya et al., 1999, J. Struc. Biol. 127, 1-15) Ca2+-induced reversible structural transitions in synthetic filaments of pure fast skeletal and cardiac muscle myosins were observed under rigor conditions (-Ca2+/+ Ca2+). In the present work these studies have been extended to new more order-producing conditions (presence of ATP in the absence of Ca2+) aimed at arresting the relaxed structure in synthetic filaments of both fast and slow skeletal muscle myosin. Filaments were formed from column-purified myosins (rabbit fast skeletal muscle and rabbit slow skeletal semimebranosus proprius muscle). In the presence of 0.1 mM free Ca2+, 3 mM Mg2+ and 2 mM ATP (activating conditions) these filaments had a spread structure with a random arrangement of myosin heads and subfragments 2 protruding from the filament backbone. Such a structure is indistinguishable from the filament structures observed previously for fast skeletal, cardiac (see reference cited above) and smooth (Podlubnaya et al., 1999, J. Muscle Res. Cell Motil. 20, 547-554) muscle myosins in the presence of 0.1 mM free Ca2+. In the absence of Ca2+ and in the presence of ATP (relaxing conditions) the filaments of both studied myosins revealed a compact ordered structure. The fast skeletal muscle myosin filaments exhibited an axial periodicity of about 14.5 nm and which was much more pronounced than under rigor conditions in the absence of Ca2+ (see the first reference cited). The slow skeletal muscle myosin filaments differ slightly in their appearance from those of fast muscle as they exhibit mainly an axial repeat of about 43 nm while the 14.5 nm repeat is visible only in some regions. This may be a result of a slightly different structural properties of slow skeletal muscle myosin. We conclude that, like other filaments of vertebrate myosins, slow skeletal muscle myosin filaments also undergo the Ca2+-induced structural order-disorder transitions. It is very likely that all vertebrate muscle myosins possess such a property.

Źródło:

Acta Biochimica Polonica; 2000, 47, 4; 1007-1017
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Second-Order Phase Transitions in Magnetic Ca₃Al₂(SiO₄)(Oₕ¹⁰) and Non Magnetic Cubic ZnO

Autorzy:

Kunert, H.

Powiązania:

https://bibliotekanauki.pl/articles/1386491.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp

Opis:

Possible symmetry of modes those may cause transitions in magnetic and non magnetic crystals as well as lower space subgroup symmetries of the crystals have been found. The Landau-Lifshitz theory for non magnetic crystals has been reformulated for magnetic crystals and has been applied to Ca₃Al₂(SiO₄)(Oₕ¹⁰). Some experimental data confirm our results.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 439-441
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:

Coupling of Infrared Radiation to Intersubband Transitions in Tunneling Superlattices

Autorzy:

Nalewajko, C.
Załużny, M.

Powiązania:

https://bibliotekanauki.pl/articles/1991960.pdf

Data publikacji:

1998-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.30.Fs
73.20.Dx

Opis:

The influence of the interference effects on the intersubband absorption line shape in weakly tunneling superlattices is discussed within the framework of nonlocal effective medium approximation.

Źródło:

Acta Physica Polonica A; 1998, 94, 3; 446-448
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:

Chemical Potential Derivative as Hallmark for Phase Transitions

Autorzy:

Pietruszka, M.
Matlak, M.

Powiązania:

https://bibliotekanauki.pl/articles/2011158.pdf

Data publikacji:

1999-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

64.60.-i
75.40.Cx
75.50.Ee

Opis:

We study antiferromagnetic properties of the two-band extended s-f model with fluctuating valence in the context of two mutually bound new effects of chemical potential critical behaviour, as well as of critical electron redistribution. In order to exemplify both phenomena we build phase diagrams of the system displaying the dependence of the critical Néel temperatures (T$\text{}_{N}$) of the system versus 4f (5f) level positions. The phase diagram consists of two different areas corresponding to antiferromagnetic and paramagnetic phases. We plot the magnetizations and the correlation functions of the system as functions of temperature. Next, we investigate the temperature dependence of the relative average occupation numbers Δn$\text{}^{f(d)}$ and the chemical potential Δμ for a given 4f (5f) level position E$\text{}_{f}$. Plotting this quantities along the E$\text{}_{f}$ cross-section lines we observe small (of the order of 10$\text{}^{-4}$-10$\text{}^{-3}$) but well localized kinks exactly at the Néel temperature T$\text{}_{N}$. Last but not least, we plot the first derivative of the chemical potential dμ/dT which, as it shows clearly visible jumps at T$\text{}_{N}$, may turn out to be very accurate and sensitive (auxiliary) tool to find critical temperatures of the considered system. Moreover, we plot the difference μ$\text{}_{AF}$-μ$\text{}_{PARA}$ where we subtract a chemical potential value of a reference paramagnetic sample from the actual value of the antiferromagnetic system. Also in this case we report the observation of discontinuous change in slope at T$\text{}_{N}$. Our observations can be extended to point out to a new practical possibility of how to find experimentally the critical temperatures of the antiferromagnetic systems exclusively from the chemical potential measurements. We expect that the same type of measurement, according to our recent and present results, would also apply to all types of critical phenomena in real solids.

Źródło:

Acta Physica Polonica A; 1999, 96, 6; 725-732
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:

Second-Order Phase Transitions in Non-Magnetic Wurtzite ZnO and Magnetic Doped with Co

Autorzy:

Kunert, H.
Niyongabo, P.

Powiązania:

https://bibliotekanauki.pl/articles/1385751.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp

Opis:

We investigate the second-order phase transitions in non-magnetic wurtzite ZnO and magnetic doped with cobalt. Using reformulated Landau-Lifshitz theory of second-order phase transitions and our computer program, we have found all possible lower space group symmetries of ZnO and ZnO doped with Co as well as symmetries of vibration modes which may cause structural phase transitions. We interpret the Raman phonon modes of magnetic doped ZnO according to corepresentations of the magnetic space group P6'₃m'c (ZnO magnetic). Some experimental techniques like X-ray diffraction, reflectivities and Raman spectroscopies can verify our theoretical results.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 400-403
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:

Canonical distributions and phase transitions

Autorzy:

Athreya, K
Smith, J

Powiązania:

https://bibliotekanauki.pl/articles/729916.pdf

Data publikacji:

2000

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

canonical distribution
canonical ensemble
Gibbs state
phase transition
entropy maximization
Rényi entropy

Opis:

Entropy maximization subject to known expected values is extended to the case where the random variables involved may take on positive infinite values. As a result, an arbitrary probability distribution on a finite set may be realized as a canonical distribution. The Rényi entropy of the distribution arises as a natural by-product of this realization. Starting with the uniform distributionon a proper subset of a set, the canonical distribution of equilibriumstatistical mechanics may be used to exhibit an elementary phase transition, characterized by discontinuity of the partition function.

Źródło:

Discussiones Mathematicae Probability and Statistics; 2000, 20, 2; 167-176
1509-9423

Pojawia się w:

Discussiones Mathematicae Probability and Statistics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Analysis of the Phase Transitions in BNT-BT Lead-Free Ceramics Around Morphotropic Phase Boundary by Mechanical and Dielectric Spectroscopies

Autorzy:

Silva Jr, P. S.
Diaz, J. C. C. A.
Florêncio, O.
Venet, M.
M’Peko, J. C.

Powiązania:

https://bibliotekanauki.pl/articles/353072.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Lead-free piezoelectric ceramics
morphotropic phase boundary
phase transitions
mechanical spectroscopy
dielectric spectroscopy

Opis:

In this work, the syntheses and characterization by mechanical and dielectric spectroscopies of (1-x) Bi_0.5Na_0.5TiO_3-xBaTiO₃ (BNT-100xBT), with x = 0.05, 0.06 and 0.07, lead-free piezoelectric ceramics is reported. Ceramic samples of BNT-BT have been prepared by mixed-oxide method and then conventionally sintered. X-ray diffraction patterns of sintered samples, indicated for BNT-7BT the presence of tetragonal (P4mm) complex perovskite structure, whereas for BNT-5BT and BNT-6BT the samples exhibit a mixture of tetragonal (P4mm) and rhombohedral (R3c) crystalline phases, which reveal the presence of a morphotropic phase boundary (MPB) in the BNT-BT system. Measurements of internal friction, Q-1, and the storage modulus, E’, as a function of temperature at various frequencies were carried out in a Dynamic Mechanical Analyzer (DMA), in the temperature range from 0ºC to 600ºC. Dielectric profiles are recorded in the frequency range from 1kHz to 100kHz and the temperature range from room temperature to 475ºC. Mechanical loss spectra obtained for investigated compositions of BNT-BT samples showed different frequency-independent anomalies. Two main anomalies for BNT-5BT and BNT-6BT, observed around 100ºC and 430ºC were associated with the ferroelectric-antiferroelectric and antiferroelectricparaelectric phase transitions, respectively. The results obtained from mechanical loss measurements were supported by dielectric relaxation spectra. For BNT-7BT, outside the MPB, four different frequency-independent processes were observed.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 1; 17-20
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 37.

Tytuł:

Tracing cluster transitions for different cluster types

Autorzy:

Ntoutsi, I.
Spiliopoulou, M.
Theodoridis, Y.

Powiązania:

https://bibliotekanauki.pl/articles/970818.pdf

Data publikacji:

2009

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

dynamic environments
change detection
cluster-type-specific indicators

Opis:

Clustering algorithms detect groups of similar population members, like customers, news or genes. In many clustering applications the observed population evolves and changes over time, subject to internal and external factors. Detecting and understanding changes is important for decision support. In this work, we present the MONIC+ framework for cluster-type-specific transition modeling and detection. MONIC+ encompasses a typification of clusters and cluster-type-specific transition indicators, by exploiting cluster topology and cluster statistics for the transition detection process. Our experiments on both synthetic and real datasets demonstrate the usefulness and applicability of our framework.

Źródło:

Control and Cybernetics; 2009, 38, 1; 239-259
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Phase Transitions and Stability of Group IV BCC Metals

Autorzy:

Verma, M. L.
Verma, A.
Rathore, R. P. S.

Powiązania:

https://bibliotekanauki.pl/articles/1968848.pdf

Data publikacji:

1998-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

62.20.Dc

Opis:

Born stability criteria were employed in the framework of extended generalised exponential potential to calculate the theoretical strength and range of stability of a perfect uniaxially stressed crystal lattice of group IV bcc metals: titanium, zirconium, and hafnium. The analysis depicts two ranges of stability, a bcc phase and a body centered tetragonal phase. The computed value of theoretical strength and strain of bcc Ti, Zr and Hf agree satisfactorily with the experimental limits. The second-order elastic constants C$\text{}_{11}$ and C$\text{}_{12}$ were also computed.

Źródło:

Acta Physica Polonica A; 1998, 93, 3; 479-489
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:

What a Difference a Brick Makes? Transitions of Memory and Shanghai Shikumen Walls

Autorzy:

Pawlik, Karolina

Powiązania:

https://bibliotekanauki.pl/articles/2040204.pdf

Data publikacji:

2021-10-04

Wydawca:

Wydawnictwo Uniwersytetu Śląskiego

Tematy:

brick
Shanghai
ink painting
dreamstone
longtang

Opis:

This essay is intended as an appreciation of an overlooked element of Chinese material culture: discarded blue bricks from demolished shikumen houses in Shanghai. It contemplates the concept and materiality of a wall from a unique perspective, combining insights from Chinese architecture history and scholarly tradition of appreciating stones. Combining scientific and poetic approaches, the author argues that these bricks can be contemplated analogically to ink landscape paintings and famous Dali dreamstones. The author uses these clay objects as a starting point to reflect on the rapid transformation of Chinese cities and complex relationship between enduring tradition and ongoing modernization.

Źródło:

Śląskie Studia Polonistyczne; 2021, 18, 2; 1-12
2084-0772
2353-0928

Pojawia się w:

Śląskie Studia Polonistyczne

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 40.

Tytuł:

KTaO3 a perovskite for water and air treatment

Autorzy:

Różańska, Anna
Namieśnik, Jacek

Powiązania:

https://bibliotekanauki.pl/articles/1179565.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

hydrothermal method
perovskite
photocatalytic activity
potassium tantalate
transitions metals

Opis:

Perovskites are inorganic compounds that exhibit dielectric properties. These minerals belong to the crystal ceramics family. These compounds are described by the formula: ABX3 where, A and B are 2, 3 or 4 valuable metal ions, and X is an ion of oxygen or fluorine. An example of perovskite is the compound KTaO3. There are many methods for producing KTaO3, but the hydrothermal method is most commonly used. Perovskites can be characterized by magnetic, photocatalytic and electrical properties. For this reason, the most effective methods for obtaining perovskite structures are sought, and research methods for their characterization are developed. In this thesis, KTa0.8A0.2O3 (A = Co, Fe, Ni) was obtained by hydrothermal method. The influence of dopants on the photocatalytic was verified. As a result of experiments, it was found that two samples had a single phase the pyrochlore structure (KTaO3 and KTa0.8Fe0.2O3). The Ni-doping increased photocatalytic activity, while Fe-doping reduced photocatalytic activity.

Źródło:

World Scientific News; 2017, 75; 73-80
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Quantum and Spontaneous Breakage of Translational Symmetry due to Light Excitation in Photo-Induced Structural Phase Transitions

Autorzy:

Nasu, K.

Powiązania:

https://bibliotekanauki.pl/articles/1489998.pdf

Data publikacji:

2012-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.90.+t

Opis:

Real time quantum dynamics of the spontaneous translational symmetry breakage due to light excitation in the early stage of photo-induced structural phase transitions is reviewed under the guide of the Toyozawa theory, which is in exact compliance with the conservation law of the total momentum. At the Franck-Condon state, an electronic excitation just created by a visible photon is in a plane wave state, extended all over the crystal. While, after the lattice relaxation having been completed, it is localized as a new excitation. So, is there the shrinkage of the excitation wave function? No! The wave function never shrinks, but only the spatial (or inter lattice-site) quantum coherence (interference) of the excitation disappears, as the lattice relaxation proceeds. This is the breakage of translational symmetry.

Źródło:

Acta Physica Polonica A; 2012, 121, 2; 347-349
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 42.

Tytuł:

Przejścia dla zwierząt na odcinku S17 między węzłami „Kurów Zachód” a „Lublin Felin”
Animal transitions on the section of S17 expressway between junctions "Kurów West" and "Lublin Felin"

Autorzy:

Kowal, M.
Karaś, S.

Powiązania:

https://bibliotekanauki.pl/articles/1205478.pdf

Data publikacji:

2016

Wydawca:

Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej

Tematy:

ochrona środowiska
droga ekspresowa S17
przejścia dla zwierząt
environmental protection
expressway S17
animals transitions

Opis:

W artykule opisano parametry i efektywność elementów ochrony środowiska drogi ekspresowej S17 w formie przejść dla zwierząt. Przedstawione zostały obiekty inżynierskie na odcinku od węzła „Kurów Zachód” do węzła – „Lublin Felin”. Opisano wymagania ochrony środowiska na etapie projektowania oraz podczas realizacji budowy. Zaprezentowano rozwiązania konstrukcyjne obiektów oraz podstawowe funkcje tych przejść. Podsumowano trafność zastosowanych rozwiązań obiektów i ich lokalizacji w terenie.
The article describes service parameters and effectiveness of the environmental elements of animal crossings on the S17 expressway. Animal transitions on the section of S17 expressway between junctions "Kurów West" and "Lublin Felin" were described. The requirements of environmental protection at the design stage and during the construction works were shown. Article gives an accunt of the works performed in order to protect the natural environment in areas adjacent to the route, and solutions provided to design objects and the basic functions of animal transitions. Paper summarizes the relevance of the applied solutions and their locations in the field.

Źródło:

Budownictwo i Architektura; 2016, 15, 1; 71-80
1899-0665

Pojawia się w:

Budownictwo i Architektura

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 43.

Tytuł:

Heat and Mass Transfer During Phase Transitions in Liquid Mixtures
Przenoszenie ciepła i masy podczas przemian fazowych w mieszaninach ciekłych

Autorzy:

Pavlenko, Anatoliy
Koshlak, Hanna

Powiązania:

https://bibliotekanauki.pl/articles/1811785.pdf

Data publikacji:

2019

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

thermophysical characteristic
gas-saturated liquid
gas-vapor bubble
heat transfer
two-phase media
phase transitions
charakterystyka termofizyczna
ciecz nasycona gazem
pęcherzyk gazowo-parowy
wymiana ciepła
ośrodek dwufazowy
przejścia fazowe

Opis:

The work is devoted to the study of the transient processes of heat and mass transfer in the volume of a liquid. The method of calculating the temperature field in a liquid takes into account phase transitions, motion of the bubble wall and heat exchange processes near its surface. The method takes into account the change in the thermophysical characteristics of a liquid when its temperature changes. The results of the research can be used to optimize the various technological processes associated with cavitation, boiling and the formation of gas hydrates. Of particular interest are the processes of spontaneous boiling of superheated liquids under conditions when the liquid is in a non-equilibrium metastable state, since studying the kinetics of metastable state dysfunction can contribute to the creation of new high-intensity technologies for creating gas emulsions, as well as combustion and explosion technologies. The proposed method will allow a numerical analysis of the processes of destruction or the creation of gas hydrates, emulsions, taking into account both thermal and dynamic aspects of the problem.
Praca poświęcona jest badaniu przejściowych procesów przenoszenia ciepła i masy w objętości cieczy. Metoda obliczania pola temperatury w cieczy uwzględnia przemiany fazowe, ruch ściany pęcherzykowej i procesy wymiany ciepła w pobliżu jej powierzchni. Metoda uwzględnia zmianę właściwości termofizycznych płynu w miarę zmian temperatury. Wyniki badań można wykorzystać do optymalizacji różnych procesów technologicznych związanych z kawitacją i tworzeniem się hydratów gazowych. Szczególnie interesujące są procesy samorzutnego wrzenia przegrzanych cieczy w warunkach, w których ciecz jest w stanie nierównowagi metastabilnej, ponieważ badanie kinetyki dysfunkcji stanu metastabilnego może przyczynić się do stworzenia nowych technologii tworzenia emulsji gazowych, jak również technologii spalania i wybuchu. Proponowana metoda pozwoli na analizę numeryczną procesów niszczenia lub tworzenia hydratów gazowych, emulsji, biorąc pod uwagę zarówno termiczne, jak i dynamiczne aspekty problemu.

Źródło:

Rocznik Ochrona Środowiska; 2019, Tom 21, cz. 1; 234-249
1506-218X

Pojawia się w:

Rocznik Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Między uniwersytetem a światem pracy. Tranzycje w narracjach studentów polskich i hiszpańskich
Between university and the world of employment. Transitions in the narration of Polish and Spanish students

Autorzy:

Czubak-Koch, Magdalena
González Monteagudo, José
Nizińska, Adrianna
Padilla-Carmona, Teresa

Powiązania:

https://bibliotekanauki.pl/articles/431680.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

tranzycje
zatrudnialność
studenci nietradycyjni
rynek pracy
transitions
employability
non-traditional students
labor market

Opis:

W niniejszym artykule autorzy prezentują pewną część badań prowadzonych w ramach europejskiego projektu badawczego EMPLOY – Enhancing the employability of non-traditional students in HE (Wzmacnianie zatrudnialności studentów nietradycyjnych). Projekt promuje wzmacnianie zatrudnialności (employability) studentów nietradycyjnych przez poprawę skuteczności przechodzenia (tranzycji) ze świata uczelni wyższej na rynek pracy. W artykule zostały przedstawione wyniki cząstkowe badań narracyjnych z uwzględnieniem perspektywy nietradycyjnych studentów hiszpańskich i polskich, zapre-zentowanej w ujęciu komparatystycznym. Autorzy, w interpretacjach uzyskanych wyników badań, wykorzystali głównie koncepcje tranzycji w uczeniu się przez całe życie. W tranzycje zarówno hiszpańskich, jak i polskich studentów nietradycyjnych wpisane są próby pragmatycznego oceniania możliwości i zasobów środowiska w aspekcie przyszłej pracy zawodowej. Są one pewnym wypracowanym schematem działań i indywidualnych ścieżek zgodnie z systemem oczekiwań o charakterze normatywnym. Wyniki badań wskazują, że tranzycje to nie tylko przemieszczanie się pomiędzy różnymi kontekstami instytucjonalnymi i środowiskami uczenia się, ale w dużej mierze jest to ‘stawanie się’ (kimś), a zatem czynniki jednostkowe i sprawstwo mają tu równie duże znaczenie, co zewnętrzne struktury społeczne.
The authors of this article present a part of the study done under the project research EMPLOY which advocates fostering employability of non-traditional students through improving the effectiveness of transition from university to labor market. The article presents partial findings of narrative surveys taking into account the perspective of non-traditional Spanish and Polish students in a comparative manner. The authors while interpreting the findings used mainly the concept of transition in lifelong learning. In the transition of both Spanish and Polish non-traditional students one can identify the attempts to assess pragmatically opportunities and resources of the environment with regard to future employment. These are a certain modus operandi and individual paths based on the expectation system of normative nature. The findings indicate that transitions do not exclusively refer to relocation between dif-ferent institutional contexts and learning environments but largely they mean ‘becoming’ (someone), therefore individual factors and perpetration play as important role as external social structures.

Źródło:

Dyskursy Młodych Andragogów; 2017, 18; 9-18
2084-2740

Pojawia się w:

Dyskursy Młodych Andragogów

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

High-Pressure Phase Transitions and Thermodynamic Behaviors of Cadmium Sulfide

Autorzy:

Tan, J.
Li, Y.
Ji, G.

Powiązania:

https://bibliotekanauki.pl/articles/1493632.pdf

Data publikacji:

2011-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.15.Mb
65.40.-b

Opis:

The pressure-induced phase transitions of cadmium sulfide semiconductor in both zinc-blende and wurtzite structures are investigated by ab initio plane-wave pseudopotential density functional theory with the local density approximation. On the basis of the fourth-order Birch-Murnaghan equation of state, the phase transition pressures $P_{t}$ are determined by the enthalpy criterion. It is found that the phase transitions occur at pressure of 2.57 GPa (zinc blende-rocksalt structure) and 2.60 GPa (wurtzite-rocksalt structure), respectively. The equilibrium structural parameters, elastic constants, and phase transition pressures are calculated and compared with the experimental data available and other theoretical results. According to linear-response approach, the thermodynamic properties such as the free energy, enthalpy, entropy, and heat capacity are also obtained successfully from the phonon density of state.

Źródło:

Acta Physica Polonica A; 2011, 120, 3; 501-506
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:

Infrared Absorption of Multiple Quantum Wells: Bound to Continuum Transitions

Autorzy:

Oszwałdowski, R.
Jaskólski, W.

Powiązania:

https://bibliotekanauki.pl/articles/1992054.pdf

Data publikacji:

1998-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.20.Dx
78.66.-w
85.30.Vw

Opis:

Optical transitions between bound and continuum states in multiple-heterojunction quantum structures are numerically investigated. In the conduction band energy range the absorption to continuum is studied within one-band effective-mass approximation. By changing the shape of quantum wells, we can tune the energy corresponding to absorption peak. We also show how the absorption is modified in the case of annealed structures. The inter-subband transitions in the energy range of valence band in Si/Si$\text{}_{1-x}$Ge$\text{}_{x}$/Si quantum well are described with the help of multiband Luttinger-Kohn Hamiltonian. Particular attention is paid to transitions to resonant states.

Źródło:

Acta Physica Polonica A; 1998, 94, 3; 473-478
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:

Pressure Dependence of the Raman Modes Related to the Phase Transitions in Cyclohexane

Autorzy:

Yurtseven, H.
Cebeci, A.

Powiązania:

https://bibliotekanauki.pl/articles/1398881.pdf

Data publikacji:

2015-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

63.70.+h
64.70.Dv

Opis:

The pressure dependence of the Raman frequencies for the $ν_{21}$ mode is studied by using the volume data at room temperature close to the transitions among the phases of III, IV and V in cyclohexane. By determining the pressure dependence of the mode Grüneisen parameter $γ_{T}$ in the phases and taking the average values, the Raman frequencies of those modes associated with the phase transitions are predicted through the volume data in cyclohexane. Our predicted Raman frequencies agree with those observed experimentally in this organic molecule. The Raman frequencies of the other modes can be calculated in cyclohexane and also in some molecular crystals using the method given here.

Źródło:

Acta Physica Polonica A; 2015, 127, 3; 744-747
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:

Minimization of finite state machines by states merging

Autorzy:

Salauyou, V.

Powiązania:

https://bibliotekanauki.pl/articles/114664.pdf

Data publikacji:

2016

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

finite state machine
minimization
state merging
FSM transitions
FSM input variables
digital systems

Opis:

The paper presents a method for minimization of finite state machines (FSMs) with unspecified values of output variables. The proposed method is based on merging of two states. In addition to reduction of the FSM states, the method also allows reducing the number of FSM transitions and FSM input variables. This method enables reducing the number of internal states of the initial FSM by 1.22 times on the average, and by 2.75 times on occasion. An average reduction of the number of FSM transitions makes up 1.32 times, and on occasion may amount to 2.27 times. The comparison of the method with the program STAMINA shows that the offered method allows decreasing the number of FSM transitions by 1.55 times on the average, and by 3.92 times on occasion.

Źródło:

Measurement Automation Monitoring; 2016, 62, 5; 179-181
2450-2855

Pojawia się w:

Measurement Automation Monitoring

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Kinetics of Non-Radiative Rotational Isomer Butane Transitions

Autorzy:

Keković, G.
Raković, D.
Davidović, D.

Powiązania:

https://bibliotekanauki.pl/articles/1808049.pdf

Data publikacji:

2009-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

82.20.Bc
82.20.Ln
82.20.Pm

Opis:

A theoretical model for calculation of equilibrium concentrations of isomeric butane molecule forms, and also the forms of hydrocarbons of the alkene series, is proposed. We considered the changes of internal rotational potential energy in respect of reaction coordinate, of rapid conversion of butane isomers from one form to another at room temperature. This is very important for better understanding of the nature of chemical reactions in butane, because the changes of internal rotational potential energy reflect conformational transitions of butane and changes of its chemical and physical properties. The presented model is based on Gribov's system of kinetic equations for isomer-isomer transitions. The canonical ensemble is used to calculate the room temperature probabilities of the rotoisomer conformational states as functions of dihedrial angle, and the obtained results are in good agreement with available ones. Also, in a sense of calculated lifetime of unstable rotoisomers (<$10^{-10}$ s), our results are comparable with coupled cluster and density functional calculations on alkene derivatives.

Źródło:

Acta Physica Polonica A; 2009, 115, 4; 775-777
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:

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: 51.

Tytuł:

On the Phase Transitions in Cs$\text{}_{2}$CdBr$\text{}_{4}$: Dielectric, Dilatometric and Optical Studies

Autorzy:

Dacko, S.
Czapla, Z.

Powiązania:

https://bibliotekanauki.pl/articles/2035738.pdf

Data publikacji:

2003-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

77.80.Bh

Opis:

Dielectric, dilatometric measurement and polarized microscopic observation were performed for single crystal of Cs$\text{}_{2}$CdBr$\text{}_{4}$. These investigations showed clearly the phase transitions at 252 K, 236 K and 153 K. The jump-like change of the crystal volume corresponding to the first-order phase transition was found at temperature of 236 K. Ferroelastic domain structure was observed along the a-axis below 236 K and it is preserved below the transition at 153 K. Observation along the c-axis revealed new domain structure below 153 K.

Źródło:

Acta Physica Polonica A; 2003, 103, 4; 387-392
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Specifics of demographic transitions in Ukraine after the country gained independence

Autorzy:

Radczenko, Oleksandr
Michalski, Tomasz

Powiązania:

https://bibliotekanauki.pl/articles/1201722.pdf

Data publikacji:

2015-09-15

Wydawca:

Uniwersytet Gdański. Instytut Geografii

Tematy:

demographic transition model
second demographic transition model
demography
Ukraine

Opis:

Demographic transition processes in Ukraine following the country gaining independence correspond neither to the demographic transition model nor the second demographic transition model. Unsuccessful political, social and economic reforms at the time in Ukraine and pressure exerted by Russia are deemed to be the cause of the situation. This means that demographic transition in Ukraine (both in terms of mortality and births) is far more detrimental than the premises of both models.

Źródło:

Journal of Geography, Politics and Society; 2015, 5, 1; 32-36
2084-0497
2451-2249

Pojawia się w:

Journal of Geography, Politics and Society

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Electron-deformational phase transitions in a TlGaSe₂ layered crystal

Autorzy:

Kharkhalis, L.
Glukhov, K.
Sznajder, M.

Powiązania:

https://bibliotekanauki.pl/articles/1157770.pdf

Data publikacji:

2016-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.15.Mb
71.20.Nr
71.38.-k

Opis:

We investigate the self-consistent localized electron states which are related to charge carrier inhomogeneities in a TlGaSe₂ crystal, in the framework of the continuum and the deformational potential approaches. For this purpose a nonstandard dispersion law for charge carriers following from the ab initio band structure calculation of the considered crystal is utilized. It is shown that a formation of stable localized electron states with different bond energy, which are separated by the potential barrier, takes place. These states can be responsible for the occurrence of the deformational phase transition in the presence of the non-equilibrium charge carriers in TlGaSe₂.

Źródło:

Acta Physica Polonica A; 2016, 129, 1a; A-123-A-125
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:

Bound-to-Continuum Transitions in Quantum Well with Capping Barrier Layer of Finite Size

Autorzy:

Nalewajko, C.
Załużny, M.

Powiązania:

https://bibliotekanauki.pl/articles/1968359.pdf

Data publikacji:

1997-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.30.Fs
73.20.Dx

Opis:

It was shown employing the functional density approach that interference effects resulting from finite size of the cap layer can modify substantially the absorption line shape connected with bound-to-continuum intraband transitions in quantum wells.

Źródło:

Acta Physica Polonica A; 1997, 92, 5; 908-910
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:

Phase Transitions in Optical Lattices at Finite Temperatures

Autorzy:

Polak, T.
Kopeć, T.

Powiązania:

https://bibliotekanauki.pl/articles/1810621.pdf

Data publikacji:

2009-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.30.Jp
03.75.Lm
03.75.Nt
67.40.Kh

Opis:

We discuss the finite-temperature phase diagram in three-dimensional Bose-Hubbard model relevant for the Bose-Einstein condensates in optical lattices, by employing U(1) quantum rotor approach and the topologically constrained path integral, that includes a summation over U(1) topological charge. The effective action formalism allows us to formulate a problem in the phase only action and obtain analytical formulae for the critical lines beyond mean-field theory.

Źródło:

Acta Physica Polonica A; 2009, 115, 1; 418-420
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:

Phase Transitions in Fe-Rh Alloys Induced by Temperature

Autorzy:

Rodionov, V.
Rodionova, V.
Annaorazov, M.

Powiązania:

https://bibliotekanauki.pl/articles/1386516.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

64.60.Cn
75.30.Kz
64.70.K-

Opis:

This research work was aimed to find the composition of equiatomic Fe-Rh alloy and to find the way of preparation of samples with extremely narrow thermal hysteresis and repeatable results. Alloys with content of Fe from 48 up to 52 at.% were examined. Fe-Rh alloys were prepared in forms of bulk piece, plate and wire. The plates of alloys were found to be more perspective for further investigations. The influence of parameters of ingot and samples treatments on antiferromagnetic-ferromagnetic transition was studied. The ways of narrowing of temperature hysteresis were established.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 445-447
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:

Spin-Flip Transitions in Tunneling through a Quantum Dot Coupled to Ferromagnetic Electrodes

Autorzy:

Rudziński, W.

Powiązania:

https://bibliotekanauki.pl/articles/1810526.pdf

Data publikacji:

2009-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.25.Mk
73.63.Kv
73.23.Hk

Opis:

Using nonequilibrium Green function formalism the spin-polarized electronic transport through a quantum dot coupled to ferromagnetic electrodes is studied. Arbitrary Coulomb correlations and spin-flip processes are considered in the dot, for both parallel and antiparallel magnetic configurations of the junction. It is found that spin-flip processes suppress the magnetoresistance between each pair of the threshold bias voltages, thus giving rise to sharp tunnel magnetoresistance maxima at the thresholds. The origin of additional steps in the electric current, splitting of the resonance peaks in the corresponding differential conductance as well as negative differential conductance is also discussed in the context of interplay between tunneling processes and the intradot spin-flip transitions.

Źródło:

Acta Physica Polonica A; 2009, 115, 1; 281-283
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 58.

Tytuł:

Inductive-Resonant Theory of Nonradiative Transitions for Complex Organic Molecules in Condensed Phase

Autorzy:

Ermolaev, V. L.
Sveshnikova, E. B.

Powiązania:

https://bibliotekanauki.pl/articles/1995259.pdf

Data publikacji:

1999-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

33.50.Dq
78.30.Jw

Opis:

Ours and literature data on influence of replacement of deuterium by protium in complex organic molecules on nonradiative triplet-singlet transition rates are discussed from the standpoint of the inductive-resonant theory of this process. It has been shown that the extent to which the protium introduction in molecule affects the nonradiative rate depends on distance between protium atom and the vibronic molecular oscillator of triplet-singlet transition and on π -electronic density near-by protium.

Źródło:

Acta Physica Polonica A; 1999, 95, 3; 299-308
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 59.

Tytuł:

Phase Transitions in Magnetic and Superconducting Systems with Fluctuating Valence. Chemical Potential Evidence

Autorzy:

Gosławska, E.
Matlak, M.
Eid, Kh.

Powiązania:

https://bibliotekanauki.pl/articles/2013336.pdf

Data publikacji:

2000-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.30.Kz
75.40.Cx

Opis:

We investigate the critical behaviour of the chemical potential and average occupation numbers using the extended s -f model with intersite Cooper pairing for systems with fluctuating valence. The model is able to describe phase transitions from normal ferromagnet to normal paramagnet at $T=T_{C}$, from superconducting paramagnet to normal paramagnet at $T=T_{S}$, as well as reentrant phase transitions with three critical temperatures $T_{S_{1}}, T_{C}$ and $T_{S_{2}} (T_{S_{1}} < T_{C} < T_{S_{2}})$. Present investigation, as well as recent results obtained for another models suggest one-to-one correspondence between critical temperatures of the system and kinks appearing in the temperature dependence of the chemical potential and average occupation numbers. This, in turn, indicates a possibility to apply the measurement of the chemical potential vs. temperature as an experimental universal tool when looking for phase transitions in solids.

Źródło:

Acta Physica Polonica A; 2000, 97, 4; 713-718
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 60.

Tytuł:

Optical and Dilatometric Manifestations of Phase Transitions in K$\text{}_{2}$SeO$\text{}_{4}$ Crystal

Autorzy:

Andriyevsky, B.
Myshchyshyn, O.

Powiązania:

https://bibliotekanauki.pl/articles/1967887.pdf

Data publikacji:

1997-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Fm
64.70.Kb

Opis:

Temperature dependencies of the characteristic optical paths difference D(Τ) of K2SeO4 crystal in the range of 80-295 K were measured using the Jamen type interferometer. Significant anomalies of D(Τ) dependencies in the vicinity of incommensurate-paraelectric phase transition (T$\text{}_{i}$ = 130 K) are observed. On the basis of D(Τ) temperature dependencies measured experimentally and linear expansion l(Τ) known, the temperature derivative of the refractive indices dn/dT are found to be negative in the ranges above and below the temperature T$\text{}_{i}$=130 K.

Źródło:

Acta Physica Polonica A; 1997, 92, 3; 557-562
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 61.

Tytuł:

Kalorymetria skaningowa w badaniu przejść fazowych fosfolipidów i białek
Differential scanning calorimetry in studies of phase transitions in phospholipids and proteins

Autorzy:

Bryszewska, Maria
Pałecz, Bartłomiej

Powiązania:

https://bibliotekanauki.pl/articles/945001.pdf

Data publikacji:

1994

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Opis:

There is a brief review of the results on the thermotropic phase transitions in lipids and proteins obtained by the differential scanning calorimetry. The article gives the description of the technique itself as well as brings the most significant calorimetric data important for understanding of the biological structures organization.

Źródło:

Acta Universitatis Lodziensis. Folia Biochimica et Biophysica; 1994, 10
0208-614X

Pojawia się w:

Acta Universitatis Lodziensis. Folia Biochimica et Biophysica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 62.

Tytuł:

Quantum Phase Transitions in the Kitaev-Heisenberg Model on a Single Hexagon

Autorzy:

Gotfryd, D.
Oleś, A.

Powiązania:

https://bibliotekanauki.pl/articles/1385471.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.Jm
75.25.Dk
75.30.Et

Opis:

We present a detailed analysis of the Kitaev-Heisenberg model on a single hexagon. The energy spectra and spin-spin correlations obtained using exact diagonalisation indicate quantum phase transitions between antiferromagnetic and anisotropic spin correlations when the Kitaev interactions increase. In cluster mean-field approach frustrated nearest neighbor exchange stabilizes the stripe phase in between the Néel phase and frustrated one which evolves towards the Kitaev spin liquid.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 318-320
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Circling the square: Governance of the circular economy transition in the Amsterdam Metropolitan Area

Autorzy:

Heurkens, Erwin
Dąbrowski, Marcin

Powiązania:

https://bibliotekanauki.pl/articles/1019565.pdf

Data publikacji:

2020-12-30

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

circular economy
transitions
urban regions
governance
sustainability
planning

Opis:

Circular economy (CE), the new ‘buzzword’ in urban and regional studies and policy debates, is about shifting from a linear production process towards a circular one in which the generation of waste is minimised, materials circulate in ‘closed loops’, and waste is not considered a burden but rather a resource that brings new economic opportunities. However, while there is a consensus on the need to facilitate a transition towards a circular economy, the governing of this endeavour remains extremely challenging because making a circular economy work requires cutting across sectoral, scalar, and administrative boundaries. Drawing on the sustainability transitions literature and the case of the Amsterdam Metropolitan Area, arguably one of the frontrunners on the strive towards a circular built environment and economy, the paper seeks to identify and understand barriers for CE transition at a regional scale. The findings underscore the multi-faceted nature of the challenge and offer lessons for the governance of emerging regional circular spatial-economic policies.

Źródło:

European Spatial Research and Policy; 2020, 27, 2; 11-31
1231-1952
1896-1525

Pojawia się w:

European Spatial Research and Policy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Identity and markers of adulthood: the relationship between two constructs

Autorzy:

Brzezińska, Anna Izabela
Piotrowski, Konrad

Powiązania:

https://bibliotekanauki.pl/articles/430424.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

commitment
exploration
identity formation
psychosocial maturity
role transitions
sense of adulthood

Opis:

The article presents both the classical and contemporary approaches to the analysis of identity formation. Special emphasis has been placed on the processual approach, in which identity is regarded as a dynamic construct that remains in constant, mutual relations with personal and contextual factors. Since research on identity has been predominantly based on studies conducted on individuals in adolescence and early adulthood, i.e. in the time of transition to adulthood, the article focuses on adulthood markers that may be found in this particular phase of human development. The authors have distinguished different markers of adulthood (transitions to adult roles, psychosocial maturity, sense of adulthood) and have described their links to identity. In the conclusion of the present paper, it has been stressed that future research on identity should to a large extent include factors originating from these different categories of conditions, and that researchers ought to consider the interactions of these factors as predictors of identity formation.

Źródło:

Polish Psychological Bulletin; 2013, 44, 3; 254-265
0079-2993

Pojawia się w:

Polish Psychological Bulletin

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Temperature-dependent Shock Initiation of CL-20-based High Explosives

Autorzy:

Pi, Z.
Chen, L.
Wu, J.

Powiązania:

https://bibliotekanauki.pl/articles/358764.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

CL-20
shock initiation
heated explosive
phase transitions
numerical simulation

Opis:

To investigate the effects of temperature on the shock initiation characteristics of hexanitrohexaazaisowurtzitane (CL-20), shock initiation experiments on heated C-1 explosive (94% epsilon phase CL-20, and 6% binder, by weight) were performed at temperatures of 20 °C, 48 °C, 75 °C, 95 °C, 125 °C, 142 °C, and 175 °C. An explosive driven flyer device was used to initiate the C-1 charges and manganin pressure gauges were embedded in the C-1 specimen to record the pressure changes with time. Our results show that C-1 becomes more sensitive as the temperature is increased from 20 °C to 95 °C. The ε to γ phase transition in CL-20 occurs at 125 °C; C-1 with CL-20 in the γ phase at 142 °C is less shock sensitive than C-1 with CL-20 in the ε phase at 95 °C or 75 °C. Compared with C-1 at 142 °C, C-1 at 175 °C shows a dramatic increase in shock sensitivity. An ignition and growth reactive flow model was used to simulate the shock initiation of C-1 at various temperatures, and the parameters were obtained by fitting the experimental data. With this parameter set, the shock initiation characteristics of C-1 for temperatures between 20 °C and 175 °C can be derived.

Źródło:

Central European Journal of Energetic Materials; 2017, 14, 2; 361-374
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Reentrant Transitions of Ising-Heisenberg Ferromagnet on a Triangular Lattice with Diamond-Like Decorations

Autorzy:

Jaščur, M.
Strečka, J.
Čanová, L.

Powiązania:

https://bibliotekanauki.pl/articles/1813798.pdf

Data publikacji:

2008-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.50.+q
68.35.Rh

Opis:

The mixed spin-1/2 and spin-1 Ising-Heisenberg ferromagnet on the decorated triangular lattice consisting of inter-connected diamonds is investigated within the framework of an exact decoration-iteration mapping transformation. It is shown that the diamond-like decoration by a couple of the Heisenberg spins gives rise to a diverse critical behaviour including reentrant phase transitions with two consecutive critical points.

Źródło:

Acta Physica Polonica A; 2008, 113, 1; 453-456
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:

Investigation of HM-network with priority messages and depending on time incomes from transitions between its states

Autorzy:

Kiturko, O.
Matalytski, M.

Powiązania:

https://bibliotekanauki.pl/articles/122831.pdf

Data publikacji:

2013

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

HM-network
incomes
priority messages

Opis:

In the article the technique of finding the expected income in multipleline queueing systems closed exponential by HM-network with priority messages in a case when the income from transitions between its states is random variables with known average values is described. The intensity of the service of messages in systems linearly depends on their number. The approached expressions for the expected income, depending on the average numbers of messages in systems are received. For them the system of the linear differential equations with broken right parts is made. The example is calculated.

Źródło:

Journal of Applied Mathematics and Computational Mechanics; 2013, 12, 4; 67-76
2299-9965

Pojawia się w:

Journal of Applied Mathematics and Computational Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Multifractality in Fock Space of the Ground State of the Bose-Hubbard Hamiltonian

Autorzy:

Lindinger, J.
Rodríguez, A.

Powiązania:

https://bibliotekanauki.pl/articles/1030013.pdf

Data publikacji:

2017-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

multifractality
localisation in Fock space
quantum phase transitions

Opis:

We present a first study of the multifractal properties of the ground state of the Bose-Hubbard Hamiltonian in Fock space. Numerical simulations of system sizes up to L=10 at unit filling suggest that multifractality is present for all values of the bosonic interaction strength. Moreover, the analysis of the generalised fractal dimensions for different densities exposes qualitatively the superfluid to Mott insulator phase transition.

Źródło:

Acta Physica Polonica A; 2017, 132, 6; 1683-1687
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:

Pressure Induced Transitions in Heavy-Fermion Systems footnotemark

Autorzy:

Zhang, Sun
Dong, Yi-Qiao

Powiązania:

https://bibliotekanauki.pl/articles/1401900.pdf

Data publikacji:

2015-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.30.Mb
75.20.Hr
71.28.+d
74.62.Fj

Opis:

In this paper, the electron-type heavy-fermion system and the hole-type heavy-fermion system are classified by means of the cell-volume difference between two typical valence states of f ions. Two kinds of transitions induced by pressure are studied theoretically within a unified picture presented for both two types of heavy-fermion systems. Among these transitions, the incoherence-to-coherence transition in the electron-type heavy-fermion system is confirmed intensively in experiments, while the coherence-to-incoherence transition in the hole-type heavy-fermion system is discussed as a prediction for further observations.

Źródło:

Acta Physica Polonica A; 2015, 128, 3; 389-393
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:

A Microscopic Approach for THz Intersubband Challenges

Autorzy:

Pereira, M. F.

Powiązania:

https://bibliotekanauki.pl/articles/308177.pdf

Data publikacji:

2009

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

band structure engineering
coupled valence bands
intersubband laser
intersubband transitions
lasing without inversion
terahertz radiation

Opis:

The main candidate to be a practical and low cost high power THz source is the intersubband-based quantum cascade laser, which can have a tremendous impact in many practical applications, including last mile and indoor telecommunication systems. In this review we discuss current challenges for THz intersubband device development from a microscopic point of view. Next summarize the search for new mechanisms and structure designs that can lead to intersubband gain without population inversion. This is a very important topic of current research, since is both an extremely elegant phenomenon from the basic physics of view and crucial for effective lasing in the THz range. The reason is that scattering phenomena can lead to level broadenings of the same order of magnitude of the lasing transitions, making population inversion by carrier injection in upper lasing subbands extremely difficult. Previous work in the literature is compared and contrasted with a new scheme that may lead to high temperature lasing by engineering the nonequilibrium population inversion with a combination of band structure and many body effects mediated by a k-space filter.

Źródło:

Journal of Telecommunications and Information Technology; 2009, 4; 118-123
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 71.

Tytuł:

Wyspowy diagram fazowy dla nanokryształów
Island phase diagram for nanocrystals

Autorzy:

Tomaszewski, Paweł E.

Powiązania:

https://bibliotekanauki.pl/articles/2086737.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Chemiczne

Tematy:

diagram fazowy
nanokryształy
przemiany fazowe
krzemiany
phase diagram
nanocrystals
phase transitions
silicates

Opis:

The new form of the phase diagram is proposed for nanocrystals. This diagram shows the regions of the calcination temperature required to obtain the nanocrystals of given range of crystallite size. This explains why the temperature induced phase transitions are not possible in some crystals. However, the change of crystallite size can induce the phase transition.

Źródło:

Wiadomości Chemiczne; 2022, 76, 3-4; 145--155
0043-5104
2300-0295

Pojawia się w:

Wiadomości Chemiczne

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 72.

Tytuł:

Optical Investigations of Phase Transitions in (NH$\text{}_{4}$)$\text{}_{2}$SbF$\text{}_{5}$ Crystal

Autorzy:

Andriyevsky, B.
Czapla, Z.
Stadnyk, V.

Powiązania:

https://bibliotekanauki.pl/articles/1932114.pdf

Data publikacji:

1995-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

64.70.Kb
78.20.Fm

Opis:

Results of optical thickness and refractive indices measurements for (NH$\text{}_{4}$)$\text{}_{2}$SbF$\text{}_{5}$ crystal in the temperature range 100-310 K are presented. The measurements were done with interference method using He-Ne laser (λ = 632.8 nm). At T$\text{}_{c1}$ = 292 K and T$\text{}_{C2}$ = 168 K two continuous phase transitions with critical indices β$\text{}_{1}$ = 0.38 and β$\text{}_{2}$ ≤ 0.57 were observed. Additional anomaly of temperature changes of interference order with maximum at T$\text{}_{c3}$ ≈ 132 K were found. This anomaly resembles a diffused transition. Temperature-averaged values of derivatives of refractive indices dn$\text{}_{g}$ /dT = -3.3 × 10$\text{}^{-5}$ K and dn$\text{}_{m}$/dT = -2.9 × 10$\text{}^{-5}$ K$\text{}^{-1}$ evidenced a decrease in optical anisotropy (birefringence) along the b-axis on heating run.

Źródło:

Acta Physica Polonica A; 1995, 87, 3; 611-617
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:

Transition Probabilities and Oscillator Strengths for E1 Transitions of Ce III

Autorzy:

Karaçoban Usta, B.

Powiązania:

https://bibliotekanauki.pl/articles/1189932.pdf

Data publikacji:

2015-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

31.15.ag
31.15.aj
31.30.-i
32.70.Cs

Opis:

We report calculations of wavelengths, oscillator strengths, and transition probabilities (or rates) for electric dipole (E1) transitions in doubly ionized cerium (Ce III, Z=58), using the relativistic Hartree-Fock method developed by Cowan. Comparisons are made with the previously reported available calculations and experiments in literature.

Źródło:

Acta Physica Polonica A; 2015, 127, 6; 1605-1615
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

Energy Levels and Spectral Lines for n=3 to n=3 Transitions in Mg-Like Tungsten Ions

Autorzy:

Hao, L.
Kang, X.

Powiązania:

https://bibliotekanauki.pl/articles/1401868.pdf

Data publikacji:

2015-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

31.30.Gs
32.30.-r

Opis:

Energies and transitions for allowed (E1) and forbidden (E2, M1, and M2) lines for low-lying configurations in magnesium-like tungsten $(W^{62+})$ are studied using the multiconfiguration Dirac-Hartree-Fock approach. It is shown that the correlations within the n=3 complex, quantum electrodynamic and Breit effects are very important for the calculation of fine structure energies. The present results are compared to and agree very well with other theoretical energies, wavelengths, transition probabilities and line strengths previously published for a few lines, and are generally found to be more reliable than previous theoretical predictions. The data for E2, M1, and M2 for transitions between the levels are presented as supplemental material. Results are also compared with other theory, when available.

Źródło:

Acta Physica Polonica A; 2015, 128, 3; 274-282
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Near poverty – definition, factors, predictions
Sfera blisko ubóstwa – definicja, czynniki, prognozy

Autorzy:

Sączewska-Piotrowska, Anna

Powiązania:

https://bibliotekanauki.pl/articles/424841.pdf

Data publikacji:

2016

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

near poverty
poverty transitions
the Markov chain model
Shorrocks' mobility index
logistic regression

Opis:

The aim of the paper was to analyse near poverty in Poland. The first specific aim was to analyse the transitions into and out of near poverty in Poland using the Markov transition matrix. Three poverty states were considered: poverty, near poverty (an income of between 100 and 125 per cent of the poverty threshold is assumed in the paper) and above near poverty. The analysis was conducted for Poland based on the balanced panel from 2009 to 2015, the framework of the “Social Diagnosis” project. The second specific aim was to determine the factors that increase and decrease the odds of being in near poverty using bi-nomial logistic regression.

Źródło:

Econometrics. Ekonometria. Advances in Applied Data Analytics; 2016, 4 (54); 82-94
1507-3866

Pojawia się w:

Econometrics. Ekonometria. Advances in Applied Data Analytics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 76.

Tytuł:

Magnetophotoconductivity Due to Intra-Shallow-Donor Transitions in Semi-Insulating GaAs

Autorzy:

Karpierz, K.
Sadowski, M. L.
Grynberg, M.

Powiązania:

https://bibliotekanauki.pl/articles/1890653.pdf

Data publikacji:

1991-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.40.+w
78.20.Ls
78.50.-w

Opis:

The paper concerns investigations of shallow centres in semi-insulating (SI) GaAs samples. A very sensitive measuring method - magnetophotoconductivity due to intra-shallow-donor transitions - was used. We report the behaviour of intra-impurity transitions as well as an additional structure in low magnetic fields for different far-infrared wavelengths (70.6 μm, 96.5 μm, 118.8 μm, 163 µm). The results are discussed in terms of a fluctuating potential from ionized centres in SI GaAs. The physical mechanism responsible for the low magnetic field structure is proposed.

Źródło:

Acta Physica Polonica A; 1991, 80, 2; 291-294
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:

The Influence of Mo Content on Phase Transformation in Ti-Mo Alloys

Autorzy:

Sochacka, P.
Miklaszewski, A.
Jurczyk, M.

Powiązania:

https://bibliotekanauki.pl/articles/351258.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

titanium
molybdenum
biomaterials
mechanical alloying
phase transitions α-β

Opis:

Titanium β-type alloys are a class of interesting biomaterials that can exhibit a unique combination of mechanical as well as physicochemical and biological properties. The aim of this study is to develop a titanium-molybdenum alloys (Ti-x at % Mo, x = 15 and 23). These materials were prepared by the combination of mechanical alloying and powder metallurgical process. The details of the processing method were presented. The samples were characterized by X-ray diffraction, scanning electron micros-copy, chemical composition determination as well as density and Vickers microhardness measurements. The corrosion behaviour in Ringer solution was investigated, too. The crystallization of the obtained material upon annealing led to the formation of a near single β type alloys. The molybdenum content in titanium and heat treatment parameters of a nearly amorphous phase allow to synthesize Ti(β)-type alloys. The present study has demonstrated that Ti23Mo alloy can be the next generation of biomaterial for bone tissue engineering.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 4; 2051-2056
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 78.

Tytuł:

Properties of the $K_{α}$ X-Ray Transitions in Highly Ionized Chlorine

Autorzy:

Jiang, C.
Hu, F.
Zang, Y.
Jiang, G.

Powiązania:

https://bibliotekanauki.pl/articles/1204977.pdf

Data publikacji:

2014-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

31.15.V-
31.30.jc

Opis:

Relativistic configuration interaction calculations with the inclusion of the Breit interaction, quantum electrodynamics and finite nuclear mass corrections have been carried out in the extended optimal level scheme using multi-configuration Dirac-Fock wave functions on the wavelengths, electric dipole transition rates and oscillator strengths of chlorine. Through the use of the active space method, the calculated values are compared with the other available data on He-like and Be-like chlorine and are found to be in very good agreement with them. In this paper we give accurate transition properties from Cl(VIII) through Cl(XVI). These data provide reference value for level lifetime, charge state distribution and average charge of chlorine plasma.

Źródło:

Acta Physica Polonica A; 2014, 126, 3; 694-699
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:

Magnetotransmission Measurements of Intra-Shallow-Donor Transitions in Semi-Insulating GaAs

Autorzy:

Karpierz, K.
Kożuchowski, K.
Grynberg, M.

Powiązania:

https://bibliotekanauki.pl/articles/1920976.pdf

Data publikacji:

1992-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.40.+w
78.20.Ls
78.50.Ge

Opis:

In this paper we present the results of an investigation of the 1s-2p$\text{}_{+}$ intra-shallow-donor transition by means of an extremely difficult magnetotransmission experiment performed on semi-insulating GaAs. We report the temperature dependence of the transition intensity. We noticed the absence in the absorbance spectra of a well-pronounced structure which is observed at low magnetic fields in photoconductivity measurements. The results are discussed in terms of a fluctuating potential from ionized centres in semi-insulating GaAs.

Źródło:

Acta Physica Polonica A; 1992, 82, 4; 617-619
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:

Stark Width Measurements of Neutral Argon Lines and Comparison with Analogous Transitions for Homologous Atoms

Autorzy:

Musielok, J.

Powiązania:

https://bibliotekanauki.pl/articles/1931551.pdf

Data publikacji:

1994-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

32.70.-n
32.70.Jz
52.25.Rv

Opis:

Half widths of 24 ArI lines from a wide interval of the spectrum and from a large range of excitation energies were measured. A wall-stabilized arc at atmospheric pressure was applied as a plasma generator. Electron densities of the plasma of the order of 10$\text{}^{16}$-10$\text{}^{17}$ cm$\text{}^{-3}$ were obtained on the basis of hydrogen H$\text{}_{β}$ line broadening measurements. The measured widths of ArI lines, normalized to au electron density of 10$\text{}^{16}$ cm$\text{}^{-3}$ were compared with experimental data for analogous transitions in other noble atoms.

Źródło:

Acta Physica Polonica A; 1994, 86, 3; 315-326
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 81.

Tytuł:

Chemical Potential Evidence for Phase Transitions in Magnetic and Superconducting Compounds and Alloys

Autorzy:

Matlak, M.
Pietruszka, M.

Powiązania:

https://bibliotekanauki.pl/articles/2012914.pdf

Data publikacji:

2000-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

74.70.-b
75.30.Kz
75.40.Cx

Opis:

We announce that all phase transitions (induced by temperature or concentration) including structural ones and transitions between metastable or "exotic" states can be detected by the chemical potential critical behaviour, as well as, from the average occupation numbers of the electronic system (critical electron redistribution).

Źródło:

Acta Physica Polonica A; 2000, 97, 1; 253-256
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:

Thermal Resistance and Phase Transitions Studies for Some composite Materials Based on Al$\text{}_{2}$O$\text{}_{3}$

Autorzy:

Górski, L.

Powiązania:

https://bibliotekanauki.pl/articles/2011028.pdf

Data publikacji:

1999-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.50.Ks
81.30.-t

Opis:

In this paper the studies of phase transitions in some material compositions based on Al$\text{}_{2}$O$\text{}_{3}$ caused by high-temperature processes are presented. These material compositions may be used to high-temperature resistant plasma sprayed coatings. The occurring phase transitions are studied by X-ray diffraction methods. Phase transitions and thermal resistance for studied oxide systems are different. In the coatings from the materials belonging to Al$\text{}_{2}$O$\text{}_{3}$-NiO and Al$\text{}_{2}$O$\text{}_{3}$- ZrO$\text{}_{2}$ systems complex phase transitions were observed. More resistant to the conditions of thermal fatigue are coatings containing aluminum titanate Al$\text{}_{2}$TiO$\text{}_{5}$ and mullite 3 Al$\text{}_{2}$O$\text{}_{3}$-2 SiO$\text{}_{2}$.

Źródło:

Acta Physica Polonica A; 1999, 96, 2; 275-281
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:

Transitions to Chaos and Chaos Synchronization for Solitons in the Presence of Spatially Inhomogeneous Forces

Autorzy:

Fronczak, P.
Hołyst, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/2030484.pdf

Data publikacji:

2002-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.45.Pq
05.45.Yv

Opis:

Motion of kink solitons in the φ$\text{}^{4}$ model in the presence of external spatially inhomogeneous forces is studied. Depending on the system parameters various routes to chaos, i.e. Feigenbaum's scenario, type-I intermittency, and chaos-chaos intermittency are observed. Synchronization of chaotic solitons is investigated.

Źródło:

Acta Physica Polonica A; 2002, 101, 4; 465-476
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:

Simultaneous Pyroelectric and Dilatometric Studies of Phase Transitions in Triglycine Sulphate and Glycine Posphite Crystals

Autorzy:

Andriyevsky, B.
Kardash, V.
Dacko, S.
Czapla, Z.

Powiązania:

https://bibliotekanauki.pl/articles/2027373.pdf

Data publikacji:

2001-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

77.80.Bh

Opis:

Temperature dependences of the linear dimension L(T) and spontaneous polarization P$\text{}_{s}$(T) for triglycine sulphate and glycine posphite single crystals have been measured in the same run of temperature. A decrease in the spontaneous electrostriction coefficient Q$\text{}_{L}$ of both crystals studied is displayed when approaching the corresponding phase transition point T$\text{}_{c}$. A temperature dependence of the coefficients Q$\text{}_{L}$(T) shows that the rates of temperature changes of displacement of the atomic complexes of corresponding crystal structure forming the square of spontaneous polarization P_s$\text{}^{2}$ (primary order parameter) and the displacements of all atomic complexes forming the spontaneous linear thermal expansionδ L$\text{}_{s}$/L (secondary order parameter) are different. The applying external electric field E=3×10 $\text{}^{5}$ V/m to triglycine sulphate crystal does not influence essentially the temperature dependence of Q$\text{}_{L}$(T) in the temperature range of phase transition below T$\text{}_{c}$.

Źródło:

Acta Physica Polonica A; 2001, 99, 5; 593-600
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:

Der Generationenroman als Figuration historischer Übergänge. Arno Geigers 'Es geht uns gut'
Generational novel as figuration of historical transitions. Arno Geiger’s 'We Are Doing Fine'

Autorzy:

Pokrywka, Rafał

Powiązania:

https://bibliotekanauki.pl/articles/1178828.pdf

Data publikacji:

2013-01-01

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Opis:

Assuming that the contemporary generational novel is a kind of reflection (Widerspiegelung) of historical transitions, which is remarkable first of all on the level of commercial reception (book covers, reviews inter alia), the aim of this essay is to examine the connections between the novel’s presentation of history and history itself. In the first part of the paper the terms of reflection, identity and example are proven useless to describe the problem of presentation of history in one single family’s fate. Its nature is figuration – a metaphorical approach depicted by Erich Auerbach in his Mimesis in respect of the Bible and religious writings up to the Renaissance. The second part of the paper focusses on Auerbach’s and his commentator’s conclusions in order to uncover the figurative potential of the generational novel. Its main figure seems to be the metonymy with the assumption of pars pro toto (a part taken for the whole). Here the family metaphorically reflects the course of history through one part of its possible realizations. It differs though from the former applications by the lack of religious reference. Thus the analysis in crowned by a new “secular” allegorization of historical image in generational novels crowns. 

Źródło:

Studia Germanica Posnaniensia; 2013, 34; 149-161
0137-2467

Pojawia się w:

Studia Germanica Posnaniensia

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 86.

Tytuł:

Sensitivity of Positronium Momentum Distribution to Phase Transitions in Crystalline Dielectrics

Autorzy:

Bondarev, I. V.
Hyodo, T.

Powiązania:

https://bibliotekanauki.pl/articles/2042201.pdf

Data publikacji:

2005-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.70.Bj
71.60.+z
71.38.-k
36.10.Dr

Opis:

We give a review of recent theoretical and experimental study of the positronium-phonon and positronium-quadrupole interactions in dielectric crystals of different local symmetries, placing a special emphasis on the sensitivity of the positronium momentum distribution to the second order phase transitions in crystalline dielectrics.

Źródło:

Acta Physica Polonica A; 2005, 107, 4; 673-684
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:

Lost in Transitions? Biographical Experiences and Life Strategies of Young Precarious Workers in Poland

Autorzy:

Mrozowicki, Adam
Karolak, Mateusz
Krasowska, Agata

Powiązania:

https://bibliotekanauki.pl/articles/1372917.pdf

Data publikacji:

2018-12-28

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Polska
transition
life strategies
young precarious workers
precarisation

Opis:

This article discusses conditions, properties and consequences of life strategies of young people in Poland in the context of the rise of precarious, low paid and uncertain employment. The analysis is developed against the background of the debates about three transitions, to adulthood, flexible and precarious labour market and changing political-economic regime. Based on the tentative analysis of 45 biographical narrative interviews with young people, aged 18–30, in various forms of temporary, low-paid jobs, and unemployed, a typology of coping with the three transitions is proposed, including four types: proletarian, postetatist, projectarian and entrepreneurial. The typology reflects the logics of stories’ told by young people, the desired relationships between the world of work and world outside work, as well as the relevance of resources and reflexivity for the transitions among the types of life strategies in coping with precarity. The authors conclude that the “normalization of precarity,” manifested into the emergence of institutional action schemes which define insecure employment as an expected pattern of occupational careers, encounters its biographical limits within each types. It is suggested that these “gaps and cracks” in the institutionalization of insecurity might represent important sources of young people collective mobilization in various spheres of political and social life despite an overarching individualization of their life strategies.

Źródło:

Kultura i Społeczeństwo; 2018, 62, 4; 69-89
2300-195X

Pojawia się w:

Kultura i Społeczeństwo

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 88.

Tytuł:

Phase Transitions of Bosons in Optical Lattices with a Mixture of Single and Pair Hoppings

Autorzy:

Travin, V.
Kopeć, T.

Powiązania:

https://bibliotekanauki.pl/articles/1398644.pdf

Data publikacji:

2016-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

67.10.Fj
67.85.Hj
67.90.+z

Opis:

We considered Bose condensate in optical lattice with mixture of single and pair hoppings for arbitrary temperatures. In order to calculate free energy of the system and determine phase transition lines between disordered and ordered phases, the Laplace transform method has been applied. We identified several possible scenarios for phase diagrams with phase transitions of the second kind. The results have been obtained from both analytical and numerical methods of calculation. Finally, we obtained thermal insensitivity of the system for big values of reduced pair hopping and (or) reduced chemical potential.

Źródło:

Acta Physica Polonica A; 2016, 130, 2; 625-628
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 89.

Tytuł:

Effect of ethanol on structural transitions of DNA and polyphosphates under Ca2+ ions action in mixed solutions.

Autorzy:

Hackl, Elene
Blagoi, Yurij

Powiązania:

https://bibliotekanauki.pl/articles/1044400.pdf

Data publikacji:

2000

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

DNA transition
ethanol effect
polyphosphates

Opis:

In the present work using the IR spectroscopy method the effect of ethanol on structural transitions of DNA and polyphosphates under the action of Ca2+ ions in mixed solutions containing ethanol (0-25 vol.%) was studied. It was shown that, on its interaction with Ca2+ ions, in aqueous and mixed solutions DNA becomes transformed into compact form. With the increase of concentration of ethanol the degree of Ca2+-induced DNA compactisation rises. It was found that, in mixed solutions containing ethanol, Ca2+-induced DNA compactisation depends not only on the solution's dielectric permeability but also on the solution structure. On stabilisation of the water structure in the presence of low ethanol concentrations a stabilisation of the DNA macromolecule occurs that leads to the increase of the Ca2+ ion concentration necessary for DNA compactisation. Comparison of the effects of ethanol on Ca2+-induced structural transitions in DNA and polyphosphates in mixed solvents permits to suppose that at alcohol concentrations in solution resulting in disruption of the water spatial structure, some peculiarities are observed in the behavior of those molecules whose hydrophobic interactions are essential.

Źródło:

Acta Biochimica Polonica; 2000, 47, 1; 103-112
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

Magnetic Phase Transitions and Thermal Properties of $Ho(Co_{1-x}Si_x)_2$ Compounds

Autorzy:

Vasylyev, D.
Prokleška, J.
Sechovský, V.

Powiązania:

https://bibliotekanauki.pl/articles/1813682.pdf

Data publikacji:

2008-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.30.Sg
75.50.Gg

Opis:

The specific heat of $HoCo_2$ and $Ho(Co_{0.95}Si_{0.05})_2$ was measured as a function of temperature in several constant magnetic fields up to 8 T. A data analysis allowed us to determine the isothermal entropy change and the magnetocaloric effect in a wide temperature range. The considerable values of the magnetocaloric effect in the vicinity of the magnetic ordering transition are qualifying both compounds as suitable for magnetic refrigeration purposes. The magnetic phase transition temperature $(T_C)$ increases from 77 K for $HoCo_2$ to 103 K for $Ho(Co_{0.95}Si_{0.05})_2$ while the large magnetocaloric effect in the vicinity of TC is maintained, which demonstrates possible ways of tuning the operating temperatures of the magnetic refrigerant.

Źródło:

Acta Physica Polonica A; 2008, 113, 1; 347-350
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 91.

Tytuł:

Chemical Potential as a Detector of Phase Transitions in Solids

Autorzy:

Matlak, M.
Gosławska, E.
Grabiec, B.
Eid, Kh.

Powiązania:

https://bibliotekanauki.pl/articles/2012963.pdf

Data publikacji:

2000-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

74.70.-b
75.30.Kz
75.40.Cx

Opis:

We show that the chemical potential exhibits small but distinct kinks at all critical temperatures as the evidence for phase transitions in the electronic system, structural phase transitions included. In the case of, at least, two kinds of interacting electrons average occupation numbers exhibit the same behavior.

Źródło:

Acta Physica Polonica A; 2000, 97, 3; 365-368
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 92.

Tytuł:

Phase Transitions in a Coupled Electron and Spin Model on the Shastry-Sutherland Lattice

Autorzy:

Farkašovský, P.
Čenčariková, H.

Powiązania:

https://bibliotekanauki.pl/articles/1366499.pdf

Data publikacji:

2014-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.-b
75.40.Mg
05.70.Fh

Opis:

The thermodynamics of a simple electron-spin model proposed recently for a description of magnetization processes in rare-earth tetraborides is studied numerically by the canonical Monte Carlo method in two-dimensions. The model is based on the coexistence of two subsystems, and namely, the spin subsystem described by the Ising model and the electronic subsystem described by the free-electron model on the Shastry-Sutherland lattice (SSL). Moreover, both subsystems are coupled by the anisotropic spin-dependent interaction of the Ising type. At T=0 the system exhibits the magnetization plateau (MP) at m/$m_s$=1/2, 1/3, 1/5, 1/7, 1/9 and 1/11 of the saturated spin magnetization $m_s$. For the largest phases corresponding to m/$m_s$=0, 1/3 and 1/2 we have examined the nature of the phase transitions from the low-temperature ordered phase (LTOP) to the high-temperature disordered phase (HTDP). It is shown that all phases persist also at finite temperatures (up to the critical temperature $T_c$) and that the phase transition at the critical point is of the second order for the m/$m_s$=0 phase and of the first order for the m/$m_s$=1/3 and 1/2 phases.

Źródło:

Acta Physica Polonica A; 2014, 126, 1; 44-45
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Wpływ zawartości wody na przemiany fazowe mieszanin sacharozy z agarem
Effect of water content on the phase transitions of sucrose mixtures with agar

Autorzy:

Pałacha, Z.
Karaś, M.

Powiązania:

https://bibliotekanauki.pl/articles/228537.pdf

Data publikacji:

2004

Wydawca:

Wyższa Szkoła Menedżerska w Warszawie

Opis:

W pracy określono wpływ stopnia uwodniona sacharozy amorficznej i jej mieszanin z agarem na parametry ich przemian fazowych (temperatura przemiany szklistej, temperatura i ciepło kystalizacji, temperatura i ciepło topnienia). Stwierdzono, że wraz ze wzrostem zawartości wody we wszystkich badanych materiałach, nastąpiło obniżenie temperatury i ciepła krystalizacji oraz temperatury i ciepła topnienia. 1% dodatek agaru wpłynął na opóźnienie procesu krystalizacji sacharozy i spowodował ponad dwukrotny wzrost wartości ciepła topnienia w porównaniu do czystej sacharozy amorficznej.
In the paper the effects of the degree of hydration of amorphous sucrose and its mixtures with agar on the parameters of their phase transitions (glass transition temperature, the temperature and heat of crystallization, melting temperature and heat) were investigated. Increase in water content in all analyzed materials caused a decrease of the crystallization and melting temperatures and heats. The addition 1% of agar delayed sucrose crystallization and caused over a twofold increase in the value of melting heat as compared to pure amorphous sucrose.

Źródło:

Postępy Techniki Przetwórstwa Spożywczego; 2004, T. 14, nr 2, 2; 26-29
0867-793X
2719-3691

Pojawia się w:

Postępy Techniki Przetwórstwa Spożywczego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Life experiences and transitions of adult migrant learners through a biographical learning perspective.
Przemiany i doświadczenia życiowe uczących się dorosłych migrantów z perspektywy uczenia się biograficznego

Autorzy:

Barkoglou, Georgia
Gravani, Maria N.

Powiązania:

https://bibliotekanauki.pl/articles/2130666.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

adult migrant learners
biographical learning theory
life experiences and transitions
’perspective struggles’
‘identity struggles’
Bakhtinian dialogism
uczący się dorośli migranci
teoria uczenia się biograficznego
życiowe doświadczenia
i tranzycje
„zmagania z perspektywą”
„zmagania z tożsamością”,
dialogiczność bachtinowska

Opis:

The purpose of this paper is to explore adult migrants’ learning in light of their life experiences and transitions, drawing from the narratives of two migrant learners who attended ‘Odysseus’ solidarity school in Greece. The presented research harnesses the biographical learning theory and adopts a Bakhtinian, dialogical way of presenting the data under three themes: wars and identity struggles, religious beliefs, migration and language learning in the host country. The findings revealed that adult migrants’ life experiences and transitions constitute a learning process, which enhances transformative learning of ‘being’, through a process of ‘perspective and identity struggles’. It is also found that the accumulated experiences and transitions as well as adult migrant learners’ previous educational capital are in constant relation to the way they experience language learning in the programme.
Celem niniejszego artykułu jest zbadanie procesu uczenia się dorosłych migrantów w świetle ich życiowych doświadczeń i tranzycji, opierając się na narracji dwóch uczących się osób, które uczęszczały do szkoły solidarnościowej „Odysseus” w Grecji. W przedstawionych badaniach wykorzystano teorię uczenia się biograficznego, a także przyjęto bachtinowski, dialogiczny sposób prezentowania danych, w ramach trzech wątków: wojny i zmagania się z tożsamością, przekonań religijnych, migracji i nauki języka w kraju przyjmującym. Na podstawie wyników ustalono, że życiowe doświadczenia i tranzycje dorosłych migrantów stanowią proces uczenia się, który wzmacnia transformatywne uczenie się „bycia” poprzez proces „zmagań z perspektywą i tożsamością”. Stwierdzono również, że zgromadzone doświadczenia oraz tranzycje, a także wcześniejszy kapitał edukacyjny uczących się dorosłych migrantów, pozostają w stałym związku ze sposobem, w jaki doświadczają oni nauki języków w ramach programu.

Źródło:

Dyskursy Młodych Andragogów; 2020, 21; 125-139
2084-2740

Pojawia się w:

Dyskursy Młodych Andragogów

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

AC Susceptibility Studies of Phase Transitions and Magnetic Relaxation: Conventional, Molecular and Low-Dimensional Magnets

Autorzy:

Bałanda, M.

Powiązania:

https://bibliotekanauki.pl/articles/1399022.pdf

Data publikacji:

2013-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.30.Cr
75.30.Kz
75.40.Gb
75.50.-y

Opis:

The paper presents the review of AC susceptibility measurements in study of magnetic phase transitions and spin dynamics. Examples of several types of phase transitions in conventional and molecular magnets are shown. The phenomenon of magnetic relaxation is briefly ascribed and illustrated with results on relaxation in low-dimensional molecular magnets, such as single molecule magnets, single chain magnets and quasi 1-dimensional systems showing magnetic phase transition to the long-range ordered phase. The following experimental possibilities of the AC technique, which allow to get insight into properties of novel magnetic materials are mentioned: (i) change of the AC field amplitude (in order to distinguish ferro-(ferri) and antiferromagnets); (ii) use of a static field H_{DC} (to conclude on the type of magnetic order and to study the phase diagram); (iii) measurement of nonlinear susceptibilities (to conclude on the type of phase transition); (iv) probing the dependence of both components of susceptibility on frequency of the AC field (to study magnetic relaxation); (v) tests of the DC field effect on the frequency dependence of χ_{AC} (to analyze the possibility of blocking or reentrant spin-glass transition).

Źródło:

Acta Physica Polonica A; 2013, 124, 6; 964-976
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Some Elastic Properties and Phase Transitions in Some Alkali Halides Using Interatomic Potential Model

Autorzy:

Yazar, H. R.

Powiązania:

https://bibliotekanauki.pl/articles/2046838.pdf

Data publikacji:

2006-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.55.Fv
05.70.-a
61.50.Ks
64.10.+h

Opis:

We have predicted the phase transition pressure in some alkali halides using an interatomic potential approach based on rigid ion model. This potential form represents the composite form of the inverse power dependence and exponential dependence of the repulsive energy on interionic distance. Some thermoelastic properties such as second order elastic constants have been calculated using the same potential. The phase transition pressures (28.69 and 2.4 GPa) obtained by us for two alkali halides (NaCl and KCl) are in closer agreement with their corresponding experimental data (29.0 and 2.0 GPa). This approach is promising with respect to prediction of the phase transition pressure of other alkali halides as well.

Źródło:

Acta Physica Polonica A; 2006, 109, 6; 743-751
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

The Problems of Transition Predicates Construction in Hierarchical Concurrent Controllers

Autorzy:

Łabiak, G.

Powiązania:

https://bibliotekanauki.pl/articles/226340.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

binary control system
statechart diagrams
hierarchy;concurrency
conflicting transitions
Boolean predicates
computational complexity
compatibility classes
clique problem

Opis:

The paper presents a problem of a transition predicates construction in hierarchical concurrent state oriented notation. The notation, called statechart diagrams or state machine, serves as a very convenient formalism for specification of a complex behavior of the embedded systems control unit. The controller specified in this way is discrete, deterministic and synchronous system which operates on binary values and can be implemented in programmable devices as a digital circuit. Well designed controller has conflict-free transitions and its concurrent transitions should be independent. In order to meet this requirements transition predicates must be pairwise both orthogonal and non-implicative. Computational complexities of the problems is equal to classic clique problem. The paper also suggests some statecharts syntactic structures solving these problems.

Źródło:

International Journal of Electronics and Telecommunications; 2012, 58, 4; 411-418
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Wpływ zawartości wody na przemiany fazowe mieszaniny sacharozy z pektyną
Effect of water content on the phase transitions of sucrose mixture with low methoxyl pectin

Autorzy:

Pałacha, Z.
Szulakowski, A.

Powiązania:

https://bibliotekanauki.pl/articles/228768.pdf

Data publikacji:

2008

Wydawca:

Wyższa Szkoła Menedżerska w Warszawie

Opis:

W artykule zaprezentowano wpływ stopnia uwodnienia sacharozy amorficznej, pektyny niskometylowanej i ich mieszaniny na parametry przemian fazowych (temperatura przemiany szklistej. temperatura i ciepło krystalizacji, temperatura i ciepło topnienia). Stwierdzono, że wraz ze wzrostem zawartości wody, we wszystkich badanych materiałach, nastąpiło obniżenie temperatury orzemiany szklistej, krystalizacji i topnienia. Natomiast zmiany ciepła krystalizacji i ciepła topnienia nie były jednoznaczne. Obecność pektyny niskometylowanej wpłynęła na opóźnienie procesu krystalizacji sacharozy i spowodowała ponad dwukrotny wzrost wartości ciepła topnienia w porównaniu do czystej sacharozy amorficznej.
In the paper the effects of the degree of hydration of amorphous sucrose, low methoxyl pectin and their mixture on the parameters of phase transitions (glass transition temperature, the temperature and heat of crystallization, melting temperature and heat) were investigated. Increase in water content in all analyzed materials caused a decrease of the glass transition, crystallization and melting temperatures. Whereas changes of heats of crystallization and melting were not unambiguous. Presence of low methoxyl pectin delayed sucrose crystallization and caused over a twofold increase in the value of melting heat as compared to pure amorphous sucrose.

Źródło:

Postępy Techniki Przetwórstwa Spożywczego; 2008, 1; 25-29
0867-793X
2719-3691

Pojawia się w:

Postępy Techniki Przetwórstwa Spożywczego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Remembrance, Identity Politics and Political Transitions: a Comparative Study

Autorzy:

Marszałek-Kawa, Joanna
Wawrzyński, Patryk

Powiązania:

https://bibliotekanauki.pl/articles/594917.pdf

Data publikacji:

2016

Wydawca:

Wydawnictwo Adam Marszałek

Tematy:

democratisation
transformations
collective memory
remembrance policy
new elites
transitional justice
social stratification
symbolic roles

Opis:

The paper presents findings of the comparative study on relationships between remembrance story-telling and the transitional reconstruction of political identities. It identifies in which areas and fields of impact governments tend to use interpretations of the past to promote new leadership visions of society. Moreover, it verifies theoretical hypotheses related to the politicised remembrance and its role as a political asset during transformations, as well as it considers the theoretical framework of democracy-building (and a common prediction of its universal character). As a result, the study offers a detailed picture of the way remembrance narratives are transformed into explanations, justifications or legitimisation of new, post-authoritarian identities based on qualitative-to-quantitative analysis of the intensity of story-telling and its links with transitional identity politics. In the conclusion, the Authors present their consideration of research findings, and they discuss it with reference to the nature of transitional government’s remembrance policy as a sphere of social influence.

Źródło:

Polish Political Science Yearbook; 2016, 45; 11-21
0208-7375

Pojawia się w:

Polish Political Science Yearbook

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Quantum Invariants Descending from the Joule-Lenz Law for the Dissipated Energy Applied in Calculating the Rate of Electron Transitions

Autorzy:

Olszewski, S.

Powiązania:

https://bibliotekanauki.pl/articles/1030325.pdf

Data publikacji:

2017-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

03.65.-w
03.65.Sq

Opis:

The Joule-Lenz law for a classical expense of energy is transformed into a formula representing a quantum-mechanical invariant composed of the interval of energy connected with an electron transition and the corresponding interval of transition time between two quantum levels. Time and energy enter the invariant formula on an equal footing, moreover the time intervals converge with the time periods characteristic for the examined quantum systems. These properties imply to consider the time intervals as quanta of time having character similar to that possessed by the energy. Another result of the transformation of the Joule-Lenz law is the time rate of energy of the quantum transitions. This rate is calculated on a fully non-probabilistic way. When examined for the hydrogen atomic spectrum taken as an example, the obtained quantum rate is by many orders larger than a classical transition rate.

Źródło:

Acta Physica Polonica A; 2017, 131, 2; 226-231
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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