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Wyświetlanie 1-15 z 44
Tytuł:
The transition effect in rail tracks – assessment of transient energy for low frequency vibrations
Autorzy:
Sołkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/231030.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
strefa przejściowa
efekt przejścia
modelowanie
tor kolejowy
podtorze
właściwości
analiza stanów przejściowych
metoda energii
drgania niskiej częstotliwości
transition zone
transition effect
modelling
railtrack
track foundation
characteristics
transient analysis
energy approach
low frequency vibration
Opis:
The transition effect between different track-foundation systems is examined from the point of view of energy that is produced during the passage of load. Analytical solution is given. A model of beam on elastic foundation with damping is used as the base model. It is developed into a model composed of two parts that represent the track-subgrade system with an abrupt change in mechanical parameters: bending stiffness, foundation stiffness, damping, and mass. Several calculations are carried out including examples of comparative calculations with the Finite Difference Model and the Finite Element Model. Transient rail deflections and energy are determined, which may serve to estimate the rate of track-subgrade deterioration.
Źródło:
Archives of Civil Engineering; 2014, 60, 1; 123-143
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykonawstwo stref przejściowych do obiektów mostowych i aspekty modelowania numerycznego oddziaływania pojazd-nawierzchnia-podtorze
Performance of transition zones to bridges and aspects of numerical modelling of the vehicle-track-subgrade interaction
Autorzy:
Sołkowski, J.
Kudła, D.
Powiązania:
https://bibliotekanauki.pl/articles/249028.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej
Tematy:
strefa przejściowa
sztywność nawierzchni
sztywność podtorza kolejowego
efekt progowy
transition zone
track and subgrade stiffness
transition effect
Opis:
W artykule przedstawiono wyniki pomiarów sztywności nawierzchni i podtorza w obszarze obiektów mostowych, które zostały wykonane po ich modernizacji. Na podstawie danych uzyskanych z pomiarów przeprowadzono symulacje komputerowe przejazdów pociągu testowego na analizowanych odcinkach toru (siedem stref przejściowych) stwierdzając dobrą zgodność obliczeń z pomiarami co do przewidywanych ugięć szyny. Ponadto porównano obliczenia z wykorzystaniem modeli w Metodzie Różnic Skończonych z modelami w Metodzie Elementów Skończonych (2D oraz 3D), także stwierdzając dobrą zgodność wyników. Poddano dyskusji wpływ nieliniowości podłoża na uzyskiwane wyniki obliczeń oraz ewentualne rozszerzenie pomiarów.
In the paper the field measurements concerning track and subgrade stiffness within bridge abutments and transition zones have been presented. On the basis of the field data the numerical calculations have been performed using the Finite Difference Model and Finite Element Models (2D and 3D). Good agreement between the measured rail deflections and calculated deflections has been found. The influence of the foundation nonlinearities on the obtained rail deflections has been discussed.
Źródło:
Zeszyty Naukowo-Techniczne Stowarzyszenia Inżynierów i Techników Komunikacji w Krakowie. Seria: Materiały Konferencyjne; 2013, 2(101); 275-289
1231-9171
Pojawia się w:
Zeszyty Naukowo-Techniczne Stowarzyszenia Inżynierów i Techników Komunikacji w Krakowie. Seria: Materiały Konferencyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetocaloric Effect and Transition Order in $HoAl_{2}$
Autorzy:
Baran, S.
Duraj, R.
Szytuła, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399261.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Cr
75.30.Kz
75.30.Sg
Opis:
Magnetic measurements of $HoAl_{2}$ are reported. The compound crystallizes in the cubic $MgCu_{2}$-type crystal structure. $HoAl_{2}$ exhibits two successive magnetic transitions: below $T_{c}$ = 29 K a ferromagnetic order is formed while anomaly at $T_{t}$ = 20 K is related to reorientation of magnetic moment. Near transition temperatures a magnetocaloric effect with magnetic entropy changes -$ΔS_{m}$ equal to 6.3 J/(mol K) at $T_{c}$ and 5.0 J/(mol K) at $T_{t}$ for an external field $μ_{0}H$ = 9 T is observed.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 815-817
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ab Initio Investigation on the Effect of Transition Metals Doping and Vacancies in WO₃
Autorzy:
Mansouri, M.
Mahmoodi, T.
Powiązania:
https://bibliotekanauki.pl/articles/1398658.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.A-
61.72.-y
71.15.Mb
71.15.Dx
Opis:
We did a density functional theory spin-polarized calculation based on pseudopotential method on the effect of both vacancy and substitutional impurity in the tungsten tri-oxide lattice. We investigated oxygen and tungsten vacancies and for substitutional dopants we used palladium (Pd), platinum (Pt) and gold (Au) atoms with the formula $A_xW_{1-x}O_3$ and x=0.125, 0.25, 0.375, 0.5. We obtained electronic band structure, density of states and magnetization of defected and doped WO₃. The results show that in the presence of tungsten vacancy, WO₃ acts as a semiconductor with an indirect band gap while oxygen vacancy induces a metallic behavior for WO₃. Besides, for Pt and Pd the location of trap states lead to photoexcited hole capturing, which can improve photocurrent but for Au dopant, the trap states occur in the middle of the band gap as active recombination centers. Furthermore, both kind of vacancies and Pt dopant can induce magnetization in all values of x, while Pd and Au are less efficient in inducing magnetization.
Źródło:
Acta Physica Polonica A; 2016, 129, 1; 8-14
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ways of Eliminating the Road Effect in Transition Zones from the Railway Track to Bridge Structures
Autorzy:
Zamiar, Zenon
Surowiecki, Andrzej
Saska, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/503870.pdf
Data publikacji:
2019
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
railway track
engineering facility
transition zone
reinforcing inserts
Opis:
Selected methods of constructing special inserts in the transition zones between the embankment of the railway track and the engineering object (bridge, viaduct, or culvert) were discussed. The purpose of mounting the designed inserts is to eliminate the so-called threshold effect, i.e. continuously creating a mild change in the stiffness of the ground under the track. In addition to the solutions presented in practice, attention was also paid to projects developed by the authors of this article. T
Źródło:
Logistics and Transport; 2019, 44, 4; 85-93
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational study of substrate isotope effect probes of transition state structure for acetylcholinesterase catalysis
Autorzy:
Sikorski, R..
Malany, S.
Seravalli, J.
Quinn, D.
Powiązania:
https://bibliotekanauki.pl/articles/147114.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
acetylcholinesterase
carbonyl addition reactions
enzyme mechanisms
quantum mechanical calculations
transition state structure
Opis:
Secondary isotope effects for carbonyl addition reactions of methyl thioacetate, acetone and acetaldehyde have been calculated by ab initio quantum mechanical methods in an effort to interpret measured beta-deuterium isotope effects on acetylcholinesterase- catalyzed hydrolysis of acetylthiocholine. The calculated beta-deuterium isotope effect for equilibrium addition of methanol to methyl thioacetate is D3Keq = 0.965, and the corresponding effect for addition of methoxide ion to methyl thioacetate wherein three waters are hydrogen bonded to the carbonyl oxyanion is D3Keq = 1.086. Neither of these calculated isotope effects is as inverse as the experimental beta-deuterium isotope effect for acetylcholinesterase-catalyzed hydrolysis of acetylthiocholine, D3kE = 0.90š0.03. Structural comparisons show that the water-solvated methoxide adduct of methyl thioacetate is more expanded than is the neutral methanol addition adduct, and suggest that the degree to which the isotope effect is inverse (i.e. less than) is inversely correlated to the degree of expansion of the adduct. A similar correlation of beta-deuterium and beta-deuterium secondary isotope effects with the degree of expansion of the adducts is found for equilibrium additions of methanol and methoxide ion to acetaldehyde. These computational results suggest that the markedly inverse beta-deuterium isotope effect for the acetylcholinesterase reaction arises from enzymic compression of the transition state.
Źródło:
Nukleonika; 2002, 47,suppl.1; 9-12
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Transition Metals on Quasicrystalline Phase Formation in Mechanically Alloyed Al65Cu20Fe15 Powder
Autorzy:
Mitka, M.
Kalita, D.
Góral, A.
Lityńska-Dobrzyńska, L.
Powiązania:
https://bibliotekanauki.pl/articles/351525.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical alloying
quasicrystal
Al-Cu-Fe
transition metals
Opis:
The effect of replacing iron with transition metals (M = Mn, Cr, Co) on the microstructure of mechanically alloyed Al65 Cu20 Fe15 quasicrystalline powder was examined by X-ray diffraction and transmission electron microscopy methods. Powders of various compositions were milled in a high-energy planetary ball mill up to 30 hours at a rotation speed 350 rpm using WC milling media. The amount of the fourth additions was constant in all powders and Fe atoms were replaced with Mn, Cr or Co in a 1:1 ratio, while the content of the Al and Cu was selected in two ways: they remained the same as in the initial ternary Al65 Cu20 Fe15 alloy or changed to obtain e/a ratio = 1.75 (optimal for icosahedral quasicrystalline phase). Quasicrystalline phase formed in the quaternary Al65 Cu20 Fe7.5 M7.5 powders, whereas in the second group of compositions only crystalline phases were identified.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1129-1133
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Macroeconomic stability in transition economies as an effect of eu membership in light of a comparative analysis
Stabilność makroekonomiczna krajów transformacji systemowej jako efekt członkostwa w Unii Europejskiej w świetle analizy porównawczej
Autorzy:
Kotliński, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/1182372.pdf
Data publikacji:
2020
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
Macroeconomic Stabilization Pentagon
macroeconomic stabilization
post‑transition economies
pięciokąt stabilizacji makroekonomicznej
stabilizacja makroekonomiczna
kraje posttransformacyjne
Opis:
Przygotowania przedakcesyjne i sama akcesja do Unii Europejskiej były znaczącymi zmianami instytucjonalnymi dla krajów w transformacji. Kraje niebędące członkami UE, takie jak Albania, Serbia, Ukraina, Białoruś, Gruzja i Rosja, również przechodziły transformację systemową. Czy dobre wyniki makroekonomiczne krajów Europy Środkowo-Wschodniej są rezultatem członkostwa w Unii Europejskiej, czy tylko transformacji od socjalizmu do gospodarki rynkowej? Celem badań jest porównanie stabilności makroekonomicznej dwóch grup krajów postsocjalistycznych będących członkami UE i niebędących jej członkami. W badaniach posłużono się metodą analizy porównawczej. Wykorzystano metodę pięciokąta stabilności makroekonomicznej. Badane kraje podążały różnymi ścieżkami transformacji, ale użyte wskaźniki stabilności makroekonomicznej są mierzalne i porównywalne. Wyniki badań wskazują, że kraje należące do UE charakteryzują się wyższym poziomem stabilności makroekonomicznej.
Źródło:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2020, 64, 10; 31-42
1899-3192
Pojawia się w:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of water activity and glass transition on critical preservation conditions of dried squids
Autorzy:
Ren, A.-Q.
Zhang, M.
Mujumdar, A.
Powiązania:
https://bibliotekanauki.pl/articles/25846.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
critical preservation condition
dried squid
glass transition
glass transition temperature
physical parameter
preservation
sorption isotherm
squid
water activity
Źródło:
International Agrophysics; 2011, 25, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of changes in the economic structure on entrepreneurial activity in a transition economy: the case of Poland
Autorzy:
Zygmunt, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/22444432.pdf
Data publikacji:
2020
Wydawca:
Instytut Badań Gospodarczych
Tematy:
structural changes
entrepreneurial activity
transition economy
service sector
Opis:
Research background: While entrepreneurship in transition economies is the subject of a growing body of literature, the debate on factors influencing entrepreneurial activity in such economies is still incomplete. This paper extends this debate by focusing on the effect of changes in the economic structure on entrepreneurship in Poland. The findings might be supportive for policymakers in pursuing policy aimed at boosting entrepreneurship in a transition economy. Purpose of the article: The aim of the paper is to investigate the extent to which changes in the economic structure impact entrepreneurial activity in Poland. The paper contributes to the literature by providing empirical support to the pending research efforts to recognize entrepreneurship dimensions in a transition economy. Methods: The hypothesis was tested with fixed effects panel regression with robust standard errors. Data were sourced from the Statistics Poland for all Polish NUTS?2 regions for the period 2003?2017. Panel data are balanced and include 3 600 observations. Findings & Value added: This paper extends previous research on factors affecting entrepre-neurial activity in a transition economy by focusing on the importance of changes in the economic structure for new firm creation. The findings provide evidence of the significant value of the service sector in boosting entrepreneurial activity in Poland. The findings might attract attention of policymakers. Fostering structural change towards smart specialization in services should be regarded when constituting programmes supporting entrepreneurship.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2020, 15, 1; 49-62
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Effect of Structure on Physicomechanical Properties of Transition Metals Diboride Films
Autorzy:
Goncharov, A.
Yunda, A.
Komsta, H.
Rogalski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1033745.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
transition metal diborides
nanocomposite coating
magnetron sputtering
structural state
hardness
elastic modulus
Opis:
Research of the effect of structure on composition and physicomechanical properties of transition metals diboride films deposited by RF-magnetron sputtering was carried out. It was shown that there is a wide range of different structures, from amorphous to nanocrystalline one with 1-40 nm nanocrystallite sizes in the case of transition metals diboride films. The correlation between the structure, composition, and physicomechanical properties of transition metals diboride films was established.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 270-273
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separating aggregate discouraged and added worker effects: the case of a former transition country
Autorzy:
Congregado, Emilio
Gałecka-Burdziak, Ewa
Golpe, Antonio A.
Pater, Robert
Powiązania:
https://bibliotekanauki.pl/articles/19233709.pdf
Data publikacji:
2021
Wydawca:
Instytut Badań Gospodarczych
Tematy:
discouraged worker effect
added worker effect
vector autoregression
sign restrictions
Opis:
Research background: We analyse the added worker effect (AWE) and the discouraged worker effect (DWE) from an aggregate perspective. The first effect refers to an increase in labour force participation in response to a decrease in the wage rate. The second effect refers to the decision by workers who have been unsuccessful in their job search to leave the labour market or to decrease their labour force participation. For our analysis, we use the case of Poland, a country with a persistently low labour force participation rate. Purpose of the article: While previous studies focused on the net of the two effects, we aim to analyse the two effects both separately and simultaneously. We propose a new approach for analysing the two effects. We generalise and model them as resulting from different shocks: (i) the AWE as the result of a negative wage income shock, and (ii) the DWE as the result of a positive job search time shock. The underlying assumption is that both shocks have at least a transitory effect on the labour force participation rate. However, we also track the potential long-lasting effects of these shocks, and we analyse the reactions of gender and age groups to them. While this approach demonstrates the robustness of our results, it also provides the range of the sensitivity, as it shows that there are large differences in the magnitude of the AWE and the DWE for different labour market cohorts. Methods: We use the multivariate unobserved component model to extract the AWE and the DWE, and we then use VAR models, applying sign and exclusion restrictions to model the underlying shocks. We use quarterly data for Poland in 1995-2019. Most of these data come from the Labour Force Survey, while the rest come from Statistics Poland. Findings & value added: In contrast to previous literature, which analysed only the net effect of the two effects, we model the AWE and the DWE separately. Contrary to the findings of previous research, our approach seems to confirm that both effects are simultaneously present in the labour market, and both effects influence the labour force participation rate. Thus, we find that both effects are significant. Specifically, we show that the AWE is stronger, but transitory; while the DWE is weaker, but long-lasting.
Źródło:
Oeconomia Copernicana; 2021, 12, 3; 729-760
2083-1277
Pojawia się w:
Oeconomia Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Study of the Effect of Light on Nematic to Isotropic Phase Transition
Autorzy:
Suresha, B.
Radhakrishna, M.
Govind, A.
Powiązania:
https://bibliotekanauki.pl/articles/1493611.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.-v
64.70.M-
Opis:
Optical response of liquid crystals is very important from the point of view of applications of liquid crystals in display and data storage devices. Experiments have shown that UV rays incident on nematic liquid crystals doped with photoactive azo compounds lower the nematic isotropic transition temperature $(T_{NI})$. This is attributed to the transformation of photoactive trans isomer to cis isomer due to UV rays. We have earlier developed a mean field model involving molecular explanation for two lengths in which the mutual orientation of near neighbor molecules changes from an antiparallel to a parallel configuration as the temperature lowered. In this paper, this model is extended to include the length change from trans to cis isomer. The calculated values of change in $T_{NI}$ qualitatively agree with experimental trends.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 462-467
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of molecular weight on the yield behaviour of EPY epoxy compound
Autorzy:
Urbaniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/957935.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
epoxy network
molecular weight between crosslinks
glass transition temperature
yield behaviour
Opis:
A series of epoxy networks with molecular weight between crosslinks (Mc) ranging from 117 to 508 g/mol were investigated by employing as DSC and DMA methods and compression testing over a broad range of test temperatures (from 20 to 120°C) and strain rates (from 0.0208 to 20.8 min–1). Mechanical characteristics vs. testing temperature and strain rate developed in relation to working conditions of EPY compound applied for machine foundation chocks as well as effect of crosslinking on glass transition temperature (Tg) presented in this paper let to find out the effect of molecular architecture composed chiefly by Mc on the thermal and mechanical properties that govern yield behaviour of the material. The investigations carried out in a.m. ranges of testing temperatures and strain rates showed that whichever change of Mc is related to the change in crosslink density causing relative shift in the Tg of the compound. However, a sensitivity of the polymer material on changes in strain rate falls down with growth of testing temperature. Obtained results prove that yielding in EPY compound can be examined in categories of the Eyring’s plastic flow model in which yielding is described.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 32; 230-239
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
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