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Tytuł:
Expecting the Unexpected (Practical Experience of Developing Courses for Able Pupils 10-18 years old)
Oczekujący nieoczekiwanego
Autorzy:
Warren, E.G.
Powiązania:
https://bibliotekanauki.pl/articles/18812917.pdf
Data publikacji:
1997
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Źródło:
Acta Universitatis Lodziensis. Folia Psychologica; 1997, 01; 153-159
2353-4842
Pojawia się w:
Acta Universitatis Lodziensis. Folia Psychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Migracje wojewódzkie na pobyt stały w województwie śląskim w 2010 roku w świetle praw migracji E.G. Ravensteina
Permanent Residence Migration in Silesia Province (Poland) in 2010 in the Light of E.G. Ravensteins Laws of Migration
Autorzy:
Mielecka-Kubień, Zofia
Powiązania:
https://bibliotekanauki.pl/articles/587199.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Emigracja
Imigracja
Migracja ludności
Emigration
Immigration
Population migration
Opis:
In view of globalization process analysis of migration forms important and actual problem. The paper presents the results of statistic, econometric and demographic analysis of migration processes in Silesia province in Poland in 2010. Especially taken into account was problem of negative migration balance in the province, caused, as stated, by decreasing influx to the Silesia province from the others. There were estimated migration models of influx and outflow of the migrants. Finally, it has been stated that some of the migration laws formed in XIX century by E.G. Ravenstein are still actual in Poland, among others the law of relation between the level of migration and its distance, and the law of opposite flows of migration, while the law of higher migration of urban (vs. rural) inhabitants was no longer valid.
Źródło:
Studia Ekonomiczne; 2013, 142; 24-40
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Struktura i właściwości termiczne nanokompozytów ekspandowany grafit(EG))/poli(tereftalan etylenu)(PET)
Morphology and Thermal Properties of Expanded Graphite (EG)/Poly(ethylene terephthalate) (PET) Nanocomposites
Autorzy:
Paszkiewicz, S.
Rosłaniec, Z.
Szymczyk, A.
Spitalsky, Z.
Mosnacek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1217944.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
ekspandowany grafit
PET
polikondensacja in situ
morfologia
stabilność termiczna
expanded graphite
in situ policondensation
morphology
thermal stability
Opis:
Uzyskano nanokompozyty poli(tereftalanu etylenu) z ekspandowanym grafitem (PET/EG) o zawartości nanonapełniacza 0.025 - 0.4 %wag. metodą polimeryzacji kondensacyjnej (polikondensacji) in situ. Określono ich morfologię (SEM i TEM), stabilność termiczną przy wykorzystaniu metody TGA (temperatury odpowiadające: 2% (T-2%),10% (T-10%) i 50% (T-50%) ubytku masy, energię aktywacji metodą Freemana-Carrolla (Ea), temperaturę maksimum szybkości ubytku masy nanokompozytów w atmosferze powietrza i w argonie. Oceniono również wpływ grafenu na przemiany fizyczne zachodzące w PET (DSC). Wyniki badań nanokompozytów PET/EG porównano z wynikami badań niemodyfikowanego PET. Fotografie SEM nanokompozytów wykazują dwufazową strukturę układów PET/EG z wyraźnie widocznymi płytkami grafenu, jak i nielicznymi aglomeratami. Badania nanokompozytów PET/EG z wykorzystaniem techniki TEM potwierdziły obecność płytek grafenowych o wielkości ok. 1-10 ?m. Oznacza to, że zastosowana metoda in situ pozwala na otrzymanie rozsuniętych i stosunkowo równomiernie rozłożonych płytek grafenowych (EG) w osnowie PET. Ponadto wykazano, że dodatek nanonapełniacza nie wpływa znacząco na temperatury przemian fizycznych, jak również na stopień krystaliczności PET. Zaobserwowano natomiast wyższą termostabilność oraz stabilność termo-oksydacyjną nanokompozytów wynikającą z udziału nanocząstek grafenowych.
Nanocomposites based on poly(ethylene terephtalate) and expanded graphite (PET/EG) with 0.025-0.4wt.% nanofiller content were prepared by in situ condensation polymerization (polycondensation). Their morphology was determined (TEM, SEM), thermal stability by TGA (temperatures corresponding to: 2% (T-2%),10% (T-10%) and 50% (T-50%) weight loss, activation energy by Freeman-Carroll method (Ea), temperature of maximum mass loss rate of nanocomposites in air and in argon. Also the influence of graphene was assessed on the physical transition occurring in the PET (DSC). The results of PET/EG nanocomposites were compared with the unmodified PET. SEM images of nanocomposite exhibit a diphasic structure of PET / EG of clearly visible graphene platelets, and few agglomerates. The study of nanocomposites of PET / EG using TEM techniques confirmed the presence of grephene platelets size of about 1÷10 ?m. This means, that in situ polymerization has been used to obtain exfoliated and relatively evenly spaced graphene plates (EG) in the PET matrix. In addition, it was demonstrated that the addition of nanofiller not significantly affect the physical transition temperature, as well as the degree of crystallinity of PET. Higher thermal stability and thermo-oxidative stability of the nanocomposites was observed resulting from participation of graphene nanoparticles.
Źródło:
Chemik; 2012, 66, 1; 21-30
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Współzależności pomiędzy inwestycjami a konkurencyjnością i przeżywalnością prywatnych firm leśnych
Interdependence between investments, competition and survivability of private forest companies
Autorzy:
Runo, E.G.
Powiązania:
https://bibliotekanauki.pl/articles/960402.pdf
Data publikacji:
2012
Wydawca:
Wyższa Szkoła Zarządzania Środowiskiem w Tucholi
Źródło:
Zarządzanie Ochroną Przyrody w Lasach; 2012, 06
2081-1438
2391-4106
Pojawia się w:
Zarządzanie Ochroną Przyrody w Lasach
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The dependency on the temperature of efficiency of the regeneration process in glycols
Autorzy:
Smulski, R.
Sacha, J.
Powiązania:
https://bibliotekanauki.pl/articles/298709.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
gas dehydration
EG
DEG
TEG
TREG
glycol regeneration
Opis:
The water content of glycol is important from the perspective of the dehumidification quality of natural gas, as the greater is it’s content, the more adversely it will affect further absorption of glycol during the dehumidification process. In order to restore its original properties, sorption glycol undergoes regeneration that is the process which consists of thermal evaporation of water contained therein. The separation of these components is made possible by the evaporation of water at a lower temperature, compared to glycols. In the industrial practice of dehumidifying natural gas using the absorption method, four kinds of glycol can be used. Their characteristics are presented in the report, discussing the current methods of regeneration, as well as presenting results from the laboratory tests which consisted of water content measurements taken after evaporation of water from the glycol solutions. These results were summarized and compared. To determine the content of water, the Karl Fischer titration method was used.
Źródło:
AGH Drilling, Oil, Gas; 2016, 33, 4; 733-746
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transkolostralna migracja larw Strongyloides ransomi u świń
Trans-colostral migration of larvae of Strongyloides ransomi in the pig
Transkolostralnaja migracija lichinok Strongyloides ransomi u svinejj
Autorzy:
Batte, E.G.
Powiązania:
https://bibliotekanauki.pl/articles/2176427.pdf
Data publikacji:
1973
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1973, 19, 2; 155-158
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Level of Knowledge about Former Disease Terminology and Medical Terms of Medicine Faculty Students
Autorzy:
Demiralay, H.
Akarslan, F.
Güngör, F.
Tulunbaci, M.
Powiązania:
https://bibliotekanauki.pl/articles/1402496.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.64.Gz
43.10.Eg
Opis:
There are still patients which use obsolete medical terms. People's terminology, rather than the modern terminology, is often used to describe symptoms or diseases. Medical terms can also be replaced with terms inherent to patient's own culture. Seen from this perspective, the knowledge of the former medical terms and the terms used colloquially is very helpful for doctors. The purpose of this study was to investigate the knowledge of former medical terms among the medical students. This study was performed on 102 students of medicine faculty. Students, who gave their consent, were interviewed in a face-to-face fashion. The results of the survey were statistically analyzed.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-436-B-437
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synteza enzymatyczna multiblokowego kopolimeru poli(bursztynianu butylenu-co-glikolu etylenowego) (PBS-EG) katalizowana lipazą B ze szczepu Candida antarctica
Enzymatic synthesis of poly(butylene succinate-co-ethylene glycol) multiblock copolymer (PBS-EG) catalyzed by lipase B from Candida antarctica
Autorzy:
Gradzik, B.
El Fray, M.
Powiązania:
https://bibliotekanauki.pl/articles/285530.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
kataliza enzymatyczna
lipaza
kopolimery estrowo-eterowe
poli(bursztynian butylenu)
polikondensacja
enzymatic polymerization
lipase
poly(butylene succinate)
poly(ether-ester) copolymer
polycondensation
Opis:
W pracy przedstawiono badania nad syntezą segmentowego kopoli(estro-eteru) - poli(bursztynianu butylenu-co-glikolu etylenowego) (PBS-EG) z użyciem lipazy B, pochodzącej ze szczepu Candida antarctica jako katalizatora. Polimeryzację przeprowadzono w roztworach eteru difenylowego z udziałem bursztynianu dietylu i 1,4-butanodiolu oraz poli(glikolu etylenowego) (PEG), wprowadzanego na różnych etapach reakcji, w temperaturze 80oC w warunkach zmiennego ciśnienia. Oceniono wpływ ciśnienia oraz sposobu wprowadzania PEGu na budowę chemiczną i właściwości termiczne otrzymanych kopoli(estro-eterów). Budowa chemiczna zsyntezowanych kopolimerów została oceniona na podstawie spektroskopii magnetycznego rezonansu jądrowego (1H NMR) oraz spektroskopii w podczerwieni (IR). Właściwości termiczne zbadano metodą różnicowej kalorymetrii skaningowej (DSC). Wykazano, że zastosowanie enzymu jako katalizatora prowadzi do otrzymania kopolimeru segmentowego, jednak reakcje przebiegają z dosyć niskimi wydajnościami oraz powstałe kopolimery wykazują małą wartość masy molowej. Stwierdzono również, że na większą wydajność reakcji oraz wzrost masy molowej wpływa jej prowadzenie w warunkach nadciśnienia niż podciśnienia.
The paper presents studies on the synthesis of segmented copoly(ester-ether) - a poly(butylene succinate-co-ethylene glycol) (PBS-EG) using as a catalyst - lipase B derived from Candida antarctica strain. The polymerization was performed in the solutions of diphenyl ether, involving diethyl succinate and 1,4-butanediol and poly(ethylene glycol) (PEG) introduced at different stages of the reaction, at 8CPC under variable pressure. The influence of variable pressure and methods of introducing PEG monomer on the chemical structure and thermal properties of resulting copoly(ester-ether) was examined. The chemical structure of synthesized copolyesters was determined by nuclear magnetic resonance spectroscopy (1H NMR) and infrared spectroscopy (IR). The thermal properties were investigated using differential scanning calorimetry (DSC). It was observed that use of enzyme as catalyst allows to obtain a segmented copolymer, however the reactions take place with relatively low yields and molar mass. It was also found that higher yield and molar mass of the reaction was observed at overpressure than at underpressure conditions.
Źródło:
Engineering of Biomaterials; 2013, 16, 121; 42-48
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trigonometric solution for an exponentially graded thick plate resting on elastic foundations
Autorzy:
Zenkour, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/139868.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
trigonometric plate theory TPT
exponentially graded plate
elastic foundation
teoria tablic trygonometrycznych TPT
płyta EG
podstawa elastyczna
Opis:
This article investigates the solution of exponentially graded (EG) thick rectangular plates resting on two-parameter elastic foundations according to a trigonometric plate theory (TPT). This theory includes the effect of both shear and normal strains thickness without needing to any shear correction factor. The displacement fields contains initial terms of a power series across plate thickness as well as additional trigonometric terms. The material properties of plate is graded such that Lamé’s coefficients convert exponentially in a given constant orientation.Equilibrium equations according to the EG plate resting on Pasternak’s foundations are derived. The solution is obtained by using Navier’s technique. Numerical results for the EG thick plate on elastic foundations are presented, and compared with those available in the literature. The influences of Winkler’s and Pasternak’s parameters, side-to-thickness ratio, inhomogeneity parameter and aspect ratio on the bending responses of EG plates are investigated.
Źródło:
Archive of Mechanical Engineering; 2018, LXV, 2; 193-208
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Taxonomic evaluation of Hedera crebrescens: A potentially invasive ivy in Central Europe
Autorzy:
Major, E.I.
Toth, E.G.
Benyei-Himmer, M.
Hohn, M
Powiązania:
https://bibliotekanauki.pl/articles/2130709.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Hedera crebrescens
invasive species
ivy
molecular study
phylogeny
taxonomy
Opis:
Although Hedera helix is the only native ivy distributed in Central Europe, other ivy species are cultivated in this region and have horticultural importance, including H. hibernica, H. colchica, and H. azorica. On the basis of morphological, cytological, and phenological studies, a newly identified diploid species of ivy, H. crebrescens Bényei-Himmer & Höhn, was recently described from Hungary. Due to its high reproductive capacity and vigorous growth, this species can be considered a potentially invasive plant that could readily supplant H. helix in its native habitats. To characterize the molecular taxonomic status of H. crebrescens, we conducted a molecular genetic analysis based on five chloroplast and one nuclear DNA regions. Our phylogenetic reconstruction supported the monophyly of Hedera, with a tree topology similar to that previously obtained based on phylogenetic cpDNA analyses. Mediterranean species of ivy were well separated from the remainder of the European species, as well as from Asian species. Hedera crebrescens represented a single independent haplotype within the Asian–European cluster, whereas H. helix proved to be polyphyletic. The detected species-specific haplotype and invariability among studied specimens obtained from different geographical locations, provide support for the taxonomical autonomy of H. crebrescens.
Źródło:
Acta Societatis Botanicorum Poloniae; 2020, 89, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
«Og det er ikkje vits i å seie noko» – om Jon Fosses "Eg er vinden"
There is no point in saying anything – on 'I Am the Wind' by Jon Fosse
Autorzy:
Domsa, Zsófia
Powiązania:
https://bibliotekanauki.pl/articles/696919.pdf
Data publikacji:
2018-12-28
Wydawca:
Uniwersytet Gdański. Wydział Filologiczny
Opis:
I Am the Wind is one of the last works Jon Fosse wrote for theatre. The piece was first staged during the Bergen Festival in 2007. Even though it was only a few years later that Fosse declared the end of his dramatic career, his playwriting with this play is clearly moving on its way out of the theatre and into a borderland between thought and action; it manifests an extremely subjective and the physical presence in which items from Fosse’s poetry are more clearly seen. In this article, I want to read I Am the Wind primarily as a theatre piece, that is, a text written for the stage, and emphasize the use of poetic elements. The piece’s sections of dialogue revolve around existential and individual psychological questions at the boundary of the banal; it thematizes both the need and the fear of loneliness. It also deals with nature’s magical attraction to humans and with the importance of silence on several levels. The work stages the death wish of late modern humanity, and provides lyrical and language-philosophical interpretations of this, which I wish to read into the apparently simple plot of the piece. I Am the Wind can be described through a number of features that also characterize both earlier and later pieces of Fosse’s writing. Simply put, the play is about two people’s voyage to the open sea in a boat; one of the characters jumps overboard and commits suicide. The situation in the play takes place either in the head of the one who witnesses the suicide, or there is a meeting between the two characters after death. Either way, this is a basic situation which assumes that the expectations of a realistic stage action are to be set aside. But what is the reason why Fosse shifts his piece against a dramatic zero point? What is the purpose of reducing the stage expression to a lyrical outline that almost destroys the theatrical form? Fosse often opts for silent moments in his pieces. I Am the Wind is an infinite and enigmatic boat trip that requires us to look at the play as a landscape without being forced to define it in words: for the words disappear during the boat trip; they are taken and gone with the wind; “there is no point in saying anything.”
Źródło:
Studia Scandinavica; 2018, 2, 22; 102-115
2657-6740
Pojawia się w:
Studia Scandinavica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical Properties of Aluminum Oxide-Ethylene Glycol (Al₂O₃-EG) Nanofluids
Autorzy:
Fal, J.
Żyła, G.
Gizowska, M.
Witek, A.
Cholewa, M.
Powiązania:
https://bibliotekanauki.pl/articles/1402557.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Jc
72.15.Cz
72.60.+g
73.61.At
Opis:
Nanofluids are suspensions of nanometrical size particles in a liquid base, which is usually water, oil or ethylene glycol. The potential practical use of nanofluids caused in recent years a considerable intensification of research into their properties. The most widely studied of physical properties include the fluid rheology, thermal conductivity and electrical parameters. The paper presents electrical properties of aluminium oxide (Al₂O₃) nanofluids based on ethylene glycol (EG). Nanoparticles used to produce nanosuspensions employed in measurements have size between 100-300 nm. Electrical properties was investigated in a wide range of temperatures (-10°C-55°C) and frequencies (0.02-200 kHz) using a measuring LCR bridge connected to a temperature stabilization system based on liquid nitrogen and Peltier element.
Źródło:
Acta Physica Polonica A; 2015, 128, 2; 153-155
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coupled Multiphysics Models for the Analysis οf the Conduction and Valence Band Eigenenergies in Cylindrical Quantum Dots
Autorzy:
Prabhakar, S.
Takhtamirov, E.
Melnik, R.
Powiązania:
https://bibliotekanauki.pl/articles/1490797.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.-m
73.21.La
62.23.Eg
Opis:
We develop a mathematical model for the analysis of conduction and valence band eigenenergy in quantum dots. We apply the model to study the band structure calculations of low dimensional semiconductor nanostructures such as wurtzite AlN/GaN quantum dots in cylindrical coordinates in presence of applied magnetic field along z-direction. We use a finite element method to solve the resulting model and to obtain eigenvalues and wave functions of cylindrical quantum dots. We provide details of the methodology of solution and appropriate boundary conditions. A special attention is given to the case of applied magnetic field along z-direction, we found localized eigenstates and wave functions in the conduction and valence bands for which our results open new possibilities for the design of the optoelectronics devices where the combination of electron-hole pairs can be used as tuning parameters.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 85-88
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic Launch to Space
Autorzy:
Wetz, D.
McNab, I.
Stefani, F.
Parker, J.
Powiązania:
https://bibliotekanauki.pl/articles/1807917.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
96.12.Hg
98.35.Eg
94.30.Kq
94.05.Rx
94.20.Fg
94.20.wc
94.20.wf
Opis:
Many advances in electromagnetic (EM) propulsion technology have occurred in recent years. Linear motor technology for low-velocity and high-mass applications is being developed for naval catapults and missile launchers. Such technology could serve as the basis for the launch of a first-stage booster launch - for example, as suggested some years ago by the US National Aeronautics and Space Administration (NASA) in the Maglifter concept. For higher velocities, experimental laboratory railguns have demonstrated launch velocities of 2-3 km/s and muzzle energies greater than 10 MJ. The extension of this technology to the muzzle velocities ( ≥ 7500 m/s) and energies (hundreds of megajoules) needed for the direct launch of payloads into orbit is very challenging but may not be impossible. For launch to orbit, long launchers (> 1000 m) would need to operate at accelerations > 1000 G to reach the required velocities, so it would only be possible to launch rugged payloads, such as fuel, water, and material. This paper provides an overview of these concepts and includes a summary of the recent advances made in this area.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1066-1068
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Absence of the severe combined immunodeficiency disease gene among Arabian horses in Poland
Autorzy:
Terry, R R
Cholewinski, G.
Cothran., E.G
Powiązania:
https://bibliotekanauki.pl/articles/2043861.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
disease
horse
veterinary science
Polska
severe combined immunodeficiency disease
purebred Arabian breed
Źródło:
Journal of Applied Genetics; 1999, 40, 1; 39-41
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trzy dobre wiadomości dla Starobielszczan
Autorzy:
EG.
Powiązania:
Rodowód II 2005, nr 1/2, s. 30
Data publikacji:
2005
Tematy:
Międzynarodowy Motocyklowy Rajd Katyński (5; 2005)
Egzekucja polskich oficerów w Charkowie tablice pamiątkowe Ukraina
Opis:
Maraton w Charkowie, 5 Międzynarodowy motocyklowy Rajd Katyński do Cmentarzy Katyńskich, tablica pamiątkowa na murze klasztoru w Starobielsku.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Monte Carlo Calculations for Photon Attenuation Studies on Different Solid Phantom Materials
Autorzy:
Gundogdu, O.
Tarim, U.
Gurler, O.
Powiązania:
https://bibliotekanauki.pl/articles/1031097.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
21.60.Ka
25.20.Dc
87.66.Xa
25.60.Dz
29.27.Eg
Opis:
The linear attenuation coefficients of water and some solid phantom materials, namely of solid water RMI-457, of plastic water, of RW3 solid water, and of Perspex were determined by Monte Carlo calculations, for gamma-ray photons with energies of 59.5, 80.9, 140.5, 356.5, 661.6, 1173.2, and 1332.5 keV. The calculated values were compared with the experimental results presented by other researchers and with theoretical values obtained using the XCOM database. Good agreement was observed between the calculations, the experimental, and the theoretical values. The results indicate that the process in Monte Carlo code can be followed to determine the equivalency of other materials at several energies. Three shielding factors such as half-value layer, tenth-value layer, and mean free path were calculated at all considered gamma-ray energies.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1032-1035
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Galois Properties of the Eigenproblem of the Hexagonal Magnetic Heisenberg Ring
Autorzy:
Banaszak, G.
Barańczuk, S.
Lulek, T.
Milewski, J.
Stagraczyński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1427165.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Aa
73.21.-b
85.35.Be
89.70.Eg
Opis:
We analyse the number field-theoretic properties of solutions of the eigenproblem of the Heisenberg Hamiltonian for the magnetic hexagon with the single-node spin 1/2 and isotropic exchange interactions. It follows that eigenenergies and eigenstates are expressible within an extension of the prime field ℚ of rationals of degree $2^3$ and $2^4$, respectively. In quantum information setting, each real extension of rank 2 represents an arithmetic qubit. We demonstrate in detail some actions of the Galois group on the eigenproblem.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1111-1114
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
About some problems related to determination of the e.g. Biot coefficient for rocks
Autorzy:
Nowakowski, Andrzej
Nurkowski, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/1853903.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
współczynnik Biota
ściśliwość
porowatość
poroelasticity
Biot medium
Biot coefficient
effective compressibility modulus
rock skeleton compressibility modulus
Opis:
Use of the poroelasticity theory by Biot in the description of rock behaviour requires the value of the e.g. Biot coefficient α to be determined. The α coefficient is a function of two moduli of compressibility: the modulus of compressibility of the rock skeleton Ks and the effective modulus of compressibility K. These moduli are determined directly on the basis of rock compressibility curves obtained during compression of a rock sample using hydrostatic pressure. There is also a concept suggesting that these compressibility moduli might be determined on the basis of results of the uniaxial compression test using the fact that, in the case of an elastic, homogeneous and isotropic material, the modulus of compressibility of a material is a function of its Young modulus and its Poisson ratio. This work compares the results obtained from determination of the Biot coefficient by means of results of compressibility test and uniaxial compression test. It was shown that the uniaxial compression test results are generally unsuitable to determine the value of the coefficient α. An analysis of values of the determined moduli of compressibility shows that whereas the values of effective moduli of compressibility obtained using both ways may be considered as satisfactorily comparable, values of the relevant rock skeleton moduli of compressibility differ significantly.
Źródło:
Archives of Mining Sciences; 2021, 66, 1; 133-150
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gamma Radiation Absorption Characteristics of Concrete with Components of Different Type Materials
Autorzy:
Stanković, S.
Ilić, R.
Janković, K.
Bojović, D.
Lončar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1537948.pdf
Data publikacji:
2010-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.41.Qb
29.25.Rm
29.27.Eg
29.85.-c
Opis:
Nuclear facilities as nuclear power stations, nuclear research reactors, particle accelerators and linear accelerator in medical institution using concrete in building construction. The different type materials of the aggregate as component of concrete were analyzed to provide radiation protection. The energy deposited the transmission factor and the mass attenuation coefficients in ordinary and barite concretes have been calculated with the photon transport Monte Carlo software. The numerical simulations results show that using barite as an aggregate in the concrete is one of the solutions for gamma ray shielding. Thereat, it is shown non-destructive method for determining the gamma radiation absorption characteristics of concrete.
Źródło:
Acta Physica Polonica A; 2010, 117, 5; 812-816
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ligand-Framework Coupling Vibrations. The ^2E_g → ^4A$\text{}_{2g}$ Transition in the Cr(CN)_6$\text{}^{3-}$ Complex Ion
Autorzy:
Acevedo, R.
Passman, M.
Navarro, G.
Powiązania:
https://bibliotekanauki.pl/articles/2024002.pdf
Data publikacji:
2001-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.Fw
32.70.Cs
Opis:
In this research paper we examine the role played by the bending vibrational modes of motion, δ(Cr-C-N) to influence the observed overall and relative vibronic intensity distribution for the $\text{}^{2}$E$\text{}_{g}$ → $\text{}^{4}A_{2g}$ phosphorescence of the Cr(CN)$\text{}_{6}^{3-}$ complex ion. The calculation was carried out assuming both: (a) a seven-atom system model (molecular approximation) and (b) a negligible distortion from the octahedral symmetry for the system. The ligand polarization formalism was employed with reference to this system, since the ligand subsystems (CN)$\text{}^{-1}$ are highly polarizable and as a consequence a conventional crystal field calculation would be both unrealistic and unappropriate. This system was chosen since there is a solid evidence to conclude that vibrations of the same type in the τ$\text{}_{1u}$ and τ$\text{}_{2u}$ symmetry blocks induce comparable intensity. This is a clear indication that both the τ$\text{}_{1u}$ and τ$\text{}_{2u}$: δ(Cr-C-N) bending vibrations are exceptionally efficient to promote this radiative transition. This dynamical model is tested against the experimental data and it is shown that the model calculation, though approximate, gives results in excellent agreement with experiment.
Źródło:
Acta Physica Polonica A; 2001, 99, 2; 215-231
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of an Acceleration Gap for Brightness Enhancement in a Reactor-Based Slow Positron Beamline
Autorzy:
Kuzuya, Y.
Oshima, N.
Kinomura, A.
Yabuuchi, A.
Powiązania:
https://bibliotekanauki.pl/articles/1033247.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
41.75.Fr
29.27.Eg
41.85.Ja
Opis:
Design of an acceleration gap using mesh electrodes of the brightness enhancement system for the slow positron beamline of Kyoto University research reactor was studied to improve the performance of brightness enhancement. The transmittance and the increase in the angular divergence of the beam resulting from acceleration with the mesh electrode were estimated by trajectory simulations. The effect of the increase in the beam emittance on the beam radius at the focus point was estimated based on the analytical solution of the beam envelope equation. Using the obtained beam transmittance and beam radius, the beam brightness after remoderation was evaluated. Then, the influence of the mesh electrode configuration on the brightness was investigated.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1620-1623
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sarkocystoza u samca krzyżówki Anas platyrhynchos
Sarcocystosis in a male of the Mallard Anas platyrhynchos
Autorzy:
Flis, M.
Grela, E.G.
Powiązania:
https://bibliotekanauki.pl/articles/79505.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Zoologiczne
Tematy:
ptaki wodne
dzikie kaczki
kaczka krzyzowka
Anas platyrhynchos
samce
inwazja pasozytnicza
pasozyty zwierzat
choroby pasozytnicze
sarkocystoza
Źródło:
Ornis Polonica; 2018, 59, 1
2081-9706
Pojawia się w:
Ornis Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 139

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