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Tytuł:
Kontrowersje związane z reklamowaniem leków Analiza porównawcza Polski i Stanów Zjednoczonych
Controversial Advertising of Medicines. A Comparison between Poland and the United States
Autorzy:
Makowska, Marta
Powiązania:
https://bibliotekanauki.pl/articles/965175.pdf
Data publikacji:
2016-09-15
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
pharmaceutical industry
advertisement
drugs
law
ethics
I18
M31
M38
Opis:
For many years, the subject of aggressive marketing campaigns conducted by pharmaceutical companies has been raised in Poland. Drug ads are everywhere, on television, the radio, magazines and on the Internet. Therefore, it is extremely important is to ensure both their legal and ethical dimension. In my article I will present the differences between direct-to-consumer advertising of medicines in Poland and in the US. The dissimilarities result mainly from differences in legislation. In Poland the law is much stricter than in the US. For example, in the United States companies are allowed to advertise prescription drugs directly to patients. In the whole of the European Union, and thus in Poland, it is strictly prohibited. The article will present other regulations existing in Poland and in the United States and it will compare them. It will show examples of violations of the law and ethics in the advertising of medicine in both countries. It will briefly outline the negative consequences of unacceptable pharmaceutical marketing.
Źródło:
Annales. Etyka w Życiu Gospodarczym; 2016, 19, 3
1899-2226
2353-4869
Pojawia się w:
Annales. Etyka w Życiu Gospodarczym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Susceptibility testing of Aspergillus niger strains isolated from poultry to antifungal drugs - a comparative study of the disk diffusion, broth microdilution (M 38-A) and Etest methods
Autorzy:
Tokarzewski, S.
Ziolkowska, G.
Nowakiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/32075.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
susceptibility
Aspergillus niger
isolation
poultry
antifungal drug
disk diffusion
broth microdilution method
disc-diffusion method
Etest procedure
aspergillosis
fungal infection
respiratory tract
Opis:
The aim of this study was to determine the sensitivity of Aspergillus niger strains isolated from birds to available antifungal drugs using different in vitro assays - classical disk diffusion, Etest® and broth microdilution NCCLS/CLSI M 38-A. The study material consisted of about 2.000 swabs and samples from different species of birds. A. niger (n=10) was accounted for 6.81% of the total pool of strains isolated. Determinations were made for 13 antifungal drugs using the disk diffusion method. The A. niger exhibited high susceptibility to enilconazole, terbinafine, voriconazole, tioconazole and ketoconazole, low susceptibility to clotrimazole, miconazole and nystatin, and resistance to amphotericin B, itraconazole, pimaricin, fluconazole and 5-fluorocytosine. Minimum inhibitory concentration (MIC) was determined for 9 antifungal drugs using the micromethod of duplicate serial dilutions in a liquid medium. A. niger strains were most susceptible to enilconazole and voriconazole. MIC ranged from 0.0625 to 0.5 μg/ml for enilconazole, with MIC90-0.5 μg/ml and MIC50-0.125 μg/ml. The corresponding values for voriconazole were 0.25-1 μg/ml, 1 μg/ml and 0.5 μg/ml. MIC for amphotericin B and terbinafine ranged from 0.5 to 4 μg/ml, while the values for the remaining drugs were highly varied. MIC was measured by the gradient diffusion method using Etest® for 5 antifungal drugs: amphotericin B, fluconazole, itraconazole, ketoconazole and voriconazole. By far the highest susceptibility was obtained in the case of voriconazole, with MIC ranging from 0.0625 to 1 μg/ml. MIC for amphotericin B ranged from 0.25 to 4 μg/ml, for itraconazole and ketoconazole ranging from 0.5 to 16 μg/ml. Methods available for this purpose are not always applicable in field conditions. The present results indicate that the Etest® technique, due to its high percentage of agreement with the M 38-A microdilution method, should find application in medical and veterinary practice.
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kb ppanc. wz. 35 : kb sp wz. 38 M, pm Mors wz. 39
Autorzy:
Mackiewicz, Michał.
Współwytwórcy:
Edipresse Polska. pbl
Data publikacji:
2014
Wydawca:
Warszawa : Edipresse Polska
Tematy:
Karabiny automatyczne Polska 1918-1939 r.
Pistolety maszynowe Polska 1918-1939 r.
Rusznice przeciwpancerne Polska 1918-1939 r.
Mors (pistolet) budowa i konstrukcje Polska 1918-1939 r.
Wydawnictwa popularne
Opis:
Tyt. okł. i grzb.: Kb wz. 35, kb wz. 38 M, pm wz. 39.
Bibliogr. s. 55.
Dostawca treści:
Bibliografia CBW
Książka
Tytuł:
Polaron Problem in Quantum Wells
Autorzy:
Bardyszewski, W.
Prywata, M.
Powiązania:
https://bibliotekanauki.pl/articles/1934053.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ey
71.38.+i
73.20.Dx
Opis:
The effect of polar interaction between an electron in a quantum well and bulk longitudinal optical phonons is analysed. Electron spectral density function is calculated in the lowest order cumulant approximation. The position and linewidth of the quasiparticle peak are obtained as a function of quantum well width and temperature.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 969-973
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shallow-Deep Instability of Donor States in Many-Valley Semiconductors
Autorzy:
Grinberg, M.
Powiązania:
https://bibliotekanauki.pl/articles/1890895.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.-i
71.38.+i
Opis:
The shallow-deep instability of double and single donors in multi-valley semi conductors using the model Hamiltonian is studied. The obtained results describe properly the properties of double donors (in D$\text{}^{0}$ and D$\text{}^{+}$ state) in Ge and single deep donors in Al$\text{}_{x}$Ga$\text{}_{1-x}$As for 0.3 < x < 0.5.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 361-364
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przetargi na częstotliwości WiMAX z zakresu 3,6-3,8 GHz
Auctions for WiMAX frequencies from the range 3,6-3,8 GHz
Autorzy:
Półtorak, M.
Powiązania:
https://bibliotekanauki.pl/articles/154219.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
IEEE 802.16
Internet
ADSL
WiMAX Forum
WiBro
WiMAX forum
Opis:
Tematem referatu jest problematyka dostępu do Internetu na obszarach o słabo rozbudowanej infrastrukturze teleinformatycznej oraz zasady organizacji przetargów i przydziałów częstotliwości wykorzystywanych dla budowy bezprzewodowych sieci dostępu do Internetu WiMAX budo-wanych z wykorzystaniem częstotliwości z zakresu 3,6-3,8 GHz. Na bazie zakończonych przetargów na obszarach przetargowych 08.1 i 08.2 położo-nych na obszarze województwa lubuskiego przedstawiono etapy realizacji zobowiązań zadeklarowanych w ofertach przetargowych. Przetargi te organizowane były przez Prezesa Urzędu Komunikacji Elektronicznej.
The subject of this paper is the access to the Internet on areas where telecommunication infrastructure is poor as well as the rules of organizing auctions on assignment of frequencies from 3,6-3.8 GHz range which can be used for building wireless broadband networks based on WiMAX technology. In the latest years the term "broadband networks" describes a new generation technology of high speed data transmission [2]. Such high speed data transmission is possible by using both wire and wireless networks (Section 2.) The WiMAX wireless technology can be widely used in Poland (Subsection 2.1.). Data from the European Union show that at the beginning of the year 2008 (Fig. 1) Poland was one of the countries which had the lowest index of access to the broadband services [6]. Poland can improve this situation by using frequencies from 3,6-3,8 GHz range to build wireless broadband networks. The President of the Office of Electronic Communications (UKE) offered these frequencies on auctions organized on 60 areas in Poland (Fig.2.), 2 of which were situated in Lubuskie Woivodeship (Subsection 4.2.). As a consequence, the assignment of frequencies on the auction area 08.1 went to Gorzów Wlkp., while on the auction area 08.2 to Zielona Góra. According to the auction documents both cities are obliged to carry out the network building in a committed term (Subsection 4.4.). On one hand, building broadband networks with broadband access to the Internet by using the WiMAX technology gives the unique opportunity to improve a situation on the area where telecommunication infrastructure is poor and, on the other hand, it gives possibility to exploit financial help from the European Union up to 85% of expenses.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 7, 7; 544-547
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhanced production, purification and characterization of alkaline keratinase from Streptomyces minutiscleroticus DNA38
Autorzy:
Allure, N.
D.N., M
Agsar, D.
Powiązania:
https://bibliotekanauki.pl/articles/11176.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
A thermo tolerant, feather-degrading, newly isolated actinobacterial strain Streptomyces minutiscleroticus DNA38 was investigated for its ability to produce keratinase. Maximum production (283.4 IU) of keratinase by Streptomyces minutiscleroticus DNA38 in starch chicken feathers medium under submerged bioprocess was observed at optimized conditions of pH 9.0 of the medium and 45 °C incubation temperature. Further, an enhanced production (435.8 IU) of keratinase was achieved employing response surface methodology. Combined interactive effect of starch (7.50 g/L), yeast extract (0.74 g/L) and chicken feathers (7.50 g/L) were found to be the critical process variables for enhanced production under central composite design. Chicken feathers showed a direct action and addition of starch and yeast extract to the medium proved effective for a significant increase in the production of keratinase. The purified keratinase was monomeric and had a molecular mass of 29 kDa. The enzyme activity was significantly inhibited after pH 9.0 and temperature 50 °C.
Źródło:
International Letters of Natural Sciences; 2015, 43
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scattering of Excitons by Phonons in Quantum Wells
Autorzy:
Bardyszewski, W.
Prywata, M.
Powiązania:
https://bibliotekanauki.pl/articles/1947245.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
71.38.+i
72.80.Ey
Opis:
A method to describe the effects of the exciton-optical phonon interaction is presented using the cumulant expansion approximation. The functional-integral technique of coherent phonon states is used in order to justify the commonly used model Hamiltonian and generate the proper perturbation series. The influence of the mutual electron-hole screening on the polaronic effects in quantum wells is analyzed.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 715-718
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena zgodności telekomunikacyjnych terminali głosowych według normy TBR 38
The voice telecommunication terminals conformity assessment according to the TBR 38
Autorzy:
Trzaskowska, M. J.
Powiązania:
https://bibliotekanauki.pl/articles/317492.pdf
Data publikacji:
2006
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
telefonometria
jakość usługi głosowej
Centralne Laboratorium Badawcze IŁ
telephonometry
voice quality of service
Central Research Laboratory of NIT
Opis:
Opisano procedury badawcze do przeprowadzania kompleksowych pomiarów parametrów głosowych terminali telekomunikacyjnych, zgodnie z dokumentem europejskim TBR 38, według dyrektywy UE 1999/5/EC. Procedury te zostały wdrożone w Centralnym Laboratorium Badawczym Instytutu Łączności w Warszawie.
Research procedures aimed at carrying out complex measuring of telecommunication voice terminal parameters accordance to the paper TBR 38 and EU directive 1999/5/EC. These procedures have been implemented in the Central Research Laboratory of National Institute of Telecommunications (NIT).
Źródło:
Telekomunikacja i Techniki Informacyjne; 2006, 1-2; 102-108
1640-1549
1899-8933
Pojawia się w:
Telekomunikacja i Techniki Informacyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Induction of hemolysis and eryptosis by occupational pollutant nickel chloride is mediated through calcium influx and p38 MAP kinase signaling
Autorzy:
Alfhili, Mohammad A.
Alamri, Hassan S.
Alsughayyir, Jawaher
Basudan, Ahmed M.
Powiązania:
https://bibliotekanauki.pl/articles/2085691.pdf
Data publikacji:
2022-02-15
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
calcium
p38 MAPK
oxidative stress
hemolysis
nickel
eryptosis
Opis:
ObjectivesNickel (Ni) is an abundant environmental hazard and an occupational pollutant. Exposure to Ni compounds is prevalent in electroplating workers and in the printing industry, among others. The toxicity of Ni manifests as dermatological, gastrointestinal, respiratory, allergic, and cardiovascular symptoms. In particular, hyperbilirubinemia and reticulocytosis have been detected in intoxicated subjects; an observation possibly implicating selective red blood cell (RBC) toxicity. Herein, the interaction of nickel chloride (NiCl2) with human RBCs and associated molecular mechanisms are described.Material and MethodsCells from healthy donors were incubated for 24 h at 37°C in the presence or absence of 0.5‒10 mM of NiCl2, and cytotoxicity was determined through hemoglobin leakage by colorimetry under different experimental conditions. Eryptotic markers were also identified by flow cytofluorometry using Annexin-V-FITC tagging for phosphatidylserine (PS) exposure, light scatter properties for cellular dimensions, Fluo4/AM labeling for intracellular calcium, and H2DCFDA staining for reactive oxygen species (ROS). Additionally, small molecule inhibitors were used to probe the signaling pathways involved.ResultsIt was found that NiCl2 at 10 mM caused profound intracellular calcium overload and significant calcium-dependent hemolysis. Also, NiCl2 reduced forward scatter and increased side scatter, Annexin-positive cells, and ROS levels. Importantly, NiCl2-induced hemolysis was significantly attenuated by the exclusion of extracellular calcium, and in the presence of p38 MAP kinase (MAPK) inhibitor SB203580.ConclusionsIt is concluded that NiCl2 induces p38 MAPK-dependent hemolysis, and stimulates the canonical features of premature eryptosis. This report presents the first description of the molecular mechanisms underlying the hemolytic and eryptotic potential of NiCl2 and, thus, may explain changes in hematological parameters observed in poisoning victims.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2022, 35, 1; 1-11
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of a Melt-Textured Pellet of $(Nd_{0.33}Eu_{0.38}Gd_{190.28})Ba_2Cu_3O_y$ + 0.035 mol% Zn
Autorzy:
Jirsa, M.
Rameš, M.
Muralidhar, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813616.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
74.60.Ge
Opis:
Recently, a striking positive effect of tiny Zn doping on crystal growth quality has been found in melt-textured $(Nd, Eu, Gd)Ba_2Cu_3O_y$ pellets. The material could be easily grown from MgO seed, possessing a rather high lattice mismatch to the superconducting compound. In the present work we study spatial distribution of local magnetic properties and chemical composition of a $(Nd_{0.33}Eu_{0.38}Gd_{0.28})Ba_2Cu_3O_y$ + 0.035 mol% Zn pellet. The plane cutting the pellet into two halves along the symmetry axes of the opposite a-axis growth sectors is investigated. While the chemical composition only slightly fluctuates, magnetic properties show quite an interesting spatial variation.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 223-226
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technologia budowy mostu M1 nad Wisłą w Krakowie
Autorzy:
Ostrzołek, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/32443886.pdf
Data publikacji:
2023
Wydawca:
Nowoczesne Budownictwo Inżynieryjne
Tematy:
most kolejowy
Kraków
M1
Opis:
W Krakowie w ramach modernizacji linii kolejowej E30 na odcinku Kraków Główny Towarowy – Rudzice został rozebrany sześcioprzęsłowy, dwutorowy most kolejowy. W jego miejscu powstał nowy obiekt M1. Autorem koncepcji architektoniczno-konstrukcyjnej nowego mostu jest Bogusław Pilujski, a projektantem Radosław Sęk. Prace budowlane zostały zrealizowane przez STRABAG Sp. z o.o. na zlecenie PKP PLK S.A.
Źródło:
Nowoczesne Budownictwo Inżynieryjne; 2023, 1; 34-38
1734-6681
Pojawia się w:
Nowoczesne Budownictwo Inżynieryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biological Action in and out of the Water Window
Autorzy:
Vyšín, L.
Davídková, M.
Wachulak, P.
Fiedorowicz, H.
Bartnik, A.
Krůs, M.
Kozlová, M.
Skála, J.
Dostál, J.
Dudžák, R.
Juha, L.
Powiązania:
https://bibliotekanauki.pl/articles/1029783.pdf
Data publikacji:
2018-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.14.G-
52.38.-r
Opis:
This study is dealing with the difference of radiation chemical yields of single and double strand breaks induced in plasmid DNA by photons inside and outside of the soft X-ray water window, i.e., in the wavelength range from 2.28 nm to 4.88 nm. Photons were generated by various plasma sources providing nanosecond and sub-nanosecond pulses of extreme ultraviolet, soft X-ray and X-ray radiation. DNA strand breaks were determined by agarose gel electrophoresis. Higher radiation chemical yields of both single and double strand breaks were found using picosecond and nanosecond sources of extreme ultraviolet and X-ray radiation.
Źródło:
Acta Physica Polonica A; 2018, 133, 2; 236-238
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Binding Energy of a Bound Polaron in a Quantum Well Wire
Autorzy:
Bouhassoune, M.
Charrour, R.
Fliyou, M.
Bria, D.
Nougaoui, A.
Powiązania:
https://bibliotekanauki.pl/articles/2014080.pdf
Data publikacji:
2000-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.38.+i
73.20.Dx
73.20.Hb
73.20.Fz
Opis:
Theoretical study of the binding energies of an off-center donor hydrogenic impurity in a cylindrical quantum well wires semiconductor is presented. Calculations are performed in the framework of the effective mass approximation using the variational approach. We describe the effect of the quantum confinement by an infinitely deep potential well and we take into consideration the interaction between the charge carrier (electron and ion) and the optical phonons (confined longitudinal optical and surface optical). Our results show that the impurity binding energy depends strongly on the spatial confinement, the impurity position and the polaronic corrections.
Źródło:
Acta Physica Polonica A; 2000, 98, 1-2; 111-122
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physics of Neutral-to-Ionic Phase Transition in Organic Charge Transfer Semiconducting Compounds
Autorzy:
Cailleau, H.
Lemée-Cailleau, M. H.
Le Cointe, M.
Luty, T.
Powiązania:
https://bibliotekanauki.pl/articles/1967953.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.38.+i
61.50.Ks
71.35.Aa
Opis:
An uncommon excitonic instability takes place in some exotic semiconducting compounds. Indeed, the equilibrium neutral-to-ionic (N-I) phase transition, as well as the non-equilibrium photo-induced phase transformation, observed in some organic charge-transfer complexes, originate from intra- and inter-chain cooperative effects between structurally relaxed charge-transfer excitations. This electronic-structural phase transition manifests itself by a change of the degree of charge-transfer and a dimerization distortion with the formation of donor-acceptor pairs along the stacking axis in the I phase. Thermal charge-transfer excitations associated with the formation of I strings along N chains are at the heart of the mechanism of this phase transition. These relaxed electronic excitations, which are an intrinsic feature of low-dimensional systems with strong electron-phonon coupling, can be described in terms of self-trapping and self-multiplication of charge-transfer excitons. Precise structural studies on the prototype compound, tetrathiafulvalene-p-chloranil allow to highlight the respective role taken by the ionicity and the dimerization. Symmetry and thermodynamics analysis of the N-I transition, based on recent determination of the pressure-temperature phase diagram, make possible to present a consistent picture of this phase transition. Supported by theoretical considerations taking into account the interplay between quantum and thermal effects, the experimental observations show that the N-I transition results from the condensation and the ordering (crystallization) of charge-transfer excitations, following a phase diagram analogous to the solid-liquid-gas one.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 597-608
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polaron Effect on the Binding Energy of Shallow Donor in Cylindrical Quantum Dot
Autorzy:
Charrour, R.
Bouhassoune, M.
Bria, D.
Nougaoui, A.
Fliyou, M.
Powiązania:
https://bibliotekanauki.pl/articles/2011186.pdf
Data publikacji:
1999-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.38.+i
73.20.Dx
73.20.Hb
Opis:
In the framework of the effective-mass approximation and the modified Lee-Low-Pines variational method, we present a theoretical study of the effect of the confined longitudinal-optical phonon and two types of surface-optical phonon (top and side mode) on the binding energy of shallow donor in cylindrical quantum dot. The effect of quantum confinement is described by an infinitely deep potential well. The impact of these different phonon modes is important and depends on the dimension of the quantum dot.
Źródło:
Acta Physica Polonica A; 1999, 96, 6; 759-768
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Accuracy Improvement of a Photoacoustic Helmholtz Cell Model
Autorzy:
Suchenek, M.
Opalski, L.
Powiązania:
https://bibliotekanauki.pl/articles/1198566.pdf
Data publikacji:
2014-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.20.Ks
43.20.Wd
43.30.Zk
43.38.Zp
Opis:
This paper presents a method for improving accuracy of the frequency response of a photoacoustic Helmholtz cell model. The method generates simple non-linear corrections to well-established (reference) delay line model of the cell. The form of the correction functions is obtained from a study of a numerical fitting of the reference model to the measurement data. A novel integral accuracy measure is formulated to compare fit of cell models to actual measurements in the neighborhood of the resonance frequency, which is important for measurement applications of the cell. The two proposed correction functions modify effective values of duct parameters. Despite simplicity the proposed corrections make significant improvement of modeling accuracy, as shown with the integral measure but also with prediction accuracy of the resonance frequency and the cell quality factor. It is significant that substantial accuracy gain due to the corrections was confirmed with measurements of a second (testing) set of photoacoustic Helmholtz cells with geometrical parameter values which are different from these of the first set.
Źródło:
Acta Physica Polonica A; 2014, 125, 5; 1132-1137
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Subjective Evaluation of Directional Properties of Loudspeaker Systems with the Analog and Digital Crossover Networks
Autorzy:
Niewiarowicz, M.
Galiński, T.
Powiązania:
https://bibliotekanauki.pl/articles/1400067.pdf
Data publikacji:
2013-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.38.+n
43.66.+y
Opis:
The aim of this study was to determine the way in which loudspeaker systems with the analog and digital crossover networks were subjectively evaluated. The object of the study were two loudspeaker systems, differing in both the position of speakers on the front panel of enclosure and configuration of the crossover networks: 2.5-way and 3-way systems with the slope of frequency response of 12 dB/octave in the cut-off regions. The investigations were conducted for 5 angles from the front hemisphere in the horizontal plane. Test signals were fragments of music and speech. The recordings of these signals were conducted in an anechoic chamber using an artificial head and then presented to the listeners through headphones. Five normally-hearing listeners aged 18-50 years took part in the experiment. Listening tests were carried out in two stages. In the first stage listeners were listening to test signals grouped in triads and their task was to identify pairs of signals the most and the least similar to each other. In the second stage a parametric evaluation was performed. It consisted in assigning five numbers, corresponding to the intensity of the attribute of perception space (evaluated on a scale of 0-10) to each of test signals. The attributes of perception space included: sharpness, clearness, fullness, lack of distortions and loudness. Using the method of multidimensional scaling and correlation analysis it was possible to relate a particular dimension of the multidimensional space to the attributes of the perception space. It was found that the intrinsic attributes responsible for the subjective evaluation of loudspeaker systems with the analog and digital crossover network were sharpness, clearness and loudness.
Źródło:
Acta Physica Polonica A; 2013, 123, 6; 974-979
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Residual stresses assessment in the marine diesel engine crankshaft 12V38 type
Autorzy:
Król, K.
Wikło, M.
Olejarczyk, K.
Kołodziejczyk, K.
Siemiątkowski, Z.
Żurowski, W.
Rucki, M.
Powiązania:
https://bibliotekanauki.pl/articles/244853.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diesel engine
crankshaft
simulation
residual stress
Opis:
In the paper, the measurement of the marine diesel engine crankshaft residual stresses is presented. The hole drilling strain gauge was chosen because of its simplicity and low cost. Moreover, deflection calculation was made for the load corresponding to its weight and the concentrated force in the chosen bearing conditions. Deflection of the journal and bending rigidity under the concentrated force was calculated as well. In that case, the crankshaft was supported in the neighbouring crank journals. The reduced stresses were calculated according to the Huber – Mises hypothesis. The residual stresses were measured in the marine diesel engine crankshaft type 12V38 after the finishing, with the hole-drilling method. It was found that the residual stresses reach the maximal value of 86 MPa, but for 50% of measuring points, the residual stresses did not exceed the value of 20 MPa. The squeezing stresses were found to be dominant. The measurement results provided important data for further consideration, especially for the correction of the bending deformation of the produced crankshaft.
Źródło:
Journal of KONES; 2017, 24, 2; 117-123
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eternal m-Security Bondage Numbers in Graphs
Autorzy:
Aram, Hamideh
Atapour, Maryam
Sheikholeslami, Seyed Mahmoud
Powiązania:
https://bibliotekanauki.pl/articles/31342245.pdf
Data publikacji:
2018-11-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
eternal m -secure set
eternal m -security number
eternal m- security bondage number
Opis:
An eternal m-secure set of a graph $ G = (V,E) $ is a set $ S_0 \subseteq V $ that can defend against any sequence of single-vertex attacks by means of multiple guard shifts along the edges of $ G $. The eternal m-security number $ \sigma_m (G) $ is the minimum cardinality of an eternal m-secure set in $G$. The eternal m-security bondage number $ b_{\sigma_m} (G) $ of a graph $G$ is the minimum cardinality of a set of edges of $G$ whose removal from $G$ increases the eternal m-security number of $G$. In this paper, we study properties of the eternal m-security bondage number. In particular, we present some upper bounds on the eternal m-security bondage number in terms of eternal m-security number and edge connectivity number, and we show that the eternal m-security bondage number of trees is at most 2 and we classify all trees attaining this bound.
Źródło:
Discussiones Mathematicae Graph Theory; 2018, 38, 4; 991-1006
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of PVD coatings manufactured on X38CrMoV5-1 steel for plastic moulding applications
Autorzy:
Gołąbczak, M.
Pawlak, W.
Szymański, W.
Jacquet, P.
Fliti, R.
Powiązania:
https://bibliotekanauki.pl/articles/100117.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
X38CrMoV5-1 steel
PVD technology
TiC+a-C:H coating
MoS2TiW coating
friction coefficient
nanohardness
Opis:
In plastics moulding industry a lot of parts sustain in relative movement: ejectors, slides, dies, etc. Some seizing or micro-welding may appear, especially when lubrication is not used. In this paper, PVD coatings have been obtained thanks to hybrid Cathodic Arc Evaporation system. Several properties of the coatings have been investigated such as chemical composition, microstructure, friction coefficient at ambient and high temperature conditions, nanohardness and their modulus of elasticity.
Źródło:
Journal of Machine Engineering; 2012, 12, 2; 37-45
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EUV-Induced Nanostructuring of Solids
Autorzy:
Bartnik, A.
Fiedorowicz, H.
Jarocki, R.
Kostecki, J.
Szczurek, A.
Szczurek, M.
Wachulak, P.
Powiązania:
https://bibliotekanauki.pl/articles/1490097.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.38.Ph
82.50.Kx
81.40.Wx
Opis:
In this work results of investigations concerning nanostructuring of polymers and some other solids using a laser-plasma extreme ultraviolet source are presented. The plasma radiation was produced using a gas puff target and focused with a gold-plated grazing incidence ellipsoidal collector. Decomposition process of polymers was investigated using a quadrupole mass spectrometer. Different kinds of micro- and nanostructures created in near-surface layers of the materials were investigated using scanning electron microscope. Forms of the structures depend on a particular material and the extreme ultraviolet exposure. In case of some polymers even a single shot is sufficient for creation of the visible changes in surface morphology. In case of inorganic solids visible changes require usually the exposure with tens or hundreds of extreme ultraviolet pulses.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 445-449
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanostructured Thin Films β-Al-Mg Obtained Using PLD Technique
Autorzy:
Radziszewska, A.
Kąc, S.
Feuerbacher, M.
Powiązania:
https://bibliotekanauki.pl/articles/1537943.pdf
Data publikacji:
2010-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
68.55.Nq
81.15.-z
52.38.Mf
Opis:
In this work, the pulsed laser deposition (PLD) technique was used to grow AlMg thin films from a $β-Mg_{2}Al_{3}$ target with nominal composition: 39.09 at.% Mg and 60.91 at.% Al. The paper presents the study of $β-Mg_{2}Al_{3}$ thin films deposited using the pulsed laser deposition technique. AlMg thin films were prepared on Si (400) substrates and deposited by means of using a QS-Nd:YAG laser (λ = 266, 355 nm). Samples were prepared with laser fluence (1.1 J/$cm^{2}$ and 1.6 J/$cm^{2}$) and at two different substrate (Si) temperatures (25°C and 200°C). The target possessed columnar structure and changes in chemical composition took place as a result of the influence of the laser irradiation. Investigations focused on structure and chemical composition showed that the films generally had nanocrystalline structure and that the quantity of Al and Mg varied in the films.
Źródło:
Acta Physica Polonica A; 2010, 117, 5; 799-802
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic analysis of 38 double-flowered amaryllis (Hippeastrum hybridum) cultivars based on SRAP markers
Autorzy:
Xiong, M.
Yang, S.
Wang, Y.
Chen, D.
Wang, X.
Zhou, D.
Wei, Z.
Powiązania:
https://bibliotekanauki.pl/articles/12994499.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2021, 20, 3; 15-25
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza struktury złącza PA38/AZ31 wytworzonego metodą zgrzewania dyfuzyjnego
Structural analysis of the PA38/AZ31 joint fabricated by diffusion bonding
Autorzy:
Mola, R.
Cieślik, M.
Bartos, J.
Powiązania:
https://bibliotekanauki.pl/articles/195303.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
stop magnezu
stop aluminium
strefa złącza
fazy międzymetaliczne
struktura
mikrotwardość
magnesium alloy
aluminium alloy
bonding zone
intermetallic phases
structure
microhardness
Opis:
W artykule przedstawiono analizę struktury złącza stop aluminium (PA38)–stop magnezu (AZ31) wytworzonego metodą zgrzewania dyfuzyjnego. Za pomocą mikroskopu optycznego i elektronowego mikroskopu skaningowego przeprowadzono szczegółowe badania metalograficzne. Skład chemiczny strefy złącza określono metodą mikroanalizy rentgenowskiej (EDS). Wykonano również pomiary mikrotwardości metodą Vickersa łączonych materiałów i strefy złącza. W wyniku procesu zgrzewania uzyskano trwałe połączenie. Strefa złącza, o grubości ok. 50 µm, miała budowę dwuwarstwową. Od strony stopu PA38 w złączu zidentyfikowano grubszą warstwę (ok. 40 µm) fazy międzymetalicznej Al3Mg2, od strony stopu AZ31 cieńszą warstwę (ok. 10 µm) fazy międzymetalicznej Mg17Al12. W mikrostrukturze strefy złącza od strony stopu PA38 na tle osnowy fazy Al3Mg2 stwierdzono obecność drobnych cząstek fazy Mg2Si. Od strony stopu AZ31, na tle fazy Mg17Al12, obserwowano lokalnie iglaste cząstki fazy Al-Mn-Si. Na podstawie pomiarów mikrotwardości stwierdzono, że strefa złącza zbudowana głównie z faz międzymetalicznych Mg-Al charakteryzuje się kilkukrotnie wyższą mikrotwardością w porównaniu z łączonymi stopami.
This paper presents the results of the microstructure investigation of the aluminium alloy (PA38) – magnesium alloy (AZ31) joint fabricated by diffusion bonding. The structure of the bonding zone was examined using optical microscopy and scanning electron microscopy. The chemical composition of the bonding zone was determined by energy dispersive X-ray microanalysis. The microhardness measurements of the alloys and the bonding zone was also conducted. As a result of the diffusion bonding process the alloys were joined together. The bonding zone with a thickness of about 50μm had two-layer structure. In the bonding zone the thicker layer (about 40μm) of Al3Mg2 intermetallic phase was observed on the PA38 alloy side. The thinner layer (about 10 μm) of Mg17Al12 intermetallic phase was observed on the AZ31 alloy side. In the area of the bonding zone close to the PA38 alloy fine particles of Mg2Si phase were found in the matrix of Al3Mg2. In the bonding zone close to the AZ31 alloy locally a needle-shaped particles of the Al-Mn-Si phase were observed over the Mg17Al12 phase matrix. The results of microhardness measurement revealed that the bonding zone composed mainly of Mg-Al intermetallic phases layers had much higher microhardness than the joined alloys.
Źródło:
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2018, z. 90 [298], 3; 367-376
0209-2689
2300-5211
Pojawia się w:
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A synthetic alloploid [2n=38] obtained from Brassica juncea [L.] Czern. x Brassica carinata Braun
Syntetyczny alloploid 2n=38 uzyskany w wyniku krzyzowania Brassica juncea [L.] Czer. x Brassica carinata Braun
Autorzy:
Mackowiak, M
Powiązania:
https://bibliotekanauki.pl/articles/68794.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Genetyki Roślin PAN
Tematy:
kapusta sarepska
krzyzowanie roslin
Brassica juncea
krzyzowanie miedzygatunkowe
genetyka roslin
mejoza
mieszance miedzygatunkowe
Brassica carinata
alloploidy syntetyczne
Źródło:
Genetica Polonica; 1994, 35, 4; 315-321
0016-6715
Pojawia się w:
Genetica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray Characterization of Films Formed by Pulsed Laser Deposition on Cold Substrates from YBaCuO Targets
Autorzy:
Pełka, J. B.
Paszkowicz, W.
Gierłowski, P.
Lewandowski, S. J.
Zieliński, M.
Barbanera, S.
Knapp, M.
Powiązania:
https://bibliotekanauki.pl/articles/2030707.pdf
Data publikacji:
2002-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.38.Mf
81.15.-z
68.55.-a
Opis:
Grazing-incidence X-ray diffraction supplemented with atomic force microscopy and secondary ion mass spectroscopy were applied to the characterization of films deposited by laser ablation on cold substrates from YBaCuO targets and subsequently irradiated with additional laser pulses of lower energy density. Evolution of X-ray diffraction pattern was observed as a function of irradiation dose. For the as-deposited films the pattern was typical of the amorphized solids. For the films irradiated with doses higher than the threshold, the pattern was enriched with the diffraction peaks, whose general features, like peak positions, widths and relative intensities were almost independent of the dose. The size of the crystallites was deduced from the peak widths to be not smaller than 12-16 nm. Comparison of the pattern with patterns of known phases indicates that, apart of the amorphous component, a structure with an admixture of some new metastable or high temperature phase(s) is formed during the process of pulsed laser annealing. The atomic force microscopy observations revealed that the surface roughness shows a pronounced minimum at low irradiation doses. The secondary ion mass spectroscopy investigation confirms that the strongest chemical changes (increase in concentration of yttrium and copper) due to irradiation with higher doses are observed in the near-surface film material.
Źródło:
Acta Physica Polonica A; 2002, 101, 5; 787-794
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic Investigations of Charge Transfer Salt VINΦ$\text{}_{2}$(TCNQ)$\text{}_{2}$
Autorzy:
Łapiński, A.
Świetlik, R.
Strzelecka, H.
Veber, M.
Powiązania:
https://bibliotekanauki.pl/articles/1933382.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.38.+i
78.30.Jw
78.40.-q
Opis:
VINΦ$\text{}_{2}$(TCNQ)$\text{}_{2}$ is a salt with two different, non-parallel TCNQ stacks. The polarized reflectance spectra from single crystals in the IR region 660-5200 cm$\text{}^{-1}$, the powder absorption spectra 400-45000 cm$\text{}^{-1}$ and FT-NIR Raman spectra of VINΦ$\text{}_{2}$(TCNQ)$\text{}_{2}$ are measured at room temperature. Moreover, the temperature dependence of powder absorption spectra in the frequency range 400-7900 cm$\text{}^{-1}$ are studied. The nature of electronic bands, the anisotropy of optical conductivity, the temperature dependence of some vibrational bands and the charge distribution on different TCNQ stacks are discussed.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 835-841
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamics of Pseudospin-Electron Model in the U=0 Limit
Autorzy:
Stasyuk, I. V.
Shvaika, A. M.
Tabunshchyk, K. V.
Powiązania:
https://bibliotekanauki.pl/articles/2013013.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
71.38.+i
77.80.Bh
63.20.Ry
Opis:
Analytical consideration of a pseudospin-electron model in the absence of electron correlations is presented. Pseudospin and electron number mean values, thermodynamic potential, pair correlation functions are obtained in the same self-consistent approximation. The possibility of either first or second order phase transitions between different uniform phases (bistability) as well as between the uniform and the chessboard one is shown. In the regime n=const, an instability with respect to phase separation can take place.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 411-414
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on Vibrations of a Cantilever Beam with Magnetorheological Fluid by Using the Acoustic Signal
Autorzy:
Snamina, J.
Sapiński, B.
Wszołek, W.
Romaszko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1490357.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.40.-f
46.70.De
43.38.+n
Opis:
The paper presents results of laboratory investigations of a vibrating three-layer cantilever beam with magnetorheological fluid. The goal of the study was to determine changes of the acoustic field around the vibrating beam caused by modifications of the magnetorheological fluid properties. The experimental studies have been carried out on a dedicated measuring stand. The construction of the measuring stand allows fixing one end of the beam in a holder attached to the moving part of the electrodynamic shaker. The magnetic field is produced by an external electromagnet. During the measurements the beam displacements and the acoustic pressure have been simultaneously registered. Frequency analysis of the registered signals has been carried out in 1/12 octave bands near the second natural frequency of the beam. The results reveal that the acoustic signal emitted by the vibrating beam decreases when the magnetic field is applied.
Źródło:
Acta Physica Polonica A; 2012, 121, 1A; A-188-A-190
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coupling between Electronic and Vibrational Excitations in Carbon Nanotubes Filled with $C_{60}$ Fullerenes
Autorzy:
Utko, P.
Ferone, R.
Krive, I.
Shekhter, R.
Jonson, M.
Monthioux, M.
Noé, L.
Nygård, J.
Powiązania:
https://bibliotekanauki.pl/articles/1492807.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.Fg
73.63.Kv
73.23.Hk
73.22.Lp
71.38.-k
Opis:
We investigate the low-temperature electron transport through $C_{60}$ peapods, which are carbon nanotubes encapsulating $C_{60}$ fullerenes. We find that the temperature dependence of the Coulomb blockade oscillations in peapod quantum dots deviates from conventional Breit-Wigner behavior, showing signatures of the Franck-Condon blockade of conductance. This indicates the presence of a coupling between electronic states and vibrational excitations. Unlike for suspended empty nanotubes, these are not intrinsic vibrational modes of the tube but mechanical vibrations of the encapsulated fullerenes that affect the electronic transport. Fullerene peapods thus emerge as a new class of nanoelectromechanical systems.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 839-841
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential benefits and threats arising from a plant-based diet
Korzyści i zagrożenia wynikające ze stosowania diety roślinnej
Autorzy:
Gąsiewska, M.
Janczar-Smuga, M.
Powiązania:
https://bibliotekanauki.pl/articles/29433483.pdf
Data publikacji:
2022
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Źródło:
Nauki Inżynierskie i Technologie; 2022, 1(38); 27-40
2449-9773
2080-5985
Pojawia się w:
Nauki Inżynierskie i Technologie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GMI Effect in Annealed $Fe_{40}Ni_{38}Mo_{4}B_{18}$ Microwires
Autorzy:
Komova, E.
Šidik, F.
Klein, P.
Varga, R.
Vazquez, M.
Powiązania:
https://bibliotekanauki.pl/articles/1367050.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
81.07.Bc
75.47.De
Opis:
Amorphous glass-coated microwires are ideal material for miniaturized applications for sensing the temperature, stress and magnetic field. One of the key parameters for future applications is their time and thermal stability. It has been shown that stability can be improved by using nanocrystalline materials that combine good soft magnetic properties of amorphous matrix with high structural stability of crystalline grains. Such nanocrystalline materials are usually obtained by annealing of amorphous precursor. In the given contribution, the influence of dc current annealing on the domain structure and GMI effect in amorphous and nanocrystalline $Fe_{40}Ni_{38}Mo_{4}B_{18}$ magnetic microwire has been studied. The annealing induces additional circular magnetic anisotropy, stress relief and structure homogenization. However, the increase of magnetostriction results in the decrease of GMI. Annealing at optimum crystallisation temperature results in an increase of the relative permeability due to the formation of the nanosized grains. Consequently, GMI amplitude is comparable to that of as-cast state.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 74-75
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eu-Doped Cerium Oxide Nanoparticles Studied by Positron Annihilation
Autorzy:
Thorat, A.
Ghoshal, T.
Morris, M.
Nambissan, P.
Powiązania:
https://bibliotekanauki.pl/articles/1338100.pdf
Data publikacji:
2014-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.Df
78.20.Ci
61.72.jd
12.38.Aw
78.70.Bj
Opis:
The defect characteristics of cerium oxide ($CeO_2$) nanoparticles prepared through a solvothermal process and doped by europium to different concentrations ([Eu] = 0, 0.1, 0.5, 1, ..., 50 wt%) were studied by positron lifetime and coincidence Doppler broadening measurements. The particle sizes estimated from X-ray diffraction showed a reducing trend with increasing doping concentration except an increase during [Eu] = 0.1-1 wt%. The latter effect is attributed to the reduction of $Ce^{4+}$ ions to $Ce^{3+}$ resulting into the release of vacancies and formation of $Ce^{3+}$-vacancy associates. The lattice parameter increased with the decrease in particle size. Quantum confinement effects were observed in optical absorption studies as increase of band gap in particles of sizes below 7-8 nm. The vacancy-type defects were investigated by positrons. A lifetime of 176 ± 4 ps less than 187-189 ps reported for positrons in bulk $CeO_2$ reveals trapping of positrons in vacancy-type defects within the nanocrystallites. The defect-specific positron lifetime is admixed with that at the crystallite surfaces and it increased due to vacancy agglomeration at higher doping concentrations. Coincidence Doppler broadening studies indicated positron annihilation in defects surrounded by oxygen ions and the S-W plot showed the effect of quantum confinement through a peak-like kink or shoulder in the plot. Optical absorption studies have supported this observation.
Źródło:
Acta Physica Polonica A; 2014, 125, 3; 756-759
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Creation of Nanostructures on Polymer Surfaces Irradiated with Extreme Ultraviolet Pulses
Autorzy:
Bartnik, A.
Fiedorowicz, H.
Jarocki, R.
Kostecki, J.
Szczurek, A.
Szczurek, M.
Powiązania:
https://bibliotekanauki.pl/articles/1807534.pdf
Data publikacji:
2009-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.38.Ph
82.50.Kx
81.40.Wx
Opis:
A laser-plasma extreme ultraviolet source equipped with grazing incidence and Mo/Si collectors was used for surface modification of selected polymers. Surface morphology after irradiation was investigated. Different forms of nanostructures were obtained depending on polymer and irradiation conditions.
Źródło:
Acta Physica Polonica A; 2009, 116, S; S-108-S-110
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dofinansowanie działalności zarządców infrastruktury kolejowej w ramach programu wieloletniego na gruncie art. 38a Ustawy o Transporcie Kolejowym
Autorzy:
Stolorz, M.
Powiązania:
https://bibliotekanauki.pl/articles/215452.pdf
Data publikacji:
2018
Wydawca:
Instytut Kolejnictwa
Tematy:
program wieloletni
umowa wieloletnia
ustawa o transporcie kolejowym
zarządcy infrastruktury
finansowanie infrastruktury
Opis:
W artykule przedstawiono problematykę zmian w systemie finansowania zarządców infrastruktury kolejowej, do którego wprowadzono instytucję programu wieloletniego i wykonującej go umowy wieloletniej. Obecne rozwiązania umożliwiają kompleksowe dofinansowywanie działalności operacyjnej zarządcy ze środków publicznych, w odróżnieniu od poprzednich, gdy jedynie skupiano się na działalności inwestycyjnej. Program wieloletni jest także sposobem zagwarantowania finansowania w dłuższym czasie, będąc pewnym wyłomem od zasady jednoroczności budżetu. Dzięki programowi oraz towarzyszącej umowie wieloletniej, zarządca ma gwarancję otrzymania środków publicznych, jednakże jego działania muszą pozostawać w zgodzie z umową. Umowa wieloletnia może być podpisana także między zarządcą i jednostką samorządu terytorialnego, jednakże nie jest ona obligatoryjna, co może to mieć negatywny wpływ na kolejową infrastrukturę regionalną. W artykule przedstawiono także ewolucję rozwiązań dotyczących finansowania zarządców infrastruktury kolejowej i pokrótce omówiono każde z nich.
Źródło:
Problemy Kolejnictwa; 2018, 181; 55-62
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reiters Polaron Wave Function Applied to a t_{2_g} Orbital t-J Model
Autorzy:
Wohlfeld, K.
Oleś, A.
Daghofer, M.
Horsch, P.
Powiązania:
https://bibliotekanauki.pl/articles/1810332.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
75.30.Ds
71.38.-k
72.10.Di
Opis:
Using the self-consistent Born approximation we calculate Reiter's wave function for a single hole introduced into the undoped and orbitally ordered ground state of the t-J model with $t_{2g}$ orbital degrees of freedom. While the number of excitations is similar to the spin t-J model for a given J/t, a distinct structure of the calculated wave function and its momentum dependence is identified suggesting the formation of a novel type of mobile polarons.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 110-113
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the Temperature Distribution of a Die Casting Mold of X38CrMoV5_1 Steel
Autorzy:
Majernik, J.
Podařil, M.
Powiązania:
https://bibliotekanauki.pl/articles/380463.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting process
simulation
temperature distribution
mould material
proces odlewania
symulacja
rozkład temperatury
masa odlewnicza
Opis:
Relatively cold die material comes into contact with the substantially higher temperature melt during the casting cycle, causing high thermal fluctuations resulting into the cyclic change of thermal field. The presented contribution is devoted to the assessment of the impact of temperature distribution on individual zones in the die volume. The evaluated parameter is the die temperature. It was monitored at two selected locations with the 1 mm, 2 mm, 5 mm, 10 mm and 20 mm spacing from the die cavity surface to the volume of cover die and ejector die. As a comparative parameter, the melt temperature in the middle of the runner above the measuring point and the melt temperature close to the die face were monitored. Overall, the temperature was monitored in 26 evaluation points. The measurement was performed using the Magmasoft simulation software. The input settings of the casting cycle in the simulation were identical to those in real operation. It was found, that the most heavily stressed die zones by temperature were within the 20 mm from the die face. Above this distance, the heat supplied by the melt passes gradually into the entire die mass without significant temperature fluctuations. To verify the impact of the die cooling on the thermal field, a tempering system was designed to ensure different heat dissipation conditions in individual locations. At the end of the contribution, the measures proposals to reduce the high change of thermal field of dies resulting from the design of the tempering channel are presented. These proposals will be experimentally verified in the following research work.
Źródło:
Archives of Foundry Engineering; 2019, 2; 107-112
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Album studiosorum Pedagogium Książęcego w Szczecinie (1576–1666), wyd. A. Borysowska, M. Gierke, Szczecin 2022
Autorzy:
Ptaszyński, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/30146436.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Źródło:
Przegląd Zachodniopomorski; 2023, 38; 547-549
0552-4245
2353-3021
Pojawia się w:
Przegląd Zachodniopomorski
Dostawca treści:
Biblioteka Nauki
Artykuł
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