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    Wyświetlanie 1-13 z 13
    Tytuł:
    Wielkie epidemie na przestrzeni wiekow
    Autorzy:
    Glab, H
    Kepa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/848136.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Tematy:
    antropologia
    historia medycyny
    choroby czlowieka
    choroby zakazne
    epidemie
    kila
    trad
    dzuma
    tyfus plamisty
    rozprzestrzenianie sie chorob
    Źródło:
    Wszechświat; 2010, 111, 04-06; 137-141
    0043-9592
    Pojawia się w:
    Wszechświat
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of performance of timber harvesting with the use of Highlander harvester
    Analiza wydajności harwestera Highlander przy maszynowym pozyskiwaniu drewna
    Autorzy:
    Kormanek, M.
    Kępa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/93773.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    timber harvesting
    work performance
    harvester
    harwester
    pozyskiwanie drewna
    wydajność
    Opis:
    The paper presents the work performance analysis of timber harvesting with the use of Highlander harvester produced by KONRAD Forsttechnik GmbH. The analysis was performed based on the timing of the working day. We also assessed the organization of the machine operation in the research area and its functional capability. The study was conducted in Miçdzylesie Forest Department, Nowu Wieś Forestry in fresh mixed mountain forest, where the machine acquired spruce. Timing was perfonned based on the registration of the machine operation on a video camera and the measurements of collected assortment. Based on the results of measurements it was found that organization of the machine operation was not the best. A one-shift work system and short duration of a shift caused that the effective working time occupied only 67.9% of the shift time (about 4 hours). This resulted in reduction of the operating perfonnance on a working day which was only 12,7 m3·h-1, while an effective high-efficiency was 18.7 m3·h-1.
    W artykule przedstawiono analizę wydajności harwestera Highlander firmy Konrad Forsttechnic GmbH, przy maszynowym pozyskiwaniu drewna. Analizę wykonano w oparciu o chronometraż dnia roboczego, co posłużyło również do oceny organizacji pracy oraz funkcjonalności badanego harwestera. Badania przeprowadzono na terenie Nadleśnictwa Międzylesie, Leśnictwo Nowa Wieś na typie siedliskowym lasu las mieszany górski świeży (LMGśw), gdzie harwester pozyskiwał drewno świerkowe. Chronometraż wykonano w oparciu o rejestrację czasu eksploatacji harwestera przy pomocy kamery wideo oraz pomiarów pozyskanego sortymentu. Na podstawie uzyskanych wyników stwierdzono, że organizacja pracy maszyny nie była najlepsza. Jednozmianowy system pracy oraz krótki czas trwania zmiany spowodował, że efektywny czas pracy wynosił tylko 67,9% czasu zmiany tj. ok 4 h. Pomimo wysokiej wydajności efektywnej harwestera, która wyniosła 18,7 m3·h-1, to uzyskana przez niego wydajność eksploatacyjna była niska i wyniosła 12,7 m3·h-1.
    Źródło:
    Agricultural Engineering; 2016, 20, 3; 73-82
    2083-1587
    Pojawia się w:
    Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tlen: daje życie i mówi o życiu - wykorzystanie trwałych izotopów tlenu w antropologii
    Autorzy:
    Madrzyk, K.
    Noga, P.
    Kepa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/846057.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Tematy:
    antropologia
    badania izotopowe
    tlen
    izotopy trwale
    wykorzystanie
    obieg pierwiastkow
    Źródło:
    Wszechświat; 2013, 114, 08-09
    0043-9592
    Pojawia się w:
    Wszechświat
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagenetic signals from ancient human remains - bioarchaeological applications
    Autorzy:
    Szostek, K.
    Stepańczak, B.
    Szczepanek, A.
    Kępa, M.
    Głąb, H.
    Jarosz, P.
    Włodarczak, P.
    Tunia, K.
    Pawlyta, J.
    Paluszkiewicz, C.
    Tylko, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086542.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Mineralogiczne
    Tematy:
    diagenesis
    Neolithic
    oxygen isotopes
    FTIR
    EDS
    bioarchaeology
    Opis:
    This preliminary study examines the potential effects of diagenetic processes on the oxygen-isotope ratios of bone and tooth phosphate (δ18O) from skeletal material of individuals representing the Corded Ware Culture (2500–2400 BC) discovered in Malżyce (Southern Poland). Intra-individual variability of Ca/P, CI, C/P, collagen content (%) and oxygen isotopes was observed through analysis of enamel, dentin and postcranial bones. Using a variety of analytical techniques, it was found that, despite the lack of differences in soil acidity, not all the parts of a skeleton on a given site had been equally exposed to diagenetic post mortem changes. In a few cases, qualitative changes in the FTIR spectrum of analysed bones were observed. The data suggest that apart from quantitative analyses, i.e., the calculation of Ca/P, CI, C/P and collagen content, qualitative analyses such as examination of the absorbance line are recommended. The degree to which a sample is, contaminated on the basis of any additional, non-biogenic peaks, deemed to be contaminated should also be specified.
    Źródło:
    Mineralogia; 2011, 42, 2/3; 93--112
    1899-8291
    1899-8526
    Pojawia się w:
    Mineralogia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hardware Accelerated Simulation of Crest Factor Reduction Block for Mobile Telecommunications
    Autorzy:
    Nikodem, M.
    Kępa, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/226366.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    crest factor reduction
    configurable hardware
    hardware acceleration
    FPGA
    telecommunications
    Opis:
    This paper reports results of the hardware accelerated simulations of the crest factor reduction (CFR) block which is a common element of the radio signal processing path in base stations for mobile telecommunications. Presented approach increases productivity of radio system architects by shortening the time of model architecture evaluation. This enables unprecedented scale of CFR parameter optimization which requires thousands of simulation runs. We use FPGA device and Xilinx System Generator for DSP technology in order to model CFR block in MATLAB/Simulink environment, implement the accelerator and use it for mixed hardware-software simulation. Reported approach reduces simulation time by 70%, provides straight forward use of fixed-point arithmetic and lowers power consumption by 73% at the cost of constant and relatively low overhead on model development.
    Źródło:
    International Journal of Electronics and Telecommunications; 2012, 58, 4; 363-368
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of Interlayer Magnetic Coupling in All-Semiconductor Superlattices by Means of Neutron Scattering Techniques
    Autorzy:
    Kępa, H.
    Giebultowicz, T. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030768.pdf
    Data publikacji:
    2002-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.25.+z
    75.50.Pp
    75.75.+a
    Opis:
    An overview of neutron scattering studies of ferromagnetic and antiferromagnetic all-semiconductor superlattices is presented. Diffraction experiments on MnTe/CdTe, MnTe/ZnTe and EuTe/PbTe superlattices show pronounced correlations between the MnTe and EuTe layers across the non-magnetic spacers, even though these layers are antiferromagnetic and the systems are nearly-insulating. Current theory status of these systems is discussed. Diffractometry and reflectometry data from EuS/PbS superlattices reveal pronounced antiferromagnetic coupling between the ferromagnetic EuS block. First polarized neutron reflectometry data from superlattices prepared of a novel ferromagnetic"spintronics" material, Ga(Mn)As, are also presented.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 1; 21-34
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ następczy osadów ściekowych stosowanych na glebach piaszczystych na właściwości kompleksu sorpcyjnego
    Effect of Sewage Sludge Applied to Sandy Soils on the Sorption Complex Properties
    Autorzy:
    Stańczyk-Mazanek, E.
    Piątek, M.
    Kępa, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819115.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    osady ściekowe
    gleby piaszczyste
    manure
    metals
    Opis:
    Properties of soil sorption complex are thought to be one of the most important elements which affect its fertility and properties of plants. Extended sorption complex is the element which immobilizes and absorbs a variety of soil contaminants. Characteristics of sorption complex are affected by e.g. organic matter, humic relationships which occur during decomposition of organic matter, clay materials, pH, hydrolytic acidity. Soil reaction is regarded to be one of the most important indicators of soil fertility. Soil reaction largely determines its physical, chemical and biological properties. Foundation acidity affects the structure firmness and the related water and air conditions. One of the methods of disposal of sewage sludge, which is based on its fertilizing properties, is its use in nature, e.g. in farming (if all the permissible standards are met). However, the sludge used for soil fertilization might also contain heavy metals which cause soil contamination and are accumulated in plants. The effect of application of organic fertilizers on soil reaction and other properties of sorption complex are also essential. The authors of the present study aimed at analysis of the effect of use of sewage sludge and selected organic fertilizers on changes in sorption properties in the fertilized soils. Sewage sludge was (for comparison purposes) was introduced to sandy soil. One of organic additions was also composted pine bark. The experiment was carried out under conditions of pot experiment. The following doses of organic fertilizers were used: 0, 10, 50, 100 and 200 Mg/ha (maximal reclamation dose according to current recommendations at the time of experiment) which were calculated per pot with 10 kg of sandy soil. After 1, 2 and 3 years from fertilization, changes in active and hydrolytic acidity were analysed in the fertilized foundations. The contents of organic matter, total of alkali in sorption complex S, soil sorption capacity T in fertilized soils was also determined. In summary of the obtained results, one can conclude that the use of organic fertilizers, either manure or sewage sludge, considerably affects properties of sorption complex in fertilized soil. Organic fertilization improved soil properties. The total of exchangeable alkali and sorption complex capacity also increased. However, it was only manure used during the experiment that contributed to a reduction in the acidity of the fertilized soils in each case. It was found that the use of sewage sludge has significant effect on long-term phenomena of soil acidification. These mechanisms are confirmed by the obtained values of hydrolytic acidity.
    Źródło:
    Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 3; 2437-2451
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reanalysis of the Ångström System $(B^1 Σ^{+} - A^1 \Pi)$ in the $\text{}^{13}C^{16}O$ Isotopic Molecule
    Autorzy:
    Hakalla, R.
    Szajna, W.
    Zachwieja, M.
    Kępa, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418230.pdf
    Data publikacji:
    2012-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Kf
    33.20.Sn
    33.15.Mt
    Opis:
    The emission spectrum of the Ångström system $(B^1 Σ^{+} - A^1 \Pi)$ of $\text{}^{13}C^{16}O$ was obtained under high resolution with an accuracy estimated to be ± 0.002 $cm^{-1}$ as an emission spectrum using a high accuracy dispersive optical spectroscopy. The light source was a hollow-cathode lamp with two anodes built in our laboratory, with a previously deposited small quantity of $\text{}^{13}C$ carbon on the electrodes. The emission from the discharge was observed with a plane grating spectrograph and recorded by a photomultiplier tube. In total 195 transition wave numbers belonging to the strongest 0-1 and 0-2 bands of the B - A system were precisely measured. The modern rotational reanalysis made it possible to verify the molecular information for the both combining states of the Ångström system. In particular the rovibrational constants for the $B^1 Σ^{+}$ Rydberg state have been significantly improved ($B_0$ = 1.8625054(65) $cm^{-1}$ and $D_0=6.1384(52) \times 10^{-6} cm^{-1}$) and the obtained equilibrium rotational constants of this state are more accurate than known to date. Numerous rotational perturbations observed in the $A^1$ Π state were reanalysed and confronted with the previously known ones.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 4; 674-682
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the A$\text{}^{1}$Π State on the Basis of the Douglas-Herzberg Bands System in the CH+ Ion Molecule
    Autorzy:
    Hakalla, R.
    Kępa, R.
    Szajna, W.
    Zachwieja, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047346.pdf
    Data publikacji:
    2007-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Kf
    Opis:
    This paper presents an attempt of examining the irregularities appearing in a complicated A$\text{}^{1}$Π state of the CH$\text{}^{+}$ molecule with their reasons provided. By using the experimental data for the A$\text{}^{1}$Π-X$\text{}^{1}$Σ$\text{}^{+}$ bands system of the $\text{}^{12}$CH$\text{}^{+}$ ion radical, it was proved that the vibrational and rotational quanta of the upper state reveal the same unusual behaviour, i.e. very clear nonlinear dependence on vibrational quantum number (v'≥3) of the upper state. Therefore, upper vibrational levels (v'≥3) of the A$\text{}^{1}$Π state cannot be determined by means of the equilibrium constants calculated in the previous works. Due to so far unidentified A$\text{}^{1}$Π state perturbations, the reduction of the wave numbers to the rovibronic parameters was carried out by means of individual, band-by-band analysis method, using with this end in view the nonlinear least squares method introduced by Curl and Dane, and Watson. This method allowed one to make already calculated constants of the rovibronic structure of regular lower state X$\text{}^{1}$Σ$\text{}^{+}$ of A-X system independent of possible perturbations appearing in the upper state of A$\text{}^{1}$Π of this system. It also enabled one to calculate for the first time the real (perturbed) term values for the A$\text{}^{1}$Π (v' =0, 1, 2, and 3) state of the $\text{}^{12}$CH$\text{}^{+}$ ion molecule. These values suggest that rotational irregularities in the A$\text{}^{1}$Π state examined are negligibly small. In order to confirm the nonexistence of rotational perturbations in the A$\text{}^{1}$Π (v' =0, 1, 2, and 3) state, up to the observed J$\text{}_{m}$ax level, appropriate graphs of functions f$\text{}_{x}$(J) and g$\text{}_{x}$(J) introduced by Gerö and Kovács, where x = Q, PR, and overline{PR}, were drawn. Also, their course was analysed in detail.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 6; 821-834
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emission Spectroscopy of AlH: the X¹Σ⁺, A¹Π and C¹Σ⁺ States Characteristics
    Autorzy:
    Szajna, W.
    Zachwieja, M.
    Hakalla, R.
    Kępa, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493413.pdf
    Data publikacji:
    2011-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Kf
    33.20.Vq
    Opis:
    The visible spectrum of AlH has been investigated at high resolution between 20000 and 21500 $cm^{-1}$ using a conventional spectroscopic technique. The AlH molecules were formed and excited in an aluminium hollow-cathode lamp with two anodes, filled with a mixture of Ne carried gas and a trace of $NH_3$. The emission from the discharge was observed with a plane grating spectrograph and recorded by a photomultiplier tube. The 0-0 and 1-1 bands of the C¹Σ⁺-A¹Π system and 0-2 band of the A¹Π-X¹Σ⁺ were identified at 21126, 21368 and 20276 $cm^{-1}$, respectively. In total 121 transition wave numbers belonging to three bands were precisely measured (with accuracy of ±0.003 cm^{-1}) and rotationally analysed. The new data were elaborated with the help of recent X¹Σ⁺ state parameters reported by White et al. and of the C¹Σ⁺, A¹Π states constants reported by Szajna and Zachwieja. As a result of this merged analysis the set of the molecular parameters and rotational terms values for the three lower lying states of the AlH molecule have been significantly improved.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 3; 417-423
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of numerical modeling in analysis of the operation of a storm sewage system
    Zastosowanie modelowania numerycznego w analizie pracy fragmentu sieci kanalizacji deszczowej
    Autorzy:
    Musz-Pomorska, A.
    Widomski, M. K.
    Kępa, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/127483.pdf
    Data publikacji:
    2018
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    storm sewage system
    SWMM
    quantitative and qualitative analysis
    sieć kanalizacji deszczowej
    analiza ilościowa i jakościowa
    Opis:
    The increase in paved surfaces area in cities, in relation to the natural permeable areas, results in increased loads of pollutants transported by the storm sewage system directly to the receivers. Storm wastewater, as it was reported in literature, in dependence to the type and of urbanized basin and manner of drainage contains significant concentration of pollutants, mainly: Total Suspended Solids (TSS), Total Nitrogen (TN), Total Phosphorus (TP), heavy metals and oil derivatives. In according with the Water Framework Directive, in many European countries, the alternative methods of managing rain sewage are being developed, allowing retention and purification of storm water at the place of its formation. In the case of existing storm swage networks, the numerical analysis of hydraulic conditions and quantitative assessment of transported pollutants may support actions taken to protect the natural ecosystems against the exceeding the permissible concentrations of pollutants. This paper presents the results of modelling of hydraulic parameters and quality conditions of storm wastewater in a selected part of the urban storm sewage system. The USEPA’s (United States Environmental Protection Agency) software SWMM 5 (Storm Water Management Model) was applied to our studies. Three different rainfall events of various intensity and time duration were studied in our research. The conducted simulation tests enabled the analysis of the sewage flow rate, the canals filling height as well as the concentrations and loads of TSS, TP, TN at the outlet from the sewage system to the receiver. The results of the performed calculations showed that in the case of low-intensity rainfall, the unfavourable hydraulic conditions are present in the studied network. At the same time, the occurrence of storm event or extreme rainfall can lead to the flushing of deposits collected at the basin surface as well as at the bottom of pipes and the increase in loads of pollutants transported to the receiver.
    Wzrost udziału powierzchni utwardzonych w stosunku do naturalnych powierzchni przepuszczalnych miast powoduje wzrost ładunków zanieczyszczeń przenoszonych przez system kanalizacji deszczowej bezpośrednio do odbiorników. Ścieki deszczowe, jak wykazują badania literaturowe, w zależności od sposobu wykorzystania odwadnianej powierzchni zurbanizowanej przenoszą znaczne ładunki zanieczyszczeń, głównie zawiesiny ogólnej, ChZT, BZT, metali ciężkich czy związków ropopochodnych. Zgodnie z Ramową Dyrektywą Wodną w wielu krajach europejskich podejmowane są działania mające na celu rozwój alternatywnych metod zagospodarowania ścieków deszczowych, umożliwiających ich zatrzymywanie i oczyszczanie w miejscu ich powstawania. W przypadku istniejących już sieci deszczowych numeryczna analiza warunków hydraulicznych oraz ocena ilościowa transportowanych zanieczyszczeń może wspomóc działania podejmowane w celu ochrony naturalnych ekosystemów przed wzrostem/przekroczeniem dopuszczalnych stężeń zanieczyszczeń. W pracy zaprezentowano wyniki badań modelowych warunków hydraulicznych oraz jakościowych transportowanych ścieków deszczowych w wybranym fragmencie sieci deszczowej. Badania przeprowadzono w programie SWMM 5 przy założeniu zróżnicowanego natężenia deszczu oraz czasu jego trwania. Przeprowadzone badania symulacyjne umożliwiły analizę prędkości przepływu ścieków, wysokości napełnienia ścieków w przewodach, a także stężeń i ładunków zanieczyszczeń zawiesiny ogólnej, fosforu i azotu na wylocie z układu kanalizacyjnego do odbiornika. Wyniki przeprowadzonych obliczeń wykazały, iż w sieci kanalizacji deszczowej w przypadku opadów o niewielkim natężeniu panują niesprzyjające warunki hydrauliczne. Jednocześnie występowanie deszczów burzowych czy ekstremalnych może prowadzić do wymywania osadów zgromadzonych na dnie przewodów i wzrostu zanieczyszczeń przenoszonych do odbiornika.
    Źródło:
    Proceedings of ECOpole; 2018, 12, 2; 307-313
    1898-617X
    2084-4557
    Pojawia się w:
    Proceedings of ECOpole
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza rozmieszczenia pierwiastków w badaniach archeometrycznych z zastosowaniem mikropróbkowania laserowego w spektrometrii mas z jonizacją w plazmie indukcyjnie sprzężonej
    Elemental distribution in archaeometric studies with the use of micro-destructive laser ablation inductively coupled plasma mass spectrometry
    Autorzy:
    Kępa, L.
    Then-Obłuska, J.
    Otmianowska, M.
    Wagner, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/172803.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    LA-ICP-MS
    spektrometria mas z jonizacją w plazmie indukcyjnie sprzężonej
    archeometria
    obiekty zabytkowe
    Inductively Coupled Plasma Mass Spectrometry
    archaeometry
    cultural heritage objects
    Opis:
    Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) is one of modern instrumental methods, which use in elemental analysis of cultural heritage objects has recently noticeably increased. The method requires almost no sample preparation and permits direct analysis of solid samples, availing only minute amount of the material. The micro-destructiveness of ablation processes remains usually within the scale acceptable for art historians, conservators, archaeologists and art curators, therefore the capability to perform multi-elemental, ultra trace and isotopic analysis can be fully used during studies of cultural heritage objects. The lack of appropriate matrix-matched certified reference materials and the fractionation effects, which may influence the final quantitative results to a different extent, are widely reported among the main limitations of LA-ICP-MS. Despite these constrains, LA-ICP-MS is a method that can be flexibly tuned to collect the desired elemental information about various cultural heritage objects. This paper focuses on advantages of using LA-ICP-MS in analysis of heterogeneous objects in respect of mapping of elemental distribution either during the onepoint or multi-line ablation executed directly from the surface of the investigated objects. The use of LA-ICP-MS allowed collection of chemical information availing reconstruction of distribution patterns, which reflected important structural characteristic of the small gilded decoration produced in mediaeval times (collection of Gallery of Medieval Art, the National Museum in Warsaw) and archaeological “metal-in-glass”/“sandwich” bead (Nubian collection, the Museum of Archaeology University of Stavanger, Norway). The mediaeval decoration was identified as the gilded (Ag+Au) copper object, which due to corrosion and re-painting has lost their original appearance. The bead was produced from two various types of glass and a metal foil (Ag+Au+Cu) between them. In both cases LA-ICP-MS was used successfully to determine the main elemental composition and to collect information about elemental distribution in the investigated artifact.
    Źródło:
    Wiadomości Chemiczne; 2015, 69, 9-10; 719-733
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interlayer Coupling in EuS-Based Superlattices Deduced from Neutron Scattering Experiments
    Autorzy:
    Sankowski, P.
    Kępa, H.
    Kacman, P.
    Sipatov, A. Yu.
    Majkrzak, C. F.
    Giebultowicz, T. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038133.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ak
    75.25.+z
    68.65.Cd
    Opis:
    The ferromagnetic/diamagnetic semiconductor superlattices, EuS/PbS and EuS/YbSe, were studied by neutron reflectivity. In order to determine the strength of the interlayer coupling, the intensity of the first magnetic Bragg peak vs. applied external magnetic field was measured. Additionally, the in-plane anisotropy and the domain structure were studied by polarized neutron reflectivity. The dependence of the intensity of the antiferromagnetic neutron reflectivity peak vs. magnetic field was simulated using a Stoner-Wohlfarth model. To reproduce the observed spectra it was necessary to take into account the presence of fluctuations of the nonmagnetic layers thickness, by assuming a Gaussian spread of the interlayer coupling constant $J$. For both EuS/PbS and EuS/YbSe superlattices, the best fit was obtained for the directions of the in-plane easy axes, which agree with those determined by polarized neutron reflectivity.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 607-614
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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