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Tytuł:
Energy Transfer in Peridinin-Chlorophyll-Protein-Metallic Nanoparticle Hybrid Nanostructure: Effect of Spatial Arrangement
Autorzy:
Schmidt, M.
Mackowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1419514.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.-j
73.20.Mf
82.20.Rp
Opis:
We theoretically investigate dynamics of excitation in a hybrid nanostructure comprising a photosynthetic complex peridinin-chlorophyll-protein (PCP) coupled to a gold spherical nanoparticle. Our model includes the analytical description of radiative and non-radiative relaxation channels of the chlorophylls in PCP, as well as the change of energy transfer rate within the PCP due to the presence of metal scatterer. We show that by measuring the intensity of fluorescence from selectively excited chlorophyll molecules in the PCP complex, elementary geometric properties of the system can be deduced.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 307-311
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonoverlapping domain decomposition for optimal control problems governed by semilinear models for gas flow in networks
Autorzy:
Leugering, G.
Martin, A.
Schmidt, M.
Sirvent, M.
Powiązania:
https://bibliotekanauki.pl/articles/205527.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimal control
gas networks
Euler equation
semilinear PDE
nonoverlapping domain decomposition
Opis:
We consider optimal control problems for gas flow in pipeline networks. The equations of motion are taken to be represented by a first-order system of hyperbolic semilinear equations derived from the fully nonlinear isothermal Euler gas equations. We formulate an optimal control problem on a network and introduce a tailored time discretization thereof. In order to further reduce the complexity, we consider an instantaneous control strategy. The main part of the paper is concerned with a nonoverlapping domain decomposition of the optimal control problem on the graph into local problems on smaller sub-graphs—ultimately on single edges. We prove convergence of the domain decomposition method on networks and study the wellposedness of the corresponding time-discrete optimal control problems. The point of the paper is that we establish virtual control problems on the decomposed subgraphs such that the corresponding optimality systems are in fact equal to the systems obtained via the domain decomposition of the entire optimality system.
Źródło:
Control and Cybernetics; 2017, 46, 3; 191-225
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wplyw toksycznych metabolitow trawienia na proliferacje i uszkodzenia DNA nablonkowych komorek jelitowych in vitro
Autorzy:
Olejnik, A
Schmidt, M
Wojnarowska, K
Grajek, W
Powiązania:
https://bibliotekanauki.pl/articles/828540.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Technologów Żywności
Tematy:
zywnosc
komorki nablonka
fizjologia czlowieka
proliferacja
jelita
linia Caco-2
fenole
metabolity
hodowla in vitro
krezole
toksycznosc
amoniak
zywienie czlowieka
trawienie
uszkodzenia
DNA
Opis:
Przedmiotem prezentowanej pracy było określenie wpływu wybranych metabolitów (amoniaku, fenolu i krezolu), powstających w czasie procesu trawienia, na przeżywalność i proliferację ludzkich enterocytów in vitro. Do badań bezpośredniego oddziaływania wymienionych związków na komórki nabłonka jelitowego wykorzystano linię komórkową Caco-2, która w warunkach in vitro tworzy monowarstwę komórek funkcjonalnie i strukturalnie podobnych do ludzkich enterocytów. W celu oceny cytotoksycznego i genotoksycznego efektu działania wybranych związków na komórki Caco-2 posłużono się następującymi metodami badawczymi: oznaczenie stężenia komórek metodą hemocytometryczną, oznaczenie przeżywalności komórek poprzez barwienie błękitem Trypanu, określenie stopnia uszkodzeń DNA za pomocą testu kometkowego. Dowiedziono, że ekspozycja komórek Caco-2 na stosunkowo niskie stężenia wszystkich testowanych związków powodowała znaczący spadek ich przeżywalności i proliferacji. Stwierdzono, że antyproliferacyjne oddziaływanie metabolitów procesu trawienia było związane z indukcją uszkodzeń DNA w komórkach nabłonka jelitowego. (abstrakt oryginalny)
The subject of presented paper was to describe the effect of selected digestive metabolites (ammonia, phenol and cresol), arising while digestive process, on viability and proliferation of human enterocytes in vitro. The structural as well as functional similarities to intestinal human enterocytes has resulted in Caco- 2 cell line was used in our studies. Based on determination of cell viability, cell concentration and evaluation of the DNA damages level in the cells exposed to the tested compounds, the cytotoxic and genotoxic effects were investigated. Cell concentration was determined using Neubauer hemocytometer and cell viability was evaluated by trypan blue exclusion dye. For the DNA damage determination , the comet assay was used. It was proved that upon exposure of Caco-2 cells to relatively low concentrations of all tested metabolites, significant decrease in cell viability and proliferation was observed. According to the findings in this study, the growth inhibitory effect of digestive metabolites on the intestinal cells is due to DNA damages. (original abstract)
Źródło:
Żywność Nauka Technologia Jakość; 2006, 13, 1; 46-57
1425-6959
Pojawia się w:
Żywność Nauka Technologia Jakość
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Exchange and Rotatable Anisotropies in Co₂FeSi/IrMn Exchange Coupled Structures using Broadband Ferromagnetic Resonance
Autorzy:
Głowiński, H.
Schmidt, M.
Krysztofik, A.
Gościańska, I.
Dubowik, J.
Powiązania:
https://bibliotekanauki.pl/articles/1386989.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.30.Et
75.60.Jk
Opis:
We determined exchange $H_{ex}$ and rotatable $H_{rot}$ anisotropy fields of multilayers that comprise 10 nm Co₂FeSi (CFS) layers exchange coupled to 20 nm IrMn layers by using ferromagnetic resonance with a vector network analyzer (VNA-FMR). The multilayer structures consist of IrMn/bottom (b)-CFS/IrMn/middle (m)-CFS/IrMn/top (t)-CFS/IrMn layers so that each CFS layer is surrounded by a pair of IrMn layers. In the structures, the exchange bias field propagates in such a way that $H_{ex}^{t}$ > $H_{ex}^{m}$ > $H_{ex}^{b}$ for the top, middle, and bottom layer, respectively. FMR response measured along the exchange bias (EB) axis consist of only two absorptions related to the (b+m)- and (t)-CFS layers, respectively. Exchange and rotatable anisotropy determined independently from angular and dispersion measurements of the resonance fields are nearly the same. Rotatable anisotropy field scales with the exchange bias field in these complex structures.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 531-533
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for evaluation of uncertainties of noise parameter measurement
Autorzy:
Schmidt-Szałowski, M.
Wiatr, W.
Powiązania:
https://bibliotekanauki.pl/articles/308144.pdf
Data publikacji:
2002
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
microwaves
noise metrology
measurement system
four noise parameters
sensitivity analysis
error propagation
uncertainty
Opis:
The assessment of uncertainties of a two-port noise parameters measurement, presented in the paper, relies on modeling of sources of errors and an investigation of propagation of the errors through a measurement system. This approach is based on a simplified additive error model and small-change sensitivity analysis. The evaluated uncertainties agrees with those observed in experiments. This method may be implemented in automatic noise measurement systems for on-line uncertainty assessment and for optimization of the design of an experiment.
Źródło:
Journal of Telecommunications and Information Technology; 2002, 1; 34-38
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Underwater acoustic communication system using broadband signal with hyperbolically modulated frequency
Autorzy:
Schmidt, Jan H.
Schmidt, Aleksander M.
Powiązania:
https://bibliotekanauki.pl/articles/2146694.pdf
Data publikacji:
2021
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
underwater acoustic communication
shallow water
hyperbolic modulation frequency signals
akustyczna komunikacja podwodna
wody płytkie
hiperboliczna modulacja sygnałów częstotliwościowych
Opis:
The implementation of reliable acoustic underwater communication in shallow waters is a scientific and engineering challenge, mainly due to the permanent occurrence of the multipath phenomenon. The article presents the concept of a transmission system using a broadband signal with hyperbolically modulated frequency (HFM) to transmit data symbols and synchronize data frames. The simulation tests were carried out in channels with Rician fading, reflecting the short- and medium-range shallow water channels. The simulation also took into account the presence of additive Gaussian noise in the channel on the functioning of the receiver. The obtained results prove the high reliability of the underwater communication system based on broadband HFM signals.
Źródło:
Vibrations in Physical Systems; 2021, 32, 1; art. no. 2021116
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synchronization system for underwater acoustic communications using in shallow waters
Autorzy:
Schmidt, Jan H.
Schmidt, Aleksander M.
Powiązania:
https://bibliotekanauki.pl/articles/24201990.pdf
Data publikacji:
2023
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
synchronization system
underwater acoustic communications
shallow water
układy synchronizacji
akustyczna komunikacja podwodna
wody płytkie
Opis:
A reliable synchronization system of the transmitted data frame has a significant impact on the efficiency of the underwater communication system. This applies in particular to communication systems dedicated to work in shallow waters, where the phenomenon of multipath permanently occurs. To overcome these difficulties, the concept of a synchronization system consisting of two broadband signals of opposite monotonicity was presented. The method of receiving these signals has been described in detail. The stochastic channel model with Rician fading and the Watermark simulator was used to test the efficiency of the synchronization system in the underwater multipath channel.
Źródło:
Vibrations in Physical Systems; 2023, 34, 1; art. no. 2023102
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-Quality Ni-Fe/Cu Multilayer Films with Antiferromagnetic Coupling
Autorzy:
Stobiecki, F.
Dubowik, J.
Luciński, T.
Szymański, B.
Rohrmann, H.
Röll, K.
Schmidt, M.
Powiązania:
https://bibliotekanauki.pl/articles/1955455.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Tt
76.50.+g
Opis:
We report structural and magnetic properties of Ni$\text{}_{83}$Fe$\text{}_{17}$/Cu multilayer films with various buffer layer and sublayer thicknesses of copper d$\text{}_{Cu}$ and Permalloy d$\text{}_{Py}$ deposited by face-to-face sputtering. The following features prove a good quality of our films: a well-layered structure, complete antiferromagnetic coupling with a low coupling strength (2×10$\text{}^{-5}$ J/m$\text{}^{2}$ for d$\text{}_{Cu}$=1 nm and 10$\text{}^{-6}$ J/m$\text{}^{^2}$ for d$\text{}_{Cu}$=2.1 nm) and a low coercive field which make them attractive for possible applications as giant magnetoresistance sensors.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 277-280
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of nanostructured bulk cobalt triantimonide doped with tellurium and indium prepared by pulsed plasma in liquid method
Autorzy:
Zybała, R.
Schmidt, M.
Kaszyca, K.
Chmielewski, M.
Kruszewski, M. J.
Jasiński, M.
Rajska, M.
Ciupiński, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/200831.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermoelectric materials
nanostructured materials
skutterudite
energy harvesting
spark plasma sintering
Opis:
One of the ways to decrease thermal conductivity is nano structurization. Cobalt triantimonide (CoSb3) samples with added indium or tellurium were prepared by the direct fusion technique from high purity elements. Ingots were pulverized and re-compacted to form electrodes. Then, the pulsed plasma in liquid (PPL) method was applied. All materials were consolidated using rapid spark plasma sintering (SPS). For the analysis, methods such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) with a laser flash apparatus (LFA) were used. For density measurement, the Archimedes’ method was used. Electrical conductivity was measured using a standard four-wire method. The Seebeck coefficient was calculated to form measured Seebeck voltage in the sample placed in a temperature gradient. The preparation method allowed for obtaining CoSb3 nanomaterial with significantly lower thermal conductivity (10 Wm–1K–1 for pure CoSb3 and 3 Wm–1K–1 for the nanostructured sample in room temperature (RT)). The size of crystallites (from SEM observations) in the powders prepared was about 20 nm, joined into larger agglomerates. The Seebeck coefficient, α, was about –200μVK–1 in the case of both dopants, In and Te, in microsized material and about −400 μK−1 for the nanomaterial at RT. For pure CoSb3 , α was about 150 μVK−1 and it stood at −50 μVK−1 for nanomaterial at RT. In bulk nanomaterial samples, due to a decrease in electrical conductivity and inversion of the Seebeck coefficient, there was no increase in ZT values and the ZT for the nanosized material was below 0.02 in the measured temperature range, while for microsized In-doped sample it reached maximum ZT = 0.7 in (600K).
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 125-134
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of the Direct Sequence Spread Spectrum Underwater Acoustic Communication System with Differential Detection in Strong Multipath Propagation Conditions
Autorzy:
Schmidt, Jan H.
Kochańska, Iwona
Schmidt, Aleksander M.
Powiązania:
https://bibliotekanauki.pl/articles/31339747.pdf
Data publikacji:
2024
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
direct sequence spread spectrum
DSSS
m-sequences
Kasami codes
shallow-water channel
multipath propagation
underwater acoustic communications
UAC
Opis:
The underwater acoustic communication (UAC) operating in very shallow-water should ensure reliable transmission in conditions of strong multipath propagation, significantly disturbing the received signal. One of the techniques to achieve this goal is the direct sequence spread spectrum (DSSS) technique, which consists in binary phase shift keying (BPSK) according to a pseudo-random spreading sequence. This paper describes the DSSS data transmission tests in the simulation and experimental environment, using different types of pseudo-noise sequences: m-sequences and Kasami codes of the order 6 and 8. The transmitted signals are of different bandwidth and the detection at the receiver side was performed using two detection methods: non-differential and differential. The performed experiments allowed to draw important conclusions for the designing of a physical layer of the shallow-water UAC system. Both, m-sequences and Kasami codes allow to achieve a similar bit error rate, which at best was less than 10−3. At the same time, the 6th order sequences are not long enough to achieve an acceptable BER under strong multipath conditions. In the case of transmission of wideband signals the differential detection algorithm allows to achieve a significantly better BER (less than 10−2) than nondifferential one (BER not less than 10−1). In the case of narrowband signals the simulation tests have shown that the non-differential algorithm gives a better BER, but experimental tests under conditions of strong multipath propagation did not confirm it. The differential algorithm allowed to achieve a BER less than 10−2 in experimental tests, while the second algorithm allowed to obtain, at best, a BER less than 10−1. In addition, two indicators have been proposed for a rough assessment which of the detection algorithms under current propagation conditions in the channel will allow to obtain a better BER.
Źródło:
Archives of Acoustics; 2024, 49, 1; 129-140
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of coherent modulation scheme used in acoustic underwater communication system
Autorzy:
Schmidt, Jan H.
Schmidt, Aleksander M.
Kochańska, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/127757.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
underwater acoustic communications
shallow underwater channel
coherent modulation
akustyczna komunikacja podwodna
płytki kanał podwodny
modulacja koherentna
Opis:
The development of an acoustic underwater communication system for shallow waters is still a big scientific and construction challenge. Currently, non-coherent modulations in combination with strong channel coding are used to achieve reliable communication with low rate in such a channel. To obtain transmission with a higher transmission rate, it is required to use coherent modulation. This paper presents the assumptions of such a transmission system and the results of data transmission carried out by this system in the channel with the Rician fading, which reflects the short range shallow water channel. A digital version of the carrier phase modulation known as Phase-Shift Keying was selected for simulation.
Źródło:
Vibrations in Physical Systems; 2019, 30, 1; 1-8
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Longer Cycles in Essentially 4-Connected Planar Graphs
Autorzy:
Fabrici, Igor
Harant, Jochen
Mohr, Samuel
Schmidt, Jens M.
Powiązania:
https://bibliotekanauki.pl/articles/32083770.pdf
Data publikacji:
2020-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
essentially 4-connected planar graph
longest cycle
circumference
shortness coefficient
Opis:
A planar 3-connected graph $G$ is called essentially 4-connected if, for every 3-separator $S$, at least one of the two components of $G − S$ is an isolated vertex. Jackson and Wormald proved that the length $ \text{circ} (G) $ of a longest cycle of any essentially 4-connected planar graph $G$ on n vertices is at least $ \frac{ 2n+4 }{5} $ and Fabrici, Harant and Jendrol’ improved this result to $ \text{circ} (G) \ge 1/2 (n+4) $. In the present paper, we prove that an essentially 4-connected planar graph on $n$ vertices contains a cycle of length at least $ 3/5 (n+2) $ and that such a cycle can be found in time $ O(n^2) $.
Źródło:
Discussiones Mathematicae Graph Theory; 2020, 40, 1; 269-277
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
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