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Wyświetlanie 1-10 z 11
Tytuł:
The Fine Structure of a Triexciton in Single InAs/GaAs Quantum Dots
Autorzy:
Molas, M.
Gołasa, K.
Furman, M.
Lapointe, J.
Wasilewski, Z.
Potemski, M.
Babiński, A.
Powiązania:
https://bibliotekanauki.pl/articles/1403615.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.Hc
Opis:
Results of experimental study of multiexcitonic emission related to the p-shell of single self-assembled InAs/GaAs quantum dots are presented. Optical properties of a first emission line to appear from the p-shell of a strongly excited quantum dots are investigated using low-temperature polarization-sensitive micro-photoluminescence measurements. The emission line is attributed to the recombination of a complex of three electrons and holes confined in a dot (neutral triexciton), 3X. It is found that the emission consists of two linearly polarized components and the fine structure splitting is larger than the respective splitting of a neutral exciton. The optical anisotropy of the 3X emission is related to the anisotropy of the quantum dot localizing potential. The axis of the 3X optical anisotropy changes from dot to dot covering broad range within ± 50 degrees with respect to the axis defined by the optical anisotropy of a neutral exciton (X). Possible origin of the deviation is discussed.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 991-993
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Excitons in Quantum Dots with a Weak Confinement
Autorzy:
Gołasa, K.
Molas, M.
Goryca, M.
Kazimierczuk, T.
Smoleński, T.
Koperski, M.
Golnik, A.
Kossacki, P.
Potemski, M.
Wasilewski, Z.
Babiński, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399080.pdf
Data publikacji:
2013-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.Hc
Opis:
Statistical properties of neutral excitons, biexcitons and trions confined to natural quantum dots formed in the InAs/GaAs wetting layer are reported. The correlation of the trion binding energy and the biexciton binding energy was found. Magnetospectroscopic measurements of the excitons revealed also the correlation of excitonic effective $g^\ast $ factor of an exciton with the biexciton binding energy. The qualitative picture of the effect of quantum confinement on the observed correlations is presented.
Źródło:
Acta Physica Polonica A; 2013, 124, 5; 781-784
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reducing of Water Turbidity by Hydrotechnical Structures on the Example of the Wloclawek Reservoir
Autorzy:
Szatten, D. A.
Babinski, Z.
Habel, M.
Powiązania:
https://bibliotekanauki.pl/articles/124854.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
suspended sediment transport
turbidity of water
hydrotechnical structures
Wloclawek Reservoir
Opis:
The dynamics of river sediment transport reflects morphogenetic processes taking place in the catchment, being at the same time an anthropogenic indicator. The aim of the research is to determine the impact of hydrotechnical structures on the continuity of suspended sediments transport. The research area is the Lower Vistula River with a single dam – Wloclawek, operating since the 1970s. The research included direct measurements of water turbidity in 2013–2016 in characteristic cross-sections of the Vistula River, using commonly used methods. The LISST-25X laser grain composition measurement sensor was also used to collect data, enabling determination of grain size of the suspended sediments. However, on the selected section of the river, modelling of momentary transport of suspended sediments using GIS tools was carried out. There was a significant dynamics of sediments transport in the longitudinal profile of the river, in relation to the diversity of hydrological and morphological conditions of the Vistula River. The impact of Wloclawek Reservoir on water turbidity reduction was determined. The balance of transport of suspended material was related to the processes of erosion and sediment accumulation below the dam. The functioning of the Wloclawek Reservoir in the current system (as a single dam) has a significant impact on sediment transport, which directly determines the course of fluvial processes across the entire Lower Vistula (from km 675 to the estuary) and indirectly in the coastal zone of the Baltic Sea.
Źródło:
Journal of Ecological Engineering; 2018, 19, 3; 197-205
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Confinement in InAs/GaAs Systems with Self-Assembled Quantum Dots Grown Using In-Flush Technique
Autorzy:
Molas, M.
Kuldová, K.
Borysiuk, J.
Wasilewski, Z.
Babiński, A.
Powiązania:
https://bibliotekanauki.pl/articles/2048050.pdf
Data publikacji:
2011-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.Hc
Opis:
The effect of In-flush technique application to the MBE-grown structure with self-assembled quantum dots is investigated in this work. The microphotoluminescence from structures with the InAs/GaAs dots grown with and without the In-flush has been investigated. We focus our attention on "not fully developed" dots, which can be clearly distinguished in the spectrum. The dots have also been identified in the transmission electron microscopy analysis of the structures. The In-flush does not influence a broad energy range of those features. Instead we have found that the anisotropic exchange energy splitting of neutral excitons confined in those in the structure grown with In-flush is substantially lower that the splitting in the structure with no In-flush. This observation confirms that the In-flush leads not only to better uniformity of self-assembled quantum dots but also to reduction of lateral potential, anisotropy, which is believed to result in the neutral exciton splitting.
Źródło:
Acta Physica Polonica A; 2011, 119, 5; 624-626
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Localization of Excitons in the Wetting Layer Accompanying Self-Assembled InAs/GaAs Quantum Dots
Autorzy:
Babinski, A.
Raymond, S.
Wasilewski, Z.
Lapointe, J.
Potemski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2038091.pdf
Data publikacji:
2004-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.Pq
71.35.Ji
71.70.Ej
Opis:
A wetting layer is a narrow, highly strained quantum well, which accompanies quantum dots grown in Stranski-Krastanow mode. Its importance for a full description of the quantum dots properties has recently been pointed out. It has been shown for example that excitons can be localized by potential fluctuations in the wetting layer. This is equivalent to the formation of "natural" quantum dots in the WL. Excitonic emission from the single dots formed in the wetting layer accompanying the InAs/GaAs self-assembled quantum dots has been investigated in a high magnetic field (up to 23 T). Quadruplet splitting of the investigated emission line has been observed. The attribution of the emission line to the recombination of negatively charged exciton is discussed.
Źródło:
Acta Physica Polonica A; 2004, 105, 6; 547-552
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GaSb Dots Grown on GaAs Surface by Metalorganic Chemical Vapour Deposition
Autorzy:
Bożek, R.
Babiński, A.
Baranowski, J. M.
Stępniewski, R.
Klusek, Z.
Olejniczak, W.
Starowieyski, K.
Wróbel, J.
Powiązania:
https://bibliotekanauki.pl/articles/1934054.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Gh
68.55.-a
Opis:
We report metaloorganic chemical vapour deposition growth of an anisotropic GaSb islands on GaAs (001) surface with a typical dimensions around 200 nm. Results of investigations employing scanning electron microscope, scanning tunnelling microscope and ph9tocapacitance are presented.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 974-976
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neutral and Charged Excitons Localized in the InAs/GaAs Wetting Layer
Autorzy:
Babiński, A.
Czyż, M.
Golnik, A.
Borysiuk, J.
Kret, S.
Raymond, S.
Lapointe, J.
Wasilewski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1811914.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.La
78.55.Cr
78.67.Hc
Opis:
It has recently been shown that potential fluctuations in a wetting layer, which accompanies InAs/GaAs quantum dots can localize excitons. Neutral excitons and biexcitons and charged excitons were identified. In this communication we report on studies of properties of the excitons over wide temperature range (T < 70 K). The micro-photoluminescence measurements enable investigation of excitons localized in a single potential fluctuation. Temperature-induced broadening of the neutral exciton as well as a quenching of the charged exciton at temperatures higher than 50 K are observed and discussed.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 1055-1060
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of hydrological and sedimentological processes on the functioning of inland waterway transport on an example of Brdyujście Regatta Track
Autorzy:
Babiński, Z.
Habel, M.
Szatten, D.
Dąbrowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/360120.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
Brda River
regatta track
waterway E 70
hydrological transformation
total suspension
sediments
Opis:
Article presents the impact of anthropogenesis on the aquatic ecosystem of the Brda River estuary. Studied section is part of the E-70 international waterway, which is connecting Central and Eastern Europe. This small section of the Brda River has very unique character, due to the hydrological transformations during the nineteenth and twentieth centuries by human race. They were happening in the “adaptation of the Brda River to the inland waterways.” They were consisted in the construction of Brdyujście sluice. New hydrotechnical building created artificial water reservoir, which was used for recreational purposes, as the Regatta Track. Damming of the Brda River significantly changed water flow regime in this section. Flow has been slowed and has given nearly limnical nature to the estuary section of the Brda River. This is reflected in the transport of suspended material (total suspension) and the rate of the sedimentation in reservoir. Soundings of the bottom indicated varied thickness of the sediments. Subsequent hydrological changes in the analysed section of the Brda River, occurred at the time of closing the Brdyujście sluice and opening new inland waterway crossing to the Vistula River – Polish Czersko sluice. In this way, a significant part of the waterway (regatta track) was eliminated from the use. These changes are adversely affecting on functioning of the whole research part as an inland waterway. The dredged treatments serve not only providing proper conditions for a sporting event on the Regatta Track, but also should contribute to the improvement of navigation in this part of the Brda River. The research of the concentration of selected elements indicated the spatial variation in the rate of sediment accumulation processes. Based on available data, it is possible to propose dredged treatments as an element that enables the possibility of shipping on the Brda River section to remain at the same level.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 37 (109); 16-21
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydromorphological conditions of the lower Vistula in the development of navigation and hydropower
Uwarunkowania hydromorfologiczne dolnej Wisły w rozwoju żeglugi i hydroenergetyki
Autorzy:
Babiński, Z.
Habel, M.
Powiązania:
https://bibliotekanauki.pl/articles/397164.pdf
Data publikacji:
2013
Wydawca:
ENERGA
Tematy:
fluvial processes
channel pattern
morphodynamics of sandbars
inland navigation
hydropower
Lower Vistula River
procesy fluwialne
typy koryt
morfodynamika łach
żegluga śródlądowa
hydroenergetyka
dolna Wisła
Opis:
The article presents general principles of development of the lower Vistula channel in the Holocene period, with a particular emphasis on the unintentional human interference in the fluvial processes associated with deforestation and cultivation of cereals and root crops. It also characterises the basic hydraulic engineering works in the form of construction of embankments, adjustment of the bed and construction of the Włocławek barrage as factors of deliberate human interference and their impact on channel changes. The article characterises morphological and morphodynamic conditions of the basic bed forms, i.e. sandy and gravel bars and pools determining the possibility of river transport, and its development in time and space (depth of navigable route). Perspectives of multi-directional hydraulic development are presented, including the main cascade developments of the lower Vistula. The article presents the opportunities for a comprehensive use of the waterway, which forms route E40 in the section of the lower Vistula, taking into account sustainable development and compensation in the form of restoration of the valley bottom.
W artykule przedstawiono ogólne prawidłowości rozwoju koryta dolnej Wisły w okresie holocenu, ze szczególnym uwzględnieniem nieświadomej ingerencji człowieka w procesy korytowe, związane z wylesianiem i uprawą zbóż oraz roślin okopowych. Scharakteryzowano podstawowe prace hydrotechniczne w postaci budowy wałów przeciwpowodziowych, regulacji koryta i budowy stopnia wodnego we Włocławku jako czynników świadomej działalności człowieka i ich wpływ na zmiany koryta. Scharakteryzowano warunki morfologiczne i morfodynamiczne podstawowych form korytowych, tj. łach piaszczysto-żwirowych i plos, warunkujących możliwości istnienia transportu rzecznego, jego rozwoju w czasie i przestrzeni (głębokość szlaku żeglownego). Przedstawiono perspektywy wielokierunkowej zabudowy hydrotechnicznej, w tym głównie skaskadowania dolnej Wisły. Zaprezentowano możliwości kompleksowego wykorzystania drogi wodnej, jaką jest E40 w odcinku dolnej Wisły, z uwzględnieniem zrównoważonego rozwoju i rekompensaty w postaci rewitalizacji dna doliny.
Źródło:
Acta Energetica; 2013, 2; 83-96
2300-3022
Pojawia się w:
Acta Energetica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 11

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