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Tytuł:
Photo-ESR Studies of Ni doped ZnS and ZnSe
Autorzy:
Surma, M.
Zakrzewski, A. J.
Godlewski, M.
Surkova, T. P.
Powiązania:
https://bibliotekanauki.pl/articles/1932084.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
76.30.He
78.55.Et
Opis:
The results of electron spin resonance experiments are presented for nickel doped ZnS and ZnSe. Energy level position of Ni$\text{}^{1+}$ state in band gap of ZnS and ZnSe is determined. The nonradiative recombination processes of donor-acceptor pairs in Ni doped samples are discussed.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 221-224
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Co$\text{}^{2+}$ Ions in ZnS$\text{}_{x}$Se$\text{}_{1-x}$:Co - ESR and Optical Studies
Autorzy:
Świątek, K.
Surkova, T. P.
Sienkiewicz, A.
Zakrzewski, A. J.
Godlewski, M.
Giriat, W.
Powiązania:
https://bibliotekanauki.pl/articles/1992580.pdf
Data publikacji:
1998-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
76.30.Fc
78.55.Et
Opis:
The electron spin resonance of Co$\text{}^{2+}$ ions in ZnS$\text{}_{x}$Se$\text{}_{1-x}$:Co mixed crystals was measured at temperature of 3 K and microwave frequency of 9.47 GHz. Trigonal Co$\text{}_{Zn}^{2+}$-S center in the ZnS$\text{}_{0.001}$Se$\text{}_{0.999}$:Co crystal was identified and parameters of relevant spin Hamiltonian were determined. Influence of alloy disorder in the anion sublattice on the Co$\text{}_{Zn}^{2+}$ ground and first excited states is briefly discussed.
Źródło:
Acta Physica Polonica A; 1998, 94, 3; 593-596
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy Level Position of Ni and Band Offsets in Zn$\text{}_{1-x}$Cd$\text{}_{x}$Sc:Ni and ZnS$\text{}_{x}$Sc$\text{}_{1-x}$:Ni
Autorzy:
Surkova, T.
Giriat, W.
Godlewski, M.
Kaczor, P.
Zakrzewski, A. J.
Permogorov, S.
Tenishev, L.
Powiązania:
https://bibliotekanauki.pl/articles/1934015.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Wc
71.55.Gs
Opis:
Absorption and reflectivity measurements have been carried out for Zn$\text{}_{1-x}$Cd$\text{}_{x}$Se:Ni and ZnS$\text{}_{x}$Se$\text{}_{1-x}$:Ni solid solutions. Energy level positions of nickel 2+/1+ charge state have been used for estimation of band offsets for the valence and conduction bands of ZnCdSe/ZnSe and ZnSSe/ZnSe. Intra-shell transitions of Ni$\text{}^{2+}$ were also studied.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 925-928
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonradiative Recombination Processes in (CdTe,CdCrTe)/CdMgTe Quantum Well Structures
Autorzy:
Godlewski, M.
Ivanov, V.
Zakrzewski, A. J.
Wojtowicz, T.
Karczewski, G.
Kossut, J.
Bergman, J. P.
Monemar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1968108.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.60.-p
76.70.Hb
Opis:
Photoluminescence transitions in (CdTe,CdCrTe)/CdMgTe structure grown by molecular beam epitaxy are studied. Photoluminescence investigations show a very strong reduction of the photoluminescence intensity from chromium doped quantum wells. We explain this fact by a very efficient nonradiative recombination in the chromium-doped quantum wells. The present results indicate that the Auger-type energy transfer from excitons to chromium ions is responsible for the photoluminescence deactivation. The efficiency of this process is evaluated.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 781-784
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaos Assisted Tunneling and Nonspreading Wave Packets
Autorzy:
Zakrzewski, J.
Delande, D.
Buchleitner, A.
Powiązania:
https://bibliotekanauki.pl/articles/1968540.pdf
Data publikacji:
1998-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.+b
32.80.Rm
42.50.Hz
Opis:
Consider an initial state lying on a primary resonance island. The state may tunnel into the chaotic sea surrounding it and further escape to infinity via chaotic diffusion. Properties of transport in such a situation are studied on an exemplary system - the hydrogen atom driven by microwaves. We show that the combination of tunneling followed by chaotic diffusion leads to peculiar large scale fluctuations of the AC Stark shift and ionization rates. An appropriate random matrix model describes accurately these statistical properties.
Źródło:
Acta Physica Polonica A; 1998, 93, 1; 179-186
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth of Scots pine (Pinus sylvestris L.) on forest and former agricultural lands in Krynki Forest District
Autorzy:
Zakrzewski, J.
Leosz, K.
Jedrzejuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/38651.pdf
Data publikacji:
2013
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
plant growth
height growth
radial growth
Scotch pine
Pinus sylvestris
needle parameter
forest
agricultural land
Krynki Forest District
Opis:
The paper shows differences in morphological and anatomical features of the Scots pine (Pinus sylvestris L.) growing on former agricultural and forest lands. It was found that at the same age and in the same climatic conditions Scots pines from former agricultural land had larger stem dimensions and needle sizes as compared with the trees growing on forest land. These results lead to an interesting conclusion connected with future afforestation and reforestiation in the Krynki Forest District.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2013, 55, 2
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of Correlations and Off-Diagonal Terms in Binary Disordered One-Dimensional Systems
Autorzy:
Kosior, A.
Major, J.
Płodzień, M.
Zakrzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1189984.pdf
Data publikacji:
2015-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
67.85.-d
03.75.-b
73.20.Fz
73.20.Jc
Opis:
We investigate one-dimensional tight binding model in the presence of a correlated binary disorder. The disorder is due to the interaction of particles with heavy immobile other species. Off-diagonal disorder is created by means of a fast periodic modulation of interspecies interaction. The method based on transfer matrix techniques allows us to calculate the energies of extended modes in the correlated binary disorder. We focus on N-mer correlations and regain known results for the case of purely diagonal disorder. For off-diagonal disorder we find resonant energies. We discuss ambiguous properties of those states and compare analytical results with numerical calculations. Separately we describe a special case of the dual random dimer model.
Źródło:
Acta Physica Polonica A; 2015, 128, 6; 1002-1007
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Symmetry of the Sulfur Pair-Related Defect in Silicon
Autorzy:
Bennebroek, M. T.
Zakrzewski, A.
Frens, A. M.
Schmidt, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929739.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Lh
71.55.Ht
Opis:
A sulfur-related-pair defect in silicon has been studied with optically detected magnetic resonance spectroscopy. Measurement of the angular dependence of the optically detected magnetic resonance signals supplemented by the analysis of the spectrum "quality" yield to the conclusion that the point group symmetry of the defect studied is C$\text{}_{1h}$.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 725-728
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method of the quick identification of pollution derived from oil on the sea surface
Autorzy:
Klewski, A.
Sanecki, J.
Maj, K.
Stępień, G.
Zakrzewski, T.
Powiązania:
https://bibliotekanauki.pl/articles/320454.pdf
Data publikacji:
2007
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
zanieczyszczenia ropopochodne
oil pollution
Opis:
The topic of the publication is the description of the method of quick detection and identification of pollution derived from oil on the water surface. This method is based on the teledetection technique. It is based on the application of a teledetection head, which consists of a digital camera working in a 300 - 1100 nm range and equipped in a suitable filter. The point is to receive digital imageries in several spectral ranges, and processing them in such a way to get an appearance of a polluted area on the imagery. It is possible because of using different reemission characteristics of polluted water surface and water surface free from pollution.
Źródło:
Annual of Navigation; 2007, 12; 55-63
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deep Electron Traps in CdTe:In Films Grown by Molecular Beam Epitaxy
Autorzy:
Żakrzewski, A. K.
Dobaczewski, L.
Karczewski, G.
Wojtowicz, T.
Kossut, J.
Powiązania:
https://bibliotekanauki.pl/articles/1934051.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
73.61.Ga
Opis:
N-type indium doped CdTe grown on n$\text{}^{+}$-GaAs by molecular beam epitaxy has been studied by the standard deep level transient spectroscopy and the isothermal Laplace-transform deep level transient spectroscopy. It was found that the Cd/Te flux ratio strongly influences the deep level transient spectroscopy results. The unusual temperature dependence of the electron emission rate in films grown at nearly stoichiometric conditions may point out that the observed defect is resonant with the conduction band.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 961-964
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected nutritional behaviors and physical activity among elementary school children
Autorzy:
Zalewska, M.
Zubrycki, A.
Sosnowski, Z.
Jamiołkowski, J.
Zakrzewski, M.
Maciorkowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/1918441.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Nutrition
physical activity
children
Opis:
Introduction: Proper nutrition and physical activity are very important elements in the proper functioning and development of children. The lack of daily, systematic physical effort in younger and younger age groups is a public health problem. Purpose: To evaluate the nutrition and physical activity of children attending primary school. Materials and methods: The study was conducted among 707 pupils form randomly selected elementary schools using the authors’ own questionnaire in the school year 2013/2014. The questionnaire included questions on selected dietary habits and physical activity as well as the socio-economic conditions of the families. Results: Among the studied children, 88.6% consumed 4 or 5 meals a day. There was a statistically significant relationship between the number of meals consumed and the age of the children. Breakfast was consumed by 86.4% of children, more often residents of the city than the village (88.0% vs. 81.7%, p <0.05). Daily consum-ption of second breakfast was declared by 71.5% of boys and 74.2% of girls. The vast majority of the studied students (86.8%) have always taken part in physical education classes. Outdoor leisure time was declared by 75% of the surveyed children. Rural students showed greater involvement in outdoor activities than students from the city (86.1% vs. 70.2%, p <0.001). A total of 62.2% of boys and 51.8% of girls (p <0.05) participated in sports activities. Conclusions: Inappropriate nutrition and lack of physical activity affected both girls and boys, and the abnormalities were dependent on where they lived and were age-related.
Źródło:
Progress in Health Sciences; 2017, 7(1); 131-136
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineral content of muscle tissue of rainbow trout (Oncorhynchus mykiss Walbaum)
Autorzy:
Siemianowska, E.
Barszcz, A.A.
Skibniewska, K.A.
Markowska, A.
Polak-Juszczak, L.
Zakrzewski, J.
Wozniak, M.
Szarek, J.
Dzwolak, W.
Powiązania:
https://bibliotekanauki.pl/articles/13811.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
Fish are most often considered as a rich source of valuable fat, although sometimes the high quality of fish meat protein is also emphasized, but there is comparably little information on the mineral composition of fish meat. Chemical composition, caloric value and health safety of fish as food depend on many factors, of which the rearing conditions are most influential. Aside from environmental conditions, production technology is a major determinant of the quality and nutritional value of trout. In this study, the influence of a farming technology on the content of minerals in the muscle tissue of rainbow trout (Oncorhynchus mykiss Walbaum) netted in various Polish regions has been assessed. Fish were caught in autumn 2010 and 2011 and spring 2011, at 3 farms with a water flow-through system and 3 farms with water recirculation. The trout muscle tissue contained: 188.4 - 518.4 mg kg-1 of calcium, 306.9 - 338.1 mg kg-1 of magnesium, 464.0 - 718.2 mg kg-1 of sodium, 4.5 - 6.9 mg kg-1 of zinc, 2485.7 - 2823.6 mg kg-1 of phosphorous, 4261.2 - 4615.4 mg kg-1 of potassium, 3.0 - 9.4 mg kg-1 of iron and 0.09 – 11.74 mg kg-1 of copper. The farming technology influenced the content of calcium, sodium, zinc, iron and copper but had no effect on the content of magnesium, phosphorous and potassium in rainbow trout muscle tissue. Trout farmed in water recirculation systems contained higher amounts of most elements than the fish reared in water flow-through systems. The season of sample collection (date of netting) also affected the content of sodium, zinc, phosphorus, iron and copper. The fish farming site (localization of the farm) determined the content of most of the minerals except magnesium. Rainbow trout is a good source of phosphorous and potassium in a human diet, significantly covering the daily demand for the elements.
Źródło:
Journal of Elementology; 2016, 21, 3
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Whipple’s disease as a systemic infectious disease – a case presentation
Autorzy:
Maciorkowska, M.
Ustymowicz, W.
Zakrzewski, M.
Pryczynicz, A.
Markowski, A.
Romatowski, J.
Guzińska-Ustymowicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/1918601.pdf
Data publikacji:
2018-06-21
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
infectious disease
systemic disease
Tropheryma whipplei
Whipple’s disease
Opis:
Introduction: Whipple’s disease is a chronic systemic infectious disorder with Tropheryma whipplei as an etiologic agent, occurring rarely and affecting numerous organs and systems. The variety of symptoms and a non-typical course make it difficult to establish a proper diagnosis. Purpose: In this study, etiopathogenesis, diagnostics and treatment of Whipple’s disease were presented based on the case report of 60-year-old man diagnosed with Whipple’s disease. Case presentation: Persistent diarrhoea with weight loss, lymphadenopathy in the abdominal cavity and moderate microcytic anemia predominated in the clinical picture. Diagnosis was put based on the clinical picture and macroscopic assessment of the small intestine and the presence of macrophages filled with a PAS-positive substance in the lamina propria. To deepen diagnostics, samples collected were assessed showing macrophages with the damaged mucosa, containing numerous elongated micro-organisms whose ultrastructure corresponded to Tropheryma whipplei. The patient’s clinical conditions improved after antibiotic therapy. Conclusions: It is vital to remember about Whipple’s disease in patients with chronic diseases due to a non-specific clinical picture and difficulties in establishing a proper diagnosis. When the disease is diagnosed unequivocally, proper and effective antibiotic therapy should be instituted immediately.
Źródło:
Progress in Health Sciences; 2018, 8(1); 212-218
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lattice Parameter Relaxation during MBE of ZnTe/Cd$\text{}_{1-x}$Zn$\text{}_{x}$Te/Cd$\text{}_{0.5}$Zn$\text{}_{0.5}$Te Buffer Layers by RHLED and HRTEM
Autorzy:
Kret, S.
Karczewski, G.
Zakrzewski, A.
Dłużewski, P.
Dubon, A.
Wojtowicz, T.
Kossut, J.
Delamarre, C.
Laval, J. Y.
Powiązania:
https://bibliotekanauki.pl/articles/1933838.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Bg
61.14.Hg
68.35.-p
Opis:
The dynamics of the lattice relaxation processes were investigated using a reflection of a high energy electron diffraction analysis system during growth by molecular beam epitaxy of ZnTe/Cd$\text{}_{1-x}$Ζn$\text{}_{x}$Te/Cd$\text{}_{0.5}$Mn$\text{}_{0.5}$Te buffers on GaAs substrates. The variation of the lattice parameter recorded by the high energy electron diffraction during the growth was later confirmed by an analysis of high resolution transmission electron microscopy images. We report also on an observation of oscillations of the lattice parameter during the deposition of several first layers of ZnTe on CdTe.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 795-798
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indium Doping of CdTe Grown by Molecular Beam Epitaxy
Autorzy:
Karczewski, G.
Zakrzewski, A.
Kutrowski, M.
Jaroszyński, J.
Dobrowolski, W.
Grodzicka, E.
Janik, E.
Wojtowicz, T.
Kossut, J.
Barcz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1932089.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
73.61.Ga
Opis:
We report on n-type indium doping of CdTe films grown by molecular beam epitaxy on (001) GaAs substrates. By adjusting the flux of In atoms we can precisely control the carrier concentration over three orders of magnitude - from 8 × 10$\text{}^{14}$ up to 1.3 × 10$\text{}^{18}$ cm$\text{}^{-3}$. In agreement with earlier reports we confirmed that Cd overpressure plays an important role in the doping process. The doping appears to be most effective for Cd/Te pressure ratio of 1.5. For this value of Cd/Te pressure ratio essentially 100% efficiency of doping is achieved at low In concentrations (< 10$\text{}^{18}$ cm$\text{}^{-3}$). At higher In concentrations acceptor impurities compensate shallow donors limiting the concentration of free carriers.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 241-244
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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