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Tytuł:
Anisotropic Lattice Misfit Relaxation in AlGaAs Semi-Bulk Layers Grown on GaAs Substrates by Liquid Phase Electroepitaxy
Autorzy:
Żytkiewicz, Z. R.
Domagała, J.
Bąk-Misiuk, J.
Dobosz, D.
Leszczyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1968459.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.60.Bs
68.55.Ln
Opis:
Experimental evidence for unidirectional microcracking in semi-bulk AlGaAs layers grown on (001) GaAs substrates is presented. The asymmetrical microcracking leads to anisotropic lattice misfit relaxation in the AlGaAs/GaAs structure and is explained in terms of higher mobility of [-110]-oriented α-type dislocations than that of β-type dislocations oriented in [110] direction.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 1092-1096
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electroepitaxial Growth of GaSb and AlGaSb Thick Epitaxial Layers
Autorzy:
Zytkiewicz, Z. R.
Dobosz, D.
Powiązania:
https://bibliotekanauki.pl/articles/1934052.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Df
81.10.Dn
Opis:
Semi-bulk epitaxial layers of GaSb and AlGaSb up to 3 and 1 mm thick, respectively, were successfully grown by the liquid phase electroepitaxy on GaSb substrates. The growth procedure allowed us to achieve high crystallographic perfection as well as compositional uniformity of ternary layers.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 965-968
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Epitaxial Lateral Overgrowth - a Tool for Dislocation Blockade in Multilayer Systems
Autorzy:
Zytkiewicz, Z. R.
Powiązania:
https://bibliotekanauki.pl/articles/1969007.pdf
Data publikacji:
1998-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
81.15.Lm
68.60.Bs
61.72.Ff
Opis:
Results on epitaxial lateral overgrowth of GaAs layers are reported. The methods of controlling the growth anisotropy, the effect of substrate defects filtration in epitaxial lateral overgrowth procedure and influence of the mask on properties of epitaxial lateral overgrowth layers will be discussed. The case of GaAs epitaxial lateral overgrowth layers grown by liquid phase epitaxy on heavily dislocated GaAs substrates was chosen as an example to illustrate the processes discussed. The similarities between our results and those reported recently for GaN layers grown laterally by metallorganic vapour phase epitaxy will be underlined.
Źródło:
Acta Physica Polonica A; 1998, 94, 2; 219-227
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In Situ Monitoring of Electroepitaxial Growth of Thick AlGaAs Layers
Autorzy:
Żytkiewicz, Z. R.
Powiązania:
https://bibliotekanauki.pl/articles/1929752.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Df
81.10.Dn
Opis:
In situ growth monitoring technique has been used to analyse growth disturbances during the liquid phase electroepitaxial growth of thick AlGaAs layers. It allowed us to explain the nature of growth instability occurring at the end of the growth and affecting the maximum thickness of AlGaAs layers obtainable by liquid phase electroepitaxy.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 777-780
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the High Compositional Uniformity of Thick GaAlAs Layers Grown by Liquid Phase Electroepitaxy
Autorzy:
Żytkiewicz, Z. R.
Miotkowska, S.
Powiązania:
https://bibliotekanauki.pl/articles/1923664.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Df
81.10.Dn
Opis:
The results of electroepitaxial growth of thick GaAlAs layers on GaAs substrates are presented. It is experimentally proven that effective convective mixing of the solution volume results in the compositional uniformity of GaAlAs layers, even in spite of the high compositional non-uniformity of the material supplying the solutes (Al, As) to the solution during the growth of the layers. For the first time this allowed us to grow uniform GaAlAs layers with thicknesses up to 200-300 μm in a wide composition range from a small (5 g) amount of solution.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 765-768
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoinduced Defects Creation on Sulfur Passivated Surface of GaAs
Autorzy:
Żytkiewicz, Z. R.
Dobaczewski, L.
Gomez, D.
Briones, F.
Powiązania:
https://bibliotekanauki.pl/articles/1968456.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.Dv
68.45.Da
Opis:
We report on photoinduced defect creation on the sulfurized (100) GaAs surface. The process manifests itself by unrecoverable temporal decrease in the photoluminescence intensity of the GaAs surface treated by (NH$\text{}_{4}$)$\text{}_{2}$S$\text{}_{x}$ solution. The results are discussed in terms of a photoinduced process of the As$\text{}_{Ga}$ antisite generation on the sulfurized surface of GaAs.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 1083-1086
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Substrate Defects Filtration During Epitaxial Lateral Overgrowth of GaAs
Autorzy:
Żytkiewicz, Z. R.
Dobosz, D.
Powiązania:
https://bibliotekanauki.pl/articles/1968454.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
Opis:
Results on the growth of GaAs on (001) GaAs substrates by the epitaxial lateral overgrowth technique are reported. We show that the ratio of normal to lateral growth rates in the epitaxial lateral overgrowth process can be controlled by the crystallographic orientation of the seeds and by Si adding to the melt. Experimental data showing that the dislocations threading from the substrate are efficiently filtered and cannot propagate to the epitaxial lateral overgrowth layers are presented. These findings prove that the epitaxial lateral overgrowth process is the powerful method to grow epilayers with low dislocation density on high dislocation density substrates.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 1079-1082
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System for waste management of acrylic adhesives
Układ do zagospodarowania odpadów z klejów poliakrylanowych
Autorzy:
Zych, K.
Pełech, R.
Łągiewczyk, M.
Czech, Z.
Powiązania:
https://bibliotekanauki.pl/articles/270559.pdf
Data publikacji:
2010
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
odpady
zagospodarowanie odpadów
kleje poliakrylanowe
wastes
waste management
acrylic adhesives
Opis:
The subject of this article is to present a system for disposal the waste acrylic pressure-sensitive adhesives (PSAs), which may occur in industry during production of acrylic adhesives. Poly(alkyl acrylates) play significant role in the industry, which was the impulse to elaborate useful method for recovering waste PSA and to find system, which could be applied in order to recover some of the monomers used in synthesis of PSA. The presented apparatus was tested in laboratory environment, however the results were enough satisfactory and promising that it could be utilize in a larger scale in the future.
Przedmiotem tego artykułu jest przedstawienie układu do zagospodarowania odpadowych samoprzylepnych klejów poliakrylanowych (PSA), które powstają w przemyśle podczas produkcji klejów poliakrylanowych. Poli(alkilo akrylany) odgrywają znaczącą rolę w wielu gałęziach przemysłu, co było bodźcem do opracowania użytecznej metody odzyskiwania odpadowych klejów oraz konstrukcji aparatury, która może być zastosowana do odzysku części monomerów użytych do ich syntezy. Przedstawiona aparatura została zbadana w warunkach laboratoryjnych, jednakże wyniki badań były na tyle satysfakcjonujące i obiecujące, że istnieje możliwość jej zastosowania w przyszłości w skali przemysłowej.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2010, 15, 3; 9-12
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal degradation of poly(alkyl methacrylates) and polyurethane pressure-sensitive adhesives
Autorzy:
Zych, K.
Pełech, R.
Czech, Z.
Powiązania:
https://bibliotekanauki.pl/articles/778075.pdf
Data publikacji:
2010
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
chromatografia
poli(akrylany alkilowe
poliuretany
rozpuszczalnik polimeryzacji
degradacja termiczna
piroliza
chromatography
poly(alkyl acrylates)
polyurethanes
solvent polymerization
thermal degradation
pyrolysis
Opis:
Gas chromatography, coupled with the temperature controlled pyrolysis technique, can be used as a quick method of identification of polymers such as acrylates, methacrylates and polyurethanes. Polymers based on alkyl methacrylates are widely used as construction materials and coatings. Polyurethanes are widely used as self-adhesives, sealants and electrical products (due to polyurethane's low glass transition temperature Tg). The aim of this work is to investigate which products can be obtained from polymethacrylates and polyurethanes.
Źródło:
Polish Journal of Chemical Technology; 2010, 12, 4; 40-43
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geomorphological settings of Polish research areas on Spitsbergen
Autorzy:
Zwoliński, Z.
Giżejewski, J.
Karczewski, A.
Kasprzak, M.
Lankauf, K. R.
Migoń, P.
Pękala, K.
Repelewska-Pękalowa, J.
Rachlewicz, G.
Sobota, I.
Stankowski, W.
Zagórski, P.
Powiązania:
https://bibliotekanauki.pl/articles/295146.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
polar landform
polar geomorphology
glacial relief
postgalacial relief
Polish geomorphological research
Spitsbergen
Opis:
Paper described geomorphological characteristics of landform sets which occur on research areas investigated by Polish geomorphologists on Spitsbergen. These area involve four areas along the western coast of Spitsbergen, i.e. vicinities of the Kaffiøyra, the Werenskioldbreen, the Calypsostranda, and the Hornsund, as wel as one area located in the central part of Spitsbergen, i.e. vicinity of Billefjord with special emphasis on surroundings of the Petuniabkukta. Landforms are characterized in different morphogenetic terms, mainly glacial, peryglacial, deundational, slope, fluvial, even eolian factors and processes.
Źródło:
Landform Analysis; 2013, 22; 125-143
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The geoecological model for small tundra lakes, Spitsbergen
Autorzy:
Zwoliński, Z.
Rachlewicz, G.
Mazurek, M.
Paluszkiewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/295158.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
geoecological model
small tundra lakes
Spitsbergen
Źródło:
Landform Analysis; 2007, 5; 113-118
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of a diet containing beta-carotene and omega-3 fatty acids on the biochemical and nonspecific humoral immunity indicators and on the results of experimental calf rearing
Autorzy:
Zwierzchowski, G.
Micinski, J.
Pogorzelska, J.
Siwicki, A.
Wojcik, R.
Kobzhassarov, T.Z.
Bermagambetova, N.
Shaikamal, G.I.
Fijalkowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1189818.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
animal feeding
diet
beta-carotene
omega-3 fatty acid
biochemical indicator
humoral immunity indicator
immunoglobulin
calf
rearing
Opis:
The aim of this study has been to determine the effect of a diet containing β-carotene and omega-3 fatty acids on the biochemical and nonspecific humoral immunity indicators and on the results of rearing calves to day 60 of life. The study was conducted in 2011-2012, on a herd of Polish Holstein-Friesian cows. 54 calves from the herd were divided into 3 groups, 18 animals in each: CTR, TRT1 and TRT2. During the colostral period lasting for 5 days after birth, calves were drinking the mother’s colostrum. From 6 to 60 days, calves were watered milk replacer formulation. The control group (CTR) consisted of calves after the colostral period given milk replacer formulation without any supplementation. In the two other groups, calves received milk replacers with the supplementation of b-carotene (TRT1 group) in the amount of 25 mg/calf/day or a suspension of liver omega-3 oil (TRT2 group) in the amount of 5g/calf/day. All calves received solid feed ad libitum. The research showed that the parameters of the metabolic profile of calves (ALT, ASP, CHOL, GLU, UREA, ALP, TG, CRE) were within the normal range, indicating good health of the calves. Moreover, the supplementation had a positive impact on the chosen immunological parameters, including a higher IgG concentration, especially at the end of the milk drinking period. The result of B-carotene in a diet was the highest daily gain in the period from 30 to 60 days of life among the analysed groups of calves. No such effect was achieved in the TRT2 group of calves, as their body weight was the lowest. However, noteworthy is the beneficial impact of beta-carotene and omega-3 oil on the non-specific humoral immunity parameters, which was manifested by fewer cases of clinical diarrhoea and upper respiratory tract diseases.
Źródło:
Journal of Elementology; 2016, 21, 1; 283-302
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of a diet containing beta-carotene and omega-3 fatty acids on the biochemical and nonspecific humoral immunity indicators and on the results of experimental calf rearing
Autorzy:
Zwierzchowski, G.
Micinski, J.
Pogorzelska, J.
Siwicki, A.
Wojcik, R.
Kobzhassarov, T.Z.
Bermagambetova, N.
Shaikamal, G.I.
Fijalkowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/14928.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
animal feeding
diet
beta-carotene
omega-3 fatty acid
biochemical indicator
humoral immunity indicator
immunoglobulin
calf
rearing
Opis:
The aim of this study has been to determine the effect of a diet containing β-carotene and omega-3 fatty acids on the biochemical and nonspecific humoral immunity indicators and on the results of rearing calves to day 60 of life. The study was conducted in 2011-2012, on a herd of Polish Holstein-Friesian cows. 54 calves from the herd were divided into 3 groups, 18 animals in each: CTR, TRT1 and TRT2. During the colostral period lasting for 5 days after birth, calves were drinking the mother’s colostrum. From 6 to 60 days, calves were watered milk replacer formulation. The control group (CTR) consisted of calves after the colostral period given milk replacer formulation without any supplementation. In the two other groups, calves received milk replacers with the supplementation of b-carotene (TRT1 group) in the amount of 25 mg/calf/day or a suspension of liver omega-3 oil (TRT2 group) in the amount of 5g/calf/day. All calves received solid feed ad libitum. The research showed that the parameters of the metabolic profile of calves (ALT, ASP, CHOL, GLU, UREA, ALP, TG, CRE) were within the normal range, indicating good health of the calves. Moreover, the supplementation had a positive impact on the chosen immunological parameters, including a higher IgG concentration, especially at the end of the milk drinking period. The result of B-carotene in a diet was the highest daily gain in the period from 30 to 60 days of life among the analysed groups of calves. No such effect was achieved in the TRT2 group of calves, as their body weight was the lowest. However, noteworthy is the beneficial impact of beta-carotene and omega-3 oil on the non-specific humoral immunity parameters, which was manifested by fewer cases of clinical diarrhoea and upper respiratory tract diseases.
Źródło:
Journal of Elementology; 2016, 21, 1
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The indoor radon survey in Serbian schools: can it reflect also the general population exposure?
Autorzy:
Žunić, Z. S.
Bossew, P.
Veselinović, N.
Bochicchio, F.
Carelli, V.
Vaupotič, J.
Čuknić, O.
Simović, R.
Vojinović, Z.
Kisić, D
Tollefsen, T.
Powiązania:
https://bibliotekanauki.pl/articles/148743.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
indoor radon
survey
school
Serbia
Opis:
A systematic indoor radon survey in elementary schools of Serbia is underway since 2008. Its current first phase covers all elementary schools in predominantly rural communities of Southern Serbia. The design of the survey, its implementation and the current state of its realization is shortly described. Part of this paper is devoted to discussion of the question if this survey could produce results representative also of the radon concentration in dwellings and of radon exposure of the general population, discussing some statistical aspects of representativity which arose during the work, namely, if the implementation leads to an unbiased estimate of the targeted quantities.
Źródło:
Nukleonika; 2010, 55, 4; 419-427
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1469

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