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Wyświetlanie 1-15 z 29
Tytuł:
Content and changes in dissolved organic matter in meadow and arable soils over time
Autorzy:
Rosa, E.
Debska, B.
Pakula, J.
Tobiasova, E.
Powiązania:
https://bibliotekanauki.pl/articles/971316.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
meadow and arable soils
toc
tnt
dissolved organic matter
Opis:
Considering the discrepancies in the reports on seasonal changes in the content of dissolved organic carbon, this paper concerns the research which aimed at defining the content and seasonal changes in dissolved organic matter (DOM) in arable and meadow soils in moderate climate conditions. The research has involved the soils sampled in the kujawsko-pomorskie province (Poland). Gleic Phaeozems (meadow soils), Brunic Arenosols and Eutric Cambisols were sampled from the depth of 0-30 cm, 30-60 cm and 60-100 cm, November 2011 through September 2013. The soil samples were analyzed for dry weight content, pH, content of total organic carbon and total nitrogen. DOM was extracted with 0.004 mol·dm⁻³ CaCl₂, in the extracts the content of dissolved organic carbon (DOC) and dissolved nitrogen (DNt) were assayed. The share of DOC was determined by the soil management. The analysis of variance did not show significant differences in the content of TOC and Nt across the soil sampling dates. Were recorded changes in DOC and DNt between successive sampling dates; for topsoil for DOC – from -12.06% to 13.34% (meadow soils) and for DNt -40.84% to 47.44% (arable soils).
Źródło:
Polish Journal of Soil Science; 2019, 52, 2; 183-194
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The wide band ultrasonic spectroscopy in studying bones and porous implants
Autorzy:
Kubik, J.
Kaczmarek, M.
Pakuła, M.
Powiązania:
https://bibliotekanauki.pl/articles/280297.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
saturated porous bones
implants
ultrasonic waves
phase velocity
attenuation
Opis:
In the paper the method of wide band ultrasonic spectroscopy is applied to determination of the wave velocity and attenuation in a trabecular bovine bone and materials of bone implants. The theory of wave propagation in two-phase fluid saturated porous dissipative media, given by Biot (1956), is used in analysis of wave parameters in bone, instead of the usually applied theory of single-phase media. The analysis of attenuation coefficients and phase velocities of dilatational waves propagating in bovine bones and implants within the frequency range from 0.2 to 1.2 MHz has indicated remarkable influence of the internal structure of the materials on waves parameters. Potential directions of further exploatations of the results are considered.
W pracy przedstawiono zastosowanie metody szerokopasmwej spektroskopii ultradźwiękowej do określenia prędkości i tłumienia fal w wołowej kości gąbczastej i ceramicznych materiałach biozastępczych. Do analizy parametrów propagacji fal, wykorzystano model Biota (1956) dwufazowego ośrodka porowatego nasyconego płynem z uwzględnieniem efektów dysypatywnych w odróżnieniu od zwykle stosowanych dla takich materiałów modeli ośrodków jednofazowych. Otrzymane wyniki dla współczynników tłumienia i prędkości fazowych fal podłużnych w badanych kościach i implantach, w zakresie częstotliwości od 0.2 do 1.2 MHz, wskazują na znaczący wpływ struktury wewnętrznej materiałów na parametry propagacji fal. Rozważono możliwość wykorzystania otrzymanych wyników do oceny mikrostruktury porowatego materiału.
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 3; 579-591
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biomechanics of distal femoral fracture fixed with an angular stable LISS plate
Autorzy:
Pakuła, G.
Słowiński, J.
Ścigała, K.
Powiązania:
https://bibliotekanauki.pl/articles/306403.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
femoral bone
distal femur fractures
finite element method
kość udowa
metoda elementów skończonych
Opis:
Fractures of the distal end of the femur are infrequent and constitute less than 1% of all fractures. Only 3% to 6% of femoral fractures occur at the distal end. The two groups most at risk of the said fractures are young men and older women. The aim of treatment of fractures of the distal femur is to restore normal function of the knee joint. The authors asked themselves whether, following fixation of a 33-C2 fracture (according to the AO classification) with a LISS plate, a rehabilitation program can be undertaken immediately after surgery with the implementation of active movements in the knee joint of the operated limb. In order to answer this question, we created a digital model of a fractured femur fixed with the LISS method. The model was subjected to loads corresponding to the loads generated during active lifting of a limb extended in the knee joint and during flexing of a limb in the knee joint to the 90° angle. Interfragmentary movement (IFM) is one of the key parameters taken into account in the treatment of bone fractures. It allows classification of the treatment in terms of its quality both from the mechanical and histological points of view. We analyzed interfragmentary movement in all fracture gaps. The largest recorded displacement reached in our model was 243 μm, which, in the light of the literature data, should not interfere with bone consolidation, and thus implementation of active movement in the operated knee joint (keeping in mind the simplifications of the experimental method used) is possible in the early postoperative period.
Źródło:
Acta of Bioengineering and Biomechanics; 2013, 15, 4; 57-65
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration parameters of sandwich beams with two types of MR fluid
Parametry drgań belki z cieczami MR o różnej zawartości cząstek ferromagnetycznych
Autorzy:
Romaszko, M.
Pakuła, S.
Sapiński, B.
Snamina, J.
Powiązania:
https://bibliotekanauki.pl/articles/368953.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
belka
ciecz MR
drgania
beam
MR fluid
vibration
Opis:
The study presents the results of laboratory studies on free vibrations of sandwich beams filled with magnetorheological (MR) fluids characterised by various proportions of ferromagnetic particles by weight. Based on the obtained results, it was possible to determine the impact of the content of the particles in question on the natural frequency of free vibrations and the dimensionless damping coefficient of beam.
W pracy przedstawiono wyniki badań laboratoryjnych drgań swobodnych trójwarstwowych belek wypełnionych cieczami magnetoreologicznymi (MR) o różnej zawartości wagowej cząstek ferromagnetycznych. Na podstawie uzyskanych wyników określono wpływ zawartości tych cząstek na podstawową częstotliwość drgań własnych i bezwymiarowy współczynnik tłumienia belki.
Źródło:
Mechanics and Control; 2011, 30, 3; 151-156
2083-6759
2300-7079
Pojawia się w:
Mechanics and Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Clinical evaluation of albendazole in the therapy of human trichinellosis
Ocena kliniczna albendazolu w leczeniu włośnicy człowieka
Autorzy:
Kocięcka, W.
Stefaniak, J.
Kacprzak, E.
Pakuła, M.
Powiązania:
https://bibliotekanauki.pl/articles/2152494.pdf
Data publikacji:
1989
Wydawca:
Polskie Towarzystwo Parazytologiczne
Opis:
Albendazol (Smith Kline, French) zastosowano u 25 chorych na włośnicę. Lek podawano w tabletkach à 200 mg 2 razy po 2 tabletki (800 mg w ciągu doby) przez 6 dni. U 15 chorych (grupa A) z lekkim, poronnym lub bezobjawowym przebiegiem włośnicy stosowano wyłącznie albendazol, natomiast u 10 chorych (grupa B) przeważnie ze średnio ciężkim przebiegiem włośnicy albendazol stosowano łącznie z prednisolonem (w ogólnej dawce od 105 do 240 mg na kurację). U 2 chorych zastosowanie albendazolu w 6 i 7 dniu od zarażenia zapobiegło wystąpieniu objawów chorobowych. U wszystkich chorych (z wyjątkiem 2 osób z grupy A) stwierdzono ustępowanie objawów chorobowych w podobnym czasie, tj. między 3-9 dniem od rozpoczęcia leczenia. Obserwowano wzrost liczby leukocytów i granulocytów kwasochłonnych we krwi obwodowej u 19 chorych w trakcie leczenia albendazolem i u 22 chorych po zakończeniu kuracji. Objawów niepożądanych w przebiegu leczenia nie zanotowano. Skuteczność albendazolu wykazano ogółem u 92% chorych z różnym przebiegiem klinicznym włośnicy. Wstępne badania kliniczne wskazują, że albendazol (Smith Kline, French) jest wartościowym anthelmintykiem i może być zalecany w leczeniu włośnicy.
Źródło:
Wiadomości Parazytologiczne; 1989, 35, 5 Spec.Number; 457-466
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of heat treatment on micro structural changes in aluminium bronze
Autorzy:
Hájek, J.
Křiž, A.
Chocholaty, O.
Pakuła, D.
Powiązania:
https://bibliotekanauki.pl/articles/356861.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium bronzes
heat treatment
microstructure
EDS
corrosion resistance
Opis:
Effect of heat treatment on micro structural changes in aluminium bronze This paper attempts to summarise the niicrostructural changes which take place in aluniiniuni bronzes during heat treatment. Another objective of this study was to map the potential of a certain type of aluminium bronzes for undergoing martensitic transformation. The methods, which were chosen for assessing the results of heat treatment with regard to their availability, included measurement of hardness and observation of inicrostructure using light and scanning electron microscopy. Additional tools for evaluation of microstructure comprised measurement of microhardness and chemical analysis by EDS. An important part of the experiment is observation of microstructural changes in the Joniiny bar during the end-quench test. Upon completing experiments of this kind, one can define the heat treatment conditions necessary for obtaining optimum properties. In addition, the paper presents important findings on how to improve the corrosion resistance of aluminium bronzes by special heat treatment sequences.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1271-1276
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical and ESR Studies of GaN Layers Grown by Metal Organic Chemical Vapour Deposition
Autorzy:
Suchanek, B.
Palczewska, M.
Pakuła, K.
Baranowski, J.
Kamińska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1968425.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ey
73.61.Ey
Opis:
Electrical transport and ESR studies were performed on the state-of-theart GaN layers grown on sapphire substrate using metal organic chemical vapour deposition technique. For undoped samples electron concentration below 2×10$\text{}^{17}$ cm$\text{}^{-1}$ and mobility up to 500 cm$\text{}^{2}$/(V s) were achieved whereas hole concentration up to 7×10$\text{}^{17}$ cm$\text{}^{-3}$ and mobility about 16 cm$\text{}^{2}$/(V s) were obtained for intentionally Mg doped samples and subsequently annealed. Temperature dependence of mobility was discussed. ESR revealed the presence of two resonance absorption lines. One of them with g$\text{}_{⊥}$=1.9487 and g$\text{}_{∥}$=1.9515, commonly observed in n-type GaN was due to shallow donor. The second ESR line was an isotropic one of g=2.0032 and it is discussed.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 1001-1004
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Estimate of the Energy Gap of InN from Measurements of the Fundamental Absorption Edge
Autorzy:
Trautman, P.
Pakuła, K.
Witowski, A. M.
Baranowski, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/2044548.pdf
Data publikacji:
2005-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Ey
78.40.Fy
78.30.Fs
78.66.Fd
81.05.Ea
Opis:
Optical absorption between 0.4 and 4.5 eV of an InN layer grown by metalorganic vapour phase epitaxy on sapphire was measured at 296 and 12 K. The layer was also characterized by measurements of the Hall effect and of infrared reflectivity in the region of the plasma edge, which determined the concentration, mobility, and effective mass of electrons in the conduction band. The energy gap of InN was estimated to be equal to 0.9±0.2 eV. It was obtained from the spectral position of the fundamental absorption edge. Corrections to the energy gap resulting from the broadening of the fundamental absorption edge, from the Burstein-Moss shift, and from a band-gap shrinkage due to the impurity potential were included.
Źródło:
Acta Physica Polonica A; 2005, 108, 5; 903-908
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiband GaN/AlGaN UV Photodetector
Autorzy:
Korona, K. P.
Drabińska, A.
Pakuła, K.
Baranowski, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/2046918.pdf
Data publikacji:
2006-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.40.+w
73.61.Ey
73.40.Kp
Opis:
We present optical and electrical measurements made on GaN/AlGaN photodetector structure capable to detect three UV ranges, tuned by external voltage. The highest band at energy of about 3.85 eV is nearly independent of bias applied to the Schottky contact. Photosensitivity of the second band at about 3.65 eV changes strongly with the bias. Signal in this range increases about 20 times when the bias changes from 0 V to -4 V. Photosensitivity of the third band (3.4 eV) appears for strong reverse bias (-3 V). Characteristics of the detector are in qualitative agreement with numerical model, however deep centers present in the AlGaN layers cause quantitative discrepancies. The concentration of defects of the order of 10$\text{}^{16}$ cm$\text{}^{-3}$ was estimated from current transients.
Źródło:
Acta Physica Polonica A; 2006, 110, 2; 211-217
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and properties of the tool ceramics with hard wear resistant coatings
Autorzy:
Pakuła, D.
Staszuk, M.
Gołombek, K.
Śliwa, A.
Mikuła, J.
Powiązania:
https://bibliotekanauki.pl/articles/351856.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PVD coatings
Nitride Tool Ceramics
Sialon Tool Ceramics
Opis:
This work presents studies of the structure and functional properties of coatings deposited onto indexable inserts made of nitride and sialon tool ceramics with the required properties, i.e. high adhesion, niicrohardness. high resistance to abrasive and diffusion wear in working conditions of high-performance cuttings tools. In the present paper the results of the investigations of the structure, texture, mechanical and functional properties of the Ti(C,N), (Ti.Al)N, Ti(C.N)+(Ti,Al)N coatings were presented. The 80% increase in the hardness of the coatings in comparison to the substrate material was reported. Test coatings are characterized by good adhesion to the substrate. The maximum Lc load of (Ti A1)N coat applied to the substrate from the nitride ceramics is equal to 42 N. In the studied coatings compressive stresses were found. The results of mechanical properties investigations, especially tribological ones correlate with the results of exploitation tests carried out during the cutting test.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1265-1270
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Internal stresses in PVD coated tool composites
Autorzy:
Śliwa, A.
Mikuła, J.
Gołombek, K.
Kwaśny, W.
Pakuła, D.
Powiązania:
https://bibliotekanauki.pl/articles/355303.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analysis and modelling
computational materials science
finite element method
stresses
coatings PVD
Opis:
The aim of work is the investigation of the internal stresses in PVD coated metal matrix composites (MMC). Sintered MMC substrate is composed of the matrix with the chemical composition corresponding to the high-speed steel, reinforced with the TiC type hard carbide phase. Functionally graded composition of MMC providing of high ductility characteristic of steel in the core zone as well as high hardness characteristic of cemented carbides in the surface zone. Internal stresses were determined with use of finite element method in ANSYS environment. The reason of undertaking the work is necessity of develop the research of internal stresses, occurring in the coating, as well as in the adhesion zone of coating and substrate, which makes it possible to draw valuable conclusions concerning engineering process of the advisable structure and chemical composition of coatings. The investigations were carried out on cutting tools models containing defined zones differing in chemical composition. Modelled materials were characteristic of chemical composition corresponding to the high-speed steel at the core, reinforced with the TiC type hard carbide phase with the growing fraction of these phases in the outward direction from the core to the surface, additionally coated with (Ti,Al)N or Ti(C.N) functionally graded PVD coatings. Results of determined internal stresses were compared with the results calculated using experimental X-ray sin2ψ method. It was demonstrated, that the presented model meets the initial criteria, which gives ground to the assumption about its utility for determining the stresses in coatings as well as in functionally graded sintered materials. The results of computer simulations correlate with the experimental results.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1371-1378
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Electrical Properties of High Temperature Annealed Heteroepitaxial GaN:Mg Layers
Autorzy:
Wojdak, M.
Baranowski, J. M.
Suchanek, B.
Pakuła, K.
Jun, J.
Suski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1968449.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Fd
73.61.Ey
78.55.Cr
Opis:
In this paper we present for the first time luminescence and electrical measurements of GaN:Mg heteroepitaxial layers annealed at very high temperatures up to 1500°C and at high pressures of nitrogen up to 16 kbar. The presence of high nitrogen pressure prevents GaN from thermal decomposition. It was found that annealing in the presence of additional Mg atmosphere leads to a high quality p-type epitaxial layer of the hole concentration equal to 2×10$\text{}^{17}$ cm$\text{}^{-3}$ and mobility 16 cm$\text{}^{2}$/(V s). However, annealing at high temperatures without additional magnesium causes conversion to n-type. It is also shown that in the high temperature annealed GaN:Mg epilayers the donor-acceptor luminescence is the dominant recombination channel.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 1059-1062
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deep Level Transient Spectroscopic Studies of MOCVD GaN Layers Grown on Sapphire
Autorzy:
Śliwiński, A. A.
Korona, K. P.
Pakuła, K.
Baranowski, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/1952204.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
73.61.Ey
Opis:
The deep level transient spectroscopy of GaN heteroepitaxial layers grown on sapphire was studied. The samples were Mg doped during the growth. The as-grown material is n-type. It becomes p-type after annealing. The samples were measured in the temperature range from 77 K to 420 K. In n-type GaN, one peak (EG1) with activation energy 0.75 eV was detected. In p-type, at least three peaks were observed: AS1 at temperature about 300 K and AS2, AS3 at about 400 K. The dominating one is AS3. It has an activation energy about 1.1 eV.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 955-958
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time Evolution of the Microluminescence Energy οf GaN/AlGaN Quantum Dots
Autorzy:
Surowiecka, K.
Wysmołek, A.
Stępniewski, R.
Bożek, R.
Pakuła, K.
Baranowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1791354.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.Hc
Opis:
Time evolution of the microphotoluminescence from low-density GaN/$Al_{x}Ga_{1-x}N$ quantum dots grown by metal organic chemical vapor deposition using in situ etching of AlGaN is presented. The observed effect is related to the energy changes that begin immediately after sample illumination with the exciting laser light and saturate after some time. Typically, the luminescence energy decreases and the change is exponential with characteristic times in a range between several dozen and several hundred seconds. However, sometimes we observed the energy increase with characteristic times in a range between several and a few hundred seconds. The obtained results are discussed in terms of the metastable change of the electric field, induced by spontaneous polarization present in GaN/AlGaN structure (in the growth direction), and strain- or defect-induced changes of the electric field in the vicinity of the dot.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 933-935
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single GaN/AlGaN Quantum Dot Spectroscopy
Autorzy:
Surowiecka, K.
Wysmołek, A.
Stępniewski, R.
Bożek, R.
Pakuła, K.
Baranowski, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/2047382.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.Hc
Opis:
Microphotoluminescence of low-density GaN/Al$\text{}_{x}$Ga$\text{}_{1-x}$N quantum dots grown by metal-organic vapor phase epitaxy using in situ etching of AlGaN is presented. The detailed analysis of the emission from these structures enables the observation of pairs of lines separated by the energy up to 3 meV. They behave in a different way under different excitation power that suggests that this doublet structure can be associated with the exciton and trion (or biexciton recombination). It is observed that for different quantum dots the energy of the charged exciton complex emission could be higher or lower than the neutral exciton one. It is discussed in terms of a competition between attractive e-h and repulsive e-e (h-h) Coulomb interaction that occurs because of the existence of the built-in electric field that separates electrons and holes in the dot.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 233-236
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 29

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