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Tytuł:
"Excitonic" and Photoionization Absorption Spectra of Iron in III-V Materials
Autorzy:
Wysmołek, A.
Tryc, R.
Bożek, R.
Hennel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1924253.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
78.55.Cr
Opis:
We report optical absorption measurements of Fe-doped GaAs, InP and GaP crystals obtained with the help of different doping techniques. In all these crystals photoionization spectra corresponding to Fe$\text{}^{3+}$ → Fe$\text{}^{2+}$ transitions with sharp "excitonic" lines were observed. The intensities of these lines are not proportional to the intensities of photoionization absorption bands, i.e. to the concentration of the Fe$\text{}^{3+}$ centers. Variation of more than one order of magnitude was observed for different semiconductors and for different crystals of the same material. These results suggest that only some iron centers are responsible for the "excitonic" spectra.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 911-913
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
[Rev.] Poezja w sutannie, wybór – opracowanie – komentarz ks. Stefan Radziszewski, Jedność, Kielce 2011, ss. 271, fot.
[Review of the book:] Poets in the Cassock, selection – edition – comments by Father Stefan Radziszewski, Publishing Jednosc, Kielce 2011, pp 271, photos.
Autorzy:
Tytko, Marek Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/951904.pdf
Data publikacji:
2014
Wydawca:
Fundacja Naukowa Katolików Eschaton
Tematy:
ks. Janusz Artur Ihnatowicz
ks. Jerzy Szymik
ks. Janusz A. Kobierski
ks. Wacław Buryła
ks. Stanisław Kobielus
ks. Grzegorz Stachura
ks. Jan Sochoń
ks. Kazimierz Wójtowicz CR
poezja kapłańska
poezja polska
krytyka literacka
polscy poeci katoliccy
teoria literatury
literaturoznawstwo
Father Janusz Artur Ihnatowicz
Father Jerzy Szymik
Father Janusz A. Kobierski
Father Waclaw Buryla
Father Stanislaw Kobielus
Father Grzegorz Stachura
Father Jan Sochon
Father Kazimierz Wojtowicz CR
priest poetry
Polish poetry
literary criticism
Polish Catholic poets
theory of literature
literary studies
Opis:
Autor w tekście przedstawia książkę-antologię poetycką pt. Poeci w sutannie pod redakcją ks. Stefana Radziszewskiego. W książce znajdują się poezje oraz komentarze do własnej poezji autorstwa następujących ośmiu polskich księży poetów: 1) ks. prof. Janusz Artur Ihnatowicz, 2) ks. prof. Jerzy Szymik, 3) ks. Janusz A. Kobierski, 4) ks. Wacław Buryła, 5) ks. prof. Stanisław Kobielus, 6) ks. Grzegorz Stachura, 7) ks. prof. Jan Sochoń, 8) ks. dr Kazimierz Wójtowicz CR.
The author presents the book – an anthology of poetry entitled Poeci w sutannie [Poets in the Cassock] edited by Fr. Stefan Radziszewski. In the book there are poems and comments on their own poetry by eight Polish priests-poets: 1) Fr. Prof. Janusz Artur Ihnatowicz, 2) Fr. Prof. Jerzy Szymik, 3) Fr. Janusz A. Kobierski, 4) Fr. Waclaw Buryla, 5) Fr. Prof. Stanislaw Kobielus, 6) Fr. Grzegorz Stachura, 7) Fr. Prof. Jan Sochon, 8) Fr. Dr Kazimierz Wojtowicz CR (a resurrectionist).
Źródło:
Religious and Sacred Poetry: An International Quarterly of Religion, Culture and Education; 2014, 3(7); 141-148
2299-9922
Pojawia się w:
Religious and Sacred Poetry: An International Quarterly of Religion, Culture and Education
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Model of Radiative Recombination in (In,Al,Ga)N/GaN Structures with Significant Potential Fluctuations
Autorzy:
Dróżdż, P.
Korona, K.
Sarzyński, M.
Czernecki, R.
Skierbiszewski, C.
Muzioł, G.
Suski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1185815.pdf
Data publikacji:
2016-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
73.22.-f
78.47.jd
Opis:
The potential fluctuations in III-nitride quantum wells lead to many effects like emission broadening and S-shape energy vs. temperature dependence. The best description of the energy dependence comes from calculations based on Gaussian density of states. However, in most of the published reports, changes of carrier lifetime with energy and temperature are not taken into account. Since experimental evidence shows that lifetime significantly depends on energy and temperature, here we propose a model that describes two basic parameters of luminescence: lifetime of carries and emission energy as a function of temperature in the case of quantum wells and layers that are characterized by potential fluctuations. Comparison of the measured energy and lifetime dependences on temperature in specially grown InGaN/GaN quantum wells and InAlGaN layer shows very good agreement with the proposed theoretical approach.
Źródło:
Acta Physica Polonica A; 2016, 130, 5; 1209-1212
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new Risk Evaluation Model for safety management on an entire ship route
Autorzy:
Hwang, S.J.
Kobayashi, E.
Wakabayashi, N.
Im, N.
Powiązania:
https://bibliotekanauki.pl/articles/117222.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
safety Management
ship Route
safety Level Analysis
Risk Evaluation Model
safety at sea
Collision Risk (CR)
risk calculation
Opis:
In this paper, we introduce a new risk evaluation model for evaluating the navigation safety zone for an entire ship route. This model considers a new algorithm to determine the navigational safety zone in real-time, and also takes the navigation officers’ perception while navigating a ship into consideration. The risk quantification has been developed using a questionnaire and incorporated into the new model. A simulation was carried out for the Osaka bay area in order to verify the usefulness of the proposed model. A new approach was employed to monitor the level of navigation safety along a ship route. The entire ship route is divided into small sections as a gridded matrix. The level of navigation safety can be quantified by means of a safety index on the basis of the ship’s navigation data within a specified distance range. The results show that the comparison between risks identified for different sections across the entire ship route is easy, which helps determine the navigational safety zone quickly. This model is expected to be able to serve as a new tool for managing safety throughout an entire ship route area in real-time in order to support the port safety authority or vessel traffic service center.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 1; 93-98
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel method for thermodynamic study on the binding of milk carrier protein of BLG-A with Cr+3
Autorzy:
Behbehania, G.R.
Divsalar, A.
Saboury, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/778861.pdf
Data publikacji:
2009
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
BLG-A
Cr+3
izotermiczna kalorymetria miareczkowa
kalorymetria
Cr3+
isothermal titration calorimetry
binding parameters
Opis:
Thermodynamics of the interaction between Cr3+ with β-lactoglobulin type A (BLG-A) was investigated at pH 7.0 and 37°C by isothermal titration calorimetry. A new method to follow the effect of Cr3+ on the stability of BLG-A was introduced. The new solvation model was used to reproduce the enthalpies of BLG-A+ Cr3+ interactions over the whole range of Cr3+ concentrations. The solvation parameters recovered from the new equation are attributed to the structural change of BLG-A and its biological activity. The results obtained indicate that there is a set of two identical binding sites for Cr3+ ions with positive cooperativity. The association equilibrium constants are 14.39 and 0.49 mM-1 for the first and second binding site, respectively. The enthalpy of binding for one mole of Cr+3 ion to one mole of the binding site on BLG-A (ΔH=104.60 kJ mol-1) is obtained.
Źródło:
Polish Journal of Chemical Technology; 2009, 11, 4; 24-29
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Simple Localized-Itinerant Model for PrAl$\text{}_{3}$: Crystal Field and Exchange Effects
Autorzy:
Von Ranke, P. J.
Palermo, L.
Da Silva, X. A.
Powiązania:
https://bibliotekanauki.pl/articles/1891680.pdf
Data publikacji:
1991-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Dg
75.30.Cr
Opis:
We present a simple magnetic model for PrAl$\text{}_{3}$. The effects of crystal field are treated using a reduced set of levels and the corresponding wave functions are extracted from the actual crystal field levels of Pr$\text{}^{+3}$ in a hexagonal symmetry. The exchange between 4f- and conduction-electrons are dealt within a molecular field approximation. An analytical magnetic state equation is derived and the magnetic behaviour discussed. The parameters of the model are estimated from a fitting of the inverse susceptibility of PrAl$\text{}_{3}$ given in the literature.
Źródło:
Acta Physica Polonica A; 1991, 80, 4; 583-590
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Absorption and Emission Properties of Light Emitting Diode Structures Containing GaInN/GaN QWs
Autorzy:
Binder, J.
Korona, K.
Borysiuk, J.
Wysmołek, A.
Baeumler, M.
Köhler, K.
Kirste, L.
Powiązania:
https://bibliotekanauki.pl/articles/1492933.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
72.40.+w
73.61.Ey
Opis:
In this work we present measurements of GaInN/GaN light emitting diodes (LEDs) with an active layer consisting of three quantum wells made of $Ga_{0.9}In_{0.10}N$ that have different widths (1.8 nm, 2.7 nm, 3.7 nm). A comparison of emission and absorption (photocurrent) on the same sample revealed a shift in energy, with the emission energy being significantly lower. The shifts are about 0.02 eV, 0.03 eV, and 0.04 eV for the quantum wells having the widths of 1.8 nm, 2.7 nm, and 3.7 nm, respectively. This can be explained by a shift of the ground state energy caused by the quantum confined Stark effect. Calculations show that due to the spontaneous polarization and the piezoelectric effect a strong electric field of the order of 1 MV/cm was present in the GaInN quantum wells. Simulations of ground-state energies in the model of an infinite square well under the influence of an electric field with a matched effective well width were performed and used to interpret the experimental results.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 918-920
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AC Susceptibility Studies of Phase Transitions and Magnetic Relaxation: Conventional, Molecular and Low-Dimensional Magnets
Autorzy:
Bałanda, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399022.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Cr
75.30.Kz
75.40.Gb
75.50.-y
Opis:
The paper presents the review of AC susceptibility measurements in study of magnetic phase transitions and spin dynamics. Examples of several types of phase transitions in conventional and molecular magnets are shown. The phenomenon of magnetic relaxation is briefly ascribed and illustrated with results on relaxation in low-dimensional molecular magnets, such as single molecule magnets, single chain magnets and quasi 1-dimensional systems showing magnetic phase transition to the long-range ordered phase. The following experimental possibilities of the AC technique, which allow to get insight into properties of novel magnetic materials are mentioned: (i) change of the AC field amplitude (in order to distinguish ferro-(ferri) and antiferromagnets); (ii) use of a static field H_{DC} (to conclude on the type of magnetic order and to study the phase diagram); (iii) measurement of nonlinear susceptibilities (to conclude on the type of phase transition); (iv) probing the dependence of both components of susceptibility on frequency of the AC field (to study magnetic relaxation); (v) tests of the DC field effect on the frequency dependence of χ_{AC} (to analyze the possibility of blocking or reentrant spin-glass transition).
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 964-976
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of Cr(VI) by Natural Clinoptilolite Zeolite from Aqueous Solutions: Isotherms and Kinetics
Autorzy:
Jorfi, S.
Ahmadi, M. J.
Pourfadakari, S.
Jaafarzadeh, N.
Soltani, R. D. C.
Akbari, H.
Powiązania:
https://bibliotekanauki.pl/articles/778561.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Adsorption
Clinoptilolite Zeolite
Cr(VI)
Isotherm
Reaction Kinetics
Opis:
The main aim of this study was to evaluate the efficiency of natural zeolite for Cr(VI) removal from aqueous solutions. Following simple modification of adsorbent, the effect of operational parameters including pH (2–10), adsorbent dosage (2–20 g/L), contact time (5–150 min) and Cr(VI) concentration (10–50 mg/L) were studied according to one-factor-at-a-time procedure. The maximum Cr(VI) removal of 99.53% was obtained at initial pH of 2, contact time of 30 min, adsorbent dosage of 8 g/L and initial chromium concentration of 10 mg/L. The Freundlich isotherm was best fitted with experimental data (R2 = 0.951). Also, type 1pseudo second order kinetic model showed the most correlation (R2 = 1) with the experimental data. According to obtained results, it can be concluded that the application of clay-like adsorbents such as natural clinoptilolite zeolite can be considered as an efficient alternative for final treatment of effluents containing Cr(VI).
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 3; 106-114
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AHP QFD methodology for a recycled solar collector
Autorzy:
El-Badaoui, Meryem
Touzani, Abdellatif
Powiązania:
https://bibliotekanauki.pl/articles/23966561.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
AHP
QFD
badanie rynku
solarny podgrzewacz powietrza z recyklingu
współczynnik konsystencji „CR”
market research
recycled solar air heater
weights of criteria
consistency ratio “CR
Opis:
As it is presented in literature, the AHP-QFD method is a method applicable to many sectors, namely industry. The article is a part of this framework, applying this method for the design of a recycled solar air heater according to customer’s expectations. The methodology is based on the application of QFD to detect consumer requirements, technical characteristics and their relationship matrices. while the AHP method aims to evaluate the weights of each criterion in order to make the right decision. In this study, the manufacturing process was projected from upstream to downstream, as well as a market study was established in October 2020, in Khouribga-Morocco, in which 50 people responded favourably to a survey about the most frequently searched requirements which include size, efficiency, design, price and ecology as well as their importance in a solar collector. Besides, relationship matrices and the weight matrices of the technical criteria have been established, by presenting a consistent ratio “CR” less than 10% showing the consistency of the assessment, and finally a priority given to the characteristics of the recycled solar air heater: cans and thermal insulation more superior to the others characteristics.
Źródło:
Production Engineering Archives; 2022, 28, 1; 30--39
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AlGaAs to GaAs Energy Transfer Mechanisms in AlGaAs/GaAs Structures
Autorzy:
Karpińska, K.
Godlewski, M.
Żytkiewicz, Z. R.
Chen, W. M.
Weber, E. R.
Powiązania:
https://bibliotekanauki.pl/articles/1921617.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Jv
76.70.Hb
78.55.Cr
Opis:
The results of photoluminescence and optically detected cyclotron resonance experiments are presented for thick AlGaAs epilayers grown by liquid phase electroepitaxy method on GaAs:Cr substrate. These results indicate an efficient energy transfer from excited AlGaAs to GaAs.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 713-716
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AlGaN Quantum Well Heterostructures for Mid-Ultraviolet Emitters with Improved Room Temperature Quantum Efficiency
Autorzy:
Shevchenko, E.
Toropov, A.
Nechaev, D.
Jmerik, V.
Shubina, T.
Ivanov, S.
Yagovkina, M.
Pozina, G.
Bergman, J.
Monemar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1376069.pdf
Data publikacji:
2014-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.De
78.55.Cr
71.35.-y
78.66.-w
Opis:
We report on optical studies of exciton localization and recombination kinetics in two single 2.2 nm thick $Al_{x}Ga_{1-x}N$/$Al_{x+0.1}Ga_{0.9-x}N$ quantum well structures (x=0.55 and 0.6) grown by plasma assisted molecular beam epitaxy on a c-sapphire substrate. Strong localization potential inherent for both the quantum well and barrier regions results in merging of the quantum well and barrier emission spectra into a single broad line centered at 285 nm (x=0.55) and 275 nm (x=0.6). Time-resolved photoluminescence measurements revealed surprising temperature stability of the photoluminescence decay time constant ( ≈ 400 ps) relevant to the recombination of the quantum well localized excitons. This observation implies nearly constant quantum efficiency of the quantum well emission in the whole range from 4.6 to 300 K.
Źródło:
Acta Physica Polonica A; 2014, 126, 5; 1140-1142
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alteration of mélange-hosted chromitites from Korydallos, Pindos ophiolite complex, Greece: evidence for modification by a residual high-T post-magmatic fluid
Autorzy:
Kapsiotis, A. N.
Powiązania:
https://bibliotekanauki.pl/articles/138612.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ferrian chromite
Cr-spinel
metamorphism
Ophiolites
Pindos
spinel Cr
metamorfizm
ofiolity
Opis:
The peridotites from the area of Korydallos, in the Pindos ophiolitic massif, crop out as deformed slices of a rather dismembered sub-oceanic, lithospheric mantle section and are tectonically enclosed within the Avdella mélange. The most sizeable block is a chromitite-bearing serpentinite showing a mesh texture. Accessory, subhedral to euhedral Cr-spinels in the serpentinite display Cr# [Cr/(Cr + Al)] values that range from 0.36 to 0.42 and Mg# [Mg/(Mg + Fe2+)] values that vary between 0.57 and 0.62, whereas the TiO2 content may be up to 0.47 wt.%. The serpentinite fragment is characterized by low abundances of magmaphile elements (Al2O3: 0.66 wt.%, CaO: 0.12 wt.%, Na2O: 0.08 wt.%, TiO2: 0.007 wt.%, Sc: 4 ppm) and enrichment in compatible elements (Cr: 2780 ppm and Ni: 2110 ppm). Overall data are in accordance with derivation of the serpentinite exotic block from a dunite that was formed in the mantle region underneath a back-arc basin before tectonic incorporation in the Korydallos mélange. Two compositionally different chromitite pods are recognized in the studied serpentinite fragment, a Cr-rich chromitite and a high-Al chromitite, which have been ascribed to crystallization from a single, progressively differentiating MORB/IAT melt. Although both pods are fully serpentinized only the Al-rich one shows signs of limited Cr-spinel replacement by an opaque spinel phase and clinochlore across grain boundaries and fractures. Modification of the ore-making Cr-spinel is uneven among the Al-rich chromitite specimens. Textural features such as olivine replacement by clinochlore and clinochlore disruption by serpentine indicate that Cr-spinel alteration is not apparently related to serpentinization. From the unaltered Cr-spinel cores to their reworked boundaries the Al2O3 and MgO abundances decrease, being mainly compensated by FeOt and Cr2O3 increases. Such compositional variations are suggestive of restricted ferrian chromite (and minor magnetite) substitution for Cr-spinel during a short-lived but relatively intense, low amphibolite facies metamorphic episode (temperature: 400–700 °C). The presence of tremolite and clinochlore in the interstitial groundmass of the high-Al chromitite and their absence from the Cr-rich chromitite matrix imply that after chromitite formation a small volume of a high temperature, post-magmatic fluid reacted with Cr-spinel, triggering its alteration.
Źródło:
Acta Geologica Polonica; 2014, 64, 4; 473-494
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza materiałoznawcza deimplantowanego elementu endoprotezy stawu biodrowego
Material analysis of the deimplanted element of hip joint endoprosthesis
Autorzy:
Płatek, Marta
Dudek, Agata
Ucieklak, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/285276.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
endoprotezoplastyka stawu biodrowego
trzpień endoprotezy
rewizja
stop Co-Cr-Mo
hip joint endoprosthesis
stem of endoprosthesis
revision
Co-Cr-Mo alloy
Opis:
Pomimo postępu jaki dokonał się w ostatnich latach w zakresie endoprotezoplastyk stawu biodrowego jednym z nierozwiązanych do końca zagadnień pozostaje problem aseptycznych i septycznych obluzowań elementów endoprotez. Dlatego stale trwają poszukiwania rozwiązań pozwalających zminimalizować ryzyko zapaleń okołoprotezowych i aseptycznych obluzowań endoprotez. Przedmiotem badania był trzpień endoprotezy Mittelmeiera usunięty z powodu aseptycznego obluzowania po 16 latach od wszczepienia. Przeprowadzano analizę strukturalną wykorzystując mikroskop świetlny i skaningowy oraz zbadano skład chemiczny materiału, z którego wykonano implant. Dokonano również oceny stopnia degradacji jego powierzchni. Analiza składu chemicznego porównana do pierwotnego składu tego trzpienia ujawniła, iż bezpośredni kontakt implantu z płynami ustrojowymi i żywą tkanką wpływa na zmianę ilościową poszczególnych pierwiastków. Mikroskopia skaningowa elektronowa ujawniła na metalowym trzpieniu liczne wżery, pęknięcia oraz ubytki powstałe na skutek zużycia oraz korozji. Wykonane badania wykazały, że nie tylko implant osadzony w kości oddziałuje na okoliczne tkanki, ale zachodzą zmiany również w obrębie wszczepionego implantu. Bezpośrednią przyczyną obluzowania implantu była osteoliza związana z nagromadzeniem w przestrzeni pomiędzy implantem a kością elementów zużycia korozyjnego i erozyjnego. Na podstawie zebranych danych z Oddziału Chirurgii Urazowo-Ortopedycznej Szpitala Czerniakowskiego Sp. z o.o. w Warszawie wykonano ponadto analizę statystyczną przeprowadzonych endoprotezoplastyk pierwotnych i rewizyjnych oraz występujących powikłań, ze szczególnym uwzględnieniem obluzowań elementów endoprotez, które wymagały operacji rewizyjnych.
Despite the progress that has been made in recent years in the field of hip joint endoprostheses, the problem of aseptic and septic loosening of endoprosthetic elements remains one of the unresolved issues. Therefore, the research on solutions to minimize the risk of periprosthetic inflammations and aseptic loosening of endoprostheses is still ongoing. The subject of the study was a stem of the Mittelmeier’s endoprosthesis removed due to its aseptic loosening after 16 years of implantation. The structural analysis was carried out using a light and scanning microscope and the chemical composition of the implant material was examined. The analysis of the chemical composition compared to the original composition of the stem revealed that direct contact of the implant with body fluids and living tissue affects the quantitative change of individual elements. Scanning electron microscopy revealed numerous pitting, cracks and losses caused by wear and corrosion on the metal stem. The research carried out showed that not only does the implant inserted in the bone affect the surrounding tissue, but there are also changes within the implanted prosthesis. The direct cause of the implant loosening was osteolysis in the space between the implant and the bone, associated with the accumulation of elements of corrosion and erosion wear. Based on the collected results from the Trauma and Orthopaedic Surgery Department of the Czerniakowski Hospital in Warsaw, a statistical analysis of primary and revision endoprostheses and complications was performed, with particular emphasis on the loosening of the endoprostheses elements that required revision surgeries.
Źródło:
Engineering of Biomaterials; 2019, 22, 150; 2-9
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wpływu parametrów procesowych na transport chromu(III) w układzie z immobilizowaną membraną ciekłą
Analysis of process parameters influence on chromium(III) transfer in a system with supported liquid membrane
Autorzy:
Religa, P.
Gawroński, R.
Sobczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/2070739.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
DNNSA
SLM
Cr(III)
Opis:
W pracy zbadano wpływ stężenia przenośnika, wpływ temperatury oraz pH fazy zasilającej na kinetykę procesu transportu jonów chromu (III) przez ciekłe membrany unieruchomione stosując jako przenośnik kwas dinonylonaftalenosulfonowy (DNNSA). Wyraźny wpływ badanych parametrów na kinetykę transportu wskazuje, iż optymalne właściwości membran ciekłych ograniczone są do wąskiego przedziału parametrów procesowych charakterystycznych dla danego przypadku.
An influence of temperature, pH in the feed phase and carrier concentration in membrane on kinetics of chromium(III) ions transport through the supported liquid membrane consisting as a carrier di-no nylnaphtalenesulfonic acid (DNNSA) was investigated. A visible influence of each parameter on transport kinetics was observed. Optimum properties of liquid membrane are strongly restricted by process parameters, which are characteristic for a given case.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 5; 97-98
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł

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