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Tytuł:
Force analysis of shoulder joint muscles in the early phase of brain stroke
Autorzy:
Starosta, M.
Kostka, J.
Miller, E.
Powiązania:
https://bibliotekanauki.pl/articles/306827.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
siła mięśni
staw ramienny
udar
dynamometr
muscle force
upper limb
shoulder joint
stroke
dynamometer
Opis:
Upper limb impairment in the early phase of brain stroke is one of the key problems in rehabilitation. An estimation of muscle force can be a helpful factor for functional improvement after a stroke. The primary goals of this study were to determine the muscles with the lowest force in the affected (A) and non-affected (non-A) upper limb. Moreover, the differences between men and women were compared and these values were correlated with age. Methods: One hundred (n = 35 female, n = 65 male) post-stroke patients met the inclusion criteria. The mean age of the study participants was 66.1 years. Muscle force for external and internal rotators of shoulder was measured with handheld dynamometer. Moreover, the correlation coefficients for differences in muscular force with the patient’s age were estimated. Results: Our study reports that the force of the (A) side in relation to the (non-A) was by 37% weaker. We observed about a 40% decrease in the force of the shoulder’s external rotation (female – 42%; male – 41%) and shoulder’s flexion (by 38% – female; 40% – male). Significant correlations between the muscle force and the age of post-stroke patients were also found. It was concluded that about 4 weeks after the first stroke in the patient’s life, the external rotators are the most affected group of shoulder muscles. Conclusions: Neither sex nor the side of the ischemic brain injury influence the muscle force, whereas age determines both muscle force and muscle force deficits. Older post-stroke patients demonstrate fewer deficits in muscle strength than younger ones.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 3; 107-113
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of parameters of grit blasting conducted Dymet® device 412K to obtain roughness
Autorzy:
Szyfelbain, M.
Charchalis, A.
Starosta, M.
Powiązania:
https://bibliotekanauki.pl/articles/244066.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
roughness
blasting
Dymet® 412K gun
alumina
Opis:
There are several fundamental steps for the technological preparation, which are required to optimize the thermal spray coatings. In order to ensure proper bonding of the coating, important is properly preparation of substrate. The surface of the substrate has to be clean and should have a suitable roughness after previously performed treatment. Knowledge about the effects of process parameters allows designing the coatings obtained with an optimal adherence. Only when all the components of the spraying coating process are used correctly there is possible properly design the technology. The article describes the impact of technological parameters of grit blasting to obtain the roughness of the steel substrate (steel S185) to the process of metallic coatings by cold gas dynamic spraying. Research was carried out by using the Dymet® 412K appliance, designed for applying metal coatings and substrate surface cleaning. Grit blasting is a mechanical method of surface preparation of metal parts. It allows obtaining a high degree of surface cleanliness and a determined roughness. The authors took into account parameters such as operational pressure, spray angle (incidence) of abrasive grit blasting in the axis of the stream and feed rate of used abrasive particles (Al2O3) passed to the nozzle of spray gun. Carried out the multiple regression analysis of the roughness parameters results. It revealed the existence of certain influences and changes of process parameters, which affect on the surface quality. Carried out calculations by using a multiple regression showed that the greatest correlation is between the required roughness and the feed rate of used abrasive particles. The studied roughness was described by the parameters: Ra, Rz, Rt and RSm. Stepped growth (from 0.1 to 0.8 g/s) of abrasive particles feed rate caused a decline of all of the roughness parameters. It has been found that the values of the roughness in the least depend on the operational pressure.
Źródło:
Journal of KONES; 2016, 23, 4; 521-526
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of upper limb muscle strength in the early phase of brain stroke
Autorzy:
Starosta, M.
Kostka, J.
Redlicka, J.
Miller, E.
Powiązania:
https://bibliotekanauki.pl/articles/306344.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
siła mięśni
kończyna górna
udar
dynamometr
muscle strength
upper limb
stroke
dynamometer
Opis:
Purpose: The aim of this study was to determine the muscles with the lowest strength in nonaffected (non-A) and affected upper limb (A), to assess differences between men and women and to correlate these values with age in patients after stroke. Methods: Sixty hospitalized in Neurorehabilitation Ward patients (40 male, 20 female), 1-2 weeks after stroke, were enrolled to the study. Their age ranged from 50 to 80 years with a mean (sd) of 65,5 (18,7) years. Muscle force values from upper limb muscles were measured using the MicroFet 2 hand-held dynamometer. The results are displayed in newtons [N], mean values of muscular force, effect sizes and confidence intervals displayed as Cohen’s d and 95% CI were determined. Moreover, we made the coefficients correlation for differences in muscular force versus the Rivermead Motor Assessment (RMA) arm section. Results: Strength of (A) upper limb in comparison to (non-A) was 39% weaker. The severely affected muscle groups were the shoulder flexion 41% (women) versus 46% (men); elbow flexion 39% (women) versus 31% (men); wrist extension 36% (women) versus 42% (men). No significant correlations were found between muscle strength results and RMA or age. Conclusions: Muscle force of (A) upper limb after stroke demonstrates 39% decrease. Men show more significant decrease than women (40% vs 35%). Functional assessment in RMA values show the better results in women (4,9 ± 4,1) than men (3,4 ± 3,2).
Źródło:
Acta of Bioengineering and Biomechanics; 2017, 19, 3; 85-91
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural xenobiotics inducing apoptosis in hepatoma cells: in vitro study
Naturalne ksenobiotyki indukujące apoptozę w komórkach nowotworu złośliwego wątroby - badania in vitro
Autorzy:
Starosta, M.
Tyszka-Czochara, M.
Bukowska-Strakova, K.
Dołhańczuk-Śródka, A.
Powiązania:
https://bibliotekanauki.pl/articles/127107.pdf
Data publikacji:
2018
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
xenobiotics
(+)-catechin
(-)-epigallocatechin gallate
apoptosis
cancer
flow cytometry
ksenobiotyki
(+)-katechina
(-)-galusan epigallokatechiny
apoptoza
nowotwory
cytometria przepływowa
Opis:
The term “xenobiotics” refers to substances which are not produced within the human body, but may occur in human environment. Some of biologically active chemicals may be synthesized by plants. Many studies have been conducted with regard to plant secondary metabolites and the beneficial impact of various plant-derived compounds on human health has been demonstrated. Recent research have shown chemopreventive properties of catechins. (+)-catechin ((2R,3S)-2-(3,4-dihydroxyphenyl)-3,4-dihydro-2H-chromene-3,5,7-triol) and (-)-epigallocatechin gallate (EGCG; [(2R,3R)-5,7-dihydroxy-2-(3,4,5-trihydroxyphenyl)chroman-3-yl] 3,4,5-trihydroxybenzoate) are compounds abundant in daily human nutrition. Growing body of evidence reports pro-apoptotic effects of catechins. Both catechins have been shown to modulate intracellular pathways network in tumor cells thereby regulating signaling cascades, which results in programmed death of cancer cells, apoptosis. Apoptosis is one of the most potent mechanisms to defense against cancer. During apoptosis, the activation of caspases results in biochemical and morphological changes associated with specific changes in cell phenotype. Besides apoptosis, tumor cells may be also eliminated from organism via necrosis, however the latter process may evoke local inflammation, which in turn may result in detrimental effects within the body. Xenobiotics with potential to cause apoptosis of cancer cells may be considered in modern combined anticancer therapies and/or to assist existing treatments.
W środowisku występują substancje obce o charakterze ksenobiotyków, czyli związków chemicznych niesyntetyzowanych w sposób naturalny w ciele człowieka. Wiele takich aktywnych biologicznie związków może być produkowanych przez rośliny. Przeprowadzone dotychczas badania wskazują, że drugorzędowe metabolity roślinne mogą wywierać pozytywny wpływ na zdrowie człowieka. Na przykład wyniki ostatnich obserwacji potwierdziły chemoprewencyjne właściwości katechin. (+)-katechina (ang. (2R,3S)-2-(3,4dihydroxyphenyl)-3,4dihydro-2H-chromene-3,5,7-triol) oraz (-)-galusan epigallokatechiny (ang. EGCG; [(2R,3R)-5,7-dihydroxy-2(3,4,5-trihydroxyphenyl)chroman-3-yl] 3,4,5-trihydroxybenzoate) to związki o charakterze ksenobiotyków występujące w diecie człowieka. Ostatnie odkrycia zwracają uwagę w szczególności na proapoptotyczne właściwości związków z tej grupy. Obydwa wymienione związki chemiczne mogą modyfikować przebieg wewnątrzkomórkowych ścieżek sygnałowych w komórkach nowotworowych. Takie oddziaływanie może uruchamiać kaskadę aktywności prowadzącą do apoptozy, programowanej śmierci komórki neoplastycznej. Apoptoza jest jednym z mechanizmów, które wykorzystuje się w nowoczesnych terapiach przeciwnowotworowych. Apoptozę charakteryzuje szereg zmian w przebiegu procesów biochemicznych i morfologii komórki. Komórki nowotworowe mogą być eliminowane również na drodze nekrozy, jednakże ten typ śmierci komórkowej często prowadzi do lokalnego stanu zapalnego, co jest zjawiskiem niekorzystnym dla organizmu. Drugorzędowe metabolity roślinne, takie jak (+)-katechina i (-)-galusan epigallokatechiny, mogą wykazywać zdolność do wywoływania śmierci apoptotycznej komórek nowotworowych i potencjał ten może być wykorzystywany w nowoczesnych przeciwnowotworowych terapiach kombinowanych lub do wspierania istniejącego leczenia.
Źródło:
Proceedings of ECOpole; 2018, 12, 2; 335-343
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of flame heating parameters on the hardness of hardened C45 steel
Autorzy:
Dargacz, M.
Starosta, R.
Powiązania:
https://bibliotekanauki.pl/articles/244877.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
hardening
flame heating
multiple regression
mathematical optimization
Taguchi method
hartowanie
ogrzewanie płomieniem
wielokrotna regresja
optymalizacja matematyczna
Metoda Taguchi
Opis:
In this article, the impact of selected parameters of heating using a gas torch on the hardness of hardened alloy steels C45 was presented. The staff of the ship's engine room sometimes uses flame hardening during casual repairs of the machines weared as a result of operational extortions. The purpose of emergency repairs is to restore the possibility of work of ship machinery and equipment for the duration of the vessel's journey. An acetylene-oxygen torch was used to heat the steel. As the analysed parameters of the technological process, the heating time and the distance between the nozzle and the workpiece were selected. The values of the mentioned parameters have been selected so that the temperature of hardened steel is in the range from 800 to 1250 oC. The following values of the adopted machining parameters were used: the heating time was 60, 85 and 110 seconds, while the distance of the torch nozzle was 10, 20 and 30 mm. After heating, the samples were cooled by immersing in water. The research was based on a randomized orthogonal experiment plan. The purpose of the quantitative assessment of the influence of heating parameters on the hardness of hardened C45 steel, done statistical analysis variance analysis, multiple regression and mathematical optimization by the Tagichi method. Conducted tests and statistical analysis showed a significant effect of selected parameters of flame heating on the hardness of hardened C45 steel. The greatest influence on the hardness of the steel is the distance between the nozzle and the workpiece. The highest value of hardness was obtained using the following parameters of flame hardening: nozzle distance 30 mm, heating time 60 seconds.
Źródło:
Journal of KONES; 2018, 25, 1; 41-47
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
“CRAWL.PL” Measuring Statistical and Structural Properties of the Polish Web : Technical Report
Autorzy:
Castillo, C.
Starosta, B.
Sydow, M.
Powiązania:
https://bibliotekanauki.pl/articles/92889.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
web crawling
web graph
Page rank
Polish Web
Opis:
This document summarizes the results of an experiment made in the Polish-Japanese Institute of Information Technology, Warsaw, Poland during autumn 2005 and winter 2006. The goal of the project was to collect and analyze large portion of Polish Web documents in order to characterize the structure and other properties of the „.pl” domain. Up to the knowledge of the authors, it was the first publicly reported research experiment of this kind over the Polish Web. The following sections include information about downloaded Web pages, Web sites, and their characteristics. We also present various statistics concerning hosts and domains, as well as the link structure. Among the results of the experiment are the first data sets representing graphs of the Polish Web which will be publicly available for other researchers.
Źródło:
Studia Informatica : systems and information technology; 2007, 1(8); 43-73
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of glucosinolates on the in vitro growth of fungi pathogenic to oilseed rape [Brassica napus L.]
Autorzy:
Waligora, D.
Remlein-Starosta, D.
Korbas, M.
Powiązania:
https://bibliotekanauki.pl/articles/66890.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
oil seed
oilseed rape
glucosinolate
Brassica napus
plant protection
pathogenic fungi
fungi
growth
in vitro
Źródło:
Journal of Plant Protection Research; 2002, 42, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of rape glucosinolates on the growth of two pathogenic fungi species: Fusarium roseum and Rhizoctonia solani
Autorzy:
Waligora, D
Korbas, M.
Remlein-Starosta, D.
Powiązania:
https://bibliotekanauki.pl/articles/65806.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Rhizoctonia solani
oilseed rape
glucosinolate
sulphur-containing glycoside
plant protection
Fusarium roseum
pathogenic fungi
fungi
growth
Opis:
The influence of oilseed rape glucosinolates on the grown in vitro pathogenic fungi was studied. Two pathogenic to oilseed rape fungi species: Fusarium roseum and Rhizoctonia solani were taken into consideration. It was observed that glucosinolates added to the medium limited the growth of both tested fungi to some extent, especially when higher concentrations of glucosinolates was supplied.
Testowano wpływ glukozynolanów wyizolowanych z nasion rzepaku (Brassica napus L.) na wzrost - w warunkach in vitro - dwóch gatunków grzybów patogenicznych porażających tę roślinę: Fusarium roseum i Rhizoctonia solani. Prowadzono hodowle grzybów na pożywce agarowo-ziemniaczanej (AGZ), do której dodawano glukozynolany w stężeniach od 400 do 1000 ppm. Stwierdzono, że glukozynolany ograniczały w pewnym stopniu wzrost pola powierzchni grzybni obu gatunków grzybów - zwłaszcza w wyższych stężeniach. Efekt ten był silniejszy w przypadku grzyba Fusarium roseum.
Źródło:
Journal of Plant Protection Research; 2001, 41, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on template-synthesized polypyrrole nanostructures
Autorzy:
Starosta, W.
Buczkowski, M.
Sartowska, B.
Wawszczak, D.
Powiązania:
https://bibliotekanauki.pl/articles/146221.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
template synthesis
track-etched membranes
polypyrrole nanotubules
Opis:
The paper presents a short review of recent achievements in the rapidly growing field of the template synthesis of nanostructures together with their possible application. The results of our own work, concerning the polypyrrole nanotubules synthesis inside pores of track-etched membranes, have been presented as well. Finally, the kinetics of nanotubule growth process using the SEM method and permeability for air of the resulting structures has been also determined.
Źródło:
Nukleonika; 2006, 51,suppl.1; 35-39
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation synthesis of silver nano- and microparticles in cellulose fibers
Autorzy:
Chmielewska, D. K.
Sartowska, B.
Starosta, W.
Walo, M.
Powiązania:
https://bibliotekanauki.pl/articles/148546.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
silver particles
cellulose
EB irradiation
Opis:
Polymer nanocomposites containing metal nanoparticles have attracted a great interest due to their unique chemical and physical properties. “Green” chemistry promotes application of natural fibers in such structures, among them cellulose is one of the most frequently used. However, cellulose fabric have ability to absorb moisture, so under certain conditions of humidity and temperature they can be subjected to microbial attack. One of the most popular and best known antibacterial agents is silver, which serves as a potential antibacterial material acting against an exceptionally broad spectrum of bacteria including activity against antibiotic-resistant bacteria. Silver nanoparticles (Ag NPs) were grown at the cellulose fibers surface by direct reduction of AgNO3 with electron beam (EB) application. Nanocomposites obtained according to the method described in the text were investigated with X-ray diffraction (XRD), scanning electron microscope with back-scattered electrons detector (SEM-BSE) and energy dispersive spectroscopy (EDS) as well as thermogravimetric analysis (TGA) in order to determine influence of different size silver particles on fibers thermal properties.
Źródło:
Nukleonika; 2010, 55, 3; 345-349
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of fungi affecting root-crops in 1997
Autorzy:
Wisniewska, K
Kubicka, K.
Remlein-Starosta, D.
Rataj-Guranowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/65296.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
root crop
pathogen
plant protection
economic loss
contamination
vegetation
fungi
fungal disease
storage
Opis:
In 1997, supplying Plant Pathogenic Microorganism Collection, microflora of diseased root crops from field and storage was analyzed. Samples from Districts lnspectors of PIOR from area of Poland were received, and 139 isolates of fungi from 369 samples of sugar and forage beat, forage cabbage, forage carrot and potatoes were obtained. The most often fungi from genus Fusarium occurred, and 23.5% of isolates from beet, 14.2% from cabbage, 29.5% from carrot and 48,2% from potatoes were received. The second dominant was species Alternaria alternata, isolated from diseased plants in 28.9%, 50%, 18.5% and 20% respectively. Among saprophytic fungi, species Penicillium and Aspergillus were represented in 9,7% of obtained isolates. Received results suggcsted that Fusarium spp. and Alternaria alternata could be potentially dangerous for root crops as a pathogens or weak pathogens.
W 1997 roku, uzupełniając Kolekcję Mikroorganizmów Patogenicznych dla Roślin, zanalizowano mikoflorę chorych roślin okopowych, pochodzących z upraw polowych i przechowalni, przesyłanych przez Wojewódzkie Inspektoraty PIOR z terenu całego kraju. Wyosobniono łącznie 139 izolatów grzybów z 369 prób roślin buraka cukrowego i pastewnego, kapusty pastewnej, marchwi pastewnej i ziemniaka. Z roślin tych otrzymano odpowiednio 38, 14, 27 i 60 izolatów, w tym 25, 10, 16 oraz 51 stanowiły grzyby patogeniczne, natomiast pozostałe 13, 4, 11 i 9 stanowiły tzw. słabe patogeny i saprofity. Najczęściej izolowano grzyby z rodzaju Fusarium. Stanowiły one 23,5% izolatów wyosobnionych z buraka cukrowego i pastewnego, 14,2% z kapusty pastewnej, 29,5% z marchwi pastewnej oraz 48,2% z ziemniaka. Następny pod względem częstości był gatunek Alternaria alternata, izolowany odpowiednio w 28,9; 50; 18,5; i 20%. Wśród grzybów saprofitycznych wyróżnić należy rodzaj Penicillium i Aspergillus reprezentowane przez około 9,7% izolatów otrzymanych łącznie z wszystkich roślin. Wyniki sugerują, że Fusarium spp. i Alternaria alternata mogą stanowić potencjalne zagrożenie dla roślin okopowych jako grzyby chorobotwórcze lub grzyby określane jako słabe patogeny.
Źródło:
Journal of Plant Protection Research; 2000, 40, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological Properties of AISI 316L Steel Surface Layer Implanted with Rare Earth Element
Autorzy:
Sartowska, B.
Barlak, M.
Waliś, L.
Starosta, W.
Senatorski, J.
Kosińska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402235.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.Qp
68.55.Nq
81.40.Pq
Opis:
Stainless steels with their very good corrosion resistance are used in nuclear, petrochemical, chemical, pulp and paper chemical industries as well as in food processing and others. Unfortunately, poor tribological properties of this kind of steel can be the limitation in the situations in which wear can be responsible for material degradation, like corrosion-erosion. Improvement of the wear resistance of austenitic stainless steels can be achieved using different methods of surface modification, for example: enrichment of the surface layer with reactive elements. Rare earth elements were implanted to AISI 316L austenitic stainless steel using the MEVVA type implanter (65 kV). Different rare earth elements implanted doses: 10¹⁵, 5×10¹⁵, and 5×10¹⁶ ion/cm² were applied. Initial and modified surfaces were investigated using scanning electron microscopy, elemental analysis with the energy dispersive spectroscopy method, X-ray diffraction analysis and the Rutherford backscattered spectroscopy. Tribological properties were investigated using the Amsler method. The most important result was that the surface layers of AISI 316L steel implanted with rare earth elements showed improvement of tribological properties as compared with the initial material.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 923-926
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enrichment of AISI 316L Steel Surface Layer with Rare Earth Elements Using Ion Beams
Autorzy:
Sartowska, B.
Waliś, L.
Starosta, W.
Barlak, M.
Pochrybniak, C.
Kowalska, E.
Powiązania:
https://bibliotekanauki.pl/articles/1400431.pdf
Data publikacji:
2013-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.77.Dq
52.77.-j
72.15.Eb
81.65.-b
Opis:
Enrichment of AISI 316L steel surface layers with rare earth elements was carried out using two methods with ion beam applying. The first one was the ion implantation with the doses in the range of $1 \times 10^{15} cm^{-2}$ up to $5 \times 10^{17} cm^{-2}$ where mishmetal (Ce+La) was used as the ion source. The second method was the high intensity pulsed plasma beams. The plasma pulses contained both ions/atoms of Ce+La from the electrodes material (mishmetal). The pulse energy densities $(3 J/cm^2)$ were sufficient to melt the near surface layer of the steel and introduce those elements into the surface layer. The aim of this work was to investigate the changes of stainless steel surface properties (morphology, rare earth elements concentration, presence of identified phases) after the rare earth elements addition with or without melting. Scanning electron microscopy, energy dispersion spectroscopy, and X-ray diffraction analysis were used for initial and modified surface characterisation. Grazing-incidence X-ray diffraction shows differences in the identified phase presence in the modified surface layer connected with the modification method.
Źródło:
Acta Physica Polonica A; 2013, 123, 5; 822-824
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Composition of Scales Formed on AISI 316 L Steel Alloyed with Ce/La Using High Intensity Plasma Pulses after Oxidation in 1000°C
Autorzy:
Sartowska, B.
Piekoszewski, J.
Waliś, L.
Barlak, M.
Starosta, W.
Pochrybniak, C.
Bocheńska, K.
Powiązania:
https://bibliotekanauki.pl/articles/1503944.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.77.-j
72.15.Eb
81.65.Mq
Opis:
It is well documented that the high oxygen affinity elements such as Y, Ce, La, Er and other rare earth elements added to steel in small amounts can improve their high temperature oxidation resistance. Rare earth elements can be either alloyed during the steel making process or introduced through surface treatment techniques. Improvement of high temperature oxidation resistance of AISI 316 L steel by incorporation Ce and La elements into its near surface region using high intensity pulsed plasma beams in so-called deposition by the pulse erosion mode was investigated in the present work. The samples were irradiated with 3 short (μs scale) intense (energy density $3 J//cm^2$) plasma pulses. Heating and cooling processes occur under non-equilibrium conditions. In all samples the near surface layer of the thickness in μm range was melted and simultaneously doped with cerium and lanthanum. The modified samples were oxidized at 1000°C for 100 h in air. The obtained effects were: oxide scales formed on the treated samples were more fine-grained, compact and adhering better that those formed on the un-treated samples.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 83-86
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of nuclear techniques for characterization of materials surfaces : own investigations examples
Autorzy:
Sartowska, B.
Piekoszewski, J.
Waliś, L.
Starosta, W.
Barlak, M.
Nowicki, L.
Ratajczak, R.
Powiązania:
https://bibliotekanauki.pl/articles/146726.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
conversion electron Mössbauer spectroscopy (CEMS)
nuclear reaction analysis (NRA)
nuclear techniques
surface characterization
surface modification
Opis:
Different methods and techniques for material characterization are often used as a standard procedure for the determination of material properties. Nuclear techniques provide new and more detailed information about the investigated materials. The main goal of the carried out experiments was to improve surface properties including wear, corrosion and high temperature oxidation resistance. Modification processes were carried out using high intensity pulsed plasma beams - HIPPB (106-108 W.cm-2) generated in a rod plasma injector (RPI). In most solid materials such treatment leads to a fast transient melting of the surface layer of the substrate followed by rapid crystallization. Heating and cooling processes are of non-equilibrium type. Initial and modified materials were characterized using different investigation methods including nuclear techniques. Results of the used nuclear techniques such as nuclear reaction analysis (NRA), Rutherford backscattered spectroscopy (RBS) and conversion electron Mössbauer spectroscopy (CEMS) are presented in the paper.
Źródło:
Nukleonika; 2012, 57, 4; 521-528
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł

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