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Tytuł:
Semi-supervised vs. supervised learning for mental health monitoring: A case study on bipolar disorder
Autorzy:
Casalino, Gabriella
Castellano, Giovanna
Hryniewicz, Olgierd
Leite, Daniel
Opara, Karol
Radziszewska, Weronika
Kaczmarek-Majer, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/24200683.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
semi supervised learning
mental health monitoring
acoustic features
pattern recognition
AI in medicine
uczenie częściowo nadzorowane
monitorowanie zdrowia psychicznego
cechy akustyczne
rozpoznawanie wzorca
Opis:
Acoustic features of speech are promising as objective markers for mental health monitoring. Specialized smartphone apps can gather such acoustic data without disrupting the daily activities of patients. Nonetheless, the psychiatric assessment of the patient’s mental state is typically a sporadic occurrence that takes place every few months. Consequently, only a slight fraction of the acoustic data is labeled and applicable for supervised learning. The majority of the related work on mental health monitoring limits the considerations only to labeled data using a predefined ground-truth period. On the other hand, semi-supervised methods make it possible to utilize the entire dataset, exploiting the regularities in the unlabeled portion of the data to improve the predictive power of a model. To assess the applicability of semi-supervised learning approaches, we discuss selected state-of-the-art semi-supervised classifiers, namely, label spreading, label propagation, a semi-supervised support vector machine, and the self training classifier. We use real-world data obtained from a bipolar disorder patient to compare the performance of the different methods with that of baseline supervised learning methods. The experiment shows that semi-supervised learning algorithms can outperform supervised algorithms in predicting bipolar disorder episodes.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2023, 33, 3; 419--428
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Psychological Factors Determining the Choice of a Future Job
Autorzy:
Markiewicz, Katarzyna
Kaczmarek, Bożydar
Powiązania:
https://bibliotekanauki.pl/articles/26469814.pdf
Data publikacji:
2013-03-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
vocational career
entrepreneurship
labour market
planning
early adulthood
Opis:
At the time of an economic crisis and its psychological consequences the attitudes and activity of young adults, who are just starting their vocational life, are of great significance. Graduates from colleges and universities are a very important group among them. Their abilities have an impact upon the intellectual potential of the country’s economy, and consequently upon its novelty. The presented research concentrated upon the knowledge of graduates about ongoing changes and tendencies in the labour market, and their ability to communicate their needs in this respect. The study comprised 602 students of the final years of B.A. and M.A. studies, since they are confronted with making a decision concerning their future jobs. Decisions made at that time have a long-lasting influence on the quality of their life. It is therefore worthwhile to acquire better knowledge on the inner motives of their choices.
Źródło:
The New Educational Review; 2013, 31; 255-262
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of NaCl and KCl solutions on deformation of PVA hydrogel – chemo-mechanical coupling
Wpływ roztworów NaCl i KCl na deformację hydrożelu PVA – sprzężenie chemo-mechaniczne
Autorzy:
Kazimierska-Drobny, Katarzyna
Kaczmarek, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/946977.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
hydrogels
PVA
chemo-mechanics
reservoir test
ultrasound
hydrożele
chemo-mechanika
test zbiornikowy
ultradźwięki
Opis:
This paper provides results of studies of chemically induced deformation of PVA [poly(vinyl alcohol)] hydrogels due to interaction with diffusing NaCl and KCl solutions. The experimental studies were carried out in the specially modified reservoir system, where simultaneously registration the changes in the reservoir salt concentration and the deformation under chemical load were applied. The linear model is used to determine the chemo-mechanical coupling parameter. The results showed that PVA hydrogels deform in the presence of salts in pore fluid and the higher the salt concentration the greater deformation is observed.
W pracy przedstawiono wyniki badań chemicznie indukowanej deformacji w hydrożelach poli(alkoholu winylowego) (PVA) pod wpływem oddziaływania z dyfundującymi roztworami NaCl i KCl. Badania obejmowały specjalnie zmodyfikowany test zbiornikowy, w trakcie którego rejestrowano jednocześnie zmiany stężenia soli w zbiorniku i deformację pod obciążeniem chemicznym. Do wyznaczenia parametrów sprzężenia chemiczno-mechanicznego zastosowano liniowy model chemo-deformacji. Stwierdzono, że hydrożele PVA deformują się w obecności soli w płynie porowym, w stopniu zależnym od stężenia soli.
Źródło:
Polimery; 2020, 65, 1; 44-50
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of chitosan after cross-linking by tannic acid
Autorzy:
Sionkowska, Alina
Kaczmarek, Beata
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1035183.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan
cross-linking
mechanical properties
tannic acid
Opis:
Chitosan is widely applied in biomedical and cosmetic fields. For this reason, there is a need to modify this biopolymer to achieve new properties of chitosan-based materials. The properties of chitosan can be modified by several cross-linking methods. In this work, we used the chemical cross-linking of chitosan with tannic acid, after which cross-linked chitosan was shaped into a 3D structure by the lyophilisation process. For the material obtained, FTIR-ATR analysis was performed to characterise the structure of cross-linked chitosan. Moreover, mechanical properties and swelling properties were measured for chitosan before and after cross-linking. The results show that several properties of chitosan can be changed after cross-linking by tannic acid. The positions of bands in the FTIR spectra of chitosan were shifted after cross-linking. Mechanical properties were altered for cross-linked chitosan. However, the highest compressive modulus was observed for pure chitosan. The lowest compressive modulus was observed for chitosan cross-linked with 20 wt% of tannic acid. Swelling behaviour also depends on the cross-linking of chitosan. It decreases for chitosan after cross-linking by tannic acid. Overall, the properties of cross-linked chitosan depend on the amount of tannic acid used for modification. This method of cross-linking can be useful for obtaining materials with specific properties.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2014, 19; 135-138
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CURRENT AND TRADITIONAL VIEWS ON THE BRAIN WORKS
Autorzy:
Kaczmarek, Bożydar L.J
Markiewicz, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/2137723.pdf
Data publikacji:
2018-07-22
Wydawca:
Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
Tematy:
ERPs
neuronal circuits
neuromarkers
neuromodulation
neurofeedback
Opis:
The present paper argues that the development of a new methodology in studying the brain has resulted in a change of our views on the way it works, has seen the emergence of new ideas, and a considerable modification of traditionally accepted theories. The most significant are neuroplasticity, negative activity network (NAT), the nature of aphasic disorders, and the approach to the localization of brain functions. New brain imaging techniques have confirmed also the ability to change the neuronal circuits by mental force. Moreover, new techniques have brought about a rise in new methods for both the diagnosis and rehabilitation of individuals with various brain disorders. Most valuable in this respect has proved to be neurofeedback. We have concentrated on the most important contributions of Prof. Pąchalska in the implementation and development of these new ideas on brain functioning. We also emphasize the fact that her theoretical considerations are firmly based upon her extensive (forty years) work with brain damaged patients.
Źródło:
Acta Neuropsychologica; 2018, 16(2); 201-212
1730-7503
2084-4298
Pojawia się w:
Acta Neuropsychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Political stability as a factor affecting growth in agricultural sub-Saharan African countries
Wpływ stabilności politycznej na wzrost gospodarczy w rolniczych krajach subsaharyjskich
Autorzy:
Świerczyńska, Katarzyna
Kaczmarek, Filip
Kryszak, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/1913227.pdf
Data publikacji:
2020-11-13
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
stabilność polityczna
Afryka Subsaharyjska
rolnictwo
ekonomia instytucjonalna
political stability
sub-Saharan Africa
agriculture
institutional economy
Opis:
The agricultural countries of sub-Saharan Africa remain the least economically advanced region of the world, with the relatively lowest quality of life. The agricultural sector plays a particularly important role in the economies of these countries. However, it is underdeveloped as a result of factors such as inadequate agricultural policy, institutional instability, chronic droughts, epidemics, deterioration of the environment, deteriorating infrastructure and insufficient investment in agricultural research in sub-Saharan Africa. The aim of the paper is to examine the impact of political stabilization on the economic growth in these countries. We were also inclined to determine what the interdependences were between political stability and factors important for agricultural activity for both agricultural and non-agricultural sub-Saharan counties in the 1995–2017 period. The methods used in this research included panel models with fixed effects, non-parametric tests and quantile regression. It was found that stabilizing the political situation and lowering the level of conflict risk contributed to the growth of GDP per capita in both agricultural and non-agricultural countries. However, in agricultural countries, it also influenced the modernization of agricultural production methods and a shift in the proportion of agricultural production in the total volume of imports and exports. Furthermore, it was found that political stability contributed to a greater extent to the improvement of GDP per capita in the lowest income countries.
Kraje rolnicze Afryki Subsaharyjskiej pozostają najmniej zaawansowanym gospodarczo regionem świata, o relatywnie najniższej jakości życia. Szczególne znaczenie w gospodarkach tych krajów ma sektor rolniczy. Jest on jednak słabo rozwinięty, co wynika z czynników takich, jak wadliwa polityka rolna, niestabilność instytucjonalna, chroniczne susze, epidemie, degradacja środowiska, pogorszenie infrastruktury oraz niewystarczające inwestycje w badania naukowe w dziedzinie rolnictwa w Afryce Subsaharyjskiej. Celem artykułu jest zbadanie wpływu stabilizacji politycznej na wzrost gospodarczy w tych krajach. Analizowane były też związki między stabilnością polityczną a czynnikami istotnymi z punktu widzenia działalności rolniczej, zarówno w rolniczych, jak i nie-rolniczych krajach Afryki Subsaharyjskiej w latach 1995–2017. W badaniach wykorzystano modele panelowe z efektami stałymi, testy nieparametryczne oraz regresję kwantylową. Stwierdzono, że stabilizowanie sytuacji politycznej i obniżanie poziomu zagrożenia konfliktem przyczyniało się do wzrostu PKB per capita zarówno w krajach rolniczych, jak i nierolniczych. Niemniej, w krajach rolniczych wpływało także na unowocześnianie metod produkcji rolniczej oraz na zmianę udziału produkcji rolnej w wolumenie importu i eksportu. Ponadto ustalono, że stabilność polityczna przyczyniała się silniej do poprawy PKB per capita w krajach o najniższych dochodach.
Źródło:
Nierówności Społeczne a Wzrost Gospodarczy; 2020, 63; 160-176
1898-5084
2658-0780
Pojawia się w:
Nierówności Społeczne a Wzrost Gospodarczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coping Strategies and COVID-19 Prevalence Among University Students Learning in the Online and Blended Mode
Autorzy:
Markiewicz, Katarzyna
Kaczmarek, Bożydar L.J.
Oryshchyn-Buzhdyhan, Lidiya
Powiązania:
https://bibliotekanauki.pl/articles/2057076.pdf
Data publikacji:
2022-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
country
age
gender
personality
executive functions
Opis:
The study assessed whether students who contracted COVID-19 and did not fall ill differed in coping strategies. The study comprised 111 participants, including 55.9% who were infected and 44.1% who were not. It consisted of online (49.5%) and blended mode learners (50.5%) aged 19 to 31. We used the Brief COPE Inventory to assess ways of coping with stress. Among online students, 65.5% fell ill, while less than half of blended mode learners got sick. Students who contracted COVID-19 were more likely to use maladaptive coping strategies, and respondents who did not become ill were more likely to use adaptive strategies.
Źródło:
The New Educational Review; 2022, 68; 223-234
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Principle Component Analysis and logistic regression to support Six Sigma implementation in maintenance
Autorzy:
Antosz, Katarzyna
Jasiulewicz-Kaczmarek, Małgorzata
Machado, Jose
Relich, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/28328274.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
maintenance management
Six Sigma generation
DMAIC
PCA
logistic regression
Opis:
Improving the efficiency of maintenance processes is one of the goals of companies. Improvement activities in this area require not only an appropriate maintenance strategy but also the use of a new approach to increase the efficiency of the process. This article focuses on using Six Sigma (SS) to improve maintenance processes. As an introduction, the generations of SS development are identified, and traditional and advanced analytical tools that can be useful in SS projects are reviewed. As part of the research, an example of the implementation of the SS project in the maintenance process using the DMAIC and selected advanced analytical methods, such as PCA and logistic regression, was presented. The PCA results showed that it was enough to have seven main components to keep about 84% of the information on variability. In developed logistic regression explained the impact of the individual factors affecting the availability of the machines. The identified factors and their interactions made it possible to define maintenance activities requiring improvements
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 174603
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of personality traits and study mode on mental health and stimulant use among university students during Covid-19 pandemic
Autorzy:
Markiewicz, Katarzyna
Kaczmarek, Bożydar L.J.
Gaś, Zbigniew B.
Powiązania:
https://bibliotekanauki.pl/articles/28762799.pdf
Data publikacji:
2023-09-11
Wydawca:
Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
Tematy:
the COVID-19 pandemic
stimulants
personality traits
emotions
university students
hybrid learning
Opis:
The COVID-19 pandemic has significantly increased feelings of insecurity and anxiety for the health of oneself and those of one’s loved ones, as well as for the future, which has led to an increased level of stress. This has resulted in a tendency to use alcohol and drugs. Studies show that such behaviors are triggered both by external and internal factors. Therefore, the study has looked for interrelations between personality traits, mental state, and learning mode (online versus hybrid) and the frequency of stimulants and tranquilizers consumption in the last 6-12 months of the COVID-19 pandemic. The study involved 113 university students aged 19-34. Due to pandemic-related limitations, 51.3% of students took online courses, while 48.7% were involved in hybrid learning. The participants were all asked to complete an online questionnaire that included 17 questions regarding mental health, drug and alcohol use. Additionally, the TIPI questionnaire was used to assess personality traits. The study found that online learning as well as feelings of loneliness and emptiness resulted in increased use of alcohol, antidepressants and sleeping pills. On the other hand, personality traits such as extraversion, agreeableness and emotional stability helped to limit the use of this type of stimulants. Online learners more often reported deterioration in their mental state, related to difficulties in adapting to pandemic-related conditions. This group was also more likely to use sedatives, sleeping pills, and antidepressants, with a significant difference in means, compared to hybrid students. In contrast, hybrid learners frequently reported a sense of the loss of meaning as well as worrying about the fate of loved ones, thinking back to a situation no longer under their control, and difficulties in making decisions. At the same time, most respondents of this group reported a positive vision of their future and a high sense of responsibility.
Źródło:
Acta Neuropsychologica; 2023, 21(4); 373-386
1730-7503
2084-4298
Pojawia się w:
Acta Neuropsychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of machine learning and rough set theory in lean maintenance decision support system development
Autorzy:
Antosz, Katarzyna
Jasiulewicz-Kaczmarek, Małgorzata
Paśko, Łukasz
Zhang, Chao
Wang, Shaoping
Powiązania:
https://bibliotekanauki.pl/articles/2038009.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
lean maintenance
availability
machine learning
decision trees
rough set theory
Opis:
Lean maintenance concept is crucial to increase the reliability and availability of maintenance equipment in the manufacturing companies. Due the elimination of losses in maintenance processes this concept reduce the number of unplanned downtime and unexpected failures, simultaneously influence a company’s operational and economic performance. Despite the widespread use of lean maintenance, there is no structured approach to support the choice of methods and tools used for the maintenance function improvement. Therefore, in this paper by using machine learning methods and rough set theory a new approach was proposed. This approach supports the decision makers in the selection of methods and tools for the effective implementation of Lean Maintenance.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 4; 695-708
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation, molecular cloning and characterisation of two genes coding chitin deacetylase from mucor circinelloides ibt-83
Autorzy:
Kaczmarek, Michał
Struszczyk-Świta, Katarzyna
Florczak, Tomasz
Szczęsna-Antczak, Mirosława
Antczak, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/1034731.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitin deacetylase
genes
molecular cloning
sequences analysis
Opis:
Chitosan is a linear N-deacetylated derivative of chitin, soluble in acetic solutions. The deacetylation of chitin can be achieved enzymatically using chitin deacetylase (ChDa) (EC 3.5.1.41), which hydrolyses the N-acetamido groups of N-acetyl-D-glucosamine residues in chitin and chitosan. Complementary DNA (cDNA), which encodes ChDa, was isolated from M. rouxii s well as other fungi. Chitin deacetylase activity was detected in partially purified and concentrated crude extract of the protein from Mucor circinelloides IBT-83. Additionally, two open reading frames (ORF), putatively encoding ChDa, were identified and amplified from cDNA of this strain. Each ORF was molecularly cloned and sequenced. Amino acid sequences of ChDaI and ChDaII were predicted, using nucleotide sequences of these cDNA clones, and analysed by means of bioinformatics tools.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 93-103
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Framework of machine criticality assessment with criteria interactions
Autorzy:
Jasiulewicz–Kaczmarek, Małgorzata
Antosz, Katarzyna
Żywica, Patryk
Mazurkiewicz, Dariusz
Sun, Bo
Ren, Yi
Powiązania:
https://bibliotekanauki.pl/articles/1841665.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
machine criticality assessment
assessment criteria
assessment methods
interactions
Opis:
Criticality is considered as a fundamental category of production planning, maintenance process planning and management. The criticality assessment of machines and devices can be a structured set of activities allowing to identify failures which have the greatest potential impact on the company’s business goals. It can be also used to define maintenance strategies, investment strategies and development plans, assisting the company in prioritizing their allocations of financial resources to those machines and devices that are critical in accordance with the predefined business criteria. In a criticality assessment process many different and interacting criteria have to be taken into consideration, despite the fact that there is a high level of uncertainty related to various parameters. In addition, not all assessment criteria are equally important. Therefore, it is necessary to determine the weight of each criterion taking into account different requirements of machine criticality process stakeholders. That is why a novel model of a machine criticality assessment is proposed in this paper. The model extends the existing methods of assessing machines criticality, taking into account not only the importance of machine criticality assessment criteria, but also possible interactions between them.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 2; 207-220
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bacterially expressed truncated F2 domain of Plasmodium falciparum EBA-140 antigen can bind to human erythrocytes
Autorzy:
Rydzak, Joanna
Kryńska, Katarzyna
Suchanowska, Anna
Kaczmarek, Radosław
Łukasiewicz, Jolanta
Czerwiński, Marcin
Jaśkiewicz, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/1039687.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
truncated F2 domain purification
human erythrocyte binding
EBA-140 antigen
Plasmodium falciparum
recombinant F2 domain expression
Opis:
The recently identified erythrocyte binding antigen-140 (EBA-140) is a member of the Plasmodium falciparum DBL family of erythrocyte binding proteins, which are considered as prospective candidates for malaria vaccine development. The EBA-140 ligand is a paralogue of the well-characterized P. falciparum EBA-175 antigen. They share homology of domain structure, including Region II, which consists of two homologous F1 and F2 domains and is responsible for ligand-erythrocyte interaction during invasion. It was shown that the F2 domain of EBA-175 antigen seems to be more important for erythrocyte binding. In order to study activity and immunogenicity of EBA-140 antigen F2 domain, it is necessary to obtain recombinant protein of high purity and in a sufficient amount, which used to pose a challenge due to the high content of disulphide bridges. Here, we present a new method for expression and purification of Plasmodium falciparum EBA-140 antigen F2 domain in E. coli Rosetta-gami strain in fusion with the maltose binding protein (MBP). The truncated F2 domain formed by spontaneous proteolytic degradation of the fusion protein was purified by affinity chromatography on Ni-NTA resin followed by size exclusion chromatography. Molecular mass of this protein was confirmed by mass spectrometry. Its N-terminal amino acid sequencing revealed a proteolytic cleavage site within the F2 domain. The proper folding of the recombinant, truncated F2 domain of EBA-140 antigen was confirmed by circular dichroism analysis. The truncated F2 domain can specifically bind to human erythrocytes but its binding is not as efficient as that of full Region II. This confirms that both the F1 and F2 domains of EBA-140 antigen are required for effective erythrocyte binding.
Źródło:
Acta Biochimica Polonica; 2012, 59, 4; 685-691
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biodegradable polymer coatings on Ti6Al7Nb alloy
Autorzy:
Szewczenko, Janusz
Kajzer, Wojciech
Kajzer, Anita
Basiaga, Marcin
Kaczmarek, Marcin
Antonowicz, Magdalena
Nowińska, Katarzyna
Jaworska, Joanna
Jelonek, Katarzyna
Kasperczyk, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/306476.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Ti6Al7Nb
powłoka polimerowa
zwilżalność
odporność na korozję
uwalnianie jonów
przyczepność
biodegradable polymer coating
wettability
corrosion resistance
ion release
adhesion of polymer coatings
Opis:
The aim of the study was to determine the influence of long term exposure to Ringer’s solution of biodegradable polymer coatings containing an active substance on the Ti6Al7Nb alloy substrate on the physical and chemical properties of the coatings and the degradation process of the metal substrate. The studies used poly(L-lactide-co-trimethylene carbonate) P(L/TMC), poly(L-lactide-co-trimethylene carbonate-glycolide) P(L/TMC/G) and poly(D,L-lactide-glycolide) (PLGA) coatings applied to the anodically oxidized Ti6Al7Nb alloy by means of dipping method (1, 2 and 3 dips). The polymer coatings contained ciprofloxacin. Roughness and wettability tests were carried out on the substrate and polymer coatings, the pitting corrosion resistance of the substrate and samples with polymer coating was determined, the number of metallic ions released to the solution from the coated and uncoated samples was determined as well as the adhesion of polymer coatings. The research was supplemented by microscopic observations. The results of the research indicate different influence of exposure to Ringer’s solution on the physical and chemical properties of biodegradable polymer coatings containing ciprofloxacin and the course of the degradation process of the metal substrate.
Źródło:
Acta of Bioengineering and Biomechanics; 2019, 21, 4; 83-92
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Failure-based sealing reliability analysis considering dynamic interval and hybrid uncertainties
Autorzy:
Sun, Bo
Yang, Xi
Ren, Yi
Wang, Zili
Antosz, Katarzyna
Loska, Andrzej
Jasiulewicz-Kaczmarek, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/1841699.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
reliability analysis
dynamic interval
hybrid uncertainty
physics of failure
sealing
Opis:
In the reliability analysis of a sealing structure, radial clearance of the contact surface is usually regarded as a failure criterion, and the sample size is usually quite small, which brings great challenges to uncertainty quantification. Therefore, this paper proposes a reliability analysis method based on the leakage mechanism of the sealing. With the application of dynamic interval, the proposed method can be used to deal with problem of degradation in small sample to evaluate reliability. Moreover, the dynamic reliability with the mixture of the probabilistic and non-probabilistic variables can be obtained using the proposed method. An illustrative numerical case study of a spool valve is conducted in order to validate the proposed method and the implemented reliability sensitivity analysis. The proposed method is of great help in evaluating and predicting reliability with small degradation sample and hybrid uncertainties.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 2; 278-284
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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