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Tytuł:
Self-reported medication administration errors in clinical practice of nurses: a descriptive correlation study
Autorzy:
Červený, Martin
Hajduchová, Hana
Brabcová, Iva
Chloubová, Ivana
Prokešová, Radka
Malý, Josef
Malá-Ládová, Kateřina
Doseděl, Martin
Tesař, Ondřej
Vlček, Jiří
Tóthová, Valérie
Powiązania:
https://bibliotekanauki.pl/articles/2203024.pdf
Data publikacji:
2023-05-19
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
nursing
patient safety
drug
safety management
errors
medication administration
Opis:
Background Medication administration errors (MAE) are a worldwide issue affecting the safety of hospitalized patients. Through the early identification of potential causes, it is possible to increase the safety of medication administration (MA) in clinical nursing. The study aimed to identify potential risk factors affecting drug administration in inpatient wards in the Czech Republic. Material and Methods A descriptive correlation study through a non-standardized questionnaire was used. Data were collected from September 29 to October 15, 2021, from nurses in the Czech Republic. For statistical analysis, the authors used SPSS vers. 28 (IBM Corp., Armonk, NY, USA). Results The research sample consisted of 1205 nurses. The authors found that there was a statistically significant relationship between nurse education (p = 0.05), interruptions, preparation of medicines outside the patient rooms (p < 0.001), inadequate patient identification (p < 0.01), large numbers of patients assigned per nurse (p < 0.001), use of team nursing care and administration of generic substitution and an MAE. Conclusions The results of the study point to the weaknesses of medication administration in selected clinical departments in hospitals. The authors found that several factors, such as high patient ratio per nurse, lack of patient identification, and interruption during medication preparation of nurses, can increase the prevalence of MAE. Nurses who have completed MSc and PhD education have a lower incidence of MAE. More research is needed to identify other causes of medication administration errors. Improving the safety culture is the most critical challenge for today’s healthcare industry. Education for nurses can be an effective way to reduce MAEs by enhancing their knowledge and skills, mainly focusing on increasing adherence to safe medication preparation and administration and a better understanding of medication pharmacodynamics. Med Pr. 2023;74(2):85–92
Źródło:
Medycyna Pracy; 2023, 74, 2; 85-92
0465-5893
2353-1339
Pojawia się w:
Medycyna Pracy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bomb Calorimetric Correlation Study between Chemical Structure and Enthalpy of Formation for a Linear Energetic Polyphosphazene
Autorzy:
Bellamy, A. J.
Contini, A. E.
Golding, P.
Powiązania:
https://bibliotekanauki.pl/articles/358199.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
PBX technology
energetic polyphosphazenes
bomb calorimetry
enthalpy of combustion
enthalpy of formation
Opis:
Energetic polyphosphazenes constitute a novel class of insensitive binders which potentially outperform conventional carbon-based systems in terms of their energy-densities and glass transition temperatures. To facilitate the calculation of energetic performance for these materials, we report here on the use of bomb calorimetry to determine the standard enthalpies of combustion (ΔcH°) and formation (ΔfH°) of 2,2,2-trifuoroethan-1-oxy-/2,3-dinitratopropan-1-oxy-polyphosphazene (I) as the proportion of (energetic) 2,3-dinitratopropan-1-oxy substituents (% Energetic Substitution, % ES) is varied between 31% and 78%. Similar data is presented for the parent polymer bis(2,2,2-trifuoroethan-1-oxy)-polyphosphazene (II) (% ES = 0). ΔcH° was found to vary between -2275 kJ·mol-11for the parent polymer II (% ES = 0) and -3415 kJ·mol-1 for I with % ES = 78. The corresponding values for ΔfH° were -3184 kJ·mol-1 and -1566 kJ·mol-1. These data indicate that, as expected, the polymer heats of formation become more favourable – with respect to the energetic performance of the polymer – as the percentage of energetic side chain functionalities (% ES) increases.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 1; 3-15
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perturbed Angular Correlation Study of Fe/Cr (1 0 0) and Fe/Co (1 -1 0) Multilayers
Autorzy:
Meersschaut, J.
Swinnen, B.
Dekoster, J.
Rots, M.
Powiązania:
https://bibliotekanauki.pl/articles/1953183.pdf
Data publikacji:
1997-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
75.70.Fr
75.50.Rr
Opis:
Recently we completed the very first and detailed perturbed angular correlation investigation on MBE-grown very thin film multilayers. The present paper aims to show that otherwise rather unaccessible but unique information on the (interface) magnetism could be obtained. For the Fe/Cr(1 0 0) multilayer system we observe, below a critical Cr thickness of 5.0 nm, a collapse of the spin-density-wave ordering in chromium. While the magnetization in the Fe-layer is in-plane, the Cr magnetization in thicker layers is out-of-plane. In the Fe/Co (1 -1 0) system, the observation of transferred magnetic hyperfine field satellites and their temperature dependence leads to the determination of an oscillating magnetic moment profile at the Fe/Co interface as well as a structure model for the superlattice.
Źródło:
Acta Physica Polonica A; 1997, 91, 1; 217-220
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three types of intelligences and their relationship to students’ school performance
Autorzy:
Kaliská, Lada
Powiązania:
https://bibliotekanauki.pl/articles/2011803.pdf
Data publikacji:
2015-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
emotional intelligence
social intelligence
general intelligence
academic achievement
correlation study
Opis:
The contribution examines three types of intelligences (emotional, social and general) in relation to school performance of secondary school students (N=169). Empirical analysis indicated its zero to weak negative correlations (0.01≤R≤0.30) with factors, dimensions and global emotional intelligence measured by the Trait Emotional Intelligence Questionnaire-Adolescence Form (TEIQue–AF, Petrides, 2001) and weak negative correlations (0.18≤R≤0.29) with dimensions of social intelligence measured by The Tromso Social Intelligence Scale (TSIS, Silver, et al., 2001). On the other hand, the general intellect assessed by the non–verbal standardized Test of Intellectual Potential (TIP, Říčan, 1971) had a moderately negative relationship with school performance expressed by an average of marks in Mathematics (R=–0.39**).
Źródło:
The New Educational Review; 2015, 41; 275-286
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economic openness versus economic growth: a correlation study in long-term and short periods based on a selection of European Union countries
Autorzy:
Machowska-Okrój, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/969922.pdf
Data publikacji:
2016
Wydawca:
Akademia Ignatianum w Krakowie
Tematy:
Economic growth
economic openness factor
correlation research
positive dependency
Opis:
Objective: The objective of this paper is to show the connection between economic openness with economic growth and attempt to answer the following question: Did the accession to EU had any affect on correlation between economic growth and the economic openness? Research Design & Methods: The research method adopted here was a study of correlation among the variables. Program "Statistica" have been used to study this correalation. Economic growth plays the role of a dependent variable and is estimated according to GDP. An economy’s openness is an independent variable and is estimated by the openness factor calculated using this formula: the sum of exports and imports divided by GDP. Findings: Not all research agrees with the idea of the positive influence of openness in the economy on economic growth. In 2004, the former ‘Eastern Bloc’ countries (Czech Republic, Estonia, Hungary, Lithuania, Latvia, Poland, Slovak Republic, Slovenia) joined the European Union, offering an opportunity to study the effects of accession. Implications & Recommendations: The study has been divided into two phases. The first phase examines the relation between the economic growth rate and the openness factor for the 24 countries which were members of the EU in 2004. The results show a positive correlation between the studied variables. Afterwards, each of the eight listed countries were researched concerning two time periods: the first from before their accession to the EU and the second after their accession to the EU. Correlation research does not satisfactorily settle this aspect. In the second phase of the study, a longer time horizon was allowed and the former Eastern Bloc countries were researched again. The results were explicit and credible. A positive and statistically substantial correlation for the researched countries was achieved. Contribution & Value Added: On the basis of the conducted research the following conclusions were drawn.An analysis of the correlation between economic growth and economic openness shows a positive dependency with the following assumptions: the researched group consists of the 24 EU countries in 2004 and the research is done within the 2004-2015 period.The twice-run correlation research for the time periods 1995-2004 and 2004-2015 respectively and for the eight selected countries does not present explicit results. Consequently, it cannot be concluded that accession to the EU has positively influenced the correlation between economic growth and economic openness.The correlation research for 1995-2015 and the eight selected countries do confirm the popularity of the idea of the positive influence of the economic openness on economic growth.
Źródło:
Horyzonty Polityki; 2016, 7, 21; 141-165
2082-5897
Pojawia się w:
Horyzonty Polityki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie korelacji właściwości termicznych i wytrzymałościowych kompozytów gipsowych modyfikowanych mikrosferami
Correlation study of thermal and strength properties of gypsum composites modified with microspheres
Autorzy:
Ciemnicka, Justyna
Prałat, Karol
Powiązania:
https://bibliotekanauki.pl/articles/129401.pdf
Data publikacji:
2020
Wydawca:
PWB MEDIA Zdziebłowski
Tematy:
hydroksyetylometyloceluloza
ciepło hydratacji
gips modyfikowany
kalorymetria
hydroxyethyl methyl cellulose
hydration heat
modified gypsum
calorimetry
Opis:
W pracy przedstawiono dane eksperymentalne dotyczące wpływu dodatku mikrosfer na wytrzymałość oraz przewodnictwo cieplne gipsu budowlanego. Zastosowano dodatek w ilości 5%, 10% oraz 15% masowych w stosunku do masy suchego proszku gipsowego. Uzyskane wyniki pozwoliły stwierdzić, że zastosowanie mikrosfer zmniejsza w znaczącym stopniu wartości współczynnika przewodzenia ciepła kompozytów gipsowych. Jednocześnie sprawdzono wpływ dodatku na wytrzymałość modyfikowanego gipsu na ściskanie oraz zginanie. Zaobserwowano spadek odporności kompozytu na działanie siły ściskającej oraz zginającej.
The paper presents experimental data on the impact of the addition of microspheres on the strength and thermal conductivity of building gypsum. An amount of 5%, 10% and 15% by mass of the dry gypsum powder was used. The results obtained show that the use of microspheres significantly reduces the value of the thermal conductivity of gypsum composites. At the same time, the influence of the additive on the strength of the modified plaster on compression and bending was tested. A decrease in the composite's resistance to compressive and bending forces was observed.
Źródło:
Builder; 2020, 24, 6; 24-25
1896-0642
Pojawia się w:
Builder
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and spectral correlation study of some 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-yl-ethanones
Autorzy:
Thirunarayanan, G.
Ravi, K.
Powiązania:
https://bibliotekanauki.pl/articles/412390.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Solvent-free cyclization cum acetylation
N-acetyl pyrazoles
IR spectra
NMR spectra
Hammett correlations
Opis:
Some N-acetyl pyrazoles including 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-yl-ethanones have been synthesised by solvent free cyclization cum acetylation of chalcones including substituted styryl 3,4-dichlorophenyl ketones using hydrazine hydrate and acetic anhydride in presence of catalytic amount of fly-ash: H2SO4 catalyst. The yield of these N-acetyl pyrazole derivatives are more than 75 %. The synthesised N-acetyl pyrazoline derivatives were characterized by their physical constants and spectral data. The infrared spectral νC=N and C=O (cm-1) frequencies, NMR chemical shifts (δ, ppm) of Ha, Hb, Hc, CH3 protons, C=N, C=O and CH3 carbons of 1-(3-(3,4-dichlorophenyl)-5-(substitutedphenyl)-4,5-dihydro-1H-pyrazole-1-yl) ethanones have been assigned and correlated with Hammett substituent constants and Swain-Lupton’s parameters using single and multi-regression analysis. From the results of statistical analyses the effect of substituents on the above group frequencies and chemical shifts of the acetylated pyrazoles were discussed.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 14; 44-57
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of mono- and divalent cations on Tetrahymena thermophila telomeric repeat fragment. A photon correlation spectroscopy study.
Autorzy:
Włodarczyk, Agnieszka
Patkowski, Adam
Grzybowski, Przemysław
Dobek, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1041510.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
chromosome ends
G-quadruplex
telomeric DNA
photon correlation spectroscopy
structure transition
Opis:
The structure of the Tetrahymena thermophila telomeric sequence d(TGGGGT)4 was studied by photon correlation spectroscopy (PCS) in aqueous solution in the presence of NaCl, KCl and SrCl2. The sample studied was polydisperse in all conditions studied. Translational diffusion coefficients DT describing the diffusion modes observed were determined. On the basis of a comparison between the experimental DT values with those calculated assuming the bead model, two forms were identified as telomeric quadruplex structures: monomer and tetramer. In the presence of SrCl2 formation of aggregates was observed, with a size that reached several micrometres. The relative weighted concentrations of the structures observed for different concentrations of a salt and DNA were determined. The results obtained in the presence of monovalent ions were qualitatively similar and could be presented in a coherent plot in which the concentration of salt was expressed by the number of ions per DNA molecule. A large number of ions per DNA molecule favoured tetramer formation while a small number favoured the monomer form. A structural phase transition from the monomer to the tetramer induced by a change in the number of ions per DNA molecule was observed. The main difference between the results for Na+ and K+ was a greater effectiveness of the K+ ions in formation of tetramers. The effect of Sr2+ ions on the structures formed was different than that of the monovalent ions. The results obtained in the presence of Sr2+ could not be described as a function of the number of ions per DNA molecule.
Źródło:
Acta Biochimica Polonica; 2004, 51, 4; 971-981
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A mechanism reliability analysis method considering environmental influence and failure modes’ correlation : a case study of rifle automaton
Autorzy:
Fang, Yi-chuan
Wang, Yong-juan
Sha, Jin-long
Gu, Tong-guang
Zhang, He
Powiązania:
https://bibliotekanauki.pl/articles/24200826.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
mechanism reliability
environmental influence
failure modes’ correlation
copula function
Kaplan-Meier estimation
rifle automaton
Opis:
In order to overcome the challenge of quantifying the influence of environmental conditions and the coexistence of multiple failure modes involved in mechanism reliability modelling under different environments. In this paper, we propose a method for the analysis of mechanism reliability that takes into account the influence of environmental factors and failure modes’ correlation, quantifies the influence of environmental factors as the random distribution and degradation path of parameters, and derives the Copula description of failure mode correlation from the historical data of environmental experiments. On the basis of the discrete mechanism dynamics model, the output parameters of the characteristic points are calculated, and the failure rate of each failure mode is calculated based on the failure criterion and the performance margin theory. Additionally, the dynamic change pattern of the mechanism reliability is compared with the Kaplan-Meier estimation of the corresponding environmental test history data to assess the validity of the calculation results. The reliability modelling problem of a motion mechanism of an automatic rifle automaton in a high and low temperature environment is applied to the method, and the reliability calculation results are close to those of Kaplan-Meier estimation of the test history data, and all are within the upper and lower bounds given by the reliability boundary theory, demonstrating the method's validity.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 2; art. no. 166145
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study of Correlation between Fishing Activity and AIS Data by Deep Learning
Autorzy:
Shen, K. Y.
Chu, Y. J.
Chang, S. J.
Chang, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/1841621.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
AIS Data
deep learning framework
learning methods
Recurrent Neural Network
(RNN)
Automatic Identification System
(AIS)
fishing operation
Opis:
Previous researches on the prediction of fishing activities mainly rely on the speed over ground (SOG) as the referential attribute to determine whether the vessel is navigating or in fishing operation. Since more and more fishing vessels install Automatic Identification System (AIS) either voluntarily or under regulatory requirement, data collected from AIS in real time provide more attributes than SOG which may be utilized to improve the prediction. To be specific, the ships' trajectory patterns and the changes in course become available and should be considered. This paper aims to improve the accuracy in the identification of fishing activities. First, we do feature extraction from the AIS data of coastal waters around Taiwan and build a Recurrent Neural Network (RNN) model. Then, the activity data of fishing vessels are divided into fishing and non-fishing. Finally, based on the testing by feeding various fishing activity data, we can identify the fishing status automatically.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 3; 527-531
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The study of correlation between forward head posture and neck pain in Iranian office workers
Autorzy:
Nejati, Parisa
Lotfian, Sara
Moezy, Azar
Nejati, Mina
Powiązania:
https://bibliotekanauki.pl/articles/2177383.pdf
Data publikacji:
2015-03-12
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
neck pain
craniovertebral angle
forward head posture
high thoracic angle
office employee
Opis:
Introduction Factors such as prolonged sitting at work or improper posture of head during work may have a great role in neck pain occurrence among office employees, particularly among those who work with computers. Although some studies claim a significant difference in head posture between patients and pain-free participants, in literature the forward head posture (FHP) has not always been associated with neck pain. Since head, cervical and thoracic postures and their relation with neck pain has not been studied in Iranian office employees, the purpose of this study was to investigate the relationship between some work-related and individual factors, such as poor posture, with neck pain in the office employees. Material and methods It was a cross-sectional correlation study carried out to explore the relationship between neck pain and sagittal postures of cervical and thoracic spine among office employees in forward looking position and also in a working position. Forty-six subjects without neck pain and 55 with neck pain were examined using a photographic method. Thoracic and cervical postures were measured using the high thoracic (HT) and craniovertebral (CV) angles, respectively. Results High thoracic and CV angles were positively correlated with the presence of neck pain only in working position (p < 0.05). In forward looking position, there was no statistically significant difference between the 2 groups (p > 0.05). Conclusions Our findings have revealed that office employees had a defective posture while working and that the improper posture was more severe in the office employees who suffered from the neck pain.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2015, 28, 2; 295-303
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphological characterization of biocontrol isolates of Trichoderma to study the correlation between morphological characters and biocontrol efficacy
Autorzy:
Kumar, M.
Sharma, P.
Powiązania:
https://bibliotekanauki.pl/articles/11742.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
The morphological characterization was carried out for 5 isolates of Trichoderma harzianum and 7 isolates of Trichoderma viride and tested for their biocontrol efficacy. The isolates belonging to T.harzianum were analogous in colony colour, culture smell, mycelial colour, conidiation, conidial shape, conidial wall and conidial colour. Correspondingly the isolates of T.viride showed certain similarity in colony colour, colony edge, culture smell, conidiophore branching, conidial wall, conidial colour and chlamydospores. Inter specific differences through cluster analysis based on morphological characters grouped the twelve isolates into three major clusters where all the isolates of T.harzianum formed a single cluster while the isolates of T.viride were bifurcated into two groups. The clustering was substantiated by similarity index which showed maximum similarity among T.harzianum isolates with only less than 20% variation among themselves. Similarly the clusters having isolates of T.viride also had less variation within them. The biocontrol efficacy of these twelve isolates of Trichoderma was experimented by dual culture test under laboratory condition and there existed some relation between the biocontrol efficacy of these isolates and morphology.
Źródło:
International Letters of Natural Sciences; 2016, 55
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of digital image correlation in the study of Achilles tendon strain field
Zastosowanie cyfrowej korelacji obrazów w badaniach pola odkształceń ścięgna Achillesa
Autorzy:
Holak, K.
Kohut, P.
Młyniec, A.
Ekiert, M.
Tomaszewski, K.
Uhl, T.
Powiązania:
https://bibliotekanauki.pl/articles/369079.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
vision systems
digital image correlation
biomechanical measurements
human Achilles tendon
systemy wizyjne
cyfrowa korelacja obrazów
pomiary biomechaniczne
ludzkie ścięgno Achillesa
Opis:
This paper presents an application of a vision-based measurement method in the experimental mechanics of biological materials. The displacement and strain fields of a human Achilles tendon specimen under a tensile test were computed using the digital image correlation method. Different software applications, both commercial and open source, were compared. The performance of algorithms was tested based on a referential measurement earned out by commercial software with the affine model of deformation implemented. The root mean square error of the difference between strain obtained using the reference measurement and each of the analyzed programs was computed. Additionally, an example of a full-field computation of displacement and strain field was presented.
Artykuł przedstawia zastosowanie pomiarów wizyjnych w mechanice eksperymentalnej badającej właściwości materiałów biologicznych. Pole przemieszczeń i odkształceń ludzkiego ścięgna Achillesa uzyskane podczas statycznej próby rozciągania zostało wyznaczone za pomocą algorytmu cyfrowej korelacji obrazów. Porównano kilka wybranych programów komputerowych, zarówno komercyjnych, jak i darmowych, realizujących pomiar za pomocą metody korelacji Skuteczność algorytmów była testowana na podstawie wyników referencyjnych, otrzymanych z komercyjnego programu, w którym została zaimplementowana korelacja oparta na deformowalnym modelu afinicznym. Wyznaczono błędy średniokwadratowe różnicy pomiędzy danymi referencyjnymi a danymi otrzymanymi z każdego z testowanych programów. Dodatkowo pokazano przykład uzyskanego pola przemieszczeń i odkształceń na całej powierzchni testowanej próbki.
Źródło:
Mechanics and Control; 2015, 34, 1; 19-26
2083-6759
2300-7079
Pojawia się w:
Mechanics and Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The study of linear correlation between surface roughness parameters and adhesion of flame sprayed coatings
Autorzy:
Mikuliszyn, J.
Starosta, R.
Powiązania:
https://bibliotekanauki.pl/articles/246506.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
flame spraying
adhesion
roughness parameters
Ni-5%Al coating
correlation
Opis:
Adhesion is one of the reasons for limiting the use of thermally sprayed coatings. Many factors influence the adhesion of thermally sprayed coatings, for example: quality of the workmanship of surface preparation, method of thermal spraying, processing parameters, and the temperature of the preliminary preheat substrate, properties of the substrate and coating materials. Another one is the surface roughness. Attempts are made to use surface roughness parameters (e.g. Ra, Rz, Rq, Rku, Rsk) for prediction of adhesion of thermally sprayed coatings. However, most often these attempts end in failure. This article discusses the task of assessing the linear correlation between the twelve parameters of roughness or material ratio of various surface profiles and strength bond of coatings. For analysis, the following parameters were selected: Rz, Ra, Rq, Rsk, Rt, RSm, Rp, Rv, Rku, Rmr (50%), Rk, Rpk, Rvk. The steel substrates (S185) were machined by abrasive machining. The surface roughness of the steel substrate ranged Rz = 1.89-5.34 mm. Nickel-based coatings were applied by flame spraying by the Casto Dyn DS 8000 torch. Adhesion of coatings was measured by pull – off method. The flame sprayed coatings were characterized by adhesion to the steel substrate in the range of from 5.53 MPa to 8.28 MPa. The highest value of the correlation coefficient (Pearson – R)between parameters Rp, Rpk, and adhesion of thermally sprayed coatings were found. The coefficient R was equalto the 0.83, and the coefficient of determination R2 = 0.7. The lowest value of the correlation coefficient was found for the Rku roughness parameter amounting to 0.37. In the measurements carried out, it can be concluded that the prediction of adhesion of the coatings according to the roughness of the substrate, should be carried out by use the parameters characterizing the peaks height of roughness profile.
Źródło:
Journal of KONES; 2016, 23, 1; 223-229
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on the Correlation between Wood Moisture and the Damping Behaviour of the Tonewood Spruce
Autorzy:
Göken, J.
Fayed, S.
Schäfer, H.
Enzenauer, J.
Powiązania:
https://bibliotekanauki.pl/articles/1030781.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
spruce wood
musical instruments
wood moisture
damping measurement
Opis:
In acoustic musical instruments special attention needs to be paid to those particularly sensitive parts made of tonewood whose function is to respond to vibrations. One of the most important tonewoods is spruce because of its good resonance properties. Spruce is especially used for soundboards, these being the primary source of sound. Piano manufacturers dry their soundboards to approximately 6% wood moisture, at which drying stage they are glued into the instrument. Fluctuations of the moisture content in the wood affect the tone. With changing moisture content, the instrument can go out of tune, even cracks can appear at very low moisture content in the wood. In addition, the tone colour will change. This may result from changes in the hammer felt or from changes in the vibration properties of the soundboard. Strain- and frequency-dependent damping measurements were carried out on spruce wood at different wood moisture contents in order to investigate the effect of the moisture content on the vibration behaviour. Wood which is slowly dried in air for several years is preferably used for high-class pianos. Therefore, damping measurements on new and on more than 130-year old spruce wood samples were performed.
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1241-1260
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 73

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