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Wyświetlanie 1-15 z 59
Tytuł:
A robust predictive actuator fault-tolerant control scheme for Takagi-Sugeno fuzzy systems
Autorzy:
Witczak, P.
Witczak, M.
Korbicz, J.
Aubrun, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/199920.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fault diagnosis
fault identification
robust control
robust invariant set
predictive control
fault-tolerant control
diagnostyka błędu
identyfikacja błędów
diagnostyka predykcyjna
kontrola tolerancji błędu
Opis:
The paper deals with the problem of robust predictive fault-tolerant control for nonlinear discrete-time systems described by the Takagi-Sugeno models. The proposed approach is based on a triple stage procedure, i.e. it starts from fault estimation while the fault is compensated with a robust controller. The robust controller is designed without taking into account the input constraints related with the actuator saturation that may change due to its faulty behaviour. Thus, to check the compensation feasibility, the robust invariant set is developed, which takes into account the input constraints. If the current state does not belong to the robust invariant set, then suitable predictive control actions are performed in order to enhance the invariant set. This appealing phenomenon makes it possible to enlarge the domain of attraction, which makes the proposed approach an efficient solution for the fault-tolerant control. The final part of the paper shows an illustrative example regarding the application of the proposed approach to the twin-rotor system.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 4; 977-987
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study On The Fabrication Of Iron Powder From Forging Scale Using Hydrogen
Próby wytwarzanie proszku żelaza metodą redukcji zgorzeliny pochodzącej z procesów kucia za pomocą wodoru
Autorzy:
Shin, S. M.
Lee, D.-W.
Yun, J.-Y.
Kang, Ch.-Y.
Wang, J.-P.
Powiązania:
https://bibliotekanauki.pl/articles/350946.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
forging scale
hydrogen partial pressure
hematite
iron powder
kucie za pomocą wodoru
hematyt
redukcja zgorzeliny
proszek żelaza
Opis:
This study was conducted to investigate the effect of hydrogen content, temperature, reaction time for the reduction of forging scale which is mainly composed of hematite (Fe2O3). All reductive reactions were performed over the temperature range of 700 to 1200°C as well as 0.1 to 1 atm of hydrogen partial pressures. The results showed that the mechanism for the reduction of iron oxides using hydrogen gas was not a simple process, but proceeded in multiple reduction stages thermodynamically. The iron oxide was almost completely reduced to metallic iron powder with 91 wt.% of iron content in the forging scale at 0.1 atm of hydrogen partial pressure. The content of iron was however found to be increased with increasing hydrogen partial pressure from 0.1 to 1 atm with regardless of temperatures. The metallic iron powder was obtained with the mean size of 100 μm and more porous structure was observed.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1547-1549
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustical studies of binary liquid mixtures of p-chlorotoluene in benzene at different temperatures
Autorzy:
Kumar, G. P.
Babu, Ch. P.
Samatha, K
Jyosthna, A. N.
Showrilu, K.
Powiązania:
https://bibliotekanauki.pl/articles/412275.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ultrasonic velocity
thermodynamic parameters
p-chlorotoluene
molecular interactions
Opis:
Ultrasonic velocities (U), densities (ρ), and coefficient of viscosities (η) are measured for binary mixtures containing (i) p-chlorotoluene and (ii) benzene at 303.15 K, 308.15 K, 313.15 K and 318.15 K to understand the molecular interaction. Various acoustical parameters such as adiabatic compressibility (βad), free length (Lf), acoustic impedance (Z), free volume (Vf), molar volume (Vm), Rao’s constant (R), Wada’s constant (W) and internal pressure (πi), are calculated from the measured values of U, ρ, and η. The trend in acoustical parameters also substantiates to asses strong molecular interactions.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 10; 25-37
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AIDS and nutrition in patients
Autorzy:
Kourkouta, L.
Monios, A.
Iliadis, Ch.
Ouzounakis, P.
Powiązania:
https://bibliotekanauki.pl/articles/1918438.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
AIDS
nutrition
immune system infection
immunosuppressant
Opis:
Introduction: AIDS is a viral infection that particularly affects the nutritional status of patients by complicating the absorption of nutrients and their metabolism. Purpose: The purpose of this retrospective study is to highlight the contribution of nutrition to the wellness of people with HIV in all stages of the disease. Review Methods: The methodology used to select the information used in this study includes review studies and research in leading databases such as PUBMED, MEDLINE, and IATROTEK. The selection criterion of the articles was the Greek and English language.Results: The real goal of the nutritional assessment of patients with AIDS is to improve their ability to consume a sufficient quantity and variety of foods in order to meet their nutritional needs. The evaluation of dietary intake assesses the adequacy of food and nutrients consumed. It includes assessing the dietary patterns, frequency of meals, and the factors that affect food choice. Conclusions: Maintaining a good nutritional status has a significant impact on the functioning of the immune system and the overall health of people living with HIV / AIDS.
Źródło:
Progress in Health Sciences; 2017, 7(1); 182-186
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An assessment of cleaning mechanisms driven by power ultrasound using electrochemistry and highspeed imaging techniques
Autorzy:
Offin, D.
Vian, Ch.
Birkin, P.
Leighton, T.
Powiązania:
https://bibliotekanauki.pl/articles/331598.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
electrochemistry
cleaning mechanisms
high-speed imaging techniques
Opis:
The cleaning of a surface is monitored in real time using a number of physical measurements. In particular an electrochemically inactive material is removed from an electrode while the electrode is able to detect a redox system in the bulk liquid. The removal of the material from the surface is monitored as an increased Faradaic current at the electrode surface. This signal is used to assess the ability of the cleaning method employed, in this case the application of power ultrasound to the system, as a function of the position of the electrode with respect to the sound source. It is shown that, depending on the conditions employed, surface cleaning is driven by different mechanisms. In order to validate these findings highspeed imaging of the system was undertaken and the results correlated with the electrochemical data. In addition a number of novel electrodes were also employed to assess the cleaning efficiency as a function of the electrode geometry employed. Implications for surface cleaning in the presence of power ultrasound are suggested.
Źródło:
Hydroacoustics; 2008, 11; 299-312
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An extended dynamic thermal model of a permanent magnet excited synchronous motor
Autorzy:
Mbo'o, Ch. P.
Hameyer, K.
Powiązania:
https://bibliotekanauki.pl/articles/140883.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal modeling
thermal network
finite element method
iron losses
permanent magnet excited synchronous machine (PMSM)
Opis:
The purpose of this paper is to develop a dynamic thermal model of a permanent magnet excited synchronous motor (PMSM). The model estimates the temperature at specific points of the machine during operation. The model is implemented using thermal network theory, whose parameters are determined by means of analytical approaches. Usually thermal models are initialized and referenced to room temperature. However, this can lead to incorrect results, if the simulations are performed when the electrical machine operates under “warm” conditions. An approach is developed and discussed in this paper, which captures the model in critical states of the machine. The model gives feedback by online measured quantities to estimate the initial temperature. The paper provides an extended dynamic thermal model, which leads to a more accurate and more efficient thermal estimation.
Źródło:
Archives of Electrical Engineering; 2013, 62, 3; 375-386
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous Dielectric Spectra of Ferro- and Ferrielectric Liquid Crystalline Phase in MHPNBC
Autorzy:
Dubois, F.
Douali, R.
Wawrzyniak, A.
Legrand, Ch.
Ropa, P.
Wróbel, S.
Dąbrowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1399013.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Gm
77.84.Nh
64.70.M
Opis:
MHPOBC analogue with long achiral alkyl chain has been investigated by dielectric spectroscopy studies in the wide temperature range. Low frequency dielectric spectroscopy revealed the existence of normal ferroelectric phase (in a narrow gap), two ferri- and three antiferroelectric phases in addition to paraelectric phase and alpha sub-phase. The compound studied shows exceptionally strong dependence of the dielectric permittivities on measuring electric field in the temperature range of ferro- and ferrielectric phases.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 937-939
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anorexia nervosa: A literature review
Autorzy:
Iliadis, Ch.
Frantzana, A.
Ouzounakis, P.
Kourkouta, L.
Powiązania:
https://bibliotekanauki.pl/articles/1918943.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Anorexia nervosa
health problems and treatment.
Opis:
Introduction: Anorexia nervosa is a food intake disorder characterized by acute weight loss that it could cause severe psychosomatic problems. Purpose: To present the data and information as well as the treatment related to Anorexia nervosa. Materials and methods: The study material consisted of reviewed articles on the topic found in Greek and globally accepted electronic databases, Pubmed, Scopus, Medline, Google Scholar, regarding the effects of Anorexia nervosa on health and its treatment. Results: Initial symptoms of Anorexia nervosa and Bulimia Nervosa may be characterised by body-related negative interpretation bias, distorted body image and pronounced body dissatisfaction. Anorexic patients refuse to eat with their family or in public places. They lose weight by drastically reducing their total food intake, with a disproportionate reduction in the amount of meals containing carbohydrates and fats. The term Anorexia is unfortunate, because a decrease in appetite does not occur. Patients are constantly hungry and they are constantly thinking about food, but they refuse it. An indication of their way of thinking is that they often collect recipes or prepare complex meals for others. Conclusions: Anorexia nervosa is a disease that connects the physical with the mental dimension of health. A person's disharmonious relationship with oneself, which may have its roots in a dysfunctional family context or in a demanding and competitive social environment, finds the way to be manifested through the individual's reflection on food.
Źródło:
Progress in Health Sciences; 2020, 10(2); 74-79
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Association between perceived social support and occupational burnout in Greek nurses: A preliminary study
Autorzy:
Chastali-Sitara, M.
Alikari, V.
Platis, CH.
Tsironi, M.
Zyga, S.
Theofilou, P.
Powiązania:
https://bibliotekanauki.pl/articles/1918944.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Perceived social support
burnout
nurses
emotional exhaustion
depersonalization
personal accomplishment
Opis:
Purpose: To examine the relationship between perceived social support and burnout among nurses. Materials and methods: The participants of this study were 42 Greek nurses of a general hospital which were randomly selected. Data was collected using the Greek version of Maslach’s Burnout Inventory for burnout assessment and the Greek version of ‘The Multidimensional Scale of Perceived Social Support’ for the assessment of participants’ levels of perceived social support. A self-administered questionnaire with questions about socio-demographic and work-related characteristics was used. Descriptive statistics and Spearman’s rho correlation coefficient analysis were conducted. Results: The results showed a negative association between emotional exhaustion, depersonalization and perceived social support, especially from friends. Social support from significant others found to have the highest impact while family support found to have the least impact in nurses’ social support. Conclusions: Findings could be applied to the assessment of burnout in Greek nurses and to future prevention of burnout through the enhancement of perceived social support.
Źródło:
Progress in Health Sciences; 2020, 10(2); 22-28
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
At the Tip of an MeV Beam: Provoking Cells and Performing Tomographic Imaging
Autorzy:
Pallon, J.
Arteaga-Marrero, N.
Nilsson, Ch.
Elfman, M.
Kristiansson, P.
Nilsson, C.
Wegdén, M.
Olsson, M.
Åkerström, B.
Powiązania:
https://bibliotekanauki.pl/articles/1808531.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.79.-v
29.40.Wk
87.53.-j
87.53.Ay
25.40.Cm
29.30.Ep
29.30.Kv
61.43.Gt
Opis:
Biological applications of ion beams have recently become a new important research field using single ion hit facilities to study individual living cells and their response to the hit of a counted number of ions. One motivation is the search for a better understanding of the fundamental processes taking place in cells and organs as a result of irradiation. Another comes from the increasing interest in using high energy protons and heavy ions as a modality for radiotherapy of deep seated tumours. In the view of treatment efficiency, study of cell culture behaviour under controlled radiation experiments, and in different chemical environments at single ion hit facilities, is a first step towards a better understanding of the processes. Tomographic techniques are applicable to situations where you need information of the inside of an object but do not want to section it into thin slices or cannot do it. Using focused MeV ion beams for tomography restricts the sample size to the order of 10-100 μm, depending of the initial energy. On the other hand, the ability to focus at a sub-micrometer level makes ion beams well suited for analyses of small sized objects as cells, spores, etc. The scanning transmission ion microscopy mode of tomography gives the mass density and corresponding morphological structure of holes and pores. It can then be used to correct the results from the other mode, particle induced X-ray emission tomography. Here is discussed a porosity analysis of bentonite clay that is planned to form an important buffer zone around canisters filled with spent nuclear reactor fuel waste deposited 500 m underground in Sweden.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 501-506
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania okresu gwarancyjnego dla systemu wieloskładnikowego, w którym zachodzą interakcje uszkodzeniowe
Research on warranty interval of multi-component system with failure interaction
Autorzy:
Cheng, Z. H.
Bai, Y. S.
Cai, L. Y.
Wang, L. Ch.
Li, P. J.
Chen, L.
Powiązania:
https://bibliotekanauki.pl/articles/301278.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
okres gwarancyjny
koszty
dostępność
interakcje uszkodzeniowe
wieloelementowy
warranty period
cost
availability
failure interaction
multi-component
Opis:
W oparciu o analizę interakcji uszkodzeniowych, przyjęto dla systemu wieloskładnikowego politykę gwarancyjną obejmującą niepełną odnowę profilaktyczną. Zbadano średnią intensywność uszkodzeń dla każdego okresu gwarancyjnego oraz skonstruowano modele kosztów obsługi gwarancyjnej oraz dostępności biorąc pod uwagę intensywność uszkodzeń interakcyjnych. Jako przykład podano projekt okresu gwarancyjnego, który może potwierdzić poprawność przyjętego modelu oraz przedstawiono zalety takiego projektu. W badaniach opracowano technikę i metody ustalania okresu gwarancyjnego dla systemów wieloskładnikowych, które stanowią istotny wkład do teorii gwarancji.
Based on the analysis of failure interaction, imperfect preventive warranty policy is adopted for the multi-component system. Average failure rate of each warranty interval is studied and warranty cost model and availability model are built as viewed from interactive failure rate. Then Warranty period project is brought forward as an example, which can validate the feasibility of model and show the advantage of the project. The research can provide technique and methods for determining Warranty Period of multi-component system, which further enriches and perfects the warranty theory.
Źródło:
Eksploatacja i Niezawodność; 2011, 4; 49-55
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Burnout syndrome impacts on quality of life in nursing professionals: The contribution of perceived social support
Autorzy:
Fradelos, E.
Mpelegrinos, S.
Mparo, Ch.
Vassilopoulou, Ch.
Argyrou, P.
Tsironi, M.
Zyga, S.
Theofilou, P.
Powiązania:
https://bibliotekanauki.pl/articles/1916393.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
burnout
quality of life
social support
nursing staff
Opis:
Purpose: To examine the impacts of burnout that has in health-related quality of life (QOL) in nursing staff in Greece. The association of social support with burnout and QOL is also investigated. Materials and methods: Individuals working in Mental and General Hospitals in the broader area of Athens participated in this study (N.139). The measurement tools include a) the Maslach Burnout Inventory (MBI), b) the SF-36 Health Survey and c. the Multidimensional Scale of Perceived Social Support. Burnout and QOL are expected to be related to the evaluation of social environment. Results: The results indicated the impacts that burnout has on quality of life and the positive effect of social support for nursing professionals in the levels of burnout. Conclusions: There is an association between burnout, quality of life and social support. Social support and socio-demographic factors appear to affect the levels of burnout to Psychiatric and General Hospital.
Źródło:
Progress in Health Sciences; 2014, 4, 1; 102-109
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of natural mycobiota in maize grains by ultraviolet (UVC) irradiation
Zwalczanie naturalnych mikobiot w ziarnie kukurydzy za pomocą promieniowania ultrafioletowego (UVC)
Autorzy:
Paez, C.L.R.
Reyes, M.C.P.
Aguilar, C.H.
Pacheco, F.A.D.
Martinez, E.M.
Orea, A.C.
Bonilla, J.L.L.
Powiązania:
https://bibliotekanauki.pl/articles/36667.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
natural mycobiota
mycobiota
fungi
control
maize grain
Zea mays
ultraviolet irradiation
Opis:
The effect of UV-C light as a means of control of natural mycobiota of grains of maize (Zea mays L.) hybrids “San Juan” and ”H-159” (productive cycle, 2009) was investigated. UV-C lamps of 15 W were used and the exposure times applied were 0, 5, 10, 15, 20, 25 and 30 min. The experiment was established in the randomised complete block design with eight and four replicates. The unit pilot was 50 grains. For the determination of mycobiota the agar plate test was used, after disinfection of the grains with sodium hypochlorite diluted to 3% for 1 min. Differences (P ≤ 0.001, P ≤ 0.05) between treatments were found, the best treatments being those of 30 and 10 min, observing reductions of 42.85 and 52.05% in the number of grains infected with Fusarium spp. with respect to control for “San Juan” and “H-159”, respectively. For Fusarium monoliforme it was found that in 30 min there was a reduction of 53.74% for the hybrid “San Juan”, while for H-159 a reduction of 61.7% in 10 minutes was observed. These results show that UV-C radiation may be useful for application as a germicide in future experiments on a wide variety of grains.
Badano wykorzystanie promieniowania UV-C jako metody zwalczania naturalnych mikobiot ziarna hybryd kukurydzy (Zea mays L.) “San Juan” i ”H-159” (cykl produkcyjny, 2009). Zastosowano lampy UV-C o mocy 15 W, a czasy ekspozycji wynosiły 0, 5, 10, 15, 20, 25 oraz 30 min. Doświadczenie założono metodą kompletnych bloków randomizowanych w ośmiu i czterech powtórzeniach. Jednostka pilotażowa wynosiła 50 ziaren. Dla określenia mikobiot zastosowano test agarowy po uprzedniej dezynfekcji ziarna 3% roztworem podchlorynu sodu przez 1 min. Stwierdzono różnice (P ≤ 0,001, P ≤ 0,05) pomiędzy obiektami doświadczenia. Najlepsze wyniki uzyskano dla czasów ekspozycji 30 i 10 min, uzyskując odpowiednio 42,85 oraz 52,05% redukcję ilości ziaren zakażonych Fusarium spp. dla ziarna hybryd “San Juan” i “H-159” w odniesieniu do kontroli. W odniesieniu do Fusarium monoliforme stwierdzono, że po czasie naświetlania 30 min nastąpiła redukcja o 53,74% dla hybrydy “San Juan”, a dla H-159 stwierdzono spadek o 61,7% po 10 minutach. Te wyniki wykazują, że promieniowanie UV-C może być użyteczne do stosowania jako zabieg zarodnikobójczy w przyszłych doświadczeniach na rożnych rodzajach ziarna.
Źródło:
Acta Agrophysica; 2011, 18, 2[193]
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controllable preparation of highly active horseradish peroxidase-gold nanoparticle bionanoconjugate
Autorzy:
Zhang, P.
Liu, Ch.
Song, S.
Peng, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/778931.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
horseradish peroxidase
gold nanoparticles
bionanoconjugate
Opis:
A novel method of immobilizing horse radish peroxidase enzyme (HRP) onto the surface of gold nanoparticles (GNPs) was developed. As a result, a high-activity bionanoconjugates was obtained through utilizing the biotin-streptavidin (SA) system. The HRP-SA-GNP bionanoconjugate with high activity was conveniently prepared through the biotin- avidin system. Compared with the HRP-GNP bioconjugate prepared through the traditional electrostatic absorption method, the enzyme activity per GNPs of this new bionanoconjugate was enhanced by 10 times. Moreover, the enzyme activity of this bionanoconjugate was controllable. The above method of bionanoconjugation preparation has promising applications In the fi elds including preparing highly active bio-nanoprobe and immobilized enzyme.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 4; 57-60
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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