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Tytuł:
Burn-in procedures in accelerated environment and system maintenance policies
Autorzy:
Cha, J. H.
Powiązania:
https://bibliotekanauki.pl/articles/2069586.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
accelerated burn-in
bathtub-shaped failure rate function
optimal burn-in
replacement policy
Opis:
Burn-in is a widely used engineering method which is adopted to eliminate defective items before they are shipped to customers or put into field operation. In order to shorten the burn-in process, burn-in is most often accomplished in an accelerated environment. However, there have been few probabilistic or stochastic models for the burn-in procedures in accelerated environment. In this paper, under a new stochastic model for accelerated burn-in procedure, the problems of determining both optimal accelerated burn-in time and optimal replacement policy are considered. Components are burned-in under an accelerated environment, then those surviving the burn-in procedure are put into field operation and they are maintained under a replacement policy. The properties of the optimal accelerated burn-in time and optimal replacement policy are obtained and a numerical example which illustrates the usage of obtained results will be presented.
Źródło:
Journal of Polish Safety and Reliability Association; 2008, 1; 101--107
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Change of Traditional Method of Treatment of Partial Thickness Burn with Hydrofibre Dressings
Autorzy:
Mitura, Kryspin
Osłowska, Jolanta
Mitura, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/1395548.pdf
Data publikacji:
2015-02-01
Wydawca:
Index Copernicus International
Tematy:
skin burn wound
partial thickness burn
hydrofiber dressing
silver ions
Opis:
Nearly 1% of population is affected with burn trauma annually. Among patients seeking advanced medical care almost 8% require hospital stay. Most burns are superficial and do not cause full thickness damage to the skin. Standard topical treatment of burn wounds with creams and ointments requires frequent dressings’ changes. The healing process is long and expensive. The technological revolution, as occurred in the last decade in the field of dressing care allows us to introduce the use of advanced material solutions. Modern materials allow to shorten the treatment time, reduce the expenses and diminish the patient discomfort leading to good outcome. The study presented a case of four patients treated due to the partial thickness burn wound. Hydrofiber dressing with silver ions were introduced in the treatment. We observed good short and long term results
Źródło:
Polish Journal of Surgery; 2015, 87, 2; 91-96
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Risk of Burn Out at Workers in the Field of Social Services and Health Care
Autorzy:
Budayová, Zuzana
Ludvigh Cintulová, Lucia
Mrosková, Lenka
Powiązania:
https://bibliotekanauki.pl/articles/18668779.pdf
Data publikacji:
2023-06-20
Wydawca:
Fundacja Pro Scientia Publica
Tematy:
Burn out
signs of burn out
Social work
health care
Opis:
Aim. The aim of the research was to analyse the burnout rate of these social workers and nurses, as well as to determine the relationship between burnout syndrome and other important factors, including lifestyle, stress, resistance to stress and other selected demographic indicators. Methods. The Maslach Burnout Inventory was used to collect burnout data in 2021 during the second wave of the Covid-19 pandemic. The research sample consisted of 623 women aged 35-55 who work in social services facilities for the elderly and nurses working in the geriatrics department at a hospital in the western part of Slovakia. Results. Research has shown that lifestyle has a significant impact on the development of burnout syndrome in connection with the quality of work and personal relationships, which can help eliminate feelings of frustration, exhaustion and personal failure in the workplace. Burnout affects social workers regardless of age and education, but with older age and length of practice in the same facility, the risk of manifestations of burnout increases. Significant differences in burnout rates between social workers and nurses in the individual dimensions of exhaustion, depersonalisation and professional attitudes were confirmed. High levels of exhaustion have even shown an increased risk of alcohol consumption among these workers. Conclusion. The development of chronic stress in health care workers can put them at risk of burnout, which is characterized by emotional exhaustion (EE), depersonalization (DP) in interactions with patients and social clients, and low levels of personal accomplishment (PA) in social work and health care.
Źródło:
Journal of Education Culture and Society; 2023, 14, 1; 365-380
2081-1640
Pojawia się w:
Journal of Education Culture and Society
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wypalenie zawodowe – przyczyny, objawy, skutki, zapobieganie
Job burn-out - causes, symptoms, effects, prevention
Autorzy:
Ostrowska, M.
Michcik, A
Powiązania:
https://bibliotekanauki.pl/articles/179093.pdf
Data publikacji:
2013
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
zespół wypalenia zawodowego
objawy
przyczyny
zapobieganie
job burn-out
symptoms
causes
prevention
Opis:
W ostatnich latach wypalenie zawodowe jest coraz powszechniejszym zjawiskiem. Celem artykułu jest przedstawienie Czytelnikowi jego genezy i definicji oraz najczęstszych przyczyn i objawów. W pracy zaprezentowano fazy wypalenia zawodowego według American Psychology Association oraz Freudenbergera i Northa. W artykule zwrócono uwagę na konsekwencje tego syndromu zarówno dla jednostki na nie cierpiącej, jak i organizacji. Przedstawiono też sposoby przeciwdziałania tej chorobie zawodowej oraz podjęto próbę analizy wybranych badań dostępnych w literaturze.
In recent years, burn –out has become an increasingly common phenomenon This article provides the reader with the origins, definitions and the most common causes and symptoms of burn-out It presents phases burn-out according to the American Psychology Association, and Freundenberger and North. This article draws attention to the consequences of this syndrome, both for the individual suffering from it and the organization it also discusses ways of preventing this occupational disease and analysis of selected studies.
Źródło:
Bezpieczeństwo Pracy : nauka i praktyka; 2013, 8; 22-25
0137-7043
Pojawia się w:
Bezpieczeństwo Pracy : nauka i praktyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antibacterial activity of modified zinc oxide nanoparticles against Pseudomonas aeruginosa isolates of burn infections
Autorzy:
Aysa, Noor Hadi
Salman, Halah Dawood
Powiązania:
https://bibliotekanauki.pl/articles/1191368.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antimicrobial activity
Pseudomonas aeruginosa
ZnO
burn infection
nanoparticles
surface modification
Opis:
In this research antimicrobial activity of nanoparticles ZnO on perilous bacteria such as Pseudomonas aeruginosa was evaluated. P. aeruginosa is important pathogen that caused burn wound infections as it is multi-drug resistant and has several virulence factors. Fifteen samples of P. aeruginosa were collected from patients who suffering from Burn infections in Al-Hilla teaching hospital burn unit with the age range between (7-80) years old for both genders. After collecting burn samples, the diagnosis and characterization were performed by culturing and biochemical tests. ZnO NPs were synthesized by chemical method, Zinc oxide nanoparticles are well-known to be one of the multifunctional inorganic compounds which are widely used in medical applications. This study aims to prepare ZnO nanoparticles with particle size ranging from 23-29  nm. In the present study, surface modification of ZnO nanoparticles was performed, and influence of modification of the structure and morphological properties was investigated. The resulting nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force (AFM). Zinc oxide nanoparticles with the average diameter of about 29 nm were modified with an oleic acid to exert more compatibility. From the results obtained it is suggested that modified ZnO-nanoparticles could be used effectively in safety environmental and medical applications. Antibacterial activity for nanoparticle ZnO against P. aeruginosa isolates was measured by: Agar Diffusion Technique and Minimum Inhibitory Concentration (MIC)/Minimum bactericidal Concentration (MBC) with microdilution. The best zone of inhibition was (35.5mm) at a concentration of 40 μg/ml of nano-ZnO in one strain of P. aeruginosa while the lowest inhibition zone was (16 mm) at a concentration of 20 μg/ml of nano ZnO in one strain also. In addition, all P. aeruginosa isolates were completely inhibited at the concentration of 3.7 μg/ml of nano-ZnO (MIC) but no significant antibacterial activity was observed at concentrations less than 1.8 μg/ml of nano-ZnO and the (MBC) was same as MIC (3.7 μg/ml) for all P.aeruginosa isolates.
Źródło:
World Scientific News; 2016, 33; 1-14
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania temperaturowe modułów elektronicznych
Temperature testing of electronic modules
Autorzy:
Ćwirko, J.
Ćwirko, R.
Powiązania:
https://bibliotekanauki.pl/articles/209036.pdf
Data publikacji:
2008
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
diagnostyka temperaturowa
bezkontaktowy pomiar temperatury
temperaturowy system skaningowy
test burn-in
temperature diagnostics
non-contact temperature measurement
temperature mapping system
burn test
Opis:
W artykule przedstawiono system pomiarowy do wyznaczania rozkładu temperatury modułów elektronicznych. Czujnik pirometryczny umożliwia wykonanie bezkontaktowych pomiarów temperatury. Przedstawiony system umożliwia badania dwu- lub trójwymiarowych rozkładów wartości temperatury płyt głównych komputerów PC lub central alarmowych. W drugiej części artykułu przedstawiono zrealizowane stanowisko pomiarowe do wykonywania badań środowiskowych typu burn-in.
In this paper, the temperature mapping system for electronic devices is presented. The pyroelectronic temperature sensor enables non-contact measurements. The measured system provides two or three dimensions temperature scan of electronic modules as PC motherboards or security system motherboards. In the second part of this paper, the measurement system for thermal environment test on security system modules is presented.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2008, 57, 2; 133-142
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Burn disease - the possibility of limiting its effects in the prehospital phase
Choroba oparzeniowa - możliwości ograniczenia jej skutków w fazie przedszpitalnej
Autorzy:
Zdanowski, Rafał
Radziszewski, Jakub
Gorgone, Chiara
Powiązania:
https://bibliotekanauki.pl/articles/1033102.pdf
Data publikacji:
2019
Wydawca:
Towarzystwo Pomocy Doraźnej
Tematy:
burn disease
burns
first aid.
injuries
medical emergency
Opis:
Burns represent a significant percentage of injuries amongst trauma patients. The risks from a burn wound depends on the causative factor, time and place of exposure, extent and severity of the burn. Classification according to the American Burn Association indicates that severe burns should be diagnosed from as low as 10% of Third-degree total body surface burn. The burn disease develops progressively through shock, catabolic and anabolic phases until the development of Multiple Organ Dysfunction Syndrome (MODS). Actions performed in the pre-hospital phase are crucial for the effectiveness of the therapeutic process. Wrongful first aid performed by a witnesses of the event may worsen the patient's condition and lead to secondary infection. Studies available in the literature indicate the use of egg whites, yoghurts and ice as means of first aid. Educational projects to promote good practice, using products such as hydrogel dressings, seem therefore necessary. Medical personnel should quickly assess the extent and severity of burns. Furthermore, one ought to implement volume-calculated fluid therapy, protect the respiratory tract and strive to ensure thermal comfort. It seems mandatory to assess the extent of pain and administer appropriate pharmacological measures to perform analgosedation. Due to the limited number of specialist burn treatment centres, paramedics should consider indications for hospitalization and the use of Medical Air Rescue (MAR) enabling rapid patient allocation.
Oparzenia stanowią znaczny odsetek wśród pacjentów urazowych. Zagrożenia wynikające z powstania rany oparzeniowej zależą od czynnika powodującego, czasu i miejsca ekspozycji, rozległości oraz stopnia oparzenia. Klasyfikacja według American Burn Association wskazuje, że oparzenia ciężkie należy rozpoznać już od 10% powierzchni ciała oparzonej w stopniu III. Choroba oparzeniowa rozwija się stopniowo przechodząc przez fazę wstrząsową, kataboliczną, anaboliczną, aż do rozwinięcia się pełnoobjawowego zespołu niewydolności wielonarządowej (MODS – Multiple Organ Dysfunction Syndrome). Dla skuteczności procesu terapeutycznego kluczowe są działania wykonane w fazie przedszpitalnej. Błędnie udzielona pierwsza pomoc przez świadków zdarzenia może pogorszyć stan pacjenta i prowadzić do wtórnego zakażenia. Badania dostępne w literaturze wskazują na wykorzystywanie w ramach pierwszej pomocy białek jaj kurzych, jogurtów i lodu. Dlatego konieczne wydają się projekty edukacyjne promujące prawidłowe zasady postępowania, z wykorzystaniem takich produktów jak opatrunki hydrożelowe. Personel medyczny powinien dokonać szybkiej oceny rozległości i stopnia oparzeń. Należy wdrożyć odpowiednio wyliczoną objętościowo płynoterapię, zabezpieczyć drogi oddechowe i dążyć do zachowania komfortu termicznego. Obowiązkowa wydaje się ocena skali bólu oraz podanie właściwych środków farmakologicznych w celu wykonania analgosedacji. Z uwagi na ograniczoną liczbę specjalistycznych ośrodków leczenia oparzeń ratownicy medyczni powinni rozważyć wskazania do hospitalizacji, a także wykorzystanie Medical Air Rescue (MAR) umożliwiającego szybką alokację pacjenta.
Źródło:
Critical Care Innovations; 2019, 2, 4; 25-35
2545-2533
Pojawia się w:
Critical Care Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wiebe function parameter determination for mass fraction burn calculation in an ETHANOL-GASOLINE fuelled SI engine
Autorzy:
Yeliana, Yeliana
Cooney, C.
Worm, J.
Michalek, D.
Naber, J.
Powiązania:
https://bibliotekanauki.pl/articles/949481.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ethanol-gasoline blend
mass fraction burn
IC engine
Wiebe function
Opis:
The Mass Fraction Burn (MFB) and Heat Release Rate (HRR) reflect the amount of fuel burned and the rate of burning throughout the combustion process in an internal combustion engine. These parameters play a crucial role in research and development endeavours focused on engine efficiency, emissions, and overall operating performance. Analytically in a Spark-Ignition (SI) engine, these parameters are often modelled with the Wiebe function, a well known mass fraction burn formulation, which is a function of "a" (efficiency parameter), "m" (form factor), crank angle, and the duration of combustion. This function is a simple but powerful correlation model that is well suited for zero and one dimensional engine cycle simulations. In this work, the Wiebe function parameters are determined over a range of fuel compositions and compression ratios by fitting the Wiebe function curve to the experimentally obtained MFB data from a single-zone HRR analysis. The Wiebe function parameters are determined using a curve fitting model by finding the minimum of a scalar function of several variables. This functionality has been built into the single-zone mass fraction burned model. Experiments with five ethanol-gasoline fuel blends: E0 (gasoline), E20, E40, E60, and E84 were conducted on a SI Cooperative Fuels Research (CFR) engine while holding a constant load of 330 kPa Net Indicated Mean Effective Pressure (Net IMEP). There were five methods introduced to fit the Wiebe function parameters, which utilized a combination of least square method and direct algebraic solution. This paper details the process used to determine the Wiebe function parameters, and compare the results obtained using these methods for the ethanol-gasoline mixture concentrations.
Źródło:
Journal of KONES; 2008, 15, 3; 567-574
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of the Types of Microorganisms Isolated from Blood and Wounds on the Results of Treatment in Burn Patients with Sepsis
Autorzy:
Glik, Justyna
Kawecki, Marek
Gaździk, Tadeusz
Nowak, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/1396591.pdf
Data publikacji:
2012-01-01
Wydawca:
Index Copernicus International
Tematy:
burns
sepsis
burn wound infections
blood infection
Opis:
Despite development of combustiology, infections continue to be the most important cause of death among patients with burns. Sepsis is the most severe clinical presentation of infection in patients after thermal injuries who require immediate treatment. Early diagnosis and proper treatment of sepsis are important in the clinical management that is often hampered for multiple reasons, e.g. impaired patient immunity, problems with microorganisms with multi-antibacterial drug resistance.The aim of the study was to assess effect of type of a microorganism isolated from blood and wound on results of treatment of sepsis in patients with burns.Material and methods. Effect of type of microorganisms isolated from blood and wound on the result of treatment of sepsis was studied in 338 patients hospitalized immediately after an injury in Centre for Burn Treatment in Siemianowice Śląskie in years 2003 - 2004 (at the age of 18 - 96 years, 66 women and 272 men). Clinical symptoms of generalized infection were found in all study subjects. The study group was divided into two subgroups: cured patients and patients who died of sepsis. The following parameters were assessed in both subgroups: type of microorganism isolated from blood, type of microorganism isolated from wound as well as occurrence of the same and different infections of blood and burn wound.Results. positive blood cultures were found in 165 patients (48.8%), 106 (64.2%) were cured, 59 (35.8%) died. The most commonly isolated microorganisms in cured patients were Gram(+) Staphylococcus epidermidis MRSE (19.81%) and Staphylococcus aureus MRSA (18.87%). Gram(-) intestinal rods were least commonly isolated from this group. The most commonly isolated microorganisms from blood of patients who were to die, included non-fermenting Gram(-) rods Acinetobacter baumannii (35.59%) and Pseudomonas aeruginosa (22.03%). Mixed bacterial flora was found in the blood of 22.03% patients. Among patients who were to die, the same microorganisms were found in the blood and in the wound in 32.2% of patients, while this rate was 17.92 in cured patients. The most commonly found bacteria in the blood and burn wound in the cured patients included Staphylococcus aureus MRSA (31.58%) and Staphylococcus aureus (21.05%). In the group of patients who were to die, the most common bacteria isolated simultaneously from the blood and burn wound included Acinetobacter baumannii (47.37%) and Pseudomonas aeruginosa (36.84%).Conclusions. 1. The patients with thermal injuries are at higher risk of death in the event of sepsis caused by Gram(-) bacteria versus Gram(+) bacteria. 2. Infection of blood and burn wound caused by the same bacteria Pseudomonas aeruginosa and Acinetobacter baumanni increases the risk of death due to sepsis in patients with burns following thermal injuries.
Źródło:
Polish Journal of Surgery; 2012, 84, 1; 6-16
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Teachers’ occupational burn out syndrome in secondary school
Autorzy:
Szeliga-Kowalczyk, Anna
Powiązania:
https://bibliotekanauki.pl/articles/685118.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
occupational burnout, teachers, work
Opis:
Due to many reasons, the phenomenon of occupational burnout in educational institutions is ignored. Therefore, it was considered advisable to carry out a research in the scope of the level, frequency and causes of occupational burnout among teachers in secondary school. The research work subjects are teachers of a randomly selected mechanical school complex in Poland. The results of the research presented in this paper lead to the conclusion that the occupational burnout syndrome affects the surveyed teachers. Most of the teachers are aware of the occupational burnout affecting them, however they are unable to unequivocally define its level. Almost 80% of respondents apply no remedies.
Źródło:
Jagiellonian Journal of Management; 2015, 1, 4
2450-114X
Pojawia się w:
Jagiellonian Journal of Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Property determination for ethanol-gasoline blends with application to mass fraction burn analysis in a spark ignition engine
Autorzy:
Yeliana, Yeliana
Worm, J.
Michalek, D.
Naber, J.
Powiązania:
https://bibliotekanauki.pl/articles/950185.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ethanol-gasoline blend
mass fraction burn
heat release
IC engine
fuel-air mixture properties
Opis:
The Mass Fraction Burn (MFB) and Heat Release Rate (HRR) reflects the amount of fuel burned, and the rate of burning throughout the combustion process in an internal combustion engine. These parameters play a crucial role in research and development endeavors focused on engine efficiency, emissions, and overall operating performance. They are computed by analyzing measured pressure data and applying thermodynamic principals to determine the energy released during the combustion process. Thus, the properties of the fuel-air and combusted gas mixtures play an important role in the analysis. Engine pressure data were taken from a Spark-Ignition Cooperative Fuels Research (CFR) engine operating at a constant load of 330 kPa Net Indicated Mean Effective Pressure (Net IMEP) and using five ethanol-gasoline fuel blends: E0 (gasoline), E20, E40, E60, and E84. The fuels were assumed to be in a non-reacting state throughout the mixing process. Once the fuel mixture properties were known, the fuel-air and burned mixture properties were determined using the fuel-air mass ratio. The analysis presented within this paper details the process by which the fuel, fuel-air, and burned mixture properties can be determined. The MFB of five different fuel blends at a chosen operating condition was also presented along with the pressure trace, the temperature and the gamma profile at the end of this paper.
Źródło:
Journal of KONES; 2008, 15, 2; 553-561
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Paradoksy awangardowego zaangażowania. Ideologia (artystycznej) zmiany w powieści „Palę Paryż” Brunona Jasieńskiego
Paradoxes of the Avant-Garde Engagement. The Ideology of (Artistic) Change in Bruno Jasieński’s ”I Burn Paris”
Autorzy:
Boruszkowska, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/578842.pdf
Data publikacji:
2019
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
engagement, avant-garde, Bruno Jasieński, I burn Paris
Opis:
The article contains considerations about the political and ideological engagement of the avantgarde writer that were developing in the inter war period and which have their origins amongst, for example, avant-garde ideas. The paper analyses Bruno Jasieński’s text “Palę Paryż” (I burn Paris) (1931), while the context for the novel is a critical revision of the relationship between politics and literature.
Źródło:
Zagadnienia Rodzajów Literackich; 2019, 62, 2; 49-65
0084-4446
Pojawia się w:
Zagadnienia Rodzajów Literackich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconsideration of thermonuclear possibilities of Z-pinches
Autorzy:
Vikhrev, V. V.
Powiązania:
https://bibliotekanauki.pl/articles/147474.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
fusion burn wave
neutrons
plasma focus
Z-pinch
Opis:
The paper considers the Z-pinch as the basis for future thermonuclear fusion reactors. Experiments on Z-pinches always concern small and high temperature and a high density plasma regions that arise spontaneously in the Z-pinch neck. A burn wave might be initiated in the Z-pinch column if in this small plasma region a Lawson-like condition is fulfilled.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 9-12
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of the effects of changing burn-up and gap gaseous compound on the gap convection coefficient (in a hot fuel pin) in VVER-1000 reactor
Autorzy:
Rahgoshay, M.
Rahmani, Y.
Powiązania:
https://bibliotekanauki.pl/articles/147623.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
VVER-1000
nuclear reactor
burn-up
Ross and Stoute model
gap convection
hot fuel pin
thermal expansion
Opis:
In this article we worked on the result and process of calculation of the gap heat transfer coefficient for a hot fuel pin in accordance with burn-up changes in the VVER-1000 reactor at the Bushehr nuclear power plant (Iran). With regard to the fact that in calculating the fuel gap heat transfer coefficient, various parameters are effective and the need for designing a model is being felt, therefore, in this article we used Ross and Stoute gap model to study impacts of different effective parameters such as thermal expansion and gaseous fission products on the hgap change rate. Over time and with changes in fuel burn-up some gaseous fission products such as xenon, argon and krypton gases are released to the gas mixture in the gap, which originally contained helium. In this study, the composition of gaseous elements in the gap volume during different times of reactor operation was found using ORIGEN code [3]. Considering that the thermal conduction of these gases is lower than that of helium, and by using the Ross and Stoute gap model, we find first that the changes in gaseous compounds in the gap reduce the values of gap thermal conductivity coefficient, but considering thermal expansion (due to burn-up alterations) of fuel and clad resulting in the reduction of gap thickness we find that the gap heat transfer coefficient will augment in a broad range of burn-up changes. These changes result in a higher rate of gap thickness reduction than the low rate of decrease of heat conduction coefficient of the gas in the gap during burn-up. Once these changes have been defined, we can proceed with the analysis of the results of calculations based on the Ross and Stoute model and compare the results obtained with the experimental results for a hot fuel pin as presented in the final safety analysis report of the VVER-1000 reactor at Bushehr [2]. It is noteworthy that the results of accomplished calculations based on the Ross and Stoute model correspond well with the existing experimental results for this reactor.
Źródło:
Nukleonika; 2007, 52, 3; 93-95
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Burn-up calculation of different thorium-based fuel matrixes in a thermal research reactor using MCNPX 2.6 code
Autorzy:
Gholamzadeh, Z.
Feghhi, S. A. H.
Soltani, L.
Rezazadeh, M
Tenreiro, C.
Joharifard, M.
Powiązania:
https://bibliotekanauki.pl/articles/148179.pdf
Data publikacji:
2014
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ThO2
neutronic parameters
fuel burn-up
233U
235U
239Pu fissile material
Opis:
Decrease of the economically accessible uranium resources and the inherent proliferation resistance of thorium fuel motivate its application in nuclear power systems. Estimation of the nuclear reactor’s neutronic parameters during different operational situations is of key importance for the safe operation of nuclear reactors. In the present research, thorium oxide fuel burn-up calculations for a demonstrative model of a heavy water- -cooled reactor have been performed using MCNPX 2.6 code. Neutronic parameters for three different thorium fuel matrices loaded separately in the modelled thermal core have been investigated. 233U, 235U and 239Pu isotopes have been used as fi ssile element in the thorium oxide fuel, separately. Burn-up of three different fuels has been calculated at 1 MW constant power. 135X and 149Sm concentration variations have been studied in the modelled core during 165 days burn-up. Burn-up of thorium oxide enriched with 233U resulted in the least 149Sm and 135Xe productions and net fi ssile production of 233U after 165 days. The negative fuel, coolant and void reactivity of the used fuel assures safe operation of the modelled thermal core containing (233U-Th) O2 matrix. Furthermore, utilisation of thorium breeder fuel demonstrates several advantages, such as good neutronic economy, 233U production and less production of long-lived α emitter high radiotoxic wastes in biological internal exposure point of view.
Źródło:
Nukleonika; 2014, 59, 4; 129-136
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wypalenie zawodowe w pracy nauczyciela przedszkola
Autorzy:
Fijałkowska-Mroczek, Agata
Powiązania:
https://bibliotekanauki.pl/articles/2157864.pdf
Data publikacji:
2017
Wydawca:
Instytut Studiów Międzynarodowych i Edukacji Humanum
Tematy:
burn-out syndrome
defines
introduces it levels
work
teacher
pre-school
profession
Opis:
The article contains the definition of professional burn-out and introduces it levels. In the paper, there are presented pilot research results conducted among the pre-school teachers in Poland and Slovakia. Research results were analysed through a comparative analysis. In the paper there are identified the levels of the professional burn-out of the examined teachers, namely: emotional exhaustion, deperson- alization, and the decreasing of the personal success satisfaction.
Źródło:
Społeczeństwo i Edukacja. Międzynarodowe Studia Humanistyczne; 2017, 1(24); 29-37
1898-0171
Pojawia się w:
Społeczeństwo i Edukacja. Międzynarodowe Studia Humanistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of Nanostructures in UO$\text{}_{2}$ Fuel at High Burn-ups
Autorzy:
Szuta, M.
Bocar, I.
Powiązania:
https://bibliotekanauki.pl/articles/2035481.pdf
Data publikacji:
2002-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
25.85.Ec
66.30.Lw
Opis:
In the present paper it is assumed that above a limiting value of fission fluency (burn-up) a more intensive process of irradiation induced chemical interaction occurs. A significant part of fission gas product is thus expected to be chemically bounded in the matrix of UO$\text{}_{2}$ fuel. The fission gas atoms substituting, for example, uranium atoms in the crystallographic lattice can form weak facets. At a certain saturation condition, division of the grains can occur at the weak facets and the increase in fission-gas-products release may be expected. The fact that the process of grain division for high burn-ups (70-80 MWd/kgU) forms an extremely fine structure up to a temperature as high as 1100$\text{}^{º}$C and simultaneously the observed decrease in fission gas concentration in the fuel supports this concept. The analysis of fission gas concentration change due to the formation of nanostructures in UO$\text{}_{2}$ fuel at high burn-ups in terms of total surface area change in a function of burn-up and knock-out process is presented.
Źródło:
Acta Physica Polonica A; 2002, 102, 2; 207-213
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Potential of Bacteriophages in the Treatment of Burn Wounds
Autorzy:
Hoff -Lenczewska, Diana
Kawecki, Marek
Glik, Justyna
Klama-Baryła, Agnieszka
Nowak, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/1396443.pdf
Data publikacji:
2013-10-01
Wydawca:
Index Copernicus International
Źródło:
Polish Journal of Surgery; 2013, 85, 10; 615-618
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lean-burn combustion systems in spark ignitron engines: advantages and limitations
Autorzy:
Gorczakowski, A.
Jarosiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/244092.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
lean combustion
high compression ratio
combustion in swirl
Opis:
Spark-ignited internal combustion engines are in the use for over130 years (first example was presented by Otto in 1876). The engine development is directed to more power, better efficiency and lower emissions. Mixture formation and in-cylinder motion are the main parameters of the combustion process improvement. One of the effective methods of engine development is lean combustion. Application of lean-burn combustion systems in spark ignitron engines has been proposed many times. Such systems have several important advantages in comparison with conventional systems. Lean-burn combustion makes possible engine operation at high compression ratio, equivalent to high thermal efficiency and at low emission of toxic components of the combustion gases. Lean-burn combustion is also a subject of serious limitations, requiring remedial steps. General limitations are introduced by a fall of the reaction rate, equivalent to increased time of combustion. Lean-burn combustion introduces also changes to flame structure: it contributes with increased flame thickness and with a rise of quenching distance. These changes influence limit conditions of spark ignition. The only solution omitting this threat might be obtained by replacing of a spark ignition by another ignition system or by application of a spark ignition system with increased distance between electrodes and with much higher ignition energy. Typical solutions rationalizing lean-burn combustion in engines are discussed in the paper and some limit conditions highlighted..
Źródło:
Journal of KONES; 2008, 15, 2; 97-102
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-attribute Utility Theory analysis for burn-in processes combined with replacement
Analiza połączonych procesów sztucznego starzenia i wymiany prowadzona w oparciu o wieloatrybutową teorię użyteczności
Autorzy:
Cavalcante, C. A. V.
Do Nascimento, T. G.
Lopes, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/302065.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
burn-in
multi-attribute utility theory
replacement
residual life
sztuczne starzenie
wieloatrybutowa teoria użyteczności
wymiana
trwałość resztkowa
Opis:
Components from a heterogeneous population may result in non-well behaviour in the failure rate function. This paper considers a population of components that consists of two different sub-populations: a population of weak components and a population of strong components. This component heterogeneity is treated using a mixture distribution for the components’ lifetimes. This mixture models two distinct behaviours: a short characteristic lifetime for the weak components and a long characteristic lifetime for the strong components. Simple policies may not be effective to address the distinct behaviours of failures for these components. Thus, combined preventive replacement and a burn-in procedure based on a multi-criteria perspective are proposed in order to suitably integrate the different objectives from the burn-in and preventive replacement procedures, taking into account the preferences of the decision-maker. We consider the cost and the mean residual life as the criteria of the proposed model. Multi-attribute Utility Theory (MAUT) allows alternatives that are more aligned with the preferences of the decision-maker to be developed.
Elementy składowe tworzące niejednorodną populację mogą prowadzić do nieprawidłowości funkcji intensywności uszkodzeń. W prezentowanej pracy badano populację komponentów składająca się z dwóch różnych subpopulacji: populacji komponentów słabych i populacji komponentów mocnych. Niejednorodność komponentów opisano za pomocą rozkładu mieszanego ich czasu pracy. Rozkład mieszany pozwala modelować dwa różne zachowania: krótki czas pracy charakterystyczny dla słabych elementów i długi czas pracy charakterystyczny dla elementów mocnych. Proste strategie konserwacyjne mogą nie dawać oczekiwanych efektów w przypadku komponentów, które różnią się pod względem charakteru uszkodzeń. Aby odpowiednio powiązać odmienne cele procedur sztucznego starzenia (wygrzewania, docierania) i wymiany profilaktycznej elementów składowych zaproponowano, w oparciu o podejście wielokryterialne, procedurę łączącą sztuczne starzenie i wymianę profilaktyczną, która uwzględnia także preferencje decydenta. Jako kryteria proponowanego modelu rozważano koszty i średnią trwałość resztkową. Wieloatrybutowa teoria użyteczności (MAUT) pozwala na tworzenie alternatyw, które licują z preferencjami osoby odpowiedzialnej za podejmowanie decyzji eksploatacyjnych.
Źródło:
Eksploatacja i Niezawodność; 2016, 18, 4; 599-605
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biological Dressings as a Substitutes of the Skin in the Treatment of Burn Wounds
Autorzy:
Gierek, Marcin
Kawecki, Marek
Mikuś, Karolina
Klama-Baryła, Agnieszka
Nowak, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/1396256.pdf
Data publikacji:
2013-06-01
Wydawca:
Index Copernicus International
Źródło:
Polish Journal of Surgery; 2013, 85, 6; 354-359
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Efficiency of Burn Wounds Debridement with Use of Hydrosurgery - Our Experiences
Autorzy:
Kawecki, Marek
Mikuś-Zagórska, Karolina
Glik, Justyna
Nowak1, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/1395208.pdf
Data publikacji:
2015-03-01
Wydawca:
Index Copernicus International
Tematy:
debridement
hydrosurgery
water jet
Opis:
The aim of the study was to present experience of doctors from the Center for Burns Treatment in Siemianowice Śląskie who use a Versajet system. Material and methods. Debridement with the use of a water jet was applied in 70 patients with IIbo /IIIo thermal burns in the period between 2009-2013. The corresponding evaluation involved duration of operation, locations, wound surfaces and technique of debridement after operation. Microbiological tests were also performed before and after debridement. Results and conclusions. In the paper, its authors draw attention to the short time of debridement. The application of a water jet allows precise debridement, particularly in hardly accessible places, preparation of wounds to be covered with autologous split thickness skin graft, protection of healthy tissues.
Źródło:
Polish Journal of Surgery; 2015, 87, 1; 1-5
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inhibitors of thermally induced burn incidents – the examinations of the flammability, TGA, SAXS and SEM methods
Inhibitory modelowych incydentów oparzeniowych – charakterystyka palności, badania TGA, SAXS i SEM
Autorzy:
Pielesz, A.
Gawłowski, A.
Fabia, J.
Ślusarczyk, C.
Sarna, E.
Powiązania:
https://bibliotekanauki.pl/articles/946948.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
collagen of skin
burn incidents
L-ascorbic acid
sodium ascorbate
orthosilicic acid
LOI
TGA
SAXS
SEM
kolagen
incydent oparzeniowy
kwas L-askorbinowy
askorbinian sodu
kwas ortokrzemowy
Opis:
The examinations of the skin flammability, small-angle X-ray scattering (SAXS) and thermogravimetric (TGA) investigations were all carried out in temperature sufficient for simulating a burn incident. Above methods were used to perform assessment of collagen molecular structure changes in conditions of thermal oxidative stress, whereas the scanning electron microscopy analysis (SEM) was used to illustrate skin surface changes. The changes were observed in the presence of active antioxidants such as L-ascorbic acid, sodium ascorbate and hydrogel of orthosilicic acid H4SiO4 • n H2O. Presence of these modifiers of the burn process minimizes external effects of simulated burn incidents for model samples of animal skin and burn wound epidermis extracted from the patients. The examinations of the skin flammability were carried out with the limited oxygen index (LOI) method. In this study, synergy between orthosilicic acid and L-ascorbic acid and sodium ascorbate into animal and human skin has been shown through an increase in LOI values. The treatment by means of L-ascorbic acid affects particular morphological changes in the skin which is visible in SEM method. Skin samples incubated in the solution of the 3.5 %, 5 % L-ascorbic acid, 7 % sodium ascorbate solutions and 7 % orthosilicic acid demonstrate the development of a structure resembling a coherent solid composite. SAXS gives structural information on the assembly of dermal collagen as well as the lamellar organization of stratum corneum (SC) lipids located in the outermost part of the epidermis. Using this technique, two lamellar phases with repeat distance of approximately 4.3 and 6 nm in the SC lipids domains were observed. Moreover, the diameter of the collagen fibrils were extracted. The observed differences in the values of these parameters allowed us to better understand the mechanism of modification of the surface of the burn affected skin and the influence of the modification on the process of skin regeneration.
Miejscowa oraz ogólna odpowiedź organizmu na oparzenie termiczne jest złożona. Nie tylko prowadzi do uszkodzenia skóry, ale wywołuje też głębokie długotrwałe zmiany w metabolizmie organizmu. Na podstawie wyznaczonego granicznego wskaźnika palności (LOI), wyników analizy termograwimetrycznej (TGA) i małokątowej dyfraktometrii rentgenowskiej (SAXS) oceniano zmiany zachodzące w strukturze kolagenu w warunkach stresu oksydacyjnego, a metodą skaningowej mikroskopii elektronowej (SEM) określano zmiany topografii powierzchni badanych próbek skóry. Modyfikowany aktywnymi przeciwutleniaczami, takimi jak: pochodne witaminy C (np. kwas L-askorbinowy, askorbinian sodu) oraz hydrożel kwasu ortokrzemowego H4SiO4 • n H2O. Kolagen wykazuje zwiększoną aktywność biochemiczną, a obecność niniejszych modyfikatorów procesu oparzeniowego minimalizuje zewnętrzne skutki symulowanych incydentów oparzeniowych.
Źródło:
Polimery; 2017, 62, 11-12; 806-811
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 82

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