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Wyświetlanie 1-15 z 402
Tytuł:
From negative to positive effects of secondary exposure to trauma – the mediating role of cognitive coping strategies
Autorzy:
Ogińska-Bulik, Nina
Michalska, Paulina
Juczyński, Zygfryd
Powiązania:
https://bibliotekanauki.pl/articles/28410620.pdf
Data publikacji:
2023-12-29
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
stress
professionals
exposure to secondary trauma
secondary posttraumatic stress
secondary posttraumatic growth
cognitive coping strategies
Opis:
Background Professionals working with trauma victims can experience both negative and positive effects following exposure to secondary trauma. The aim of the study was to determine the relationship between secondary traumatic stress (STS), secondary posttraumatic growth (SPTG) and cognitive coping strategies and to establish the mediating role of cognitive coping strategies in the relationship between STS and SPTG. Material and Methods A group of 500 professionals working with trauma survivors were surveyed. The Secondary Traumatic Stress Inventory, the Secondary Posttraumatic Growth Inventory and the Cognitive Processing of Trauma Scale was used. Results The results indicated that 29% of professionals demonstrate a high intensity of STS, and nearly 34% exhibit a high level of SPTG. Denial and regret were positively correlated with STS; positive cognitive restructuring, resolution/acceptance and downward comparison were positively related to SPTG. Two cognitive coping strategies, i.e., positive cognitive restructuring and downward comparison, were found to act as mediators in the relationship between STS and SPTG. Conclusions Understanding the effects of secondary exposure to trauma and the coping responses of professionals working with trauma survivors will support the development of prevention and intervention actions aimed at protecting them from the deleterious impact of exposure to secondary trauma at work and promoting secondary posttraumatic growth.
Źródło:
Medycyna Pracy. Workers’ Health and Safety; 2023, 74, 6; 449-460
0465-5893
2353-1339
Pojawia się w:
Medycyna Pracy. Workers’ Health and Safety
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Negative and Positive Consequences of Secondary Trauma Exposure Among Police Officers
Autorzy:
Bąk, Grzegorz
Ogińska-Bulik, Nina
Powiązania:
https://bibliotekanauki.pl/articles/45259387.pdf
Data publikacji:
2023-01-10
Wydawca:
Akademia Policji w Szczytnie
Tematy:
police officers
exposure to secondary trauma
secondary traumatic stress
posttraumatic growth
Opis:
Police officers belong to the occupational group that is particularly exposed to work related stress. As part of their official duties officers help people who have experienced traumatic situations in their lives. Long-term contact and helping trauma victims may on the one hand cause certain negative consequences in the form of secondary traumatic stress, and on the other, can be a source of positive changes, understood as secondary posttraumatic growth. The aim of the study is to determine the severity of negative and positive posttraumatic changes among police officers exposed to secondary trauma and their connections with sociodemographic variables, workload and history of one’s own trauma. The research also aims to determine the relationship between the negative and the positive consequences of secondary exposure to trauma. 520 police officers on duty and in contact with trauma victims took part in the research. The study used a survey specifically developed for this purpose and two standard measurement tools, i.e.: the Secondary Traumatic Stress Inventory and Posttraumatic Growth Inventory. The officers participating in the study displayed relatively low intensity of negative consequences of exposure to secondary trauma, as well as varying levels of positive posttraumatic changes — 40% of respondents showed a low, 34% an average and 26% a high degree of secondary growth. Sociodemographic variables and workload had little influence on the occurrence of both negative and positive consequences of secondary exposure to trauma. A factor that significantly differentiated the severity of secondary stress and growth was their own history of trauma. Moreover, the obtained results showed positive relations between secondary stress and secondary growth
Źródło:
Przegląd Policyjny; 2022, 147(3); 323-342
0867-5708
Pojawia się w:
Przegląd Policyjny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An improved method for RNA isolation from plants using commercial extraction kits
Autorzy:
Kalinowska, Elżbieta
Chodorska, Maria
Paduch-Cichal, Elżbieta
Mroczkowska, Karolina
Powiązania:
https://bibliotekanauki.pl/articles/1039717.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
total RNA
secondary metabolites
Opis:
Isolation of RNA from plants rich in secondary metabolites using commercial kits often results in contaminated preparations which are not suitable for downstream applications. Although many specific protocols appropriate for plants with a high content of phenolics, anthocyanins and polysaccharides have been developed, these are often expensive, time consuming and not applicable to different types of tissues. This study presents a simple and efficient modification of RNA extraction from different types of tissues using two commercial reagent kits. By simple improvement, we routinely obtained high-quality RNA of the following plants: the blackcurrant bush, black chokeberry bush, pear tree, apricot tree, apple tree, hardy kiwi, tangerine tree, highbush blueberry and cranberry plant.
Źródło:
Acta Biochimica Polonica; 2012, 59, 3; 391-393
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Size, shape and secondary structure of calponin.
Autorzy:
Czuryło, Edward
Eimer, Wolfgang
Kulikova, Natalia
Hellweg, Thomas
Powiązania:
https://bibliotekanauki.pl/articles/1044328.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
dynamic light scattering
secondary structure prediction
calponin
circular dichroism
secondary structure estimation
Opis:
The overall size and shape of the chicken gizzard calponin (CaP) h1 molecule was investigated by dynamic light scattering (DLS) measurements. From the DLS experiments, a z-averaged translational diffusion coefficient is derived (5.75 ± 0.3) × 10-7cm2s-1, which corresponds to a hydrodynamic radius of 3.72 nm for calponin. The frictional ratio (1.8 for the unhydrated molecule and 1.5 for the hydrated one) suggests a pronounced anisotropic structure for the molecule. An ellipsoidal model in length 19.4 nm and with a diameter of 2.6 nm used for hydrodynamic calculations was found to reproduce the DLS experimental data. The evaluation of the secondary structure of CaP h1 from the CD spectra by two independent methods has revealed that it contains, on average, 23% helix, 19% β-strand, 18% β-turns and loops, and 40% of remainder structures. These values are in good agreement with those predicted from the amino-acid sequence. Predictions used for CaP h1 were applied to other isoforms of known sequences and revealed that all calponins share a common secondary structure. Moreover, the predicted structure of the calponin CH domain is identical to that found by X-ray studies of the spectrin, fimbrin and utrophin CH domains.
Źródło:
Acta Biochimica Polonica; 2000, 47, 3; 791-806
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revealing and vetting of dynamic secondary metabolites position for isolation of antidermatophytic molecules from 20 aboriginal plants
Autorzy:
Singh, P. Shivakumar
Vidyasagar, G. M.
Powiązania:
https://bibliotekanauki.pl/articles/1076129.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Aboriginal plants
antidermatophytic
dynamic secondary metabolites
phytochemical locations
vetting of secondary metabolites
Opis:
Aboriginal plants and their information clubbed with their potentiality. Majority of the secondary metabolites are the basic therapeutics. Usually these establishes in higher plants are gratifying all the time more noteworthy in drug scheming. In the current report, 100 different solvent extracts of 20 aboriginal plant species from Hyderabad Karnataka region were screened for their leading constituents of secondary metabolites. As of each one of plant species particular part of five successive extracts were particular for the revealing of impending metabolites. Intended for the vetting of secondary metabolites the criterion tests undertaken i.e., cluster wise for alkaloids dragendroff’s, tannin for ferric chloride, phenolics for lead acetate, glycoside for keller-killiani test, flavonoids for NaOH and saponins for foam test. The obvious ranges of secondary metabolites in the vein of non-polar to polar have been pragmatic. The utmost detection of alkaloids, tannins established at non-polar range whereas in middle polar flavonoids, tannins have been noticed. Glycosides and saponins entirely found at high polar. The upshot of the in attendance report will be very much constructive for isolation of diverse group of resulting metabolites in accumulate the time, chemicals, vigour utilization in active fragment drug design.
Źródło:
World Scientific News; 2019, 116; 25-35
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Views on the Autonomy of Czech Students of Technically and Vocationally Oriented Secondary Schools and the Influence of the Significant Others on Career Decisionmaking
Autorzy:
Hlaďo, Petr
Powiązania:
https://bibliotekanauki.pl/articles/45883247.pdf
Data publikacji:
2012-12-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
career decisionmaking
further course of education choice
occupation choice
secondary school graduate
parents
significant others
secondary technical school
secondary vocational school
Opis:
The presented empirical study deals with the career decisionmaking of Czech students of secondary technical (ISCED 3A) and secondary vocational schools (ISCED 3C). In the given population it is a difficult decisionmaking process with several critical moments. What is presented are partial findings of students’ and their parents’ views on the autonomy of the student and the influence of the significant others on career decisionmaking. The instrument of data collection was paired questionnaires for final-year students and their parents. Data collection took place in March and April 2011 at twenty secondary schools in four regions of the Czech Republic. The sample consisted of 442 students and the same number of parents. Although students as well as parents were inclined to believe that career decisionmaking should be mainly an autonomous affair of the student, the empirical findings show a not negligible influence of parents. Other significant others were attributed a smaller degree of influence by the respondents.
Źródło:
The New Educational Review; 2012, 30; 193-205
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conceptualizing meaning
Autorzy:
Doomen, Jasper
Powiązania:
https://bibliotekanauki.pl/articles/577040.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
meaning
reference
secondary reference
existence
Opis:
Descriptions have been the object of attention of many philosophers. The goal of this article is to inquire into the meaning of those descriptions which, due to the peculiar character of the objects of description, have been interpreted in different ways, and to investigate in which sense one is able to speak of the existence (or non-existence) of an object of description. The various sorts of descriptions are inquired; the question which entities exist and which do not is dealt with, and, in relation to this, how ‘meaning’ is to be understood.
Źródło:
Linguistica Silesiana; 2012, 33; 39-51
0208-4228
Pojawia się w:
Linguistica Silesiana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tracking daily steps: an investigation on a small post-secondary campus
Autorzy:
Bradford, Brent D.
Howorko, Adam
Jacula, Erinn
Daniels, Jason
Hunt, Shaelyn
Correia, Nicole
Powiązania:
https://bibliotekanauki.pl/articles/1030920.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
daily steps
physical activity
physical activity technology
post-secondary faculty/staff
post-secondary students
Opis:
The production of mood-regulating chemicals (e.g. serotonin) may be impacted through prolonged or acute stress events. If a serotonin-deficit exists, depression-related illnesses may result, with such illnesses projected to become the second highest lifetime burden of disease. Critically, physical activity has been found to assist in increasing serotonin levels, positively impacting adult neurogenesis and mood. The purpose of this study was to track daily steps (physical activity) employing a stepcounting technology across a small Canadian university. Guided by the research questions: Can tracking daily steps encourage elevated levels of physical activity? and What differences, if any, exist between physical activity levels amongst students and faculty/staff?, such an understanding may add to the current body of knowledge concerning physical activity levels in educational institutions. Over a 9-week period, students (n = 32) took significantly more steps than faculty/staff (n = 16), and significantly more in Week 9 than in Week 2.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2020, 31, 3; 75-86
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Predictors of the Consequences of Secondary Exposure to Trauma Among Professionals Working With Trauma Victims
Autorzy:
Juczyński, Zygfryd
Ogińska-Bulik, Nina
Powiązania:
https://bibliotekanauki.pl/articles/31343460.pdf
Data publikacji:
2023
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
secondary traumatic stress
secondary posttraumatic growth
core beliefs
cognitive processing of trauma
discriminant function analysis
Opis:
Helping those who have experienced trauma exposes the helpers to secondary traumatization. The mechanisms of its development are most often explained using the cognitive model of trauma processing. The aim of the research is to determine how disturbances of core beliefs and cognitive processing in the form of coping with stress are associated with secondary traumatic stress (STS) and secondary posttraumatic growth (SPTG). The study was conducted among psychologists and social workers (N = 240), working with people after traumatic experiences. Four standardized measurement tools were used. Based on the differential diagnosis, four types of consequences were identified. Discriminant analysis was used to establish the optimal configuration of predictors explaining the differences between the four subgroups. Two significant discriminant functions were significant, each identifies different beliefs and coping strategies. The first is associated with the disruptions of core beliefs about the world and cognitive processing in the form of a non-adaptive strategy; the second—with disturbed beliefs about oneself and adaptation strategies. Our results show a much greater exposure of social workers to the negative consequences of secondary traumatic stress disorder. A system of constant monitoring should be introduced, and the principles of prevention and therapy should be implemented.
Źródło:
Roczniki Psychologiczne; 2023, 26, 3; 241-260
1507-7888
Pojawia się w:
Roczniki Psychologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microplastics from Plastic Waste as a Limitation of Sustainability of the Environment
Autorzy:
Grąz, Katarzyna
Generowicz, Agnieszka
Kwaśny, Justyna
Gronba-Chyła, Anna
Kwaśnicki, Paweł
Ciuła, Józef
Łapiński, Jacek
Bajdur, Wioletta
Powiązania:
https://bibliotekanauki.pl/articles/30145698.pdf
Data publikacji:
2023
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
nanoparticles
waste plastics
DLS
secondary plastic
Opis:
The massive emergence of plastics has contributed to their widespread use in everyday life. Unfortunately, the lack of appropriate technologies for processing these materials has contributed to environmental pollution by plastic particles. This study investigated the possibility of obtaining nanoparticles from selected plastics such as polyethylene and polyethylene terephthalate. Polyethylene was obtained from plastic bag waste, and polyethylene terephthalate was from crushed plastic bottles of mineral water. The first stage of nanoparticle production was to grind the collected used plastic waste, i.e., plastic bags and plastic bottles, to the smallest possible size using a cutting mill. Next, the waste was ground in a planetary-ball mill and then homogenised in a homogeniser. The particle size distribution of the obtained particles for selected waste plastics was examined using the Dynamic Light Scattering (DLS) method. The objective of the work was achieved – as a result of the performed procedures, nanoparticles of waste plastics were obtained. The following average sizes for particular materials were obtained: plastic bottles (PET) 212.81 nm, plastic bags (PE) 208.14 nm, and smaller particles, e.g. 27.74 nm.
Źródło:
Rocznik Ochrona Środowiska; 2023, 25; 367-373
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Child Abuse Investigation: Police Officers and Secondary Traumatic Stress
Autorzy:
MacEachern, A. D.
Jindal-Snape, D.
Jackson, S.
Powiązania:
https://bibliotekanauki.pl/articles/90027.pdf
Data publikacji:
2011
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
child protection
secondary traumatic stress
police
Opis:
Child protection is an area of police work which has expanded in the last decade, leading to an increase in the number of police officers working in departments which specialise in investigating cases of child abuse. Police officers in this field may be at greater risk of experiencing secondary traumatic stress but there remains a paucity of research in this area of policing. Analogies can be drawn to existing research in policing and with social service workers involved in child protection. The paper finishes off with implications for police forces to ensure safe working environments and appropriate counselling for employees.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2011, 17, 4; 329-339
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation of the influence of a fillet and a bulb on the secondary flow in a compressor cascade
Autorzy:
Hoeger, M.
Schmidt-Eisenlohr, U.
Gomez, S.
Sauer, H.
Müller, R.
Powiązania:
https://bibliotekanauki.pl/articles/1986762.pdf
Data publikacji:
2002
Wydawca:
Politechnika Gdańska
Tematy:
secondary flow
compressor cascade
fillet
bulb
Opis:
Large fillet radii are typically found on highly loaded compressor rotors to ensure structural integrity. The objective of this paper is to investigate the impact of such real geometry effects on the flow at the hub section. Investigations were performed numerically for the idealised case of a plane compressor cascade with the 3D Navier-Stokes code TRACE_S. Realistic inlet boundary layer displacement thickness and typical loading levels close to stall are considered at low inlet Mach numbers Ma1 = 0.23. A large fillet with a relative radius of 16% chord length is considered as well as a 3D leading edge bulb-configuration designed at TU Dresden. The results are discussed in terms of iso-Mach surfaces, secondary flow patterns and spanwise incidence and turning. A complex 3D vortex system rises from the fillet radius, which improves the aerodynamic behaviour of the cascade at the end-wall section. With the bulb configuration the suction surface horse-shoe vortex leg was demonstrated to weaken the undesirable cross flow and by that to reduce the hazard of corner stall.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 1; 25-37
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineralogical and geochemical studies of secondary mineral assemblages related to deterioration of building materials
Autorzy:
Marszałek, Mariola
Dudek, Krzysztof
Gaweł, Adam
Czerny, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2058620.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
stone deterioration
secondary salts
aphthitalite
darapskite
Opis:
The study was aimed at mineralogical and geochemical characteristics of secondary phases related to deterioration of historic building materials. The investigations, carried out in the Holy Trinity Basilica in Kraków, Poland, focused on the southern facade of the 17th-century Myszkowskis Chapel, built of the Miocene Pińczów limestone. Lower part of the facade is covered with a cement render, and the exposed foundations are made of Jurassic limestone and Cretaceous sandstone, both of local origin from the Kraków region and neighbouring Carpathians, in the form of irregular blocks bound with a cement mortar. The wall surface exhibits clear signs of damage; from dark grey soiling and scaling to efflorescences. Sampled materials, deteriorated, altered crusts and efflorescences were analysed with optical and scanning electron microscopy, X-ray diffraction, and Raman microspectroscopy methods. The secondary minerals distinguished include abundant gypsum CaSO42H2O, less common thenardite Na2SO4 (and/or mirabilite Na2SO410H2O), aphthitalite (K, Na)3Na(SO4)2, darapskite Na3(SO4)(NO3)H2O, ettringite Ca6Al2(SO4)3(OH)12 26H2O, monosulphite Ca4Al2O6SO311H2O, as well as scarce nitre KNO3, nitratine NaNO3 and halite NaCl. Gypsum usually forms surface crusts and fills the pores inside some materials. The efflorescences, sampled from the exposed foundations, consisted of thenardite and/or mirabilite, aphthitalite and darapskite, whereas ettringite and monosulphite were connected with cement renders. Traces of nitre, nitratine and halite were detected at various elements of the chapel facade and foundations. The origin of the salts is related to composition and physicochemical properties of the building materials, as well as to anthropogenic factors.
Źródło:
Geological Quarterly; 2019, 63, 4; 683--698
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A parameter study on the influence of fillets on the compressor cascade performance
Badania parametryczne wpływu powierzchni przejściowej łopatek na wydajność sprężarki kaskadowej
Autorzy:
Meyer, R.
Schulz, S.
Liesner, K.
Passrucker, H.
Wunderer, R.
Powiązania:
https://bibliotekanauki.pl/articles/281953.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
fillet
compressor
blade
losses
secondary flow
Opis:
In order to evaluate the influence of fillets in a high speed compressor cascade with an aspect ratio of h/c = 1 a parameter study has been performed. Fillets of different radii from 1 to 5mm (2.5%c-12.5%c) between the side wall and stator vanes have been investigated at inlet Mach numbers of M = 0.5 and M = 0.66 and at a Reynolds number of Re = 5.6 ź 105 based on the chord length. The heights of the fillets were chosen with regard to manufacturing aspects for blade integrated disks (Blisk). The measurements were accomplished with a total pressure rake combined with angle probes which provides information on total pressure loss, efficiency and outflow angle of the cascade. For comparison and estimation of the performance of the fillet equipped cascade a reference cascade without fillets was measured and the differences between the individual test cases will be shown in quantitative numbers and values as well as qualitative pictures. In the measurements for this paper a dependence between the fillet height and the total pressure loss coefficient became apparent.
W celu oszacowania wpływu powierzchni przejściowej łopatek w wysokoobrotowych sprężarkach kaskadowych o współczynniku kształtu h/c = 1 na ich wydajność w pracy przeprowadzono analizę parametryczną układu. Profile przejściowe o promieniach zaokrągleń od 1 do 5mm (2.5%c-12.5%c) pomiędzy powierzchnią osadzenia a łopatką kierownicy badano dla prędkości napływu 0.50-0.66M i liczbie Reynoldsa Re = 5.6 ź 105 przy zadanej długości cięciwy łopatki. Wysokość profilu przejściowego dobrano ze względów technologicznych typowych dla dysków zintegrowanych z łopatkami. Pomiary dokonano za pomocą czujników ciśnienia i próbników kątowych, co pozwoliło na zgromadzenie informacji o całkowitych stratach ciśnienia, sprawności i wartości kąta odpływu z kaskady. Dla celów porównawczych i wyznaczenia wydajności sprężarki przeprowadzono pomiary w kaskadzie referencyjnej pozbawionej powierzchni przejściowych. Różnice dla poszczególnych testów pokazano ilościowo na wartościach konkretnych parametrów i jakościowo na odpowiednich rysunkach. Pomiary wykazały wyraźną zależność pomiędzy wysokością profilu przejściowego i współczynnikiem całkowitych strat ciśnienia.
Źródło:
Journal of Theoretical and Applied Mechanics; 2012, 50, 1; 131-145
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two vortex interaction patterns in a turbine rotor
Autorzy:
Świrydczuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/258702.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
secondary vortices
turbine rotor
interaction pattern
Opis:
The article analyses the unsteady interaction of vortex structures in a turbine rotor passage. In the form of sample cases, two high-pressure steam turbine stages are examined: a standard stage, used as the reference, which reveals regular performance characteristics and distributions of flow parameters, and a low-efficiency stage, in which a large separation zone is observed in the rear part of the rotor passage. In the latter case the combined interaction of all vortices has been found to take an extremely complex course and be a source of remarkable flow fluctuations. The methodology applied for extracting particular vortex structures from the general flow pattern bases on comparing entropy distributions with corresponding velocity vectors. The reported vortex interaction patterns are believed to be representative for a variety of turbine constructions of both land, and marine applications.
Źródło:
Polish Maritime Research; 2009, 2; 45-53
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
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