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Tytuł:
Characterization of surface type partial discharges using electrical, acoustic emission and UHF methods
Autorzy:
Kunicki, M.
Cichoń, A.
Powiązania:
https://bibliotekanauki.pl/articles/114691.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
partial discharges
PD measurements
UHF method
AE method
IEC60270
transformer fault diagnosis
Opis:
This paper presents research results related to measurements of partial discharges (PD), which may occur in oil insulation systems of electric power transformers. Three measuring methods were considered: electrical (apparent charge - IEC60270), acoustic emission (AE) and ultra-high frequency (UHF) method. Research works have been proceeded under laboratory condition. PD were generated using special apparatus and spark gap configuration for surface PD modeling. Measurements were performed simultaneously for each of the regarded methods and were repeated for selected supply voltage levels. The electrical and UHF methods measurements were made using MPD measuring system from Omicron. The AE method measurements were made using a piezoelectric transducer, which was installed on the outer transformer tank wall. Comparative analysis of signals gathered during research works was made. Possibilities of application of the three considered PD detection methods for electric power systems with oil insulation were proposed in the paper.
Źródło:
Measurement Automation Monitoring; 2015, 61, 1; 12-15
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time and frequency domain analysis of partial discharges using electrical method
Autorzy:
Kunicki, M.
Cichoń, A.
Powiązania:
https://bibliotekanauki.pl/articles/973070.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
partial discharges
electrical method
IEC 60270
frequency domain
time domain
Opis:
Partial discharge (PD) measurement results with particular consideration of time domain and frequency domain analysis of pulses generated by PD model sources are presented in the paper. Three different PD generation model sources are selected for the research: surface type, point to point and multi-point to plate. All measurements are proceeded under laboratory conditions using electrical method of a PD detection, according to the IEC60270 standard. Various amplitude and power density spectrum descriptors are proposed, as well as PD source type identification abilities on grounds of the selected descriptors are considerated. Electrical power transformers on-line PD detection and evaluation systems improvement and development are the main purpose of the presented research. Laboratory experiment results gives a solid base for further research focused on verification of the proposed methodology on a real life apparatus.
Źródło:
Measurement Automation Monitoring; 2016, 62, 2; 72-77
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of a Phase Resolved Partial Discharge Pattern Analysis for Acoustic Emission Method in High Voltage Insulation Systems Diagnostics
Autorzy:
Kunicki, M.
Cichoń, A.
Powiązania:
https://bibliotekanauki.pl/articles/177912.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic emission
partial discharge
transformer diagnostics
insulation system
Opis:
An alternative method for analysis of acoustic emission (AE) signals generated by partial discharges (PD), based on a correlation between voltage phase run and AE pulses, so called phase resolved PD pattern (PRPD), is presented in the paper. PRPD pattern is a well-known analysis tool commonly used in such PD diagnostic methods as conventional electrical and UHF ones. Moreover, it yields various signal analysis abilities and allows a direct correlation indication between measurement results achieved using different methods. An original PRPD measurement methodology applied for AE method as well as some exemplary measurement results and further data analysis capabilities are presented in the paper. Also a comparative analysis of PRPD patterns achieved using various measurement methods and different PD source configurations have been investigated. All presented experiments were done under laboratory conditions using PD model sources immersed in the insulation oil. The main purpose of the presented research is to indicate an all-embracing analytical tool that yields an ability to direct comparison (qualitative as well as quantitative) of the AE measurement results with other commonly applied PD measurement methods. The presented results give a solid fundamental for further research work concerning a direct correlation method for AE and other described in the paper diagnostic techniques, mainly in order to continue PD phenomena analysis and assessment in real life high voltage apparatus insulation systems under normal onsite operation conditions.
Źródło:
Archives of Acoustics; 2018, 43, 2; 235-243
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Descriptors of Acoustic Emission Signals Generated by Partial Discharges under Laboratory Conditions and in On-Site Electrical Power Transformer
Autorzy:
Kunicki, M.
Cichoń, A.
Borucki, S.
Powiązania:
https://bibliotekanauki.pl/articles/176881.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic emission
partial discharge
transformer diagnostics
Opis:
An acoustic emission method (AE) is widespread and often applied for partial discharge (PD) diagnostics, mainly due to its ease of application as well as noninvasiveness and relatively high sensitivity. This paper presents comparative analysis of AE signals measurement results archived under laboratory conditions as well as on-site actual AE signals generated by inside PDs in electrical power transformer during its normal service. Three different PD model sources are applied for laboratory research: point to point, multipoint to plate and surface type. A typical measuring set up commonly used for on-site transformer PD diagnostics is provided for the laboratory tasks: piezoelectric joint transducer, preamplifier, amplifier and measuring PC interface. During the on-site research there are three measuring tracks applied simultaneously. Time domain, time-frequency domain and statistical tools are used for registered AE signals analysis. A number of descriptors are proposed as a result of the analysis. In the paper, attempt of AE signals descriptors, archived under laboratory condition application possibilities for on-site PD diagnostics of power transformers during normal service is made.
Źródło:
Archives of Acoustics; 2016, 41, 2; 265-276
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aktywność fizyczna kobiet cierpiących na chorobę Parkinsona
Physical activity of women suffering from Parkinson’s disease
Autorzy:
Cholewa, J.
Kunicki, M.
Rafalska, B.
Powiązania:
https://bibliotekanauki.pl/articles/12781.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Szczeciński
Opis:
Positive importance of physical activity (PA) in preventing in a wider sense disability in people with Parkinson’s disease (PD) is widely known. PA taken regularly causes maintenance of physical fitness, functional independence and quality of life. The aim of the study was to determine the level of physical activity of women with PD. The study involved 29 women diagnosed with PD, in stage II disease according to Hoehn and Yahr’a scale, and 40 women declaring themselves as healthy. To assess the level of physical activity applied international physical activity questionnaire (IPAQ), in short version. The results obtained in the different groups were compared using analysis of variance. The study showed that the level of physical activity of women with PD varies depending on participation in the rehabilitation process. A statistically significant difference was seen in the level of the PA of women who did not take part in the rehabilitation process compare with healthy subjects, and PA level of women with PD participating in the rehabilitation process was similar to physical activity of healthy people. The conclusion was about needing to take actions to develop a strategy of physical activation for women with the PD.
Źródło:
Aktywność Ruchowa Ludzi w Różnym Wieku; 2016, 4[32]
2299-744X
Pojawia się w:
Aktywność Ruchowa Ludzi w Różnym Wieku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena składu ciała u osób trenujących pływanie i hokej na lodzie
Assessment of body composition in people practicing swimming and ice hockey
Autorzy:
Nowosielska-Swadzba, D.
Kunicki, M.
Zwolinska, D.
Powiązania:
https://bibliotekanauki.pl/articles/13237.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Szczeciński
Opis:
The aim of this research was to assess body composition of young people at the aged of 17–19, who are practicing ice hockey and swimming by bioelectrical impedance method. The study involved 27 people who are practicing ice hockey, 21 swimmers, and 19 physically inactive people. Rated primary somatic parameters: height [cm], weight [kg], BMI [kg/ m2], fat-free mass FFM [kg], FAT [kg,%], total body water TBW [kg%] Rohrer’s index. To assess the significance of differences in the tested parameters between the groups was used the non-parametric Kruskal – Wallis test. In the study there were statistically significant differences in specific parameters between tested groups.
Źródło:
Aktywność Ruchowa Ludzi w Różnym Wieku; 2016, 2[30]
2299-744X
Pojawia się w:
Aktywność Ruchowa Ludzi w Różnym Wieku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aktywność fizyczna u kobiet uczęszczających do Akademii Fitness w Raciborzu
Physical activity among women attending the Academy of Fitness in Raciborz
Autorzy:
Zwolinska, D.
Kunicki, M.
Nowosielska-Swadzba, D.
Powiązania:
https://bibliotekanauki.pl/articles/12388.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Szczeciński
Opis:
Research objective was to determine socio-demographic profile, the barriers that hinder physical activity and the motivation of women involved in some forms of fitness activity. The popularity of various forms of activities and the frequency of exercise undertaken, were also determined. The research was conducted in September 2015 among women attending the Academy of Fitness in Racibórz. The research group consisted of 67 women. Age varied, ranging from 21 – 68 years. For the purpose of this research, a diagnostic survey method was applied, using a questionnaire as a research tool. The questionnaire was completed, using the traditional method. The women participating in the study generally had a higher education and were economically active. The respondents most frequently participated in activities 2 – 3 times per week. The main motive behind their choice of physical activity was a concern for health. ABT (Abdominal Buttocks Things) and TBC (Total Body Conditioning) classes were the most popular. The most common reasons given for choosing these kinds of activities were mainly: concern for health, better posture and the atmosphere in the class. In the opinion of the respondents, lack of motivation as well as health are usually barriers to physical activity. Physical activity is an important part of a healthy lifestyle regardless of age.
Źródło:
Aktywność Ruchowa Ludzi w Różnym Wieku; 2016, 2[30]
2299-744X
Pojawia się w:
Aktywność Ruchowa Ludzi w Różnym Wieku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Demographic characteristics and AMH levels in rural and urban women participating in an IVF programme
Autorzy:
Kunicki, M.
Łukaszuk, K.
Liss, J.
Jakiel, G.
Skowrońska, P.
Powiązania:
https://bibliotekanauki.pl/articles/2081527.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
infertility
assisted reproductive technique
in vitro fertilization
anti mullerian hormone
Opis:
Objective. The primary aim of this preliminary study was to compare the IVF results of couples living in rural and urban areas. Additionally, the ovarian reserve parameters, such as AMH concentrations, were compared for the same groups. Materials and method. The database of 1,265 women undergoing in vitro fertilization at the Invicta Fertility Center between May 2011-July 2012 were retrospectively analyzed. Women undergoing their first assisted reproductive technology cycle with ICSI, stimulated according to the long protocol, and whose AMH levels were measured using the same DSL kit, were selected. Ultimately, 651 women were included in the study. All participants were categorized based on the area where they live: rural areas, small towns (<100,000 inhabitants) and large cities (>100,000) Results. The mean age of the patients living in large cities was significantly higher in comparison to those from rural areas and small towns. A significantly higher pregnancy body mass index (BMI) was found in women from rural areas in comparison to the women living in small and large towns. Serum AMH and inhibin B concentrations, number of ampules of gonadotropins, and antral follicle count (AFC), did not differ significantly among the groups. The study showed no significant differences among the groups in terms of clinical pregnancy rate, both per started cycle and per embryo transfer. Conclusions. No significant differences were found in IVF outcomes among the groups inhabiting rural areas, small and large cities.
Źródło:
Annals of Agricultural and Environmental Medicine; 2018, 25, 1; 120-123
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Sub-Wavelength Effective Refractive Index Layer on the Transmittance of LYSO Scintillator
Autorzy:
Modrzyński, P.
Olejniczak, A.
Zięba, A.
Kunicki, P.
Tomanik, M.
Wielebski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032338.pdf
Data publikacji:
2017-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Bs
42.25.Gy
42.79.Dj
02.70.Bf
78.70.Ps
29.40.Mc
Opis:
From various types of scintillating materials lutetium-yttrium oxyorthosilicate (LYSO) has the highest luminosity and the greatest potential of application in high-energy radiation detectors. Due to the small critical angle of total internal reflection the enhancement of the extraction of light outside a scintillator is a challenge. We study numerically the influence of the effective refractive index layer on the transmittance of LYSO crystal. It is possible to realize such layer by sub-wavelength patterning of crystal surface using for example focused ion beam. The enhancement of transmittance of LYSO crystal up to 100% as well as the possibility to tune the positions of transmittance maxima have been shown.
Źródło:
Acta Physica Polonica A; 2017, 131, 6; 1565-1569
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wide-band optical fibre system for investigation of MEMS and NEMS deflection
Autorzy:
Orłowska, K.
Świątkowski, M.
Kunicki, P.
Słupski, P.
Sankowska, A.
Gotszalk, T.
Powiązania:
https://bibliotekanauki.pl/articles/221558.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fibre optic sensors
amplitude detection
intensity detection
MEMS/NEMS deflection measurement
Opis:
In this work the construction of experimental setup for MEMS/NEMS deflection measurements is presented. The system is based on intensity fibre optic detector for linear displacement sensing. Furthermore the electronic devices: current source for driving the light source and photodetector with wide-band preamplifier are presented.
Źródło:
Metrology and Measurement Systems; 2014, 21, 3; 381-388
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 11

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