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Tytuł:
Study of an Ultra-Compact, Repetitive Marx Generator for High-Power Microwave Applications
Autorzy:
Bischoff, R.
Charon, R.
Duperoux, J.
Martin, B.
Pinguet, S.
Powiązania:
https://bibliotekanauki.pl/articles/1807853.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.30.Ng
84.32.Hh
84.32.Tt
84.60.Ve
Opis:
The need for repetitive high-power microwave systems, for instance within the scope of convoy protection, requires the availability of compact, repetitive pulsed-power generators. The development and the first experimental results of an upgraded balanced ISL Marx generator for future repetitive operations at pulse repetition frequencies in the order of 100 Hz are introduced. A key objective is to keep the fundamental modular coaxial concept by reason of its scalability and compactness. Simulation models were developed under the PSpice software package in order to investigate the charging and discharging phases of the Marx generator and also to determine the design criteria for repetitive operations. The charging resistors were replaced by ultracompact inductors for rapid charging, being able to withstand pulsed voltages up to 60 kV and pulsed currents up to 1.4 kA during the discharge phase. An improved type of strontium-titanate high-voltage ceramic capacitor was successfully tested experimentally up to 70 kV. Each new elementary stage of the Marx generator consists of eight 1.1 nF sectors of a cylinder capacitors mounted in parallel, two charging inductors of about 17.8 μH and two halves of spherical spark gaps. The pressurized self-triggered gas switches are arranged along the axis for fast consecutive breakdown thanks to the UV radiation emitted during the breakdown in each gap. The stages are installed in individual fibreglass housings. First experimental results of a 4-stage Marx generator in repetitive operation, driven by a 4 kW capacitor charging power supply up to a maximum voltage of 40 kV, are presented.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 964-966
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Screening commercial drivers for obstructive sleep apnea: Validation of STOP-Bang questionnaire
Autorzy:
Popević, Martin B.
Milovanović, Andjela
Nagorni-Obradović, Ljudmila
Nešić, Dejan
Milovanović, Jovica
Milovanović, Aleksandar P.
Powiązania:
https://bibliotekanauki.pl/articles/2161889.pdf
Data publikacji:
2017-07-14
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
sleep apnea
questionnaires
polysomnography
obstructive
validation studies
commercial drivers
Opis:
Objectives The main aim has been to examine psychometric properties of STOP-Bang (snoring, tiredness, observed apnea, high blood pressure, body mass index (BMI), age, neck circumference, male gender) scoring model (Serbian translation), an obstructive sleep apnea (OSA) screening tool, in a sample of commercial drivers. Material and Methods After formal translation, validation was performed on a sample of bus and truck drivers evaluating test-retest reliability, construct and criterion validity. Overnight polysomnography or cardiorespiratory polygraphy were used for OSA diagnosis purposes. Results One hundred male participants, 24–62 years old, were included. STOP-Bang classified 69% as potential OSA patients. Polysomnography identified OSA in 57% of the sample. Test-retest reliability (Cohen’s κ = 0.89) was adequate. STOP-Bang score was significantly correlated to apnea-hypopnea index (AHI) and OSA severity. Sensitivity was 100% for AHI ≥ 15, highest specificity was 53.5% (AHI ≥ 5). Conclusions STOP-Bang showed good measurement properties, supporting its further use in OSA screening of commercial drivers. Int J Occup Med Environ Health 2016;30(5):751–761
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2017, 30, 5; 751-761
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Authors’ response (November 28, 2017) to the letter to the Editor concerning the paper “Screening commercial drivers for obstructive sleep apnea: Validation of STOP-Bang questionnaire”
Autorzy:
Popević, Martin B.
Milovanović, Andjela
Nagorni-Obradović, Ljudmila
Nešić, Dejan
Milovanović, Jovica
Milovanović, Aleksandar P.
Powiązania:
https://bibliotekanauki.pl/articles/2162021.pdf
Data publikacji:
2018-10-24
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
sleep apnea
questionnaires
polysomnography
obstructive
validation studies
commercial drivers
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2018, 31, 5; 699-701
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The elusiveness of progressive masculinity: Gender differences in conceptualizations of nontraditional gender roles
Autorzy:
Calton, Jenna M.
Heesacker, Martin
Perrin, Paul B.
Powiązania:
https://bibliotekanauki.pl/articles/438029.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
masculinity
femininity
progressive
nontraditional
gender roles
Opis:
Traditional masculinity has been thoroughly explored in psychological research, but its counterpart, progressive masculinity, has undergone relatively little scientific investigation. To determine whether this lack of attention to or understanding of progressive masculinity is mirrored more largely in mainstream culture, we examined how men and women conceptualize and experience gender roles in their everyday lives. Participants were randomly assigned to describe a time in which they had behaved either traditionally or progressively with regard to their gender. Over 80% of men and women in the traditional condition and women in the progressive condition provided condition-appropriate examples. However, men in the progressive condition only provided progressive examples 17% of the time, suggesting that many men may not have an understanding of progressive masculinity. Additional themes, implications, and directions for research on progressive masculinity are discussed.
Źródło:
Journal of Gender and Power; 2014, 2; 37-58
2391-8187
Pojawia się w:
Journal of Gender and Power
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-infectious Health Risks of Young Adults Serving in International Volunteer Services
Autorzy:
Küpper, Thomas
Neppach, K.
Martin, J.
Heggie, Travis
Rieke, B.
Powiązania:
https://bibliotekanauki.pl/articles/2098194.pdf
Data publikacji:
2020-12-11
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Tematy:
wolontariat
bezpieczeństwo
zdrowie
podróże
wypadki
przemoc
stres
aktywność seksualna
volunteer service
safety
health
pre-travel advice
accidents
violence
psychosocial stress
sexual activity
Opis:
Introduction: Young people serving as volunteers in international projects show a different risk profile to “normal” travellers. Data are scarce. While infectious risks were published elsewhere we focus now on non-infectious risks. Material and methods: 153 questionnaires, obtained from volunteers returning from their project were evaluated. Questions included age, situation abroad (living space and work), travel experience, region of the project, language skills, pre-travel advise, type of problems abroad (accidents, traffic, violence, robbery, sexual assault, psychosocial stress etc.). Results: Several factors, normally not included in pre-travel advice, cause significant psychosocial stress which decreases a bit during the stay. Special problems are insufficient language skills, (subjective) safety at night, traffic / transport, and violence. Psychosocial stress was the most important reason to stop the activity and to return home ahead of schedule (4% of all volunteers). Conclusions: Pre-travel advice of young volunteers should include psychosocial factors and other topics additional to infectious diseases, vaccination, and hygiene. Sufficient training in common but minor medical problems (headache, sunburn, minor wounds) is a “must”. A comprehensive advice and training may need two days and may be realized in groups of 5 to 12 participants. Health and safety should become a more important topic of all projects.
Źródło:
Health Promotion & Physical Activity; 2020, 13, 4; 29-39
2544-9117
Pojawia się w:
Health Promotion & Physical Activity
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the photosynthetic pathway on the hydrogen isotopic profile of glucose
Autorzy:
Zhang, B.
Billault, I.
Li, X.
Mabon, F.
Remaud, G.
Martin, M.
Powiązania:
https://bibliotekanauki.pl/articles/146974.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
deuterium
glucose
isotope ratio
plant metabolism
SNIF-NMR
Opis:
The SNIF-NMR method (site-specific natural isotope fractionation studied by Nuclear Magnetic Resonance) was used to examine the isotopic profile of glucoses derived from plants with different photosynthetic pathways. It is shown that the type of photosynthetic metabolism, either C3 (beet-root, orange, grape), C4 (maize, sugar-cane) or CAM (pineapple), exerts a strong influence on the deuterium distribution in the sugar molecules. The isotopic profile also depends, secondarily, on the physiological status of the precursor plant. Consequently, the isotopic fingerprint of glucose may be a rich source of information in mechanistic comparisons of metabolic pathways. Moreover, from an analytical point of view, it may provide complementary criteria with respect to the ethanol probe for origin inference of sugars.
Źródło:
Nukleonika; 2002, 47,suppl.1; 63-65
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Petrology and geochemistry of rapakivi-type granites from the crystalline basement of NE Poland
Autorzy:
Bagiński, B.
Duchense, J.
Auwera, J. van der
Martin, H.
Wiszniewska, J.
Powiązania:
https://bibliotekanauki.pl/articles/2059326.pdf
Data publikacji:
2001
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Mazury complex
rapakivi-type granites
jotunite
granite modelling
Opis:
80 rock samples from drill-cores at 8 localities in the Mazury complex (Polish part of the crystalline East European Craton), representing rock types from monzodiorites to leucogranites, were studied for major, trace and REE elements by XRF and ICP-MS methods. The range in composition of the investigated rocks varies from 46 to 76% SiO2 contents. All of them show similar REE distributions, which suggests that they are genetically linked. They also plot along a major trend with many similarities to the jotunitic liquid line of descent defined in AMCG rocks from Rogaland (Norway). Each group of rocks has however its own specific pattern of elements.
Źródło:
Geological Quarterly; 2001, 45, 1; 33-52
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geomorphic dynamics of gullies developed in sandy slopes of Central Spain
Autorzy:
Lucía, A.
Martín-Duque, J. F.
Laronne, J. B.
Sanz-Santos, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/294675.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
sand
gullies
Terrestrial Laser Scanner (TLS)
Reid bedload sampler
erosion-runoff plots
Spain
Opis:
Gullies developed on sandy lithologies are scarce. Such landforms have developed in the sandy deposits of the Cretaceous 'Utrillas' facies within the Segovia province of Central Spain. They appear at the slopes of a group of mesas and cuestas located at the edge of the northern piedmont of the Guadarrama Mountains of the Spanish Central System. The activity of the different geomorphic processes acting in these gullies, as well as their connectivity, are being characterized and quantified. This study was preceded by reconnaissance methods, whereas presently technologically advanced and more accurate techniques are being utilized. The new methods are applied in an experimental catchment (1.26 ha). They include: i) an automatic Reid-type (formerly termed Birkbeck) slot bedload sampler for continuous monitoring of bedload flux and for continuous sampling of bedload; siphons for sampling the suspended load; and a Parshall flume to monitor water discharge. Jointly, these instruments allow to study the fluvial dynamics at the catchment mouth; ii) topographic surveys undertaken by a Terrestrial Laser Scanner (TLS) to quantify the activity of gravitational, overland flow and fluvial processes in different sediment source areas within the gully basin; iii) micro runoff and erosion plots to monitor the infiltration and erosive response of different Hydrologic Response Units (HRU) comprising the interior of the catchment. This ensemble of novel methods has started providing patterns of sediment movement within the gully system.
Źródło:
Landform Analysis; 2011, 17; 91-97
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
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