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Wyświetlanie 1-10 z 104
Tytuł:
Improved Photovoltaic Properties Of Dye-Sensitized Solar Cells Using Laser Patterned F-Doped SnO2 Thin Films
Poprawa właściwości fotowoltaicznych ogniw słonecznych uczulonych barwnikiem przez laserową modyfikację powierzchni cienkich warstw SnO2
Autorzy:
An, H.-R.
An, H.
Riu, D.-H.
Ahn, H. J.
Tematy:
dye-sensitized solar cells
F-doped SnO2 thin films
surface morphology
laser patterning
fotowoltaniczne ogniwa słoneczne
cienkie warstwy SnO2
morfologia powierzchni
modyfikacja laserowa
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/353636.pdf  Link otwiera się w nowym oknie
Opis:
We modified the surfaces of F-doped SnO2 thin films using laser patterning to improve the photovoltaic properties of dye-sensitized solar cells. To do so, we varied the laser power density and the distance between laser-patterned lines. First, we investigated three power densities. Higher densities led to higher sheet resistances owing to increases in surface roughnesses. The lowest power density increased surface roughness without electrical degradation. Next, we explored three line spacings at a fixed power density. The films with the narrowest spacing exhibited the highest power conversion efficiency (~7.00%), the highest short-circuit photocurrent density (16.28 mA/cm2), and a good fill factor (58.82%).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Salvinialean megaspores in the Late Cretaceous of southern Patagonia, Argentina
Autorzy:
Santamarina, P.E.
Barreda, V.D.
Iglesias, A.
Varela, A.N.
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/21754.pdf  Link otwiera się w nowym oknie
Opis:
We report here two megaspores species related to the aquatic ferns of the order Salviniales from the Late Cretaceous Mata Amarilla Formation (Austral Basin), southern Santa Cruz Province, Argentina. We identified the species Arcellites disciformis and Balmeisporites cf. B. holodictyus. The presence of A. disciformis, in particular, is significant not only because it represents the first record for the Southern Hemisphere, indicating a bi-hemispheric distribution for the species, but also because it increases the diversity of this genus in Patagonia. The new findings of salvinialean megaspores highlight the importance of water ferns in the Late Cretaceous aquiferous enviroments of southern South America. The common occurrences of Arcellites and Balmeisporites, whether in shallow, fresh or brackish water facies, indicates aquatic paleoenvironment of the Mata Amarilla Formation, as was inferred also from the sedimentological evidence. Their presence also indicates that the lower and middle levels of the Mata Amarilla Formation can be attributed to the megaspore Zone M3 (Albian–Cenomanian) defined for the Cretaceous of Patagonia.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Epidemiology of Musculoskeletal Symptoms Among Korean Hospital Nurses
Autorzy:
Smith, D. R.
Choe, M. A.
Jeon, M. Y.
Chae, Y. R.
An, G. J.
Jeong, J. S.
Tematy:
musculoskeletal symptoms
nurse
Korea
low back pain
epidemiology
kręgosłup
warunki pracy
ból mięśniowy
personel pielęgniarski
personel pomocniczy służby zdrowia
szpitale
choroby narządów ruchu
wypalenie zawodowe
zmęczenie nerwowe
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Wydawca:
Centralny Instytut Ochrony Pracy
Powiązania:
https://bibliotekanauki.pl/articles/90718.pdf  Link otwiera się w nowym oknie
Opis:
We investigated the epidemiology of musculoskeletal symptoms (MSS) among a complete cross-section of 330 nurses from a large Korean hospital, by means of a questionnaire survey (response rate: 97.9%). The prevalence of MSS at any body site was 93.6%, with symptoms most commonly reported at the shoulder (74.5%), lower back (72.4%), neck (62.7%), lower legs (52.1%) and hand/wrist (46.7%). Logistic regression indicated that nurses who undertook manual handling of patients were 7.2 times as likely to report MSS (OR 7.2, 95%CI 1.2–42.3, P = .0275), while nurses suffering from periodic depression experienced a 3.3-fold MSS risk (OR 3.3, 95%CI 1.3–8.3, P = .0104). Overall, our study suggests that Korean nurses incur a very high MSS burden when compared internationally. A greater commitment is needed to improve physical conditions, occupational tasks and psychosocial work issues among nurses in this country.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cyclic movement execution and its influence on motor programmess
Autorzy:
Dornowski, M.
Gorkovenko, A.
Tomiak, T.
Mishchenko, V.S.
Wilczyńska, D.
Olszewski, H.
Sawicki, P.
Talnov, A.N.
Tematy:
locomotion
mechanics
water sport
environment
rural and urban areas
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Wydawca:
Instytut Medycyny Wsi
Powiązania:
https://bibliotekanauki.pl/articles/2083070.pdf  Link otwiera się w nowym oknie
Opis:
Objectives. The aim of this study was to discover the relationship between the performance of different mechanical movements of rowers, and define its effect on the motor programs of the cyclic movement in athletes living in rural and urban areas. Materials and method. Twenty-two male rowers participated in the experiment using a rowing ergometer (Concept2, USA). The experiment consisted of 3 tests examining the maximal power of the pull-ups (MPbpu). The movement mechanogram was registered with a specialized complex Noraxon’s 3D MyoMotion (Noraxon Inc., USA). The software of the complex allowed calculation of the values of the joint angles from the accelerometer data. The Origin Lab 8.5 program was used for the mathematical and statistical processing of the signals from the mechanograms. Results. It was found that all experiment participants had a stepped controlled increase in the power of single bar pull-ups leading to a corresponding proportional increase in the frequency of rowing – test 1 and, conversely, a stepped controlled increase in the rowing frequency accompanied by a proportional increase in the power of the bar pull-ups – test 2. The involuntary dependence of the power and the rate was due to the peculiarities of the central cyclic movement programming, according to which the forces and durations of the active and passive bar pull-ups phases were interconnected and regulated together. The voluntary power-rate dependence control led to the breakdown of these links in the motor program of cyclic movements and to the separate control of these parameters. Conclusions. Motor programs in cyclic movement may be created in the same pattern in tope level sport and recreation, as well in different environmental conditions – gym halls (movement simulators), professional and recreational water sport tracks.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 104

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