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Wyszukujesz frazę "Mueller, G." wg kryterium: Autor


Wyświetlanie 1-4 z 4
Tytuł:
Sitting Comfort of Ergonomic Office Chairs—Developed Versus Intuitive Evaluation
Autorzy:
Mueller, G. F.
Hassenzahl, M.
Powiązania:
https://bibliotekanauki.pl/articles/90809.pdf
Data publikacji:
2010
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
sitting comfort
office chair
ergonomic chair layout
developed evaluation
intuitive evaluation
sensory awareness
Opis:
The sitting comfort of office chairs with different ergonomic layouts (inferior, superior) was examined. Fifty participants were randomly assigned to a 2 × 5 factorial experimental design with 2 different conditions of ergonomic chair layout (inferior or superior) and 5 different conditions of instruction to explore the chair. Four conditions were created to differentiate between various levels of perceptual awareness and processing of chair-related information (guided exploration and developed evaluation). In a 5th condition, participants remained uninstructed (free exploration and intuitive exploration). Under guided exploration, the participants’ perception of sitting comfort was in line with objective differences in the chair layout. Different conditions of guided exploration, however, did not influence the evaluations. Under free exploration, the participants’ perceptions did not match the ergonomic chair layout. In contrast to participants under guided exploration, they even rated the ergonomically inferior office chair more favourably than the ergonomically superior chair.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2010, 16, 3; 369-374
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Investigation of Plasma Formation Process by Interaction of Intense Electron Beams with Metallic Targets
Autorzy:
An, W.
Engelko, V.
Mueller, G.
Weisenburger, A.
Powiązania:
https://bibliotekanauki.pl/articles/1807985.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.68.+m
29.25.Bx
41.75.Ak
Opis:
Electron beams with energies ≥ 100 keV offer attractive possibilities to modify metallic surfaces. Numerous experiments with the electron accelerators GESA I and II showed excellent results regarding the improvement of mechanical properties and the enhancement of the corrosion resistance of the treated materials. The next step leads to further technological adaptation of the process that especially was focused on the adaptation of the electron beam to the surface geometry. For the treatment of the outer surface of tubes the electron beam facility GESA IV with a radial converged electron beam was designed. In first experiments unexpected electrical short-circuiting after different time periods occurred. Two major reasons could be identified: excessive plasma formation at the cathode and target plasma formation. The latter can be controlled by vacuum conditions and surface cleaning of the target, the first by controlling the duration of plasma formation at the cathode.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1183-1185
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gas-Insulated Self-Breakdown Spark Gaps: Aspects on Low-Scattering and Long-Lifetime Switching
Autorzy:
Frey, W.
Sack, M.
Wuestner, R.
Mueller, G.
Powiązania:
https://bibliotekanauki.pl/articles/1807888.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.75.Kq
52.80.Mg
Opis:
The influence of the electric field distribution between the electrodes and the seed electron generation rate on the scattering of the breakdown voltage of $SF_{6}$-insulated spark gaps was investigated. The breakdown voltage scattering considerably can be reduced by applying large-gap-volume, uniform-field electrode profiles instead of spherical shaped electrodes. Moreover, uniform field electrode profiles exhibit an uniform discharge probability in the entire gap volume and following an almost uniform erosion of electrode material along the electrode's surface. This preserves electrode shape and switching performance of the spark gap for a long maintenance-free lifetime. Breakdown voltage scattering further can be reduced by increasing the seed electron generation in the gap by an auxiliary corona discharge adjacent to the main gap. The experimental observations are discussed on the basis of the volume time law for discharge initiation.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1016-1018
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intense Pulsed Electron Beams Application οf Modified Materials
Autorzy:
Weisenburger, A.
An, W.
Engelko, V.
Heinzel, A.
Jianu, A.
Lang, F.
Mueller, G.
Zimmermann, F.
Powiązania:
https://bibliotekanauki.pl/articles/1807912.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.41.Qb
81.40.Pq
81.65.Kn
Opis:
Intense pulsed electron beams have been applied for surface modification of materials in our laboratory for several years. An improvement of properties like wear, corrosion and oxidation resistance was found. Three different modification modes can be distinguished: rapid melting and solidification, surface alloying of coatings into the bulk and surface fusing of coatings to the bulk. All three surface treatment processes were investigated using the GESA (Gepulste Elektronen Strahl Anlage) facilities having following parameters: accelerating voltage 80-400 kV; power-density 2-6 MW/$cm^{2}$; beam diameter 4-10 cm; pulse duration 4-250 μs. Such pulses applied on material surfaces lead to a change in microstructure and in the case of surface alloying also to a change in chemical composition. This paper will give an overview on applications in different fields of surface modified materials.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1053-1055
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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