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排序方式: 共有708条查询结果,搜索用时 15 毫秒
71.
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Katja Lerch Prof. Dr.‐Ing. Jörg Hinrichs Patrizia Dittmer Dr. Johannes Rauschnabel 《化学,工程师,技术》2013,85(3):323-332
Falling films in wash down process are of major interest for pharmaceutical isolators, which are used for processing of highly potent pharmaceutical products. In this study multiple process parameters were examined with common materials of isolator systems. The importance of material and surface finish in respect of cleanability and complete wetting as well as a combination of process parameters are presented and discussed. For cleaning validation an effect of high interest was discovered: swab sampling areas changed their properties over many repeated cycles and showed decreased cleanability. 相似文献
73.
Katja Leowsky 《Datenschutz und Datensicherheit - DuD》2011,35(6):412-416
Der Beschluss des KG Berlin hat gro?e Beachtung in der Anwaltschaft gefunden. Die Entscheidung ist damit Gegenstand vieler
zustimmender Bewertungen. Die folgenden Ausführungen sollen einerseits die Fehler der Entscheidung aufzeigen und andererseits
einen Gegenpol zu diesen Auseinandersetzungen darstellen. 相似文献
74.
Ruhul Amin Chengtian Lin Jubo Peng Katja Weichert Tolga Acartürk Ulrich Starke Joachim Maier 《Advanced functional materials》2009,19(11):1697-1704
Single crystals of silicon doped LiFePO4 with a silicon content of 1% are grown successfully by the floating zone technique and characterized by single‐crystal and powder X‐ray diffraction, secondary ion mass spectroscopy, and chemical analysis. Electron paramagnetic resonance demonstrates the presence of only Fe2+; no traces of Fe3+ are found. Impedance spectroscopy as well as step‐function polarization/depolarization (DC) measurements are carried out using the cells Ti/LiFe(Si)PO4/Ti and LiAl/LiI/LiFe(Si)PO4/LiI/LiAl. The electronic and ionic conductivities as well as the Li‐diffusivity of the sample in the major crystallographic directions ([h00], [0k0], and [00l]) are determined. Within experimental error the transport properties along the b‐ and c‐axes are found to be the same but differ significantly from the a‐axis, which exhibits lower values. Compared to undoped LiFePO4, Si‐doping leads to an increase of the ionic conductivity while the electronic conductivity decreases, which is in agreement with a donor effect. The activation energies of conductivities and diffusivities are interpreted in terms of defect chemistry and relevant Brouwer diagrams are given. 相似文献
75.
Katja König Saša Novak Aldo R. Boccaccini Spomenka Kobe 《Journal of Materials Processing Technology》2010,210(1):96-103
The electrophoretic deposition (EPD) method was investigated for the preparation of compacts from nanosized alumina powders. Ethanol suspensions of commercially available nanosized transition alumina and α-alumina powders were used. In addition, submicron powders were also considered for comparison. Besides the influence of operational pH change, the influence of the addition of three different surfactants – two branched polyethylene imines with molecular masses 1800 and 10,000, and citric acid—on the zeta-potential of the particles in ethanol and afterwards on the EPD was investigated.The packing density of the green parts prepared by the EPD of nanosized α-alumina powders at 30 V/cm was low (the green density was 27 vol. % of the theoretical density—TD), and a bimodal pore size distribution was observed. In contrast, the packing density in deposits made with the transition alumina nanopowder was much higher (the green density was 42 vol. % of the TD) and a monomodal distribution of pores was observed. In general, for all the deposits made from nanosized alumina powders, the particle-packing density was found to be lower than for those made from the submicron alumina powders (a green density equal to 59 vol. % of the TD). 相似文献
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CA Berrevoets P Doesburg K Steketee J Trapman AO Brinkmann 《Canadian Metallurgical Quarterly》1998,12(8):1172-1183
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