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Gerwin Preisinger 《电机与控制应用》2008,35(12)
早期的风力发电机轴承失效频繁发生,原因多种多样,在研究应用条件和调查轴承失效的基础上,基本确认了造成轴承失效的根本原因:双馈感应发电机变频驱动所导致的轴承过电流和相应的电腐蚀及润滑、磨损等。对风力发电机轴承早期失效的根本原因进行论述,同时介绍了SKF最新大型混合陶瓷深沟球轴承在减小轴承失效、增加运行可靠性方面的优势及其在风力发电机应用中的解决方案。 相似文献
3.
Edzer Huitema Gerwin Gelinck Bas van der Putten Eugenio Cantatore Karel Kuijk Kees Hart Dago De Leeuw 《Journal of the Society for Information Display》2002,10(3):195-202
A 2‐in. active‐matrix display was demonstrated, containing 4096 solution‐processed polymer‐based transistors. By using the polymer‐dispersed liquid‐crystal display (LCD) effect, this results in a reflective, low‐power display with paper‐like contrast. The influence of the transistor parameters on the display performance is analyzed by use of a model for charging and discharging of the pixel capacitors. Good agreement was obtained between the model and the experimental data. Scaling behavior allows estimation of the performance required for transistors in a quarter‐VGA display. These requirements are met by solution‐processed pentacene transistors. 相似文献
4.
Manufacturing firms in many North American industries are struggling with whether to continue to produce major components for their systems or end-products. In some instances, the suppliers of these very components are also dealing with whether to produce them or merely design them. Large end-product firms and some semiconductor merchants, for example, are calling into question the internal fabrication of chips. This paper examines what can be done to increase the strategic value of an internal chip facility. It discusses six specific activities many of which focus on better satisfying the needs of a fabricator's internal or external customers. By taking the initiative in implementing these activities fabrication management will have identified a seventh way to add value. The recommendations made here also have general implications for firms that produce major components other than semiconductors, and for companies supplied with these components by strategic partners 相似文献
5.
Gelinck GH Huitema HE van Veenendaal E Cantatore E Schrijnemakers L van der Putten JB Geuns TC Beenhakkers M Giesbers JB Huisman BH Meijer EJ Benito EM Touwslager FJ Marsman AW van Rens BJ de Leeuw DM 《Nature materials》2004,3(2):106-110
At present, flexible displays are an important focus of research. Further development of large, flexible displays requires a cost-effective manufacturing process for the active-matrix backplane, which contains one transistor per pixel. One way to further reduce costs is to integrate (part of) the display drive circuitry, such as row shift registers, directly on the display substrate. Here, we demonstrate flexible active-matrix monochrome electrophoretic displays based on solution-processed organic transistors on 25-microm-thick polyimide substrates. The displays can be bent to a radius of 1 cm without significant loss in performance. Using the same process flow we prepared row shift registers. With 1,888 transistors, these are the largest organic integrated circuits reported to date. More importantly, the operating frequency of 5 kHz is sufficiently high to allow integration with the display operating at video speed. This work therefore represents a major step towards 'system-on-plastic'. 相似文献
7.
Internal Magnetic Structure of Nanoparticles Dominates Time‐Dependent Relaxation Processes in a Magnetic Field 下载免费PDF全文
8.
Gerwin de Haan René Molenaar Michal Koutek Frits H. Post 《Computer Graphics Forum》2007,26(3):695-704
In projection-based Virtual Reality (VR) systems, typically only one headtracked user views stereo images rendered from the correct view position. For other users, who are presented a distorted image, moving with the first user's head motion, it is difficult to correctly view and interact with 3D objects in the virtual environment. In close-range VR systems, such as the Virtual Workbench, distortion effects are especially large because objects are within close range and users are relatively far apart. On these systems, multi-user collaboration proves to be difficult. In this paper, we analyze the problem and describe a novel, easy to implement method to prevent and reduce image distortion and its negative effects on close-range interaction task performance. First, our method combines a shared camera model and view distortion compensation. It minimizes the overall distortion for each user, while important user-personal objects such as interaction cursors, rays and controls remain distortion-free. Second, our method retains co-location for interaction techniques to make interaction more consistent. We performed a user experiment on our Virtual Workbench to analyze user performance under distorted view conditions with and without the use of our method. Our findings demonstrate the negative impact of view distortion on task performance and the positive effect our method introduces. This indicates that our method can enhance the multi-user collaboration experience on close-range, projection-based VR systems. 相似文献
9.
Ren M.J. Benders Rixt Kok Henri C. Moll Gerwin Wiersma Klaas Jan Noorman 《Energy Policy》2006,34(18):3612-3622
Large-scale energy reduction campaigns focusing on households generally have two shortcomings. First, an energy reduction campaign is either personalized but time intensive or time extensive but generalized. Second, because only the direct energy requirements are addressed, only 50% of the total household energy requirement is subject to reduction. The other 50%, the indirect energy requirement, is much more difficult to calculate and address and therefore not subject to reduction.
In this paper, we describe a web-based tool that has the potential to overcome both of these shortcomings. The tool addresses direct as well as indirect energy requirements. By means of a simple expert system participants obtain personalized reduction options and feedback on the energy reduced. The tool was tested in Groningen (the Netherlands) with a sample of 300 households, resulting in a direct energy reduction of about 8.5% compared to a control group. The reduction in indirect energy was not statistically significant. 相似文献
10.
Sandra P. van Tongeren Gerwin C. Raangs Gjalt W. Welling Hermie J. M. Harmsen Janneke Krooneman 《Microgravity science and technology》2006,18(3-4):219-222
Potentially pathogenic microbes and so-called technophiles may form a serious threat in advanced life support systems, such as the International Space Station (ISS). They not only pose a threat to the health of the crew, but also to the technical equipment and materials of the space station. The development of fast and easy to use molecular detection and quantification methods for application in manned spacecraft is therefore desirable and may also be valuable for applications on Earth. In this paper we present the preliminary results of the SAMPLE experiment in which we performed molecular microbial analysis on environmental samples of the ISS as part of an ESA-MAP project. 相似文献