In this paper, to analyze the discontinuity structure of E-plane metal insert by mode matching method, and metal insert thickness
and resonator length impact on filter design.
This work was supported by the Natural Science Foundation of Jiangsu Province of China under Grant No. BK2008357. 相似文献
Currently, infection control guidelines in hospitals and other health care institutions are more expert-driven than user-oriented. In order to enhance the usability of the expert-driven guideline format, we developed a website for the communication of existing guidelines that better fit the practical information needs of health care workers (HCWs). We employed a user-centered design process that involved two studies.In the initial study, 28 HCWs were asked to solve tasks using existing, paper-based infection control guidelines. In order to detect their strategies and problems, the participants were asked to think aloud. Usability problems occurred due to poorly structured information, insufficient quality of information, and a mismatch between experts’ and HCWs’ vocabulary. To overcome these shortcomings, three design principles were applied for communicating infection control guidelines: better navigation (the guidelines should be searchable in several ways); multimodality (the guidelines should not be presented as text only), and action-orientation (the guidelines should be presented as HCWs’ behaviors). A website was developed to meet these principles.In the second study, the same 28 HCWs completed tasks identical to those of the first study while thinking aloud, but this time using the website. The percentage of correctly completed tasks increased and the mean time for task completion decreased significantly. Also, respondents were more satisfied with the website than the paper-based guidelines. The number of problems due to poor information quality and a mismatch in vocabulary declined, although the number of structural problems increased. This can probably be explained by the fact that the navigation structure was user-generated (using Card Sort), in contrast to a standardized answer format based on common usability principles.Overall, we found that involving HCWs in the development process is important to create a sense of ownership and to foster the implementation of the guidelines, which might eventually result in compliance and reduce health care-associated infections. This paper outlines concrete steps for how to involve HCWs in the design process. 相似文献
The configuration and mechanical behavior of steel-concrete composite cable-pylon anchorage in cable-stayed bridges are very complex. Considerable local deformation of composite cable-pylon anchorage zone could occur under the horizontal component of the inclined cable force. It is difficult and unfeasible to analyze the horizontal mechanical behavior of the composite cable-pylon anchorage by the traditional analytical theory of composite structures. In this paper, full-scale model tests were carried out according to an actual project to analyze the horizontal mechanical behavior of composite cable-pylon anchorage. Stress distribution patterns of the main members and the failure modes were obtained. Structural response of the anchorage was analyzed by spatial solid and shell finite element model. By analyzing and simplifying the configuration and details of the structure, the expression for calculating the horizontal force burdened by the main members of composite cable-pylon was derived based on the deformation compatibility principle. The equation for calculating internal forces of the main members in the composite cable-pylon anchorage was also obtained. It is shown that the proposed simplified method agree well with the experimental result and finite element method result. 相似文献
Arch dam deformation is comprehensively affected by water pressure, temperature, dam’s structural behavior and material properties as well as other factors. Among them the water pressure and temperature are external factors (source factors) that cause dam deformation, and dam’s structural behavior and material properties are the internal factors of deformation (resistance factors). The dam deformation is the result of the mutual game playing between source factors and resistance factors. Therefore, resistance factors of structure and materials that reflect resistance character of arch dam structure are introduced into the traditional model, where structure factor is embodied by the flexibility coefficient of dam body and the maximum dam height, and material property is embodied by the elastic modulus of dam. On the basis of analyzing the correlation between dam deformation and resistance factors, the game model of safety monitoring for arch dam deformation is put forward.
Gravity dam is a typical structure that has been frequently used in the fields of water conservancy engineering, and the safety of the structure has received widespread attention recently. Due to earthquakes or other reasons, gravity dams normally have damage such as cracks in practical service. Damage in the structures can alter the structural dynamic behavior and seriously affect structural performance. Maintaining safety and integrity of the gravity dam structures requires a better understanding of dynam... 相似文献
In order to utilize water and hydropower resources in China,multitudes of water projects are established or to be constructed as an integral part of the national economy's infrastructure.Under these circumstances,there are two outstanding problems:1) a mass of existing dams are in danger and 2) in the southwest water-conservancy construction plan,dozens of existing or planned dams are high dams or even super high dams with heights between 200 and 300 m.In accordance with demands of the National Program for ... 相似文献