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排序方式: 共有45条查询结果,搜索用时 15 毫秒
1.
首先简要介绍了集群技术和路由器集群方案,重点说明了其核心——交换网络的结构及其原理,最后对该方案的优点进行了归纳、总结。 相似文献
2.
通过对杜邦膜NX2002TX和旭硝子公司的F-893膜在第1年应用中运行数据的比较。证明在使用第1年内,NX2002TX膜的性能高于F-893膜。 相似文献
3.
Effect of Ionic Liquids on Surface and Aggregation Properties of Non-ionic Surfactant Triton™ X-100 in Aqueous Media 下载免费PDF全文
The effect of the hydrophilic ionic liquids (ILs) 1-butyl-2,3-dimethylimidazolium bromide [bdmim][Br] and 1-hexyl-2,3-dimethylimidazolium bromide [hdmim][Br] on the aggregation and surface active behaviour of the non-ionic surfactant Triton? X-100 (TX-100) was studied in aqueous media. Several aggregation properties of TX-100 + IL/water systems, such as critical micelle concentration (CMC), surface active parameters, aggregation number (N agg) and aggregate size, were determined by surface tension, fluorescence and dynamic light scattering (DLS) techniques. It was found that the average micellar size and aggregation number decrease, whereas the CMC increases with increasing concentration of ILs. Interestingly, the CMC value of TX-100 is reduced slightly below 0.5 wt% of both the ILs in the medium. At higher wt% of IL in the system the CMC increases. It was demonstrated that ILs [bdmim][Br] and [hdmim][Br] can be judiciously used at different wt% for modifying the physico-chemical properties of TX-100. 相似文献
4.
《International Journal of Hydrogen Energy》2022,47(48):20973-20986
Inkjet printing is a versatile, contactless and accurate material deposition technology. The present work is focused on developing innovative strategies for inkjet printing of Catalyst-Coated Membranes (CCM) by performing Additive Manufacturing (AM) applied to Polymer Electrolyte Membrane Fuel Cells (PEMFC), without resorting to intermediate substrates. Three different approaches for AM are presented and discussed: a) inkjet-printing of the membrane ionomer layer and the top catalyst layer; b) inkjet-printing of both catalyst layers onto a membrane; c) inkjet-printing of the ionomer layer as well as the catalyst layers onto the reinforcement layer of the membrane. The produced catalyst and membrane layers were characterized and proved uniform in terms of catalyst loading (0.2–0.4 and 0.08 mgPt cm?2 for cathode and anode, respectively), ionomer distribution and thickness homogeneity (4 μm for catalyst layers). The fully inkjet-printed CCM outperformed conventionally made assemblies in electrochemical-performance testing, even reaching 15% higher power density. 相似文献
5.
The Integrated Computer Aided Manufacturing (ICAM) program of the U.S. Air Force identified a need to better communicate and analyze manufacturing for the people involved in improving productivity. To satisfy that need, the ICAM program developed the IDEF (ICAM Definition) method to address particular characteristics of manufacturing. This IDEF method is equally applicable in analyzing other types of organizations. IDEF comprises three modeling methodologies: function model methodology (IDEF0), information model methodology (IDEF1) and dynamics model methodology (IDEF2). This paper reports on the Information model methodology only. This methodology is used to construct an information model that helps in understanding the structure of information needed to support the functions of an organization. 相似文献
6.
A general computational strategy for the use of the formal solutions obtained in Part I of this paper is presented, and the numerical implementation of this strategy is described in detail for the right circular cylinder. Certain subtleties of the computational procedure are emphasized in order to facilitate similar numerical work for other geometries. Detailed numerical results are presented for a range of physically interesting but previously inaccessible parameter values. Limiting cases of our solution are shown to be in good agreement with the results of simpler analyses.The numerical solutions demonstrate that our techniques combine the classical advantages of eigenfunction expansions with good convergence properties at zero time and minimal computational overhead. In addition, our method is seen to be most efficient in those regimes where other theoretical treatments are unavailable. They thus provide computational and conceptual advantages over competing methods. 相似文献
7.
F. Zhou T.-C. Kuo S.H. Huang H.-C. Zhang 《The International Journal of Advanced Manufacturing Technology》2002,19(2):88-96
Currently, most CAD systems, even the feature-based design systems which were developed for CAPP, cannot provide exact information
about an object (e.g. dimensions and tolerances). Some feature-based design systems can provide product data directly or indirectly;
however, most CAPP systems still do not have an interface with CAD systems. The product data required by CAPP systems usually
has a specific format which is unique to the system. In a CAPP system, it is essential for set-up planning to ensure the precision
of the machining processes. Therefore, it is necessary to develop an interface with CAD models, so that the part data file
can be obtained directly from the CAD representation. This paper proposes an approach for integrating the set-up planning
system with a feature-based CAD system. By using an object-oriented approach – Product Data Translator (PDT), the computer-automated
extraction of geometry and complete tolerance information was achieved; and the automated generation of the tool approach
direction was developed.
RID="
ID=" <E5>Correspondence and offprint requests to</E5>: H.-C. Zhang, Department of Industrial Engineering, Texas Tech University,
Lubbock, TX 79409–3061, USA. E-mail: hzhang@coe.ttu.edu 相似文献
8.
9.
分析了TX6113C床身、立柱变形缺陷产生的原因,结果表明:砂箱的强度和刚度不够是造成变形缺陷的主要原因.通过设计新卡具与现有的砂箱共同使用,铸造缺陷得以解决. 相似文献
10.
基于RX5000/TX5000的无线收发电路 总被引:3,自引:0,他引:3
RX5000和TX5000分别是RFMicro Devices公司专为小范围单向无线通信设计生产的接收器和发射器芯片。它们体积小,功耗低,价格便宜,而且性能稳定,使用方便。文中介绍了RX5000、TX5000的特点与功能,给出了以这两种器件为核心设计的无线收发电路,并对其在足球机器人无线通信系统中的应用进行了说明。 相似文献