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排序方式: 共有364条查询结果,搜索用时 15 毫秒
1.
Tsung-Nan Kuo Yo-Shen Lin Chi-Hsueh Wang Chun Hsiung Chen 《Microwave and Wireless Components Letters, IEEE》2006,16(2):90-92
In this letter, a compact branch-line coupler is proposed by making good use of the three-dimensional layout capability of the low-temperature co-fired ceramic (LTCC) substrate. This branch-line coupler is accomplished by using lumped-inductors and lumped-capacitors to realize the modified-T equivalent-circuit model for the transmission line so that the circuit size may drastically be reduced. Specifically, a very compact LTCC branch-line coupler with a size of 0.079/spl lambda//spl times/0.0717/spl lambda/ is implemented and carefully examined, where /spl lambda/ is the wavelength of the multilayer structure at the operating frequency f/sub 0/. 相似文献
2.
Hsu‐Wei Fang Hsien‐Chieh Wang Teh‐Hua Tsai Wei‐Bor Tsai Shao‐Yi Hou Hsuan‐Liang Liu Wun‐Hsing Lee Yung‐Chang Lu Chun‐Hsiung Huang 《应用聚合物科学杂志》2008,108(4):2428-2437
Wear of ultrahigh‐molecular‐weight polyethylene (UHMWPE) and wear‐particle‐induced osteolysis and bone resorption are the major factors causing the failure of total joint replacements. It is feasible to improve the lubrication and reduce the wear of artificial joints. We need further understanding of the lubrication mechanism of the synovial fluid. The objective of this study is to evaluate the lubricating ability of three major components in the synovial fluid: albumin, globulin, and phospholipids. An accelerated wear testing procedure in which UHMWPE is rubbed against a microfabricated surface with controlled asperities has been developed to evaluate the lubrication behavior. An analysis of the wear particle dimensions and wear amount of the tests has provided insights for comparing their lubrication performance. It is concluded that the presence of biomolecules at the articulating interface may reduce friction. A higher concentration of a biological lubricant leads to a decrease in the wear particle width. In addition, in combination with the wear results and mechanical analysis, the roles of individual biomolecules contributing to friction and wear at the articulating interface are discussed. These results can help us to identify the role of the biomolecules in the boundary lubrication of artificial joints, and further development of lubricating additives for artificial joints may be feasible. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
3.
Kuo‐Hsiung Wang Tzong‐Ming Wu Yeng‐Fong Shih Chien‐Ming Huang 《Polymer Engineering and Science》2008,48(9):1833-1839
The water bamboo husk is one of major agricultural wastes in Taiwan. In this study, the powder obtained from the water bamboo husk was added to poly(lactic acid) (PLA) to form novel reinforced biodegradable composites. Morphologies, mechanical properties, and heat resistance of these water bamboo powder reinforced composites were investigated. The results indicate that the char yields were increased as plant powder was incorporated to PLA. In addition, the mechanical properties were also enhanced due to the addition of powders. The increments of storage moduli of PLA were about 50–200%. Moreover, the increments of loss moduli of PLA were about 70–200%. On the other hand, the Tg of PLA was slightly decreased by the addition of powder, and this may improve the brittle characteristics of PLA. Furthermore, this type of reinforced PLA would be more environmental friendly than the artificial additive‐reinforced one. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers 相似文献
4.
Faa‐Jeng Lin Jonq‐Chin Hwang Kuang‐Hsiung Tan Zong‐Han Lu Yung‐Ruei Chang 《Asian journal of control》2012,14(3):768-783
An intelligent control for a stand‐alone doubly‐fed induction generator (DFIG) system using a proportional‐integral‐derivative neural network (PIDNN) is proposed in this study. This system can be applied as a stand‐alone power supply system or as the emergency power system when the electricity grid fails for all sub‐synchronous, synchronous, and super‐synchronous conditions. The rotor side converter is controlled using field‐oriented control to produce 3‐phase stator voltages with constant magnitude and frequency at different rotor speeds. Moreover, the grid side converter, which is also controlled using field‐oriented control, is primarily implemented to maintain the magnitude of the DC‐link voltage. Furthermore, the intelligent PIDNN controller is proposed for both the rotor and grid side converters to improve the transient and steady‐state responses of the DFIG system for different operating conditions. Both the network structure and online learning algorithm are introduced in detail. Finally, the feasibility of the proposed control scheme is verified through experimentation. Copyright © 2011 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society 相似文献
5.
An Internet-based graphical programming tool for teaching power system harmonic measurement 总被引:1,自引:0,他引:1
Hsiung Cheng Lin 《Education, IEEE Transactions on》2006,49(3):404-414
Traditional methods to measure power system harmonics employ the power harmonic analyzer or a software package, such as Matlab or others, but they do have certain limitations in the graphical programming environment, applications for remote monitoring and control performance. This paper presents a virtual instrument (VI) that can carry out power system harmonic measurement based on fast Fourier transform (FFT) in remote surveillance capability via the Internet. The strategies and guidelines are also developed to enhance teaching and/or learning the basics of operating Internet-based systems. Critical issues pertaining to engineering education, such as design of course, expected learning outcomes, assessment of student performance, and course evaluation are discussed in detail. 相似文献
6.
This study reports on a new pneumatic micropump integrated with a normally closed valve that is capable of generating a high
pumping rate and a high back pressure. The micropump consists of a sample flow microchannel, three underlying pneumatic air
chambers, resilient polydimethylsiloxane (PDMS) membrane structures and a normally closed valve. The normally closed valve
of the micropump is a PDMS-based floating block structure located inside the sample flow microchannel, which is activated
by hydraulic pressure created by the peristaltic motion of the PDMS membranes. The valve is used to effectively increase pumping
rates and back pressures since it is utilized to prevent backflow. Experimental results indicate that a pumping rate as high
as 900 μL/min at a driving frequency of 90 Hz and at an applied pressure of 20 psi (1.378 × 105 Nt/m2) can be obtained. The back pressure on the micropump can be as high as 85 cm-H2O (8,610.5 Nt/m2) at the same operation conditions. The micropump is fabricated by soft lithography processes and can be easily integrated
with other microfluidic devices. To demonstrate its capability to prevent cross contamination during chemical analysis applications,
two micropumps and a V-shape channel are integrated to perform a titration of two chemical solutions, specifically sodium
hydroxide (NaOH) and benzoic acid (C6H5COOH). Experimental data show that mixing with a pH value ranging from 2.8 to 12.3 can be successfully titrated. The development
of this micropump can be a promising approach for further biomedical and chemical analysis applications. 相似文献
7.
Tah‐Hsiung Chu 《中国工程学刊》2013,36(6):585-591
Abstract The basic principle, methodology and experimental results of the automated microwave diversity imaging system developed in the Electromagnetic Research Laboratory of National Taiwan University are presented. The microwave image formulation is based on Bojarski's identity. In practice, accessing the object backscattering information using the frequency, angular and polarization diversity techniques is conducted by the developed microwave measurement system with major parts including dual polarization antennas, network analyzer and a MicroVax III. It is shown that images of a scale model of the space shuttle reconstructed from the measured data can be identified visually. The implications for high‐resolution microwave imaging radar networks are also discussed. 相似文献
8.
Yun‐Mei Hsiung 《中国工程学刊》2013,36(1):145-154
Abstract In this paper, the procedure of normalizing load‐deflection curves of lateral piles in a homogeneous elasto‐plastic soil is presented. An analytical method using subgrade reactions reveals that the normalized relation of load‐deflection exists for force, moment or combined load. The normalized curves for force and moment load fit very well with the predictions using the equations. For the combined load, the normalized curves are distributed between the force and moment load curves, so it is easy to use interpolation from a family of curves. These normalized curves provide a very convenient way for calculating the pile load or deflection in the design stage. 相似文献
9.
10.
Chung‐Hsiung Li 《中国工程学刊》2013,36(1):119-121
Abstract This study is to discuss the effect of longitudinal heat conduction on a rotary regenerative heat exchanger. An example in Ref. [5] is computed to compare the effect of longitudinal heat conduction. The solutions presented in this study are obtained from the method of numerical analysis as shown in Ref. [3]. 相似文献