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Search Results: 1 - 10 of 129202 matches for " Min-Hua Ho;Po-Fan Chen "
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Suspended Substrate Stripline Bandpass Filters with Source-Load Coupling Structure Using Lumped and Full-Wave Mixed Approach
Min-Hua Ho;Po-Fan Chen
PIER , 2012, DOI: 10.2528/PIER11102502
Abstract: This paper presents the design of two suspended substrate stripline (SSS) bandpass filters (BPFs), both with a source-load coupling structure embedded to create a transmission zero (TZ) near each side of the passband edges. For the first BPF, the physical circuit layout is proposed first and followed by the establishment of an equivalent LC circuit. The optimization of element values of the LC circuit using a circuit-level simulator leads to quick adjustment of the structural parameters of the physical circuit layout with the aid of a full-wave simulator. For the second BPF, the ingenious equivalent LC circuit modified from that of the first one is proposed for bandwidth enhancement, which is achieved by exciting two extra loaded resonances in the passband. With the element values of the LC circuit optimized, proper reshaping the physical circuit layout from that of the first BPF is easily accomplished. The presented lumped and full-wave mixed approach is very efficient in that the circuit-level simulator is used to the largest extent and the time-consuming full-wave simulator is employed only at the later stage of the design. Experiments are conducted to verify the design of the two SSS BPFs and agreements are observed between the measured and simulated data.
Quasi-Lumped Design of Bandpass Filter Using Combined CPW and Microstrip
Mingchih Chen;Yi-Chiao Lin;Min-Hua Ho
PIER Letters , 2009, DOI: 10.2528/PIERL09042201
Abstract: A bandpass filter (BPF) using CPW combined with microstrip is proposed. The target BPF is composed of two element filters built from combined CPW and microstrip structure. The design of element filter is based on the lumped elements approach with each circuit component built from a CPW or microstrip. In the circuit model, transmission zeros are created by the passband edges to enhance the signal selectivity. The element filter's characteristics are analyzed by the lumped L-C circuit model. Experiment is conducted, and a good agreement is observed between the measurement and simulation.
Design of High Order Suspended Stripline Bandpass Filter with Miniaturization
Mingchih Chen;Chang-You Jiang;Wei-Qin Xu;Min-Hua Ho
PIER Letters , 2009, DOI: 10.2528/PIERL09031601
Abstract: A quasi-lumped design of a suspended stripline (SSL) bandpass filter (BPF) exhibiting high signal selectivity is proposed. In the circuit, transmission zeros were implanted to enhance the stopband signal rejection. A sample BPF having an operation band of 6.77--7.33\,GHz was fabricated and measured for performance verification of the proposed design.
Does Salary Discrimination by Nationality Exist? The Case of Nippon Professional Baseball League  [PDF]
Wen-Jhan Jane, Sheng-Tung Chen, Min-Hua Kuo
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.42012
Abstract:

This article focuses on the issue of nationality as related to salary discrimination in the Nippon Professional Baseball (NPB) league. Salary data for 663 players during the period from 2000 to 2008 was collected, and Quantile Regression (QR) was employed to investigate the nationality discrimination in salary. The main finding indicates that, on average, international players were paid 54.7% - 57.3% more than domestic players ceteris paribus. QR results show that the positive effect of nationality on salary is larger for players with relatively higher salaries. The finding indicates that an international player’s salary premium increases with salary.

Analysis of Renewable Energy Utilization Potential in Buildings of China  [PDF]
Min-hua Cai, Lan Tang
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B057
Abstract: As a country of great population, China has increasing building energy consumption continuously. It not only threatens the lack of total energy but also hardens the progress of protecting environment. Therefore, it forces the country to accelerate finding substitution application of conventional energy in building, renewable energy building utilization. In base of 2010, this study explores the potential of the renewable energy building utilization by using energy consumption analysis until 2030 and predicts annual alternative quantity of renewable energy in different situations.
Efficient Asymmetric Reduction of 4-(Trimethylsilyl)-3-Butyn-2-One by Candida parapsilosis Cells in an Ionic Liquid-Containing System
Bo-Bo Zhang, Wen-Yong Lou, Wen-Jing Chen, Min-Hua Zong
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0037641
Abstract: Hydrophilic ionic liquids (ILs) were employed as green solvents to construct an IL-containing co-solvent system for improving the asymmetric reduction of 4-(trimethylsilyl)-3-butyn-2-one by immobilized Candida parapsilosis cells. Among 14 hydrophilic ILs examined, 1-(2′-hydroxyl)ethyl-3-methylimidazolium nitrate (C2OHMIM·NO3) was considered as the most suitable IL for the bioreduction with the fastest initial reaction rate, the highest yield and the highest product e.e., which may be due to the good biocompatibility with the cells. For a better understanding of the bioreduction performed in the C2OHMIM·NO3-containing co-solvent system, the effects of several crucial variables were systematically investigated. The optimal C2OHMIM·NO3 content, substrate concentration, buffer pH, co-substrate concentration and temperature were 10% (v/v), 3.0 mmol/L, 5.0, 98.1 mmol/L and 30°C, respectively. Under the optimal conditions, the initial reaction rate, the maximum yield and the product e.e. were 17.3 μmol/h gcell, 95.2% and >99.9%, respectively, which are much better than the corresponding results previously reported. Moreover, the immobilized cells remained more than 83% of their initial activity even after being used repeatedly for 10 batches in the C2OHMIM·NO3-containing system, exhibiting excellent operational stability.
Optimization of culture conditions to produce high yields of active Acetobacter sp. CCTCC M209061 cells for anti-Prelog reduction of prochiral ketones
Xiao-Hong Chen, Wen-Yong Lou, Min-Hua Zong, Thomas J Smith
BMC Biotechnology , 2011, DOI: 10.1186/1472-6750-11-110
Abstract: By using a one-at-a-time method and a central composite rotatable design (CCRD), the optimal medium and culture conditions were found to be as follows: glucose 8.26 g/L, fructose 2.50 g/L, soy peptone 83.92 g/L, MnSO4·H2O 0.088 g/L, pH 5.70, 30°C and 10% (v/v) inoculum. Under the above-mentioned conditions, the biomass after 30 h cultivation reached 1.10 ± 0.03 g/L, which was 9.5-fold higher than that obtained with basic medium. Also, the reduction activity towards 4'-chloroacetophenone was markedly enhanced to 39.49 ± 0.96 μmol/min/g from 29.34 ± 0.65 μmol/min/g, with the product e.e. being above 99%. Comparable improvements were also seen with the enantioselective bioreduction of 4-(trimethylsilyl)-3-butyn-2-one to the key pharmaceutical precursor (R) - 4-(trimethylsilyl)-3-butyn-2-ol.The biomass and reduction activity of Acetobacter sp. CCTCC M209061 can be greatly enhanced through the optimization strategy. This facilitates use of the strain in the anti-Prelog stereoselective reduction of prochiral ketones to enantiopure chiral alcohols as building blocks for many industries.Acetobacter is a genus of acetic acid bacteria characterized by the ability to convert ethanol to acetic acid in the presence of oxygen. Acetobacter sp. is widely used in various fields of biotechnology [1]. The longest-established applications of this genus are the strains used for producing vinegar by oxidation of ethanol to acetic acid [2]. In addition, bacterial cellulose produced by Acetobacter xylinum has attracted attention because of its unique physical and mechanical properties such as its existence as pure cellulose aggregate, high crystallinity, high biocompatibility, and hence its promising properties for application in composite membranes [3], medical materials [4], electronic paper [5] and fuel cells [6]. Strains of Acetobacter have also proven to be efficient biocatalysts for the enantioselective oxidation of various alcohols to yield optically pure carboxylic acids. For examp
Molecular dynamics simulation of isothermal crystallization dynamics in Cu nanocluster
分子动力学模拟尺寸对纳米Cu颗粒等温晶化过程的影响

Chen Qing,Sun Min-Hua,
陈青
,孙民华

物理学报 , 2013,
Abstract: We investigate the isothermal crystallizations of nanoparticles composed, respectively, of 4000 Cu atoms (Cu4000) and 13500 Cu atoms (Cu13500), and bulk Cu according to on embedded atom model, using molecular dynamics simulations. We note that different sizes of Cu nanoparticles display multistep crystallization at low temperature, and their crystallization time distribution is wider than at high temperature, shown by analyzing the structural and dynamic properties of isothermal crystallization. Moreover, the size of particle plays an important role in the crystallization process. The larger the size, the longer the crystallization time is. However, we find that there is a critical size rc. The crystallization time increases with particle size increasing when the size is less than rc. On the contrary, when the size is more than rc, the crystallization time decreases with particle size increasing.
Application value of contrast enhanced ultrasound in radiofrequency ablation of hepatocellular carcinoma
超声造影对射频消融治疗肝癌的应用价值

CHEN Min-hua,YANG Wei,
陈敏华
,杨薇

中华医学超声杂志(电子版) , 2010,
Abstract: 超声造影(contrast enhanced ultrasound,CEUS)对肝脏微小肿瘤的灵敏检出及定性诊断已为大量临床应用所证实1-5]。2004年Solbiati等6]报道CEUS在射频消融(radiofrequency ablation,RFA)前、RFA中、RFA后的应用,提示CEUS可有效引导RFA治疗和评价疗效;结果显示,随着CEUS的广泛应用,RFA局部复发率由16.1%
Adjuvant percutaneous radiofrequency ablation of feeding artery of hepatocellular carcinoma before treatment
Yi-Bin Hou, Min-Hua Chen, Kun Yan, Jin-Yu Wu, Wei Yang
World Journal of Gastroenterology , 2009,
Abstract: AIM: To evaluate the feasibility and efficacy of percutaneous radiofrequency ablation (RFA) of the feeding artery of hepatocellular carcinoma (HCC) in reducing the blood-flow-induced heat-sink effect of RFA.METHODS: A total of 154 HCC patients with 177 pathologically confirmed hypervascular lesions participated in the study and were randomly assigned into two groups. Seventy-one patients with 75 HCCs (average tumor size, 4.3 ± 1.1 cm) were included in group A, in which the feeding artery of HCC was identified by color Doppler flow imaging, and were ablated with multiple small overlapping RFA foci [percutaneous ablation of feeding artery (PAA)] before routine RFA treatment of the tumor. Eighty-three patients with 102 HCC (average tumor size, 4.1 ± 1.0 cm) were included in group B, in which the tumors were treated routinely with RFA. Contrast-enhanced computed tomography was used as post-RFA imaging, when patients were followed-up for 1, 3 and 6 mo.RESULTS: In group A, feeding arteries were blocked in 66 (88%) HCC lesions, and the size of arteries decreased in nine (12%). The average number of punctures per HCC was 2.76 ± 1.12 in group A, and 3.36 ± 1.60 in group B (P = 0.01). The tumor necrosis rate at 1 mo post-RFA was 90.67% (68/75 lesions) in group A and 90.20% (92/102 lesions) in group B. HCC recurrence rate at 6 mo post-RFA was 17.33% (13/75) in group A and 31.37% (32/102) in group B (P = 0.04).CONCLUSION: PAA blocked effectively the feeding artery of HCC. Combination of PAA and RFA significantly decreased post-RFA recurrence and provided an alternative treatment for hypervascular HCC.
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