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Search Results: 1 - 10 of 57805 matches for " FENG Ming-Feng "
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1,4-Dihydroquinoxaline-2,3-dione–5-nitroisophthalic acid–water (1/1/1)
Ming-Feng Wang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811020873
Abstract: The asymmetric unit of the title compound, C8H6N2O2·C8H5NO6·H2O, contains molecules of 1,4-dihydroquinoxaline-2,3-dione, 5-nitroisophthalic acid and a solvent water. In the crystal structure, molecules are linked into a three-dimensional network by intermolecular N—H...O and O—H...O hydrogen bonds.
A High Power-Added-Efficiency 2.5-GHz Class-F Power Amplifier Using 0.5 μm GaN on SiC HEMT Technology  [PDF]
Chia-Han Lin, Hsien-Chin Chiu, Min-Li Chou, Hsiang-Chun Wang, Ming-Feng Huang
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.43011

This paper proposed the high-frequency, multi-harmonic-controlled, Class-F power amplifier (PA) implemented with 0.5 μm GaN Hetrojunction Electron Mobility Transistor (HEMT). For PA design at high frequencies, parasitics of a transistor significantly increase the difficulty of harmonic manipulation, compared to low-frequency cases. To overcome this issue, we propose a novel design methodology based on a band-reject, low-pass, output matching network, which is realized with passive components. This network provides optimal fundamental impedance and allows harmonic control up to the third order to enable an efficient Class-F behavior. The implemented PA exhibits performance at 2.5 GHz with a 50% PAE, 14 dB gain, and 10 W output power.

Imperfect Reworking Process Consideration in Integrated Inventory Model under Permissible Delay in Payments
Ming-Cheng Lo,Ming-Feng Yang
Mathematical Problems in Engineering , 2008, DOI: 10.1155/2008/386252
Abstract: This study develops an improved inventory model to help the enterprises to advance their profit increasing and cost reduction in a single vendor single-buyer environment with general demand curve, adjustable production rate, and imperfect reworking process under permissible delay in payments. For advancing practical use in a real world, we are concerned with the following strategy determining, which includes the buyer's optimal selling price, order quantity, and the number of shipments per production run from the vendor to the buyer. An algorithm and numerical analysis are used to illustrate the solution procedure.
Spinal and Spinel-zirconia Composite Material Prepared at Low Temperature by Al13 as Aluminium Source
ZHANG Zhi-Jie,ZHONG Ming-Feng
无机材料学报 , 2009, DOI: 10.3724/sp.j.1077.2009.00934
Abstract: Spinel and spinel-zirconia composite powder were synthesized by soft chemistry method using £ lO4Al12(OH) 24(H2O) 12£ SUP>7+£¨abbreviated Al13£ as aluminum source. Precursor structure, reaction progress and material microa2structure evolvement were characterized by 27Al NMR, XRD, DSC-TG and FTIR. Spinel precursor was prepared by mixing Al13 solution and magnesium slurry which was obtained by milling the mixture of MgCl2 ¤6H2O and NaOH, and its component included Mg6Al2CO3(OH)16 ¤4H2O and |-Al(OH)3. Spinel is formed from calcination of this spinel precursor at 600 or 1h, and only spinel is formed at even higher temperatures. Spinel-zirconia composite powder precursor is prepared by hydrolysis-precipitation process of Al13, MgCl2 ¤6H2O and ZrOCl2 ¤8H2O solution. Spinel-zirconia composite powder can also be obtained from calcination of the precursor at 600 FTIR spectra of the Al13 powder and spinela2zirconia precursor show that the £ lO6£ absorption band shifts from 608cm-1 to 601cm-1 and £ lO4£ from 761cm-1 to 723cm-1.The result shows that Al13 has obvious advantage in synthesis of spinel and spinela2zirconia composite powders at low temperature because Al-O-Mg bond can be formed easily in precursors.
Intermediate-pressure phases of cerium studied by an LDA + Gutzwiller method
Ming-Feng Tian,Xiaoyu Deng,Zhong Fang,Xi Dai
Physics , 2011, DOI: 10.1103/PhysRevB.84.205124
Abstract: The thermodynamic stable phase of cerium metal in the intermediate pressure regime (5.0--13.0 GPa) is studied in detail by the newly developed local-density approximation (LDA)+ Gutzwiller method, which can include the strong correlation effect among the 4\textit{f} electrons in cerium metal properly. Our numerical results show that the $\alpha"$ phase, which has the distorted body-centered-tetragonal structure, is the thermodynamic stable phase in the intermediate pressure regime and all the other phases including the $\alpha'$ phase ($\alpha$-U structure), $\alpha$ phase (fcc structure), and bct phases are either metastable or unstable. Our results are quite consistent with the most recent experimental data.
The Toxicological Effects of Cr6+ on Chlorella Vulgaris, Scenedesmus Obliquus and Microcystis Aeruginosa at Different pH Values

ZHAO Na,ZHU Lin,FENG Ming-feng,

生态毒理学报 , 2010,
Abstract: 目前我国水质量生态基准的研究较为零星、分散. 研究了不同pH条件下Cr6+对3种藻的毒性效应,以期为我国水生态基准的科学制定以及基准的相关研究工作提供参考. 选取小球藻、斜生栅藻和铜绿微囊藻3种典型的藻种,在pH为7.0,8.0和9.0三个条件下,依据OECD-201藻类生长抑制实验指南,以72h藻生物量为测试终点,计算3种藻的比生长率,以及Cr6+对3种藻产生毒性效应的NOEC、LOEC、EC10和EC20值. 结果表明,在本实验条件下,在不同pH条件下藻种生长不同,小球藻的最适pH值为7.0,斜生栅藻和铜绿微囊藻的最适pH值为9.0;在不同pH条件下,Cr6+对小球藻、斜生栅藻和铜绿微囊藻的毒性作用不同,Cr6+对小球藻在pH=7.0时毒性最小,对斜生栅藻和铜绿微囊藻在pH=9.0时的毒性最小. 在藻最适生长的pH条件下,Cr6+的毒性可以达到最小程度;铜绿微囊藻对Cr6+比斜生栅藻和小球藻更加敏感.
A complementary method for detecting qi vacuity
Ming-Feng Chen, Hsi-Ming Yu, Shu-Fang Li, Ta-Jung You
BMC Complementary and Alternative Medicine , 2009, DOI: 10.1186/1472-6882-9-12
Abstract: This study used the ARDK to measure skin conductance on 193 patients with QV and 89 sex- and age-matched healthy controls to investigate whether the device is useful in detecting QV. Patients diagnosed with QV have three or more of five symptoms or signs; symptom severity is measured on 5 levels and scored from 0 to 4 points. We compared the difference in the mean ARDK values between patients with QV and healthy controls, and further used linear regression analysis to investigate the correlation between the mean ARDK values and QV scores in patients diagnosed with QV.The mean ARDK values in patients with QV (30.2 ± 16.8 μA) are significantly lower than those of healthy controls (37.7 ± 10.8 μA; P < 0.001). A negative correlation was found between the mean ARDK values and QV scores (r coefficient = -0.61; P < 0.001). After adjusting for age, the decreased mean ARDK values in patients with QV showed a significant correlation with the QV scores.These results suggest that the mean ARDK values reflect the severity of QV in patients diagnosed with the disorder. They also suggest that the bioenergy level of the human body can be measured by skin conductance. ARDK is a safe and effective complementary method for detecting and diagnosing QV.Qi vacuity (QV) is a syndrome defined by traditional Chinese medicine as a loss of energy in the human body. Patients with QV commonly have symptoms of tiredness, general malaise, and loss of the ability to speak loudly or for long periods of time. Some patients with QV break abruptly into spontaneous sweating during movement. Practitioners of traditional Chinese medicine usually make the diagnosis of QV on the basis of subjective observation of the patient's symptoms and signs. A gold standard for diagnosing QV is not yet available, however. A professional committee formed by the Society of Integrated Chinese and Western Medicine for the study of qi vacuity patterns and age-related disease proposed a set of criteria for diagnosing QV [1]
Spinal and Spinel-zirconia Composite Material Prepared at Low Temperature by Al13 as Aluminium Source

ZHANG Zhi-Jie,ZHONG Ming-Feng,

无机材料学报 , 2009,
Abstract: 以[AlO4Al12(OH)24(H2O) 12]7+(简写为Al13)溶液为铝源, 采取湿化学的方法合成尖晶石及尖晶石氧化锆复合粉体. 采用27Al NMR、DSC-TG、XRD和FTIR等研究前驱体结构、反应过程及微结构演变. 将氯化镁、氢氧化钠混合研磨后加入Al13溶液中, 得到由Mg6Al2CO3(OH)16·4H2O 和 β-Al(OH)3组成的前驱体, 经过600℃煅烧形成尖晶石, 更高温煅烧产物仍为尖晶石单相. 以Al13、MgCl2·6H2O和ZrOCl2·8H2O为原料制备的前驱体经600℃煅烧, 同样获得尖晶石和四方相氧化锆. Al13粉末和尖晶石氧化锆复合粉体的FTIR谱显示, 归属于[AlO6]的吸收谱带由608cm-1移至 601cm-1, 归属于 [AlO4] 的吸收谱带由761cm-1 移至 723cm-1. 前驱体中形成的AlOMg键合是以Al13为铝源合成尖晶石和尖晶石氧化锆复合粉体具有低温合成的主要原因.
Identification of Regulatory Sequence of lip Genes of Phanerochaete chrysosporium under Lignin-degradation

JIANG Ming-feng,ZHANG Yi-zheng,

遗传 , 2005,
Abstract: 用DNA-蛋白质体外结合实验和凝胶迁移率变动分析技术筛选黄孢原毛平革菌(Phaneroohaete chrysosporium)木质素过氧化物酶基因lipA、lipC、lipF的5′-端调控区内能与该菌在木质素降解条件下形成的蛋白特异结合的顺式作用元件.结果表明,来自lipC、lipF基因的5′-端片段LG2P3(396 bp)和LG6S1-2(738bp)能特异结合培养于Kirk低氮培养基中的菌丝体蛋白;而来自于lipF基因的5′-端的LG6S2(226 bp)DNA片段能特异结合培养于天然冷杉木片中的菌丝体蛋白.对这些片段的DNA序列分析表明,它们均存在各种顺式作用元件,由此推测它们可能是被一些木质素过氧化物酶基因转录调控相关的蛋白质所结合的序列.
RAPD Polymorphism of Polygonum capitatum Population from Guizhou and Sichuan
贵州和四川头花蓼居群的 RAPD 多态性研究

DU Ming-Feng,CHEN Qing-Fu,

植物科学学报 , 2009,
Abstract: 运用随机扩增多态DNA(RAPD)方法研究了来自贵州、四川10个头花蓼(Polygonum capitatum)居群的遗传多样性.结果表明:由6个引物扩增得到74条带.其中,有11条RAPD谱带是所有材料共有的.各居群间相似系数介于0.622~0.892之间.UPGMA法聚类分析表明,供试材料可分为2类,类Ⅰ包含四川都江堰和贵州施秉居群,具有独特的一条带S53-650,并缺少其它居群共同具有的两条带S53-400和S67-790.类Ⅱ有四川马尔康和贵州的其它7个居群,它们彼此间遗传变异较小.
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