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Search Results: 1 - 10 of 45785 matches for " Man Xu "
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Design of Radome with Different Structures Based on Transformation Optics  [PDF]
Guanxia Yu, Lijuan Xia, Baibing Xu, Man Zhou
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.311070
Abstract: Basing on the transformation optics, we propose a kind of transformation method of compressing or stretching. With the method, we propose a design of transparent radome for different structures. The electromagnetic (EM) waves inside or outside the radome can transmit through the structure without any reflection. Numerical simulations confirm the function of the radome structures.
Diurnal Effects on Chinese Wild Ledum palustre L. Essential Oil Yields and Composition  [PDF]
Liangliang Zhang, Hongxiao Wang, Yongmei Wang, Man Xu, Xinyu Hu
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2017, DOI: 10.4236/jasmi.2017.72005
Abstract: This study was conducted to evaluate the diurnal effect on essential oil yield and composition of Ledum palustre L. grown in northern Inner Mongolia, China. Essential oil content and composition were determined and compared as a function of different harvesting times viz. 7:00 AM, 11:00 AM, 3:00 PM, 7:00 PM, and 11:00 PM within a day. The essential oil obtained by hydrodistillation was investigated by gas chromatography-mass spectrometry (GC-MS). The yield of essential oil was varied from 1.21% to 1.62%; the maximum oil yield was obtained at 3:00 PM and the minimum at 7:00 PM. Similar to oil yield, qualitative difference in essential oil composition of L. palustre was observed. For the best essential oil yields, L. palustre should be harvested during 11:00 AM to 3:00 PM.
Multiple Ionization Cross Sections of Ne and CO Induced by Very High-q Fast Projectiles (q/v > 1)  [PDF]
Man Zhou, Zhenye Wang, Sufen Li, Peng Xu, Haoxin Zhou
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.611196
Abstract:
In this paper, we extend our previous work of classical over barrier ionization (COBI) model to study the multiple ionization cross section of Ne and CO molecule collided by very high-q fast projectiles(q/v > 1). The model gives similar results to the independent-electron-approximation calculation and is in good agreement with experimental data. The very small computational time required makes it a good candidate for studying the multiple ionization of complex molecules under high linear energy transfers.
Highlighting Regional Characteristics and Setting Correct Orientation to Improve Journal''s International Influence
突出区域特色 找准期刊定位 提高国际影响

XU,Man,
徐曼

中国科技期刊研究 , 2008,
Abstract: 面对科技期刊竞争日益激烈的环境,走自己特色的发展道路,发挥自己的优势和准确定位,在众多的科技期刊中,体现其存在的价值。本文从办刊宗旨、自身定位、学术质量、遴选优秀稿件、栏目设置、编辑队伍建设、扩大发行及国际学术交流、提高期刊影响力等方面论述了《干旱区地理》如何多头并重,用特色意识贯穿编刊的全过程,实现自身的持续发展和创新跨越。
Highlighting Regional Characteristics and Setting Correct Orientation to Improve Journal''s International Influence
突出区域特色 找准期刊定位 提高国际影响

XU,Man,
徐曼

中国科技期刊研究 , 2008,
Abstract: 面对科技期刊竞争日益激烈的环境,走自己特色的发展道路,发挥自己的优势和准确定位,在众多的科技期刊中,体现其存在的价值。本文从办刊宗旨、自身定位、学术质量、遴选优秀稿件、栏目设置、编辑队伍建设、扩大发行及国际学术交流、提高期刊影响力等方面论述了《干旱区地理》如何多头并重,用特色意识贯穿编刊的全过程,实现自身的持续发展和创新跨越。
Numerical Analysis of Vibration Isolation Using Pile Rows against the Vibration due to Moving Loads in a Viscoelastic Medium
Bin Xu,Man-Qing Xu
International Journal of Engineering Mathematics , 2014, DOI: 10.1155/2014/810525
Abstract: A numerical method for evaluating the vertical vibration isolation effect of pile rows embedded in a viscoelastic half space subjected to a moving load is developed in this paper on the basis of the Cole-Cole model and Muki’s method. Based on the proposed method, the influence of various parameters on the vibration isolation effect of pile rows embedded in the viscoelastic half space is investigated numerically. 1. Introduction Vibration induced by railway traffic is a major concern for civil engineers as it causes annoyance to residents or even damage to adjacent structures. Generally, the effects of ground vibrations can be mitigated by two kinds of vibration isolation methods: the active and the passive vibration isolation methods. The active isolation system is often used to reduce the ground vibration near the source. It is usually installed either around the vibration source or at a close distance to the source. The passive isolation system, on the other hand, usually is far away from the source and surrounds the protected structure. Normally, there are two passive vibration isolation methods: the trench (open or infilled) isolation method and the pile (pile rows or sheet piles) isolation method. To date, many studies concerning vibration isolation using trenches or piles have been conducted. For example, Emad and Manolis [1] utilized the boundary element method (BEM) with constant elements to examine the efficiency of vibration reduction by open trench with a rectangular or a circular cross-section. Considering the coupling effects between the soil skeleton and underground water, Cao et al. [2] proposed an analytical model to investigate the screening efficiency of trenches to moving-load induced ground vibrations based on Biot’s dynamic poroelastic theory. Cai et al. [3] investigated the vibration isolation effect of pile rows embedded in a poroelastic medium by using the wave function expansion method. Kattis et al. [4, 5] used 3D BEM to calculate the screening effectiveness of a pile row in the frequency domain. Also, by means of the frequency domain BEM, the screening effectiveness of four types of circular piles in a row against the vibration due to a massless square foundation subjected to a harmonic vertical loading is studied by Tsai et al. [6]. Besides, by means of the fictitious pile method developed by Muki and Sternberg [7] and the direct superposition method, Lu et al. [8, 9] analyzed the vibration isolation effect of pile rows. It is noticed that previous studies concern the vibration isolation modelling in a generalized standard
CORROSION DAMAGE OF SOME CAST SUPERALLOYS EXPOSED TO BURNING NATURAL GAS IN BOILER CHAMBER

Man Yongfa,Liu Jiale,and Xu Yongyan,

金属学报 , 1981,
Abstract:
(E)-2-(4-tert-Butylphenyl)-1-(4-chloro-1-ethyl-3-methyl-1H-pyrazol-5-yl)-2-cyanoethenyl 2,2-dimethylpropanoate
Man Xu,Haibo Yu,Bin Li
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810048087
Abstract: In the title compound, C24H30ClN3O2, the dihedral angle between the aromatic rings is 30.78 (10)°.
Active Dictionary Learning in Sparse Representation Based Classification
Jin Xu,Haibo He,Hong Man
Computer Science , 2014,
Abstract: Sparse representation, which uses dictionary atoms to reconstruct input vectors, has been studied intensively in recent years. A proper dictionary is a key for the success of sparse representation. In this paper, an active dictionary learning (ADL) method is introduced, in which classification error and reconstruction error are considered as the active learning criteria in selection of the atoms for dictionary construction. The learned dictionaries are caculated in sparse representation based classification (SRC). The classification accuracy and reconstruction error are used to evaluate the proposed dictionary learning method. The performance of the proposed dictionary learning method is compared with other methods, including unsupervised dictionary learning and whole-training-data dictionary. The experimental results based on the UCI data sets and face data set demonstrate the efficiency of the proposed method.
Effect of Particle Size and Dispersion on Dielectric Properties in ZnO/Epoxy Resin Composites
Wenhu Yang,Ran Yi,Xu Yang,Man Xu
Transactions on Electrical and Electronic Materials , 2012,
Abstract: In this paper, ZnO-Epoxy nanocomposites (NEP) were prepared and epoxy composites that contain 5 wt% microZnO (MEP) and deliberately not well dispersed nano ZnO (NDNEP) were also prepared for purpose of comparison.The effects of the particle size and dispersion of ZnO on dielectric properties of epoxy resin were chiefly studied.Test results showed that: at a loading of 5 wt%, the three epoxy composites seem to have no significant difference onresistivity compared to epoxy resin; Dielectric constants of all the epoxy composites are also basically the same butthey are bigger compared to that of the pure epoxy resin (unfilled); Dielectric dissipation factors (tanδ) of NDNEP isgreater than that of NEP and MEP. NEP has the minimum dielectric loss factor, whereas dielectric loss factors of thethree epoxy composites are larger than that of the pure epoxy resin. The decreasing order of electrical breakdownstrength for the three epoxy composites and for the pure epoxy resin is as follows: NEP>MEP>NDNEP>EP. Finally,in order to explain the experimental results the aggregation interface phase was proposed. Furthermore, addition ofwell dispersed nano filler has proved to have a positive effect on the improvement of the dielectric properties of epoxyresin.
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