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Search Results: 1 - 10 of 6351 matches for " Tong Feiming "
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Yuan Haoxin,Tong Feiming,Tang Dingyuan,

红外与毫米波学报 , 1992,
Abstract: Hg_(1-x)Cd_xTe ion-implanted N~+-P gate-controlled photodiodes are fabricated.Measurements show that the P-N junction characteristics are limited seriously by surface channel leakage current due to strong inversion of P-side surface. A theoretical analysis about this leakage mechanism is carried out in detail. By taking into account the unique features of narrow band-gap Hg_(1-x)Cd_xTe, forward and reverse I-V characteristics and the temperature dependence of R_0A product determined by surface channel current are calculated as a function of the gate bias. A qualitative agreement between experimental and the-oretical results is obtained.
Revelation from Open Access Publication to Development of Chinese Sci-tech Journals

CAI FeiMing,

中国科技期刊研究 , 2007,
Abstract: 开放存取是21世纪在西方发达国家兴起的一种科技文献出版模式。它的理论与实践对西方科技期刊的商业化运作模式提出了质疑和挑战,为我们如何把中国科技期刊做强做大提供了可资借鉴的思路。
Self-Assembled BaTiO3-MnZnFe2O4 Nanocomposite Films
Guo Yu,Feiming Bai,Huaiwu Zhang
Advances in Materials Science and Engineering , 2012, DOI: 10.1155/2012/109856
Abstract: Self-assembled nanocomposite BaTiO3-Mn0.4Zn0.87Fe2O4 magnetodielectric films have been grown on (001)-oriented SrTiO3 substrates by a pulsed laser deposition method. High resolution X-ray diffraction shows that both BaTiO3 and MnZn-ferrite phases are epitaxial along the out-of-plane direction with a 0–3 composite structure in spite of very large lattice mismatch. The magnetic, ferroelectric, and dielectric properties of the nanocomposite films are reported. A saturated magnetization of 330?emu/cc and double remanent polarization of 40?μC/cm2 were obtained. Structural and compositional factors limiting the effective permeability and the dielectric constant will be discussed. 1. Introduction Ferromagnetic and ferroelectric materials individually provide magnetic and electrical tunability for adaptive RF and microwave devices, [1, 2]. Recently, a promising approach for tunable microwave devices, which combines the advantages of ferrite and ferroelectric devices, has been developed [3–5]. The technique involves the excitations of hybrid-spin-electromagnetic waves in ferrite-ferroelectric-layered structures. A number of bilayer-structured films, including Y3Fe5O12/Ba0.5Sr0.5TiO3 (YIG/BST), Ba0.5Sr0.5TiO3/BaFe12O19 (BST/BaM), YIG/Pb(ZrTi)O3 (PZT), NiFe2O4/BST, and PZT/NiFe2O4 have been fabricated and investigated based on this mechanism [6–12]. Another approach of utilizing epitaxial films with ferromagnetic nanostructure embedded in ferroelectric matrix may have even superior properties. First, the low thickness of nanocomposite films can push the dimensional resonance to much higher frequency, therefore greatly expanding the working frequency of ferrite. Secondly, the ferroelectric phase has an enhanced c/a ratio due to the constraint from substrate and therefore; enhanced dielectric constant can be achieved [13]. Finally, the effective resistance of nanocomposite films is several magnitudes higher than bulk ferrite, and therefore a low eddy-current loss and a simultaneously high initial permeability are expected. The growth of such nanocomposite films has been demonstrated in BaTiO3-CoFe2O4, [14] BiFeO3-CoFe2O4 [15], BiFeO3-NiFe2O4 [16]; and other systems grown on SrTiO3 substrates. In current work, our attention was given to BaTiO3-(MnZn)Fe2O4 (BTO-MZF) system. MnZn-ferrite has simultaneous giant capacitance (dielectric constant ~105) and a rather large static permeability referred to as giant permeability [17]. However, due to its low electrical resistivity and the dimensional resonance effect, the working frequency of bulk MZF is lower than 2?MHz [18].
Controllability of ferromagnetism in graphene
Tianxing Ma,Feiming Hu,Zhongbing Huang,Hai-Qing Lin
Physics , 2009, DOI: 10.1063/1.3485059
Abstract: We systematically study magnetic correlations in graphene within Hubbard model on a honeycomb lattice by using quantum Monte Carlo simulations. In the filling region below the Van Hove singularity, the system shows a short-range ferromagnetic correlation, which is slightly strengthened by the on-site Coulomb interaction and markedly by the next-nearest-neighbor hopping integral. The ferromagnetic properties depend on the electron filling strongly, which may be manipulated by the electric gate. Due to its resultant controllability of ferromagnetism, graphene-based samples may facilitate the development of many applications.
Pairing in graphene: A quantum Monte Carlo study
Tianxing Ma,Zhongbing Huang,Feiming Hu,Hai-Qing Lin
Physics , 2011, DOI: 10.1103/PhysRevB.84.121410
Abstract: To address the issue of electron correlation driven superconductivity in graphene, we perform a systematic quantum Monte Carlo study of the pairing correlation in the t-U-V Hubbard model on a honeycomb lattice. For V=0 and close to half filling, we find that pairing with d+id symmetry dominates pairing with extended-s symmetry. However, as the system size or the on-site Coulomb interaction increases, the long-range part of the d+id pairing correlation decreases and tends to vanish in the thermodynamic limit. An inclusion of nearest-neighbor interaction V, either repulsive or attractive, has a small effect on the extended-s pairing correlation, but strongly suppresses the d+id pairing correlation.
Opening Band Gap without Breaking Lattice Symmetry: A New Route toward Robust Graphene-Based Nanoelectronics
Liangzhi Kou,Feiming Hu,Binghai Yan,Thomas Frauenheim,Changfeng Chen
Physics , 2014, DOI: 10.1039/C4NR01102C
Abstract: Developing graphene-based nanoelectronics hinges on opening a band gap in the electronic structure of graphene, which is commonly achieved by breaking the inversion symmetry of the graphene lattice via an electric field (gate bias) or asymmetric doping of graphene layers. Here we introduce a new design strategy that places a bilayer graphene sheet sandwiched between two cladding layers of materials that possess strong spin-orbit coupling (e.g., Bi2Te3). Our ab initio and tight-binding calculations show that proximity enhanced spin-orbit coupling effect opens a large (44 meV) band gap in bilayer graphene without breaking its lattice symmetry, and the band gap can be effectively tuned by interlayer stacking pattern and significantly enhanced by interlayer compression. The feasibility of this quantum-well structure is demonstrated by recent experimental realization of high-quality heterojunctions between graphene and Bi2Te3, and this design also conforms to existing fabrication techniques in the semiconductor industry. The proposed quantum-well structure is expected to be especially robust since it does not require an external power supply to open and maintain a band gap, and the cladding layers provide protection against environmental degradation of the graphene layer in its device applications.
Magnetoelectric surface acoustic wave resonator with ultrahigh magnetic field sensitivity
Liang Huang,Dandan Wen,Zhiyong Zhong,Huaiwu Zhang,Feiming Bai
Physics , 2014,
Abstract: A magnetoelectric surface acoustic wave (MESAW) type device based on piezoelectric/magnetostrictive heterostructure was proposed to use as weak magnetic field sensor. Unlike conventional magnetoelectric bulk laminates or film stacks collecting magnetic field induced electrical charge, the MESAW detects the shift of the center frequency, which highly depends on the magnetic field due to the giant delta E effect and the phase velocity dispersion. The magnetic field sensitivity can reach 10^(-11) Tesla in consideration of 100 Hz frequency accuracy. Additionally, the unique working mechanism of MESAW allows a broadband detection of weak magnetic field even with no bias magnetic field.
Exploration for matter stability & the material basis and mechanism for the interaction of light, electricity and magnetic  [PDF]
Zhengrong Tong
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.43028
Abstract: This paper is about the theory of “basic gravitinoes” (in early papers, it was referred to WG) in the material world, which make up the “dark matter” and the elementary particles as well. The strong interaction is generated by the Pressure Effect, which is resulted in the accumulation of the overall gravitation from all the galaxy gravitinoes. The Model for Stable-state Particle Basic Body indicates three stable states which correspond to protons, electrons and neutrons respectively and have been proven by all the particle collision experiments. It’s the root cause that only the short-lived particles resulted in the collisions. The study is supported by all experiments of light propagation, especially the wave-particle duality, and tries to make the theoretical interpretation for three laws of electromagnetic experiment so that the Maxwell’s field equations are derived ultimately and theoretically.
Valuation Adjustment Mechanism in M & A: Application, Analysis and Enlightenment  [PDF]
Tong Zhou
American Journal of Industrial and Business Management (AJIBM) , 2016, DOI: 10.4236/ajibm.2016.65051
Abstract: As a creative form of contract, the valuation adjustment mechanism is applied in M & A for many companies. Measures for Administration of Material Assets Reorganization of Listed Companies, which were adopted on November, 2014, required that listed companies must sign VAM with counterparty when pricing the assets. In M & A, the use of VAM can improve the efficiency and reduce the risk of failure. Based on the case of BlueFocus merged Accurate Sun, this paper thoroughly analyzes the structural design of VAM and its effects. Some suggestions are proposed in this paper in order to explain how to use VAM successfully.
Identification of Rice Transcription Factors Associated with Drought Tolerance Using the Ecotilling Method
Shunwu Yu, Fengxian Liao, Feiming Wang, Weiwei Wen, Jiajia Li, Hanwei Mei, Lijun Luo
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0030765
Abstract: The drought tolerance (DT) of plants is a complex quantitative trait. Under natural and artificial selection, drought tolerance represents the crop survival ability and production capacity under drought conditions (Luo, 2010). To understand the regulation mechanism of varied drought tolerance among rice genotypes, 95 diverse rice landraces or varieties were evaluated within a field screen facility based on the ‘line–source soil moisture gradient’, and their resistance varied from extremely resistant to sensitive. The method of Ecotype Targeting Induced Local Lesions in Genomes (Ecotilling) was used to analyze the diversity in the promoters of 24 transcription factor families. The bands separated by electrophoresis using Ecotilling were converted into molecular markers. STRUCTURE analysis revealed a value of K = 2, namely, the population with two subgroups (i.e., indica and japonica), which coincided very well with the UPGMA clusters (NTSYS-pc software) using distance-based analysis and InDel markers. Then the association analysis between the promoter diversity of these transcription factors and the DT index/level of each variety was performed. The results showed that three genes were associated with the DT index and that five genes were associated with the DT level. The sequences of these associated genes are complex and variable, especially at approximately 1000 bp upstream of the transcription initiation sites. The study illuminated that association analysis aimed at Ecotilling diversity of natural groups could facilitate the isolation of rice genes related to complex quantitative traits.
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