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Search Results: 1 - 10 of 24411 matches for " He;Xiaodong "
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Solutions of the (2+1)-dimensional KP, SK and KK equations generated by gauge transformations from non-zero seeds
Jingsong He,Xiaodong Li
Physics , 2008, DOI: 10.1142/S1402925109000170
Abstract: By using gauge transformations, we manage to obtain new solutions of (2+1)-dimensional Kadomtsev-Petviashvili(KP), Kaup-Kuperschmidt(KK) and Sawada-Kotera(SK) equations from non-zero seeds. For each of the preceding equations, a Galilean type transformation between these solutions $u_2$ and the previously known solutions $u_2^{\prime}$ generated from zero seed is given. We present several explicit formulas of the single-soliton solutions for $u_2$ and $u_2^{\prime}$, and further point out the two main differences of them under the same value of parameters, i.e., height and location of peak line, which are demonstrated visibly in three figures.
Interfacial thermal conduction and negative temperature jump in one-dimensional lattices
Xiaodong Cao,Dahai He
Physics , 2015, DOI: 10.1103/PhysRevE.92.032135
Abstract: We study the thermal boundary conduction in one-dimensional harmonic and $\phi^{4}$ lattices, both of which consist of two segments coupled by a harmonic interaction. For the ballistic interfacial heat transport through the harmonic lattice, we use both theoretical calculation and molecular dynamics simulation to study the heat flux and temperature jump at the interface as to gain insights of the Kapitza resistance at the atomic scale. In the weak coupling regime, the heat current is proportional to the square of the coupling strength for the harmonic model as well as anharmonic models. Interestingly, there exists a negative temperature jump between the interfacial particles in particular parameter regimes. A nonlinear response of the boundary temperature jump to the externally applied temperature difference in the $\phi^{4}$ lattice is observed. To understand the anomalous result, we then extend our studies to a model in which the interface is represented by a relatively small segment with gradually changing spring constants, and find that the negative temperature jump still exist. Finally, we show that the local velocity distribution at the interface is so close to the Gaussian distribution that the existence/absence of local equilibrium state seems unable to determine by numerics in this way.
Optical Field Enhancement in Nanoscale Slot Waveguides of Hyperbolic Metamaterials
Yingran He,Sailing He,Xiaodong Yang
Physics , 2012, DOI: 10.1364/OL.37.002907
Abstract: Nanoscale slot waveguides of hyperbolic metamaterials are proposed and demonstrated for achieving large optical field enhancement. The dependence of the enhanced electric field within the air slot on waveguide mode coupling and permittivity tensors of hyperbolic metamaterials is analyzed both numerically and analytically. Optical intensity in the metamaterial slot waveguide can be more than 25 times stronger than that in a conventional silicon slot waveguide, due to tight optical mode confinement enabled by the ultrahigh refractive indices supported in hyperbolic metamaterials. The electric field enhancement effects are also verified with the realistic metal-dielectric multilayer waveguide structure.
Microstructure Evolution of Electron Beam Physical Vapour Deposited Ni-23.5Cr-2.66Co-1.44Al Superalloy Sheet During Annealing at 600 °C
Mingwei, Li;Gang, Zeng;Yesheng, Zhong;Fei, He;Xiaodong, He;
Materials Research , 2013, DOI: 10.1590/S1516-14392012005000145
Abstract: microstructure evolution of electron beam physical vapour deposited (eb-pvd) ni?23.5cr?2.66co?1.44al superalloy sheet during annealing at 600 °c was investigated. the results showed that the as-deposited alloy was composed of only g phase. after annealing at 600 °c, the locations of diffraction peaks were still the same. the (220) diffraction peak of the deposition side increased with annealing time. the sheet on deposited side had a tendency toward forming (220) texture during post-annealing. no obvious texture was observed at as-deposited and annealed sheet at 600 °c in substrate side. the count and size of "voids" decreased with time. the size of grains increased obviously with annealing time. the ultimate tensile strength of eb-pvd ni-23.5cr-2.66co-1.44al alloy sheet increased from 641 mpa to 829 mpa after annealing at 600 °c for 30 hours.
Nanoscale Metamaterial Optical Waveguides with Ultrahigh Refractive Indices
Yingran He,Sailing He,Jie Gao,Xiaodong Yang
Physics , 2012, DOI: 10.1364/JOSAB.29.002559
Abstract: We propose deep-subwavelength optical waveguides based on metal-dielectric multilayer indefinite metamaterials with ultrahigh effective refractive indices. Waveguide modes with different mode orders are systematically analyzed with numerical simulations based on both metal-dielectric multilayer structures and the effective medium approach. The dependences of waveguide mode indices, propagation lengths and mode areas on different mode orders, free space wavelengths and sizes of waveguide cross sections are studied. Furthermore, waveguide modes are also illustrated with iso-frequency contours in the wave vector space in order to investigate the mechanism of waveguide mode cutoff for high order modes. The deep-subwavelength optical waveguide with a size smaller than {\lambda}0/50 and a mode area in the order of 10-4 {\lambda}02 is realized, and an ultrahigh effective refractive index up to 62.0 is achieved at the telecommunication wavelength. This new type of metamaterial optical waveguide opens up opportunities for various applications in enhanced light-matter interactions.
Giant Transverse Optical Forces in Nanoscale Slot Waveguides of Hyperbolic Metamaterials
Yingran He,Sailing He,Jie Gao,Xiaodong Yang
Physics , 2012, DOI: 10.1364/OE.20.022372
Abstract: Here we demonstrate that giant transverse optical forces can be generated in nanoscale slot waveguides of hyperbolic metamaterials, with more than two orders of magnitude stronger compared to the force created in conventional silicon slot waveguides, due to the nanoscale optical field enhancement and the extreme optical energy compression within the air slot region. Both numerical simulation and analytical treatment are carried out to study the dependence of the optical forces on the waveguide geometries and the metamaterial permittivity tensors, including the attractive optical forces for the symmetric modes and the repulsive optical forces for the anti-symmetric modes. The significantly enhanced transverse optical forces result from the strong optical mode coupling strength between two metamaterial waveguides, which can be explained with an explicit relation derived from the coupled mode theory. Moreover, the calculation on realistic metal-dielectric multilayer structures indicates that the predicted giant optical forces are achievable in experiments, which will open the door for various optomechanical applications in nanoscale, such as optical nanoelectromechanical systems, optical sensors and actuators.
Deep subwavelength beam propagation in extremely loss-anisotropic metamaterials
Yingran He,Lei Sun,Sailing He,Xiaodong Yang
Physics , 2013, DOI: 10.1088/2040-8978/15/5/055105
Abstract: Metal-dielectric multilayer metamaterials with extreme loss-anisotropy, in which the longitudinal component of the permittivity tensor has ultra-large imaginary part, are proposed and designed. Diffraction-free deep subwavelength beam propagation and manipulation, due to the nearly flat iso-frequency contour (IFC), is demonstrated in such loss-anisotropic metamaterials. It is also shown that deep subwavelength beam propagation can be realized in practical multilayer structures with large multilayer period, when the nonlocal effect is considered.
Expected Difference, Equity Nature and the Corporate Control Agreement Transfer Failed—the Evidence from China  [PDF]
Xiaodong Li
Journal of Service Science and Management (JSSM) , 2011, DOI: 10.4236/jssm.2011.41004
Abstract: This paper has researched the issue of corporate control transfer failed in china capital market, which is completely different from existing studies in corporate control transfer field. The conclusion has shown that corporate control transfer very likely fails when there is a great difference between two sides of deals. And the equity nature is another affection factor. The corporate control transfer is not likely to fail when the equity nature is state-owned. The conclusion implies that we should make more improvement for institutions of corporate control transfer, because of the lack of market voluntary trade rule in china capital market.
The Optimal Power Flow Calculation of Power System Based on the Annealing Algorithm  [PDF]
Xiaodong Yu
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B153

The result of OPF whose task is to compute the voltage and angle of each node in power system is the basic of stability calculation and failure analysis in power system. For this goal, the idea of simulated annealing method is introduced, mixed with the greedy randomized algorithm (GRASP), and then the hybrid SA algorithm is obtained. The algorithm is applied to the multi-objective optimal power flow calculation of power system, and the effectiveness of the algorithm given in this paper is verified by analysis of examples.

Delayed apoptosis by neutrophils from COPD patients is associated with altered bak, bcl-xl, and mcl-1 mRNA expression
Jisong Zhang, Jian He, Jingwen Xia, Zhen Chen, Xiaodong Chen
Diagnostic Pathology , 2012, DOI: 10.1186/1746-1596-7-65
Abstract: Neutrophils were isolated from peripheral blood samples of 47 COPD patients (smokers: N?=?24) and 47 healthy controls (smokers: N?=?24). Percentages of apoptotic cells were determined at 4, 24, and 36 h for unstimulated neutrophils cultured in vitro. Neutrophil mRNA expression of Bak, Bcl-xl, and Mcl-1 was determined by real-time polymerase chain reaction (PCR). FEV1 (% predicted) and FVC were determined by spirometry and correlations between mRNA levels and lung function parameters were determined.The percentages of apoptotic cells among unstimulated neutrophils from COPD patients were significantly lower compared to cells from controls after 4, 24, and 36 h in culture; smoking history had only a minimal effect on these differences. Unstimulated neutrophils from COPD patients had significantly lower Bak mRNA expression and higher expressions of Bcl-xl and Mcl-1 mRNA than cells from healthy controls. Again, smoking history had only a minimal effect on these trends. Bak mRNA expression was significantly positively correlated with both % predicted FEV1 and the FEV1/FVC ratio, while Bcl-xl and Mcl-1 mRNA expressions were significantly negatively correlated with %predicted FEV1 and the FEV1/FVC ratio.The genes for pro-apoptotic Bak, and anti-apoptotic Bcl-xl and Mcl-1 may be important in regulating the delayed neutrophil apoptosis observed in COPD, which may contribute to COPD pathogenesis.The virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/1605269445677066Chronic obstructive pulmonary disease (COPD) is characterized by irreversible airflow limitation [1]. COPD is also characterized by an abnormal inflammatory response to noxious gases, especially cigarette smoke, and these abnormal inflammatory responses exacerbate airflow obstruction [2]. An inflammatory pulmonary infiltrate comprised primarily of neutrophils is important in COPD pathogenesis. Delayed cellular apoptosis can prolong the life of neutrophils and can lead
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