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Search Results: 1 - 10 of 37465 matches for " Tao Shi "
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Bargmann Symmetry Constraint and Binary Nonlinearization of Super NLS-MKdV Hierarchy  [PDF]
Sixing Tao, Hui Shi
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.45B002
Abstract:

An explicit Bargmann symmetry constraint is computed and its associated binary nonlinearization of Lax pairs is carried out for the super NLS-MKdV hierarchy. Under the obtained symmetry constraint, the n-th flow of the super NLS-MKdV hierarchy is decomposed into two super finite-dimensional integrable Hamiltonian systems, defined over the super-symmetry manifold R4N|2N with the corresponding dynamical variables x and tn. The integrals of motion required for Liouville integrability are explicitly given.

Financial Constraints, Financing Channels and Corporations’ R&D Investment
—Based on Development Phase and Heterogeneity of Operating Cash Flow
 [PDF]

Xuhui Shi, Tao Wu
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.45028
Abstract: R&D investment is an important corporate data that government needs to pay attention to especially when Chinese economy is facing essential transition. Considering the diversity of R&D phase and cash flow condition, we divide the corporations listed in the growth enterprise market (GEM) into four types and discuss corporations’ preferred channels to finance R&D investment and if each type of corporations faces identical financial constraints. Using panel data and q model, our analysis proves that listed corporations in GEM are facing financial constraints; operating cash flow is still the main capital source of R&D investment. If cash flow was favorable, corporations whose R&D project is in development phrase would prefer to finance R&D investment by debt and equity channels, bearing more loosely financial constraints. If cash flow was deficient, the channel of debt financing would no longer support R&D, and corporations in development phrase would more rely on equity financing, while corporations in research phrase would just maintain a low level of R&D investment by cash in hold.
Arbuscular Mycorrhizal Fungus Mediate Changes in Mycorrhizosphere Soil Aggregates  [PDF]
Tao Liang, Xiaojun Shi, Tao Guo, Sili Peng
Agricultural Sciences (AS) , 2015, DOI: 10.4236/as.2015.612141
Abstract: Many studies have shown that arbuscular mycorrhizal (AM) fungus has an important role in soil aggregate formation and stabilization. While most studies about the effects of AM fungus on soil aggregate have experimental set-ups in single pots or containers with two compartments, these studies cannot differentiate the effects of roots, mycorrhizal roots or hyphae. In this study we used containers with four compartments to split the roots and quantitatively compare the change of soil aggregate in the mycorrhizosphere soil, rhizosphere soil, hyphosphere soil and bulk soil. Our results demonstrate a significant positive correlation among hyphal length density, easily extractable glomalin (EEG) and aggregate mean weight diameter (MWD), geometric mean diameter (GMD) and percentage of soil macroaggregate with a diameter larger than 0.25 mm (R0.25). The GMD and MWD of R0.25 in the hyphal compartment were higher than those in the non-inoculated root compartment, but were lower than those in the mycorrhizal compartment. This suggests the mycorrhizal hyphae had a greater effect than the non-inoculated roots, but less of an effect than the mycorrhizal roots on the formation and stabilization of soil aggregate. The results reveal that plant roots, mycorrhizal roots and mycorrhizal hyphae contribute to aggregate stability in individual ways and that their effects are additive, creating a synergistic stabilizing effect.
Power Quality Analysis of Photovoltaic Generation Integrated in User-Side Grid
Zhou Chang,Shi Tao
International Journal of Computer and Electrical Engineering , 2013, DOI: 10.7763/ijcee.2013.v5.690
Abstract: This paper analyzes impacts of grid-connected photovoltaic power plant on the harmonic current in the power quality aspect of distribution network, Summaries the requirement of harmonic current injecting in grid caused by photovoltaic power plant which connected in user side. Based on the DIgSILENT PowerFactory simulation platform, this paper simulates harmonic current injecting into grid in one case of grid-connected photovoltaic generation and then analyzes it by build models of photovoltaic generation and power grid belonged the user. The result illustrated that the harmonic current caused by user side grid connected photovoltaic generation injecting into grid satisfies standards requirements, the photovoltaic generation system should have 400kvar reactive power regulation capability.
Differential Detection of Space-Time Spreading with Two Transmit Antennas
Shi Tao,Cao Lei
EURASIP Journal on Wireless Communications and Networking , 2006,
Abstract: A differential detection scheme for space-time spreading with two transmit antennas is proposed. The scheme does not require channel state information at either the transmitter or the receiver. With segmentation and preamble symbols padded at the transmitter, the receiver recovers the information using differential detection. Both phase-shift keying (PSK) and quadrature amplitude modulation (QAM) signals are considered. The proposed scheme achieves two-level transmit diversity gain with low complexity and saves the use of channel estimation, while having about 3 dB performance loss as compared to the coherent detection scheme. When multiple receive antennas exist, additional receive diversity gain can be achieved along with the transmit diversity gain. The scheme works fine under block-fading channel as well as slow Rayleigh fading channel, which is a popular scenario for high-rate data communications. The system performance for different segment sizes, channel fading speeds, modulation methods, and numbers of receive antennas is studied through simulations.
Differential Detection of Space-Time Spreading with Two Transmit Antennas
Tao Shi,Lei Cao
EURASIP Journal on Wireless Communications and Networking , 2006,
Abstract: A differential detection scheme for space-time spreading with two transmit antennas is proposed. The scheme does not require channel state information at either the transmitter or the receiver. With segmentation and preamble symbols padded at the transmitter, the receiver recovers the information using differential detection. Both phase-shift keying (PSK) and quadrature amplitude modulation (QAM) signals are considered. The proposed scheme achieves two-level transmit diversity gain with low complexity and saves the use of channel estimation, while having about 3 dB performance loss as compared to the coherent detection scheme. When multiple receive antennas exist, additional receive diversity gain can be achieved along with the transmit diversity gain. The scheme works fine under block-fading channel as well as slow Rayleigh fading channel, which is a popular scenario for high-rate data communications. The system performance for different segment sizes, channel fading speeds, modulation methods, and numbers of receive antennas is studied through simulations.
Observing dipolar confinement-induced resonances in waveguides
Tao Shi,Su Yi
Physics , 2013, DOI: 10.1103/PhysRevA.90.042710
Abstract: We develop a theoretical framework for the quasi-low-dimensional confinement-induced resonances (CIRs) of particles with the arbitrary three-dimensional two-body interactions, based on the Huang-Yang pseudopotential and the treatment of Feshbach resonances. Using this new approach, we analytically obtain some universal properties of dipolar CIRs in quasi-one-dimensional (1D) waveguides. We also show that the dipolar CIRs can be induced by tuning the angle between the dipole moments and the waveguide, which is experimentally observable in quasi-1D Cr and Dy atomic gases. We expect that these tilting angle induced CIRs will open up a new simpler way to control the resonant scatterings in quasi-low-dimensional systems.
An FPGA-based Parallel Architecture for Face Detection using Mixed Color Models
Luo Tao,Shi zaifeng
Computer Science , 2014,
Abstract: In this paper, a reliable method for detecting human faces in color images is proposed. This system firstly detects skin color in YCgCr and YIQ color space, then filters binary texture and the result is morphological processed, finally converts skin tone to the preferred skin color configured by users in YIQ color space. The real-time adjusting circuit is implemented and some of simulation results are given out. Experimental results demonstrate that the method has achieved high rates and low false positives, another advantage is its simplicity and minor computational costs.
Scalable Spectral Algorithms for Community Detection in Directed Networks
Sungmin Kim,Tao Shi
Computer Science , 2012,
Abstract: Community detection has been one of the central problems in network studies and directed network is particularly challenging due to asymmetry among its links. In this paper, we found that incorporating the direction of links reveals new perspectives on communities regarding to two different roles, source and terminal, that a node plays in each community. Intriguingly, such communities appear to be connected with unique spectral property of the graph Laplacian of the adjacency matrix and we exploit this connection by using regularized SVD methods. We propose harvesting algorithms, coupled with regularized SVDs, that are linearly scalable for efficient identification of communities in huge directed networks. The proposed algorithm shows great performance and scalability on benchmark networks in simulations and successfully recovers communities in real network applications.
Oilseed-Vegetable-Dual-Purpose Rape Key Technology Research and Its Application Prospect Analysis  [PDF]
Hualei Huang, Youming Shi, Tao Liu, Yan Zhou
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.513137
Abstract:

This paper mainly studied on the key cultivation technology of oilseed-vegetable-dual-purpose rape, experiments with laboratory testing, including the research of suitable height of harvesting shoot, the degree of harvesting shoot, the contrast experiment of large blocks, nutrition structure analysis of shoot. Harvesting shoot have a certain impact on yield and agronomic traits, but its total economic benefit is very significant, and is a rape synergistic technology good for promotion, having broad application prospects.

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