Journal of Shanghai University (English Edition)

Publisher: Shanghai da xue, Springer Verlag

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Website Journal of Shanghai University (English Edition ) website
Other titles Shanghai da xue xue bao., Shanghai da xue xue bao (Ying wen ban), Journal of Shanghai University
ISSN 1007-6417
OCLC 67619097
Material type Document, Periodical, Internet resource
Document type Internet Resource, Computer File, Journal / Magazine / Newspaper

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Springer Verlag

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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: The stability and chaotic vibrations of a pipe conveying fluid with both ends fixed, excited by the harmonic motion of its supporting base in a direction normal to the pipe span, were investigated with the aid of modern numerical techniques, involving the phase portrait, Lyapunov exponent and Poincare map etc. The nonlinear differential equations of motion of the system were derived by considering the additional axial force due to the lateral motion of the pipe. Attention was concentrated on the effect of forcing frequency and flow velocity on the dynamics of the system. It is shown that chaotic motions can occur in this system in a certain region of parameter space, and it is also found that three types of routes to chaos exist in the system: (i)period-doubling bifurcations; (ii)quasi-periodic motions; and (iii)intermittent chaos.
    Journal of Shanghai University (English Edition) 05/2012; 4(3):179-185. DOI:10.1007/s11741-000-0058-1
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    ABSTRACT: The calculation procedure of the continuum mechanics of textured polycrystals (CMTP) method is reviewed to estimate calculating time with various yield functions (YFs). A so-called semi-quadratic YF is proposed to eliminate time-consuming numerical calculation and avoid the decrease of prediction precision. The reasonability of the new YF is proved by making the comparisons between predicted R-values and earing behaviour for some materials and the experimental results.
    Journal of Shanghai University (English Edition) 05/2012; 4(4):327-331. DOI:10.1007/s11741-000-0052-7
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    ABSTRACT: In this paper, the improvement of pure random search is studied. By taking some information of the function to be minimized into consideration, the authors propose two stochastic global optimization algorithms. Some numerical experiments for the new stochastic global optimization algorithms are presented for a class of test problems.
    Journal of Shanghai University (English Edition) 05/2012; 4(2):92-95. DOI:10.1007/s11741-000-0002-4
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    ABSTRACT: In this paper, the second generation wavelet transform is applied to image lossless coding, according to its characteristic of reversible integer wavelet transform. The second generation wavelet transform can provide higher compression ratio than Huffman coding while it reconstructs image without loss compared with the first generation wavelet transform. The experimental results show that the second generation wavelet transform can obtain excellent performance in medical image compression coding.
    Journal of Shanghai University (English Edition) 04/2012; 4(3):225-229. DOI:10.1007/s11741-000-0067-0
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    ABSTRACT: A new watermarking scheme using principal component analysis (PCA) is described. The proposed method inserts highly robust watermarks into still images without degrading their visual quality. Experimental results are presented, showing that the PCA-based watermarks can resist malicious attacks including lowpass filtering, re-scaling, and compression coding.
    Journal of Shanghai University (English Edition) 04/2012; 4(1):22-26. DOI:10.1007/s11741-000-0026-9
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    ABSTRACT: Based on the analysis of primary energy consumption structure in five main provinces or municipalities in China, the factors that affect carbon emissions in the five study areas are analyzed quantitatively and comparatively with the decomposition analysis method. Empirical results demonstrate that the decomposition models of carbon emissions can be defined as “municipality model” and “provincial model”, and the population factor of “municipal model” plays a significant role in carbon emissions than that of “provincial model”. Either positive or negative effects of energy structure can be found in five different areas. However, there is a general trend that energy structure effort is becoming more and more important. Based on the characteristics and trends of carbon emissions in different areas, the carbon reduction measures are proposed as well.
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0779-3
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    ABSTRACT: A class of second-order nonlinear damped perturbed differential equations is considered and its oscillation theorems are studied. These theorems are more general and deal with the cases which are not covered by the known criteria. Particularly, these criteria extend and unify some existing results. An example is given to verify the results.
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0777-1
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    ABSTRACT: Based on the lattice Boltzmann method (LBM), an improved pseudo-potential model, combined with a method of adding force term, is used to simulate the two-phase flows caused by a liquid droplet impacting on a liquid film. In this model, the different phases are treated as one fluid, and the interfaces between the vapor and liquid phases can be obtained by density value of the fluid. This variant of the LBM allows one to obtain the densities of vapor and liquid with high accuracy. The model is validated by an example of phase separation. The early stage of the impact of droplet on liquid film is simulated, and the results are qualitatively consistent with physical phenomena.
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0776-1
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    ABSTRACT: Silicon carbide nanotubes (SiCNTs) with special morphology synthesized by supercritical hydrothermal method at 470 °C and 8 MPa have been reported in this paper. SiCNTs with special morphology were characterized by transmission electron microscopy (TEM) and high-resolution TEM (HRTEM). There are two kinds of silicon carbide with special morphology: One is oval SiCNTs with small aspect ratio, the other is bamboo cone-shape structure. SiCNTs have been analyzed by fluorescence spectrometer. The results indicate that the SiCNTs have strong photoluminescence (PL) property. The SiCNTs with oval shape are one kind of intermediate state of growth process of nanotube. The growth mechanism of silicon nanotubes has been proposed based on experiment data. The investigations of growth mechanism of SiCNTs with bamboo structure show that the defect produced in the growth process play the important role in SiCNTs with special structure.
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0782-3
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    ABSTRACT: Laser shock processing (LSP), also known as laser peening, is a novel surface treatment technique in the past few years. Compressive residual stresses which imparted by LSP are very important for improving fatigue, corrosion and wear resistance of metals. Finite element analysis (FEA) simulation using ABAQUS software has been applied to predict residual stresses induced by LSP on Ti-6Al-4V titanium alloy with laser pulse duration 30 ns and water confined ablation mode. The residual stress field generated by different shape laser spots was studied, and the square laser spot is shown the most suitability for avoiding stress lack phenomenon and overlapping LSP. Surface residual stresses and plastically affected depth within single square spot both increased with the increase of laser intensity and laser shock times. Furthermore, compared with circle and ellipse spot, the residual stress distribution in overlapping square spots is very uniform only with small overlapping ratio. LSP with square spot can process advantageous residual stress field, and this technique will be used widely.
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0785-1
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    ABSTRACT: Based on the principle of general relativity, geometrization of interaction, the interaction of the inhomogeneous isotropic medium to light can be equated to a non-Euclidean geometry field just like the situation of gravity, i.e., light travels in the null geodesic in the non-Euclidean curved space-time, which is equivalent to the Fermat principle for the inhomogeneous media. In this paper, the propagation of light in an inhomogeneous media is studied by means of the effective metric theory. The modification to the classical ray equation of photons is derived from the geodesic equation of photon by considering the spin effect of photons, which is induced via the spin-orbit coupling of photons, and the corresponding Hamiltonian of photon is proposed. Based on the spin-orbit coupling of photon, a light splitting phenomenon emerges in the inhomogeneous media, which is the spin hall effect of photon.
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0780-3
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    ABSTRACT: File semantic has proven effective in optimizing large scale distributed file system. As a consequence of the elaborate and rich I/O interfaces between upper layer applications and file systems, file system can provide useful and insightful information about semantic. Hence, file semantic mining has become an increasingly important practice in both engineering and research community. Unfortunately, it is a challenge to exploit file semantic knowledge because a variety of factors could affect this information exploration process. Even worse, the challenges are exacerbated due to the intricate interdependency between these factors, and make it difficult to fully exploit the potentially important correlation among various semantic knowledges. This article proposes a file access correlation miming and evaluation reference (FARMER) model, where file is treated as a multivariate vector space, and each item within the vector corresponds a separate factor of the given file. The selection of factor depends on the application, examples of factors are file path, creator and executing program. If one particular factor occurs in both files, its value is non-zero. It is clear that the extent of inter-file relationships can be measured based on the likeness of their factor values in the semantic vectors. Benefit from this model, FARMER represents files as structured vectors of identifiers, and basic vector operations can be leveraged to quantify file correlation between two file vectors. FARMER model leverages linear regression model to estimate the strength of the relationship between file correlation and a set of influencing factors so that the “bad knowledge” can be filtered out. To demonstrate the ability of new FARMER model, FARMER is incorporated into a real large-scale object-based storage system as a case study to dynamically infer file correlations. In addition FARMER-enabled optimize service for metadata prefetching algorithm and object data layout algorithm is implemented. Experimental results show that is FARMER-enabled prefetching algorithm is shown to reduce the metadata operations latency by approximately 30%–40% when compared to a state-of-the-art metadata prefetching algorithm and a commonly used replacement policy.
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0789-2
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    ABSTRACT: A novel direct-drive type wind power generation system based on hybrid excitation synchronous machine (HESM) is introduced in this paper. The generator is connected to an uncontrollable rectifier, and a fully controlled voltage-source inverter is used to connect the system to utility grid. An intermediate DC bus exists between the rectifier and inverter. A new control strategy is proposed which achieves the maximum power point tracking (MPPT) with the control of excitation current of HESM and stabilizes the DC link voltage with the control of inverter output current simultaneously. Specially-designed buck circuit is used to control the excitation current of HESM, and grid voltage-oriented vector control strategy is employed to realize the decoupling of the inverter output power. Simulation results and experiment in 3 kW lab prototype show an excellent static and dynamic performance of the proposed system.
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0787-2
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    ABSTRACT: Arbitrary topological curve network has no restriction in topology structure, so it has more powerful representing ability in defining complex surfaces. A complex surface modeling system is presented based on arbitrary topological curve network and the improved combined subdivision method, its functions including creating and editing curve network, and generating and modifying curve network's interpolated surface. This modeling system can be used to the process of products' concept design, and its applications is also significant to the development of subdivision method.
    Journal of Shanghai University (English Edition) 12/2011; 15(6):557-561. DOI:10.1007/s11741-011-0786-2
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    ABSTRACT: Let Γ 2n d be the set of trees with a given diameter d having a perfect matching, where 2n is the number of vertex. For a tree T in Γ 2n d , let P d+1 be a diameter of T and q = d − m, where m is the number of the edges of perfect matching in P d+1. It can be found that the trees with minimal energy in Γ 2n d for four cases q = d−2, d−3, d−4, [ d/2], and two remarks are given about the trees with minimal energy in Γ 2n d for $\tfrac{{2d - 3}} {3} \leqslant q \leqslant d - 5$ and $\left[ {\tfrac{d} {2}} \right] + 1 \leqslant q \leqslant \tfrac{{2d - 3}} {3} - 1$ .
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0774-1
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    ABSTRACT: This paper makes an approach to the approximate optimum in structural design, which combines the global response surface (GRS) based multivariate adaptive regression splines (MARS) with Move-Limit strategy (MLS). MARS is an adaptive regression process, which fits in with the multidimensional problems. It adopts a modified recursive partitioning strategy to simplify high-dimensional problems into smaller highly accurate models. MLS for moving and resizing the search sub-regions is employed in the space of design variables. The quality of the approximation functions and the convergence history of the optimization process are reflected in MLS. The disadvantages of the conventional response surface method (RSM) have been avoided, specifically, highly nonlinear high-dimensional problems. The GRS/MARS with MLS is applied to a high-dimensional test function and an engineering problem to demonstrate its feasibility and convergence, and compared with quadratic response surface (QRS) models in terms of computational efficiency and accuracy.
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0783-2
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    ABSTRACT: In this paper, we study a semi-linear reaction-diffusion system with a weighted nonlocal source, subject to the null Dirichlet boundary condition. Under certain conditions, we prove that the classical solution exists globally and blows up in finite time respectively, and then obtain the uniform blow-up rate in the interior.
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0775-1
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    ABSTRACT: In this paper, a distributed compressive spectrum sensing scheme in wideband cognitive radio networks is investigated. An analog-to-information converters (AIC) RF front-end sampling structure is proposed which use parallel low rate analog to digital conversions (ADCs) and fewer storage units for wideband spectrum signal sampling. The proposed scheme uses multiple low rate congitive radios (CRs) collecting compressed samples through AICs distritbutedly and recover the signal spectrum jointly. A general joint sparsity model is defined in this scenario, along with a universal recovery algorithm based on simultaneous orthogonal matching pursuit (S-OMP). Numerical simulations show this algorithm outperforms current existing algorithms under this model and works competently under other existing models.
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0788-2
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    ABSTRACT: For the sequences satisfying the recurrence relation of the second order, the generating functions for the products of the powers of these sequences are established. This study was from Carlita and Riordan who began a study on closed form of generating functions for powers of second-order recurrence sequences. This investigation was completed by Stănică. Inspired by the recent work of István about the non-closed generating functions of the products of the powers of the second-order sequences, the authors give several extensions of István’s results in this paper.
    Journal of Shanghai University (English Edition) 12/2011; 15(6). DOI:10.1007/s11741-011-0778-1