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东华大学学报（英文版）
东华大学
东华大学学报（英文版）

东华大学

严濒景

双月刊

1672-5220

xuebao@dhu.edu.cn

021-62373643

200051

上海市延安西路1882号《东华大学学报》编辑部

东华大学学报（英文版）/Journal Journal of Donghua University(English Edition)EI
查看更多>>本刊以纺织、合成纤维、服装等学科为特色，兼顾相关学科的学术刊物，主要刊载本校师生员工的科技论文，同时也刊载校外、海外的科研论文。
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    Physicochemical Properties of Poly (Vinyl Alcohol)/Chitosan/Soluble Starch Composite Hydrogel

    WANG LeiHUANG YifanBAO ZelinLI Tingxiao...
    455-459页
    查看更多>>摘要：Fabricating of hydrogels based upon polymers and inorganic matter is an innovative replacement for the generation of adaptable matrices. In this study, the poly(vinyl alcohol) (PVA)/chitosan (CS)/soluble starch (SS) composite hydrogel was prepared by the solution blending method, in which SS was used as a cross-linking agent to cross-link with PVA in order to improve the stability of PVA in the tissue fluid. The composition and the thermal stability of hydrogels were characterized by Fourier transform infrared (FTIR) spectroscopy and thermo gravimetric analysis (TGA) . The result shows that the PVA/CS/SS composite hydrogel possesses potentially morphological and thermal stability and can be used for tissue engineering.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 万方数据

    Synthesis, Structure and Properties of a Novel Copolymer with Photochromic and Photoluminescence Functions

    YANG LongZHAO TianxiangSHU DengkunXI Peng...
    460-469页
    查看更多>>摘要：Photochromic and photoluminescence materials show bright colors under different excitation conditions, and thus, these functional materials have been applied in many fields. Based on the photochromic and photoluminescence theories, a block copolymer, which could be directly processed into nanofibers by electrospinning, was successfully prepared through atom transfer radical polymerization ( ATRP ) . To synthesize the block copolymer, a vinyl monomer containing a spiropyran unit was employed to prepare the photochromic chain segment, and a polymethyl methacrylate ( PMMA) chain segment was introduced to improve the processability of the block copolymer. Acting as the photoluminescence unit, the rare earth complex was linked to the side chain through coordination bonding between the rare earth ions and the ester groups of PMMA. When the photochromic and photoluminescence block copolymer was exposed to different wavelengths of ultraviolet ( UV ) light and visible ( Vis ) light, it could show white, red, green, yellow, and blue-purple. These results provide the potential of the as-prepared photochromic and photoluminescence block copolymer for application in fibers and fabrics.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 万方数据

    Dynamic Modeling of Variable Stiffness and Damping for Spatial Linkage Weft Insertion Mechanism with Clearance

    LI BoHU KaiJIN GuoguangWEI Zhan...
    470-482页
    查看更多>>摘要：In order to further analyze the influence of clearance on the kinematic performance of spatial linkage weft insertion mechanism, it is necessary to study the dynamic characteristics of contact impact force model with the variable stiffness and damping coefficient. Firstly, the parameters in the output process of the system are solved by describing of the flexible joint clearance. Then, based on Lankarani-Nikravesh contact force model, the contact impact stiffness and damping coefficient is modified from fixed values to time-varying coefficients. The dynamic model of spatial linkage weft insertion mechanism with modified clearance is established by Lagrange method, and the dynamic characteristics of the system are calculated. The results show that the joint clearance can directly affect the output performance of the mechanism. With the increase of the clearance value, the curve fluctuations of acceleration, driving torque and collision force are obvious, and it will be further intensified with the increase of spindle speed, which greatly affects the stability of mechanism and fabric quality. Finally, the virtual prototype is established by the SolidWorks software and simulated by the ADAMS software. The simulation results are compared with the numerical results, which verifies the accuracy of the modeling method in this paper.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 维普
    • 万方数据

    Effect of Different Types of Structural Configuration on Air Distribution in a Compact Purification Device

    YANG XuebinLIANG LeLIU HaoLIU Lin...
    483-492页
    查看更多>>摘要：In some old industrial plants, in order to meet the increasingly strict requirements of pollutant emission limits, it is necessary to install the compact filtration and/or purification devices in a given narrow machine room. Different types of structural configuration might influence air distribution inside these devices. The unreasonable air distribution might lead each part of filtration or purification media to operating at largely different air flow rates. Based on a computational fluid dynamics ( CFD) model, this study explores the influence of different outlet positions and different upper heights on the flow field inside chamber. The porous medium model is employed to simulate the air flow in porous media. The changing structural configurations include three positioning cases of the outlet opening and eight height cases of the upper chamber. The root mean square is defined as the non-uniformity coefficient to evaluate the uniformity of air flow distribution. The results show that the farther distance between inlet and outlet openings will bring more uniform air distribution, and the increasing height of upper chamber totally trends to exhibit more uniform air distribution.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 维普
    • 万方数据

    Design and Lamination Process of Composite Fabric for Automobile

    GUO YanQIANG ShengCUI WeiweiSONG Minfang...
    493-497页
    查看更多>>摘要：The composite fabric is a new type of automobile fabric in recent years. The three-layer composite fabric was made of different materials that were linen weaving fabric, knitting fabric and warp-knitted spacer fabric. Through testing performances of three different adhesives, the thermoplastic urethanes ( TPU ) hot melt powder was selected to adhere every fabric. Then, the laminating process was designed and applied. The optimized process conditions were following:the temperature was 150 ℃, the pressure was 2. 0 N · cm-2 , the time was 80 s, and the dosage of adhesive was 20 g · m-2 . This new laminated fabric has multi-functions, such as comfortability, permeability and physic mechanical properties. This lamination process will be used to be the basis for the study of functional laminated car seat fabric.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 维普
    • 万方数据

    Energy-Delay Tradeoff for Online Offloading Based on Deep Reinforcement Learning in Wireless Powered Mobile-Edge Computing Networks

    WANG ZhonglinCAO HankaiZHAO PingRAO Wei...
    498-503页
    查看更多>>摘要：Benefited from wireless power transfer ( WPT ) and mobile-edge computing ( MEC ) , wireless powered MEC systems have attracted widespread attention. Specifically, we design an online offloading scheme based on deep reinforcement learning that maximizes the computation rate and minimizes the energy consumption of all wireless devices ( WDs) . Extensive results validate that the proposed scheme can achieve better tradeoff between energy consumption and computation delay.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 维普
    • 万方数据

    Optimization Method of Bearing Support Positions in a High-Speed Flexible Rotor System

    TANG ChangkeJIANG YanhongLIU Jing
    504-511页
    查看更多>>摘要：Bearing support position is one of main factors affecting vibration characteristics of rotor systems. To optimize the bearing support positions in a high-speed flexible rotor system ( HSFRS ) based on the vibration characteristics, an optimization method of bearing support positions in the HSFRS is proposed. In this method, a finite element ( FE) model of a high-speed flexible rotor ( HSFR) was established. The natural frequencies and mode shapes of the HSFRS were used to obtain the initial design scheme of the bearing support positions. A frequency characteristic equation of the HSFRS was established to obtain the critical speeds of the HSFRS. And a dynamic model of the HSFRS was established to analyze the vibration characteristics for different bearing support position cases. The problem of optimizing bearing support positions in the HSFRS was solved by the developed method. The results showed that vibration amplitudes of the HSFRS were more stable when the bearing support positions were optimized. This study can provide a new method for optimizing bearing support positions of rotor systems.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 维普
    • 万方数据

    Deep Knowledge Tracing Embedding Neural Network for Individualized Learning

    HUANG YongfengSHI Jie
    512-520页
    查看更多>>摘要：Knowledge tracing is the key component in online individualized learning, which is capable of assessing the users' mastery of skills and predicting the probability that the users can solve specific problems. Available knowledge tracing models have the problem that the assessments are not directly used in the predictions. To make full use of the assessments during predictions, a novel model, named deep knowledge tracing embedding neural network ( DKTENN) , is proposed in this work. DKTENN is a synthesis of deep knowledge tracing ( DKT) and knowledge graph embedding ( KGE) . DKT utilizes sophisticated long short-term memory ( LSTM) to assess the users and track the mastery of skills according to the users' interaction sequences with skill-level tags, and KGE is applied to predict the probability on the basis of both the embedded problems and DKT's assessments. DKTENN outperforms performance factors analysis and the other knowledge tracing models based on deep learning in the experiments.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 维普
    • 万方数据

    Counterexample of Local Fractional Order Chain Rule and Modified Definition of Local Fractional Order

    FAN KaiZHOU Cunlong
    521-525页
    查看更多>>摘要：Fractional calculus is a powerful tool for modeling nonlinear systems. It is necessary to discuss the basic properties of fractional order before solving a fractional order model. Using the formula of power function defined by local fractional derivative and the chain rule to calculate a compound function, the results are inconsistent. This shows that the chain rule of local fractional derivatives similar to classical calculus is suspicious, and fractional complex transformation based on the chain rule is also suspicious and needs further discussion. In order to overcome this inconsistency, an improved definition of local fractional derivative, which can be regarded as a fractal derivative, is proposed based on the results derived from the relationship between the mass function and the Hausdorff measure.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 维普
    • 万方数据

    Prediction of Logistics Demand via Least Square Method and Multi-Layer Perceptron

    WEI LeqinZHANG Anguo
    526-533页
    查看更多>>摘要：To implement the prediction of the logistics demand capacity of a certain region, a comprehensive index system is constructed, which is composed of freight volume and other eight relevant economic indices, such as gross domestic product ( GDP ) , consumer price index ( CPI ) , total import and export volume, port's cargo throughput, total retail sales of consumer goods, total fixed asset investment, highway mileage, and resident population, to form the foundation for the model calculation. Based on the least square method ( LSM) to fit the parameters, the study obtains an accurate mathematical model and predicts the changes of each index in the next five years. Using artificial intelligence software, the research establishes the logistics demand model of multi-layer perceptron ( MLP ) neural network, makes an empirical analysis on the logistics demand of Quanzhou City, and predicts its logistics demand in the next five years, which provides some references for formulating logistics planning and development strategy.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 维普
    • 万方数据