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Now showing items 1 - 16 of 482

  • Triple-shape memory effect in poly (ethylene terephthalate) (PET) film

    Wu, Xue Lian   Yang, Chuan Peng   Guo, Yu Qin   Wang, Hong Yu  

    Purpose - This paper aims to focus on achieving triple-shape memory effect (triple-SME) of a commercial poly (ethylene terephthalate) (PET) film with the thickness of 100 mu m. Design/methodology/approach - The thermal characteristics and microstructure of PET film were characterized by differential scanning calorimetry, thermogravimetric analysis and wide-angle X-ray diffraction analysis. The dual-shape memory effect (dual-SME) of the PET film was then systematically investigated, and based on that, triple-SME in thin PET film was achieved. Findings - Investigation of the dual-SME in PET film revealed the difference between recovery temperature and programming temperature reduced with increasing programming temperature. An obvious intermediate shape shifting between the original and final programmed shape was observed during shape recovery in triple-shape memory behaviors. Research limitations/implications - Compared with dual-SME in polymer, relatively less work has been done on multi-SME in polymer, especially in thin polymer film. In this study, triple-SME in a PET film was investigated based on the results of dual-SME of the film. The main implication of the study is on how to achieve a watermark between the final programmed pattern and the original pattern, for the application of shape memory polymer in anti-counterfeiting label. Originality/value - Dual- and triple-SMEs were achieved in a PET film that is only 100 mu m in thickness, and the underlying mechanism for the difference between programming temperature and recovery temperature was discussed. For the novel application of triple-SME in anti-counterfeit label, the watermark during shape recovery in triple-SME can effectively prevent duplication.
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  • Precisie PID Temperature Control Based on LabVIEW

    Wang, Hong Yu   Lu, Xin   Tian, Jian  

    A PID temperature control system was designed with the LabVIEW graphical programming language and the PID toolkit. Data collection, PID control, data record and data check were experimented to the practicable instrument with the purchased programming power supply and data collection record system. Operate the hardware and software of the computer with the virtual instrument and realize the smooth control of the system temperature with the accuracy of 1 0/ 00.
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  • Edge-Magic Total Labellings of some Network Models

    Wang, Hong Yu   Yao, Bing   Yang, Chao   Yang, Si Hua   Chen, Xiang En   Yao, Ming   Zhao, Zhen Xue  

    It has been known that edge-symmetric graphs can be used as models of some scale-free networks, such as hierarchial networks and self-similar networks, such as graph colorings can be used for distinguishing objects of communication and informa-tion networks. We study the edge-magic property of edge-symmetric graphs, and construct graphs having edge-magic total labellings from smaller graphs.
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  • Abnormal Heat Triggered by Pressure Change in a D/Pd Gas-Loading System

    Wang, Hong Yu   Zhao, Xin Le   Shen, Bing Jun   Jin, Li Hong   Lu, Xin   Tian, Jian  

    This article by palladium deuterium gas-solid experimental system design, combined with the DH1716A program-controlled DC stabilized current supply and Keithley 2700 data acquisition and recording system, respectively at five different pressures, pressures triggered by experimental methods, making experiments of deuterated Palladium chemical reactions within the system, resulting in a tile level under different pressures is overheating.
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  • Research on Formula of Cyan UV Inkjet Ink

    Wang, Hong Yu   Chen, Yun Zhi   Zhang, Zheng Jian  

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  • Speed Sensorless Vector Control System of Induction Motor

    Wang, Hong Yu   Cai, Wen Long   Hou, Cheng Wei  

    This paper introduces a vector control system for speed sensorless induction motor drive, which we have recently developed. hi the introduce vector control system, one induction motor's rotor speed estimation method based on model reference adaptive identification theory is proposed. The induction motor speed identification system based on the proposed method can estimate the rotor speed of the induction motor. The speed sensorless vector control system based on proposed method in this paper was built with Simulink blocks in Matlab platform. The simulation results indicate that the proposed method could operate stably in whole range of speed with preferable identification precision of rotor speed.
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  • Excess Heat Triggered by Electrical Current in a D/Pd Gas-Loading System

    Wang, Hong Yu   Tian, Jian   Lu, Xin  

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  • Adsorption of Bisphenol-A by HDTMA Modified Clinoptilolite

    Wang, Hong Yu   Zhang, Hang Li   Zhao, Qian   Huang, Hui Fei  

    The adsorption of bisphenol-A (BPA) by hexadecyl trimethyl ammonium bromide (HDTMA) modified clinoptilolite was presented. In this paper, the equilibrium adsorption of BPA by HDTMA modified clinoptilolite was described by Freundlich isotherm with a correlation coefficient's square (R2) of 0.988. The kinetics of adsorption was defined by second-order kinetics with a rate constant (Kv) of 1.98 g/mg/h. The absorption rate was fast, and the liquid solid equilibrium was accomplished within 180 minutes. The effects of initial solution pH, and reaction temperatures had been estimated, showing that the adsorption was enhanced gradually by increasing pH value.
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  • Design and Simulation of Speed Sensorless Control System for Induction Motor

    Wang, Hong Yu   Peng, Yan   Hou, Yan  

    In this paper, a method for estimating induction motor's rotor speed is proposed. The proposed rotor speed estimation method is based on model reference adaptive identification theory. By applying the proposed method, the induction motor control system can estimate the rotor speed of the induction motor precisely. To improve the rotor speed estimation performance of the system, one input filter and one output filter are introduced into the speed sensorless control system. The introduced input filter and output filter enhance the estimation accuracy and improve the reliability and robustness of the system. The speed sensorless control system based on proposed method is built with Simulink blocks in Matlab platform. The simulation results indicate that the proposed method can operate stably in the whole range of speed with preferable identification precision of the rotor speed.
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  • On initial data of the monopole equation

    Wang, Hong Yu   Zhu, Xiu Juan  

    The space-time monopole equation is the reduction of anti-self-dual Yang-Mills equations in a"e(2,2) to a"e(2,1). This equation is a non-linear wave equation, and can be encoded in a Lax pair. An equivalent Lax pair is used by Dai and Terng to construct monopoles with continuous scattering data, and then the equation can be linearized by the scattering data, allowing one to use the inverse scattering method to solve the Cauchy problem with rapidly decaying small initial data. In this paper, we use the terminology of holomorphic bundle and transversality of certain maps, parametrized by initial data, to give more initial data, with which we can use scattering method to solve the Cauchy problem of the monopole equation up to gauge transformation.
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  • Analysis of Spare Model in Equipment System Based on Probability of Spares Sufficiency

    Wang, Hong Yu   Chen, Shou Hua   Wei, Yan Yan  

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  • Preparation Process of Metal Matrix Micro/Nano-Powders Reinforced by Nanometer Particles

    Wang, Hong Yu   Zuo, Dun Wen   Yu, Shou Xin   Zhang, Dan  

    The compound of micron powders and nanometer powders is a magnificent step in the application and development of metal matrix composite reinforced by nanometer particles. By taking nano-Al 2O 3 powders and Ni-based micron powders as the research object, the preparation process of metal matrix micro/nano-powders reinforced by nanometer particles with high energy ball-milling is discussed from three aspects: the additive process of nanometer powders, the additive content of nanometer powders, and the required ball-milling time in the paper. The results show that the additive process of nanometer powders which uses directly the dispersed uniformly nanometer suspensions as grinding medium can effectively decrease and avoid nanometer powders' agglomeration of composite powders. Nanometer particles are well distributed in the composite powders. The optimum additive content of nanometer powders is consistent with the theoretical model of mixture ratio, which is determined by the ratio of the average diameter of micron powders and nanometer powders and their density of corresponding solid materials. Meanwhile, the required ball-milling time for preparation of better uniformity composite powders is no more than 0.5 hr. This implies that the preparation process has a high productivity. Moreover, the preparation process is verified through other nanometer powders including nano-SiC powders and nano-CeO 2 powders.
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  • Effects of Processing Parameters on Energy Efficiency of Squash Presetting Laser Cladding

    Wang, Hong Yu   Zuo, D.W.   Chen, Y.J.   Ma, H.  

    The green presetting of powders was performed on the substrate by introducing a novel technique namely squash presetting method, and cladding coatings were prepared by crosscurrent CO 2 laser in this work. Based on the concept of laser energy efficiency which being accepted generally by insider, the energy efficiency of squash presetting laser cladding was determined. Meanwhile, effects of processing parameters including specific energy, laser power, scanning speed and spot diameter on energy efficiency were investigated through an orthogonal test. The results show that the energy efficiency increases at first and then decreases with the increase of specific energy, and the energy efficiency is relatively higher when laser specific energy ranged from 90 J/mm 2 to 100 J/mm 2. Among three single-factors, the effects of spot diameter on energy efficiency are most significant, laser power takes second place, and scanning speed comes next. It is considered through analysis that the relationship between energy efficiency and processing parameters is closely related to powders melting and heat-conduction course of squash presetting laser cladding.
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  • Labelling Properties of Models Related with Complex Networks Based on Constructible Structures

    Wang, Hong Yu   Yao, Bing   Yang, Chao   Yang, Si Hua   Chen, Xiang En  

    Network structure is irregular, complex and dynamically evolving in time. In the Internet of Things, we are ldquoThingsrdquo. Labelled graphs are used in researching areas of many networks, cryptography, computer science, biology, information etc. For simulating real networks we construct compound split-graphs and compound split-trees having particular labellings almost in arbitrary manners by our methods. We have several algorithms in polynomial time.
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  • AS160 deficiency causes whole-body insulin resistance via composite effects in multiple tissues

    Wang, Hong Yu   Ducommun, Serge   Quan, Chao   Xie, Bingxian   Li, Min   Wasserman, David H.   Sakamoto, Kei   Mackintosh, Carol   Chen, Shuai  

    AS160 (Akt substrate of 160 kDa) is a Rab GTPase-activating protein implicated in insulin control of GLUT4 (glucose transporter 4) trafficking. In humans, a truncation mutation (R363X) in one allele of AS160 decreased the expression of the protein and caused severe postprandial hyperinsulinaemia during puberty. To complement the limited studies possible in humans, we generated an AS160-knockout mouse. In wild-type mice, AS160 expression is relatively high in adipose tissue and soleus muscle, low in EDL (extensor digitorum longus) muscle and detectable in liver only after enrichment. Despite having lower blood glucose levels under both fasted and random-fed conditions, the AS160-knockout mice exhibited insulin resistance in both muscle and liver in a euglycaemic clamp study. Consistent with this paradoxical phenotype, basal glucose uptake was higher in AS160-knockout primary adipocytes and normal in isolated soleus muscle, but their insulin-stimulated glucose uptake and overall GLUT4 levels were markedly decreased. In contrast, insulin-stimulated glucose uptake and GLUT4 levels were normal in EDL muscle. The liver also contributes to the AS160-knockout phenotype via hepatic insulin resistance, elevated hepatic expression of phosphoenolpyruvate carboxykinase isoforms and pyruvate intolerance, which are indicative of increased gluconeogenesis. Overall, as well as its catalytic function, AS160 influences expression of other proteins, and its loss deregulates basal and insulin-regulated glucose homoeostasis, not only in tissues that normally express AS160, but also by influencing liver function.
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  • Nitrate Reduction by an Isolated Strain of Fe(II)-Dependent Autotrophic Denitrification Bacteria

    Wang, Hong Yu   Chen, Dan   Lv, Bin  

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