Jilin Institute of Chemical Technology

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Yang W.,Jilin Institute of Chemical Technology
Chemical Engineering Transactions | Year: 2016

In order to forecast the quality of precision press-fit assembly, the press-fit curve and maximum press-mounting force for microparts' assembly were researched with FEA (finite element analysis) and experimental method. The available method at present is random sampling method. The method is high-cost and destructive method for precision press-fit assembly. The geometric model of micropart was built in three dimensional and its FEA model then built based on it in ANSYS Workbench. The press-fit process was investigated in detail and experiment for validated. The results show that the difference between press-fit curves obtained from FEA and these obtained from experimental method is relatively small. In addition, the deviation between maximum press-mounting force obtained from FEA and these obtained from experimental method is 3.0%. According to the compared results, the press-fit curve and maximum press-mounting force can be utilized for predicting quality of press-fit assembly. Copyright © 2016, AIDIC Servizi S.r.l.


Xiao T.,Jilin Institute of Chemical Technology
RISTI - Revista Iberica de Sistemas e Tecnologias de Informacao | Year: 2016

The intervening of network media for international cultural transmission has changed the current structure of cultural transmission and brought the transnational cultural communication into the digital age. In view of the long history of cultural communication between China and South Korea, network media provides a new opportunity for China and South Korea's cultural communication with its strong technical advantages, Under the historical background that in years of 2016 is the 24th Anniversary of the establishment of China-South Korea diplomatic Relations as well as the year of Sino-Korea exchange, according to the unique differences between Chinese and Korean people in the network cultural communication, taking the cultural communication between China and Korea as the research object, from the perspective of network transmission, the paper carries on the rational thinking and analysis to China and South Korea's cultural communication in network media environment, and discusses the influence and effect of network transmission on cross-cultural communication. The study points out that democracy and freedom in cyberspace make cultural communication in cyberspace more creative, cultural communication need more interaction in the network media environment. In addition, cultural communication between China and South Korea need to seek common ground while reserving differences, and try to find common ground. Between different cultures actively engage in exchanges and dialogue, mutual communication, learn from other culture's positive factors, mutual complementarity, mutual blending, so as to achieve diversified exchange development. © AISTI 2016.


Zhao C.,Jilin Institute of Chemical Technology
RISTI - Revista Iberica de Sistemas e Tecnologias de Informacao | Year: 2016

As the key to ensure the quality of higher education, the ideological and political education of college students is of great significance to improving the comprehensive quality and competitiveness of top talents so that they can better service the society and promote social development. Through analysis of the problems in the performance evaluation of college students' ideological and political education, this paper unveils an improved performance evaluation index system and fuzzy evaluation model. Firstly, the author discusses the perspective of constructing the evaluation index system, and outlines the perspective of constructing the performance evaluation index system of ideological and political education; secondly, the author selects evaluation indices by analyzing the principle of index selection, and constructs a hierarchal performance evaluation index system of college students' ideological and political education on the basis of the selected indices; thirdly, based on the theory of fuzzy mathematics, the author establishes a fuzzy evaluation model of college students' ideological and political education which gives full consideration to the evaluation indices, realizing the quantitative analysis of the performance of college students' ideological and political education; finally, the author summarizes the features and looks at the prospects of the evaluation index system and the evaluation model. © AISTI 2016.


Jiang W.,Jilin Institute of Chemical Technology | Jin F.-L.,Jilin Institute of Chemical Technology | Park S.-J.,Inha University
Journal of Industrial and Engineering Chemistry | Year: 2012

This study examined the thermo-mechanical behavior of epoxy resins/nano-Al 2O 3 composites including the curing behavior, thermal stability, dynamic mechanical properties and thermal mechanical properties. The DSC curve peak temperature of the composites was decreased by the addition of nano-Al 2O 3. The thermal stability of the composites was similar to that of the neat epoxy resins. Dynamic mechanical analysis (DMA) indicated the glass transition temperature of the composites to be approximately 11°C higher than that of the neat epoxy resins. The coefficient of thermal expansion (CTE) of the composites decreased with increasing nano-Al 2O 3 content. © 2011 The Korean Society of Industrial and Engineering Chemistry.


Lu D.-Y.,Jilin Institute of Chemical Technology | Yue Y.,Jilin Institute of Chemical Technology | Sun X.-Y.,Jilin Institute of Chemical Technology
Journal of Alloys and Compounds | Year: 2014

(Ba1-xLax)(Ti1- x/2Cax/2)O3 (0.03 ≤ x ≤ 0.06) (BLTC) ceramics were prepared using a mixed oxides method. The structure, microstructure, and dielectric properties of BLTC were investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, atomic force microscope, and dielectric measurements. Both symmetric (2 0 0) XRD peak indicative of cubicity and sharp 308 cm-1 Raman band indicative of tetragonality are characteristics of pseudo-cubic symmetry of BLTC. The unit cell volume of BLTC increased linearly with x, satisfying Vegard's law. A strong "Raman charge effect" appeared at 836 cm-1 because of the aliovalent double substitution in BLTC. The x = 0.03 sample because of its higher permittivity (ε' = ∼2000) and lower loss (tan δ < 0.04) is a novel dielectric for X7R applications. The formation of LaBa-CaTi″-LaBa defect complexes was responsible for the dielectric-temperature stability of BLTC. © 2013 Elsevier B.V. All rights reserved.


Yu J.,Jilin Institute of Chemical Technology
Proceedings - International Conference on Electrical and Control Engineering, ICECE 2010 | Year: 2010

The series resonant converter is a kind of DC to DC converter. The paper introduces the principle of the half bridge series resonant converter and the application of the half bridge series resonant converter in laser power supply. The series resonant converter has the high converting frequency and its output waveform comes near to the sine wave. Like the constant current resource, the series resonant converter also has the feature of high charging efficiency so that it is used as the charging circuit widely in the laser power supply. © 2010 IEEE.


Jin F.-L.,Jilin Institute of Chemical Technology | Park S.-J.,Inha University
Polymer Degradation and Stability | Year: 2012

Epoxy resin/filler hybrid composites were prepared by the melt blending of diglycidylether of bisphenol- A (DGEBA), as the epoxy resin, with nano-Al 2O3 or nano-SiC particles, as the nanoscaled fillers. The thermal properties, such as the curing behavior, thermal stability, dynamic mechanical properties, and thermal mechanical properties of the DGEBA/nano-Al2O3 and DGEBA/nano-SiC composites were examined using a range of techniques. As a result, the DSC curve peak temperature of both composites decreased with increasing filler content. The integral procedure decomposition temperature increased from 630 °C to 853 °C for DGEBA/nano-Al2O3 composite and 858 °C for DGEBA/nano-SiC composite. The char yield at 800 °C increased from 14.3% to 26.2-26.6% for both composites. Both composites had a 10 °C higher glass transition temperature than the neat epoxy resin. The coefficient of thermal expansion of both composites at the glassy and rubbery regions decreased with increasing filler content. © 2012 Elsevier Ltd. All rights reserved.


Gao X.,Jilin Institute of Chemical Technology
Proceedings - International Conference on Artificial Intelligence and Computational Intelligence, AICI 2010 | Year: 2010

In this paper, a constrained robust guaranteed cost tracking scheme for Wheeled Moving Robot (WMR) with actuator saturations is proposed. First, tracking error dynamics of WMR is represented by uncertain Tagaki-Sugeno (T-S) fuzzy model, where varying velocity in desired trajectory is look as uncertain parameter, so we can represent the T-S subsystem via Then constrained robust guaranteed controller in the form of state feedback is derived for each subsystem by solving LMI based semi-definite programming problems. Finally, The overall controller then is constructed in the framework of PDC and the Lyapunov stability of the closed-loop system is tested finally. Simulation results are given and discussed to validate the proposed scheme. © 2010 IEEE.


Shi J.Y.,Korea University | Shi J.Y.,Jilin Institute of Chemical Technology | Yi C.-W.,Sungshin Women's University | Kim K.,Korea University
Journal of Power Sources | Year: 2010

LiMn1.5Ni0.5O4 materials coated with AlPO4 are prepared by a sol-gel method with citric acid to improve their electrochemical performance; the physical and electrochemical properties are characterized by various analytical techniques. The coated AlPO4 layer completely covers the surfaces of the LiMn1.5Ni0.5O4 particles and the thickness of the coated layer is ∼15 nm. 1 wt.% AlPO4-coated LiMn1.5Ni0.5O4 has much lower surface and charge-transfer resistances and shows a higher lithium diffusion rate in comparison with the pristine sample. The modified material demonstrates dramatically enhanced electrochemical reversibility and stability under elevated temperature conditions. This is because the coated AlPO4 layer reduces the contact area between the electrode and electrolyte and suppresses the formation of undesirable solid electrolyte interface films. © 2010 Elsevier B.V. All rights reserved.


Lu D.-Y.,Jilin Institute of Chemical Technology | Cui S.-Z.,Jilin Institute of Chemical Technology | Cui S.-Z.,Northeast Normal University
Journal of the European Ceramic Society | Year: 2014

The point defects and the structural and dielectric properties of Dy-doped BaTiO3 ceramics prepared at 1400°C were investigated. The solubility of Dy in the self-compensation mode was determined to be x=0.07 for (Ba1-xDyx)(Ti1-xDyx)O3, and no EPR signals associated with the Dy3+ Kramers ion or the Ba and Ti vacancies were detected using the electron paramagnetic resonance (EPR) technique. As x increases, the dielectric behavior changed from a first-order phase transition to a diffuse phase transition to a Y7R dielectric-temperature stability. A strong EPR signal at g=1.974, which is rare among rare-earth-doped BaTiO3 ceramics appeared unexpectedly in the single-phase (Ba1-xDyx)Ti1-x/4O3 ceramics with deliberately designed Ti vacancies. This signal was attributed to ionized Ba vacancy defects. A preference for the self-compensation mode of Dy3+ ions is responsible for the appearance of Ba vacancies. The real formula of the nominal (Ba1-xDyx)Ti1-x/4O3 is expressed as (Ba1-xDy3x/4)(Ti1-x/4Dyx/4)O3. In addition, the defect chemistry is discussed. © 2014 Elsevier Ltd.

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