Changchun Institute of Technology
Changchun, China
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Sun H.-W.,Changchun Institute of Technology
Civil Engineering and Urban Planning IV - Proceedings of the 4th International Conference on Civil Engineering and Urban Planning, CEUP 2015 | Year: 2016

According to the change form of lifting displacement curve established on the lakeshore deepwater berth’s lifting displacement data observed and collected during the frosty period, this paper will analyze the influence of temperature on the lake ice frost-thawing situations and moisture contained in the foundation soil at the berth pile at different temperature periods, and reveal the berth lifting law when the conditions change in different temperature periods. © 2016 Taylor & Francis Group, London.

Zhao J.,Jilin University | Zhao J.,Changchun Institute of Technology | Liu L.,Jilin University
Knowledge-Based Systems | Year: 2011

The isomorphic relationship between indiscernibility relation in rough set theory and nominal scale in formal concept analysis was studied in this paper, upon which the conceptual elements were constructed as the basic units of internal elements in a knowledge-based complex system. The nature of the association between conceptual elements was studied in this paper, where the definition and properties of association intensity were provided. Furthermore, concept granules were constructed by studying the mapping between conceptual elements. The general forms of expansion and aggregation of concept granules were also given. The theories in the study laid the foundation for evolutionary analysis of knowledge-based complex system, and offered a referential model to the studies on knowledge evolution of ontology engineering. © 2011 Elsevier B.V. All rights reserved.

Su C.,Changchun University of Technology | Liu L.,Changchun Institute of Technology | Zhang M.,Northeast Normal University | Zhang Y.,Changchun University of Technology | Shao C.,Northeast Normal University
CrystEngComm | Year: 2012

In this work, Ag/TiO 2 nanoheterostructures with Ag nanocrystals well-grown on TiO 2-based nanofiber mats have been achieved by means of a novel and straighforward protocol combining an electrospinning technique and a solvothermal process. The experimental results indicated that the morphology and size of the secondary Ag nanostructures could be tailored by altering the experimental parameters, such as the reaction time and solvent as well as the reducing agent in the solvothermal treatment. The investigation of photocatalytic ability showed that the Ag/TiO 2 nanoheterostructures possess an excellent photocatalytic activity superior to the pure TiO 2 nanofiber for the degradation of Rhodamine B (RB) dye driven by visible light. The results indicated that Ag might be responsible for the visible light induced photocatalytic degradation by improving the photogenerated electrons and holes separation as well as charge migration, allowing both the electrons and holes to partake in the overall photocatalytic reaction. In addition, Ag has a good light absorption capability, extending the response of TiO 2 to visible light. Finally, the corresponding possible mechanism related to the photocatalytic performance of the Ag/TiO 2 nanoheterostructures was discussed in detail. Additionally, the separation and recovery process of the Ag/TiO 2 nanoheterostructures might be easily acheived by sedimentation without a decrease in the photocatalytic ability because of their particular one-dimensional nanostructured nature. © 2012 The Royal Society of Chemistry.

Wang K.,Changchun Institute of Technology | Wang K.,CAS Changchun Institute of Applied Chemistry
2011 IEEE/ICME International Conference on Complex Medical Engineering, CME 2011 | Year: 2011

In this paper, it was found that glucose oxidase (GOD) and cytochrome C (Cyt C) have been stably immobilized on the surface of glassy carbon electrode modified by chitosan (Chi) film. The sorption behavior of GOD and Cyt C immobilized on Chi matrix was characterized by environment scanning electron microscope (ESEM) which demonstrated that GOD and Cyt C have completely adsorbed the surface of Chi film. The direct electrochemistry and electrocatalysis performance of GOD and Cyt C on bienzymatic modified electrode were showed by cyclic voltammogram (CV) which indicated that GOD and Cyt C immobilized on Chi film display direct, quasi-reversible and surface-controlled electrochemical reaction containing proton exchange in 0.1M phosphate buffer solution (PBS) (pH 7.1), respectively. Furthermore, it was also discovered that GOD and Cyt C on modified electrode can show sensing performance to glucose and hydrogen peroxide, severally. Thus, single GOD-Cyt C/Chi/GC bienzymatic modified electrode is hopeful to be used in glucose biosensor or hydrogen peroxide biosensor. © 2011 IEEE.

Zheng L.-G.,Changchun Institute of Technology
Journal of Applied Optics | Year: 2014

In order to solve stitching testing of precise optical flat mirror, based on least squares fitting, we established reasonable stitching algorithms and mathematical models. In addition, relative program was written and a Φ120 mm precise flat mirror was tested with stitching method. A marked point was used to accomplish the alignments between subspertures. At the same time, relative stitching accuracy was analyzed based on the full aperture testing result and self-examination subaperture testing result. It is proved from the experiment results that there is no gap in the stitching result. The peak value(PV) and root-mean-square(RMS) errors between stitching results and full aperture testing results are 0.020 λ and 0.002 λ respectively. The stitching result is in consistent with the full aperture testing result and self-examination testing result, respectively, which proves the reliability and accuracy of the stitching.

Li S.,Changchun Institute of Technology
Advanced Materials Research | Year: 2012

An efficient near-infrared (NIR) quantum cutting (QC) nanophospors with Ce 3+, Yb 3+ codoped in CaF 2 had been synthesized by hydrothermal method and characterized by X-ray powder diffraction, scanning electron microscope, transmission electron microscopy, photoluminescence spectra and decay dynamics. The nanoparticles were uniform and monodisperse. Under the excitation of 5d level of Ce 3+, an intense NIR emission at 900-1050nm was observed which match to the energy of Si band gap of Si - based solar cells. In the Ce 3+, Yb 3+ codoped CaF 2, the lifetime of Ce 3+ decreases and the quantum efficiency (QE) increases with increasing Yb 3+ concentration. © (2012) Trans Tech Publications.

Wei D.,Changchun Institute of Technology
Journal of Networks | Year: 2010

There is too much iteration when using the traditional Floyd algorithm to calculate the shortest path, that is to say, the computation of traditional Floyd algorithm is too large for an urban road network with a large number of nodes. As for this disadvantage, the Floyd algorithm was improved and optimized further in this study; moreover, the improved Floyd algorithm was used to solve the shortest path problem in car navigation system, and it achieved good results. Two improvements were done: firstly, construct an iterative matrix for solving the shortest path, all the nodes in it were compared at first, and those nodes which have nothing to do with the results were removed, then search for the next node directly to reduce the frequency of iteration; Secondly, construct a serial number matrix for solving the shortest path, it was used to record the case of inserting node in the process of iteration. Finally, the frequency of iteration and the computational complexity were compared for both the traditional Floyd algorithm and the improved Floyd algorithm. The experimental results and analysis showed that the computational complexity of the improved Floyd algorithm has reduced to half of that of the traditional algorithm. What's more, by checking the iterative matrix and the serial number matrix, the shortest path can be found out simply, intuitively and efficiently. © 2010 Academy Publisher.

Wang X.-K.,Changchun Institute of Technology
Journal of Applied Optics | Year: 2013

On the basis of summing up conventional testing methods for convex mirror, a novel method for testing convex surfaces by subaperture stitching interferometry (SSI) was proposed. A sphere mirror is used as the reference surface, the phase distribution of each subaperture can be measured by the digital wavefront interferometer, and the full aperture surface map can be calculated by stitching several subapertures. The basic principle and theory of SSI were researched, and the stitching processing and prototype for testing convex spheres were devised and developed. A convex SiC sphere with the aperture of 300 mm was tested by SSI with 9 subapertures. For the validation, the sphere was also tested by large interferometer and beam expander, and the peak-valley(PV) and root-mean-square(RMS) residual errors between them were 0.102 λ and 0.009 λ, respectively (λ=632.8 nm).

Wang X.-K.,Changchun Institute of Technology
Journal of Applied Optics | Year: 2013

On the basis of summing up conventional linearity error testing for guideway, a novel method for testing linearity error of very long guideway by laser tracker is proposed. The basic principle and testing processing of the method are analyzed and researched. A long guideway of 20 m is measured by this method, the linearity error of each direction is 27 μm and 25 μm respectively. This method enlarges the ability of the laser tracker, it can test the linearity error of long guideway precisely and swiftly, and it can separate the linearity error of two directions, the longth of measurement guideway can reach 70 m, and the testing precision is 0.4 μm/m.

Jia K.,Changchun Institute of Technology
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

Coarse grain heat affected zone (CGHAZ) of Q460 weathering steel under different heat input conditions was simulated by thermal machine, mirostructure and the number, shape, distribution and size of M-A constitute and its impact on toughness of CGHAZ were analyzed. The results show that when t8/5 is smaller, mirostructure is composed of lath bainite and granular bainite, size of M-A constituent is smaller. When t8/5 is 100 s, the amount of lath bainite decrease, granular bainite content gradually increases, M-A appeas as massive, and its size grows up, so that the effective grain size increases, the toughness reduces. When t8/5 reaches to 150-200 s, even the microstructure is coarse, the amount of M-A component decrease and partly retained austenite exists that result in the toughness increase. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.

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