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  • Trans Tech Publications, Ltd.  (700)
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  • Trans Tech Publications, Ltd.  (700)
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  • 1
    Online Resource
    Online Resource
    The Setting and Scheduling of the Traffic Patrol Service Platform
    Trans Tech Publications, Ltd. ; 2012
    In:  Applied Mechanics and Materials Vol. 209-211 ( 2012-10), p. 916-920
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 209-211 ( 2012-10), p. 916-920
    Abstract: Based on the data and assumptions of Modeling Problem B in the 12th National Mathematical Contest, and through building the models, this paper studies the node allocation in the traffic patrol service platform jurisdiction, the full and fast blockade of the platform scheduling, a reasonable increase of the service platform in the blind area , the evaluation of the service platform, and the best design of the police lockdown plan. Furthermore, combined with the analysis of the police time, the balanced degree and effective coverage, the model is optimized.
    Type of Medium: Online Resource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.209-211
    DOI: 10.4028/www.scientific.net/AMM.209-211.916
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2251882-4
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  • 2
    Online Resource
    Online Resource
    Influence of La〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Addition on Microstructure and Mechanical Properties of Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Ceramics
    Trans Tech Publications, Ltd. ; 2019
    In:  Materials Science Forum Vol. 956 ( 2019-6), p. 69-77
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 956 ( 2019-6), p. 69-77
    Abstract: In this paper, alumina ceramics were prepared with alumina powder and lanthanum nitrate. The influence of La 2 O 3 on the microstructure and properties of alumina ceramics were studied. The result showed that the addition of La 2 O 3 contributed to the mechanical property of the samples. The alumina ceramics with adding of 0.05wt% La 2 O 3 sintered at 1490°C had the best mechanical properties. And the flexural strength, fracture toughness of the ceramics could reach 571.902MPa and 5.82MPa•m 1/2 ，which were improved by 37.55% and 10.65% respectively compared with the alumina ceramics without La 2 O 3 . Besides, the average grain size of alumina ceramic is about 2.8μm, and the effect of inhibition on grain growth of alumina ceramics was obvious.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.956
    DOI: 10.4028/www.scientific.net/MSF.956.69
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2019
    detail.hit.zdb_id: 2047372-2
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  • 3
    Online Resource
    Online Resource
    A Correlation Analysis Model of Fault Location of Distribution System Based on RS-IA Data Mining
    Trans Tech Publications, Ltd. ; 2017
    In:  Applied Mechanics and Materials Vol. 863 ( 2017-2), p. 345-354
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 863 ( 2017-2), p. 345-354
    Abstract: Fault location is an effective way to ensure quickly power recovery after a failure in power distribution system. Bad operation environment of FTU, damaged elements or lost information usually cause variations in fault information for correlation analysis in fault location of power distribution system. A data mining (DM) correlation analysis model based on rough sets (RS) theory and immune algorithm (IA) is proposed in this paper. Firstly, using RS theory to extract domain knowledge, a set of the given variant fault pattern is converted into a decision table in RS. Secondly, an attribute reduction of the decision table is made by using the IA theory, and the intrinsic correlation rules between input vector (condition attribute) and output vector (decision attribute) are mined. Then, the data mining method is used to deal with the distortion of FTU real-time input information. According to the current limit information sequence of section switches, line fault states in each section are judged to realize the fault location in power distribution network. Finally, the feasibility and effectiveness of the fault location model of distribution network based on RS-IA data mining model is verified by simulation.
    Type of Medium: Online Resource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.863
    DOI: 10.4028/www.scientific.net/AMM.863.345
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2017
    detail.hit.zdb_id: 2251882-4
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  • 4
    Online Resource
    Online Resource
    Reliability Design of Crane Lattice Jib Based on Response Surface Method
    Trans Tech Publications, Ltd. ; 2014
    In:  Applied Mechanics and Materials Vol. 687-691 ( 2014-11), p. 243-248
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 687-691 ( 2014-11), p. 243-248
    Abstract: The failure path of large complex steel structure systems for lattice jib cranes is investigated in this paper. Considering the lack of an explicit function expression in the study of reliability, a method based on a modified response surface method is proposed to quantify the reliability index and the failure probability, capitalizing on the linear-approximated iteration and the difference approach rather than the differential approach in solving nonlinear equations. The major failure path is determined through the analysis of the multiple failure probabilities. The main failure mode of lattice jib cranes is a failure in stability, not a failure in strength based on a comparison of the failure probabilities of both stability failures and strength failures. And the failure path is substantially a rearrangement of the hazardous components and the failure path of components with similar probabilities and close locations varies only in that these components break at distinct starting positions. Finally a proposal is put forward to heighten in engineer practices the security reserves of hazardous components to achieve high reliability of an overall system.
    Type of Medium: Online Resource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.687-691
    DOI: 10.4028/www.scientific.net/AMM.687-691.243
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2251882-4
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  • 5
    Online Resource
    Online Resource
    The Progress of Catalyst for Cyclohexane Dehydrogenation Processes
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 953-954 ( 2014-6), p. 1261-1268
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 953-954 ( 2014-6), p. 1261-1268
    Abstract: Cyclohexane dehydrogenation is an important process in the petrochemical industry, chemical raw material such as cyclohexanol, cyclohexanone,benzene and cyclohexene can be produced from which.Divided cyclohexane dehydrogenation into catalytic dehydrogenation or oxidative dehydrogenation, homogeneous or heterogeneous reaction. Summarized vary catalysts, active constituent and process conditions in dehydrogenation process.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.953-954
    DOI: 10.4028/www.scientific.net/AMR.953-954.1261
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2265002-7
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  • 6
    Online Resource
    Online Resource
    Preparation and Properties of Cotton Fiber/Poly(lactic acid) Composites
    Trans Tech Publications, Ltd. ; 2014
    In:  Materials Science Forum Vol. 789 ( 2014-4), p. 100-105
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 789 ( 2014-4), p. 100-105
    Abstract: In order to improve the mechanical properties of poly (lactic acid) (PLA), cotton fiber/PLA composites were prepared by melting compounding and injection molding. The effects of cotton fiber content and coupling agent on mechanical properties, crystalline behavior and interface morphology of the composites were studied by universal testing machine, DSC and SEM, respectively. The results showed that the crystallinity of the composites increased gradually with the increase of cotton fiber content, whereas the mechanical properties of the composites increased firstly and then decreased with further addition of cotter fiber. The composite with 20wt% cotton fiber had an optimal mechanical performance. In addition, with the incorporation of 1wt% coupling agent, the interfacial adhesion between cotton fiber and PLA improved obviously, and the mechanical properties of the composites increased accordingly. Compared with the neat PLA, the tensile strength, flexural strength, flexural modulus and impact strength of the resultant composites were increased by 66.0%, 27.4%, 45.8% and 60.4%, respectively.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.789
    DOI: 10.4028/www.scientific.net/MSF.789.100
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2047372-2
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  • 7
    Online Resource
    Online Resource
    Study in Kinetics of Barium Sulfate Crystallization Process of Oilfield Injection
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 962-965 ( 2014-6), p. 757-761
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 962-965 ( 2014-6), p. 757-761
    Abstract: With conductivity measurement in different concentrations of barium chloride, sodium sulfate, sodium chloride solution, their concentration-conductivity equation is obtained. Through mathematical conversion, the relation between sulfuric acid root ion in the solution, barium ion conductivity and the concentration is showed as: X=4.1744×10 -6 Y-6.8544×10 -5 ,which is used to reflect the undissolved salt barium sulfate crystallization in the solution. Conductivity online measuring device is established, which can Intermittently test barium chloride, sodium sulfate solution of different concentrations, and detect the change of electrical conductivity in the process of crystallization of homogeneous barium sulfate in real-time. the different stages of crystallization process is determined by analysis of the conductivity curve. Through data processing to concert concentration into conductivity, so that the kinetic equation of barium sulfate crystallization process are obtained.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.962-965
    DOI: 10.4028/www.scientific.net/AMR.962-965.757
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2265002-7
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  • 8
    Online Resource
    Online Resource
    Prediction of the Residual Stress in Grind-Hardening with Thermal-Mechanical-Phase Transformation Stress Coupled Analysis
    Trans Tech Publications, Ltd. ; 2009
    In:  Materials Science Forum Vol. 626-627 ( 2009-8), p. 345-350
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 626-627 ( 2009-8), p. 345-350
    Abstract: Grind-hardening is a type of composite technology, which utilizes the dissipated heat in the grinding zone for hardening of the workpiece surface layer. The temperature of the workpiece surface, when heated by the grinding, is higher than the austenitizing temperature for short time, then it is lowered by quick cooling causing martensitic transformation to happen in the surface layer of the workpiece. The residual stress is formed by the thermal stress, phase transformation stress and mechanical stress in the grind-hardening layer. In this paper, the forming mechanism of the residual stress in grind-hardening technology is analyzed in theory; the residual stress field in the surface layer is calculated by the finite element, according to changes in the specific volume of the microstructure, the temperature field and the temperature history of the surface layer at different depths. The temperature field is achieved by computer simulation technology. The result of residual stress calculations indicates that the change tendency of the grind-hardening residual stress in the finite element analysis is consistent with the experiments.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.626-627
    DOI: 10.4028/www.scientific.net/MSF.626-627.345
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2009
    detail.hit.zdb_id: 2047372-2
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  • 9
    Online Resource
    Online Resource
    Study on Equivalent Viscous Damping of Aeolian Vibration for Transmission Line by AACSR-400 Steel Core Aluminum Alloy Wire
    Trans Tech Publications, Ltd. ; 2016
    In:  Key Engineering Materials Vol. 723 ( 2016-12), p. 94-99
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 723 ( 2016-12), p. 94-99
    Abstract: To ensure its operational security, it is important to study the vibration state of transmission line. The equivalent viscous damping of aero-vibration for a large-span overhead conductor is obligated to be determined. In this paper, the damping characteristics of conductor by AACSR-400 steel core aluminum alloy wire are studied by use of energy balance principle. Based on the Diana wind energy curve and equivalent viscous damping, the relationship between frequency and damping ratio is conducted and discussed. Furthermore, a numerical simulation by ANSYS is performed to verify the validity of the equivalent damping coefficient and equivalent damping ratio with the same material parameters. Study shows that the result of finite element method by ANSYS is consistent well with that by energy balance principle.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.723
    DOI: 10.4028/www.scientific.net/KEM.723.94
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2016
    detail.hit.zdb_id: 2073306-9
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  • 10
    Online Resource
    Online Resource
    Study on Hardness Depth Variation of Different Grinding Zone in Grind-Hardening
    Trans Tech Publications, Ltd. ; 2007
    In:  Advanced Materials Research Vol. 24-25 ( 2007-9), p. 333-336
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 24-25 ( 2007-9), p. 333-336
    Abstract: The experiments are performed to study the hardness layer depth at work piece different surface zone in grinding. The result is that hardness layer depth is various at work piece different surface zone. The hardness layer depth is thinner at cutting-in grinding zone, deeper at middle grinding zone and deepest at cutting-off grinding zone. In order to analyze the cause of hardness depth variation, the grinding temperature field is simulated by means of finite element method. From the temperature field and heat flux simulation, the cause of the hardness depth variation is that the grinding heat flux is variable at different grinding zone along the work piece surface in grind-hardening. At cutting-in zone, most of grinding heat flows into the front-below work piece part inverse to table speed, the depth that temperature of surface layer higher than austenite temperature is thin and there is slim martensite transformation layer. At middle zone, the temperature of surface layer is higher than austenite temperature because of grinding heat accumulated in the surface layer, and martensite transformation takes place after cooling. At cutting-off zone, most of grinding heat flows into the below work piece part because of work piece boundary, and hardness depth is deeper than that at middle zone.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.24-25
    DOI: 10.4028/www.scientific.net/AMR.24-25.333
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2007
    detail.hit.zdb_id: 2265002-7
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