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Kasama Jarukumjorn - One of the best experts on this subject based on the ideXlab platform.

  • effect of flame retardants on flame retardant mechanical and thermal properties of sisal fiber polypropylene composites
    Composites Part B-engineering, 2014
    Co-Authors: Rachasit Jeencham, Nitinat Suppakarn, Kasama Jarukumjorn
    Abstract:

    Abstract A flame retardant efficiency of flame retardants; ammonium polyphosphate (APP), magnesium hydroxide (Mg(OH)2), zinc borate (Zb), and combination of APP with Mg(OH)2 and Zb in sisal fiber/polypropylene (PP) composites was investigated using a horizontal burning test and a vertical burning test. In addition, maleic anhydride grafted polypropylene (MAPP) was used as a compatibilizer to enhance the compatibility in the system; i.e. PP-fiber and PP-flame retardants. Thermal, mechanical, and morphological properties of the PP composites were also studied. Adding the flame retardants resulted in improved flame retardancy and thermal stability of the PP composites without deterioration of their mechanical properties. APP and combination of APP with Zb effectively enhanced flame retardancy of the PP composites. No synergistic effect was observed when APP was used in combination with Mg(OH)2. SEM micrographs of PP composites revealed Good Distribution of flame retardants in PP matrix and Good adhesion between sisal fiber and PP matrix.

  • mechanical properties and flammability of sisal pp composites effect of flame retardant type and content
    Composites Part B-engineering, 2009
    Co-Authors: Nitinat Suppakarn, Kasama Jarukumjorn
    Abstract:

    Abstract In this research, magnesium hydroxide (Mg(OH) 2 ) and zinc borate, as flame retardants, were incorporated into sisal/PP composites. Maleic anhydride grafted polypropylene was also used as a compatibilizer. Adding flame retardants into sisal/PP composites reduced burning rate and increased thermal stability of the composites. No synergistic effect was observed when both magnesium hydroxide and zinc borate were incorporated in the sisal/PP composites. In addition, the sisal/PP composites exhibited insignificant difference of shear viscosity at high shear rate indicating that types of flame retardants used in this study had no impact on the processability of the composites. Good Distribution of flame retardants and sisal fiber in PP matrix was also observed. All PP composites had lower impact strength than the neat PP. However, the sisal/PP composites with the addition of Mg(OH) 2 and zinc borate exhibited comparable tensile and flexural properties to the sisal/PP composites without adding those flame retardants. Therefore, the addition of Mg(OH) 2 and zinc borate enhanced flame retardancy of sisal/PP composites without sacrificing their mechanical properties.

Nitinat Suppakarn - One of the best experts on this subject based on the ideXlab platform.

  • effect of flame retardants on flame retardant mechanical and thermal properties of sisal fiber polypropylene composites
    Composites Part B-engineering, 2014
    Co-Authors: Rachasit Jeencham, Nitinat Suppakarn, Kasama Jarukumjorn
    Abstract:

    Abstract A flame retardant efficiency of flame retardants; ammonium polyphosphate (APP), magnesium hydroxide (Mg(OH)2), zinc borate (Zb), and combination of APP with Mg(OH)2 and Zb in sisal fiber/polypropylene (PP) composites was investigated using a horizontal burning test and a vertical burning test. In addition, maleic anhydride grafted polypropylene (MAPP) was used as a compatibilizer to enhance the compatibility in the system; i.e. PP-fiber and PP-flame retardants. Thermal, mechanical, and morphological properties of the PP composites were also studied. Adding the flame retardants resulted in improved flame retardancy and thermal stability of the PP composites without deterioration of their mechanical properties. APP and combination of APP with Zb effectively enhanced flame retardancy of the PP composites. No synergistic effect was observed when APP was used in combination with Mg(OH)2. SEM micrographs of PP composites revealed Good Distribution of flame retardants in PP matrix and Good adhesion between sisal fiber and PP matrix.

  • mechanical properties and flammability of sisal pp composites effect of flame retardant type and content
    Composites Part B-engineering, 2009
    Co-Authors: Nitinat Suppakarn, Kasama Jarukumjorn
    Abstract:

    Abstract In this research, magnesium hydroxide (Mg(OH) 2 ) and zinc borate, as flame retardants, were incorporated into sisal/PP composites. Maleic anhydride grafted polypropylene was also used as a compatibilizer. Adding flame retardants into sisal/PP composites reduced burning rate and increased thermal stability of the composites. No synergistic effect was observed when both magnesium hydroxide and zinc borate were incorporated in the sisal/PP composites. In addition, the sisal/PP composites exhibited insignificant difference of shear viscosity at high shear rate indicating that types of flame retardants used in this study had no impact on the processability of the composites. Good Distribution of flame retardants and sisal fiber in PP matrix was also observed. All PP composites had lower impact strength than the neat PP. However, the sisal/PP composites with the addition of Mg(OH) 2 and zinc borate exhibited comparable tensile and flexural properties to the sisal/PP composites without adding those flame retardants. Therefore, the addition of Mg(OH) 2 and zinc borate enhanced flame retardancy of sisal/PP composites without sacrificing their mechanical properties.

Yongqin Huang - One of the best experts on this subject based on the ideXlab platform.

  • a novel differential evolution algorithm based on ɛ domination and orthogonal design method for multiobjective optimization
    International Conference on Evolutionary Multi-criterion Optimization, 2007
    Co-Authors: Zhihua Cai, Wenyin Gong, Yongqin Huang
    Abstract:

    To find solutions as close to the Pareto front as possible, and to make them as diverse as possible in the obtained non-dominated front is a challenging task for any multiobjective optimization algorithm.∈-dominance is a concept which can make genetic algorithm obtain a Good Distribution of Pareto-optimal solutions and has low computational time complexity, and the orthogonal design method can generate an initial population of points that are scattered uniformly over the feasible solution space.In this paper, combining Ɛ-dominance and orthogonal design method, we propose a novel Differential Evolution (DE) algorithm for multiobjective optimization. Experiments on a number of two- and three-objective test problems of diverse complexities show that our approach is able to obtain a Good Distribution with a small computational time in all cases. Compared with several other state-of-the-art evolutionary algorithms, it achieves not only comparable results in terms of convergence and diversity metrics, but also a considerable reduction of the computational effort.

Rajkumar Buyya - One of the best experts on this subject based on the ideXlab platform.

  • A Particle Swarm Optimization-Based Heuristic for Scheduling Workflow Applications in Cloud Computing Environments
    2010 24th IEEE International Conference on Advanced Information Networking and Applications, 2010
    Co-Authors: Suraj Pandey, Sanjeela Guru, Linlin Wu, Rajkumar Buyya
    Abstract:

    Cloud computing environments facilitate applications by providing virtualized resources that can be provisioned dynamically. However, users are charged on a pay-per-use basis. User applications may incur large data retrieval and execution costs when they are scheduled taking into account only the `execution time'. In addition to optimizing execution time, the cost arising from data transfers between resources as well as execution costs must also be taken into account. In this paper, we present a particle swarm optimization (PSO) based heuristic to schedule applications to cloud resources that takes into account both computation cost and data transmission cost. We experiment with a workflow application by varying its computation and communication costs. We compare the cost savings when using PSO and existing `Best Resource Selection' (BRS) algorithm. Our results show that PSO can achieve: (a) as much as 3 times cost savings as compared to BRS, and (b) Good Distribution of workload onto resources.

M Esmailzadeh - One of the best experts on this subject based on the ideXlab platform.

  • microstructure and mechanical properties of cu sic metal matrix composite fabricated via friction stir processing
    Materials & Design, 2014
    Co-Authors: H R Akramifard, M Shamanian, M Sabbaghian, M Esmailzadeh
    Abstract:

    Abstract In the present investigation, pure Cu sheets were reinforced with 25 μm SiC particles to fabricate a composite surface layer by friction stir processing (FSP). In order to improve Distribution of reinforcing SiC particles, a net of holes were designed by drill on the surface of pure Cu sheet. For evaluation of microstructure, Optical Microscope (OM) and Scanning Electron Microscope (SEM) were used. Microstructural observation confirmed fine and equiaxed grains in the stir zone (SZ) and showed that SiC particles act as heterogeneous nucleation sites in the dynamic recrystallization of Cu grains. Moreover, agglomeration of particles was not observed and fine particles had a Good Distribution in SZ. In the SEM micrographs, porosities were detected as microstructure defects. Microhardness measurements showed that surface hardness was two times as high as that of substrate. The rotational wear tests demonstrated that use of SiC particles enhanced wear resistance and increased average friction coefficient of pure Cu. No intermetallic compound was found in Cu/SiC composite as revealed by XRD analysis.