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Jean M.D.,Yung Ta Institute of Technology and Commerce | Li M.C.,Yung Ta Institute of Technology and Commerce | Li M.C.,Institute of Engineering Science and Technology | Chien T.H.,Kaohsiung Medical University | Chen C.J.,Yung Ta Institute of Technology and Commerce
Advanced Materials Research | Year: 2011

The paper describes response surface methodology (RSM) based on design of experiments and analysis of variance (ANOVA) as a statistical design while developing a robust plasma transfer arc (PTA)coating process. Based on ANOVA, The relative important parameters with respect to surface at hardness values were identified in the Taguchi design, where they were further used in predictors. In addition, we applied three-dimensional graphs in RSM to develop a robust PTA response surface yielding the desired-better area of a treated layer. In this study, a quadratic polynomial with a Box-Behnken design is utilized. The results reveal that RSM provides the effective methods as compared to the traditional trial-and-error method for exploring the effects of controlled factors on response. A very good agreement was observed, as evidenced by R-squared value, 90%, between the predicted and the experimental data, and its error percent is found to be approximately 3.801% in the PTA-coating process. It is clear that RSM model demonstrated better accuracy in predicting surface hardness for PTA-coating process. Accordingly, RSM based on design of experiments was used as statistical PTA-coating design tools combined with the hardness model. Device zone optimization and yield enhancement have been demonstrated. © (2011) Trans Tech Publications. Source

Han C.-L.,Institute of Engineering Science and Technology | Lay J.-J.,National Kaohsiung First University of Science and Technology | Shieh W.K.,University of Pennsylvania
Journal of Environmental Engineering (United States) | Year: 2015

The effectiveness of the Bacillus thermoamylovorans-enabled digested sludge in catalyzing cellulosic fermentation was tested under batch, mesophilic (40 plus or minus 1°C), unacclimatized, and high-loading (1.6 g cellulose in 80 mL aqueous solution) conditions. B. thermoamylovorans isolated from a molasses-fed anaerobic bioreactor was capable of quickly converting cellulose to alcohols and volatile organic acids (VOAs) at an overall rate of 0.32 g CODS/g VSS-day [volatile suspended solids (VSS), soluble chemical oxygen demand (CODS)] without producing H2. The digested sludge grown on pig manure, after an initial lag of 6 days, was able to produce H2, alcohols, and VOAs from cellulose at the rates of 0.021 L H2/g VSS-day and 0.16 g CODS/g VSS-day, respectively. The experiment which used a mixture of 0.014 g B. thermoamylovorans and 0.172 g digested sludge yielded the best results, with about 11-fold and sevenfold rate increases in H2 production and acid fermentation, respectively, compared to the digested sludge. Moreover, the initial lag of the B. thermoamylovorans-enabled digested sludge was reduced to about 3.0 days. In addition to H2, the main end products included ethanol (2,300 mg/L), acetic acid (2,300 mg/L), and butyric acid (3,600 mg/L). Under the conditions tested, the presence of cooperative interactions between B. thermoamylovorans and digested sludge was evident, provided that the mass of the former was small relative to that of the latter in the mixture cultures (i.e., 3-8%). © 2015 American Society of Civil Engineers. Source

Zubair M.,Polytechnic University of Turin | Zubair M.,Institute of Engineering Science and Technology | Francavilla M.A.,North China Electrical Power University | Zheng D.,Polytechnic University of Turin | And 2 more authors.
IEEE Transactions on Antennas and Propagation | Year: 2016

The integral equation analysis of large perfect electric conductor bodies is commonly formulated in terms of combined field integral equations (CFIE) that avoid spurious internal resonances. The dual-surface electric field integral equation (DSEFIE) is a less employed alternative approach; we discuss here how to cure its shortcomings and enhance its advantages over the CFIE for large bodies of nontrivial geometrical complexity. We study the convergence and accuracy of the DSEFIE also with respect to the current state of the art in the testing of the magnetic field integral equation. Examples of applications to large and realistic composite structures show the effectiveness of the proposed approach. © 2016 IEEE. Source

Liu Y.-T.,National Kaohsiung First University of Science and Technology | Li B.-J.,Institute of Engineering Science and Technology | Chiu N.-H.,National Kaohsiung First University of Science and Technology | Huang H.-J.,National Kaohsiung First University of Science and Technology
Materials Science Forum | Year: 2014

In this paper, a data acquisition system was constructed for examining grinding performance of a plunge grinding machine. The system is capable of simultaneously recording power assumption of main spindle, grinding normal force, and material removal of a workpiece. Through grinding experiments for cylindrical workpieces, parameters of grinding process including normal force, power consumption, and time history of diametric error were obtained. With the obtained parameters, the stiffness and time constant of the grinding system were being derived such that the performance of the grinding machine was well evaluated. The configured system described in this paper can be applied to improve grinding performance through further online compensation process. © (2014) Trans Tech Publications, Switzerland. Source

Dubey A.,Indian Institute of Technology Kanpur | Singh S.K.,Defense Research Development Organization | Tulachan B.,Indian Institute of Technology Kanpur | Roy M.,Institute of Engineering Science and Technology | And 4 more authors.
RSC Advances | Year: 2016

Sustainable charge storage devices require materials that are environmentally benign, readily moldable, easily synthesizable, and profitable for applications in the electronics industry. Nano iron pyrite (FeS2) is one such material, which is applicable in diverse areas like photovoltaic devices to seed dressing in agriculture. In this work, we propose an innovative application of nano FeS2viz., as a symmetric charge storage device that is flexible, portable, and lightweight; along with its fabrication details. The device consists of a (H3PO4)/polyvinyl alcohol (PVA) electrolyte gel sandwiched between two similar electrodes made up of FeS2/poly-aniline (PA), upon which graphite sheets are used as current collectors. Electrodes were characterized by XRD, FTIR and SEM. The device was calibrated by cyclic voltammetry and charge-discharge cycle. In its present laboratory prototype form, it powers solid-state electronic devices and electric motors. Further refinements of this device will open up new avenues in the field of sustainable charge storage devices and low power electronics. © The Royal Society of Chemistry 2016. Source

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