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Articles 21061 - 21090 of 27418

Full-Text Articles in Engineering

Review Of Carbon Materials Energy Storage Mechanism In Lead-Carbon Battery, Le-Ying Wang, Hao Zhang, Chen Hu, Shu-Kai Zhang, Hai-Lei Zhao, Gao-Ping Cao, Wen-Feng Zhang, Yu-Sheng Yang, Xiao-Kang Lai Oct 2014

Review Of Carbon Materials Energy Storage Mechanism In Lead-Carbon Battery, Le-Ying Wang, Hao Zhang, Chen Hu, Shu-Kai Zhang, Hai-Lei Zhao, Gao-Ping Cao, Wen-Feng Zhang, Yu-Sheng Yang, Xiao-Kang Lai

Journal of Electrochemistry

The traditional lead-acid batteries are mainly used for automobile and various internal combustion engine starting, wireless communication base stations and renewable energy storage; however, their negative plates are easily sulfated under partial-state-of-charge duty, then their charging capacity and cycle life are greatly reduced. Lead-carbon battery is a new type of lead-acid battery, in which a carbon material with high specific surface area and conductivity is added into a negative plate, and has excellent rate discharge performance and higher PSoC cycle life. Lead-carbon battery has a good application prospect in energy storage and hybrid electric vehicle, so these years the study …

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Determination Of Folic Acid By Composite Film Electrode Modified With Poly-Alizarin Red And Multi-Walled Carbon Nanotubes, Xue-Ping Du, Tong-Fang Lou, Ying Dong, Jian-Ying Qu Oct 2014

Determination Of Folic Acid By Composite Film Electrode Modified With Poly-Alizarin Red And Multi-Walled Carbon Nanotubes, Xue-Ping Du, Tong-Fang Lou, Ying Dong, Jian-Ying Qu

Journal of Electrochemistry

The novel modified electrode was fabricated by electropolymerizing alizarin red onto the surface of multi-walled carbon nanotubes on glassy carbon electrode surface, which exhibited good electrocatalytic activity for folic acid. The experimental results showed that the reduction peak current of folic acid at -0.63 V was linear to its concentration over the range of 1.25×10-6 ~ 4.00×10-5 mol·L-1 in the optimized experimental conditions (R = 0.9985). Test for recovery was carried out by standard addition method, and the recovery ratios were in the range of 92.0% ~ 102.0%. The modified electrode was prepared simply with excellent stability, …

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Electro-Catalytic Properties Of Β-Pbo2/Sb-Sno2/Ti Electrode On Phenol Oxidation, Peng Li, Yue-Min Zhao, Li-Zhang Wang, Yan-Le Zhang, Zhao-Qing Lu Oct 2014

Electro-Catalytic Properties Of Β-Pbo2/Sb-Sno2/Ti Electrode On Phenol Oxidation, Peng Li, Yue-Min Zhao, Li-Zhang Wang, Yan-Le Zhang, Zhao-Qing Lu

Journal of Electrochemistry

The combination technology of brush pyrolysis and electroplating was employed in the preparation of β-PbO2/Sb-SnO2/Ti electrode. X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) results showed that the Sb-SnO2 as an interlayer would restrain the formation of lead fluoride and the crystallization degree on the electrode surface could be as high as 100%. The grain size was calculated by Scherrer formula to be 25.2 nm and the agglomeration of lead dioxide was effectively eliminated. The potential span of diffusion control phase, oxygen evolution potential, Tafel slope for the β-PbO2/Sb-SnO2/Ti electrode during …

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Boosting Electrocatalytic Activity Of Nitrogen-Doped Graphene/Carbon Nanotube Composite For Oxygen Reduction Reaction, Yu Zhang, Jin-Song Hu, Wen-Jie Jiang, Lin Guo, Zi-Dong Wei, Li-Jun Wan Oct 2014

Boosting Electrocatalytic Activity Of Nitrogen-Doped Graphene/Carbon Nanotube Composite For Oxygen Reduction Reaction, Yu Zhang, Jin-Song Hu, Wen-Jie Jiang, Lin Guo, Zi-Dong Wei, Li-Jun Wan

Journal of Electrochemistry

Developing low-cost catalysts with high electrocatalytic activity for oxygen reduction reaction (ORR) has recently attracted much attention because the sluggish ORR currently limits the performance and commercialization of fuel cells and metal-air batteries as well. Nitrogen doped carbon materials have been considered as a promising candidate for the replacement of high-cost and scarce Pt-based catalysts although their electrocatalytic activity still needs to be much improved. In this work, an improved nitrogen-doped graphene/carbon nanotubes composite (N-rGO/CNT) was developed as an efficient ORR electrocatalyst. It was found that the ORR activity of N-rGO/CNT composite could be significantly enhanced by introducing iron in …

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Electrochemical Deposition Of Copt Alloy Thin Film And Its Abnormal Infrared Effects, Qing-Song Chen, Guo-Cong Guo, Shi-Gang Sun Oct 2014

Electrochemical Deposition Of Copt Alloy Thin Film And Its Abnormal Infrared Effects, Qing-Song Chen, Guo-Cong Guo, Shi-Gang Sun

Journal of Electrochemistry

Nanostructured CoPt alloy thin film was deposited on glassy carbon substrate (denoted as CoPt/GC) under cyclic voltammetric conditions. SEM studies demonstrated that the CoPt/GC was composed of nonuniform nanoparticles with an average size of 139 nm. The composition of the CoPt/GC was analyzed by energy dispersive X-ray spectroscopy (EDS), which depicts a Co:Pt ratio of ca. 3:5. In situ FTIR spectroscopy employing CO adsorption as a probe reaction revealed that the CoPt/GC exhibits abnormal infrared effects (AIREs). The unique anomalous IR features of CO adsorbed (COad) on CoPt/GC consist in the complete inversion of the COad IR …

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Recent Progress In Heteroatoms Doped Carbon Materials As A Catalyst For Oxygen Reduction Reaction, Wei Ding, Xue Zhang, Li Li, Zi-Dong Wei Oct 2014

Recent Progress In Heteroatoms Doped Carbon Materials As A Catalyst For Oxygen Reduction Reaction, Wei Ding, Xue Zhang, Li Li, Zi-Dong Wei

Journal of Electrochemistry

Developing catalytic materials for oxygen reduction reactions (ORR) with high performance and low cost has been one of the major challenges for large-scale applications of fuel cells. In this review, we summarize the recent progress in the heteroatoms doped carbon materials as a catalyst for the catalysis of ORR, with an emphasis on the universal origin of their catalytic mechanisms. The future prospects of the metal-free catalyst were to find precisely controlled doping methods, to explore the role of heteroatoms in the catalysis, and to generate more active catalysts with suitable nanostructure.

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Fabrication Of Pattern Of Graphene Oxide And Au Nanoparticles By Microcontanct Printing Technique, Wen-Hui Pang, Xiao-Jian Xiao, Meng-Wei Ye, Kai-Chao Deng, Jing Tang Oct 2014

Fabrication Of Pattern Of Graphene Oxide And Au Nanoparticles By Microcontanct Printing Technique, Wen-Hui Pang, Xiao-Jian Xiao, Meng-Wei Ye, Kai-Chao Deng, Jing Tang

Journal of Electrochemistry

Graphene oxide (GO) was prepared by modified Hummers method. Using the GO solution as "ink", Au nanoparticles (AuNPs) and GO were transferred to the surface of ITO substrate modified with (3-aminopropyl) triethoxysilane (APTES/ITO) in a sequence. The transferred AuNPs and GO could form a uniform and dense composite pattern which was characterized by FE-SEM and AFM. Moreover, using the APTES/ITO substrate surface potential as zero, the sequences of the surface potential were APTES>GO>Au.

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Fabrication And Characterization Of The Ni-Scsz Composite Anodes With A Cu-Lscm-Ceo2 Catalyst Layer In The Thin Film Sofc, Yao Lv, Bo Huang, Xi-Zhi Gu, Chun-Yi Hou, Yi-Xing Hu, Xiao-Yin Wang, Xin-Jian Zhu Oct 2014

Fabrication And Characterization Of The Ni-Scsz Composite Anodes With A Cu-Lscm-Ceo2 Catalyst Layer In The Thin Film Sofc, Yao Lv, Bo Huang, Xi-Zhi Gu, Chun-Yi Hou, Yi-Xing Hu, Xiao-Yin Wang, Xin-Jian Zhu

Journal of Electrochemistry

Solid oxide fuel cell (SOFC) directly operating on hydrocarbon without external reforming has the potential of greatly speeding up the application of SOFCs for transportation. In this paper, a three-layer structure anode was fabricated by tape casting and screen printing method. The addition of Cu-LSCM-CeO2 to the supported anode surface presented better performance running on H2 and ethanol. The maximum power densities were 511 and 390 mW?cm-2, respectively, running on H2 and ethanol at 750 °C. No significant degradation was observed on the anode. Consequently, the Cu-LSCM-CeO2 catalyst layer on the surface of the …

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Preparation And Electrochemical Behavior Of Pbo/Gn/Ac, Yun-Fang Gao, Yan-Ping Wang, Qiu-Shi Yao, Fu-Hua Wang, Dong-Lei Ren, Xin Xu Oct 2014

Preparation And Electrochemical Behavior Of Pbo/Gn/Ac, Yun-Fang Gao, Yan-Ping Wang, Qiu-Shi Yao, Fu-Hua Wang, Dong-Lei Ren, Xin Xu

Journal of Electrochemistry

The lead oxide/graphene/activated carbon (PbO/GN/AC) composite materials were prepared by impregnating commercial activated carbon and graphene in saturated lead nitrate solution followed by calcination. The structures and morphologies of the composite were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that PbO crystals (about 200 nm) were dispersed uniformly on the surface of activated carbon and graphene. Electrochemical data indicate that the composite exhibited good electrochemical performances. The PbO/GN/AC composite possessed the higher over-potential of hydrogen evolution and the high specific capacitance of 312.6 F·g-1, while the internal resistance …

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Electrochemical And Spectroscopic Studies Of Ethanol Oxidation On Nano-Cubic Pt Modified By Tin Adatoms, Lu Rao, Bin-Wei Zhang, Yan-Yan Li, Yan-Xia Jiang, Shi-Gang Sun Oct 2014

Electrochemical And Spectroscopic Studies Of Ethanol Oxidation On Nano-Cubic Pt Modified By Tin Adatoms, Lu Rao, Bin-Wei Zhang, Yan-Yan Li, Yan-Xia Jiang, Shi-Gang Sun

Journal of Electrochemistry

The nano-cubic Pt modified by tin (Sn) was synthesized and used to investigate the role of this adatom played in the ethanol oxidation. The onset potential of ethanol oxidation was significantly shifted negatively which can be forward about 300 mV when the coverage of Sn (θSn)was 0.9. The electrtochemical in situ FTIR result demonstrated that the amount of CO2 increased first, and then decreased with θSn increased, and reached the maximun when θSn was 0.38. Furthermore, the formation of acetic acid could be observed at very low potential (-0.05 V) after modifying Sn adatom, and the amount of acetic …

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Preparation Of Pt/Dna-Mwcnts/Gc Electrode And Its Electrocatalytic Activity Toward H2O2 Reduction, Li-Li Fan, Li-Na Wu, Zhi-Yu Qu, Dan-Feng Liu, Jun-Ming Zhang, Si-Ming Fan, You-Jun Fan Oct 2014

Preparation Of Pt/Dna-Mwcnts/Gc Electrode And Its Electrocatalytic Activity Toward H2O2 Reduction, Li-Li Fan, Li-Na Wu, Zhi-Yu Qu, Dan-Feng Liu, Jun-Ming Zhang, Si-Ming Fan, You-Jun Fan

Journal of Electrochemistry

The DNA-multi-walled carbon nanotubes (MWCNTs)/glassy carbon (GC) electrode was prepared by modifying the DNA functionalized MWCNTs composite on a GC electrode. A novel non-enzymatic H2O2 sensing electrode was fabricated by electrodepositing Pt nanoparticles on the DNA-MWCNTs/GC electrode. The modified electrodes were characterized by scanning electron microscope (SEM). The response properties of the sensing electrode to H2O2 were investigated by cyclic voltammetry and chronoamperometry. The results indicated that the sensing electrode exhibited a good linear relationship between response current and H2O2 concentration in the range of 0.04 ~ 18.07 mmol·L-1 with …

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On The Origin Of The Errors Of IK As Estimated From K-L Equation In Rotating Disk Electrode System, Wei Chen, Ling-Wen Liao, Zheng-Da He, Yan-Xia Chen Oct 2014

On The Origin Of The Errors Of IK As Estimated From K-L Equation In Rotating Disk Electrode System, Wei Chen, Ling-Wen Liao, Zheng-Da He, Yan-Xia Chen

Journal of Electrochemistry

Rotating disk electrode system is mainly used to study the kinetics of reactions whose reactants have very low solubility in the electrolyte. For an irreversible reaction, Koutecky-Levich equation (K-L Eq.) is frequently used to deduce the kinetic current ik). Since K-L Eq. is derived based on the assumption that a system should conform the steady-state diffusion conditions, the data recoded from the actual system which deviates from such a condition, great error may be induced for the ik estimated. In this work, polarization curves for oxygen reduction reaction at polycrystalline Pt electrode recorded in solutions with various …

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Improving Airplane Touchdown Control By Utilizing The Adverse Elevator Effect, Nihad E. Daidzic Ph.D., Sc.D. Oct 2014

Improving Airplane Touchdown Control By Utilizing The Adverse Elevator Effect, Nihad E. Daidzic Ph.D., Sc.D.

International Journal of Aviation, Aeronautics, and Aerospace

The main objective of this original research article is to understand the short-term dynamic behavior of the transport-category airplane during landing flare elevator control application. Increasing the pitch angle to arrest the sink rate, the elevator will have to produce negative lift to rotate the airplane’s nose upward. This has an immediate adverse effect of initially accelerating airplane downward. A mathematical model of landing flare based on the flat-Earth longitudinal dynamics of rigid airplane was developed which is realistic only on very short time-scales as pitch stiffness and damping were neglected. Pilot control scenarios using impulse and step elevator pull-up …

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Effect Of Plasticizer On Oxygen Permeability Of Cast Polylactic Acid (Pla) Films Determined Using Dynamic Accumulation Method, Kurniawan Yuniarto, Bruce A. Welt, Aris Purwanto, Hadi Karia Purwadaria, Ayman Abdellatief, Titi C. Sunarti, Setyo Purwanto Oct 2014

Effect Of Plasticizer On Oxygen Permeability Of Cast Polylactic Acid (Pla) Films Determined Using Dynamic Accumulation Method, Kurniawan Yuniarto, Bruce A. Welt, Aris Purwanto, Hadi Karia Purwadaria, Ayman Abdellatief, Titi C. Sunarti, Setyo Purwanto

Journal of Applied Packaging Research

Polylactic acid (PLA) is becoming an increasingly important biopolymer for packaging applications. PLA brittleness limits its applicability. This study evaluated PLA properties with increasing amounts of added polyethylene glycol (PEG) plasticizer. Oxygen transmission rate (OTR) of cast films was determined using the newly available Dynamic Accumulation (DA) method. Arrhenius temperature sensitivity of OTR and polymer Permeability was also determined. Permeability of neat PLA is 4.848 ml mm (STP)/m2 s kPa; hence, 4.84 ml mm (STP)/m2 s kPa, 4.07 ml mm (STP)/m2 s kPa and 5.42 ml mm (STP)/m2 s kPa by adding PEG 1 %, 5% …

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Nonlinear Wave Evolution Above Rectangular Submerged Structures, Jaw-Fang Lee, Lih-Fu Tu, Cheng-Chi Liu Oct 2014

Nonlinear Wave Evolution Above Rectangular Submerged Structures, Jaw-Fang Lee, Lih-Fu Tu, Cheng-Chi Liu

Journal of Marine Science and Technology

In this study, an analytic approach for the complete second-order solution proposed by Sulisz and Hudspeth [13] was applied to solve a problem of waves propagating over a rectangular submerged structure. In addition, nonlinear wave evolutions above the submerged structure were studied. The nonlinear problem was expressed up to the second-order boundary value problems by using a Taylor series expansion and the perturbation method. In solving the problem, the nonhomogeneous problem was divided into Stokes wave and free wave counterparts. The solutions of neighboring regions were combined and solved by applying kinematic and dynamic matching conditions. Convergence of the presented …

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Analytical Solution For Long-Wave Scattering By A Submerged Cylinder In An Axi-Symmetrical Pit, Huan-Wen Liu, Xiao-Ling Sun Oct 2014

Analytical Solution For Long-Wave Scattering By A Submerged Cylinder In An Axi-Symmetrical Pit, Huan-Wen Liu, Xiao-Ling Sun

Journal of Marine Science and Technology

This paper proposes an analytical solution to the long-wave equation for waves propagating over a submerged cylinder located in a pit. The pit was assumed to be axi-symmetrical and convex or concave in shape, which may represent a submerged sill being scoured at its toe. Techniques of variable separation and Taylor series expansion were applied to find the analytical solution. It is found that Longuet-Higgins’ classical analytical solutions for waves scattered by a submerged circular sill and by a submerged circular pit are actually special cases of the present analytical solution. By using this analytical solution, the influence of the …

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Analysis Of Rolled Piece Deformation In Straightening Process Using Fm-Bem, Hai-Lian Gui, Qiang Li, Yao Li, Pu Li, Qing-Xue Huang Oct 2014

Analysis Of Rolled Piece Deformation In Straightening Process Using Fm-Bem, Hai-Lian Gui, Qiang Li, Yao Li, Pu Li, Qing-Xue Huang

Journal of Marine Science and Technology

Rolled piece deformation in a straightening process is regarded as an inverse problem of the plate bending problem. The straightening force was obtained accurately by applying the fast multipole boundary element method (FM-BEM) to the plate bending problem. Furthermore, the straightening process of a nine-roller straightening roller system with a variable roller distance was simulated using numerical analysis, and a function describing the neutral layer offset was obtained from an analysis of FM-BEM results. In this paper, the principle stress values and neutral layer offset of the microunits in the tension and compression regions are discussed. It is concluded that …

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Simple Integral Fuzzy Control For Converters With Highly Nonlinear Dynamics, Kuang-Yow Lian, Chi-Wang Hong Oct 2014

Simple Integral Fuzzy Control For Converters With Highly Nonlinear Dynamics, Kuang-Yow Lian, Chi-Wang Hong

Journal of Marine Science and Technology

A simple integral Takagi-Sugeno (T-S) fuzzy control scheme suitable for many types of converters is proposed in this paper. A converter with highly nonlinear characteristics, called active high power factor correction (AHPFC), is taken as an example to show the control scheme. Indeed, we can derive a linear controller to achieve zero output regulation error for the AHPFC converter. First, we include an integral error signal to form an augmented system. After translating the coordinate to the regulated point, we obtain the stabilization model. The model-based fuzzy approach is then used to handle the nonlinear system. The system stability is …

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Magneto-Hydrodynamic Non-Newtonian Curved Circular Squeeze Films, Jaw-Ren Lin, Li-Ming Chu, Chi-Ren Hung, Rong-Fang Lu Oct 2014

Magneto-Hydrodynamic Non-Newtonian Curved Circular Squeeze Films, Jaw-Ren Lin, Li-Ming Chu, Chi-Ren Hung, Rong-Fang Lu

Journal of Marine Science and Technology

The squeeze film performances between curved circular plates lubricated with an electrically conducting non-Newtonian fluid in the presence of external magnetic fields are investigated in this paper. Based upon the magneto-hydrodynamic flow theory together with the Stokes microcontinuum theory, the magneto-hydrodynamic non-Newtonian Reynolds equation is derived and applied to predict the curved circular squeeze film behaviors. Comparing with the hydrodynamic Newtonian case, the squeeze film characteristics for curved circular plates are improved by the use of an electrically conducting non-Newtonian fluid in the presence of external magnetic fields. Numerical values of the load capacity and the approaching time are provided …

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An Application Of Space Syntax To Critical Working Space Analysis: The Case Of Building Construction, Li-Wen Wu, Sy-Jye Guo Oct 2014

An Application Of Space Syntax To Critical Working Space Analysis: The Case Of Building Construction, Li-Wen Wu, Sy-Jye Guo

Journal of Marine Science and Technology

The definition of critical space used in this paper is identical to the critical path definition employed in the critical path method (CPM). This definition implies that there is no extra floating space; thus, any conflict is expected to result in productivity loss. Space syntax is a theory developed to reveal the hidden interrelationships between spaces using architectural diagrams. Existing studies have indicated the potential for space syntax to identify critical spaces and to assist in reducing conflicts leading to productivity loss. However, there is not yet quantitative evidence demonstrating whether the quantitative parameters of relative convenience and relative control …

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A Residual-Norm Based Algorithm For Solving Determinate/Indeterminate Systems Of Non-Linear Algebraic Equations, Yung-Wei Chen Oct 2014

A Residual-Norm Based Algorithm For Solving Determinate/Indeterminate Systems Of Non-Linear Algebraic Equations, Yung-Wei Chen

Journal of Marine Science and Technology

In this paper, a residual-norm based algorithm (RNBA) is applied to solve determinate/indeterminate systems of nonlinear algebraic equations. The RNBA is derived from a manifold and defined in terms of a squared residual norm and a fictitious time variable, from which a robust iterative algorithm with either fixing or adjusting parameters can be obtained. Besides, some convergent indexes, such as manifold factor A0 and ratio of residual errors S, are defined to indicate the manifold attracting effect. Through the convergent indexes, the convergent mechanism of the RNBA displays a Hopf bifurcation when approximating the true solutions. Several numerical examples, including …

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Real-Time Load Balancing And Power Factor Correction Of Three-Phase, Four-Wire Unbalanced Systems With Dstatcom, Wei-Neng Chang, Kuan-Dih Yeh Oct 2014

Real-Time Load Balancing And Power Factor Correction Of Three-Phase, Four-Wire Unbalanced Systems With Dstatcom, Wei-Neng Chang, Kuan-Dih Yeh

Journal of Marine Science and Technology

This paper presents the design and implementation of a distribution-level static synchronous compensator (DSTATCOM) used for the real-time load compensation of three-phase, fourwire power distribution systems with unbalanced loads. First, use of the symmetrical components method derives a feedforward compensation scheme for the DSTATCOM. The system block diagram of the DSTATCOM is then built. A computer simulation is performed for preliminary verification. Finally, a hardware prototype is built using a TMS320C6711- based controller. Experimental results verify the functionality of the DSTATCOM.

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Analysis Of Rolled Piece Deformation In Straightening Process Using Fm-Bem, Hai-Lian Gui, Qiang Li, Yao Li, Pu Li, Qing-Xue Huang Oct 2014

Analysis Of Rolled Piece Deformation In Straightening Process Using Fm-Bem, Hai-Lian Gui, Qiang Li, Yao Li, Pu Li, Qing-Xue Huang

Journal of Marine Science and Technology–Taiwan

Rolled piece deformation in a straightening process is regarded as an inverse problem of the plate bending problem. The straightening force was obtained accurately by applying the fast multipole boundary element method (FM-BEM) to the plate bending problem. Furthermore, the straightening process of a nine-roller straightening roller system with a variable roller distance was simulated using numerical analysis, and a function describing the neutral layer offset was obtained from an analysis of FM-BEM results. In this paper, the principle stress values and neutral layer offset of the microunits in the tension and compression regions are discussed. It is concluded that …

Go to article

Nonlinear Wave Evolution Above Rectangular Submerged Structures, Jaw-Fang Lee, Lih-Fu Tu, Cheng-Chi Liu Oct 2014

Nonlinear Wave Evolution Above Rectangular Submerged Structures, Jaw-Fang Lee, Lih-Fu Tu, Cheng-Chi Liu

Journal of Marine Science and Technology–Taiwan

In this study, an analytic approach for the complete second-order solution proposed by Sulisz and Hudspeth [13] was applied to solve a problem of waves propagating over a rectangular submerged structure. In addition, nonlinear wave evolutions above the submerged structure were studied. The nonlinear problem was expressed up to the second-order boundary value problems by using a Taylor series expansion and the perturbation method. In solving the problem, the nonhomogeneous problem was divided into Stokes wave and free wave counterparts. The solutions of neighboring regions were combined and solved by applying kinematic and dynamic matching conditions. Convergence of the presented …

Go to article

Analytical Solution For Long-Wave Scattering By A Submerged Cylinder In An Axi-Symmetrical Pit, Huan-Wen Liu, Xiao-Ling Sun Oct 2014

Analytical Solution For Long-Wave Scattering By A Submerged Cylinder In An Axi-Symmetrical Pit, Huan-Wen Liu, Xiao-Ling Sun

Journal of Marine Science and Technology–Taiwan

This paper proposes an analytical solution to the long-wave equation for waves propagating over a submerged cylinder located in a pit. The pit was assumed to be axi-symmetrical and convex or concave in shape, which may represent a submerged sill being scoured at its toe. Techniques of variable separation and Taylor series expansion were applied to find the analytical solution. It is found that Longuet-Higgins’ classical analytical solutions for waves scattered by a submerged circular sill and by a submerged circular pit are actually special cases of the present analytical solution. By using this analytical solution, the influence of the …

Go to article

Simple Integral Fuzzy Control For Converters With Highly Nonlinear Dynamics, Kuang-Yow Lian, Chi-Wang Hong Oct 2014

Simple Integral Fuzzy Control For Converters With Highly Nonlinear Dynamics, Kuang-Yow Lian, Chi-Wang Hong

Journal of Marine Science and Technology–Taiwan

A simple integral Takagi-Sugeno (T-S) fuzzy control scheme suitable for many types of converters is proposed in this paper. A converter with highly nonlinear characteristics, called active high power factor correction (AHPFC), is taken as an example to show the control scheme. Indeed, we can derive a linear controller to achieve zero output regulation error for the AHPFC converter. First, we include an integral error signal to form an augmented system. After translating the coordinate to the regulated point, we obtain the stabilization model. The model-based fuzzy approach is then used to handle the nonlinear system. The system stability is …

Go to article

Magneto-Hydrodynamic Non-Newtonian Curved Circular Squeeze Films, Jaw-Ren Lin, Li-Ming Chu, Chi-Ren Hung, Rong-Fang Lu Oct 2014

Magneto-Hydrodynamic Non-Newtonian Curved Circular Squeeze Films, Jaw-Ren Lin, Li-Ming Chu, Chi-Ren Hung, Rong-Fang Lu

Journal of Marine Science and Technology–Taiwan

The squeeze film performances between curved circular plates lubricated with an electrically conducting non-Newtonian fluid in the presence of external magnetic fields are investigated in this paper. Based upon the magneto-hydrodynamic flow theory together with the Stokes microcontinuum theory, the magneto-hydrodynamic non-Newtonian Reynolds equation is derived and applied to predict the curved circular squeeze film behaviors. Comparing with the hydrodynamic Newtonian case, the squeeze film characteristics for curved circular plates are improved by the use of an electrically conducting non-Newtonian fluid in the presence of external magnetic fields. Numerical values of the load capacity and the approaching time are provided …

Go to article

An Application Of Space Syntax To Critical Working Space Analysis: The Case Of Building Construction, Li-Wen Wu, Sy-Jye Guo Oct 2014

An Application Of Space Syntax To Critical Working Space Analysis: The Case Of Building Construction, Li-Wen Wu, Sy-Jye Guo

Journal of Marine Science and Technology–Taiwan

The definition of critical space used in this paper is identical to the critical path definition employed in the critical path method (CPM). This definition implies that there is no extra floating space; thus, any conflict is expected to result in productivity loss. Space syntax is a theory developed to reveal the hidden interrelationships between spaces using architectural diagrams. Existing studies have indicated the potential for space syntax to identify critical spaces and to assist in reducing conflicts leading to productivity loss. However, there is not yet quantitative evidence demonstrating whether the quantitative parameters of relative convenience and relative control …

Go to article

A Residual-Norm Based Algorithm For Solving Determinate/Indeterminate Systems Of Non-Linear Algebraic Equations, Yung-Wei Chen Oct 2014

A Residual-Norm Based Algorithm For Solving Determinate/Indeterminate Systems Of Non-Linear Algebraic Equations, Yung-Wei Chen

Journal of Marine Science and Technology–Taiwan

In this paper, a residual-norm based algorithm (RNBA) is applied to solve determinate/indeterminate systems of nonlinear algebraic equations. The RNBA is derived from a manifold and defined in terms of a squared residual norm and a fictitious time variable, from which a robust iterative algorithm with either fixing or adjusting parameters can be obtained. Besides, some convergent indexes, such as manifold factor A0 and ratio of residual errors S, are defined to indicate the manifold attracting effect. Through the convergent indexes, the convergent mechanism of the RNBA displays a Hopf bifurcation when approximating the true solutions. Several numerical examples, including …

Go to article

Real-Time Load Balancing And Power Factor Correction Of Three-Phase, Four-Wire Unbalanced Systems With Dstatcom, Wei-Neng Chang, Kuan-Dih Yeh Oct 2014

Real-Time Load Balancing And Power Factor Correction Of Three-Phase, Four-Wire Unbalanced Systems With Dstatcom, Wei-Neng Chang, Kuan-Dih Yeh

Journal of Marine Science and Technology–Taiwan

This paper presents the design and implementation of a distribution-level static synchronous compensator (DSTATCOM) used for the real-time load compensation of three-phase, fourwire power distribution systems with unbalanced loads. First, use of the symmetrical components method derives a feedforward compensation scheme for the DSTATCOM. The system block diagram of the DSTATCOM is then built. A computer simulation is performed for preliminary verification. Finally, a hardware prototype is built using a TMS320C6711- based controller. Experimental results verify the functionality of the DSTATCOM.

Go to article

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