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Journal of Marine Science and Technology–Taiwan

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Articles 1021 - 1050 of 1299

Full-Text Articles in Engineering

Computer Assisted Proof Of Spurious Eigensolution For Annular And Eccentric Membranes, I-Lin Chen, Jeng-Tzong Chen, Wei-Ming Lee, Shang-Kai Kao Sep 2009

Computer Assisted Proof Of Spurious Eigensolution For Annular And Eccentric Membranes, I-Lin Chen, Jeng-Tzong Chen, Wei-Ming Lee, Shang-Kai Kao

Journal of Marine Science and Technology–Taiwan

Spurious eigensolutions in the boundary integral equation (BIE) or boundary element method (BEM) for doublyconnected domain problems, the eccentric and annular membranes, are studied analytically and numerically in this paper. For the mathematical analysis, we employ the null-field integral equation, the degenerate kernels and the Fourier series to prove the existence of spurious eigensolutions in the continuous system. Examples of eccentric case, annular membrane and general shape are solved by using the null-field equation approach and BEM, respectively. Based on the numerical experiment, computer-assisted proof for the existence of spurious eigenvalues in companion with the trivial outer boundary data is …

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A Mathematical Revision Of The Landau-Lifshitz Equation, Chein-Shan Liu, Kuo-Ching Chen, Chau-Shioung Yeh Sep 2009

A Mathematical Revision Of The Landau-Lifshitz Equation, Chein-Shan Liu, Kuo-Ching Chen, Chau-Shioung Yeh

Journal of Marine Science and Technology–Taiwan

For the Landau-Lifshitz equation a Lie type linear system representation in the Minkowski space M3 1+ has been derived previously [25]. The internal symmetry group is a proper orthochronous Lorentz group SOo(3, 1), and the numerical method based on the internal symmetry was developed in [29]. This paper derives another four new representations of the Landau-Lifshitz equation. We prove that this equation admits two generators: one conservative and one dissipative, as well as two brackets: Poisson bracket and dissipative bracket. Upon embedding the Landau-Lifshitz equation into a skew-symmetric matrix space, we can develop a double-bracket flow representation. The conserved magnetization …

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Method Of Fundamental Solutions With External Source For The Eigenfrequencies Of Waveguides, Chia-Ming Fan, Der-Liang Young, Chia-Lin Chiu Sep 2009

Method Of Fundamental Solutions With External Source For The Eigenfrequencies Of Waveguides, Chia-Ming Fan, Der-Liang Young, Chia-Lin Chiu

Journal of Marine Science and Technology–Taiwan

This study adopts a meshless numerical method, the combination of the method of fundamental solutions (MFS) and method of particular solutions (MPS) following the lead of Reutskiy, to determine the eigenfrequencies of four different waveguides, based on the principle of physical response of a system exposed to external source. The response amplitudes to determine the resonant frequencies for the eigenproblems are used. We use the MFS with external source (MFS-ES) and MPS to solve a sequence of inhomogeneous problems for the determination of the eigenfrequencies. This is an alternative to the typical methods of directly solving the homogeneous matrix system …

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Boundary Particle Method For Inverse Cauchy Problems Of Inhomogeneous Helmholtz Equations, Wen Chen, Zhuojia Fu Sep 2009

Boundary Particle Method For Inverse Cauchy Problems Of Inhomogeneous Helmholtz Equations, Wen Chen, Zhuojia Fu

Journal of Marine Science and Technology–Taiwan

This paper investigates the boundary particle method (BPM) coupled with truncated singular value decomposition (TSVD) regularization technique on the solution of inverse Cauchy problems of inhomogeneous Helmholtz equations. Unlike the other boundary discretization methods, the BPM does not require any inner nodes to evaluate the particular solution, since the method uses the recursive composite multiple reciprocity technique to reduce an inhomogeneous problem to a series of higher-order homogeneous problems. The BPM is particular attractive to solve inverse problems thanks to its truly boundary-only meshless merit. In this study, numerical experiments demonstrate that the BPM in conjunction with the TSVD is …

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Antifouling Properties Of Conductive Rubber Coatings Used For Fishing Nets, Jer-Ruey Huang, Wei-Ting Lin, Ran Huang, Jiann-Kuo Wu Sep 2009

Antifouling Properties Of Conductive Rubber Coatings Used For Fishing Nets, Jer-Ruey Huang, Wei-Ting Lin, Ran Huang, Jiann-Kuo Wu

Journal of Marine Science and Technology–Taiwan

The purpose of the present study is to develop a new conductive coating for application on fishing nets that can be used as an anode, while submersed in the sea, to generate free chlorine which will in turn inhibit marine biofouling. To confirm the durability and viability of this coating, long-term field tests were carried out in the Nanao harbor in Taiwan. Electrical resistivity tests showed that conductive rubber with a polyaniline coating demonstrates the lowest resistivity: 0.11 Ωm. This sample also generated optimal quantities of free chlorine, which demonstrates antifouling properties. The use of carbon black in conjunction with …

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Studies Of Tumbling Motion Generated During Intake In A Bowl-In-Piston Engine, Wen-Cheng Huang Jun 2009

Studies Of Tumbling Motion Generated During Intake In A Bowl-In-Piston Engine, Wen-Cheng Huang

Journal of Marine Science and Technology–Taiwan

Approaching flood can be likened to a oncoming missile, and flood routing is viewed as to build an anti-missile system. The applications of the Kalman filter to hydrologic models are not suitable. The Kalman filter fails to yield totally effective predictions in the hydrologic routing by the fact that any specific objective (peakflow) cannot be designated in advance. Without predetermined objectives, the predicted flows cannot catch the real values but follow the traces of the real hydrograph.

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Analysis Of Maximum Wind Force For Offshore Structure Design, Jing-Jong Jang, Guo Jyh-Shinn Jun 2009

Analysis Of Maximum Wind Force For Offshore Structure Design, Jing-Jong Jang, Guo Jyh-Shinn

Journal of Marine Science and Technology–Taiwan

This paper presents the results of a study in which a method is developed for estimating maximum turbulent wind drag force acting on a floating offshore structure with low natural frequency. In evaluating the drag force, forces associated with turbulent wind speeds are considered using both the linear and nonlinear reliability analysis approaches. A mathematical wind spectral density formulation is employed. The probability density function applied for the maximum turbulent wind-induced drag force analysis is considered as a random process. The maximum wind force is analytically developed by using an approximate single term expression for the functional relationship between the …

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H∞Norm And Variance Constrained Controller Design For Perturbed Stochastic System Via Variable Structure Control, Wen-Jer Chang, Koan-Yuh Chang Jun 2009

H∞Norm And Variance Constrained Controller Design For Perturbed Stochastic System Via Variable Structure Control, Wen-Jer Chang, Koan-Yuh Chang

Journal of Marine Science and Technology–Taiwan

Based on the concept of variable structure control, this paper investigates the upper bound covariance assignment with H∞ norm and variance constrained problem for perturbed stochastic systems. Because of the invariance property of variable structure systems, the matched perturbation of the system disappears on the sliding mode. With the aid of Ito-formula, the controller u(t) is proposed. Combining the sliding phase and hitting phase of the system design, the control feedback gain matrix G is derived to achieve upper bound covariance assignment with H∞ norm and variance constraints.

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Vibration Analysis Of Pre-Twisted Beams Using The Spline Collocation Method, Ming-Hung Hsu Jun 2009

Vibration Analysis Of Pre-Twisted Beams Using The Spline Collocation Method, Ming-Hung Hsu

Journal of Marine Science and Technology–Taiwan

The variation in the accuracy of the calculated natural frequencies of pre-twisted beams solved with spline collocation method is investigated in this study. The spline collocation method is used to formulate the eigenvalue problems of pre-twisted beams. Three types of boundary conditions are considered. Numerical results indicate that the accuracy of the calculated natural frequencies is significantly dependent upon the pre-twisted angle of the non-uniform beam. Results that show that spline collocation method is very competitive for the vibration analysis of pre-twisted beams are presented.

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Labview-Based Fuzzy Controller Design Of A Lighting Control System, Mou-Lin Jin, Ming-Chun Ho Jun 2009

Labview-Based Fuzzy Controller Design Of A Lighting Control System, Mou-Lin Jin, Ming-Chun Ho

Journal of Marine Science and Technology–Taiwan

This paper describes how we design a lighting control system including hardware and software. Hardware includes light sensing circuit, control circuit, and 8255 expanding I/O circuit, PC, and bulb. Sensing circuit uses photo-resistance component to sense the environmental light and then transmit the signal of the lightness to the computer through an 8-bit A/D converter 0804. The control circuit applies reed relay in digital control way to adjust the variable resistor value of the traditional dimmer. Software incorporates LABVIEW graphical programming language and MATLAB Fuzzy Logic Toolbox to design the light fuzzy controller. The rule-base of the fuzzy logic controller …

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Catamaran Motion Simulation Based On Moving Grid Technique, Ebrahim Jahanbakhsh, Roozbeh Panahi, Mohammad Saeed Seif Jun 2009

Catamaran Motion Simulation Based On Moving Grid Technique, Ebrahim Jahanbakhsh, Roozbeh Panahi, Mohammad Saeed Seif

Journal of Marine Science and Technology–Taiwan

General purpose software is developed to simulate 6-DoF fluid-structure interaction in two-phase viscous flow. It is a VoF-fractional step solver based on the finite-volume discretization which uses a boundary-fitted body-attached hexahedral grid as the motion simulation strategy. As an application, a high-speed planing catamaran is simulated in steady forward motion as well as in turning maneuver. Results are compared with the available data and good qualitative and quantitative agreements are achieved. Numerical schemes and the solution algorithm of the software are consistent and show a good capability to model highly nonlinear ship motions. It can be further developed to represent …

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Evaluation Of Highway Maintenance Performance Using Data Envelopment Analysis (Dea) In Taiwan, Lung-Chuang Wang, Hsiu-Yu Tsai Jun 2009

Evaluation Of Highway Maintenance Performance Using Data Envelopment Analysis (Dea) In Taiwan, Lung-Chuang Wang, Hsiu-Yu Tsai

Journal of Marine Science and Technology–Taiwan

Data Envelopment Analysis (DEA) is utilized in this study to evaluate the performance of 31 highway maintenance sections belonging to the Directorate General of Highways (DGH). The input data are total amount of budget, manpower, and machines, and the output data are length of highway, routine expenditure on maintenance, budget for salvage, and the revenue from helping digging and mending roads. In order to make the analysis fit to the goals of highway maintenance sections, the weights of some inputs and outputs are restricted. The analytical models of CCR and BCC are used to estimate productive efficiency, technical efficiency, and …

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Investigation Of Longitudinal Elastic Wave Propagation Through Intersecting Welded Bars, Ming-Te Liang, Chiou-Jenn Chen Jun 2009

Investigation Of Longitudinal Elastic Wave Propagation Through Intersecting Welded Bars, Ming-Te Liang, Chiou-Jenn Chen

Journal of Marine Science and Technology–Taiwan

The main purpose of this paper is to express a general formulation for the theoretical analysis of longitudinal elastic wave propagation through a general and in particular the T and ┼ junctions. The bar joint is modeled as a rigid block. The bars are assumed to be all of the same thickness but may differ in width and may be of different materials. Elementary theory is applied to investigate the propagation of longitudinal wave. The present study indicates that for a T junction there would be no transmission of the longitudinal elastic wave. For a ┼ junction there would be …

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Behavior Of Chemically Dispersed Oil In Marine Sediment, Jian Hua Jun 2009

Behavior Of Chemically Dispersed Oil In Marine Sediment, Jian Hua

Journal of Marine Science and Technology–Taiwan

This laboratory study was to describe properties of four chemically dispersed oils within natural beach sands. The influence of temperature on the adsorption characteristics of dispersed oil to marine sediment was almost negligible, within 10 to 30°C. With certain amount of oil and varied dispersant/oil ratio, oil in top sediments following flushing was not affected by the increase in dispersant application. The application dosage of dispersant had no more influence on releasing oil to deeper sediment or water than the amount of oil applied. When the outflow rate of flushing water doubled, the amounts of oil retained in surface sediment …

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Kalman Filter Effective To Hydrologic Routing?, Yang-Liang Jeng, Rong-Che Chen, Chao-He Chang Jun 2009

Kalman Filter Effective To Hydrologic Routing?, Yang-Liang Jeng, Rong-Che Chen, Chao-He Chang

Journal of Marine Science and Technology–Taiwan

Intake-generated tumbling motion has been recently proposed to enhance the turbulence level during compression stroke to promote the combustion rate and reduce operation variations. This study is to investigate the quality of the tumbling motion, especially for the engine with a bowl-in-piston. To overcome the difficulties on the flow visualization caused by the high-speed motion of a real engine, a transparent water-analogy-simulation system is designed based on similarity analysis and fabricated to model the operation of an actual engine. Benchmark tests including the qualitative flow visualization and quantitative full-field measurements using a high-speed PIA system have been conducted to study …

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Wave Forces On A Large Structure In The Presence Of A Current, Sung-Shan Hsiao, Ming-Chung Lin Jun 2009

Wave Forces On A Large Structure In The Presence Of A Current, Sung-Shan Hsiao, Ming-Chung Lin

Journal of Marine Science and Technology–Taiwan

The wave forces acting on a large structure in the presence of a current have been investigated numerically. It is noted that the velocity potential in a wave-current coexisting field can be separated into an unsteady wave potential and a steady current potential. The unsteady wave potential with effects of both a uniform current and a large structure was calculated by using boundary element method. The steady current potential can be expressed as the sum of a uniform current and a steady disturbance due to the existence of the structure. This means that current velocity will be changed in the …

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Real Time Implementation Of Frost Beamformer For Underwater Communications, Hsien-Sen Hung, Shun-Hsyung Chang, Suan-Lin Chen, Chi-Wen Chang Jun 2009

Real Time Implementation Of Frost Beamformer For Underwater Communications, Hsien-Sen Hung, Shun-Hsyung Chang, Suan-Lin Chen, Chi-Wen Chang

Journal of Marine Science and Technology–Taiwan

In this paper, we investigate the performance of Frost’s linearly constrained minimum variance (LCMV) adaptive beamformer via computer simulations for QPSK signals transmitted over Rayleigh and Rician fading channels. Simulation results show that the Frost beamformer can still improve the signal-to-interference-plus-noise ratio, even over fading channels. For real-time underwater communications, a prototype system is implemented, which uses TMS320C40 digital signal processor chip for realization of the Frost beamformer. Through experiments in an acoustic trough the validity of the real-time Frost beamformer prototype system is verified, and the feasibility of its use in underwater communications is assessed.

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Decision Analysis For Construction Contract Risk-Sharing, Teh-Chang Lee, Ta-Hsing Lee, Ching-Hwang Wang Jun 2009

Decision Analysis For Construction Contract Risk-Sharing, Teh-Chang Lee, Ta-Hsing Lee, Ching-Hwang Wang

Journal of Marine Science and Technology–Taiwan

As the risk-sharing provisions in domestic public construction contracts are not completely fair and reasonable, contract disputes often arise as a result which in turn cause delays, quality impacts, and other problems that urgently need improvement. Introduced in this article is the development of a decision system for risk-sharing in public construction contracts. Said system was developed through literature review, questionnaire and interviews of experts, fuzzy synthetic evaluation in conjunction of analytic hierarchy process, definition of risks in public construction contracts, and establishment of decision models for risk-sharing. Subsequently, the “escalation” risk was employed as an example to select suitable …

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Residual Vibrations Of Electrostatic Micro-Actuators With Novel Shaped Cantilevers, Ming-Hung Hsu Jun 2009

Residual Vibrations Of Electrostatic Micro-Actuators With Novel Shaped Cantilevers, Ming-Hung Hsu

Journal of Marine Science and Technology–Taiwan

This paper subjects electrostatic curved electrode actuators with novel shaped cantilevers to nonlinear dynamic analysis using the differential quadrature method. Numerical results are compared with experimental results to assess the efficiency and systematic procedure of this novel approach for nonlinear differential equations. The pull-in voltages computed for different structures correlate well with published data. Several characteristics of different combinations of shaped cantilevers and curved electrodes are also examined in this paper. Dynamic responses of actuators with novel shapes with several pull-in voltages are determined. The transitional responses for the derived systems are calculated using the Wilson-θ method.

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Evaporation Effect In Nonlinear Penetration Of High Energy Beam Drilling, Je-Ee Ho, Chen-Lung Yen Jun 2009

Evaporation Effect In Nonlinear Penetration Of High Energy Beam Drilling, Je-Ee Ho, Chen-Lung Yen

Journal of Marine Science and Technology–Taiwan

Due to the inappropriate assumption with the neglect of evaporation effect in previous research, a linear penetration behavior with a significant deviation from the experimental result was usually proposed in the lower energy density region. To remedy the defect, the evaporation mass determined from the difference between the melting rate and flow expulsion by pressure difference is reconsider in this study. With a 2-D quasic-steady model based on the enthalpy theory, the uniform penetration velocity estimated from the Stefan boundary condition provides a special advantage in calculating efficiency. Meantime, the divergent iteration has been effectively avoided by setting up a …

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Inductively/Capacitively Coupled Conductor-Backed Coplanar Waveguide Bandpass Filters Using Slow-Wave Stepped-Impedance Resonators, Jiunn-Jye Chang, Chih-Hong Sie Jun 2009

Inductively/Capacitively Coupled Conductor-Backed Coplanar Waveguide Bandpass Filters Using Slow-Wave Stepped-Impedance Resonators, Jiunn-Jye Chang, Chih-Hong Sie

Journal of Marine Science and Technology–Taiwan

In this paper, using the conductor-backed coplanar waveguides (CBCPWs) and the slow-wave stepped-impedance resonators, a second-order and a fourth-order inductively/capacitively coupled bandpass filters are designed, implemented, and measured. For second-order bandpass filter, two H-shaped defected ground structure (DGS) patterns are etched on the backside metallic ground planes of the input and output feedlines, it is found that two attenuation poles exist on both sides of the passband. When compared to the fourth-order bandpass filter without H-shaped DGS, the second-order bandpass filter with H-shaped DGS has compact size and comparable rolloff at the edges of the passband. In addition, the measured …

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Frsmc Design For The Steering Control And Diving Control Of Underwater Vehicles, Tzu-Chun Kuo, Ying-Jeh Huang, Hung-Hsiu Yu Mar 2009

Frsmc Design For The Steering Control And Diving Control Of Underwater Vehicles, Tzu-Chun Kuo, Ying-Jeh Huang, Hung-Hsiu Yu

Journal of Marine Science and Technology–Taiwan

A robust control method is proposed for the steering and diving control systems of autonomous underwater vehicles. Heading angle and heave position tracking are achieved. All the closed-loop poles in the sliding mode can be placed by using the sliding mode and root locus techniques. Fuzzy logic technique is further employed to effectively tune the control law. Parameter variation and external disturbance such as various vehicle speeds and the ocean current effect are overcome.

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Lateral Buckling Analysis Of Angled Frames With Thin-Walled I-Beams, Jong-Dar Yau Mar 2009

Lateral Buckling Analysis Of Angled Frames With Thin-Walled I-Beams, Jong-Dar Yau

Journal of Marine Science and Technology–Taiwan

With the inclusion of warping deformations, lateral buckling behavior for angled frames with I-beams under the action of in-plan bending moments will be conducted in this paper. By adopting the joint equilibrium for the angled frame and the force-displacement relations for the members defined at the buckled position (rather than the initial position), the analytical solutions for buckling moments of an angled frame with simply supported ends are presented in closed form. The computed results indicate that for symmetric buckling, the buckling resistance to resist positive moments can be strengthened along with the increase of inclined angle of the member …

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Lmi Robustly Decentralized H Output Feedback Controller Design For Stochastic Large-Scale Uncertain Systems With Time-Delays, Wen-Ben Wu, Pang-Chia Chen, Min-Hsiung Hung, Koan-Yuh Chang, Wen-Jer Chang Mar 2009

Lmi Robustly Decentralized H Output Feedback Controller Design For Stochastic Large-Scale Uncertain Systems With Time-Delays, Wen-Ben Wu, Pang-Chia Chen, Min-Hsiung Hung, Koan-Yuh Chang, Wen-Jer Chang

Journal of Marine Science and Technology–Taiwan

The present paper investigates the problem of robustly decentralized H∞ output feedback controller design for a class of stochastic large-scale uncertain systems with time-delays. The considered time-delay parameters appear in the interconnections between individual subsystems and uncertainties are allowed to be unstructured but time-varying and norm-bounded. The sufficient conditions of the desired output feedback controller are based on the Lyapunov-Krasovskii stability theory and utilizing the decentralized scheme to be derived in terms of linear matrix inequalities (LMIs). The effectiveness of the proposed approach is illustrated by a numerical example.

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Vibroacoustic Attenuation Effect Of Sandwich Damping Material On Pipe Flow Noise, Wei-Yu Lu, Wei-Hui Wang Mar 2009

Vibroacoustic Attenuation Effect Of Sandwich Damping Material On Pipe Flow Noise, Wei-Yu Lu, Wei-Hui Wang

Journal of Marine Science and Technology–Taiwan

The attenuation effects of a number of sheathing materials on pipe flow noise are assessed by numerical simulations of the sound pressure field around pipe wall and the transfer mobility function of pipe wall vibration. The simulation model is established by using the finite element method (FEM) and the boundary element method (BEM), in which solid elements are used for the pipe wall and the sheathing material. Between pipe wall and sheathing material , contact elements are adopted. The frequency dependent loss factors of the sheathing material are determined by the experimental modal analysis (EMA) based on the half power …

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Study On Mechanical Properties Of A356 Alloys Enhanced With Preformed Thixotropic Structure, Shueiwan H. Juang, Shyh-Ming Wu Dec 2008

Study On Mechanical Properties Of A356 Alloys Enhanced With Preformed Thixotropic Structure, Shueiwan H. Juang, Shyh-Ming Wu

Journal of Marine Science and Technology–Taiwan

A preformed A356 alloys with thixotropic structure (designated SSM-A356) was systematically studied on mechanical properties in order to establish the database for further investigations in forming and heat treatment. Because of the specific microstructure and characteristics, the heat treatment conditions of SSM-A356 were explored through the observations of microstructure and the measurement of micro-hardness. In the investigation of heat treatment, it was observed that the eutectic silicon was refined and spheroidized which is unlikely for conventional processing. The mechanical testing results showed that the yield and ultimate tensile strength of SSM-A356 were respectively around 115% and 34% greater than those …

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Assessment Of Ground Shaking In Ilan County, Taiwan, Hui-Mi Hsu, Sao-Jeng Chao, Howard Hwang Dec 2008

Assessment Of Ground Shaking In Ilan County, Taiwan, Hui-Mi Hsu, Sao-Jeng Chao, Howard Hwang

Journal of Marine Science and Technology–Taiwan

This paper presents an estimation of ground shaking intensity in the Ilan area caused by two scenario earthquakes. On the basis of seismic activity in the study area, the seismic zones, including Okinawa trough seismic zone section A and Suao-Hualien offshore seismic zone are established. The earthquakes occurring in these two zones are considered as the scenario earthquakes. The hundreds of boring logs are also collected and classified into three site classes as specified in the Taiwan Seismic Building Code. The intensity of ground shaking in the Ilan area caused by a scenario earthquake is then estimated by using an …

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Impact Of Fire-Through And Misfire In Rectifier Valves On A Turbine Generator Neighboring To A Hvdc Inverter Station, Ming-Te Liang Dec 2008

Impact Of Fire-Through And Misfire In Rectifier Valves On A Turbine Generator Neighboring To A Hvdc Inverter Station, Ming-Te Liang

Journal of Marine Science and Technology–Taiwan

The major purpose of this paper is the theoretical elucidation of the corrosion tube growth mechanism of mild steel occurred from the effect of pH value and oxygen corrosion at elevated pressure provided by Riggs et al. [6]. Based on the Nernst-Planck equation, continuity principle, Green's theorem, Stokes's theorem and the equation of Newton's second law of motion, the mechanism of corrosion tube development can be explained theoretically. The Bernoulli sum is contant at any cross-section of tubular corrosion product. The implication of the present results are theoretically enhanced the formation of corrosion tube mechanism.

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The Study Of Price Accept Threshold For The ??Lue Highway??Tour Of The North-East Region In Taiwan, Hung-Yen Chou, Jin-Long Lu, Chiang Fu Dec 2008

The Study Of Price Accept Threshold For The ??Lue Highway??Tour Of The North-East Region In Taiwan, Hung-Yen Chou, Jin-Long Lu, Chiang Fu

Journal of Marine Science and Technology–Taiwan

The “Blue Highway” in the NE region of Taiwan includes the tour itineraries of Keelung-Suao, Suao-Hualien and Keelung-Hualien, each with its individual oceanic scenic features and its potential corresponding onshore scenic spots. This study explores the relationship between the “Blue Highway” tour portfolios and price attributes to collect the preference recognition of the public concerning the NE region “Blue Highway” tour itineraries and prices with the stated preference method. The utility function of the discrete choice model assumes the impact effect among attributes to be in a linear relationship plus percentages. The price threshold model improves the assumption of this …

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Theoretical Elucidation On The Corrosion Tube Growth Mechanism Of Mild Steel In The Effect Of Ph On Oxygen Corrosion At Elevated Pressures, Ming-Te Liang Dec 2008

Theoretical Elucidation On The Corrosion Tube Growth Mechanism Of Mild Steel In The Effect Of Ph On Oxygen Corrosion At Elevated Pressures, Ming-Te Liang

Journal of Marine Science and Technology–Taiwan

The major purpose of this paper is the theoretical elucidation of the corrosion tube growth mechanism of mild steel occurred from the effect of pH value and oxygen corrosion at elevated pressure provided by Riggs et al. [6]. Based on the Nernst-Planck equation, continuity principle, Green's theorem, Stokes's theorem and the equation of Newton's second law of motion, the mechanism of corrosion tube development can be explained theoretically. The Bernoulli sum is contant at any cross-section of tubular corrosion product. The implication of the present results are theoretically enhanced the formation of corrosion tube mechanism.

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