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Journal of Marine Science and Technology–Taiwan

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Articles 901 - 930 of 1299

Full-Text Articles in Engineering

Hydrogen Absorption/Desorption In A Metal Hydride Reactor Accounting For Varied Effective Thermal Conductivity, Chih-Yuan Wang, Hwa-Chong Tien, San-Der Chyou, Nang-Nong Huang, Shing-Hoa Wang Apr 2011

Hydrogen Absorption/Desorption In A Metal Hydride Reactor Accounting For Varied Effective Thermal Conductivity, Chih-Yuan Wang, Hwa-Chong Tien, San-Der Chyou, Nang-Nong Huang, Shing-Hoa Wang

Journal of Marine Science and Technology–Taiwan

This paper investigates the effect of varied effective thermal conductivity on the hydrogen absorption/desorption in a metal hydride (MH) reactor. The effective thermal conductivity of a metal hydride bed was measured by performing steady-state experiment and then compared with the results obtained by employing an existing model. Good agreement was found. Next, numerical simulation on the performance of hydrogen absorption/desorption of the MH reactor was conducted by assuming either varied or constant effective thermal conductivity. Corresponding hydrogen absorption/desorption experiment was performed for comparison. It was found that numerical simulation accounting for varied effective thermal conductivity agrees with the experimental data …

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Dislocation Substructures Of Interstitial-Free Steel Subjected To Low Cycle Fatigue At Various Strain Amplitude, Shih-Wei Mao, Wen-Chun Lo, Hsing-Lu Huang, New-Jin Ho Apr 2011

Dislocation Substructures Of Interstitial-Free Steel Subjected To Low Cycle Fatigue At Various Strain Amplitude, Shih-Wei Mao, Wen-Chun Lo, Hsing-Lu Huang, New-Jin Ho

Journal of Marine Science and Technology–Taiwan

The aim of this wok is to study the fatigue properties in relation to the microstructures of interstitial-free (IF) steel, a representative of body center cubic (BCC) materials, subjected to low cycle periodic stress. In order to compare the grain size effect on dislocation development, we used samples of two distinctive grain sizes, 70 µm and 210 µm, prepared by different thermo-mechanical processes. We found (1) there was an initial softening when the stain amplitude was lower than 1.6% and the microstructure of the fatigued samples are cellular independent of the grain sizes and the amplitude of strain. (2) A …

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Zener-Stroh Crack Problem In A Finite Plate, Yizhou Chen Apr 2011

Zener-Stroh Crack Problem In A Finite Plate, Yizhou Chen

Journal of Marine Science and Technology–Taiwan

In this paper, a Zener-Stroh crack problem in a finite plate is studied. By using the principle of superposition, the original problem is converted into a Zener-Stroh crack problem in an infinite plate and a usual Griffith crack problem in a finite plate. The former problem has a solution in a closed form. The latter problem can be solved by using EEVM (eigenfunction expansion variational method). Finally, numerical examples for evaluating the stress intensity factors at crack tips are presented.

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Flexural Behavior And Size Effect Of Full Scale Reinforced Lightweight Concrete Beam, Chung-Hao Wu, Yu-Cheng Kan, Chung-Ho Huang, Tsong Yen, Li-Huai Chen Apr 2011

Flexural Behavior And Size Effect Of Full Scale Reinforced Lightweight Concrete Beam, Chung-Hao Wu, Yu-Cheng Kan, Chung-Ho Huang, Tsong Yen, Li-Huai Chen

Journal of Marine Science and Technology–Taiwan

This article presents the results of experimental investigations on the size effect and the flexural behavior of full size reinforced concrete beams with lightweight aggregate and normal aggregate. The lightweight aggregate (LWA) was manufactured with fine sediments collected from the Shih-Men Reservoir in Taiwan. A total of 6 flexure beams with various reinforcement ratios (from 0.33% to 1.3%) and 6 size-effect beams with various dimensions were fabricated and tested. The designed compressive strength of concrete was 34 MPa. Test results indicated that the reinforced lightweight aggregate concrete (LWAC) beams had a similar load capacity and failure mode as those of …

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Penetration Lag Of Chloride Diffusion Through Concrete Plate Based On Advancing Model, Chih-Hsing Wang, Cho-Liang Tsai, Ching-Chang Lin Apr 2011

Penetration Lag Of Chloride Diffusion Through Concrete Plate Based On Advancing Model, Chih-Hsing Wang, Cho-Liang Tsai, Ching-Chang Lin

Journal of Marine Science and Technology–Taiwan

The solution, based on Neumann's theory, for the content distribution of a diffusion material in a semi-infinite medium is applicable for the case in which a diffusion material diffuses from one side of a plate medium to the other side. After the diffusion material reaches the other side, the penetration rate of the diffusion material is solved using Fick's diffusion law. In this study, concrete plates are manufactured and submerged individually in special containers with saltwater on one side and freshwater on the other side, and no electric charge is applied. The amount of chloride penetrating the plate is monitored. …

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Deformation Of Rolling Shutters Under Uniform Wind Pressure, Nan-Nong Huang, San-Ming Chang Apr 2011

Deformation Of Rolling Shutters Under Uniform Wind Pressure, Nan-Nong Huang, San-Ming Chang

Journal of Marine Science and Technology–Taiwan

In this study, a model is developed to analyze the structural behaviors of rolling shutters subjected to wind pressure. In the current shutter theory, the elastic properties of shutters are characterized by two bending rigidities, which can be determined from the flexural tests of slats and shutters. Close form solutions can be obtained for the deflection of shutters with two opposite simply supported edges. To assess the validity of the present theory, rolling shutters with various sizes and supporting conditions under various magnitudes of loadings are tested. It is noted that the deflections and axial displacements based on the current …

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Biodeterioration Of Coastal Concrete Structures By Macro Algae - Ulva Fasciata, Stri Hari Babu Jayakumar, Rama Saravanane, Thirumalai Sundararajan Apr 2011

Biodeterioration Of Coastal Concrete Structures By Macro Algae - Ulva Fasciata, Stri Hari Babu Jayakumar, Rama Saravanane, Thirumalai Sundararajan

Journal of Marine Science and Technology–Taiwan

Puducherry is a coastal region in India where the growth of Ulva fasciata (Delile) is very abundant on all marine structures. Though the detrimental effect of this macro algae U. fasciata is a secondary one, its effect has to be investigated. To know its effect, the basic mechanism by which U. fasciata deteriorates concrete structures has been highlighted. To ascertain its detrimental effect on coastal concrete structures, M20 grade concrete cubes were casted and immersed in the coastal area where there is abundant growth of U. fasciata. In addition laboratory simulation has been carried out. Concrete samples collected from the …

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Numerical Assessment Of Two-Chamber Mufflers With Perforated Plug/Non-Plug Tubes Under Space And Back Pressure Constraints Using Simulated Annealing, Min-Chie Chiu, Ying-Chun Chang Apr 2011

Numerical Assessment Of Two-Chamber Mufflers With Perforated Plug/Non-Plug Tubes Under Space And Back Pressure Constraints Using Simulated Annealing, Min-Chie Chiu, Ying-Chun Chang

Journal of Marine Science and Technology–Taiwan

Recently, research on new techniques of single-chamber mufflers equipped with perforated tubes has been addressed. However, research work on shape optimization of multichamber silencers hybridized with perforated plug/non-plug tubes along with work on the maximal allowable back pressure of mufflers has been neglected. Therefore, we will not only analyze the sound transmission loss (STL) of a spaceconstrained two-chamber muffler hybridized with perforated plug/non-plug tubes but also optimize the best design shape under a specified pressure drop. In this paper, both the numerical decoupling technique and simulated annealing (SA) for solving the coupled acoustical problem of perforated plug/ non-plug tubes are …

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Quantitative And Visualized Interpretation Of Public Works Civil Litigation Scenario Of First Instance Review In Taiwan, Hsien-Sang Wu, John Chien-Chung Li, Jeng-Rong Lee, Wen-Yen Wu Apr 2011

Quantitative And Visualized Interpretation Of Public Works Civil Litigation Scenario Of First Instance Review In Taiwan, Hsien-Sang Wu, John Chien-Chung Li, Jeng-Rong Lee, Wen-Yen Wu

Journal of Marine Science and Technology–Taiwan

Existing studies regarding public works disputes and claims have drawn on small-scale cases to the exclusion of other cases and few have met the requirements of statistical tests. This paper performs an investigation of a total of 400 cases of civil litigation in which owners lost their disputes in Taiwan High Courts and branches between 1999 and 2008. Category analysis coding is used to construct a Log-linear model for judgment decisions; this model is augmented by Multiple Correspondence Analysis to reduce judicial opinions of over 4 million words to a two-dimensional figure, allowing for visual interpretation and identifying specific cases …

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Comparison Between Characteristics Of Geomorphoclimatic Instantaneous Unit Hydrograph Be Produced By Gciuh Based Clark Model And Clark Iuh Model, Arash Adib, Meysam Salarijazi, Mohammad Mahmoodian Shooshtari, Ali Mohammad Akhondali Apr 2011

Comparison Between Characteristics Of Geomorphoclimatic Instantaneous Unit Hydrograph Be Produced By Gciuh Based Clark Model And Clark Iuh Model, Arash Adib, Meysam Salarijazi, Mohammad Mahmoodian Shooshtari, Ali Mohammad Akhondali

Journal of Marine Science and Technology–Taiwan

A great number of developing countries do not have sufficient rainfall-rainoff data of watersheds. For designing a hydraullic structure, considering the basic characteristics of synthetic unit hydrograph is quite indispensable. The geomorphoclimatic approach considers the rainfall and the properties of the watershed. This method can provide a better representation of the runoff estimation. In this study, a geomorphoclimatic instantaneous unit hydrograph (GcIUH) model has been developed. It’s derived from the parameters of the CLARK instantaneous unit hydrograph(IUH) which completes its shape. GcIUH based Clark model was applied from the Kasilian watershed in northern part of Iran. The Direct Surface Run …

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Evaluation Of Side Resistance Capacity For Drilled Shafts, Yit-Jin Chen, Shiu-Shin Lin, Hsin-Wen Chang, Maria Cecilia Marcos Apr 2011

Evaluation Of Side Resistance Capacity For Drilled Shafts, Yit-Jin Chen, Shiu-Shin Lin, Hsin-Wen Chang, Maria Cecilia Marcos

Journal of Marine Science and Technology–Taiwan

This paper presents an extensive evaluation of axial side resistance of drilled shaft foundations. A wide variety of load test data are used and these data are divided into drained and undrained databases. Representative analytical models, including alpha (α), beta (β), and lambda (λ) methods, are examined in detail using both measured and predicted results to assess their relative merits for the drilled shaft design. Based on these analyses, the undrained shear strength (α-su) correlations have exhibited better statistics for undrained side resistance prediction, and the undrained strength ratio (α-USR) correlations can be adopted as an alternative analytical method, especially …

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Numerical Study On Random Waves And Wave-Induced Long-Shore Currents At Leadbetter Beach, Lei Cui, Jun Tang Apr 2011

Numerical Study On Random Waves And Wave-Induced Long-Shore Currents At Leadbetter Beach, Lei Cui, Jun Tang

Journal of Marine Science and Technology–Taiwan

Shallow coastal zone is extremely dynamic region, where the hydrodynamics are complicated as evident in the refraction, diffraction, shoaling and breaking of water waves, as well as the presence of wave-induced near-shore currents. In this paper, the distribution of waves and wave-induced long-shore currents formed by the breaking of obliquely incident random waves at Leadbetter Beach, Santa Barbara, USA are numerically studied. In the present numerical models, the random water waves are simulated based on the parabolic mild slope equation, and so the wave radiation stresses exerted on waveinduced currents are calculated based on variables in the parabolic mild slope …

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Numerical Investigation Of Damping Effects On Coupled Heave And Pitch Motion Of An Innovative Deep Draft Multi-Spar, Bin-Bin Li, Jin-Ping Ou, Bin Teng Apr 2011

Numerical Investigation Of Damping Effects On Coupled Heave And Pitch Motion Of An Innovative Deep Draft Multi-Spar, Bin-Bin Li, Jin-Ping Ou, Bin Teng

Journal of Marine Science and Technology–Taiwan

Deep draft multi-spar (DDMS), a novel deepwater platform, possesses the similar hydrodynamic and motion performances with the Spar platform. Therefore the DDMS may have instability of Mathieu’s type because the heave natural period is close to the half pitch natural period. The objective of this paper is to numerically study the damping effects on the Mathieu instability and the mechanism of this singular phenomena. In this simulation, the damping is determined through the free-decay tests based on a rigorous coupled hull and mooring model. The nonlinear motion equations of coupled heave and pitch considering the time-varying restoring forces are established …

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Trust Evaluation Model With Regard To The Role Of Engineer In Public Construction Projects In Taiwan, Wen-Lin Tzeng, John Chien-Chung Li Feb 2011

Trust Evaluation Model With Regard To The Role Of Engineer In Public Construction Projects In Taiwan, Wen-Lin Tzeng, John Chien-Chung Li

Journal of Marine Science and Technology–Taiwan

In view of the client distrust in engineer, in the current context in Taiwan, it is uncommon to employ private engineers for public construction projects. In this study, which analyzed data of the period between 2003 and 2006, a questionnaire was administered to collate the viewpoints of clients, contractors, and architects/engineers (A/Es) involved in public construction projects that employed engineer. The opinions of participants regarding trust factors that influenced client evaluations of engineer were analyzed. Twenty-six trust factors were analyzed via interviews and a literature review. These factors were grouped using the principal component method and the varimax rotation approach. …

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Due-Date Assignment And Optional Maintenance Activity Scheduling Problem With Linear Deterioreting Jobs, Chou-Jung Hsu, Suh-Jenq Yang, Dar-Li Yang Feb 2011

Due-Date Assignment And Optional Maintenance Activity Scheduling Problem With Linear Deterioreting Jobs, Chou-Jung Hsu, Suh-Jenq Yang, Dar-Li Yang

Journal of Marine Science and Technology–Taiwan

The focus of this work is to analyze linear deteriorating jobs in a single-machine scheduling problem with due-date assignment and maintenance activity. The linear deteriorating jobs means its processing time is an increasing function of their starting time. The objective is to minimize the total of earliness, tardiness and due-date cost. To solve the scheduling problem addressed in this work, we have to determine the job sequence, the common due-date, and the location of a maintenance activity. We show that the problem can be solved optimally in O(n2 log n) time.

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Selection Of The Width Of A Caisson, Chi Chao David Tung, Jaw Guei Lin Feb 2011

Selection Of The Width Of A Caisson, Chi Chao David Tung, Jaw Guei Lin

Journal of Marine Science and Technology–Taiwan

This study is concerned with the selection of the width of a caisson. At present, the width is determined based on the consideration that, struck by a prescribed design impulsive breaking wave force, a caisson must remain stable against sliding and rocking. In this study, the problem is formulated in a different way. The equations of equilibrium of a caisson, together with the criteria for the caisson to remain at rest, are used to derive expressions for the selection of the width. The criteria of a rest mode are presented graphically using the applied force as the abscissa and the …

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Behavior Of Cations In Mortar Under Accelerated Lithium Migration Technique Controlled By A Constant Voltage, Chih-Chien Liu, Wei-Chien Wang, Chau Lee Feb 2011

Behavior Of Cations In Mortar Under Accelerated Lithium Migration Technique Controlled By A Constant Voltage, Chih-Chien Liu, Wei-Chien Wang, Chau Lee

Journal of Marine Science and Technology–Taiwan

The Accelerated Lithium Migration Technique (ALMT) is an electrochemical method to remove Na+ and K+ from concrete, and simultaneously drive Li+ into concrete to inhibit alkali-silica reaction (ASR). This study investigates the relationship between the applied voltage and the migration behavior of cations related to ASR. The results show that after the completion of Na+ and K+ removal, migration of Li+ begins to enter a steady state. With the increase in applied voltage, the removal rate and removable amount of alkalis increases, the required time of alkalis removal and the time for Li+ to pass through the specimen decreases, and …

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A Novel Particle Swarm Optimization Algorithm Solution Of Economic Dispatch With Valve Point Loading, Chun-Lung Chen, Rong-Mow Jan, Tsung-Ying Lee, Cheng-Hsiung Chen Feb 2011

A Novel Particle Swarm Optimization Algorithm Solution Of Economic Dispatch With Valve Point Loading, Chun-Lung Chen, Rong-Mow Jan, Tsung-Ying Lee, Cheng-Hsiung Chen

Journal of Marine Science and Technology–Taiwan

It is widely recognized that a proper schedule of available generating units may save utilities millions of dollars per year in production costs. A novel particle swarm optimization (PSO) combined with the direct search method (DSM) is developed in this paper for the solution of economic dispatch (ED) problem with valve-point effect. A new inertia weight mechanism is incorporated into PSO to enhance its search capacity that leads to a higher probability of obtaining the global optimal solution. The main attractive feature of the proposed inertia weight mechanism is to monitor the weights of particles, which were linearly decreased in …

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Strategies In Using Numerical Wave Models In Ocean/Coastal Applications, Eugen Rusu Feb 2011

Strategies In Using Numerical Wave Models In Ocean/Coastal Applications, Eugen Rusu

Journal of Marine Science and Technology–Taiwan

The objective of the present work is to illustrate the performances of the numerical wave models in ocean and coastal environment. Third generation wave models are considered nowadays the most appropriate for such task. These are full spectral models based on the integration on the wave energy (or alternatively wave action) balance equation. In order to cover more aspects related with the modelling process hindcast, nowcast and forecast schemes are discussed and illustrated along six case studies. The major model used was SWAN (acronym for Simulating Waves Nearshore) which is a very flexible model that can be applied in a …

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Numerical Solutions Of Differential-Algebraic Equations And Its Applications In Solving Tppc Problems, He-Sheng Wang, Wei-Lun Jhu, Chee-Fai Yung, Ping-Feng Wang Feb 2011

Numerical Solutions Of Differential-Algebraic Equations And Its Applications In Solving Tppc Problems, He-Sheng Wang, Wei-Lun Jhu, Chee-Fai Yung, Ping-Feng Wang

Journal of Marine Science and Technology–Taiwan

In this paper, we present a numerical method for solving nonlinear differential algebraic equations (DAE’s) based on the backward differential formulas (BDF) and the Pade series. Usefulness of the method is then illustrated by a numerical example, which is concerned with the derivation of the optimal guidance law for spacecraft. This kind of problems is called trajectory-prescribed path control (TPPC) in the literature. We reformulate the problem as a Hamiltonian DAE system (usually with a higher index). After establishing the system of spacecraft dynamics, we can derive the optimal guidance law of the system by the proposed numerical method.

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An Experimental Study On Hydrodynamic Characteristics Of Gliding-Hydrofoil Craft, Shu Ling Chen, Song Lin Yang, Qingwei Ma Feb 2011

An Experimental Study On Hydrodynamic Characteristics Of Gliding-Hydrofoil Craft, Shu Ling Chen, Song Lin Yang, Qingwei Ma

Journal of Marine Science and Technology–Taiwan

The Gliding-Hydrofoil Craft (GHC) has been recently proposed by the authors from JUST, which is partially similar to a planing craft but has a hydrofoil installed in the front part of the ship. To study its hydrodynamic characteristics, model tests are carried out in a towing tank, and the total resistance, trim angle and wetted area of the craft in the cases with different Froude numbers are measured. This paper presents analysis on the experimental data and discusses the effects of the submerged depth and initial attack angle of the hydrofoil.

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Computing Multiscale Entropy With Orthogonal Range Search, Yu-Hsiang Pan, Wei-Yen Lin, Yung-Hung Wang, Kuo-Tien Lee Feb 2011

Computing Multiscale Entropy With Orthogonal Range Search, Yu-Hsiang Pan, Wei-Yen Lin, Yung-Hung Wang, Kuo-Tien Lee

Journal of Marine Science and Technology–Taiwan

Multi-scale entropy (MSE) is a measurement of a system's complexity. It has received a great deal of attention in recent years, and its effectiveness has been verified, and applied in a number of different fields. However, the algorithms proposed in past studies required O(N2 ), which represented a degree of execution time insufficient for on-line applications, or for applications with long-term correlations. In this study, we showed that the probability function in the entropy term could be transformed into an orthogonal range search in the field of computational geometry. We then developed an efficient new algorithm for computing multi-scale entropy. …

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A Time-Domain Analysis Of Wave Force On Small-Scale Cylinders Of Offshore Structures, Bao-Lei Geng, Bin Teng, De-Zhi Ning Dec 2010

A Time-Domain Analysis Of Wave Force On Small-Scale Cylinders Of Offshore Structures, Bao-Lei Geng, Bin Teng, De-Zhi Ning

Journal of Marine Science and Technology–Taiwan

To get the accurate wave loads on the small-scale cylinders on the platforms, not only the incident wave but also the diffraction and radiation wave should be considered. By taking the wave diffraction from a fixed large-scale cylinder as an example, wave loads on small-diameter cylinders in the diffraction wave field are calculated by Morison formula in this paper. A time-domain numerical model on wave diffraction from large-scale structures is developed with a higher-order boundary element method (HOBEM). Then the velocity and acceleration of any water particle in the fluid domain can be produced from the solved diffraction potential. Results …

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Improving The Emulsion Stability Of Sponge Cake By The Addition Of ?-Polyglutamic Acid, Yung-Shin Shyu, Wen-Chieh Sung Dec 2010

Improving The Emulsion Stability Of Sponge Cake By The Addition Of ?-Polyglutamic Acid, Yung-Shin Shyu, Wen-Chieh Sung

Journal of Marine Science and Technology–Taiwan

The batter properties of sponge cake with the addition of γ-polyglutamic acid (PGA) at different levels (0.05, 0.1, 0.5 gkg-1, w/w) was evaluated. The viscosity, emulsion stability and foam stability increased at the addition of 0.5 gkg-1 PGA level. PGA caused significant declines in the differential scanning calorimetry (DSC) enthalpy, onset and peak temperatures of ice-melting transition of sponge cake. Sponge cakes manufactured with 0.5 gkg-1 PGA addition were in general lighter on crumb color and white index than the control. Scanning electron microscopy showed that sponge cake with the addition of 0.1 and 0.5 gkg-1 PGA exhibited microstructures having …

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Sidescan Sonar Image Processing:Correcting Brightness Variation And Patching Gaps, Yet-Chung Chang, Shu-Kun Hsu, Ching-Hui Tsai Dec 2010

Sidescan Sonar Image Processing:Correcting Brightness Variation And Patching Gaps, Yet-Chung Chang, Shu-Kun Hsu, Ching-Hui Tsai

Journal of Marine Science and Technology–Taiwan

Sidescan sonar data are typically presented as gray level images. However, sidescan images often show striking variations in brightness. These variations, caused by the sonar beam pattern and the constantly changing attitude of the towfish, make the images difficult to read as pictures of the seabed. This reduces the utility of the images for marine geologists. In this paper, the effects of the sonar beam pattern across the swath are corrected using a normalization process based on the average signal intensity for each grazing angle. Noise along the track, which is generally caused by changes in the attitude of the …

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The Sensitivity Analysis Of A Mems Microphone With Different Membrane Diameters, Cheng-Ta Yang Dec 2010

The Sensitivity Analysis Of A Mems Microphone With Different Membrane Diameters, Cheng-Ta Yang

Journal of Marine Science and Technology–Taiwan

In MEMS capacitive microphone design, it is very critical to get highest yielding rate and sensitivity as the two major factors dominate structure design of microphone. The centralpost MEMS microphone is introduced in this paper to differentiate from traditional fixed membrane boundary microphone since the construction is simple and only few masks are required in the process so that the yielding can be greatly enhanced. Thus, it is necessary to find the relationship between the sensitivity and dimension of the diameter of the membrane. The main research steps described in this paper include using CoventorWarer to develop one analysis model …

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The Application Of E-Technology For Marine Information Service, Lien-Kwei Chien, Tsung-Shen Feng, Chieh-Cheng Yen, Beng-Chun Lee, Heng-Wen Chang Dec 2010

The Application Of E-Technology For Marine Information Service, Lien-Kwei Chien, Tsung-Shen Feng, Chieh-Cheng Yen, Beng-Chun Lee, Heng-Wen Chang

Journal of Marine Science and Technology–Taiwan

The purpose of this study is to establish the multi-function querying system by applying e-technology in marine data. Subjects tendency technology is new concept in system designing process of this study which originate from simulation language that was replace the structural technology. We also investigate the statistical characteristics of ocean waves and surges over Taiwan waters by cluster and return period analysis. Marine drifter track analysis and search area determination system were also analysis and import to GIS querying system. In order to make the locations of the near shore ships and sailing data could be easily convey through wireless …

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Stability Assessment For The Undersea Gas Pipeline, Wen-Chien Tseng, Lien-Kwei Chien, Sheng-Tse Chuang, Pei-Chi Tsai, Ya-Ting Hsu, Ting-Ting Lu, Chu-Kuan Lin Dec 2010

Stability Assessment For The Undersea Gas Pipeline, Wen-Chien Tseng, Lien-Kwei Chien, Sheng-Tse Chuang, Pei-Chi Tsai, Ya-Ting Hsu, Ting-Ting Lu, Chu-Kuan Lin

Journal of Marine Science and Technology–Taiwan

In general, the activities of harbour district, coastal construction and re-transportation of tide and current are all possible to influence the stability of research area and sediment environment in nearshore area. It indicates that status of deposit property of seabed and variability of sediment environment are important factors to stability and safety for the path of undersea gas pipeline. An assessment procedure and approach for the prediction of the wave-induced and earthquake-induced liquefaction potential and erosion potential are proposed for marine engineering practice. The soil sample of this study is obtained from deposit zone of gas pipeline of seabed in …

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A New Calibration Method For Low Cost Mems Inertial Sensor Module, Sheng-Chih Shen, Chia-Jung Chen, Hsin-Jung Huang Dec 2010

A New Calibration Method For Low Cost Mems Inertial Sensor Module, Sheng-Chih Shen, Chia-Jung Chen, Hsin-Jung Huang

Journal of Marine Science and Technology–Taiwan

This paper presents a new calibration method to overcome the challenges of MEMS inertial sensors for underwater navigation. The MEMS inertial sensor module is composed of an accelerometer, a gyroscope and a circuit of signal process. For navigation estimation, it is easy to be influenced by errors which come from MEMS inertial sensors. In general, the sources of error can be categorized into two groups, deterministic type and stochastic type. The former primarily includes bias errors, misalignment and nonlinearity; the latter contains temperature effect and signal drifting. Subsequently, the linearity calibration is used to modify the deterministic error and the …

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The Performance Of Indium Tin Oxide Films Deposited On Plastic Substrate Applied For Solar-Cell Buoy, Chien-Kun Wang, Jyh-Jier Ho, Sung-Jen Nien, Yuang-Tung Cheng, William Lee, Chih-Chiang Lu, Bao-Shun Yau, Hsing-Wang Tsai, Chung-Cheng Chang Dec 2010

The Performance Of Indium Tin Oxide Films Deposited On Plastic Substrate Applied For Solar-Cell Buoy, Chien-Kun Wang, Jyh-Jier Ho, Sung-Jen Nien, Yuang-Tung Cheng, William Lee, Chih-Chiang Lu, Bao-Shun Yau, Hsing-Wang Tsai, Chung-Cheng Chang

Journal of Marine Science and Technology–Taiwan

In this paper, we report the indium tin oxide (ITO) films deposited on the polyethyene terephthalate (PET) substrate, which surface is treated with detergent solution. The ITO films are deposited on room temperature by direct current (DC) magnetron sputtering from a ceramic target of a 90% In-10% Sn alloy. The deposited opto-electric ITO films on PET with detergent treatment are 83.4% average visible transparency, and 5.8 × 10-4 Ω-cm resistivity, respectively. And then, we use the spin coating to form the polymer solar cell. Under optimal conditions of surface treatment and film deposition, the experimental result shows 2.12% of the …

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