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Wave energy extraction by an OWC device in the presence of a porous bottom

Energy Reports 2024年 11卷 5602-5618页

作者： Naik, Nikita Kushwaha, Aman Kumar Behera, Harekrushna Tsai, Chia-Cheng Department of Mathematics SRM Institute of Science and Technology Kattankulathur Chennai603203 India Department of Mathematics Indian Institute of Technology Indore Indore453552 India Center of Excellence for Ocean Engineering National Taiwan Ocean University Keelung202301 Taiwan Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung202301 Taiwan

The present study explores the effects of a porous bed on an oscillating water column (OWC) device under the assumptions of the linearized water wave theory and small-amplitude of the surface waves. The velocity potentials in each region have been determined by using the far-field and boundary conditions. To tackle the physical problem, two different mathematical techniques have been employed: the boundary element method (BEM) and the matched eigenfunction expansion method (EEM). The findings of the study are validated by the existing literature. The outcomes of the numerical results and analytical results are in good agreement. It is noted that as the width of the chamber increases, there is an increase in radiation conductance and a decrease in radiation susceptance. The zero efficiencies are observed multiple times as the width of the OWC device increases with respect to the dimensionless wavenumber. Moreover, the study reveals that full efficiency can be obtained by an OWC device over a porous bed for certain wave and structural parameters as obtained in the presence of an impermeable bottom. The proposed model can help to design and develop a successful OWC device. © 2024

关键词： Boundary element method

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Analysis of water wave interaction with multiple submerged semi-circular porous structures

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Archive of Applied Mechanics 2023年第7期93卷 2693-2709页

作者： Tsai, Chia-Cheng Behera, Harekrushna Hsu, Tai-Wen Center of Excellence for Ocean Engineering National Taiwan Ocean University Keelung202301 Taiwan Department of Mathematics SRM Institute of Science and Technology Kattankulathur Tamil Nadu 603203 India Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung202301 Taiwan Department of Harbor and River Engineering National Taiwan Ocean University Keelung202301 Taiwan

The impact of an array of bottom-mounted semi-circular breakwaters on wave scattering and trapping is investigated. Under the assumption of linear water wave theory, a computational solution is developed using the methods of eigenfunction expansion and multi-domain boundary element. In order to understand how different structural and wave characteristics affect wave flow, the reflection, transmission and dissipation factors are evaluated and investigated. The study reveals that the Bragg reflection happens when a series of porous semi-circular breakwaters scatter waves. In addition, the presence of four structures causes nearly 80 % of the wave energy to dissipate. As the number of semi-circular breakwaters rises, the hydrodynamic forces acting on the impermeable sea wall greatly reduce. The study concludes that the number of structures, radius and porous-effect parameters of the structures plays a vital role in wave reflection, reducing the hydrodynamic load on the impenetrable sea wall. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： Boundary element method

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Flexural-gravity wave interaction with undulating bottom topography in the presence of uniform current: An asymptotic approach

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Applied Mathematical Modelling 2024年 133卷 41-64页

作者： Barman, Koushik Kanti Chanda, Ayan Tsai, Chia-Cheng Mondal, Sandipan Center of Excellence for Ocean Engineering National Taiwan Ocean University Keelung Taiwan Department of Mathematics Birla Institute of Technology Mesra Jharkhand India Department of Ocean Engineering and Naval Architecture Indian Institute of Technology West Bengal Kharagpur India Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung Taiwan Department of Environmental Biology and Fishery Science National Taiwan Ocean University Keelung Taiwan

Using an asymptotic method, this article deals with flexural-gravity wave scattering with undulating bottom topography, including the effect of uniform currents. The interest in this problem lies in developing second-order solutions using the Fourier transform, which minimises the error gap between first and second-order solutions. The present method allows the physical processes involved in the sea-bed topography, uniform current, plate-covered surface, and wave interaction to be studied. Specifically, we observe Bragg resonance between the flexural-gravity waves and the bottom ripples, which are associated with the reflection of incident wave energy. We examine the effects of wave current and emphasise how crucial the asymptotic expansion method is to the emergence of the current response. We demonstrate that bottom topography dominates the effects of Bragg resonance for depth Froude numbers valued at 0.8 or less. Further, most reflected wave components have their frequencies shifted by the current, and wave action conservation causes reflected wave energy to be enhanced for following currents. Using the Joint North Sea Wave Observation Project spectrum and the discrete Fourier transform, the theory derived in the frequency domain is shown in the time domain to analyse wave propagation through the whole system. © 2024

关键词： Time domain analysis

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Hindcast of oil spill pollution in the East China Sea in January 2018

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Proceedings of the Institution of Mechanical Engineers Part M: Journal of engineering for the Maritime Environment 2024年第1期238卷 90-101页

作者： Nguyen, Thi-Hong-Hanh Hou, Tien-Hung Pham, Hai-An Tsai, Chia-Cheng Department of Civil Engineering Vietnam Maritime University Hai Phong Viet Nam General Education Center Tainan University of Technology Tainan Taiwan Department of Harbor and River Engineering National Taiwan Ocean University Keelung Taiwan Institute of Marine Environment and Resources Vietnam Academy of Science and Technology Ha Noi Viet Nam Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung Taiwan Center of Excellence for Ocean Engineering National Taiwan Ocean University Keelung Taiwan

In this study, an integrated model is developed for studying the Sanchi oil spill event, which occurred in the East China Sea in January 2018. The results of the Advanced Research Weather Research and Forecasting model (WRF-ARW) as well as the Princeton ocean Model (POM) are used for meteorological forecasting and the hydrodynamic simulations, respectively. These data are adopted as inputs for the OpenOil, a sub-module of OpenDrift, for the oil spill model. Some reference experiments are examined for short-term hindcast. The satellite image is used to validate the numerical result. The oil slicks of the satellite image and the numerical result are of similar shapes. Quantitatively, the simulated oil slick and that from the satellite image are located closely and have similar dimensions of 56 km by 34 km and 54 km by 29 km, respectively. It is found that the accurate results can be obtained by the proposed integrated model with the high-frequency (hourly) and high-spatial-resolution data as inputs, and the wind drift factor has to be added. The long-term 1-month simulation showed that most of the oil particles would move to the northeast of the sinking location and be trapped by the Kuroshio current. © IMechE 2023.

关键词： Oil spills

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Mesoporous silica nanoparticles with dual-targeting agricultural sources for enhanced cancer treatment via tritherapy

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RSC Advances 2023年第28期13卷 19079-19090页

作者： Huang, Yu-Ya Lee, Zui-Harng Chang, Kai-Chi Wu, Zhi-Yuan Lee, Cheng-Chang Tsou, Min-Hsuan Lin, Hsiu-Mei National Taiwan Ocean University Department of Bioscience and Biotechnology No. 2 Beining Rd. Zhongzheng Dist. Keelung City202 Taiwan National Taiwan Ocean University Bachelor Degree Program in Marine Biotechenology Taiwan National Taiwan Ocean University Center of Excellence for the Oceans Taiwan National Taiwan Ocean University Center of Excellence for Ocean Engineering Taiwan

In this study, we introduced dual-targeting folic acid (FA) and hyaluronic acid (HA) modified on the surface of rice husk mesoporous silica nanoparticles (rMSNs). The rMSNs were employed as a drug delivery system loaded with camptothecin (CPT) as a model drug, Eu3+ ions as a photosensitizer for photodynamic therapy (PDT), bismuth (Bi) for photothermal therapy (PTT), and Gd3+ ions for magnetic resonance imaging (MRI) to develop novel nanoparticles, rMSN-EuGd-Bi@CPT-HA-FA, with dual-targeted function and triple therapy for cancer treatment. The results of the cell cytotoxicity experiment showed that the A549 cancer cells had a survival rate of approximately 35% when treated with 200 μg mL−1 of rMSN-EuGd-Bi@CPT-HA-FA under 808 nm irradiation for 15 min. The dual-targeted function and synergistic treatment of CPT, PTT, and PDT were also responsible for the 20% survival rate of the A549 cancer cells treated with 200 μg mL−1 of rMSN-EuGd-Bi@CPT-HA-FA under 808 nm irradiation for 30 min. The results showed that rMSN-EuGd-Bi@CPT-HA-FA can effectively combine chemotherapy (through CPT), PDT, and PTT for cancer treatment. © 2023 The Royal Society of Chemistry.

关键词： Hyaluronic acid

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Visibility analysis by light attenuation ratio recorded with portable camera at the full-scale hot smoke test site

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International Journal of Ventilation 2023年第3期22卷 273-288页

作者： Su, ChungHwei Shih, ChiaYuan Wang, ShiuanCheng Tsai, MingJe Department of Safety Health and Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung City Taiwan Tainan City Government Fire Bureau Tainan City Taiwan Bachelor Degree Program of Fire Safety Tajen University Pingtung County Taiwan

Some countries have enacted the full-scale hot smoke test standards to verify the effectiveness of smoke extraction systems. Unfortunately, the judgment of most performed tests is based on vision and lacks scientific value. It is important to establish a scientific and quantifiable measurement system for visibility judgment in a large space. This paper analyzed the visibility values obtained through the light attenuation in a full-scale hot smoke test site. The quadratic regression relationships between the gray scale values and the attenuation ratios were derived. The visibility of the test site can be also obtained by grayscale analysis of recorded images. A qualified emergency direction light was used as a light source, and a closed-circuit television and a portable camera were adopted for image recording. These images were converted into grayscale pictures to obtain the gray scale values at the center of the bright spot. By comparing with the light attenuation ratio of the quantifiable measurement equipment in front of the light source, the results showed excellent relevance and demonstrated the applicability of the captured images. © 2022 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Visibility

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Highly selective Cu2+ detection with a naphthalimide-functionalised pillararene fluorescent chemosensor

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Organic and Biomolecular Chemistry 2023年第4期22卷 745-752页

作者： Chang, Rong Chen, Chan-Yu Gao, Liya Li, Yana Lee, Zui-Harng Zhao, Hongxia Sue, Andrew C.-H. Chang, Kai-Chi College of Chemistry and Chemical Engineering Xiamen University 422 Siming South Rd Siming District Fujian Province Xiamen361005 China Bachelor Degree Program in Marine Biotechnology National Taiwan Ocean University Keelung202 Taiwan School of Pharmaceutical Science and Technology Tianjin University 92 Weijin Rd Nankai District Tianjin300072 China

Ligand 1, a rim-differentiated pillar[5]arene macrocycle modified with five naphthalimide groups through click chemistry, serves as an effective ratiometric fluorescent chemosensor for Cu2+. In contrast to the monomeric naphthalimide control compound 2, which shows only monomer emission, ligand 1 demonstrates dual emission characteristics encompassing both the monomer and excimer of the naphthalimide moieties. The binding properties of ligand 1 toward 15 different metal ions were systematically investigated in CH2Cl2/CH3CN (v/v, 1 : 1) by UV-vis and fluorescence spectroscopy. Remarkably, ligand 1 exhibits exceptional selectivity for Cu2+ ions. Upon complexation with Cu2+, the excimer emission of ligand 1 diminishes, concomitant with an enhancement of its monomer emission. The binding ratio for 1·Cu2+ was determined to be 1 : 1, with an association constant of (3.39 ± 0.40) × 105 M−1 calculated using a nonlinear least-squares curve-fitting method. Furthermore, the limit of detection (LOD) was found to be 185 ± 7 nM. Our results from 1H NMR titration, high-resolution mass spectrometry analysis and density functional theory calculations of 1·Cu2+ suggest synergistic coordination between Cu2+ and the triazole groups on ligand 1. © 2024 The Royal Society of Chemistry.

关键词： Ligands

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Meshless generalized finite difference method with a domain-selection method for solving degenerate boundary problems

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engineering Analysis with Boundary Elements 2023年第1期152卷 185-193页

作者： Huang, Ji Lyu, Hong-Guan Fan, Chia-Ming Chen, Jiahn-Horng Naval Architecture and Shipping College Guangdong Ocean University Zhanjiang524088 China School of Ocean Engineering and Technology Sun Yat-sen University Zhuhai519082 China Doctoral Degree Program in Ocean Engineering Technology National Taiwan Ocean University Keelung20224 Taiwan Department of Harbor and River Engineering National Taiwan Ocean University Keelung20224 Taiwan Shih Yen-Ping Center for Underwater Technology National Taiwan Ocean University Keelung20224 Taiwan National Academy of Marine Research Kaohsiung80661 Taiwan

This paper is dedicated to presenting a combined Generalized Finite Difference Method (GFDM) and Domain-Selection Method (DSM) approach for solving degenerate boundary problems which are usually encountered in engineering simulations. Compared with traditional Domain-Decomposition Method (DDM), the most critical advantage of the present GFDM-DSM is that it is entirely free from matching continuous boundary conditions for different parts of the fluid domain of interest, which is sometimes hard to perform for specific situations. Instead, the only prerequisite of the present GFDM-DSM is to identify which sub-domain each computational node belongs to, and then a linear algebraic system can be assembled according to the pattern of domain-selection. Four benchmarks are performed to validate the convergence and accuracy of the present GFDM-DSM. It is shown that the present GFDM-DSM holds satisfactory accuracy for solving degenerate boundary problems. In particular, the present DSM is a flexible strategy since it can be also combined with other localized domain-type meshless methods in practical applications. © 2023 Elsevier Ltd

关键词： Domain decomposition methods

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Comments on a Computation-Transferable Authenticated Key Agreement Protocol for Smart Healthcare

Comments on a Computation-Transferable Authenticated Key Agr...

引用

9th International Conference on Applied System Innovation, ICASI 2023

作者： Chang, Ya-Fen Tsai, Chung-Yi Tai, Wei-Liang National Taichung University of Science and Technology Department of Computer Science and Information Engineering Taichung Taiwan National Taichung University of Science and Technology Bachelor Degree Program of Artificial Intelligence Taichung Taiwan

ISBN: (纸本)9798350398380

Recently, Wang et al. proposed a computationally transferable authenticated key agreement protocol for smart healthcare by adopting the certificateless public-key cryptography. They claimed that their protocol could ensure privacy, resist various attacks, and possess superior properties. After analyzing their protocol, we find that it suffers from some flaws. Firstly, user privacy is not ensured as claimed. Secondly, some statements are inaccurate or missing. Thirdly, it cannot resist DoS attack. In this paper, the details of how these flaws threaten Wang et al.'s protocol are shown. © 2023 IEEE.

关键词： Denial-of-service attack

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PV System Power Model Application in Smart Cities 2

PV System Power Model Application in Smart Cities

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2nd IEEE International Conference on Knowledge Innovation and Invention, ICKII 2019

作者： Huang, Chiou-Jye Hwang, Min-Chan Chen, Hsin-Chuan Kuo, Ping-Huan School of Electrical Engineering and Automation Jiangxi University of Science and Technology Ganzhou China University of Electronic Science and Technology of China Zhongshan Institute Zhongshan China Computer and Intelligent Robot Program for Bachelor Degree National Pingtung University Pingtung Taiwan

ISBN: (纸本)9781728101101

The photovoltaic (PV) system energy generation is closely related to climate conditions, installation site, and system design. In this paper, a simple energy generation model is proposed and established by means of module temperature and solar irradiation, module temperature coefficient, module rated power, number of modules, and three correction coefficients including temperature derating coefficient, inverter conversion loss coefficient, and other loss coefficients. The experiment results show that the estimation model proposed in this paper has high accuracy using the Mean Absolute Percentage Error (MAPE) model as the evaluation index, the estimation model MAPE is 6.75%, while the PV SYST software simulation has MAPE of 11.90%. According to international MAPE evaluation standards, the method proposed in this paper has higher accuracy level than PV SYST software. This model can be used for the estimation of energy generation when installing solar PV systems, and can be used for the reasonable assessment of PV system long-term power generation, to predict system power generation anomalies, and reduce system abnormalities caused by downtime losses, and increase investment efficiency. © 2019 IEEE.

关键词： Smart city

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