Journal of Marine Science and Technology最新文献_第9页

A methodology for statistical mean wave climate regime characterisation in oceanic islands: the case of the southern coast of Tenerife 海洋岛屿统计平均波浪气候状态特征的方法:以特内里费岛南部海岸为例

4区工程技术

Journal of Marine Science and Technology Pub Date : 2023-01-01 DOI: 10.51400/2709-6998.2707

Emilio Megías, Manuel García-Román

{"title":"A methodology for statistical mean wave climate regime characterisation in oceanic islands: the case of the southern coast of Tenerife","authors":"Emilio Megías, Manuel García-Román","doi":"10.51400/2709-6998.2707","DOIUrl":"https://doi.org/10.51400/2709-6998.2707","url":null,"abstract":"Oceanic islands of volcanic origin tend to have peculiar characteristics, such as: exposure to many wave directions; grouping in archipelagos; steep coastal slopes; and small coastal shelves. All these features require certain considerations in wave climate studies. These types of studies, when wave spectra are not available and have to be performed with parametric data, can be unreliable without an adequate systematic treatment. In this work we propose a methodology consisting of pre-classification according to the peak period and subsequent separation into different sectors according to the geographical fetch. The island of Tenerife is the case study, and in particular the waves reaching its southern coast. Data from the existing deep-water buoy have been used in this work. A range of fetch lengths between the few miles of distance to the neighbouring islands, and more than 5,500 nautical miles that separate it from the Antarctic region have been considered. The dominant type of waves and the direction of provenance in each season of the year have been characterised. The proposed methodology has been designed to be applied to any oceanic archipelago with similar characteristics to those mentioned above.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135954550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predefined-time Neural Sliding Mode Control based Trajectory Tracking of Autonomous Surface Vehicle 基于预定义时间神经滑模控制的自动水面车辆轨迹跟踪

4区工程技术

Journal of Marine Science and Technology Pub Date : 2023-01-01 DOI: 10.51400/2709-6998.2697

Han Xue, Shulin Li

{"title":"Predefined-time Neural Sliding Mode Control based Trajectory Tracking of Autonomous Surface Vehicle","authors":"Han Xue, Shulin Li","doi":"10.51400/2709-6998.2697","DOIUrl":"https://doi.org/10.51400/2709-6998.2697","url":null,"abstract":"With the progress and development of modern industry, it is urgent to develop a more general and mature predefined time control theory system for uncertain nonlinear systems and apply it to practical engineering systems. Therefore, a novel predefined-time sliding mode control is designed to improve the slow convergence speed of asymptotically convergent controllers and finite-time convergent controllers affected by the initial state of the system. The proposed control approach is proved to converge from the initial value to the balance position using Jensen's inequality and Liapunov theorem. The proposed control method can deal with the ship motion system having six Degree-Of-Freedom (DOF) under external disturbance and parameter uncertainty. Furthermore, there are several application scenarios to simulate the proposed algorithm, such as the ship which is required to achieve ideal control accuracy in a short and fixed time. Alternatively, an unmanned ship is required to arrive at the desired location within the specified time. To sum up, this algorithm can extend some existing theoretical results on finite-time and fixed-time control to the predefined-time case.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135954202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Path Planning of UAV Navigation Mark Inspection Using a K-means Clustering ACA 基于k均值聚类ACA的无人机航标检测路径规划

4区工程技术

Journal of Marine Science and Technology Pub Date : 2023-01-01 DOI: 10.51400/2709-6998.2705

Jiaqi Li, Weifeng Li, Wenting Zhang

引用次数: 0

Study on Legal Issues of Ocean Fishing in China 中国海洋渔业法律问题研究

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2022-06-13 DOI: 10.30564/jms.v4i2.4454

Yan-jing Sun

{"title":"Study on Legal Issues of Ocean Fishing in China","authors":"Yan-jing Sun","doi":"10.30564/jms.v4i2.4454","DOIUrl":"https://doi.org/10.30564/jms.v4i2.4454","url":null,"abstract":"“The 21st century is the century of the ocean.” In recent years, China has paid more and more attention to the promotion and development of the marine industry, especially the ocean fishery has brought immeasurable economic benefits to China. The development of the marine field is becoming more and more important in the national political, economic and cultural development. All coastal countries have included marine development in their national development strategies and continuously improved their marine legislation under the provisions of the United Nations Convention on the law of the sea. China’s pelagic fishing began in 1985, but because China’s pelagic fishing started too late, after the entry into force of the United Nations Convention on the law of the sea at the end of 1994, nearly 36% of the richest high seas on earth became the exclusive economic zone of coastal countries, and the development space of China’s pelagic fishing has become very limited. After just more than 30 years of development, ***. However, before that, China’s pelagic fishing was still subject to the dual norms of international conventions and domestic laws, and China had not yet formulated a special law on pelagic fishing, and there were still many deficiencies in the legal system norms of pelagic fishing. Therefore, the biggest problem facing China’s pelagic fishery is how to better develop the marine industry under the system of laws and regulations, drive the coordinated economic development, provide legal guidance and help for pelagic fishermen, and provide solid technical support for building a marine power with Chinese characteristics.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74700161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biological Invasions in Marine Ecosystems: Amphipods (Crustacea: Amphipoda) as a Model Group 海洋生态系统中的生物入侵:片脚类(甲壳类:片脚类)作为一个模式群

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2022-06-13 DOI: 10.30564/jms.v4i1.4564

M. P. Cabezas

引用次数: 0

UXO Assessment on the Romanian Black Sea Coast 罗马尼亚黑海沿岸未爆弹药评估

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2022-06-13 DOI: 10.30564/jms.v4i2.4497

Laurențiu-Florin Constantinoiu, E. Rusu, Maria Emanuela Mihailov

引用次数: 3

Agarase Production by Marine Pseudoalteromonas sp. MHS: Optimization, and Purification 海洋假互生单胞菌产琼脂酶MHS:优化与纯化

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2022-01-24 DOI: 10.30564/jms.v4i1.3875

Mona M. Sharabash, Samia S. Abouelkheir, Mona E. M. Mabrouk, H. Ghozlan, S. Sabry

{"title":"Agarase Production by Marine Pseudoalteromonas sp. MHS: Optimization, and Purification","authors":"Mona M. Sharabash, Samia S. Abouelkheir, Mona E. M. Mabrouk, H. Ghozlan, S. Sabry","doi":"10.30564/jms.v4i1.3875","DOIUrl":"https://doi.org/10.30564/jms.v4i1.3875","url":null,"abstract":"Agar is an essential polysaccharide that has been utilized in numerous fields. Many kinds of literature have been published regarding agarolytic microorganisms’ isolation and agarases biochemical studies. In this search, a local marine agarolytic bacterium associated with marine alga Ulva lactuca surface was isolated and identified as Pseudoalteromonas sp. MHS. The agarase production was parallel to the growth of Pseudoalteromonas sp. MHS as cells displayed a lag phase (2 h), subsequently an exponential growth that prolonged till 10 h where maximum growth (OD550nm = 3.9) was achieved. The enzyme activity increased rapidly as cells increased exponentially where the maximum activity of 0.22 U/mL was achieved after 8h and remained constant till 12 h during the stationary phase of growth. Agarase production was optimized using Plackett-Burman statistical design by measuring enzyme activity as a response and the design was validated using a verification experiment; the activity of the enzyme increased from 0.22 U/mL to 0.29 U/mL. Pseudoalteromonas sp. MHS agarase was partially purified and its molecular weight (MW) was determined by SDSPAGE (15-25 kDa). Agarase showed approximately 94% of its activity at 40 °C. The enzyme stability decreased as the temperature increased; the enzyme could retain about 98, 90, 80, 75, and 60% of its activity at 20, 30, 40, 50, and 60 °C, respectively. Biomass of the red alga Pterocladia capillacea proved to be a suitable substrate for agarase production using Pseudoalteromonas sp. MHS; the enzyme activity recorded after 24 h of incubation was 0.35 U/mL compared to 0.29 U/mL from the optimized medium.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2022-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81478264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Climate Change Effects and Marine Renewable Energy Important Topics Targeted by the Journal of Marine Science 气候变化影响和海洋可再生能源《海洋科学杂志》瞄准的重要主题

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2022-01-21 DOI: 10.30564/jms.v4i1.4366

E. Rusu

引用次数: 1

Analysis of Shoreline Changes in Ikoli River in Niger Delta Region Yenagoa, Bayelsa State Using Digital Shoreline Analysis System (DSAS) 基于数字海岸线分析系统(DSAS)的尼日尔三角洲叶纳戈阿伊科利河岸线变化分析

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2022-01-12 DOI: 10.30564/jms.v4i1.4197

Egai Ayibawari Obiene, E. Rowland, Inko-Tariah Ibiso Michael

{"title":"Analysis of Shoreline Changes in Ikoli River in Niger Delta Region Yenagoa, Bayelsa State Using Digital Shoreline Analysis System (DSAS)","authors":"Egai Ayibawari Obiene, E. Rowland, Inko-Tariah Ibiso Michael","doi":"10.30564/jms.v4i1.4197","DOIUrl":"https://doi.org/10.30564/jms.v4i1.4197","url":null,"abstract":"The use of Digital Shoreline Analysis System was used to determine shoreline changes in Ikoli River, Yenagoa, Bayelsa State. Shoreline data were extracted from satellite imagery over thirty years (1991-2021). The basis of this study is to use Digital Shoreline Analysis System to determine erosion and accretion areas. The result reveals that the average erosion rate in the study area is 1.16 m/year and the accretion rate is 1.62 m/year along the Ikoli River in Ogbogoro Community in Yenagoa, Bayelsa State. The mean shoreline length is 5.24 km with a baseline length of 5.2 km and the area is classified into four zones to delineate properly area of erosion and accretion based on the five class of Linear regression rate, endpoint rate and weighted linear rate of which zone I contain very high erosion and high erosion with an area of landmass 255449.93 m2 of 38%, zone II contain moderate accretion, very high accretion and high accretion with a land area of 1666816.46 m2 with 24%, zone III has very high erosion and high erosion with an area of landmass 241610.85 m2 of 34 % and zone IV contain moderate accretion and high accretion with land area 30888.08 m2 with 4%. Out of the four zones, zone I and II were found to be eroding with 72% and zone II and IV contain accretion with 28%. The result shows that 44% of the area have been eroded. Therefore, coastal engineers, planners, and shoreline zone management authorities can use DSAS to create more appropriate management plans and regulations for coastal zones and other coastal parts of the state with similar geographic features.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2022-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80932686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Towards approval of autonomous ship systems by their operational envelope. 通过其操作范围批准自主船舶系统。

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2022-01-01 Epub Date: 2021-04-24 DOI: 10.1007/s00773-021-00815-z

Ørnulf Jan Rødseth, Lars Andreas Lien Wennersberg, Håvard Nordahl

{"title":"Towards approval of autonomous ship systems by their operational envelope.","authors":"Ørnulf Jan Rødseth, Lars Andreas Lien Wennersberg, Håvard Nordahl","doi":"10.1007/s00773-021-00815-z","DOIUrl":"https://doi.org/10.1007/s00773-021-00815-z","url":null,"abstract":"<p><p>Current guidelines for approval of autonomous ship systems are focused on the ships' concrete operations and their geographic area. This is a natural consequence of the link between geography and the navigational complexity, but moving the ship to a new area or changing owners may require a costly re-approval. The automotive industry has introduced the Operational Design Domain (ODD) that can be used as a basis for approval. However, the ODD does not include the human control responsibilities, while most autonomous ship systems are expected to be dependent on sharing control responsibilities between humans and automation. We propose the definition of an operational envelope for autonomous ship systems that include the sharing of responsibilities between human and automation, and that is general enough to allow approval of autonomous ship systems in all geographic areas and operations that falls within the envelope. We also show how the operational envelope can be defined using a system modelling language, such as the unified modelling language (UML).</p>","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s00773-021-00815-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38938174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20