2014 Oceans - St. John's最新文献_第9页

Development of a miniature, low-cost wave measurement solution 开发一种微型、低成本的波浪测量解决方案

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003217

Donal Kennedy, M. Walsh, B. O’flynn

引用次数: 5

Adaptive OFDMA for downlink underwater acoustic communications 用于下行水声通信的自适应OFDMA

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003120

Yuzhi Zhang, Yi Huang, L. Wan, Hao Zhou, Shengli Zhou, Xiaohong Shen, Haiyan Wang

引用次数: 15

Microalgae (diatom) production — The aquaculture and biofuel nexus 微藻(硅藻)生产-水产养殖和生物燃料的联系

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003242

C. Merz, K. Main

{"title":"Microalgae (diatom) production — The aquaculture and biofuel nexus","authors":"C. Merz, K. Main","doi":"10.1109/OCEANS.2014.7003242","DOIUrl":"https://doi.org/10.1109/OCEANS.2014.7003242","url":null,"abstract":"As fishing has become more industrialized and wild fish stocks increasingly depleted, aquaculture production has grown rapidly to address the shortfalls in capture fisheries and limitations to long-term aquaculture success. One such shortfall is the need to produce a suitable, sustainable, substitute for the capture fishery derived fish meal and oil based fish feeds currently in use, while maintaining the human protein requirements and health benefits of Long Chain (LC) omega-3 oils in farmed fish products. Fish derive the LC omega-3 oils from the food they consume, which ultimately comes from lower trophic level primary producers like microalgae. Using Integrated Aquaculture System (IAS) principles and practices, microalgae (diatoms) can be raised and processed directly for their Algal/Single Cell Oils (SCO), protein, and nutrients. Besides the use as an aquaculture feedstock, microalgae have been investigated for biofuel production because of higher photosynthetic efficiency, higher biomass production, and faster growth compared to other terrestrial energy crops. SCO based carbon-neutral renewable liquid biofuel solutions are currently under investigation but suffer from high production costs. Liquid biofuels have been considered to displace non-renewable, petroleum-derived transport fuels of limited availability which contribute to climate change via greenhouse gas (GHG) emissions. The current high cost constraint of SCO production could be alleviated through explored water-energy-food nexus synergies between the aquaculture and biofuels sector with a concentration on innovations in microalgae/SCO production, harvesting, and processing technologies. Interdisciplinary collaborations between engineers, biologists and chemists are essential for their successful development.","PeriodicalId":368693,"journal":{"name":"2014 Oceans - St. John's","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132080456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

BOG ventilation and combustion in re-liquefaction plants of LNG carriers LNG运输船再液化装置BOG通风与燃烧

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003288

Xin Cheng, Azizur Rahman

{"title":"BOG ventilation and combustion in re-liquefaction plants of LNG carriers","authors":"Xin Cheng, Azizur Rahman","doi":"10.1109/OCEANS.2014.7003288","DOIUrl":"https://doi.org/10.1109/OCEANS.2014.7003288","url":null,"abstract":"A liquefied natural gas (LNG) carrier is designed to transport LNG over a long distance. During transportation, the leakage of boil-off gas (BOG) along with poor ventilation can pose an explosion risk. The traditional method for dealing with the BOG is to burn the gas to power the ship. As an alternative method, re-liquefaction plants on board re-liquefy the vapours back to the cargo tanks. This project will characterize the technical issues associated with fire protection in a confined space where LNG boil-off re-liquefaction takes place and will demonstrate what the appropriate ventilation rate in an emergency is. In addition, the CFD software (ANSYS CFX) is applied to simulate the ventilation and burning of boil-off gas in the on board re-liquefaction plant to ensure the safety of the cargo tanks for the worst case scenario. The traditional method for dealing with the boil-off gas (BOG) on board an LNG carrier is to burn the gas to power the ship. As an alternative method, re-liquefaction plants on board re-liquefy the vapour back to the cargo tanks [1]. In the last few years, the introduction of LNG re-liquefaction systems has given ship owners a choice of fuels and provides engine redundancy. Nevertheless, flammable natural gas is processed in both methods. Due to the inherent properties of a ship's structure, the re-liquefaction system, gas combustion unit, pipelines, etc. are located in the space enclosed under the deck. Under certain circumstances the leakage of natural gas, along with poor ventilation, can pose an explosion risk. Unfortunately, limited industry codes have been developed for fire protection in the cabin where the innovative LNG re-liquefaction system is located. The purpose of this project is to demonstrate the leaking and burning of boil-off gas in the on board re-liquefaction plant to ensure the safety of the cargo tanks for the worst case scenario by using CFD simulation software.","PeriodicalId":368693,"journal":{"name":"2014 Oceans - St. John's","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133882805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

A comparative study on the performances of the DF techniques using a single acoustic vector sensor 单一声矢量传感器下DF技术性能的比较研究

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003023

A. Gunes, M. B. Guldogan, A. Bereketli

引用次数: 4

Analysis of the accuracy of a LBL-based underwater localization procedure 基于lbl的水下定位精度分析

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003093

A. Turetta, G. Casalino, E. Simetti, Alessandro Sperindé, Sandro Torelli

引用次数: 14

The impact of link orientation in underwater optical wireless communication systems 链路方向对水下光无线通信系统的影响

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003030

Laura J. Johnson, R. Green, M. Leeson

{"title":"The impact of link orientation in underwater optical wireless communication systems","authors":"Laura J. Johnson, R. Green, M. Leeson","doi":"10.1109/OCEANS.2014.7003030","DOIUrl":"https://doi.org/10.1109/OCEANS.2014.7003030","url":null,"abstract":"Underwater optical wireless has two distinct modes of communication depending on the choice of transmitter technology; short-ranged dispersive LED links (<;20m) and longdistance, narrow laser links. In both cases, existing propagation models use a single-value estimation of attenuation but this is not accurate for the latter. Changes in attenuation are caused by variable composition where the natural Gaussian profile of chlorophyll concentration with depth is the biggest contributing factor. With this in mind, this research looks at how varying the orientation of communication affects the average transmission for longer ranged underwater optical links. This is repeated for areas with low, medium and high levels of surface turbidity at 50m depth increments. Highest attenuation in found in links which have the largest portion transmitted through a chlorophyll peak, this occurs between 15-45° for both high and mid turbidity levels which correspond to the peaks below 0m and 50m respectively. This study also calculates how seawater refractive index gradients with depth alter the beam direction for different optical wireless links at angles to the vertical. It is found that angles closer to the vertical undergo higher displacements from their receivers as the gradient over which they are communicating is greater.","PeriodicalId":368693,"journal":{"name":"2014 Oceans - St. John's","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124013649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Variable buoyancy control for a bottom skimming autonomous underwater vehicle 掠底自主水下航行器的可变浮力控制

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003058

Anthony H. Sylvester, J. Delmerico, A. Trimble, B. Bingham

引用次数: 4

Kalman tracking of ocean current field based on distributed sensor network 基于分布式传感器网络的海流场卡尔曼跟踪

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003157

Ying Zhang, Jiamin Huang, Hangfang Zhao, Wen Xu

引用次数: 2

Performance of the Polar Fourier transform for ocean wave spectrum estimation from marine radar 极地傅里叶变换在海洋雷达海浪谱估计中的性能

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003159

Al-Abbass Y. Al-Habashneh, C. Moloney, E. Gill

引用次数: 1