Journal articles on the topic 'Marine resource extraction'
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1
Bryden, Ian G., and Scott J. Couch. "ME1—marine energy extraction: tidal resource analysis." Renewable Energy 31, no. 2 (February 2006): 133–39. http://dx.doi.org/10.1016/j.renene.2005.08.012.
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Figueroa, Félix L. "Mycosporine-Like Amino Acids from Marine Resource." Marine Drugs 19, no. 1 (January 4, 2021): 18. http://dx.doi.org/10.3390/md19010018.
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In the last 10 years, a great number of publications (both regular papers and reviews) have been published on the interesting molecules—mycosporine-like amino acids (MAAs). Despite significant advances in the research of MAAs, current overviews in the recent publications involving MAA research still need reporting. The aim of this Special Issue is to join, as an interdisciplinary approach, the photochemical and photobiological aspects, with emphasis on new natural resources to obtain both algae and zooplankton MAAs, advances in methodology of extraction and chemical identification of new MAAs. Finally, this Special Issue reviews the bioactivities of MAAs including UVR screen, antioxidant, immunostimulant, growth factor, DNA protection, inhibition of collagenase, elastase and hyaluronidase, and anti-photoaging, among others, and their potential use as nutracosmeceutic molecules (i.e., oral and topic photoprotector).
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Bourban, Sébastien E., Noémie D. C. Durand, Tom T. Coates, Lindsay Gill, Michael Harper, and Richardson Stephen. "MODELLING TIDAL ENERGY RESOURCE AND EXTRACTION." Coastal Engineering Proceedings 1, no. 32 (January 31, 2011): 6. http://dx.doi.org/10.9753/icce.v32.posters.6.
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A number of areas around the UK coast are being investigated as possible locations for tidal energy harnessing. Detailed assessment using regional hydrodynamic modelling supported by field measurements can be used to quantify the energy resource and to determine limitations in the potential development area, including those due to the interactions between waves and tides. Two case studies illustrate the techniques applied and the implications for tidal device deployment: (a) Marine Current Turbines (MCT) are planning to deploy an array of their SeaGen tidal devices off the northwest Anglesey coast, UK; and (b) THETIS Energy Ltd are planning a development off the north Northern Ireland coast in the North Channel.
The sites are characterised by moderately severe wave conditions, strong currents, and complex geomorphologic features, yielding highly variable and spatially complex, tidal range dependent current patterns. The regional hydrodynamic models (based on the TELEMAC system, an unstructured finite element solver from Electricité de France, now publicly distributed under an open source license) were calibrated against good quality field data for both sites, and captured the strong variability of the currents to a grid resolution of about 10 m over 30-day tidal cycles. Some areas were found to have strong currents on the flood tide but much weaker currents on the ebb, and vice versa and directions were not necessarily opposite. Areas with appropriate water depths, consistently good flow characteristics and, therefore, commercially attractive energy resource comprised only parts of the pre-selected sites.
Off the northwest Anglesey coast, the TELEMAC-2D hydrodynamic model was complemented with a third generation wave transformation model. The local wave conditions are strongly affected by currents, giving rise to potentially dangerous conditions for construction and maintenance operations, as well as complex forces on the energy devices. By simulating the power take-off and physical characteristics of the MCT SeaGen devices, the hydrodynamic model was used to assess the impact of individual devices on the current regime and the actual energy available from the proposed arrays taking account of wake effects (Figure 1). The extent and intensity of the wake areas were calibrated to some degree against field data obtained from the MCT Lynmouth SeaFlow deployment (installed May 2003). Wakes could extend over a significant area, requiring careful placement of the individual devices within each array to avoid reduction in power generation.
Off the north Northern Ireland coast, the TELEMAC-3D hydrodynamic model was used to produce maximum and average kinetic power density maps to identify useful site survey locations. The presence of an amphidromic point not far from the site, with virtually no tidal range yet strong currents, was correctly reproduced by the hydrodynamic model. The modelling study followed or exceeded the Assessment of Tidal Energy Resource guidance set by the European Marine Energy Centre for a full feasibility stage. In particular, comparisons with observed bed-mounted current data showed differences in maximum speed at various elevations throughout the water column within 5% or better at two of the three sites (spring tide currents).
Numerical modelling has proven to be effective and critical in investigating possible locations for tidal energy harnessing at a number of areas around the UK coast.
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Sørensen, Ann-Dorit Moltke, Adane Tilahun Getachew, and Charlotte Jacobsen. "Starfish (Asterias rubens) as a New Source of Marine Lipids: Effect of Season, Size and Oil Extraction Methods." Foods 11, no. 19 (September 27, 2022): 2998. http://dx.doi.org/10.3390/foods11192998.
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The increasing demand for oils that contain health-beneficial omega-3 fatty acids calls for new resources or better utilization of existing resources, such as side-streams or underutilized resources to maintain a sustainable fishery. Starfish has been, until recently, an unexploited resource with limited utilization. Currently, starfish is processed into starfish meal for feed. However, the content of bioactive compounds, such as omega-3 fatty acids and phospholipids, could make it a new source of marine oil containing omega-3 fatty acids for human consumption. The aim of this study was to map the composition of bioactive compounds in starfish and starfish meal at different harvesting times to elucidate the content and variation over seasons. The results showed that starfish is a good source of marine omega-3 fatty acids and rich in phospholipids. Some variation was observed in the composition, especially for EPA bound to phospholipids, which was significantly higher in the spring. Traditional extraction using heat and mechanical separation was not applicable to the starfish, and neither was enzyme-assisted extraction. On the other hand, the supercritical CO2 extraction method using EtOH as a co-solvent seemed to be a promising green technology for extracting not only non-polar lipids, but also polar lipids, such as phospholipids. However, the conditions for extraction need further optimization.
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Zhou, Haiyi, Pengcheng Jiao, and Yingtien Lin. "Emerging Deep-Sea Smart Composites: Advent, Performance, and Future Trends." Materials 15, no. 18 (September 17, 2022): 6469. http://dx.doi.org/10.3390/ma15186469.
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To solve the global shortage of land and offshore resources, the development of deep-sea resources has become a popular topic in recent decades. Deep-sea composites are widely used materials in abyssal resources extraction, and corresponding marine exploration vehicles and monitoring devices for deep-sea engineering. This article firstly reviews the existing research results and limitations of marine composites and equipment or devices used for resource extraction. By combining the research progress of smart composites, deep-sea smart composite materials with the three characteristics of self-diagnosis, self-healing, and self-powered are proposed and relevant studies are summarized. Finally, the review summarizes research challenges for the materials, and looks forward to the development of new composites and their practical application in conjunction with the progress of composites disciplines and AI techniques.
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Chettiar, Niranjwan, Sumesh Narayan, Jai Nendran Goundar, and Ashneel Deo. "Design of a Gorlov Turbine for Marine Current Energy Extraction." Applied Mechanics and Materials 772 (July 2015): 556–60. http://dx.doi.org/10.4028/www.scientific.net/amm.772.556.
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As fossil fuels near depletion and their detrimental side effects become prominent on ecosystems, the world searches renewable sources of energy. Marine current energy is an emerging and promising renewable energy resource. Marine current energy can be alternative energy source for electricity production. Many marine current converters are designed to tap marine current energy; however, Gorlov turbine proves to have minimum manufacturing and maintenance cost, hence giving desired power output. A 0.3m diameter and 0.6m long 3 bladed Gorlov turbine was designed, fabricated and test to analyse its performance. The turbine produces average power 15 W and proves to be quite efficient for marine current energy extraction.
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Carver, Rosanna. "Resource sovereignty and accumulation in the blue economy: the case of seabed mining in Namibia." Journal of Political Ecology 26, no. 1 (July 24, 2019): 381. http://dx.doi.org/10.2458/v26i1.23025.
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<p>Following its global emergence, the blue economy agenda is now touted as a mechanism through which the Republic of Namibia can achieve long-term sustainable and equitable growth. In (re)defining the ocean, seabed mining has been central to these discussions. Drawing on fieldwork and semi-structured interviews undertaken with key actors in Namibia and South Africa, between 2016 and 2017, as well as recent policy debates and discourse surrounding the potential extraction of marine phosphate in Namibia this article critically examines the framing of the marine environment as an extractive space. The blue economy presents opportunities for new forms of capitalist accumulation and this has resulted in struggles over who can accumulate in the marine sphere. This article therefore analyses the emerging and competing claims to sovereignty over this "new" resource frontier, including by state and non-state actors, and identifies which actors have been included or excluded from the blue economy agenda. In discussing sovereignty over this frontier and resources therein, it undertakes a rigorous analysis of the complications created by the ocean as a three-dimensional, voluminous, "borderless" space.</p><p><strong>Key Words: </strong>Namibia, seabed mining, sovereignty, frontier, blue economy, EEZ</p>
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Miao, Ying Xia, Shu Xun Wang, Lu Yang Li, Tian Xiang Jiang, and Jing Wang. "Marine Environment Impact Analysis and Countermeasures on Sea Water Utilization Project." Applied Mechanics and Materials 587-589 (July 2014): 882–85. http://dx.doi.org/10.4028/www.scientific.net/amm.587-589.882.
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Sea water utilization projects are catching attention as the seawater utilization industry continues to grow. This paper analyzes the marine environment impact from different kind of sea water utilization projects such as seawater desalination, direct seawater utilization and seawater chemical resource extraction, and brieflypresents relevant countermeasures.
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Waldner, Jeffrey, Jeffrey Reidenauer, Lora Turner, Paul Knorr, and Leighann Brandt. "BUILDING A NATIONAL SAND RESOURCE INVENTORY FOR THE US CONTINENTAL SHELF." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 88. http://dx.doi.org/10.9753/icce.v36.sediment.88.
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The future of coastal resilience or restoration plans which implement natural or nature-based features largely depends upon the identification of proximate and compatible offshore sand and gravel material. BOEM’s Marine Minerals Program (MMP) is multi-faceted, focusing on coordinated leasing of sediment for extraction, inventorying sediment resources through geological and geophysical surveys of the Outer Continental Shelf (OCS), and environmental studies and reviews to inform decisions.
However, on a national scale, little is known about the character, quantity, and location of sand resources on the OCS and the habitat it provides for biological communities. BOEM places a high priority on creating a comprehensive national sand resource inventory to meet BOEM’s mandate as stewards of all federal mineral resources on the OCS. This stewardship responsibility will be realized by proactively planning for the increasing demands for OCS resources and emergency needs as they arise.
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Starosielski, Nicole. "Resource Operations of the Ecological Digital Humanities." Publications of the Modern Language Association of America 131, no. 2 (March 2016): 401–9. http://dx.doi.org/10.1632/pmla.2016.131.2.401.
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Large-scale industrial processes and networks of extraction, slow violences wrought across toxic landscapes, and rapidly shifting atmospheric, oceanic, and hydrologic cycles are altering the conditions of human and nonhuman existence in ways that challenge the limits of existing media technologies. The last of these transformations—the fluctuating distributions of water—is the focus of this essay. Hydrologists are struggling to model and predict the intensities of drought, the changing supply of watersheds, the dispersions of chemicals through streams and rivers, and the failures of aging infrastructure. Water transports contaminants too small to identify by sight, requiring technologies that can register tiny particles on a massive scale. Water complicates boundary-making projects—it moves easily across local and regional zones, human and nonhuman bodies, and atmospheric, terrestrial, and marine ecologies. Global weather patterns and distribution infrastructures shape its circulation, yet its material effects depend greatly on local conditions.
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Zou, Zhaohui, Chao Chen, Zhisong Liu, Zili Zhang, Jintao Liang, Huixin Chen, and Liyan Wang. "Extraction of Aquaculture Ponds along Coastal Region Using U2-Net Deep Learning Model from Remote Sensing Images." Remote Sensing 14, no. 16 (August 17, 2022): 4001. http://dx.doi.org/10.3390/rs14164001.
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The main challenge in extracting coastal aquaculture ponds is how to weaken the influence of the “same-spectrum foreign objects” effect and how to improve the definition of the boundary and accuracy of the extraction results of coastal aquaculture ponds. In this study, a recognition model based on the U2-Net deep learning model using remote sensing images for extracting coastal aquaculture ponds has been constructed. Firstly, image preprocessing is performed to amplify the spectral features. Second, samples are produced by visual interpretation. Third, the U2-Net deep learning model is used to train and extract aquaculture ponds along the coastal region. Finally, post-processing is performed to optimize the extraction results of the model. This method was validated in experiments in the Zhoushan Archipelago, China. The experimental results show that the average F-measure of the method in the study for the four study cases reaches 0.93, and the average precision and average recall rate are 92.21% and 93.79%, which is suitable for extraction applications in aquaculture ponds along the coastal region. This study can quickly and accurately carry out the mapping of coastal aquaculture ponds and can provide technical support for marine resource management and sustainable development.
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Coppola, Daniela, Maria Oliviero, Giovanni Andrea Vitale, Chiara Lauritano, Isabella D’Ambra, Salvatore Iannace, and Donatella de Pascale. "Marine Collagen from Alternative and Sustainable Sources: Extraction, Processing and Applications." Marine Drugs 18, no. 4 (April 15, 2020): 214. http://dx.doi.org/10.3390/md18040214.
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Due to its unique properties, collagen is used in the growing fields of pharmaceutical and biomedical devices, as well as in the fields of nutraceuticals, cosmeceuticals, food and beverages. Collagen also represents a valid resource for bioplastics and biomaterials, to be used in the emerging health sectors. Recently, marine organisms have been considered as promising sources of collagen, because they do not harbor transmissible disease. In particular, fish biomass as well as by-catch organisms, such as undersized fish, jellyfish, sharks, starfish, and sponges, possess a very high collagen content. The use of discarded and underused biomass could contribute to the development of a sustainable process for collagen extraction, with a significantly reduced environmental impact. This addresses the European zero-waste strategy, which supports all three generally accepted goals of sustainability: sustainable economic well-being, environmental protection, and social well-being. A zero-waste strategy would use far fewer new raw materials and send no waste materials to landfills. In this review, we present an overview of the studies carried out on collagen obtained from by-catch organisms and fish wastes. Additionally, we discuss novel technologies based on thermoplastic processes that could be applied, likewise, as marine collagen treatment.
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Chzhu, Olga P., Daredzhan E. Araviashvili, and Irina G. Danilova. "Studying Properties of Prospective Biologically Active Extracts from Marine Hydrobionts." Emerging Science Journal 4, no. 1 (February 1, 2020): 37–43. http://dx.doi.org/10.28991/esj-2020-01208.
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Biologically active substances (BAS) extracted from marine hydrobionts are characterized by high diversity and efficiency. They are represented by carotenoids, phospholipids, saponins and other compounds possessing high antioxidant (AOA), antitumor, immunomodulatory, radioprotective, and hypolipidemic activities. Because of extremely high marine BAS activity, the BAS dose necessary for treatment and prevention of many diseases is very small. The aim of present work was to assess biological properties of BAS complexes extracted from Black Sea marine inverterbrates for their following using in pharmacological preparations including liposomal drug delivery. BAS complexes were extracted from marine invertebrate tissues by two-phase extraction in combination with ultrasonication. Antioxidant activity of BAS extracts was determined with potassium permanganate discoloration method in an aqueous sulfuric acid medium. Antimicrobial activity was investigated by germination of BAS extracts. BAS influence on lymphocyte proliferative activity was studied with help of cytogenetic analysis. In this paper, the assessment of antioxidant, antimicrobial and mitogenic activities of biologically active complexes extracted from marine invertebrate tissues is presented. BAS properties in the oil and alcohol-water phases are compared. For the first time BAS complexes from Black Sea invertebrates are extracted by the resource-light method of two-phase extraction in combination with ultrasonication. Conditions for obtaining BAS extracts with optimal characteristics are proposed.
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Solovjova, Natalia V. "Environmental risk assessments for contrasting Arctic shelf ecosystems." Hydrosphere Еcology (Экология гидросферы), no. 1(6) (2021): 69–84. http://dx.doi.org/10.33624/2587-9367-2021-1(6)-69-84.
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The article presents environmental risk assessments for two types of contrasting ecosystems of the Arctic shelf: highly productive and low-productive. Calculations were carried out using a probabilistic risk model with variations in the impact on the ecosystem from stressors, taking into account the risks from the technological processes of extraction and transportation of mineral resources of the shelf. Comparison of the results of risk modeling for highly productive and low-productive ecosystems showed that due to the low productivity of marine ecosystems, reliability requirements for technological processes ensuring the safety of resource development should not be reduced. The nontrivial conclusion obtained confirms the nonlinearity of the ecosystem response to impacts, which justifies the involvement not only of expert assessments, but also of all available methods, including modeling, to minimize the risks of Arctic resource development.
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Symons, Kate. "The tangled politics of conservation and resource extraction in Mozambique's green economy." Journal of Political Ecology 25, no. 1 (October 24, 2018): 488. http://dx.doi.org/10.2458/v25i1.22762.
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This article explores how Mozambique's green economy has been produced through the intersection of global ideas about green development, regional economic development dynamics, and local debates and political pressures around extraction and conservation. Mozambique's green economy aims to compress many of its current challenges into a seemingly attractive and compelling agenda. The green economy discourse has produced a new relationship between the conservation and extractives sector, characterized by 'green' financing and offsetting measures intended to handle (at least on paper) the contradictions between extractives-led growth and sustainable development. However, the green economy vision has also provided specific actors with ways to contest extraction. The article provides a lens onto the production of green economy policies and institutions in Mozambique, the way the policy combines neoliberal and non-neoliberal political ideas, and how green economy ideas are played out in the situated politics of debates over conservation and extraction. I consider how 'the' green economy is reworked through tracing a particular case – the recent debates over whether a large coal port should be built in the Ponta do Ouro Marine Reserve. This foregrounds the multiple and often ambiguous uses of green economy discourses to pursue different, and sometimes contradictory agendas. The article contributes new empirical information on the roll-out of green economies in a developing country context, while also seeking to expand current political ecology literature on neoliberalism and green economies more generally.Key words: Mozambique, green economy, neoliberal nature, extractives, conservation, assemblage
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Kungurova, Valentina. "Evaluating the effectiveness of fine gold extraction technologies on the example of titanomagnetite beach placers of the western coast of Kamchatka." Записки Горного института 252 (December 17, 2021): 840–53. http://dx.doi.org/10.31897/pmi.2021.6.6.
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The material on the gold content of coastal-marine deposits of the western coast of Kamchatka is analyzed and the resource potential is briefly characterized. A review of gold technological estimates obtained from the study of gold-bearing samples taken in promising areas of the coastal-marine strip, from the Bolshaya Vorovskaya River in the north to Cape Levashova in the south, is presented. Stock materials supplemented by our studies were used. Gold-bearing deposits with very fine (0.05-0.1 mm) and fine (0.1-1.0 mm) gold amounting to 94.6 % were tested, as well as samples with gold up to 2 mm and more in addition to fine gold The content of freely recoverable gold reached 91.9 %. In the case of significant gold reserves in placers, prospects for their commercial development open up. experiments on the enrichment of gold-bearing coastal-marine deposits of Western Kamchatka indicate the possibility of extraction of free gold and other valuable components from them. Gravity technologies and modern equipment developed by ОАО Irgiredmet and JSC ITOMAK are the most effective for their extraction. enrichment of gold-bearing formations with simultaneous extraction of several useful components from them, which is possible with the use of fluoride technology, can also become economically advantageous.
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Cadar, Emin, Cristina Luiza Erimia, Aneta Tomescu, Stelian Paris, and Rodica Sîrbu. "Marine Algae from Black Sea - Important Resources in the Pharmaceutical and Medical Research." European Journal of Interdisciplinary Studies 2, no. 1 (April 30, 2016): 27. http://dx.doi.org/10.26417/ejis.v2i1.p27-33.
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During the past years, it became obvious that the ecosystem presents a marine algae surpluses, which should be turned valuable in one way or another. The importance of the macrobenthic flora – algae and phanero-gammes – for the general productivity of the marine environment, especially in shallow waters, is becoming more and more obvious from the biological as well as from the economical point of view. The macrophytes also represent a particular life form. The benthic macroflora includes 33 species 4: 16 Chlorophyta, 10 Rhodophyta, 5 Phaeophyta, and 2 Phanerogama. The quantity of green algae (Chlorophyta) was higher in the Constanta – Eforie area, as red algae are predominant in the southern part of the littoral. Brown algae (Phaeophyta) were encountered in the Constanta city area (Punctaria) and in Vama-Veche (Cystoseira barbata). Yet, this fact indicates a slight amelioration of the marine ecosystem, after many years of eutrophication. The superior capitalisation of the marine biomass represents a highly important resource for the pharmaceutical industry, supplying raw material for the extraction of bioactive substances and various other substances, the purity of which is strongly connected to the state of the marine ecosystem.
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Cadar, Emin, Cristina Luiza Erimia, Aneta Tomescu, Stelian Paris, and Rodica Sîrbu. "Marine Algae from Black Sea - Important Resources in the Pharmaceutical and Medical Research." European Journal of Interdisciplinary Studies 4, no. 1 (April 30, 2016): 27. http://dx.doi.org/10.26417/ejis.v4i1.p27-33.
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During the past years, it became obvious that the ecosystem presents a marine algae surpluses, which should be turned valuable in one way or another. The importance of the macrobenthic flora – algae and phanero-gammes – for the general productivity of the marine environment, especially in shallow waters, is becoming more and more obvious from the biological as well as from the economical point of view. The macrophytes also represent a particular life form. The benthic macroflora includes 33 species 4: 16 Chlorophyta, 10 Rhodophyta, 5 Phaeophyta, and 2 Phanerogama. The quantity of green algae (Chlorophyta) was higher in the Constanta – Eforie area, as red algae are predominant in the southern part of the littoral. Brown algae (Phaeophyta) were encountered in the Constanta city area (Punctaria) and in Vama-Veche (Cystoseira barbata). Yet, this fact indicates a slight amelioration of the marine ecosystem, after many years of eutrophication. The superior capitalisation of the marine biomass represents a highly important resource for the pharmaceutical industry, supplying raw material for the extraction of bioactive substances and various other substances, the purity of which is strongly connected to the state of the marine ecosystem.
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Guillou, Nicolas, George Lavidas, and Georges Chapalain. "Wave Energy Resource Assessment for Exploitation—A Review." Journal of Marine Science and Engineering 8, no. 9 (September 11, 2020): 705. http://dx.doi.org/10.3390/jmse8090705.
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Over recent decades, the exploitation of wave energy resources has sparked a wide range of technologies dedicated to capturing the available power with maximum efficiency, reduced costs, and minimum environmental impacts. These different objectives are fundamental to guarantee the development of the marine wave energy sector, but require also refined assessments of available resource and expected generated power to optimize devices designs and locations. We reviewed here the most recent resource characterizations starting from (i) investigations based on available observations (in situ and satellite) and hindcast databases to (ii) refined numerical simulations specifically dedicated to wave power assessments. After an overall description of formulations and energy metrics adopted in resource characterization, we exhibited the benefits, limitations and potential of the different methods discussing results obtained in the most energetic locations around the world. Particular attention was dedicated to uncertainties in the assessment of the available and expected powers associated with wave–climate temporal variability, physical processes (such as wave–current interactions), model implementation and energy extraction. This up-to-date review provided original methods complementing the standard technical specifications liable to feed advanced wave energy resource assessment.
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Cadar, Emin, Emilia Mihaela Cadar, and Cristina-Luiza Erimia. "New Formulation with Marine Algae from Black Sea." European Journal of Medicine and Natural Sciences 2, no. 2 (October 15, 2019): 1. http://dx.doi.org/10.26417/559smu76z.
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Seaweed is a natural treasure that can be intensely evaluated for therapeutic purposes. During the past years, it became obvious that the ecosystem presents a marine algae excedent, which should be utilized in one way or another. Marine algae have been intensely studied. The superior exploitation of the marine biomass represents a highly important resource for the pharmaceutical industry, supplying raw material for the extraction of bioactive substances (vitamins, sterols, and aminoacids) and various other substances, the purity of which is strongly connected to the state of the marine ecosystem. In present work the extracts from marine algae are incorporated in type I non-denatured fibrillar collagen matrixes for obtain new pharmaceutical product. In order to obtain therapeutic effects at nanostructure level, it is important to know the rheological characteristics of the relevant mixtures of collagen gels and extracts from marine algae selected for use. In this survey we have studied mixtures made of non-denatured fibrillar collagen hydro-gels where different concentrations of marine algae have been incorporated.
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Yutani, Taku, Oak Yono, Tatsu Kuwatani, Daisuke Matsuoka, Junji Kaneko, Mitsuko Hidaka, Takafumi Kasaya, et al. "Super-Resolution and Feature Extraction for Ocean Bathymetric Maps Using Sparse Coding." Sensors 22, no. 9 (April 21, 2022): 3198. http://dx.doi.org/10.3390/s22093198.
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The comprehensive production of detailed bathymetric maps is important for disaster prevention, resource exploration, safe navigation, marine salvage, and monitoring of marine organisms. However, owing to observation difficulties, the amount of data on the world’s seabed topography is scarce. Therefore, it is essential to develop methods that effectively use the limited data. In this study, based on dictionary learning and sparse coding, we modified the super-resolution technique and applied it to seafloor topographical maps. Improving on the conventional method, before dictionary learning, we performed pre-processing to separate the teacher image into a low-frequency component that has a general structure and a high-frequency component that captures the detailed topographical features. We learn the topographical features by training the dictionary. As a result, the root-mean-square error (RMSE) was reduced by 30% compared with bicubic interpolation and accuracy was improved, especially in the rugged part of the terrain. The proposed method, which learns a dictionary to capture topographical features and reconstructs them using a dictionary, produces super-resolution with high interpretability.
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McDermott, Grant R., Kyle C. Meng, Gavin G. McDonald, and Christopher J. Costello. "The blue paradox: Preemptive overfishing in marine reserves." Proceedings of the National Academy of Sciences 116, no. 12 (August 27, 2018): 5319–25. http://dx.doi.org/10.1073/pnas.1802862115.
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Most large-scale conservation policies are anticipated or announced in advance. This risks the possibility of preemptive resource extraction before the conservation intervention goes into force. We use a high-resolution dataset of satellite-based fishing activity to show that anticipation of an impending no-take marine reserve undermines the policy by triggering an unintended race-to-fish. We study one of the world’s largest marine reserves, the Phoenix Islands Protected Area (PIPA), and find that fishers more than doubled their fishing effort once this area was earmarked for eventual protected status. The additional fishing effort resulted in an impoverished starting point for PIPA equivalent to 1.5 y of banned fishing. Extrapolating this behavior globally, we estimate that if other marine reserve announcements were to trigger similar preemptive fishing, this could temporarily increase the share of overextracted fisheries from 65% to 72%. Our findings have implications for general conservation efforts as well as the methods that scientists use to monitor and evaluate policy efficacy.
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Zarena, Arasali S. "Exploring the Potential Bioactive Properties of Marine Natural Products." Current Bioactive Compounds 15, no. 5 (January 3, 2019): 524–39. http://dx.doi.org/10.2174/1573407214666180727092555.
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Background: The marine world is highly diversified and is of great importance for its sustainable utilization as resources for human life. Although marine resource economy has its own share in the international market, there is only a handful of research occurring, the probability of not being completely explored. It has now become virtually possible to characterize the metabolites by bioanalytical techniques and molecular biology methodology. The marine biomes harbour largely diatoms, bacteria, fungi, actinomycetes, and cyanobacteria that are harnessed for their rich structurally diverse secondary metabolites. Recently, sponges and algae have gained commercial importance. Focuses are now shifting towards ascomycota, actinobacteria, cyanobacteria and other classes due to the advanced technology in extraction of the active components from these phyla and deeper exploration of the oceans. Method: A vast report on marine natural products have been regularly updated and published which clearly indicates the immense research undertaken in ocean flora and fauna. Herein we focus on providing information on the potential uses of marine natural products as bioactive agents in the last five years. The data were collected from research and review articles from peer-reviewed journals. Results: A total of 128 articles are citied in the present review covering broad spectrum of marine organism and their importance in the field of medical biology. Information on source organisms, collection sites, was assembled and a total of 120 biologically important compounds are described here. Conclusion: The present study provides information to bioprospecting efforts in the field of marine science. Herein, I have emphasized diverse biological activities isolated from marine microbes to invertebrate against many pathogenic microorganisms and cancer, thus making marine-derived natural products valuable commodities. Future prospects for the discovery of new marine products and process development could add to the economic importance.
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Biris Dorhoi, Elena Suzana, Maria Tofana, Simona Maria Chis, Carmen Elena Lupu, and Ticuta Negreanu Pirjol. "Wastewater Treatment Using Marine Algae Biomass as Pollutants Removal." Revista de Chimie 69, no. 5 (June 15, 2018): 1089–98. http://dx.doi.org/10.37358/rc.18.5.6267.
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The valorification of the marine biomass is an important resource for many industries like pharmaceutical, supplying raw material for the extraction of bioactive substances (vitamins, sterols and collagen), cosmetics, biofertilizers and wastewater treatment. In the last years a special attention has been given to the use of macroalgae. The aim of this study was to emphasize the capacity of two representative green algae species frequent presents on the Romanian shore, Ulva lactuca (L.) and Cladophora vagabunda (L.) Hoek, to remove two usual detergents from wastewater. The green algae washed, dried at room temperature, macerated to powder were introduced into different filter paper for comparison, then immersed in waste water treated with different concentrations of detergents. Tap water was used for the experiment. The results show that Ulva lactuca (L.) species is suitable than Cladophora vagabunda (L.) Hoek species, for wastewater treatment.
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Negreanu-Pirjol, T., R. Sirbu, and M. Mirea. "Antioxidant Activity Correlated with Chlorophyll Pigments and Magnesium Content of Some Green Seaweeds." European Journal of Medicine and Natural Sciences 3, no. 1 (May 15, 2020): 107. http://dx.doi.org/10.26417/393qel95l.
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The complex valorification of seaweed biomass represents a highly important resource for the pharmaceutical and dermo-cosmetic industry, supplying raw material for the extraction of bioactive substances such as, polysaccharides, vitamins, sterols, aminoacids, polyphenols and minerals. Marine algae represent an indefatigability resource of therapeutic active principles for diseases treatment of magnesium deficiency. The presence of chlorophyll pigments in the green algae confirms the magnesium existence, as central element in molecular structures. The main green algae, as Ulva lactuca and Enteromorpha intestinalis present on the Romanian Black Sea Coast, belong to Chlorophyta sp. In this paper we present a study of antioxidant activity correlated with magnesium content and chlorophyll pigments of the green algae Enteromorpha intestinalis and Ulva rigida (syn. Ulva lactuca) hydroalcoholic extracts. For chlorophyll pigments determination, the UV-Vis spectrometry was used. Magnesium content had been determined by absorption atomic spectrometry method, using HR-CS- AAS ContraA 700 apparatus, Analytik Jena and for total antioxidant capacity of green algae extracts, the photochemiluminescence method had been applied, using Photochem Analytik Jena apparatus. The comparative studies on two marine green algae extracts confirm the high magnesium content correlated with a high level of total antioxidant capacity for both species. The results obtained emphasize the possibility to enlarge the options to use these natural vegetal resources from Black Sea Coast, in different degenerative diseases therapy.
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Sakellariadou, Fani, Francisco J. Gonzalez, James R. Hein, Blanca Rincón-Tomás, Nikolaos Arvanitidis, and Thomas Kuhn. "Seabed mining and blue growth: exploring the potential of marine mineral deposits as a sustainable source of rare earth elements (MaREEs) (IUPAC Technical Report)." Pure and Applied Chemistry 94, no. 3 (February 4, 2022): 329–51. http://dx.doi.org/10.1515/pac-2021-0325.
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Abstract The expected growth of the global economy and the projected rise in world population call for a greatly increased supply of materials critical for implementing clean technologies, such as rare earth elements (REEs) and other rare metals. Because the demand for critical metals is increasing and land-based mineral deposits are being depleted, seafloor resources are seen as the next frontier for mineral exploration and extraction. Marine mineral deposits with a great resource potential for transition, rare, and critical metals include mainly deep-sea mineral deposits, such as polymetallic sulfides, polymetallic nodules, cobalt-rich crusts, phosphorites, and rare earth element-rich muds. Major areas with economic interest for seabed mineral exploration and mining are the following: nodules in the Penrhyn Basin-Cook Islands Exclusive Economic Zone (EEZ), the Clarion–Clipperton nodule Zone, Peru Basin nodules, and the Central Indian Ocean Basin; seafloor massive sulfide deposits in the exclusive economic zones of Papua New Guinea, Japan, and New Zealand as well as the Mid-Atlantic Ridge and the three Indian Ocean spreading ridges; cobalt-rich crusts in the Pacific Prime Crust Zone and the Canary Islands Seamounts and the Rio Grande Rise in the Atlantic Ocean; and the rare earth element-rich deep-sea muds around Minamitorishima Island in the equatorial North Pacific. In addition, zones for marine phosphorites exploration are located in Chatham Rise, offshore Baja California, and on the shelf off Namibia. Moreover, shallow-water resources, like placer deposits, represent another marine source for many critical minerals, metals, and gems. The main concerns of deep-sea mining are related to its environmental impacts. Ecological impacts of rare earth element mining on deep-sea ecosystems are still poorly evaluated. Furthermore, marine mining may cause conflicts with various stakeholders such as fisheries, communications cable owners, offshore wind farms, and tourism. The global ocean is an immense source of food, energy, raw materials, clean water, and ecosystem services and suffers seriously by multiple stressors from anthropogenic sources. The development of a blue economy strategy needs a better knowledge of the environmental impacts. By protecting vulnerable areas, applying new technologies for deep-sea mineral exploration and mining, marine spatial planning, and a regulatory framework for minerals extraction, we may achieve sustainable management and use of our oceans.
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Xing, Lujuan, Zixu Wang, Yuejing Hao, and Wangang Zhang. "Marine Products As a Promising Resource of Bioactive Peptides: Update of Extraction Strategies and Their Physiological Regulatory Effects." Journal of Agricultural and Food Chemistry 70, no. 10 (March 2, 2022): 3081–95. http://dx.doi.org/10.1021/acs.jafc.1c07868.
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Schultz, Jennifer K., Joseph M. O'Malley, Elizabeth E. Kehn, Jeffrey J. Polovina, Frank A. Parrish, and Randall K. Kosaki. "Tempering Expectations of Recovery for Previously Exploited Populations in a Fully Protected Marine Reserve." Journal of Marine Biology 2011 (2011): 1–14. http://dx.doi.org/10.1155/2011/749131.
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Centuries of resource extraction have impacted coral reef ecosystems worldwide. In response, area and fishery closures are often enacted to restore previously exploited populations and reestablish diminished ecosystem function. During the 19th and 20th centuries, monk seals, pearl oysters, and two lobster species were overharvested in the Northwestern Hawaiian Islands, now managed as the Papahānaumokuākea Marine National Monument, one of the largest conservation areas in the world. Despite years of protection, these taxa have failed to recover. Here, we review each case, discussing possible factors that limit population growth, including: Allee effects, interspecific interactions, and time lags. Additionally, large-scale climate changes may have altered the overall productivity of the system. We conclude that overfishing of coral reef fauna may have broad and lasting results; once lost, valuable resources and services do not quickly rebound to pre-exploitation levels. In such instances, management options may be limited to difficult choices: waiting hundreds of years for recovery, actively restoring populations, or accepting the new, often less desirable, alternate state.
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Sirbu, R., T. Negreanu-Pirjol, and M. Mirea. "Bioactive Compounds from Three Green Algae Species along Romanian Black Sea Coast with Therapeutically Properties." European Journal of Medicine and Natural Sciences 3, no. 1 (May 15, 2020): 87. http://dx.doi.org/10.26417/720mnv73y.
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During the past years, it became obvious that the ecosystem presents a marine algae excedent, which should be utilized in one way or another. In the marine world, algae have been intensely studied, but the Black Sea seaweeds are not sufficiently harnessed. To survive in such various diverse and extreme environments, macroalgae produce a variety of natural bioactive compounds and metabolites, such as polysaccharides, polyunsaturated fatty acids, and phlorotannins. In the Black Sea there are three species of green algae: Ulvae lactuca sp., Enteromorpha intestinalis and Cladophora sp. The superior exploitation of the marine biomass represents a highly important resource for the pharmaceutical industry, supplying raw material for the extraction of bioactive substances (vitamins, polysaccharides, sterols, phenols and amino-acids) and various other substances. The purity of this compounds is strongly connected to the state of the marine ecosystem. In the present paper are presented the main bioactive compounds existing in the chemical composition of the green algae in the Black Sea studied. The details of the therapeutic properties of the green algae generated by their chemical compositions.
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Sari, Denni Kartika, Ria Barleany Dhena, Indar Kustiningsih, Diansih, and Eka Aprillia. "Fucoxanthin Extraction by Ultrasonic-Assisted from Brown Seaweed (Padina Sp) Origin Pulau Merak Banten." Materials Science Forum 1057 (March 31, 2022): 107–15. http://dx.doi.org/10.4028/p-8rpv52.
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Seaweed is an underutilized resource with great potential in the food industry. Such as cosmetics, agrochemicals, biomass ingredients, bioenergy modifies. Indonesia is a country where two-thirds of its territory is marine. Fucoxanthin is a group of carotenoids found in abundance in marine macroalgae and has various health benefits. Traditional extraction (CE) of such potential biomolecules entails multiple steps that are both laborious and time-consuming. This study used ultrasound-assisted extraction (UAE) to extract high percentages of Fucoxanthin and phenolic compounds from the macroalga Padina sp. This research aims are to identification fucoxanthin compound in Padina Sp, determine the total phenolic content and composition of the pigment of Padina sp. This study also evaluates the effect of the extraction method concerning the time of exposure and solvent concentration on total phenolic content. Extract Padina Sp was further purified and characterized using FTIR. The pigment identification process is carried out by the thin layer chromatography method (TLC) and weigh mol using LC-MS. The results of the analyses present the highest content of TPC in Padina (755.633 mg GAE/mg) on 70 0C at 80% solvent concentration. Based on RSM methodology at 70 0C and 90 % solvent concentration. The active fraction of Fucoxanthin was identified at a Rf 0.96. The results of the RSM (Response Surface Methodology) showed the effect of concentration and temperature on the extraction of Fucoxanthin. The molecular weight of Fucoxanthin was found to be 659.43 m/z
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Flores Mateos, Lilia, and Michael Hartnett. "Incorporation of a Non-Constant Thrust Force Coefficient to Assess Tidal-Stream Energy." Energies 12, no. 21 (October 31, 2019): 4151. http://dx.doi.org/10.3390/en12214151.
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A novel method for modelling tidal-stream energy capture at the regional scale is used to evaluate the performance of two marine turbine arrays configured as a fence and a partial fence. These configurations were used to study bounded and unbounded flow scenarios, respectively. The method implemented uses turbine operating conditions (TOC) and the parametrisation of changes produced by power extraction within the turbine near-field to compute a non-constant thrust coefficient, and it is referred to as a momentum sink TOC. Additionally, the effects of using a shock-capture capability to evaluate the resource are studied by comparing the performance of a gradually varying flow (GVF) and a rapidly varying flow (RVF) solver. Tidal-stream energy assessment of bounded flow scenarios through a full fence configuration is better performed using a GVF solver, because the head drop is more accurately simulated; however, the solver underestimates velocity reductions due to power extraction. On the other hand, assessment of unbounded flow scenarios through a partial fence was better performed by the RVF solver. This scheme approximated the head drop and velocity reduction more accurately, thus suggesting that resource assessment with realistic turbine configurations requires the correct solution of the discontinuities produced in the tidal-stream by power extraction.
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Peñuela, Ana, Daniel Robledo, Nathalie Bourgougnon, Gilles Bedoux, Emanuel Hernández-Núñez, and Yolanda Freile-Pelegrín. "Environmentally Friendly Valorization of Solieria filiformis (Gigartinales, Rhodophyta) from IMTA Using a Biorefinery Concept." Marine Drugs 16, no. 12 (December 6, 2018): 487. http://dx.doi.org/10.3390/md16120487.
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Marine macroalgae (seaweed) are an excellent source of novel bioactive metabolites. The biorefinery concept applied to seaweed facilitates the extraction of many chemical constituents from the same biomass ensuring that the resource is used fully, generating few residues through a succession of extraction steps. In the present study, the biomass of the carragenophyte Solieria filiformis (Rhodophyta, Gigartinales) cultured in an integrated multi-trophic aquaculture (IMTA) system was evaluated to obtain valuable products by a biorefinery approach. Enzymatic-assisted extraction (EAE) and microwave-assisted extraction (MAE) were the eco-friendly technologies used to ensure an environmentally friendly valorization of the biomass. Three valuable products were successfully recovered: a water-soluble extract rich in proteins and sulfated polysaccharides suitable as a food supplement; a lipid fraction rich in polyunsaturated fatty acids (PUFAs) with potential to be used in the nutraceutical industry; and a pure ι-carrageenan with a powerful antiviral activity against Herpes simplex virus (EC50 = 6.3 µg mL−1) comparable to the commercial antiviral acyclovir (EC50 = 3.2–5.4 µg mL−1).
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Vitale, Giovanni Andrea, Daniela Coppola, Fortunato Palma Esposito, Carmine Buonocore, Janardhan Ausuri, Emiliana Tortorella, and Donatella de Pascale. "Antioxidant Molecules from Marine Fungi: Methodologies and Perspectives." Antioxidants 9, no. 12 (November 26, 2020): 1183. http://dx.doi.org/10.3390/antiox9121183.
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The marine environment represents a prosperous existing resource for bioprospecting, covering 70% of the planet earth, and hosting a huge biodiversity. Advances in the research are progressively uncovering the presence of unknown microorganisms, which have evolved unique metabolic and genetic pathways for the production of uncommon secondary metabolites. Fungi have a leading role in marine bioprospecting since they represent a prolific source of structurally diverse bioactive metabolites. Several bioactive compounds from marine fungi have already been characterized including antibiotics, anticancer, antioxidants and antivirals. Nowadays, the search for natural antioxidant molecules capable of replacing those synthetic currently used, is an aspect that is receiving significant attention. Antioxidants can inactivate reactive oxygen and nitrogen species, preventing the insurgence of several degenerative diseases including cancer, autoimmune disorders, cardiovascular and neurodegenerative diseases. Moreover, they also find applications in different fields, including food preservation, healthcare and cosmetics. This review focuses on the production of antioxidants from marine fungi. We begin by proposing a survey of the available tools suitable for the evaluation of antioxidants, followed by the description of various classes of marine fungi antioxidants together with their extraction strategies. In addition, a view of the future perspectives and trends of these natural products within the “blue economy” is also presented.
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Lynch, A. H., J. A. Curry, R. D. Brunner, and J. A. Maslanik. "Toward an Integrated Assessment of the Impacts of Extreme Wind Events on Barrow, Alaska." Bulletin of the American Meteorological Society 85, no. 2 (February 1, 2004): 209–22. http://dx.doi.org/10.1175/bams-85-2-209.
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Warming of the arctic climate is having a substantial impact on the Alaskan North Slope coastal region. The warming is associated with increasing amounts of open water in the arctic seas, rising sea level, and thawing permafrost. Coastal geography and increasing development along the coastline are contributing to increased vulnerability of infrastructure, utilities, and supplies of food and gasoline to storms, flooding, and coastal erosion. Secondary impacts of coastal flooding may include harm to animals and their land or sea habitats, if pollutants are released. Further, Inupiat subsistence harvesting of marine sources of food, offshore resource extraction, and marine transportation may be affected. This paper describes a project to understand, support, and enhance the local decision-making process on the North Slope of Alaska on socioeconomic issues that are influenced by warming, climate variability, and extreme weather events.
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Messina, Concetta Maria, Rosaria Arena, Simona Manuguerra, Yann Pericot, Eleonora Curcuraci, Fanny Kerninon, Giuseppe Renda, Claire Hellio, and Andrea Santulli. "Antioxidant Bioactivity of Extracts from Beach Cast Leaves of Posidonia oceanica (L.) Delile." Marine Drugs 19, no. 10 (September 30, 2021): 560. http://dx.doi.org/10.3390/md19100560.
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The marine environment is a generous source of biologically active compounds useful for human health. In 50 years, about 25,000 bioactive marine compounds have been identified, with an increase of 5% per year. Peculiar feature of algae and plants is the production of secondary metabolites, such as polyphenols, synthesized as a form of adaptation to environmental stress. Posidonia oceanica is a Mediterranean endemic and dominant seagrass and represents a biologically, ecologically and geologically important marine ecosystem. Within this study, methanolic and ethanolic extracts were generated from fresh and dried Posidonia oceanica leaves, with the aim to employ and valorize the beach cast leaves. The best yield and antioxidant activity (polyphenols content equal to 19.712 ± 0.496 mg GAE/g and DPPH IC50 of 0.090 µg/µL.) were recorded in 70% ethanol extracts (Gd-E4) obtained from leaves dried for two days at 60 °C and ground four times. HPLC analyses revealed the presence of polyphenols compounds (the most abundant of which was chicoric acid) with antioxidant and beneficial properties. Bioactive properties of the Gd-E4 extracts were evaluated in vitro using fibroblast cells line (HS-68), subjected to UV induced oxidative stress. Pre-treatment of cells with Gd-E4 extracts led to significant protection against oxidative stress and mortality associated with UV exposure, thus highlighting the beneficial properties of antioxidants compounds produced by these marine plants against photo damage, free radicals and associated negative cellular effects. Beach cast leaves selection, processing and extraction procedures, and the in vitro assay results suggested the potentiality of a sustainable approach for the biotechnological exploitation of this resource and could serve a model for other marine resources.
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Cadar, Emin, Ticuta Negreanu-Pirjol, and Bogdan-Stefan Negreanu-Pirjol. "Antioxidant and antibacterial potential of Ulva lactuca species from Romanian Black Sea Coast." European Journal of Medicine and Natural Sciences 5, no. 1 (May 26, 2022): 26. http://dx.doi.org/10.26417/371nrl91.
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Green algae biomass represents an important natural resource found in marine environments which could offer new applications in the pharmaceutical and cosmeceutical industries. The paper aim was to characterize some fluid extracts of Ulva lactuca L. green macroalgae species, in the Ulvaceae family, from Romanian Black Sea Coast, through physical, chemical and biological methods. For biomedical applications it is important to study how the difference between the marine environment specific conditions, from which they are harvested, can influence the chemical composition of macroalgae. Another important aspect which could affect the bioactive green macroalgae extracts composition, is the influence of applied extraction method. In this way, the less distructive cold maceration method in different solvent concentrations was chosen, according with literature data. The extracts have been studied in order to determine total polyphenols content, total antioxidant capacity by photochemiluminescence method and antibacterial activity. The results emphasized an antioxidant and antibacterial activity of the studied macroalgae extracts, which can be improved in mixture with other bioactive natural substances, in order to obtain new pharmaceutical preparations for topical applications. The valuable obtained results offer the possibility to propose this natural resource for next studies as biomaterial in tissue engineering, wound dressing and drug delivery systems. We consider that Ulva lactuca L. green macroalgae species of Romanian Black Sea Coast, could be an important source of marine bioactive compounds with various uses in the biomedical field.
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Shen, Xusheng, Tao Xie, and Tianzhen Wang. "A Fuzzy Adaptative Backstepping Control Strategy for Marine Current Turbine under Disturbances and Uncertainties." Energies 13, no. 24 (December 11, 2020): 6550. http://dx.doi.org/10.3390/en13246550.
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Marine current energy is attracting more and more attention in the world as a reliable and highly predictable energy resource. However, conventional proportional integral (PI) control will be sensitive to the numerous challenges that exist in a marine current turbine system (MCTs) such as marine current disturbance, torque disturbance and other uncertain parameters. This paper proposes a fuzzy adaptive backstepping control (F-A-BC) approach for a marine current turbine system. The proposed F-A-BC strategy consisted of two parts. First, an adaptive backstepping control approach with the compensation of disturbance and uncertainty was designed to improve anti-interference of the MCT so that the maximum power point tracking (MPPT) was realized. Then, a fuzzy logic control approach was combined to adjust parameters of an adaptive backstepping control approach in real time. The effectiveness of the proposed controller was verified by the simulation of a direct-drive marine current turbine system. The simulation results showed that the F-A-BC has better anti-interference ability and faster convergence compared to the adaptive backstepping control, sliding mode control and fuzzy PI control strategies under disturbances. The error percentage of rotor speed could be reduced by 3.5% under swell effect compared to the conventional controller. Moreover, the robustness of the F-A-BC method under uncertainties was tested and analyzed. The simulation results also indicated that the proposed approach could slightly improve the power extraction capability of the MCTs under variable marine current speed.
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Chzhu, O. P., D. E. Araviashvili, and A. L. Tumanova. "DEVELOPMENT OF THE BLACK SEA HYDROBIONT RESOURCE STUDY METHOD AS A NEW ECONOMICALLY FEASIBLE DIRECTION OF PHARMACOLOGY AIMING TOWARD SAVE HUMAN HEALTH AND ECOLOGY." IOP Conference Series: Earth and Environmental Science 941, no. 1 (November 1, 2021): 012023. http://dx.doi.org/10.1088/1755-1315/941/1/012023.
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Abstract The selection of the Black Sea aquatic area as a hydrobiont biologically active compound source allows resolving several environmental problems including development of an integrated hydrobiological resource management system for the Black Sea as a new sector of modern pharmacology. Aquatic organisms produce unique secondary metabolites. This paper presents the results of studies on the development of the biologically active substance extraction technology from non-commercial aquatic organisms as well as a preliminary assessment of the biochemical activity of the substrates obtained. Biologically active substances were extracted using the of two-phase extraction method in conjunction with ultrasound. For the substrates, the antioxidant activity was determined utilising the method that allow conducting screening of pharmaceutical raw materials and biologically active substances with high antioxidant activity. The protective activity evaluation was carried out during the study of the enzymatic alcoholic fermentation kinetics within a self-contained system. The evaluation of lymphocytes proliferative activities influenced by the obtained substrates was carried out using the cultivation method. The acquired data allows recommending the two-phase extraction method combined with ultrasonic voiceover as the effective one when processing analogical marine raw materials. The isolated substrates are characterised by a pronounced biochemical activity in relation to the living systems cells, which suggests a significant synergistic effect with derivatives of the microalgae Chlorella Vulgaris.
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Li, Jingjing, Jiajun Lu, Charles Asakiya, Kunlun Huang, Xiuzhi Zhou, Qingliang Liu, and Xiaoyun He. "Extraction and Identification of Three New Urechis unicinctus Visceral Peptides and Their Antioxidant Activity." Marine Drugs 20, no. 5 (April 27, 2022): 293. http://dx.doi.org/10.3390/md20050293.
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The viscera of Urechis unicinctus with polypeptides, fatty acids, and amino acids are usually discarded during processing to food. In order to improve the utilization value of the viscera of Urechis unicinctus and avoid resource waste, antioxidant polypeptides were isolated from the viscera of Urechis unicinctus. First, a protein hydrolysate of Urechis unicinctus (UUPH) was prepared by ultrasonic-assisted enzymatic hydrolysis, and the degree of hydrolysis was as high as 79.32%. Subsequently, three new antioxidant peptides (P1, P2, and P3) were purified from UUPH using ultrafiltration and chromatography, and their amino acid sequences were identified as VTSALVGPR, IGLGDEGLRR, TKIRNEISDLNER, respectively. Then, the antioxidant activity of the polypeptide was predicted by the structure–activity relationship and finally verified by experiments on eukaryotic cells. The P1 peptide exhibited the strongest antioxidant activity among these three antioxidant peptides. Furthermore, P1, P2, and P3 have no toxic effect on RAW264.7 cells at the concentration of 0.01~2 mg/mL and can protect RAW264.7 cells from H2O2-induced oxidative damage in a concentration-dependent manner. These results suggested that these three new antioxidant peptides were isolated from the viscera of Urechis unicinctus, especially the P1 peptide, which might serve as potential antioxidants applied in health-derived food or beverages. This study further developed a new use of the by-product of Urechis unicinctus, which improved the comprehensive utilization of marine biological resources.
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Makarynskyy, О., and D. Makarynska. "Integrated marine monitoring for drilling discharges under mesotidal forcing." Ukrainian hydrometeorological journal, no. 23 (June 8, 2019): 69–83. http://dx.doi.org/10.31481/uhmj.23.2019.07.
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There is a range of hydrocarbon exploration and extraction industrial project activities taking place on the North West Shelf of the Australian Continent. The shelf is a diverse and important marine ecosystem, with a number of globally significant shallow coral reefs and marine protected areas, which are vital for survival of threatened and protected species. Some of the mentioned exploration and extraction activities, such as offshore drilling, may be permitted within few kilometres away from sensitive habitats extant near a project resource extraction area. The habitats may in some cases be presented by submerged shoal ecosystems of high biodiversity and thus high environmental/ecological value, due to the presence of either or both benthic biota and fish assemblages. As part of an environmental assessment program for the industrial activities, some of the offshore exploration operators examine the effects of drilling discharges on the marine ambience. This study describes such an assessment. For the assessment, a novel integrated marine monitoring approach was conceptually designed; the program was then executed in the field using bottom-mounted equipment and a remotely operated underwater vehicle with sensors mounted on it. This study focuses on assessing the wind conditions in the project area, sea level and current velocities, in situ water temperature, salinity, turbidity and acoustic echo intensity, over several stages of the drilling operations while the drilling cuttings and muds were discharged into the water column. The collected during the austral autumn months of April and May winds showed prevailing east-southeaserlies, which is aligned well with the general understanding of wind climatology of the area. Importantly, stronger than usual winds may have a defining impact on current speeds and directions, with the current speeds enhanced by such winds. On these occasions the water transporting a discharge material may pushed towards the sensitive habitat present in the area. Normally though the hydrodynamics in the project area are dominated by semi-diurnal tides. Both vertical current velocity and water temperature distributions indicated the presence of three layers within the water column over the project site. The vertical distribution of water salinity was rather homogenous throughout the entire water column. The monitored by an optical instrument turbidity and acoustic echo intensity from an ADCP (acoustic Doppler current profiler) showed that tracing discharge plumes with a remotely operated underwater vehicle is a viable technique, which could be implemented at other locations. Such independent parameters though need a thorough cross-calibration and inter-validation for the results to be fully understood.
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Melo, Ana Brito, Eoin Sweeney, and Jose Luis Villate. "Global Review of Recent Ocean Energy Activities." Marine Technology Society Journal 47, no. 5 (September 1, 2013): 97–103. http://dx.doi.org/10.4031/mtsj.47.5.13.
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AbstractOcean energy is regarded as an important future source of energy generation in many countries for transition to a low-carbon future. While commercial interest in ocean energy is growing significantly at a global level, there are considerable investment costs and bottlenecks that will need to be overcome. Research and funds are spread over many different wave and marine current energy concepts under development, and there is still no technology convergence, in contrast to what happened in wind energy. Although an important marine energy resource, discussion of offshore wind energy is not included in this manuscript. This article focuses on the latest developments in ocean energy—in particular, open-sea testing facilities set up by several countries as a measure to encourage deployment and streamlining procedures—and gives an overview of projects going into the water this past year. In addition, the article highlights the importance of collaborative research and development on ocean energy projects and the unique role of the Ocean Energy Systems Implementing Agreement as an intergovernmental organization promoting the use of ocean energy (wave, marine currents, tidal, ocean thermal gradients and salinity gradients) for energy extraction.
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Satumantpan, Suvaluck, and Ratana Chuenpagdee. "Interactive Governance for the Sustainability of Marine and Coastal Resources in Thailand." Environment and Natural Resources Journal 20, no. 6 (August 25, 2022): 1–10. http://dx.doi.org/10.32526/ennrj/20/202200115.
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Coastal zones are biodiverse, with complex and dynamic interconnectivity between terrestrial and marine areas, and with multiple interactions between ecological and social systems. Despite on-going efforts to conserve and protect these ecosystems, destructive extraction and unsustainable resource utilization are persistent, posing challenges for governance. Issues and concerns in coastal zones are cross-sectoral and cross-boundary, often with overlapping jurisdictions. They are considered ‘wicked’ governance problems, requiring nuanced approaches to address, rather than technical quick fixes. Interactive governance is one such approach that examines relationships within and between the ecological and social systems, as well as with the governing system. Theoretically, the governability of coastal zones depends on the inherent quality of these systems and their interactions, and improving governability needs to take place in all three orders of governance. At the ‘first order’, a better understanding of the diversity, complexity and dynamics of coastal zones, and related scale issues is required. Improving governability at the ‘second order’ involves evaluating and adjusting the existing legal and institutional frameworks to improve the performance and the correspondence with the systems they aim to govern. Finally, discussion about coastal governance needs to be elevated to ‘meta-order’ where principles are set and values derived so that hard choices can be made, for instance, between conservation and utilization of coastal resources. Guided by the interactive governance framework, the paper presents an overview of coastal governance in Thailand, summarizing key features of the natural, social and governing systems associated with coastal zones, and discussing what can be done to improve coastal governability.
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Mititelu, Magdalena, Gabriela Stanciu, Doina Drăgănescu, Ana Corina Ioniță, Sorinel Marius Neacșu, Mihaela Dinu, Raluca-Ioana Stefan-van Staden, and Elena Moroșan. "Mussel Shells, a Valuable Calcium Resource for the Pharmaceutical Industry." Marine Drugs 20, no. 1 (December 24, 2021): 25. http://dx.doi.org/10.3390/md20010025.
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(1) Background: The mussel (Mytilus edulis, Mytilus galloprovincialis) is the most widespread lamellibranch mollusk, being fished on all coasts of the European seas. Mussels are also widely grown in Japan, China, and Spain, especially for food purposes. This paper shows an original technique for mussel shell processing for preparation of calcium salts, such as calcium levulinate. This process involves synthesis of calcium levulinate by treatment of Mytilus galloprovincialis shells with levulinic acid. The advantage of mussel shell utilization results in more straightforward qualitative composition. Thus, the weight of the mineral component lies with calcium carbonate, which can be used for extraction of pharmaceutical preparations. (2) Methods: Shell powder was first deproteinized by calcination, then the mineral part was treated with levulinic acid. The problem of shells generally resulting from the industrialization of marine molluscs creates enough shortcomings, if one only mentions storage and handling. One of the solutions proposed by us is the capitalization of calcium from shells in the pharmaceutical industry. (3) Results: The toxicity of calcium levulinate synthesized from the mussel shells was evaluated by the method known in the scientific literature as the Constantinescu phytobiological method (using wheat kernels, Triticum vulgare Mill). Acute toxicity of calcium levulinate was evaluated; the experiments showed the low toxicity of calcium levulinate. (4) Conclusion: The experimental results highlighted calcium as the predominant element in the composition of mussel shells, which strengthens the argument of capitalizing the shells as an important natural source of calcium.
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Teng, Xin-Nan, Shu-Chang Wang, Liaqat Zeb, Yue-Sheng Dong, and Zhi-Long Xiu. "Two-Step Enzymolysis of Antarctic Krill for Simultaneous Preparation of Value-Added Oil and Enzymolysate." Marine Drugs 21, no. 1 (January 11, 2023): 47. http://dx.doi.org/10.3390/md21010047.
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Antarctic krill is a crucial marine resource containing plenty of high-valued nutrients. However, krill oil as a single product has been developed by the current solvent extraction with high cost. From the perspective of comprehensive utilization of Antarctic krill, this study proposed a novel two-step enzymolysis-assisted extraction in attempt to produce value-added oil and enzymolysate simultaneously. After two-step chitinase/protease hydrolysis, the lipid yield increased from 2.09% to 4.18%, reaching 112% of Soxhlet extraction. The method greatly improved the yields of main components while reducing the impurity content without further refining. After optimization, the oil contained 246.05 mg/g of phospholipid, 80.96 mg/g of free eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), and 0.82 mg/g of astaxanthin. The by-product enzymolysate was abundant in water-soluble proteins (34.35 mg/g), oligopeptides (13.92 mg/g), amino acids (34.24 mg/g), and carbohydrates (5.79 mg/g), which was a good source of functional nutrients. In addition, both oil and enzymolysate showed high antioxidant capacity. This novel method could simultaneously provide oil and enzymolysate amounting for 58.61% of dried krill.
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Parianos, John, Ian Lipton, and Matthew Nimmo. "Aspects of Estimation and Reporting of Mineral Resources of Seabed Polymetallic Nodules: A Contemporaneous Case Study." Minerals 11, no. 2 (February 14, 2021): 200. http://dx.doi.org/10.3390/min11020200.
Full textAbstract:
Exploration of seabed polymetallic nodules identifies the Clarion Clipperton Zone and the Indian Ocean Nodule Field to be of economic interest. Mineral resource estimation is important to the owner of the resource (all of mankind; and managed by the International Seabed Authority; ISA) and to developers (commercial and government groups holding contracts with the ISA). The Committee for Mineral Reserves International Reporting Standards was developed for the land-based minerals industry and adapted in 2015 for ISA-managed nodules. Nodules can be sampled in a meaningful manner using mechanical devices, albeit with minor issues of bias. Grade and moisture content are measured using the established methodology for land-based minerals. Tonnage of resource is determined via the abundance of nodules in kilograms per square metre of seabed. This can be estimated from physical samples and, in some cases, from photographs. Contemporary resource reporting for nodules classify the level of confidence in the estimate, by considering deposit geology, sample geostatistics, etc. The reporting of estimates also addresses reasonable prospects for eventual economic extraction, including factors such as mining technology, the marine environment, metallurgical processing, and metals markets. Other requirements are qualified persons responsible for estimation and reporting, site inspection, and sample chain of custody.
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Saji, Sijin, Andrew Hebden, Parikshit Goswami, and Chenyu Du. "A Brief Review on the Development of Alginate Extraction Process and Its Sustainability." Sustainability 14, no. 9 (April 25, 2022): 5181. http://dx.doi.org/10.3390/su14095181.
Full textAbstract:
Alginate is an attractive marine resource-based biopolymer, which has been widely used in pharmaceutical, food and textile industries. This paper reviewed the latest development of the conventional and alternative processes for alginate extraction from brown seaweed. To improve extraction yield and product quality, various studies have been carried out to optimize the operation condition. Based on literature survey, the most commonly used protocol is soaking milled seaweed in 2% (w/v) formaldehyde, overnight, solid loading ratio of 1:10–20 (dry weight biomass to solution), then collecting the solid for acid pre-treatment with HCl 0.2–2% (w/v), 40–60 °C, 1:10–30 ratio for 2–4 h. Next, the solid residue from the acid pre-treatment is extracted using Na2CO3 at 2–4% (w/v), 40–60 °C, 2–3 h, 1:10–30 ratio. Then the liquid portion is precipitated by ethanol (95%+) with a ratio of 1:1 (v/v). Finally, the solid output is dried in oven at 50–60 °C. Novel extraction methods using ultrasound, microwave, enzymes and extrusion improved the extraction yield and alginate properties, but the financial benefits have not been fully justified yet. To improve the sustainable production of alginate, it is required to promote seaweed cultivation, reduce water footprint, decrease organic solvent usage and co-produce alginate with other value-added products.
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Saji, Sijin, Andrew Hebden, Parikshit Goswami, and Chenyu Du. "A Brief Review on the Development of Alginate Extraction Process and Its Sustainability." Sustainability 14, no. 9 (April 25, 2022): 5181. http://dx.doi.org/10.3390/su14095181.
Full textAbstract:
Alginate is an attractive marine resource-based biopolymer, which has been widely used in pharmaceutical, food and textile industries. This paper reviewed the latest development of the conventional and alternative processes for alginate extraction from brown seaweed. To improve extraction yield and product quality, various studies have been carried out to optimize the operation condition. Based on literature survey, the most commonly used protocol is soaking milled seaweed in 2% (w/v) formaldehyde, overnight, solid loading ratio of 1:10–20 (dry weight biomass to solution), then collecting the solid for acid pre-treatment with HCl 0.2–2% (w/v), 40–60 °C, 1:10–30 ratio for 2–4 h. Next, the solid residue from the acid pre-treatment is extracted using Na2CO3 at 2–4% (w/v), 40–60 °C, 2–3 h, 1:10–30 ratio. Then the liquid portion is precipitated by ethanol (95%+) with a ratio of 1:1 (v/v). Finally, the solid output is dried in oven at 50–60 °C. Novel extraction methods using ultrasound, microwave, enzymes and extrusion improved the extraction yield and alginate properties, but the financial benefits have not been fully justified yet. To improve the sustainable production of alginate, it is required to promote seaweed cultivation, reduce water footprint, decrease organic solvent usage and co-produce alginate with other value-added products.
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Sesama, Asih Sekar, Kuncoro Teguh Setiawan, and Atriyon Julzarika. "BATHYMETRIC EXTRACTION USING PLANETSCOPE IMAGERY (CASE STUDY: KEMUJAN ISLAND, CENTRAL JAVA)." International Journal of Remote Sensing and Earth Sciences (IJReSES) 17, no. 2 (March 24, 2021): 209. http://dx.doi.org/10.30536/j.ijreses.2020.v17.a3445.
Full textAbstract:
Bathymetry refers to the depth of the seabed relative to the lowest water level. Depth information is essential for various studies of marine resource activities, for managing port facilities and facilities, supporting dredging operations, and predicting the flow of sediment from rivers into the sea. Bathymetric mapping using remote sensing offers a more flexible, efficient,and cost-effective method and covers a largearea. This study aims to determine the ability of Planet Scope imagery to estimate and map bathymetry and to as certain its accuracy using the Stumpf algorithm on the in-situ depth data. PlanetScope level 3B satellite imagery and tide-corrected survey dataare employed; satellite images are useful in high-precision bathymetry extraction.The bathymetric extraction method used the Stumpf algorithm. The research location was Kemujan Island, Karimunjawa Islands, Central Java. The selection of this region wasbased on its water characteristics, which have a reasonably high variation in depth. Based on the results of the data processing, it was found that the PlanetScope image data were able to estimate depths of up to 20 m. In the bathymetric results, the R2 accuracy value was 0.6952, the average RMSE value was 2.85 m,and the overall accuracy rate was 71.68%.
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Iskandarova, Marfuga, and Elena Simakova. "Technologising the wave." Digital Scholar: Philosopher's Lab 3, no. 1 (2020): 101–22. http://dx.doi.org/10.5840/dspl2020319.
Full textAbstract:
Despite the recent shift from renewable energy to a low carbon policy, the UK policy discourse still recognises marine energy as part of the country’s future energy mix. Production of what we call an “assemblage” of technology and ocean waves triggers complex sets of initiatives that provide the basis for the economic viability and credibility of wave energy extraction. However, questions are rarely asked about how the natural phenomenon being part of this assemblage is construed as a resource to become a key element of promises and assessments of potential of renewable energy. This study sheds light on under-explored aspects of the credibility–economy and valuation practices formed around renewable energy that have not yet been problematised in social studies of energy. Arguing that ocean waves become an energy resource largely through resource assessment practices, we examine such practices in the context of the production of scientific and policy discourses around wave energy. Considering waves as an object of expertise, we examine how “wave data” constituted through measurements, statistical analysis, modelling and visualisation, contribute to the assessment and legitimisation of wave energy developments. We also evaluate the prospects for wave energy to be a “good” in future economic exchange.
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Thiessen, Bethany, Bram Noble, and Kevin Hanna. "Analysis of Impact Assessment Practice and Mitigation for Shipping Activity in the Eastern Canadian Arctic." ARCTIC 73, no. 2 (July 3, 2020): 221–39. http://dx.doi.org/10.14430/arctic70471.
Full textAbstract:
Marine traffic is increasing in the Canadian Arctic, largely because of changing ice conditions, a growing tourism industry, and natural resource extraction. Impact assessment (IA) is a primary instrument for managing the impacts of project development in the Arctic, but there has been limited analysis of the scope and application of IA for identifying and managing the impacts of shipping. This paper examines the impacts of shipping activity associated with mining projects in the eastern Canadian Arctic, including barge traffic and resupply vessels; the mitigation actions commonly prescribed in IA; and the key IA challenges facing decision-makers. Results show 71 impacts that may be considered common to IA applications for shipping, for which the mitigation strategies rely heavily on compliance-based measures and “best” practices to either minimize or avoid impacts, supported by follow-up programs that provide for adaptation of mitigation based on monitoring results. However, results also illustrate concerns over the ability of IA to effectively manage the cumulative effects of increasing Arctic marine traffic. Only a minority of projects involving marine transport trigger IA, even though other types of marine traffic, such as tourism, may generate similar types of impacts. The common impacts and mitigation solutions identified in this research and the lessons from monitoring can inform future IAs for shipping, improve permitting processes for shipping activities that do not require IA, and provide a foundation for a more regional or sector-wide approach to identifying and mitigating the cumulative effects of increasing vessel traffic.