Day 3 Wed, August 18, 2021最新文献

{"title":"Condition Monitoring of Next Generation Digitized Electric Subsea Actuators","authors":"Tobias Winter, Markus Glaser","doi":"10.4043/31123-ms","DOIUrl":"https://doi.org/10.4043/31123-ms","url":null,"abstract":"\u0000 A detailed knowledge about the health status of the installed assets is the key for continuous production without unexpected events and downtime, which causes production loss. A major aspect is the prediction of the occurrence of a failure before the affected function is demanded. This is one purpose of the Condition Monitoring (CM), Prognostics and Health Management (PHM) and the application of a Digital Twin. The paper presents the result of an ability analysis for a subsea actuator towards its possibilities to increase the availability through a novel and extensive grade of information. The paper presents the resulting architecture and solution to achieve an actuator design, which is capable to provide a high safety, high reliability and a predictive health management which is prepared for a digital twin application. For this purpose, an applied Condition Monitoring concept is described and shown based on the case study.\u0000 The analysis and resulting solution is based on a detailed research towards the state of the art. Different available subsea actuators are analyzed towards the communication interfaces and the ability to allow CM. Therefore, the required status and information of the actuator are shown (e.g. Torque, position, temperature, acceleration, water concentration in oil, humidity, pressure, inclinometer). The required environment information about the actuator are evaluated with the help of a failure mode analysis. The different sensor principles provide the necessary information. The paper evaluates the significance of the sensor information towards the CM concept. The data can be provided on different communication interfaces and protocols. These are analyzed towards the satisfaction of the CM requirements.\u0000 The result of the analysis is a detailed architecture of a CM capable subsea electric actuator including the CM concept. The possible interfaces are shown and the provided sensor data by the actuator. The sensors provide the input for the CM model and the remote accessibility and controllability of the actuator.\u0000 The result is the novel design of a subsea actuator, which fits perfect in a digitalized subsea environment to increase the availability and controllability including a CM concept.","PeriodicalId":11184,"journal":{"name":"Day 3 Wed, August 18, 2021","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72864452","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}

{"title":"Using Metocean Forecast Verification Information to Effectively Enhance Operational Decision-Making","authors":"E. Steele, Hannah Brown, C. Bunney, Philip G. Gill, K. Mylne, A. Saulter, J. Standen, Liam Blair, Stewart Cruickshank, M. Gulbrandsen","doi":"10.4043/31253-ms","DOIUrl":"https://doi.org/10.4043/31253-ms","url":null,"abstract":"\u0000 Metocean forecast verification statistics (or ‘skill scores’), for variables such as significant wave height, are typically computed as a means of assessing the (past) weather model performance over the particular area of interest. For developers, this information is important for the measurement of model improvement, while for consumers this is commonly applied for the comparison/evaluation of potential service providers. However, an opportunity missed by many is also its considerable benefit to users in enhancing operational decision-making on a real-time (future) basis, when combined with an awareness of the context of the specific decision being made. Here, we present two categorical verification techniques and demonstrate their application in simplifying the interpretation of ensemble (probabilistic) wave forecasts out to 15 days ahead, as pioneered – in operation – in Summer 2020 to support the recent weather sensitive installation of the first phase of a 36 km subsea pipeline in the Fenja field in the North Sea. Categorical verification information (based on whether forecast and observations exceed the user-defined operational weather limits) was constructed from 1460 archive wave forecasts, issued for the two-year period 2017 to 2018, and used to characterise the past performance of the European Centre for Medium-Range Weather Forecasts (ECMWF) ensemble prediction system (EPS) in the form of Receiver Operating Characteristic (ROC) and Relative Economic Value (REV) analysis. These data were then combined with a bespoke parameterization of the impact of adverse weather on the planned operation, allowing the relevant go/no-go ensemble probability threshold (i.e. the number of individual/constituent forecast members that must predict favourable/unfavourable conditions) for the interpretation of future forecasts to be determined. Following the computation of the probability thresholds for the Fenja location, trials on an unseen nine-month period of data from the site (Spring to Autumn 2019) confirm these approaches facilitate a simple technique for processing/interpreting the ensemble forecast, able to be readily tailored to the particular decision being made. The use of these methods achieves a considerably greater value (benefit) than equivalent deterministic (single) forecasts or traditional climate-based options at all lead times up to 15 days ahead, promising a more robust basis for effective planning than typically considered by the offshore industry. This is particularly important for tasks requiring early identification of long weather windows (e.g. for the Fenja tie-ins), but similarly relevant for maximising the exploitation of any ensemble forecast, providing a practical approach for how such data are handled and used to promote safe, efficient and successful operations.","PeriodicalId":11184,"journal":{"name":"Day 3 Wed, August 18, 2021","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79766233","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}

{"title":"An Interactive Numerical-Experimental Approach for Predicting the Vortex Induced Motion of Floating Production Systems","authors":"A. Mansour, Cheng Peng, Stéphane Le-Guennec, Hisham Moideen","doi":"10.4043/30921-ms","DOIUrl":"https://doi.org/10.4043/30921-ms","url":null,"abstract":"\u0000 The Vortex Induced Motion (VIM) phenomenon is one of the well-known and important behavior experienced by all Floating Production Systems (FPSs) in operation under the effect of uniform current. In this phenomenon, under the effect of the formed vortices around the FPS hull, the platform oscillates primarily in a direction perpendicular to the flow resulting in a significant fatigue damage to the risers and the station keeping mooring system. Scale towing tank test has been the standard industry tool for predicting the VIM response, but it has its own limitations and has showed to significantly overpredict the VIM response when compared to the field measurements. In this paper, an interactive numerical-experimental approach has been developed to more accurately predict the VIM response and avoid the shortcomings of the model tests to bridge the gap between the model test predictions and the field measurements. Numerical and experimental data are presented to demonstrate the application and advantages of the proposed approach","PeriodicalId":11184,"journal":{"name":"Day 3 Wed, August 18, 2021","volume":"126 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87657836","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}

{"title":"From Data to Assessment Models, Demonstrated through a Digital Twin of Marine Risers","authors":"E. Kharazmi, Zhicheng Wang, Dixia Fan, S. Rudy, T. Sapsis, M. Triantafyllou, G. Karniadakis","doi":"10.4043/30985-ms","DOIUrl":"https://doi.org/10.4043/30985-ms","url":null,"abstract":"\u0000 Assessing the fatigue damage in marine risers due to vortex-induced vibrations (VIV) serves as a comprehensive example of using machine learning methods to derive assessment models of complex systems. A complete characterization of response of such complex systems is usually unavailable despite massive experimental data and computation results. These algorithms can use multi-fidelity data sets from multiple sources, including real-time sensor data from the field, systematic experimental data, and simulation data. Here we develop a three-pronged approach to demonstrate how tools in machine learning are employed to develop data-driven models that can be used for accurate and efficient fatigue damage predictions for marine risers subject to VIV.","PeriodicalId":11184,"journal":{"name":"Day 3 Wed, August 18, 2021","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85405968","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}

{"title":"Applications of Lithium-Ion Batteries in Offshore Oil & Gas: The Journey to Building a Low-Emissions Drilling Rig","authors":"S. Settemsdal","doi":"10.4043/30923-ms","DOIUrl":"https://doi.org/10.4043/30923-ms","url":null,"abstract":"\u0000 This paper discusses applications for lithium-ion batteries in an offshore oil and gas environment and describes how battery packs/energy storage can be applied in hybrid, diesel-electric power plants to create low-emissions drilling rigs.\u0000 The incorporation of energy storage, particularly in direct current (DC) based power plants, can provide a wide range of benefits for operators, allowing them to reduce the runtime of onboard diesel engines and optimize combustion efficiency, thereby maximizing fuel utilization and reducing emissions. Batteries can also be used to create new redundancy schemes, as well as for peak shaving and blackout prevention.\u0000 The West Mira semisubmersible installation in the North Sea was the world's first modern drilling rig to operate a low-emission hybrid (diesel-electric) power plant with lithium-ion batteries connected to the main power grid. The paper describes the energy storage solution that was implemented on the facility and discusses how considerations for safety and reliability were addressed.","PeriodicalId":11184,"journal":{"name":"Day 3 Wed, August 18, 2021","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83881033","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}

{"title":"Propagation and control of Anredera cordifolia (Ten.) Stennis (madeira vine)","authors":"João Paulo R. San Gregorio, Nicolas Moreira Pioto, V. A. Forti, Josiane Rodrigues, P. V. Silva, P. A. Monquero","doi":"10.21475/ajcs.21.15.08.p3320","DOIUrl":"https://doi.org/10.21475/ajcs.21.15.08.p3320","url":null,"abstract":"Anredera cordifolia (Ten.) Stennis, commonly known as the madeira vine, is a succulent vine that produces vegetative structures on stems and invades agricultural areas in Brazil. This plant has become a possible invader in Brazilian agriculture with records of losses in coffee crops. The objective of this study was to study the influence of dimensional variation and different depths of planting aerial bulbils on the growth and development of A. cordifolia plants, as well as to study the influence of the effect of herbicides on postemergence control. All experiments were carried out in a greenhouse. In the propagation experiment, a completely randomized design with six replications was used. Aerial tubers of four weight categories (C) (C1, 0–0.59 g; C2, 0.60–1.49 g; C3, 1.50–2.99 g; C4, 3.0–12.0 g) were evaluated regarding the percentage of viable tubers, number of stems per tuber (ST), average stem length, shoot dry matter, and emergence speed index (ESI). ST and ESI were evaluated at seven soil depths (0, 3, 6, 10, 15, 20, and 30 cm). For experiments with herbicides, a completely randomized design with four replications was used. Six herbicides (chlorimuron-ethyl, flumioxazin, glyphosate, metsulfuron-methyl, saflufenacil, and glyphosate + saflufenacil) at the recommended doses and a control (without herbicide) were used to evaluate the postemergence control. Plants from larger tubers had a higher sprouting rate and faster growth and establishment, and tubers grown on the soil surface produced plants with faster development. Glyphosate + saflufenacil was more effective in controlling this plant species, with 79.50% control. All other herbicide treatments caused only chlorosis and poor control.","PeriodicalId":11184,"journal":{"name":"Day 3 Wed, August 18, 2021","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80951164","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}

{"title":"Agricultural and livestock production in the Amazon: a reflection on the necessity\u0000of adoption of integrated production strategies in the western region of the state of Pará","authors":"L. Martorano, J. C. D. C. Moraes, L. K. X. Silva, P. C. Fernandes, J. M. D. A. Júnior, L. S. Lisboa, K. Neves, Aline Pacheco, T. Beldini, L. E. D. O. Aparecido, W. C. Silva, V. P. Godinho","doi":"10.21475/ajcs.21.15.08.p2908","DOIUrl":"https://doi.org/10.21475/ajcs.21.15.08.p2908","url":null,"abstract":"The Brazilian Amazon has a large bovine herd and is an important exporter of meat from cattle and is also one of the most competitive regions for exportation of animal protein. Conventional extensive cattle ranching management has been a strategy promoted by public policies and has contributed to the processes of occupation of the region through modification of public lands with native forests. The objective of this study was to analyze the fundamental elements that have sustained conventional extensive cattle ranching in the Amazon and to demonstrate new strategies to change this paradigm, with a focus on western Pará. Data from the Brazilian Institute of Geography and Statistics (IBGE) on cattle ranching production between 1990 and 2019 were analyzed and separated into two periods, 1990-2000, and 2001-2019. Meteorological data from western Pará were analyzed to describe the agrometeorological conditions (1989 -2012) with respect to the hydrological regime and its controls on the soil-plant-atmosphere system. Results show that the largest greenhouse gas emissions (GGE) from ruminants occurs during the dry season due to pasture forage grasses that are highly lignified. In contrast, lower emissions occur from diets rich in proteins and lipids, with subsequent gains in productivity, thus indicating the benefits of pastures with well-managed grasses. It is believed that cattle ranchers will adopt integrated systems such as integration of crop-livestock-forest (ICLF) when they are able to understand that climate conditions can be allied with sustainability indicators of the production chain. This paradigm shift in production systems applies not only to environmental and economic aspects, but especially to social ones such as opportunities to hire qualified workers coming from regional agrarian science schools","PeriodicalId":11184,"journal":{"name":"Day 3 Wed, August 18, 2021","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73321891","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}

{"title":"Taxonomic significances of seed morphology in some tribes of subfamily Malvoideae (Malvaceae) in Saudi Arabia","authors":"K. A. Khalik, Suad Al- Ruzayza, A. Farid","doi":"10.21475/ajcs.21.15.08.p3360","DOIUrl":"https://doi.org/10.21475/ajcs.21.15.08.p3360","url":null,"abstract":"In this study, we evaluated the taxonomic significance and seed macro and micromorphological characteristics of 28 species belong to eight genera of subfamily Malvoideae (Malvaceae) from Saudi Arabia. The genotypes were studied using light and scanning electron microscope (SEM). Macro- and micromorphological characters of the seeds are presented, including shape, color, size, hairs, surface pattern, epidermal cell shape, anticlinal boundaries, and periclinal cell wall. The taxonomic and phylogenetic implications of seed coat micromorphology were compared with those of the available gross morphological and molecular data (ISSR and SCOT). Seed character analysis offered useful data for evaluating the taxonomy of Malvoideae on both intrageneric and tribal levels. Monophyly of the genera Abutilon, Malva and Pavonia was supported. Moreover, these analyses supported previous phylogenetic data, indicating that distinct lines are present within the genus Hibiscus and Sida, indicating that these genera are not monophyletic. A key is provided for identifying the investigated taxa based on seed characters","PeriodicalId":11184,"journal":{"name":"Day 3 Wed, August 18, 2021","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86136513","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}

{"title":"Resistance levels of Arabica coffee cultivars to bacterial-halo-blight under field conditions and planting spacings within the rows","authors":"Fernando Cesar Carducci, W. G. D. Santos, C. T. M. Pereira, L. M. R. Rodrigues, L. Beriam, L. Shigueoka, Valdir Mariucci Junior, Kawana Silva Bortolato, G. H. Sera","doi":"10.21475/ajcs.21.15.08.p3229","DOIUrl":"https://doi.org/10.21475/ajcs.21.15.08.p3229","url":null,"abstract":"Bacterial-halo-blight (BHB) is an important coffee disease caused by the Pseudomonas syringae pv. garcae. To date, there are few studies reporting resistance to BHB in adult plants of Arabica coffee cultivars under field conditions. The aim of this study was to assess the levels of resistance to BHB in Arabica coffee cultivars under field conditions and different planting spacings within the rows (SWR). The field trial was assessed for BHB severity in natural infection condition by using a grade scale, ranging from 1 to 5 in Londrina (Paraná state, Brazil) in December 2016 (36 months after planting). The experiment was planted at the 2.50m spacing inter-row, using randomized blocks design in a 4 x 15 factorial scheme with three replications and five plants per plot. The factors consisted of four SWR (0.40m, 0.50m, 0.60m and 0.70m) and 15 Arabica coffee cultivars. The resistance levels were based on the mean BHB severity grades, where the cultivars were classified as highly resistant (HR), resistant (R), moderately resistant (MR), slightly resistant (SR) and susceptible (S). Adult plants of IPR 102 and IPR 106 were HR and MR to BHB, respectively, under natural field conditions. IAPAR 59, IPR 103, IPR 104, IPR 107 and IPR 108 showed a lower level of resistance than the cultivars IPR 102 and IPR 106. Some HdT-derived cultivars such as IPR 97, IPR 98, IPR 99 and Tupi IAC 1669-33, besides cultivars IPR 100, IPR 101 and IPR 105, derived from IAC 1110-8 were susceptible. In the two SWR more densely, the BHB severity was higher, and some cultivars behaved as more susceptible in these spacings.","PeriodicalId":11184,"journal":{"name":"Day 3 Wed, August 18, 2021","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88426403","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}

{"title":"Silicon as mitigator of salt stress in mango tree seedlings","authors":"M. Véras, Lunara De Sousa Alves, T. I. Silva, Iana Nogueira da Silva, A. R. D. Costa, E. N. Melo, Hellen Patricia Lemos Cordovil, Adriana Pricilla Jales Dantas, Nelto Almeida de Sousa, T. J. Dias","doi":"10.21475/ajcs.21.15.08.p3190","DOIUrl":"https://doi.org/10.21475/ajcs.21.15.08.p3190","url":null,"abstract":"The use of saline water dramatically reduces the growth and development of plants. Thus, salt stress mitigation can be important to allow the use of this water in the agriculture. This study aimed to evaluate the effect of silicon as attenuators of effects caused by salt stress on seedlings of “Espada” mango tree variety. An experiment was conducted under completely randomized experimental design in a factorial scheme (5 x 2). The factors studied consisted of silicon concentrations (0, 50, 100, 150 and 200 mg L-1) and irrigation with low water (0.8 dS m-1) and high (6 dS m-1) electrical conductivity and the growth of mango tree seedlings was assessed 70 days after sowing (DAS) by the height, number of leaves, stem diameter, dry matter of root, aerial part and total, dry matter content, Dickson Quality Index and Index of tolerance to salinity. The application of silicon via leaf mitigates the deleterious effects of salt stress in mango seedlings. Silicon 200 mg L-1 promotes higher growth, dry matter accumulation and 100 mg L-1 concentration provides higher salt tolerance in mango seedlings. Electrical conductivity in the irrigation water at 6 dS m-1 reduce the growth and quality the of mango tree seedlings","PeriodicalId":11184,"journal":{"name":"Day 3 Wed, August 18, 2021","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74017072","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}