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Literatura científica selecionada sobre o tema "OPvrc"

Autor: Grafiati

Publicado: 25 de julho de 2024

Última modificação: 30 de julho de 2024

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Artigos de revistas sobre o assunto "OPvrc"

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Syed Mohsin, Sharifah Maszura, Sayid Javid Azimi e Abdoullah Namdar. "Behaviour of Oil Palm Shell Reinforced Concrete Beams Added with Kenaf Fibres". Applied Mechanics and Materials 567 (junho de 2014): 351–55. http://dx.doi.org/10.4028/www.scientific.net/amm.567.351.

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The present article reports the findings of a study into the behaviour of oil palm shell reinforced concrete (OPSRC) beams with the addition of kenaf fibres. This work aims at examining the potential of kenaf fibres to improve the strength and ductility of the OPSRC beams as well as observing its potential in serving as part of shear reinforcement in the beams. Two different arrangements of the shear links in OPSRC beams with a selection of kenaf fibres content (10kg/m3 and 20kg/m3, respectively) were tested under monotonic loading. The results show that the addition of kenaf fibres enhances the load carrying capacity, ductility apart from altering the failure mode of the beams from brittle shear mode to flexural ductile mode. Furthermore, the study shows that kenaf fibres are compatible with OPSRC with desirable results.

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Edwards, David T. "STATUS OF IMPLEMENTATION OF THE OPRC CONVENTION AND RESOLUTION ADOPTED BY THE OPPR CONFERENCE1". International Oil Spill Conference Proceedings 1993, n.º 1 (1 de março de 1993): 649–53. http://dx.doi.org/10.7901/2169-3358-1993-1-649.

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ABSTRACT Participants in the 1991 Oil Spill Conference were informed of the outcome of the IMO Conference on International Cooperation on Oil Pollution Preparedness and Response, in particular the adoption of the International Convention on Oil Pollution Preparedness, Response and Co-operation, 1990 (OPRC). Although 27 States signed it, the OPRC stipulates that it will enter into force or become binding one year after 15 States have accepted or ratified it. Although the OPRC, therefore, is not yet in force, IMO Member States, the Secretary-General of IMO, Mr. William O'Neil, and IMO's Marine Environment Protection Committee (MEPC) have taken concrete actions to facilitate early implementation. In November 1991 the Secretary-General established a coordination center in the Marine Environment Division of IMO to carry out functions assigned to IMO under the OPRC (information services, education and training, technical services, and technical assistance). In March 1992 the MEPC established an OPRC Working Group, in which government and industry experts and representatives of environmental organizations participate, to deal with matters related to implementation of the OPRC. Among the important topics which will be included in the program of the OPRC Working Group through 1992–1993 are links between MARPOL Regulation 26 and OPRC articles 3 and 6 and development of guidelines for the preparation of oil pollution emergency plans for offshore units and seaports; update of IMO's Manual on Oil Pollution, Section II—Contingency Planning; development of guidelines or recommendations on facilitating the movement of response equipment and personnel and the use of response resources during marine pollution incidents; development of research and development clearinghouse functions; development of model training courses and an OPRC training plan; and consideration of ways to expand the scope of the OPRC to include hazardous and noxious substances.

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Culp, Stephen Hembree, Yunchuan Delores Mo, Mairo Diolombi e Helen P. Cathro. "Classification of oncocytic papillary renal cell carcinoma." Journal of Clinical Oncology 31, n.º 6_suppl (20 de fevereiro de 2013): 467. http://dx.doi.org/10.1200/jco.2013.31.6_suppl.467.

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467 Background: Over the past decade, genitourinary pathologists have increasingly recognized an oncocytic variant of papillary renal cell carcinoma (PRC) that can complicate classification as Type 1 or Type 2 PRC. The International Society of Urological Pathology recently proposed reclassifying oncocytic papillary renal cell carcinoma (OPRC) as a separate subtype. We set out to test the validity of separating oncocytic tumors from other PRC. Methods: 70 consecutive cases of PRC with sufficient tissue for analysis were reviewed from patients undergoing surgery at The University of Virginia (1992 to 2007). All cases were classified by type, including those with oncocytic features. Histologic, clinical, and outcomes data were analyzed based on type and the presence of oncocytic features. Results: A total of 15 (21.4%) tumors displayed oncocytic differentiation, the majority of which were Type 2 tumors (11 or 73.3%) (p < 0.001). The male to female ratio of OPRC cases was nearly 1:1 in contrast to a significant male bias historically seen in PRC. The presence of oncocytic features was significantly associated with higher Fuhrman grade (p < 0.001) and no OPRC tumors were multifocal as opposed to 13 (23.6%) of non-OPRC tumors. At a median follow-up of 79.9 months for the entire cohort, 5-yr disease specific survival (DSS) for OPRC patients was 79.0% which was intermediate between patients with Type 1 (93.4%) and Type 2 (44.4%) tumors. By Cox proportional hazards regression analysis, DSS of OPRC patients was significantly better than Type 2 patients (HR 0.12; 95% CI 0.03, 0.52, p = 0.004), but tended to be worse than Type 1 patients (HR 2.58; 95% CI 0.78, 8.50, p = 0.12). Conclusions: We report the largest cohort of OPRC patients to date. Patients with OPRC demonstrate a survival rate intermediate between that of patients with non-oncocytic Type 1 and Type 2 PRC. Though the majority of OPRC tumors were classified as Type 2 PRC, oncocytic features complicate histomorphologic typing. Therefore, classification of OPRC separately would clarify typing of PRC and improve the validity of Fuhrman nuclear grading for PRC. Our results support separation of OPRC from Type 1 and Type 2 PRC, based on both histomorphologic typing and patient survival.

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Ohne, Kiyoshi. "IMO-OPRC INFORMATION SYSTEM1". International Oil Spill Conference Proceedings 1995, n.º 1 (1 de fevereiro de 1995): 779–82. http://dx.doi.org/10.7901/2169-3358-1995-1-779.

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ABSTRACT To facilitate response activities of the International Maritime Organization (IMO) and its member states with respect to oil pollution in the Persian Gulf, the IMO Oil Pollution Co-ordination Centre (OPCC) was established in February 1991. During such operations and other relevant activities, it was recognized that databases on national contact points and the type of assistance member states could offer would be valuable and should be developed. In addition, the OPCC has developed other databases and utilized them when the OPCC responds to oil pollution emergencies and provides general advice concerning oil pollution preparedness and response to member states. These activities are related to some of the requirements assigned to IMO under the International Convention on Oil Pollution Preparedness, Response and Co-operation, 1990 (the OPRC Convention). The convention will enter into force on May 13, 1995.

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Makovska, Yulia. "Model of determining price of a long-term contract for ongoing maintenance and maintenance of highways". Avtoshliakhovyk Ukrayiny, n.º 1 (253) ’ 2018 (26 de março de 2018): 30–32. http://dx.doi.org/10.33868/0365-8392-2018-1-253-30-32.

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The paper addresses the problem of OPRC. The current state of tools justification prices OPRC: model, based on the concept of discrete state of the road surface, and the model based on the economic theory of agency. This mathematical formulation proposed by the authors simulation model justification prices OPRC based on seasonally expert estimates of probability of defects road surface and the possibility of using a certain probability of different methods of elimination of defects, different resource requirements. Forecast assumptions about the subject of study – apply a simulation model with simulated random events and values of Monte Carlo and optimization based on evolutionary method. Keywords: OPRC, long-term contracts, price contract, simulation model

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Gallego Pareja, Luis A., Jesús M. López-Lezama e Oscar Gómez Carmona. "Optimal Feeder Reconfiguration and Placement of Voltage Regulators in Electrical Distribution Networks Using a Linear Mathematical Model". Sustainability 15, n.º 1 (3 de janeiro de 2023): 854. http://dx.doi.org/10.3390/su15010854.

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Power distribution systems face continuous challenges from increased demand and lengthening of feeders, resulting in power loss augmentation and unacceptable voltage drops. Thus, to reduce technical losses and improve the voltage profile, common techniques such as reactive compensation, network reconfiguration, and placing of voltage regulators are employed. Distribution network reconfiguration (DNR) consists of modifying the system topology with the aim of minimizing power losses, enhancing voltage profile, and improving network reliability. Optimal placement of voltage regulators (OPVRs) improves the voltage profile and helps to reduce power losses. DNR and OPVRs are challenging optimization problems involving both integer and continuous decision variables. In this paper, a mixed-integer linear programming (MILP) model is presented to simultaneously solve the problems of DNR and OPVRs in radial distribution networks. The combined optimal DNR and OPVRs aim at both the minimization of power losses and the improvement of the voltage profile. This approach has not been reported in the specialized literature. The proposed MILP model may be solved through commercially available software, obtaining global optimal solutions with lower computational effort than metaheuristic techniques applied for the same purpose. Several tests were conducted on three benchmark distribution test systems to demonstrate the efficacy and applicability of the proposed approach.

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Edwards, David T. "IMO'S STRATEGY FOR THE IMPLEMENTATION OF THE OPRC CONVENTION1". International Oil Spill Conference Proceedings 1995, n.º 1 (1 de fevereiro de 1995): 787–89. http://dx.doi.org/10.7901/2169-3358-1995-1-787.

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ABSTRACT The International Convention on Oil Pollution Preparedness, Response and Cooperation (OPRC) will enter into force May 13, 1995, less than five years after its adoption by a global diplomatic conference convened by the International Maritime Organization in December 1990. However, since then IMO has actively pursued a strategy for implementing the OPRC Convention in close cooperation with interested governments and industry. The primary objective of this strategy is to enhance the capacity of countries to effectively carry out the requirements of the convention and strengthen IMO's ability to assist countries in this process. The strategy is realized by action taken by IMO's OPRC standing working group, in which government and industry experts participate, and by IMO staff, experts, and consultants as part of a technical cooperation program for the protection of the marine environment.

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Adams, Michael. "Developing an International Oil Spill Policy Strategy for the U.S." International Oil Spill Conference Proceedings 2003, n.º 1 (1 de abril de 2003): 913–17. http://dx.doi.org/10.7901/2169-3358-2003-1-913.

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ABSTRACT As called for under the International Convention on Oil Pollution Preparedness, Response and Co-operation, 1990 (OPRC), “Parties to the OPRC convention are required to establish measures for dealing with pollution incidents, either nationally or in co-operation with other countries.” As a signatory to OPRC the U.S. Government (USG) has pledged to assist other countries in the development of their own oil spill response capabilities and while USG has many agreements that meet the guidelines of assisting other countries, there is no formal engagement strategy for developing further agreements, no agency championing this effort, and there are many still requiring assistance. However, the United States Coast Guard (USCG) is uniquely positioned to perform the role of drafting an engagement strategy and working with the global community to assist those countries that have yet to develop an adequate oil spill response system of their own due to the lack of resources, expertise or both. There are many hurdles to enabling USCG to assume the OPRC assistance banner that have been previously addressed (Adams, IOSC 2001), which this paper will not seek to readdress. However, if USG does decide to move forward with an integrated policy there remains the need to develop an adequate engagement strategy. This strategy is necessary to ensure the limited resources available for foreign assistance are expended in the most cost effective, ethical and responsible manner possible. There are three alternative strategies I will analyze in an effort to determine the best suited for implementation of this policy. These three strategies are based primarily on 1) environmental need, 2) geographical proximity, and 3) political/economic interests. The goal of this strategy is to effectively implement the oil spill assistance policy alluded to previously in support of the U.S.'s pledge under OPRC. This paper will analyze the success of each strategy making a recommendation on which one USG should pursue.

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Chapman, Philip, e Huestis Holm. "CANADA'S SYSTEM OF SPILL RESPONSE: WILL IT ACTUALLY WORK?" International Oil Spill Conference Proceedings 1997, n.º 1 (1 de abril de 1997): 958–59. http://dx.doi.org/10.7901/2169-3358-1997-1-958.

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ABSTRACT Canadian policy on marine spill response and preparedness has undergone a significant transformation since the OPRC Convention. An ambitious plan was launched in 1993 that sought to achieve two things: the privatization of response operations and the enhancement of response capabilities. Various steps have been undertaken to implement an effective framework within which government and industry can operate. Substantial legislative, regulatory, and policy changes have gone a long way toward achieving the spirit and intent of the OPRC Convention. However, the implementation of that new system has not been without its problems.

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Bhamidimarri, Satya Prathyusha, Tessa R. Young, Muralidharan Shanmugam, Sandra Soderholm, Arnaud Baslé, Dirk Bumann e Bert van den Berg. "Acquisition of ionic copper by the bacterial outer membrane protein OprC through a novel binding site". PLOS Biology 19, n.º 11 (11 de novembro de 2021): e3001446. http://dx.doi.org/10.1371/journal.pbio.3001446.

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Copper, while toxic in excess, is an essential micronutrient in all kingdoms of life due to its essential role in the structure and function of many proteins. Proteins mediating ionic copper import have been characterised in detail for eukaryotes, but much less so for prokaryotes. In particular, it is still unclear whether and how gram-negative bacteria acquire ionic copper. Here, we show that Pseudomonas aeruginosa OprC is an outer membrane, TonB-dependent transporter that is conserved in many Proteobacteria and which mediates acquisition of both reduced and oxidised ionic copper via an unprecedented CxxxM-HxM metal binding site. Crystal structures of wild-type and mutant OprC variants with silver and copper suggest that acquisition of Cu(I) occurs via a surface-exposed “methionine track” leading towards the principal metal binding site. Together with whole-cell copper quantitation and quantitative proteomics in a murine lung infection model, our data identify OprC as an abundant component of bacterial copper biology that may enable copper acquisition under a wide range of conditions.

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Mais fontes

Teses / dissertações sobre o assunto "OPvrc"

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Jones, Jaclyn Leia. "The effects of social involvement on work performance of adults with developmental disabilities". CSUSB ScholarWorks, 2003. https://scholarworks.lib.csusb.edu/etd-project/2294.

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Livros sobre o assunto "OPvrc"

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Ontario Problem Gambling Research Centre. Gambling and problem gambling in first nations communities: OPGRC final report. Winnipeg, MB: Aboriginal Issues Press, 2005.

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1952-, Oakes Jill E., e Ontario Problem Gambling Research Centre., eds. Gambling and problem gambling in First Nations communities: OPGRC final report October 12, 2004. Winnipeg: Aboriginal Issues Press, 2005.

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Gambling and Problem Gambling in First Nations Communities: Opgrc Final Report October 12, 2004. Not Avail, 2005.

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OPRC-HNS Protocol : protocol on preparedness, response and co-operation to pollution incidents by hazardous and noxious substances, 2000. London: IMO, 2002.

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Organization, International Maritime. OPRC - HNS Protocol: Protocol on Preparedness, Response, and Co-operation to Pollution Incidents by Hazardous and Noxious Substances; 2000. IMO, 2002.

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6

OPRC Convention: International Convention on Oil Pollution Preparedness, Response and Co-operation, 1990, including final act of the conference and attachment (resolutions 1 to 10). London: IMO, 1991.

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Capítulos de livros sobre o assunto "OPvrc"

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Zorrilla, María Luisa, e Enzo Renato Hernández-Levi. "Empowered Reading Circles and Transliteracy". In Advances in Early Childhood and K-12 Education, 25–52. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-9750-7.ch002.

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For decades, reading circles have been important both as strategies to promote reading and as social environments for talking about what has been read. This chapter presents two educational experiences based on reading circles and empowered with the use of ICT in two private middle schools in Mexico: the enriched reading circle (ERC), a hybrid experience, and the online participatory reading circle (OPRC), a virtual experience. The second one was implemented in the context of physical distancing during the COVID-19 pandemic. The aim of both projects was to promote participatory reading and to develop transliteracy skills; this chapter presents some of the results.

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"International Convention on Oil Pollution Preparedness, Response and Co-operation (OPRC)". In Commercial Shipping Handbook, 229. Informa Law from Routledge, 2014. http://dx.doi.org/10.4324/9781315774695-88.

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"International Convention on Oil Pollution Preparedness, Response, and Co-operation (OPRC)". In Yearbook of International Cooperation on Environment and Development 1998–99, editado por Helge Ole Bergesen, Georg Parmann e Øystein B. Thommessen, 110–11. Routledge, 2018. http://dx.doi.org/10.4324/9781315066547-25.

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"Protocol on Preparedness, Response and Co-operation to pollution Incidents by Hazardous and Noxious Substances, 2000 (OPRC-HNS Protocol)". In Commercial Shipping Handbook, 279. Informa Law from Routledge, 2014. http://dx.doi.org/10.4324/9781315774695-114.

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Trabalhos de conferências sobre o assunto "OPvrc"

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Ghumman, Umar Farooq, Anton van Beek, Joydeep Munshi, TeYu Chien, Ganesh Balasubramanian e Wei Chen. "SDF-Based Inverse Process Design of Solar Cells Using Molecular Dynamics Simulations". In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-71595.

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Abstract Despite their lower weight, cheaper production cost, and diminished demand of metals, Organic Photovoltaic Cells (OPVCs) have not replaced conventional solar cells. The reason for this is their relatively low power conversion efficiency that could be a consequence of a lack in understanding of the underlying physics. More specifically, the influence of processing conditions and microstructure morphology on OPVC performance is still an open research area. In a previous study, we presented a spectral density function (SDF)-based design framework to optimize material performance with respect to its quasi-random microstructure (such as an OPVC). However, to guarantee manufacturability, the influence of processing conditions to material performance needs to be considered. In this study we present a two-step inverse design scheme which first identifies the optimal key microstructure descriptor(s) and then the optimal processing conditions. Dividing the design problem in two steps greatly benefits tractability as it allows the use of SDF reconstruction to reduce the dimensionality of the processing conditions. Subsequently, fewer costly high fidelity coarse-grained molecular dynamics simulations (or physical experiments) are required to identify the optimal processing conditions. We apply the introduced framework to optimize the performance of an OPVC with respect to volume fraction (i.e., chemical compositions) and annealing temperature. The inverse design approach results in a potential ten-fold decrease in the computational cost compared to direct process-performance optimization.

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Nicolau, Alexander. "Preparing HNS Contingency Plans in Compliance With the OPRC-HNS Protocol". In SPE International Conference on Health, Safety, and Environment in Oil and Gas Exploration and Production. Society of Petroleum Engineers, 2008. http://dx.doi.org/10.2118/111843-ms.

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Ghumman, Umar Farooq, Akshay Iyer, Rabindra Dulal, Aaron Wang, Joydeep Munshi, TeYu Chien, Ganesh Balasubramanian e Wei Chen. "A Spectral Density Function Approach for Design of Organic Photovoltaic Cells". In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-86154.

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Organic Photovoltaic Cells (OPVCs), having received significant attention over the last decade, are yet to be established as viable alternatives to conventional solar cells due to their low power conversion efficiency (PCE). Complex interactions of several phenomena coupled with the lack of understanding regarding the influence of fabrication conditions and nanostructure morphology have been major barriers to realizing higher PCE. To this end, we propose a computational microstructural design framework addressing the Processing–Structure–Performance (PSP) linkages for designing the active layer of P3HT:PCBM based OPVCs conforming to bulk heterojunction architecture. The framework pivots around the Spectral Density Function (SDF), a frequency space microstructure characterization and reconstruction methodology, for microstructure design representation. Nanostructure images obtained by novel Scanning Tunneling Microscopy are used to validate the applicability of SDF for representing active layer morphology in OPVCs. SDF enables a low dimensional microstructure representation that is crucial in formulating a parametrized microstructure optimization scheme. A level-cut Gaussian Random Field (governed by SDF) technique is used to generate reconstructions that serve as Representative Volume Elements (RVEs) for structure-performance simulations. A novel structure-performance simulation approach is developed using physics-based performance metric, Incident Photon to Converted Electron (IPCE) ratio, to account for the impact of microstructural features on OPVC performance. Finally, an SDF based computational IPCE optimization study using metamodels created using design of computer experiments over three design variables results in 36.75% increase in IPCE, underlining the efficacy of proposed design framework.

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