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Academic literature on the topic 'Cyclone Gonu, 2007'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 July 2024

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Journal articles on the topic "Cyclone Gonu, 2007"

Koohestani, Kamran, Mohammad Nabi Allahdadi, and Nazanin Chaichitehrani. "Oceanic Response to Tropical Cyclone Gonu (2007) in the Gulf of Oman and the Northern Arabian Sea: Estimating Depth of the Mixed Layer Using Satellite SST and Climatological Data." Journal of Marine Science and Engineering 9, no. 11 (November 9, 2021): 1244. http://dx.doi.org/10.3390/jmse9111244.

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The category 5-equivalent tropical Cyclone Gonu (2007) was the strongest cyclone to enter the northern Arabian Sea and Gulf of Oman. The impact of this cyclone on the sea surface temperature (SST) cooling and deepening of the mixed layer was investigated herein using an optimally interpolated (OI) cloud-free sea surface temperature (SST) dataset, climatological profiles of water temperature, and data from Argo profilers. SST data showed a maximum cooling of 1.7–6.5 °C during 1–7 June 2007 over the study area, which is similar to that of slow- to medium-moving cyclones in previous studies. The oceanic heat budget equation with the assumptions of the dominant turbulent mixing effect was used to establish relationships between SST and mixed layer depth (MLD) for regions that were directly affected by cyclone-induced turbulent mixing. The relationships were applied to the SST maps from satellite to obtain maps of MLD for 1–7 June, when Gonu was over the study area. Comparing with the measured MLD from Argo data showed that this approach estimated the MLDs with an average error of 15%, which is an acceptable amount considering the convenience of this approach in estimating MLD and the simplifications applied in the heat budget equation. Some inconsistencies in calculating MLD were attributed to use of climatological temperature profiles that may not have appropriately represented the pre-cyclone conditions due to pre-existing cold/warm core eddies. Estimation of the diapycnal diffusion that quantified the turbulent mixing across the water column showed consistent temporal and spatial variations with the calculated MLDs.

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Banan-Dallalian, Masoud, Mehrdad Shokatian-Beiragh, Aliasghar Golshani, Alireza Mojtahedi, Mohammad Ali Lotfollahi-Yaghin, and Shatirah Akib. "Study of the Effect of an Environmentally Friendly Flood Risk Reduction Approach on the Oman Coastlines during the Gonu Tropical Cyclone (Case Study: The Coastline of Sur)." Eng 2, no. 2 (April 15, 2021): 141–55. http://dx.doi.org/10.3390/eng2020010.

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Tropical cyclones may be destructive in the coastal region, such as the Gonu tropical cyclone, which affected the Arabian Peninsula and parts of southern Iran in 2007. In this study, a coupled MIKE 21/3 HD/SW (hydrodynamic/spectral wave) model was used to simulate the inland flooding inside the Sur port during the Gonu tropical cyclone. The MIKE 21 Cyclone Wind Generation (CWG) tool was utilized to generate the cyclone’s wind and pressure field. The required input data were obtained from the International Best Track Archive for Climate Stewardship (IBTrACS) and imported into the CWG tool. In this study, the wind and pressure fields were compared between the analytical vortex model and European Centre for Medium-Range Weather Forecasts (ECMWF) data during the Gonu cyclone passage. Moreover, by developing a new model, artificial Mangroves’ effect on inland flooding was investigated. The results show that, contrary to the ECMWF data, the analytical vortex models well captured the storm event’s wind and pressure field. Furthermore, the flood hazard is calculated based on the inundation depth, flow velocity, and area’s vulnerability. The flood hazard map shows that 5% of the coast is at high-risk, 49% is at medium-risk, and 46% is at low-risk class in the Sur port. By applying Mangroves as flood risk reduction, the high-risk area is almost completely removed. However, medium and low-risk zones increase by 50% and 50%, respectively. This information could be helpful in disaster risk reduction and coastal management in the future.

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DeviS, Sunitha, Somnath Dutta, and K. Prasad. "Energetics of super cyclone ‘GONU’ and very severe cyclonic storm ‘SIDR’." MAUSAM 65, no. 1 (December 20, 2021): 37–48. http://dx.doi.org/10.54302/mausam.v65i1.862.

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This paper discusses the energetics aspects of two tropical cyclones formed over the north Indian Ocean during 2007, viz., the Super Cyclonic Storm (GONU) and the Very Severe Cyclonic Storm (SIDR). From the analysis of various energetics terms such as the Eddy Available Potential Energy (AE), Zonal Available Potential Energy (AZ), Zonal Kinetic Energy (KZ), Eddy Kinetic Energy (KE) and their generation and inter-conversions i.e., G(AE), G(AZ), C(AE, KE), C(AZ, KZ), C(KZ, KE) and C(AZ, AE) have been computed on day to day basis during the periods of their intensifications over the domain 5° N to 25° N, 55° E to 75° E in respect of ‘GONU’ and 5° N to 25° N, 77° E to 97° E for ‘SIDR’. Besides the above, the area averaged value of s (Sigma), the vertically averaged Moist Static Energy (MSE), has also been computed on each day. Day-to-day evolution of these parameters is mapped and described. Some of the distinguishing features in the energetic of these two intense vortices which formed in entirely different climatological settings have been brought out. It is noticed that in the case of ‘GONU’, though both barotropic and baroclinic energy conversions have taken place during the life cycle, the intensification phase is characterized by an enhancement in AE, KE and vertically integrated Moist Static Energy. Enhancement in AE can be attributed to the generation of AE, which may again be attributed to the asymmetric latent heat of condensation associated with the asymmetric rainfall in the cyclone field. Enhancement in KE may be attributed to the enhancement in both barotropic and baroclinic conversion into KE. Though most of these observations made for ‘GONU’ are found to be attributable to ‘SIDR’ as well, the intensification of ‘SIDR’ appears to have more similarity to that of a typical growing mid-latitude baroclinic wave. In this case, the enhancement in AE, could also be attributed to positive C(AZ,AE), which is mainly due to interaction with mid-latitude baroclinic westerly wave. The energetics analysis also indicates that GONU had helped in the enhancement of seasonal mean meridional circulation where as the SIDR had inhibited the enhancement of seasonal mean meridional circulation.

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Anisetty, S. K. A. V. Prasad Rao, Ching-Yuang Huang, and Shu-Ya Chen. "Impact of FORMOSAT-3/COSMIC radio occultation data on the prediction of super cyclone Gonu (2007): a case study." Natural Hazards 70, no. 2 (September 29, 2013): 1209–30. http://dx.doi.org/10.1007/s11069-013-0870-0.

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Ikram, Farah, Kalim Ullah, and Deliang Chen. "Evaluation of Three Genesis Potential Indices for Tropical Cyclogenesis in the Arabian Sea: Two Case Studies Using WRF and ERA5." Monthly Weather Review 150, no. 12 (December 2022): 3275–303. http://dx.doi.org/10.1175/mwr-d-22-0048.1.

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Abstract Tropical cyclones (TCs) generated over the Arabian Sea can cause significant damage to infrastructure, human lives, landfall, and property near inshore and maritime trade route areas. A key to successful prediction of TCs is a skillful prediction of potential cyclogenesis locations. This study focuses on evaluating three genesis potential indices (GPIs) derived from a global reanalysis (ERA5) and dynamically downscaling using a regional model (WRF) for two TC cases: Gonu in 2007 and Kyarr in 2019, selected by analyzing the accumulated cyclone energy trend from the International Best Track Archive for Climate Stewardship (IBTrACS) dataset over the period of 1981–2019. The two TCs belong to category 4 and above on the Saffir–Simpson scale. To test the sensitivity of downscaling to cumulus parameterizations, two WRF experiments were conducted using the Kain–Fritsch and New Tiedke cumulus schemes, respectively. The calculated genesis locations with help of the three GPIs were compared with IBTrACS. The results show that 1) all indices have reasonable skills in reproducing genesis locations, although their performances differ somewhat; 2) the dynamic downscaling with two WRF experiments added value to the study by comparing two numerical schemes for estimating genesis locations; and 3) WRF with the New Tiedke and Kain–Fritsch schemes showed good skill in reproducing the spatial distribution of the most relevant dynamical parameters. The pattern correlations are well correlated with environmental parameters of untransformed GPI and higher correlations with binary logarithmic transformed GPI. The applicability to other cyclones is also tested (e.g., TC Nilofar in 2014) with encouraging results. This study demonstrates the usefulness of GPIs for forecasting TC genesis in the region. Significance Statement The trend analysis of accumulated cyclone energy (ACE) over the Arabian Sea (AS) shows an increase over the period of 1981–2019 with the highest ACE values for 2019. The genesis potential indices (GPI) show strong ability for use as a forecasting tool for tropical cyclone genesis, and hence, are helpful for providing a reference for future studies. WRF experiments were able to reproduce the GPI with slight differences from the observations and ERA5. WRF schemes show good performance in reproducing key meteorological fields. The analysis of the GPI and WRF schemes shows the potential to be implemented for maritime forecasts of the tropical cyclones in the region. This study will be helpful scientifically and strategically with a significant impact on socioeconomic activities in the region.

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Fonseca, António V., Luis F. M. Ribeiro, António Arêde, João Guedes, Esmeralda Paupério, Karim Karam, Aníbal Costa, and José E. T. Q. Menezes. "Suggested Methodology for Rehabilitation of Ancient Masonry Castles and Forts on Rock Hills." Soils and Rocks 37, no. 2 (May 1, 2014): 133–50. http://dx.doi.org/10.28927/sr.372133.

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Forts, including in this designation military castles, present high complexity due to their nature. Methodologies followed in the rehabilitation of forts are briefly presented, with the emphasis on characterization of materials and rock masses and on tests and numerical models developed for ancient forts. Studies concerning forts with Portuguese legacy are presented. The first case is related with rehabilitation of foundations and walls of the Guimarães Castle, Portugal. The causes of the appearance of holes or torn threads in the exposed face of the wall and the tower of the extreme southwest of the castle were assessed. The intervention performed was focused on the stabilization of the rock mass and careful sealing of discontinuities in the high strength rock mass and consolidation of the most weathered fractured rock mass. The second case is related to forts existing at Muscat, Oman. The protection of the Jalali Fort is studied in detail. During 2007, cyclone Gonu caused substantial damage to the seawall adjacent to the fort. The study addresses the redesign of the seawall.

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Al- Shaqsi, Obaid Said. "Public Attitudes Towards Omani Media Coverage of “Gono” Cyclone Crisis." Journal of Arts and Social Sciences [JASS] 6, no. 1 (January 1, 2015): 67. http://dx.doi.org/10.24200/jass.vol6iss1pp67-84.

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This survey study aimed at investigating the relationship between Omani media management of the 2007 Gono cyclone crisis and people’s behavioral responses and their attitudes towards media performance. The study was founded on the general principles of the Situational Crisis Communication theory and Stakeholders theory. A convenient sample of 140 affected individuals from three different places in Oman participated in this study. The results indicated that 96% of the informants followed Omani media warnings about the cyclone. The results also showed a positive correlation between respondents’ belief that the media have provided them with swift and transparent messages and addressed their interests and emotional concerns on one hand, and adopting positive behavioral responses, on the other hand. Overall, respondents were satisfied with Omani media performance during the different stages of the cyclone crisis.

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Al- Shaqsi, Obaid Said. "Public Attitudes Towards Omani Media Coverage of “Gono” Cyclone Crisis." Journal of Arts and Social Sciences [JASS] 6, no. 1 (January 1, 2015): 67–84. http://dx.doi.org/10.53542/jass.v6i1.1077.

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Liang, Jia, Liguang Wu, Xuyang Ge, and Chun-Chieh Wu. "Monsoonal Influence on Typhoon Morakot (2009). Part II: Numerical Study." Journal of the Atmospheric Sciences 68, no. 10 (October 1, 2011): 2222–35. http://dx.doi.org/10.1175/2011jas3731.1.

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Abstract In the second part of this study, numerical experiments are conducted to investigate the influences of multi-time-scale monsoonal flows on the track change of Typhoon Morakot (2009). While the control simulation captures the slowing and northward deflections in the vicinity of Taiwan Island, the highly asymmetric rainfall structure, and the associated rainfall pattern, sensitivity experiments suggest that the westward movement prior to the landfall on Taiwan and the subsequent northward shifts in the vicinity of Taiwan were closely associated with the interaction between Morakot and multi-time-scale monsoonal flows. Prior to the landfall on Taiwan, Morakot moved westward directly toward Taiwan because of a synoptic wave train–like pattern, which consisted of Goni over mainland China, Morakot, and a cyclone over the western North Pacific with an anticyclone to the west of Morakot. Numerical simulation suggests that strong northerly winds between Morakot and the anticyclone reduced the northward steering component associated with the low-frequency flow prior to the landfall. Numerical experiments confirm that the northward track shifts that occurred in the vicinity of Taiwan Island were a result of the coalescences of Morakot with a quasi-biweekly oscillation (QBW)-scale gyre prior to the landfall on Taiwan and a Madden–Julian oscillation (MJO)-scale gyre in the Taiwan Strait. The simulation of Morakot and the associated sensitivity experiments agree with the previous barotropic study that the interaction between tropical cyclones and low-frequency monsoon gyres can cause sudden changes in tropical cyclone tracks.

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Abdalla, Osman, and Rashid bin Yahya Al-Abri. "Groundwater recharge in arid areas induced by tropical cyclones: lessons learned from Gonu 2007 in Sultanate of Oman." Environmental Earth Sciences 63, no. 2 (August 12, 2010): 229–39. http://dx.doi.org/10.1007/s12665-010-0688-y.

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Books on the topic "Cyclone Gonu, 2007"

Maʻnī, Sayf ibn Sulaymān. Mawʻid maʻa al-iʻṣār al-madārī Jūnū. Salṭanat ʻUmān: Muʼassasat ʻUmān lil-Ṣiḥāfah wa-al-Nashr wa-al-Iʻlān, 2007.

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مدن تئن وذكريات تغرق: Sāʻāt Iʻṣār Jūnū al-ʻaṣībah. Bayrūt: Muʼassasat al-Intishār al-ʻArabī, 2008.

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Book chapters on the topic "Cyclone Gonu, 2007"

Tyagi, Ajit, M. Mohapatra, B. K. Bandyopadhyay, Charan Singh, and Naresh Kumar. "The First Ever Super Cyclonic Storm “GONU” over the Arabian Sea During 1-7 June 2007: A Case Study." In Indian Ocean Tropical Cyclones and Climate Change, 305–13. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3109-9_35.

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Landry, Olivia. "Crisis of Cinema/Cinema of Crisis: The Car Crash and the Berlin School." In Cinema of Crisis, 105–18. Edinburgh University Press, 2020. http://dx.doi.org/10.3366/edinburgh/9781474448505.003.0007.

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I revisit some widely known films of the Berlin School: Valeska Grisebach’s Sehnsucht (Longing , 2006) and Christian Petzold’s Yella (2007) and Jerichow (2008). In their diverging narrative treatment of the car crash, these three examples offer a striking cycle. They were all released within a three-year period leading up to the global economic crisis. Each film portrays the promises, aspirations and failings of neoliberalism via the literal drive for the good-life fantasy, which turns sour. A return to the car crash in German cinema leading up to a moment of heightened financial crisis and in an era of post-cinematic digitisation and new media trends offers a double commentary on the age-old kinship of cinema and crisis. Incurring violence and even death, the crash in these Berlin School films introduces a new level of impact and precarity that is so far gone that it has often already hit bottom.

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Dorfman, Jay. "Assessment and Technology-Based Music Instruction." In Theory and Practice of Technology-Based Music Instruction. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199795581.003.0010.

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Assessment is such an important cornerstone of the current educational landscape that it must be a part of discussion about any educational topic, including TBMI. To paraphrase Duke (2005), rather than thinking about assessment as the culmination of an educational cycle, teachers should embed assessment into every lesson, every activity, and our plans for everything that comes next. Duke stated, “The distinction between the assessments and the substance of instruction day to day should be diminished to the point that the day-to-day activities of instruction closely resemble the assessments themselves” (2005, p. 71). In a TBMI class, this is the scenario for which teachers should strive. Still, assessment remains a thorny issue for TBMI teachers because they are often unaccustomed to assessing the types of work that students do in TBMI classes, examples of which were seen in the sample lessons in chapter 6. Assessing what students do informs us about the extent to which they retain information and achieve learning objectives, the quality of that learning, and students’ abilities to apply conceptual understanding to both familiar and novel situations. If we do it for no other reason, assessing students tells us when they are ready to go on to the next bit of information, the next activity, or the next level of complexity of work. I observed Mr. U during a day trip to his school in a suburb in the northeast United States. Mr. U has been teaching music technology classes at the high school level for about 15 years—perhaps the longest of any teacher profiled in this book—and has been nationally recognized for his excellence in doing so. Over that time, he has gone through many changes of equipment, software, and course designs. He has developed a vast and sophisticated set of projects for his students, who can take level 1 and 2 music technology classes. Most of the assignments and requirements are housed on a website that Mr. U developed as part of a professional development project. His students clearly enjoy the music technology classes he teaches.

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Conference papers on the topic "Cyclone Gonu, 2007"

Lakhapati, Deepak. "Power Restoration Solution after Major Cyclone: "Gonu": Hit Oman in June 2007." In Electrical Transmission and Substation Structures 2009. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41077(363)39.

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De Bhowmick, A. K., Masaud Awlad Thani, and Younis Al-Rawahi. "Cyclone ‘GONU’ and reliability of main interconnected transmission system of Oman." In 2007 Australasian Universities Power Engineering Conference (AUPEC). IEEE, 2007. http://dx.doi.org/10.1109/aupec.2007.4548022.

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Golshani, Aliasghar, and Soheila Taebi. "Numerical Modeling and Warning Procedure for Gonu Super Cyclone along Iranian Coastlines." In Solutions to Coastal Disasters Congress 2008. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40968(312)24.

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Kwa, Tom, and Thorsten Teutsch. "Long-Term Reliability of Solder Joints on Wafer-Level Packaged Accelerometer for Medical Applications." In ASME 2007 2nd Frontiers in Biomedical Devices Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/biomed2007-38035.

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Miniaturization of devices is driving replacement of electronic components with surface mount technology (SMT) equivalent parts, including any embedded sensing devices. In many cases the size of the sensor is restricted by the minimum size of the package rather than by the die. Other solutions to preserve real-estate involve manual mounting of the die onto substrates that have gone through an SMT assembly process. The +/-2g accelerometer presented here is, to our knowledge, the first wafer-level packaged device with solderable terminals that allows the silicon die to be mounted directly onto a substrate in a standard SMT process and without the need for stressisolating interposers. With its small footprint and ceiling requirements (2.1 × 2.9 × 0.8 mm3), and robustness and high performance it is the smallest commercially-available packaged accelerometer suitable for medical applications where these characteristics are critical. The device features terminals that are electrically and mechanically separated but robust enough to withstand large shear forces that may occur during use and board assembly. The device was solder mounted on a variety of substrates without affecting its performance. Most significantly, both device and solder joints were able to withstand extended thermal cycling over a wide temperature range (-55 to 125°C). In this paper, we present the device design, the performance and the long-term reliability test results of this novel and high-performance device on a variety of substrates and solder materials.

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Alexander, Brentan R., and Ahmed F. Ghoniem. "Analysis and Optimization of the Coupled Parameters of the Graz Cycle." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50588.

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The Graz Cycle is a unique power cycle design that has been proposed for the conversion of coal derived syngas or natural gas into mechanical energy while capturing carbon dioxide. The hydrocarbon is burned in pure oxygen, and water is condensed before a portion of the products are recycled back. Previous analyses have shown theoretical efficiencies of 56.12% [1]. Such a high theoretical efficiency, combined with carbon dioxide capture, makes this cycle design highly attractive. Little previous work has gone into optimizing the Graz Cycle design. Optimizing complex power cycles is complicated by the fact that a change in the operating conditions of one component of the cycle can alter temperatures and pressures around the rest of the cycle, impacting the performance of other cycle machinery. This paper addresses this issue through the application of a multivariable optimization algorithm. We have developed a model for the Graz Cycle using simplified equations of state and verified the results against previous studies. This model predicts a cycle efficiency of 56.72%, while the orginal calculation shows a value of 56.12% [1]. These values do not account for efficiency losses in the liquefaction and sequestration of carbon dioxide, or the efficiency penalty associated with coal gasification when syngas is used. A sensitivity analysis was performed on our model in order to identify the impact of key system parameters, including cycle temperatures, pressures, and molar flow rates, on the efficiency. This procedure, which amounts to changing one parameter at a time to maximize efficiency, resulted in an optimized efficiency of 57.84%. A computational optimization algorithm based on a simulated annealing scheme was then devised and used to alter system parameters simultaneously. An overall theoretical efficiency of 60.11% was achieved using this method. Another optimization scheme which accounts for hardware limitations and plant capital costs was also studied. This optimization yielded an efficiency of 58.76% while limiting the system high pressure to 110 bar. The results reveal that complex relationships between plant costs, fuel costs, and overall efficiency can be taken into account in a single unified analysis that minimizes a plant’s lifetime cost per unit of output. We demonstrate that the optimized cycle is actually simpler that the original cycle, without losing efficiency.

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Sullivan, Shaun D., Jason Farias, James Kesseli, and James Nash. "Mechanical Design and Validation Testing for a High-Performance Supercritical Carbon Dioxide Heat Exchanger." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63639.

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Supercritical carbon dioxide (sCO2) Brayton cycles hold great promise as they can achieve high efficiencies — in excess of 50% — even at relatively moderate temperatures of 700–800 K. However, this high performance is contingent upon high-effectiveness recuperating and heat rejection heat exchangers within the cycle. A great deal of work has gone into development of these heat exchangers as they must operate not only at elevated temperatures and very high pressures (20–30 MPa), but they must also be compact, low-cost, and long-life components in order to fully leverage the benefits of the sCO2 power cycle. This paper discusses the mechanical design and qualification for a novel plate-fin compact heat exchanger designed for sCO2 cycle recuperators and waste heat rejection heat exchangers, as well as direct sCO2 solar absorber applications. The architecture may furthermore be extended to other very high pressure heat exchanger applications such as pipeline natural gas and transcritical cooling cycles. The basic heat exchanger construction is described, with attention given to those details which have a direct impact on the durability of the unit. Modeling and analysis of various mechanical failure modes — including burst strength, creep, and fatigue — are discussed. The design and construction of test sections, test rigs, and testing procedures are described, along with the test results that demonstrate that the tested design has an operating life well in excess of the 100,000 cycles/90,000 hour targets. Finally, the application of these findings to a set of design tools for future units is demonstrated.

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Lawson, Craig, and Paul C. Ivey. "The Measurement of Turbomachinery Blade Vibration Through Tip Timing With Capacitance Tip Clearance Probes." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53563.

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Turbomachinery blade vibrations can cause High Cycle Fatigue, which reduces blade life. In order to observe this vibration a non-intrusive monitoring system is sought. The vibration can be detected by measuring blade tip timing since in the presence of vibration the blade timing will differ slightly from the passing time calculated from rotor speed. Much research and development has gone into investigating the ability of optical probes to achieve this. However, this paper looks at the potential for a dual use capacitance probe sensor to measure both tip timing and tip clearance. This paper provides new insights into the ability of a commercially available capacitance probe tip clearance measurement system for application as a non-intrusive turbomachinery blade tip timing measurement device. This is done by correlating capacitance probe tip timing results with simultaneously measured blade-mounted strain gauge vibration results and precise rotational speeds. Thus the characterisation of the performance of the capacitance probe system when measuring blade vibration on a full-sized low-speed research compressor is analysed and reported.

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McGill, Robert O., Kari L. Den Herder, Daniel B. Patten, and Steven P. Queen. "Recent Applications of ASME Code Case N-513 for Evaluation of Nonplanar Leaking Flaws." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61639.

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ASME Code Case N-513, Evaluation Criteria for Temporary Acceptance of Flaws in Moderate Energy Class 2 or 3 Piping, provides evaluation rules for the temporary acceptance of flaws, including through-wall flaws, in moderate energy Class 2 or 3 piping without performing repair/replacement activities. The Code Case has gone through three revisions with the latest approved by ASME Section XI being N-513-2. The Code Case allows for evaluation of both planar and nonplanar flaws. The planar flaw evaluation uses the rules in Appendix C of ASME Section XI. The nonplanar flaw evaluation uses the procedure provided in Code Case N-480. This Code Case has been used widely in the nuclear industry ever since it was published. Its use is expected to grow with plant aging and especially since Revision 2 was recently endorsed by the NRC in Regulatory Guide 1.147 without condition. The paper describes three specific applications of the Code Case to accept leaking flaws in piping components for continued operation till the end of the operating cycle when repairs could be performed. The use of this Code Case thus avoided costly and unnecessary shutdown of the plants in these cases. The evaluation procedures using this Code Case for these instances are described in the paper.

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Knauss, Ralf, Lukas E. Wiesegger, Rolf Marr, and Ju¨rgen J. Brandner. "Dynamic Optimization of an Evaporator by a Nonlinear Model Predictive Controller for Operation at Modular Micro Rectification." In ASME 2009 7th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2009. http://dx.doi.org/10.1115/icnmm2009-82100.

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Arranging micro-structured equipment to plants whole production processes can be realized with maximum efficiency in tightest space. Unit operations are thereby represented as individual functional modules in shape of micro devices. In a multi unit operation plant a correspondingly large number of manipulable variables have to be coordinated. Due to the design of micro-scaled devices plants form sophisticated systems, while for a fully optimized control still no common satisfying solutions exist. A system of modular, discontinuous phase contacting, micro rectification consists of unit operations heating, cooling, mixing and separating. Heat exchangers, mixers and cyclones for phase separation can be arranged to a counter-current rectification system with maximum mass-transfer efficiency every unit. Operating an electrical heated evaporator for modular rectification purposes a strong coupling of mass flow with the vapor fraction and the outlet temperature can be observed [4]. Operating at a predefined state for mass flow, temperature and vapor fraction may only be possible with difficulties using traditional methods of linear control technology. For dynamic optimization of the multivariable micro-structured evaporator principle of Nonlinear Model Predictive Control (NMPC) was generically formulated in C++ and implemented to LABVIEW 7. Every discrete time step an objective function is generated from nonlinear process models in the form of grouped NARX-polynomials. Optimal sequences of control actions for plant operation are evolved. The resulting constrained cost function is non-convex making detection of relative local optimum a difficult task. This obstacle can be gone around using heuristic optimization algorithm in combination with traditional techniques. Based on experimental results it was demonstrated that NMPC keeps the coupled variables mass flow and temperature energy saving with minimal control activity in the entire two-phase region on their set-points.

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Mostafavi Tehrani, S. Saeed, Yashar Shoraka, Robert A. Taylor, and Chris Menictas. "Performance Analysis of High Temperature Sensible Heat Thermal Energy Storage Systems for Concentrated Solar Thermal Power Plants." In ASME 2017 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ht2017-5091.

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Due to their relatively high capital and environmental cost of two-tank molten salt thermal storage systems, a significant amount of research has gone into looking for sensible and latent thermal energy storage alternatives suitable for concentrated solar thermal (CST) plants. Despite a large number of developments in the last decade, comparative studies among promising options have been lacking. In particular, only a few comparative studies are available in which thermal energy storage (TES) systems are integrated as an active subcomponent of CST plant. Therefore, this study compares selected sensible heat thermal energy storage systems based on their integrated performance with other CST components (e.g. a tower -based CST plant with a Rankine cycle) over a year of operation. In the present study, annual performances of single-medium thermocline (SMT), double-medium thermocline (DMT), and shell-and-tube (ST) system were compared with that of a conventional two-tank molten salt storage system. Concrete with porosity of 0.2 (concrete occupies 80% of the system) was selected as a low cost filler material in the DMT and ST systems. The systems were sized for 15 hours of storage capacity and integrated into a validated 19.9 MWe Gemasolar power plant model with solar multiple of 2.5. Before performing annual integrated simulations, an optimum design of each storage system was selected based on a performance analysis of the storage system over a constant 15 hours discharge. A CST plant with a two-tank molten salt system enables the highest amount of electricity generation in a year followed by the SMT and DMT systems, which resulted in 7% and 9% less electricity generation, respectively. For the CST plant with ST system, 20% less electricity was generated over a year. Overall, this study provides a methodology for the comparison of the TES alternatives, and it gives insight the most promising alternative for replacing two-tank molten salt systems.

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Reports on the topic "Cyclone Gonu, 2007"

Yousef, Shahinaz, M. A. El-Rafy, and Huma Abdallah Thani Al Hadabi. Solar forcing on cyclones - case study: Gonu 2007. Edited by Lotfia Elnai and Ramy Mawad. Journal of Modern trends in physics research, December 2014. http://dx.doi.org/10.19138/mtpr/(14)111-117.

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