Relevant bibliographies by topics / Gas build-up

Academic literature on the topic 'Gas build-up'

Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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Journal articles on the topic "Gas build-up"

Lindley, David. "Lab death blamed on gas build-up." Nature 357, no. 6380 (June 1992): 620. http://dx.doi.org/10.1038/357620b0.

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Ivings, M. J., S. E. Gant, C. J. Saunders, and D. J. Pocock. "Flammable gas cloud build up in a ventilated enclosure." Journal of Hazardous Materials 184, no. 1-3 (December 2010): 170–76. http://dx.doi.org/10.1016/j.jhazmat.2010.08.020.

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Asad, Usman, and Jimi Tjong. "Transient Build-up and Effectiveness of Diesel Exhaust Gas Recirculation." SAE International Journal of Engines 7, no. 1 (April 1, 2014): 172–82. http://dx.doi.org/10.4271/2014-01-1092.

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Jodica, Jodica, Onnie Ridaliani, and Ghanima Yasmaniar. "ANALISIS PRESSURE BUILD-UP RESERVOIR GAS KONDENSAT DALAM FORMASI KARBONAT." PETRO:Jurnal Ilmiah Teknik Perminyakan 8, no. 4 (January 1, 2020): 153. http://dx.doi.org/10.25105/petro.v8i4.6207.

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Different flow region will form in the reservoir when the gas condensate fluid flows with a bottom hole pressure below the dew point pressure. This flow region can be identified by the pressure build-up test analysis. This analysis can be done well on reservoir with homogeneous system and becomes more complex on reservoir with heterogeneous system. The purpose of this study is to find informations and characteristics about carbonate reservoir with gas condensate. Reservoir parameters that can be obtained are initial reservoir pressure (pi), permeability (k), skin factor (s), reservoir boundary (boundary), drainage area, and average reservoir pressure ( pr ). "JD-1" exploratory well penetrated the carbonate formation with the gas condensate hydrocarbon content. The well test analysis conducted is pressure analysis with pressure build-up testing and theanalysis results show a reservoir with a two-layer model, permeability value of 154 md, skin 13.8, initial pressure 3286.3 psia, and average reservoir pressure of 3285.7 psia.

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Arita, Kiyoshi, and Tanemasa Asano. "Gas Species Dependent Charge Build-Up in Reactive Ion Etching." Japanese Journal of Applied Physics 35, Part 1, No. 12B (December 30, 1996): 6534–39. http://dx.doi.org/10.1143/jjap.35.6534.

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Karnaukhov, M. L., M. Maregatti, Sh Z. Mirboboev, and L. V. Kravchenko. "PHASE BEHAVIOR OF GAS-CONDENSATE FLUIDS DURING WELL TESTING." Oil and Gas Studies, no. 3 (June 30, 2015): 60–66. http://dx.doi.org/10.31660/0445-0108-2015-3-60-66.

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Hydrodynamic studies in gas-condensate wells allow determining the features of fluids flow in the gas condensate reservoir by build-up curves. A variation in the shape of the build-up curve may reflect a behavior of fluids in the reservoir, that is the nature of the fluids motion in porous media. The possibility of identification of characteristics of the combined liquid and gas filtration zone by build-up curves, as well as the radius of the zone of gas-condensate blockage is shown. Based on the examples of the log-log build-up graph in Venezuelan and Russian fields the exis-tence of the characteristic shape part on the build-up curves was demonstrated, evidencing the retrograde processes occurring in the reservoir.

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Grattoni, C. A., R. I. Hawes, and R. A. Dawe. "Production of gas from waterflood residual oil: gas saturation build-up and relative permeabilities." Petroleum Geoscience 7, no. 2 (June 2001): 131–36. http://dx.doi.org/10.1144/petgeo.7.2.131.

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Abdalla, Ayman M., Tayseer I. Al-Naggar, and Aishah M. Bashiri. "Radon gas build up using alpha scintillation cell: Experimentally and theoretically." Applied Radiation and Isotopes 175 (September 2021): 109796. http://dx.doi.org/10.1016/j.apradiso.2021.109796.

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Santoso, R. K., S. D. Rahmawati, A. Gadesa, and D. Wahyuningrum. "Scale Build-Up Prediction of FeS and FeCO3in Gas Production Pipes." Journal of Physics: Conference Series 877 (July 2017): 012029. http://dx.doi.org/10.1088/1742-6596/877/1/012029.

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Danko, M. Yu, I. M. Indrupskiy, and E. V. Shanin. "Analysis of the Pressure Build Up Taking into Account Nonequilibrium Gas Dissolution." Oil and Gas Technologies 130, no. 5 (2020): 47–54. http://dx.doi.org/10.32935/1815-2600-2020-130-5-47-54.

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The article discusses practical issues of modeling the reverse dissolution of gas released from oil, taking into account the nonequilibrium phase transition. An approximate method has been developed for taking into account the nonequilibrium gas dissolution process based on standard reservoir flow simulators without the corresponding option. The developed methodology was tested on the example of pressure build up (PBU) taken on a real field. The possibility of determining the characteristic relaxation time from the PBU is demonstrated in the framework of relaxation models for nonequilibrium phase transitions. The effect of nonequilibrium phase transitions on the dynamics of pressure recovery is determined. Well testing design is proposed that makes it possible to detect nonequilibrium gas dissolution and determine the necessary parameters for its consideration in flow simulations.

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Dissertations / Theses on the topic "Gas build-up"

Amante, Joseph David. "Scanning Methods as Monitoring, Verification, and Accounting tools for CO₂ Sequestration in Unconventional Gas Reservoirs." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/76047.

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Unconventional gas reservoirs in carbon dioxide sequestration activities is a relatively new and unexplored concept currently undergoing pilot scale testing. Sequestration has the potential for enhancing gas recovery while mitigating carbon dioxide to long term storage structures. Due to the extremely complex systems associated with these unconventional reservoirs, modeling becomes difficult to predict accurately. This thesis presents methods to increase the confidence of inferred parameter testing for unconventional reservoir sequestration in both seam coal bed methane wells and a shale wells. Various tests include the use of computed tomography coupled with Avizo modeling software, inductively coupled mass spectrometer fluid transport analysis, pressure transient build tests, liquid level detection, and desorption analysis coupled with cleat image analysis. Analyses of coals performed by both environmental scanning electron microscope (ESEM) and micro CT demonstrate that distributions of cleat porosity in coals are anisotropic and not correlated to the seam depth or location. ESEM is used with micro CT scanning to verify the results before and after the impregnation of the carbonic acid. The micro CT data in Avizo Fire© was used calculate an increase in cleat permeability by 25%. The increase of major flow pathways is caused by the dissolution of carbonates. Changes in the structures were observed qualitatively through ESEM and micro CT and quantitatively through Avizo and inductively coupled mass spectrometry. The results of comparative study between the cleat structures and the desorption of various seams indicate a trend in the cleat porosity and the desorption rate of the coals as well as the cleat porosity and the total gas in various seams.
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Books on the topic "Gas build-up"

WS Atkins Science and Technology. Application of Reynolds stress modelling to gas build-up and external dispersion. [Sudbury]: HSE Books, 1999.

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Gas/vapour Build Up on Offshore Structures (Offshore Technology Information). Health and Safety Executive (HSE), 1992.

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Application of Reynolds Stress Modelling to Gas Build-up and External Dispersion (Research Report). Health and Safety Executive (HSE), 1999.

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Jones, Jules. Build Up: Mindscan. Loose Id, LLC, 2005.

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Khan, Nayema, and John Pawlowski. Disruption of Diffusion. Edited by Matthew D. McEvoy and Cory M. Furse. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190226459.003.0020.

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Adequate gas exchange in the lungs requires a balance between three key processes: ventilation (V), the flow of gas from the environment to the alveoli; perfusion (Q), the circulation to the pulmonary capillary beds; and diffusion of the gas from the alveolar space into the alveolar capillaries. This chapter discusses the management of diseases of the air space, which include secretions, pneumonia, pulmonary edema, and hemoptysis. Collectively these conditions result in the build-up of fluid in the alveolar space and thickening of the alveolar membrane, leading to a mismatch in ventilation and perfusion (V/Q mismatch). Both anesthesia and disease states can adversely affect gas exchange and the chapter discusses strategies to maximize a patient’s pulmonary status in order to minimize perioperative pulmonary complications.

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Beydon, Laurent, and Flavie Duc. Inhalational anaesthetic agents in critical illness. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0046.

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Inhalational anaesthetic agents have limited applications in the intensive care unit (ICU), as their delivery requires specific equipment, which are not routinely available. Sevoflurane and isoflurane are the two agents eligible for this purpose. They both show good clinical tolerance and versatility, but may raise cerebral blood flow above 1 minimum alveolar concentration. This property makes them unsuitable for sedation in patients suffering from acute brain injury. Sevoflurane is known to be partly metabolized via the cytochrome pathway in inorganic fluoride. This latter accumulates in a dose- and time-dependent manner, especially in a closed circuit with soda lime. However, no clinical renal injury has been proven, despite several studies reporting on sevoflurane in ICUs. A fresh gas flow above 2 L/min is required to limit inorganic fluoride build-up. Halogenates have been proven to allow efficient sedation in ICU patients for up to several days. They may be considered as therapeutic agents especially in refractory status asthmaticus. Insufficient data exist to recommend halogenates to treat status epilepticus. Nitrous oxide, in 50% oxygen, may serve to allow sedation/analgesia for short and moderately procedures. Xenon, an inert gas that discloses anaesthetic properties with extremely fast onset and recovery, and also has no haemodynamic side effects remains confined to the operating theatre. It requires specific anaesthetic machines and is, at present, too expensive to represent a routine inhalational anaesthetic agent.

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Ramirez-Valles, Jesus. Finding Compañeros. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252036446.003.0008.

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This chapter describes the changes brought about by community involvement. Community involvement works as an epiphany for Latino GBT activists. It is a process whereby the “old self” is transformed into a new and different self. Indeed, the organizations these Latinos belong to—as well as the larger AIDS and gay movements—shape the personal changes activists undergo. The group provides them with information, a set of meanings, and a direction to change their lives. The group also helps them to reinterpret old and new behaviors and to build an identity based on the group culture. The process of change is thus set up and made possible through the acquisition of a new set of meanings and acts. These newly gained elements are not individual. Rather, they are created and shared by compañeros in a group or organization.

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D'Emilio, John. Memories of a Gay Catholic Boyhood. Duke University Press, 2022. http://dx.doi.org/10.1215/9781478023166.

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John D’Emilio is one of the leading historians of his generation and a pioneering figure in the field of LGBTQ history. At times his life has been seemingly at odds with his upbringing. How does a boy from an Italian immigrant family in which everyone unfailingly went to confession and Sunday Mass become a lapsed Catholic? How does a family who worshipped Senator Joseph McCarthy and supported Richard Nixon produce an antiwar activist and pacifist? How does a family in which the word divorce was never spoken raise a son who comes to explore the hidden gay sexual underworld of New York City? Memories of a Gay Catholic Boyhood is D’Emilio’s coming-of-age story in which he takes readers from his working-class Bronx neighborhood to an elite Jesuit high school in Manhattan to Columbia University and the political and social upheavals of the late 1960s. He shares his personal experiences of growing up in a conservative, tight-knit, multigenerational family, how he went from considering entering the priesthood to losing his faith and coming to terms with his same-sex desires. Throughout, D’Emilio outlines his complicated relationship with his family while showing how his passion for activism influenced his decision to use research, writing, and teaching to build a strong LGBTQ movement. This is not just John D’Emilio’s personal story; it opens a window into how the conformist baby boom decade of the 1950s transformed into the tumultuous years of radical social movements and widespread protest during the 1960s. It is the story of what happens when different cultures and values collide and the tensions and possibilities for personal discovery and growth that emerge. Intimate and honest, D’Emilio’s story will resonate with anyone who has had to chart their own path in a world they did not expect to find.

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Book chapters on the topic "Gas build-up"

Sun, Hedong, Yongping Cui, Xiaopei Wang, Jianye Zhang, and Wen Cao. "Build-up Analysis of Multi-Well System in Naturally Fractured HTHP Gas Reservoirs." In Springer Series in Geomechanics and Geoengineering, 1850–69. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7560-5_166.

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Ravella, Sreenivas Rao, David J. Warren-Walker, Joe Gallagher, Ana Winters, and David N. Bryant. "Addressing Key Challenges in Fermentative Production of Xylitol at Commercial Scale: A Closer Perspective." In Current Advances in Biotechnological Production of Xylitol, 181–204. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04942-2_9.

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AbstractXylitol has been recognized by the US Department of Energy (DOE) as one of the top 12 value-added chemicals obtained from biomass, with a world market of 200,000 tonnes per year. The global xylitol market is expected to reach a value of US$ 1 Billion by 2026 growing at a compound annual growth rate (CAGR) of 5.8% during 2021–2026. Historically, the commercial xylitol production process has been dependent on the chemical hydrogenation of xylose. Several xylitol production plants, mainly in China that use the chemical process have had to reduce their production capacity to address regulations governing sustainability and environmental standards. In this chapter, key challenges and possible solutions for fermentative xylitol production at commercial scale are discussed in terms of: (1) Feedstock supply for commercial production plants; (2) Industrial biomass pretreatment; and (3) Lessons learned from industrial operations. These are drawn together to identify technology gaps and scaling-up challenges in light of the capital expenditure required to build a state-of-the art xylitol industrial biotechnology (IB) production facility and the potential to reduce climate change impact and contribute towards achieving net-zero targets.

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Wild, Robert, Moses Egaru, Mark Ellis-Jones, Barbara Nakangu Bugembe, Ahmed Mohamed, Obadiah Ngigi, Gertrude Ogwok, Jules Roberts, and Sophie Kutegeka. "Using Inclusive Finance to Significantly Scale Climate Change Adaptation." In African Handbook of Climate Change Adaptation, 2565–90. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45106-6_127.

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AbstractReversing land degradation and achieving ecosystem restoration and management are routes to climate change adaptation and mitigation. The financial resources to achieve this are increasingly available. A major challenge is the absence of scalable mechanisms that can incentivize rapid change for rural communities at the decade-long time scale needed to respond to the climate emergency. Despite moves toward inclusive green finance (IGF), a major structural gap remains between the funding available and the unbankable small-scale producers who are stewards of ecosystems. This chapter reports on inclusive finance that can help fill this gap and incentivizes improved ecosystem stewardship, productivity, and wealth creation. A key feature is the concept of eco-credit to build ecosystem management and restorative behaviors into loan terms. Eco-credit provides an approach for overcoming income inequality within communities to enhance the community-level ecosystem governance and stewardship. The paper discusses the experience of implementing the Community Environment Conservation Fund (CECF) over a 8-year-period from 2012. The CECF addresses the unbankable 80% of community members who cannot access commercial loans, has c. 20,000 users in Uganda and pilots in Malawi, Kenya, and Tanzania. The model is contextualized alongside complementary mechanisms that can also incentivize improved ecosystem governance as well as engage and align communities, government, development partners, and the private sector. This complementary infrastructure includes commercial eco-credit as exemplified by the Climate Smart Lending Platform, and the community finance of the Village Savings and Loans Associations (VSLA) model upon which CECF builds. The paper describes the technologies and climate finance necessary for significant scale-up.

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Wild, Robert, Moses Egaru, Mark Ellis-Jones, Barbara Nakangu Bugembe, Ahmed Mohamed, Obadiah Ngigi, Gertrude Ogwok, Jules Roberts, and Sophie Kutegeka. "Using Inclusive Finance to Significantly Scale Climate Change Adaptation." In African Handbook of Climate Change Adaptation, 1–26. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42091-8_127-1.

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AbstractReversing land degradation and achieving ecosystem restoration and management are routes to climate change adaptation and mitigation. The financial resources to achieve this are increasingly available. A major challenge is the absence of scalable mechanisms that can incentivize rapid change for rural communities at the decade-long time scale needed to respond to the climate emergency. Despite moves toward inclusive green finance (IGF), a major structural gap remains between the funding available and the unbankable small-scale producers who are stewards of ecosystems. This paper reports on inclusive finance that can help fill this gap and incentivizes improved ecosystem stewardship, productivity, and wealth creation. A key feature is the concept of eco-credit to build ecosystem management and restorative behaviors into loan terms. Eco-credit provides an approach for overcoming income inequality within communities to enhance the community-level ecosystem governance and stewardship. The paper discusses the experience of implementing the Community Environment Conservation Fund (CECF) over a 8-year-period from 2012. The CECF addresses the unbankable 80% of community members who cannot access commercial loans, has c. 20,000 users in Uganda and pilots in Malawi, Kenya, and Tanzania. The model is contextualized alongside complementary mechanisms that can also incentivize improved ecosystem governance as well as engage and align communities, government, development partners, and the private sector. This complementary infrastructure includes commercial eco-credit as exemplified by the Climate Smart Lending Platform, and the community finance of the Village Savings and Loans Associations (VSLA) model upon which CECF builds. The paper describes the technologies and climate finance necessary for significant scale-up.

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Gupta, Indrani. "Financing for a Resilient Health System in India: Lessons from the COVID Pandemic." In Health Dimensions of COVID-19 in India and Beyond, 245–59. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7385-6_13.

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AbstractCOVID-19 has again brought into focus the need for building a resilient health system which can cater efficiently and equitably to the population during normal times as well as during unforeseen events like an epidemic, pandemic, or other unanticipated occurrences that impact human health. To be prepared well in advance means to avoid unnecessary morbidity and mortality on the one hand, and minimize socio-economic impact on individuals and households, on the other. The author argues that each component that goes into building a resilient health system requires financing, making health financing the key policy knob for the government. India has had to struggle in real time to fill the various gaps in the health system during the pandemic, by undertaking emergency investment on a variety of essential goods and services for the health sector. The analysis of trends in health financing indicates that government investment has remained very low which has prevented strengthening key areas of the health system like infrastructure, personnel, and medical supplies. It has also resulted in high out-of-pocket expenditures for health care by households, exacerbating inequalities in access. Finally, the latest budget outlays for health are examined to analyze whether India has been able to use the pandemic as a wake-up call for prioritizing the health sector and build a stronger health system.

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Leung, Kei Yan. "Reflections on Doing Cross-Cultural Research Through and with Visual Methods." In Co-Creativity and Engaged Scholarship, 265–97. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-84248-2_9.

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AbstractAs a traditional and dominant practice of qualitative research, interviewing is heavily dependent on meanings constructed by language. In a cross-cultural setting, the challenge of adequately capturing what interviewees want to convey is well acknowledged by researchers. Indeed, meanings are not only tied to linguistic meanings but also to cultural practices. Moreover, when the focus of one’s research is to understand the mindsets and practices of farmers, focusing solely on spoken words may also hide the fact that farmers also engage with plants, soil and nature through emotions and feelings. In this chapter I will reflect on my personal experiences as a non-Japanese Asian researcher working with an interpreter during my field work in Japan. In the interviews I conducted with farmers, I used photographs of local artwork to elicit information to understand what relationships they may build between the artworks and their farming practices. I used photo elicitation to supplement the limitations of language in making sense of meanings tied to farming practices. Also, to convey results to a western audience, I explore the use of visual illustrations to complement verbal quotes to more fully convey the meaning of the quotes. Two main observations emerged from this cross-cultural experience: first, the gap between language and cultural meaning can provide valuable opportunities for researchers to experiment with different methods, that broaden our sensibilities beyond rational reasoning in data collection; second, using photography in interviews can unfold different layers of realities than talk-only interviews. I argue that visual methods can take us beyond language and open up a more diverse picture to understand the practices of farmers. It is therefore important for cross-cultural researchers to be reflexive about the limitations of language, transform these challenges to an opportunity to remake method and open up different layers of understanding.

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Li, Tianxiang, Xiaosong Han, Aoqing Wang, Hui Li, Guosheng Liu, and Ying Pei. "News-Based Research on Forecast of International Natural Gas Price Trend." In Fuzzy Systems and Data Mining VI. IOS Press, 2020. http://dx.doi.org/10.3233/faia200699.

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In this paper, we build a deep learning network to predict the trends of natural gas prices. Given a time series, for each day, the gas price trend is classified as “up” and “down” according to the price compared to the last day. Meanwhile, we collect news articles as experimental materials from some natural gas related websites. Every article was then embedded into vectors by word2vec, weighted with its sentiment score, and labeled with corresponding day’s price trend. A CNN and LSTM fused network was then trained to predict price trend by these news vectors. Finally, the model’s predictive accuracy reached 62.3%, which outperformed most of other traditional classifiers.

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Magee, Patrick, and Mark Tooley. "Gas Supply and the Anaesthetic Machine." In The Physics, Clinical Measurement and Equipment of Anaesthetic Practice for the FRCA. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199595150.003.0026.

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In Europe and other advanced medical communities, medical gases are generally supplied by pipeline, with cylinders available as back up. Large hospitals usually have oxygen supplied and stored in liquid form, since one volume of it provides 840 volumes of gaseous oxygen at 15◦C. It is stored in a secure Vacuum Insulated Evaporator (VIE) on the hospital site. The arrangement is shown in Figure 22.1. The VIE consists of an insulated container, the inner layer of which is made of stainless steel, the outer of which is made of carbon steel. The liquid oxygen is stored in the inner container at about−160◦C (lower than the critical temperature of−118◦C) at a pressure of between 700 and 1200 kPa. There is a vapour withdrawal line at the top of the VIE, from which oxygen vapour can go via a restrictor to a superheater, where the gas is heated towards ambient temperature. Where demand exceeds supply from this route, there is also a liquid withdrawal line from the bottom of the VIE, from which liquid oxygen can be withdrawn; the liquid can be made to join the vapour line downstream of the restrictor and pass either through the superheater or back to the top of the VIE. The liquid can also be made to pass through an evaporator before joining the vapour line. After passing through the superheater, the oxygen vapour is passed through a series of pressure regulators to drop the pressure down to the distribution pipeline pressure of 410 kPa. It should be remembered that no insulation is perfect and there is a pressure relief valve on top of the VIE in case lack of demand and gradual temperature rise results in a pressure build up in the container. There is a filling port and there is usually considerable wastage in filling the VIE; the delivery hose needs to be cooled to below the critical temperature, using the tanker liquid oxygen itself to cool the delivery pipe. The whole VIE device is mounted on a hinged weighing scale and is situated outside the hospital building, protected by a caged enclosure, which also houses two banks of reserve cylinders.

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Monkiewicz, Jan. "Foreign Technology and National Technological Build-up." In International Technology Flows and the Technology Gap, 39–62. Routledge, 2019. http://dx.doi.org/10.4324/9780429033438-2.

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Hanif Mujawar, Tabbsum, P. Prabhkar, Vijendra Chaudhary, and Lalasaheb Deshmukh. "Design and Development of Air Quality Monitoring System for Solapur City Using Smart Technologies: WSN and IoT." In Environmental Management [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98755.

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Owing to enhancement in technology there is inclination in miniaturization of devices which demands to build up stumpy expensive sensor, least powered and hardy devices. Accordingly, Wireless Sensor Networks (WSN) has gained significance in diverse applications: Farming, household, industries and environmental monitoring. Wireless sensor network system worn to monitor and control the air quality of an environment is developed. The air pollution monitoring system that measures temperature, humidity, SPM (Suspended Particulate Matter), NOx and CO are proposed. The conventional air quality monitoring system, prescribed by the Pollution Control Department, is tremendously pricey. Analytical measuring paraphernalia is lavish, time and power overriding, and can seldom be used for air quality exposure in real time. Endeavor has been completed to develop state of art monitoring system using commercially available standard pollutant gas sensors incorporated into a mote. An exact program made with LabVIEW is formed to constitute the measurements of sensing used in the established network. Remote monitoring of the system is made possible using IoT.

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Conference papers on the topic "Gas build-up"

Saadi, Faisal Al, Karl-Heinz Wolf, and Cor Van Kruijsdijk. "Oil Bank Build Up: An Experimental Approach." In SPE EOR Conference at Oil and Gas West Asia. Society of Petroleum Engineers, 2018. http://dx.doi.org/10.2118/190331-ms.

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Ishkin, D. Z., R. I. Nuriev, A. Y. Davletbaev, R. R. Islamov, and G. F. Asalkhuzina. "Decline-Analysis/Short Build-up Welltest Analysis of Low Permeability Gas Reservoir." In SPE Russian Petroleum Technology Conference and Exhibition. Society of Petroleum Engineers, 2016. http://dx.doi.org/10.2118/181974-ms.

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Kumar, Vineet, Saurabh Kumar Vema, and Anil Kumar Bhatnagar. "Pressure Build up Study with Echo Meter Data - A Case Study of NE Field." In SPE Oil and Gas India Conference and Exhibition. Society of Petroleum Engineers, 2017. http://dx.doi.org/10.2118/185399-ms.

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Andreani, Michele. "Simulation of Gas Stratification Build-Up in the Containment Under Severe Accident Conditions." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-31141.

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The presence of hydrogen stratification in a NPP containment in the case of a severe accident is a source of concern, as pockets of the gas in high concentration could lead to a deflagration or detonation risk, which might challenge the containment structural integrity. These issues, as well as the capability of various computer codes to predict the evolution of a representative accident, are addressed in the coordinated projects ERCOSAM of the 7th EURATOM FWP and the project SAMARA sponsored by ROSATOM. The projects aim to establish whether in a test sequence representative of a severe accident in a LWR hydrogen stratification can be established during the initial transient following a loss of coolant accident (LOCA) and whether and how this stratification can be broken down by the operation of Severe Accident Management systems (SAMs): sprays, coolers and Passive Auto-catalytic Recombiners (PARs). Experiments with helium (as simulant of hydrogen) have been performed at “small scale” in TOSQAN (IRSN, Saclay), and “medium scale” in the MISTRA (CEA, Saclay), PANDA (PSI, Villigen) and SPOT ((JSC “Afrikantov OKBM”, Nizhny Novgorod) facilities. The present paper presents the analysis of the initial transient of some tests in the PANDA, TOSQAN and SPOT facilities using the GOTHIC computer code. The work therefore addresses the capability of the code and a relatively coarse mesh to simulate the pressurisation and build-up of steam and helium stratification for conditions representative of a postulated severe accident scenario, properly scaled to the various facilities. The prediction of the pressurisation is excellent, and the position of the gas concentration stratification front at the end of the steam and helium releases is generally well captured.

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Ishkin, D. Z., R. I. Nuriev, A. Y. Davletbaev, R. R. Islamov, and G. F. Asalkhuzina. "Decline-Analysis/Short Build-up Welltest Analysis of Low Permeability Gas Reservoir. (Russian)." In SPE Russian Petroleum Technology Conference and Exhibition. Society of Petroleum Engineers, 2016. http://dx.doi.org/10.2118/181974-ru.

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Zhang, Xiumei, Shubo Jiang, and Jialin Hu. "Power build-up cavity enhanced Raman spectroscopy based on piezoelectric transducer for gas analysis." In Second International Conference on Photonics and Optical Engineering, edited by Chunmin Zhang and Anand Asundi. SPIE, 2017. http://dx.doi.org/10.1117/12.2257870.

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Retuta, Maria, and Leiro Medina. "Systematic Build-Up Pressure Analysis Advances Accurate Fingerprinting of Formation Breathing in Gas Wells." In IADC/SPE Managed Pressure Drilling & Underbalanced Operations Conference & Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206397-ms.

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Abstract Differentiating wellbore breathing from real influxes in Alberta's Deep Basin has been problematic in the past as they both result in similar surface parameters. An incorrect interpretation of formation breathing may lead to significant non-productive time (NPT) as secondary well control operations from an influx can take days. On the contrary, a false negative will force drillers to perform secondary well control procedures that may lead to loss of circulation if excessive and unnecessary pressure is exerted on the formation. MPD allows for a systematic approach to identify wellbore breathing more accurately in gas wells. The process involves a series of consecutive pressure build-up and flowback tests with close real-time monitoring to identify a breathing formation that is returning fluid to surface as microfractures close. This paper describes the protocol designed for distinguishing wellbore breathing and illustrates how several drilling parameter trends were interpreted to correctly identify wellbore breathing characteristics and differentiate them from a migrating gas influx. Testing the procedure on multiple wells resulted in 70% operational time savings from reduction in post mud rollover delays on breathing wellbores. This paper shows that the methodology utilized provides consistent and effective results using the MPD techniques, eliminates the ambiguity of wellbore breathing versus actual influxes, and shows the potential application in more areas that are prone to this problem, reducing uncertainty, NPT, and total drilling time.

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Casari, Nicola, Michele Pinelli, and Alessio Suman. "On Deposition and Build-Up Detachment in Compressor Fouling." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76776.

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Compressor fouling is a severe problem for both heavy-duty and aero-propulsion gas turbines. Particles can impinge on the blade and annulus surfaces, sticking there. The consequences of particle deposition are the increase of the roughness and an uncontrolled variation in the surface shape. These problems have a major effect on the performance of the compressor over time. Variations in the flow field can make the flow quantities close to the deposit to change, and it may happen that the conditions for the sticking do not hold any longer. If this is the case, the build-up detachment may happen. This occurrence can mitigate the fouling effects and may be exploited for keeping the performance of the compressor as high as possible over the operating period. In this work, an innovative model is proposed in order to evaluate the adhesion forces and the possible detachment. Particularly, the same forces that keep a gecko stuck to a surface are considered: the van der Waals forces (due to the proximity of the two bodies) and the Laplace force (due to the curvature of the liquid film related to the humidity). The so formulated model, named gecko-like for such a reason, is used for the numerical analyses of a deposition problem. Both the sticking and possible build-up detachment are considered. The outcome of this work can be regarded as an a-priori estimate of the forces to be kept into account when dealing with compressor fouling problems.

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Othman, Haziqah Othman, Hongwen Zhao Zhao, Norshida Mohsin Mohsin, Rajput Seemant Singh, Salbiah Isa Isa, Awang Amirul Zakry Awang Bujang Awang Bujang, M. Anwar Ishak Ishak, et al. "Karst Mapping on Carbonate Build up Using Advanced Spectral Decomposition and Enhanced Variance Filter Technology at Offshore Malaysia." In SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210663-ms.

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Abstract Karstification is one of the major culprits for drilling issues (e.g., mud loss/blowout/wellbore collapse) in carbonate fields. Hence, it is crucial to precisely identify and predicate paleokarst distribution before formalizing a drilling plan. In this study, an isolated Miocene carbonate buildup in the offshore of Malaysia which is covered by a 3D marine seismic survey is selected for Karst mapping. Geological study shows that the carbonate buildup is bounded by two boundary faults and carbonate bodies were altered by multiple episodes of faulting and subaerial exposure related karstification. Extensive karstification is also evident by total mud losses in wells penetrating carbonate succession. Two in-house technologies: Advanced high-resolution Spectral Decomposition (ASD) and Hessian Filter-enhanced Variance (HFV) were used to illustrate the discontinuities within carbonate bodies and map Karst distribution. Well calibration with ASD and HFV results demonstrates that 1) Carbonate buildup can be clearly distinguished from surrounding clastics by specific (bright orange-colored) boundaries against dull colored clastics in RGB blending images; 2) Karst-related cavernous systems can be depicted by dendritic pattern variation in ASD images and HFV anomalies; 3) Linear discontinuities caused by fractures/faults are also highlighted by the results of ASD and HFV. It can be concluded that the combination of discontinuities revealed by ASD and HFV and with appropriate well and core calibration is a reliable way to predicate karstified reservoirs within the offshore carbonate buildup.

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Khosravi, V., and S. Ketabi. "Well Test Analysis of Gas Condensate Reservoirs from Pressure Build Up and Draw Down Tests." In Offshore Technology Conference-Asia. Offshore Technology Conference, 2014. http://dx.doi.org/10.4043/24897-ms.

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Reports on the topic "Gas build-up"

Connors, Caitlin, Melanie Cohen, Sam Saint-Warrens, Fan Sissoko, Francesca Allen, Harry Cerasale, Elina Halonen, Nicole Afonso Alves Calistri, and Claire Sheppard. Psychologies of Food Choice: Public views and experiences around meat and dairy consumption. Food Standards Agency, March 2022. http://dx.doi.org/10.46756/sci.fsa.zoc432.

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This report presents findings drawn from qualitative remote ethnography research with 24 UK participants conducted during July and August 2021, plus nine peer-to-peer interviews conducted by main sample participants with their friends and family. This research aimed to build on existing evidence in this area to fill gaps and provide an up-to-date snapshot of UK public experiences. Areas of focus included: Motivations for dietary choices Any gaps between consumer intention and behaviour Trade-offs and contextual differences (e.g. in vs. out-of home behaviours) The roles of specialist diets, substitution approaches, alternatives and ‘imitations’, locally/UK sourced meat and dairy, socio-demographics, culture and family Impact and role of food labelling and terminology The sample represented a range of variables including age, gender, nationality (England, Wales, Northern Ireland), urbanity/rurality, lifestage and household composition - and dietary profile (carnivore, ‘cutting down,’ vegetarian, vegan). This report was informed by an evidence review by the University of Bath on the factors underpinning the consumption of meat and dairy among the general public.

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Millington, Kerry A. Protecting and Promoting Systems for Essential Health Services During Rollout of COVID-19 Tools. Institute of Development Studies (IDS), May 2021. http://dx.doi.org/10.19088/k4d.2021.084.

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The COVID-19 pandemic has had a tremendous negative impact on economies of most countries around the world. COVID-19 has disrupted the ability of health systems to deliver on essential health services and has also exposed pre-existing vulnerabilities and inequities in public health systems. According to a key informant survey conducted by WHO, over one year into the COVID-19 pandemic, there still exist substantial disruptions to essential health services. This rapid review examines evidence on successful interventions that could enable adaptive approaches to help manage and respond future pandemics and mitigate the risk of collapse of the public health systems. Countries must use the opportunity provided by the deployment of COVID-19 vaccines to strengthen health services and health systems and find long-lasting solutions for similar future challenges. The review notes that there still exist gaps in preparedness and response to the Covid-19 pandemic. New variants of concern threaten the effectiveness of existing COVID-19 vaccines, vaccine hesitancy slowing rollout, including in Africa, and interrupted and limited supply of COVID-19 tools. More funding is required though to scale up adaptive measures which are working, accelerating new approaches and innovations to improve service delivery. This review also highlights briefly the plight of marginalised social groups, people living with disabilities, women and children during the pandemic. According to estimates by Global Fund, Gavi, Global Financing Facility, access to life-saving health interventions for women, children and adolescents in 36 of the world’s poorest countries has dropped by as much as 25% due to COVID-19. Countries must build on the momentum of health innovations during the COVID-19 crisis to build more resilient health systems that can withstand disruptions by future pandemics.

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Morin, Shai, Gregory Walker, Linda Walling, and Asaph Aharoni. Identifying Arabidopsis thaliana Defense Genes to Phloem-feeding Insects. United States Department of Agriculture, February 2013. http://dx.doi.org/10.32747/2013.7699836.bard.

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The whitefly (Bemisia tabaci) is a serious agricultural pest that afflicts a wide variety of ornamental and vegetable crop species. To enable survival on a great diversity of host plants, whiteflies must have the ability to avoid or detoxify numerous different plant defensive chemicals. Such toxins include a group of insect-deterrent molecules called glucosinolates (GSs), which also provide the pungent taste of Brassica vegetables such as radish and cabbage. In our BARD grant, we used the whitefly B. tabaci and Arabidopsis (a Brassica plant model) defense mutants and transgenic lines, to gain comprehensive understanding both on plant defense pathways against whiteflies and whitefly defense strategies against plants. Our major focus was on GSs. We produced transgenic Arabidopsis plants accumulating high levels of GSs. At the first step, we examined how exposure to high levels of GSs affects decision making and performance of whiteflies when provided plants with normal levels or high levels of GSs. Our major conclusions can be divided into three: (I) exposure to plants accumulating high levels of GSs, negatively affected the performance of both whitefly adult females and immature; (II) whitefly adult females are likely to be capable of sensing different levels of GSs in their host plants and are able to choose, for oviposition, the host plant on which their offspring survive and develop better (preference-performance relationship); (III) the dual presence of plants with normal levels and high levels of GSs, confused whitefly adult females, and led to difficulties in making a choice between the different host plants. These findings have an applicative perspective. Whiteflies are known as a serious pest of Brassica cropping systems. If the differences found here on adjacent small plants translate to field situations, intercropping with closely-related Brassica cultivars could negatively influence whitefly population build-up. At the second step, we characterized the defensive mechanisms whiteflies use to detoxify GSs and other plant toxins. We identified five detoxification genes, which can be considered as putative "key" general induced detoxifiers because their expression-levels responded to several unrelated plant toxic compounds. This knowledge is currently used (using new funding) to develop a new technology that will allow the production of pestresistant crops capable of protecting themselves from whiteflies by silencing insect detoxification genes without which successful host utilization can not occur. Finally, we made an effort to identify defense genes that deter whitefly performance, by infesting with whiteflies, wild-type and defense mutated Arabidopsis plants. The infested plants were used to construct deep-sequencing expression libraries. The 30- 50 million sequence reads per library, provide an unbiased and quantitative assessment of gene expression and contain sequences from both Arabidopsis and whiteflies. Therefore, the libraries give us sequence data that can be mined for both the plant and insect gene expression responses. An intensive analysis of these datasets is underway. We also conducted electrical penetration graph (EPG) recordings of whiteflies feeding on Arabidopsis wild-type and defense mutant plants in order to determine the time-point and feeding behavior in which plant-defense genes are expressed. We are in the process of analyzing the recordings and calculating 125 feeding behavior parameters for each whitefly. From the analyses conducted so far we conclude that the Arabidopsis defense mutants do not affect adult feeding behavior in the same manner that they affect immatures development. Analysis of the immatures feeding behavior is not yet completed, but if it shows the same disconnect between feeding behavior data and developmental rate data, we would conclude that the differences in the defense mutants are due to a qualitative effect based on the chemical constituency of the phloem sap.

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Ruisi-Besares, Pia, Matthias Sirch, Alyx Belisle, James Duncan, Josephine Robertson, Jennifer Pontius, Danielle Cook, and Elissa Schuett. Technical Report on Assembling Indicators to Monitor Climate-Driven Change in Northeastern Forests. Forest Ecosystem Monitoring Cooperative, September 2021. http://dx.doi.org/10.18125/99o4tq.

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Forest ecosystems are experiencing the impacts of climate change in many forms, however, comprehensive monitoring efforts are not always available to identify changing baselines. In order to improve our understanding of the impacts of climate change on ecosystem processes, the FEMC developed the Forest Impacts of Climate Change: Monitoring Indicators tool (Version 1.0). The Forest Impacts of Climate Change: Monitoring Indicators tool was developed for use by researchers and professionals to be able to easily access protocols used to monitor high priority indicators of the impacts of climate change in New England and New York. The monitoring protocols provide information for landowners and managers to implement their own monitoring programs that will be comparable to other studies being conducted across the region. By centralizing information about this network of monitoring sites, more data will become available to the community to help discern how forest ecosystems are changing. This report describes the methods and implementation used to build this tool. To develop the Forest Impacts of Climate Change: Monitoring Indicators tool, FEMC formed a committee of partners to select indicators and provide guidance about the literature review and eventual tool. The committee identified four ecological categories as important for monitoring climate change in the Northeast: Wildlife, Forest Systems, Trees, and Aquatic Systems. FEMC identified who is currently conducting monitoring efforts, what monitoring protocols are available for replication, gaps in monitoring data, and how we can make data and monitoring information easily available so that land managers can have the most up-to -date information possible. The developed tool compiles over 350 studies across 24 different indicators of the impacts of climate change. Through a filterable webtool users can find these studies, as well as 168 replicable protocols to direct implementation. The tool helps to identify gaps in monitoring efforts and provides a platform for users to contribute to regionally cohesive datasets. Monitoring of indicators across systems is critical for tracking and understanding climate change impacts. The Forest Impacts of Climate Change: Monitoring Indicators tool, developed for use by researchers, professionals, and land managers across the region, lets users find methods and protocols for monitoring climate change impacts and see where these monitoring efforts are already being conducted in our region. In addition, you can quickly visualize where there are gaps in our monitoring. As contributors in the Cooperative region share more information about their own monitoring efforts, this will become available to the community through this tool, increasing our ability to track and identify change in our forested ecosystems.

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Academic literature on the topic 'Gas build-up'

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Journal articles on the topic "Gas build-up"

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Books on the topic "Gas build-up"

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Conference papers on the topic "Gas build-up"

Reports on the topic "Gas build-up"