Bibliografie tematiche / Foced proximity

Letteratura scientifica selezionata sul tema "Foced proximity"

Autore: Grafiati
Pubblicato: 26 luglio 2024
Ultima modifica: 27 luglio 2024

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Articoli di riviste sul tema "Foced proximity"

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Jacob, Céline, Nicolas Guéguen e Gaëlle Boulbry. "Geographic Proximity of Products and Preference: A Forced-Choice Evaluation". Journal of Food Products Marketing 23, n. 6 (7 giugno 2016): 717–22. http://dx.doi.org/10.1080/10454446.2015.1121423.

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Koizumi, Naoki, e Takayuki Ishida. "Forced proximity of nitroxide groups in pincer compounds with a xanthene spacer". Tetrahedron Letters 58, n. 29 (luglio 2017): 2804–8. http://dx.doi.org/10.1016/j.tetlet.2017.06.004.

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Zhang, M., e G. Bergmann. "Forced localization in thin K films, investigated with the superconducting proximity effect". Europhysics Letters (EPL) 69, n. 3 (febbraio 2005): 442–46. http://dx.doi.org/10.1209/epl/i2004-10349-4.

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Alam, Ayesha, Faiza Anum, Khajista Jabeen, Zeeshan Javed, Saira Khan, Shoaib Kabir e Shahid Raza. "Proximate Approaches and Dietetic Comparison of Bt and Non Bt (Basmati) Rice Samples". Lahore Garrison University Journal of Life Sciences 3, n. 2 (22 aprile 2020): 79–85. http://dx.doi.org/10.54692/lgujls.2019.030258.

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Trend of GM crops has drastically amplified since couple of years. Global production status has shown that over 52 million ha in urban areas is comprised of GM crops. Apart from economic importance and future demands, there is a huge concern regarding nutritional content of genetically engineered plants. Amongst all, Bt rice is well-known as a domestic cereal and its increased demand has forced to enhance the rice production. Pest attack has reduced rice production that is why Bacillus thuringiensis variety of rice has been introduced. The current research has been conducted to equate dietetic measures of Non Bt basmati with Bt variety that both are cultivated in Pakistan’s agricultural land. Proposed protocol for proximate analysis was AOAC method where statistically analyzed studied parameters (fat, fiber, ash, protein, moisture) illustrated HO is less than P value that proposed minor alterations in proximate configuration of both rice varieties such as (fat 2.90%, fiber 2.20%, ash 3.10%, protein 9.20%, moisture 10.80%) in Bt Rice While (fat 2.65%, fiber 2.40%, ash 2.80%, protein 9.30%, moisture 11%) in Non Bt Rice. Visible difference was found in result of elemental analysis of two varieties. Elemental content such as Ca 0.013, Mg 023, were less in Bt rice in contrast to Basmati (non Bt) rice. During the present study it was concluded that foreign gene insertion cannot affect proximity of variety but it can change elemental content of rice variety.
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Mohsenzadeh, Afshin, Mousa Farhadi e Kurosh Sedighi. "Convective cooling of tandem heated triangular cylinders placed in a channel". Thermal Science 14, n. 1 (2010): 183–97. http://dx.doi.org/10.2298/tsci1001183m.

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Numerical simulations of forced convective incompressible flow in a horizontal plane channel with adiabatic walls over two isothermal tandem triangular cylinders of equal size are presented to investigate the effect of wall proximity of obstacles, gap space (i.e. gap between two squares), and Reynolds number. Computations have been carried out for Reynolds numbers of (based on triangle width) 100, 250, and 350. Results show that, wall proximity has different effect on first and second triangle in fluid characteristics especially in lower gap spaced, while for heat transfer a fairly same behavior was seen.
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Hoh, Nicholas J., e Roseanna N. Zia. "The impact of probe size on measurements of diffusion in active microrheology". Lab on a Chip 16, n. 16 (2016): 3114–29. http://dx.doi.org/10.1039/c6lc00476h.

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A framework to study the influence of polydispersity on flow-induced diffusion in active microrheology is presented. It is found that diffusive behavior is set entirely and dually by the proximity with which two particles can approach one another, and by the extent to which this minimum approach distance is occupied by the hydrodynamic size of the forced particle.
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McNeilly, Hannah, e Koreen M. Reece. "‘Everybody’s Always Here with Me!’". Anthropology in Action 27, n. 3 (1 dicembre 2020): 18–21. http://dx.doi.org/10.3167/aia.2020.270304.

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Social distancing has been the central public health strategy for tackling the coronavirus pandemic worldwide. But the ‘Stay Home, Stay Safe’ order in the United Kingdom and the consequent closure of nurseries and schools also created an unprecedented degree of proximity within households. Based on interviews with mothers of young children in Scotland, this article provides early insight into the ways that mothers manage the forced intimacies of family life under lockdown and the opportunities they create through the innovative management of space and time. The result is a more expansive understanding of the family in contemporary Scotland and a notion of intimacy characterised as much by the necessity of distance and distinction as by proximity and mutuality.
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Lu, Cian-Tong, Zhi-Yan Zhu, Sheng-Wen Chen, Yu-Ling Chang e Kan-Lin Hsueh. "Effects of Cell Design Parameters on Zinc-Air Battery Performance". Batteries 8, n. 8 (15 agosto 2022): 92. http://dx.doi.org/10.3390/batteries8080092.

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Zn-air batteries have attracted considerable attention from researchers owing to their high theoretical energy density and the abundance of zinc on Earth. The modification of battery component materials represent a common approach to improve battery performance. The effects of cell design on cell performance are seldom investigated. In this study, we designed four battery structures as follows. Cell 1: close-proximity electrode, Cell 2: equal-area electrode, Cell 3: large zinc electrode, and Cell 4: air channel flow. The effects of four factors: (1) carbon paste, (2) natural and forced air convection, (3) anode/cathode area ratio, and (4) anode–cathode distance were also investigated. Results showed that the addition of carbon paste on the air side of 25BC increased cell power density under forced air convection. Moreover, cell performance also improved by increasing the anode/cathode ratio and by decreasing the anode–cathode distance. These four types of cells were compared based on the oxygen reduction reaction electrode area. Cell 3 displayed the highest power density. In terms of volumetric power density, the proximity cell (Cell 1) exhibited the highest power density among the cells. Therefore, this cell configuration may be suitable for portable applications.
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Spratt, Robbie. "Intimacy as Transparency". Columbia Journal of Literary Criticism 18, n. 1 (7 ottobre 2021): 38–42. http://dx.doi.org/10.52214/cjlc.v18i1.8767.

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In this essay, I use the term “intimacy” to refer to a sentiment of emotional proximity between two or more people. For queer theorist Lauren Berlant, intimacy principally “involves an aspiration for a narrative about something shared, a story about both oneself and others that will turn out a particular way” (281). At its core, an intimate practice is one that allows individuals to share themselves, to know each other more closely, and to work towards a narrative together. In the French society of the 1990s, the dominant heteronormative narrative deemed marriage and sex the most intimate acts largely for their procreative potential, as they produced the ideal emotional proximity and contained this proximity to the perfect nuclear family. In turn, as Berlant notes, queers are forced to find alternative methods of being intimate, whether it be their own non-procreative sex or emotionally invested practices that disavow sex completely. Although sex is heavily present within the work explored in this essay, it becomes clear that queer intimacy does not simply turn straight sex on its head by virtue of having gay participants, but rather that queer intimacy can hold a more subversive role by hinging on sexual objectification and producing emotional proximity on a larger, communal level.
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Farhadi, Mousa, Kurosh Sedighi e Afshin Mohsenzadeh Korayem. "Effect of wall proximity on forced convection in a plane channel with a built-in triangular cylinder". International Journal of Thermal Sciences 49, n. 6 (giugno 2010): 1010–18. http://dx.doi.org/10.1016/j.ijthermalsci.2009.12.013.

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Libri sul tema "Foced proximity"

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Rivers, Greer, My Brother's Editor e Cover Me Darling. Healing Conviction: A Forced Proximity Romantic Suspense. Blue Ghost Publishing, LLC, 2021.

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Rivers, Greer, My Brother's Editor e Cover Me Darling. Healing Conviction: A Forced Proximity Romantic Suspense. Blue Ghost Publishing, LLC, 2021.

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Lured: An Arranged Marriage Forced Proximity Romance. Crave Publishing, 2023.

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NEY, SARA. The Player Hater: A Forced Proximity Standalone. Independently published, 2022.

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Winging It: A Forced Proximity Travel Romance. NB Creative, 2024.

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Lacoy, Dakota. My Daring Texan: A Forced Proximity Romance. Pressing Matters Publishing Co., Inc., 2023.

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Sharp, Jillian. Uncharted Desires: A Forced Proximity, Rockstar Romance. Peace, Love & Read Publishing, 2024.

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Healing Conviction: A Forced Proximity Romantic Suspense. Blue Ghost Publishing, LLC, 2021.

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Lacoy, Dakota. My Daring Texan: A Forced Proximity Romance. Pressing Matters Publishing Co., Inc., 2023.

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Sacrifice: A Dark Revenge Romance. Tessier, Shantel, 2023.

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Capitoli di libri sul tema "Foced proximity"

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Geropanta, Vasiliki, e Riccardo Porreca. "The Concept of Proximity in Post-pandemic Architectural Thinking: 15-Minute City and Superblocks". In COVID-19 (Forced) Innovations, 23–37. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-56607-3_3.

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Carron, Djemila, e Paul O’Keeffe. "Education Can’t Wait for LGBTIQ Refugees? Exploring Inclusion and Access to Higher Education in Kakuma Refugee Camp". In Migration, Displacement, and Higher Education, 75–85. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-12350-4_6.

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AbstractHigher education in refugee contexts has, in recent years, emerged as a key humanitarian response and development imperative within the international forced migration management space (ECRE 2016). Humanitarian organizations and authorities active in the global forced migration management system have, to varying degrees, instituted and facilitated access to higher education opportunities for many refugees within the confines of refugee camps or the close proximity of host communities (Ferede 2018). Under the broad, sometimes vague, guidance of global development initiatives such as the sustainable development goals (Sawadogo 2016), the raison d’etre of higher education has been positioned as an enabling tool for the economic, social and emotional empowerment of refugees (Brugha and Hollow 2017).
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Aleksanyan, Anna. "The Victims of “Safety”: The Destiny of Armenian Women and Girls Who Were Not Deported from Trabzon". In Documenting the Armenian Genocide, 23–37. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-36753-3_3.

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AbstractGiven its proximity to the Russian border, the city of Trabzon was a strategic port for the Young Turk government against the backdrop of war with Russia. While there is an extensive body of literature about Trabzon during the Armenian Genocide, the experiences of Armenian women and girls who stayed in the city remain unexamined. This chapter draws on the Trabzon trials and survivor testimonies to explore their experiences.While Trabzon Armenians received an official order of deportation, on June 26, 1915, the Vali Cemal Azmi made an “exemption” for Armenian women in later stages of pregnancy and for children “when the parents so desired.” Girls up to 15 years old and boys up to 10 years old remained and were placed in large houses throughout the city. After four years, all male children disappeared, and the girls who survived mostly did so in Turkish households to which they were given as gifts or sold to serve as a wives, servants, or sex slaves.In 1919, the Turkish Courts-Martial brought the perpetrators of the Armenian Genocide to trial in Constantinople. Cemal Azmi, Yenibahçeli Nail, who was the Committee on Union and Progress secretary for Trabzon, and five officials who worked with him stood before the court. The charges against them included organizing and implementing the massive annihilation of the Trabzon Armenians, the plunder of their property, the rape and murder of women and children, and the drowning of around 50 pregnant women in the Black sea. There were 20 sessions of the Trabzon trial, held between March 26 and May 20, 1919, during which witnesses and survivors testified. Among them were Misses Siranush Manukian, Philomene Nurian, Sofia Makhokhian, Aruseak Gylchian, Miss Arabian, and other women who witnessed mass drownings, were survivors of rape, forced marriages, and forced prostitution. The trial was extensively covered by both the Armenian and the Turkish press, whose representatives were present at the daily hearings. Close examination of these women's testimonies and other shreds of evidence of this trial shows how gendered the Armenian genocide was and how women were targeted for both their gender and national identity.
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Sufrin, Carolyn. "Custody as Forced and Enforced Intimacy". In Jailcare. University of California Press, 2017. http://dx.doi.org/10.1525/california/9780520288669.003.0008.

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This chapter explores the phenomenon of “pastoral custody,” where safety could be achieved through a knotty entanglement of control and benevolence. It discusses Foucault's description of pastoral power, which creates the simultaneous intimacy of custody and care in jail. This form of custody acknowledges the many contradictory tasks and affects of facilitating the minutiae of inmates' daily existence. The collective space of the jail and the deputies' job description result in close and constant spatial proximity, as well as intimacy around personal bodily processes and social interactions. The job of custody, then, requires both forced and enforced intimacy generated by the jail's conditions.
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Sharratt, Michael. "Theology and Philosophy at the English College, Douai: A Handlist of Sources". In History of Universities, 197–225. Oxford University PressOxford, 2003. http://dx.doi.org/10.1093/oso/9780199265657.003.0005.

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Abstract The English College was founded at Douai in the Spanish Netherlands in 1568, principally to prepare Roman Catholic men to work as priests in the hostile England and Wales of Elizabeth I. Douai was chosen because of its proximity to England and because it had a university which was founded in 1562. Apart from a temporary relocation to Rheims (1578-94), the College found the Spanish Netherlands a congenial haven. When Douai was brought under French rule in 1667, there was no interruption in the College’s work. French hospitality lasted until Britain and France went to war in the aftermath of the French Revolution. After its forced closure, the work of the College continued in England.
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"Minhag and Migration: Yiddish Custom Books from Sixteenth-Century Italy". In Regional Identities and Cultures of Medieval Jews, a cura di Lucia Raspe, 241–60. Liverpool University Press, 2018. http://dx.doi.org/10.3828/liverpool/9781906764678.003.0012.

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This chapter recounts the migration of German Jews to Italy that can be traced to the final decades of the fourteenth century. It explains how the Jews were expelled from almost all of the German cities and many principalities and came to a close with the warfare that ravaged northern Italy in the early 1500s. It also describes the Ashkenazi Jews who became a presence in numerous places that had not had a Jewish settlement, before settling at first in the towns and hamlets of the Friuli and the Venetian mainland, then moving on towards the Po valley. The chapter talks about the southward migration of Ashkenazi Jews that converged with a wave of indigenous Italian Jews moving north from Rome. It cites the ghettoization in the sixteenth century in Venice that forced Jews of all backgrounds into close proximity with one another.
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Vang, Chia Youyee. "Long Cheng Air". In Fly Until You Die, 73–97. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190622145.003.0005.

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Chapter 4 details Hmong experiences in combat aviation in the Secret War. It examines the dangerous flying conditions they faced in northern Laos, where, in addition to enemy antiaircraft artillery, freak accidents claimed the lives of some pilots. Poor quality aircraft, a hazardous runway, problematic leadership at all levels, and varied skills resulted in low chances for survival for Hmong pilots. Because of their close proximity to enemy territories, pilots on active duty from 1968 to 1972 were forced to participate in combat missions daily. The chapter also presents the many problems that unfolded in the CIA’s secret city, Long Cheng. Whereas American airmen came and went on tours of duty, Hmong pilots flew until they were either killed in action or injured. Either outcome harmed their families. Injured pilots were no longer considered useful, resulting in military leaders cutting them off financially and socially.
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Fields-Black, Edda L. "Stolen Children". In Combee, 53–66. Oxford University PressNew York, 2024. http://dx.doi.org/10.1093/oso/9780197552797.003.0003.

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Abstract This chapter talks about tobacco farmer Atthow Pattison’s bequeathment of Rit Green, Harriet Tubman’s mother, to his granddaughter, Mary Pattison after his death. It explores the typical norm of the time wherein wealthy white Southern girls and women inherit enslaved people who would take care of them, their children, and their homes and would help them maintain the proper station of a lady. It also analyzes Atthow’s motivation to limit Rit Green’s servitude by the Act of 1790, which allowed manumission of enslaved people under age 50 by deed or will. The chapter recounts the “abroad marriage” of Tubman’s parents as they were enslaved by two different slaveholders, which eventually ended in separation as Rit’s slaveholder decided to move away. It points out Tubman’s refusal to learn how to weave and to be forced to live and work in close proximity with white folks as her first acts of rebellion.
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Samuels, Richard J. "Driving Intelligence". In Special Duty, 1–31. Cornell University Press, 2019. http://dx.doi.org/10.7591/cornell/9781501741586.003.0001.

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This chapter identifies three generic drivers that affect the shape, pace, and direction of intelligence reform. The first consists of shifts in the strategic environment and the second driver of intelligence reform is technological change. Failure is the third, and often the most proximate, driver of intelligence reform. These three drivers forced the pace of intelligence reform in Japan in much the same way that they compelled reform elsewhere. This chapter observes how the drivers converge with the specific activities in which national intelligence communities are engaged—the “elements” of intelligence. It provides the historical and comparative framework for a subsequent analysis of the Japanese intelligence community.
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Hass, Jeffrey K. "Ties That Bind". In Wartime Suffering and Survival, 89–130. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197514276.003.0004.

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Starvation impacted not only political authority. It also severely shocked intimate relations and fields of meaning. In such duress, stealing food and other innovations and violations of norms became growing temptations—yet whether one carried out such strategies depended in part on social distance and empathy vis-à-vis those who might benefit and might suffer. Theft from organizations was easier than stealing from strangers, which was easier than stealing from an acquaintance. Symbolic distance also shaped survival practices, especially as Leningraders were forced to reclassify “food.” Proximity of nontraditional to traditional forms of food shaped culinary innovations. Inanimate objects (e.g., glue) were easier to reclassify as food than animals, and Leningraders ate horses more easily than cats. The most problematic innovation was cannibalism, a recurring narrative touchstone. Paradoxically, cannibalism could corrode and support norms: its appearance created dread of a new unhuman normality, but it also invoked condemnation and reinforced the importance of “civilization.”
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Atti di convegni sul tema "Foced proximity"

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Yin, Decao, Jie Wu, Elizabeth Passano, Halvor Lie, Ralf Peek, Octavio E. Sequeiros, Sze Yu Ang, Chiara A. Bernardo e Meliza Atienza. "In-Line VIV Based on Forced-Vibration Tests". In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95972.

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Abstract Excitation and added mass functions determined from forced vibration tests of a rigid cylinder undergoing harmonic motion in the flow are used in the semi-empirical software VIVANA to predict the VIV response of pipelines. An advantage of this approach, as opposed to the more-commonly-used response function approach, is that it can account for changing conditions along the length of the pipe, like changing current velocity, seabed proximity, and/or pipe diameter. This makes it useful for pipelines as well as for risers when such changes occur. Further, for pipelines, travelling wave effects play less of a role than for risers, so the VIVANA approach can be simplified by assuming the phase angle of the harmonic response is constant along the span. The interactions between cross-flow and in-line response that complicate the prediction of cross-flow VIV by the excitation function approach, do not arise for pure inline VIV. For the latter case, using the pure in-line forced vibration test data of Aronsen (2007), it is found that both VIVANA approach and simplified ‘SIVANA’ approach thereof predict VIV amplitudes consistent with experiments on flexible pipe (Ormen Lange umbilical VIV tests), and the DNVGL-RP-F105 response function for a range of structural and soil damping values. In a companion paper, this approach is applied partially strake-covered pipeline spans, to show that a relatively small fraction of well-placed strake coverage is enough to suppress in-line VIV.
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Milne, Ian A., e J. Michael R. Graham. "Vortex Shedding From Hulls in Close Proximity With Relative Motion". In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77151.

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The safe and efficient offloading of liquid natural gas (LNG) in a side-by-side configuration has emphasised the need to accurately quantify the hydrodynamic responses of floating bodies when located in very close proximity. A new series of computational results are presented for the forced roll of a hull in the presence of a second body representative of a floating FLNG facility. The vortex shedding phenomenon which provides a significant contribution to the damping of an isolated hull, is demonstrated to be modified by the presence of the second body. The total damping coefficients were found to be significantly reduced by approximately 50 percent for the very small gap widths considered. It is shown that in addition to the modification of the local shedding dynamics, the variation in the pressure field owing to the presence of the second body also contributes significantly to the reduction in the damping. The findings will be of particular interest to the offshore industry for improving and optimising offloading practices.
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Fleischer, Amy S., e Randy D. Weinstein. "An Experimental Investigation of the Thermal Interaction of Electro-Optical Components on a Printed Circuit Board in Natural and Forced Convection". In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47376.

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The thermal interaction of an electrical and an optical component located on the same vertical circuit board is studied experimentally. The effects of component proximity and convective flow rate on overall power dissipation from each component are analyzed. The components are represented by isothermal heat sources mounted to a standard 1.59mm (0.0625 in) thick FR4 circuit board. In natural convection situations, when the spacing between components is great enough that the component thermal footprints do not interfere, the power dissipation reaches a maximum “plateau” value that is independent of spacing. If the components are located close enough together that their thermal footprints interfere then the total power dissipation is highly dependent on component spacing (relative location of the electrical source and the geometric positioning of both sources). In forced convection, the total power dissipated increases with both Reynolds number and component spacing. As in natural convection, the relative location of the electrical sources and the positioning of the sources are found to have a strong influence on power dissipation.
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Emerson, Benjamin, Kelvin Murphy e Tim Lieuwen. "Flame Density Ratio Effects on Vortex Dynamics of Harmonically Excited Bluff Body Stabilized Flames". In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94284.

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This paper presents an experimental study of acoustically forced bluff body stabilized flames, motivated by the problem of combustion instabilities. The goal of the work is to better understand the flame and flow behavior as functions of the proximity of the acoustic frequency to natural hydrodynamic instability frequencies. It is well known that iso-density, high Re bluff body wakes are globally unstable, exhibiting the Von Karman vortex street. In reacting flows, however, this global mode is suppressed if the density ratio across the flame is sufficiently high. Thus, the density ratio is an important parameter that influences the global mode growthrate. In this study, the flame was longitudinally forced over a range of hydrodynamic global mode to forcing frequency ratios, density ratios, and forcing amplitudes. Longitudinal forcing leads to the symmetric rollup of the two separating shear layers. When the forcing frequency is in the vicinity of the wake’s global mode frequency, the global mode locks into the forcing frequency, and the symmetric shear layers quickly stagger as they convect downstream, leading to a large scale, sinuous flapping of the wake and flame. The axial position at which staggering occurs is a function of the forcing amplitude and the proximity of the forcing frequency to the global mode frequency. The lock-in phenomenon amplifies the flame’s motion at the forcing frequency. However, if the vortices stagger to a fully sinuous structure, this causes a significant reduction in the flame’s oscillatory heat release through phase cancellation of the upper and lower flame branches. Therefore, if a low density ratio flame is subjected to longitudinal acoustic forcing near its global mode frequency, it will respond with weaker heat release fluctuations than it would away from lock-in. This is true even though the local degree of flame flapping is quite significant. Thus, the results of this study show some phenomena that contradict conventional notions, namely that forcing a globally unstable flow near its global mode frequencies can lead to diminished local heat release oscillations.
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Ravinthrakumar, Senthuran, Babak Ommani, Trygve Kristiansen, Idunn Olimb e Bernt Karsten Lyngvær. "A Physical-Based Damping Model of Gap and Moonpool Resonance in WAMIT". In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-79673.

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Abstract An engineering model to estimate and incorporate quadratic damping of the piston-mode moonpool responses in the proximity of the piston mode period is proposed. The model provides a physical-based equivalent linearized damping coefficient. The method is not limited to forced motion, but applicable to freely floating moonpool vessels. Further, it is not limited to moonopools, but can be generalized to gap resonance problems, such as side-by-side operations. The soundness of the proposed physical-based method is demonstrated using the panel code WAMIT with a linear damping term in the free-surface boundary condition inside the moonpool using two existing moonpool experiments as case studies; (1) a two-dimensional rectangular box with a moonpool subject to forced heave, and (2) a freely floating offshore vessel in incident waves. The WAMIT computations using the proposed method reconstructs the experimentally obtained piston-mode and vessel responses well. We suggest that the proposed method can be used with fair degree of confidence in an early design or operational analysis phase, in the (often) case that the quadratic damping is not known from either experiments or CFD. To our knowledge, this is the first general, physical-based piston-mode damping model that does not require any tuning from experiments.
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Mitra, Mainak, Stefano Zucca e Bogdan I. Epureanu. "Effects of Contact Mistuning on Shrouded Blisk Dynamics". In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57812.

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Abstract (sommario):
Mistuning commonly refers to non-cyclically symmetric variations in such an otherwise cyclically-symmetric structure. Mistuning in a blisk due to variations in blade materials and geometry have been studied extensively and are known to have a significant impact on the forced response of blisks. However, mistuning can also arise due to variations at contact interfaces within a blisk with friction damping mechanisms such as under platform dampers or shrouds. Past literature analyzing the effect of this source of contact mistuning is limited, particularly by the use of lumped or single-node contacts at each sector to shorten analysis times. In this paper, we aim to better understand the specific effects of parameter variations across contact interfaces on an otherwise tuned blisk. A blisk with shroud to shroud contacts is considered. Accurate representation of microslip phenomena are incorporated in the analysis by modeling multiple localized node to node contact models at contact surfaces on each blisk sector. Contact stiffnesses which dictate the friction damping dynamics of the shrouds are chosen as the mistuning parameters. The harmonic balance method is used to solve for forced responses. We analyze cases with random patterns of contact stiffnesses in different microslip regimes in the proximity of different modal regions. Probabilistic analysis of nonlinear contact responses are carried out close to a linear region where comparatively high amplification factors are observed. Statistics are also developed for linear cases and compared with the nonlinear case to qualify the dependence of amplification factors of nonlinear forced responses on the level of microslip and on the variance of contact parameters.
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7

Hegde, Shreyas, Andrew Madden e Robert Kielb. "Influence of Disc Modes and Sideband Excitations on the Mistuned Forced Response Behaviour of an Embedded Compressor Rotor". In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-58780.

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Abstract This paper focusses on predicting the mistuned forced response behavior of an embedded compressor rotor blade row in a 3.5 stage axial compressor. The authors in previous papers studied the multi-row influence on the forcing function for multiple operating conditions. For these investigations CFX was utilized to predict the forcing However, in the mistuned predictions a consistent underprediction of the amplification factor was noted A previous investigation by the authors [32] considered an isolated mode family. The current work considers the same configuration but looks at a non-isolated mode family which is in a frequency “veering” region. Also, since the mistuning code was formulated on the lines of the fundamental mistuning model (FMM) the model only included a single DOF per ND and hence modes in the veering region were not modeled. The current paper addresses both these shortcomings and talks about the influence of sideband travelling wave excitations at the HL operating condition (the details of the mistuned predictions at the PE operating condition can be found in [32]). The paper also talks in detail about the effect of modelling the disc modes individually using the FMM model as well as together using the component mistuning model (CMM) as present in ANSYS Mechanical. Key conclusions are: 1) The mistuned response tends to be amplified by all cases including the sideband excitations, 2) The coupled influence of including a disc mode in the FMM model and sideband excitations is dependent on the proximity of the mode to the blade alone frequency, 3) Although the CMM model predicts the peak of the response accurately, it does not offer any substantial advantage over the FMM model given the computational cost required for the CMM prediction. Also, the prediction is highly sensitive to the frequency of the individual modes that can differ between codes.
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8

Nakamura, Hajime. "Cooling Fan Model for Thermal Design of Compact Electronic Equipment: Improvement of Modeling Using PQ Curve". In ASME 2009 InterPACK Conference collocated with the ASME 2009 Summer Heat Transfer Conference and the ASME 2009 3rd International Conference on Energy Sustainability. ASMEDC, 2009. http://dx.doi.org/10.1115/interpack2009-89010.

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In order to hasten the thermal design for forced convection electronic devices, cooling fans should be modeled to reduce a computational load. A fan-curve-model, which generates volumetric flow rate versus the characteristics pressure difference of a fan, is very simple and usually incorporated into commercial CFD codes. However, this model often results in an erroneous flow rate. In this work, both the experiments and the CFD simulation were performed around small axial-flow-fans of 30 and 40 mm in diameter. The measured PQ curve was applied to the fan model, and compared the result of the simulation to the experimental data. It was clarified that the major reason behind the disagreement was the difference in the pressure definition of the fan model from the PQ curve measured using a chamber. Based on this, a simple method was proposed to correct this definition. Also, the system effect, which is the impact of obstacles on the fan delivery curve, was investigated by setting a cylindrical obstacle at upstream or downstream proximity of the fan.
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9

Utschick, Matthias, e Thomas Sattelmayer. "Flame Holding in the Premixing Zone of a Gas Turbine Model Combustor After Forced Ignition of H2-NG-Air-Mixtures". In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56246.

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Flashback and self-ignition in the premixing zone of typical gas turbine swirl combustors in lean premixed operation are immanent risks and can lead to damage and failure of components. Thus, steady combustion in the premixing zone must be avoided under all circumstances. This study experimentally investigates the flame holding propensity of fuel injectors in the swirler of a gas turbine model combustor with premixing of H2-NG-air-mixtures under atmospheric pressure and proposes a model to predict the limit for safe operation. The A2EV swirler concept exhibits a hollow, thick walled conical structure with four tangential slots. Four fuel injector geometries were tested. One of them injects the fuel orthogonal to the air flow in the slots (jet-in-crossflow-injector, JICI). Three injector types introduce the fuel almost isokinetic to the air flow at the trailing edge of the swirler slots (trailing edge injector, TEI). A cylindrical duct and a window in the swirler made of quartz glass allow the application of optical diagnostics (OH* chemiluminescence and Planar Laser Induced Fluorescence of the OH radical (OH-PLIF)) inside the swirler. The fuel-air-mixture was ignited with a focused single laser pulse during steady operation. The position of ignition was located inside the swirler in proximity to a fuel injection hole. If the flame was washed out of the premixing zone not later than four seconds after the ignition the operation point was defined as safe. Operation points were investigated at three air mass flows, three air ratios, two air preheat temperatures (573 K, 673 K) and 40 to 100 percent per volume hydrogen in the fuel composed of hydrogen and natural gas. The determined safety limit for atmospheric pressure yields a similarity rule based on a critical Damköhler number. Application of the proposed rule at conditions typical for gas turbines leads to these safety limits for the A2EV burner: With the TEIs the swirler can safely operate with up to 80 percent per volume hydrogen content in the fuel at an air ratio of two. With the JIC injector safe operation at stoichiometric conditions and 95 percent per volume hydrogen is possible.
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10

Grassi, Walter, e Daniele Testi. "Heat Transfer Augmentation by Ion Injection in an Annular Duct". In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56625.

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The thermofluid dynamic effects of ion injection from sharp metallic points added perpendicularly to the inner wire of a short horizontal annulus were experimentally investigated. A dielectric liquid (FC-72 by 3M) was weakly forced to flow in the duct, which was uniformly heated on the outer wall. A d.c. voltage as high as 22 kV was applied to the inner electrode, while the heated wall was grounded. Both the laminar and the turbulent mixed convection regimes were obtained, varying the imposed flow rate. Once an electric field is applied, the flow is dramatically modified by the jets of charged particles, which transfer their momentum to the neutral adjacent ones. Different injection strengths were obtained on the emitters, because the shape of the point tips was not controlled at the micro-scale. Nusselt number distributions were obtained azimuthally and longitudinally, monitoring the wall temperatures. In all cases, heat transfer turned out greatly enhanced in the proximity of the emitters, without a significant increase in pressure drop through the test section and with a negligible Joule heating, making this technique very attractive for application in compact heat exchangers.
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