Gotowe bibliografie tematyczne / Float Rotation

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Gotowa bibliografia na temat „Float Rotation”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Float Rotation"

Aggarwal, Sahil, C. Ellis Wisely, Andrew Gross i Pratap Challa. "Transition to a Night Float System in Ophthalmology Residency: Perceptions of Resident Wellness and Performance". Journal of Academic Ophthalmology 14, nr 01 (styczeń 2022): e120-e126. http://dx.doi.org/10.1055/s-0042-1747969.

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Abstract Purpose The purpose of this study is to characterize the influence of a new night float rotation on resident wellness and performance in the Duke University Eye Center Ophthalmology Residency Program. Methods We analyzed three classes of ophthalmology residents: one class (n = 4) utilized the new night float rotation with no daytime clinical duties, while two senior classes (n = 12) utilized the traditional call system wherein they had daytime and nighttime responsibilities. Residents completed a questionnaire regarding their perceptions of the night float rotation. Supervising attendings (n = 15) were also surveyed about their perceptions of the new rotation. Results Zero of the four residents on the night float rotation reported burnout compared with 6 of 11 residents in the traditional call system. Most residents supported the adoption of the night float rotation, but this trend was less apparent among fellows and attendings.Most respondents believed the new night float rotation reduced burnout, fatigue, and work hours while increasing time for nonclinical activities. Perceived skills gained while on call were felt to be similar between the two call systems. Fellows and attendings believed residents in the night float system performed similarly or better than residents in the traditional system in indicators such as knowledge and enthusiasm. There was no significant difference in the average number of patient encounters (290.8 ± 30.5 vs. 310.7 ± 25.4, p = 0.163), phone encounters (430.8 ± 20.2 vs. 357.1 ± 90.0, p = 0.068), or average hours worked per week (57.3 ± 4.6 vs. 58.0 ± 5.7 p = 0.797) per resident between night float residents and traditional call residents. Conclusions This study shows resident support for a night float rotation in ophthalmology residency at Duke, with reductions in burnout and more time for nonclinical activities without affecting perceived clinical performance. We hope this study serves as an impetus for other ophthalmology programs considering a transition to a night float system.

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Sadowski, Brett W., Hector A. Medina, Joshua D. Hartzell i William T. Shimeall. "Nighthawk: Making Night Float Education and Patient Safety Soar". Journal of Graduate Medical Education 9, nr 6 (1.12.2017): 755–58. http://dx.doi.org/10.4300/jgme-d-17-00259.1.

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ABSTRACT Background Some residency programs responded to duty hour restrictions by implementing night rotations. Night supervision models can vary, resulting in potential patient safety issues and educational voids for residents. Objective We evaluated the impact of multiple evidence-based interventions on resident satisfaction with supervision, perception of the education value of night rotations, and residents' use of online educational materials. Methods The night team was augmented with an intern to assist with admissions and a senior resident (the “nighthawk”) to supervise inpatient care and deliver a night medicine curriculum. We instituted a “must-call” list, with specific clinical events requiring mandatory attending notification, and reduced conflict in the role of the night float team. We studied patient contact, online curriculum use, residents' perceptions of nighthawk involvement, exposure to educational materials, and satisfaction with supervision. Results During the first half of academic year 2016–2017, 51% (64 of 126) of trainees were on the night medicine rotation. The nighthawk reviewed 1007 intern plans (15 per night; range, 6–36) and supervised 215 hands-on evaluations, including codes and rapid responses (3 per night; range, 0–12). The number of users of the online education materials increased by 85% (13 to 24), and instances of use increased 35% (85 to 115). The majority of residents (79%, 27 of 34) favored the new system. Conclusions A nighthawk rotation, a must-call list, and reducing conflict in night team members' roles improved resident satisfaction with supervision and the night medicine rotation, resulting in increased communication.

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Jung, Jung-Mo, Yoshiki Matsushita i Seonghun Kim. "Study on Reducing Towing Drag by Varying the Shape and Arrangement of Floats and Gears". Applied Sciences 12, nr 15 (28.07.2022): 7606. http://dx.doi.org/10.3390/app12157606.

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Many studies have been conducted with the aim of reducing fuel consumption by the fishing industry. We examined whether drag can be reduced by changing the arrangement of gears without requiring the development of new parts for the conventional float and ground gear. Ten differently shaped floats and ground gears were measured in a water flume tank. The float and ground gear were fixed to a steel rod to measure fluid drag according to attack angle, using a multi-component load cell. To estimate the frictional drag of ground gear on the seabed, five types of large ground gear were towed on flat land while changing attack angle using the load cell to measure tension. The fluid drag of the float and ground gear was highest at an attack angle of 60°, regardless of shape, size, and flow velocity. The resistance coefficients of the float and ground gear varied depending on the attack angle and tended to be lower at small attack angles. The frictional drag of the ground gear was greater when the axis of rotation had a small attack angle in the towing direction compared to other attack angles. We then investigated a method for designing bottom-towed gear that reduces drag while maintaining the size, buoyancy, and sinking force of conventional fishing gear parts. This gear design showed 1.2% drag reduction and an estimated 0.8% improvement in fuel efficiency per haul.

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Scali, Elena P., Evgeny Strovski, Bruce B. Forster, Colin Mar i Silvia D. Chang. "Sink or Night Float: University of British Columbia Radiology Residents' Experience with Overnight Call". Canadian Association of Radiologists Journal 66, nr 2 (maj 2015): 185–89. http://dx.doi.org/10.1016/j.carj.2014.07.003.

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Purpose In July 2012, in response to residents' concerns regarding the impact of the traditional 24-hour call system on their personal well-being and educational experience, the University of British Columbia Radiology residency program adopted a 12-hour night float system. This shift takes place in the context of increasing concerns, both across Canada and internationally, about resident well-being and the impact of prolonged duty hours on patient care. Methods An anonymous survey was distributed to all 25 postgraduate years 2-5 University of British Columbia radiology residents 12 months after the introduction of night float. This study sought to solicit residents' feedback about these changes and to identify potential future changes to optimize the call system. Results The response rate was 100%; 96% of residents were in favor of continuing with night float rather than the traditional call system; 72% of residents reported that their judgement was affected secondary to being on night float. Although most residents described varying degrees of impairment, the rate of acute discrepancies between resident preliminary and attending radiologist final reports decreased by more than half, from 2% to less than 1%. Conclusions The vast majority of our residents were in favor of maintaining the night float call system. Night float had a beneficial effect on the resident educational experience: by eliminating the pre-call morning and post-call day off rotation, residents gained an additional 24 days per year on other clinical rotations.

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Kozlov, Victor G., i Stanislav V. Subbotin. "Vibrational Suspension of Light Sphere in a Tilted Rotating Cylinder with Liquid". Advances in Acoustics and Vibration 2014 (16.03.2014): 1–6. http://dx.doi.org/10.1155/2014/608058.

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The dynamics of a light sphere in a quickly rotating inclined cylinder filled with liquid under transversal vibrations is experimentally investigated. Due to inertial oscillations of the sphere relative to the cavity, its rotation velocity differs from the cavity one. The intensification of the lagging motion of a sphere and the excitation of the outstripping differential rotation are possible under vibrations. It occurs in the resonant areas where the frequency of vibrations coincides with the fundamental frequency of the system. The position of the sphere in the center of the cylinder could be unstable. Different velocities of the sphere are matched with its various quasistationary positions on the axis of rotating cavity. In tilted rotating cylinder, the axial component of the gravity force appears; however, the light sphere does not float to the upper end wall but gets the stable position at a definite distance from it. It makes possible to provide a vibrational suspension of the light sphere in filled with liquid cavity rotating around the vertical axis. It is found that in the wide range of the cavity inclination angles the sphere position is determined by the dimensionless velocity of body differential rotation.

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Weidman, Patrick D., i Michael A. Sprague. "Steady and unsteady modelling of the float height of a rotating air hockey disk". Journal of Fluid Mechanics 778 (30.07.2015): 39–59. http://dx.doi.org/10.1017/jfm.2015.374.

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A similarity reduction of the Navier–Stokes equations for the motion of an infinite rotating disk above an air-bearing table yields a coupled pair of ordinary differential equations governed by a Reynolds number $Re=Wh/{\it\nu}$ and a rotation parameter $S=\sqrt{2}h{\it\Omega}/W$, where $h$ is the float height, $W$ is the air levitation velocity, ${\it\Omega}$ is the disk rotation rate, and ${\it\nu}$ is the kinematic viscosity of air. After deriving the small- and large-Reynolds-number behaviour of solutions, the equations are numerically integrated over a wide range of $Re{-}S$ parameter space. Zero-lift boundaries are computed as well as the boundaries separating pure outward flow from counter-flow in the gap. The theory is used to model the steady float height of a finite-radius air hockey disk under the assumption that the float height is small relative to the diameter of the disk and the flow is everywhere laminar. The steady results are tested against direct numerical simulation (DNS) of the unsteady axisymmetric Navier–Stokes equations for the cases where the disk rotates at constant angular velocity but is either at a fixed height or free to move axially. While a constant shift in the gap pressure conforms closely to that found using steady theory, the interaction of the radial jet emanating from the gap with a vertical transpiration field produces vortex rings which themselves propagate around to interact with the jet. Although these structures diffuse as they propagate up and away from the gap, they induce a departure from the steady-flow assumption of atmospheric pressure at the gap exit, thus inducing small irregular axial oscillations of the floating disk.

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DeFilippis, Andrew Paul, Ildefonso Tellez, Neil Winawer, Lorenzo Di Francesco, Kimberly D. Manning i Sunil Kripalani. "On-site Night Float by Attending Physicians: A Model to Improve Resident Education and Patient Care". Journal of Graduate Medical Education 2, nr 1 (1.03.2010): 57–61. http://dx.doi.org/10.4300/jgme-d-09-00073.1.

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Abstract Background In 2003, the Accreditation Council for Graduate Medical Education instituted common duty hour limits, and in 2008 the Institute of Medicine recommended additional limits on continuous duty hours. Using a night-float system is an accepted approach for adhering to duty hour mandates. Objective To determine the effect of an on-site night-float attending physician on resident education and patient care. Methods Night-float residents and daytime ward residents were surveyed at the end of their rotation about the impact of an on-site night-float attending physician on education and quality of patient care. Responses were provided on a 5-point Likert scale ranging from 1, strongly agree, to 5, strongly disagree. Results Overall, 92 of the 140 distributed surveys were completed (66% response rate). Night-float residents found the night-float attending physician to be helpful with cross-cover issues (mean = 2.00), initial history and physical examination (mean = 1.56), choosing appropriate diagnostic tests (mean = 1.79), developing a treatment plan (mean = 1.74), and improving overall patient care (mean = 1.91). Daytime ward residents were very satisfied with the quality of the admission workups (mean = 1.78), tests and diagnostic procedures (mean = 1.76), and initial treatment plan (mean = 1.62) provided by the night-float service. Conclusion A night-float system that includes on-site attending physician supervision can provide a valuable opportunity for resident education and may help improve the quality of patient care.

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Nikiforov, A. N., G. Ya Panovko i V. P. Roizman. "Conditions for stable rotation of a rotor with a float self-balancer". Mechanics of Solids 50, nr 3 (maj 2015): 353–58. http://dx.doi.org/10.3103/s0025654415030115.

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Lafleur, Alexandre, Adrien Harvey i Caroline Simard. "Adjusting to duty hour reforms: residents’ perception of the safety climate in interdisciplinary night-float rotations". Canadian Medical Education Journal 9, nr 4 (13.11.2018): e111-119. http://dx.doi.org/10.36834/cmej.43345.

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Background: New scheduling models were needed to adjust to residents’ duty hour reforms while maintaining safe patient care. In interdisciplinary night-float rotations, four to six residents from most residency programs collaborated for after-hours cross-coverage of most adult hospitalised patients as part of a Faculty-led rotation. Residents worked sixteen 12-hour night shifts over a month. Methods: We measured residents’ perception of the patient safety climate during implementation of night-float rotations in five tertiary hospitals. We surveyed 267 residents who had completed the rotation in 2015-2016 with an online version of the Safety Attitudes Questionnaire. First year residents came from most residency programs, second- and third-year residents came from internal medicine.Results: One-hundred-and-thirty residents completed the questionnaire. Scores did not differ across hospitals and residents’ years of training for all six safety-related climate factors: teamwork climate, job satisfaction, perceptions of management, safety climate, working conditions, and stress recognition.Conclusion: Simultaneous implementation in five hospitals of a Faculty-led interdisciplinary night-float rotation for most junior residents proved to be logistically feasible and showed similar and reassuring patient safety climate scores._____Contexte: De nouveaux horaires de garde en établissements hospitaliers étaient nécessaires pour s’adapter aux réformes des heures de travail des résidents tout en maintenant des soins sécuritaires pour les patients. Dans les stages cliniques de nuit interdisciplinaires, quatre à six résidents de la plupart des programmes de résidence ont collaboré pour assurer une couverture croisée, après les heures normales de travail, de la plupart des patients adultes hospitalisés. Les résidents ont travaillé seize nuits de 12 heures durant un mois.Méthodes: Nous avons mesuré la perception des résidents du climat de travail lié à la sécurité des patients lors de la mise en place de stages de nuit dans cinq hôpitaux universitaires. Nous avons interrogé 267 résidents ayant terminé le stage en 2015-2016 avec une version numérique du Safety Attitudes Questionnaire. Les résidents de première année provenaient de la plupart des programmes de résidence, les résidents de deuxième et troisième années provenaient du programme de médecine interne.Résultats: 130 résidents ont complété le questionnaire. Les scores ne différaient pas entre les hôpitaux et les années de formation des résidents pour les six facteurs liés à la sécurité des patients: climat de travail en équipe, satisfaction au travail, perceptions des supérieurs, climat de sécurité, conditions de travail et reconnaissance du stress.Conclusions: La mise en place simultanée, dans cinq hôpitaux, de stages cliniques de nuit réunissant des résidents juniors de la majorité des programmes de résidence fut logistiquement possible et a montré des résultats similaires et rassurants sur le climat de travail lié à la sécurité des patients.

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Fang, Hong Wei, Jia Jia Cheng, Qi Wei Yang i Jing Lian. "Multi-Frequency Proportional-Resonant Control for Wave Power Generation System". Advanced Materials Research 760-762 (wrzesień 2013): 1139–43. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.1139.

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A grid voltage vector oriented proportional resonant (PR) control strategy is applied to the grid current control of the float-type wave power generation system. Compared with the conventional double closed-loop proportional integral (PI) control method, the proposed multi-frequency PR control method can realize zero steady-state error in AC input signal in the stationary frame, without complex coordinate rotation transformation and decoupling control. The overall wave power generation system model is built with Matlab/Simulink to evaluate the performance of the PR control method. Simulation results have shown that the PR control can well improve the robustness and the power quality of the float-type wave energy conversion control system.

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Rozprawy doktorskie na temat "Float Rotation"

Gralla, Samuel E., Alexandru Lupsasca i Alexander Philippov. "PULSAR MAGNETOSPHERES: BEYOND THE FLAT SPACETIME DIPOLE". IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622675.

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Most studies of the pulsar magnetosphere have assumed a pure magnetic dipole in flat spacetime. However, recent work suggests that the effects of general relativity are in fact of vital importance and that realistic pulsar magnetic fields will have a significant nondipolar component. We introduce a general analytical method for studying the axisymmetric force-free magnetosphere of a slowly rotating star of arbitrary magnetic field, mass, radius, and moment of inertia, including all the effects of general relativity. We confirm that spacelike current is generically present in the polar caps (suggesting a pair production region), irrespective of the stellar magnetic field. We show that general relativity introduces a similar to 60% correction to the formula for the dipolar component of the surface magnetic field inferred from spindown. Finally, we show that the location and shape of the polar caps can be modified dramatically by even modestly strong higher moments. This can affect emission processes occurring near the star and may help explain the modified beam characteristics of millisecond pulsars.

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Sheta, Amal. "IMRT and Rotational IMRT (mARC) Using Flat and Unflat Photon Beams". Doctoral thesis, Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-208212.

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For more than 50 years attening filters have been inserted into the beam path oflinacs to produce a uniform energy fluence distribution of the photon beam and make it suitable for clinical use. Recently, linacs without flattening fifilter (Flattening FilterFree - FFF) are increasingly used in radiotherapy because of its benefifits, e.g. high dose rate (2000 MU/min), reduced scattered and leakage radiation. Hypofractionated radiotherapy is interested in the high dose rate of FFF beams to shorten the treatment delivery time (TDT) especially the FFF beams have acceptable flatness at small fifieldsizes. Radiotherapy techniques that deliver intensity-modulated beams (IMBs), e.g.Tomotherapy, intensity modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT), deal with the non-uniformity of the FFF beam profifile and produce homogeneous dose to the target as FF beams do. Siemens modified the Artiste linac in order to enable photon beam delivery with and without a flattening fifilter. The VMAT version developed by Siemens for Artiste linacs as a novel radiation technique is a modulated arc therapy (mARC). mARC technique is available with single, double and multiple complete or partial arcs. The aims of the current study were the determination of the main characteristics of 7 MV and 11 MV FFF photon beams in comparison with their corresponding 6 MV and 10 MV FF photon beams from Artiste digital linacs. Furthermore, IMRT planning comparisons using FF and FFF photon beams were performed using an Oncentra planning system. The performance of various mARC techniques were estimated and compared with Step and Shoot (S&S) IMRT by using a RayStation planning system. The mARC plans created by FF and FFF beams were evaluated to know which technique is the best. All the treatment plans were created for simple and complex shaped target volumes. The treatment plans are compared using two parameters - plan quality and treatment effi ciency. In addition to the planning study, the plan quality assurance of IMRT and mARC plans were performed using two difffferent volumetric quality assurance devices, Delta4 and Octavius 4D. Removal of the flattening fifilter causes changes in the dosimetric features of photon beams. IMRT plans with and without flattening fifilter were clinically acceptable where both plans have similar quality. In comparison with IMRT-FF, IMRT-FFF plansrequire more MUs and for some clinical cases require longer TDT. mARC technique can deliver dose distributions that are comparable to S&S-IMRT and could be an alternative with a potential to improve the effi ciency of the IMRT treatment delivery.

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Wojcik, Craig James. "The dynamics of spanwise vorticity on a rotating flat plate in a starting motion". Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/3012.

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The initial rotation of flat, rectangular plates in quiescent flow were studied experimentally using two-dimensional and stereoscopic particle image velocimetry. The study examined the vortex dynamics of spanwise vorticity created on the upper, leeward surface of each plate of aspect ratio 2 and 4, which consists primarily of a leading-edge vortex. Reynolds numbers of 4,000, 8,000, and 16,000 based on the tip velocity and angles of attack of 25°, 35°, and 45° were investigated at five different azimuthal locations (90°, 180°, 235°, 270°, and 320°). The 25% and 50% spanwise positions for the aspect ratio 4 plate and 50% spanwise position for the aspect ratio 2 plate were studied. For the 25% and 50% spanwise location for the aspect ratio 4 and 2 plate, respectively, the leading-edge vortex structure's shape and coherence appear to be evolving temporally as the plate begins its initial motion. Leading-edge vortex circulation measurements confirm there is a non-monotonic trend showing increasing values until an azimuthal position of approximately 220° where there is a dip in the circulation values, but the circulation then rises towards the end of the range of azimuthal positions investigated. A strong region of counter-rotating vorticity was observed on the surface of the plate beneath the leading-edge vortex from the interaction of the leading-edge vortex with the plate. It was hypothesized that the interactions between the leading-edge vortex and counter-rotating vorticity are an important factor in governing the dynamics and strength of the leading-edge vortex which may ultimately determine whether the leading-edge vortex remains attached. To validate this claim, a transport analysis of the vorticity in the leading-edge vortex was developed to determine the contributions of spanwise flux, tilting of in-plane vorticity components, the shear layer, and annihilation has on the rate of change of circulation of the leading-edge vortex in the spanwise direction. Results of this analysis indicate that annihilation of the leading-edge vortex from entrainment of the counter-rotating vorticity is an important factor in governing the dynamics of the leading-edge vortex.

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Rietz, Frank [Verfasser], i Ralf [Akademischer Betreuer] Stannarius. "Convection and segregation of beads in a flat rotating box / Frank Rietz. Betreuer: Ralf Stannarius". Magdeburg : Universitätsbibliothek, 2012. http://d-nb.info/1054135398/34.

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Muňko, Matej. "Administrativní budova v Brně". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-391967.

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The subject of this work is a new administrative building in Brno, district Brno – Stred. The aim of this work is to create documentation for realization. Building has twelve floors, while every floor is rotated by 5° relative to the previous floor counterclokwise. Final rotation between the first and the last floor is 60°. On the first floor there is a restaurant, on the next eleven floors there are administrative spaces. Building is without basement and has a single-layer flat roof. The foundations are made from a system of piles, which co-work with the waterproof foundation slab. Whole construction system is made from cast-in-place reinforced conrete.

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Борисенко, Олексій Андрійович, Алексей Андреевич Борисенко, Oleksii Andriiovych Borysenko i Е. В. Татарко. "О строении трехмерных поверхностей с метрикой вращения". Thesis, Сумский государственный университет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/39365.

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Многомерная риманова метрика называется метрикой вращения. При этом поверхность, несущая метрику вращения, не обязательно является поверхностью вращения. Тогда возникает вопрос о том, какие условия нужны для того, чтобы подмногообразия с метрикой вращения были многомерными поверхностями вращения.

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Sheta, Amal [Verfasser], Ulrich [Akademischer Betreuer] Wolf, Thomas [Akademischer Betreuer] Kuhnt, Rolf-Dieter [Gutachter] Kortmann i Tilo [Gutachter] Wiezorek. "IMRT and Rotational IMRT (mARC) Using Flat and Unflat Photon Beams / Amal Sheta ; Gutachter: Rolf-Dieter Kortmann, Tilo Wiezorek ; Ulrich Wolf, Thomas Kuhnt". Leipzig : Universitätsbibliothek Leipzig, 2016. http://d-nb.info/1240627637/34.

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Xie, Ren-jie, i 謝仁傑. "Multidimensional Rotation Codes for Flat Fading Channels". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/93236278773016473519.

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碩士
國立高雄第一科技大學
電腦與通訊工程研究所
100
The performance of phase-shift-keying (PSK) and quadrature amplitude modulation (QAM) schemes over fading channels can be improved by using space-time code. In this thesis, improvement is due to the rotation code[2] coupled with interleaving, and enables one to trade diversity for system complexity, at no power or bandwidth expense. Introduction of mobile wireless channel and it’s simulation, and performance of rotation code when channel is changing between Rayleigh and Rician channel, calculation of the optimum angle for the rotaion code,and performance of all angle by simulation are studied in details. Finally, we would show that the optimal angle and it’s performance of multidimensional rotation code in swiching-channels is robustness.

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Li, Yi-Lin, i 李宜霖. "The Design of LED Display using Flat Surface Rotating Mechanism". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/50277876247360806846.

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碩士
國立交通大學
電機與控制工程系
89
Due to the cost of the high illuminating LED for a large scale full color LED display, In the present thesis, we propose a design that can be used to reduce the total number of LEDs in the display. In this design, the time-spatial sharing mechanism is developed to share the illumination using moving LED bars. By driving the LED bars according to the time-space and coordinate on the LED display synchronously, we not only can get realistic illuminance, but also save the number of LEDs used in the system considerably. The purpose of this thesis is to analyze the feasibility of utilizing the human vision in halting image. Here, the time-spatial sharing mechanism or the flat surface rotating mechanism is developed for one dimensional scanning effect that is used to produce a complete image .The mechanism consists of two parts: a conveyer with LED bar attached on the belt and a driving motor that produce the scanning effect on the LED bars. In this thesis, we have completed the motor servo control for stabilizing the scanning speed and the generation of synchronization signal so that image signal can be transmitted accordingly.

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Shen, Jia-Hung, i 沈佳鴻. "Co-rotational formulation for the triangular thin flat shell element". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/34040533911244343783.

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碩士
國立交通大學
機械工程系所
102
A facet triangular shell element with drilling degree of freedom is developed by using a corotational total Lagrangian formulation for the geometrically nonlinear analysis of thin shell structure with large rotation but small strain. The element developed has three nodes with nine degrees of freedom per node. The element nodes are chosen to be located at the mid-plane of the plate element. The deformations of the shell element are described in a current element coordinate system constructed at the current configuration of the shell element. The element nodal forces are derived using the virtual work principle, the exact kinematics of the von Karman plate, and the consistent second order linearization. The element tangent stiffness matrix may be obtained by differencing the element nodal force with respect to nodal parameters. The deformation of the shell element is determined by the displacements of the mid-plane and the rotations of a mid-plane coordinate system associated with each point of the mid-plane relative to the current element coordinate system. The origin of the mid-plane coordinates is rigidly tied to mid-plane. Three rotation parameters are defined to describe the rotation of the mid-plane coordinate system. For convenience, two set of nodal parameters are employed to determine the displacement fields of the element. The first set of nodal parameters is chosen to be three nodal displacements, three nodal rotation parameters, and three strains. The second set of nodal parameters is chosen to be three nodal displacement and six nodal values of the first spatial derivative of displacements. To determine the relationship between these two sets of nodal parameters, the deformation gradient at each element node is decomposed into the product of a proper orthogonal matrix and a right stretch matrix by using the polar decomposition theorem, and the rotation matrix corresponding to the rotation of the mid-plane coordinate system relative to the current element coordinate system is regarded as the proper orthogonal matrix. Two sets of nodal parameters are used for the assembly of the structural equations. An incremental-iterative method based on the Newton-Raphson method combined with constant arc length of incremental displacement vector is employed for the solution of nonlinear equilibrium equations. The zero value of the tangent stiffness determinant of the structure is used as the criterion of the buckling state. Benchmark problems for linear and geometric nonlinear analysis of shells given in the literature are studied to demonstrate the accuracy and efficiency of the proposed shell element. The effect of the first order terms of the transformation matrix between the variation of the two sets of nodal parameters on the equilibrium path and buckling load are also investigated.

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Książki na temat "Float Rotation"

Fowlis, William W. Analytical and numerical studies of the thermocapillary flow in a uniformly rotating floating zone. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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J, Fridrich Chris, United States. Dept. of Energy. Yucca Mountain Project Office i Geological Survey (U.S.), red. Space-time patterns of Late Cenozoic extension, vertical-axis rotation, and volcanism in the Crater Flat basin, southwest Nevada. [Denver, CO]: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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J, Fridrich C., United States. Dept. of Energy. Yucca Mountain Project Office i Geological Survey (U.S.), red. Space-time patterns of Late Cenozoic extension, vertical-axis rotation, and volcanism in the Crater Flat basin, southwest Nevada. [Denver, CO]: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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J, Fridrich Chris, United States. Dept. of Energy. Yucca Mountain Project Office. i Geological Survey (U.S.), red. Space-time patterns of Late Cenozoic extension, vertical-axis rotation, and volcanism in the Crater Flat basin, southwest Nevada. [Denver, CO]: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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Ruban, Anatoly I. Classical Boundary-Layer Theory. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199681754.003.0002.

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Chapter 1 discusses the flows that can be described in the framework of Prandtl’s 1904 classical boundary-layer theory, including the Blasius boundary layer on a flat plate and the Falkner–Skan solutions for the boundary layer on a wedge surface. It presents Schlichting’s solution for the laminar jet and Tollmien’s solution for the viscous wake. These are followed by analysis of Chapman’s shear layer performed with the help of Prandtl’s transposition theorem. It also considers the boundary layer on the surface of a fast rotating cylinder with the purpose of linking the circulation around the cylinder with the speed of its rotation. It concludes discussion of the classical boundary-layer theory with analysis of compressible boundary layers, including the interactive boundary layers in hypersonic flows.

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Space-time patterns of Late Cenozoic extension, vertical-axis rotation, and volcanism in the Crater Flat basin, southwest Nevada. [Denver, CO]: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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Części książek na temat "Float Rotation"

Schroyen, Joeri, Sven De Rijcke i Sander Valcke. "Flat Metallicity Profiles in Rotating Dwarf Galaxies". W Astrophysics and Space Science Proceedings, 59–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22018-0_6.

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Masuda, S., K. Okamae i I. Ariga. "Transition of Boundary Layer on Rotating Flat Plate". W Laminar-Turbulent Transition, 699–704. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82462-3_86.

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Capozziello, Salvatore. "Recovering Flat Rotation Curves and Galactic Dynamics From f(R)-Gravity". W Astrophysics and Space Science Proceedings, 3–17. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-02063-1_1.

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Masuda, S., i M. Matsubara. "Visual Study of Boundary Layer Transition on Rotating Flat Plate". W Laminar-Turbulent Transition, 465–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84103-3_42.

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Pellegrini, S., i L. Ciotti. "The Energetics of Flat and Rotating Early-Type Galaxies and Their X-Ray Luminosity". W New Light on Galaxy Evolution, 430. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0229-9_141.

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Khaledi, Hatef A., Mustafa Barri i Helge I. Andersson. "Asymmetric vortex shedding in the turbulent wake of a flat plate in a rotating fluid". W Springer Proceedings in Physics, 301–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03085-7_73.

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Hosaka, H., i S. H. Crandall. "Self-excited vibrations of a flexible disk rotating on an air film above a flat surface". W Advances in Dynamic Systems and Stability, 115–27. Vienna: Springer Vienna, 1992. http://dx.doi.org/10.1007/978-3-7091-9223-8_9.

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Pavar, Pushpabai, L. Harikrishna i M. Suryanarayana Reddy. "Hall Effects on MHD Rotating Nano Fluid Over a Moving Flat Plate with Radiation and Chemical Reaction". W Advances in Fluid Dynamics, 53–66. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4308-1_4.

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De Francesco, Eduardo, i Manuel Greco. "Amphibious Vehicles". W Monitoring and Protection of Critical Infrastructure by Unmanned Systems. IOS Press, 2023. http://dx.doi.org/10.3233/nicsp230005.

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An amphibious vehicle is a transport able of moving both on land and on water. In these last years, the ability of autonomous and semi-autonomous amphibious vehicles to operate in harsh environments is becoming increasingly important for military and civilian operations. Apart from the size of the vehicles, they can be divided into two broad categories: Hovercraft and all those vehicles that can operate not only on water, but on multiple terrains (all-terrain) such as ice, snow and mud. Some of them are based on tracked or wheeled movements; there is also a “screw” configuration used for muddy soils. In some cases, when vehicles are heavier than water, therefore unable to float, rigid or inflatable floats are applied. For propulsion in water, propellers or ducted propellers are used, or the rotation of the wheels themselves or of the tracks is exploited. In this chapter some amphibious vehicles, both civil and military will be presented.

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Kanemoto, Toshiaki. "Counter-Rotating Type Power Technologies to Exploit Offshore Energies". W Advances in Electronic Government, Digital Divide, and Regional Development, 234–53. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-1625-7.ch012.

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For the next leap in power-generating technologies, the world is obligated to not only cope with the warming global environment but also to conserve the natural ecosystem. This chapter discusses the advances in technology designed to successfully exploit offshore marine and wind resources. (1) The Counter-Rotating Type Hydro/Tide Power Unit, which is composed of the tandem runners and the peculiar generator with double rotational armatures, is applicable to both rising and falling tides at the power station with the embankment, in place of the traditional bulb type turbines. (2) The Floating Type Ocean Wave Power Station, where a pair of floats lines up at the wavelength spacing, can get the superabundant velocity energy. (3) The Intelligent Wind/Tide Power Unit, which is composed of the tandem wind/tide rotors and the double rotational armatures, is suitable for offshore wind and the tidal stream.

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Streszczenia konferencji na temat "Float Rotation"

Korobiichuk, Igor, Viktorij Melnick, Vera Kosova i Kateryna Maksymenko. "DISTURBED MOVEMENT OF THE MOVING PART OF THE GYRO SUSPENSION". W 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/4.1/s17.06.

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The development of hypersonic technology creates a new challenge for inertial navigation sensors, which are widely used in aviation navigation systems. Improving the accuracy of navigation equipment will reduce fuel consumption and reduce the impact of harmful emissions on the atmosphere. The operation of sensors that are part of navigation systems, such as gyroscopes, work in difficult conditions, which affects their accuracy. A float two-degree angular velocity sensor is considered. The reaction of a float two-stage angular velocity sensor to a simultaneous perturbation from the side of the hull - a kinematic perturbation - and penetrating acoustic radiation from the side of the rocket propulsion engines is determined. The article establishes when there is no penetrating acoustic effect, as well as the determining relationship between the steady angle of rotation of the float and a constant input value. The determination of the zero shift of the device, due only to the angular vibrations of the body and penetrating acoustic radiation, that is, in the absence of circulation on the trajectory, is analyzed. The response of a float gyroscope to the harmonic oscillations of the base is analyzed. The effect of zero shift of the device, caused only by angular vibrations of the launch vehicle body and penetrating acoustic radiation, is considered.

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Chandrasekaran, Srinivasan, i Harender. "Design and Efficiency Analysis of a Mechanical Wave Energy Converter". W ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49830.

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Wave energy is the most promising natural energy resource that is gaining momentum in the recent years. Successful attempts are made by several researchers to harness wave energy by heave, surge and sway motion of the devices; however no successful commercial model is launched till date leaving this domain as a research potential. Among the proposed technologies, point absorbers are found to be commercially viable to a greater extent primarily due to its simplicity. The present study discusses a new mechanical wave energy converter (MWEC) using point absorber as a wave energy capturing device. Heave motion of a floating buoy due to incident wave field is harnessed to produce power. The conversion takes place in four different stages namely: i) motion of a gear rack, attached to floating buoy results in heave motion; ii) this vertical reciprocating motion is converted to oscillatory rotation of a shaft by a rack and pinion arrangement; iii) alternative rotary motion is converted in to continuous unidirectional rotation using a unidirectional chain assembly; and iv) unidirectional rotation is converted in to other usable energy form. MWEC employs numerous operating advantages over other systems such as: (i) the rack and pinion gear arrangement enabling the buoy to float in line to the changing water levels automatically. (ii) use of RPM multiplier enables rotation of generator shaft at high RPM even for small displacement of float; (iii) the free wheel sprockets of unidirectional chain assembly enable the gear rack to produce a positive upward stroke and a positive downward stroke for every passing wave impact. Further, rpm multiplier shall be easily adjusted to rotate the generator at desired rpm while the whole operation shall be shut down on emergency. The paper presents a detailed analysis of the mechanical system to arrive at the efficiency of the developed MWEC. Based on the studies conducted, it is seen that the overall efficiency of the MWEC is about 19% while maintaining maximum possible efficiency of the mechanical systems involved in the design.

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Fu, Tao, Qinghai Yang, Chuan Yu, Ming Li i Chenglong Liao. "A Magnetic Levitation Turbine Generator for Downhole Electronic Devices". W SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210618-ms.

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Abstract With the popularization of electronic wellbore control devices, downhole power supply becomes more and more important. A downhole generator can transform the mechanical energy of underground fluid into electric energy, which is an ideal way to provide power for electrical devices. However, traditional generators have the disadvantages of large starting flow and short service life due to dynamic friction. In this paper, a magnetic levitation turbine generator is introduced to solve the common problem of dynamic friction of packing in a shaft generator. In theory, downhole flow can provide the impact force to spin the turbine. However, the axial component of this force pushes the turbine into the supporting area so much that the friction between them may create too much resistance to start the rotation. To solve this problem, a magnetic levitation structure is proposed in this paper to provide a counterforce to the axial component of the thrust of flow, so that the turbine and the rotor core can float in the pipeline, thus completely eliminating contact friction and allowing free rotation of the turbine. Through 3D printing, turbines of different blade numbers, and blade angles were manufactured. Three design schemes were assembled using these turbines. The experimental results showed that all the turbines can rotate smoothly at high speed and the magnet levitation structure worked well. The rotational stabilities of turbines with magnetic levitation structure at one end and two ends were compared. The experiment showed that the inertia of the turbine with magnetic suspension structure at both ends was greatly reduced and the rotation was more stable. At a flow rate of 100-150m3/d, the rotating speed of the turbine was 600-1500rpm. The output power was 73mW after, which is enough to charge the batteries of downhole electronic devices. Using magnet levitation structure, the turbine generator can overcome the shortcoming of traditional downhole power generators. Such a new generator is expected to offer an intriguing alternative for long-term power supply of downhole electronic devices, which is an important prerequisite for the wellbore control to progress from mechanization to automation.

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Dessi, Daniele, i Edoardo Faiella. "Numerical Modeling and Experimental Comparison of the Response of Elastically Connected Barges". W ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78397.

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This paper presents a numerical model for the investigation of some hydroelastic issues related to floating systems used for the transportation and installation of components of offshore platforms, e.g., topsides. The system consists of two symmetric barges, linked together by the carried structure to form a catamaran-like layout. The flexibility of the transported structure may allow for proper excitation of the float-over system under oblique wave conditions at certain wave lengths, both during transportation and installation phases. The developed numerical code, based on multi-body dynamics and linear potential theory regarding the calculation of hydrodynamic loads, allows for a robust and fast description of the flexible floating system dynamics, including also the effect of mooring-line dynamics in the time-domain. Comparison with experimental data from a previous experimental campaign [1] shows that, notwithstanding the simplifying assumptions in the numerical model development, the amplitude of the relative pitch rotation between the barges due to the system flexibility can be properly described with the present approach.

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Tarrio, C., E. Spiller, C. J. Evans, T. B. Lucatorto i C. W. Clark. "Post-polish figuring of optical surfaces using multilayer deposition". W Extreme Ultraviolet Lithography. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/eul.1996.dfo144.

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We present preliminary results of a technique that uses deposition of variable-thickness multilayer films to correct optical figure errors. The multilayer technique offers the potential to make figure corrections, such as aspherizing high-quality spherical optics, without adding measurable roughness. Moreover, because the period of a multilayer can be measured very accurately using x-ray diffraction, we can easily map test depositions made on inexpensive float-glass substrates. We have used this technique to reduce large rotationally symmetric errors by almost an order of magnitude in a single run. Extension to the correction of non-symmetric errors was performed by deposition through a two-dimensional mask, which was less successful. We have identified several sources of error in this type of deposition and discuss means of improvement. We have devised a method using a series of rotationally-symmetric masks and a varying-rotation-rate substrate stage to reduce the two-dimensional problem to a series of one-dimensional problems.

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Mariot, Antoine, Mihai Arghir, Pierre Hélies i Jérôme Dehouve. "Experimental Analysis of Floating Ring Annular Seals and Comparisons With Theoretical Predictions". W ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43332.

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Floating ring annular seals represent one of the solutions for controlling leakage in high speed rotating machinery. They are generally made of a carbon ring mounted in a steel ring for preserving their integrity. Low leakage is ensured by the small clearance of the annular space between the carbon ring and the rotor. Under normal operating conditions, the ring must be able to “float” on the rotor in order to accommodate its vibration. Impacts between the carbon ring and the rotor may occur when the annular seal is locked up against the stator and the amplitude of rotor vibrations are larger than the radial clearance. This situation is prohibited because it rapidly leads to the destruction of the carbon ring. The present work presents experimental results obtained for floating ring annular seals of 38 mm, tandem mounted in a buffer seal arrangement. The rotation speed was comprised between 50 Hz and 350 Hz and maximum pressure drop was 7 bar. For these operating conditions the floating ring follows the rotor vibrations without any impacts. Comparisons were made with a theoretical model based on the equations of motion of the floating ring driven by mass inertia forces, hydrostatic forces in the (main) annular seal and by friction forces on its radial face (also named the “nose” of the seal). The friction coefficient on the nose of the floating ring was estimated from Greenwood and Williamson’s model for mixed lubrication. The present analysis validates the theoretical model used for predicting the dynamic response of the floating ring for a given rotor motion.

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Chiu, H. C., J. Y. Chen i Jerry M. Chen. "Visualization of Fluid Mixing in a Microchamber on a Rotating Disk". W ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASMEDC, 2008. http://dx.doi.org/10.1115/mnht2008-52055.

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This paper reports flow visualization experiments of fluid mixing in a microchamber on a rotating disk. The two centrifuge-driven sample fluids were brought in contact at the Y-junction microchannel and then flowed to a circular mixing chamber where the main course of mixing took place. The flow images were acquired using a micro-image-capturing unit in synchronization with the rotational motion to allow only one shot of the targeted object on the rotating disk per revolution. Both the visualization and quantification of flow images show that the mixing efficiency of the two fluids depends not only on the rotational speed but also on the depth of the channels. It is found that the mixing efficiency generally decrease with increasing rotational speed in the lower speed range (≤ 420 rpm). Beyond this lower speed range, the mixer with a larger channel depth h = 300 μm shows an increase of mixing efficiency with increasing rotational speed to reach as much as 83% at 1200 rpm. For the mixer with a smaller channel depth h = 200 μm, however, the mixing efficiency continues deceasing or becomes flat with increasing rotational speed. It is also found that the counter-clockwise rotation produces a better mixing efficiency than the clockwise rotation in the high speed range.

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Rostami, Ali Bakhshandeh, i Antonio Carlos Fernandes. "Simulation of Fluttering and Autorotation Motion of Vertically Hinged Flat Plate". W ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41244.

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This paper is dedicated to the simulation of fluttering (oscillatory) and tumbling (rotational) phenomenon that may occur during the flow induced rotation in the water or air current. Fluttering is the oscillation of body about an axis and the tumbling, better called here as autorotation, is a name given to the case when the body turns continuously around the axis. This work describes the simulation of these phenomena by a nonlinear time domain code on freely rotating plate about a fixed vertical axis. The dimensional analysis proves that the rotational motion induced by flow is governed essentially by the dimensionless moment of inertia (I*) and Reynolds number. For Reynolds number less than 15000, plate experiences small amplitude fluttering motion that is independent of I*. It is shown that by increasing I* the fluttering bifurcates to autorotation, with a transition point that is approximately independent of Reynolds number and is such that I*=0.083.

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Yasuda, Takahiro. "Fluid-Dynamic Force Characteristics of an Auto Rotating Flat Plate". W ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37240.

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When a thin flat pate is released in still air, the plate automatically sets into a rotational motion. This phenomenon is called autorotation. The autorotating flat plate is loaded by unsteady fluid-dynamic forces. It is guessed that the forces are contributed by one due to vortex shedding from the edges of the plate and one due to the plate rotation, but the detail force characteristics have not been clear yet. In this study, we calculated the two types of flow by the discrete vortex method, one is flow around a rotating flat plate hinged about its center at constant rotating frequency in the uniform flow and the other is flow around a freely falling flat plate. The computed result in both types of flow agree well with the experiment. In the case of freely falling plate, autorotation phenomena could be predicted. By computed fluid dynamic forces, the contributions of vortex shedding from the plate to fluid dynamic forces and feedback effect of the fluid dynamic forces were found.

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Wu, Hong, Huichuan Cheng, Yulong Li i Shuiting Ding. "Experimental Study of Sister Hole Film Cooling Performance in a Rotating Flat Plate Model". W ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42188.

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Film cooling performance of a sister hole was investigated in a flat plate model by applying Thermochromic Liquid Crystal (TLC) technique under the stationary and rotating conditions. The flat plate model is installed in the test section. The sister hole include one main hole and two additional side holes with the smaller diameter in the spanwise direction. The diameter of the main hole is 4 mm and the injection angle is 30°. The density ratio of coolant to mainstream is 1.05. The Reynolds number (ReD) based on the velocity of mainstream and the diameter of the main hole are 2300, 3400 and 4500. Four rotational speeds of 200, 400, 600 and 800 rpm are conducted on both pressure side (trailing wall) and suction side (leading wall) with the blowing ratio varying from 0.14 to 3.5. The effects of blowing ratio, Reynolds number (ReD) and rotation number are mainly analyzed according to film coverage and film cooling effectiveness. The results show that the film performance firstly increases then decreases with the rising of blowing ratio, the optimal blowing ratio is about M=0.5. The film cooling performance is improved with higher Reynolds number (ReD). Under the rotation condition, the film trajectory has an obvious centrifugal deflection which can be enhanced by higher rotation number on the pressure side, and the film deflection moves a little centripetally on the suction side. The film cooling effectiveness on the suction side increases with the rising of rotation number and it is higher than that on the pressure side.

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Raporty organizacyjne na temat "Float Rotation"

Ficsher, Wolfram. Measurements of Helical Magnetic Fields Using Flat Rotating Coils. Office of Scientific and Technical Information (OSTI), maj 1996. http://dx.doi.org/10.2172/1119491.

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Fischer, W. Measurements of Helical Magnetic Fields Using Flat Rotating Coils. Office of Scientific and Technical Information (OSTI), maj 1996. http://dx.doi.org/10.2172/1149811.

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