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Literatura académica sobre el tema "The Low Gravity Man"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 5 de febrero de 2022

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Artículos de revistas sobre el tema "The Low Gravity Man"

Nath, Fred y Sam Galbraith. "The effect of mannitol on cerebral white matter water content". Journal of Neurosurgery 65, n.º 1 (julio de 1986): 41–43. http://dx.doi.org/10.3171/jns.1986.65.1.0041.

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✓ The authors have studied the effect of a low-dose (0.28 gm/kg) bolus infusion of mannitol on brain water in man. In eight patients with severe head injury, small pieces of subcortical white matter were taken at craniotomy both before and after infusion of mannitol. The tissue specific gravity was measured using a graduated specific-gravity column, and from it the brain water content was calculated. White matter specific gravity rose from a mean (± standard error of the mean) of 1.0325 ± 0.0012 before mannitol infusion to 1.0352 ± 0.0011 after mannitol administration, and the brain water content fell from a mean of 80.94% ± 2.5% to 75.28% ± 2.3%. The differences were significant (p < 0.01). This study shows that, after head injury in man, mannitol increases the white matter specific gravity and probably does so by reducing brain water.

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Y., Mr Deokate A., Prof Mundhe V. L. y Dr N. G. Narve. "Critical Time –Motion and Economic Analysis of Linear and Rotary Gravity Conveyor for application One man multi-machine setup as low cost automation in material handling". International Journal of Trend in Scientific Research and Development Volume-2, Issue-3 (30 de abril de 2018): 489–96. http://dx.doi.org/10.31142/ijtsrd10961.

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ANTONIADIS, I. "POSSIBLE LOW ENERGY MANIFESTATIONS OF STRINGS AND GRAVITY". International Journal of Modern Physics D 19, n.º 08n10 (agosto de 2010): 1339–50. http://dx.doi.org/10.1142/s0218271810017536.

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Lowering the string scale in the TeV region provides a theoretical framework for solving the mass hierarchy problem and unifying all interactions. The apparent weakness of gravity can then be accounted by the existence of large internal dimensions, in the submillimeter region, and transverse to a braneworld where our universe must be confined. The author reviews the main properties of this scenario and its implications for observations at both particle colliders, and in non-accelerator gravity experiments.

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Wardenaar, Floris, Carmen P. Ortega-Santos, Kaila Vento, Stephanie Olzinski, Jason Olig, Stavros Kavouras y Carol Johnston. "Reliability of 3 Urine Specific Gravity Meters for Measuring Brix and Urine Solutions at Different Temperatures". Journal of Athletic Training 56, n.º 4 (31 de marzo de 2021): 389–95. http://dx.doi.org/10.4085/1062-6050-0142.20.

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Context Urine specific gravity (USG) should be measured at room temperature (20°C), but the temperature of the sample is not always considered. Objective To evaluate the effect of sample temperature on the measurement accuracy of a digital refractometer (DIG), manual optical refractometer (MAN), and hydrometer (HYD). Design Descriptive laboratory study. Main Outcome Measure(s) Urine specific gravity. Results Experiment 1 (24 Brix (°Bx) samples) showed that measurements via the DIG and MAN did not differ from the reference, but HYD provided lower or inconsistent values compared with °Bx and was highly correlated with °Bx solutions (r, > = 0.89). The overall diagnostic ability of elevated USG cut-off values (≥1.020, ≥1.025, ≥1.030) was high for all tools (area under the curve >0.92). Misclassification of samples increased from 0 to 2 at 1.020 to 1 to 3 samples at cutoffs of 1.025 and 1.030 USG. Bland-Altman analysis showed that the DIG 5°C underreported slightly without reporting bias (r = −0.344, P = .13); all other plots for the DIG, MAN, and HYD showed considerably larger underreporting at higher concentrations (r = −0.21 to −0.97 with P >.02) at all temperatures. The outcomes of experiment 2 (33 fresh urine samples) using DIG 20°C as the standard demonstrated only negligible differences between the DIG and MAN at all temperatures but larger differences using the HYD. Conclusions All tools showed reporting bias compared with the °Bx solutions, which can affect the classification of low and high urine concentration at higher USG cutoff values, especially with a sample temperature of 37°C.

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Hauk, Markus y Roland Pail. "Gravity Field Recovery Using High-Precision, High–Low Inter-Satellite Links". Remote Sensing 11, n.º 5 (5 de marzo de 2019): 537. http://dx.doi.org/10.3390/rs11050537.

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Past temporal gravity field solutions from the Gravity Recovery and Climate Experiment (GRACE), as well as current solutions from GRACE Follow-On, suffer from temporal aliasing errors due to undersampling of the signal to be recovered (e.g., hydrology), which arise in terms of stripes caused by the north–south observation direction. In this paper, we investigate the potential of the proposed mass variation observing system by high–low inter-satellite links (MOBILE) mission. We quantify the impact of instrument errors of the main sensors (inter-satellite link and accelerometer) and high-frequency tidal and non-tidal gravity signals on achievable performance of the temporal gravity field retrieval. The multi-directional observation geometry of the MOBILE concept with a strong dominance of the radial component result in a close-to-isotropic error behavior, and the retrieved gravity field solutions show reduced temporal aliasing errors of at least 30% for non-tidal, as well as tidal, mass variation signals compared to a low–low satellite pair configuration. The quality of the MOBILE range observations enables the application of extended alternative processing methods leading to further reduction of temporal aliasing errors. The results demonstrate that such a mission can help to get an improved understanding of different components of the Earth system.

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Haworth, Thomas J., James Cadman, Farzana Meru, Cassandra Hall, Emma Albertini, Duncan Forgan, Ken Rice y James E. Owen. "Massive discs around low-mass stars". Monthly Notices of the Royal Astronomical Society 494, n.º 3 (7 de abril de 2020): 4130–48. http://dx.doi.org/10.1093/mnras/staa883.

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ABSTRACT We use a suite of smoothed particle hydrodynamic simulations to investigate the susceptibility of protoplanetary discs to the effects of self-gravity as a function of star–disc properties. We also include passive irradiation from the host star using different models for the stellar luminosities. The critical disc-to-star mass ratio for axisymmetry (for which we produce criteria) increases significantly for low-mass stars. This could have important consequences for increasing the potential mass reservoir in a proto Trappist-1 system, since even the efficient Ormel et al. formation model will be influenced by processes like external photoevaporation, which can rapidly and dramatically deplete the dust reservoir. The aforementioned scaling of the critical Md/M* for axisymmetry occurs in part because the Toomre Q parameter has a linear dependence on surface density (which promotes instability) and only an $M_*^{1/2}$ dependence on shear (which reduces instability), but also occurs because, for a given Md/M*, the thermal evolution depends on the host star mass. The early phase stellar irradiation of the disc (for which the luminosity is much higher than at the zero age main sequence, particularly at low stellar masses) can also play a key role in significantly reducing the role of self-gravity, meaning that even solar mass stars could support axisymmetric discs a factor two higher in mass than usually considered possible. We apply our criteria to the DSHARP discs with spirals, finding that self-gravity can explain the observed spirals so long as the discs are optically thick to the host star irradiation.

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Charbonnel, Corinne y Suzanne Talon. "Deep inside low-mass stars". Proceedings of the International Astronomical Union 4, S252 (abril de 2008): 163–74. http://dx.doi.org/10.1017/s1743921308022710.

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AbstractLow-mass stars exhibit, at all stages of their evolution, the signatures of complex physical processes that require challenging modeling beyond standard stellar theory. In this review, we recall the most striking observational evidences that probe the interaction and interdependence of various transport processes of chemicals and angular momentum in these objects. We then focus on the impact of atomic diffusion, large scale mixing due to rotation, and internal gravity waves on stellar properties on the main sequence and slightly beyond.

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Horst, L., P. V. F. Edelmann, R. Andrássy, F. K. Röpke, D. M. Bowman, C. Aerts y R. P. Ratnasingam. "Fully compressible simulations of waves and core convection in main-sequence stars". Astronomy & Astrophysics 641 (septiembre de 2020): A18. http://dx.doi.org/10.1051/0004-6361/202037531.

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Context. Recent, nonlinear simulations of wave generation and propagation in full-star models have been carried out in the anelastic approximation using spectral methods. Although it makes long time steps possible, this approach excludes the physics of sound waves completely and requires rather high artificial viscosity and thermal diffusivity for numerical stability. A direct comparison with observations is thus limited. Aims. We explore the capabilities of our compressible multidimensional Seven-League Hydro (SLH) code to simulate stellar oscillations. Methods. We compare some fundamental properties of internal gravity and pressure waves in 2D SLH simulations to linear wave theory using two test cases: (1) an interval gravity wave packet in the Boussinesq limit and (2) a realistic 3 M⊙ stellar model with a convective core and a radiative envelope. Oscillation properties of the stellar model are also discussed in the context of observations. Results. Our tests show that specialized low-Mach techniques are necessary when simulating oscillations in stellar interiors. Basic properties of internal gravity and pressure waves in our simulations are in good agreement with linear wave theory. As compared to anelastic simulations of the same stellar model, we can follow internal gravity waves of much lower frequencies. The temporal frequency spectra of velocity and temperature are flat and compatible with the observed spectra of massive stars. Conclusion. The low-Mach compressible approach to hydrodynamical simulations of stellar oscillations is promising. Our simulations are less dissipative and require less luminosity boosting than comparable spectral simulations. The fully-compressible approach allows for the coupling of gravity and pressure waves in the outer convective envelopes of evolved stars to be studied in the future.

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Zhang, Yan Yan y Cai Ying Chen. "Temperature Stress Analysis for Concrete Dam of Jiangya Hydropower Station". Applied Mechanics and Materials 556-562 (mayo de 2014): 683–86. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.683.

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Temperature is one of the main loads of concrete dam, adverse temperature load can lead to the dam body cracks, this paper study temperature load’s influence on concrete gravity dam. This paper use finite element method, it adopts finite element calculation software to establish concrete gravity dam’s finite element model of Jiangya hydropower station. Based on monitoring data of water temperature, air temperature, dam body temperature, foundation temperature about Jiangya hydropower station, calculates and analyzes temperature field of dam during operation period, researches stress variation law of dam under the influence of temperature field. The results showe that, temperature load has a great influence on the dam operation, but dam still meet code design requirements; when continuous high temperature during summer, dam should avoid operate under high water level; when continuous low temperature during winter, dam should avoid operate under low water level. Research results provide theoretical according for concrete gravity dam’s safe operation of Jiangya hydropower station.

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Bowman, D. M., C. Aerts, C. Johnston, M. G. Pedersen, T. M. Rogers, P. V. F. Edelmann, S. Simón-Díaz et al. "Photometric detection of internal gravity waves in upper main-sequence stars". Astronomy & Astrophysics 621 (enero de 2019): A135. http://dx.doi.org/10.1051/0004-6361/201833662.

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Context. Main sequence stars with a convective core are predicted to stochastically excite internal gravity waves (IGWs), which effectively transport angular momentum throughout the stellar interior and explain the observed near-uniform interior rotation rates of intermediate-mass stars. However, there are few detections of IGWs, and fewer still made using photometry, with more detections needed to constrain numerical simulations. Aims. We aim to formalise the detection and characterisation of IGWs in photometric observations of stars born with convective cores (M ≳ 1.5 M⊙) and parameterise the low-frequency power excess caused by IGWs. Methods. Using the most recent CoRoT light curves for a sample of O, B, A and F stars, we parameterised the morphology of the flux contribution of IGWs in Fourier space using an MCMC numerical scheme within a Bayesian framework. We compared this to predictions from IGW numerical simulations and investigated how the observed morphology changes as a function of stellar parameters. Results. We demonstrate that a common morphology for the low-frequency power excess is observed in early-type stars observed by CoRoT. Our study shows that a background frequency-dependent source of astrophysical signal is common, which we interpret as IGWs. We provide constraints on the amplitudes of IGWs and the shape of their detected frequency spectrum across a range of mass, which is the first ensemble study of stochastic variability in such a diverse sample of stars. Conclusions. The evidence of a low-frequency power excess across a wide mass range supports the interpretation of IGWs in photometry of O, B, A and F stars. We also discuss the prospects of observing hundreds of massive stars with the Transiting Exoplanet Survey Satellite (TESS) in the near future.

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Tesis sobre el tema "The Low Gravity Man"

Mackay, Paul. "Low energy quantum gravity". Thesis, University of Newcastle Upon Tyne, 2012. http://hdl.handle.net/10443/1752.

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This thesis investigates two very different aspects of quantum gravity. In the first - and main - section, we examine the question of quantum gravitational contributions to the running of a coupling parameter alongside the various problems and issues that this raises. We treat quantum gravity as an e ective eld theory and use perturbative methods to address issues. Speci cally, we look at a '4-type scalar coupling. In a gauge-invariant way, we consider a non-minimally coupled, massive scalar eld, with non-constant background, in the presence of a cosmological constant and contrary to most of the literature, we also calculate all derivative terms. An e ective action is constructed, renormalization counterterms calculated, and we nd that, within certain bounds, gravity leads to asymptotic freedom of scalar eld theory. Furthermore, we investigate whether considering quadratic divergences in gravitational calculations can tell us anything useful. In this case we nd non-vanishing quadratic divergences. However, we also recognise the possibility that quadratic divergences are somewhat of a red herring and that by suitable eld rede nitions, we can eliminate these from our calculations. The second section of the thesis addresses the possibility of super uidity in a quark gluon plasma. We use the framework of AdS/CFT, with knowledge of black hole thermodynamics, to consider the duality between a black hole in anti-de Sitter space and a uid existing on the boundary. Initially, we look at a simple case of a black hole possessing only mass and charge in AdS spacetime and calculate such properties as the entropy, temperature and speci c heat capacity, identifying a telltale sign of a phase change (speci c heat capacity tending to in nity) and of points of vanishing viscosity (corresponding with a zero entropy). After con rming that such a boundary exists, we take a di erent approach where we calculate and interpret the solutions to a relativistic Gross-Pitaevskii equation on a sphere. On projection back to R3, the solutions are seen to be tori, which we choose to interpret as vortex rings in analogy to the expected feature of those which are known to appear in a real super uids.

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Schmidt, Erin Stivers. "Electro-Drop Bouncing in Low-Gravity". PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4441.

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We investigate the dynamics of spontaneous jumps of water drops from electrically charged superhydrophobic dielectric substrates during a sudden step reduction in gravity level. In the brief free-fall environment of a drop tower, with a non-homogeneous external electric field arising due to dielectric surface charges (with surface potentials 0.4-1.8 kV), body forces acting on the jumped drops are primarily supplied by polarization stress and Coulombic attraction instead of gravity. This electric body force leads to a drop bouncing behavior similar to well-known phenomena in 1-g0, though occurring for much larger drops (~0.5 mL). We show a simple model for the phenomenon, its scaling, and asymptotic estimates for drop time of flight in two regimes: at short-times close to the substrate when drop inertia balances Coulombic force due to net free charge and image charges in the dielectric substrate and at long-times far from the substrate when drop inertia balances free charge Coulombic force and drag. The drop trajectories are controlled primarily by the dimensionless electrostatic Euler number Eu, which is a ratio of inertial to electrostatic forces. To experimentally determine values of Eu we conduct a series of drop tower experiments where we observe the effects of drop volume, net free charge, and static surface potential of the superhydrophobic substrate on drop trajectories. We use a direct search optimization to obtain a Maximum Likelihood Estimate for drop net charge, as we do not measure it directly in experiment. For φEu/8π > 1 drops escape the electric field, where φ is a drop to substrate aspect ratio. However, we do not observe any escapes in our dataset. With an eye towards engineering applications we consider the results in light of the so-called low-gravity phase separation problem with a worked example.

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Dando, Owen Robert. "Topological defects in low-energy string gravity". Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4496/.

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Cosmologists are interested in topological defects as a possible source for the primordial density perturbations which seeded structure formation through gravitational instability. In this thesis, the gravitational properties of various topological defects are studied in the context of low-energy string theory, a likely modification of Einstein gravity at the high energy scales prevalent in the early universe. We consider in turn global monopole, local monopole, global cosmic string and global texture defects, allowing for an arbitrary coupling of defects to the string theory dilaton. For global defects we find the following behaviour. If the dilaton is massless, this modification to general relativity generically destroys the global good behaviour of the monopole and cosmic string, making their spacetimes singular. For the texture non-singular spacetimes exist, but only for certain values of the matter-dilaton coupling, dependent on the gravitational strength of the defect; in addition, this non-singular behaviour exists only in a certain frame. In the case of a massive dilaton, the metric behaviour of these defects is similar to that found in Einstein gravity, though we find they generically induce a long-range dilaton cloud. For the local monopole, which we study only in the presence of a massless dilaton, a rich variety of behaviour is found. For particular parameter values the local monopole spacetime approximates that of an extremal dilaton black hole.

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Tomi, Leena Maija. "Studies of otolith-spinal adaptation to altered gravity performed in man". Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65511.

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Korsakova, Natalia [Verfasser]. "Probing low gravity gradient with LISA pathfinder / Natalia Korsakova". Hannover : Technische Informationsbibliothek (TIB), 2016. http://d-nb.info/1118740912/34.

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Wichiencharoen, Chugiat. "Recovery of 1⁰-mean anomalies in a local region from a low-low satellite to satellite tracking mission /". The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487262825074523.

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Veilleux, Douglas L. "Melting in a low gravity environment with applied electromagnetic fields /". View online ; access limited to URI, 2005. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3186925.

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Bokhour, Edward Bijan. "Energy absorption methods for fluid quantity gauging in low gravity". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/35942.

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Le, Nguyen Lan Phuong. "Effect of gravity on convective condensation at low mass velocity". Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30280/document.

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Les écoulements diphasiques sont couramment utilisés dans de nombreux domaines dont, en particulier, le domaine spatial. La performance de ces systèmes est entièrement régie par les couplages se produisant entre les écoulements et les transferts de chaleur. Cette particularité a conduit, depuis les dernières décennies, au développement de nombreuses études sur les écoulements diphasiques en microgravité. Afin d'accroître la connaissance sur le comportement thermo-hydraulique de ces systèmes thermiques, la présente étude se focalise sur l'étude de la condensation dans un mini-tube en présence ou non de la force gravitationnelle. Pour étudier l'effet de la gravité sur cette configuration, un premier modèle instationnaire d'écoulement diphasique a été développé. Parallèlement, une analyse des effets de la gravité sur l'hydrodynamique et les transferts thermique a été menée dans deux sections d'essai possédant un diamètre interne commun de 3,4 mm et des vitesses massiques faibles à modérées. La première étude a été réalisée au cours de la 62e campagne de vols paraboliques de l'ESA. Elle a été dédiée à la détermination des coefficients de transfert de chaleur quasi-locaux se produisant à l'intérieur d'un tube de cuivre. Afin de visualiser également les régimes d'écoulement présents, un tube en verre a été inséré au sein de cet échangeur. L'effet de la gravité sur les écoulements et les transferts a ainsi été déterminé. La seconde expérience, menée au sol, a porté sur l'étude d'un écoulement de vapeur descendant au sein d'un tube en saphir placé verticalement. Un protocole de mesure permettant d'obtenir simultanément l'épaisseur du film de liquide ruisselant et le coefficient d'échange local associé a été développé
Liquid-vapor two-phase flows have common applications in many fields including space thermal management systems. The performances of such systems are entirely associated to the coupling between thermal and hydrodynamic phenomena. Therefore, two-phase flows in microgravity condition have emerged as an active research area in the last decades. In order to complete the state of the art and to contribute to the increase in the knowledge of hydrothermal behavior of two-phase thermal management systems, the present study was conducted on convective condensation inside a mini tube, both in normal and micro gravity conditions. To analyze the effect of gravity on such flows, a preliminary transient modeling of the two-phase flow has been established. Simultaneously, an experimental investigation was carried out on the hydrodynamic and thermal behaviors of condensation flows in two test sections of 3.4 mm inner diameter at low and intermediate mass velocities. The first experiment was conducted during the 62nd ESA parabolic flights campaign. The test section was made with copper and allowed measurements of the quasi-local heat transfer coefficient. A glass tube was also inserted in the middle of the test section for the visualization of the two-phase flow regime. From this study, the changes in heat transfer coefficient and flow regime according to gravity variations were determined. The second experiment was carried out on ground in a sapphire tube installed vertically considering downward flow. The set-up was designed in order to measure simultaneously the local heat transfer coefficient and the thickness of the liquid film falling down along the tube wall

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Kaspi, Y., T. Guillot, E. Galanti, Y. Miguel, R. Helled, W. B. Hubbard, B. Militzer et al. "The effect of differential rotation on Jupiter's low-degree even gravity moments". AMER GEOPHYSICAL UNION, 2017. http://hdl.handle.net/10150/625195.

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The close-by orbits of the ongoing Juno mission allow measuring with unprecedented accuracy Jupiter's low-degree even gravity moments J(2), J(4), J(6), and J(8). These can be used to better determine Jupiter's internal density profile and constrain its core mass. Yet the largest unknown on these gravity moments comes from the effect of differential rotation, which gives a degree of freedom unaccounted for by internal structure models. Here considering a wide range of possible internal flow structures and dynamical considerations, we provide upper bounds to the effect of dynamics (differential rotation) on the low-degree gravity moments. In light of the recent Juno gravity measurements and their small uncertainties, this allows differentiating between the various models suggested for Jupiter's internal structure.

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Libros sobre el tema "The Low Gravity Man"

Myshkis, Anatolii D., Vitalii G. Babskii, Nikolai D. Kopachevskii, Lev A. Slobozhanin y Anatolii D. Tyuptsov. Low-Gravity Fluid Mechanics. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-70964-7.

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Ratke, Lorenz, Hannes Walter y Berndt Feuerbacher, eds. Materials and Fluids Under low Gravity. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/bfb0102508.

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High tide, low tide. Calgary: Weigl, 2008.

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Friedman, Robert. Fire safety in the low-gravity spacecraft environment. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 1999.

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Friedman, Robert. Fire safety in the low-gravity spacecraft environment. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 1999.

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Friedman, Robert. Fire safety in the low-gravity spacecraft environment. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 1999.

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Moore, Addison. Burning through gravity: A novel. [Place of publication not identified]: [CreateSpace Independent Publishing Platform], 2014.

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Simmons, Dan. Phases of gravity. Burton, MI: Subterranean, 2011.

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Antar, B. N. Fundamentals of low gravity fluid dynamics and heat transfer. Boca Raton: CRC Press, 1993.

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Kevi, L. The Quongering Gravity Low: 1:100000 Bouguer anomaly map. Perth: Geological Survey of Western Australia, 1992.

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Capítulos de libros sobre el tema "The Low Gravity Man"

Hargitai, Henrik. "Complex Crater (Low Gravity)". En Encyclopedia of Planetary Landforms, 1–4. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4614-9213-9_612-1.

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Hargitai, Henrik. "Complex Crater (Low Gravity)". En Encyclopedia of Planetary Landforms, 353–56. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-3134-3_612.

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Quadrelli, Bruno M. y Shyam Bhaskaran. "Navigation in Low Gravity". En Encyclopedia of Robotics, 1–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-642-41610-1_86-1.

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Myshkis, Anatolii D., Vitalii G. Babskii, Nikolai D. Kopachevskii, Lev A. Slobozhanin y Anatolii D. Tyuptsov. "Introduction". En Low-Gravity Fluid Mechanics, 1–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-70964-7_1.

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Myshkis, Anatolii D., Vitalii G. Babskii, Nikolai D. Kopachevskii, Lev A. Slobozhanin y Anatolii D. Tyuptsov. "Equilibrium Shapes of a Liquid". En Low-Gravity Fluid Mechanics, 16–119. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-70964-7_2.

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Myshkis, Anatolii D., Vitalii G. Babskii, Nikolai D. Kopachevskii, Lev A. Slobozhanin y Anatolii D. Tyuptsov. "Stability of Equilibrium States of a Liquid". En Low-Gravity Fluid Mechanics, 120–218. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-70964-7_3.

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Myshkis, Anatolii D., Vitalii G. Babskii, Nikolai D. Kopachevskii, Lev A. Slobozhanin y Anatolii D. Tyuptsov. "Bifurcation of Equilibrium States". En Low-Gravity Fluid Mechanics, 219–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-70964-7_4.

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Myshkis, Anatolii D., Vitalii G. Babskii, Nikolai D. Kopachevskii, Lev A. Slobozhanin y Anatolii D. Tyuptsov. "Small Oscillations of an Ideal Liquid". En Low-Gravity Fluid Mechanics, 276–348. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-70964-7_5.

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Myshkis, Anatolii D., Vitalii G. Babskii, Nikolai D. Kopachevskii, Lev A. Slobozhanin y Anatolii D. Tyuptsov. "Methods of Calculating Linear Oscillations of an Ideal Liquid". En Low-Gravity Fluid Mechanics, 349–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-70964-7_6.

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Myshkis, Anatolii D., Vitalii G. Babskii, Nikolai D. Kopachevskii, Lev A. Slobozhanin y Anatolii D. Tyuptsov. "Linear Oscillations of a Viscous Liquid". En Low-Gravity Fluid Mechanics, 392–461. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-70964-7_7.

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Actas de conferencias sobre el tema "The Low Gravity Man"

McQuillen, John, John Sankovic y Nancy Rabel Hall. "Multiphase Flow Separators in Reduced Gravity". En ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80764.

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Gas phase and liquid phase separation is necessary for one of two reasons. First, system-critical components are designed to specifically operate in a single phase mode only. Pumps, especially centrifugal pumps, lose their prime when gas bubbles accumulate in the impellor housing. Turbines and compressors suffer from erosion problems when exposed to vapor laden with liquid droplets. The second reason is that system performance can be significantly enhanced by operating in a single phase mode. The condensation heat transfer coefficient can be enhanced when the liquid of an entering two-phase stream is stripped thus permitting initial direct contact of the vapor with the cold walls of the condenser. High efficiency and low mass Environmental Control and Life Support Systems invariably require multiphase processes. These systems consist of water filtration and purification via bioreactors that encounter two phase flow at the inlets from drainage streams associated with the humidity condensate, urine, food processing, and with ullage bubble effluent from storage tanks. Entrained gases in the liquid feed, could have deleterious effects on the performance of many of these systems by cavitating pumps and poisoning catalytic packed bed bioreactors. Phase separation is required in thermal management and power systems whereby it is necessary to have all vapor entering the turbine and all liquid exiting the condenser and entering the pump in order to obtain the highest reliability and performance of these systems. Power systems which utilize Proton Exchange Membrane Fuel Cells generate a humidified oxygen exit stream whereby the water vapor needs to be condensed and removed to insure reliable and efficient system operation. Gas-liquid separation can be achieved by a variety of means in low gravity. Several active and passive techniques are examined and evaluated. Ideally, a system that functions well in all gravity environments that the system experiences is a requirement

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Ciortan, Cosmin, Helge Johnsgard, Olav Rognebakke, Eivind Ruth y Meg Overstake. "Squat and VIM Effects on a Towed Gravity-Based Structure With Low Under Bottom Clearance". En ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77093.

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Computational Fluid Dynamics (CFD) are used to predict the behavior of a massive Gravity-Based Structure (GBS) during open-water towing. Generally, it is poorly understood how the hydrodynamic interaction between the shaft (slender portion of the GBS structure at the waterline), free surface and caisson (lower, storage portion of the GBS) influences vortex shedding and potential VIM response. There is also limited ability to quantify the expected squat response of a structure of the substantial mass and bottom profile of a GBS being towed through areas of decreasing under bottom clearance. In order to properly capture all relevant physical effects, the Detached Eddy Simulations (DES) turbulence model is used. The resulting mesh is somewhat coarser and temporal resolution lower than in a previous study [1] which focused on accurate pitch and roll damping estimates. However, new physical decay test data confirm that the current model reproduces the damping in the relevant amplitude range. The planned towing speed results in reduced velocities for the shaft in the range where Vortex Induced Motions (VIM) typically occur. The numerical set-up is qualified by studying the shaft alone in a uniform current; self-sustained VIM is triggered, with behavior similar to known results. Two towing velocities and loading conditions are studied; a higher speed with a large under bottom clearance and a lower speed where the under bottom clearance is just a few meters. When no VIM is simulated for these conditions, a higher speed corresponding to the VIM range for the shaft is studied. Due to the presence of the caisson and the significant total mass of the GBS, no material VIM occurs. This is explained by a simplified one-degree of freedom model combining the excitation force on the shaft with the damping characteristics of the caisson and total GBS added mass and inertia. The simulations are also used to assess if large pitch or roll motions may be triggered.

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Masinde, Abiud, Cleophas Simiyu, Innocent Murunga, George Muia, Aaron Waswa y Justus Barongo. "A Preliminary Assessment of the Hydrocarbon Potential of Kerio Valley Basin: Gravity and Magnetic Interpretation". En SPE/AAPG Africa Energy and Technology Conference. SPE, 2016. http://dx.doi.org/10.2118/afrc-2546156-ms.

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ABSTRACT The aim of the study was to assess the hydrocarbon prospectivity of the Kerio Basin in the Kenya Rift. An Isostatically corrected anomaly map produced from a Bouguer anomaly grid was filtered using a Hanning low pass filter of order 2 to remove low wavelengths. Four profiles were extracted from the grid to give 1D interpretation along straight lines. Magnetic grid was corrected for IGRF, diurnal, filtered using a 1 Hz low pass 10km Hanning filter to reduce noise, later, reduced to equator to place all anomalies directly over underlying sources and make anomalies less complicated. Tilt derivative of the magnetic grid was used to estimate depth to basement. The residual analytic signal anomaly map derived from the magnetic grid was used to capture the response of existing near surface magnetic signatures even the reversely magnetized ones. Kerio basin is characterised by low gravity anomalies ranging between 35mGals to −100mGals related to variations in quantities of sediments deposited. Gravity profiles show that sediment thickness gradually increases to the south where we expect hydrocarbon accumulation. The magnetic anomaly map reveals low susceptibility rocks of between −20nT to −200nT to the south of the basin. Magnetic tilt depth indicates sediment thickness of 2.0-3.5Km above the basement. This corresponds to both gravity and magnetic interpretation of the same area. Integration of these data with seismic and other constraints may help gauge the hydrocarbon potential and reduce exploration uncertainty in the southern area of the Kerio Basin.

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Lawson, Anthony L. y Ramkumar N. Parthasarathy. "Linear Temporal Stability Analysis of a Low-Density Round Gas Jet Injected Into a High-Density Gas". En ASME 2002 Engineering Technology Conference on Energy. ASMEDC, 2002. http://dx.doi.org/10.1115/etce2002/cae-29010.

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It has been observed in previous experimental studies that round helium jets injected into air display a repetitive structure for a long distance, somewhat similar to the buoyancy-induced flickering observed in diffusion flames. In order to investigate the influence of gravity on the near-injector development of the flow, a linear temporal stability analysis of a round helium jet injected into air was performed. The flow was assumed to be isothermal and locally parallel; viscous and diffusive effects were ignored. The variables were represented as the sum of the mean value and a normal-mode small disturbance. An ordinary differential equation governing the amplitude of the pressure disturbance was derived. The velocity and density profiles in the shear layer, and the Froude number (signifying the effects of gravity) were the three important parameters in this equation. Together with the boundary conditions, an eigenvalue problem was formulated. Assuming that the velocity and density profiles in the shear layer to be represented by hyperbolic tangent functions, the eigenvalue problem was solved for various values of Froude number. The temporal growth rates and the phase velocity of the disturbances were obtained. The temporal growth rates of the disturbances increased as the Froude number was reduced (i.e. gravitational effects increased), indicating the destabilizing role played by gravity.

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Tong, Lili, Dandi Zhang, Liqiang Hou y Xiaoji Wang. "Experimental Study on Flow Instability During Gravity-Driven Reflooding". En 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81736.

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Due to the inherent safety characteristics of passive core injecting system, it is one of the most important mitigation strategies under loss of coolant accident (LOCA). However, flow instability during passive gravity-driven reflooding may occur, which can obstruct core reflooding process and reduce the heat removal rate from the reactor core. Therefore, exploring the characteristic and influencing mechanisms of flow instability during gravity-driven reflooding is necessary to analyze the effectiveness of passive core injecting system and mitigate the consequences of LOCA. In this work, small scale experiments are performed to investigate the flow instability during gravity-driven reflooding when the open ratio of steam outlet are in the ranges of 3.33–50%, gravity driving head are 16–20kPa and system pressure are 0.1–0.3MPa. The test facility consists of a cooling water storage tank, a test section and a condensate tank. The results show that flow instability could occur under specific conditions and have a strong regularity, which is divided into three stages: cooling water initial injection, cooling water expulsion and cooling water re-injection. In addition, the effects of open ratio of steam outlet, gravity driving head and system pressure on flow instability phenomenon are investigated. Increasing the open ratio of steam outlet accelerates the discharge rate of steam and prevents the accumulation of steam at the inner cylinder, which can contribute to cooling the heated rods and restrict the flow instability. And under low gravity driving head of 16kPa and low system pressure of 0.1MPa the temperature and pressure acutely change and flow instability is more likely to occur.

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Vedantam, Nanda Kishore y Ramkumar N. Parthasarathy. "Effects of Mean Flow Profiles on the Instability of a Low-Density Gas Jet Injected Into a High-Density Gas". En ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56794.

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The effects of the mean velocity profiles on the instability characteristics in the near-injector region of axisymmetric low-density gas jets injected vertically upwards into a high-density gas medium were investigated using linear inviscid stability analysis. The flow was assumed to be isothermal and locally parallel. Three velocity profiles, signifying different changes in the mean velocity in the shear layer, were used in the analysis. The effects of the inhomogeneous shear layer and the Froude number (signifying the effects of gravity) on the instability for each set of mean profiles were delineated. At a large Froude number (negligible gravity), a critical density ratio was found for the three profiles at which the jet became absolutely unstable. The critical density ratio for each velocity profile was increased as the Froude number was reduced. A critical Froude number was found for the three sets of profiles, below which the jet was absolutely unstable for all the density ratios less than unity, which demarcated the jet flow into the momentum-driven regime and the buoyancy-driven regime.

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Lai´n, Santiago, Martin Sommerfeld y Leonardo Botina. "Numerical Study of Horizontal Pneumatic Conveying of Powder in Different Gravitational Environments". En ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-12029.

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This paper evaluates the performance of horizontal pneumatic conveying under different gravity environments. An Euler-Lagrange approach validated versus ground experiments is employed to predict the relevant particle variables such as particle mass flux and mean conveying velocity in Lunar and micro-gravity conditions. Gravity reduced computations predict an increase of particle-wall collisions with the upper wall of the channel affecting greatly the particle mass flux profile in the case of low wall roughness and small particle mass loading. If gravitational settling is reduced, e.g. by means of higher wall roughness and/or higher particle mass loadings, particle mean conveying velocity is very similar in Earth and micro-gravity conditions.

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Mudde, Robert F. "Gravity Driven Bubbly Flows: The Role of Vortical Structures". En ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45672.

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Gravity driven bubbles are found in many industrial applications. Two typical reactors are the bubble column, in which the liquid is stagnant and the air lift reactor in which the liquid circulates, under the action of gravity, through the reactor. These reactors are attractive for a number of reasons: they have no moving parts and are thus low in maintenance; the size can be enormous (diameters of several meters, heights of tens of meters) allowing large volume flows to be processed; good mixing and heat transfer characteristics, etc. Our knowledge about the structure of the flow induced is rather limited. This makes design, fine tuning of operation and scale up still difficult. The two-phase flow in a bubble reactor is complicated. In the bubble columns, the liquid exhibits a large-scale circulation in a time averaged sense, with upward flow in the center and downward flow in the wall region. The first reliable data on this large-scale circulation date back to the work of Hills (174). In 1984, Franz et al. reported on the motion of what was later called vortical structures, eddy like structures (with sizes on the order of the column diameter) that move through the bubbly mixture. These vortical structures have been research more extensive during the last ten year by e.g. Fan and coworkers, Dudukovic and coworkers and Mudde & Van den Akker. The structures are found for a wide range of gas fractions, ranging from a few percent to well above 20%. The vortical structures seem to be a universal feature of the gravity driven bubble flows as they were also found in air lift reactors. For this reactor it has been reported that the liquid flow behaves more or less like the superposition of a net liquid flow and the complicated flow features found in the bubble column. The similarities will be high lighted. The vortical structures have important consequences for e.g. the (pseudo-)turbulence and the mixing in the bubbly flow. In 2-dimensional equipment they appear very regular and a separation between the low frequency fluctuations and the high frequency ‘turbulence’ is easily made. However, in 3-dimensional columns the situation is more complicated. LDA data show that the vortical structures are still responsible for a the occurrence of low frequency oscillations (on the order of 0.1Hz), but they are no longer appearing regularly and a separation of frequencies is no longer possible. Finally, the newest experiment seem to show that the vortical structures can be suppressed up to gas fraction of (at least) 10%. These new experiments suggest that the gravity driven bubbly flow is not inherently unstable, but rather sensitive to the conditions at the gas inlet.

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McKenna, John V. "Centrifuging Citrus Waste and Juice". En ASME 1986 Citrus Engineering Conference. American Society of Mechanical Engineers, 1986. http://dx.doi.org/10.1115/cec1986-3205.

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Dewatering and eliminating citrus waste treatment sludges has been a difficult and costly disposal problem for many years. One of the major drawbacks of the dewatering operation has been the extent of bound water that is associated with the sludge under gravity settlers, and its relatively low specific gravity difference as related to water. Under various operating conditions, especially in the south, some gravity settlers have been able to thicken the BOD solids to 1½ to 2% total solid concentration, but this also tends to present other operational problems due to low blanket turnover and does very little to solve the major problem of obtaining saleable by-product from this biological material. Paper published with permission.

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Frepoli, Cesare y Katsuhiro Ohkawa. "Void Fraction Predictions in Rod Bundles at Low-Pressure Low-Flow Conditions Based on Cunningham-Yeh Model". En 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49437.

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Many experiments have been conducted in the past with full-scale rod bundles to develop void fraction correlations or interfacial drag model which can be used to predict the mixture level in a reactor core following a postulated Loss of Coolant Accident (LOCA). The Cunningham and Yeh correlation was originally developed and validated with boil-off data obtained in the 100 to 400 psia pressure range. Subsequently the validity of the correlation was successfully assessed against several other experiments. However most of the data concentrated in the intermediate to high pressure range (from 100 to 2200 psia). More recently, the development of advanced passive plant such as the AP1000, put more emphasis in the level swell behavior in the near-atmospheric pressure conditions. Following a postulated SBLOCA event for the AP1000 design, the reactor vessel is automatically depressurized to a near atmospheric condition and in the long term the core decay heat is removed by gravity driven injection flow while boiling is occurring in the core. In this paper the Cunningham-Yeh correlation was assessed against data beyond its original data base. Cunningham-Yeh model predictions were compared to several low-flow, low-pressure full-scale rod bundle experiments. Results show that the correlation performs relatively well against low pressure test data. However the Cunningham-Yeh model has the tendency to underpredict the void fraction and therefore to provide conservative results of level swell for plant safety analysis.

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Informes sobre el tema "The Low Gravity Man"

Schmidt, Erin. Electro-Drop Bouncing in Low-Gravity. Portland State University Library, enero de 2000. http://dx.doi.org/10.15760/etd.6325.

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Bottone, Steven. Acoustic-Gravity Waves From Low-Altitude Localized Disturbances. Fort Belvoir, VA: Defense Technical Information Center, mayo de 1993. http://dx.doi.org/10.21236/ada264804.

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Lay, Erin Hoffmann. Ionospheric acoustic and gravity wave activity above low-latitude thunderstorms. Office of Scientific and Technical Information (OSTI), enero de 2017. http://dx.doi.org/10.2172/1341848.

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Rizzo, Thomas G. Using Scalars to Probe Theories of Low Scale Quantum Gravity. Office of Scientific and Technical Information (OSTI), marzo de 1999. http://dx.doi.org/10.2172/10016.

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Schmader, John R. Center of Gravity: The Critical Link in Strategic Planning for Low Intensity Conflict. Fort Belvoir, VA: Defense Technical Information Center, febrero de 1993. http://dx.doi.org/10.21236/ada263616.

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Bell, T. F., U. S. Inan, M. K. Demirkol, M. W. Chevalier y R. Moore. Very Low Frequency (VLF) Remote Sensing of Gravity Waves Generated by the Auroral Electrojet. Fort Belvoir, VA: Defense Technical Information Center, enero de 2002. http://dx.doi.org/10.21236/ada399159.

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Rizzo, Thomas G. Tests of Low Scale Gravity via Gauge Boson Pair Production in {gamma}{gamma} Collisions. Office of Scientific and Technical Information (OSTI), abril de 1999. http://dx.doi.org/10.2172/10201.

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Parker, Gary R. Jr, Matthew D. Holmes, Eric Mann Heatwole, Philip Rae y Peter Dickson. Falling Man Impact Experiments: The Response of Materials to Low Velocity Penetrating Impacts with Simulated Human Impact Dynamics. Office of Scientific and Technical Information (OSTI), mayo de 2013. http://dx.doi.org/10.2172/1079558.

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Rizzo, Thomas G. Tests of Low Scale Quantum Gravity in e{sup -}e{sup -} and {gamma}{gamma} Collisions. Office of Scientific and Technical Information (OSTI), julio de 1999. http://dx.doi.org/10.2172/10120.

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Rizzo, Thomas G. Top Quark Production at the Tevatron: Probing Anomalous Chromomagnetic Moments and Theories of Low Scale Gravity. Office of Scientific and Technical Information (OSTI), febrero de 1999. http://dx.doi.org/10.2172/9950.

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