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Articles de revues sur le sujet « Gravità intermedia »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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1

Bronner, R., F. Dreger-Jauffret et E. Pfirsch. « Lack of gravitropic response of tumour roots of Forsythia intermedia : cytological evidence for this behaviour ». Canadian Journal of Botany 65, no 1 (1 janvier 1987) : 143–49. http://dx.doi.org/10.1139/b87-020.

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Tumours of Forsythia intermedia Zab. consist of clusters of roots characterized by limited growth. These roots are agravitropic and have a nontypical cap without starch. Placed in moisture, the roots elongate in the same direction as they had on the plant, without any gravitropic curvature. Elongated roots have a caplike area, the cells of which exhibit amyloplasts. The absence of gravitropic response of the elongated roots was confirmed experimentally. Amyloplasts of the columella cells do not sediment in the direction of gravity, even after modification of the position of the root with respect to gravity. The reason for this agravitropism of Forsythia intermedia tumour roots is discussed in relation to their cytological features.
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Jang, Sujin, et E. Young Song. « Gravity with Intermediate Goods Trade ». East Asian Economic Review 21, no 4 (31 décembre 2017) : 295–315. http://dx.doi.org/10.11644/kiep.eaer.2017.21.4.332.

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Conconi, Paola, Glenn Magerman et Afrola Plaku. « The Gravity of Intermediate Goods ». Review of Industrial Organization 57, no 2 (11 juin 2020) : 223–43. http://dx.doi.org/10.1007/s11151-020-09762-2.

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Pethő, Ágnes. « The Vertigo of the Single Image : From the Classic Narrative “Glitch” to the Post-Cinematic Adaptations of Paintings ». Acta Universitatis Sapientiae, Film and Media Studies 6, no 1 (1 août 2013) : 65–90. http://dx.doi.org/10.2478/ausfm-2014-0005.

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Abstract As a possible cross section of cinematic narratology and the theory of intermediality the following essay assesses some of the effects of foregrounding the single, intermedial image within film. Specific figurations of intermediality that are experienced via the consciousness of single images, or some kind of “imageness” (i.e. as “intermedial references”) are presented as well as the modes in which they can interact with the narrative structure of a film. This interaction ranges from a momentary interference with the narrative structure of a film to disrupting it altogether; it may consist in constituting the gravity centre of a plot, or even in becoming the “canvas” for a palimpsest of narrative modes and narratives
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Angenent, S. B., et D. G. Aronson. « Intermediate asymptotics for convergent viscous gravity currents ». Physics of Fluids 7, no 1 (janvier 1995) : 223–25. http://dx.doi.org/10.1063/1.868722.

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Jamil, Mubasher, Davood Momeni et Ratbay Myrzakulov. « Warm Intermediate Inflation in F(T) Gravity ». International Journal of Theoretical Physics 54, no 4 (23 août 2014) : 1098–112. http://dx.doi.org/10.1007/s10773-014-2303-6.

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Greaney, Theresa M., et Kozo Kiyota. « The gravity model and trade in intermediate inputs ». World Economy 43, no 8 (25 mars 2020) : 2034–49. http://dx.doi.org/10.1111/twec.12947.

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LI, GUANGYU, et HAIBIN ZHAO. « CONSTRAINT ON INTERMEDIATE-RANGE GRAVITY FROM EARTH–SATELLITE AND LUNAR ORBITER MEASUREMENTS, AND LUNAR LASER RANGING ». International Journal of Modern Physics D 14, no 10 (octobre 2005) : 1657–66. http://dx.doi.org/10.1142/s0218271805007176.

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In the experimental tests of gravity, there have been considerable interests in the possibility of intermediate-range gravity. In this paper, we use the earth–satellite measurement of earth gravity, the lunar orbiter measurement of lunar gravity, and lunar laser ranging measurement to constrain the intermediate-range gravity from λ = 1.2 × 107 m –3.8 × 108 m . The limits for this range are α = 10-8–5 × 10-8, which improve previous limits by about one order of magnitude in the range λ = 1.2 × 107 m –3.8 × 108 m .
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Van Beeck, J., V. Prat, T. Van Reeth, S. Mathis, D. M. Bowman, C. Neiner et C. Aerts. « Detecting axisymmetric magnetic fields using gravity modes in intermediate-mass stars ». Astronomy & ; Astrophysics 638 (juin 2020) : A149. http://dx.doi.org/10.1051/0004-6361/201937363.

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Context. Angular momentum (AM) transport models of stellar interiors require improvements to explain the strong extraction of AM from stellar cores that is observed with asteroseismology. One of the frequently invoked mediators of AM transport are internal magnetic fields, even though their properties, observational signatures, and influence on stellar evolution are largely unknown. Aims. We study how a fossil, axisymmetric internal magnetic field affects period spacing patterns of dipolar gravity mode oscillations in main sequence stars with masses of 1.3, 2.0, and 3.0 M⊙. We assess the influence of fundamental stellar parameters on the magnitude of pulsation mode frequency shifts. Methods. We computed dipolar gravity mode frequency shifts due to a fossil, axisymmetric poloidal–toroidal internal magnetic field for a grid of stellar evolution models, varying stellar fundamental parameters. Rigid rotation was taken into account using the traditional approximation of rotation, and the influence of the magnetic field was computed using a perturbative approach. Results. We find magnetic signatures for dipolar gravity mode oscillations in terminal-age main sequence stars that are measurable for a near-core field strength larger than 105 G. The predicted signatures differ appreciably from those due to rotation. Conclusions. Our formalism demonstrates the potential for the future detection and characterization of strong fossil, axisymmetric internal magnetic fields in gravity-mode pulsators near the end of core-hydrogen burning from Kepler photometry, if such fields exist.
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Zaninović, Vinko. « Facilitating trade in intermediate goods ». Pomorstvo 36, no 2 (23 décembre 2022) : 271–78. http://dx.doi.org/10.31217/p.36.2.11.

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A side effect of economic globalisation and new information and communication technologies is the increasing fragmentation of the production process across different countries and continents, contributing to the rise of trade in intermediate goods, which has increased to almost 2/3 of total world trade. Most of this trade, i.e., intermediate goods, are transported by sea. Maritime trade is one of the most economical but also complex ways of trading and transporting goods, requiring good coordination, various stops and controls, transhipments, storage, ICT technology to track the cargo, etc. Therefore, the objective of this paper is to quantify the impact of trade facilitation on trade in intermediate goods on the sample of EU28 countries, using biennial data for the period 2010-2018. We estimate augmented gravity model on bilateral trade data using a Poisson Pseudo Maximum Likelihood (PPML) estimator. Our results suggest that, as expected, logistics, and in particular ICT development, has a significant and positive effect on trade in intermediate inputs, when controlling for other variables in the gravity model such as GDP of trading partners, distance, contiguity, existence of a free trade agreement, exchange rate, and common cultural proxies. Our results support the global trend of development and investment in logistics, and, in particular, new ICT technologies, which can not only contribute to the continued growth of trade in intermediates, but also help mitigate the negative effects of recent global economic shocks.
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Rabaey, G. F., et H. A. Hill. « The observed properties of the intermediate-degree gravity modes ». Astrophysical Journal 362 (octobre 1990) : 734. http://dx.doi.org/10.1086/169311.

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Sanyal, Abhik Kumar. « Intermediate Inflation or Late Time Acceleration ? » Advances in High Energy Physics 2008 (2008) : 1–16. http://dx.doi.org/10.1155/2008/630414.

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The expansion rate of “intermediate inflation” lies between the exponential and power law expansion but corresponding accelerated expansion does not start at the onset of cosmological evolution. Present study of “intermediate inflation” reveals that it admits scaling solution and has got a natural exit form it at a later epoch of cosmic evolution, leading to late time acceleration. The corresponding scalar field responsible for such feature is also found to behave as a tracker field for gravity with canonical kinetic term.
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Rameli, Nabilah, Marini Ramli, Zefarina Zulkafli, Mohd Nazri Hassan, Shafini Mohd Yusoff, Noor Haslina Mohd Noor, Suryati Hussin, Nor Khairina Mohamed Kamarudin, Yuslina Mat Yusoff et Rosnah Bahar. « Challenges in the Diagnosis of Beta-thalassemia Syndrome : The Importance of Molecular Diagnosis ». Oman Medical Journal 37, no 1 (31 janvier 2022) : e331-e331. http://dx.doi.org/10.5001/omj.2021.48.

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Patients with heterozygous β-thalassemia are generally asymptomatic. However, the intermediate phenotype is uncommon, and patients require further investigation to confirm the diagnosis. We describe a 32-year-old woman (gravida 3, para 2) with heterozygous β-thalassemia who presented with symptomatic anemia and had a history of frequent blood transfusion in each pregnancy. Physical examination was unremarkable. Laboratory results at presentation showed hypochromic microcytic anemia with reticulocytosis. Molecular study revealed intermedia phenotypes resulting from coinheritance of heterozygous β-globin chain mutation (IVS1-5) and a rare heterozygous α-globin triplication (αααanti-3.7). In this case report, we discuss the laboratory diagnostic approaches and the challenges faced in investigating this case.
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de Mello-Sampayo, Felipa. « Competing-destinations gravity model applied to trade in intermediate goods ». Applied Economics Letters 24, no 19 (26 janvier 2017) : 1378–84. http://dx.doi.org/10.1080/13504851.2017.1282109.

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Oikonomou, V. K. « On the expanding phase of a singular bounce and intermediate inflation : The modified gravity description ». Modern Physics Letters A 32, no 10 (27 mars 2017) : 1750067. http://dx.doi.org/10.1142/s0217732317500675.

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We demonstrate that the intermediate inflation scenario is a singular inflation cosmology, with the singularity at the origin t = 0 being a pressure and energy density singularity and particularly a Type III singularity. Also, we show that the expanding phase of a singular bounce can be identical to the intermediate inflation scenario, if the singular bounce has a Type III singularity at the origin. For the intermediate inflation scenario we examine the cosmological implications on the power spectrum in the context of various forms of modified gravity. Particularly, we calculate the power spectrum in the context of F(R), F(G) Gauss–Bonnet gravity and also for F(T) gravity and we discuss the viability of each scenario by comparing the resulting spectral index with the latest observational data.
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Abuselidze, George, et Gia Zoidze. « The Gravity of Cryptocurrency and Prospects in a Post-Pandemic Economy ». SHS Web of Conferences 126 (2021) : 04001. http://dx.doi.org/10.1051/shsconf/202112604001.

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Today, everything in the world is changing rapidly; businesses that ten years ago may not have existed at all now exist and bring with them a significant income. Change in almost every field has one key feature: it is digitalisation. There are innovations in payment methods as well; the most high-profile issue in recent years in this regard is the emergence of cryptocurrencies. Within a few years of its appearance, it has become popular not even locally but worldwide. The method of data processing and analysis, quantitative and qualitative research methods, statistical-economic analysis methods are mainly used when working on the paper. The research aims to identify the main directions of cryptocurrency development in globalisation threats and challenges. Most cryptocurrencies are built on blockchain technology. The technology of the future is designed to securely store information, expedite transactions, reduce international transaction costs, replace cb-money with e-money and eliminate intermediary circles.
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Ratnasingam, R. P., P. V. F. Edelmann et T. M. Rogers. « Onset of non-linear internal gravity waves in intermediate-mass stars ». Monthly Notices of the Royal Astronomical Society 482, no 4 (13 novembre 2018) : 5500–5512. http://dx.doi.org/10.1093/mnras/sty3086.

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Silverman, M. P. « Satellite test of intermediate-range deviation from Newton's law of gravity ». General Relativity and Gravitation 19, no 5 (mai 1987) : 511–14. http://dx.doi.org/10.1007/bf00760655.

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Lara, Martin. « LEO intermediary propagation as a feasible alternative to Brouwer’s gravity solution ». Advances in Space Research 56, no 3 (août 2015) : 367–76. http://dx.doi.org/10.1016/j.asr.2014.12.023.

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Varghese, A., R. P. Ratnasingam, R. Vanon, P. V. F. Edelmann et T. M. Rogers. « Chemical Mixing Induced by Internal Gravity Waves in Intermediate-mass Stars ». Astrophysical Journal 942, no 1 (1 janvier 2023) : 53. http://dx.doi.org/10.3847/1538-4357/aca092.

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Abstract Internal gravity waves can cause mixing in the radiative interiors of stars. We study this mixing by introducing tracer particles into 2D hydrodynamic simulations. Following the work of Rogers & McElwaine, we extend our study to different masses (3, 7, and 20 M ⊙) and ages (ZAMS, midMS, and TAMS). The diffusion profiles of these models are influenced by various parameters such as the Brunt–Väisälä frequency, density, thermal damping, the geometric effect, and the frequencies of waves contributing to these mixing profiles. We find that the mixing profile changes dramatically across age. In younger stars, we noted that the diffusion coefficient increases toward the surface, whereas in older stars the initial increase in the diffusion profile is followed by a decreasing trend. We also find that mixing is stronger in more massive stars. Hence, future stellar evolution models should include this variation. In order to aid the inclusion of this mixing in 1D stellar evolution models, we determine the dominant waves contributing to these mixing profiles and present a prescription that can be included in 1D models.
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Aerts, C., M. G. Pedersen et T. Van Reeth. « Measuring and Decoding Gravito-Inertial Modes in Intermediate- and High-Mass Stars ». Proceedings of the International Astronomical Union 14, S339 (novembre 2017) : 98–103. http://dx.doi.org/10.1017/s1743921318002314.

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AbstractThis talk discussed the basics of gravito-inertial asteroseismology as recently developed for stars born with a convective core. Photometric space missions originally built for exoplanet hunting, notably Kepler, have opened up the low-frequency regime of stellar oscillations and revealed a larger diversity in variability than anticipated prior to the era of high-precision space photometry. The talk explained the basics of forward seismic modelling based on gravito-inertial modes, which probe the deep stellar interior. It described how a hierarchical fitting approach allows us to derive the near-core rotation period, the amount and shape of convective core overshooting, and the level of chemical mixing in the radiative envelope for stars born with a convective core and burning hydrogen in their core. A summary of the current status, covering the mass range 1.4 ≲ M ≲ 5 M⊙, is provided here through references to numerous recent papers.
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Janssen, Peter A. E. M., et Miguel Onorato. « The Intermediate Water Depth Limit of the Zakharov Equation and Consequences for Wave Prediction ». Journal of Physical Oceanography 37, no 10 (1 octobre 2007) : 2389–400. http://dx.doi.org/10.1175/jpo3128.1.

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Abstract Finite-amplitude deep-water waves are subject to modulational instability, which eventually can lead to the formation of extreme waves. In shallow water, finite-amplitude surface gravity waves generate a current and deviations from the mean surface elevation. This stabilizes the modulational instability, and as a consequence the process of nonlinear focusing ceases to exist when kh < 1.363. This is a well-known property of surface gravity waves. Here it is shown for the first time that the usual starting point, namely the Zakharov equation, for deriving the nonlinear source term in the energy balance equation in wave forecasting models, shares this property as well. Consequences for wave prediction are pointed out.
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Shelikhov, A. P. « DETERMINATION OF THE VARIABLE DENSITY OF THE INTERMEDIATE LAYER WITHIN THE GUBAKHA AREA (PERMSKIY KRAI) ». Вестник Пермского университета. Геология 21, no 4 (2022) : 341–50. http://dx.doi.org/10.17072/psu.geol.21.4.341.

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Because of the improvement of instrumentation and technology progress in the conducting of gravity survey, there is a continuous increase in the accuracy of calculating the gravity Bouguer anomalies. At the same time, due to inadequate assessment of the intermediate layer density taken as a constant for reduction, the calculated anomalies may contain significant relative error. The article describes the experience of using the three-point formula of V.M. Berezkin to build a map of the areal distribution of the density of the intermediate layer and calculating, on its basis, anomalies in the Bouguer reduction according to high-precision gravimetric surveys at the Gubakha area.
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Melo, Lilian F., Givanildo Z. da Silva, Rita C. Panizzi et Cibele C. Martins. « Processing on the sanitary quality of seeds of Panicum maximum cv. ‘Tanzânia’ ». Revista Brasileira de Engenharia Agrícola e Ambiental 21, no 10 (octobre 2017) : 715–20. http://dx.doi.org/10.1590/1807-1929/agriambi.v21n10p715-720.

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ABSTRACT The aim of this study was to evaluate the sanitary quality of seeds of Panicum maximum cv. ‘Tanzânia’, following the several phases of the seed processing process. Seeds were sampled before processing and after leaving the air and screen machine (upper and intermediary screens and bottom); first gravity table (drift, upper and intermediate spouts); second gravity table (upper, intermediate, and lower spouts), and treating machine for dyeing the seeds. The sanitary analyses were conducted according to the filter paper method, with and without superficial disinfestation of the seeds, which were incubated at a temperature of 20 ± 2 °C with photoperiod of 12 h for seven days. Some seed processing steps may reduce the incidence of seeds of P. maximum cv. ‘Tanzania’ contaminated with Phoma sp. and Helminthosporium sp. In general, the processing can increase the incidence of seeds contaminated with Cladosporium sp. and Cercospora sp. The fungi Phoma sp., Helminthosporium sp., Penicillium sp., Cladosporium sp. and Cercospora sp. are found inside and outside the seeds and can be disseminated by the processing machines.
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Sivamohan, R., et E. Forssberg. « A review of the literature on intermediate and fine particle gravity concentration ». International Journal of Mineral Processing 15, no 3 (octobre 1985) : 155. http://dx.doi.org/10.1016/0301-7516(85)90031-6.

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Hyun, Hea-Jung. « Institutional quality and trade in intermediate goods ». Journal of Korea Trade 22, no 2 (4 juin 2018) : 162–86. http://dx.doi.org/10.1108/jkt-02-2018-0009.

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Purpose Recently published studies stress the importance of trade in intermediate goods. The literature on determinants of trade, however, have largely focused on the sources of comparative advantage in determining aggregate trade flows rather than trade in intermediate goods. The purpose of this paper is to examine the role of institutional quality and trade costs to explain the determinants of trade in intermediates. Design/methodology/approach The simple model is based on the model of comparative advantage in the gravity framework used by Eaton and Kortum (2002) and Chor (2010) to relate trade flows of intermediate goods to institutional parameters, factor endowments and geography. The empirical tests use a data set containing 172 countries and 17 industries spanning ten years. Findings The results confirm the theoretical prediction that a country with higher institutional quality has a comparative advantage in institution-intensive goods and trade costs have a negative effect on trade. The author further finds that these effects are stronger in share of trade in intermediate goods vis-à-vis final goods. Originality/value To highlight the distinct nature of trade in intermediate goods, the author separates industry trade flows as intermediate input trade and final goods (consumption goods) trade to compare the importance of different sources of comparative advantage among different types of trade flows. Unlike Eaton and Kortum (2002) and Chor (2010) who used cross-sectional data for final goods trade, the ten-year industry-level panel data are used to compare the relative importance of institutions and geography as determinants in trade in intermediate goods compared to final goods trade and capture the macroeconomic time variant factors as well as industry–country pair characteristics. A significant caveat in gravity regression is that an empirical finding may often be driven by omitted variables. Inclusion of a set of country variables such as GDP, production costs and institutional level may still allow omitted variables to bias the estimation. To avoid this problem, the author includes a fixed effect of exporter and importer as well as industry and year, instead of a set of country characteristics.
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Toscani, Martina, Giuseppe Lodato et Elena Maria Rossi. « Discovering intermediate massive black holes through tidally disrupted stars ». International Journal of Modern Physics D 28, no 14 (octobre 2019) : 1944015. http://dx.doi.org/10.1142/s0218271819440152.

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Stars are spheres of gas held together by self-gravity. When flying by a black hole, however, the star self-binding force can be overwhelmed by the black hole tides and the star can be torn apart. This is a physically rich and fascinating event which will be described by first introducing the concept of black hole from a mathematical point of view. We will then dive into the physics of the tidal disruption and proceed describing the accompanying electromagnetic flare and gravitational wave burst in the frequency range of the Laser Interferometer Space Antenna. This empowers such events to discover the elusive black holes with mass intermediate between the solar and the million/billion solar masses.
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Zhao, Xing. « Sewing the self : Art, needlework and Liu Beili’s intersectional identity ». Journal of Contemporary Chinese Art 9, no 1 (1 juillet 2022) : 113–31. http://dx.doi.org/10.1386/jcca_00058_1.

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As a Chinese-born woman living in the United States, Liu Beili is aware of the structurally, politically and representationally formulated intersectionality based on her national origin, ethnicity, language, gender and other factors. As a high-profile artist, Liu’s multimodal, polysemous and intermedial art reflects on the nuance that provides for understanding an intersectional immigrant’s sociocultural experience. Liu analogizes her femininity to water, which is resilient, and regards her art practices as the way to ‘better understand how migration and diaspora impact human experience through encounters and separations, displacements and assimilations, the intimacy of memories, and the gravity of time’. This article scrutinizes Liu’s relational art, social participation and civic engagement by focusing on three pieces of performance-based projects, all involving the traditionally feminine task of sewing. Through the simple act of sewing, Liu investigates multiple experiential discourses on the intersectional community: oppression, repression, displacement, disempowerment, self-empowerment, communication and reconciliation.
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Miles-Páez, P. A., M. R. Zapatero Osorio, E. Pallé et K. Peña Ramírez. « Optical and near-infrared linear polarization of low and intermediate-gravity ultracool dwarfs ». Monthly Notices of the Royal Astronomical Society 466, no 3 (19 décembre 2016) : 3184–98. http://dx.doi.org/10.1093/mnras/stw3278.

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Rees, Julia M., et William B. Zimmerman. « An intermediate wavelength, weakly nonlinear theory for the evolution of capillary gravity waves ». Wave Motion 48, no 8 (décembre 2011) : 707–16. http://dx.doi.org/10.1016/j.wavemoti.2011.03.006.

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Gondoin, P. « On the relation between rotation, convection and activity in intermediate-mass giants ». Proceedings of the International Astronomical Union 2, S239 (août 2006) : 154–56. http://dx.doi.org/10.1017/s1743921307000324.

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AbstractI found evidence that the X-ray surface flux of intermediate-mass G and K giants is correlated with their rotation period and Rossby number. Confidence in the degree of correlation is significantly higher when stellar gravity is taken into account. An empirical relation is found that accounts for the X-ray luminosity evolution of single intermediate-mass giants and giants in close or long-period binary systems, such as RS CVn-type systems, as they evolve off the main sequence towards the top of red giant branch.
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Lathers, Claire M., Peter H. Diamandis, Jeanne M. Riddle, Chiaki Mukai, Kay F. Elton, Michael W. Bungo et John B. Charles. « Acute and Intermediate Cardiovascular Responses to Zero Gravity and to Fractional Gravity Levels Induced by Head-Down or Head-Up Tilt ». Journal of Clinical Pharmacology 30, no 6 (juin 1990) : 494–523. http://dx.doi.org/10.1002/j.1552-4604.1990.tb03614.x.

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Joshi, M., M. Stringer, K. van der Wiel, A. O'Callaghan et S. Fueglistaler. « IGCM4 : a fast, parallel and flexible intermediate climate model ». Geoscientific Model Development Discussions 7, no 4 (15 août 2014) : 5517–45. http://dx.doi.org/10.5194/gmdd-7-5517-2014.

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Abstract. The IGCM4 (Intermediate Global Circulation Model version 4) is a global spectral primitive equation climate model whose predecessors have extensively been used in fields such as climate dynamics, processes modelling, and atmospheric dynamics. The IGCM4's niche and utility lies in its parallel spectral dynamics and fast radiation scheme. Moist processes such as clouds, evaporation, and soil moisture are simulated in the model, though in a simplified manner compared to state-of-the-art GCMs. The latest version has been parallelised, which has led to massive speed-up and enabled much higher resolution runs than would be possible on one processor. It has also undergone changes such as alterations to the cloud and surface processes, and the addition of gravity wave drag. These changes have resulted in a significant improvement to the IGCM's representation of the mean climate as well as its representation of stratospheric processes such as sudden stratospheric warmings. The IGCM4's physical changes and climatology are described in this paper.
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Nie, Deming, Limin Qiu et Xiaobin Zhang. « Direct numerical simulation of multiple interacting particles at intermediate Reynolds numbers ». International Journal of Numerical Methods for Heat & ; Fluid Flow 25, no 2 (2 mars 2015) : 202–13. http://dx.doi.org/10.1108/hff-04-2013-0138.

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Purpose – The purpose of this paper is to study the flow patterns and particle-particle collisions during the sedimentation of multiple circular particles under gravity at intermediate Reynolds numbers through direct numerical simulations (DNS). Design/methodology/approach – The previously developed lattice Boltzmann-direct forcing/fictitious domain (LB-DF/FD) method is adopted in this work to conduct DNS. Findings – It is found that the number of particle-particle collisions display a linear growth at long times after an initial evolution, resulting in a constant collision rate, which also depends the initial arrangement. Originality/value – The problem of particle-particle collisions during sedimentation with two kinds of particle density has not been considered before and it is of special importance in various industries.
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Van Reeth, T., J. S. G. Mombarg, S. Mathis, A. Tkachenko, J. Fuller, D. M. Bowman, B. Buysschaert et al. « Sensitivity of gravito-inertial modes to differential rotation in intermediate-mass main-sequence stars ». Astronomy & ; Astrophysics 618 (octobre 2018) : A24. http://dx.doi.org/10.1051/0004-6361/201832718.

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Context. While rotation has a major impact on stellar structure and evolution, its effects are not well understood. Thanks to high-quality and long-time base photometric observations obtained with recent space missions, we are now able to study stellar rotation more precisely.Aims. We aim to constrain radial differential rotation profiles inγDoradus (γDor) stars, and to develop new theoretical seismic diagnosis for such stars with rapid and potentially non-uniform rotation.Methods. We have derived a new asymptotic description which accounts for the impact of weak differential near-core rotation on gravity-mode period spacings. The theoretical predictions are illustrated from pulsation computations with the code GYRE and compared with observations ofγDor stars. When possible, we also derived the surface rotation rates in these stars by detecting and analysing signatures of rotational modulation, and computed the core-to-surface rotation ratios.Results. Stellar rotation must be strongly differential before its effects on period spacing patterns can be detected, unless multiple period spacing patterns can be compared. Six stars in our sample exhibit a single unexplained period spacing pattern of retrograde modes. We hypothesise that these are Yanai modes. Finally, we find signatures of rotational spot modulation in the photometric data of eight targets.Conclusions. If only one period spacing pattern is detected and analysed for a star, it is difficult to detect differential rotation. A rigidly rotating model will often provide the best solution. Differential rotation can only be detected when multiple period spacing patterns have been found for a single star or its surface rotation rate is known as well. This is the case for eight of the stars in our sample, revealing surface-to-core rotation ratios between 0.95 and 1.05.
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Teh, Lip H., et Benoit P. Gilbert. « A buckling model for the stability design of steel columns with intermediate gravity loads ». Journal of Constructional Steel Research 117 (février 2016) : 243–54. http://dx.doi.org/10.1016/j.jcsr.2015.10.019.

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Guzik, Joyce A., T. H. Morgan, N. J. Nelson, C. Lovekin, K. Kosak, I. N. Kitiashvili, N. N. Mansour et A. Kosovichev. « 2-D and 3-D models of convective turbulence and oscillations in intermediate-mass main-sequence stars ». Proceedings of the International Astronomical Union 11, A29B (août 2015) : 540–43. http://dx.doi.org/10.1017/s1743921316006086.

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AbstractWe present multidimensional modeling of convection and oscillations in main-sequence stars somewhat more massive than the Sun, using three separate approaches: 1) Using the 3-D planar StellarBox radiation hydrodynamics code to model the envelope convection zone and part of the radiative zone. Our goals are to examine the interaction of stellar pulsations with turbulent convection in the envelope, excitation of acoustic modes, and the role of convective overshooting; 2) Applying the spherical 3-D MHD ASH (Anelastic Spherical Harmonics) code to simulate the core convection and radiative zone. Our goal is to determine whether core convection can excite low-frequency gravity modes, and thereby explain the presence of low frequencies for some hybrid γ Dor/δ Sct variables for which the envelope convection zone is too shallow for the convective blocking mechanism to drive gravity modes; 3) Applying the ROTORC 2-D stellar evolution and dynamics code to calculate evolution with a variety of initial rotation rates and extents of core convective overshooting. The nonradial adiabatic pulsation frequencies of these nonspherical models are calculated using the 2-D pulsation code NRO. We present new insights into pulsations of 1-2 M⊙ stars gained by multidimensional modeling.
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Heifetz, Eyal, et Brian F. Farrell. « Generalized Stability of Nongeostrophic Baroclinic Shear Flow. Part II : Intermediate Richardson Number Regime ». Journal of the Atmospheric Sciences 64, no 12 (1 décembre 2007) : 4366–82. http://dx.doi.org/10.1175/2007jas2225.1.

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Abstract This work continues the generalized stability theory (GST) analysis of baroclinic shear flow in the primitive equations (PE), focusing on the regime in which the mean baroclinic shear and the stratification are of the same order. The Eady model basic state is used and solutions obtained using the PE are compared to quasigeostrophic (QG) solutions. Similar optimal growth is obtained in the PE and QG frameworks for eddies with horizontal scale equal to or larger than the Rossby radius, although PE growth rates always exceed QG growth rates. The primary energy growth mechanism is the conventional baroclinic conversion of mean available potential energy to perturbation energy mediated by the eddy meridional heat flux. However, for eddies substantially smaller than the Rossby radius, optimal growth rates in the PE greatly exceed those found in the QG. This enhanced growth rate in the PE is dominated by conversion of mean kinetic energy to perturbation kinetic energy mediated by the vertical component of zonal eddy momentum flux. This growth mechanism is filtered in QG. In the intermediate Richardson number regime mixed Rossby–gravity modes are nonorthogonal in energy, and these participate in the process of energy transfer from the barotropic source in the mean shear to predominantly baroclinic waves during the transient growth process. The response of shear flow in the intermediate Richardson number regime to spatially and temporally uncorrelated stochastic forcing is also investigated. It is found that a comparable amount of shear turbulent variance is maintained in the rotational and mixed Rossby–gravity modes by such unbiased forcing suggesting that any observed dominance of rotational mode energy arises from restrictions on the effective forcing and damping.
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Joshi, M., M. Stringer, K. van der Wiel, A. O'Callaghan et S. Fueglistaler. « IGCM4 : a fast, parallel and flexible intermediate climate model ». Geoscientific Model Development 8, no 4 (23 avril 2015) : 1157–67. http://dx.doi.org/10.5194/gmd-8-1157-2015.

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Abstract. The IGCM4 (Intermediate Global Circulation Model version 4) is a global spectral primitive equation climate model whose predecessors have extensively been used in areas such as climate research, process modelling and atmospheric dynamics. The IGCM4's niche and utility lies in its speed and flexibility allied with the complexity of a primitive equation climate model. Moist processes such as clouds, evaporation, atmospheric radiation and soil moisture are simulated in the model, though in a simplified manner compared to state-of-the-art global circulation models (GCMs). IGCM4 is a parallelised model, enabling both very long integrations to be conducted and the effects of higher resolutions to be explored. It has also undergone changes such as alterations to the cloud and surface processes and the addition of gravity wave drag. These changes have resulted in a significant improvement to the IGCM's representation of the mean climate as well as its representation of stratospheric processes such as sudden stratospheric warmings. The IGCM4's physical changes and climatology are described in this paper.
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Jiang, Tong, Ning Dai, Yungui Gong, Dicong Liang et Chao Zhang. « Constraint on Brans-Dicke theory from intermediate/extreme mass ratio inspirals ». Journal of Cosmology and Astroparticle Physics 2022, no 12 (1 décembre 2022) : 023. http://dx.doi.org/10.1088/1475-7516/2022/12/023.

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Abstract Intermediate/Extreme mass ratio inspiral (I/EMRI) system provides a good tool to test the nature of gravity in strong field. Based on the method of osculating orbits, we compute the orbital evolutions of I/EMRIs on quasi-elliptic orbits in both Einstein's general relativity and Brans-Dicke theory. The extra monopolar and dipolar channels in Brans-Dicke theory accelerate the orbital decay, so it is important to consider the effects of monopolar and dipolar emissions on the waveform. With the help of accurate orbital motion, we generate waveform templates which include both monopolar and dipolar contributions for I/EMRIs on eccentric orbits in Brans-Dicke theory. With a two-year observation of gravitational waves emitted from I/EMRIs by LISA, we get the most stringent constraint on the Brans-Dicke coupling parameter ω 0 > 106.
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Yang, Yixin, et Zejiong Zhou. « The Impact of Competition Policy Provisions in Regional Trade Agreements on Intermediate Product Trade ». Frontiers in Business, Economics and Management 6, no 3 (2 décembre 2022) : 7–12. http://dx.doi.org/10.54097/fbem.v6i3.3109.

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The deepening of the content of regional trade agreements has promoted the deep integration of global value chains. As an important part of the behind-the-border measures of regional trade agreements, competition policy provisions have an important impact on intermediate product trade. This paper constructs the depth index of competition policy provisions, uses the trade gravity model combined with Poisson's pseudo maximum likelihood estimation (PPML) and fixed effects to empirically analyze the impact of competition policy depth on the scale of intermediate product trade, and finally proposes policy recommendations for China to improve the construction level of regional trade agreements according to the conclusions.
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Fu, Ningning. « Innovation Efficiency and the Spatial Correlation Network Characteristics of Intelligent-Manufacturing Enterprises ». Complexity 2021 (11 novembre 2021) : 1–15. http://dx.doi.org/10.1155/2021/4299045.

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A data envelopment analysis cross-efficiency model was used to measure the innovation efficiency of Chinese intelligent-manufacturing (IM) enterprises. This paper took as samples the number of granted patents and R&D investments of IM enterprises listed from 2015 to 2020. This research used the modified gravity model to determine the innovation efficiency and the spatial correlation of IM enterprises in China and used UCINET software to reveal the innovation efficiency and spatial network characteristics of IM enterprises through a social network analysis. The study found that the relationship was significant and frequently close between innovation efficiency and the spatial correlation network of IM enterprises. The distribution of the spatial association network was “core-edge,” and IM enterprises in Eastern China were at the network core and mostly played an intermediary role. The spatial correlation network had four modules. The distribution of the enterprise innovation correlation was uneven within each module, amalgamation was poor among the subgroups, and characteristics of highly cohesive subgroups were present.
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Li, Xin, et Peng Zhang. « Northeast China Urban Network Structure and Reorganization Based on the Coordinated Development Capability of Cities ». Mathematical Problems in Engineering 2023 (9 janvier 2023) : 1–10. http://dx.doi.org/10.1155/2023/1282914.

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Urban synergy can be assessed based on the development of a given city and the organization and development channels between cities. Using the entropy method, correction gravity model, and social network analysis, our study conducted a comprehensive quantitative analysis of the characteristics of urban network space in three northeast provinces in China. The region exhibited a “core city-peripheral city-marginal city” concentric pattern, with the most developed cities at the core. Nevertheless, our findings indicate that a collaborative development pattern is gradually forming. The three northeastern provinces and urban collaboration networks extended further to the north. Liaoning Province, most of Jilin Province, and most of Heilongjiang Province have gradually established a similar development relationship with other cities. The overall level of urban intermediary centers in the northeastern provinces is declining, and the direct contact between cities is becoming more apparent. These findings, in addition to agglomeration calculations, highlight the need for reorganizing the current collaborative urbanization structure in northeast China.
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Xu, Xingjian, Jiangbin Liu, Fenghua Wei, Xianxiang Yang, Xiapin Li, Wei Zhang, Qingsang Pan et Zhengan Xiong. « Specific gravity and dropping speed in eggs ofOncomelania hupensis, a snail intermediate host of Schistosomiasis ». Molluscan Research 20, no 2 (janvier 2000) : 31–36. http://dx.doi.org/10.1080/13235818.2000.10673731.

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Ratnasingam, R. P., P. V. F. Edelmann et T. M. Rogers. « Two-dimensional simulations of internal gravity waves in the radiation zones of intermediate-mass stars ». Monthly Notices of the Royal Astronomical Society 497, no 4 (7 août 2020) : 4231–45. http://dx.doi.org/10.1093/mnras/staa2296.

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ABSTRACT Intermediate-mass main-sequence stars have large radiative envelopes overlying convective cores. This configuration allows internal gravity waves (IGWs) generated at the convective–radiative interface to propagate towards the stellar surface. The signatures of these waves can be observed in the photometric and spectroscopic data from stars. We have studied the propagation of these IGWs using two-dimensional (2D) fully non-linear hydrodynamical simulations with realistic stellar reference states from the 1D stellar evolution code, Modules for Stellar Astrophysics (mesa). When a single wave is forced, we observe wave self-interaction. When two waves are forced, we observe non-linear interaction (i.e. triadic interaction) between these waves forming waves at different wavelengths and frequencies. When a spectrum of waves similar to that found in numerical simulations is forced, we find that the surface IGW frequency slope is consistent with recent observations. This power law is similar to that predicted by linear theory for the wave propagation, with small deviations that can be an effect of non-linearities. When the same generation spectrum is applied to 3 M⊙ models at different stellar rotation and ages, the surface IGW spectrum slope is very similar to the generation spectrum slope.
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Barthelemy, X., M. L. Banner, W. L. Peirson, F. Fedele, M. Allis et F. Dias. « On a unified breaking onset threshold for gravity waves in deep and intermediate depth water ». Journal of Fluid Mechanics 841 (23 février 2018) : 463–88. http://dx.doi.org/10.1017/jfm.2018.93.

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We revisit the classical but as yet unresolved problem of predicting the breaking onset of 2D and 3D irrotational gravity water waves. Based on a fully nonlinear 3D boundary element model, our numerical simulations investigate geometric, kinematic and energetic differences between maximally tall non-breaking waves and marginally breaking waves in focusing wave groups. Our study focuses initially on unidirectional domains with flat bottom topography and conditions ranging from deep to intermediate depth (depth to wavelength ratio from 1 to 0.2). Maximally tall non-breaking (maximally recurrent) waves are clearly separated from marginally breaking waves by their normalised energy fluxes localised near the crest tip region. The initial breaking instability occurs within a very compact region centred on the wave crest. On the surface, this reduces to the local ratio of the energy flux velocity (here the fluid velocity) to the crest point velocity for the tallest wave in the evolving group. This provides a robust threshold parameter for breaking onset for 2D wave packets propagating in uniform water depths from deep to intermediate. Further targeted study of representative cases of the most severe laterally focused 3D wave packets in deep and intermediate depth water shows that the threshold remains robust. These numerical findings for 2D and 3D cases are closely supported by our companion observational results. Warning of imminent breaking onset is detectable up to a fifth of a carrier wave period prior to a breaking event.
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Boos, Jens, et Friedrich W. Hehl. « Gravity-Induced Four-Fermion Contact Interaction Implies Gravitational Intermediate W and Z Type Gauge Bosons ». International Journal of Theoretical Physics 56, no 3 (1 décembre 2016) : 751–56. http://dx.doi.org/10.1007/s10773-016-3216-3.

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Merchalov, S. V., V. I. Pryadkin, V. I. Orobinsky, A. V. Vorokhobin, V. V. Voronin et A. A. Smyshlyaev. « Construction for intermediate separation of ground grain in combined fodder production ». IOP Conference Series : Earth and Environmental Science 1052, no 1 (1 juillet 2022) : 012022. http://dx.doi.org/10.1088/1755-1315/1052/1/012022.

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Abstract The article provides research on a conical gravity separator with wedge-shaped separating channels expanding in the processed material's direction. Separation of the crushed grain material occurs due to the influence of the gravitational field and does not require additional energy consumption for the process itself. Energy is required to lift the processed material to a particular technological height. The use of wedge-shaped calibrating channels in the separator eliminates expensive frames, crank mechanisms, bearing assemblies and shafts, suspension, and drive mechanisms as in sieve mills. This circumstance reduces the cost and, at times, the metal consumption of the structure, the overall dimensions in comparison with other separating devices used for such an operation. The study of the proposed separator is based on several samples made with different angles of the cone Q, degrees, and dimensions of the wedge-shaped channel: initial width a-2; 2.5; 3mm; the final width is b-3; 4; 5 mm, the length of all channels is L-200 mm. The quality of the grinding products of the processed and finished fractions was evaluated by the coefficient of variation of the fractional composition Ɣ. During the research, the specific extraction of the through-feed fraction, the modulus of grinding of the initial product, the qualitative composition of the initial and finished product was determined by the coefficient of variation of the fractional composition Ɣ. Based on the results of the research, experimental dependencies were built, which made it possible to identify the following technological and design parameters of the separator: the optimal modulus of grinding of the processed raw materials, the load, the angle of the cone, at which the value of the specific recovery of the passage with constant dimensions of the wedge-shaped channel is of most significant importance. Studies have shown the high technical performance of the proposed separator: the specific extraction of finished fractions is up to 3000 kg/m2h at a taper angle Q = 54° ÷ 52° and a grinding module of the initial fraction M = 1.3 mm. The separator works stably at high loads P > 4 t / h. The coefficient of variation of the finished fraction is reduced to 12%, which increases its quality compared to the original. The obtained results of experimental studies confirm the feasibility of using the proposed gravity separator in collective and private farms and the industrial production of compound feed.
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Nie, Deming, Jianzhong Lin et Mengjiao Zheng. « Direct Numerical Simulation of Multiple Particles Sedimentation at an Intermediate Reynolds Number ». Communications in Computational Physics 16, no 3 (septembre 2014) : 675–98. http://dx.doi.org/10.4208/cicp.270513.130314a.

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AbstractIn this work the previously developed Lattice Boltzmann-Direct Forcing/ Fictitious Domain (LB-DF/FD) method is adopted to simulate the sedimentation of eight circular particles under gravity at an intermediate Reynolds number of about 248. The particle clustering and the resulting Drafting-Kissing-Tumbling (DKT) motion which takes place for the first time are explored. The effects of initial particle-particle gap on the DKT motion are found significant. In addition, the trajectories of particles are presented under different initial particle-particle gaps, which display totally three kinds of falling patterns provided that no DKT motion takes place, i.e. the concave-down shape, the shape of letter “M” and “in-line” shape. Furthermore, the lateral and vertical hydrodynamic forces on the particles are investigated. It has been found that the value of Strouhal number for all particles is the same which is about 0.157 when initial particle-particle gap is relatively large. The wall effects on falling patterns and particle expansions are examined in the final.
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Yanpei, C., P. Evesque, M. Hou, C. Lecoutre, F. Palencia et Y. Garrabos. « Long range boundary effect of 2D intermediate number density vibro-fluidized granular media in micro-gravity ». Journal of Physics : Conference Series 327 (6 décembre 2011) : 012033. http://dx.doi.org/10.1088/1742-6596/327/1/012033.

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