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Articoli di riviste sul tema "Gravity Model"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Kim, Juyoung, and Jeongsoo Kim. "Trade Area Analysis through Gravity Model." Journal of Channel and Retailing 26, no. 4 (2021): 49–72. http://dx.doi.org/10.17657/jcr.2021.10.31.3.

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2

Ševela, M. "Gravity-type model of Czech agricultural export." Agricultural Economics (Zemědělská ekonomika) 48, No. 10 (2012): 463–66. http://dx.doi.org/10.17221/5353-agricecon.

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Abstract (sommario):

The article concentrates on the application of gravity-type model to explain the volume of agro-exports from the Czech Republic. The multiplicative exponential function of the appropriate explanatory variables is used to describe the bilateral trade flows. Gross national product, gross national product per capita and geographical distance between the capitals of economies proved statistically significant. From regression analysis of the transformed data, there is apparent the positive correlation between the export volume of the commodity group 0 &ndash; Food and live animals SITC, rev.3 a

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3

Purnawan Jati, Slamet Sujud. "Studi Interaksi Masyarakat Masa Lampau Suatu Analisis Model Graviti (Gravity Model)." Berkala Arkeologi 19, no. 1 (1999): 78–88. http://dx.doi.org/10.30883/jba.v19i1.794.

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Pada kesempatan ini akan diintrodusir suatu model pendekatan dari Stephen Plog. Dalam hal ini, Plog mencoba mengintrodusir model graviti atau model gaya berat (gravity model) untuk memprediksi dengan akurat kuantitas interaksi antara desa-desa di suatu lembah tertentu. Plog akan membuktikan bahwa para ahli antropologi, sejarah, dan arkeologi dapat menguji hal yang dapat dipercaya dari ukuran interaksi mereka sendiri dengan menggunakan data dari masyarakat masa lampau. Model ini dilakukan dengan akurat dan bermanfaat, serta dapat dimodifikasi oleh penemuan-penemuan baru di masa lampau.

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4

Kruglov, Sergey. "Arctan-Gravity Model." Universe 1, no. 1 (2015): 82–91. http://dx.doi.org/10.3390/universe1010082.

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5

Pavlenko, Yu. "GRAVITY: THEORETICAL MODEL." TRANSBAIKAL STATE UNIVERSITY JOURNAL 28, no. 5 (2022): 120–29. http://dx.doi.org/10.21209/2227-9245-2022-28-5-120-129.

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A theoretical model of the formation of gravity and such dialectical categories as time, speed of light and intranuclear superdense matter, directly related to it, are presented. Categories are forms of knowledge reflection about the universal laws of the objective world, its unity, interaction and development of its components. Gravity is the main creative derivative of the potential energy of the Universe. This is a product of the process of interference of quantum wave fluctuations of potential energy and coherent wave oscillations of the quark-gluon energy mechanism of atomic nuclei. The c

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6

Anderson, James E. "The Gravity Model." Annual Review of Economics 3, no. 1 (2011): 133–60. http://dx.doi.org/10.1146/annurev-economics-111809-125114.

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7

Shah Zainal Abidin, Irwan, Muhammad Haseeb, Lee Wen Chiat, and Md Rabiul Islam. "Determinants of Malaysia – BRICS trade linkages: gravity model approach." Investment Management and Financial Innovations 13, no. 2 (2016): 389–98. http://dx.doi.org/10.21511/imfi.13(2-2).2016.14.

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The main objective of this study is to explore the long-run and short-run relationship between trade and other macroeconomic variables of Malaysian and the BRICS countries. To test relationship between trade and other macroeconomic variables, the empirical investigation will be conducted based on the dynamic ordinary least square (DOLS) and fully modify ordinary least square (FMOLS) model for the period 1980-2015. Results of both DOLS and FMOLS show that out of all the variables included in the model distance between Malaysia and BRICS countries and corruption of both side have negative affect

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8

Nerem, R. S., F. J. Lerch, J. A. Marshall, et al. "Gravity model development for TOPEX/POSEIDON: Joint Gravity Models 1 and 2." Journal of Geophysical Research 99, no. C12 (1994): 24421. http://dx.doi.org/10.1029/94jc01376.

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9

Isgаndаrov, E., and L. Jabizadeh. "DIGITAL MODELING OF GRAVITY ANOMALIES." POLISH JOURNAL OF SCIENCE, no. 61 (April 17, 2023): 25–32. https://doi.org/10.5281/zenodo.7835027.

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The article is devoted to digital modeling of gravity anomalies, the solution of which plays an important role in the geological interpretation of the observed anomalies in gravity prospecting. The object of study is the Zardab uplift, in the section of which Mesozoic volcanic-sedimentary deposits take part, which are well displayed in a gravity field. Using modern graphical tools such as SURFER and the software developed at the Department of Geophysics for processing and interpreting gravimetric anomalies, 2D and 3D maps of the surface of Mesozoic deposits, maps of the local gravity field and

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10

Poorooshasb, H. B. "One Gravity Model Testing." Soils and Foundations 35, no. 3 (1995): 55–59. http://dx.doi.org/10.3208/sandf.35.55.

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11

Mayo, Edward J., Lance P. Jarvis, and James A. Xander. "Beyond the gravity model." Journal of the Academy of Marketing Science 16, no. 3-4 (1988): 23–29. http://dx.doi.org/10.1007/bf02723355.

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12

Gorjup, Niko, and Amrit Sorli. "Vector model of gravity." Advanced Studies in Theoretical Physics 16, no. 4 (2022): 281–89. http://dx.doi.org/10.12988/astp.2022.91938.

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13

Dinasiri, A. S. K., and Y. Jayathunga. "Gravity Model Approach to Model Epidemic with Human Dispersal Behaviors." Communication in Biomathematical Sciences 7, no. 2 (2024): 232–48. https://doi.org/10.5614/cbms.2024.7.2.5.

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The gravity model which is based on Newton’s gravitational law, has been widely used as a spatial interaction model in the past few decades. Spatial interactions are important in epidemic modeling as different populations in the world are interconnected by them. Human dispersal behaviors are spatial interactions and they are crucial aspects of infectious disease spread. However, many existing compartmental models model epidemics in a single area. Hence, a gravity model approach to model epidemics incorporated with a multipatch compartmental model is studied here. Both human dispersal behaviors

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14

Westerlund, Joakim, and Fredrik Wilhelmsson. "Estimating the gravity model without gravity using panel data." Applied Economics 43, no. 6 (2011): 641–49. http://dx.doi.org/10.1080/00036840802599784.

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15

Nguyen, Hoang Nam. "FDI Determinants in Vietnam: Gravity Model Approach." American Based Research Journal 9, no. 5 (2020): 24–29. https://doi.org/10.5281/zenodo.3904357.

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<em>This paper uses the gravity model to examine a number of determinants affecting FDI attraction to Vietnam based on panel data from 10 biggest FDI partners of Vietnam for the period of 2005-2019. By using Pooled ordinary least square (OLS), random effect (RE) and fixed effect (FE) models, the empirical results show that the geographical distance, gross domestic product (GDP), gross domestic product per capita (GDP per capita), trade openness and labor costs significantly impact on FDI attraction. These results offer an insight to suggest some policy implications that will help promote more

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16

Indriyani, Popy Dwi, Rina Dwi Indriana, and La Ode M. Sabri. "Semarang Subsurface Model Using Airborne Gravity Data." International Journal of Research and Review 10, no. 9 (2023): 271–80. http://dx.doi.org/10.52403/ijrr.20230929.

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The city of Semarang faults became active again in the Quaternary era. The gravity method has been widely used to identify subsurface conditions in Semarang City and its surroundings, especially the satellite gravity method and land gravity methods. Meanwhile, Semarang City and its surroundings have never used the airborne gravity method. Therefore, this study aims to identify subsurface conditions, especially faults, using airborne gravity data in Semarang and its surroundings. The airborne gravity value is the gravity value at a certain height. Therefore, in this study, the downward continua

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17

ETEJE, SYLVESTER OKIEMUTE, Olujimi Fatai Oduyebo, and Matthew N. Ono. "Derivation of Theoretical Gravity Model on the Clarke 1880 Ellipsoid for Practical Local Geoid Model Determination." Scientific Research Journal (SCIRJ) 7, no. 2 (2019): 12–19. https://doi.org/10.31364/SCIRJ/v7.i2.2019.P0219612.

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Abstract: The application of gravity anomalies for gravimetric geoid model determination has necessitated the computation of normal gravity on the WGS 84 ellipsoid using the International Gravity Formula. For local gravimetric geoid model determination, the gravity anomalies are computed on the local ellipsoid adopted for geodetic computation in the area/region of study. To determine precise local gravimetric geoid model in countries where Clarke 1880 ellipsoid is adopted for geodetic computation, the theoretical gravity must be computed on the adopted geodetic computation surface. As a result

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18

Tao, Zhuolin, Qingjing Zheng, and Hui Kong. "A Modified Gravity p-Median Model for Optimizing Facility Locations." Journal of Systems Science and Information 6, no. 5 (2018): 421–34. http://dx.doi.org/10.21078/jssi-2018-421-14.

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AbstractThe gravityp-median model is an important improvement to the widely-usedp-median model. However, there is still a debate on its validity in empirical applications. Previous studies even doubt the significance of the gravityp-median model. Using a case study of tertiary hospitals in Shenzhen, China, this study re-examines the difference between the gravityp-median model with thep-median model, by decomposing the difference between the two models into gravity rule and variant attraction. This study also proposes a modified gravityp-median model by incorporating a distance threshold. The

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19

Kitching, T. D., F. Simpson, A. F. Heavens, and A. N. Taylor. "Model selection for modified gravity." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, no. 1957 (2011): 5090–101. http://dx.doi.org/10.1098/rsta.2011.0287.

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In this article, we review model selection predictions for modified gravity scenarios as an explanation for the observed acceleration of the expansion history of the Universe. We present analytical procedures for calculating expected Bayesian evidence values in two cases: (i) that modified gravity is a simple parametrized extension of general relativity (GR; two nested models), such that a Bayes' factor can be calculated, and (ii) that we have a class of non-nested models where a rank-ordering of evidence values is required. We show that, in the case of a minimal modified gravity parametrizati

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20

Shahriar, Saleh, Lu Qian, Sokvibol Kea, and Nazir Muhammad Abdullahi. "The gravity model of trade." Review of innovation and competitiveness 5, no. 1 (2019): 21–42. http://dx.doi.org/10.32728/ric.2019.51/2.

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Purpose. The purpose of this study is to trace the theoretical developments of the gravity model of trade. The key question is: what are the dominant features of the development of the gravity trade model? Methodology. This research is conducted by employing a number of methods that include the historical, descriptive and analytical methods. The main contribution of this paper is to trace the historical and theoretical development phases of the gravity model. Findings. This study is a novel attempt in terms of the identification of the four distinctive phases of the development of the gravity

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21

Vixo, Darcy, and Gerry Connard. "Isostatic Gravity Inversion: a new way to model gravity data." First Break 38, no. 5 (2020): 43–51. http://dx.doi.org/10.3997/1365-2397.fb2020033.

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22

Catalao, J. "Iberia-Azores Gravity Model (IAGRM) using multi-source gravity data." Earth, Planets and Space 58, no. 3 (2006): 277–86. http://dx.doi.org/10.1186/bf03351924.

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23

Kochnev, V. A. "Kinematic-gravity model of geodynamo." Geofizicheskiy Zhurnal 35, no. 4 (2013): 3–15. http://dx.doi.org/10.24028/gzh.0203-3100.v35i4.2013.111381.

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24

Chang, Lay Nam, and Chopin Soo. "Standard model with gravity couplings." Physical Review D 53, no. 10 (1996): 5682–91. http://dx.doi.org/10.1103/physrevd.53.5682.

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25

Ord, G. N. "Gravity and the spiral model." Chaos, Solitons & Fractals 10, no. 2-3 (1999): 499–512. http://dx.doi.org/10.1016/s0960-0779(98)00255-0.

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26

Matone, Marco. "Nonperturbative model of Liouville gravity." Journal of Geometry and Physics 21, no. 4 (1997): 381–98. http://dx.doi.org/10.1016/s0393-0440(96)00028-9.

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27

Burša, Milan, and M. Pick. "Normal gravity model of phobos." Studia Geophysica et Geodaetica 33, no. 2 (1989): 109–16. http://dx.doi.org/10.1007/bf01646578.

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28

Drezner, Tammy, and Zvi Drezner. "The gravity p-median model." European Journal of Operational Research 179, no. 3 (2007): 1239–51. http://dx.doi.org/10.1016/j.ejor.2005.04.054.

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29

Gogberashvili, M. Y. "Tensor-tensor model of gravity." Theoretical and Mathematical Physics 113, no. 3 (1997): 1572–81. http://dx.doi.org/10.1007/bf02634517.

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30

Lewer, Joshua J., and Hendrik Van den Berg. "A gravity model of immigration." Economics Letters 99, no. 1 (2008): 164–67. http://dx.doi.org/10.1016/j.econlet.2007.06.019.

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31

Tapley, B. D., M. M. Watkins, J. C. Ries, et al. "The Joint Gravity Model 3." Journal of Geophysical Research: Solid Earth 101, B12 (1996): 28029–49. http://dx.doi.org/10.1029/96jb01645.

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32

Dimitrijevic, Marija, and Voja Radovanovic. "SO(2,3) noncommutative gravity model." Facta universitatis - series: Physics, Chemistry and Technology 12, no. 2 (2014): 111–16. http://dx.doi.org/10.2298/fupct1402111d.

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In this paper the noncommutative gravity is treated as a gauge theory of the noncommutative SO(2,3)* group, while the noncommutativity is canonical. The Seiberg-Witten (SW) map is used to express noncommutative fields in terms of the corresponding commutative fields. The commutative limit of the model is the Einstein-Hilbert action plus the cosmological term and the topological Gauss-Bonnet term. We calculate the second order correction to this model and obtain terms that are zeroth, first, . . . and fourth power of the curvature tensor. Finally, we discuss physical consequences of those corre

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33

Gegenberg, Jack, and Viqar Husain. "Solvable model for quantum gravity?" Classical and Quantum Gravity 30, no. 6 (2013): 065023. http://dx.doi.org/10.1088/0264-9381/30/6/065023.

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34

Slronge, William B., and Ronald R. Schultz. "Heteroscedasticity and the Gravity Model." Geographical Analysis 10, no. 3 (2010): 279–86. http://dx.doi.org/10.1111/j.1538-4632.1978.tb00657.x.

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35

Aghamohammadi, A. "Holographic f(T) gravity model." Astrophysics and Space Science 352, no. 1 (2014): 1–5. http://dx.doi.org/10.1007/s10509-014-1912-0.

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36

Zhukov, V. P., R. A. Shorin, V. E. Mizonov, and Kh Otvinovski. "Entropy model of gravity classification." Theoretical Foundations of Chemical Engineering 34, no. 4 (2000): 370–72. http://dx.doi.org/10.1007/bf02758687.

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37

Anna Myalkina, Anna Myalkina, and Choong-Bae Lee. "Investigating Import Determinants of Russian Crude Oil: A Gravity Model Approach." Korea Association for International Commerce and Information 26, no. 3 (2024): 97–121. http://dx.doi.org/10.15798/kaici.2024.26.3.97.

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Russia is a major global exporter of crude oil. Due to its unique geographic, political, and economic factors, Russia's crude oil exports exhibit distinct characteristics compared to those of other oil-exporting countries. This study aims to identify the key factors influencing Russia's crude oil trade and analyze their impact on this trade. Using a gravity model, the study utilizes panel data on crude oil imports from 31 major importers from 2007 to 2022. Regression analysis integrates macroeconomic, logistical, and geopolitical variables to determine the influencing factors of Russia's crude

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38

Zhou, Xiao, Gongliu Yang, Jing Wang, and Zeyang Wen. "A Combined Gravity Compensation Method for INS Using the Simplified Gravity Model and Gravity Database." Sensors 18, no. 5 (2018): 1552. http://dx.doi.org/10.3390/s18051552.

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39

TKACH, V. I. "TOWARDS GHOST-FREE GRAVITY AND STANDARD MODEL." Modern Physics Letters A 27, no. 22 (2012): 1250131. http://dx.doi.org/10.1142/s0217732312501313.

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This paper presents a new higher derivative gravity which in spontaneous breaking electroweak symmetry state does not have ghost in gravity sector. We show that Newton constant of the gravity and dark energy density depend on the fundamental TeV scale and the coupling constant at the quadratic curvature term. We consider the supersymmetric extension of this model.

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40

Xu, Xinyu, Yongqi Zhao, Tilo Reubelt, and Robert Tenzer. "A GOCE only gravity model GOSG01S and the validation of GOCE related satellite gravity models." Geodesy and Geodynamics 8, no. 4 (2017): 260–72. http://dx.doi.org/10.1016/j.geog.2017.03.013.

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41

Horikoshi, Masaatsu, Yugo Abe, and Takeo Inami. "Gravity Loop Corrections to the Standard Model Higgs in Einstein Gravity." Communications in Physics 26, no. 3 (2017): 229. http://dx.doi.org/10.15625/0868-3166/26/3/9033.

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We study one-loop quantum gravity corrections to the standard model Higgs potential \(V(\phi) \grave{\rm a}\) la Coleman-Weinberg and examine the stability question of \(V(\phi) \) in the energy region of Planck mass scale, \(\mu\simeq M_{\rm Pl}\) \((M_{\rm Pl}=1.22\times10^{19}{\rm GeV})\). We calculate the gravity one-loop corrections to \(V(\phi)\) in Einstein gravity by using the momentum cut-off \(\Lambda\). We have found that even small gravity corrections compete with the standard model term of \(V(\phi)\) and affect the stability argument of the latter part alone. This is because the

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42

Kvas, Andreas, Jan Martin Brockmann, Sandro Krauss, et al. "GOCO06s – a satellite-only global gravity field model." Earth System Science Data 13, no. 1 (2021): 99–118. http://dx.doi.org/10.5194/essd-13-99-2021.

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Abstract. GOCO06s is the latest satellite-only global gravity field model computed by the GOCO (Gravity Observation Combination) project. It is based on over a billion observations acquired over 15 years from 19 satellites with different complementary observation principles. This combination of different measurement techniques is key in providing consistently high accuracy and best possible spatial resolution of the Earth's gravity field. The motivation for the new release was the availability of reprocessed observation data for the Gravity Recovery and Climate Experiment (GRACE) and Gravity f

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43

Siddiqi, Mohd Danish, Sudhakar K. Chaubey, and Mohammad Nazrul Islam Khan. "f(R,T)-Gravity Model with Perfect Fluid Admitting Einstein Solitons." Mathematics 10, no. 1 (2021): 82. http://dx.doi.org/10.3390/math10010082.

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f(R,T)-gravity is a generalization of Einstein’s field equations (EFEs) and f(R)-gravity. In this research article, we demonstrate the virtues of the f(R,T)-gravity model with Einstein solitons (ES) and gradient Einstein solitons (GES). We acquire the equation of state of f(R,T)-gravity, provided the matter of f(R,T)-gravity is perfect fluid. In this series, we give a clue to determine pressure and density in radiation and phantom barrier era, respectively. It is proved that if a f(R,T)-gravity filled with perfect fluid admits an Einstein soliton (g,ρ,λ) and the Einstein soliton vector field ρ

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Mroczek, Katarzyna, Tomasz Tokarski, and Mariusz Trojak. "Gravity Model of the Economic Diversity of Polish Regions." Gospodarka Narodowa 271, no. 3 (2014): 5–34. http://dx.doi.org/10.33119/gn/100867.

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45

Sabri, L. M., Susilo Susilo, Dadan Ramdani, Firman Hadi, and Yasser Wahyuddin. "Effect of Adding Global Geopotential Model Generated Data to Terrestrial Data on Geoid Model (case study at Bekasi, Indonesia)." IOP Conference Series: Earth and Environmental Science 1276, no. 1 (2023): 012016. http://dx.doi.org/10.1088/1755-1315/1276/1/012016.

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Abstract Geoid modeling requires accurate and evenly distributed gravity data throughout the study area. Although airborne gravity measurements are getting more massive, some areas are politically restricted areas. Therefore, terrestrial measurements are still needed, such as in Bekasi City and its surroundings. In terrestrial geoid modeling, ideal conditions are often difficult to achieve, because terrestrial measurements can only be made in accessible, safe, and permitted places. These non-ideal conditions result in an uneven distribution of data which can decrease in the accuracy of the res

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Chen, Y., Q. Guo, M. Liu, and J. G. Liu. "Improved gravity model for identifying the influential nodes." Europhysics Letters 136, no. 6 (2021): 68004. http://dx.doi.org/10.1209/0295-5075/ac49d1.

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Abstract Identifying the influential nodes in a network is essential for network dynamic analysis. In this letter, inspired by the gravity model, we present an improved gravity model (EDGM) to identify the influential nodes in the network through the effective distance. Firstly, we calculate the degree of nodes. Then we construct the effective distance combined with the interaction frequency between nodes, so as to establish the effective distance gravity model. Comparing with the susceptible-infected model, the results show that Kendall's τ correlation coefficient of the EDGM could be enhance

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47

Borghi, Alessandra, Riccardo Barzaghi, Omar Al-Bayari, and Suhail Al Madani. "Centimeter Precision Geoid Model for Jeddah Region (Saudi Arabia)." Remote Sensing 12, no. 12 (2020): 2066. http://dx.doi.org/10.3390/rs12122066.

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In 2014, the Jeddah Municipality made a call for an estimate of a centimetric precision geoid model to be used for engineering and surveying applications, because the regional geoid model available at that time did not reach a sufficient precision. A project was set up to this end and dedicated sets of gravity and Global Positioning System (GPS)/levelling data were acquired in the framework of this project. In this paper, a thorough analysis of these newly acquired data and of the last available Global Gravity Field Models (GGMs) has been done in order to obtain a geoid undulation estimate wit

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48

KANEDA, SHO, SERGEI V. KETOV, and NATSUKI WATANABE. "FOURTH-ORDER GRAVITY AS THE INFLATIONARY MODEL REVISITED." Modern Physics Letters A 25, no. 32 (2010): 2753–62. http://dx.doi.org/10.1142/s0217732310033918.

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We revisit the old (fourth-order or quadratically generated) gravity model of Starobinsky in four spacetime dimensions, and derive the (inflaton) scalar potential in the equivalent scalar–tensor gravity model. The inflaton scalar potential is used to compute the (CMB) observables of inflation, associated with curvature perturbations (namely, the scalar and tensor spectral indices, and the tensor-to-scalar ratio), including the new next-to-leading order terms with respect to the inverse number of e-foldings. The results are compared to the recent (WMAP5) experimental bounds. We confirm both mat

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Ruprecht, Daniel, and Rupert Klein. "A model for nonlinear interactions of internal gravity waves with saturated regions." Meteorologische Zeitschrift 20, no. 2 (2011): 243–52. http://dx.doi.org/10.1127/0941-2948/2011/0213.

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Okhotnikov, Alexander, Muhammad Imtiaz Subhani, Shatila Khodor, and Denis Ushakov. "Gravity model and Pakistan - China Trade." E3S Web of Conferences 258 (2021): 06036. http://dx.doi.org/10.1051/e3sconf/202125806036.

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Abstract (sommario):

Pakistan being an important ally of the war against terror paying huge price of not merely of innocent lives of people but huge monetary losses in many sectors of economy, one lucrative sector is international trade. Pakistan’s export potential has undergone strenuous pressures to perform according to the past performance. There was a need to reveal new export potential and lucrative sectors of economy with recommended policy changes so that new paradigm change in international trade can be initiated. This empirical study carried to meet the objective in which gravity model is used for investi

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