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Journal articles on the topic 'Gravity change'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Dray, Tevian, George Ellis, Charles Hellaby, and Corinne A. Manogue. "Gravity and Signature Change." General Relativity and Gravitation 29, no. 5 (1997): 591–97. http://dx.doi.org/10.1023/a:1018895302693.

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2

Wang, Xinghong. "Does gravitational time dilation influence the propagation of the change of gravitational field?" Theoretical and Natural Science 12, no. 1 (2023): 185–92. http://dx.doi.org/10.54254/2753-8818/12/20230465.

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This article uses thought experiments and strict logical deductions to discuss the propagation the change of gravity field and find that all current gravity fields are generated some time before and they are not static but are constantly propagating. If there is a change of the gravity field of a celestial body, it takes time for this change to propagate before interacting with this another celestial body. However, for a binary black hole system, the positions of the two black holes constantly changes relative to each other, resulting in changes of the gravity fields of both black holes, and,

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3

Wang, Yaxiang, Ziyi Cao, Zhaojun Pang, et al. "Influence of Three Gorges Dam on earthquakes based on GRACE gravity field." Open Geosciences 14, no. 1 (2022): 453–61. http://dx.doi.org/10.1515/geo-2022-0350.

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Abstract After the completion of the Three Gorges Dam, it increases the risk of inducing an earthquake. We use the GRACE Gravity Field Model to analyze the relationship between the operation of the Three Gorges Reservoir and the change of gravity field in western Sichuan. The research results indicate that the reservoir water level and the western Sichuan gravitational field are positively correlated. In the early stage of rising water level, the change of gravity field is not apparent, and the change of gravity field gradually increases with time. Therefore, the change of reservoir water leve

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4

De Paepe, Karl. "Gravity and energy change paradox." Physics Essays 29, no. 3 (2016): 343. http://dx.doi.org/10.4006/0836-1398-29.3.343.

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5

Chan, Wilson. "Changes in Gravity Value and Anti-Gravity Application." British Journal of Physics Studies 1, no. 1 (2022): 20–26. http://dx.doi.org/10.32996/bjps.2022.1.1.4.

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Gravity is a phenomenon that has been part of the universe since its creation. This phenomenon is when an object pulls everything around it toward the center of the object. Gravity itself was discovered by Sir Isaac Newton in the 17th century. Humans think that there is no such thing as anti-gravity. This research aims to prove that the value of a planet's gravity can change under certain conditions. In addition, this research also aims to prove that humans can create something that causes all objects in a particular area to have a value close to anti-gravity. In short, 3 influences can change

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6

Moore, Philip, and Matt A. King. "Satellite gravity gradiometry: Secular gravity field change over polar regions." Journal of Geodynamics 49, no. 5 (2010): 247–53. http://dx.doi.org/10.1016/j.jog.2010.01.007.

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7

Breili, Kristian, and Cecilie Rolstad. "Ground-based gravimetry for measuring small spatial-scale mass changes on glaciers." Annals of Glaciology 50, no. 50 (2009): 141–47. http://dx.doi.org/10.3189/172756409787769717.

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AbstractGravity change on a glacier surface is a composite of several effects (e.g. melting and accumulation of snow and ice, redistribution of mass with depth by refreezing of meltwater and height and thickness changes of the snow and ice layers). Models and equations necessary to estimate the measured gravity change due to different effects are presented, and the propagation of observational errors is evaluated. The paper presents experiences with ground-based gravity measurements carried out on Hardangerjøkulen, Norway, in spring and autumn 2007. It was found that the vertical gradient of g

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8

Allis, Richard G., and Trevor M. Hunt. "Analysis of exploitation‐induced gravity changes at Wairakei Geothermal Field." GEOPHYSICS 51, no. 8 (1986): 1647–60. http://dx.doi.org/10.1190/1.1442214.

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Gravity changes (corrected for subsidence) of up to -1 000 (±300) μGal have occurred in the [Formula: see text] area of the production bore field at Wairakei, and smaller decreases extend over a [Formula: see text] surrounding area. The largest part of these decreases occurred during the 1960s; since then the net gravity change for the whole field has been zero, indicating mass flow equilibrium. The principal causes of gravity change have been deep liquid pressure drawdown which resulted in formation of a steam zone, subsequent saturation changes in the steam zone, liquid temperature decline,

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9

Tokuda, Makoto, Khandaker Jahirul Isram, Yudai Ogata, et al. "Strong-Gravity Experiments on Perovskite-Type Oxides." Advances in Science and Technology 88 (October 2014): 70–73. http://dx.doi.org/10.4028/www.scientific.net/ast.88.70.

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Strong gravitational field causes the displacement or/and sedimentation of atoms in solids, by which we can changes the crystalline state or/and composition in multicomponent condensed matter. Perovskite-type doped manganite, La1-xSrxMnO3(LSMO) has unique magnetoresistance effect which is called “colossal magnetoresistance (CMR)”. In this study, the strong gravity experiment (0.40x106G, 400°C, 20h) was performed on the LSMO oriented crystal to examine the change in composition or structure. The LSMO crystal whose growing crystal direction is normal to (214) plane was prepared by the floating z

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10

Qu, Wei, Yaxi Han, Zhong Lu, Dongdong An, Qin Zhang, and Yuan Gao. "Co-Seismic and Post-Seismic Temporal and Spatial Gravity Changes of the 2010 Mw 8.8 Maule Chile Earthquake Observed by GRACE and GRACE Follow-on." Remote Sensing 12, no. 17 (2020): 2768. http://dx.doi.org/10.3390/rs12172768.

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The Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-on (GRACE-FO) satellites are important for studying regional gravitational field changes caused by strong earthquakes. In this study, we chose Chile, one of Earth’s most active seismic zones to explore the co-seismic and post-seismic gravitational field changes of the 2010 Mw 8.8 Maule earthquake based on longer-term GRACE and the newest GRACE-FO data. We calculated the first-order co-seismic gravity gradient changes (GGCs) and probed the geodynamic characteristics of the earthquake. The earthquake caused significant positive

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11

USUI, NAGAO. "Developmental Change of Gravity Center Sway." Rigakuryoho kagaku 10, no. 3 (1995): 167–73. http://dx.doi.org/10.1589/rika.10.167.

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12

Sobol, Margarita A., Fernando González-Camacho, Elizabeth L. Kordyum, and Francisco Javier Medina. "Nucleolar proteins change in altered gravity." Journal of Applied Biomedicine 5, no. 1 (2007): 49–56. http://dx.doi.org/10.32725/jab.2007.007.

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13

Chown, Marcus. "Does gravity change with the seasons?" New Scientist 202, no. 2704 (2009): 28–31. http://dx.doi.org/10.1016/s0262-4079(09)61059-9.

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14

Snell, Clarke. "Climate Change is the New Gravity." Architectural Design 88, no. 1 (2018): 6–15. http://dx.doi.org/10.1002/ad.2253.

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15

Mancinelli, Paolo, Giorgio Ranalli, and Cristina Pauselli. "Non-Linear Effects of Gravity Change on Mantle Dynamics." Geosciences 14, no. 11 (2024): 301. http://dx.doi.org/10.3390/geosciences14110301.

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Starting from observed variations of the length of day in the past 2.5 billion years, we calculate the corresponding gravity variation and evaluate the possible effects that such variation would have induced on the lithosphere and on mantle convection. The lithospheric stress induced by the observed gravity increase at the equator in 500 Ma is of the same order as the one associated with a convective cell. We model a gravity increase that would result in 1.3 × 10−2 µGal or 1.3 × 10−10 m s−2 over 10 years, a value that is not far from the detection thresholds of modern gravimeters. Gravity incr

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16

Pennybaker, Kent A. "Borehole gravity drift correction: A new approach." GEOPHYSICS 53, no. 10 (1988): 1343–46. http://dx.doi.org/10.1190/1.1442412.

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Gravity meter drift is the gradual change in the gravity reading over time; this change is unrelated to actual gravity changes. Drift is caused by creep in the gravity meter mechanism and by external influences which produce a change in the physical properties of the gravity element. Previous methods of drift correction for the LaCoste and Romberg borehole gravity meter are either linear random noise filters or nonlinear techniques relying upon the judgement of an interpreter for filtering. The method presented in this paper responds to the nonlinearity of the drift signal while retaining the

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17

Xu, Xinyu, Hao Ding, Yongqi Zhao, Jin Li, and Minzhang Hu. "GOCE-Derived Coseismic Gravity Gradient Changes Caused by the 2011 Tohoku-Oki Earthquake." Remote Sensing 11, no. 11 (2019): 1295. http://dx.doi.org/10.3390/rs11111295.

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In contrast to most of the coseismic gravity change studies, which are generally based on data from the Gravity field Recovery and Climate Experiment (GRACE) satellite mission, we use observations from the Gravity field and steady-state Ocean Circulation Explorer (GOCE) Satellite Gravity Gradient (SGG) mission to estimate the coseismic gravity and gravity gradient changes caused by the 2011 Tohoku-Oki Mw 9.0 earthquake. We first construct two global gravity field models up to degree and order 220, before and after the earthquake, based on the least-squares method, with a bandpass Auto Regressi

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18

Tempone, Pamela, Martin Landrø, and Erling Fjær. "4D gravity response of compacting reservoirs: Analytical approach." GEOPHYSICS 77, no. 3 (2012): G45—G54. http://dx.doi.org/10.1190/geo2010-0361.1.

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Time-lapse gravity is a technique sensitive to subsurface change in mass and in mass distribution. We attempted to devise a method to predict gravity effects caused by redistribution of subsurface mass induced by reservoir compaction. First, displacements and strains due to compaction were modeled using a geomechanical model. Then, 4D gravity effects were derived from the displacements and the volumetric strains computed in and around the reservoir. A sensitivity study was carried out for geomechanical parameters, such as Poisson’s ratio, as well as for geometrical parameters, such as reservoi

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19

Yang, Jinling, Shi Chen, Bei Zhang, Jiancang Zhuang, Linhai Wang, and Hongyan Lu. "Gravity Observations and Apparent Density Changes before the 2017 Jiuzhaigou Ms7.0 Earthquake and Their Precursory Significance." Entropy 23, no. 12 (2021): 1687. http://dx.doi.org/10.3390/e23121687.

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An Ms7.0 earthquake struck Jiuzhaigou (China) on 8 August 2017. The epicenter was in the eastern margin of the Tibetan Plateau, an area covered by a dense time-varying gravity observation network. Data from seven repeated high-precision hybrid gravity surveys (2014–2017) allowed the microGal-level time-varying gravity signal to be obtained at a resolution better than 75 km using the modified Bayesian gravity adjustment method. The “equivalent source” model inversion method in spherical coordinates was adopted to obtain the near-crust apparent density variations before the earthquake. A major g

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20

Olsson, Per-Anders, Kristian Breili, Vegard Ophaug, et al. "Postglacial gravity change in Fennoscandia—three decades of repeated absolute gravity observations." Geophysical Journal International 217, no. 2 (2019): 1141–56. http://dx.doi.org/10.1093/gji/ggz054.

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21

Ekman, Martin. "Gravity change, geoid change and remaining postglacial uplift of Fennoscandia." Terra Nova 3, no. 4 (1991): 390–92. http://dx.doi.org/10.1111/j.1365-3121.1991.tb00167.x.

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22

Yu, Fei, Guiju Wu, Yufei Xi, et al. "Inversion of Gravity Anomalies Based on U-Net Network." Symmetry 17, no. 4 (2025): 523. https://doi.org/10.3390/sym17040523.

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The deep learning-based gravity anomaly inversion method addresses the complex challenge of deriving subsurface density variation models from surface gravity anomaly data. In order to generate various geological environments and their corresponding surface gravity anomaly datasets, three-dimensional density models considering different spatial locations and density variations are created in this paper. At the same time, the residual module and spatial attention mechanism are introduced into the U-Net architecture to improve the learning ability and inversion accuracy of complex geological stru

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23

Zhu, Fengshun, Xin Liu, Zhen Li, Jiajia Yuan, Jinyun Guo, and Heping Sun. "High spatial resolution marine gravity trend determined from multisatellite altimeter data over Bay of Bengal." Geophysical Journal International 235, no. 3 (2023): 2257–67. http://dx.doi.org/10.1093/gji/ggad368.

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SUMMARY Mass redistribution in the Earth system induce variations of the Earth's gravity field. Now, the time-varying gravity models from the Gravity Recovery and Climate Experiment (GRACE) mission can only estimate the large-scale gravity changes, so the high-resolution marine gravity trend (MGT) model is urgently required to detect small-scale Earth's mass migration. The sea level change is a significant response to marine gravity field change. Here, we propose to estimate the high-resolution MGT using the sea level trend (SLT). Firstly, the SLT model caused by marine mass change (MMC) on 5′

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24

Wang, Yang, Tingting Xia, Remina Shataer, Shuai Zhang, and Zhi Li. "Analysis of Characteristics and Driving Factors of Land-Use Changes in the Tarim River Basin from 1990 to 2018." Sustainability 13, no. 18 (2021): 10263. http://dx.doi.org/10.3390/su131810263.

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Land-use and cover change is an important indicator for exploring global change trends, with in-depth research on land use and its driving factors being of particular significance in forging ecologically sustainable development. The present work used the Tarim River Basin as the study area, while the land-use transfer matrix, normalized difference vegetation index (NDVI), regional center-of-gravity model, and night-time-light remote-sensing mutual correction method were employed to explore temporal and spatial characteristics of land-use change and its driving factors. The results show the fol

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25

Yakushin, Sergei B., Yongqing Xiang, Bernard Cohen, and Theodore Raphan. "Dependence of the Roll Angular Vestibuloocular Reflex (aVOR) on Gravity." Journal of Neurophysiology 102, no. 5 (2009): 2616–26. http://dx.doi.org/10.1152/jn.00245.2009.

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Little is known about the dependence of the roll angular vestibuloocular reflex (aVOR) on gravity or its gravity-dependent adaptive properties. To study gravity-dependent characteristics of the roll aVOR, monkeys were oscillated about a naso-occipital axis in darkness while upright or tilted. Roll aVOR gains were largest in the upright position and decreased by 7–15% as animals were tilted from the upright. Thus the unadapted roll aVOR gain has substantial gravitational dependence. Roll gains were also decreased or increased by 0.25 Hz, in- or out-of-phase rotation of the head and the visual s

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26

Petroškevičius, Petras, Rosita Birvydiene, and Darius Popovas. "The Effect of the Disturbing Potential for the Gravity Field." Solid State Phenomena 220-221 (January 2015): 257–63. http://dx.doi.org/10.4028/www.scientific.net/ssp.220-221.257.

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The Earth’s gravity field tends to change due to various reasons. These are diverse processes occurring inside the Earth or changes initiated by human activity. The increasing accuracy of measurements has enabled to take into consideration fluctuations in the gravity field. The article presents research study on the effect of gravity potential describing variations in the gravity field affecting gravity field elements related to the performed measurements. Due to the effect of the disturbing potential, a change in gravity and the deviation of vertical and equipotential surface deformation have

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27

Xian, Pengfei, Bing Ji, Shaofeng Bian, and Bei Liu. "Influence of Sea Level Anomaly on Underwater Gravity Gradient Measurements." Sensors 22, no. 15 (2022): 5758. http://dx.doi.org/10.3390/s22155758.

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Considering the theoretical research needs of gravity gradient detection and navigation, this study uses the right rectangular prism method to calculate the disturbing gravity gradient from sea level anomalies in the range of 5° × 5° in the Kuroshio extension area of the western Pacific with large sea level anomalies. The disturbing gravity gradient is obtained in different directions within a depth of 50 m below the mean sea level based on the principle of the disturbing gravity gradient. The calculation results show that the sea level anomalies at local positions significantly impact the und

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Okubo, Shuhei, and Hidefumi Watanabe. "Gravity change caused by a fissure eruption." Geophysical Research Letters 16, no. 5 (1989): 445–48. http://dx.doi.org/10.1029/gl016i005p00445.

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29

MacDougall, J. W., and G. E. Hall. "AnFregion height change produced by gravity waves." Radio Science 33, no. 6 (1998): 1867–76. http://dx.doi.org/10.1029/98rs01787.

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30

Höpfl, Heather. "The Paradoxical Gravity of Planned Organizational Change." Journal of Organizational Change Management 7, no. 5 (1994): 20–31. http://dx.doi.org/10.1108/09534819410068886.

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31

Horowitz, G. T. "Topology change in classical and quantum gravity." Classical and Quantum Gravity 8, no. 4 (1991): 587–601. http://dx.doi.org/10.1088/0264-9381/8/4/007.

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32

Kumar, Mohi. "Melting glaciers can change Earth's gravity field." Eos, Transactions American Geophysical Union 92, no. 38 (2011): 324. http://dx.doi.org/10.1029/2011eo380010.

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33

Carlip, S., and R. Cosgrove. "Topology change in (2+1)‐dimensional gravity." Journal of Mathematical Physics 35, no. 10 (1994): 5477–93. http://dx.doi.org/10.1063/1.530760.

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34

Bentley, C. R., and J. M. Wahr. "Satellite gravity and the mass balance of the antarctic ice sheet." Journal of Glaciology 44, no. 147 (1998): 207–13. http://dx.doi.org/10.3189/s0022143000002549.

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AbstractChanges in the Earth’s gravity field with time have important applications to a broad range of disciplines. Any process that involves a large enough horizontal redistribution of mass, either within the Earth or on or above its surface, is potentially detectable. In particular, when ice sheets grow or shrink, gravity changes as mass is redistributed in the solid earth and between the oceans and the ice sheets. The sources of global sea-level rise (about 2 mm a−1 over the last century) and in particular the contribution of the Antarctic ice sheet thereto are not well understood. Gravity

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35

Bentley, C. R., and J. M. Wahr. "Satellite gravity and the mass balance of the antarctic ice sheet." Journal of Glaciology 44, no. 147 (1998): 207–13. http://dx.doi.org/10.1017/s0022143000002549.

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AbstractChanges in the Earth’s gravity field with time have important applications to a broad range of disciplines. Any process that involves a large enough horizontal redistribution of mass, either within the Earth or on or above its surface, is potentially detectable. In particular, when ice sheets grow or shrink, gravity changes as mass is redistributed in the solid earth and between the oceans and the ice sheets. The sources of global sea-level rise (about 2 mm a−1over the last century) and in particular the contribution of the Antarctic ice sheet thereto are not well understood. Gravity m

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36

McCubbine, J. C., V. Stagpoole, F. Caratori Tontini, et al. "Evaluating temporal stability of the New Zealand quasigeoid following the 2016 Kaikōura earthquake using satellite radar remote sensing." Geophysical Journal International 220, no. 3 (2019): 1917–27. http://dx.doi.org/10.1093/gji/ggz536.

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SUMMARY Quasigeoid models can be determined from surface gravity anomalies, so are sensitive to changes in the shape of the topography as well as changes in gravity. Here we present results of forward modelling gravity/quasigeoid changes from synthetic aperture radar data following the 2016 Mw 7.8 Kaikōura earthquake with land uplift of up to 10 m. We assess the impact of the topographic deformation on the reference surface of the New Zealand vertical datum in lieu of costly field gravity field measurements. The most significant modelled gravity and quasigeoid changes are—2.9 mGal and 5–7 mm,

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37

Li, Yan Bin, Ren Song Zou, and Tong Jiang. "Influence on Inertia the Moment of Inertia Matrix of Three Degrees of Freedom Air-Bearing Testbed." Advanced Materials Research 706-708 (June 2013): 1393–96. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.1393.

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To improve the accuracy of attitude determination and control stabilization when simulating attitude motion of satellites in the space, the finite element model of the platform of 3-DOF spacecraft attitude control simulator was founded. Gravity field of air bearing testbed and formula for platform’s moment of inertia on the action of gravity was induced The result shows platform’s attitude accuracy error exist because of main principal axis of inertia change of direction.on the action of gravity, The more large value it is, the more error is .Error of inertia main axis changes as sine curve wi

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38

Pool, D. R. "The utility of gravity and water-level monitoring at alluvial aquifer wells in southern Arizona." GEOPHYSICS 73, no. 6 (2008): WA49—WA59. http://dx.doi.org/10.1190/1.2980395.

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Coincident monitoring of gravity and water levels at 39 wells in southern Arizona indicate that water-level change might not be a reliable indicator of aquifer-storage change for alluvial aquifer systems. One reason is that water levels in wells that are screened across single or multiple aquifers might not represent the hydraulic head and storage change in a local unconfined aquifer. Gravity estimates of aquifer-storage change can be approximated as a one-dimensional feature except near some withdrawal wells and recharge sources. The aquifer storage coefficient is estimated by the linear regr

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BOROWIEC, ANDRZEJ, MAURO FRANCAVIGLIA, and IGOR VOLOVICH. "TOPOLOGY CHANGE AND SIGNATURE CHANGE IN NON-LINEAR FIRST-ORDER GRAVITY." International Journal of Geometric Methods in Modern Physics 04, no. 04 (2007): 647–67. http://dx.doi.org/10.1142/s021988780700220x.

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We show that different topologies of a space-time manifold and different signatures of its metric can be encompassed into a single Lagrangian formalism, provided one adopts the first-order (Palatini) formulation and relies on nonlinear Lagrangians, that were earlier shown to produce, in the generic case, universality of Einstein field equations and of Komar's energy-momentum complex as well. An example in Relativistic Cosmology is provided.

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Creutzfeldt, Benjamin, Andreas Güntner, Thomas Klügel, and Hartmut Wziontek. "Simulating the influence of water storage changes on the superconducting gravimeter of the Geodetic Observatory Wettzell, Germany." GEOPHYSICS 73, no. 6 (2008): WA95—WA104. http://dx.doi.org/10.1190/1.2992508.

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Superconducting gravimeters (SG) measure temporal changes of the Earth’s gravity field with high accuracy and long-term stability. Variations in local water storage components (snow, soil moisture, groundwater, surface water, and water stored by vegetation) can have a significant influence on SG measurements and — from a geodetic perspective — add noise to the SG records. At the same time, this hydrological gravity signal can provide substantial information about the quantification of water balances. A 4D forward model with a spatially nested discretization domain was developed to investigate

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41

Zhu, Fengshun, Jinyun Guo, Huiying Zhang, Lingyong Huang, Heping Sun, and Xin Liu. "SDUST2020MGCR: a global marine gravity change rate model determined from multi-satellite altimeter data." Earth System Science Data 16, no. 5 (2024): 2281–96. http://dx.doi.org/10.5194/essd-16-2281-2024.

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Abstract. Investigating the global time-varying gravity field mainly depends on GRACE/GRACE-FO gravity data. However, satellite gravity data exhibit low spatial resolution and signal distortion. Satellite altimetry is an important technique for observing the global ocean and provides many consecutive years of data, which enables the study of high-resolution marine gravity variations. This study aims to construct a high-resolution marine gravity change rate (MGCR) model using multi-satellite altimetry data. Initially, multi-satellite altimetry data and ocean temperature–salinity data from 1993

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42

Zhang, Jun. "Three Dimensional Numerical Simulation and Signal Processing Method of Moving Objects in the Change of Gravity." Applied Mechanics and Materials 539 (July 2014): 493–96. http://dx.doi.org/10.4028/www.scientific.net/amm.539.493.

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Based on the three-dimensional rotating coordinate mathematical model, this paper has established the mathematical equations for the principal moments of inertia, the centroid position and the center of gravity position. In order to validate the validity and reliability of this mathematical equation model, the paper designs the three-dimensional virtual simulation system of changes in the center of gravity during the process of computer tennis player. And it analyzes the performance of this system through the prediction of the center of gravity position of athletes. Through the computer GMM te

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43

He, J. P., R. Kram, and T. A. McMahon. "Mechanics of running under simulated low gravity." Journal of Applied Physiology 71, no. 3 (1991): 863–70. http://dx.doi.org/10.1152/jappl.1991.71.3.863.

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Using a linear mass-spring model of the body and leg (T. A. McMahon and G. C. Cheng. J. Biomech. 23: 65–78, 1990), we present experimental observations of human running under simulated low gravity and an analysis of these experiments. The purpose of the study was to investigate how the spring properties of the leg are adjusted to different levels of gravity. We hypothesized that leg spring stiffness would not change under simulated low-gravity conditions. To simulate low gravity, a nearly constant vertical force was applied to human subjects via a bicycle seat. The force was obtained by stretc

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44

Gasperikova, E., and G. M. Hoversten. "Gravity monitoring of C O2 movement during sequestration: Model studies." GEOPHYSICS 73, no. 6 (2008): WA105—WA112. http://dx.doi.org/10.1190/1.2985823.

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Sequestration/enhanced oil recovery (EOR) petroleum reservoirs have relatively thin injection intervals with multiple fluid components (oil, hydrocarbon gas, brine, and carbon dioxide, or [Formula: see text]), whereas brine formations usually have much thicker injection intervals and only two components (brine and [Formula: see text]). Coal formations undergoing methane extraction tend to be thin [Formula: see text] but shallow compared to either EOR or brine formations. Injecting [Formula: see text] into an oil reservoir decreases the bulk density in the reservoir. The spatial pattern of the

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45

Zhang, Shu-Yin, and Yuan Zhong. "Effect of growth rate on specific gravity of East-Liaoning oak (Quercusliaotungensis) wood." Canadian Journal of Forest Research 21, no. 2 (1991): 255–60. http://dx.doi.org/10.1139/x91-031.

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The effect of growth rate on the specific gravity of East-Liaoning oak (Quercusliaotungensis Koidz.) wood was studied and statistically compared with the effect of age (ring number from the pith). Results revealed that age is a decisive factor in controlling the specific gravity of wood, while effect of growth rate on specific gravity is statistically less important. Furthermore, the effect of growth rate varies with ring width range, age, and position within one growth ring (earlywood, latewood, or the whole ring). Within narrower ring widths, specific gravity increases rapidly with increasin

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Zhou, Gui Fen, Guang Ming Chen, Rui Zhang, Shu Cai Xu, and Jian Qiao Li. "Numerical Study of Low Gravity Effect on the Pressure-Sinkage Characteristics of Soft Soil." Applied Mechanics and Materials 101-102 (September 2011): 488–91. http://dx.doi.org/10.4028/www.scientific.net/amm.101-102.488.

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The adhesion and the compressibility of the soft soil will vary as the earth gravity changes. In this study, the pressure-sinkage characteristics in low gravity conditions were investigated by three-dimensional Discrete Element Method (DEM). The data of the DEM parameters were obtained by analyzing the pressure-sinkage relationship embedded in laboratory testing data. The pressure-sinkage experiments of the sample soil in different gravities were simulated by using the software PFC3D. Using the Bekker formula, the values of pressure-sinkage parameters were obtained. The results show that, when

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Xie, Wen Wen, and Yong Zheng Fu. "Calculation and Analysis of Gravity Head Coefficient in Hot Water Heating System." Applied Mechanics and Materials 580-583 (July 2014): 2432–37. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.2432.

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This paper presented a method of mathematical expectation to calculate gravity head coefficient, and this method was applied to calculate the value of gravity head coefficient of some selected cities in China in different operation regulation mode and different design supply and return water temperature. The results show that gravity head coefficient calculated by this method reflects the average value during the whole heating period. It has more representative significance. When the temperature of design supply and return water in heating system is reduced, the gravity head coefficients chang

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Yushkin, V. D., L. V. Zotov, A. V. Basmanov, and R. A. Sermyagin. "Gravity acceleration changes in Russian stations of comparing absolute gravimeters." Geodesy and Cartography 977, no. 11 (2021): 8–15. http://dx.doi.org/10.22389/0016-7126-2021-977-11-8-15.

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The article deals with the study of changes in the values of gravitational accelerations at the Russian comparison’s sites of the absolute gravimeters “Pulkovo”, “Svetloye” and “Zvenigorod” for the years of 2007–2013. A significant increase of the values instead of the expected decrease was obtained. The authors make an attempt to reveal the reasons for that basing on the calculation of the change in the gravitational field using the Bouguer and Faye corrections. The estimates do not fully explain the phenomenon, according neither to gravimeters nor to satellite data. At the sites of “Pulkovo”

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Cong, Jing. "Establishing a Mathematical Model for the Change of the Center of Gravity of Water Tanks." Scientific and Social Research 4, no. 3 (2022): 65–70. http://dx.doi.org/10.26689/ssr.v4i3.3662.

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The subject of center of gravity is inseparable from our daily lives; hence, the research on center of gravity has very important practical significance. This paper mainly studies the change of the center of gravity of a cuboid containing two water tanks upon flipping. Using the idea of differential equations, Visio and RealFlow are used to simulate the entire process, and the influence on the distance between the centroid and the center of gravity of the cuboid (including the water tanks) caused by the proportion of water in the water tank is studied and the inclination angle of the water tan

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Xu, Min, Shichang Kang, and Jiazhen Li. "Evaluation of Water Storage Change of Inland Cryosphere in Northwestern China." Advances in Meteorology 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/681634.

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The Gravity Recovery and Climate Experiment (GRACE) satellite mission provides measurements of Earth’s static and time-variable gravity fields with monthly resolution. In this study, changes of water storage in northwestern China were determined by GRACE monthly gravity field data obtained from 2003 to 2010. Comparisons of water storage change (WSC) simulated by a four-dimensional assimilation model (Noah) and observed by GRACE revealed similar patterns of change and a correlation coefficient of 0.71(P<0.05). Trend analysis indicated significant changes in the spatiotemporal variation of WS

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