Searched for: subject%3A%22Gravity%22
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van den Bogaard, Fenna (author)
The origin of the Martian dichotomy is subject to question and no substantial evidence exists. Some surface and interior features that are not visible in, e.g., topography data, can show up in gravity data. Therefore, this research inverts gravity data to find a crustal and mantle global density model. Previous research performed a one-layer...
master thesis 2024
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Han, Shin-Chan (author), Sauber, Jeanne (author), Broerse, D.B.T. (author), Pollitz, Fred (author), Okal, Emile (author), Jeon, Taehwan (author), Seo, Ki Weon (author), Stanaway, Richard (author)
Earthquakes involve mass redistribution within the solid Earth and the ocean, and as a result, perturb the Earth's gravitational field. For most of the shallow (&lt;60 km) earthquakes with M<sub>w</sub> &gt; 8.0, the GRACE satellite gravity measurements suggest considerable volumetric disturbance of rocks. At a spatial scale of hundreds of km...
journal article 2024
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Daras, I. (author), March, G. (author), Pail, R. (author), Hughes, C. W. (author), Braitenberg, C. (author), Guntner, A. (author), Eicker, A. (author), Wouters, B. (author), Heller-Kaikov, B. (author)
The joint ESA/NASA Mass-change And Geosciences International Constellation (MAGIC) has the objective to extend time-series from previous gravity missions, including an improvement of accuracy and spatio-temporal resolution. The long-term monitoring of Earth’s gravity field carries information on mass change induced by water cycle, climate...
journal article 2024
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Polanía, Oscar (author), Estrada, Nicolas (author), Azéma, Emilien (author), Renouf, Mathieu (author), Cabrera, M.A. (author)
The column collapse experiment is a simplified version of natural and industrial granular flows. In this set-up, a column built with grains collapses and spreads over a horizontal plane. Granular flows are often studied with a monodisperse distribution; however, this is not the case in natural granular flows where a variety of grain sizes, known...
journal article 2024
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Pols, C.F.J. (author)
This article presents an experimental setup capable of conducting various experiments. The setup is used to accurately determine the acceleration due to gravity using either the pendulum or free fall experiment, as well as to allow students to conceive and conduct their own experiment. We discuss the design of the setup and the experiments...
journal article 2024
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Cowan, Sean (author)
While the space industry expands rapidly and space exploration becomes ever more relevant, this thesis aims to automate the design of Multiple Gravity-Assist (MGA) transfers using low-thrust propulsion. In particular, during the preliminary design phase of space missions, the combinatorial complexity of MGA sequencing is large and current...
master thesis 2023
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Viero, Edoardo (author)
The current project investigated the feasibility of aerocapture at Jupiter, and the benefits in terms of payload mass fraction that could be achieved compared to traditional orbital insertion burns. A numerical simulation model has been set up, as well as an analytical formulation of the problem. The numerical verification of the analytical...
master thesis 2023
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Wei, Tom (author)
DMD (Duchenne muscular dystrophy) is a genetic disorder characterized by progressive muscle weakness, leading to the eventual loss of muscle function. After losing lower extremity function, DMD patients lose the ability to use their arms. To assist individuals with DMD, an upper extremity exoskeleton is being developed to provide support. <br/>...
master thesis 2023
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Groeneveld, Yuri (author)
Comparing the performance of distribution functions and a discrete choice model, on a mode &amp; destination choice in a tour-based model. An discrete choice model is composed for a tour-based model. Both choice models are implemented in a large-scale tour-based model and the performances are compared.
master thesis 2023
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Schrama, Ernst (author), Visser, P.N.A.M. (author)
In this paper we review the precision orbit determination (POD) performance of the CryoSat-2 mission where we used all tracking data between June-2010 and Jan-2023; with station and beacon coordinates provided in the ITRF2020 reference system, we use a mean gravity model, and we use spacecraft specific models for modeling drag and radiation...
journal article 2023
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Yang, Y. (author), Jia, Bin (author), Yan, Xiao Yong (author), Chen, Yan (author), Song, Dongdong (author), Zhi, Danyue (author), Wang, Y. (author), Gao, Ziyou (author)
Accurate estimation of intercity heavy truck mobility flows is of vital importance to urban planning, transportation management and logistics operations. The inaccessibility of big data related to intercity transport systems and the heterogeneity of trucking activities pose challenges for the reliable estimation. Recently, the advance of...
journal article 2023
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Ali, Muhammad (author), Singh, Yogesh (author), Fortunato, Luca (author), Rehman, Zahid Ur (author), Manjunath, Sarvajith (author), Vrouwenvelder, J.S. (author), Pronk, M. (author), van Loosdrecht, Mark C.M. (author), Saikaly, Pascal E. (author)
This study describes a novel integration of aerobic granular sludge (AGS) with a gravity-driven membrane (GDM) system at a pilot scale with a treatment capacity of approximately 150 L per day to treat raw domestic wastewater. The treatment performance and energy consumption of the AGS-GDM system were compared to the neighboring full-scale...
journal article 2023
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Tang, Tianning (author), Moss, Charlotte (author), Draycott, Samuel (author), Bingham, Harry B. (author), van den Bremer, T.S. (author), Li, Yan (author), Adcock, Thomas A.A. (author)
An increased number of rogue waves, relative to standard distributions, can be induced by unidirectional waves passing over abrupt decreases in water depth. We investigate this phenomenon in a more general setting of multidirectional waves. We examine the influence of the directionality on the occurrence probability of rogue waves using...
journal article 2023
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Chang, Guobin (author), Qian, N. (author), Bian, Shaofeng (author)
Point-mass inversion is widely employed in GRACE level-2 data processing. Conventionally, the spherical harmonic (SH) coefficients are used indirectly: a set of pseudo measurements is generated first using the SH coefficients through SH synthesis; then the point-mass inversion is done with these pseudo measurements. To be statistically optimal,...
journal article 2023
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You, Kairui (author), Yu, Yanhui (author), Cai, Weiguang (author), Liu, Zhengxuan (author)
The CO<sub>2</sub> emission mitigation of the commercial and public building sector (P&amp;C) is critical for achieving China's carbon peak and carbon neutrality. Analyzing changes in CO<sub>2</sub> emissions and their driving factors from temporal and spatial perspective provides insights for developing equitable and effective...
journal article 2023
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Park, Jaeheung (author), van den IJssel, J.A.A. (author), Siemes, C. (author)
We statistically investigate fluctuation amplitudes (normalized to the background values) of dayside low-/mid-latitude upper-thermospheric mass density as observed by the Gravity Recovery and Climate Experiment (GRACE) and GRACE-Follow-On (GRACE-FO) spacecraft at ∼500 km altitude between 2002 and 2022. There are three new findings in our...
journal article 2023
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Mohamed, Ahmed (author), Abdelrady, Ahmed (author), Alarifi, Saad S. (author), Othman, Abdullah (author)
Because of climate change and human activity, North and Central Africa are experiencing a significant water shortage. Recent advancements in earth observation technologies have made widespread groundwater monitoring possible. To examine spatial and temporal mass fluctuations caused by groundwater variations in Chad, gravity solutions from the...
journal article 2023
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Trumic, Maja (author), Della Santina, C. (author), Jovanovic, Kosta (author), Fagiolini, Adriano (author)
This letter investigates the stability properties of the soft inverted pendulum with affine curvature - a template model for nonlinear control of underactuated soft robots. We look at how changes in physical parameters affect stability and equilibrium. We give conditions under which zero dynamics corresponding to a collocated choice of the...
journal article 2023
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Karimi, Hamed (author), Iran-Pour, Siavash (author), Amiri Simkooei, A. (author), Babadi, Masoud (author)
Gravity recovery and climate experiment (GRACE) and GRACE Follow-On (GRACE-FO) are Earth's gravity satellite missions with hydrological monitoring applications. However, caused by measuring instrumental problems, there are several temporal missing values in the dataset of the two missions where a long gap between the mission dataset also...
journal article 2023
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Mohamed, Ahmed (author), Othman, Abdullah (author), Galal, Wael F. (author), Abdelrady, Ahmed (author)
In order to cope with the rise in human-caused demands, Saudi Arabia is exploring new groundwater sources. The groundwater potential of Wadi Ranyah was studied using a multi-dataset-integrated approach that included time-variable gravity data from the Gravity Recovery and Climate Experiment (GRACE), vertical electrical sounding (VES), and...
journal article 2023
Searched for: subject%3A%22Gravity%22
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