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Teses / dissertações sobre o tema "Gravity Model"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Sellner, Richard, Manfred M. Fischer, and Matthias Koch. "A Spatial Autoregressive Poisson Gravity Model." Wiley-Blackwell, 2013. http://dx.doi.org/10.1111/gean.12007.

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In this article, a Poisson gravity model is introduced that incorporates spatial dependence of the explained variable without relying on restrictive distributional assumptions of the underlying data-generating process. The model comprises a spatially filtered component including the origin-, destination-, and origin-destination-specific variables and a spatial residual variable that captures origin- and destination-based spatial autocorrelation. We derive a two-stage nonlinear least-squares (NLS) estimator (2NLS) that is heteroscedasticity- robust and, thus, controls for the problem of o

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2

Wu, Wei Trindade Vitor. "Three essays on trade gravity model." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6156.

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Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 17, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dissertation advisor: Dr. Vitor Trindade. Vita. Includes bibliographical references.

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3

Kalasin, Thaveechai. "Dynamic macroelement model for gravity retaining walls." Thesis, University of Bristol, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404085.

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4

Karl, Joanna Robin. "Gravity Sedimentation: A One-Dimensional Numerical Model." PDXScholar, 1993. https://pdxscholar.library.pdx.edu/open_access_etds/4594.

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A large fraction of the current cost of wastewater treatment is from the treatment and disposal of wastewater sludge. Improved design, energy efficiency, and performance of dewatering facilities could significantly decrease transport and disposal costs. Dewatering facilities are designed based on field experience, trial and error, pilot plant testing, and/or full scale testing. Design is generally time-consuming and expensive. A full-scale test typically consists_ of side-by-side operation of 4 to 5 full-scale dewatering units for several weeks to more than 6 months. Theoretical modeling of th

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5

Ahmed, Dhafar Ibrahim. "Experimental and numerical study of model gravity currents in coastal environment : bottom gravity currents." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0060/document.

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Le but de ce travail de recherche est de contribuer à une meilleure compréhension de la dynamique de propagation et de la miscibilité de jets gravitaires au-dessous d’un liquide ambiant. Des expériences ont été réalisées en laboratoire à l’aide d’une plateforme expérimentale constituée d’un bassin parallélépipédique contenant de l’eau douce et d’un canal d’injection de section rectangulaire de jets gravitaires de concentration constante initiale fixée. Les calculs mathématiques et numériques sont basés sur les modèles RANS (Reynolds-Averaged Navier Stokes equations), k-ε (K-epsilon) et DCE (Di

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6

Buchanan, Katherine Ann. "The social, geographical, and structural environments of minor noble residences in Angus, 1449-1542." Thesis, University of Stirling, 2014. http://hdl.handle.net/1893/21135.

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Relying upon two common trends in modern castle studies, this exploratory study works to combine the landscape context and the spatial interaction of the main building to create an assessment of the spatial and social interaction between the main residential structure of a noble’s estate and the landscape features attached to surrounding property features. To explore questions about this kind of interaction this project has taken the sheriffdom of Angus, Scotland, between the year 1450 and 1542, to examine non-royal residences in an area that offered a diverse topography. This project aims to

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7

Chattopadhyay, Mohar. "Gravity wave parameterization in the general circulation model." Thesis, University of Canterbury. Physics and Astronomy, 2003. http://hdl.handle.net/10092/6065.

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Although there is a rich literature on modelling the effects of broad spectrum gravity waves (GW) in General circulation Models (GCM), the effect of a coupled interactive broad spectrum and monochromatic GW has not been studied in detail. Such a study is of paramount importance as it could conclusively demonstrate that the coupled interactive broad spectrum and monochromatic GW can be parameterized in a GCM and its effects on atmospheric circulations can be studied. The main objective of this thesis is to investigate how the climate simulated by the Unified Model (UM), a state-of-the-art GCM,

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8

Hall, David. "A mathematical model for rapid gravity filter backwashing." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272201.

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9

Raizner, Carina. "GOCE data and gravity field model filter comparison." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2007. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-34036.

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10

Driver, David. "BREXIT: The Swedish Perspective : A Gravity Model Approach." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264219.

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The subject of trade negotiations has been a highly publicised debate in the context of Brexit. The term ‘no deal’ has come to represent the United Kingdom leaving with no specific or comprehensive preferential trade agreement, whereas the potentially most far-reaching deal would resemble something along the lines of an EFTA membership. By using bilateral trade data between 2005 and 2017 for Sweden and their top 60 trading partners, an elaborated gravity model for trade suggests a significant long-run decline in the magnitude of trade between Sweden and the United Kingdom. For trade in goods,

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11

Rodriguez, Ameal Carlos <1997&gt. "A Bayesian Gravity Model for Italian domestic tourism." Master's Degree Thesis, Università Ca' Foscari Venezia, 2021. http://hdl.handle.net/10579/20003.

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The gravity model has been used extensively to model trade flows among countries with proven succcess, and when applied to tourism flows it have provided even better results. In this paper I propose a Bayesian approach based on a MCMC algorithm to estimate the coefficients of the model. Then I apply this method to a Panel Data dataframe with the monthly number of tourists travelling from every Italian region to every Italian province between 2008 and 2018. Then I use it to predict the flows for 2019 and I compare the results.

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12

Lilienthal, Friederike, P. Sácha, and Christoph Jacobi. "Gravity wave effects on a modeled mean circulation." Universität Leipzig, 2015. https://ul.qucosa.de/id/qucosa%3A16646.

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Using a global circulation model of the middle atmosphere we analyze the influence of different tropospheric gravity wave amplitude distributions in the gravity wave parameterization on the mean circulation. Thereby we compare the standard configuration, which includes a simple zonal mean weighting of gravity wave amplitudes with a more realistic zonal mean weighting obtained from measurements using GPS radio occultations and a GW distribution in both latitude and longitude. The results show a stronger polar vortex and a descent of the meridional wind jet in the mesopause. Furthermore, two-dim

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13

Da, Silva Caroline Dos Santos. "Cosmic strings and scalar tensor gravity." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4577/.

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This thesis is concerned with the study of cosmic strings. We studied the values for the Higgs mass and string coupling for which the gravitational effect of an infinite cosmic string in the context of the Einstein theory is not only locally but also globally weak. We conclude this happens for strings formed at scales less or equal to the Planck one with Higgs mass being less or equal to the boson vectorial mass. Then we examined the metric of an isolated self-gravitating abelian-Higgs vortex in dilatonic gravity for arbitrary coupling of the vortex fields to the dilaton. We looked for solutio

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14

Pearl, Jason. "Quadrature-Based Gravity Models for the Homogeneous Polyhedron." ScholarWorks @ UVM, 2019. https://scholarworks.uvm.edu/graddis/1166.

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A number of missions to comets and asteroids have been undertaken by major space organizations driving a need to accurately characterize their gravitational fields. This is complicated however by their irregular shapes. To accurately and safely navigate spacecraft in these environments, a simple point-mass gravity model is insufficient and instead higher-fidelity models are required. Several such models exist for this purpose but all posess drawbacks. Moreover, there are some applications for which the currently available models are not particular well suited. In this dissertation, numerical q

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15

Bonacorsi, Laura. "Essays in International Trade." Thesis, Boston College, 2016. http://hdl.handle.net/2345/bc-ir:107278.

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Thesis advisor: James E. Anderson<br>The gravity model proved to to be one of the most successful framework for analyzing international trade flows, being referred to as the “workhorse” in the international trade literature (Head and Mayer (2014)). Microfoundations to this model has been provided in Anderson (1979) and it has often been employed to estimate the effects of a variety of trade policies (see Cipollina and Salvatici (2010) for a meta-analysis on reciprocal trade agreements, Rose (2000) for the effects of currency unions). The two chapters of this dissertation, which are independent

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16

Nicotra, Alessandro. "Analytical map between EPRL spin foam models in loop quantum gravity." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23179/.

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Loop Quantum Gravity (LQG) is one of the theoretical frameworks attempting to build a quantum theory of gravitation. Spin Foam theory provides a regularized, background-independent, and Lorentz covariant path integral for the transition amplitudes between LQG kinematical states. The state of the art of the theory is the EPRL model, formulated with the Euclidean and the Lorentzian signatures. They differ by their gauge group structures, which are respectively SO(4,R) and SO(1,3). The first is a compact group: it has finite-dimensional unitary irreducible representations, and the integral on

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17

Radzevičiūtė, Eglė. "Assessment of foreign direct investment by gravity model approach." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130129_192400-56972.

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In the thesis foreign direct investment in the Baltic countries using gravity model have been analysed. The first part of the thesis consists of foreign direct investment definition, the positive and negative influencing factors of foreign direct investment evaluation criteria analysis of the scientific literature and the authors different approaches to them. It is also made a critical evaluation of literature, authors usually distinguishing factors mentioned in different sources that affect foreign direct investment. Also in the first part of the paper theoretically gravity model and its appl

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18

Tang, Hon Cheong 1980. "Gravity-based trust model for web-based social networks." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112366.

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Web-based social networks have become one of the most popular applications on the Internet in recent years. However, most of the social networks rely on some simplistic trust models to manage trust information of the users, which can cause problems ranging from unsatisfied user experience to exposure to malicious users. This thesis proposes a gravity-based trust model to enhance the aggregation of personal trust information into a subjective reputation system. This new model maps all users on the social network into n-dimensional Euclidean spaces based on their direct trust information, and cr

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19

LeSage, James P., and Manfred M. Fischer. "Conventional versus network dependence panel data gravity model specifications." WU Vienna University of Economics and Business, 2019. http://epub.wu.ac.at/6828/1/2019%2D2%2D11_v12_panel_gravity_model.pdf.

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Past focus in the panel gravity literature has been on multidimensional fixed effects specifications in an effort to accommodate heterogeneity. After introducing conventional multidimensional fixed effects, we find evidence of cross-sectional dependence in flows. We propose a simultaneous dependence gravity model that allows for network dependence in flows, along with computationally efficient Markov Chain Monte Carlo estimation methods that produce a Monte Carlo integration estimate of log-marginal likelihood useful for model comparison. Application of the model to a panel of trade

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20

Skopovi, Ivan 1976. "A model for nonlinear gravity waves in stratified flows." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/91372.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, September 2002.<br>"August 2002."<br>Includes bibliographical references (leaves 77-78).<br>by Ivan Skopovi.<br>S.M.

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21

Romero, Jose Renato Sanchez. "Topics in gauge/gravity dualities." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-13012015-121829/.

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This thesis consists in a self-contained study of gauge/gravity dualities in the line of the Klebanov-Witten model. Here we explore first the known Maldacena duality that relates N=4 SYM theory in four dimensions to type IIB supergravity on AdS_5×S^5 in reasonable detail, after some necessary preliminaries on supersymmetric gauge theories, where we display in detail the supersymmetry algebra and representations for N 1 supersymmetry. There we also construct the so-called superfields that will be helpful to write invariant lagrangians for gauge theoriesmreadily, and then useful to construct th

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22

Eshagh, Mehdi. "On Satellite Gravity Gradiometry." Doctoral thesis, Stockholm : Skolan för arkitektur och samhällsbyggnad, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10429.

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23

Yamashita, Yasuho. "Embedding Ghost-free Bigravity into Higher-Dimensional Gravity." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225402.

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24

Heliani, Leni Sophia. "Determination of the Indonesian gravity fields from combination of surface gravity, satellite altimeter and digital terrain model data." 京都大学 (Kyoto University), 2003. http://hdl.handle.net/2433/149084.

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25

Olsson, Agneta. "Sweden´s Affinity towards Czech Republic : - A Gravity Model Approach." Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Nationalekonomi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-15266.

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Abstract It is well known that geographical distances between nations cause differences in cul-tural resemblances as well as affinity. Defined, affinity is inheriting similarities between nations in familiarity, language and mutual understanding. It cause variations in the uni-lateral trade volume flowing towards the destination countries and can be estimated by a traditional gravity model (GM). So far Swedish affinity towards Czech Republic (CZ) has remained unexplored. Hence, this paper investigates Swedish firm´s export perfor-mance and affinity towards CZ, both through the aggregate export

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26

Davids, Stefan. "A state sum model for (2+1) Lorentzian quantum gravity." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391393.

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27

Cain, Donneil. "The gravity model of international trade : econometric properties and applications." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/43400/.

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This thesis reviews the literature, simulates and applies the Gravity Model of International Trade. The gravity model is widely used in international trade to examine trade ﬂows within a network of exporters and importers. It describes the push and pull factors of trade ﬂows and is fast becoming the most favoured tool when estimating the welfare eﬀects of a trade policy. Therefore, estimating an accurate baseline equation is critical to correctly identify the welfare eﬀects of trade and accompanying trade policies. Recent developments in the literature on the gravity model have helped in this

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28

Beiki, Majid. "New Techniques for Estimation of Source Parameters : Applications to Airborne Gravity and Pseudo-Gravity Gradient Tensors." Doctoral thesis, Uppsala universitet, Geofysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-143015.

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Gravity gradient tensor (GGT) data contains the second derivatives of the Earth’s gravitational potential in three orthogonal directions. GGT data can be measured either using land, airborne, marine or space platforms. In the last two decades, the applications of GGT data in hydrocarbon exploration, mineral exploration and structural geology have increased considerably. This work focuses on developing new interpretation techniques for GGT data as well as pseudo-gravity gradient tensor (PGGT) derived from measured magnetic field. The applications of developed methods are demonstrated on a GGT d

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Probst, Jonas. "Applications of the gauge/gravity duality." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:970c6e71-371f-442f-94c9-8f1fffc8a4f7.

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This thesis investigates applications of the gauge/gravity duality to strongly coupled quantum field theories. After a review of the duality and of correlators and transport in quantum systems, we present our results on second-order non-conformal hydrodynamics. We derive new Kubo formulae for five second-order transport coefficients in non-conformal relativistic fluids. We then apply these Kubo formulae to a class of non-conformal holographic fluids at infinite coupling. We find strong evidence that the Haack-Yarom identity, known to relate second-order coefficients in conformal holographic fl

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30

Marchildon, Miguel. "An Application of the Gravity Model to International Trade in Narcotics." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37258.

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The transnational traffic of narcotics has had undeniable impacts on international development, for instance, stagnant economic growth in Myanmar (Chin, 2009), unsustainable agricultural practices in Yemen (Robins, 2016), and human security threats in Columbia (Thoumi, 2013). Furthermore, globalization is a catalyst for the transnational narcotics traffic (Robins, 2016; Aas, 2007; Kelly, Maghan & Serio, 2005). Several qualitative studies exist on the transnational narcotics traffic, yet few quantitative studies examine the issue. There is thus an opportunity for novel quantitative studies on t

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Fonte, Daniel John. "Implementing a 50x50 gravity field model in an orbit determination system." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/49587.

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So, Tat-man. "Internal migration in Hong Kong, 1971-1981 : a gravity model analysis /." [Hong Kong : University of Hong Kong], 1985. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12318358.

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Fellner, Johannes Josef. "Numerical study on orthometric heights using a synthetic Earth gravity model." Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/1047.

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The fundamental problem of orthometric heights is that the mean gravity value cannot be determined due to the lack of precise topographical mass information. This thesis employs a global synthetic Earth gravity model, based on known and simulated global masses, in order to circumvent this problem. Applying forward gravity modelling techniques, the behaviour of gravity inside the topography as well as orthometric heights are studied in detail.

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Sugishita, Sotaro. "Construction of a new model generating three-dimensional random volumes:Towards a formulation of membrane theory." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215308.

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Drottz, Per, and David Lantz. "Sweden’s Commodity Export Potential - A Gravity Approach : South-Korea." Thesis, Jönköping University, JIBS, Economics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-6832.

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<p>This bachelor thesis aims to estimate Sweden’s export potential towards South-Korea since initial data indicates that Sweden has from 1997 up until 2005 been exporting less to South-Korea when compared to, in general, OECD. Furthermore, South-Korea seems to be a low prioritized market for Swedish firms in the East-Asian region. As many before us, we have used a basic gravity model, including GDP and distance in kilometer has been used as explanatory variables for the observed trade value. The dummy variable land-locked, to estimate trade potential for 15 commodity groups. Sweden was set to

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36

Wu, Lichuan. "Introducing Surface Gravity Waves into Earth System Models." Doctoral thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-314760.

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Surface gravity waves alter the turbulence of the bottom atmosphere and the upper ocean. Accordingly, they can affect momentum flux, heat fluxes, gas exchange and atmospheric mixing. However, in most state-of-the-art Earth System Models (ESMs), surface wave influences are not fully considered or even included. Here, applying surface wave influences into ESMs is investigated from different aspects. Tuning parameterisations for including instantaneous wave influences has difficulties to capture wave influences. Increasing the horizontal resolution of models intensifies storm simulations for both

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37

Zhao, Yang, and Min Zhang. "The Ising Model on a Heavy Gravity Portfolio Applied to Default Contagion." Thesis, Högskolan i Halmstad, Tillämpad matematik och fysik (MPE-lab), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-16459.

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In this paper we introduce a model of default contagion in the financail market. The structure of the companies are represented by a Heavy Gravity Portfolio, where we assume there are N sectors in the market and in each sector i, there is one big trader and ni supply companies.The supply companies in each sector are directly inuenced by the bigtrader and the big traders are also pairwise interacting with each other.This development of the Ising model is called Heavy gravity portfolioand according to this, the relation between expectation and correlationof the default of companies are derived b

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Thai, Tri Do. "A gravity model for trade between Vietnam and twenty-three European countries." Thesis, Högskolan Dalarna, Nationalekonomi, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:du-2160.

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This thesis examines the bilateral trade between Vietnam and twenty three European countries based on a gravity model and panel data for years 1993 to 2004. Estimates indicate that economic size, market size and real exchange rate of Vietnam and twenty three European countries play major role in bilateral trade between Vietnam and these countries. Distance and history, however, do not seem to drive the bilateral trade. The results of gravity model are also applied to calculate the trade potential between Vietnam and twenty three European countries. It shows that Vietnam’s trade with twenty thr

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Bai, Lu. "Effects of global financial crisis on Chinese export: a gravity model study." Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Economics, Finance and Statistics, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-18297.

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Barazanji, Deleer. "Model Based Estimation of Height of Center of Gravity in Heavy Vehicles." Thesis, KTH, Matematik (Inst.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92571.

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Abstract The center of gravity height in a vehicle a ects its dynamic driving properties but there is no accurate way of measuring the height of center of gravity today. One example of vehicle stabilizing systems is vehicle rollover warning and assist system which has to rely on a relatively accurate height of center of gravity estimate in order to be implemented in vehicles e_ciently and would otherwise be considered useless. In this thesis a literature study on the height of center of gravity in heavy vehicles in general and semitrailers in particular is conducted at Scania CV and emphasis

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41

Thanyakhan, Sutana. "The Determinants of FDI and FPI in Thailand: a Gravity Model Analysis." Phd thesis, Lincoln University. Commerce Division, 2008. http://theses.lincoln.ac.nz/public/adt-NZLIU20080429.102238/.

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Thailand has been one of significant recipients of foreign direct investment (FDI) among developing countries over the last 30 years, and has recorded rapid and sustained growth rates in a number of different industrial categories. Thailand has shown a clear policy transition for foreign investment over time from an import-substitution regime to an export-oriented regime. Before the 1997 Asian Financial Crisis (1985-1996), Thailand had the fastest growing level of exports in manufactured goods among Asian economies. FDI plays a significant role in the Thai economy. Thailand has been pursuing d

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Tajmar, Martin. "Derivation of the Planck and Fine-Structure Constant from Assis’s Gravity Model." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-173411.

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Presently, Planck’s constant is a fundamental constant that can not be derived from other onstants. Assis developed a model based on an extended Weber-type potential energy, that allows calculating gravitational-type forces from neutral oscillating electric dipoles. Here we show that the maximum possible point-mass in his model equals the Planck mass which allows us to derive Planck’s constant and the fine-structure constant. We match the exact order of magnitude only requiring a pre-factor that is present in all Weber-type theories and has to be determined empirically. This classical model al

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Xu, Albert. "Investigating the Effects of Cultural Distance on the Gravity Model of Trade." Scholarship @ Claremont, 2017. http://scholarship.claremont.edu/cmc_theses/1568.

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The gravity model of trade is the workhorse model for international trade. In its most basic form, it stipulates that bilateral trade flow between two countries is proportional to the countries’ Gross Domestic Product (GDP) and the distance between them. According to the gravity model, the elasticity of trade flows to distance, or the “distance effect,” has increased since the early 1970s, a confounding empirical result known as the “distance puzzle.” This paper investigates the distance effect more closely by decomposing it. More specifically, it aims to isolate the effects from culture, cons

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Mead, Alexander James. "Demographics of dark-matter haloes in standard and non-standard cosmologies." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9951.

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This thesis explores topics related to the formation and development of the large-scale structure in the Universe, with the focus being to compute properties of the evolved non-linear density field in an approximate way. The first three chapters form an introduction: Chapter 1 contains the theoretical basis of modern cosmology, Chapter 2 discusses the role of N-body simulations in the study of structure formation and Chapter 3 considers the phenomenological halo model. In Chapter 4 a novel method of computing the matter power spectrum is developed. This method uses the halo model directly to m

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Exner, Andreas. "The European Union and the Euro : A Gravity Approach on Bilateral Trade." Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Nationalekonomi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-21662.

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In the year of 1999 a new monetary experiment commenced – the birth of the euro. Over the years more countries have joined the new currency and it was expected to be a continuously growing community. The purpose of this paper is to measure the effect of European membership, the currency of euro and the financial crisis on trade between the countries located in Europe. For the task of this paper the gravity model is used to study the bilateral trade flows in the European Union from 1995-2011. It additionally investigates, besides the correlation between GDP and distance, the effect of shared bo

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Dev, Abha, Deepak Jain, S. Jhingan, S. Nojiri, M. Sami, and I. Thongkool. "Delicate f(R) gravity models with a disappearing cosmological constant and observational constraints on the model parameters." American Physical Society, 2008. http://hdl.handle.net/2237/11278.

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Santos, Ignacio. "Simulation and Study of Gravity Assist Maneuvers." Thesis, KTH, Rymdteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-276462.

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This thesis takes a closer look at the complex maneuver known as gravity assist, a popular method of interplanetary travel. The maneuver is used to gain or lose momentum by flying by planets, which induces a speed and direction change. A simulation model is created using the General Mission Analysis Tool (GMAT), which is intended to be easily reproduced and altered to match any desired gravity assist maneuver. The validity of its results is analyzed, comparing them to available data from real missions. Some parameters, including speed and trajectory, are found to be extremely reliable. The mod

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Gao, Shen. "The Predictive Capacity of the Gravity Model of Trade on Foreign Direct Investment." Thesis, Uppsala University, Department of Economics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-102534.

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<p>The link between foreign direct investments (FDI) and trade is firmly established in economic literature. Yet despite the vast amount of literature on this subject, very few have tried to look at FDI through the lens of trade theory, choosing rather to approach the subject on either a macroeconomic-level or on firm-level. The purpose and scope of this paper is to explore FDI through the lens of trade-theory. The central questions in this thesis are whether the gravity model of trade can serve as a reliable model for FDI value as well? Are there certain variables in the gravity model that ar

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Yokokura, Yuki. "A Self-consistent Model of the Black Hole Evaporation and Entropy in Gravity." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188488.

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Wang, Daoyan. "On c=1 matrix model and 2D gravity - with emphasis on chiral formalism." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/5526.

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In this thesis, we study the relationship between the effective spacetime theory of Liouville string theory in two spacetime dimensions and the collective field of the c=1 matrix model by finding exact solutions on both sides. The correspondence between the matrix model and the effective spacetime theory turns out to be nonlinear in their fields. By comparing the exact solutions on both side, we show the nonlinearity begins to appear at the second order in terms of the incoming tachyon field. In particular, we employ the chiral formalism in the matrix model the formalism allowing to write down

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