Relevant bibliographies by topics / Spatial stability analysis

Academic literature on the topic 'Spatial stability analysis'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Spatial stability analysis"

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Bischof, Walter F., and Terry Caelli. "Parsing scale-space spatial stability analysis." Computer Vision, Graphics, and Image Processing 41, no. 2 (February 1988): 263. http://dx.doi.org/10.1016/0734-189x(88)90025-4.

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Lajús, F. C., A. Sinha, A. V. G. Cavalieri, C. J. Deschamps, and T. Colonius. "Spatial stability analysis of subsonic corrugated jets." Journal of Fluid Mechanics 876 (August 8, 2019): 766–91. http://dx.doi.org/10.1017/jfm.2019.573.

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The linear stability of high-Reynolds-number corrugated jets is investigated by solving the compressible Rayleigh equation linearized about the time-averaged flow field. A Floquet ansatz is used to account for periodicity of this base flow in the azimuthal direction. The origin of multiple unstable solutions, which are known to appear in these non-circular configurations, is traced through gradual perturbations of a parametrized base-flow profile. It is shown that all unstable modes are corrugated jet continuations of the classical Kelvin–Helmholtz modes of circular jets, highlighting that the same instability mechanism, modified by corrugations, leads to the growth of disturbances in such flows. It is found that under certain conditions the eigenvalues may form saddles in the complex plane and display axis switching in their eigenfunctions. A parametric study is also conducted to understand how penetration and number of corrugations impact stability. The effect of these geometric properties on growth rates and phase speeds of the multiple unstable modes is explored, and the results provide guidelines for the development of nozzle configurations that more effectively modify the Kelvin–Helmholtz instability.
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Vera, J. Fernando, José M. Angulo, and Juan A. Roldán. "Stability analysis in nonstationary spatial covariance estimation." Stochastic Environmental Research and Risk Assessment 31, no. 3 (February 17, 2016): 815–28. http://dx.doi.org/10.1007/s00477-016-1228-4.

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Bischof, Walter F., and Terry Caelli. "Parsing scale-space and spatial stability analysis." Computer Vision, Graphics, and Image Processing 42, no. 2 (May 1988): 192–205. http://dx.doi.org/10.1016/0734-189x(88)90163-6.

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Wang, Yu-Jie, and Paul Chiasson. "Stochastic stability analysis of a test excavation involving spatially variable subsoil." Canadian Geotechnical Journal 43, no. 10 (October 1, 2006): 1074–87. http://dx.doi.org/10.1139/t06-062.

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A stochastic slope stability analysis method is proposed to investigate the short-term stability of unsupported excavation works in a soft clay deposit having spatially variable properties. Spatial variability of undrained shear strength is modelled by a stochastic model that is the sum of a trend component and a fluctuation component. The undrained shear strength trend, which is also spatially variable, is modelled by kriging or a random function. Slope stability analyses are performed on the stochastic soft clay model to investigate the contribution of spatial variability of undrained shear strength to a disagreement among high factors of safety computed from deterministic methods for slopes that have failed. Probabilities of failure as computed from the stochastic analyses give a better assessment of failure potential. Probability of failure values also correlate with time delay before failure. This phenomenon may be related to progressive failure or creep and to pore pressure dissipation with time.Key words: slope stability analysis, failure probability, spatial variability, stochastic modelling, geostatistics, vane tests, sensitive clay.
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KIM, M. Y., S. P. CHANG, and S. B. KIM. "SPATIAL STABILITY ANALYSIS OF THIN-WALLED SPACE FRAMES." International Journal for Numerical Methods in Engineering 39, no. 3 (February 15, 1996): 499–525. http://dx.doi.org/10.1002/(sici)1097-0207(19960215)39:3<499::aid-nme867>3.0.co;2-z.

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Muller, André Luís, Eurípedes do Amaral Vargas, Luiz Eloy Vaz, and Clemente José Gonçalves. "Borehole stability analysis considering spatial variability and poroelastoplasticity." International Journal of Rock Mechanics and Mining Sciences 46, no. 1 (January 2009): 90–96. http://dx.doi.org/10.1016/j.ijrmms.2008.05.001.

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Getz, Michael C., Jasmine A. Nirody, and Padmini Rangamani. "Stability analysis in spatial modeling of cell signaling." Wiley Interdisciplinary Reviews: Systems Biology and Medicine 10, no. 1 (August 8, 2017): e1395. http://dx.doi.org/10.1002/wsbm.1395.

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Sandstede, Björn, and Arnd Scheel. "On the Stability of Periodic Travelling Waves with Large Spatial Period." Journal of Differential Equations 172, no. 1 (May 2001): 134–88. http://dx.doi.org/10.1006/jdeq.2000.3855.

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Bordenave, C. "Stability of spatial queueing systems." Advances in Applied Probability 38, no. 2 (June 2006): 487–504. http://dx.doi.org/10.1239/aap/1151337081.

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In this paper, we analyze a queueing system characterized by a space-time arrival process of customers served by a countable set of servers. Customers arrive at points in space and the server stations have space-dependent processing rates. The workload is seen as a Radon measure and the server stations can adapt their power allocation to the current workload. We derive the stability region of the queueing system in the usual stationary ergodic framework. The analysis of this stability region gives some counter-intuitive results. Some specific subclasses of policy are also studied. Wireless communications networks is a natural field of application for the model.
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Dissertations / Theses on the topic "Spatial stability analysis"

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FLORES, EMERSON ALEX FIGUEROA. "PROBABILISTIC ANALYSIS OF SLOPE STABILITY CONSIDERING SPATIAL VARIABILITY OF SOIL." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2008. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=12093@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Freqüentemente as análises de estabilidade de taludes são feitas por métodos determinísticos, nos quais é obtido um Fator de Segurança (FS). Estes métodos não quantificam as incertezas existentes nas variáveis de entrada (parâmetros de resistência) na análise. Tampouco mostram detalhes sobre qual variável afeta mais o resultado. Os métodos probabilísticos permitem superar estes problemas. A presente pesquisa tem como objetivo comparar dois métodos probabilísticos geralmente utilizados (Estimativas Pontuais e Segundo Momento). Três projetos utilizados comumente na geotecnia são analisados: barragem de rejeitos, talude de solo e aterro sobre argila mole.Um aspecto importante na análise probabilística é a quantificação adequada do desvio padrão. É sabido que as propriedades dos solos mostram uma correlação no espaço, pelo que o desvio padrão calculado por métodos clássicos da estatística é superestimado em comparação ao valor real no campo. El-Ramly (2001) desenvolveu uma metodologia para o cálculo da probabilidade de ruptura considerando a correlação espacial das propriedades do solo. Esta metodologia é de difícil aplicação prática. Serão, portanto, avaliadas na presente pesquisa as técnicas geralmente usadas de probabilidade e estabilidade de taludes, juntamente com um fator de correção proposto por Vanmarcke (1977a). Estas técnicas de probabilidade de estabilidade de taludes são factíveis de serem utilizadas junto com este fator de correção. Verificou-se que o Método de Segundo Momento é de mais fácil utilização, e portanto adequado para emprego em projetos geotécnicos.
The analysis of slope stability is often determined by deterministic methods, in which a Factor of Security (FS) is obtained. These methods do not quantify the uncertainty in the input variables (strength parameters). Neither these methods show details which variable affects mostly the outcome results. The probabilistic methods allow overcoming these restrictions. This study aims at comparing two probabilistic methods of general use (Point Estimates and First Order Second Moment). Three projects commonly used in geotechnical engineering are analyzed: tailings dam, slope soil and embankment on soft clay. An important aspect of the probabilistic analysis is the proper quantification of the standard deviation. It is known that the soil properties show a correlation in space, so the standard deviation, calculated by traditional methods of statistics, is overestimated when compared to the real field value. El-Ramly (2001) developed a methodology for calculating the probability of failure considering the spatial correlation of the soil properties. This methodology is difficult to apply in practice. The present study will therefore evaluate the techniques generally used in probability of failure of slopes. These probability techniques applied to slope stability can be used together with a correction factor proposed by Vanmarcke (1977b). The Second Moment Method was found to be easier to use, and therefore more suitable for geotechnical projects.
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MULLER, ANDRE LUIS. "NUMERICAL BOREHOLE STABILITY ANALYSIS CONSIDERING SPATIAL VARIABILITY AND FLUID-MECHANICAL COUPLING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2007. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=10457@1.

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FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO
Em geral, a análise da estabilidade e a análise das respostas de poços de petróleo são realizadas de forma determinística em relação às propriedades mecânicas e hidráulicas do meio rochoso. No entanto, sabe- se que os meios rochosos e em particular rochas sedimentares, podem mostrar um considerável grau de heterogeneidades, em micro, meso e macro-escala. Essas heterogeneidades produzem variabilidade espacial nas propriedades mecânicas e hidráulicas dos meios rochosos. Essa variabilidade mostra em geral um caráter espacial pronunciado. O presente estudo propõe o desenvolvimento de procedimentos de análise numérica, utilizando elementos finitos, de processos fluido mecânicos acoplados, monofásicos e bifásicos, que levem em conta a variabilidade espacial de propriedades hidráulicas e mecânicas e a variabilidade das condições iniciais de tensões e poro pressões. Nesse estudo, empregam-se os procedimentos numéricos desenvolvidos em duas fases distintas. Na análise probabilística da estabilidade de poços e na análise probabilística das respostas dos poços durante a produção, considerando o acoplamento fluido mecânico com fluxo bifásico.
In general, borehole stability analysis and borehole response analysis are carried out considering that both hydraulic and mechanical parameters of the rock mass are deterministic. However, it is a well known fact, that rock masses and in particular sedimentary rock masses may show a considerable degree of heterogeneity, in micro, meso and macro scale. These heterogeneities produce spatial variability in mechanical and hydraulic properties of the rock medium. This variability can be very pronounced. The present work proposes the development of numerical analysis procedures, using finite elements, in order to analyze single and two phases flow, coupled fluid mechanical processes that take into account the spatial variability of hydraulic and mechanical properties and the variability of the initial stresses and pore pressures. In this study, the developed numerical procedures are used in two distinct phases. In the borehole stochastic stability analysis and in the borehole stochastic response analysis during the production, considering fluid mechanical coupling and two phase flow.
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Burke, Tommy. "Evaluation of visualisations of geographically weighted regression, with perceptual stability." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/15680.

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Given the large volume of data that is regularly accumulated, the need to properly manage, efficiently display and correctly interpret, becomes more important. Complex analysis of data is best performed using statistical models and in particular those with a geographical element are best analysed using Spatial Statistical Methods, including local regression. Spatial Statistical Methods are employed in a wide range of disciplines to analyse and interpret data where it is necessary to detect significant spatial patterns or relationships. The topic of the research presented in this thesis is an exploration of the most effective methods of visualising results. A human being is capable of processing a vast amount of data as long as it is effectively displayed. However, the perceptual load will at some point exceed the cognitive processing ability and therefore the ability to comprehend data. Although increases in data scale did increase the cognitive load and reduce processing, prior knowledge of geographical information systems did not result in an overall processing advantage. The empirical work in the thesis is divided into two parts. The first part aims to gain insight into visualisations which would be effective for interpretation and analysis of Geographically Weighted Regression (GWR), a popular Spatial Statistical Method. Three different visualisation techniques; two dimensional, three dimensional and interactive, are evaluated through an experiment comprising two data set sizes. Interactive visualisations perform best overall, despite the apparent lack of researcher familiarity. The increase in data volume can present additional complexity for researchers. Although the evaluation of the first experiment augments understanding of effective visualisation display, the scale at which data can be adequately presented within these visualisations is unclear. Therefore, the second empirical investigation seeks to provide insight into data scalability, and human cognitive limitations associated with data comprehension. The general discussion concludes that there is a need to better inform researchers of the potential of interactive visualisations. People do need to be properly trained to use these systems, but the limits of human perceptual processing also need to be considered in order to permit more efficient and insightful analysis.
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Wu, Kai. "Vibration and Stability of Continuous Systems| New Parametric Instability Analysis and Spatial Discretization Method." Thesis, University of Maryland, Baltimore County, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10841201.

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Parametric instability in a system is caused by periodically varying coefficients in its governing differential equations. Parametric instability regions of a second-order non-dispersive distributed structural system in this work are obtained using the wave solution and the fixed point theory without spatially discretizing the governing partial differential equation. The parametric instability regions are classified as period-1 and period- i (i > 1) instability regions, where the former is analytically obtained, and the latter can be numerically calculated using bifurcation diagrams. The parametric instability phenomenon is characterized by a bounded displacement and an unbounded vibratory energy, due to formation of infinitely compressed shock-like waves. Parametric instability in a taut string with a periodically moving boundary is then investigated. The free linear vibration of the taut string is studied first, and three corresponding nonlinear models are introduced next. It is shown that the responses and vibratory energies of the nonlinear models are close to those of the linear model, which indicates that the parametric instability in the linear model can also exist in the nonlinear models.

A new global spatial discretization method for one- and two-dimensional continuous systems is investigated. General formulations for one- and two-dimensional systems that can achieve uniform convergence are established, whose displacements are divided into internal terms and boundary-induced terms. For one-dimensional systems, natural frequencies, mode shapes, harmonic steady-state responses, and transient responses of a rod and a tensioned Euler-Bernoulli beam are calculated using the new method and the assumed modes method, and results are compared with those from exact analyses. The new method gives better results than the assumed modes method in calculating eigensolutions and responses of a system, and it can use sinusoidal functions as trial functions for the internal term rather than possibly complicated eigenfunctions in exact analyses. For two-dimensional systems, natural frequencies and dynamic responses of a rectangular Kirchhoff plate that has three simply-supported boundaries and one free boundary with an attached Euler-Bernoulli beam are calculated using both the new method and the assumed modes method, and compared with results from the finite element method and the finite difference method, respectively. Advantages of the new method over local spatial discretization methods are fewer degrees of freedom and less computational effort, and those over the assumed modes method are better numerical property, a faster calculation speed, and much higher accuracy in calculation of high-order spatial derivatives of the displacement.

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Nardelli, P. H. (Pedro Henrique Juliano). "Analysis of the spatial throughput in interference networks." Doctoral thesis, Oulun yliopisto, 2013. http://urn.fi/urn:isbn:9789526201818.

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Abstract In this thesis we study the spatial throughput of interference-limited wireless networks from different perspectives, considering that the spatial distribution of nodes follows a 2-dimensional homogeneous Poisson point process and transmitters employ Gaussian point-to-point codes. To carry out this analysis, we model the interrelations between network elements using concepts from stochastic geometry, communication theory and information theory. We derive closed-form equations to compute/approximate the performance metric that is chosen to evaluate the system for each given specific scenario. Our first contribution is an investigation about whether it is preferable to have a large number of short single-hop links or a small number of long hops in multi-hop wireless networks, using a newly proposed metric denominated aggregate multi-hop information efficiency. For single-hop systems, we revisit the transmission capacity framework to study medium access protocols that use asynchronous transmissions and allow for packet retransmissions, showing when a carrier sensing capability is more suitable than synchronous transmissions, and vice-versa. We also cast the effective link throughput and the network spatial throughput optimization problems to find the combination of medium access probability, coding rate and maximum number of retransmissions that maximize each metric under packet loss and queue stability constraints, evincing when they do (and do not) have the same solution. Furthermore we analyze the expected maximum achievable sum rates over a given area – or spatial capacity – based on the capacity regions of Gaussian point-to-point codes for two decoding rules, namely (i) treating interference as noise (IAN) and (ii) jointly detecting the strongest interfering signals treating the others as noise (OPT), proving the advantages of the second. We additionally demonstrate that, when the same decoding rule and network density are considered, the spatial-capacity-achieving scheme always outperforms the spatial throughput obtained with the best predetermined fixed rate strategy. With those results in hand, we discuss general guidelines on the construction of ad hoc adaptive algorithms that would improve the information flow throughout the interference network, respecting the nodes’ internal and external constraints
Tiivistelmä Tässä työssä tutkitaan häiriörajoitteisten langattomien verkkojen tila-alueen suorituskykyä, olettaen verkkosolmujen sijoittuvan 2-ulotteisen Poissonin pisteprosessin mukaisesti, sekä olettaen lähettimien hyödyntävän Gaussisia pisteestä-pisteeseen -koodeja. Suorituskykyanalyysi pohjautuu stokastiseen geometriaan, tietoliikenneteoriaan sekä informaatioteoriaan. Suljetun muodon suorituskyky-yhtälöitä hyödyntäen arvioidaan suorityskykymetriikoita eri skenaarioissa. Työn aluksi esitetään uusi monihyppyverkkojen informaatiotehokkuuteen perustuva metriikka. Sen avulla voidaan tutkia onko tehokkaampaa käyttää useita lyhyen hypyn linkkejä vai pienempää määrää pidempien hyppyjen linkkejä. Yhden hypyn verkoissa tutkitaan mediaanpääsyprotokollia asynkronisissa verkoissa pakettien uudelleenlähetykseen perustuen ja verrataan tätä synkroniseen lähetykseen ilman vapaan kanavan tunnistusmekanismia. Työssä tutkitaan myös linkin efektiivisen suorituskyvyn ja verkon tila-alueen suorituskyvyn optimointia, jotta sopiva yhdistelmä mediaan pääsyn todennäköisyydelle, koodausnopeudelle ja uudelleenlähetysten maksimilukumäärälle löytyisi ja samalla maksimoisi jokaisen käytetyn metriikan ehdollistettuna paketin menetyksille ja jonon stabiilisuudelle. Lisäksi arvioidaan maksimaalista odotettavaa nettosiirtonopeutta tietyllä alueella, eli tila-alueen kapasiteettia, Gaussimaisen pisteestä-pisteeseen koodien kapasiteettialueisiin perustuen kahta eri dekoodaussääntöä hyödyntäen: (i) olettaen häiriön olevan kohinaa tai (ii) ilmaisemalla voimakkaimmat häiriösignaalit ja olettaen muiden olevan kohinaa. Jälkimmäinen osoittautui tehokkaammaksi menetelmäksi. Työssä osoitetaan myös, että samalla dekoodaussäännöllä ja verkon tiheydellä tila-alueen kapasiteetin saavuttava menetelmä on aina tehokkaampi kuin tavanomainen tila-alueen suorituskykyyn perustuva kiinteän siirtonopeuden menetelmä. Saavutettujen tulosten valossa työssä esitetään yleisiä suunnittelumenetelmiä mukautuville ad hoc -algoritmeille, joiden avulla voidaan parantaa tiedonsiirtoa häiriörajoitteisissa verkoissa, ehdollistettuna verkon solmujen sisäisille ja ulkoisille rajoitteille
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Lutz, Eric Robert. "Spatial and temperal analysis of snowpack strength and stability and environmental determinants on an inclined, forest opening." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/lutz/LutzE0509.pdf.

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Avalanche hazard evaluation relies on snowpack stability observations. Because snowpack properties can vary extensively over time and space, estimating slope-scale stability is difficult. This study addressed these challenges by implementing a methodology that 1. quantified spatial and temporal patterns of snowpack stability, 2. identified spatial associations between the strength and stability of a weak layer and slab load, and radiation properties, 3. identified internal associations between weak layer thickness, shear strength, microstructural properties, and slab load. An instability associated with a buried surface hoar weak layer was examined on an inclined forest opening at Lionhead, southwest Montana, during February and March, 2005. During five sampling days, 824 snow depth and SnowMicroPen resistance profiles and 352 shear frame tests were performed. An objective texture-based stratigraphic sampling approach was developed to obtain microstructural estimates of a stratigraphic weakness and instability from SnowMicroPen profiles, utilizing the coefficient of variation of rupture force. Spatial models of hemispheric sky visibility, and incoming long- and shortwave radiation were generated for the surface hoar formation period using a Geographic Information System and independent optical observations. Despite relative topographic uniformity, in a distance of 30 m, the buried surface hoar weak layer thicknesses varied between 3 - 21 mm. Before burial, the surface hoar persisted despite moderate winds and above freezing air temperatures. Spatial patterns of modeled incoming longwave and shortwave radiation explained the large variation in weak layer thickness and strength properties. Areas exposed to large amounts of radiation contained a strong, thin buried surface hoar layer, while in areas with limited incoming longwave (due to high sky visibility) and shortwave radiation (due to shading), the layer was thicker and possessed low shear and microstructural strengths. Over time, the shear frame stability index and SnowMicroPen-derived microstrength of the surface hoar layer increased and values became spatially more variable (divergence): it became harder to predict stability as the snowpack became more stable. A loading event then decreased stability and micro-strength and caused spatial uniformity (convergence), thereby increasing predictive strength of observations. The findings illustrate the usefulness of the SnowMicroPen for evaluating spatial patterns and load-related changes in snowpack stability.
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Bressan, Nicola. "Spatial and temporal analysis of soil moisture patterns in an Alpine site in north Italy." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Soil moisture represents a crucial factor in the mass and energy exchanges between land and atmosphere. Thus, the knowledge of its spatial and temporal dynamic is fundamental for several hydrological, agricultural and climatological applications. The purpose of this study is to shed light on soil moisture patterns at catchment scale in alpine environment with focus on the role of climate, soil and topography. For this purpose, a dataset of 13 measurement points at two different depths for two years have been assessed. The analyses highlight significant differences in soil moisture at 5 and 20 cm, showing diverse influence of climate, topography and soil type on the two. We found that climate factors in the shallow layer contribute to 75% of the soil moisture variance and only 25% is related to topography and soil. On the other hand, at 20 cm the climatic and the time-invariant components (topography, soil, etc…) have almost equal weights in determining soil moisture spatial variance. The analysis on seasonal basis showed the presence of frozen-related phenomena during the winter season, which prevented a clear understanding of the diverse factors on the soil moisture spatial distribution and opened new potential researches on this topic. By contrast, during the summer season well-defined soil moisture patterns mainly controlled by climate and land use were observed. The presence of weak correlations with land data and high covariances during dry periods confirms that soil moisture is the result of an interaction of multiple components rather than the result of single controlling factor. The study extends the knowledge of soil moisture dynamic in alpine environment, confirming some outcomes found in previous studies and providing new evidences on site dependency. Moreover, a database for further hydrological researches, as well as practices for future surveys, have been settled.
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Diaz, Diaz Eliecer Rodrigo. "Hierarchical spatial structure and levels of resolution of intertidal grazing and their consequences on predictability and stability at small scales." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1005393.

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The aim of this research was to assess three hierarchical aspects of alga-grazer interactions in intertidal communities on a small scale: spatial heterogeneity, grazing effects and spatial stability in grazing effects. First, using semivariograms and cross-semivariograms I observed hierarchical spatial patterns in most algal groups and in grazers. However, these patterns varied with the level on the shore and between shores, suggesting that either human exploitation or wave exposure can be a source of variability. Second, grazing effects were studied using manipulative experiments at different levels on the shore. These revealed significant effects of grazing on the low shore and in tidal pools. Additionally, using a transect of grazer exclusions across the shore, I observed unexpected hierarchical patchiness in the strength of grazing, rather than zonation in its effects. This patchiness varied in time due to different biotic and abiotic factors. In a separate experiment, the effect of mesograzers effects were studied in the upper eulittoral zone under four conditions: burnt open rock (BOR), burnt pools (Bpool), non-burnt open rock (NBOR) and non-burnt pools (NBpool). Additionally, I tested spatial stability in the effects of grazing in consecutive years, using the same plots. I observed great spatial variability in the effects of grazing, but this variability was spatially stable in Bpools and NBOR, meaning deterministic and significant grazing effects in consecutive years on the same plots. Both the significance in grazing effects and spatial stability depended on the level of resolution (species, functional, biomass) at which the algal assemblage was evaluated, suggesting hierarchical variability. In order to be able to predict spatial variability in the effects of grazers in the upper eulittoral zone using biotic and abiotic micro- and macrofactors, a conceptual model was proposed, based on data from several multiple-regressions. This linked the interactions among three elements: idiosyncratic heterogeneity, micro and macrofactors. This suggests that spatial variability can be a product of these factors, while spatial stability can be caused by the same or different combinations of factors. In conclusion, grazing and other ecological phenomena must be studied hierarchically, not only through spatiotemporal scales, but also at different levels of resolution, as these also influence our perception of patterns.
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Peltonen, Joanna. "Effective Spatial Mapping for Coupled Code Analysis of Thermal–Hydraulics/Neutron–Kinetics of Boiling Water Reactors." Doctoral thesis, KTH, Kärnkraftsäkerhet, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-122088.

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Analyses of nuclear reactor safety have increasingly required coupling of full three dimensional neutron kinetics (NK) core models with system transient thermal–hydraulics (TH) codes.  In order to produce results within a reasonable computing time, the coupled codes use two different spatial description of the reactor core.  The TH code uses few, typically 5 to 20 TH channels, which represent the core.  The NK code uses explicit one node for each fuel assembly.  Therefore, a spatial mapping of a coarse grid TH and a fine grid NK domain is necessary.  However, improper mappings may result in loss of valuable information, thus causing inaccurate prediction of safety parameters. The purpose of this thesis is to study the effectiveness of spatial coupling (channel refinement and spatial mapping) and develop recommendations for NK/TH mapping in simulation of safety transients.  Additionally, sensitivity of stability (measured by Decay Ratio and Frequency) to the different types of mapping schemes, is analyzed against OECD/NEA Ringhals–1 Stability Benchmark data. The research methodology consists of spatial coupling convergence study, by increasing the number of TH channels and varying mapping approaches, up to and including the reference case.  The reference case consists of one-to-one mapping: one TH channel per one fuel assembly.  The comparisons of the results are done for steady–state and transient results.  In this thesis mapping (spatial coupling) definition is formed and all the existing mapping approaches were gathered, analyzed and presented.  Additionally, to increase the efficiency and applicability of spatial mapping convergence, a new mapping methodology has been proposed.  The new mapping approach is based on hierarchical clustering method; the method of unsupervised learning that is adopted by many researchers in many different scientific fields, thanks to its flexibility and robustness.  The proposed new mapping method turns out to be very successful for spatial coupling problem and can be fully automatized allowing for significant time reduction in mapping convergence study. The steady–state results obtained from three different plant models for all the investigated cases are presented.  All models achieved well converged steady–state and local parameters were compared and it was concluded that solid basis for further transient analysis was found.  Analyzing the mapping performance, the best predictions for steady–state conditions are the mappings that include the power peaking factor feature alone or with any combination of other features.  Additionally it is of value to keep the core symmetry (symmetry feature).  The big part of this research is devoted to transient analysis.  The selection of transients was done such that it covers a wide range of transients and gathered knowledge may be used for other types of transients.  As a representative of a local perturbation, Control Rod Drop Accident was chosen.  A specially prepared Feedwater Transient was investigated as a regional perturbation and a Turbine Trip is an example of a global one.  In the case of local perturbation, it has been found that a number of TH channels is less important than the type of mapping, so a high number of TH channels does not guarantee improved results.  To avoid unnecessary averaging and to obtain the best prediction, hot channel and core zone where accident happens should be always separated from the rest.  The best performance is achieved with mapping according power peaking factors, and therefore this one is recommended for such type of perturbation. The regional perturbation has been found to be more challenging than the others.  This kind of perturbation is strongly dependent on mapping type that affects the power increase rate, SCRAM time, onset of instability, development of limit cycle, etc.  It has been also concluded that a special effort is needed for input model preparation.   In contrast to the regional perturbation, the global perturbation is found to be the least demanding transient.  Here, the number of TH channels and type of mapping do not have significant impact on average plant behaviour – general plant response is always well recreated.  A special effort has also been paid to investigate the core stability performance, in both global and regional mode.  It has been found that in case of unstable cores, a low number of TH channels significantly suppresses the instability.  For these cases number of TH channels is very important and therefore at least half of the core has to be modeled to have a confidence in predicted DR and FR.  In case of regional instability in order to get correct performance of out-of-phase oscillations, it is recommended to use full-scale model.  If this is not possible, the mapping which is a mixture of 1st power mode and power peaking factors, should be used. The general conclusions and recommendations are summarized at the end of this thesis.  Development of these recommendations was one of the purposes of this investigation and they should be taken into consideration while designing new coupled TH/NK models and choosing mapping strategy for a new transient analysis.

QC 20130516

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Peltonen, Joanna. "Development of effective algorithm for coupled thermal-hydraulics : neutron-kinetics analysis of reactivity transient." Licentiate thesis, Stockholm : Skolan för teknikvetenskap, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11033.

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Books on the topic "Spatial stability analysis"

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Kesoretskikh, Ivan, and Sergey Zotov. Landscape vulnerability: concept and assessment. ru: INFRA-M Academic Publishing LLC., 2019. http://dx.doi.org/10.12737/1045820.

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The monograph presents a methodology for assessing the vulnerability of landscapes to external influences. A comparative analysis of the concepts of "stability", "sensitivity", "vulnerability" in relation to natural complexes. An overview of existing methods for assessing the vulnerability of natural complexes is presented. The author's method of assessing the vulnerability of landscapes to anthropogenic impacts is described. The methodology is based on: selection and justification of criteria for assessing the vulnerability of landscapes; preparation of a parametric matrix and gradation of assessment criteria in accordance with the developed vulnerability classes; calculation of weighting factors of vulnerability assessment parameters; selection of optimal territorial operational unit for landscape vulnerability assessment. The method is implemented in the GIS environment "Assessment of vulnerability of landscapes of the Kaliningrad region to anthropogenic impacts", created by the authors using modern geoinformation products. The specificity of spatial differentiation of different landscapes in terms of vulnerability to anthropogenic impacts at the regional and local levels is revealed. It is stated that the use of the methodology for assessing the vulnerability of landscapes to anthropogenic impacts and its integration into the system of nature management will ensure a balanced account of geoecological features and environmental priorities in territorial planning. It is of interest to specialists in the field of rational nature management, environmental protection, spatial planning.
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Miller, Nicholas R. Social Choice Theory and Legislative Institutions. Oxford University Press, 2016. http://dx.doi.org/10.1093/acrefore/9780190228637.013.1.

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This is an advance summary of a forthcoming article in the Oxford Research Encyclopedia of Politics. Please check back later for the full article.Narrowly understood, social choice theory is a specialized branch of applied logic and mathematics that analyzes abstract objects called preference aggregation functions, social welfare functions, and social choice functions. But more broadly, social choice theory identifies, analyzes, and evaluates rules that may be used to make collective decisions. So understood, social choice is a subfield of the social sciences that examines what may be called “voting rules” of various sorts. While social choice theory typically assumes a finite set of alternatives over which voter preferences are unrestricted, the spatial model of social choice assumes that policy alternatives can be represented by points in a space of one or more dimensions, and that voters have preferences that are plausibly shaped by this spatial structure.Social choice theory has considerable relevance for the study of legislative (as well as electoral) institutions. The concepts and tools of social choice theory make possible formal descriptions of legislative institutions such as bicameralism, parliamentary voting procedures, effects of decision rules (e.g., supramajority vs. simple majority rule and executive veto rules), sincere vs. strategic voting by legislators, agenda control, and other parliamentary maneuvers. Spatial models of social choice further enrich this analysis and raise additional questions regarding policy stability and change. Spatial models are used increasingly to guide empirical research on legislative institutions and processes.
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Book chapters on the topic "Spatial stability analysis"

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Donaghy, Kieran P. "Generalized Stability Analysis of a Non-Linear Dynamic Model." In Advances in Spatial Science, 243–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-59787-9_12.

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Dabaghian, Yuri. "Topological Stability of the Hippocampal Spatial Map and Synaptic Transience." In Topological Dynamics and Topological Data Analysis, 239–53. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0174-3_20.

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Shuai, Zhikang. "Spatial-Scale Model Reduction of Multi-Microgrid Based on Dynamic Equivalent Theory." In Transient Characteristics, Modelling and Stability Analysis of Microgird, 161–84. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8403-9_7.

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Cudjoe, F., and K. Esmaeili. "A stochastic spatial modeling approach for pit slope stability analysis using 3D limit equilibrium analysis." In The Evolution of Geotech - 25 Years of Innovation, 544–50. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003188339-68.

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Chakraborty, Rubi, and Arindam Dey. "A Comparison of 1D and 2D Spatial Variability in Probabilistic Slope Stability Analysis." In Lecture Notes in Civil Engineering, 541–53. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6701-4_34.

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Nichols, Ian, John S. Gierke, Thomas Oommen, and Maria Diletta Acciaro. "Significance of the Spatial Resolution of DEM in Regional Slope Stability Analysis Enguri Dam, Republic of Georgia." In Building Knowledge for Geohazard Assessment and Management in the Caucasus and other Orogenic Regions, 281–300. Dordrecht: Springer Netherlands, 2021. http://dx.doi.org/10.1007/978-94-024-2046-3_15.

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Zhang, Wengang, Fansheng Meng, Jianxin Li, and Changjie He. "Seismic Stability Analysis of High Steep Slopes Considering Spatial Variability of Geo-Materials Based on Pseudo Static Method." In Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 2022), 1413–21. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11898-2_123.

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Feitosa, Flávia, Joana Barros, Eduardo Marques, and Mariana Giannotti. "Measuring Changes in Residential Segregation in São Paulo in the 2000s." In The Urban Book Series, 507–23. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64569-4_26.

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AbstractResidential segregation is known as one of the most prevalent problems of Latin American and Brazilian cities. This chapter looks into the changes in segregation levels in the Metropolitan Region of São Paulo between 2000 and 2010. This period was marked by economic growth and decreasing social inequalities in Brazil with consequent improvement to the quality of life of lower income classes. Despite those improvements, general patterns of urban segregation in Brazilian cities showed remarkable stability, albeit with important changes in the details of segregation patterns. This chapter explores the spatial relationship between socio-occupational groups using global and local segregation indices. The analysis confirmed a highly segregated distribution of social groups in the Metropolitan Region and revealed increased levels of segregation, with global indices figures for 2010 higher than for 2000. Analysis demonstrated that peripheral areas of the Metropolitan Region became more fragmented and heterogeneous in that period, and revealed that their increased heterogeneity is mainly composed of classes with close social proximity, rather than polarised ones. Results showed that while middle classes became more integrated amongst themselves and with lower classes, the separation between lower and upper classes was not only maintained but also increased during the period. All these findings suggest a reconfiguration of the concentric pattern of segregation that maintained a spatial structure of strong social isolation during the period, although with greater complexity.
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Herbert, Thorwald, Fabio P. Bertolotti, and German R. Santos. "Floquet Analysis of Secondary Instability in Shear Flows." In Stability of Time Dependent and Spatially Varying Flows, 43–57. New York, NY: Springer New York, 1987. http://dx.doi.org/10.1007/978-1-4612-4724-1_3.

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Chakraborty, S., E. T. Kolkovska, and J. A. López-Mimbela. "Stability of a Nonlinear Equation Related to a Spatially-inhomogeneous Branching Process." In Stochastic Analysis with Financial Applications, 21–32. Basel: Springer Basel, 2011. http://dx.doi.org/10.1007/978-3-0348-0097-6_2.

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Conference papers on the topic "Spatial stability analysis"

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Wei, Yingchun, Daiyong Cao, and Juemei Deng. "A new practical methodology of the coal bed stability evaluation: the trend and variation method." In International Symposium on Spatial Analysis, Spatial-temporal Data Modeling, and Data Mining, edited by Yaolin Liu and Xinming Tang. SPIE, 2009. http://dx.doi.org/10.1117/12.837308.

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González, Eduardo, and Marcelo J. Villena. "Stability analysis for spatial attrition with n forces." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2012: International Conference of Numerical Analysis and Applied Mathematics. AIP, 2012. http://dx.doi.org/10.1063/1.4756415.

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Gudmundsson, Kristjan, and Tim Colonius. "Spatial Stability Analysis of Chevron Jet Profiles." In 13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-3599.

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Wang, Yi, Qunsheng Cao, and Bingbo Su. "Spatial stability analysis for the geodesic FDTD algorithm." In 2011 IEEE International RF and Microwave Conference (RFM). IEEE, 2011. http://dx.doi.org/10.1109/rfm.2011.6168725.

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Yaqin, Chen, and Wang Fei. "Spatial Stability Analysis of Single Tower Cable-Stayed Bridge." In 2018 International Conference on Engineering Simulation and Intelligent Control (ESAIC). IEEE, 2018. http://dx.doi.org/10.1109/esaic.2018.00075.

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Eglite, Irina, and Andrei A. Kolyshkin. "Spatial Stability Analysis of Shallow Mixing Layers with Variable Friction Coefficient." In Modelling, Identification and Control. Calgary,AB,Canada: ACTAPRESS, 2014. http://dx.doi.org/10.2316/p.2014.809-036.

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Wiegmann, Axel, Clemens Elster, Ralf D. Geckeler, and Michael Schulz. "Stability analysis for the TMS method: Influence of high spatial frequencies." In Optical Metrology, edited by Wolfgang Osten, Christophe Gorecki, and Erik L. Novak. SPIE, 2007. http://dx.doi.org/10.1117/12.726116.

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Salemi, Leonardo, and Marcio Mendonca. "Spatial and Temporal Linear Stability Analysis of Binary Compressible Shear Layer." In 38th Fluid Dynamics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-3841.

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Chakraborty, Abhishek, Suneet Singh, and M. P. S. Fernando. "LINEAR STABILITY ANALYSIS OF SPATIAL XENON OSCILLATIONS INCLUDING THERMAL HYDRAULIC FEEDBACKS." In Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017). Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/ihmtc-2017.730.

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Kasama, K., and K. Zen. "Effects of Spatial Variability of Soil Property on Slope Stability." In First International Symposium on Uncertainty Modeling and Analysis and Management (ICVRAM 2011); and Fifth International Symposium on Uncertainty Modeling and Anaylsis (ISUMA). Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41170(400)84.

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Reports on the topic "Spatial stability analysis"

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Fardad, Makan, and Bassam Bamieh. Perturbation Methods in Stability and Norm Analysis of Spatially Periodic Systems. Fort Belvoir, VA: Defense Technical Information Center, January 2006. http://dx.doi.org/10.21236/ada458858.

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Jung, Paul H., Jean-Claude Thill, and Luis Armando Galvis-Aponte. State Failure, Violence, and Trade: Dangerous Trade Routes in Colombia. Banco de la República, December 2021. http://dx.doi.org/10.32468/dtseru.303.

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We investigate the effect of domestic armed violence brought about by political instability on the geography of distance frictions in freight mobility and the resulting differential access of regions to global markets. The Colombian transportation system has been found to be impeded by deficiencies in landside transport infrastructure and institutions, and by fragmented political environments. The micro-level analysis of U.S.-bounded export shipping records corroborates that export freight shipping from inland regions is re-routed to avoid exposures to domestic armed violence despite greatly extended landside and maritime shipping distances. We exploit the trajectories of freight shipping from Colombian regions and spatial patterns of violent armed conflicts to see how unstable geopolitical environments are detrimental to freight shipping mobility and market openness. The discrete choice model shows that the shipping flow is greatly curbed by the extended re-routing due to domestic armed violence and that inland regions have restricted access to the global market. The perception of risk and re-routing behavior is found heterogeneous across shipments and conditional to shipment characteristics, such as commodity type, freight value and shipper sizes. The results highlight that political stability must be accommodated for improved freight mobility and export-oriented economic development in the global South.
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Giles Álvarez, Laura, Juan Carlos Vargas-Moreno, Alejandra Mejía, Aastha Patel, and Nerlyne Jean-Baptiste. Une approche spatiale pour analyser l’insécurité alimentaire dans le département du Nord-Ouest d’Haïti. Inter-American Development Bank, December 2022. http://dx.doi.org/10.18235/0004589.

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Cette étude présente une analyse de l’insécurité alimentaire et de ses facteurs sous-jacents dans le département du Nord-Ouest en Haïti. Ce département est l’un des plus vulnérable et le plus touché par l’insécurité alimentaire en Haïti, avec 55 % de la population ayant besoin d’une assistance urgente (IPC 2022). L’aide du Cadre intégré des phases de la sécurité alimentaire (IPC) et du Cadre de sécurité alimentaire (BID 2018) de la Banque Interaméricaine de développement (BID), cet article présente une analyse géo-spatiale, complétée par un examen d’autres facteurs socioéconomiques, pour donner un aperçu de ce qui aggrave cette crise alimentaire et des domaines les plus urgents à traiter. Les résultats montrent que le déclin de la production nationale - qui a été entravée par des infrastructures et des financements inadéquats, l’insécurité et les catastrophes naturelles - s’est produit parallèlement aux perturbations de la chane d’approvisionnement internationale, affectant les importations conjointement avec les recettes provenant de laide. L’ensemble de ces facteurs a un effet négatif sur la disponibilité de la nourriture. Les contraintes d’approvisionnement, les restrictions de mobilité, les chocs de prix et les risques pour les revenus durables ont également un impact négatif sur l’accès à la nourriture. Les difficultés d’accès à l’eau potable et aux infrastructures sanitaires, ainsi que le manque de diversité au niveau des régimes alimentaires, entravent également l’utilisation de la nourriture, décrite comme la disponibilité d’aliments de qualité nécessaires pour atteindre un statut nutritionnel adéquat. En outre, la stabilité alimentaire n’est pas garantie en raison des problèmes liés aux dotations naturelles de la région, au manque ou à la faible capacité des infrastructures d’irrigation, à la vulnérabilité aux chocs climatiques, aux fluctuations des prix et à l’insécurité. Sur la base de ces résultats, ce document recommande 23 actions visant à augmenter l’accès aux services de base, à promouvoir une nutrition adéquate, à soutenir une agriculture productive et durable et à accroître la résilience aux chocs et aux fluctuations inhérentes à l’écosystème alimentaire. Plus important encore, le déploiement efficace de ces mesures nécessitera une approche coordonnée à tous les niveaux administratifs de ltatocal et national, en collaboration avec le secteur privé et la communauté des donateurs.
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Financial Stability Report - Second Semester of 2021. Banco de la República, September 2022. http://dx.doi.org/10.32468/rept-estab-fin.sem2.eng-2021.

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Banco de la República’s main objective is to preserve the purchasing power of the currency in coordination with the general economic policy that is intended to stabilize output and employment at long-term sustainable levels. Properly meeting the goal assigned to the Bank by the 1991 Constitution critically depends on preserving financial stability. This is understood to be a general condition in which the financial system assesses and manages the financial risks in a way that facilitates the economy’s performance and efficient allocation of resources while, at the same time, it is able to, on its own, absorb, dissipate, and mitigate the shocks that may arise as a result of adverse events. This Financial Stability Report meets the goal of giving Banco de la República’s diagnosis of the financial system’s and its debtors’ recent performance as well as of the main risks and vulnerabilities that could affect the stability of the Colombian economy. In this way, participants in financial markets and the public are being informed, and public debate on trends and risks affecting the system is being encouraged. The results presented here also serve the monetary authority as a basis for making decisions that will enhance financial stability in the general context of its objectives. In recent months, several positive aspects of the financial system have preserved a remarkable degree of continuity and stability: the liquidity and capital adequacy of financial institutions have remained well above the regulatory minimums at both the individual and consolidated levels, the coverage of past-due loans by loan-loss provisions remains high, and the financial markets for public and private debt and stocks have continued to function normally. At the same time, a surge in all the types of loan portfolios, a sharp downturn in the non-performing loan portfolio, and a rise in the profitability of credit institutions can be seen for the first time since the beginning of the pandemic. In line with the general recovery of the economy, the main vulnerability to the stability of the Colombian financial system identified in the previous edition—uncertainty about changes in the non-performing loans portfolio—has receded and remains on a downward trend. In this edition, the main source of vulnerability identified for financial stability in the short term is the system’s exposure to sudden changes in international financial conditions; the results presented in this Report indicate that the system is sufficiently resilient to such scenarios. In compliance with its constitutional objectives and in coordination with the financial system’s security network, Banco de la República will continue to closely monitor the outlook for financial stability at this juncture and will make the decisions necessary to ensure the proper functioning of the economy, facilitate the flow of sufficient credit and liquidity resources, and further the smooth functioning of the payment system. Leonardo Villar Gomez Governor Box 1 -Decomposition of the Net Interest Margin in Colombia and Chile Wilmar Cabrera Daniela Rodríguez-Novoa Box 2 - Spatial Analysis of New Home Prices in Bogota, Medellín, and Cali Using a Geostatistical Approach María Fernanda Meneses Camilo Eduardo Sánchez Box 3 - Interest Rate Model for the SYSMO Stress Test Exercise Wilmar Cabrera Diego Cuesta Santiago Gamba Camilo Gómez Box 4 - The Transition from LIBOR and other International Benchmark Rates Daniela X. Gualtero Briceño Javier E. Pirateque Niño
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