Relevant bibliographies by topics / Stability analysi

Academic literature on the topic 'Stability analysi'

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Published: 14 March 2023

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Journal articles on the topic "Stability analysi"

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Pushparaj, T. Lurthu, and V. Alexander. "High rigid Gd (DO3VA) shows remarkable relaxivity: A novel class of MMI agent engineered for MR analysi." Applied Chemical Engineering 5, no. 1 (April 26, 2022): 51. http://dx.doi.org/10.24294/ace.v5i1.447.

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A novel dinuclear gadolinium(III) complex of an amide linked bispolyazatricarboxylate macrocycle (DO3VA) having 2-bromoisovaleric acid pendant arm is reported. The molecular longitudinal relaxivity of the dinuclear complex [Gd2{acamidoet(DO3VA)2}(H2O)2] is 13.23mM–1s–1 which corresponds to a “per Gd” relaxivity of 6.62 mM–1 s–1 (20 MHz, 37 ± 0.1 °C, pH 7). The “per Gd” r1p value is higher than the relaxivity of the clinically approved CAs. The transverse relaxivity (r2p) of [Gd2{acamidoet(DO3VA)2}(H2O)2] is 14.34 mM–1 s–1. The r2p/r1p values of 1.08 indicate that the complex is T1-weighted CAs. The 2-bromoisovaleric acid seems to be an excellent pendant arm for holding Gd(III) metal ion at any pH. The remarkable stability of the complex at various pH and in presence of protein shows that the ligand can be used as functionality in making new CAs for MRI and the amide core is a versatile core molecule for the creation of polynuclear gadolinium(III) chelates and dendrimeric CAs.
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Shehata, Adel B., Abdulrahman R. Alaskar, Mohammed A. Alrasheed, Abdullah S. Alosaimi, Fahd A. Alkharraa, and Abdulrahman M. Alzahrani. "Certification of sodium benzoate solution reference material by HPLC-UV, LC-MS/MS and UV-VIS-NIR spectrophotometry for food and drug analysi." Journal of Chemical Metrology 14, no. 2 (November 28, 2020): 88–105. http://dx.doi.org/10.25135/jcm.48.20.08.1780.

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Sodium benzoate is one of the most widely used food perseverates and has to be used in regulated amounts to avoid its harmful health effects. Reviewing the scientific literature for traceability of the analytical measurement results of sodium benzoate in various food and drug applications to the SI units, it has been found that no scientific details of certification of sodium benzoate CRMs used for the calibration of measuring equipment are published. For this reason, the national metrology institute of Saudi Arabia (SASO/NMCC) certifies a sodium benzoate solution reference material. In this work, sodium benzoate was synthesized, purified and a batch solution reference material was prepared as 1014.47 mg/kg then homogenized and bottled. Homogeneity and stability of the candidate RM were assessed and the results obtained showed that the material is sufficiently homogeneous and stable. Characterization of the reference material was carried out by HPLC-UV, LC-MS/MS and UV-VIS-NIR spectrophotometer as three independent methods. The certified value was derived by combining data from the three methods using the weighted mean approach and was found 1016.13 mg/kg. The certified uncertainty was calculated as weighted uncertainty and was found 10.47 mg/kg (1.03%). Sources of this uncertainty were identified from the characterization, uchar, homogeneity, uhom, and long-term stability, ults, as well as the bias allowance, B.
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Pacheco-Martínez, Nancy Jacqueline, Carlos Juárez-Toledo, and Irma Martínez-Carrillo. "Análisis dinámico de la estabilidad usando interpolación de alto orden." Ingeniería, investigación y tecnología 13, no. 4 (October 1, 2012): 451–60. http://dx.doi.org/10.22201/fi.25940732e.2012.13n4.044.

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T, Bayisa. "Stability Analysis of Bread Wheat Genotypes Using the AMMI Stability Model at Southeast Oromia." Food Science & Nutrition Technology 7, no. 1 (2022): 1–6. http://dx.doi.org/10.23880/fsnt-16000277.

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Ethiopia is the largest wheat producer in Sub- Saharan Africa. The productivity of wheat has increased in the last few years in the country, but low as compared to other countries. This low productivity is attributed to a number of factors including biotic, abiotic, shortage of high yielding and stable varieties. The objective of the present study is to identify high yielding and stable genotype. A total of twenty genotypes including Dambal (st. check) and Mada walabu (Local check) were evaluated for two cropping season 2017 and 2018 at four locations: Sinana, Agarfa, Goba and Gololcha. The experiment was laid out in RCBD with three replications. The result of combined analysis of variance showed high significant differences for genotypes, environment and GE interaction. The result of AMMI analysis indicated that 36.3 %, of the total variability was justified by environment, 28.6% by genotypes and 34.9% by GE interaction whereas IPCA 1 and IPCA 2 explained 74.2% from the total GE. Based on GSI a single criteria for stability and high grain yield, genotypes G9, G1, G14,G10, G15 and G12 have the smallest genotype stability index which means they were stable and high yielding genotype. The best genotype with respect to environment Gololcha 2017 and Gololcha 2018 was genotype G10. Genotypes G3 and G17 were better adapted to environments Agarfa 2017. G12 is high yielder stable across tested locations. Therefore this genotype was identified as candidate genotypes to be verified for possible release.
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Jánský, Jiří, and Petr Kundrát. "The stability analysis of a discretized pantograph equation." Mathematica Bohemica 136, no. 4 (2011): 385–94. http://dx.doi.org/10.21136/mb.2011.141698.

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Ebrahimi, Behnam, Kayvan Sadeghy, and Mohammad-Ali Akhavan Bahabadi. "Viscous Fingering of Thixotropic Fluids: a Linear Stability Analysis." Nihon Reoroji Gakkaishi 43, no. 2 (2015): 31–38. http://dx.doi.org/10.1678/rheology.43.31.

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Moreno, Gonzalo, Juan Carlos Serrano, and Simón Figueroa-Salgado. "Análisis bidimensional de la estabilidad de vehículos pesados tipo carro-tanque." Revista UIS Ingenierías 19, no. 3 (March 27, 2020): 31–36. http://dx.doi.org/10.18273/revuin.v19n3-2020003.

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En el presente trabajo se realiza elanálisis de la estabilidad de vehículos pesados tipo carro-tanque. Para dicho propósito se utiliza el factor denominado umbral de vuelco estático (Static Rollover Threshold, por las siglas eninglés SRT), el cual permite evaluar la máxima fuerza inercial aplicada lateralmente que puede soportar el vehículo antes de iniciar el proceso de vuelco. Adicionalmente, este factor permite determinar la máxima velocidad que el vehículo puede desarrollar al recorrer una curva, dando de esta manera mayor seguridad para los usuarios de la vía. Teniendo en cuenta estos aspectos, se estudia la estabilidad de un carro-tanque de sección transversal circular, ya que para vehículos que transportan líquidos la estabilidad es más crítica, debido a que se debe tener en cuenta el movimiento del fluido transportado cuando es sometido a una aceleración lateral, lo cual puede disminuir el factor de estabilidad. Por consiguiente, para determinar el factor de estabilidad se realiza un análisis detallado del movimiento del fluido como función de la aceleración y el llenado del tanque y se utiliza el método de Davies para el análisis cuasi-estático de la estabilidad del vehículo.
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Shirvani, Mojtaba, Ahmad Memaripour, Meysam Eghtedari, and Hasan Fayazi. "Small signal stability analysis of power system following different outages." International Journal of Academic Research 6, no. 2 (March 30, 2014): 268–72. http://dx.doi.org/10.7813/2075-4124.2014/6-2/a.38.

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Fukuda, Emiko, and Shigeo Muto. "DYNAMIC ANALYSIS OF STABILITY OF COALITION GOVERNMENTS IN JAPAN 1993." Journal of the Operations Research Society of Japan 53, no. 1 (2010): 69–78. http://dx.doi.org/10.15807/jorsj.53.69.

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Naruse, Keitaro, and Keigo Suenaga. "Stability Analysis of Multiple Mobile Robots by Swarm Leading Control." Abstracts of the international conference on advanced mechatronics : toward evolutionary fusion of IT and mechatronics : ICAM 2010.5 (2010): 1–6. http://dx.doi.org/10.1299/jsmeicam.2010.5.1.

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Dissertations / Theses on the topic "Stability analysi"

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Besse, Apollos. "Modélisation mathématique de la leucémie myéloide chronique." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1105/document.

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Cette thèse porte sur la dynamique de modèles de leucémie myéloïde chronique (LMC). Les modèles qui nous intéressent décrivent les populations de cellules leucémiques dans la moelle osseuse ou le sang, en compétition avec des populations de cellules saines ou avec le système immunitaire. Dans un premier chapitre, nous proposons une version mathématiquement analysable d'un modèle à équations différentielles ordinaires qui décrit l'interaction du système immunitaire avec les cellules leucémiques. Nous caractérisons l'existence d'équilibres et leur stabilité puis nous fournissons une analyse de bifurcation complète en co-dimension 1. Dans un deuxième chapitre, nous confrontons ce modèle à des données cliniques. Dans un troisième chapitre, nous proposons et analysons une version simplifiée d'un modèle d'équations aux dérivées partielles qui décrit la prolifération et la différenciation des cellules souches leucémiques dans la moelle osseuse et l'effet d'un traitement par ITK sur ces cellules. Nous nous intéressons au comportement à long terme des solutions, et à sa dépendance vis à vis du traitement. Dans un quatrième et dernier chapitre, nous nous intéressons à la stabilité des équations différentielles scalaires et autonomes à deux retards, qui apparaissent naturellement dans la modélisation de nombreux phénomènes biologiques ou physiques, comme la LMC
This thesis deals with the dynamics of models of chronic myeloid leukemia (CML). Models of interest describe leukemic cell populations in the bone marrow or in the blood, in competition with healthy cell populations or with the immune system. In a first chapter, we propose a mathematically tractable version of an ordinary differential equation model that describes the interaction of the immune system with leukemic cells. We characterize the existence of steady states and their stability and then we provide a complete bifurcation analysis in co-dimension 1. In a second chapter, we confront this model with clinical data. In a third chapter we propose and analyze a simplified version of a model of partial differential equations that describes the proliferation and differentiation of leukemic stem cells in the bone marrow and the effect of an TKI treatment on these cells. We are interested in the long-term behavior of the solutions, and its dependence on treatment. In a fourth and final chapter, we are interested in the stability of scalar and autonomous differential equations with two delays, which appear naturally in the modeling of many biological or physical phenomena, such as CML
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Jin, Chi. "Analyse de stabilité de systèmes à coefficients dépendant du retard." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS411/document.

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Des systèmes avec des coefficients dépendant du retard ont été rencontrés dans diverses applications de la science et de l'ingénierie. Malgré la littérature abondante sur les systèmes de temporisation, il y a peu de résultats concernant l'analyse de stabilité des systèmes avec des coefficients dépendant du retard. Cette thèse est consacrée à l'analyse de stabilité de cette classe de systèmes.Les méthodes d'analyse de la stabilité sont développées à partir de l'équation caractéristique correspondante suivant une approche généralisée tau-décomposition. Étant donné un intervalle d'intérêt de retard, nous sommes capables d'identifier toutes les valeurs de retard critique contenues dans cet intervalle pour lesquelles l'équation caractéristique admet des racines sur l'axe imaginaire du plan complexe. Le critère de direction de croisement des racines sont proposées pour déterminer si ces racines caractéristique se déplacent vers le plan complexe demi-gauche ou demi-droite lorsque le paramètre de retard passe par ces valeurs de retard critique. Le nombre de racines caractéristiques instables pour un retard donné peut ainsi être déterminé. Notre analyse comprend les systèmes avec un seul retard ou des retards proportionnés sous certaines hypothèses. Le critère de direction de croisement des racines développés dans cette thèse peut être appliqués aux multiple racines caractéristiques, ou aux racines caractéristiques dont la position paramétrée par le retard est tangent à l'axe imaginaire. En tant qu'application, il est démontré que les systèmes avec des coefficients dépendant du retard peuvent provenir de schémas de contrôle qui utilisent une sortie retardée pour approcher ses dérivés pour la stabilisation. Les méthodes d'analyse de stabilité développées dans cette thèse sont adaptées et appliquées pour trouver les intervalles de retard qui atteignent un taux de convergence demandé du système en boucle fermée
Systems with delay-dependent coefficients have been encountered in various applications of science and engineering. However, general and systematic stability analysis is rarely reported in the rich literature on time-delay systems. This thesis is committed to the stability analysis of such class of systems.Stability analysis methods are developed based on the corresponding characteristic equation following a generalized tau-decomposition approach. Given a delay interval of interest, we are able to identify all the critical delay values contained in this interval for which the characteristic equation admits roots on the imaginary axis of the complex plane. Various root crossing direction criteria are proposed to determine whether these characteristic roots move toward the left or the right half complex plane as the delay parameter sweeps through these critical delay values. The number of unstable characteristic roots for any given delay can thus be determined. Our analysis covers systems with a single delay or commensurate delays under certain assumptions. The root crossing direction criteria developed in this thesis can be applied to characteristic roots with multiplicity, or characteristic roots whose locus parametrized by the delay is tangent to the imaginary axis. As an application, it is demonstrated that systems with delay-dependent coefficients can arise from control schemes that use delayed output to approximate its derivatives for stabilization. The stability analysis methods developed in this thesis are tailored and applied to find the delay intervals that achieve a demanded convergence rate of the closed-loop system
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Maatar, Dhouha. "Analyse des signaux stabilométriques et de la stabilité chez l’Homme : application à la biométrie." Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST1161/document.

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La biométrie se réfère à la reconnaissance automatique des individus. Elle est basée sur leurs caractéristiques physiologiques et/ou comportementales. Le contrôle postural, bien que soit une caractéristique comportementale de l'Homme, n'a pas été bien développée dans le domaine de la biométrie. Le travail mené dans cette thèse repose sur l'analyse des signaux stabilométriques et l'application à la biométrie. Dans un premier volet, une étude de l'information posturale, en particulier le signal stabilométrique, est effectuée à travers des méthodes d'analyses classiques à savoir et l'analyse spatio-temporelle, spectrale et stochastique et à travers aussi deux méthodes de décomposition : la décomposition appelée analyse en composantes principales (ACP) et la décomposition en ondelettes. La méthode ACP, basée sur le modèle additif, permet de décomposer le signal en trois composantes: un signal de tendance, un signal d'excursion et un signal de tremblements. La méthode de décomposition en ondelettes permet de décomposer le signal en trois niveaux de signaux de détail et trois niveaux de signaux d'approximation. Suite à l'étude de la stabilité posturale, l'analyse spectrale et l'analyse de la phase des différentes composantes issues de la ACP et de la décomposition en ondelettes, la comparaison de ces deux méthodes conclut que la méthode ACP est plus appropriée que la décomposition en ondelettes pour analyser le stabilogramme. A partir des méthodes de décomposition et des méthodes d'analyses classiques, des paramètres sont extraits afin d'étudier l'effet de différents facteurs sur la stabilité posturale et sur le déplacement du centre de masse. Ces facteurs sont la vision, la direction, la proprioception, l'âge, le genre, la taille et le poids. Un deuxième volet de ce travail est consacré à l'application biométrique, à partir des paramètres extraits et suite à une analyse statistique ANOVA, ceux qui sont les plus discriminatifs sont utilisés pour identifier des sujets et les classer selon leur âge, genre, poids et taille. Cette application biométrique est effectuée par trois méthodes de classification à savoir, K-ppv, ADL et SVM. Les applications biométriques aboutissent à des taux de reconnaissance respectables dépassant 80%. De ce fait, il est à déduire que l'analyse du contrôle postural est prometteuse dans le domaine de la biométrie
Biometrics refers to automatic recognition of individuals. It is based on their physiological and / or behavioral. The postural control, despite that is a human behavioral characteristic, has not been well developed in the field of biometrics. The work performed in this thesis is based on the stabilometric signals analysis ant biometric application. Firstly, a study of the postural information especially the stabilometric signal is carried out through traditional analysis namely temporal, frequency and stochastic analysis and two decomposition methods named principle components analysis (ACP) decomposition and wavelet decomposition. The ACP method, based on the additive model, allows decomposing the signal into three components: a trend signal, a rambling signal and a trembling signal. The wavelet decomposition method allows decomposing the signal into three levels of detail signals and three signal levels of approximation. Through the study of postural stability, spectral analysis and phase analysis of the different components from the ACP and the wavelet decomposition, the comparison of these two methods concludes that the ACP method is more appropriate than the wavelet decomposition to analyze the stabilogram. From the decomposition methods and classical methods of analysis, several parameters are extracted to study the effect of different factors on postural stability and the center of mass displacement. These factors are named vision, direction, proprioception, age, gender, height and weight. A second aspect of this work is devoted to the application of biometrics, from the extracted parameters and through ANOVA statistic analysis, those that are most discriminative are used to identify subjects and classify them according to age, gender, weight and size. This biometric application is performed by three classification methods namely, K-NN, LDA and SVM. Biometric applications result in respectable recognition rate exceeding 80%. Therefore, it is inferred that the analysis of postural control is promising in the field of biometrics
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Cherifi, Abdelmadjid. "Contribution à la commande des modèles Takagi-Sugeno : approche non-quadratique et synthèse D -stable." Thesis, Reims, 2017. http://www.theses.fr/2017REIMS016/document.

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Ce travail de thèse traite de l’analyse de la stabilité et la stabilisation des systèmes non-linéaires représentés par des modèles T-S. L’objectif est de réduire le conservatisme des conditions de stabilité, obtenue par la méthode directe de Lyapunov, et écrites, dans la mesure du possible, sous forme de LMIs. Dans ce cadre, deux contributions principales ont été apportées. Tout d’abord, nous avons proposé de nouvelles conditions de synthèse non-quadratique de lois de commande, strictement LMIs et sans restriction d’ordre, pour les modèles T-S via des FLICs. En effet, dans ce contexte, les résultats de la littérature ne sont valables que pour les modèles T-S d’ordre inférieur ou égal à 2. Afin de lever cette restriction, les conditions ont été obtenues grâce à la démonstration d’une propriété de dualité. Ensuite, peu de travaux traitant de la spécification des performances en boucle fermée, de nouvelles conditions LMIs (quadratiques et non-quadratiques) ont été proposées via le concept de D-stabilité. Dans un premier temps, la synthèse de lois de commande PDC et non-PDC D-stabilisantes a été proposée pour les modèles T-S nominaux. Ensuite, ces résultats ont été étendus au cas des modèles T-S incertains. De plus, nous avons mis en évidence, au travers d’un exemple de D-stabilisation en attitude d’un modèle de drone quadrirotor, que les modèles T-S incertains pouvaient être avantageusement considérés lorsque les non-linéarités d’un modèle non-linéaire dépendent à la fois de l’état et de l’entrée
This work deals with the stability analysis and the stabilisation of nonlinear systems represented by T-S models.The goal is to reduce the conservatism of the stability conditions, obtained through the direct Lyapunov methodand written, when it is possible, as LMIs. In this framework, two main contributions has been proposed. First ofall, we have proposed some new conditions based on FLICs, strictly LMIs and without any order restrictions, forthe non-quadratic design of control laws devoted to stabilize T-S models. Indeed, in this non-quadratic context,the existing works are only available for 2nd order T-S models. In order to unlock this restriction, the proposed conditions have been obtained based on the proof of a dual property. Then, starting from the fact that few worksdeals with the closed-loop performances specification, some new LMI conditions (quadratic and non-quadratic)have been proposed via the D-stability concept. As a first step, D-stabilizing PDC and non-PDC controller designhas been considered for nominal T-S models. Then, these results have been extended to uncertain T-S models.Moreover, it has been highlighted, from an example of the attitude D-stabilization of a quadrotor model, that wecan make use of uncertain T-S models to cope with nonlinear models involving nonlinearities depending on bothstate and input variables
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Cosson, Marjorie. "Stabilité du réseau électrique de distribution. Analyse du point de vue automatique d'un système complexe." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC065/document.

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Pour maintenir la tension dans des bornes admissibles, des régulations locales de puissance réactive (Q) en fonction de la tension (U) sont envisagées sur les réseaux de distribution. Ces travaux étudient l’impact de ces régulations sur la stabilité des réseaux de distribution accueillant de la production. Une étude empirique confirme le risque d’instabilité de la tension et souligne le lien avec les paramètres de la régulation. Pour aider les gestionnaires à les choisir, trois méthodes d’étude de la stabilité sont proposées. Tout d’abord, une méthode formelle fondée sur les notions d’abstraction discrète et de bisimulation est développée. Elle offre une grande précision au prix d’un effort de calcul important. Pour contournercette difficulté, un critère analytique portant sur le temps de réponse des régulations Q(U) est formulé. Ensuite, un critère valable dans tous les cas est proposé pour les codes de réseaux. Enfin, l’extension desméthodes à des cas plus complexes est discutée
To maintain the voltage within specified limits, local control laws of distributed generators (DGs) reactive power (Q) with respect to their voltage (U) have been considered. This work studies the impact of Q(U) control laws on distribution feeders’voltage stability. An empirical study confirms the risk of voltage instability and highlights its dependence on control law parameters. To help distribution grid operators to choose these parameters, three methods assessing stability are formulated.First, a formal method based on discrete abstraction and bisimulation calculation is developed. The proposed approach yields precise results but with a high computational load. Then, to overcome this issue, an analytical criterion adapting Q(U) control laws response time with respect to grid parameters is formulated. Finally, a general criterion, valid in any cases, is established in order to be included in the grid codes. To conclude this work, extension to more complex cases is discussed
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Heng, Yaguang. "Décrochage tournant dans un diffuseur lisse radial : Étude de stabilité et effet sur la performance." Thesis, Paris, ENSAM, 2017. http://www.theses.fr/2017ENAM0049/document.

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Résumé: Le comportement des turbomachines (pompes, compresseurs) fonctionnant à des conditions hors conception, et particulièrement aux débits partiels, est sujet à des phénomènes d'instabilité qui pourraient affecter leur performance et peuvent être dramatiques pour les machines ou leur environnement. Cette étude se concentre sur la décrochage tournant dans un diffuseur lisse radial. L'objectif est proposer un modèle théorique pour prédire rapidement les caractéristiques de décrochage tournant. Une étude expérimentale est effectuée en premier pour obtenir les caractéristiques de décrochage tournant dans un transparent diffuseur lisse d’une roué radiale. L'effet de décrochage tournant sur la performance du diffuseur est discuté basé sur les mesures de pression statique. Le résultat montre que décrochage tournant amélioré la récupération de la diffuseur pression, et les raisons sont proposes. Basé sur la configuration expérimentale, une analyse de stabilité linéaire qui est construit par l'équation de continuité, l'équation de la quantité de mouvement et les équations de vorticité, est propose. Les caractéristiques expérimentales de décrochage tournant: le nombre et la vitesse de propagation des cellules de décrochage tournant, sont calculés théoriquement. Le taux de croissance dans le modèle linéaire, est proposé pour déterminer la critique condition de décrochage tournant, et le dominant mode de décrochage tournant lorsque différents modes existent par intermittence. La théorique vitesse et pression fluctuations sont tracées pour décrire le débit du diffuseur à l'état de décrochage. Les capacités et les limites de la linéaire stabilité analyse sont conclues par la comparaison entre les résultats théoriques et expérimentaux. Ensuit, une non linéaire stabilité analyse est étendue pour considérer les non linéaires combinaisons qui sont négligées dans le modèle linéaire. L'objectif est donner des corrections (par termes non linéaires) aux résultats linéaires, les conclusions et les discussions sont faites à la fin
Abstract:The behavior of work-absorbing turbomachines (pumps, compressors) operating at off design conditions, and especially at partial flow rates, is subject to instability phenomena that could affect their performance and can be dramatic for the machines or their environment. This study is focused on the rotating stall in the vaneless diffuser, the objective is to propose a theoretical model to fast predict the characteristics of such an instability. An experimental study is performed first to obtain those characteristics of rotating stall in a transparent vaneless diffuser of a radial impeller. The effect of rotating stall on the diffuser performance is discussed based on the static pressure measurements. The result shows rotating stall improved the diffuser pressure recovery, and the reasons are proposed. Based on the experimental setup, a linear stability analysis which is constructed by the continuity equation, momentum equation and vorticity equations, is proposed. The experimental characteristics of rotating stall: number and propagation velocity of stall cells, are theoretical calculated. The growth rate in the linear model, is proposed to determine the critical stall condition, and the dominant stall mode when different stall modes exist intermittently. The theoretical velocity and pressure fluctuations are also plotted to show the diffuser flow at stall condition. The abilities and limits of the linear stability analysis are concluded through the comparisons between theoretical and experimental results. Based on the linear model, a nonlinear stability analysis is extended to consider the nonlinear combinations which are neglected in the linear model, the aim is to give corrections (from nonlinear terms) to the linear results of rotating stall, the conclusions and discussions are made at the end
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Špíšková, Marcela. "Návrh na zajištění finanční stability podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2007. http://www.nusl.cz/ntk/nusl-221541.

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Master`s thesis analyses financial situation of the firm FABORY – CZ and views its financial health. The task of this master`s thesis is to propose solutions leading to the ensuring of financial stability of the company.
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Smejkalová, Helena. "Návrh na zajištění finanční stability podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2007. http://www.nusl.cz/ntk/nusl-221565.

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The first part of master`s thesis deals with proposal for providing a financial stability of a company. Second part is an application of the analysis to a particular company and designs with result in recovery of problematic spheres and improvement which should improve financial circumstances of the company
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Dal, Ferro Nicola. "Investigating the effects of SOC on soil structure: three-dimensional visualisation and modelling." Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3423348.

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The quantification of soil structure is primordial to determine the effects of management practices on soil environment. Soil structure is influenced by soil organic carbon content (SOC), which is usually recognised as one of the main indicator of soil fertility as it improves structure stability. Complex interactions link the soil structure and SOC that acts as a binding agent promoting aggregation. Several studies focussed on SOC dynamics and the relationship with soil aggregate microporosity, which is usually considered as a surrogate of the soil matrix complexity, neglecting the soil macropores outside aggregates. Therefore, the measures made at aggregate scale form only a small part of the important and complex properties of soil. Accordingly, it is important to quantify the effects that SOC exerts both is soil aggregates and undisturbed cores. The general aim of this work is to study the effects of different fertilisations (organic, mineral and mixed) applied to continuous maize by means of a long-term experiment established in 1962 in north-eastern Italy, analysing both small aggregates (few mm) and undisturbed soil cores (5 cm diameter, 6 cm length) with innovative three-dimensional techniques. The thesis is structured in five chapters. The first one is a review of the soil structure-SOC interactions and innovative three-dimensional methods involved in soil structure quantification. The second chapter analyses the effects of SOC and its humic fraction on the mechanisms of aggregate breakdown and improves upon the knowledge of aggregate structural properties. The third chapter compares and combines mercury intrusion porosimetry (MIP) and X-ray computer assisted microtomography (micro-CT) for characterising the soil structure. The fourth chapter analyses the 3D soil structure of undisturbed soil cores and the effects of SOC. The final chapter presents the general conclusions of the work.
La quantificazione della struttura del suolo è di primaria importanza per determinare gli effetti di diverse pratiche colturali sul terreno. La struttura è influenzata dal contenuto di carbonio organico (SOC), il quale è ampiamente identificato come il principale indicatore della fertilità del suolo, anche grazie alle sua attitudine di migliorarne la struttura fisica. Le interazioni che legano la struttura al SOC sono complesse e principalmente legate alla capacità di agire come agente aggregante tra le particelle che compongono la matrice del suolo. Molti studi si sono concentrati sulle dinamiche che legano il SOC e la microporosità degli aggregati (che è riconosciuta come un surrogato della complessa struttura del suolo) trascurando, in questo modo, la macroporosità, la quale non è individuabile in campioni di piccole dimensioni. Le misure fatte a scala di aggregato, perciò, ricoprono solo una parte delle importanti e complesse proprietà di un suolo. Di conseguenza è importante valutare l’effetto che esercita il SOC sia in piccoli aggregati che in campioni indisturbati. L’obiettivo generale di questo lavoro è valutare gli effetti di diversi regimi di fertilizzazione (organica, minerale e mista) in una prova di lungo periodo, iniziata nel 1962, gestita secondo una monosuccessione di mais. Sono stati analizzati sia aggregati di piccole dimensioni (pochi mm), che campioni indisturbati (5 cm di diametro, 6 cm di altezza), con innovative tecniche tridimensionali. La tesi è strutturata in cinque capitoli: il primo è una review sulle interazioni struttura del suolo-SOC e sulle tecniche tridimensionali utilizzate per la quantificazione della struttura. Il secondo capitolo analizza gli effetti del SOC e delle frazioni umiche sulla stabilità di struttura degli aggregati, individuando inoltre un nuovo meccanismo, legato alla diversa distribuzione della porosità, finora non considerato. Il terzo capitolo confronta e combina la porosimetria a intrusione di mercurio e la microtomografia a raggi X per la caratterizzazione della struttura. Il quarto capitolo analizza tridimensionalmente la struttura di campioni indisturbati e gli effetti del SOC sulla struttura stessa. Infine, l’ultimo capitolo riporta le conclusioni generali del lavoro.
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Xavier, Mathieu. "Étude analytique et numérique du développement de la striction multiple pour des cylindres métalliques en expansion dynamique." Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0064/document.

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La fragmentation d’enveloppes métalliques en expansion dynamique intéresse tant l’industrie civile que celle de la défense. Pour les deux domaines d’application, il s’agit de pouvoir prédire la taille et la vitesse des fragments, résultant de la destruction des enveloppes, afin de mesurer les conséquences que ceux-ci peuvent avoir sur des structures de sécurité. Les modèles de prédiction existants étudient le développement d’un défaut au sein du matériau et arrivent à déterminer une taille caractéristique des fragments. Néanmoins, ces modèles nécessitent une hypothèse dont la validité est remise en cause lorsque la vitesse de déformation est importante. Dans ce travail, nous proposons un nouveau modèle analytique pour des cylindres (sollicitation en traction plane) permettant de s’affranchir de cette hypothèse et d’étudier l’influence du défaut initial en suivant son évolution. Le modèle développé est comparé avec succès à des résultats issus de simulations numériques par éléments finis. Nos travaux permettent notamment de préciser les cadres d’application et de validité des approches classiques. Comme résultats majeurs, la nouvelle approche permet d’analyser les évolutions des perturbations aux faibles déformations mais aussi d’estimer le temps d’apparition des premières décharges élastiques, synonymes de strictions localisées
This work deals with the fragmentation of dynamically expanding metal shells and covers a problem of interest for both civil and military industries. For both fields of application, it is crucial to predict the size and the speed of fragments, resulting from the destruction of shells in order to measure the consequences that it could have on structures. Current models study the growth of a defect within the material and are able to determine a characteristic size of fragments. Nevertheless, these models require a hypothesis whose validity is questionable when the rate of deformation is important. In this work, we propose a new analytical model for cylinders (equivalent to the dynamic extension of a plate) to overcome this hypothesis and study the influence of the initial defect by following its time evolution. The model is compared successfully with results performed with a finite element method. Our work notably expands the framework of classical linear stability analyses. As a major outcome, the proposed approach is able to track the evolution of a perturbation even for small plastic strain, when the flow may be stable. In addition it is shown that the present approach can predict accurately the time where the elastic unloading is observed in finite element simulations
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Books on the topic "Stability analysi"

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O, Anderson Brian D., ed. Stability of adaptive systems: Passivity and averaging analysis. Cambridge, Mass: MIT Press, 1986.

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Antonio, Grimaldi, ed. Theory of stability of continuous elastic structures. Boca Raton: CRC, 1995.

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1960-, Ohsaki Makoto, ed. Optimization and anti-optimization of structures under uncertainty. London: Imperial College Press, 2010.

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Lind, Rick, and Marty Brenner. Robust Aeroservoelastic Stability Analysis. London: Springer London, 1999. http://dx.doi.org/10.1007/978-1-4471-0849-8.

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Giani, Gian Paolo. Rock slope stability analysis. Rotterdam: Balkema, 1992.

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Friauf, Walter S. Feedback loop stability analysis. New York: McGraw-Hill, 1998.

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Lakshmikantham, V. Stability analysis of nonlinear systems. New York: M. Dekker, 1989.

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Seydel, R. Practical bifurcation and stability analysis. 3rd ed. New York: Springer, 2010.

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Rajchakit, Grienggrai, Praveen Agarwal, and Sriraman Ramalingam. Stability Analysis of Neural Networks. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-6534-9.

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Seydel, Rüdiger. Practical Bifurcation and Stability Analysis. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-1740-9.

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Book chapters on the topic "Stability analysi"

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Menini, Laura, and Antonio Tornambè. "Stability Analysis." In Symmetries and Semi-invariants in the Analysis of Nonlinear Systems, 293–328. London: Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-612-2_8.

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Corriou, Jean-Pierre. "Stability Analysis." In Process Control, 117–42. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61143-3_3.

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Corriou, Jean-Pierre. "Stability Analysis." In Process Control, 103–27. London: Springer London, 2004. http://dx.doi.org/10.1007/978-1-4471-3848-8_3.

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Boyadjiev, Christo. "Stability Analysis." In Theoretical Chemical Engineering, 297–401. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10778-8_6.

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Nagurney, Anna, and Ding Zhang. "Stability Analysis." In Projected Dynamical Systems and Variational Inequalities with Applications, 45–74. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4615-2301-7_3.

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Ganguli, Ranjan, and Vijay Panchore. "Stability Analysis." In Foundations of Engineering Mechanics, 83–91. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6098-4_4.

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Dietrich, Alexander. "Stability Analysis." In Springer Tracts in Advanced Robotics, 99–139. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40557-5_5.

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Fei, Zhongyang, Shuang Shi, and Peng Shi. "Stability Analysis." In Analysis and Synthesis for Discrete-Time Switched Systems, 21–37. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-25812-2_2.

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Banichuk, Nikolay, Juha Jeronen, Pekka Neittaanmäki, Tytti Saksa, and Tero Tuovinen. "Stability Analysis." In Mechanics of Moving Materials, 23–67. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01745-7_3.

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Ou, Chang-Yu. "Stability analysis." In Fundamentals of Deep Excavations, 117–67. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780367853853-5.

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Conference papers on the topic "Stability analysi"

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Schmidt, F., and E. Todesco. "Normal form analysis of the LHC dynamic aperture." In Beam stability and nonlinear dynamics. American Institute of Physics, 1997. http://dx.doi.org/10.1063/1.53487.

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Demerly, Jon D., and Kamal Youcef-Toumi. "Non-Linear Analysis of Vehicle Dynamics (NAVDyn): A Reduced Order Model for Vehicle Handling Analysis." In SAE 2000 Automotive Dynamics & Stability Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-1621.

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Van Gorder, Keith, Thomson David, and Janet Basas. "Steering and Suspension Test and Analysis." In SAE 2000 Automotive Dynamics & Stability Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-1626.

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Balandin, Vladimir, Martin Berz, and Nina Golubeva. "Algorithms for the treatment and analysis of spin dynamics in SU(2) and SO(3)." In Beam stability and nonlinear dynamics. American Institute of Physics, 1997. http://dx.doi.org/10.1063/1.53496.

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Heydinger, Gary J., and J. Gavin Howe. "Analysis of Vehicle Response Data Measured During Severe Maneuvers." In SAE 2000 Automotive Dynamics & Stability Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-1644.

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Zellner, J. W., S. A. Kebschull, and R. Michael Van Auken. "Analysis of Vehicle Tip Stability in Side Impact Tests." In SAE 2000 Automotive Dynamics & Stability Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-1650.

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Abdelhaleem, A. Mansour, and D. A. Crolla. "Analysis and Design of Limited Bandwidth Active Hydropneumatic Vehicle Suspension Systems." In SAE 2000 Automotive Dynamics & Stability Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-1631.

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Vaduri, Sunder, and E. Harry Law. "Development of an Expert System for the Analysis of Track Test Data." In SAE 2000 Automotive Dynamics & Stability Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-1628.

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Liu, Qing, Dario Solis, and Weidong Pan. "Analysis of the STI Tire Model." In SAE 2002 Automotive Dynamics & Stability Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2002. http://dx.doi.org/10.4271/2002-01-1579.

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Chang, Kuang-Hua, Xiaoming Yu, and Kyung Choi. "Probabilistic structural stability prediction." In 6th Symposium on Multidisciplinary Analysis and Optimization. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-4064.

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Reports on the topic "Stability analysi"

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Walshire, Lucas, Joseph Dunbar, and Benjamin Breland. Stability analysis of Old River Low Sill Structure. Engineer Research and Development Center (U.S.), September 2022. http://dx.doi.org/10.21079/11681/45349.

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An updated stability analysis was performed on the Old River Low Sill Structure due to a change in the operating conditions from historic river sedimentation. Sedimentation of the Mississippi River channel since the 1973 spring flood has caused higher river stages at lower discharges. Numerical methods used included nonlinear analysis of pile group stability, seepage analyses, and limit equilibrium methods. The structure’s foundation was compromised during the 1973 flood, and emergency repairs were conducted to prevent scouring and undermining of the foundation by the flood scour. Rehabilitation included the reconstruction of a failed wing wall on the left abutment, rock and riprap fill in the forebay channel, and emergency grouting to fill the scour hole beneath the structure. An operating restriction was emplaced to limit the differential head across the structure due to flood damage. Taking these conditions into account, results from an updated analysis showed that full headwater uplift caused increased tension in the piles, while the increased body load caused increased compressive loads in the piles. Review of piezometric monitoring and the seepage analyses showed that full headwater uplift is unlikely, indicating the foundation grouting adequately sealed the scour hole beneath the structure. Analysis results exhibited lower magnitude compression and tension loads in the piles with design load cases compared to previous analyses. Recommendations from these analyses indicate that increased monitoring and additional investigation may support increasing the differential head limitation.
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Hughes, M. H., M. W. Phillps, A. M. M. Todd, J. Krishnaswami, and R. Hartley. High beta and second stability region transport and stability analysis. Office of Scientific and Technical Information (OSTI), September 1992. http://dx.doi.org/10.2172/7192576.

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Author, Not Given. High beta and second stability region transport and stability analysis. Office of Scientific and Technical Information (OSTI), September 1991. http://dx.doi.org/10.2172/5125728.

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Author, Not Given. High beta and second stability region transport and stability analysis. Office of Scientific and Technical Information (OSTI), June 1990. http://dx.doi.org/10.2172/6225021.

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Riley, W. J., and W. J. Riley. Handbook of frequency stability analysis. Gaithersburg, MD: National Institute of Standards and Technology, 2008. http://dx.doi.org/10.6028/nist.sp.1065.

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Ferrier, Bernard, and John Duncan. UAV Deck Recovery Stability Analysis. Fort Belvoir, VA: Defense Technical Information Center, January 2012. http://dx.doi.org/10.21236/ada557352.

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Wagnild, Ross Martin. Stability Analysis of HEG Shot 1443. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1171582.

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Betti, R., R. L. McCrory, and C. P. Verdon. Stability analysis of unsteady ablation fronts. Office of Scientific and Technical Information (OSTI), August 1993. http://dx.doi.org/10.2172/10182380.

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Hughes, M. H., M. W. Phillps, A. M. M. Todd, J. Krishnaswami, and R. Hartley. High beta and second stability region transport and stability analysis. Final report. Office of Scientific and Technical Information (OSTI), September 1992. http://dx.doi.org/10.2172/10183308.

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Hughes, M. H., and M. W. Phillips. High beta and second stability region transport and stability analysis. Final report. Office of Scientific and Technical Information (OSTI), January 1996. http://dx.doi.org/10.2172/661600.

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