Готові списки джерел за темами / Long-Time stability

Добірка наукової літератури з теми "Long-Time stability"

Автор: Grafiati

Опубліковано: 1 червня 2024

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Статті в журналах з теми "Long-Time stability":

Egorychev, L. N. "Long-time temperature stability in thermostats." Measurement Techniques 29, no. 5 (May 1986): 410–13. http://dx.doi.org/10.1007/bf00865945.

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Petit, G., and F. Arias. "Long term stability of atomic time scales." Proceedings of the International Astronomical Union 10, H16 (August 2012): 209–10. http://dx.doi.org/10.1017/s1743921314005444.

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AbstractWe review the stability and accuracy achieved by the reference atomic time scales TAI and TT(BIPM). We show that they presently are in the low 10−16 in relative value, based on the performance of primary standards, of the ensemble time scale and of the time transfer techniques. We consider how the 1 × 10−16 value could be reached or superseded and which are the present limitations to attain this goal.

Khan, Amjad, and Dmitry E. Pelinovsky. "Long-time stability of small FPU solitary waves." Discrete & Continuous Dynamical Systems - A 37, no. 4 (2017): 2065–75. http://dx.doi.org/10.3934/dcds.2017088.

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Yuan, Xiaoping, and Jing Zhang. "Long Time Stability of Hamiltonian Partial Differential Equations." SIAM Journal on Mathematical Analysis 46, no. 5 (January 2014): 3176–222. http://dx.doi.org/10.1137/120900976.

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Fischer, M., B. Hillerich, and F. Kozlowski. "Long-time stability of photoluminescence in porous silicon." Thin Solid Films 372, no. 1-2 (September 2000): 209–11. http://dx.doi.org/10.1016/s0040-6090(00)01054-3.

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Yu, Qiu Ying, Zhi Shen, Mai Cang Zhang, Guo Qing Jia, and Xi Shan Xie. "Long-Time Thermal Structural Stability Study on NiCr20TiAl Alloy." Advanced Materials Research 399-401 (November 2011): 71–75. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.71.

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The coarsening kinetics of main strengthening phase γ′ and the growth behavior of grain boundary carbides have been investigated on NiCr20TiAl alloy aged at 550~750°C for 200~10,000h. The precipitates of NiCr20TiAl alloy at standard heat treatment condition are γ′, M7C3, M23C6 and MC. The coarsening of γ′ precipitates proceeds by Ostwald ripening controlled by volume diffusion in the alloy. Grain boundary carbides M23C6 and M7C3 increase with ageing times and temperatures. The morphologies of precipitates after long-time ageing almost remain the same as that at standard heat treatment condition except 750°C.

Smits, J., H. T. C. Stoof, and P. van der Straten. "On the long-term stability of space-time crystals." New Journal of Physics 22, no. 10 (October 9, 2020): 105001. http://dx.doi.org/10.1088/1367-2630/abbae9.

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Sedlák, Marián. "Long-time stability of multimacroion domains in polyelectrolyte solutions." Journal of Chemical Physics 116, no. 12 (2002): 5246. http://dx.doi.org/10.1063/1.1445110.

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Vernotte, F., and E. Lantz. "Statistical biases and very-long-term time stability analysis." IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 59, no. 3 (March 2012): 523–30. http://dx.doi.org/10.1109/tuffc.2012.2223.

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Pinnaduwage, Lal A., and Yifei Zhu. "Long-time stability of superexcited high Rydberg molecular states." Chemical Physics Letters 277, no. 1-3 (October 1997): 147–52. http://dx.doi.org/10.1016/s0009-2614(97)00913-5.

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Дисертації з теми "Long-Time stability":

Cheng, Bin. "Long time stability of rotational Euler dynamics." College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/7155.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.
Thesis research directed by: Applied Mathematics and Scientific Computation Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

PESSANHA, JOSE EDUARDO ONODA. "VOLTAGE STABILITY PHENOMENON ANALYSIS: TRANSIENT AND LONG TERM TIME DOMAIN SIMULATION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1997. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8941@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Este trabalho analisa o fenômeno da estabilidade de tensão no domínio do tempo incluindo fenômenos rápidos (transitórios) e lentos (longo-termo). As diferentes formas de estabilidade existentes nos sistemas elétricos de potência são definidas e classificadas de acordo com a variável de interesse e com a amplitude do distúrbio. Utilizando-se um simples sistema elétrico de potência, verifica-se através de formulações dinâmicas fatores relevantes ao fenômeno da estabilidade de tensão. Investiga-se a influência de cargas do tipo potência constante e impedância constante sobre a estabilidade de tensão. Compensadores estáticos são incluídos nas análises e verifica-se a existência de regiões de operação onde as ações de controle não apresentam o efeito esperado. Investiga-se através de cenários o efeito adverso de dispositivos de controle com o limitador de sobre- excitação e o transformador de tape variável sobre a estabilidade de tensão. A partir de uma versão do programa de estabilidade transitória TRANSTAB, foram desenvolvidas duas versões do programa computacional VOLTDYN para simular no domínio do tempo o fenômeno da estabilidade de tensão. A primeira versão do programa Utiliza um algoritmo de integração de passo variável usando o método trapezoidal implícito enquanto que a segunda versão utiliza o método de Adams-Bashforth- Moulton. Diversos testes computacionais com as duas versões são realizados comprovando-se a importância desta forma de análise.
This work is concerned with voltage stability analysis in time domain including transient and long-term time frames. Different power system stability forms are defined and classified according to the variable of interest and with the disturbance magnitude. Using a simple power system model, it is shown through dynamics formulations important aspects of the voltage stability phenomenon. Important aspects of load characteristics of constant power type and mixed (constant power/constant impedance) type on voltage stability are investigated. A static compensator model is included in the analysis and it is verified that under specific operation conditions the control actions are not efficient. Scenarios show the adverse effects of long-term control devices such as overexcitation limiters and under load tap changers on voltage stability. One version of the transient stability program TRANSTAB is modified in order to simulate transient and long-term voltage phenomena. The resulting modified computer program is called VOLTDYN. Two versions of the VOLTDYN progran are available. The first version uses a variable step-size algorithm based on the trapezoidal method. The other includes a variable step-size algorithm based on the Adams- Bashforth-Moulton method.

Lee, Chihoon Budhiraja Amarjit. "Long time stability and control problems for stochastic networks in heavy traffic." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,2308.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2008.
Title from electronic title page (viewed Jun. 26, 2009). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Statistics and Operations Research Statistics." Discipline: Statistics and Operations Research; Department/School: Statistics and Operations Research.

Tone, Florentina. "On the long-time stability of numerical schemes for the Navier-Stokes equations." [Bloomington, Ind.] : Indiana University, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3219905.

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Thesis (Ph.D.)--Indiana University, Dept. of Mathematics, 2006.
"Title from dissertation home page (viewed June 28, 2007)." Source: Dissertation Abstracts International, Volume: 67-06, Section: B, page: 3172. Adviser: Roger Temam.

Chevalier, Samuel. "Using Real Time Statistical Data To Improve Long Term Voltage Stability In Stochastic Power Systems." ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/637.

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In order to optimize limited infrastructure, many power systems are frequently operated close to critical, or bifurcation, points. While operating close to such critical points can be economically advantageous, doing so increases the probability of a blackout. With the continued deployment of Phasor Measurement Units (PMUs), high sample rate data are dramatically increasing the real time observability of the power grids. Prior research has shown that the statistics of these data can provide useful information regarding network stability and associated bifurcation proximity. Currently, it is not common practice for transmission and distribution control centers to leverage the higher order statistical properties of PMU data. If grid operators have the tools to determine when these statistics warrant control action, though, then the otherwise unused statistical data present in PMU streams can be transformed into actionable information. In order to address this problem, we present two methods that aim to gauge and improve system stability using the statistics of PMU data. The first method shows how sensitivity factors associated with the spectral analysis of the reduced power flow Jacobian can be used to weight and filter incoming PMU data. We do so by demonstrating how the derived participation factors directly predict the relative strength of bus voltage variances throughout a system. The second method leverages an analytical solver to determine a range of "critical" bus voltage variances. The monitoring and testing of raw statistical data in a highly observable load pocket of a large system are then used to reveal when control actions are needed to mitigate the risk of voltage collapse. A simple reactive power controller is then implemented that pushes the stability of the system back to a stable operating paradigm. Full order dynamic time domain simulations are used in order to test this method on both the IEEE 39 bus system and the 2383 bus Polish system. We also compare this method to two other, more conventional, controllers. The first relies on voltage magnitude signals, and the second depends only on local control of a reactive power resource. This comparison illustrates how the use of statistical information from PMU measurements can substantially improve the performance of voltage collapse mitigation methods.

Yarahmadian, Shantia. "Point wise Green function bounds and long-time stability of large-amplitude noncharacteristic boundary layers." [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3337271.

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Thesis (Ph.D.)--Indiana University, Dept. of Mathematics, 2008.
Title from PDF t.p. (viewed on Jul 28, 2009). Source: Dissertation Abstracts International, Volume: 69-12, Section: B, page: 7553. Adviser: Kevin Zumbrun.

Fedorchuk, Oleksiy [Verfasser]. "Investigations of the long-term stability of a Gas Electron Multipliers and double hit resolution for the highly granular Time-Projection Chamber / Oleksiy Fedorchuk." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2019. http://d-nb.info/1223621138/34.

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Rosas, Martinez Luis. "Study of two wave propagation problems in electromagnetic dispersive media : 1) Long-time stability analysis in Drude-Lorentz media; 2) Transmission between a slab of metamaterial on a dielectric." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAE011.

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Cette thèse traite de deux problèmes indépendants liés aux phénomènes de propagation des ondes dans les milieux dispersifs. Dans la première partie, nous étudions le comportement en temps long des solutions des équations de Maxwell dans des milieux dissipatifs généralisés de Drude-Lorentz. Plus précisément, nous souhaitons quantifier les pertes dans de tels milieux à l'aide du taux de décroissance de l'énergie électromagnétique pour le problème de Cauchy correspondant. Cette première partie est elle-même composée de deux approches. La première, l'approche par fonctions de Lyapunov en fréquence, consiste à obtenir une inégalité différentielle (en temps) pour certaines fonctionnelles de la solution, les fonctions de Lyapunov L(k) où k désigne la fréquence spatiale. Les estimations de stabilité sont ensuite obtenues par l'intégration en temps de l'inégalité différentielle. En développant cette méthode, nous obtenons un résultat de stabilité polynomiale sous des hypothèses de dissipation fortes. La deuxième approche, l'approche modale, exploite les propriétés spectrales de l'opérateur hamiltonien apparaissant dans le problème de Cauchy. Cette dernière approche améliore la première en autorisant des hypothèses de dissipation faibles. Dans la deuxième partie du travail, nous nous intéressons au problème de transmission d'une couche de métamatériau de Drude non dissipatif dans un milieu diélectrique. Dans ce contexte, nous considérons les équations de Maxwell temporelles bidimensionnel en polarisation TM et nous les reformulons en une équation de Schrödinger dont le Hamiltonien, A, est un opérateur autoadjoint non borné. La transformation de Fourier nous permet de travailler avec des Hamiltoniens réduits A(k), k ∈ R. Enfin, nous nous intéressons au spectre ponctuel du Hamiltonien réduit qui est lié aux modes guidés du problème original. Cette étude débouche sur une relation de dispersion dont la difficulté réside dans son caractère hautement non linéaire par rapport au paramètre spectral. Nous prouvons l'existence d'une infinité dénombrable de branches de solutions pour la relation de dispersion : les courbes de dispersion. Nous donnons une analyse précise de ces courbes et mettons en lumière, notamment, l'existence d'ondes guidées correspondant à des palsmons surface
This PhD thesis addresses two independent problems related to wave propagation phenomena in dispersive media. In the first part, we investigate the long-time behavior of solutions of Maxwell’s equations in dissipative generalized Drude-Lorentz media. More precisely, we wish to quantify the loss in such media in terms of the decay rate of the electromagnetic energy for the corresponding Cauchy problem. This first part is in turn composed by two approaches. The first one, namely, the frequency dependent Lyapunov approach, consists in deriving a differential inequality (in time) for certain functionals of the solution, the Lyapunov functions L(k), where k is the spatial frequency. The stability estimates are then obtained from the time integration of the differential inequality. By developing this method, we obtain a polynomial stability result under strong dissipative assumptions. The second approach, the modal approach, exploits the spectral properties of the Hamiltonian operator appearing in the Cauchy problem. This last approach ameliorates the first one by considering weak dissipation assumptions. In the second part of the work, we are interested in the transmission problem of a slab of non-dissipative Drude metamaterial within a dielectric. In this context, we consider the TM two dimensional time-dependent Maxwell’s equations and we reformulate it into a Schrödinger equation whose Hamiltonian, A, is a unbounded self-adjoint operator. Fourier transform allow us to work with the reduced Hamiltonians A(k), k ∈ R. Finally, we are interested in the point spectrum of the reduced Hamiltonian which is related to the guided modes of the original problem. This study leads to a diseprsion relation whose difficulty lies in its highly non-linear character with respect to the spectral parameter. We prove the existence of a countable infinity of solution branches for the dispersion relation: the so-called dispersion curves. We give a precise analysis of these curves and enlighten the existence of guided waves which correspond to surface plasmons

Collot, Charles. "Sur l’explosion critique et surcritique pour les équations des ondes et de la chaleur semi-linéaires." Thesis, Université Côte d'Azur (ComUE), 2016. http://www.theses.fr/2016AZUR4095/document.

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Cette thèse porte sur l’étude des propriétés qualitatives des solutions des équations des ondes et de la chaleur semi-linéaires. Les résultats qui y sont décrits sont les suivants. Les deux premiers concernent l’existence et la description de dynamiques explosives de concentration en temps fini de l’état stationnaire à symétrie radiale dans le régime dit énergie surcritique ; en outre, pour l’équation des ondes la stabilité de ces phénomènes est étudiée dans le cas radial, et pour l’équation de la chaleur le cas plus général d’un domaine borné avec conditions de Dirichlet au bord est considéré. Le troisième porte sur la classification des dynamiques possibles près de l’état stationnaire radial pour l’équation de la chaleur dans le régime dit énergie critique, trois scénarios ayant lieu : la stabilisation, l’instabilité par explosion auto-similaire à profil explosif constant en espace, et l’instabilité par dissipation vers la solution nulle. Enfin, le quatrième a pour objet l’existence et la stabilité de profils explosifs auto-similaires non constants en espace pour l’équation de la chaleur dans le cas énergie surcritique
This thesis is devoted to the study of qualitative properties for solutions to the semilinear heat and wave equations. The results that are described are the following. The first two concern the existence and description of blow-up dynamics in which the radially symmetric stationary state is concentrated in finite time in the so-called energy supercritical regime; in addition, for the wave equation the stability of these phenomena is studied in the radial case, and for the heat equation the more general case of a bounded domain with Dirichlet condition at the boundary is considered. The third one deals with the classification of the possible dynamics near the radial stationary state for the heat equation in the so-called energy critical regime, where three scenarii occur: stabilization, instability by blow-up with the constant in space blow-up profile, and instability by dissipation to the null solution. Eventually, in the forth result we investigate the existence and the stability of self-similar blow-up profiles that are not constant in space, for the heat equation in the energy supercritical case

Esliker, Rebecca. "An Examination of Social Support, Contentment with Life and Time Spent in an Assisted Living Setting." ScholarWorks, 2015. https://scholarworks.waldenu.edu/dissertations/882.

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Policies at assisted living facilities should be designed to develop high quality social relationships among older persons that could increase the contentment of the residents. Despite the broad consensus on this mission, the role of social support in the perceived contentment of assisted living facility residents has not been adequately explored. Using social network theory as the framework for this study, the purpose of this quantitative study was to determine whether (a) perceived level of social support was related to perceived level of contentment with life among assisted living facility residents, (b) the length of time spent in the facility was related to perceived levels of contentment, and (c) perceived social support moderated the relationship between the length of time in the facility and perceived levels of contentment with life. The sample included 100 residents from 2 assisted living facilities in North Carolina. The Multidimensional Scale of Perceived Social Support and the Generalized Contentment Scale were used in this study. Linear regression analyses were employed to answer the research questions. Participants with higher levels of perceived social support tended to have higher levels of perceived contentment with life, and the length of time residents had spent in the facility was not related to their perceived contentment with life. In addition, levels of social support did not moderate the relationship between the length of time respondents had been in the facility and contentment; age, gender, ethnicity, and marital status were not related to perceived contentment with life. This study leads to positive social change by providing long-term care providers with information on social support systems and how staff can create conditions for them to enjoy better social relationships and experience greater support, thereby facilitating their contentment with life.

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Книги з теми "Long-Time stability":

Dark, K. R. The waves of time: Long-term change and international relations. London: Pinter, 1998.

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Dark, K. R. The Waves of Time: Long-Term Change and International Relations. Continuum International Publishing Group, 2001.

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Dark, K. R. The Waves of Time: Long-Term Change and International Relations. Bloomsbury Academic, 2016.

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Dark, K. R. Waves Of Time: Long-term Change And International Relations (Continuum Collection). Continuum International Publishing Group, 2005.

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Simmons, Joel. Politics of Technological Progress: Parties, Time Horizons and Long-Term Economic Development. Cambridge University Press, 2016.

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Port, Andrew I. Democracy and Dictatorship in the Cold War: the Two Germanies, 1949–1961. Edited by Helmut Walser Smith. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780199237395.013.0027.

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The ‘long 1950s’ was a decade of conspicuous contrasts: a time of dismantling and reconstruction, economic and political, as well as cultural and moral; a time of Americanization and Sovietization; a time of upheaval amid a desperate search for stability. But above all, it was a time for both forgetting and coming to terms with the recent past. This article focuses on the two forms of government that controlled Germany, democracy, and dictatorship. The Cold War was without doubt the main reason for the rapid rehabilitation and integration of the two German states, which more or less took place within a decade following the end of the Second World War. This article further elaborates upon the political conditions under dictatorship and its effect on the social life. East Germany, under the Soviet control underwent as much political upheaval. It was not until the second half of the twentieth century that Germany became a democracy.

Rosenblatt, Fernando. Party Vibrancy and Democracy in Latin America. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190870041.001.0001.

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How do political parties remain vibrant organizations? This qualitative study of political parties in Chile, Costa Rica, and Uruguay explains how party vibrancy is maintained and reproduced over time. A vibrant party is an active organization that operates beyond electoral cycles, has clear symbols, and maintains a significant presence in the territory. The study identifies the complex interaction between four causal factors that account for the reproduction of party vibrancy: Purpose, Trauma, Channels of Ambition, and moderate Exit Barriers. Purpose activates retrospective loyalty among members. Trauma refers to a shared traumatic past that engenders retrospective loyalty. Channels of Ambition are routes by which individuals can pursue a political career. Moderate Exit Barriers are rules that set costs of defection at reasonable levels. The case studies suggest that, after a process of consolidation and stability, the presence of the four causal factors explains party vibrancy. The presence of the factors then sustains the reproduction of this vibrancy over time. The four causal factors are observed during a party’s “golden age.” Vibrant parties are resilient. Yet the study also shows that the ability of Trauma to forge loyalty decreases over time and that the long-term reproduction of Purpose can be elusive, as has been shown in Latin America. Older vibrant parties thus exhibit a combination of only Channels of Ambition and moderate Exit Barriers, and are less resilient than those that also have Purpose and/or Trauma.

Wendt, Simon. The Daughters of the American Revolution and Patriotic Memory in the Twentieth Century. University Press of Florida, 2020. http://dx.doi.org/10.5744/florida/9780813066608.001.0001.

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This book is a comprehensive account of the Daughters of the American Revolution (DAR) and its efforts to keep alive the memory of the nation’s past. It argues that, especially prior to World War II, the DAR’s conservative white middle-class members played a vital role in private citizens’ efforts to both bolster patriotism and guard the nation’s gendered and racial boundaries through commemorative practices. The Daughters engaged in patriotic activism long believed to be the domain of men and deliberately challenged male-centered accounts of US nation-building. At the same time, however, their tales about the past helped reinforce traditional notions of femininity and masculinity, reflecting a strong-held belief that any challenge to these traditions would jeopardize the nation’s stability. In a similar fashion, the organization frequently voiced support for inclusive civic nationalism, but deliberately used memory to consolidate Anglo-Saxon whiteness and keep the nation’s racial divisions in place. By closely examining these ambiguities, this study sheds fresh light on white conservative women’s remarkable agency in US nationalism and explains the tenacity of a particular nationalist ideology that deemed ingrained gender and race hierarchies vital to America’s unity and progress.

Henderson, Lorna K., Brian J. Nankivell, and Jeremy R. Chapman. Chronic allograft dysfunction. Edited by Jeremy R. Chapman. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199592548.003.0286.

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Despite improvements in short-term renal allograft survival, long-term survival has not appreciably changed. Excepting death with a functioning graft, most late graft loss results from chronic allograft dysfunction. Immune and non-immune-mediated injuries contribute to graft dysfunction over time, ultimately leading to a non-specific and irreversible histological end-point of fibrosis, tubular atrophy, and glomerulosclerosis. Screening and early identification of pathology is crucial to allow timely intervention in order to prevent permanent nephron damage and graft loss. This chapter outlines assessment of renal dysfunction following transplantation, defines the causes of chronic allograft failure, and their pathophysiology, and evaluates current therapeutic strategies used to improve or stabilize chronic allograft dysfunction.

Francisco, Louçã, and Ash Michael. A Long Stagnation, or Capitalism without Growth. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198828211.003.0012.

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Chapter 11 assesses the growth prospects of the world economy. The history of global economic doomsaying is traced briefly, a frequently reasonable position that has not done well with the facts for the past hundred years. Capitalism has been adept at escaping from the pit and pendulum. A set of global imbalances is then reviewed that are seen as posing a severe threat to global economic stability and certainly to the prospects for sustainable and equitable growth. The Great Recession following the Crash of 2007–8 might be “different this time.” Historical and contemporary fears of “secular stagnation” are discussed but the speculative nature of stagnationist assessments is acknowledged.

Частини книг з теми "Long-Time stability":

Celletti, Alessandra. "Long-time stability." In Stability and Chaos in Celestial Mechanics, 177–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-85146-2_8.

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Müller, Peter. "Stability and Long-Time Behavior." In Handbook of Dynamics and Probability, 75–109. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-88486-4_4.

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Ferrándiz, José M., M. Eugenia Sansaturio, and Jesús Vigo. "Long-Time Predictions of Satellite Orbits by Numerical Integration." In Predictability, Stability, and Chaos in N-Body Dynamical Systems, 387–94. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-5997-5_32.

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Öffner, Philipp. "Long-time Error Behavior of Discontinuous Galerkin and Flux Reconstruction." In Approximation and Stability Properties of Numerical Methods for Hyperbolic Conservation Laws, 135–93. Wiesbaden: Springer Fachmedien Wiesbaden, 2023. http://dx.doi.org/10.1007/978-3-658-42620-0_4.

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Kodama, Nathan X., and Roberto F. Galán. "Linear Stability of Spontaneously Active Local Cortical Circuits: Is There Criticality on Long Time Scales?" In Springer Series on Bio- and Neurosystems, 139–57. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20965-0_8.

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Barucq, Héléne. "A Family of First-Order Conditions for the Long-Time Stability of the Maxwell System." In Mathematical and Numerical Aspects of Wave Propagation WAVES 2003, 377–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55856-6_60.

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Chen, Jianhang, Yongliang Li, and Junwen Zhang. "Analytical Modelling Rock Bolts with a Closed Nonlinear Model." In Bond Failure Mechanism of Fully Grouted Rock Bolts, 99–111. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0498-3_7.

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AbstractRock bolts have been used in the mining industry for a long time. They are used as the reinforcement tendons to keep the stability of openings in underground mining and the slope in open-pit mining.

Calvo, M., S. Rosat, J. Hinderer, H. Legros, J. P. Boy, and U. Riccardi. "Study of the Time Stability of Tides Using a Long Term (1973–2011) Gravity Record at Strasbourg, France." In International Association of Geodesy Symposia, 377–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37222-3_50.

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Galdi, G. P. "Stability of Permanent Rotations and Long-Time Behavior of Inertial Motions of a Rigid Body with an Interior Liquid-Filled Cavity." In Particles in Flows, 217–53. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60282-0_4.

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Chen, Lin, Yaan Hu, Zhonghua Li, and Chao Guo. "Study on the Mechanism of Water Loss and Capsizing of Multi - point Suspension Ship Lift." In Lecture Notes in Civil Engineering, 668–79. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_58.

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AbstractThe stability of ship lift chamber operation has always been the key factor restricting the development of ship lift, which has not been well solved for a long time. With the development of upsizing of ships, the super-huge fully balanced ship lift with hoisting steel wire rope over 10000–15000 t is the development trend in the future. The mechanism of water loss and capsizing of multi-point ship lift is the most key scientific problem, and the most core technical problem is the layout and operation control of ship lift system. A generalized physical model of ship lift with the model scale of 1:33 was established to study the influence of multiple factors on water loss stability of ship chamber, such as gravity counterweight/torque counterweight ratio, water leakage flow, the position of suspension points among the chamber, quantity of the suspension points, and so on. Secondly, the structural dynamics equations of hoisting system is deduced in detail, considering the water fluctuation in the process of water loss caused by longitudinal capsizing moment influence on balance system, and research on the transient dynamic characteristics of hoisting system of the filtration process, determine the ship chamber conditions of stability for the trim through the Lyapunov stability criterion. The optimization calculation model of ship lift mechanical suspension system layout under the action of multiple constraints was established, and the effective measures will be given to improve the pitch stability. The results can provide technical guidance for the upsizing of ship lifters.

Тези доповідей конференцій з теми "Long-Time stability":

Kalliomaki, K., T. Mansten, H. Koivula, and J. Mannermaa. "Long term time stability of conventional GPS receivers." In 2009 Joint Meeting of the European Frequency and Time Forum (EFTF) and the IEEE International Frequency Control Symposium (FCS). IEEE, 2009. http://dx.doi.org/10.1109/freq.2009.5168279.

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Gao, Zhe, Ji-Hai Zhang, Wei-Xiong Wang, Wen-Jun Wu, and Shao-Wu Dong. "Long-Term Stability of GPS Time Transfer Link." In 2023 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS). IEEE, 2023. http://dx.doi.org/10.1109/eftf/ifcs57587.2023.10272046.

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Radavich, J. F. "Long Time Stability of a Wrought Alloy 718 Disk." In Superalloys. TMS, 1989. http://dx.doi.org/10.7449/1989/superalloys_1989_257_268.

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Georgiadis, Christos, and Wolfram Kleuver. "Precision blood-leak detector with high long-time stability." In International Symposium on Photonics and Applications, edited by Robert A. Lieberman, Anand K. Asundi, and Hiroshi Asanuma. SPIE, 1999. http://dx.doi.org/10.1117/12.369294.

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Vernotte, Francois, and Eric Lantz. "Statistical biases and very long term time stability analysis." In 2011 Joint Conference of the IEEE International Frequency Control and the European Frequency and Time Forum (FCS). IEEE, 2011. http://dx.doi.org/10.1109/fcs.2011.5977796.

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Kalenik, J., P. Firek, J. Szmidt, E. Czerwosz, M. Kozłowski, I. Stępińska, and T. Wódka. "Long time stability of lamps with nanostructural carbon field emission cathodes." In Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2017, edited by Ryszard S. Romaniuk and Maciej Linczuk. SPIE, 2017. http://dx.doi.org/10.1117/12.2280971.

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Lowe, D. "Complexity modelling and stability characterisation for long term iterated time series prediction." In Fifth International Conference on Artificial Neural Networks. IEE, 1997. http://dx.doi.org/10.1049/cp:19970701.

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Xie, Sicong, Chao Lu, Lipeng Zhu, and Jingyi Zhang. "Online Long-term Voltage Stability Assessment Based on Time Series Shapelet Extraction." In 2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia). IEEE, 2018. http://dx.doi.org/10.1109/isgt-asia.2018.8467783.

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Shiyang Li and Venkataramana Ajjarapu. "Real-time monitoring of long-term voltage stability via local linear regression." In 2015 IEEE Power & Energy Society General Meeting. IEEE, 2015. http://dx.doi.org/10.1109/pesgm.2015.7286597.

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Li, Shiyang, and Venkataramana Ajjarapu. "Real-time monitoring of long-term voltage stability via convolutional neural network." In 2017 IEEE Power & Energy Society General Meeting (PESGM). IEEE, 2017. http://dx.doi.org/10.1109/pesgm.2017.8274406.

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Звіти організацій з теми "Long-Time stability":

Johra, Hicham. Long-Term Stability and Calibration of the Reference Thermometer ASL F200. Department of the Built Environment, Aalborg University, December 2019. http://dx.doi.org/10.54337/aau328894425.

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The aim of this technical report is to provide detailed information about the long-term stability of the thermometer ASL F200 (WIKA Instruments Limited [1]) that is used as temperature reference to calibrate other temperature sensors in the Laboratory of Building Energy and Indoor Environment at Aalborg University – Department of the Built Environment [2]. This ASL F200 thermometer is regularly sent for recalibration at the “Temperature Laboratory” of the Danish Technological Institute, which is a National Reference Laboratory [3]. In this report, the stability of the thermometer is assessed as the difference in the temperature reading of the instrument at a specific temperature over time. The latter is calculated as the yearly deviation (or stability) in between consecutive recalibrations, which is equivalent to the difference in the calibration correction term in between two consecutive recalibrations divided by the elapsed time in between these two consecutive recalibrations. The long-term stability of the ASL F200 thermometer is only assessed here for the first channel “Chan 1” of the instrument. All calculations of this technical report are based on calibrations reports from the National Reference Laboratory of the Danish Technological Institute [3]. The main results of those calibration reports can be found in the Appendix at the end of this document.

Baliki, Ghassan, Dorothee Weiffen, Melodie Al Daccache, Aysegül Kayaoglu, Lara Sujud, Hadi Jaafar, Hala Ghattas, and Tilman Brück. Seeds for recovery: The long-term impacts of a complex agricultural intervention on welfare, behaviour and stability in Syria (SEEDS). Centre for Excellence and Development Impact and Learning (CEDIL), April 2023. http://dx.doi.org/10.51744/crpp7.

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There is scarce evidence on whether and how assistance in humanitarian emergencies and conflict settings impacts household well-being and behaviour. Conducting rigorous impact evaluations in such settings poses multiple challenges in design and data collection. In SEEDS, we evaluate the impact of a complex large-scale multi-arm agricultural intervention on productivity, food security, and resilience in the context of an on-going humanitarian crisis in Syria. Specifically, we identify the causal impacts of agricultural asset transfers over various time horizons (the short-, medium-, and long-run), and across different conditions and subgroups (gender and conflict intensity) at the household-level. We evaluate the effectiveness of irrigation rehabilitation separately at the community-level. We use and combine various data sources, including a unique survey panel dataset collected over a period of four years from multiple governorates in Syria, satellite remote-sensing data, and publicly available violent conflict incidence and weather data. Our findings from using cutting-edge machine and deep learning approaches together with innovative balancing and analytical methods can be summarised as follows: For average treatment effects at the household-level, we find that the provision of agricultural asset support leads to significant improvements in food security in the short- and long-term, three years after the intervention. The positive and significant effect on food security is driven mainly by the increased consumption of healthy food items such as vegetables. In the long-run, livestock support reduces the use of harmful coping strategies households employ to deal with food shortages. Interestingly, we find that households who received vegetable kits are not just less likely to sell their productive assets in the long-term but also are less likely to marry off their young daughters or send their children to work. Overall, we find that both agricultural and livestock asset support is key to improving households’ resilience in the long-term. The irrigation rehabilitation interventions at the community-level positively affected agricultural productivity compared to the pre-intervention and pre-conflict periods. However, these effects were only significantly pronounced in the spring season. As for the heterogeneity analysis, we find that female-headed households benefit remarkably more in terms of food security in the medium-term compared to male-headed families. Moreover, households residing in areas that are moderately affected by violent conflict show stronger food security improvements compared to households from peaceful or conflict-intense settings. Overall, we draw three overarching lessons from our findings in SEEDS: First, agricultural support in protracted conflict settings effectively improves the long-term welfare and resilience of vulnerable households. In fact, the presence of an ongoing humanitarian operation acts as a social safety net if circumstances deteriorate suddenly. Second, not all interventions are equally effective, and not all households equally benefit, underscoring the need to design and implement inclusive context-specific interventions with detailed targeting. Third, methodologically, using multiple remote data sources and machine learning methods help overcome challenges in conducting rigorous impact evaluations in hard-to-reach humanitarian emergency settings.

Hall, Zanker, and Kelner. PR-343-06605-R02 USM Recalibration Frequency. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), August 2009. http://dx.doi.org/10.55274/r0010155.

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This program is intended to improve the understanding of the stability over time of gas multi-path ultrasonic flow meters (USMs). Within the Natural Gas Industry, there are currently on universal standards requiring periodic recalibration of USMs. Removing these flow meters from serviced for recalibration is costly and inconvenient. However, the primary reason that a recalibration standard does not exist is the lack of definitive data regarding the long-term stability of installed USMs. In order to address this situation, collection and analysis of data was performed to help formulate a recalibration guideline. Specific tasks include: (1) review and utilization of existing published technical papers, (2) working with certified flow calibration facilities to obtain data, (3) obtaining data from USM manufactures on changing of electronics and/or transducers, (4) obtaining historical recalibration data, and (5) participation in selected recalibrations by PRCI member companies.

Saboin, José Luis, Jorge Hirs, Leandro Gaston Andrian, and Augusto Chávez. The Evolution of External Shocks and Macrofiscal Outcomes in the Andes. Inter-American Development Bank, May 2024. http://dx.doi.org/10.18235/0012972.

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The abundance of natural resources can adversely affect the macroeconomic stability of countries. Developing economic institutions that support the proper management of extractive industry resources is one of the fundamental factors for maintaining macroeconomic stability and generating long-term economic growth. This paper evaluates the impact of terms-of-trade shocks on fiscal performance and economic growth in the countries of the Andean region. To adequately capture the variation in both the magnitude of shocks and the sensitivity of economic and fiscal variables to those shocks, this paper makes use of a TV-SVAR model. This method allows us to evaluate whether the presence of fiscal institutions change their sensitivity to external disturbances. The results presented in this paper show a time-varying dynamic of both (1) terms-of-trade shocks and (2) the sensitivity of the Andean regions economies to such shocks, although with marked heterogeneity across countries. This heterogeneity coincides with the uneven development of the economic institutions in the countries of the region. The results highlight the importance of developing adequate economic policy frameworks in order to adequately mitigate the volatility in the terms-of-trade.

Yu, Y. S. Capabilities, limitations and the use of the GEOROC computer package. Natural Resources Canada/CMSS/Information Management, 1987. http://dx.doi.org/10.4095/325534.

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Computer codes have been used by various researchers in modelling viscoelastic formations, with a good degree of success. Serata used a complex rheological model, REM (Rheological Element Model) code, to simulate mine openings [2]. Others, in the U.S. Nuclear Waste Isolation Programme, have evaluated the capability of various codes for the design of nuclear waste repository [3]. Because of the proprietary nature of the above codes, they are not available to mine operators in Canada. Consequently, in 1984, CANMET initiated a research project to develop a numerical modelling package for use in the design of underground potash mine openings. GEOROC is the resultant computer program; it was developed by RE/SPEC Ltd., of Calgary under contract to CANMET. In recent years, computer simulation is playing an increasingly important role in evaluating the short and long term structural stability of underground mine openings, and in ground control studies related to mine design and layout. Such simulations are increasingly being used in the design of underground salt and potash mines. Because of the viscoelastic nature of salt rock formations, simulation models must take into consideration their time dependent properties if they are to correctly predict opening closures, ground stresses, and ground stability based on prescribed failure criteria. This presentation describes the capabilities, limitations and the use of computer code - GEOROC. A case history in which GEOROC is used to simulate a typical room and pillar mining section of a Western Canadian potash mine is provided. Predicted ground behaviour using the code is compared with actual behaviour as determined through field measurements. Results indicate that good correlation exits between predicted and measured ground behaviour, and is an encouragement to greater use of modelling in mine stability studies related to mine design.

Xylia, Maria, Faisal Bin Ashraf, Peter Rudberg, Karina Barquet, and Guoyi Han. Keeping the flow: hydropower, river ecosystems and governance in northern Sweden. Stockholm Environment Institute, February 2024. http://dx.doi.org/10.51414/sei2024sei2024.014.

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The focus of this report is hydropower generated in the Norrbotten region of Sweden, in the larger context of the Nordic and EU regions. Recognizing hydropower’s changing role in meeting growing energy demand is crucial. Hydropower provides energy security and grid stability for Sweden, which has long relied on the low-carbon energy source for much of its electricity. Industrial expansion, particularly in northern Sweden, is expected to drive a substantial increase in energy demand, leading to more demand for hydropower. At the same time, more renewable energy will be added to the Swedish electricity grid and beyond, and hydropower will play a key role in stabilizing the grid to make space for wind and solar power. With this increase will come more impact on river ecosystems, particularly through hydropeaking, i.e. where hydropower operation is optimized creating frequent and large changes of river flow, which is of significant concern for environmental impacts. Balancing hydropower production with the preservation of biodiversity and ecosystem health is essential and part of the policy priorities of the EU and Sweden. To ensure the long-term success of the hydropower industry, efforts need to be emphasized to improve efficiency, promote biodiversity and incorporate community perspectives. Additionally, strategies for adapting to a changing energy landscape, such as accommodating fluctuating renewable energy sources, are vital.

Livensperger, Carolyn, and Dana Witwicki. Status and trend of upland vegetation and soils at Dinosaur National Monument, 2010?2020. National Park Service, 2024. http://dx.doi.org/10.36967/2302751.

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In 2009, the Northern Colorado Plateau Network began long-term monitoring of pinyon-juniper woodlands, high-elevation sagebrush, and low-elevation sagebrush shrublands in Dinosaur National Monument. Sagebrush communities have been impacted by fire and grazing in the past, and some areas have converted to an alternative grassland state, which can be dominated by native or exotic species. Pinyon-juniper woodlands are varied in structure but comprise the majority of plant communities throughout the monument. The primary goals of this monitoring are to track the status of these ecosystems and determine trends, or how they are changing over time. This report summarizes ten years of monitoring data and addresses the following questions: (1) What is the status and trend of vegetation and soil indicators for high-elevation sagebrush, low-elevation sagebrush, and pinyon-juniper woodland communities?, and (2) How do climate, grazing, and fire history influence observed status and trend? Results showed that in sagebrush communities, native cool-season perennial grasses decreased in cover while exotic annuals rapidly increased. Cover of big sagebrush (Artemisia tridentata) was on the lower end of known reference conditions but slowly increasing. Biological soil crust and soil stability were both increasing in sagebrush communities indicating improving conditions, but bare soil was also increasing in high-elevation sagebrush. In pinyon-juniper woodlands located in the south-central area of the monument, tree cover was stable but sapling density was decreasing. Cover of exotic species was low in pinyon-juniper woodlands. Managers should consider actions to control the rapid increase of exotic species (primarily cheatgrass) and protect native cool-season grasses in high- and low-elevation sagebrush communities.

Azzi, Elias S., Cecilia Sundberg, Helena Söderqvist, Tom Källgren, Harald Cederlund, and Haichao Li. Guidelines for estimation of biochar durability : Background report. Department of Energy and Technology, Swedish University of Agricultural Sciences, 2023. http://dx.doi.org/10.54612/a.lkbuavb9qc.

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Biochar is produced by heating biomass in the total or partial absence of oxygen. This report addresses the long-term persistence of biochar in soil and how this can be managed in climate calculations and reporting. The report consists of this summary and four chapters, which can be read independently. Different terms have been used to describe the durability of biochar carbon storage, but also the physical presence of biochar in soils, e.g. persistence, permanence, recalcitrance, residence times, stability. Today, the term “durability of carbon storage” is preferred in policy contexts, but various academic disciplines such as soil science have other established terms like “persistence”. Here, both durability and persistence are used, rather interchangeably. It is important to be aware of differences in meaning that exist between disciplines. The purpose of this report is to present the state of knowledge regarding the proportion of carbon in biochar that remains in the soil over time and provide recommendations for calculating this. There is a need to calculate the persistence of biochar in soil for national climate reporting, corporate climate reporting, carbon credit trading, and life cycle assessments for various purposes. On the persistence of biochar The amount of biochar remaining after a certain time depends on the properties of the biochar and the environment in which it is located. Nearly all research on biochar persistence has focused on its application in agricultural soils. The main reason for the high durability of biochar carbon storage is the formation of fused aromatic stable structures during biomass pyrolysis. A high degree of fused aromatic structures makes biochar much less prone to microbial decomposition than fresh biomass. Different biochars have different properties, and this influences how long they persist in the soil. To achieve biochar with properties that provide higher persistence, it should be produced at higher temperatures for a sufficient duration. Measuring and calculating biochar persistence Established quantification methods of 100-year biochar persistence (e.g. referenced in IPCC inventory guidelines and used in voluntary carbon markets, to date) extrapolate short-term soil decomposition processes, and do not fully consider the processes that may explain millennial persistence. Calculations regarding biochar persistence have traditionally used a time span of 100 years to describe the amount of remaining carbon after a certain time. The use of specifically 100 years lacks a well founded scientific reason, but has been regarded as “far enough” into the future from a climate perspective and close enough for modelling to be meaningful. An active area of research relevant for the understanding biochar carbon storage durability is the development of advanced analytical characterisation methods of biochar that will enable measurement of the physicochemical heterogeneity in carbon structures present in biochar. Another area of continued research is biochar incubation, with a focus on field conditions, to elucidate both differences from laboratory conditions, and how transport processes affect biochar in the field. Recommendation and conclusion In the project, available research data has been aggregated into a functional model that calculates how much of the carbon in biochar remains after a given number of years. The model is based on the H/C ratio of the biochar placed in the soil and the annual average temperature at the location. The model is made freely accessible to provide biochar market actors with the best available knowledge for estimating the durability of biochar carbon. Existing research results provide a sufficient foundation for estimation of the amount of biochar expected to remain over time. Future research results are expected to lead to increased knowledge regarding the decomposition properties of biochar, in particular biochars with a very low H/C ratio. Therefore, this recommendation will be revised by the end of the project in 2025.

Chandrasekhar, C. P. The Long Search for Stability: Financial Cooperation to Address Global Risks in the East Asian Region. Institute for New Economic Thinking Working Paper Series, March 2021. http://dx.doi.org/10.36687/inetwp153.

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Forced by the 1997 Southeast Asian crisis to recognize the external vulnerabilities that openness to volatile capital flows result in and upset over the post-crisis policy responses imposed by the IMF, countries in the sub-region saw the need for a regional financial safety net that can pre-empt or mitigate future crises. At the outset, the aim of the initiative, then led by Japan, was to create a facility or design a mechanism that was independent of the United States and the IMF, since the former was less concerned with vulnerabilities in Asia than it was in Latin America and that the latter’s recommendations proved damaging for countries in the region. But US opposition and inherited geopolitical tensions in the region blocked Japan’s initial proposal to establish an Asian Monetary Fund, a kind of regional IMF. As an alternative, the ASEAN+3 grouping (ASEAN members plus China, Japan and South Korea) opted for more flexible arrangements, at the core of which was a network of multilateral and bilateral central bank swap agreements. While central bank swap agreements have played a role in crisis management, the effort to make them the central instruments of a cooperatively established regional safety net, the Chiang Mai Initiative, failed. During the crises of 2008 and 2020 countries covered by the Initiative chose not to rely on the facility, preferring to turn to multilateral institutions such as the ADB, World Bank and IMF or enter into bilateral agreements within and outside the region for assistance. The fundamental problem was that because of an effort to appease the US and the IMF and the use of the IMF as a foil against the dominance of a regional power like Japan, the regional arrangement was not a real alternative to traditional sources of balance of payments support. In particular, access to significant financial assistance under the arrangement required a country to be supported first by an IMF program and be subject to the IMF’s conditions and surveillance. The failure of the multilateral effort meant that a specifically Asian safety net independent of the US and the IMF had to be one constructed by a regional power involving support for a network of bilateral agreements. Japan was the first regional power to seek to build such a network through it post-1997 Miyazawa Initiative. But its own complex relationship with the US meant that its intervention could not be sustained, more so because of the crisis that engulfed Japan in 1990. But the prospect of regional independence in crisis resolution has revived with the rise of China as a regional and global power. This time both economics and China’s independence from the US seem to improve prospects of successful regional cooperation to address financial vulnerability. A history of tensions between China and its neighbours and the fear of Chinese dominance may yet lead to one more failure. But, as of now, the Belt and Road Initiative, China’s support for a large number of bilateral swap arrangements and its participation in the Regional Comprehensive Economic Partnership seem to suggest that Asian countries may finally come into their own.

Weissinger, Rebecca. Status and trends of springs at Hovenweep National Monument, 1999–2021. Edited by Alice Wondrak Biel. National Park Service, August 2023. http://dx.doi.org/10.36967/2294373.

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Water is a scarce, but vital, resource at Hovenweep National Monument (NM). The National Park Service has prioritized long-term monitoring of water resources at the monument through a variety of programs and indicators since 1999. The purpose of this report is to evaluate water-quantity and water-quality data collected at long-term monitoring sites in Hovenweep NM from 1999 to 2021 for trends over time, and to summarize site-characterization data for currently monitored locations. Data are available for three active monitoring stations—Square Tower Spring, Hackberry Pool, and Goodman Point Spring—and three discontinued monitoring stations—Cajon Pool, Upper Hackberry Spring (Spring #4), and Horseshoe Spring. Water resources at Hovenweep NM have exhibited many trends over the past two decades. Pool levels at both Square Tower Spring and Hackberry Pool went up, with a step increase shown in 2016 (after no sampling in 2014–2015). In contrast, flow decreased by more than half at Goodman Point Spring and ceased at Upper Hackberry Spring (Spring #4). Flow at Horseshoe Spring also decreased, although the period of record at this site was very short. Both Upper Hackberry Spring (Spring #4) and Horseshoe Spring were removed from the monitoring rotation because flows were increasingly absent or too low to measure. Pool-level dynamics and water chemistry at Cajon Pool are characteristic of precipitation-derived water rather than groundwater; this site was removed from the monitoring rotation because it was not a good indicator of groundwater conditions. The water chemistry in both Square Tower Spring and Hackberry Pool changed significantly, but in opposite directions. Square Tower Spring had increasing total dissolved solids (TDS) and specific conductance, with all major ions showing increases over time. Hackberry Pool had decreases in TDS and most major ions through 2010, when water-chemistry lab analyses were suspended due to logistical constraints. Specific conductance continued to decrease at Hackberry Pool through 2021. The reasons for these changes are unknown. Increases in major ions at Square Tower Spring are unlikely to be related to oil and gas development in the region. Decreases in major ions at Hackberry Pool may reflect an increase in the amount of water that is entering the pool from rain and snowmelt rather than groundwater at this site. Water-quality parameters at Goodman Point Spring have remained stable. While the causes of trends in water chemistry at these sites are likely natural, the small quantities of water and harsh water-quality conditions make these sites poor habitat for aquatic life. Groundwater is naturally low in dissolved oxygen—but the dissolved-oxygen concentrations in the two pools are persistently low, sometimes falling to near zero in the summer. Water temperatures also warm in conjunction with air temperatures, with temperatures as warm as 18°C in the pools and 19°C in Goodman Point Spring. Traditionally, Puebloan cultures would have managed these small water resources to promote infiltration and retention of precipitation and to remove sediment and debris. Decreases in flow and increasing vegetation stress are likely tied to increasing air temperatures and long-term drought conditions across the region. The namesake hackberry trees at Hackberry Pool and nearby sites have shown increasing drought stress. Regionally, the underlying Dakota aquifer that feeds springs at the monument was relatively stable from 2008 to 2017, with decreasing levels from 2018 to 2021. Overall, the most concerning trends observed at springs in Hovenweep NM are likely due to climate change. Increasing air temperature threatens springflow and spring-associated vegetation through increased evapotranspiration. While pool levels have increased, recent decreases in the regional Dakota aquifer raise concerns about the stability of pools in the future. Managers could consider the potential benefits and risks of: Prioritizing protections and actions at Square Tower Spring, which has been the most resilient site at the monument in persistence of surface water and vegetation health during extreme drought. Implementing potential climate-adaptation actions that could improve groundwater infiltration upgradient of spring sites. This could include rehabilitating traditional structures to slow the flow of surface water. Implementing traditional management techniques that could increase dissolved-oxygen concentrations in the spring pools. Increasing invasive-plant removal efforts at Goodman Point Spring, which had the greatest number and cover of invasive-plant species of the three currently monitored locations. Developing interpretive stories about water-management techniques and the role of climate change in creating drought stress on iconic hackberry trees.