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Articles de revues sur le sujet « Critical scale regime »

Auteur : Grafiati

Publié le 2 juin 2025

Mis à jour le 31 juillet 2025

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1

Mei, Huan, Kunshan Li, Qian Liu, Bin Wang, and Xiangbai Wu. "Interaction of a Hysteresis Western Boundary Current with a Large-Scale Marginal Sea Circulation in a Gap-Leaping System." Journal of Physical Oceanography 53, no. 3 (2023): 943–57. http://dx.doi.org/10.1175/jpo-d-22-0194.1.

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Abstract The influence of a large-scale circulation (LSC) in a marginal sea on a hysteresis western boundary current (WBC) flowing across a gap is studied using a nonlinear 1.5-layer ocean model. Results show that both single-gyre LSC and double-gyre LSC are able to induce the critical-state WBC transition from the eddy-shedding regime to the leaping regime, while only double-gyre LSC is able to induce the critical-state WBC transition from the leaping regime to the eddy-shedding regime. The dynamics of WBC transition suggests that the meridional advection enhanced by the perturbation of the L

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Dhara, S., and R. v. d. Hofstad. "Barely Supercritical Percolation on Poissonian Scale-free Networks." Markov Processes And Related Fields, no. 2024 №1 (30) (May 27, 2024): 27–55. http://dx.doi.org/10.61102/1024-2953-mprf.2024.30.1.001.

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We study the giant component problem slightly above the critical regime for percolation on Poissonian random graphs in the scale-free regime, where the vertex weights and degrees have a diverging second moment. Critical percolation on scale-free random graphs has been observed to have incredibly subtle features that are markedly different compared to those in random graphs with a converging second moment. In particular, the critical window for percolation depends sensitively on whether we consider single- or multi-edge versions of the Poissonian random graph. In this paper, and together with o

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Jin, Xin, Hai Wang, and Caixin Feng. "Space Charge Effect and Resistance Switching in Doped Monocrystalline Silicones." Applied Sciences 9, no. 3 (2019): 434. http://dx.doi.org/10.3390/app9030434.

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In this work, we report the nonlinear carriers’ transport in n-doped monocrystalline silicone with millimeter-scale length. Ohm, effective trap filling, and Mott–Gurney regimes are distinguished from the current–voltage (I–V) curve. Two critical voltages are identified for the lower and upper limitations of an effective trap-filling regime. Meanwhile, the electrode spacing, temperature, and magnetic field dependence of the two critical voltages are demonstrated experimentally. In particular, we propose that the effective trap-filling process is irreversible under electric field. It is observed

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Mauritsen, Thorsten, and Gunilla Svensson. "Observations of Stably Stratified Shear-Driven Atmospheric Turbulence at Low and High Richardson Numbers." Journal of the Atmospheric Sciences 64, no. 2 (2007): 645–55. http://dx.doi.org/10.1175/jas3856.1.

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Abstract Stably stratified shear-driven turbulence is analyzed using the gradient Richardson number, Ri, as the stability parameter. The method overcomes the statistical problems associated with the widely used Monin–Obukhov stability parameter. The results of the Ri-based scaling confirm the presence of three regimes: the weakly and the very stable regimes and the transition in between them. In the weakly stable regime, fluxes scale in proportion with variance, while in the very stable regime, stress and scalar fluxes behave differently. At large Ri, the velocity field becomes highly anisotro

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Zanchi, D. "Angle-resolved study of density waves, superconductivity and pseudogap in two dimensions." Journal de Physique IV 12, no. 9 (2002): 65–68. http://dx.doi.org/10.1051/jp4:20020356.

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Weakly correlated electrons on a square lattice are studied by angle-resolved functional renormalization group. Upon renormalization the interaction starts to depend on monienta and has pole-like solutions near the doping-dependent critical scale. Near half-filling this critical scale is the pseudogap temperature T*. In the overdoped regime the critical scale is the mean-field like critical temperature for d-wave superconductivity.

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Tjernström, Michael, Ben B. Balsley, Gunilla Svensson, and Carmen J. Nappo. "The Effects of Critical Layers on Residual Layer Turbulence." Journal of the Atmospheric Sciences 66, no. 2 (2009): 468–80. http://dx.doi.org/10.1175/2008jas2729.1.

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Abstract The authors report results of a study of finescale turbulence structure in the portion of the nocturnal boundary layer known as the residual layer (RL). The study covers two nights during the Cooperative Atmosphere–Surface Exchange Study 1999 (CASES-99) field experiment that exhibit significant differences in turbulence, as indicated by the observed turbulence dissipation rates in the RL. The RL turbulence sometimes reaches intensities comparable to those in the underlying stable boundary layer. The commonly accepted concept of turbulence generation below critical values of the gradie

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Grandey, B. S., and P. Stier. "A critical look at spatial scale choices in satellite-based aerosol indirect effect studies." Atmospheric Chemistry and Physics 10, no. 23 (2010): 11459–70. http://dx.doi.org/10.5194/acp-10-11459-2010.

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Abstract. Analysing satellite datasets over large regions may introduce spurious relationships between aerosol and cloud properties due to spatial variations in aerosol type, cloud regime and synoptic regime climatologies. Using MODerate resolution Imaging Spectroradiometer data, we calculate relationships between aerosol optical depth τa derived liquid cloud droplet effective number concentration Ne and liquid cloud droplet effective radius re at different spatial scales. Generally, positive values of dlnNedlnτa are found for ocean regions, whilst negative values occur for many land regions.

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Cheng, Edmund W. "Street Politics in a Hybrid Regime: The Diffusion of Political Activism in Post-colonial Hong Kong." China Quarterly 226 (May 26, 2016): 383–406. http://dx.doi.org/10.1017/s0305741016000394.

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AbstractThis paper examines the diffusion of activism in post-colonial Hong Kong through the lens of the political regime and eventful analysis. It first reveals the institutional foundations of the hybrid regime that allowed the creation of a nascent movement society. It then explains how the historic 1 July rally in 2003 and a series of critical events since 2006 have led to a shift in scale and the public staging of street politics. A time-series analysis and onsite survey further capture the dynamics that spawned the collective recognition of grievances and reduced participation costs, lea

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Ménesguen, Claire, J. C. McWilliams, and M. J. Molemaker. "Ageostrophic instability in a rotating stratified interior jet." Journal of Fluid Mechanics 711 (September 28, 2012): 599–619. http://dx.doi.org/10.1017/jfm.2012.412.

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AbstractOceanic large- and meso-scale flows are nearly balanced in forces between Earth’s rotation and density stratification effects (i.e. geostrophic, hydrostatic balance associated with small Rossby and Froude numbers). In this regime advective cross-scale interactions mostly drive energy toward larger scales (i.e. inverse cascade). However, viscous energy dissipation occurs at small scales. So how does the energy reservoir at larger scales leak toward small-scale dissipation to arrive at climate equilibrium? Here we solve the linear instability problem of a balanced flow in a rotating and

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Grandey, B. S., and P. Stier. "A critical look at spatial scale choices in satellite-based aerosol indirect effect studies." Atmospheric Chemistry and Physics Discussions 10, no. 6 (2010): 15417–40. http://dx.doi.org/10.5194/acpd-10-15417-2010.

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Abstract. Analysing satellite datasets over large regions may introduce spurious relationships between aerosol and cloud properties due to spatial variations in aerosol type, cloud regime and synoptic regime climatologies. Using MODerate resolution Imaging Spectroradiometer data, we calculate relationships between aerosol optical depth τa, derived liquid cloud droplet effective number concentration Ne and liquid cloud droplet effective radius re at different spatial scales. Generally, positive values of dlnNe dlnτa are found for ocean regions, whilst negative values occur for many land regions

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Gallet, Basile, and Raffaele Ferrari. "The vortex gas scaling regime of baroclinic turbulence." Proceedings of the National Academy of Sciences 117, no. 9 (2020): 4491–97. http://dx.doi.org/10.1073/pnas.1916272117.

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The mean state of the atmosphere and ocean is set through a balance between external forcing (radiation, winds, heat and freshwater fluxes) and the emergent turbulence, which transfers energy to dissipative structures. The forcing gives rise to jets in the atmosphere and currents in the ocean, which spontaneously develop turbulent eddies through the baroclinic instability. A critical step in the development of a theory of climate is to properly include the eddy-induced turbulent transport of properties like heat, moisture, and carbon. In the linear stages, baroclinic instability generates flow

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Agostini, Luca. "Influence of reciprocal links on the dynamics of scale-free Boolean networks." International Journal of Modern Physics C 31, no. 03 (2020): 2050040. http://dx.doi.org/10.1142/s0129183120500400.

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We study the effects of the reciprocal links on the dynamics of direct Boolean networks with scale-free topology (SFRBNs). By means of the method of the Derrida Plot, we have investigated the SFRBNs characterized by different values of average degree and different values of reciprocity in order to test the behavioral regimes of the system. The following step was to perform numerical simulation with the quenched Kauffman model to study the dynamical properties of critical SFRBNs with [Formula: see text]. The distribution of the number of different attractors, the period of the cyclic attractors

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Deng, Na, Antoine Wautier, Yannick Thiery, Zhen-Yu Yin, Pierre-Yves Hicher, and François Nicot. "Dynamic view of critical state regime in granular materials: a mesoscale perspective." EPJ Web of Conferences 249 (2021): 11011. http://dx.doi.org/10.1051/epjconf/202124911011.

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We revisit the Critical State (CS) in a dynamic perspective at a mesoscopic scale to enrich the classical view of the critical state as a steady state. The dynamics of meso-structures has been characterized by recording generating and vanishing processes in discrete element simulations. Our results suggest that meso-structures have a short but regular lifespan at critical state along a biaxial compression loading path.

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Rocha, Juan C., Garry Peterson, Örjan Bodin, and Simon Levin. "Cascading regime shifts within and across scales." Science 362, no. 6421 (2018): 1379–83. http://dx.doi.org/10.1126/science.aat7850.

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Regime shifts are large, abrupt, and persistent critical transitions in the function and structure of ecosystems. Yet, it is unknown how these transitions will interact, whether the occurrence of one will increase the likelihood of another or simply correlate at distant places. We explored two types of cascading effects: Domino effects create one-way dependencies, whereas hidden feedbacks produce two-way interactions. We compare them with the control case of driver sharing, which can induce correlations. Using 30 regime shifts described as networks, we show that 45% of regime shift pairwise co

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Williams, Owen, Tristen Hohman, Tyler Van Buren, Elie Bou-Zeid, and Alexander J. Smits. "The effect of stable thermal stratification on turbulent boundary layer statistics." Journal of Fluid Mechanics 812 (January 11, 2017): 1039–75. http://dx.doi.org/10.1017/jfm.2016.781.

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The effects of stable thermal stratification on turbulent boundary layers are experimentally investigated for smooth and rough walls. For weak to moderate stability, the turbulent stresses are seen to scale with the wall shear stress, compensating for changes in fluid density in the same manner as done for compressible flows. This suggests little change in turbulent structure within this regime. At higher levels of stratification turbulence no longer scales with the wall shear stress and turbulent production by mean shear collapses, but without the preferential damping of near-wall motions obs

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Yamada, H., I. Manas-Zloczower, and D. L. Feke. "The Influence of Matrix Viscosity and Interfacial Properties on the Dispersion Kinetics of Carbon Black Agglomerates." Rubber Chemistry and Technology 71, no. 1 (1998): 1–16. http://dx.doi.org/10.5254/1.3538468.

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Abstract The dispersion of carbon black agglomerates suspended in polydimethyl siloxane (PDMS) or polybutadiene (PBD) liquids has been studied. Agglomerates comprised of either a low-structure or a high-structure carbon-black were subjected to simple shear flow. Two characteristic length scales that affect the dispersion process are identified. One length scale (Lp) is a measure of the ease with which fluid can flow through the porous agglomerate structure. The second (δ) is a measure of the depth to which processing fluid has soaked into the agglomerate. Values of Lp were found to be independ

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Avram, F., A. J. E. M. Janssen, and J. S. H. Van Leeuwaarden. "Loss Systems with Slow Retrials in the Halfin–Whitt Regime." Advances in Applied Probability 45, no. 1 (2013): 274–94. http://dx.doi.org/10.1239/aap/1363354111.

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The Halfin–Whitt regime, or the quality-and-efficiency-driven (QED) regime, for multiserver systems refers to a situation with many servers, a critical load, and yet favorable system performance. We apply this regime to the classical multiserver loss system with slow retrials. We derive nondegenerate limiting expressions for the main steady-state performance measures, including the retrial rate and the blocking probability. It is shown that the economies of scale associated with the QED regime persist for systems with retrials, although in situations when the load becomes extremely critical th

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Avram, F., A. J. E. M. Janssen, and J. S. H. Van Leeuwaarden. "Loss Systems with Slow Retrials in the Halfin–Whitt Regime." Advances in Applied Probability 45, no. 01 (2013): 274–94. http://dx.doi.org/10.1017/s0001867800006273.

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The Halfin–Whitt regime, or the quality-and-efficiency-driven (QED) regime, for multiserver systems refers to a situation with many servers, a critical load, and yet favorable system performance. We apply this regime to the classical multiserver loss system with slow retrials. We derive nondegenerate limiting expressions for the main steady-state performance measures, including the retrial rate and the blocking probability. It is shown that the economies of scale associated with the QED regime persist for systems with retrials, although in situations when the load becomes extremely critical th

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LEE, KYOUNG EUN, and JAE WOO LEE. "AVALANCHES OF BAK–SNEPPEN COEVOLUTION MODEL ON DIRECTED SCALE-FREE NETWORK." Fractals 17, no. 02 (2009): 233–37. http://dx.doi.org/10.1142/s0218348x09004259.

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We study the critical properties of the Bak–Sneppen coevolution model on scale-free networks by Monte Carlo method. We report the distribution of the avalanche size and fractal activity through the branching process. We observe that the critical fitness fc(N) depends on the number of the node such as fc(N) ~ 1/ log (N) for both the scale-free network and the directed scale-free network. Near the critical fitness many physical quantities show power-law behaviors. The probability distribution P(s) of the avalanche size at the critical fitness shows a power-law like P(s) ~ s-τ with τ = 1.53(5) re

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Bellucci, A., S. Gualdi, and A. Navarra. "The Double-ITCZ Syndrome in Coupled General Circulation Models: The Role of Large-Scale Vertical Circulation Regimes." Journal of Climate 23, no. 5 (2010): 1127–45. http://dx.doi.org/10.1175/2009jcli3002.1.

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Abstract The double–intertropical convergence zone (DI) systematic error, affecting state-of-the-art coupled general circulation models (CGCMs), is examined in the multimodel Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) ensemble of simulations of the twentieth-century climate. The aim of this study is to quantify the DI error on precipitation in the tropical Pacific, with a specific focus on the relationship between the DI error and the representation of large-scale vertical circulation regimes in climate models. The DI rainfall signal is analyzed using a reg

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Kaiser, Amandine, Davide Faranda, Sebastian Krumscheid, Danijel Belušić, and Nikki Vercauteren. "Detecting Regime Transitions of the Nocturnal and Polar Near-Surface Temperature Inversion." Journal of the Atmospheric Sciences 77, no. 8 (2020): 2921–40. http://dx.doi.org/10.1175/jas-d-19-0287.1.

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Abstract Many natural systems undergo critical transitions, i.e., sudden shifts from one dynamical regime to another. In the climate system, the atmospheric boundary layer can experience sudden transitions between fully turbulent states and quiescent, quasi-laminar states. Such rapid transitions are observed in polar regions or at night when the atmospheric boundary layer is stably stratified, and they have important consequences in the strength of mixing with the higher levels of the atmosphere. To analyze the stable boundary layer, many approaches rely on the identification of regimes that a

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Dicorato, M., M. Muraglia, Y. Camenen, et al. "Gyrokinetic Stability Analysis of JET Pedestal Top Plasmas with Small-ELMs." Journal of Physics: Conference Series 2397, no. 1 (2022): 012007. http://dx.doi.org/10.1088/1742-6596/2397/1/012007.

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Abstract In recent years, a strong effort has been dedicated to the development of tokamak plasma regimes alternative to the standard high confinement mode (H-mode) with type-I edge localized mode (ELM), i.e. ELM-free and small-ELM regimes, given the associated hardly sustainable energy and particle fluxes on plasma facing components. In this work, we will focus on new H-mode regimes with small-ELMs, the so-called baseline small-ELMs (BSE), characterized by high thermal confinement and low core impurity accumulation, which have been recently found at JET. In order to characterize the micro-tur

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Privezencev, Aleksej, and Gennadij Fomenko. "Complex dynamics of the charged-particle beam with virtual cathode." Izvestiya VUZ. Applied Nonlinear Dynamics 2, no. 3 (1994): 56–68. https://doi.org/10.18500/0869-6632-1994-2-5-56-68.

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This paper presents numerical analysis of nonlinear virtual cathode dynamics in triode systems. It was found that different stationary unstable flow states transform into different oscillation regimes - nonlinear structures for a certain injection current range near the critical value. Further it was found that injected current perturbations cause interactions of the nonlinear structures and high-frequency mode is absorbed by lowfrequency one. When the flow interacts with multimode cavity at the certain beam coupling level and at the range of eigenmode frequencies a frequency locking regime is

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Lai, Yi-Huei, and Jiun-Jih Miau. "An investigation into the nonstationary characteristics of separation-bubble formation on a smooth circular cylinder in the critical transition range." Journal of Mechanics 37 (2021): 415–31. http://dx.doi.org/10.1093/jom/ufab011.

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Abstract To investigate the characteristics of the separation-bubble formation of flow over a smooth circular cylinder in the critical transition range, a sliding-window (SW) method and a peak-valley (PV) method were proposed to identify the intermittent jumps, named the characteristic events, in the real-time pressure signal obtained on both sides of the cylinder model. By evaluating the counts of the qualified events of the SW and PV methods, the PV method was found less sensitive to the small-scale disturbances in the pressure signal, therefore was adopted for later analysis. With the PV me

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Luo, Jianbin, Ping Huang, Shizhu Wen, and Lawrence K. Y. Li. "Characteristics of Liquid Lubricant Films at the Nano-Scale." Journal of Tribology 121, no. 4 (1999): 872–78. http://dx.doi.org/10.1115/1.2834149.

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Characteristics of a liquid lubricant film at the nanometer scale are discussed in the present paper. The variations of the film thickness in a central contact region between a glass disk and a super-polished steel ball with lubricant viscosity, rolling speed, substrate surface tension, running time, load, etc. have been investigated. Experimental results show that the variation of film thickness in the thin film lubrication (TFL) regime is largely different from that in the elastohydrodynamic lubrication (EHL) regime. The critical transition point from EHL to TFL is closely related to lubrica

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Garza-Díaz, Laura E., and Samuel Sandoval-Solis. "Identifying Thresholds, Regime Shifts, and Early Warning Signals Using Long-Term Streamflow Data in the Transboundary Rio Grande–Rio Bravo Basin." Water 14, no. 16 (2022): 2555. http://dx.doi.org/10.3390/w14162555.

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As the centerpiece of ecosystems and human societies, river basins are complex social–ecological systems (SESs) that depend on the natural flow regime and the hydrologic variability to adapt to changes and absorb disturbances. Anthropogenic and climate change disturbances destabilize river systems. Therefore, a resilience question arises: What is the carrying capacity of a river basin, i.e., how much disturbance can a river basin take until the system undergoes a regime shift? To answer this question, this study aims to identify regime shifts, thresholds, and the carrying capacity of the trans

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Loch, R. A., T. Ceccotti, F. Quéré, et al. "Ion acceleration in the transparent regime and the critical influence of the plasma density scale length." Physics of Plasmas 23, no. 9 (2016): 093117. http://dx.doi.org/10.1063/1.4962571.

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Curic, Davor, Victorita E. Ivan, David T. Cuesta, et al. "Deconstructing scale-free neuronal avalanches: behavioral transitions and neuronal response." Journal of Physics: Complexity 2, no. 4 (2021): 045010. http://dx.doi.org/10.1088/2632-072x/ac35b4.

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Abstract Observations of neurons in a resting brain and neurons in cultures often display spontaneous scale-free (SF) collective dynamics in the form of information cascades, also called ‘neuronal avalanches’. This has motivated the so called critical brain hypothesis which posits that the brain is self-tuned to a critical point or regime, separating exponentially-growing dynamics from quiescent states, to achieve optimality. Yet, how such optimality of information transmission is related to behavior and whether it persists under behavioral transitions has remained a fundamental knowledge gap.

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Bandara, Chaminda S., and Ranjith Dissanayake. "The Impact of the Gigacycle Fatigue on Steel Bridges." Key Engineering Materials 569-570 (July 2013): 246–53. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.246.

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Recent studies have proved that there is no fatigue limit for metallic materials; the stress life curve continuously drops even after 107cycles. However, existing design codes assume that there is a fatigue limit. Therefore, it is important to use appropriate safety factors if existing codes are used for life evaluations. This paper first describes a method to extend high cycle fatigue stress life curves which are developed using tests on small scale specimens, to the gigacycle regime. Then the difference between the stress life curves of small scale specimens and full scale tests related to s

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Huneke, Wilma G. C., Adele K. Morrison, and Andrew McC Hogg. "Spatial and Subannual Variability of the Antarctic Slope Current in an Eddying Ocean–Sea Ice Model." Journal of Physical Oceanography 52, no. 3 (2022): 347–61. http://dx.doi.org/10.1175/jpo-d-21-0143.1.

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Abstract The Antarctic Slope Current (ASC) circumnavigates the Antarctic continent following the continental slope and separating the waters on the continental shelf from the deeper offshore Southern Ocean. Water mass exchanges across the continental slope are critical for the global climate as they impact the global overturning circulation and the mass balance of the Antarctic ice sheet via basal melting. Despite the ASC’s global importance, little is known about its spatial and subannual variability, as direct measurements of the velocity field are sparse. Here, we describe the ASC in a glob

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Shang, Guanyu, Zhuochao Wang, Haoyu Li, et al. "Metasurface Holography in the Microwave Regime." Photonics 8, no. 5 (2021): 135. http://dx.doi.org/10.3390/photonics8050135.

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Hologram technology has attracted a great deal of interest in a wide range of optical fields owing to its potential use in future optical applications, such as holographic imaging and optical data storage. Although there have been considerable efforts to develop holographic technologies using conventional optics, critical issues still hinder their future development. A metasurface, as an emerging multifunctional device, can manipulate the phase, magnitude, polarization and resonance properties of electromagnetic fields within a sub-wavelength scale, opening up an alternative for a compact holo

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Dyussenov, Mergen. "The Role of ICT in Addressing Corruption Across Political Regimes." Otoritas : Jurnal Ilmu Pemerintahan 9, no. 1 (2019): 42–55. http://dx.doi.org/10.26618/ojip.v9i1.1508.

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The paper reviews existing literature on the role of the internet in addressing corruption by breaking it down into instrumental, important, and critical roles, across two types of political regimes – (semi-)authoritarian and democracies. It analyzes the key resources and strategies utilized by governments and activists across these regimes, and looks into the common themes that emerge as a result of analyzing literature sources, i.e. the notion of crisis, lack of a single accepted definition of corruption across nations, factors found to positively correlate with reduced corruption, and the e

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Willis, Ann D., Ryan A. Peek, and Andrew L. Rypel. "Classifying California’s stream thermal regimes for cold-water conservation." PLOS ONE 16, no. 8 (2021): e0256286. http://dx.doi.org/10.1371/journal.pone.0256286.

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Stream temperature science and management is rapidly shifting from single-metric driven approaches to multi-metric, thermal regime characterizations of streamscapes. Given considerable investments in recovery of cold-water fisheries (e.g., Pacific salmon and other declining native species), understanding where cold water is likely to persist, and how cold-water thermal regimes vary, is critical for conservation. California’s unique position at the southern end of cold-water ecosystems in the northern hemisphere, variable geography and hydrology, and extensive flow regulation requires a systema

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Travaglino, Riccardo, and Alessio Zaccone. "Analytical theory of enhanced Bose–Einstein condensation in thin films." Journal of Physics B: Atomic, Molecular and Optical Physics 55, no. 5 (2022): 055301. http://dx.doi.org/10.1088/1361-6455/ac5583.

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Abstract We present an analytically solvable theory of Bose–Einstein condensation (BEC) in thin film geometries. Analytical closed-form expressions for the critical temperature are obtained in both the low-to-moderate confinement regime (where the film thickness L is in the order of microns) as well as in the strong confinement regime where the thickness is in the order of few nanometers or lower. The possibility of high-temperature BEC is predicted in the strong confinement limit, with a square-root divergence of the critical temperature T c ∼ L −1/2. For cold Bose gases, this implies an enha

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Kolchanova, Ekaterina A., and Nikolay V. Kolchanov. "Passive convective ventilation in a double air-porous layer with internal heat generation depending on solid fraction." Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, no. 82 (2023): 108–19. http://dx.doi.org/10.17223/19988621/82/9.

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The convective stability of a two-layered system consisting of a heat-generating porous region underlying an air region has been numerically studied. The linear dependence of the heat release on the solid volume fraction is taken into account in the porous region. The equal constant temperature values are fixed on the external impermeable boundaries of the system. The critical internal Rayleigh-Darcy number at which the convection is induced in the system in the form of two-dimensional roll patterns with a given wave number has been determined. The convective flow is possible due to the format

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Champion, Yannick, Cyril Langlois, Sandrine Guérin, Sylvie Lartigue-Korinek, P. Langlois, and Martin J. Hÿtch. "Plasticity of Copper with Small Grain Size." Materials Science Forum 482 (April 2005): 71–76. http://dx.doi.org/10.4028/www.scientific.net/msf.482.71.

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Based on the Taylor theory, a critical length scale is defined as the minimum dislocations cell size obtained at the maximum work-hardening for metals and alloys. When grain size is smaller than this length scale, corresponding also to a critical dislocation mean free path, new behaviours occur; such as ductility and strength, near perfect elasto-plasticity, high strain-rate sensitivity. Bulk samples are fabricated from Cu nanopowders (particle size 50 nm) by powder metallurgy techniques. The final grain size is comprised between the critical mean free path, evaluated at 130 nm and the size wh

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Bougouin, A., L. Lacaze, and T. Bonometti. "Collapse of a neutrally buoyant suspension column: from Newtonian to apparent non-Newtonian flow regimes." Journal of Fluid Mechanics 826 (August 15, 2017): 918–41. http://dx.doi.org/10.1017/jfm.2017.471.

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Experiments on the collapse of non-colloidal and neutrally buoyant particles suspended in a Newtonian fluid column are presented, in which the initial volume fraction of the suspension $\unicode[STIX]{x1D719}$, the viscosity of the interstitial fluid $\unicode[STIX]{x1D707}_{f}$, the diameter of the particles $d$ and the mixing protocol, i.e. the initial preparation of the suspension, are varied. The temporal evolution of the slumping current highlights two main regimes: (i) an inertial-dominated regime followed by (ii) a viscous-dominated regime. The inertial regime is characterized by a cons

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Gorlova, D. A., I. N. Tsymbalov, I. P. Tsygvintsev, and A. B. Savelev. "THz transition radiation of electron bunches laser-accelerated in long-scale near-critical-density plasmas." Laser Physics Letters 21, no. 3 (2024): 035001. http://dx.doi.org/10.1088/1612-202x/ad21ed.

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Abstract Direct laser electron acceleration in near-critical density plasma produces collimated electron beams with high charge Q (up to µC). This regime could be of interest for high-energy THz radiation generation, as many of the mechanisms have a scaling ∝ Q 2 . In this work, we focus specifically on the challenges that arise during numerical investigations of transition radiation in such interactions. Detailed analytical calculations that include both the diffraction and decoherence effects of the characteristics of transition radiation in the THz range were conducted with the input parame

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Betancur, John J. "Gentrification in Latin America: Overview and Critical Analysis." Urban Studies Research 2014 (February 17, 2014): 1–14. http://dx.doi.org/10.1155/2014/986961.

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This paper offers a critical review and interpretation of gentrification in Latin American cities. Applying a flexible methodology, it examines enabling conditions associated with societal regime change and local contingencies to determine its presence, nature, extent, and possibilities. Questioning the uncritical transfer of constructs such as gentrification from the Global North to the Global South, the paper advocates analyses of mediating structures and local conditions to determine their applicability and possible variations. Overall, the review questions the feasibility of self-sustained

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H, Ullah, Andleeb F, and Hussain F. "Fundamentals of optical coherence tomography: a critical review." Physics & Astronomy International Journal 2, no. 1 (2018): 59–62. http://dx.doi.org/10.15406/paij.2018.02.00049.

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The main objective of this work is to go through fundamentals, mechanism and types of the state of the art emerging imaging modality i.e. optical coherence tomography (OCT) for non-invasive 3D imaging of bio tissues. This work consists of literature studied critically for OCT’s contribution in axial scanning of bio tissues with it different types to the best of our knowledge. Doppler optical coherence tomography (D-OCT) and speckle variance optical coherence tomography (SV-OCT) for blood flow assessment and blood microvasculatures on micron-scale resolution with dorsal skin-fold window chamber

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Kocharyan, G. G., A. A. Ostapchuk, D. V. Pavlov, et al. "Laboratory Study on Frictional Behavior of Rock Blocks of Meter Scale. Methods and Preliminary Results." Izvestiya, Physics of the Solid Earth 58, no. 6 (2022): 929–40. http://dx.doi.org/10.1134/s1069351322060064.

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Abstract—The paper introduces a new, unique for Russia, meter-scale laboratory setup created in the Institute of Geosphere Dynamics of the Russian Academy of Sciences (IDG RAS) to study the development of different sliding regimes on rock discontinuities. The experimental procedure is described and the results of the first series of tests aimed at studying the formation of different sliding regimes on rock faults are presented. The laboratory fault was a loaded contact of two 75-cm long blocks made of diabase. The fault was filled with granular material (a fault gouge). Normal stresses on the

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TADIĆ, BOSILJKA, G. J. RODGERS, and STEFAN THURNER. "TRANSPORT ON COMPLEX NETWORKS: FLOW, JAMMING AND OPTIMIZATION." International Journal of Bifurcation and Chaos 17, no. 07 (2007): 2363–85. http://dx.doi.org/10.1142/s0218127407018452.

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Many transport processes on networks depend crucially on the underlying network geometry, although the exact relationship between the structure of the network and the properties of transport processes remain elusive. In this paper, we address this question by using numerical models in which both structure and dynamics are controlled systematically. We consider the traffic of information packets that include driving, searching and queuing. We present the results of extensive simulations on two classes of networks; a correlated cyclic scale-free network and an uncorrelated homogeneous weakly clu

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Desgué-Itier, Olivia, Laura Melo Vieira Soares, Orlane Anneville, et al. "Past and future climate change effects on the thermal regime and oxygen solubility of four peri-alpine lakes." Hydrology and Earth System Sciences 27, no. 3 (2023): 837–59. http://dx.doi.org/10.5194/hess-27-837-2023.

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Abstract. Long-term effects of climate change on lakes globally will include a substantial modification in the thermal regime and the oxygen solubility of lakes, resulting in the alteration of ecosystem processes, habitats, and concentrations of critical substances. Recent efforts have led to the development of long-term model projections of climate change effects on lake thermal regimes and oxygen solubility. However, such projections are hardly ever confronted with observations extending over multiple decades. Furthermore, global-scale forcing parameters in lake models present several limita

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TIMOSHIN, S. N., and F. T. SMITH. "Vortex/inflectional-wave interactions with weakly three-dimensional input." Journal of Fluid Mechanics 348 (October 10, 1997): 247–94. http://dx.doi.org/10.1017/s0022112097006447.

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The subtle impact of the spanwise scaling in nonlinear interactions between oblique instability waves and the induced longitudinal vortex field is considered theoretically for the case of a Rayleigh-unstable boundary-layer flow, at large Reynolds numbers. A classification is given of various flow regimes on the basis of Reynolds-stress mechanisms of mean vorticity generation, and a connection between low-amplitude non-parallel vortex/wave interactions and less-low-amplitude non-equilibrium critical-layer flows is discussed in more detail than in previous studies. Two new regimes of vortex/wave

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Ketcheson, Scott J., and Jonathan S. Price. "Comparison of the hydrological role of two reclaimed slopes of different ages in the Athabasca oil sands region, Alberta, Canada." Canadian Geotechnical Journal 53, no. 9 (2016): 1533–46. http://dx.doi.org/10.1139/cgj-2015-0391.

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Establishing hydrological connectivity in reconstructed landscapes, and understanding how this connectivity evolves over time, is critical for the development of effective water management strategies after oil sands extraction. In the current study, the dominant controls on the soil water regimes and runoff generation mechanisms on two contrasting reclaimed slopes (2 and 6 years after reclamation) in the Athabasca oil sands region are investigated. The most recently reclaimed slope demonstrated a hydrologic regime with limited soil water storage due to a low surface infiltration capacity that

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Edwards, Andrew C., and Jeremy Russell-Smith. "Ecological thresholds and the status of fire-sensitive vegetation in western Arnhem Land, northern Australia: implications for management." International Journal of Wildland Fire 18, no. 2 (2009): 127. http://dx.doi.org/10.1071/wf08008.

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The paper examines the application of the ecological thresholds concept to fire management issues concerning fire-sensitive vegetation types associated with the remote, biodiversity-rich, sandstone Arnhem Plateau, in western Arnhem Land, monsoonal northern Australia. In the absence of detailed assessments of fire regime impacts on component biota such as exist for adjoining Nitmiluk and World Heritage Kakadu National Parks, the paper builds on validated 16-year fire history and vegetation structural mapping products derived principally from Landsat-scale imagery, to apply critical ecological t

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Zhu, Hongkun, Qinghe Yao, and Hiroshi Kanayama. "Large-Scale Computations of Flow around Two Cylinders by a Domain Decomposition Method." Mathematical Problems in Engineering 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/4126123.

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A parallel computation is applied to study the flow past a pair of cylinders in tandem at Reynolds numbers of 1000 by Domain Decomposition Method. The computations were carried out for different sets of arrangements at large scale. The modeling by domain decomposition was validated by comparing available well-recognized results. Two cylinders with different diameters were further investigated; for different diameter ratios, the wake width ratio and some properties of the critical space ratio that dominates the flow regime were discovered. This result has important implications on future indust

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Wetzel, Maria, Thomas Kempka, and Michael Kühn. "Hysteresis in permeability evolution simulated for a sandstone by mineral precipitation and dissolution." Advances in Geosciences 58 (October 11, 2022): 1–10. http://dx.doi.org/10.5194/adgeo-58-1-2022.

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Abstract. Mineral dissolution and precipitation can substantially affect rock permeability, which is a critical parameter for a broad range of geological subsurface applications. Virtual experiments on digital pore-scale samples represent a powerful and flexible approach to understand the impact of microstructural alterations on evolving hydraulic rock behaviour and quantify trends in permeability. In the present study, porosity-permeability relations are simulated for a precipitation-dissolution cycle within a typical reservoir sandstone. A hysteresis in permeability is observed depending on

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Monville, R., J. Vidal, D. Cébron, and N. Schaeffer. "Rotating double-diffusive convection in stably stratified planetary cores." Geophysical Journal International 219, Supplement_1 (2019): S195—S218. http://dx.doi.org/10.1093/gji/ggz347.

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SUMMARY In planetary fluid cores, the density depends on temperature and chemical composition, which diffuse at very different rates. This leads to various instabilities, bearing the name of double-diffusive convection (DDC). We investigate rotating DDC (RDDC) in fluid spheres. We use the Boussinesq approximation with homogeneous internal thermal and compositional source terms. We focus on the finger regime, in which the thermal gradient is stabilizing whereas the compositional one is destabilizing. First, we perform a global linear stability analysis in spheres. The critical Rayleigh numbers

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Lukianenko, Iryna, Mariia Nasachenko, and Taras Tokarchuk. "ESTIMATING INFLATION AND INFLATION EXPECTATIONS BASED ON A MARKOV-SWITCHING VECTOR AUTOREGRESSION APPROACH: CASE OF UKRAINE." Financial and credit activity problems of theory and practice 3, no. 62 (2025): 163–74. https://doi.org/10.55643/fcaptp.3.62.2025.4724.

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This article examines the behaviour of inflation and inflation expectations in Ukraine under conditions of macroeconomic instability caused by the full-scale Russian-Ukrainian war. Using a Markov Switching Vector Autoregressive (MS-VAR) model, the study investigates regime-switching dynamics between high and low volatility periods from 2021 to 2024. The findings reveal a significantly longer duration of high-volatility regimes (averaging 4 months) compared to low-volatility regimes (1.4 months), reflecting the prolonged instability in the macroeconomic environment.The results highlight that in

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