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Journal articles on the topic 'Quasi-equilibrium combination'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

CHARAFI, MY M., A. SADOK, A. KAMAL, and A. MENAI. "QUASI-THREE-DIMENSIONAL MATHEMATICAL MODELING OF MORPHOLOGICAL PROCESSES BASED ON EQUILIBRIUM SEDIMENT TRANSPORT." International Journal of Modern Physics C 11, no. 07 (2000): 1425–36. http://dx.doi.org/10.1142/s0129183100001267.

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A quasi-three-dimensional mathematical model has been developed to study the morphological processes based on equilibrium sediment transport method. The flow velocities are computed by a two-dimensional horizontal depth-averaged flow model (H2D) in combination with logarithmic velocity profiles. The transport of sediment particles by a flow water has been considered in the form of bed load and suspended load. The bed load transport rate is defined as the transport of particles by rolling and saltating along the bed surface and is given by the Van Rijn relationship (1987). The equilibrium suspe

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Li, Gaobo. "A New Study on Halpern and Nonconvex Combination Algorithm for Nonlinear Mappings in Banach Spaces with Applications." Journal of Mathematics 2021 (January 28, 2021): 1–17. http://dx.doi.org/10.1155/2021/6674427.

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In this paper, we introduce a Halpern algorithm and a nonconvex combination algorithm to approximate a solution of the split common fixed problem of quasi- ϕ -nonexpansive mappings in Banach space. In our algorithms, the norm of linear bounded operator does not need to be known in advance. As the application, we solve a split equilibrium problem in Banach space. Finally, some numerical examples are given to illustrate the main results in this paper and compare the computed results with other ones in the literature. Our results extend and improve some recent ones in the literature.

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Özmen, Haluk, and Akbar Naseriazar. "Effect of simulations enhanced with conceptual change texts on university students’ understanding of chemical equilibrium." Journal of the Serbian Chemical Society 83, no. 1 (2018): 121–37. http://dx.doi.org/10.2298/jsc161222065o.

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The aim of this research was to investigate the effect of computer simulations enhanced with conceptual change texts (CS-CCT) on first year university students? understanding of chemical equilibrium. A quasi-experimental design and one control group (CG, N = 60) as well as one experimental group (EG, N = 65) were used in the study. While students in CG were taught with traditional methods based on textbooks and blackboard, the EG studied the same unit with CS-CCT. The chemical equilibrium concept test (CECT) was administered as pre-test, post-test and delayed test to collect data. The results

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De Laat, T. W. G., and R. Coene. "Two-dimensional vortex motion in the cross-flow of a wing-body configuration." Journal of Fluid Mechanics 305 (December 25, 1995): 93–109. http://dx.doi.org/10.1017/s0022112095004551.

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For a two-dimensional potential flow, Föppl obtained the equilibrium positions for a symmetric vortex pair behind a circular cylinder in a uniform oncoming flow. In this article it is shown that such an equilibrium is in general possible for a vortex in a stagnation flow (e. g. in a corner). Furthermore it is found that a vortex near such an equilibrium position will rotate with a definite frequency around this equilibrium. Expressions are derived for the frequencies associated with the closed orbits of the vortices in the case of equilibrium of a vortex in a stagnation flow and for the equili

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Liu, Haodong, Xinyu Li, Yuxin Wang, et al. "Elements and Chemical Bonds Contribution Estimation of Activity Coefficients in Nonideal Liquid Mixtures." Processes 10, no. 10 (2022): 2141. http://dx.doi.org/10.3390/pr10102141.

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Based on the contribution of elements and chemical bonds, the UNICAC (Universal Quasi-Chemical elements and chemical bonds Activity Coefficient) method was proposed to estimate the activity coefficients of nonelectrolyte liquid mixtures. The UNICAC method defined 10 elements and 33 chemical bonds as contribution groups. The calculation of activity coefficients was divided into the combination term and the residual term. The combination term represents molecular size differences, and the residual term describes the interaction between molecules. The interaction energy parameters of 43 groups we

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Bustamante, Ramiro O., Daniela Quiñones, Milen Duarte, Estefany Goncalves, and Lohengrin A. Cavieres. "Invasive Stages within Alien Species and Hutchinson’s Duality: An Example Using Invasive Plants of the Family Fabaceae in Central Chile." Plants 11, no. 8 (2022): 1063. http://dx.doi.org/10.3390/plants11081063.

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To understand the factors that limit invasive expansion in alien species, it is critical to predict potential zones of colonization. Climatic niche can be an important way to predict the potential distribution of alien species. This correlation between niche and geographic distribution is called Hutchinson’s duality. A combination of global and regional niches allows four invasive stages to be identified: quasi-equilibrium, local adaptation, colonization and sink stage. We studied the invasive stages of six alien leguminous species either in the niche or the geographical space. In five of the

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Hansen, Zachary R., Larissa E. Back, and Peigen Zhou. "Boundary Layer Quasi-Equilibrium Limits Convective Intensity Enhancement from the Diurnal Cycle in Surface Heating." Journal of the Atmospheric Sciences 77, no. 1 (2019): 217–37. http://dx.doi.org/10.1175/jas-d-18-0346.1.

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Abstract A combination of cloud-permitting model (CPM) simulations, satellite, and reanalysis data are used to test whether the diurnal cycle in surface temperature has a significant impact on the intensity of deep convection as measured by high-percentile updraft velocities, lightning, and CAPE. The land–ocean contrast in lightning activity shows that convective intensity varies between land and ocean independently from convective quantity. Thus, a mechanism that explains the land–ocean contrast must be able to do so even after controlling for precipitation variations. Motivated by the land–o

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Dobroserdova, A., E. Minina, J. J. Cerdà, C. Holm, and S. Kantorovich. "Microstructure of Bidisperse Ferrofluids in a Monolayer." Solid State Phenomena 190 (June 2012): 625–28. http://dx.doi.org/10.4028/www.scientific.net/ssp.190.625.

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In the present study we briefly analyze the cluster structures observed in the model bidisperse ferrofluid constrained in quasi-2D (q2D) layer in the absence of an externally applied magnetic field. We use a combination of a DFT approach and molecular dynamic simulation to quantitatively describe various chain and ring structures and their equilibrium area fractions. We also show that to reach a good agreement between simulation data and theoretical predictions in q2D geometry in theory one needs to allow for more possible chain configurations than in the bulk system. We provide preliminary ex

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9

Hieu, Dang Van. "STRONG CONVERGENCE OF A NEW HYBRID ALGORITHM FOR FIXED POINT PROBLEMS AND EQUILIBRIUM PROBLEMS." Mathematical Modelling and Analysis 24, no. 1 (2018): 1–19. http://dx.doi.org/10.3846/mma.2019.001.

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The paper considers the problem of finding a common solution of a pseudomonotone and Lipschitz-type equilibrium problem and a fixed point problem for a quasi nonexpansive mapping in a Hilbert space. A new hybrid algorithm is introduced for approximating a solution of this problem. The presented algorithm can be considered as a combination of the extragradient method (two-step proximal-like method) and a modified version of the normal Mann iteration. It is well known that the normal Mann iteration has the weak convergence, but in this paper we has obtained the strong convergence of the new algo

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10

Dou, Hong-Xia, and Liang-Jian Deng. "A Proximal Algorithm with Convergence Guarantee for a Nonconvex Minimization Problem Based on Reproducing Kernel Hilbert Space." Symmetry 13, no. 12 (2021): 2393. http://dx.doi.org/10.3390/sym13122393.

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The underlying function in reproducing kernel Hilbert space (RKHS) may be degraded by outliers or deviations, resulting in a symmetry ill-posed problem. This paper proposes a nonconvex minimization model with ℓ0-quasi norm based on RKHS to depict this degraded problem. The underlying function in RKHS can be represented by the linear combination of reproducing kernels and their coefficients. Thus, we turn to estimate the related coefficients in the nonconvex minimization problem. An efficient algorithm is designed to solve the given nonconvex problem by the mathematical program with equilibrium

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Wiechen, H., and H. J. Ziegler. "Relaxation of collisionless plasmas." Journal of Plasma Physics 51, no. 2 (1994): 341–53. http://dx.doi.org/10.1017/s0022377800017591.

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We present a new theory for the relaxation of two-dimensional collisionless quasi-neutral plasmas by mixing in phase space. In general, mixing in phase space does not lead to equilibrium states in the framework of exact, collisionless theory. However, filamentation on smaller and smaller scales can result in stationary states from a macroscopic (coarse-grained) point of view. In a first step we discuss a general technique to calculate suitably stable equilibria of collisionless plasmas. In a second step we develop a model relaxation that yields a simple transition to a description on macroscop

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Sosa, Adriel, Juan Ortega, Luis Fernández, Arturo Romero, Aurora Santos, and David Lorenzo. "Evaluation of VLEs for Binaries of Five Compounds Involved in the Production Processes of Cyclohexanone." ChemEngineering 6, no. 3 (2022): 42. http://dx.doi.org/10.3390/chemengineering6030042.

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In an attempt to evaluate the separation of certain impurities that arise in some stages of the production of cyclohexanone, this work analyzed the possibility of removing five of these substances via rectification. Due to the scarcity of experimental vapor–liquid equilibrium data for most of the solutions in the effluent of the global process, prior knowledge of their behavior is required. In this work, two predictive models, UNIFAC and COSMO-RS, were used to determine a priori the possibility of obtaining, by distillation, the individual components of seven of the binaries formed by the comb

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Trung, Nguyen Thoi, and Nguyen Xuan Hung. "About applying directly the alpha finite element method (\(\alpha\)FEM) for solid mechanics using triangular and tetrahedral elements." Vietnam Journal of Mechanics 32, no. 4 (2010): 235–46. http://dx.doi.org/10.15625/0866-7136/32/4/292.

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An alpha finite element method (\(\alpha\)FEM) has been recently proposed to compute nearly exact solution in strain energy for solid mechanics problems using three-node triangular (\(\alpha\)FEM-T3) and four-node tetrahedral (\(\alpha\)FEM-T4) elements. In the \(\alpha\)FEM, a scale factor \(\alpha \in [0, 1]\) is used to combine the standard fully compatible model of the FEM with a quasi-equilibrium model of the node-based smoothed FEM (NS-FEM). This novel combination of the FEM and NS-FEM makes the best use of the upper bound property of the NS-FEM and the lower bound property of the standa

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Lombardi, F., M. Chiesi, F. Maselli, et al. "Mapping the accumulation of woody biomass in Mediterranean beech forests by the combination of BIOME-BGC and ancillary data." Canadian Journal of Forest Research 46, no. 9 (2016): 1122–31. http://dx.doi.org/10.1139/cjfr-2016-0162.

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A modelling strategy is proposed to obtain spatially explicit estimates of net carbon accumulation in Italian beech forests. This approach is based on the use of a biogeochemical model, BIOME-BGC, which is capable of simulating all main processes of ecosystems in quasi-equilibrium conditions. The model predictions are then corrected for actual forest biomass (growing stock volume) and stand age. The method is applied to predict the current annual increment (CAI) of 30 beech forest stands in Molise, Central Italy, which have been sampled during several measurement campaigns. A preliminary test

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Jiang, Guoqing, Ting Dong, and Zhenkun Guo. "Nonlinear Dynamics of an Unsymmetric Cross-Ply Square Composite Laminated Plate for Vibration Energy Harvesting." Symmetry 13, no. 7 (2021): 1261. http://dx.doi.org/10.3390/sym13071261.

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The nonlinear behaviors and energy harvesting of an unsymmetric cross-ply square composite laminated plate with a piezoelectric patch is presented. The unsymmetric cross-ply square composite laminated plate has two stable equilibrium positions by applying thermal stress, thus having snap-through with larger amplitude between the two stable equilibrium positions relative to the general laminated plate. Based on the von-Karman large deformation theory, the nonlinear electromechanical coupling equations of motion of the unsymmetric composite laminated plate with a piezoelectric patch are derived

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16

FAVIER, B., F. S. GODEFERD, C. CAMBON, A. DELACHE, and W. J. T. BOS. "Quasi-static magnetohydrodynamic turbulence at high Reynolds number." Journal of Fluid Mechanics 681 (June 21, 2011): 434–61. http://dx.doi.org/10.1017/jfm.2011.207.

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We analyse the anisotropy of homogeneous turbulence in an electrically conducting fluid submitted to a uniform magnetic field, for low magnetic Reynolds number, in the quasi-static approximation. We interpret contradictory earlier predictions between linearized theory and simulations: in the linear limit, the kinetic energy of transverse velocity components, normal to the magnetic field, decays faster than the kinetic energy of the axial component, along the magnetic field (Moffatt, J. Fluid Mech., vol. 28, 1967, p. 571); whereas many numerical studies predict a final state characterized by do

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Uzdenova, Aminat, Anna Kovalenko, Makhamet Urtenov, and Victor Nikonenko. "1D Mathematical Modelling of Non-Stationary Ion Transfer in the Diffusion Layer Adjacent to an Ion-Exchange Membrane in Galvanostatic Mode." Membranes 8, no. 3 (2018): 84. http://dx.doi.org/10.3390/membranes8030084.

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The use of the Nernst–Planck and Poisson (NPP) equations allows computation of the space charge density near solution/electrode or solution/ion-exchange membrane interface. This is important in modelling ion transfer, especially when taking into account electroconvective transport. The most solutions in literature use the condition setting a potential difference in the system (potentiostatic or potentiodynamic mode). However, very often in practice and experiment (such as chronopotentiometry and voltammetry), the galvanostatic/galvanodynamic mode is applied. In this study, a depleted stagnant

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STOCK, REINHARD. "HADRON FORMATION IN HIGH ENERGY ELEMENTARY AND NUCLEAR COLLISIONS." International Journal of Modern Physics E 16, no. 03 (2007): 687–714. http://dx.doi.org/10.1142/s0218301307006216.

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We consider the dynamical origin of the apparent statistical equilibrium that governs the yields, and yield ratios, of all hadron and resonance species (consisting of the three light quark flavours) produced in nucleus-nucleus collisions from AGS via SPS to RHIC energies [Formula: see text]. This hadro-chemical equilibrium state is well described, overall, by the grand canonical, quasi-classical Gibbs ensemble of all corresponding hadrons and resonances. In order to pin down the stochastic elements, featured by the dynamical evolution prior to hadron formation and hadronic "chemical" (i.e. spe

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19

Stap, Lennert B., Constantijn J. Berends, and Roderik S. W. van de Wal. "Miocene Antarctic Ice Sheet area adapts significantly faster than volume to CO₂-induced climate change." Climate of the Past 20, no. 1 (2024): 257–66. http://dx.doi.org/10.5194/cp-20-257-2024.

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Abstract. The strongly varying benthic δ18O levels of the early and mid-Miocene (23 to 14 Myr ago) are primarily caused by a combination of changes in Antarctic Ice Sheet (AIS) volume and deep-ocean temperatures. These factors are coupled since AIS changes affect deep-ocean temperatures. It has recently been argued that this is due to changes in ice sheet area rather than volume because area changes affect the surface albedo. This finding would be important when the transient AIS grows relatively faster in extent than in thickness, which we test here. We analyse simulations of Miocene AIS vari

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20

Li, Hui, Dechang Pi, and Chishe Wang. "The Prediction of Protein-Protein Interaction Sites Based on RBF Classifier Improved by SMOTE." Mathematical Problems in Engineering 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/528767.

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Protein-protein interaction sites are the basis of biomolecule interactions, which are widely used in drug target identification and new drug discovery. Traditional site predictors of protein-protein interaction mostly based on unbalanced datasets, the classification results tend to negative class, resulting in a lower predictive accuracy for positive class. A method called RBFIS (radial basis function improved by SMOTE) is presented in the paper to address the problem. The intelligent algorithm SMOTE is used to artificially synthesize the imbalanced datasets of negative sample classes. Simult

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Kovalchuk, Nina. "Spontaneous oscillations due to solutal Marangoni instability: air/water interface." Open Chemistry 10, no. 5 (2012): 1423–41. http://dx.doi.org/10.2478/s11532-012-0083-5.

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AbstractSystems far from equilibrium are able to self-organize and often demonstrate the formation of a large variety of dissipative structures. In systems with free liquid interfaces, self-organization is frequently associated with Marangoni instability. The development of solutal Marangoni instability can have specific features depending on the properties of adsorbed surfactant monolayer. Here we discuss a general approach to describe solutal Marangoni instability and review in details the recent experimental and theoretical results for a system where the specific properties of adsorbed laye

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Kožar, Ivica, Joško Ožbolt, and Tatjana Pecak. "Load-Rate Sensitivity in 1D Non-Linear Viscoelastic Model." Key Engineering Materials 488-489 (September 2011): 731–34. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.731.

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Load-rate sensitivity of material is important in impact and other dynamic loadings. It is assumed that the strain-rate sensitivity is not a material property but comes out naturally from dynamic equilibrium equations. Material is assumed non-linear, similar as used in the microplane model for quasi-brittle materials, and viscoelastic arranged into Kelvin scheme. The scheme is the simplest possible and consists of two Kelvin bars in series with an optional mass between them (Maxwell bars are considered in our previous paper). Loading is uniaxial tension with changing intensity in time, asympto

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Ursolov, Aleksandr, Yuriy Batrak, and Wieslaw Tarelko. "Application of the Optimization Methods to the Search of Marine Propulsion Shafting Global Equilibrium in Running Condition." Polish Maritime Research 26, no. 3 (2019): 172–80. http://dx.doi.org/10.2478/pomr-2019-0058.

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Abstract Full-film hydrodynamic lubrication of marine propulsion shafting journal bearings in running condition is discussed. Considerable computational difficulties in non-linear determining the quasi-static equilibrium of the shafting are highlighted. To overcome this problem the approach using two optimization methods (the particle swarm method and the interior point method) in combination with the specially developed relaxation technique is proposed. The developed algorithm allows to calculate marine propulsion shafting bending with taking into account lubrication in all journal bearings a

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Lossow, Stefan, Farahnaz Khosrawi, Gerald E. Nedoluha, et al. "The SPARC water vapour assessment II: comparison of annual, semi-annual and quasi-biennial variations in stratospheric and lower mesospheric water vapour observed from satellites." Atmospheric Measurement Techniques 10, no. 3 (2017): 1111–37. http://dx.doi.org/10.5194/amt-10-1111-2017.

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Abstract. In the framework of the second SPARC (Stratosphere-troposphere Processes And their Role in Climate) water vapour assessment (WAVAS-II), the amplitudes and phases of the annual, semi-annual and quasi-biennial variation in stratospheric and lower mesospheric water were compared using 30 data sets from 13 different satellite instruments. These comparisons aimed to provide a comprehensive overview of the typical uncertainties in the observational database which can be considered in subsequent observational and modelling studies. For the amplitudes, a good agreement of their latitude and

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Margielewicz, Jerzy, Damian Gąska, Grzegorz Litak, Piotr Wolszczak, and Shengxi Zhou. "Energy Harvesting in a System with a Two-Stage Flexible Cantilever Beam." Sensors 22, no. 19 (2022): 7399. http://dx.doi.org/10.3390/s22197399.

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The subject of the research contained in this paper is a new design solution for an energy harvesting system resulting from the combination of a quasi-zero-stiffness energy harvester and a two-stage flexible cantilever beam. Numerical tests were divided into two main parts-analysis of the dynamics of the system due to periodic, quasiperiodic, and chaotic solutions and the efficiency of energy generation. The results of numerical simulations were limited to zero initial conditions as they are the natural position of the static equilibrium. The article compares the energy efficiency for the sele

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Dokichev, V. A., A. I. Voloshin, N. E. Nifantiev, M. P. Egorov, D. R. Kireeva, and A. V. Isakov. "New «green» inhibitors of gas hydrate formation for the oil and gas industry based on polysaccharides." SOCAR Proceedings, SI1 (June 30, 2021): 33–40. http://dx.doi.org/10.5510/ogp2021si100507.

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The thermobaric conditions for the formation of gas hydrates in the presence of the sodium salt of carboxymethylcellulose, dextran, and arabinogalactan were studied in a quasi-equilibrium thermodynamic experiment. It is established that polysaccharides slow down the rate and change the conditions of gas hydrate formation of a mixture of natural gases, showing the properties of a thermodynamic and kinetic inhibitor with technological efficiency exceeding methanol by 170-270 times when used in the same dosages. The results of the development of a «green» synergistic inhibitor of gas hydrate form

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Zhao, Shanwen, Chanling Wei, Zhian Sun, et al. "Preparation of Restricted Access Media-Molecularly Imprinted Polymers for the Detection of Chloramphenicol in Bovine Serum." Journal of Analytical Methods in Chemistry 2019 (December 12, 2019): 1–12. http://dx.doi.org/10.1155/2019/7930102.

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Chloramphenicol- (CAP-) restricted access media-molecularly imprinted polymers (CAP-RAM-MIPs) were prepared by precipitation polymerization using CAP as a template molecule, 2-diethylaminoethyl methacrylate (DEAEM) as a functional monomer, ethylene glycol dimethyl acrylate (EDMA) as a crosslinking agent, glycidyl methacrylate (GMA) as an outer hydrophilic functional monomer, and acetonitrile as a pore former and solvent. The CAP-RAM-MIPs were successfully characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis. The adsorption perfo

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Scantamburlo, E., and M. Guzzo. "Short-period effects of the planetary perturbations on the Sun–Earth Lagrangian point L3." Astronomy & Astrophysics 638 (June 2020): A137. http://dx.doi.org/10.1051/0004-6361/202037696.

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Context. The Lagrangian point L3 of the Sun–Earth system, and its Lyapunov orbits, have been proposed to perform station-keeping, although L3 is only rigorously defined for the extremely simplified model represented by the reduced Sun–Earth–spacecraft system. As in L3 the planetary perturbations (mainly from Jupiter and Venus) are stronger than Earth’s attraction, it is necessary to understand whether or not the dynamics close to L3 persist under such a strong perturbation, allowing for a definition of dynamical substitutes for models that are more realistic than the circular restricted three-

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Meng, Lingshuai, Jinggong Sun, and Wenjuan Wu. "Theoretical Design and Characteristics Analysis of a Quasi-Zero Stiffness Isolator Using a Disk Spring as Negative Stiffness Element." Shock and Vibration 2015 (2015): 1–19. http://dx.doi.org/10.1155/2015/813763.

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This paper presents a novel quasi-zero stiffness (QZS) isolator designed by combining a disk spring with a vertical linear spring. The static characteristics of the disk spring and the QZS isolator are investigated. The optimal combination of the configurative parameters is derived to achieve a wide displacement range around the equilibrium position in which the stiffness has a low value and changes slightly. By considering the overloaded or underloaded conditions, the dynamic equations are established for both force and displacement excitations. The frequency response curves (FRCs) are obtain

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Uyulan, Çağlar, and Batuhan İpek. "Watt Six-Bar Compliant Mechanism Analysis Based on Kinematic and Dynamic Responses." Scientific Research Communications 1, no. 1 (2021): 1–25. http://dx.doi.org/10.52460/src.2021.002.

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In this study, a complete guide to kinematic and kinetic analyses of a Watt type six-bar compliant mechanism is conducted incorporating the flexible buckling of the initially straight element. In the analysis procedure, the hybrid utilization of the pseudo-rigid-body model (PRBM) and the nonlinear elastic theory of beam buckling is presented. This partially compliant mechanism comprises three rigid links and two flexible links. The kinematic analyses of the mechanisms are done by using the vector loop closure equations, the PRBM of a large deflection cantilever beam, and derivation of nonlinea

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Zika, Jan D., Julien Le Sommer, Carolina O. Dufour, Alberto Naveira-Garabato, and Adam Blaker. "Acceleration of the Antarctic Circumpolar Current by Wind Stress along the Coast of Antarctica." Journal of Physical Oceanography 43, no. 12 (2013): 2772–84. http://dx.doi.org/10.1175/jpo-d-13-091.1.

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Abstract The influence of wind forcing on variability of the Antarctic Circumpolar Current (ACC) is investigated using a series of eddy-permitting ocean–sea ice models. At interannual and decadal time scales the ACC transport is sensitive to both the mean strength of westerly winds along the ACC circumpolar path, consistent with zonal momentum balance theories, and sensitive to the wind stresses along the coast of Antarctica, consistent with the “free mode” theory of Hughes et al. A linear combination of the two factors explains differences in ACC transport across 11 regional quasi-equilibrium

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Park, Sungsu. "A Unified Convection Scheme (UNICON). Part I: Formulation." Journal of the Atmospheric Sciences 71, no. 11 (2014): 3902–30. http://dx.doi.org/10.1175/jas-d-13-0233.1.

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Abstract The author develops a unified convection scheme (UNICON) that parameterizes relative (i.e., with respect to the grid-mean vertical flow) subgrid vertical transport by nonlocal asymmetric turbulent eddies. UNICON is a process-based model of subgrid convective plumes and mesoscale organized flow without relying on any quasi-equilibrium assumptions such as convective available potential energy (CAPE) or convective inhibition (CIN) closures. In combination with a relative subgrid vertical transport scheme by local symmetric turbulent eddies and a grid-scale advection scheme, UNICON simula

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Shneerson G.A. and Shishigin S.L. "Features of the application of the virial theorem for magnetic systems with quasi-force-free windings." Technical Physics 92, no. 2 (2022): 250. http://dx.doi.org/10.21883/tp.2022.02.53577.249-21.

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The article shows that in a magnetic system with a thin-walled balanced winding close to a force-free one, a significant increase in the parameter theta=W_Mγ/MsigmaM, is possible, which, according to the virial theorem, characterizes the ratio of the energy of the magnetic system WM to the weight of equipment with a material density γ, where under the action of electromagnetic forces there appears a mechanical stress sigmaM. In a quasi-force-free magnetic system, the main part of the winding is in a state of local equilibrium, and only a relatively small part of the equipment is subject to str

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Tassev, Vladimir L., and Shivashankar R. Vangala. "Thick Hydride Vapor Phase Heteroepitaxy: A Novel Approach to Growth of Nonlinear Optical Materials." Crystals 9, no. 8 (2019): 393. http://dx.doi.org/10.3390/cryst9080393.

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At the time when many nonlinear optical (NLO) materials for frequency conversion of laser sources in the mid and long-wave infrared have achieved their fundamental or technological limits, we propose heteroepitaxy as a solution to develop novel NLO materials. Heteroepitaxy, is the most applied method to combine two different materials—by growing one material on another. In this work we show that combining two binary materials in a ternary may significantly improve the NLO properties that are of great importance for the pursued applications. Plus, due to the closer lattice match to the related

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Cerca, José, Angel G. Rivera-Colón, Mafalda S. Ferreira, et al. "Incomplete lineage sorting and ancient admixture, and speciation without morphological change in ghost-worm cryptic species." PeerJ 9 (February 9, 2021): e10896. http://dx.doi.org/10.7717/peerj.10896.

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Morphologically similar species, that is cryptic species, may be similar or quasi-similar owing to the deceleration of morphological evolution and stasis. While the factors underlying the deceleration of morphological evolution or stasis in cryptic species remain unknown, decades of research in the field of paleontology on punctuated equilibrium have originated clear hypotheses. Species are expected to remain morphologically identical in scenarios of shared genetic variation, such as hybridization and incomplete lineage sorting, or in scenarios where bottlenecks reduce genetic variation and co

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Marks, David F. "I Am Conscious, Therefore, I Am: Imagery, Affect, Action, and a General Theory of Behavior." Brain Sciences 9, no. 5 (2019): 107. http://dx.doi.org/10.3390/brainsci9050107.

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Organisms are adapted to each other and the environment because there is an inbuilt striving toward security, stability, and equilibrium. A General Theory of Behavior connects imagery, affect, and action with the central executive system we call consciousness, a direct emergent property of cerebral activity. The General Theory is founded on the assumption that the primary motivation of all of consciousness and intentional behavior is psychological homeostasis. Psychological homeostasis is as important to the organization of mind and behavior as physiological homeostasis is to the organization

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Zamanian, M., and S. E. Khadem. "Stability analysis of an electrically actuated microbeam using the Melnikov theorem and Poincaré mapping." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 2 (2010): 488–97. http://dx.doi.org/10.1243/09544062jmes2273.

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In this article, the stability of a microbeam under an electric actuation is studied. The electric actuation is induced by applying a voltage between the microbeam and an electrode plate that lies at the opposite side of the microbeam. In microswitches, the electric actuation is applied as a DC voltage, and in microresonators it is applied as a combination of AC—DC voltages. It is assumed that the midplane of the microbeam is stretched when it is deflected. It is also shown that by the altering DC electric actuation as a control parameter in a microswitch system, a stable and an unstable branc

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Boos, William R., and Kerry A. Emanuel. "Wind–Evaporation Feedback and Abrupt Seasonal Transitions of Weak, Axisymmetric Hadley Circulations." Journal of the Atmospheric Sciences 65, no. 7 (2008): 2194–214. http://dx.doi.org/10.1175/2007jas2608.1.

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Abstract For an imposed thermal forcing localized off the equator, it is known that conservation of absolute angular momentum in axisymmetric flow produces a nonlinear response once the forcing exceeds a critical amplitude. It is shown here that, for a moist atmosphere in convective quasi-equilibrium, the combination of wind-dependent ocean surface enthalpy fluxes and zonal momentum advection can provide a separate feedback that causes the meridional flow to evolve nonlinearly as a function of a sea surface temperature (SST) forcing, even if an angular momentum–conserving response is not achie

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Zhang, X., G. Lohmann, G. Knorr, and X. Xu. "Different ocean states and transient characteristics in Last Glacial Maximum simulations and implications for deglaciation." Climate of the Past 9, no. 5 (2013): 2319–33. http://dx.doi.org/10.5194/cp-9-2319-2013.

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Abstract. The last deglaciation is one of the best constrained global-scale climate changes documented by climate archives. Nevertheless, understanding of the underlying dynamics is still limited, especially with respect to abrupt climate shifts and associated changes in the Atlantic meridional overturning circulation (AMOC) during glacial and deglacial periods. A fundamental issue is how to obtain an appropriate climate state at the Last Glacial Maximum (LGM, 21 000 yr before present, 21 ka BP) that can be used as an initial condition for deglaciation. With the aid of a comprehensive climate

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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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HAMEED, M., M. SIEGEL, Y. N. YOUNG, J. LI, M. R. BOOTY, and D. T. PAPAGEORGIOU. "Influence of insoluble surfactant on the deformation and breakup of a bubble or thread in a viscous fluid." Journal of Fluid Mechanics 594 (December 14, 2007): 307–40. http://dx.doi.org/10.1017/s0022112007009032.

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The influence of surfactant on the breakup of a prestretched bubble in a quiescent viscous surrounding is studied by a combination of direct numerical simulation and the solution of a long-wave asymptotic model. The direct numerical simulations describe the evolution toward breakup of an inviscid bubble, while the effects of small but non-zero interior viscosity are readily included in the long-wave model for a fluid thread in the Stokes flow limit.The direct numerical simulations use a specific but realizable and representative initial bubble shape to compare the evolution toward breakup of a

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Amer, Sayed M., Maria V. Glavatskikh, Ruslan Yu Barkov, Irina S. Loginova, and Andrey V. Pozdniakov. "Effect of Cr on the Microstructure and Mechanical Properties of the Al-Cu-Y-Zr Alloy." Metals 13, no. 2 (2023): 349. http://dx.doi.org/10.3390/met13020349.

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The present investigation aimed at the determination of Cr addition on microstructure, phase composition, and mechanical properties of the Al-Cu-Y-Zr alloy. Quasi-binary alloys of the ternary Al-Cu-Y system with atomic rotation of Cu/Y = 4/1 have a narrow solidification range with high solidus temperature. The addition of 0.3%Cr in the Al-5.1Cu-1.7Y-0.3Zr alloy provides a formation of a novel quaternary Al81-85Cu7-10Y3-4Cr5 phase. L12-Al3(Zr,Y) phase spherical particles with a diameter of 50 nm were nucleated during solution treatment at 600 °C. Al7Cr precipitates were not found in the microst

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Dey, D., Jeet Amrit Pattnaik, H. C. Das, Ankit Kumar, R. N. Panda, and S. K. Patra. "Dark matter influence on quarkyonic stars: a relativistic mean field analysis." Journal of Cosmology and Astroparticle Physics 2025, no. 01 (2025): 056. https://doi.org/10.1088/1475-7516/2025/01/056.

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Abstract The formulation of quarkyonic matter consists of treating both quarks and nucleons as quasi-particles, where a cross-over transition occurs between the two phases. This work is based on some of the early ideas of quark matter (QM). It has satisfied the different observational constraints on the neutron star (NS), such as its maximum mass and the canonical radius. In addition, we put an extra component inside the NS, known as Dark Matter (DM) because it is trapped due to its immense gravitational potential. In this work, we explore the impact of fermionic DM on the structure of the NS.

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Cheng, Chaojie, and Harald Milsch. "Evolution of Fracture Aperture in Quartz Sandstone under Hydrothermal Conditions: Mechanical and Chemical Effects." Minerals 10, no. 8 (2020): 657. http://dx.doi.org/10.3390/min10080657.

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Fractures efficiently affect fluid flow in geological formations, and thereby determine mass and energy transport in reservoirs, which are not least exploited for economic resources. In this context, their response to mechanical and thermal changes, as well as fluid–rock interactions, is of paramount importance. In this study, a two-stage flow-through experiment was conducted on a pure quartz sandstone core of low matrix permeability, containing one single macroscopic tensile fracture. In the first short-term stage, the effects of mechanical and hydraulic aperture on pressure and temperature c

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Шнеерсон, Г. А., та С. Л. Шишигин. "Особенности применения теоремы вириала для магнитных систем с квазибессиловыми обмотками". Журнал технической физики 92, № 2 (2022): 303. http://dx.doi.org/10.21883/jtf.2022.02.52022.249-21.

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The article shows that in a magnetic system with a thin-walled balanced winding close to a force-free one, a significant increase in the parameter θ=WM γ/M σМ , is possible, which, according to the virial theorem, characterizes the ratio of the energy of the magnetic system WM to the weight of equipment with a material density γ, where under the action of electromagnetic forces there appears a mechanical stress σМ. In a quasi-force-free magnetic system, the main part of the winding is in a state of local equilibrium, and only a relatively small part of the equipment is subject to stress. This

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Balsara, Dinshaw, Deepak Bhoriya, Olindo Zanotti, and Michael Dumbser. "Well-balanced High-order Finite Difference Weighted Essentially Nonoscillatory Schemes for a First-order Z4 Formulation of the Einstein Field Equations." Astrophysical Journal Supplement Series 275, no. 1 (2024): 18. http://dx.doi.org/10.3847/1538-4365/ad7d0d.

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Abstract We develop a new class of high-order accurate well-balanced finite difference (FD) weighted essentially nonoscillatory (WENO) methods for numerical general relativity (GR), which can be applied to any first-order reduction of the Einstein field equations, even if nonconservative terms are present. We choose the first-order nonconservative Z4 formulation of the Einstein equations, which has a built-in cleaning procedure that accounts for the Einstein constraints and that has already shown its ability in keeping stationary solutions stable over long timescales. By introducing auxiliary

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Mamadova, S. H., F. M. Sadigov, Z. I. Ismailov, K. B. Kim, and S. I. Niftaliyev. "Investigation of the Er-Sb-Te system." Proceedings of the Voronezh State University of Engineering Technologies 86, no. 3 (2024): 209–16. https://doi.org/10.20914/2310-1202-2024-3-209-216.

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Methods of physicochemical analysis, namely differential thermal analysis (DTA), high temperature differential thermal analysis (HTTA), X-ray phase analysis (XRD), microstructural analysis (MSA) and microhardness measurements are used to determine the nature of the physicochemical interaction in the Er-Sb-Te ternary system.. Phase diagrams of the following quasi-binary Er2Te3-Sb2Te3, ErTe-Sb2Te3, ErTe-SbTe, ErTe-Sb and non-quasi-binary Er-Sb2Te3, D (ErSb3Te5,5)-Te sections are presented for the first time. It has been established that at a component ratio of 1:1 in the Er2Te3-Sb2Te3 system, a

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Mishchenko, Andrey, Maxim Veshkin, Vladimir Mondrus, and Leonid Stupishin. "RATIONAL DESIGN OF NONLINEAR-DEFORMABLE STRUCTURALLYHETEROGENEOUS ELEMENTS OF STRUCTURES." International Journal for Computational Civil and Structural Engineering 20, no. 3 (2024): 97–115. https://doi.org/10.22337/2587-9618-2024-20-3-97-115.

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The article deals with the problem of rational design of a nonlinearly deformable heterogeneous composite Timoshenko rod under force impact. The rod has a structure that is symmetrical relative to the force plane, formed by the connection of quasi-homogeneous parts (phases, layers) with different physical properties, taking any geometric shape in space. The structural materials that form the rod have nonlinear elastic properties. To describe the main component of the stress tensor – the normal stress in the longitudinal direction – in each phase, the same type of approximation by entire ration

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Zhang, Yating, Shujie Zhang, Lisong Fu, and Mengke Jing. "Study on antibacterial and copper ion removal of chitosan fiber/acetate fiber and yarn for water purification." Journal of Engineered Fibers and Fabrics 16 (January 2021): 155892502110613. http://dx.doi.org/10.1177/15589250211061387.

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Use chitosan (CS) fiber and cellulose acetate (CA) fiber with different mixing ratios as raw materials, the kinetic and thermodynamic characteristics of the adsorption process of chitosan fiber/cellulose acetate fiber (CS/CA) ratio of 90:10 are explored, and the adsorption process conforms to the quasi-second-order kinetic equation. It can be fitted by Langmuir isotherm. The adsorption process is a spontaneous thermal reaction with both physical adsorption and chemical adsorption. The best adsorption time is 30 min, the time to reach adsorption equilibrium is 180 min, and the best adsorption p

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Zuber, Alain, María-Carmen Álvarez, Edgar Mendoza, Miguel Ángel Díaz-Flores, Marco Galicia-Pérez, and Ernesto Torres-Orozco. "Monitoring Beach Shape Development and Sediment Dynamics on a Sandy Beach with Low Anthropogenic Influence." Land 11, no. 12 (2022): 2219. http://dx.doi.org/10.3390/land11122219.

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This study examined the evolution of the beach profile and sedimentary balance in Playa del Coco, Mexico, during one year (September 2013–September 2014) to monitor these conditions at a site with little or no anthropogenic influence. The type of beach profile was determined according to the energy profile of the geomorphology, resulting in three types of profiles: low, medium, and high energy. In addition, sediment volumes were quantified, and erosion or accumulation at each study site was described. The results showed that the medium-energy profile was characteristic of the beach most of the

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