Articles de revues : « Doubling property »

1

Su, Bo. « Doubling property of elliptic equations ». Communications on Pure & ; Applied Analysis 7, n^o 1 (2008) : 143–47. http://dx.doi.org/10.3934/cpaa.2008.7.143.

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Wang, Liqiu, et Mingtian Xu. « Property of period-doubling bifurcations ». Chaos, Solitons & ; Fractals 24, n^o 2 (avril 2005) : 527–32. http://dx.doi.org/10.1016/j.chaos.2004.09.045.

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Shkredov, I. D. « On sets with small doubling property ». Mathematical Notes 84, n^o 5-6 (décembre 2008) : 859–78. http://dx.doi.org/10.1134/s000143460811028x.

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Aimar, Hugo, Marilina Carena et Bibiana Iaffei. « Gradual doubling property of Hutchinson orbits ». Czechoslovak Mathematical Journal 65, n^o 1 (mars 2015) : 191–205. http://dx.doi.org/10.1007/s10587-015-0168-3.

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Le Donne, Enrico. « Doubling Property for BiLipschitz Homogeneous Geodesic Surfaces ». Journal of Geometric Analysis 21, n^o 4 (4 août 2010) : 783–806. http://dx.doi.org/10.1007/s12220-010-9167-7.

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Jin, Renling. « Freiman's inverse problem with small doubling property ». Advances in Mathematics 216, n^o 2 (décembre 2007) : 711–52. http://dx.doi.org/10.1016/j.aim.2007.06.002.

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Zhu, Jiuyi. « Doubling Property and Vanishing Order of Steklov Eigenfunctions ». Communications in Partial Differential Equations 40, n^o 8 (16 avril 2015) : 1498–520. http://dx.doi.org/10.1080/03605302.2015.1025980.

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Baudoin, Fabrice, et Nicola Garofalo. « Perelman’s Entropy and Doubling Property on Riemannian Manifolds ». Journal of Geometric Analysis 21, n^o 4 (14 septembre 2010) : 1119–31. http://dx.doi.org/10.1007/s12220-010-9180-x.

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Heer, Loreno. « Some Invariant Properties of Quasi-Möbius Maps ». Analysis and Geometry in Metric Spaces 5, n^o 1 (2 septembre 2017) : 69–77. http://dx.doi.org/10.1515/agms-2017-0004.

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Abstract We investigate properties which remain invariant under the action of quasi-Möbius maps of quasimetric spaces. A metric space is called doubling with constant D if every ball of finite radius can be covered by at most D balls of half the radius. It is shown that the doubling property is an invariant property for (quasi-)Möbius maps. Additionally it is shown that the property of uniform disconnectedness is an invariant for (quasi-)Möbius maps as well.

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Caffarelli, Luis A., et Michael G. Crandall. « Relations between geometric convexity, doubling measures and property $\Gamma $ ». Proceedings of the American Mathematical Society 142, n^o 7 (21 mars 2014) : 2395–406. http://dx.doi.org/10.1090/s0002-9939-2014-11940-x.

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Xu, Mingtian. « Property of period-doubling bifurcation cascades of discrete dynamical systems ». Chaos, Solitons & ; Fractals 33, n^o 2 (juillet 2007) : 455–62. http://dx.doi.org/10.1016/j.chaos.2006.01.022.

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Adamowicz, Tomasz, Antoni Kijowski et Elefterios Soultanis. « Asymptotically Mean Value Harmonic Functions in Doubling Metric Measure Spaces ». Analysis and Geometry in Metric Spaces 10, n^o 1 (1 janvier 2022) : 344–72. http://dx.doi.org/10.1515/agms-2022-0143.

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Abstract We consider functions with an asymptotic mean value property, known to characterize harmonicity in Riemannian manifolds and in doubling metric measure spaces. We show that the strongly amv-harmonic functions are Hölder continuous for any exponent below one. More generally, we define the class of functions with finite amv-norm and show that functions in this class belong to a fractional Hajłasz–Sobolev space and their blow-ups satisfy the mean-value property. Furthermore, in the weighted Euclidean setting we find an elliptic PDE satisfied by amv-harmonic functions.

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Suzuki, S. « Bing doubling and the colored Jones polynomial ». International Journal of Mathematics 25, n^o 08 (juillet 2014) : 1450074. http://dx.doi.org/10.1142/s0129167x14500748.

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Bing doubling is a satellite operation on links which replaces a knot component with a 2-component link in a certain way. In this paper we give a formula for the reduced colored Jones polynomial of a Bing double in terms of that of the companion. Using this formula we derive a divisibility property of the unified Witten–Reshetikhin–Turaev invariant of integral homology spheres obtained by ±1-surgery along Bing doubles of knots. This result is applied to the Witten–Reshetikhin–Turaev invariant and the Ohtsuki series of these integral homology spheres.

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Evans, Benny. « The Long Annulus Theorem ». Canadian Mathematical Bulletin 29, n^o 3 (1 septembre 1986) : 257–67. http://dx.doi.org/10.4153/cmb-1986-040-4.

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AbstractGiven a properly embedded incompressible surface F in a Haken manifold M, there is an integer n depending only on M and F with the following property: If there is a singular annulus in M that meets F in more then n nontrivial loops that are not freely homotopic on F then M contains an essential torus or annulus, or M is a bundle with fiber F, or M is a doubled twisted I-bundle with doubling surface F.

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Wang Zheng-Ping, Teng Bing, Du Chen-Lin, Xu Xin-Guang, Fu Kun, Xu Gui-Bao, Wang Ji-Yang et Shao Zong-Shu. « Frequency doubling property of the low symmetric nonlinear optical crystal BIBO ». Acta Physica Sinica 52, n^o 9 (2003) : 2176. http://dx.doi.org/10.7498/aps.52.2176.

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Mauldin, R. Daniel, et Mariusz Urbański. « The doubling property of conformal measures of infinite iterated function systems ». Journal of Number Theory 102, n^o 1 (septembre 2003) : 23–40. http://dx.doi.org/10.1016/s0022-314x(03)00065-9.

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Elsner, James B., Emily Ryan et Georgianna Strode. « Structural Property Losses from Tornadoes in Florida ». Weather, Climate, and Society 10, n^o 2 (19 février 2018) : 253–58. http://dx.doi.org/10.1175/wcas-d-17-0055.1.

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Abstract Property losses from tornadoes in Florida are estimated by combining a 1-km spatial grid of structural values from the Department of Revenue’s 2014 cadastral database with historical tornado events since 1950. There are 91 180 grid cells in the state with at least some structural value. Total and residential structural values total $942 billion and $619 billion, respectively. Over the period 1950 through 2015 there were 3233 individual tornado reports in the state with a peak frequency during June. The property value exposed to tornadoes is estimated using a geometric model for the path. Annual statewide total and residential structural property exposure to tornadoes is estimated at $171 million and $103 million, respectively. Property exposure to tornadoes peaks in February. A regression model quantifies the relationship between actual losses since 2007 and exposures. A doubling of the residential exposure increases actual recorded losses by 26% since 2007, and a doubling of nonresidential exposure increases losses by 21%, controlling for changes over time. Randomization of the historical tornado paths provides alternative exposure scenarios that are used to determine the probability of extreme loss years. Results from the Monte Carlo algorithm indicate a 1% chance that the annual loss will exceed $430 million and a 0.1% chance that it will exceed $1 billion. These findings, and the procedure to obtain them, should help property insurance and reinsurance companies gauge their risk of losses and prioritize their management actions.

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Rubin, Edward J. « Obligatory dative clitic-doubling of type III experiencers in Bulgnais ». Proceedings of the Linguistic Society of America 3, n^o 1 (3 mars 2018) : 18. http://dx.doi.org/10.3765/plsa.v3i1.4299.

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The correlation between the position of the Dative experiencer of a type III psych-verb relative to the verb itself and the obligatory vs. optional nature of an associated Dative clitic has seldom been noted in the literature, and it has never previously been explained. This paper presents relevant new data from Bulgnais (Bologna, Italy), and it proposes that these verbs, in the languages that require the Dative clitic with the preverbal Dative experiencer, have an additional strong lexical property beyond inherent Case licensing. Like Case licensing, this property requires feature checking, which is satisfied alternately by the clitic (unmarked word-order) or by the experiencer phrase. Only when the clitic checks the lexically required feature can the full experiencer move to the preverbal position, because otherwise, it is frozen in a postverbal position by its role in checking the mentioned strong lexical feature, which occurs lower in the verbal domain.

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LIU, HAIRONG, FANG LIU et HUI WU. « THE UNIQUE CONTINUATION PROPERTY OF -HARMONIC FUNCTIONS ON THE HEISENBERG GROUP ». Bulletin of the Australian Mathematical Society 99, n^o 2 (12 novembre 2018) : 219–30. http://dx.doi.org/10.1017/s0004972718001016.

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We introduce an Almgren frequency function of the sub-$p$-Laplace equation on the Heisenberg group to establish a doubling estimate under the assumption that the frequency function is locally bounded. From this, we obtain some partial results on unique continuation for the sub-$p$-Laplace equation.

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Mohd Roslan, Ummu Atiqah. « Sensitive Dependence on Initial Conditions for an Example of Markov Map : Skewed Doubling Map ». MATEMATIKA 34, n^o 1 (28 mai 2018) : 13–21. http://dx.doi.org/10.11113/matematika.v34.n1.1002.

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Markov map is one example of interval maps where it is a piecewise ex-panding map and obeys the Markov property. One well-known example of Markov map is the doubling map, a map which has two subintervals with equal partitions. In this paper, we are interested to investigate another type of Markov map, the so-called skewed doubling map. This map is a more generalized map than the doubling map. Thus, the aims of this paper are to nd the xed points as well as the periodic points for the skewed doubling map and to investigate the sensitive dependence on initial conditions of this map. The method considered here is the cobweb diagram. Numerical results suggest that there exist dense of periodic orbits for this map. The sensitivity of this map to initial conditions is also veried where small differences in initial conditions give dierent behaviour of the orbits in the map.

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Llorente, Jos� G. « On the Gehring-Hayman property, the Privalov-Riesz theorems, and doubling measures ». Michigan Mathematical Journal 52, n^o 3 (décembre 2004) : 553–71. http://dx.doi.org/10.1307/mmj/1100623413.

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Li, Hui, Chun Wei et Sheng Wen. « Doubling property of self-affine measures on carpets of Bedford and McMullen ». Indiana University Mathematics Journal 65, n^o 3 (2016) : 833–65. http://dx.doi.org/10.1512/iumj.2016.65.5826.

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Ranjbar-Motlagh, Alireza. « Poincaré inequality for abstract spaces ». Bulletin of the Australian Mathematical Society 71, n^o 2 (avril 2005) : 193–204. http://dx.doi.org/10.1017/s000497270003817x.

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The Poincaré inequality is generalised to metric-measure spaces which support a strong version of the doubling condition. This generalises the Poincaré inequality for manifolds whose Ricci curvature is bounded from below and metric-measure spaces which satisfy the measure contraction property.

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Stanchescu, Yonutz. « On the structure of sets with small doubling property on the plane (I) ». Acta Arithmetica 83, n^o 2 (1998) : 127–41. http://dx.doi.org/10.4064/aa-83-2-127-141.

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Zheng, Jianyu, Wenhui Sun, Wenting Wang, Youwan Tong, Wei-Yu Wang, Xin Wang, Haiqing Yuan, Jianguo Liu et Ninghua Zhu. « Frequency-Doubling OEO Using the Polarization Property of LiNbO₃ Modulator ». IEEE Photonics Technology Letters 27, n^o 17 (1 septembre 2015) : 1864–67. http://dx.doi.org/10.1109/lpt.2015.2443974.

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Wang, Li, et N. D. Kazarinoff. « A metric property of period doubling for nonisosceles trapezoidal maps on an interval ». Advances in Applied Mathematics 8, n^o 2 (juin 1987) : 208–21. http://dx.doi.org/10.1016/0196-8858(87)90014-5.

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Marshall, James. « Fractional Integrals of Imaginary Order Supported on Convex Curves, and the Doubling Property ». Rocky Mountain Journal of Mathematics 28, n^o 1 (mars 1998) : 287–302. http://dx.doi.org/10.1216/rmjm/1181071834.

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Baudoin, Fabrice, Michel Bonnefont et Nicola Garofalo. « A sub-Riemannian curvature-dimension inequality, volume doubling property and the Poincaré inequality ». Mathematische Annalen 358, n^o 3-4 (28 septembre 2013) : 833–60. http://dx.doi.org/10.1007/s00208-013-0961-y.

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Cohen, Nathann. « A Doubling Construction for 3-Uniform Friendship Hypergraphs with the Universal Pairs Property ». Journal of Combinatorial Designs 24, n^o 7 (3 novembre 2015) : 336–39. http://dx.doi.org/10.1002/jcd.21509.

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Hall, WB, GM Mckeon, JO Carter, KA Day, SM Howden, JC Scanlan, PW Johnston et WH Burrows. « Climate Change in Queensland's Grazing Lands : Ii. An Assessment of the Impact on Animal Production From Native Pastures. » Rangeland Journal 20, n^o 2 (1998) : 177. http://dx.doi.org/10.1071/rj9980177.

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The 160 million ha of grazing land in Queensland support approximately 10 million beef equivalents (9.8 million cattle and 10.7 million sheep) with treed and cleared native pastures as the major forage source. The complexity of these biophysical systems and their interaction with pasture and stock management, economic and social forces limits our ability to easily calculate the impact of climate change scenarios. We report the application of a systems approach in simulating the flow of plant dry matter and utilisation of forage by animals. Our review of available models highlighted the lack of suitable mechanistic models and the potential role of simple empirical relationships of utilisation and animal production derived from climatic and soil indices. Plausible climate change scenarios were evaluated by using a factorial of rainfall (f 10%) * 3260C temperature increase * doubling CO, in sensitivity studies at property, regional and State scales. Simulation of beef cattle liveweight gain at three locations in the Queensland black speargrass zone showed that a *lo% change in rainfall was magnified to be a f 15% change in animal production (liveweight gain per ha) depending on location, temperature and CO, change. Models of 'safe' carrying capacity were developed from property data and expert opinion. Climate change impacts on 'safe' carrying capacity varied considerably across the State depending on whether moisture, temperature or nutrients were the limiting factors. Without the effect of doubling CO,, warmer temperatures and +lo% changes in rainfall resulted in -35 to +70% changes in 'safe' carrying capacity depending on location. With the effect of doubling CO, included, the changes in 'safe' carrying capacity ranged from -12 to +115% across scenarios and locations. When aggregated to a whole-of-State carrying capacity, the combined effects of warmer temperature, doubling CO, and +lo% changes in rainfall resulted in 'safe' carrying capacity changes of +3 to +45% depending on rainfall scenario and location. A major finding of the sensitivity study was the potential importance of doubling CO, in mitigating or amplifying the effects of warmer temperatures and changes in rainfall. Field studies on the impact of CO, are therefore a high research priority. Keywords: climate change, Queensland, simulation, rangelands, beef production, cattle, carrying capacity, CO,, utilisation

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Yao, Jiangyan, et Wei Han. « The Existence Result for a Class of p-Kirchhoff-Type Problem with a Multilinear Growth Nonlinearity ». Discrete Dynamics in Nature and Society 2019 (7 juillet 2019) : 1–10. http://dx.doi.org/10.1155/2019/3713909.

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In this paper, we firstly discuss the existence of the least energy sign-changing solutions for a class of p-Kirchhoff-type problems with a (2p-1)-linear growth nonlinearity. The quantitative deformation lemma and Non-Nehari manifold method are used in the paper to prove the main results. Remarkably, we use a new method to verify that Mb≠∅. The main results of our paper are the existence of the least energy sign-changing solution and its corresponding energy doubling property. Moreover, we also give the convergence property of the least energy sign-changing solution as the parameter b↘0.

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Mirotin, A. R. « Hausdorff Operators on Real Hardy Spaces H1 Over Homogeneous Spaces with Local Doubling Property ». Analysis Mathematica 47, n^o 2 (31 mai 2021) : 385–403. http://dx.doi.org/10.1007/s10476-021-0087-5.

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Li, Dongyan. « Singularity and Decay Estimates for a Degenerate Parabolic Equation ». Complexity 2021 (10 mars 2021) : 1–6. http://dx.doi.org/10.1155/2021/5517008.

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In this paper, a degenerate parabolic equation u t − div x θ ∇ u = x a u p with p > 1 and θ < 2 , a ∈ ℝ , is considered. Based on rescaling arguments combined with a doubling property, the space-time singularity and decay estimates are established. Moreover, a universal and a priori bound of global nonnegative solutions for the corresponding initial boundary value problem is derived.

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Tao, Xiangxing, et Qinqin Chen. « The Boundedness of Maximal Functions in Orlicz–Campanato Spaces of Homogeneous Type ». gmj 15, n^o 2 (juin 2008) : 377–88. http://dx.doi.org/10.1515/gmj.2008.377.

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Abstract Let (𝑋,𝑑,μ) be a normal space of homogeneous type, 𝑋+ be the upper half-space equipped with a Carleson measure β, and let Φ be an N-function and φ a suitable function satisfying the doubling property. We prove that the generalized Hardy–Littlewood maximal operator 𝑀 is bounded from the Orlicz–Campanato space 𝐿Φ,φ (𝑋,μ) to 𝐿Φ,φ (𝑋+,β).

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Coulhon, Thierry, Baptiste Devyver et Adam Sikora. « Gaussian heat kernel estimates : From functions to forms ». Journal für die reine und angewandte Mathematik (Crelles Journal) 2020, n^o 761 (1 avril 2020) : 25–79. http://dx.doi.org/10.1515/crelle-2018-0021.

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AbstractOn a complete non-compact Riemannian manifold satisfying the volume doubling property, we give conditions on the negative part of the Ricci curvature that ensure that, unless there are harmonic 1-forms, the Gaussian heat kernel upper estimate on functions transfers to one-forms. These conditions do no entail any constraint on the size of the Ricci curvature, only on its decay at infinity.

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Lin, Haibo, Eiichi Nakai et Dachun Yang. « Boundedness of Lusin-area andgλ*functions on localized Morrey-Campanato spaces over doubling metric measure spaces ». Journal of Function Spaces and Applications 9, n^o 3 (2011) : 245–82. http://dx.doi.org/10.1155/2011/187597.

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Letχbe a doubling metric measure space andρan admissible function onχ. In this paper, the authors establish some equivalent characterizations for the localized Morrey-Campanato spacesερα,p(χ)and Morrey-Campanato-BLO spacesε̃ρα,p(χ)whenα∈(-∞,0)andp∈[1,∞). Ifχhas the volume regularity Property(P), the authors then establish the boundedness of the Lusin-area function, which is defined via kernels modeled on the semigroup generated by the Schrödinger operator, fromερa,p(χ)toε̃ρa,p(χ)without invoking any regularity of considered kernels. The same is true for thegλ*function and, unlike the Lusin-area function, in this case,χis even not necessary to have Property(P). These results are also new even forℝdwith thed-dimensional Lebesgue measure and have a wide applications.

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Han, Yongsheng, Detlef Müller et Dachun Yang. « A Theory of Besov and Triebel-Lizorkin Spaces on Metric Measure Spaces Modeled on Carnot-Carathéodory Spaces ». Abstract and Applied Analysis 2008 (2008) : 1–250. http://dx.doi.org/10.1155/2008/893409.

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We work on RD-spaces𝒳, namely, spaces of homogeneous type in the sense of Coifman and Weiss with the additional property that a reverse doubling property holds in𝒳. An important example is the Carnot-Carathéodory space with doubling measure. By constructing an approximation of the identity with bounded support of Coifman type, we develop a theory of Besov and Triebel-Lizorkin spaces on the underlying spaces. In particular, this includes a theory of Hardy spacesHp(𝒳)and local Hardy spaceshp(𝒳)on RD-spaces, which appears to be new in this setting. Among other things, we give frame characterization of these function spaces, study interpolation of such spaces by the real method, and determine their dual spaces whenp≥1. The relations among homogeneous Besov spaces and Triebel-Lizorkin spaces, inhomogeneous Besov spaces and Triebel-Lizorkin spaces, Hardy spaces, and BMO are also presented. Moreover, we prove boundedness results on these Besov and Triebel-Lizorkin spaces for classes of singular integral operators, which include non-isotropic smoothing operators of order zero in the sense of Nagel and Stein that appear in estimates for solutions of the Kohn-Laplacian on certain classes of model domains inℂN. Our theory applies in a wide range of settings.

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Zhu, Xi Feng, et Quan Fu Gao. « Periodic-Doubling and Hopf Bifurcations of a Two-Degree-of-Freedom System with Elastic Constraints and Clearances ». Advanced Materials Research 1006-1007 (août 2014) : 285–89. http://dx.doi.org/10.4028/www.scientific.net/amr.1006-1007.285.

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Based on the study of a dual component system with elastic constraints, the stability and local bifurcations of the soft-impacts system, such as piecewise property and singularity, was analyzed by using the Poincaré map and Runge-Kutta numerical simulation method. The routes from periodic motions to chaos, via Hopf bifurcation and period-doubling bifurcation, were investigated exactly. In the large constraint stiffness case, the period-doubling and Hopf bifurcation exist in the two-degree-of-freedom system with elastic constraints and clearances. The clearances of the system, stiffness and damping coefficient of the elastic constraints is the main reasons for influencing the chaotic motion. The steady 1-1-1 period orbits or 2-1-1 period orbits will exist within a wideband frequency range and the value of velocity will be higher when appropriate system parameters are chosen.

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Chang, Der-Chen, Shu-Cheng Chang, Yingbo Han et Jingzhi Tie. « A CR Analogue of Yau’s Conjecture on Pseudoharmonic Functions of Polynomial Growth ». Canadian Journal of Mathematics 71, n^o 6 (7 janvier 2019) : 1367–94. http://dx.doi.org/10.4153/cjm-2018-024-3.

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AbstractIn this paper, we first derive the CR volume doubling property, CR Sobolev inequality, and the mean value inequality. We then apply them to prove the CR analogue of Yau’s conjecture on the space consisting of all pseudoharmonic functions of polynomial growth of degree at most $d$ in a complete noncompact pseudohermitian $(2n+1)$-manifold. As a by-product, we obtain the CR analogue of the volume growth estimate and the Gromov precompactness theorem.

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Zhang, Songyan. « The existence and boundedness of square functions on generalized Orlicz–Campanato spaces ». gmj 17, n^o 2 (juin 2010) : 405–21. http://dx.doi.org/10.1515/gmj.2010.019.

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Abstract Let T(ƒ) denote the Littlewood–Paley square operators, including the g-function g(ƒ), Luzin area function S(ƒ) and Stein's function , on the generalized Orlicz–Campanato spaces , where Φ is a N-function satisfying the Δ2 condition and φ a positive function satisfying the doubling property. It is proved that if T(ƒ)(x 0) < ∞ for a single point , then T(ƒ)(x) exists almost everywhere in , and T(ƒ) is bounded on the spaces .

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Björn, Anders, et Daniel Hansevi. « Boundary Regularity for p-Harmonic Functions and Solutions of Obstacle Problems on Unbounded Sets in Metric Spaces ». Analysis and Geometry in Metric Spaces 7, n^o 1 (1 janvier 2019) : 179–96. http://dx.doi.org/10.1515/agms-2019-0009.

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Abstract The theory of boundary regularity for p-harmonic functions is extended to unbounded open sets in complete metric spaces with a doubling measure supporting a p-Poincaré inequality, 1 < p < ∞. The barrier classification of regular boundary points is established, and it is shown that regularity is a local property of the boundary. We also obtain boundary regularity results for solutions of the obstacle problem on open sets, and characterize regularity further in several other ways.

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Hua, Bobo, Jürgen Jost et Shiping Liu. « Geometric analysis aspects of infinite semiplanar graphs with nonnegative curvature ». Journal für die reine und angewandte Mathematik (Crelles Journal) 2015, n^o 700 (1 janvier 2015) : 1–36. http://dx.doi.org/10.1515/crelle-2013-0015.

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AbstractWe apply Alexandrov geometry methods to study geometric analysis aspects of infinite semiplanar graphs with nonnegative combinatorial curvature. We obtain the metric classification of these graphs and construct the graphs embedded in the projective plane minus one point. Moreover, we show the volume doubling property and the Poincaré inequality on such graphs. The quadratic volume growth of these graphs implies the parabolicity. Finally, we prove the polynomial growth harmonic function theorem analogous to the case of Riemannian manifolds.

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Chen, Danfeng, et Cong Wang. « Prediction of Period-Doubling Bifurcation Based on Dynamic Recognition and Its Application to Power Systems ». International Journal of Bifurcation and Chaos 26, n^o 09 (août 2016) : 1650157. http://dx.doi.org/10.1142/s0218127416501571.

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In this paper, a bifurcation prediction approach is proposed based on dynamic recognition and further applied to predict the period-doubling bifurcation (PDB) of power systems. Firstly, modeling of the internal dynamics of nonlinear systems is obtained through deterministic learning (DL), and the modeling results are applied for constructing the dynamic training pattern database. Specifically, training patterns are chosen according to the hierarchical structured knowledge representation based on the qualitative property of dynamical systems, which is capable of arranging the dynamical models into a specific order in the pattern database. Then, a dynamic recognition-based bifurcation prediction approach is suggested. As a result, perturbations implying PDB on the testing patterns can be predicted through the minimum dynamic error between the training patterns and testing patterns by recalling the knowledge restored in the pattern database. Finally, the second-order single-machine to infinite bus power system model is introduced to check the effectiveness of this prediction approach, which implies PDB under small periodic parameter perturbations. The key point that determines the prediction effect mainly lies in two methods: (1) accurate approximation of the unknown system dynamics through DL guarantees the feasibility of the prediction process; (2) the qualitative property of PDB and the generalization ability of DL algorithm ensure the validity of the selected training patterns. Simulations are included to illustrate the effectiveness of the proposed approach.

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Effah-Poku, S., W. Obeng-Denteh et I. K. Dontwi. « A Study of Chaos in Dynamical Systems ». Journal of Mathematics 2018 (2018) : 1–5. http://dx.doi.org/10.1155/2018/1808953.

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The behavior of systems such as periodicity, fixed points, and most importantly chaos has evolved as an integral part of mathematics, especially in dynamical system. This research presents a study on chaos as a property of nonlinear science. Systems with at least two of the following properties are considered to be chaotic in a certain sense: bifurcation and period doubling, period three, transitivity and dense orbit, sensitive dependence to initial conditions, and expansivity. These are termed as the routes to chaos.

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An, Cun-bin, Jiangyan Yao et Wei Han. « The Existence of the Sign-Changing Solutions for the Kirchhoff-Schrödinger-Poisson System in Bounded Domains ». Advances in Mathematical Physics 2020 (19 mai 2020) : 1–10. http://dx.doi.org/10.1155/2020/8254898.

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In this paper, we study a class of the Kirchhoff-Schrödinger-Poisson system. By using the quantitative deformation lemma and degree theory, the existence result of the least energy sign-changing solution u0 is obtained. Meanwhile, the energy doubling property is proved, that is, we prove that the energy of any sign-changing solution is strictly larger than twice that of the least energy. Moreover, we also get the convergence properties of u0 as the parameters b↘0 and λ↘0.

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Grigor'yan, Alexander, et Jiaxin Hu. « Heat Kernels and Green Functions on Metric Measure Spaces ». Canadian Journal of Mathematics 66, n^o 3 (1 juin 2014) : 641–99. http://dx.doi.org/10.4153/cjm-2012-061-5.

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AbstractWe prove that, in a setting of local Dirichlet forms on metric measure spaces, a two-sided sub-Gaussian estimate of the heat kernel is equivalent to the conjunction of the volume doubling property, the elliptic Harnack inequality, and a certain estimate of the capacity between concentric balls. The main technical tool is the equivalence between the capacity estimate and the estimate of a mean exit time in a ball that uses two-sided estimates of a Green function in a ball.

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Mahoney, Murray W., Christian B. Fuller, William H. Bingel et Michael Calabrese. « Friction Stir Processing of Cast NiAl Bronze ». Materials Science Forum 539-543 (mars 2007) : 3721–26. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.3721.

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Friction stir processing (FSP) of cast NiAl bronze has resulted in significant increases in properties including more than doubling the yield greater that 40 percent increase in the threshold fatigue life; all achieved while increasing ductility. These and other strength, greater than a 60 percent increase in tensile strength, and property improvements were realized following studies of FSP procedures specifically for NiAl bronze. Within this manuscript, FSP procedures and other “lessons learned” are presented. Details of property improvements are documented elsewhere within this conference proceedings (see Fuller et al.). Presented herein are tool designs for efficient material flow, tool materials capable of long life at 1000°C, rastering procedures covering large surface areas, and other results pertinent to achieve improved properties in cast NiAl bronze following friction stir processing.

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Georgiadis, Athanasios G., et George Kyriazis. « Embeddings between Triebel-Lizorkin Spaces on Metric Spaces Associated with Operators ». Analysis and Geometry in Metric Spaces 8, n^o 1 (1 janvier 2020) : 418–29. http://dx.doi.org/10.1515/agms-2020-0120.

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Abstract We consider the general framework of a metric measure space satisfying the doubling volume property, associated with a non-negative self-adjoint operator, whose heat kernel enjoys standard Gaussian localization. We prove embedding theorems between Triebel-Lizorkin spaces associated with operators. Embeddings for non-classical Triebel-Lizorkin and (both classical and non-classical) Besov spaces are proved as well. Our result generalize the Euclidean case and are new for many settings of independent interest such as the ball, the interval and Riemannian manifolds.

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Li, Ziwei, Dachun Yang et Wen Yuan. « Lebesgue Points of Besov and Triebel–Lizorkin Spaces with Generalized Smoothness ». Mathematics 9, n^o 21 (27 octobre 2021) : 2724. http://dx.doi.org/10.3390/math9212724.

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In this article, the authors study the Lebesgue point of functions from Hajłasz–Sobolev, Besov, and Triebel–Lizorkin spaces with generalized smoothness on doubling metric measure spaces and prove that the exceptional sets of their Lebesgue points have zero capacity via the capacities related to these spaces. In case these functions are not locally integrable, the authors also consider their generalized Lebesgue points defined via the γ-medians instead of the classical ball integral averages and establish the corresponding zero-capacity property of the exceptional sets.

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Ndayiragije, Juvénal. « Strengthening PF ». Linguistic Inquiry 31, n^o 3 (juillet 2000) : 485–512. http://dx.doi.org/10.1162/002438900554415.

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One standard assumption of the Minimalist Program is that formal, (grammatical) features are the only features that trigger the “dislocation” property of CHL. On the basis of two syntactically related properties of Fóngbé nonfinite clauses-object shift and verb doubling-I argue that pure phonological features can be overtly attracted. Three consequences follow: (a) the operation Attract F cannot be reduced to, Agree, (b) the concept of strength is inescapable, and (c) some of the effects of strength are PF-driven properties, hence not true imperfections.

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