Results 31 to 40 of about 4,619,884 (143)
Yuanzineng kexue jishuIsochronous cyclotrons hold an indispensable position in national security and the science and technology innovation system. In the new era, there is an urgent demand for breakthroughs in compact structure, high energy, and high beam intensity of ...
ZHANG Tianjue, FU Wei, WANG Chuan, YIN Zhiguo, JIA Xianlu, AN Shizhong, LI Pengzhan, ZHOU Hongji, SONG Guofang, CHEN Xinyu
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Integrability and Pseudo-Linearizable Conditions in a Quasi-Analytic System
Abstract and Applied Analysis, 2012 This paper deals with the problems of integrability and linearizable conditions at degenerate singular point in a class of quasianalytic septic polynomial differential system.
Feng Li, Yusen Wu
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Isochronous oscillations for cubic systems
, 2018 Planar vector fields? = -y + P?(x,y)? = x + q?(x, y).with a center non necessarily at the origin are considered, where p? and q? are homogeneous polynomials of degree 3. We are concerned with the behavior of the periods of the periodic solutions near the
Guiñez, Víctor +2 more
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Tribenzotriquinacene Fused Dimers (“Fusodimers”)—Synthesis and Host–Guest Properties
Chemistry – A European Journal, EarlyView.Two tribenzotriquinacene units merged with each other in either syn‐ or anti‐orientation of the bowls have become accessible in a short synthesis. In contrast to the anti‐isomer, the syn‐isomer forms 1:1 host–guest complexes with both C60 and C70 in solution and in the solid state, as shown by 1H NMR spectroscopy and x‐ray diffraction.
Chun‐Fai Ng +5 more
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A global isochronous center is linear
, 2021 Let $X$ be a polynomial vector field in $\mathbb{R}^2$ which, after one-point compactification of the plane, has a punctured neighbourhood $\dot U$ of the point at infinity which is foliated by closed orbits of $X$. If the period function of $X$ in $\dot U$ is bounded from below by a positive constant, $X$ is necessarily linear, hence conjugated, up to
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Center-focus and isochronous center problems for discontinuous differential equations
Discrete and Continuous Dynamical Systems, 2000 The authors study planar systems with a line of discontinuities. They use a geometrical proof to show a relation between the order of degeneracy of the critical point (\((m,k)\)-monodromic point) of the discontinuous differential equations and the degeneracy of the associated two smooth component differential equations.
Coll, B., Gasull, A., Prohens, R.
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A Geometric Characterization of Steady Laminar Flow
Communications on Pure and Applied Mathematics, EarlyView.ABSTRACT We study the steady states of the Euler equations on the periodic channel or annulus. We show that if these flows are laminar (layered by closed non‐contractible streamlines which foliate the domain), then they must be either parallel or circular flows.
Theodore D. Drivas, Marc Nualart
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Centers and isochronous centers of a class of quasi-analytic switching systems
Science China Mathematics, 2018 In this paper, we study the integrability and linearization of a class of quadratic quasi-analytic switching systems. We improve an existing method to compute the focus values and periodic constants of quasi-analytic switching systems. In particular, with our method, we demonstrate that the dynamical behaviors of quasi-analytic switching systems are ...
Li, Feng +3 more
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Deep Underground Science and Engineering, EarlyView.Through shear–tensile creep tests and viscoelastic modeling, the fracture evolution of thick soft protective layers is clarified. Results show thickness‐dependent rheological failure modes that govern four types of roof water inrush, providing a mechanism‐based framework for hazard prediction and control. Abstract In the Jurassic coal‐bearing strata of
Mengnan Liu +4 more
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An isochronous lattice for PEP [PDF]
, 1991 With e{sup +}e{sup {minus}} storage rings operating in a quasi- isochronous mode, it might be possible to produce short bunches with length {sigma}{sub z} < 1 cm.
Corbett, W.J. +2 more
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