Results 91 to 100 of about 16,555,549 (335)
A Geometric Characterization of Certain First Integrals for Nonholonomic Systems with Symmetries [PDF]
, 2015 We study the existence of first integrals in nonholonomic systems with symmetry. First we define the concept of $\mathcal{M}$-cotangent lift of a vector field on a manifold $Q$ in order to unify the works [Balseiro P., Arch. Ration. Mech. Anal. 214 (2014)
P. Balseiro, N. Sansonetto
semanticscholar +1 more source
Journal of Mathematical Analysis and Applications, 2005 The authors consider properties of first return integrals of real functions defined on the unit interval. First-return integrals are shown to be continuous but not absolutely continuous.
Csörnyei, Marianna +3 more
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Pediatric Blood &Cancer, EarlyView.ABSTRACT Background Families of children with cancer experience significant financial strain, even with universal healthcare. Indirect costs, such as productivity losses and non‐medical expenses, are rarely included in economic evaluations, and little is known about how effectively financial aid programmes alleviate this burden. Childhood brain tumours
Megumi Lim +8 more
wiley +1 more source
Chiellini Hamiltonian Lienard differential systems
Electronic Journal of Differential Equations, 2019 We characterize the centers of the Chiellini Hamiltonian Lienard second-order differential equations $x'=y$, $y'=-f(x) y -g(x)$ where $g(x)=f(x) (k - \alpha (1 +\alpha) \int f(x) dx )$ with $\alpha, k \in \mathbb{R}$.
Jaume Gine, Jaume Llibre, Claudia Valls
doaj
Pediatric Blood &Cancer, EarlyView.ABSTRACT Background The management of clinically apparent single lesions or oligofocal nephroblastomatosis, a facultative precursor of nephroblastoma, remains debated. Methods We retrospectively analyzed 37 patients with clinically apparent single or oligofocal nephroblastomatosis (two to three lesions per kidney) among 2347 patients registered between
Nils Welter +17 more
wiley +1 more source
Symmetry, Integrability and Geometry: Methods and Applications, 2013 The linearization problem for nonlinear second-order ODEs to the Laguerre form by means of generalized Sundman transformations (S-transformations) is considered, which has been investigated by Duarte et al. earlier.
M. Tahir Mustafa +2 more
doaj +1 more source
Polynomial constants of motion for Calogero-type systems in three dimensions
, 2010 We give an explicit and concise formula for higher-degree polynomial first integrals of a family of Calogero-type Hamiltonian systems in dimension three. These first integrals, together with the already known ones, prove the maximal superintegrability of
Chanu, Claudia +2 more
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Pediatric Blood &Cancer, EarlyView.ABSTRACT Background PIK3CA‐related overgrowth spectrum (PROS) includes several rare overgrowth disorders resulting from somatic gain‐of‐function mutations in PIK3CA. Despite treatment advances, including the recent approval of alpelisib for PROS in the United States, literature detailing the patient experience with PROS is limited.
Vamsi Bollu +8 more
wiley +1 more source
Preserving multiple first integrals by discrete gradients
, 2011 We consider systems of ordinary differential equations with known first integrals. The notion of a discrete tangent space is introduced as the orthogonal complement of an arbitrary set of discrete gradients.
Dahlby, Morten +2 more
core +1 more source
First-Order Patterns for Information Integration [PDF]
, 2005 Advanced inter-enterprise applications operate in an environment that changes rapidly as autonomous services dynamically join and leave a community of interest at will. Well-designed integrated information views simplify inter-enterprise application development by hiding details of data distribution, extraction, filter and transformation from inter ...
Mark A. Cameron, Kerry L. Taylor
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