Results 31 to 40 of about 1,422 (148)

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, Yu, Pei, Liu, Yirong, Liu, Yuanyuan   +3 more
openaire   +3 more sources

Fracture evolution of a thick soft protection layer and the water inrush mechanism in overburden under longwall mining

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, Wei Qiao, Xianggang Cheng, Xiangsheng Meng, Peichao Feng   +4 more
wiley   +1 more source

Anisotropic NMR as a Crucial Tool for Differentiation of Epimers With High Conformational Flexibility

Angewandte Chemie, Volume 138, Issue 30, 20 July 2026.
Epimer discrimination remains challenging due to subtle NMR differences. Here, we propose a methodology based on 13C‐RCSA and RDC anisotropic parameters, enabling the assignment of two flexible tetraprenyltoluquinol epimers (1a and 1b) with remote stereoclusters.
Juan Carlos C. Fuentes‐Monteverde, Abel M. Forero, Nilamoni Nath, Antonio Hernández Daranas, Carlos Jiménez, Jaime Rodríguez, Christian Griesinger   +6 more
wiley   +2 more sources

Mechanical and Dielectric Properties of Epoxy Resin Composites Filled With Whole‐Panel Waste From First and Second Generation End‐of‐Life Photovoltaic Panels

Polymer Engineering &Science, EarlyView.
End‐of‐life photovoltaic (PV) panels are reduced into fine particles and incorporated into epoxy composites, enabling sustainable energy‐storage materials with enhanced dielectric performance. The resulting composites achieve up to 25% increased energy storage capacity at 30°C and up to 45× improvement at elevated temperatures, promoting low‐cost ...
Charalampos Pavlopoulos, Konstantina Papadopoulou, Anastasios C. Patsidis, Dionisis Semitekolos, Anestis A. Vlysidis, Georgios C. Psarras, Loukas Zoumpoulakis, Gerasimos Lyberatos   +7 more
wiley   +1 more source

Centers and Isochronous Centers for Two Classes of Generalized Seventh and Ninth Systems [PDF]

Journal of Dynamics and Differential Equations, 2010
We classify new classes of centers and of isochronous centers for polynomial differential systems in R2 of arbitrary odd degree d ≥ 7 that in complex notation z = x + iy can be written as z˙=(λ+i)z+(zz)d-7-2j/2 (Az5+jz2+j+Bz4+jz3+j+Cz3+jz4+j+Dz7+2j), where j is either 0 or 1, λ ∈ R and A,B,C ∈ C. Note that if j = 0 and d = 7 we obtain a special case of
Llibre, Jaume, Valls, Clàudia
openaire   +3 more sources

Rounded Monodisperse Fluorescent Nanodiamonds

Small, EarlyView.
Nanodiamond (ND) shape control using rapid molten‐nitrate etching is studied as a scale‐up method for monodispersed rounded particles. Optimal etching condition (567°C for 6 min) yields NDs with atomically stepped surfaces and reduced sp2 content. Compared to angular control, rounded NDs exhibit an increased proportion of luminescent particles (66% vs.
Helena Raabova, Ivan Rehor, Jan Havlik, Stuart Turner, Jan Stursa, Vladimira Petrakova, Michal Gulka, Petr Cigler   +7 more
wiley   +1 more source

Temporal and Spatial Organization in Collaborative Work by Nurses in an Emergency and Critical Care Center

Symbolic Interaction, EarlyView.
This study describes the work at an emergency and critical care center, focusing on the collaboration of multiple nurses when moving patients from the outpatient department to the ward. This study is an ethnomethodological ethnography based on fieldwork at a hospital and analysis of video data. The patient transport process is temporally organized into
Hiroki Maeda, Yumi Nishimura
wiley   +1 more source

On the critical periods of perturbed isochronous centers

Journal of Differential Equations, 2007
"Vegeu el resum a l'inici del document del fitxer adjunt".
Gasull, Armengol, Yu, Jiang, Centre de Recerca Matemàtica   +2 more
openaire   +4 more sources

Isochronicity of centers in a switching Bautin system

Journal of Differential Equations, 2012
Isochronicity of centers for a class of discontinuous differential system, simply called switching system, is discussed. Some sufficient conditions for the system to have a regular isochronous center at the origin are given and a switching system with an irregular isochronous center at the origin is constructed.
Chen, Xingwu, Zhang, Weinian
openaire   +2 more sources

Invasive Assessment of Right Ventricular Dysfunction Predicts Periprocedural Outcomes in Patients Undergoing Unplanned Ventricular Tachycardia Ablation

Journal of Cardiovascular Electrophysiology, EarlyView.
Displays bar graphs showing outcome rates stratified by clinical and hemodynamic variables. Asterisks (*) denote statistically significant differences (p ≤ 0.05). “NS” indicates non‐significant comparisons. Percentages are shown above each bar. The top panel corresponds to acute kidney injury (blue bars), and the bottom panel corresponds to acute ...
Tess Calcagno, Sai Prasad Ramachandran, V. Karthik, Mendpara Vaidehi, Andrew Cesmat, Joseph Sipko, Bryan Baranowski, Mandeep Bhargava, Thomas D. Callahan, Mina K. Chung, Thomas Dresing, Ayman A. Hussein, Mohamed Kanj, Arshneel Kochar, David O. Martin, Walid I. Saliba, Tyler L. Taigen, Niraj Varma, Koji Higuchi, Justin Z. Lee, Oussama M. Wazni, Andres Carmona Rubio, Pasquale Santangeli, Jakub Sroubek   +23 more
wiley   +1 more source