Results 41 to 50 of about 2,168 (155)

Spatial distribution of health risk assessment of a drinking water reservoir exposed to urban agglomeration and industrial lead contamination in Istanbul, Türkiye

Water Environment Research, Volume 97, Issue 2, February 2025.
The contents of 12 PTEs in the surface water of the dam lake were compared. Ecological risk indices and GIS‐based maps were used to assess stochastic health risks of PTEs. Factor/cluster and correlation analyses were conducted for source identification of PTEs.
Hüseyin Cüce, Erkan Kalipci, Fikret Ustaoğlu, Mehmet Ali Dereli, Seda Alkaya, Aysun Türkmen   +5 more
wiley   +1 more source

Adaptive Detection of Instabilities: An Experimental Feasibility Study

, 2002
We present an example of the practical implementation of a protocol for experimental bifurcation detection based on on-line identification and feedback control ideas.
Anderson, Doedel, Eaton, G Flätgen, I.G Kevrekidis, J.S Anderson, K Krischer, Kim, Makeev, Omberg, R Rico-Martı́nez, Rössler, Theodoropoulos, Wang, Wiesenfeld, Wiesenfeld, Ziegler   +16 more
core   +1 more source

A Multiparameter Singular Perturbation Analysis of the Robertson Model

Studies in Applied Mathematics, Volume 154, Issue 2, February 2025.
ABSTRACT The Robertson model describing a chemical reaction involving three reactants is one of the classical examples of stiffness in ODEs. The stiffness is caused by the occurrence of three reaction rates k1,k2,${k}_{1},{k}_{2},$ and k3,${k}_{3},$ with largely differing orders of magnitude, acting as parameters.
Lukas Baumgartner, Peter Szmolyan
wiley   +1 more source

Bifurcation Dynamics and Complex Behavior in a Discrete‐Time Predator–Prey Model With Cross‐Species Interaction Incorporating Holling Type‐II Response

Complexity, Volume 2025, Issue 1, 2025.
We investigate the nonlinear dynamics of a discrete‐time predator–prey model governed by a Holling Type‐II functional response. Starting from a biologically motivated continuous‐time system, we derive its discrete analogue via the explicit Euler method and employ nondimensionalization to reduce the number of parameters.
Muhammad Rafaqat, Syed Tauseef Saeed, Salman Saleem, Feyisa Edosa Merga, Xinzhi Liu   +4 more
wiley   +1 more source

Quasi-exactly solvable quartic: real algebraic spectral locus

, 2011
We describe the real quasi-exactly solvable spectral locus of the PT-symmetric quartic using the Nevanlinna parametrization.Comment: 17 pages, 11 ...
Alexandersson P, Alexandre Eremenko, Andrei Gabrielov, Bender C, Eremenko A, Eremenko A, Eremenko A, Shin K C, Sibuya Y, Volkovyski L   +9 more
core   +4 more sources

Groundwater Quality and Appropriateness for Drinking and Agriculture Purposes Using Water Quality Indices and Multivariate Statistical Analysis in Kombolcha City, Ethiopia

Geofluids, Volume 2025, Issue 1, 2025.
The study used an integrated method of water quality indices (WQIs) and multivariate statistical analysis to evaluate the hydrogeochemical characteristics of groundwater samples and their appropriateness for drinking and agricultural applications in Kombolcha City.
Nurye Mohammed, Kidest Tadesse, Tamru Tesseme Aragaw, Shankar Karuppannan, Senpathi Venkatramanan   +4 more
wiley   +1 more source

Non-degenerate umbilics, the path formulation and gradient bifurcation problems [PDF]

, 2004
Parametrised contact-equivalence is successful for the understanding and classification of the qualitative local behaviour of bifurcation diagrams and their perturbations. Path formulation is an alternative point of view.
Furter, JE, Sitta, AM
core  

Memory difference control of unknown unstable fixed points: Drifting parameter conditions and delayed measurement

, 2006
Difference control schemes for controlling unstable fixed points become important if the exact position of the fixed point is unavailable or moving due to drifting parameters.
A. W. Hübler, Alexander Piel, E. Ott, H. G. Schuster, H. G. Schuster, H. G. Schuster, Heinz Georg Schuster, Jens Christian Claussen, K. Pyragas, L. O. Chua, L. O. Chua, S. Bielawski, T. Matsumoto, T. Matsumoto, Thorsten Mausbach, W. Just   +15 more
core   +1 more source

Optimization Method for Decoupled Dual‐Platform Parallel Mechanism Integrating Radial Basis Function Neural Networks and Multobjective Particle Swarm Optimization

Journal of Robotics, Volume 2025, Issue 1, 2025.
With growing demands for machining large‐scale complex components in aerospace and marine engineering, conventional processing methods face bottlenecks, including insufficient rigidity, error accumulation, and limited flexibility. Parallel mechanisms (PMs), with their high stiffness and dynamic pose reconfiguration capability, provide critical ...
Yang Qi, Hong Wang, Jinhan Yang, Sreeja Dattachoudhury   +3 more
wiley   +1 more source

The physics of exceptional points

, 2012
A short resume is given about the nature of exceptional points (EPs) followed by discussions about their ubiquitous occurrence in a great variety of physical problems. EPs feature in classical as well as in quantum mechanical problems.
Heiss, W. D.
core   +1 more source