Results 101 to 110 of about 633,701 (344)

Secure Chaotic Map Based Block Cryptosystem with Application to Camera Sensor Networks

Sensors, 2011
Recently, Wang et al. presented an efficient logistic map based block encryption system. The encryption system employs feedback ciphertext to achieve plaintext dependence of sub-keys.
Muhammad Khurram Khan, Khaled Alghathbar, Xianfeng Guo, Jiashu Zhang   +3 more
doaj   +1 more source

Bifurcation and Chaotic Behavior of Duffing System with Fractional-Order Derivative and Time Delay [PDF]

, 2023
Cuiyan Wang, Meiqi Wang, Wuce Xing, S. Shi   +3 more
openalex   +1 more source

Chaotic Scattering on Individual Quantum Graphs

, 2013
For chaotic scattering on quantum graphs, the semiclassical approximation is exact. We use this fact and employ supersymmetry, the colour-flavour transformation, and the saddle-point approximation to calculate the exact expression for the lowest and ...
Pluhar, Z., Weidenmüller, H. A.
core   +1 more source

Shannon Entropy of Gray Matter Eigenmodes: A Novel Biomarker for Alzheimer's Disease and Heterogeneous MCI Trajectories

Advanced Science, EarlyView.
Entropy derived from gray matter eigenmodes captures cortical disorganization in Alzheimer's disease. Using multimodal MRI and amyloid‐PET data, this novel structure–function coupling biomarker enables accurate classification of clinical stages, predicts Aβ burden, and stratifies mild cognitive impairment subtypes.
Yumeng Li, Gaoping Long, Xinyue Zhang, Kewei Chen, Xin Li, Zhanjun Zhang   +5 more
wiley   +1 more source

Chaotic dark matter

Physical Review D, 1992
A very weakly coupled scalar field with mass $m$ and initial vacuum expectation value $V$ will provide enough mass to close the universe provided $V\simeq (3\times 10^8\gev)(100\gev/m)^{1/4}$. We discuss possible models in which such a field could arise.
Rangarajan, R., Srednicki, M.
openaire   +3 more sources

Optimum PID Control of Multi-wing Attractors in A Family of Lorenz-like Chaotic Systems

, 2012
Multi-wing chaotic attractors are highly complex nonlinear dynamical systems with higher number of index-2 equilibrium points. Due to the presence of several equilibrium points, randomness of the state time series for these multi-wing chaotic systems is ...
Acharya, Anish, Das, Saptarshi, Pan, Indranil   +2 more
core   +1 more source

A Virtual Clinical Trial of Psychedelics to Treat Patients With Disorders of Consciousness

Advanced Science, EarlyView.
Disorders of consciousness after severe brain injury are marked by reduced complexity of brain activity and limited treatment options. Using personalized whole‐brain models, this study shows that simulated lysergic acid diethylamide (LSD) and psilocybin shift patient brain dynamics closer to criticality.
Naji L.N. Alnagger, Paolo Cardone, Charlotte Martial, Yonatan Sanz Perl, Iván Mindlin, Jacobo D Sitt, Leor Roseman, Robin Carhart‐Harris, David Nutt, Pablo Mallaroni, Natasha Mason, Johannes G Ramaekers, Vincent Bonhomme, Steven Laureys, Gustavo Deco, Olivia Gosseries, Pablo Núñez, Jitka Annen   +17 more
wiley   +1 more source

Modulated Radio Frequency Stealth Waveforms for Ultra-Wideband Radio Fuzes

Entropy
The increasingly complex electromagnetic environment of modern warfare and the proliferation of intelligent jamming threaten to reduce the survival rate of radio fuzes on the battlefield.
Kaiwei Wu, Bing Yang, Shijun Hao, Yanbin Liang, Zhonghua Huang   +4 more
doaj   +1 more source

A New Nine-Dimensional Chaotic Lorenz System with Quaternion Variables: Complicated Dynamics, Electronic Circuit Design, Anti-Anticipating Synchronization, and Chaotic Masking Communication Application

Mathematics, 2019
In this paper, a chaotic quaternion autonomous nonlinear structure is introduced and intends to be a contribution. It is the first nonlinear dynamical system with quaternion variables to be studied in the literature.
Emad E. Mahmoud, M. Higazy, Turkiah M. Al-Harthi   +2 more
doaj   +1 more source

Estimating Lyapunov exponents in billiards

, 2019
Dynamical billiards are paradigmatic examples of chaotic Hamiltonian dynamical systems with widespread applications in physics. We study how well their Lyapunov exponent, characterizing the chaotic dynamics, and its dependence on external parameters can ...
Datseris, George, Fleischmann, Ragnar, Hupe, Lukas   +2 more
core   +1 more source