FonT, Jul 19, 2019. https://flashontrack.blogspot.com/2019/07/life-simmetrico-purtuttavia-caotico.html
Also
keyword 'chaos' | 'chaotic' in Font
keyword 'caos' | 'caotico' in Notes (quasi-stochastic poetry)
Visualizzazione post con etichetta chaos. Mostra tutti i post
Visualizzazione post con etichetta chaos. Mostra tutti i post
sabato 29 gennaio 2022
lunedì 27 dicembre 2021
# gst: reshaping Kuramoto model, when a collective dynamics becomes chaotic, with a surprisingly weak coupling.
<< The emergence of collective synchrony from an incoherent state is a phenomenon essentially described by the Kuramoto model (..) Collective synchronization is a phenomenon in which an ensemble of heterogeneous, self-sustained oscillatory units (commonly known as oscillators) spontaneously entrain their rhythms. This is a pervasive phenomenon observed in natural systems and man-made devices, covering a wide range of spatio-temporal scales, from cell aggregates to swarms of fireflies >>
<< However, this is only partly true, (..) Kuramoto’s perturbative phase-reduction approach is valid for weak coupling. Specifically, oscillator heterogeneity and interactions appear at zeroth and linear orders in the coupling constant, respectively. >>
AA << have introduced the ‘enlarged Kuramoto model’; a population of phase oscillators in which three-body interactions enter in a perturbative way. Remarkably, this makes a world of difference, drastically reshaping the traditional Kuramoto scenario. The ‘enlarged Kuramoto model’ exhibits a variety of unsteady states, including collective chaos and hyperchaos. >>
Ivan Leon, Diego Pazo. Enlarged Kuramoto Model: Secondary Instability and Transition to Collective Chaos. arXiv: 2112.00176v1 [nlin.AO]. Nov 30, 2021.
Also
More on the three-body problem (695 families of collisionless orbits). FonT. Oct 16, 2017.
Keywords: gst, behav, instability, Kuramoto model, three-body interactions, chaos, collective chaos, hyperchaos.
mercoledì 1 dicembre 2021
# gst: small-scale random perturbations, Arnold's cat spontaneously stochastic
<< Multi-scale systems (..) may possess a fascinating property of spontaneous stochasticity: a small-scale initial uncertainty develops into a randomly chosen largescale state in a finite time, and this behavior is not sensitive to the nature and magnitude of uncertainty (..). >>
A << intriguing form is the Eulerian spontaneous stochasticity (ESS) of the velocity field itself: an infinitesimal small-scale noise triggers stochastic evolution of velocity field at finite scales and times. >>
AA << prove that a formally deterministic system with scaling symmetry yields a stochastic process with Markovian properties if it is regularized with a vanishing small-scale random perturbation. Besides its significance for understanding turbulence, (their) model extends the phenomenon of ESS beyond the scope of fluid dynamics: (AA) discuss a prototype of a feasible experiment for observing ESS in optics or electronics, as well as potential applications in other physical systems.>>
Alexei A. Mailybaev, Artem Raibekas. Spontaneously stochastic Arnold's cat. arXiv:2111.03666v1 [nlin.CD]. Nov 5, 2021.
keywords: gst, Arnold's cat, randomness, stochasticity, spontaneous stochasticity, small-scale random perturbations, noise, turbulence, chaos
lunedì 11 ottobre 2021
# gst: intermittent large-intensity pulses (LIE) due to instabilities in quasiperiodic motion (in Zeeman laser)
AA << report intermittent large-intensity pulses that originate in Zeeman laser due to instabilities in quasiperiodic motion, >>
<< one route follows torus-doubling to chaos and another goes via quasiperiodic intermittency in response to variation in system parameters. >>
<< During quasiperiodic intermittency, the temporal evolution of the laser shows intermittent chaotic bursting episodes intermediate to the quasiperiodic motion instead of periodic motion >>
<< The intermittent bursting appears as occasional large-intensity events (LIE). In particular, this quasiperiodic intermittency has not been given much attention so far from the dynamical system perspective, in general. >>
S. Leo Kingston, Arindam Mishra, Marek Balcerzak, Tomasz Kapitaniak, Syamal K. Dana. Instabilities in quasiperiodic motion lead to intermittent large-intensity events in Zeeman laser. arXiv: 2109.11847v1 [nlin.CD]. Sep 24, 2021.
keywords: gst, quasiperiodic motion, intermittency, quasiperiodic intermittency, instability, chaos.
mercoledì 6 ottobre 2021
# gst: apropos of disorder & fluctuations
a 'synthetic disorder & fluctuations' from these two blogs ...
keyword 'disorder' in FonT
keyword 'disordine' in Notes (quasi-stochastic poetry)
keyword 'error' | 'fuzzy' | 'noise' in FonT
keywords 'errore' | 'errori' in Notes (quasi-stochastic poetry)
keyword 'caos' | 'caotico' in Notes (quasi-stochastic poetry)
keyword 'waves' in FonT
keyword 'onda' in Notes
(quasi-stochastic poetry)
keyword 'gst' (General Sistem Theory) in FonT
mercoledì 22 settembre 2021
# gst: stagnation points controlling the onset and strength of chaotic fluctuations (in viscoelastic porous media flows)
<< Viscoelastic porous media flows become chaotic beyond critical flow conditions, impacting processes including enhanced oil recovery and targeted drug delivery. Understanding how geometric details of the porous medium affect the onset and strength of the chaotic flows can lead to fundamental insights and potential optimization of such processes. Recently, it has been argued that geometric disorder in the medium suppresses chaotic fluctuations. In contrast, (AA) demonstrate that disorder can also significantly enhance fluctuations given a different originally ordered configuration. (AA) show that the occurrence of stagnation points in the flow field is the vital factor controlling the onset and strength of fluctuation, providing a general and intuitive understanding of how pore geometry affects this important class of complex viscoelastic flows. >>
Simon J. Haward, Cameron C. Hopkins, Amy Q. Shen. Stagnation points control chaotic fluctuations in viscoelastic porous media flow. PNAS. 118 (38) e2111651118. doi: 10.1073/ pnas.2111651118. Sep 21, 2021.
Also
keyword 'elastic' | 'turbulence' | 'disorder' in FonT
keyword 'elastico' | 'turbolento' | 'disordine' in Notes
(quasi-stochastic poetry)
keywords: viscoelastic flows, porous media, stagnation, elastic turbulence, chaos, chaotic fluctuations, geometric disorder.
venerdì 17 settembre 2021
# gst: apropos of transitions: effects of random waves interacting with a coherent structure
<< Solitary waves interacting with random (..) waves (..) are studied. Two opposing types of dynamics are identified: First, the random thermal waves can erode the solitary wave; second, this structure can grow as a result of this interaction. These two types of behavior depend on a dynamical property of the solitary wave (its angular frequency), and on a statistical property of the thermal waves (the chemical potential). >>
<< Either process leads to an increase of the wave entropy. >>
Yuanting Chen, Benno Rumpf. Growth or decay of a coherent structure interacting with random waves. Phys. Rev. E 104, 034213. Sep 15, 2021.
Also
keyword 'waves' in FonT
keyword 'onda' in Notes (quasi-stochastic poetry)
giovedì 29 luglio 2021
# life: apropos of fuzzy cooperation, Ralph fuzzy mixture vs. world fuzzy dance ...
<< In 2013, the American virologist Ralph Baric approached Zhengli Shi at a meeting. Baric was a top expert in coronaviruses, with hundreds of papers to his credit, and Shi, along with her team at the Wuhan Institute of Virology, had been discovering them by the fistful in bat caves. In one sample of bat guano, Shi had detected the genome of a new virus, called SHC014, that was one of the two closest relatives to the original SARS virus, but her team had not been able to culture it in the lab. >>️
<< Baric had developed a way around that problem—a technique for “reverse genetics” in coronaviruses. Not only did it allow him to bring an actual virus to life from its genetic code, but he could mix and match parts of multiple viruses. He wanted to take the “spike” gene from SHC014 and move it into a genetic copy of the SARS virus he already had in his lab. The spike molecule is what lets a coronavirus open a cell and get inside it. The resulting chimera would demonstrate whether the spike of SHC014 would attach to human cells. >>️
<< Just as when you trade in part of a poker hand for fresh cards, there was no way of knowing whether the final chimeras would be stronger or weaker. >>
<< If you study a hundred different bat viruses, your luck may run out. >> Ralph Baric.
<< In 2014, the NIH awarded a five-year, $3.75 million grant to EcoHealth Alliance to study the risk that more bat-borne coronaviruses would emerge in China, using the same kind of techniques Baric had pioneered. Some of that work was to be subcontracted to the Wuhan Institute of Virology. >>
<< Consider this hypothetical scenario, (..) An important gain-of-function experiment involving a virus with serious pandemic potential is performed in a well-regulated, world-class laboratory by experienced investigators, but the information from the experiment is then used by another scientist who does not have the same training and facilities and is not subject to the same regulations. In an unlikely but conceivable turn of events, what if that scientist becomes infected with the virus, which leads to an outbreak and ultimately triggers a pandemic >> Anthony Fauci (director of the NIH’s National Institute of Allergy and Infectious Diseases) (2012).
️
<< Paul’s grilling of Fauci brought new scrutiny to the relationship between Ralph Baric’s lab at UNC and Zhengli Shi’s at WIV, with some narratives painting Baric as the Sith master of SARS and Shi as his ascendant apprentice. They did share resources—for example, Baric sent the transgenic mice with human lung receptors to Wuhan. >>
️
<< During a hearing on May 11, 2021, Senator Rand Paul confronted Anthony Fauci over funding of bat-virus research by the National Institutes of Health. >>️
<< The NIH has still not fully explained its decision-making and did not reply to questions. Citing a pending investigation, it has declined to release copies of the grant that sent the Wuhan institute about $600,000 between 2014 and 2019. It has also revealed little about its new system for assessing gain-of-function risks, which is carried out by an anonymous review panel whose deliberations are not made public. >>️
️
Rowan Jacobsen. Inside the risky bat-virus engineering that links America to Wuhan. China emulated US techniques to construct novel coronaviruses in unsafe conditions. MIT TechRev. Jun 29, 2021.
Also
<< " ... e Da-Li' si sparse pell' aere un fantasmatico ente supersintetico supercompresso ... >> in: ️2153 - cracker tendenziali (around a matter-sucking maelstrom). Notes. Apr 4, 2008. (quasi-stochastic poetry)
<< in attesa del beffardo tsunami. >> in: 1619 - onda di carambola. Notes. Nov 29, 2004. (quasi-stochastic poetry).
️
keyword 'virus' in Notes (quasi-stochastic poetry)
keyword 'virus' in FonT
keyword 'caos' | 'caotico' in Notes (quasi-stochastic poetry)
FonT
no surprise, no amazement here, I know chickens behaviors.
<< Ricordo che quando si era ragazzi, negli anni sessanta, ... >> in: 2157 - il pino di takata matsubara. Apr 1, 2011. Notes.
giovedì 8 luglio 2021
# gst: apropos of 'disordered interactions', localization and dissociation of bound states and mapping to chaotic billiards concerning two particles on a chain
AA << consider two particles hopping on a chain with a contact interaction between them. At strong interaction, there is a molecular bound state separated by a direct gap from a continuous band of atomic states. Introducing weak disorder in the interaction, the molecular state becomes Anderson localized (exponential localization of all energy eigenstates,). At stronger disorder, part of the molecular band delocalizes and dissociates due to its hybridization to the atomic band. (AA) characterize these different regimes by computing the density of states, the inverse participation ratio, the level-spacing statistics and the survival probability of an initially localized state. >>️
<< The atomic band is best described as that of a rough billiard for a single particle on a square lattice that shows signatures of quantum chaos. In addition to typical ``chaotic states'', (AA) find states that are localized along only one direction. These ``separatrix states'' are more localized than chaotic states, and similar in this respect to scarred states, but their existence is due to the separatrix iso-energy line in the interaction-free dispersion relation, rather than to unstable periodic orbits. >>
Hugo Perrin, Janos K. Asboth, et al. Two particles on a chain with disordered interaction: Localization and dissociation of bound states and mapping to chaotic billiards. arXiv: 2106.09603v1. Jun 17, 2021.
venerdì 2 luglio 2021
# life: Modern Jazz Quartet (MJQ) revisited (precarious attempt to revisit)
Even the impulsive epiphany of Mr. Grillo @beppe_grillo and Mr. Conte @GiuseppeConteIT reminded me of the intriguing story of MJQ ...
2124 - attrattore cooperativo bipolare (nell' elastici spigoli). Mar 05, 2007. (quasi-stochastic poetry)
The point is that MJQ were talented professionals in (conversational, cooperative, hacking-craking) chaotic phrasing ...
instead this just feels like unstructured chaos
Jason Horowitz. How Giuseppe Conte of Italy Went From Irrelevant to Irreplaceable. NYT. Aug. 29, 2019.
Conte-Grillo, what are the points of conflict that split the M5S. June 27, 2021.
PostNote
Apropos of the "ulteriore elemento di impredicibilità" (further element of unpredictability) https://inkpi.blogspot.com/2007/03/2124-attrattore-cooperativo-bipolare.html the inkling about the image of an acyclic bipolar avatar generated and controlled by an artificial intelligence - characterized by sufficient degrees of freedom and self-maintenance - could, hypothetically, create and modulate (unexpected) novelties, not necessarily at least in a first approximation, with harmful-self-damaging outcomes.
mercoledì 30 giugno 2021
# gst: weird Nature; randomly arranged nanowire networks seem to behave, at the edge of chaos, like cortical neuronal cultures
<< an artificial network of nanowires can be tuned to respond in a brain-like way when electrically stimulated. >>️
<< If the signal stimulating the network was too low, then the pathways were too predictable and orderly and did not produce complex enough outputs to be useful. If the electrical signal overwhelmed the network, the output was completely chaotic and useless for problem solving. The optimal signal for producing a useful output was at the edge of this chaotic state. >>️
<< Some theories in neuroscience suggest the human mind could operate at this edge of chaos, or what is called the critical state, (..) Some neuroscientists think it is in this state where we achieve maximal brain performance. (..) What's so exciting about this result is that it suggests that these types of nanowire networks can be tuned into regimes with diverse, brain-like collective dynamics, which can be leveraged to optimize information processing. >> Zdenka Kuncic.️
<< In the nanowire network the junctions between the wires allow the system to incorporate memory and operations into a single system. This is unlike standard computers, which separate memory (RAM) and operations (CPUs). >>
<< These junctions act like computer transistors but with the additional property of remembering that signals have traveled that pathway before. As such, they are called 'memristors', >> Joel Hochstetter.
️
'Edge of chaos' opens pathway to artificial intelligence discoveries. University of Sydney. Jun 29, 2021.
Joel Hochstetter, Ruomin Zhu, et al. Avalanches and edge-of-chaos learning in neuromorphic nanowire networks. Nat Commun 12, 4008. doi: 10.1038/ s41467-021-24260-z. Jun 29, 2021.
mercoledì 19 maggio 2021
# gst: a scenario in which System Theory meets Poetry, bird's-eye vistas into a primitive chaos
<< The notion of primitive chaos was proposed [J. Phys. Soc. Jpn. 79, 15002 (2010)] as a notion closely related to the fundamental problems of physics itself such as determinism, causality, free will, predictability, and irreversibility. In this letter, (AA) introduce the notion of bird's-eye view into the primitive chaos, and (they) find a new hierarchic structure of the primitive chaos. This means that if we find a chaos in a real phenomenon or a computer simulation, behind it, we can clearly realize the possibility of tremendous varieties of chaos in the hierarchic structure unless we can see them visually. >>
<< This fact provides a totally new method of viewing our world. >>️️
Yoshihito Ogasawara. Bird's-Eye View of Primitive Chaos. arXiv:2105.04796v2 [nlin.CD]. May 17, 2021.
Also
Ludwig von Bertalanffy (gst)
keyword 'caos' | 'caotico' in Notes (quasi-stochastic poetry)
venerdì 9 aprile 2021
# gst: this arrangement may not be completely random; you might observe ordered structures (also) into amorphous (metallic glasses) solids
<< Glass, rubber and plastics all belong to a class of matter called amorphous solids. And in spite of how common they are in our everyday lives, amorphous solids have long posed a challenge to scientists. >>
A study << reports on the first-ever determination of the 3D atomic structure of an amorphous solid—in this case, a material called metallic glass. >>️
️
<< Because amorphous solids have been so difficult to characterize, the researchers expected the atoms to be arranged chaotically. And although about 85% of the atoms were in a disordered arrangement, the researchers were able to identify pockets where a fraction of atoms coalesced into ordered superclusters. The finding demonstrated that even within an amorphous solid, the arrangement of atoms is not completely random. >>️
Wayne Lewis. Century-old problem solved with first-ever 3D atomic imaging of an amorphous solid. University of California, Los Angeles. Mar 31, 2021.
Yang Y., Zhou J., et al. Determining the three-dimensional atomic structure of an amorphous solid. Nature 592, 60–64. doi: 10.1038/ s41586-021-03354-0. Mar 31, 2021.
mercoledì 3 marzo 2021
# gst: labyrinth chaos: revisiting the elegant, chaotic and hyperchaotic walks
<< Labyrinth chaos was discovered by Otto Rossler and Rene' Thomas in their endeavour to identify the necessary mathematical conditions for the appearance of chaotic and hyperchaotic motion in continuous flows. Here, (AA) celebrate their discovery by considering a single labyrinth walks system and an array of coupled labyrinth chaos systems that exhibit complex, chaotic behaviour, reminiscent of chimera-like states, a peculiar synchronisation phenomenon. >>
<< As all Rossler’s pioneering contributions, labyrinth chaos still holds promise for very interesting further developments. Its simplicity and elegance, both in terms of symmetries, topology and feedback-circuit structure, makes it a good candidate to compare it with other nonlinear, cyclically coupled systems, such as the Arabesques, the Lotka-Voltera system and its variants, and the Arnold-Beltrami-Childress model. >>
Vasileios Basios, Chris G. Antonopoulos, Anouchah Latifi. Labyrinth chaos: Revisiting the elegant, chaotic and hyperchaotic walks. arXiv: 2011.11009v1. Nov 22, 2020.
martedì 23 febbraio 2021
# gst: a slow motion can triggers strong, fast-slip (many miles away)
<< At a glacier near the South Pole, earth scientists have found evidence of a quiet, slow-motion fault slip that triggers strong, fast-slip earthquakes many miles away, >>
<< During an earthquake, a fast slip happens when energy builds up underground and is released quickly along a fault. Blocks of earth rapidly slide against one another. However, at an Antarctic glacier called Whillans Ice Plain, (they) show that "slow slips" precede dozens of large magnitude 7 earthquakes. >>
<< We found that there is almost always a precursory 'slow slip' before an earthquake, >> Grace Barcheck.
<< these slow-slip precursors- occurring as far as 20 miles away from the epicenter- are directly involved in starting the earthquake. >>
<< These slow slips are remarkably common, (..) and they migrate toward where the fast earthquake slip starts. >>
<< Within a period of two months in 2014, the group captured 75 earthquakes at the bottom of the Antarctic glacier. Data from GPS stations indicated that 73- or 96% - of the 75 earthquakes showed a period of precursory slow motion. >>
Blaine Friedlander. Slow motion precursors give earthquakes the fast slip. Cornell University. Feb 16, 2021.
️
G. Barcheck, E. Brodsky, et al. Migratory earthquake precursors are dominant on an ice stream fault. Science Advances. Vol. 7, no. 6, eabd0105. doi: 10.1126/ sciadv.abd0105. Feb 5, 2021.
martedì 22 settembre 2020
# gst: near a critical point, switching between exploitation and exploration, to approach life with Lévy's (chaotic) walk
<< Lévy walks are common biological movements. However, the functional advantages of Lévy walks emerging near a critical point are poorly understood. >>
AA << showed that there could be functional advantages associated with Lévy walks emerging near a critical point, including a large dynamic range to stimuli and highly flexible switching between exploitation and exploration. >>
Masato S. Abe. Functional advantages of Lévy walks emerging near a critical point. PNAS. doi: 10.1073/ pnas.2001548117. Sep 14, 2020.
Chaotic 'Lévy walks' are a good strategy for animals. Riken. Sep 17, 2020.
Also
Lévy flight hypothesis, not only for predation ... Nov 22, 2015.
keyword 'Lévy' in FonT
sabato 28 dicembre 2019
# gst: scrambling does not necessitate chaos.
<< Focusing on semiclassical systems, (AA) show that the parametrically long exponential growth of out-of-time order correlators (OTOCs), also known as scrambling, does not necessitate chaos. Indeed, scrambling can simply result from the presence of unstable fixed points in phase space, even in an integrable model. >>
Tianrui Xu, Thomas Scaffidi, Xiangyu Cao. Does scrambling equal chaos? arXiv:1912.11063v1 [cond-mat.stat-mech] Dec 23, 2019.
https://arxiv.org/abs/1912.11063
lunedì 14 ottobre 2019
# gst: chaotic dynamics modulate complex systems, even in the presence of extrinsic and intrinsic noise
AA << find that chaotic dynamics modulates gene expression and up-regulates certain families of low-affinity genes, even in the presence of extrinsic and intrinsic noise. Furthermore, this leads to an increase in the production of protein complexes and the efficiency of their assembly. Finally, (AA) show how chaotic dynamics creates a heterogeneous population of cell states, and describe how this can be beneficial in multi-toxic environments. >>
Mathias L. Heltberg, Sandeep Krishna, Mogens H. Jensen. On chaotic dynamics in transcription factors and the associated effects in differential gene regulation. Nature Comm. volume 10, Article number: 71 Jan 8, 2019. https://www.nature.com/articles/s41467-018-07932-1
<< Chaos in bodily regulation can optimize our immune system according to a recent discovery made by researchers at the University of Copenhagen's Niels Bohr Institute. The discovery may prove to be of great significance for avoiding serious diseases such as cancer and diabetes. >>
Chaos in the body tunes up your immune system. Niels Bohr Institute.
Jan 16, 2019. https://m.medicalxpress.com/news/2019-01-chaos-body-tunes-immune.html
Also
'l'immaginifico "tracciante ... che svagola nella macina ...' in: 2149 - onda di predazione (to knock seals off the ice). Notes. Dec 17, 2007. https://inkpi.blogspot.com/2007/12/2149-onda-di-predazione-to-knock-seals.html
Also
never boring with chaos and tit-for-tat theories. F.on.T. Jun 12, 2016. https://flashontrack.blogspot.com/2016/06/s-gst-never-boring-with-chaos-and-tit.html
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