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A Pulse-Gated, Predictive Neural Circuit [article]

Yuxiu Shao, Andrew T. Sornborger, Louis Tao
<span title="2017-03-15">2017</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Recent evidence suggests that neural information is encoded in packets and may be flexibly routed from region to region. We have hypothesized that neural circuits are split into sub-circuits where one sub-circuit controls information propagation via pulse gating and a second sub-circuit processes graded information under the control of the first sub-circuit. Using an explicit pulse-gating mechanism, we have been able to show how information may be processed by such pulse-controlled circuits and
more &raquo; ... also how, by allowing the information processing circuit to interact with the gating circuit, decisions can be made. Here, we demonstrate how Hebbian plasticity may be used to supplement our pulse-gated information processing framework by implementing a machine learning algorithm. The resulting neural circuit has a number of structures that are similar to biological neural systems, including a layered structure and information propagation driven by oscillatory gating with a complex frequency spectrum.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1703.05406v1">arXiv:1703.05406v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/mv5i6l22kfgt5azzigar65cvuq">fatcat:mv5i6l22kfgt5azzigar65cvuq</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200830235932/https://arxiv.org/pdf/1703.05406v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/21/6c/216c1f8b78fa643978010a033579c95ec2285772.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1703.05406v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

A Mechanism for Synaptic Copy between Neural Circuits [article]

Yuxiu Shao, Binxu Wang, Andrew Sornborger, Louis Tao
<span title="2018-06-20">2018</span> <i title="Cold Spring Harbor Laboratory"> bioRxiv </i> &nbsp; <span class="release-stage" >pre-print</span>
The brain has a central, short-term learning module, the hippocampus, which transfers what it has learned to long-term memory in cortex during non-REM sleep. The putative mechanism responsible for this type of memory consolidation invokes hierarchically nested hippocampal ripples (100-250 Hz), thalamo-cortical spindles (7-15 Hz), and cortical slow oscillations (< 1 Hz) to enable transfer. Suppression of, for instance, thalamic spindles has been shown to impair hippocampus-dependent memory
more &raquo; ... idation. Cortical oscillations are central to information transfer in neural systems. Significant evidence supports the idea that coincident spike input can allow the neural threshold to be overcome, and spikes to be propagated downstream in a circuit. Thus, an observation of oscillations in neural circuits would be an indication that repeated synchronous spiking is enabling information transfer. However, formemorytransfer, in whichsynaptic weightsmust be being transferred from one neural circuit (region) to another, what is the mechanism? Here, we present a synaptic transfer mechanism whose structure provides some understanding of the phenomena that have been implicated in memory transfer, including the nested oscillations at various frequencies. The circuit is based on the principle of pulse-gated, graded information transfer between neural populations.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1101/351114">doi:10.1101/351114</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/m3j6f74irbfifj4fvahsgfukoi">fatcat:m3j6f74irbfifj4fvahsgfukoi</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20190502143435/https://www.biorxiv.org/content/biorxiv/early/2018/07/27/351114.full.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/4c/0d/4c0dd97972c609959451bed4223dcfdba2e7a313.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1101/351114"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> biorxiv.org </button> </a>

Exact, Dynamically Routable Current Propagation in Pulse-Gated Synfire Chains [article]

Andrew T. Sornborger, Louis Tao
<span title="2014-10-05">2014</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Neural oscillations can enhance feature recognition, modulate interactions between neurons, and improve learning and memory. Simulational studies have shown that coherent oscillations give rise to windows in time during which information transfer can be enhanced in neuronal networks. Unanswered questions are: 1) What is the transfer mechanism? And 2) how well can a transfer be executed? Here, we present a pulse-based mechanism by which graded current amplitudes may be exactly propagated from
more &raquo; ... neuronal population to another. The mechanism relies on the downstream gating of mean synaptic current amplitude from one population of neurons to another via a pulse. Because transfer is pulse-based, information may be dynamically routed through a neural circuit. We demonstrate the amplitude transfer mechanism in a realistic network of spiking neurons and show that it is robust to noise in the form of pulse timing inaccuracies, random synaptic strengths and finite size effects. In finding an exact, analytical solution to a fundamental problem of information coding in the brain, graded information transfer, we have isolated a basic mechanism that may be used as a building block for fast, complex information processing in neural circuits.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1410.1115v1">arXiv:1410.1115v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/5u5t2v2lo5ecxkqvq2g5bfgcfy">fatcat:5u5t2v2lo5ecxkqvq2g5bfgcfy</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200920105057/https://arxiv.org/pdf/1410.1115v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/ed/99/ed990b4bf48c6fd8ef3b86b1c2b7667aeb498c2c.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1410.1115v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

A Unified Framework for Information Coding: Oscillations, Memory, and Zombie Modes [article]

Andrew T. Sornborger, Louis Tao
<span title="2014-10-05">2014</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Synchronous neural activity can improve neural processing and is believed to mediate neuronal interaction by providing temporal windows during which information is more easily transferred. We demonstrate a pulse gating mechanism in a feedforward network that can exactly propagate graded information through a multilayer circuit. Based on this mechanism, we present a unified framework wherein neural information coding and processing can be considered as a product of linear maps under the active
more &raquo; ... ntrol of a pulse generator. Distinct control and processing components combine to form the basis for the binding, propagation, and processing of dynamically routed information within neural pathways. Using our framework, we construct example neural circuits to 1) maintain a short-term memory, 2) compute time-windowed Fourier transforms, and 3) perform spatial rotations. We postulate that such circuits, with stereotyped control and processing of information, are the neural correlates of Crick and Koch's zombie modes.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1410.1116v1">arXiv:1410.1116v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/wndtgwykbvfmfhtnnfn5q47ncq">fatcat:wndtgwykbvfmfhtnnfn5q47ncq</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200906185537/https://arxiv.org/pdf/1410.1116v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/50/91/5091d00bce6ca86829fddfe354788afa66cfc93a.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1410.1116v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Editorial for Special Issue: "Remotely Sensed Albedo"

Jean-Louis Roujean, Shunlin Liang, Tao He
<span title="2019-08-20">2019</span> <i title="MDPI AG"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/kay2tsbijbawliu45dnhvyvgsq" style="color: black;">Remote Sensing</a> </i> &nbsp;
Land surface (bare soil, vegetation, and snow) albedo is an essential climate variable that affects the Earth's radiation budget, and therefore, is of vital interest for a broad number of applications: Thematic (urban, cryosphere, land cover, and bare soil), climate (Long Term Data Record), processing technics (gap filling, data merging), and products validation (cal/val) [...]
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.3390/rs11161941">doi:10.3390/rs11161941</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/6j4shs3robd6xdtvyaoxlbuh6i">fatcat:6j4shs3robd6xdtvyaoxlbuh6i</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20210429033726/https://hal.archives-ouvertes.fr/hal-02354398/file/remotesensing-11-01941.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/06/47/0647ba568a4cbc2db3d09179e76674e58437163c.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.3390/rs11161941"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="unlock alternate icon" style="background-color: #fb971f;"></i> mdpi.com </button> </a>

Mutual Information and Information Gating in Synfire Chains

Zhuocheng Xiao, Binxu Wang, Andrew Sornborger, Louis Tao
<span title="2018-02-01">2018</span> <i title="MDPI AG"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/4d3elkqvznfzho6ki7a35bt47u" style="color: black;">Entropy</a> </i> &nbsp;
Coherent neuronal activity is believed to underlie the transfer and processing of information in the brain. Coherent activity in the form of synchronous firing and oscillations has been measured in many brain regions and has been correlated with enhanced feature processing and other sensory and cognitive functions. In the theoretical context, synfire chains and the transfer of transient activity packets in feedforward networks have been appealed to in order to describe coherent spiking and
more &raquo; ... mation transfer. Recently, it has been demonstrated that the classical synfire chain architecture, with the addition of suitably timed gating currents, can support the graded transfer of mean firing rates in feedforward networks (called synfire-gated synfire chains-SGSCs). Here we study information propagation in SGSCs by examining mutual information as a function of layer number in a feedforward network. We explore the effects of gating and noise on information transfer in synfire chains and demonstrate that asymptotically, two main regions exist in parameter space where information may be propagated and its propagation is controlled by pulse-gating: a large region where binary codes may be propagated, and a smaller region near a cusp in parameter space that supports graded propagation across many layers.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.3390/e20020102">doi:10.3390/e20020102</a> <a target="_blank" rel="external noopener" href="https://www.ncbi.nlm.nih.gov/pubmed/33265193">pmid:33265193</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/wpp6pjshynckne2u6a4a32tkfy">fatcat:wpp6pjshynckne2u6a4a32tkfy</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20180727145733/https://res.mdpi.com/def502008e7c1b975a3faacf4a5c96c166a3b3354d27483f694b5e5f6d07fdb4849ed86fca3e8977b64cdb060a24bfad31da7a8dc3600785e56beeaea232020309e9771669fa43c62232fda5423819f15b0958bbcae07b599f495486fe221894ee6d02d21b5fa1fa8c025b9806af097783eda1c933bbd04477287c829c05176f7630928ae577393ec3c2c790acb506a0?filename=&amp;attachment=1" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/94/64/94647709f35bb98bef2a6f830839ddc1d27b21e5.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.3390/e20020102"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="unlock alternate icon" style="background-color: #fb971f;"></i> mdpi.com </button> </a>

Lacunarity of random fractals

Francisco J Solis, Louis Tao
<span title="">1997</span> <i title="Elsevier BV"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/j5vumr4o65agbmeqovmzt67pqe" style="color: black;">Physics Letters A</a> </i> &nbsp;
We discuss properties of random fractals by means of a set of numbers that characterize their universal properties. This set is the generalized singularity specturm that consists of the usual spectrum of mulitfractal dimensions and the associated complex analogs. Furthermore, non-universal properties are recovered from the study of a series of functions which are generalizations of the so-called energy intergral.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1016/s0375-9601(97)00150-3">doi:10.1016/s0375-9601(97)00150-3</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/6nyaolcssre3jdz7fk6dom3gsm">fatcat:6nyaolcssre3jdz7fk6dom3gsm</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20171008113134/https://core.ac.uk/download/pdf/2404084.pdf" title="fulltext PDF download [not primary version]" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <span style="color: #f43e3e;">&#10033;</span> <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/a0/5e/a05ee5b42d1792cd6677fcc0b392d6cdc4f62647.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1016/s0375-9601(97)00150-3"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> elsevier.com </button> </a>

Dimensional Reduction of Emergent Spatiotemporal Cortical Dynamics via a Maximum Entropy Moment Closure [article]

Yuxiu Shao, Jiwei Zhang, Louis Tao
<span title="2019-07-15">2019</span> <i title="Cold Spring Harbor Laboratory"> bioRxiv </i> &nbsp; <span class="release-stage" >pre-print</span>
AbstractModern electrophysiological recordings and optical imaging techniques have revealed a diverse spectrum of spatiotemporal neural activities underlying fundamental cognitive processing. Oscillations, traveling waves and other complex population dynamical patterns are often concomitant with sensory processing, information transfer, decision making and memory consolidation. While neural population models such as neural mass, population density and kinetic theoretical models have been used
more &raquo; ... capture a wide range of the experimentally observed dynamics, a full account of how the multi-scale dynamics emerges from the detailed biophysical properties of individual neurons and the network architecture remains elusive. Here we apply a recently developed coarse-graining framework for reduced-dimensional descriptions of neuronal networks to model visual cortical dynamics. We show that, without introducing any new parameters, how a sequence of models culminating in an augmented system of spatially-coupled ODEs can effectively model a wide range of the observed cortical dynamics, ranging from visual stimulus orientation dynamics to traveling waves induced by visual illusory stimuli. In addition to an efficient simulation method, this framework also offers an analytic approach to studying large-scale network dynamics. As such, the dimensional reduction naturally leads to mesoscopic variables that capture the interplay between neuronal population stochasticity and network architecture that we believe to underlie many emergent cortical phenomena.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1101/703207">doi:10.1101/703207</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/i2jwt3x4frf4rli6ggczkxlv6i">fatcat:i2jwt3x4frf4rli6ggczkxlv6i</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200325045118/https://www.biorxiv.org/content/biorxiv/early/2019/07/15/703207.full.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/48/a9/48a95f4e48ef0b58e4351280bc6a3f311500e02a.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1101/703207"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> biorxiv.org </button> </a>

On the co-degree threshold for the Fano plane [article]

Louis DeBiasio, Tao Jiang
<span title="2013-06-23">2013</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Given a 3-graph H, let _2(n, H) denote the maximum value of the minimum codegree of a 3-graph on n vertices which does not contain a copy of H. Let F denote the Fano plane, which is the 3-graph {axx',ayy',azz',xyz',xy'z,x'yz,x'y'z'}. Mubayi proved that _2(n,F)=(1/2+o(1))n and conjectured that _2(n, F)=n/2 for sufficiently large n. Using a very sophisticated quasi-randomness argument, Keevash proved Mubayi's conjecture. Here we give a simple proof of Mubayi's conjecture by using a class of
more &raquo; ... hs that we call rings. We also determine the Turán density of the family of rings.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1204.1927v2">arXiv:1204.1927v2</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/ssgjj57uszd5jdh5qfkodwvslu">fatcat:ssgjj57uszd5jdh5qfkodwvslu</a> </span>
<a target="_blank" rel="noopener" href="https://archive.org/download/arxiv-1204.1927/1204.1927.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> File Archive [PDF] </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1204.1927v2" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Spin-Excitations Anisotropy in the Bilayer Iron-Based Superconductor CaKFe_4As_4 [article]

Tao Xie, Chang Liu, Frederic Bourdarot, Louis-Pierre Regnault, Shiliang Li, Huiqian Luo
<span title="2020-04-03">2020</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
We use polarized inelastic neutron scattering to study the spin-excitations anisotropy in the bilayer iron-based superconductor CaKFe_4As_4 (T_c = 35 K). In the superconducting state, both odd and even L-modulations of spin resonance have been observed in our previous unpolarized neutron scattering experiments (T. Xie et al. Phys. Rev. Lett. 120, 267003 (2018)). Here we find that the high-energy even mode (∼ 18 meV) is isotropic in spin space, but the low-energy odd modes consist of a c-axis
more &raquo; ... arized mode around 9 meV along with another partially overlapped in-plane mode around 12 meV. We argue that such spin anisotropy is induced by the spin-orbit coupling in the spin-vortex-type fluctuations of this unique compound. The spin anisotropy is strongly affected by the superconductivity, where it is weak below 6 meV in the normal state and then transferred to higher energy and further enhanced in the odd mode of spin resonance below T_c.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2004.01405v1">arXiv:2004.01405v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/th65dzkpsnh4tky6hqvlnt5asi">fatcat:th65dzkpsnh4tky6hqvlnt5asi</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200407013059/https://arxiv.org/pdf/2004.01405v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2004.01405v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Optimal sine and sawtooth inequalities [article]

Louis Esser, Terence Tao, Burt Totaro, Chengxi Wang
<span title="2021-09-29">2021</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
We determine the optimal inequality of the form ∑_k=1^m a_ksin kx≤ 1, in the sense that ∑_k=1^m a_k is maximal. We also solve exactly the analogous problem for the sawtooth (or signed fractional part) function. Equivalently, we solve exactly an optimization problem about equidistribution on the unit circle.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2107.11058v2">arXiv:2107.11058v2</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/doyp2z4kjvhkxa2inujpxmipyu">fatcat:doyp2z4kjvhkxa2inujpxmipyu</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20211002071223/https://arxiv.org/pdf/2107.11058v2.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/4f/1d/4f1d6f2e3681369039082aae8cecd1c82c7afb89.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2107.11058v2" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Photofluid instabilities of hot stellar envelopes

Edward A Spiegel, Louis Tao
<span title="">1999</span> <i title="Elsevier BV"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/jpqyz5yp6vdibnpfaxmvgvtise" style="color: black;">Physics reports</a> </i> &nbsp;
Beginning from a relatively simple set of dynamical equations for a fluid permeated by a radiative field strong enough to produce significant forces, we find the structure of plane-parallel equilibria and study their stability to small acoustic disturbances. In doing this, we neglect viscous effects and complications of nongreyness. We find that acoutic instabilities occur over a wide range of conditions below the Eddington limit. This result is in line with findings reported twenty years ago
more &raquo; ... t it contradicts some more recent reports of the absence of instabilities. We briefly attempt to identify the causes of the discrepancies and then close with a discussion of the possible astrophysical interest of such instabilities.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1016/s0370-1573(98)00097-0">doi:10.1016/s0370-1573(98)00097-0</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/wqp6km3zyvgplkazguzumvpag4">fatcat:wqp6km3zyvgplkazguzumvpag4</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20180724192424/http://cds.cern.ch/record/368150/files/9810225.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/d9/39/d9399ef292e256183db353c8191d0da0594e222a.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1016/s0370-1573(98)00097-0"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> elsevier.com </button> </a>

Kinetic theory for neuronal network dynamics

David Cai, David W. McLaughlin, Aaditya V. Rangan, Louis Tao
<span title="">2006</span> <i title="International Press of Boston"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/daz3uyackncjrc6w57f6bd2b5a" style="color: black;">Communications in Mathematical Sciences</a> </i> &nbsp;
We present a detailed theoretical framework for statistical descriptions of neuronal networks and derive (1 + 1)-dimensional kinetic equations, without introducing any new parameters, directly from conductance-based integrate-and-fire neuronal networks. We describe the details of derivation of our kinetic equation, proceeding from the simplest case of one excitatory neuron, to coupled networks of purely excitatory neurons, to coupled networks consisting of both excitatory and inhibitory
more &raquo; ... The dimension reduction in our theory is achieved via novel moment closures. We also describe the limiting forms of our kinetic theory in various limits, such as the limit of mean-driven dynamics and the limit of infinitely fast conductances. We establish accuracy of our kinetic theory by comparing its prediction with the full simulations of the original point-neuron networks. We emphasize that our kinetic theory is dynamically accurate, i.e., it captures very well the instantaneous statistical properties of neuronal networks under time-inhomogeneous inputs.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.4310/cms.2006.v4.n1.a4">doi:10.4310/cms.2006.v4.n1.a4</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/2gve5bx2a5hhxmjxaor2woa4q4">fatcat:2gve5bx2a5hhxmjxaor2woa4q4</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20060913114328/http://www.math.nyu.edu/~rangan/RANGAN_KTderive.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/56/67/5667bc6680b3f0bd13d3fc3dffc8393bbe92fb0b.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.4310/cms.2006.v4.n1.a4"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="unlock alternate icon" style="background-color: #fb971f;"></i> Publisher / doi.org </button> </a>

China's Pattern of Growth: Moving to Sustainability and Reducing Inequality

Louis Kuijs, Tao Wang
<span title="">2006</span> <i title="Wiley"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/bh63qzcbmjfd7fmv43t2znqqpm" style="color: black;">China &amp; World Economy</a> </i> &nbsp;
This paper studies the sources and pattern of China's impressive economic growth over the last 25 years, and shows that key issues currently of concern to policymakers-widening inequality, rural poverty, and resource intensity-are to a large extent rooted in China's growth strategy, and resolving them requires a rebalancing of policies. Using both macro level and sectoral data and analyses, the paper extends the growth accounting framework to decompose the sources of labor productivity growth.
more &raquo; ... e find that growth of industrial production, led by a massive investment effort that boosted the capital/labor ratio, has been the single most important factor driving GDP and overall labor productivity growth since the early 1990s. The shift of labor from lowproductivity agriculture has been limited, and, hence, contributed only marginally to overall labor productivity growth. The productivity gap between agriculture and the rest of the economy has continued to widen, leading to increased rural-urban income inequality. Looking ahead, we calibrate two alternative scenarios. We show that continuing with the current growth pattern would further increase already high investment and saving needs to unsustainable levels, lower urban employment growth ,and widen the rural-urban income gap. On the other hand, reducing subsidies to industry and investment, encouraging the development of the services industry, and reducing barriers to labor mobility would result in a more balanced growth with an investment-to-GDP ratio that is consistent with the medium-term saving trend, faster growth in urban employment, and a substantial reduction in the income gap between rural and urban residents.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1111/j.1749-124x.2006.00003.x">doi:10.1111/j.1749-124x.2006.00003.x</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/nziov7ouv5dh3enirazwmfghcu">fatcat:nziov7ouv5dh3enirazwmfghcu</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20170818063620/http://documents.worldbank.org/curated/en/472491468025188416/pdf/418540CHA0Patt1rch1Oct200501PUBLIC1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/ef/2c/ef2c4c2f03c392c80a73c3b1ecc0f926c0d28cb8.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1111/j.1749-124x.2006.00003.x"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> Publisher / doi.org </button> </a>

Temperature dependence of basalt weathering

Gaojun Li, Jens Hartmann, Louis A. Derry, A. Joshua West, Chen-Feng You, Xiaoyong Long, Tao Zhan, Laifeng Li, Gen Li, Wenhong Qiu, Tao Li, Lianwen Liu (+4 others)
<span title="">2016</span> <i title="Elsevier BV"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/bj6vv5z6dnanjat7ndtocsdp7i" style="color: black;">Earth and Planetary Science Letters</a> </i> &nbsp;
The homeostatic balance of Earth's long-term carbon cycle and the equable state of Earth's climate are maintained by negative feedbacks between the levels of atmospheric CO 2 and the chemical weathering rate of silicate rocks. Though clearly demonstrated by well-controlled laboratory dissolution experiments, the temperature dependence of silicate weathering rates, hypothesized to play a central role in these weathering feedbacks, has been difficult to quantify clearly in natural settings at
more &raquo; ... scape scale. By compiling data from basaltic catchments worldwide and considering only inactive volcanic fields (IVFs), here we show that the rate of CO 2 consumption associated with the weathering of basaltic rocks is strongly correlated with mean annual temperature (MAT) as predicted by chemical kinetics. Relations between temperature and CO 2 consumption rate for active volcanic fields (AVFs) are complicated by other factors such as eruption age, hydrothermal activity, and hydrological complexities. On the basis of this updated data compilation we are not able to distinguish whether or not there is a significant runoff control on basalt weathering rates. Nonetheless, the simple temperature control as observed in this global dataset implies that basalt weathering could be an effective mechanism for Earth to modulate long-term carbon cycle perturbations.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1016/j.epsl.2016.03.015">doi:10.1016/j.epsl.2016.03.015</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/shvx7z4myfcahmtoenimj3duny">fatcat:shvx7z4myfcahmtoenimj3duny</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20171003011916/http://publisher-connector.core.ac.uk/resourcesync/data/elsevier/pdf/c19/aHR0cDovL2FwaS5lbHNldmllci5jb20vY29udGVudC9hcnRpY2xlL3BpaS9zMDAxMjgyMXgxNjMwMTAyOQ%3D%3D.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/af/6d/af6d0d13e8efa7a8a1090c25a63e7017a159e2db.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1016/j.epsl.2016.03.015"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="unlock alternate icon" style="background-color: #fb971f;"></i> elsevier.com </button> </a>
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