Questions tagged [network]

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Struggling with question about non-increasing energy function in a symmetric weight neural network

I'm trying to work out problem 1.1 on page 13 in Statistical Mechanics of Learning where the authors ask you to prove the following claim. Consider a neural network model with neurons whose ...
thobanster's user avatar
1 vote
0 answers
35 views

Density functional matrix for network analysis

I am an archeologist just beginning to venture into the study of crystalline materials, specifically ceramics, to understand how their spatial distribution and formation process can be studied using ...
Jayeeta Ghosh's user avatar
5 votes
1 answer
356 views

From Feynman diagram to electrical circuit in arXiv:hep-th/0308184 by Rajesh Gopakumar

I am asking this question on behalf of user furious.neutrino. I asked this question at Electrical Engineering Stack Exchange, but it has not received a reply, so I am duplicating it here. I think the ...
Math Keeps Me Busy's user avatar
1 vote
1 answer
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In an $RLC$ circuit, where there are multiple components instead of a single resistor/inductor/capacitor how does impedance $Z$ is calculated?

If there is an $RLC$ circuit where some components are in series with one another and some components are in parallel with one another, how does the total impedance of the circuit is calculated? I ...
Raymonk Surya's user avatar
1 vote
1 answer
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A square lattice in a homogeneous magnetic field B: How would it be the direction of the magnetic potential $A$ in the given picture?

I have an infinite square lattice that is placed in a homogenous magnetic field $B$ with vector potential $A$. My Question Can someone please explain/illustrate how it would be the direction and ...
sara96's user avatar
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-1 votes
1 answer
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Static equilibrium of a small spring network [closed]

Three springs $AB$, $OB$ and $CB$ with equal spring constants are fixed at the nodes $A$, $O$ and $C$ respectively and attached to a common node $B$, as shown below. The springs are at rest in this ...
Olumide's user avatar
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$N$-Port Network connectivity matrix versus reflection coefficient

For a $N$-port network, if there are $x$ number of internal ports and $y$ number of external ports, we define a connectivity matrix which relates all internal ports to each other. The symbol usually ...
JOHN's user avatar
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1 answer
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Two Port Network

So I'm studying $S$ parameters for two port networks. I've seen some special cases like what happens if port 2 is short circuited or if port 2 is matched with port 1. I was wondering what happens if ...
JOHN's user avatar
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270 views

Loops in Loop Quantum Gravity

Am I correct in understanding that in Loop Quantum Gravity, loops are somehow interconnected with each other or interact, or is there some form of quantum entanglement between them? And if so, can we ...
Арман Гаспарян's user avatar
1 vote
1 answer
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Differences between the complex networks and social networks

How could I state in simple terms the differences between the literature of Complex Networks (after Albert-barabasi and Watts-Strogatz - Physics Literature) and the literature of Social Networks (...
DanielTheRocketMan's user avatar
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How do you explain the unit of this formula?

I have trouble trying to interpret the following formula: $$G_{SCI} = \mu N^{span} G^3 \mathrm{arcsinh}\,(\rho \Delta f^2)$$ $$G_{SCI} = \frac{P_{SCI}}{B},$$ where $P_{SCI}$ is the self-channel ...
Nguyen Quang Anh's user avatar
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Is there a minimum principle which governs neuronal activity in brain function? [closed]

Reinforcement learning is a well established field which attempts to explain the behavior and decision-making of toddlers, among other agents. The core principle of this theory is based on dynamic ...
kbakshi314's user avatar
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Pipe network analysis but without knowing about loops?

Pipe network analysis methods like the Hardy-Cross method require two conditions to be met. 1) The inflow to a node must equal the outflow from that node. 2) The pressure change along a complete loop ...
Adam Marciniak's user avatar
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1 answer
126 views

What is the advantage of neutral atom quantum network advantage?

I'm interested in quantum network system using neutral atom for my interest of atomic physics. But I'm curious about what the advantage of the neutral-atom-based quantum network instead of other ...
William's user avatar
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Could a scientist use the internet to detect gravitational waves?

According to my understanding (I'm not a physicist just a fan), LIGO measures the changes in two path's lengths to detect gravitational waves by sending a particle down each path at the constant speed ...
mikeLundquist's user avatar
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Is it possible to implement the Invaded Cluster Algorithm on a network of Ising spins rather than a lattice?

My main concern is how to know if a cluster has percolated the network. For a periodic square lattice it is easy to determine if the cluster percolates by looking at the size of the cluster (as given ...
Pratyush Kollepara's user avatar
1 vote
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427 views

Calculate the scattering matrix of a 3-port lumped element network [closed]

I can get S11 and S12 by terminating port 2 and 3 with Z0 and Zr respectively. But when I try to calculate S13 it seems less straight forward. The following is the network, taken from Gao, J. The ...
xi dai's user avatar
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1 answer
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What are exactly "norms" in spin networks? Are there any non-quantum spin networks?

Roger Penrose proposed a series of networks from which, fundamentally, space-time would emerge, called spin networks (https://en.wikipedia.org/wiki/Spin_network) In this article, it is said: Given ...
user avatar
1 vote
1 answer
194 views

Why does S11 seem to be independent of transmission media in this RF transmission experiment?

Hi friends I am starting to characterize a system in which we will plan to measure the response of a sample of liquid to radio waves. In order to do this I am exciting two antennas with the ports of ...
shiva's user avatar
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1 answer
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What influences the variance of signal transmission speed?

I'm currently thinking about the various sources that influence time when it is synchronized with the NTP protocol. One of them is the physical layer (OSI-model). When sending a bit over a cable, ...
Martin Thoma's user avatar
4 votes
2 answers
460 views

How does particle physics use deep neural networks to find particles?

Does anyone use deep learning: RNN, CNN or any other architecture of deep neural networks to asses the standard model or to detect new or unseen particles? What's the status these days in this ...
0x90's user avatar
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2 votes
1 answer
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Entropy of natural networks [duplicate]

How does one define the entropy of a natural network (say for example, a river network, or a morphological skeletal network of a lake in the figure below) ? For example, the following report suggests ...
vbj's user avatar
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2 votes
2 answers
193 views

Percolation theory: What is the critical amplitude for the "backbone" of a 2-D network?

Disclaimer: I am just learning about percolation theory for the first time, so I am not too familiar with some of the terminology. Suppose you have a 2-D square lattice with bonds connecting sites. ...
Darcy's user avatar
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4 votes
1 answer
345 views

How to compute entropy of networks? (Boltzmann microstates and Shannon entropy) [closed]

I also asked in SO here a few days ago, thought it may be also interesting for physics-related answers. I would like to model a network as a system. A particular topology (configuration of edges ...
user305883's user avatar
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1 answer
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How do low voltage differential signals transmit bits

For example: There is Din+ connected to pin a1 and Din- to pin a2. Suppose I am sending "0101". How does it get sent? If there was only Din connected to Pin a1, which has a voltage supply to the bank ...
atnd's user avatar
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1 answer
156 views

What is the physical interpretation of inductors and capacitors equations in Frequency(s) domain?

s-domain modelling of capacitor and inductor equation: V(s)=LsI(s)−Li(0−) I(s)=CsV(s)−Cv(0−)
Shrikant Mahapatra's user avatar
1 vote
1 answer
122 views

Scalar fields of graphs

I am trying to find literature on the propagation of scalar fields over random graphs. Think of a network of ideal resistors (with a given degree distribution), with a voltage source at a random node....
Dionysios Georgiadis's user avatar
3 votes
0 answers
93 views

Geometric frustration in power transmission networks

I read this article concerning the detection of Braess Paradox on power transmission networks: http://phys.org/news/2012-10-power-grid-blackouts-braess-paradox.html Here is a quote from the article: ...
Fabric's user avatar
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1 answer
592 views

Resistance Distance in large electrical networks

I am not tremendously familiar with electrical circuits (I have some memories, but too long ago) and now I have come accross a problem where I need to compute the resistance distance in a graph. So, ...
excalibur1491's user avatar
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What are the first couple terms of the Taylor series for the evolution of this network of capacitors and resistors?

note: This is a computational problem, and I only need approximate accuracy, so the overall goal is, for a given accuracy and $\Delta t$ to compute the state of the system at $t+\Delta t$ to within ...
ZKe's user avatar
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1 vote
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113 views

How can the response at the terminal end of an infinite ladder network be solved?

In a recent post: How can the transfer function of an infinite ladder network be used to solve real world problems? I reference how one can solve the transfer function (impedance) of an infinite ...
docscience's user avatar
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1 vote
1 answer
1k views

How can the transfer function of an infinite ladder network be used to solve real world problems?

In his lectures on Physics, Feynman illustrates a mathematical 'trick' in formulating the impedance of an infinite ladder, LC network. It basically counts on the assumption that adding one more 'rung' ...
docscience's user avatar
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2 votes
0 answers
674 views

How does the spinglass algorithm work when used for community detection in networks?

I am reading the article "Statistical Mechanics of Community Detection" by Jörg Reichardt and Stefarn Bornholdt, which describes how to use the spinglass model from physics to determine communities in ...
Freja's user avatar
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2 votes
1 answer
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Any fractal physical model that generates time series which demonstrate heavy-tailed (non-Gaussian) behavior in some form?

I know that fractal structures have power-laws in various forms "hidden" in them. I am looking for the most simple fractal model that I can find that generates time series with, say, Pareto-...
mt_christo's user avatar
5 votes
1 answer
1k views

Dialing emergency numbers with no network available. How? [closed]

When the network is not available on my phone, it says "emergency calls only". It means that even if I'm in the middle of the desert, with no towers in the vicinity, I can dial the emergency number. ...
arnabanimesh's user avatar
4 votes
0 answers
950 views

Building a Faraday cage for mobile networks that is transparent for optical wavelenghts

A friend of mine is working on an architectonic project, where she designs a Faraday cage type of open space built in parks or other public places. The initial thought is to build it from some sort of ...
Jan Hirschner's user avatar
2 votes
1 answer
112 views

Examples of evolving networks in physics [closed]

I'm a master student working on networks analysis in general. A network is something that has nodes and there are links between the nodes. Nodes and links could have attributes. An evolving network is ...
Jack Twain's user avatar
0 votes
1 answer
4k views

What is the difference between scale-free network and small-world network? [closed]

What is the difference between scale-free network and small-world network? I can't understand from the definitions around the web if they are both the same name for one thing. Do both follow a power-...
linello's user avatar
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6 votes
2 answers
332 views

Why isn't data lost when sent over large distances?

I was thinking about how information is sent, for example through the atmosphere. There are plenty of obstacles, as well diffraction, etc. Still, no information is lost. How is information sent to ...
DarkLightA's user avatar
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2 votes
0 answers
160 views

Book reviewing current state of research on complex networks [closed]

Can anybody recommend a book reviewing the current state of knowledge and active research on complex networks? Not primarily a textbook but a true review of the field - ideally with references to ...
4 votes
0 answers
623 views

Does the spin glass corresponding to a restricted Boltzmann machine have a characteristic timescale?

From what I gather, a Boltzmann machine can be identified with a spin glass. Though I don't know the details yet (and would welcome any references within the last 5 years--not, e.g. MacKay, etc.), I ...
S Huntsman's user avatar
15 votes
2 answers
4k views

Which areas in physics overlap with those of social network theory for the analysis of the graphs?

I am studying social networks in terms of graph theory and linear algebra. I know that physicists have published and worked a lot in this field. This causes me to assume that there are sub-fields in ...
Vass's user avatar
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