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rf.mokslasplius.lt |
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# Physics of Risk blog | ||
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This repository will always contain a single commit with the most recent generated files. For source files (or version history) please refer to our other repositories. |
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<?xml version="1.0" encoding="utf-8"?> | ||
<rss version="2.0"><channel><title>Physics of Risk</title><link>https://rf.mokslasplius.lt/</link><description></description><lastBuildDate>Tue, 19 Dec 2023 08:00:00 +0200</lastBuildDate><item><title>Noise generated by a single charge carrier</title><link>https://rf.mokslasplius.lt/noise-generated-by-single-charge-carrier/</link><description><p><a href="/tag/shot-noise/">Shot noise</a> can be observed in variety of materials, | ||
devices and systems. Let us consider one of the simplest examples from | ||
physics: noise generated by trapping and detrapping of a single charge | ||
carrier.</p> | ||
</description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aleksejus Kononovicius</dc:creator><pubDate>Tue, 19 Dec 2023 08:00:00 +0200</pubDate><guid isPermaLink="false">tag:rf.mokslasplius.lt,2023-12-19:/noise-generated-by-single-charge-carrier/</guid><category>2023</category><category>Interactive models</category><category>statistics</category><category>spectral density</category><category>shot noise</category><category>Lorentzian</category><category>random telegraph noise</category></item><item><title>Shot noise in continuous time</title><link>https://rf.mokslasplius.lt/shot-noise-continuous-time/</link><description><p><a href="https://rf.mokslasplius.lt/shot-noise/">Last time</a> we have moved away from | ||
mathematical abstraction of <a href="/tag/point-process/">point events</a> by | ||
considering pulses of finite duration. Yet the theory we have derived in the | ||
<a href="https://rf.mokslasplius.lt/shot-noise/">earlier post</a> did not fully match | ||
the simulated <a href="/tag/spectral-density/">power spectral density</a>. In this post | ||
we will see that the discrepancy close to the <a href="https://en.wikipedia.org/wiki/Nyquist_frequency">Nyquist | ||
frequency</a> | ||
arises due to the observations being made in discrete time.</p> | ||
</description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aleksejus Kononovicius</dc:creator><pubDate>Tue, 05 Dec 2023 08:00:00 +0200</pubDate><guid isPermaLink="false">tag:rf.mokslasplius.lt,2023-12-05:/shot-noise-continuous-time/</guid><category>2023</category><category>Interactive models</category><category>statistics</category><category>Fourier transform</category><category>spectral density</category><category>shot noise</category></item><item><title>A. Hajimiri: Shot noise and other noises</title><link>https://rf.mokslasplius.lt/a-hajimiri-shot-noise-and-other-noises/</link><description><p>The following video by prof. Ali Hajimiri discusses various types of noises | ||
often seen in physical systems. I have found it and watched it in | ||
preparation to our <a href="https://rf.mokslasplius.lt/shot-noise/">previous post on shot | ||
noise</a>. I believe some of our | ||
readers may find it interesting too.</p> | ||
<div class="embed-responsive embed-responsive-16by9"><iframe class="embed-responsive-item html5-embed html5-embed-youtube" src="https://www.youtube-nocookie.com/embed/Wu4cB9qbrBk" allowfullscreen></iframe></div></description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aleksejus Kononovicius</dc:creator><pubDate>Tue, 28 Nov 2023 08:00:00 +0200</pubDate><guid isPermaLink="false">tag:rf.mokslasplius.lt,2023-11-28:/a-hajimiri-shot-noise-and-other-noises/</guid><category>2023</category><category>video</category><category>A. Hajimiri</category><category>statistics</category><category>shot noise</category><category>1/f noise</category><category>spectral density</category></item><item><title>Shot noise</title><link>https://rf.mokslasplius.lt/shot-noise/</link><description><p>In the last few posts we have looked at <a href="/tag/spectral-density/">spectral | ||
densities</a> of a select <a href="/tag/point-process/">point | ||
processes</a>. In those posts we have represented events | ||
as points on the time axis. Such approach is just an approximation, which is | ||
valid when the duration of events is negligible, but it is not always so. | ||
When the events have finite duration, but the process is otherwise identical | ||
to the Poisson process, we obtain a peculiar type of noise known as the | ||
<a href="/tag/shot-noise/">shot noise</a>.</p> | ||
</description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aleksejus Kononovicius</dc:creator><pubDate>Tue, 21 Nov 2023 08:00:00 +0200</pubDate><guid isPermaLink="false">tag:rf.mokslasplius.lt,2023-11-21:/shot-noise/</guid><category>2023</category><category>Interactive models</category><category>statistics</category><category>Fourier transform</category><category>spectral density</category><category>shot noise</category></item><item><title>Point process with normal inter-event times</title><link>https://rf.mokslasplius.lt/point-process-psd-normal/</link><description><p>I have also attended couple of conferences in the end of October. At | ||
<a href="https://icnf-2023.sciencesconf.org/">International Conference on Noise and | ||
Fluctuations</a> I got asked a question | ||
the gist of which was what would change in my model, if inter-event times | ||
would be normally distributed. I would expect that, in the particular case | ||
I was talking about, little would change, but let us make sure of that. In | ||
this post, we will take a look at point process, and we will revisit a more | ||
complicated topic I talked about later on.</description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aleksejus Kononovicius</dc:creator><pubDate>Tue, 07 Nov 2023 08:00:00 +0200</pubDate><guid isPermaLink="false">tag:rf.mokslasplius.lt,2023-11-07:/point-process-psd-normal/</guid><category>2023</category><category>Interactive models</category><category>statistics</category><category>point process</category><category>spectral density</category></item><item><title>B. Kaulakys: Nobel prize 2021: Laureates and their research</title><link>https://rf.mokslasplius.lt/b-kaulakys-nobel-prize-2021/</link><description><p>A member of our research group gave a talk on Nobel prize awarded in 2021 at | ||
<a href="https://www.ff.vu.lt/lnfk-45">45th Lithuanian National Physics Conference</a>. | ||
Habil. dr. <a href="/tag/b-kaulakys/">B. Kaulakys</a> talked about the research for | ||
which the prize was awarded and how this research relates to works by | ||
Lithuanian physicists (mostly our group) and mathematicians. We invite you | ||
to watch it, but note that the recording is in Lithuanian. The slides, also | ||
in Lithuanian, are available | ||
<a href="https://rf.mokslasplius.lt/uploads/2023/Kaulakys_LNFK-2023.pdf">here</a>.</p> | ||
<div class="embed-responsive embed-responsive-16by9"><iframe class="embed-responsive-item html5-embed html5-embed-youtube" src="https://www.youtube-nocookie.com/embed/tT4I2JVdc0Q" allowfullscreen></iframe></div> | ||
<p>Recording was made by the organizers of the conference. The full recording | ||
of the special session is available on the Facebook page of <a href="https://www.facebook.com/FizikosFakultetasVU">Faculty of | ||
Physics at Vilnius | ||
University</a>. See <a href="https://www.facebook.com/FizikosFakultetasVU/videos/711826120389012">this | ||
post</a>, | ||
if you are interested.</p></description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bronislovas Kaulakys</dc:creator><pubDate>Tue, 31 Oct 2023 08:00:00 +0200</pubDate><guid isPermaLink="false">tag:rf.mokslasplius.lt,2023-10-31:/b-kaulakys-nobel-prize-2021/</guid><category>2023</category><category>video</category><category>B. Kaulakys</category><category>conference</category><category>LNFK</category><category>VU FF</category><category>Nobel prize</category><category>complex systems</category></item><item><title>PSD of a point process with power-law inter-event times</title><link>https://rf.mokslasplius.lt/point-process-psd-power-law/</link><description><p>In <a href="https://rf.mokslasplius.lt/point-process-psd-weibull/">the previous | ||
post</a> we have seen | ||
that introducing memory into the memory-less <a href="/tag/poisson-process/">Poisson | ||
process</a> makes things very complicated. But we | ||
haven't yet still seen <a href="/tag/1f-noise/">1/f noise</a>. So now let us consider | ||
power-law distributed inter-event times!</description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aleksejus Kononovicius</dc:creator><pubDate>Tue, 17 Oct 2023 08:00:00 +0300</pubDate><guid isPermaLink="false">tag:rf.mokslasplius.lt,2023-10-17:/point-process-psd-power-law/</guid><category>2023</category><category>Interactive models</category><category>statistics</category><category>Poisson process</category><category>point process</category><category>Fourier transform</category><category>spectral density</category></item><item><title>Iain Explains: What is power spectral density?</title><link>https://rf.mokslasplius.lt/iain-explains-power-spectral-density/</link><description><p>Over the last few posts we have been talking about the <a href="/tag/spectral-density/">power spectral | ||
density</a> of different random processes. We have used | ||
the fact that it is a modulus of the signal's <a href="/tag/fourier-transform/">Fourier | ||
transform</a> squared. But what is the meaning of the | ||
<a href="/tag/spectral-density/">power spectral density</a>? Watch the video by "<a href="https://www.youtube.com/@iain_explains">Iain | ||
Explains</a>" below for some intuition.</p> | ||
<div class="embed-responsive embed-responsive-16by9"><iframe class="embed-responsive-item html5-embed html5-embed-youtube" src="https://www.youtube-nocookie.com/embed/DoSLMEEo1Y0" allowfullscreen></iframe></div></description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aleksejus Kononovicius</dc:creator><pubDate>Tue, 10 Oct 2023 08:00:00 +0300</pubDate><guid isPermaLink="false">tag:rf.mokslasplius.lt,2023-10-10:/iain-explains-power-spectral-density/</guid><category>2023</category><category>Iain Explains</category><category>video</category><category>statistics</category><category>spectral density</category></item><item><title>PSD of a point process with non-exponential inter-event times</title><link>https://rf.mokslasplius.lt/point-process-psd-weibull/</link><description><p>In <a href="https://rf.mokslasplius.lt/poisson-process-psd/">the previous post</a> we | ||
have seen that the <a href="/tag/poisson-process/">Poisson process</a> generates <a href="/tag/white-noise/">white | ||
noise</a>, which is not unexpected consequence of | ||
exponential distribution being a limit of geometric distribution. So, if we | ||
use non-exponential inter-event time distribution, we introduce memory into | ||
the process. As the distribution of inter-event times is no longer | ||
exponential, we now have not a <a href="/tag/poisson-process/">Poisson process</a>, but | ||
a <a href="/tag/point-process/">point process</a>.</description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aleksejus Kononovicius</dc:creator><pubDate>Tue, 03 Oct 2023 08:00:00 +0300</pubDate><guid isPermaLink="false">tag:rf.mokslasplius.lt,2023-10-03:/point-process-psd-weibull/</guid><category>2023</category><category>Interactive models</category><category>statistics</category><category>Poisson process</category><category>point process</category><category>Fourier transform</category><category>spectral density</category><category>ageing effects</category></item><item><title>PSD of a Poisson process</title><link>https://rf.mokslasplius.lt/poisson-process-psd/</link><description><p><a href="https://rf.mokslasplius.lt/poisson-process/">Earlier</a> we have | ||
started talking about the <a href="/tag/poisson-process/">Poisson processes</a>. In the | ||
few posts before the summer holidays we have driven our discussion towards | ||
<a href="https://rf.mokslasplius.lt/waiting-time-paradox/">waiting time paradox</a>, | ||
which is an interesting phenomenon we encounter in our day-to-day lives. | ||
Here, on Physics of Risk we have an interest in <a href="https://rf.mokslasplius.lt/colors-of-noise/">colors of | ||
noise</a> exhibited by variety of | ||
<a href="/tag/stochastic-models/">stochastic processes</a>. Thus in the next few posts | ||
let us examine the <a href="/tag/spectral-density/">power spectral density</a> of the | ||
Poisson process.</p> | ||
</description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aleksejus Kononovicius</dc:creator><pubDate>Tue, 19 Sep 2023 08:00:00 +0300</pubDate><guid isPermaLink="false">tag:rf.mokslasplius.lt,2023-09-19:/poisson-process-psd/</guid><category>2023</category><category>Interactive models</category><category>statistics</category><category>Poisson process</category><category>Fourier transform</category><category>spectral density</category><category>white noise</category></item></channel></rss> |