NatalĂ­ de Santi

NatalĂ­ de Santi

PhD in Physics

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A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.

Pages

Posts

How to simulate the Universe on a computer

25 minute read

Published:

Hello there! In this post, I will write a bit about cosmological simulations. Yes, it’s a promise-I’ve been meaning to do this since I created this blog, and it’s been a while since my last post.

Pytorch

8 minute read

Published:

Hello there! If you just came to this blog and you would like to learn something about PyTorch I believe you can find something to start playing around. In this post we will see how to write a simple code to solve a simple regression problem. This means we will do predictions for a quantity $y$, given values for their predictor (the input) $x$ for a noised: $y = a x + b$.

Graph Neural Networks

17 minute read

Published:

Have you ever heard about graphs? What about graph neural networks (GNNs)? If you have never paid attention, let’s try to remind you that, structures like the image below are, actually, graphs. And they are filling all the internet.

10 years from my undergraduation in Physics

20 minute read

Published:

In this post I bring a flashback from my undergrad in Physics, because this year (2022) I am completing 10 years from the beginning of this wonderful journey! What is written here is only my personal experience and does not reflect what happens with all the students. First, because I am old (a lot has changed at USP - the university where I did my undergrad - and in the proper major of Physics by there) - and (of course) because it is different, between the different majors.

Schwarzschild Black Holes

7 minute read

Published:

This post is dedicated to the Schwarzschild solution of Einstein’s equations. Here I will follow a simple way to deduce it and show why this solution arises to what we call as the basic kind of black hole: the Schwarzschild Black Holes.

Casimir effect

15 minute read

Published:

In this post you will see what is the bizarre Casimir Effect. I will start telling you about quantum fluctuations, give you some qualitative definition of it and, then, two quantitative descriptions. As I warned you in the previous post (Harmonic Oscillator), the Physics/Mathematics behind of this effect are the quantum harmonic oscillators!

Harmonic Oscillator

14 minute read

Published:

This post is about the basic unit of the Physics, the harmonic oscillator. I start telling you why it is so important in Physics and about the classical version of it. Then, I pass to its quantum version. This “transition” is a good way to see the Correspondence Principle and here I explain why!

A bit of BaTi0.9Zr0.1O3

5 minute read

Published:

In this post you will see a bit about the Barium Titanate (BaTiO3) with the inclusion of zirconium, i.e., the BaTi0.9Zr0.1O3 material. I start with the motivation behind this work and its objectives. Then, I describe the methodology to produce the powders and the pellets, and finalize with the electric characterization of the materials produced.

Superconductivity

7 minute read

Published:

In this post I will summarize what superconductivity is, tell you about some historic aspects, pass through a little of theory (without touching the “mathematics” behind it – because this work was done when I was a teenager) and show to you all the stages of the production of the cuprate YBaCuO pellets and the development of a support, to see the magnetic levitation using them.

portfolio

publications

Mimicking the halo-galaxy connection using machine learning

Published in MNRAS, 2022

First approach: stacked methods and SMOGN

Natalí S. M. de Santi, Natália V. N. Rodrigues, Antonio D. Montero-Dorta, L. Raul Abramo, Beatriz Tucci, M. Celeste Artale, Mimicking the halo–galaxy connection using machine learning, Monthly Notices of the Royal Astronomical Society, Volume 514, Issue 2, August 2022, Pages 2463–2478, https://doi.org/10.1093/mnras/stac1469 https://doi.org/10.1093/mnras/stac1469

High-fidelity reproduction of central galaxy joint distributions with Neural Networks

Published in MNRAS, 2023

Regression to classification solving halo-galaxy scatter problem

Natália V N Rodrigues, Natalí S M de Santi, Antonio D Montero-Dorta, L Raul Abramo, High-fidelity reproduction of central galaxy joint distributions with neural networks, Monthly Notices of the Royal Astronomical Society, Volume 522, Issue 3, July 2023, Pages 3236–3247, https://doi.org/10.1093/mnras/stad1186 https://doi.org/10.1093/mnras/stad1186

talks

Development of a magnetic levitation system

Published:

Poster presentation, XIX Congresso de Iniciação Científica da UFSCar (XIX CIC), Federal University of São Carlos, São Carlos, SP, Brazil

teaching

Tutor Experience

Tutoring, Tutores Educação Multidisciplinar, 2018

Tutoring in Physics, elementary school II level.

Private teacher

Undergraduate revision lectures, Flexus Educacional LTDA-ME, 2018

Review of the discipline LE201 - General Physics I, of the University of Campinas (UNICAMP), campus of Limeira.

Teaching Assistant of Basic Physics III

Teaching Assistant, University of SĂŁo Paulo (USP), 2020

I helped undergrad engineering students with problems, concepts and theory related to Eletromagnetism.

Teaching Assistant of Classical Electrodynamics I

Teaching Assistant, University of SĂŁo Paulo (USP), 2021

I helped graduated physics students with problems, concepts and theory related to Classical Electrodynamics I. Besides, together with the professor, we proposed the problem sets and I solved and made available the solution of them to the students.