Public Articles
Alberto Pepe
Alberto Pepe is the co-founder of Authorea. He is also an Associate Research Scientist at Harvard University where he recently finished a Postdoctorate in Astrophysics. During his postdoctorate, Alberto was also a fellow of the Berkman Center for Internet and Society and the Institute for Quantitative Social Science. Alberto is the author of 30 publications in the fields of Information Science, Data Science, Computational Social Science, and Astrophysics. He obtained his Ph.D. in Information Science from the University of California, Los Angeles with a dissertation on scientific collaboration networks which was awarded with the Best Dissertation Award by the American Society for Information Science and Technology (ASIS&T). Prior to starting his Ph.D., Alberto worked in the Information Technology Department of CERN, in Geneva, Switzerland, where he worked on data repository software and also promoted Open Access among particle physicists. Alberto holds a M.Sc. in Computer Science and a B.Sc. in Astrophysics, both from University College London, U.K. Alberto was born and raised in the wine-making town of Manduria, in Puglia, Southern Italy.
Email: [email protected]
Twitter: @albertopepe
Authorea and the Thirty Meter Telescope
and 5 collaborators
Hello, welcome to Authorea!
My name is Alberto and I wrote this short document to get you acquainted with Authorea. I am an Astronomerand Computer Scientist by training (I was a Postdoc at the Harvard’s Center for Astrophysics until 1 year ago) and with the help of some colleagues, I created Authorea - a collaborative writing platform for science.
I received today a request for using Authorea for documents porduced by the Thirty Meter Telescope Time-domain science definition team. You should have received an email notification to open this article. How does it work? Double click anywhere on the text to start writing. In addition to simple text you can also add text formatted in boldface, italic, and yes, math in LaTeX too: E = mc2! Add images by drag’n’drop or click on the “Insert Figure” button.
Sensitivity of vertical seismic profiling for monitoring CO\(_2\) storage in a low porosity reservoir – An example from the St-Lawrence Lowlands, Canada
and 3 collaborators
We have performed a series of rock physics measurements under various simulate confining and pore pressure and temperature states to test the seismic response of two tight reservoir samples of the sedimentary basin of the St. Lawrence Lowlands to different CO2 phases. Results show that the seismic velocity and amplitude can be used to detect the CO2 phase transition. Laboratory measurements were used to calibrate a stochastic geological model that was used to generate synthetic seimograms reproducing the response to CO2 injection in the reservoir formations. The modeled CO2 injection scenario included 15 years of injection followed by 35 years of CO2 migration. Synthetic time-lapse seismograms were produced after 5, 15 and 50 years form the start of injection. Results show that substitution of brine by CO2 is responsible of a time-delay in the seismic traces despite very low reservoir permeabilities and porosities. A comparison between a classical blocky model and our stochastic model shows that the blocky model leads to a misinterpretation of the CO2 effect on the seismic response.
Keywords: CO2, ultrasonic measurements, seismic modeling, time-lapse VSP, low porosity sandstones, CO2 injection modeling
Your Paper is Now Ready on Arrival
and 1 collaborator
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FPGA Lab 10
Frontiers template
Leave the Abstract empty if your article falls under any of the following categories: Editorial Book Review, Commentary, Field Grand Challenge, Opinion or specialty Grand Challenge. As a primary goal, the abstract should render the general significance and conceptual advance of the work clearly accessible to a broad readership. References should not be cited in the abstract. Refer to http://www.frontiersin.org/ or Table [Tab:01] for abstract requirement and length according to article type.
Keywords: Text Text Text Text Text Text Text Text. All article types: you may provide up to 8 keywords; at least 5 are mandatory.
Relatório parcial de pesquisa
and 3 collaborators
Ferramentas do Detetive Ecológico: uso e avaliação de modelos com detecção imperfeita
Paulo Inácio de Knegt López de Prado
Instituto de Biociências, Universidade de São Paulo
Carlos Ernesto Candia-Gallardo, Pós-graduação em Ecologia IB–USP
Gregório Menezes, consultor autônomo
Gustavo Mattos Accacio, consultor autônomo
Leonardo Liberali Wedekin, Pós-doutorado IB–USP
Rodolpho Credo Rodrigues, Pós-graduação em Ecologia IB–USP
Karlla Barbosa dos Santos, Bolsista TT-III FAPESP
Melina de Souza Leite, Especialista em Laboratório, IB–USP
2013/19250-7 Auxílio Pesquisa - Regular
01/02/2014 a 31/01/2016
01/02/2014 a 30/01/2015
FPGA Lab 9
Lab 9 introduced the use of memory in order to use the data in a text file to run an audio player. I was able to compile the provided circuit and send an audio file over the serial port to the FPGA which played the song. This lab was very useful in demonstrating the use of on board memory in the context of file i/o which is an extremely useful part of any digital circuit that does not do a specific task or needs to access data that is store on an external device like a hard drive.
FPGA Lab 8
FPGA Lab 7
Authorea & Sumit Proposal
and 2 collaborators
#Introduction
FPGA Lab 6
FPGA Lab 5
Lab 5 instructed us to design a stopwatch using the supplied FPGAs. The circuit needed to be able to increment every tenth of a second and track the number of minutes and hours that had passed. While I was instructed to make a three-state machine that is driven by one button that causes the timer to stop/stop/reset in that order. However, I implemented a two-state system and attached the reset functionality to a second button in order to reflect the design of stopwatches that I had encountered. This lab was very useful in demonstrating the steps that are involved when creating a complete circuit. This included designing state machines as well as importing modules previously defined as external libraries which are extremely common when designing circuits.
FPGA Lab 3
Part 1 of this lab involved the implementation of a simple counter using a Quartus Megafunction. After hooking up the counter to the FPGA’s onboard clock, I tested that the counter worked as intended. Then, using Quartus’s simulation features, I was able to look at the individual logic states of the parts of my logic both by tying the line to an output line on the board as well as using registers which were able to provide byte level inspection at any location on the board. Using an iPhone, I was able to record the clock as it incremented. In the 10 seconds I recorded the counter, it incremented 1.99 × 109 times which gives the clock a period of
$\frac{10}{1.9\times10^9} = 50.25 MHz$
Which is pretty close to the 50 MHz that is expected by the FPGA.
After timing the clock, I simulated its performance using the Quartus simulator and verified that the counter incrememented to the right value at the right time.
The 2nd part of the lab involved the creation of a binary-coded decimal counter which was made out of 5 up counters with a modulus of 10 as described in Section 2.2. In order to drive the system every hundredth of a second, I connected the FPGA’s CLOCK_50 to a modulus 500000 counter whose cout went high at the desired frequency.
Part 3 of the lab involved the creation of a 4 bit counter from elementary gates and a D flop. I did use a Quartus megafunction in order to create a modulus counter that would drive the system every second. In constructing this diagram, I needed to create a 1 bit adder without a carry-in (done with an xor and and) 1 bit multiplexer (created with an inverter) which acts as the carry-in for the counter as a whole.
Happy Valentine's Day!
and 1 collaborator
Words are important.
They convey our thoughts,
our ideas, our intuitions.
Passion, love, discovery,
they all materialize from words
emerging from the inner workings of our minds.
And when we write,
when we fill with words the empty canvas in front of us,
sometimes those intuitions, those feelings,
those beautiful bundles of thoughts,
they suddenly become clearer.
All of the sudden we really understand.
The writers. The readers. The lovers.
To Love, passion, discovery. To words.
Happy Writing,
- Matteo and The Authorea Team
FPGA Lab 4
FPGA Lab 1 and 2
These labs covered the basics of implementing digital circuitry using a field-programmable gate array (FPGA). We reviewed how one builds the program in Quartus and compiles it onto the FPGA. We also reviewed how one can constructs complex circuits very easily in Quartus and show the result using a 7-segment display. This lab was very helpful in providing the necessary building blocks for future projects involving FPGAs as it showed how one can encode the necessary logic to execute a desired task.
Planes toy models
The standard picture of the evolution of substructure in the Universe involves the collapse of dark matter into halos, which may host luminous galaxy. Such halos may exist within the bounds of larger halos; in these cases the galaxies they may host are typically called satellite galaxies, and their evolution differs substantially from galaxies that are not satellites in ways not fully understood. Analysis of the spatial and kinematic distributions of such galaxies can inform our ideas of how satellites and the systems in which they are found evolve. Substantial evidence exists that satellite galaxies are not isotropically distributed around their hosts. \cite{West2000,Bailin_2008}. This is also seen in simulations; subhaloes of hosts typically are typically distributed anisotropiclly in both position and velocity space \cite{VDB99,Knebe,Zentner_2005,Faltenbacher_2010}.
Local group satellites are highly anisotropically distributed both around the Milky Way and M31. The disk-like arrangement of MW satellites was first pointed out by \citet{Lynden-Bell74}. Later studies argued further for the existence of a disk-like structure of Milky Way satellites \cite{Metz07,Metz09}, and argued that the MW satellite disk was rotationally supported \cite{Metz08}. \citet{Kroupa_2005} further argues that the distribution of satellite galaxies around the MW is not predicted by LCDM. Around M31, dramatic evidence has been found for a disk of satellites, many of which exhibit coherent rotation along the line of sight \cite{Ibata_2013}. The M31 structure seems particularly difficult to square with our picture of galaxy evolution; \cite{Ibata_2014} argues that \cite{Ibata_2014} that alignments similar to the one found around M31 are essentially non-existant in numerical simulations.
Much recent work has gone into investigating the possibility of similar satellite distributions around galaxies outside of the local group. Recently, work by \citet{Ibata_2014} (hereafter I14) pointed to the possibility of corotation seen in diametrically opposed satellite pairs in Sloan Digital Sky Survey (SDSS), finding 20 out of 22 oppositely aligned satellite pairs corotating along the line of sight. This result was contested by \citet{Cautun14}, arguing that the results of \citet{Ibata_2014} are strongly dependant on selection criteria and are not robust. The original authors then claimed that less-massive satellites than originally considered exhibit a spacial over-density consistent with the claimed existence of co-rotating sturctures frequently seen in SDSS \cite{2014arXiv1411.3718I}. Still, the consensus on the prevelence of co-rotating satellite disks in the non-local Universe is unclear.
In this paper we examine kinematic evidence for the existence of rotating planes. We compare the kinematic results we obtain from selection criteria modelled after that of I14 to simple numerical models of satellite behavior. The structure of the paper is as follows: In Section [sec:data] we discuss the selection of the observational sample and the presense of the co-rotation signal. In Section [sec:models] we introduce our numerical models and compare the mock observations derived from the models to the true observational data. In Section [sec:discuss] we discuss our results in the context of the search for M31-like planes elsewhere in the Universe. Throughout our analysis, we employ a Λ cold dark matter (ΛCDM) cosmology with WMAP7+BAO+H0 parameters ΩΛ = 0.73, Ωm = 0.27, and h = 0.70 \cite{Komatsu_2011}, and unless otherwise noted all logarithms are base 10.
Properties of Thiotimoline
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