Jazz fusion by Ciro Santilli 35 Updated +Created
Ciro's 2020 perfect Friday evening: jazz fusion + study quantum field theory on an Amazon Kindle. Ahhhhhh.
Music by Ciro Santilli 35 Updated +Created
Ciro Santilli took courses once upon a time, maybe that has influenced his passion? Ciro Santilli's musical education.
ourbigbook.com by Ciro Santilli 35 Updated +Created
I had meant to make an update earlier, but I wanted to try and add some more "visible end-user changes" to OurBigBook.com.
Just noticed BTW that signup on the website is broken. Facepalm. Not that it matters much since it is not very useful in the current state, but still. Going to fix that soon. EDIT: nevermind, it wasn't broken, I just had JavaScript disabled on that website with an extension to test if pages are visible without JavaScript, and yes, they are perfectly visible, you can't tell the difference! But you can't login without JavaScript either!
I still haven't the user visible ones I wanted, but I've hit major milestones, and it feels like time for an update.
I have now finished all the OurBigBook CLI features that I wanted for 1.0, all of which will be automatically reused in ourbigbook.com.
A secondary but also important advance was: further improvements to the website's base technology.
I knew I was going to do them for several months now, and I knew they were going to hurt, and they did, but I did them.
These change caused two big bugs that I will solve next, one them infinite recursion in the database recursive query, but they shouldn't be too hard.
ourbigbook.com by Ciro Santilli 35 Updated +Created
Not work by Ciro Santilli 35 Updated +Created
I was trying to learn about how some types of quantum computers work, when I came across this pearl:
en.wikipedia.org/wiki/Wolfgang_Paul#Scientific_results Wolfgang Paul, 1989 Nobel Prize in Physics winner, referred to Wolfgang Pauli, 1945 winner, as his "imaginary part".
A linear map is a (1,1) tensor by Ciro Santilli 35 Updated +Created
A linear map can be seen as a (1,1) tensor because:
is a number, . is a dual vector, and W is a vector. Furthermoe, is linear in both and . All of this makes fullfill the definition of a (1,1) tensor.
Roasted nuts by Ciro Santilli 35 Updated +Created
All with olive oil and salt mixed up before roasting.
2021-04-05 180C:
  • chestnuts: 1.5x 200g: 3x 6min, this was a bit too much
  • hazelnuts: 1.5x 200g: 3x 6min, seemed fine
  • pecans: 4.5x 200g bags: 5x 6 min, a bit uneven roast because too much on tray
2021-02-06 180C:
  • almonds: 2x 200g: 3x 6min, slighted burnt taste
  • Brazil nuts: 2x 300g: 3x 6min + 3min
  • chestnuts: 1x 400g: 3x 6min, perfect
  • pecans: 3x 200g bags (previously had done just 2 bags at a time): 3x 6 min + 2x 3min, perfect
2021-01-04:
  • almonds: 190C, 8 min, they started burning on top! What? I put olive oil abundantly this time. 170C 5 min
  • chestnuts: 180C, 6 min, stir, 6 min, stir, 4 min, they became very good, dark brown
  • pecans: 180C, 6 min, stir, 6 min, stir, 3 min while preparing chestnuts, very good
2020-11-21:
  • mixed nuts: 180C, 10 minutes, did not reach the point. Then 7 more minutes on 190C: pecans completely burned out
  • almonds: 190C, about 25 minutes, opened several times, in the end had a slight burnt taste, but did not get black, just darker brown. Not as crispy as the ones we buy roasted, but pretty good
  • pecans: 180C, 13 minutes, opened 3 times to stir, became great
Backpacks by Ciro Santilli 35 Updated +Created
2024-04: got two backpacks "for free" with the Lenovo reward points from buying the Lenovo ThinkPad P14s gen4 amd, not bad, that was already cheap and now I got some extra swag:
The sport backpack has a fatal flaw: no strap to hold laptop in place, wo it just tumbles back and forth as you walk.
Neither of them have very good padding below the laptop, but at least the Elite one has a slightly elevated inner bag which woudl likely help a lot in case of a drop.
Skullcandy Smokin' Buds 2 by Ciro Santilli 35 Updated +Created
Skullcandy earphones, first one circa. 2016 most likely. Used them a lot, these are good.
2023-07: one of the sides broke near center, rebuying.
2021-07: wire half broke near connector, only works in some positions. The funny thing is: only voices seem to be blocked out! Rebuying.
2021-06: a small bottom piece of the left earpiece broke. Wire seems find, that is like a little extension to protect wire. Let's see for how long.
2020-20: wires at one of ears broke, not sure how.
Tech specs:
Weight: 4g
Connection Type: 3.5mm AUX Cable
Impedence: 32 ohms
Driver Diameter: 9mm
THD: <0.1% (1mW/500Hz) (0.0234)
Sound Pressure Level: 95 dB (1mW/500Hz)
Frequency Response: 20kHz - 20Hz
Headphone Type: In-Ear
WD10EADS-42P6B0 by Ciro Santilli 35 Updated +Created
~1TB.
Has a separate power cord, not USB powered. Unbelievable. Edit: actually high ends are still like that as of 2023, e.g. at that time, a the max non-cabled was 5 TB, but top of line was 20 TB.
Disk label: wd1t.
Ubuntu 20.04 gnome-disks benchmark, ext4 partition: 37MB/s.
WD Elements 20TB by Ciro Santilli 35 Updated +Created
Bought December 2023 for 300 pounds, so 15 pounds / TB. Needs power supply unfrotunately besides USB, the largest one without needing power supply was only 5 TB at the time so not worth it, given that my P14s alreay carriers 2 TB. 10x is a must for the external crap.
Noise: it has a constant pleasant hum, with a not so nice click every 5 seconds or so. Reasonable, but not amazingly incredible.
The size is reasonable, not megaportable, but definitely reasonable.
Internet speed by Ciro Santilli 35 Updated +Created
Home 2017 TalkTalk 38Mbps nominal, Google M-lab speed test:
  • 36.4 Mbps download
  • 9.15 Mbps up
  • 58 ms latency over 80km of first world
Phillips D400 cordless phone by Ciro Santilli 35 Updated +Created
Takes two AAA rechargeable batteries.
2021-08: rechargeable battery charges were in, nominal marked 1.2V nickel metal hydride, measured as 1.38V and 1.42V.
Google Pixel 7a by Ciro Santilli 35 Updated +Created
Google Pixel 3a (2020) by Ciro Santilli 35 Updated +Created
Bought: January 2020 from store.google.com/ for 350 pounds.
Front camera video on Android 11: about 100MiB / minute. The encoding is however super inefficient, a FFmpeg re-encode without any options reduces it by 1/3.
For Fastboot mode: Power and Volume down simultaneously for 10-15s. It is OK if screen sleeps. On "no command", power then volume up to see options.
2023-10: touchscreen not registering touches anymore. Still displays images. Manage to regain access with wired USB mouse + a simple USB-C adapter. RIP. Will attempt replacement: store.ifixit.co.uk/products/google-pixel-3a-screen-genuine?variant=42388954448071, partly to get Authy access which I had never properly tested... Replaced screen, but at exact same status as before: shows image but no touch. thus I wasted my money and time (minus the learning) something else is broken.
Nokia G22 (2023) by Ciro Santilli 35 Updated +Created
£112.99
Buying October 2023 as an immediate backup phone after the Google Pixel 3a (2020) touchscreen died, and Motorola Moto G6 Play (2018) wouldn't connect to giffgaff.
Still working checks: May 2024.
Toilet mirror lamps by Ciro Santilli 35 Updated +Created
When I came, two Bell GU4 (MR11) 20W 12v.
One burnt. Put in an ASDA halogen one.
ASDA burnt, put in TopLux on right, old Bell left.
2019-01-24, right one burnt a few days ago, old Bell still works. Inner part black, and black dot on the wire. Putting new TopLux again, but this time on the left, old bell on right.
2019-01-24 toilet top lamp also burnt a few days ago, but not at the same time as mirror. Diall, 240V 40W, GU10. Putting in IKEA 240V 35W.
2019-02-02 toilet mirror lamp left (TopLux) burnt. Don't know what to do anymore. Only the magic Bell lamp works.
2019-03-06 toilet top lamp left burnt, IKEA 240V 35W GU10. Putting in another one.
2019-03-28 toilet top lamp right burnt, IKEA 240V 35W GU10. Waiting for people to come to look at transformer, there is definitely something wrong.
2019-04-03 top lamps: replaced with LED (LAP GU10 3W) since lower power, transformer not changed. Mirror lamps: transformer changed, left one replaced with Homebase Halogen 20W 12V. When I came back lamps flickering badly and sometimes not turning on, recalled technician.
2019-04-12 mirror lamp: it was just he connector that was bad, it was changed, also put LEDs there to make it less warm and hopefully have less tear on connector.
Fridge by Ciro Santilli 35 Updated +Created
Brand according to documents: SMEG.
Most similar models I an find: www.smeguk.com/products/UKC8173N1F and www.smeguk.com/products/UKC81721F, the keyword are "built-in" and "integrated", other very similar ones: www.smeguk.com/refrigerators/built-in
Looks like this: www.youtube.com/watch?v=4c_LBVnU4ec and that's how to unclog the drain.
2020-11-28: defrost. Some small Styrofoam was broken lose from top, noticed small burn or rust marks on top grid nearby.
Pinned article: ourbigbook/introduction-to-the-ourbigbook-project
Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
Video 1.
Intro to OurBigBook
. Source.
We have two killer features:
  1. topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculus
    Articles of different users are sorted by upvote within each article page. This feature is a bit like:
    • a Wikipedia where each user can have their own version of each article
    • a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
    This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
    Figure 1.
    Screenshot of the "Derivative" topic page
    . View it live at: ourbigbook.com/go/topic/derivative
    Video 2.
    OurBigBook Web topics demo
    . Source.
  2. local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:
    • to OurBigBook.com to get awesome multi-user features like topics and likes
    • as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
    This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
    Figure 5. . You can also edit articles on the Web editor without installing anything locally.
    Video 3.
    Edit locally and publish demo
    . Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.
    Video 4.
    OurBigBook Visual Studio Code extension editing and navigation demo
    . Source.
  3. https://raw.githubusercontent.com/ourbigbook/ourbigbook-media/master/feature/x/hilbert-space-arrow.png
  4. Infinitely deep tables of contents:
    Figure 6.
    Dynamic article tree with infinitely deep table of contents
    .
    Descendant pages can also show up as toplevel e.g.: ourbigbook.com/cirosantilli/chordate-subclade
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact